Detailed introduction：application scenarios and construction methods of tunnel waterproofing board laying trolley

As a key equipment for mechanized construction of modern tunnel engineering, the application scenarios of the tunnel waterproofing board laying trolley have been expanded from traditional mountain tunnels to complex working conditions such as urban subways and submarine tunnels. Based on engineering practice, this article systematically sorts out the application scenarios and construction methods of the tunnel waterproofing board laying trolley to help the construction party accurately select the model.

Application scenarios and construction methods of tunnel waterproofing board laying trolley：

1. Tunnel scenario:

Mountain tunnel: it is a typical application scenario for the tunnel waterproofing board laying trolley. The trolley should meet the hydraulic telescopic arm span ≥ 18m, cover the full section in one-time molding, be equipped with a laser positioning system, and adapt to the configuration of 0.5%-3% longitudinal slope.

Urban subway tunnel: due to its special working conditions (small space and need to avoid pipe segment bolts, etc.), the tunnel waterproofing board laying trolley should adopt a compact design, equipped with a 360° rotating mechanical arm and use a magnetic fixing device to avoid pipe segment connectors. Using a tunnel waterproofing board laying trolley can increase efficiency by 300% compared to manual laying.

Subsea tunnel: subsea tunnels pose extremely high challenges to the tunnel waterproofing board laying trolley waterproofing board, so it is necessary to upgrade the trolley. To make the tension of the waterproof board ≥200N/m, the hot melt welding machine manipulator must be integrated, and the welding temperature accuracy must be ±3℃. Construction can only be carried out after acceptance, and the acceptance must meet the airtightness test of 0.3MPa pressure maintenance for 30 minutes without leakage.

tunnel waterproofing board laying trolley

2. Geological conditions:

Weak surrounding rock section: the trolley must be modified due to the large fluctuation difference: the multi-degree-of-freedom manipulator adjustment system ±5mm and a flexible buffer layer is added to the trolley.

Rock burst high-risk section: the construction site is highly dangerous, and the trolley must be strengthened for safety: an anti-rockfall steel grille is installed on the top of the trolley. Remote control operation mode is adopted, and personnel are evacuated to a safe distance for operation.

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More detailed information about the application scenarios and construction methods of tunnel waterproofing board laying trolley can be found by visiting:https://www.gf-bridge-tunnel.com/a/blog/application-scenarios-and-construction-methods-of-tunnel-waterproofing-board-laying-trolley.html

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The benefits of steel structures to agriculture: cost reduction, efficiency improvement and the cornerstone of future agriculture

In the transformation and upgrading of modern agriculture, steel structures are reshaping the form of agricultural buildings with their high strength, modularity and sustainability. From smart greenhouses to 10,000-ton granaries, from intensive farms to agricultural product processing centers, steel structures have become the preferred solution for modern agricultural infrastructure. This article will deeply analyze the core advantages of agricultural steel structures, analyze the benefits of steel structures to agriculture, and attach specific scenarios.

Benefits of steel structures for agriculture:

1. Super strong bearing capacity:

Agricultural steel structures rely on their wind pressure resistance level: can withstand 12-level typhoons, snow load resistance: the slope roof design can bear 1.5m of snow, and seismic performance: the flexible node design can meet 8-degree seismic fortification. These three technical characteristics enable it to cope with the challenges of extreme environments.

2. Fast assembly:

Compared with the time-consuming traditional brick-concrete construction, the steel structure construction takes only half the time, which greatly optimizes the construction process. Shortened the construction period by 50%.

3. Innovation in space utilization:

Steel structures can achieve large-span column-free space, with a single span of up to 60 meters, meeting the needs of mechanized operations. And it is suitable for lightweight rock wool sandwich panels (thickness 50-150mm) to achieve rapid zoning, adapt to crop rotation and multi-species mixed breeding. It breaks through the limitations of traditional agriculture.

agricultural steel structures

4. Significant cost reduction:

In terms of material cost, the steel structure solution saves about 15.5% of the cost compared with the concrete solution. From the perspective of construction cost, it saves about 52% of the cost. While the annual maintenance cost is greatly reduced, the steel structure also far exceeds the concrete in terms of service life. Thus, the purpose of reducing costs from multiple angles is achieved.

