Existing form and working principle of excavator slewing bearing

The excavator slewing bearing is an indispensable structural component for mechanical rotation operations, and what form does the slewing bearing exist in this system structure? How does it work?

1. Slewing bearing

The excavator adopts a rotating column type slewing bearing. The rotation angle of the slewing part is generally equal to or less than 180°. It consists of upper and lower support shafts and upper and lower bearing seats welded on the slewing body. The bearing should be fixed on the frame with bolts, and the rotating body is rotated by the hydraulic motor inserted on the support shaft.

Slewing Bearings For Excavator

2. Turntable structure

The main bearing part of the turntable is a box-shaped structure welded by steel plates with high torsional and bending rigidity. The main frame, the boom and its hydraulic cylinder are supported on the lugs of the main beam.

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Preliminary Analysis of Notes on Debugging of Excavator Slewing Bearings

We all know that when the excavator is working, it can twist left and right, front and rear mainly by the slewing mechanism in the machine, and the slewing bearing plays a vital role as an important part of the slewing mechanism. When assembling and overhauling and using and maintaining the excavator slewing bearing, the debugging of the slewing mechanism will be carried out, and the tightness of the assembly structure of the excavator slewing bearing requires us to master the correct operation method to avoid misadjustment. So what are the precautions for the debugging of the excavator slewing bearing?

The debugging of the excavator slewing bearing generally refers to the debugging of the backlash between the output gear of the slewing reducer and the ring gear of the slewing bearing. The proper adjustment of the inter-gear yard not only ensures that the pinion gear and the large gear do not gnaw and cut each other, but also ensures that the excavator rotates and brakes smoothly. Under normal circumstances, the eccentric distance between the center of the pinion and the installation and positioning center of the rotary reducer is used, and the center distance between the pinion and the large gear is changed by rotating the rotary reducer, thereby changing the tooth side clearance of the gnawing gear to debug the rotary mechanism.

excavator slewing bearing

Since the sway of the excavator’s slewing brake is caused by the slewing reducer, the operator often mistakenly thinks it is caused by too large backlash, so he tries to adjust the backlash by rotating the slewing reducer. After the rotary reducer rotated a screw hole position, it was found that the debugging results were not satisfactory, and then another screw hole position was rotated.

1. Before debugging the slewing bearing mechanism of the excavator, it is necessary to identify the gear teeth with large radial full runout of the pitch circle of the gear on the large gear and the direction of the midpoint of the pinion of the slewing reducer.

2. The slewing mechanism can only be debugged when the gear teeth on the pinion and the gear pitch circle on the big gear with full beating in the radial direction are engaged, that is, the slewing reducer can be rotated. There will be no interference between the gear and the big gear, and the big gear cannot be gnawed.

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How to identify the quality of crossed roller bearings?

Crossed roller bearing is a special type of bearing with split inner ring and rotating outer ring. Because of its particularity, it is generally used in industrial robots, as a joint bearing for industrial robots, and can also be used for precision rotation work. Tables, medical instruments, etc. are widely used, so the quality of bearings is very important. How to distinguish the quality of crossed roller bearings?

1. Choose a reliable manufacturer

Generally, the bearings produced by good manufacturers are no problem, and the quality is guaranteed. Therefore, when purchasing, you must choose some well-known, or well-reputed, and highly rated manufacturers for selection. This can also avoid quality problems in the bearing.

2. Check the outer packaging of the bearing

Under normal circumstances, a normal bearing company with its own brand will have its own company’s brand logo, and will also have its own product packaging, and will arrange for factories that have passed the production conditions to produce product packaging, so whether the packaging is from The lines to the color blocks are very clear, and there will be a logo of your own company.

Crossed-Roller-Bearings

3. Look at the steel printing on the bearing

Generally, the bearing will have its own brand’s words and brand’s logo, as well as labels, etc., and the handwriting will be very clear, and generally use steel printing technology, and embossing before heat treatment, so the font Although small, it is deeply recessed and very clear. And some counterfeit products with poor quality fonts will be very blurry and easy to fall off.

