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Excavators, also known as excavators, are indispensable mechanical vehicles in engineering construction. The use of buckets to excavate earthwork and materials that need to be cleaned has greatly accelerated the construction progress and efficiency. When the hydraulic excavator is working, the slewing mechanism needs to be frequently the reciprocating action to make the bucket work.

It can be seen that the slewing mechanism is an important part of the hydraulic excavator. So, do you know the composition and working principle of the hydraulic excavator slewing mechanism?

The composition of the excavator slewing mechanism

The excavator slewing mechanism is mainly composed of a slewing brake, a slewing reducer, a slewing bearing and a slewing hydraulic system.

1. Swing brake

The swing brake is set on the swing reducer and controlled by the swing hydraulic system. The structure of various excavator brakes is different, but the principle is basically the same. Taking a certain type of hydraulic excavator as an example, its rotary brake adopts normally closed, spring clamping, multi-disc, wet brake. When the excavator turntable stops rotating, the brake is applied to brake. When the turntable rotates, the hydraulic system pilot pressure oil pushes the brake. The moving piston compresses the spring to release the brake.

2. Rotary reducer

The slewing reducer is fixed on the turntable and is connected with the output shaft of the slewing motor. The output shaft of the slewing reducer is provided with a pinion, and the slewing bearing is provided with an inner gear ring. When the slewing motor drives the slewing reducer to rotate, the pinion mounted on the output shaft of the slewing reducer meshes with the ring gear of the slewing bearing. The revolving motion of the gear drives the turntable and the upper working device to rotate together.

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For more details click to visit:https://www.excavatorbearing.com/a/bearing-knowledge/Excavator-slewing-mechanism-composition-and-working-principle.html

The tractor clutch is composed of four parts: the active part, the driven part, the pressing mechanism and the operating mechanism. The main component of the active part is the driving disc; the main component of the driven part refers to the driven disc with friction linings riveted on both sides; the main components of the pressing mechanism are the pressing spring, pressing lever, and pressing rod bracket; The main components are separation lever, separation bearing, etc. So how to overhaul these main components, let’s find out together!

1. Overhaul of driving disk and driven disk

The main damage of the active disk is wear, scratches, burns and cracks on the friction surface; warpage and deformation of the friction surface. When the thickness of the active disc is 18±0.1 mm, the surface groove depth exceeds 0.50 mm, the arch deformation exceeds 0.30 mm, and the flatness tolerance exceeds 0.12 mm, it should be ground or flat. However, after polishing, its thickness is not less than 16±0.40 mm. If the active disk is cracked or too thin, it should be replaced with a new one.

The driven disc is the most vulnerable part of the clutch. The main damage is wear, hardening, burns, cracks on the surface of the friction plate, oil stains on the surface (dry type), loose friction plate, warping and deformation of the driven disc, fracture of the steel plate, loose riveting between the steel plate and the disc, spline holes wear, etc. It can be determined by measuring the depth of the rivet head with a vernier caliper. The burial depth of the rivet head shall not be less than 0.3 mm, otherwise, use a new friction plate.

If the friction plate is seriously worn or there are more than two cracks and fall off, and the burnt surface is large and deep, the new plate should be riveted again. If there is a slight oil stain on the friction plate, it can be burned off with the flame of a blowtorch, or cleaned with gasoline, and the slight burnt surface can be polished with sandpaper. When replacing the new piece to remove the old piece, use a drill bit 0.40-0.50 mm smaller than the diameter of the old rivet to drill out the rivet head, and then gently punch out the old rivet and remove the old piece. Use a wire brush to remove dust and rust from the driven disc, and check other parts of the driven disc. The warpage of the driven disc steel plate will cause the clutch to vibrate and wear unevenly when starting, so its warpage should be checked.

The warpage of the driven disc steel sheet is also called circular runout or yaw. It can be installed on the inspection frame and measured at the outermost edge of the driven disc with a dial indicator. The circular runout limit is 0.80 mm. If it exceeds the limit, it can be calibrated by cold pressing with a special clamp.

2. Maintenance of elastic push rod

The main damage of the elastic push rod is the weakening of the elastic force, the reduction of the hole center distance, the wear of the support hole, and the breakage of the elastic push rod. After the elastic force of the elastic push rod is reduced, it is heated to 780 ~ 810 ° C, quenched in oil, and then heated to 450 ~ 475 ° C for tempering.