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More detailed information about the steel structures to agriculture can be found by visiting:https://www.meichensteel.com/a/news/benefits-of-steel-structures-for-agriculture.html

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Common failures and solutions of slewing bearings

Slewing bearing as a common mechanical parts in the current industrial machinery, because it has good performance advantages to improve the efficiency of industrial production is widely used. So in the long-term use of the process will inevitably appear a lot of faults, the following is a summary of common failure phenomena, cause analysis and solutions:

Common failures and solutions of slewing bearings:

1. Rattling:

Mainly manifested in the rotation of the “thump” sound or continuous friction sound, metal impact sound. The reason for the noise may swim raceway surface wear, insufficient lubrication leading to dry friction, cage fracture, rolling body collision, excessive clearance leading to shock vibration. The solution needs to be disassembled and inspected first to ensure that the condition of the rolling body. Re-lubrication optimization to avoid dry friction. Adjust the clearance (0.05~0.15mm). If the cage is broken to replace the cage.

Slewing bearing

2. Rotating stall:

The main manifestation of the equipment rotary inflexible with obvious obstacles or motor overload alarm. Usually the reasons are mounting surface flatness > 0.2mm / m, raceway into the foreign body, rotating parts were extruded, negative clearance set wrong. The solution needs to repair the mounting surface first, and then clean and seal upgrades after recalibration of the negative clearance.

3. Grease leakage:

Mainly manifested in the seal out of grease oozing. The causes of this problem are usually worn seals, grease oxidization at high temperatures after thinning, equipment tilt angle is too large. The solution is to modify the sealing system and replace the grease while optimizing the grease injection cycle.

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More detailed information about the common failures and solutions of slewing bearings can be found by visiting: https://www.mcslewingbearings.com/a/news/common-failures-and-solutions-of-slewing-bearings.html

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Flat and Bended Glass Tempering Furnace Installation Guide

Flat and bent glass tempering furnace is the core equipment for producing building curved curtain walls and automotive curved glass. Its installation accuracy directly affects the yield rate and equipment life. This article provides the installation process of flat and curved glass tempering furnace, covering the entire process of foundation construction, mechanical positioning, and electrical debugging, helping you avoid 90% of installation risks.

Installation process of flat and bent glass tempering furnace：

1. Preparation before installation:

Site foundation construction: concrete bearing grade must be ≥5 tons/m² (including equipment weight + glass load), thickness: ≥400mm. 1.5m maintenance space is reserved at the top of the furnace body, and the ambient temperature must be controlled at 15-35℃ (to avoid thermal expansion and contraction causing structural deformation).

2. Mechanical installation steps:

Furnace body and wind grille positioning: use a 20-ton crane, and the hanging point must be at the location of the equipment reinforcement ribs. Pay attention to the application of high-temperature resistant sealant at the flange interface when splicing the segmented furnace body. Use a laser level to monitor the entire process during positioning, the longitudinal level is ≤0.5mm/m, and after the roller is installed, use a feeler gauge to check the parallelism between the rollers.

Installation of ceramic roller system: clean the bearing seat first, apply molybdenum disulfide high-temperature grease, and then install the ceramic rollers one by one. The bearing clearance at both ends is controlled at 0.05-0.1mm, and the centering deviation of the drive motor coupling is ≤0.05mm. After the installation is completed, the transmission test is carried out. Under no-load operation for 2 hours, the radial runout of the roller is ≤0.15mm.

Cooling wind grid debugging: the angle between the wind nozzle and the glass surface is 35°-50°, and the angle gauge is used for precise positioning, and the wind pressure is balanced to ensure that the upper and lower wind pressure difference is ≤5%.

flat and bent glass tempering furnace

3. Electrical and program debugging:

Power supply system configuration: the power supply must meet the three-phase 380V±5%, and the independent grounding resistance is ≤4Ω, and the cable cross-sectional area is ≥120mm².