4. Listen to whether there is noise

You can pick up the bearing. Hold the bearing body sleeve with your left hand, and turn the outer sleeve with your right hand to make it rotate, and listen to whether there is any noise. Due to the backward production conditions of most counterfeit products and the completely manual workshop operation, it is inevitable that impurities such as sand will be mixed in during the production process, so there will be noises when rotating. And good quality products will not happen, because impurities will affect the normal use of the bearing.

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What are the application forms of industrial robot bearings?

We all know that the crossed roller bearing is one of the commonly used bearings for robots, and it also plays a vital role. Industrial robots are also very common in industrial production, achieving refinement that humans cannot do, and robots will never tire. Can work all the time, which has played a great role in the production and processing industry. So what are the application forms of industrial robot bearings?

Industrial robot bearing application form

crossed roller bearing

1. Machine tool loading and unloading robot

Single machine loading and unloading is a typical and mature application of robots on machine tools. It is more accurate, fast and safe than manual loading and unloading. For the processing of small and medium parts of crossed roller bearings with large production batches and short processing times, or heavy workpieces that need to be hoisted, the advantages of robot loading and unloading are obvious.

The crossed roller bearing is used in the robot. The structural relationship between the robot and the machine tool is divided into two forms: the robot is installed outside the machine tool and the structure is formed with the machine tool. Robots installed outside the machine tool are divided into fixed, mobile and truss types.

2. Stand-alone machine tool loading and unloading robot

The single-machine version of the truss robot is equipped with automatic loading and unloading equipment for a single CNC machine tool to meet the single-process automatic production of parts. The truss adopts high-strength steel beam, double-column structure, pure modular design, suitable for automatic loading and unloading of various workpieces such as shafts, discs, and rings. It has the advantages of flexibility and universality, fast moving speed, high positioning accuracy and long service life.

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What are the advantages of using a John Deere tractor?

With the continuous advancement of science and technology, tractors have entered our daily life, and its application is more and more popular with everyone, and the development trend is showing continuous growth. The use of John Deere tractors has a long history, due to the advantages of turbocharged intercooled engines, shifting transmissions, powerful hydraulic systems, safe and applicable driving conditions, stable tractor clutches and reliable service guarantees, etc. Gradually stand out in the field of shredders.

With the rapid development of the economy, China’s agricultural mechanization has entered a stage of vigorous development. Agricultural mechanization is an important symbol of agricultural modernization, and agricultural machinery is an important carrier to realize agricultural mechanization. The level of agricultural machinery and equipment directly affects the level of agricultural mechanization. With the intensification of competition in the agricultural machinery industry, John Deere tractors are favored in my country due to their many leading features.

Advantages of using a John Deere tractor

(1) Equipped with John Deere imported engine

John Deere’s engines generally use turbocharged intercooled engines, which can quickly adapt to load changes and have excellent performance. The control unit of the turbocharged intercooled engine is electronically controlled, which controls the fuel cutoff more accurately, saves the fuel cutoff lever on the instrument panel, and can control the engine through the key. The operation is simple and convenient, and the fuel efficiency is high; High pressure common rail technology reduces fuel consumption and is economical; equipped with dual temperature cooling system, high cooling efficiency, reducing the frequency of abnormal tractor temperature; turbocharged intercooled engine with high rated power, high torque reserve, and high specific resistance It can still easily complete the expected tasks in the soil environment of 10000W It also improves the airflow and filtration efficiency, makes the engine life longer, and is very beneficial to environmental protection.