When the center-to-center distance of the elastic push rod becomes smaller, the original center-to-center distance can be restored by thermal deformation method. between the mouth. Increase the center distance of the holes, and then perform quenching and tempering according to the above method. When the center distance of the pin holes is enlarged, care should be taken to make the center lines of the two pin holes parallel. When the fitting clearance of the pin hole of the elastic push rod is greater than 0.50 mm, it can be repaired by the maintenance dimension method. The maintenance size can be increased by 1 mm, and the fitting clearance between the pin and the hole is 0.12 mm.

For more details click to visit:https://www.syclutch.com/news/overhaul-of-main-parts-of-tractor-clutch.html

Because the working environment of the ball press is harsh and the work intensity is relatively high, maintenance and inspection are very necessary in the daily use process, especially now that the temperature is gradually rising, more attention needs to be paid, so the ball press equipment needs to be paid attention to in summer .What are the problems?

Problems that need to be paid attention to in the summer of briquetting machine equipment

1. Prevent high temperature

①Before the briquetting machine starts to work, turn the pulley 1-2 circles by manpower, and then start the machine after confirming that the operation is normal. Be sure not to feed the material directly after starting the machine. It can only be done after the ball press is running normally. Generally, this time is about 2-3 minutes;

② During the operation of the ball press, it is necessary to always pay attention to the temperature of the bearing and hydraulic oil to keep it in a good constant temperature state, and always pay attention to whether there is any abnormality in the sound and vibration.

2. Check for wear

①After the briquetting machine is stopped, check whether the bolts are loose and how the wearing parts are worn.

② Always ensure the uniformity and consistency of the feeding of the briquetting machine, not excessive, of course not too small, remember that hard objects such as stones or iron enter the machine;

③ If it is found to be abnormal, stop the machine immediately to check, find out the cause, and confirm whether it is stuck by the object, or the pressure roller or other parts are damaged;

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Details can be accessed by clicking here:https://www.zymining.com/blog/problems-that-need-to-be-paid-attention-to-in-the-summer-of-briquetting-machine.html

We know that the slewing bearing has a very important role in some production, and in order to ensure these functions, we need to perform a lot of operations on the slewing bearing during the use of the slewing bearing. The sealing of the more common bearings, then why should the slewing bearing be used? to seal? What are the common sealing methods of slewing bearings?

The role of sealed slewing bearing

1. Isolate foreign objects from outside

Protect the bearing to prevent external dust, dirt, metal particles, moisture, acid gas and other debris from invading the inside of the bearing. If the bearing is poorly sealed and external debris invades, the working condition of the bearing will be significantly deteriorated, and the service life of the bearing will be significantly reduced.

2. Prevent grease leakage

If the oil leaks, it will quickly destroy the normal lubrication of the bearing, causing the bearing to burn out due to heat. In addition, the poor sealing device not only causes waste of oil leakage, but also contaminates mechanical equipment and processed products. Therefore, to make the machine work properly, the bearing must have a good sealing device.

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Details can be accessed by clicking here:https://www.ldb-bearing.com/ldb-bearing-knowledge/sealing-method-of-slewing-bearing.html

Lime digester, also called ash digester, lime digester, is a special equipment for digesting quicklime (calcium oxide) into lime milk or slaked lime powder. The lime digester has the function of vigorously stirring and digesting quicklime. It has the characteristics of simple operation and maintenance, thorough digestion, high production efficiency, large specific surface area of the digested slaked lime powder, environmental protection and hygiene, etc. It is especially suitable for the digestion of poor quality quicklime.

STRUCTURE OF LIME DIGESTER FOR CALCIUM HYDROXIDE EQUIPMENT

Stirring tank lime digester (ash mixer) is mainly a device that digests quicklime into slaked lime powder, and can also digest quicklime into lime milk. It is divided into two types: single-shaft stirring and double-shaft stirring. Combination of two forms. Each is composed of a power unit, a stirring tank body, a stirring shaft, a wear-resistant stirring blade, a spray device, and a dust removal device.

THE CHARACTERISTICS OF CALCIUM HYDROXIDE EQUIPMENT LIME DIGESTER

1. The equipment has its own independent and reasonable dust removal system, so there is no pollution, and the equipment has the characteristics of compact structure:

2. A set of screw feeders are designed at the feed port of the digester to prevent the backflow of steam and dust generated during the digestion process, so that the formed steam and dust can be concentrated to the dust outlet and enter the dust removal equipment to reduce corrosion and damage to surrounding equipment. damage, provide an excellent working environment. At the same time, the utilization rate of quicklime is also improved. This equipment adopts the cover type water adding device, the water adding amount is more uniform, and the quicklime is digested more thoroughly.

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Details can be accessed by clicking here:https://www.ly-gaifeng.com/blog/structure-of-lime-digester-for-calcium-hydroxide-equipment.html