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More detailed information about the installation process of flat and bent glass tempering furnace can be found by visiting:https://www.shencglass.com/en/a/news/installation-process-of-flat-and-bent-glass-tempering-furnace.html

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System Analysis HB55 Series Vibrating Screen Exciter

As the core power source of the vibrating screen, the HB55 series vibrating screen exciter is widely used in material screening scenarios in mining, metallurgy, coal and other industries. It is known for its high excitation force output and long life design, but in actual use, precise maintenance is required to ensure the stability of the equipment. This article will systematically analyze this series of vibrators:

Analysis of HB55 series vibrating screen exciter:

1. Structure and working principle:

The core components include eccentric blocks (adjustable mass), bearings, drive shafts, housings and sealing devices. When the eccentric block rotates, centrifugal force is generated to form directional vibration. Drive mode: usually driven by a motor through a coupling or a V-belt, the speed is synchronized with the motor, and the excitation force can be adjusted by adjusting the eccentric block angle or counterweight. Balanced design: a dual-axis structure or a symmetrical eccentric block layout may be used to offset the lateral force and reduce the impact of equipment vibration on the supporting structure.

2. Typical technical parameters:

Excitation force range: about 10-50kN (customizable), to meet different screening intensity requirements. Speed: usually matched with a 4/6-pole motor, ranging from 900-1500rpm. Bearing model: heavy-duty roller bearing (such as SKF 223 series), with high load capacity. Power matching: suitable for motor power 5.5-30kW, depending on the model. Protection level: IP65 or above seal, dustproof and waterproof, adaptable to harsh working conditions.

3. Application scenarios:

Mainly suitable for large-volume, medium-coarse particle materials (such as ore, sand and gravel), and high-frequency versions can also be customized for fine powder screening such as mining (coal, metal ore screening), building materials (sand and gravel classification), chemical industry (powder screening), metallurgy (coke separation) and environmental protection (sludge dehydration) industries

HB55 series vibrating screen exciter

4. Performance advantages:

High efficiency and durability: optimize the bearing seat structure to extend the bearing life; modular design facilitates the rapid replacement of wear parts. Convenient maintenance: external lubrication channel, support non-stop grease filling; eccentric block calibration scale, simplify the adjustment process. Compatibility: adapt to a variety of screen box structures (linear, circular vibrating screen), support variable frequency control to achieve stepless frequency modulation.

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More detailed information about the HB55 series vibrating screen exciter can be found by visiting:https://www.zexciter.com/en/a/news/analysis-of-hb55-series-vibrating-screen-exciter.html

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Starting from the advantage of gantry welding machine : why is the gantry welding machine the first choice for welding large workpieces?

Gantry welding machine dominate the field of large-scale workpiece welding such as shipbuilding, engineering machinery, and bridge steel structures due to their high stability, wide coverage, and intelligent control system. This article deeply analyzes the advantages of gantry welding machines and provides professional reference for enterprise equipment selection.

1. Ultra-large workpiece welding capacity: the horizontal span can reach 3-20 meters, and the maximum longitudinal stroke is 50 meters, which is suitable for ultra-long parts such as wind turbine towers and ship sections. X/Y/Z three-axis precision movement, with a ±180° rotating table, can achieve full coverage of three-dimensional welds, and the static load-bearing capacity is up to 200 tons (heavy-duty model), which meets the welding needs of heavy workpieces such as pressure vessels and shield machine shells. Compared with cantilever welding machines, the rigidity of the gantry structure is increased by more than 60%, which greatly reduces the welding deformation caused by workpiece vibration.

2. Industry-leading welding accuracy and consistency: repeated positioning accuracy of ±0.05mm, ensuring that the straightness error of long welds (>10 meters) is ≤1mm/meter, supporting laser tracking or arc sensing real-time correction, and adapting to groove deviation. At the same time, the gantry welding machine can be equipped with 2-4 welding guns for synchronous welding, which increases efficiency by 300%. Each welding gun has independent parameter control (current 200-600A adjustable), which meets the requirements of multi-layer and multi-pass welding process.

gantry welding machine

3. Fully automated production: the gantry welding machine can realize one-click programming: import CAD drawings to automatically generate welding paths, reduce manual teaching time, support offline programming, and increase equipment utilization by 40%. It also has an adaptive process library that can store more than 500 sets of welding parameters (such as MAG welding, submerged arc welding, narrow gap welding), and automatically match material thickness (6-150mm)

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More detailed information about the advantage of gantry welding machine can be found by visiting:https://www.bota-weld.com/en/a/news/advantages-of-gantry-welding-machine.html

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Detailed analysis of the advantages of double-shaft mixers from the perspective of structure, process and core technology

The double-shaft mixer (also known as the twin-shaft mixer) is the core equipment for efficient mixing of powder, granules and viscous materials in the building materials, chemical, metallurgical and environmental protection industries. With its bidirectional stirring force and uniform mixing effect, it has become an irreplaceable key link in the production line. This article will analyze the advantages of the twin-shaft mixer in depth.