(2) Shift gearbox

The John Deere tractor adopts a meshing sleeve shift gearbox. With the continuous reform and innovation, the main and auxiliary transmission area has changed from 12 forward gears and 4 reverse gears to 18 forward gears and 6 reverse gears in 2011. This John Deere tractor has the ideal working speed for a variety of field jobs. The agricultural machine operator can choose the appropriate gear according to different operations, different agricultural equipment, changes in vehicle speed, slope of the ground, specific resistance of the working soil, and the size of the traction equipment to meet the needs of different agronomy. Since the meshing sleeve shift gearbox has a double-acting clutch, it does not need to step on the clutch pedal or stop the vehicle to complete the shift within the segment and realize the power reversal. Bring a higher operating experience. The two-speed PTO shaft safety shield ensures safe operation and use. John Deere tractors use an original clutch that lasts the same as a tractor.

14-Inch-29-Spline-Copper-Based

(3) Hydraulic system

The John Deere tractor adopts a closed-center pressure and flow compensation hydraulic system. The unique hydraulic system not only allows the John Deere tractor to have higher control accuracy and faster response speed, but also reduces fuel consumption, noise, and more. Large lift force and more accurate implement adjustment. Not only that, but also equipped with two sets of hydraulic output valves as standard, these two sets of output valves can be equipped with hydrostatic power steering and braking according to the needs of the work, so that the entire John Deere tractor can be operated more easily and the braking effect is better. . Due to the existence of the hydraulic oil filter, its high-efficiency filtering ability can keep the hydraulic system clean, improve the working efficiency of the John Deere tractor, and reduce the maintenance cost of the tractor. The position of the oil dipstick of the tractor is reasonable, which is convenient for the farmer to observe the change of the oil level, which avoids the lack of oil during work and reduces the work efficiency.

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How to use the agricultural machinery clutch correctly?

The so-called clutch is to use “off” and “on” to transmit the right amount of power. The clutch consists of a friction plate, a spring plate (the tractor uses a disc spring, and the harvester uses a diaphragm spring), a pressure plate and a power take-off shaft. It is arranged between the engine and the gearbox to transmit the torque stored on the engine flywheel. To the gearbox to ensure that the agricultural machinery transmits the appropriate amount of driving force and torque to the driving wheel under different working conditions.

Clutch is a frequently rubbed part on agricultural machinery (friction plate is a wearing part), it will wear with the increase of use time and frequency, which will cause clutch slip phenomenon.

The clutch is the device that connects the agricultural engine and the transmission, and the clutch pedal is the operating device of the clutch. When the clutch pedal is stepped on or lifted, the engine and the transmission will be temporarily separated or smoothly combined to cut off or transmit power, and realize changes in the movement state of agricultural machinery such as starting, shifting, and parking. Slowly lift the clutch until it is fully lifted. If the engine stalls when the clutch is lifted, it means that the clutch is not slipping. If the engine does not stall when the clutch is lifted, it may be a problem with the clutch.

Features of clutch for agricultural machinery

Tractor clutch: The tractor clutch generally uses a double-acting clutch, that is, one way is responsible for walking, and the other way is responsible for power output. Due to structural reasons, the gap between the flange of the clutch pressure plate and the casing is relatively small, especially when the air humidity is high, and the tractor is not used every day (sometimes out of use for several months), so it is bound to be prone to rust. , The adhesion between the pressure plate bracket and the flange is caused by rust, which leads to the incomplete separation of the clutch.

Suggestion: Before using the tractor that has been parked for a long time, the tractor operator should first open the clutch observation port, use a flat-blade screwdriver to turn the clutch assembly, and spray a little rust remover on the three flanges of the clutch pressure plate, and then step on the A few clutch pedals to move it back and forth, and then use the tractor normally for various tasks.

K series

How to operate the clutch

First, press the pedal firmly with the forefoot of your left foot, and step down or lift the clutch pedal with the flexion and extension of the knee and hip joints. Do not use the toes, soles or heels to step on the clutch pedal to prevent insufficient pedal strength or slip off. pedal. The action of stepping on the clutch pedal should be fast and all the way to the end, so that the clutch can be completely disengaged when the clutch pedal is lifted.