Advantages of double-shaft mixers:

1. Advantages of the core structure of the double-shaft mixers:

The main components include: twin stirring shaft system, transmission device, mixing tank body and unloading system. These precision structures jointly determine the good performance of the twin-shaft mixer.

2. Working principle of the double-shaft mixers and material movement analysis:

The twin shafts are driven by the reducer and rotate synchronously in opposite directions, driving the mixing blades to exert shear force, convection force and diffusion force on the materials, forming a three-dimensional composite movement. Material mixing process: feeding stage: the material is put in from the top feed port and evenly distributed at the bottom of the tank body. Shear dispersion: the counter-rotating blades push the material to the middle of the tank body to form a high-density interaction area. The relative speed difference between the blades and the material produces strong shear to break the agglomeration. Convection circulation: the outer blades push the material to move along the axial direction, and the inner blades throw the material in the opposite direction, forming an “8”-shaped circulation trajectory to improve the mixing uniformity (up to more than 95%). Discharging stage: after the bottom gate is opened, the blades continue to rotate to empty the mixture without residue.

double-shaft mixer

3. Five technical advantages of the double-shaft mixers:

Efficient mixing ability: the reverse rotation of the double shafts causes the material to produce strong convection in both the radial and axial directions, and the mixing efficiency is increased by more than 40% compared with the single-shaft model.

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More detailed information about the advantages of double-shaft mixers can be found by visiting:https://www.zymining.com/en/a/news/advantages-of-double-shaft-mixers.html

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Common faults and quick solutions of horizontal vibrating screen

As the core screening equipment in the mining, chemical, building materials and other industries, the stable operation of the horizontal vibrating screen directly affects the production efficiency. However, long-term high-intensity operation may cause equipment failure. This article summarizes the common faults of the horizontal vibrating screen and its professional solutions to help users quickly troubleshoot hidden dangers and reduce downtime losses:

Common faults and solutions of horizontal vibrating screen：

1. The equipment cannot start normally or suddenly shuts down:

The reasons for this problem include poor contact of the power line or unstable voltage, motor overload triggering protection, and vibration exciter bearing stuck. The solution is to check the power connection and test the voltage stability (it is recommended to be equipped with a voltage stabilizer), clean the material blocking the screen surface, reduce the motor load, disassemble the vibration exciter, and clean or replace the damaged bearing.

2. The screening efficiency is significantly reduced:

The key reasons for this problem are that the mesh size of the screen does not match the particle size of the material, the angle deviation of the vibration motor eccentric block (ideal angle: 45°~90°), and the insufficient tension of the screen surface leads to local relaxation. To solve this problem, you can replace the polyurethane screen with a suitable mesh size according to the material characteristics, adjust the eccentric blocks on both sides to the same angle (synchronous and symmetrical adjustment is recommended) or use professional tools to re-tighten the screen to ensure uniform force.

Arc Vibrating Screen

3. Abnormal noise occurs when the equipment is running:

Common reasons include loose bolts causing component collisions, lack of oil in the bearings or aging of seals, or the screen is damaged and hits the support beam. The specific maintenance process is to fully tighten all bolts after shutdown (the torque must meet the equipment manual standard), add high-temperature lithium-based grease to the bearings (replenish once every 500 hours), immediately replace the damaged screen, and check whether the support beam is deformed.

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More detailed information about the common faults and quick solutions of horizontal vibrating screen can be found by visiting:https://www.hsd-industry.com/news/common-faults-and-quick-solutions-of-horizontal-vibrating-screen/

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How school desks and chairs can be reused

From the development history of school desks and chairs, we can see the rapid progress of industrial production and technology, from the beginning of the wooden desks and chairs, to plastic desks and chairs, and the emergence of steel and wood desks and chairs, are a great proof of the development of the times. As the name suggests, school desks and chairs are used in the campus, need to meet the use of a large number of students, therefore, compared to home desks and chairs, school desks and chairs will be more demanding, for example, it needs to be more rugged and more durable, practical and beautiful as far as possible, in order to ensure that to meet the use of a large number of students need. Moreover, we not only have to take into account the practical application of school desks and chairs, but also as far as possible to strive for school desks and chairs can be reused or recycled, this is to avoid waste of resources to meet the need to protect the environment. Below we will focus on the main features of school desks and chairs, the use of school desks and chairs as well as the efficient use of methods to carry out some discussions.