It should be determined according to the manipulation situation. Generally, when the working gear is changed to neutral, the clutch pedal can be lifted quickly. When the agricultural machine starts or shifts, the free stroke before the disengagement is not yet engaged can be slightly faster. When the clutch starts to engage When the clutch is fully engaged, the foot should be quickly removed from the pedal and placed under the pedal. When the clutch is not used in the work of agricultural machinery , Do not put your foot on the clutch pedal, so as not to cause the clutch to have a semi-linked phenomenon, affect the transmission torque, and increase the wear of the parts.

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How to identify the quality of auditorium chairs?

There are many auditorium chairs and cinema chairs in the market, and people are dazzled at the exhibition, and there is no way to start when choosing. What are the specific styles of auditorium chairs and theater chairs? For those who don’t understand, they are the same except for the appearance. They don’t know how to identify the quality and where to choose. In fact, auditorium chairs and cinema chairs are classified from bottom to top. Looking down at the feet, auditorium chair tripods can be divided into aluminum alloy feet and iron feet.

Aluminum alloy feet: The aluminum alloy feet are made of aluminum alloy materials, which are light in weight and are not easy to corrode in a humid environment; they will not deform or crack in a high temperature environment; the service life is relatively long, which can meet the different needs of customers (bending or pulling straight).

Iron feet: The iron feet are hard, heavy, and brittle. The surface is electroplated and easy to rust.

Looking at the seat back outer panel, the outer panel is divided into paint panel and plastic shell.

Painted board: The high-quality multi-layer board is cold-pressed by a mold and painted to prevent cracking effectively.

Plastic shell model: The plastic back shell is made of high-quality PP (polypropylene) multi-element conforming material and is molded by injection molding, with a thickness of 3mm. The seat rubber shell is made of high-quality PP (polypropylene) multi-element conforming material by injection molding, with a thickness of 4-6mm. With a muffler hole, it can effectively remove ambient noise.

Multimedia classroom soft chair

According to the above description, auditorium chairs can be roughly divided into 4 categories: aluminum alloy paint models, aluminum alloy plastic shell models, iron foot paint models, and iron foot plastic shell models.

We have a certain understanding of the types of auditorium chairs through the above, but after all, professional people are in the minority, how to distinguish the quality of auditorium chairs?

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To improve the screening efficiency of linear vibrating screen, these aspects cannot be ignored!

Linear vibrating screen is one of the main equipment for crushing and screening, and it is also the key equipment to provide qualified materials for subsequent operations. Its screening efficiency directly affects subsequent operations. In the actual dressing plant, the main factors affecting the screening efficiency of the linear vibrating screen include: material properties, screen surface structural parameters, vibration characteristic parameters and so on. Next, the vibrating screen manufacturer will specifically analyze how the above aspects affect the screening effect of the linear vibrating screen.

Material properties

The nature of the selected material is one of the main factors affecting the screening efficiency of the linear vibrating screen, and its material properties are mainly reflected in the loose density of the material, the particle size of the material, and the shape of the material.

1. Loose density of selected materials

Generally, the loose density of the material is large and the bulk particles are easy to pass through the screen, and the screening efficiency is high. The effective screening area of ​​the sieve is reduced, which in turn affects the screening efficiency. In order to ensure the screening efficiency, it is necessary to control the bulk density of the selected materials.

2. Selected material particle size

The particle size of the selected material is also an important factor affecting the screening efficiency of the linear vibrating screen. The particle size of the material entering the sieve should meet the size of the sieve hole. Small particles are easy to sieve, and large particles are not easy to sieve. To ensure the screening efficiency, it should be strictly controlled. Into the sieve material particle size.

3. The shape of the material entering the sieve

The shape of the material entering the sieve will affect the sieving performance. Generally, the particles are fully ground and are easier to sieve than the mineral particles of the specification. The sieving rate of materials with irregular particle shapes such as long strips and flakes is poor. Therefore, it is necessary to ensure that the particle shape of the crushed material conforms to the sieve hole standard.

High frequency dehydration vibrating screen

Screen structure parameters

The structural parameters of the linear vibrating screen are mainly reflected in the length and width of the screen surface and the size and shape of the screen hole.