School desks and chairs have some subtle differences in different teaching scenarios, here we only discuss the main features. After all, want to reuse the premise is to do a good job in the selection.

school desks and chairs

1. Safe and comfortable: table legs are stable to ensure that the table is not easy to fall down. If the edges of the table and chairs have obvious bumps or sharp edges, it is obviously not going to work.

2. large storage: the table top is wide and provides enough space for studying and writing. It can improve students’ learning efficiency and comfort. At the same time, the footprint should not be too large to ensure that a classroom has enough space for placement.

3. Moisture-proof and flame retardant: students will come into contact with water when in use, so the waterproof and moisture-proof performance of desks and chairs must meet the requirements. Student desks and chairs also have certain requirements for flame retardant properties, because it is related to the safety of students’ lives.

4. Environmentally friendly materials: chairs and tables are well-designed, easy to clean and maintain. Desktop is directly in contact with the student body, is closer to the students, so the desktop substrate selection of environmental protection, formaldehyde emissions qualified, no odor.

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More detailed information about the school desks and chairs reused can be found by visiting:https://www.aoyangschoolfurniture.com/a/news/features-of-school-desks-and-chairs.html

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How to choose the right school desks and chairs

Choosing the right school desks and chairs is an important part of ensuring a comfortable learning environment for students, promoting healthy growth and improving learning efficiency. Sometimes we will see children lying on the table to write homework, or eyes sticking to the desk, etc., why this situation, seemingly insignificant habits can also cause harm to the child’s academic and physical health, we can not ignore. In the selection process, it is necessary to comprehensively consider the material, functionality, safety and cost-effective and other dimensions to ensure that the selected product can meet the actual teaching needs, but also take into account the physical and mental health of students. The following is a detailed discussion of these four aspects:

1.material: durable and environmentally friendly and important

There are wood, metal and plastic materials on the market, composite materials for desks and chairs, the choice of material must be healthy and harmless, then how to choose?
-Wooden: wooden desks and chairs with its natural, cozy appearance and better durability, become the first choice of many schools. It has a good texture, but costs more and requires regular maintenance to prevent cracking and deformation. When choosing, it should meet the national environmental standards,, to reduce the release of formaldehyde and other harmful substances, to protect the health of students.
-Metal and plastic materials: the use of metal frame and plastic panel design desks and chairs, often both excellent durability and lighter weight, easy to carry and daily cleaning and maintenance. When choosing metal components, priority should be given to materials with strong resistance to rust, such as stainless steel or galvanized steel; while for plastic desktops, it is necessary to ensure that they have good abrasion resistance, aging resistance, and verify that they are non-toxic and environmentally friendly to protect the health and safety of students and avoid any potential risks.

– Composite materials: With the rapid changes in technology, new composite materials such as fiberglass and high-density polyethylene have been adopted in the production of desks and chairs. These materials not only have excellent strength and light weight, but also meet the needs of diversified color and form design, adding more fun and beauty to the classroom. In the selection, environmental certification is also an important factor to consider.

school desks and chairs

2.functionality: to adapt to the needs of diverse learning

Quality children’s desk and chair design needs to be integrated into the principle of ergonomics. The height of the desk and chair need to be coordinated with each other to ensure that children can naturally form the correct sitting posture in the process, and promote healthy eye habits. Adjustability of the desk and chair is also a key factor when choosing. Ideally, they should be able to adjust flexibly according to the child’s height to accommodate different stages of growth.
-Adjustable height: students of different ages have different body shapes, which can be flexibly adjusted according to their body shapes through the relevant devices to minimize scoliosis, strabismus and other problems.
-Good storage function: the desk can be equipped with good storage function, not only can help students to keep the desktop clean and tidy, cultivate self-management ability, but also can make parents feel at ease a lot.

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More detailed information about the choose the right school desks and chairs can be found by visiting: https://www.aoyangschoolfurniture.com/a/news/choosing-the-right-school-desks-and-chairs.html

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