1. Length and width of screen surface

The length of the screen surface of the linear vibrating screen mainly affects the screening efficiency, and the width of the screen surface mainly affects the productivity. The sieve surface of the linear screen is longer, the residence time of the material on the sieve surface is longer, and there are more opportunities to pass through the screen, which will improve the screening efficiency. In fact, the width of the screen surface has different effects on the screening efficiency and the length of the screen surface on the screening capacity.

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How to choose the correct crusher

Crushing equipment is divided into jaw crusher, gyratory crusher, cone crusher, roller crusher, rotary disc crusher, impact crusher and hammer crusher according to the structure and working principle.

Jaw crusher: It has the characteristics of large crushing ratio, uniform product quality, simple structure, reliable operation, easy maintenance, economical operation cost, etc. Various materials not exceeding 320MPa.

Cone crusher: large crushing ratio, high efficiency, uniform particle size, mostly used for medium and fine crushing of medium hardness rocks.

Impact crusher: It can handle materials with a side length of 100-500mm, and its compressive strength can reach up to 350MPa. It has the characteristics of large crushing ratio, cubic particles after crushing, and uniform particle size. It is widely used in stone crushing in highway engineering. middle.

Hammer crusher: suitable for crushing minerals of various brittle materials. The compressive strength of the material should not exceed 100MPa, and the humidity should not exceed 15%.

Factors to consider when choosing a crusher

Hammer Crusher

When selecting a crusher, the type, hardness, particle size of incoming and outgoing materials, output and construction site of the crushed materials should be fully considered.

1. The hardness of the material

Different types of materials have different hardness. In general, the higher the hardness, the higher the crushing difficulty coefficient. When crushing hard or medium-hard stones, jaw crushing equipment should be used as the primary crushing equipment. When crushing medium-hard or soft stones, cone, counterattack or hammer crushers can be directly used.

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DETAILED EXPLANATION OF COLD FORGING TECHNOLOGY

Cold forging is a process in which metals are formed by forging at room temperature. Cold forging includes deformation forms such as upsetting, die forging and extrusion, and is a cold bulk forming. The cold forging process was developed from cold extrusion and gradually extended to cold die forging and cold precision forging.

Compared with hot die forging, the main advantage of cold forging is that the blank is not heated, so there are no forging dimensions and inherent quality problems caused by heating, and heating equipment is omitted. Cold forgings have high dimensional accuracy, small roughness values, reduce cutting, save materials and reduce costs, and are easy to realize mechanized and automated production. Therefore, it is widely promoted and applied in industries such as automobiles, motorcycles, bicycles, tractors, home appliances, textile machinery, military industry and aviation industry, and is expanding day by day.

TYPES OF COLD FORGINGS

1. Extrusion: cold extrusion, which can be divided into positive extrusion, reverse extrusion and compound extrusion.

2. Upsetting category: cold upsetting can be divided into upsetting and partial upsetting
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3. Die forging: It is finally formed by cold forging, which can be divided into small burr die forging and closed burr-free die forging.

4. Precision forging: cold precision bevel gear tooth profile, spline and straight tooth profile.

Bracket-k

COLD FORGING PROCESS CHARACTERISTICS

Cold forging products are of good quality, processed at room temperature, with high dimensional accuracy, smooth surface and good mechanical properties. It can also process forgings with complex shapes, reduce cutting, save material consumption and reduce costs.

The deformation resistance is large, and measures to reduce the deformation resistance must be taken: adjusting the chemical composition of raw materials, pre-treatment of the blank, improving the deformation process, improving the hardness and finish of the mold, and controlling the pressurization speed of the equipment.

Cold deformation strengthening and thermal effect, in the process of cold forging, as the degree of deformation increases, the cold deformation strengthening phenomenon in which the strength and hardness of the metal also increase. Cold deformation strengthening can be used to strengthen the strength and hardness of the product and improve the mechanical properties.

Details can be accessed by clicking here:https://www.gold-emperor.com/cold-forging-technology/

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