How to Repair Excavator Slewing Bearing

During the operation of the excavator, the slewing bearing has to bear a large impact load. When the excavator is tilted, the stress state is even more unfavorable. Generally, when the excavator runs for about 350,000 hours, the slewing bearing of the excavator may be crushed or broken, and the tooth profile wear and broken teeth at the junction of the two halves of the ring gear are particularly serious. Practice has proved that using insert welding to repair the slewing bearing is simple and fast, and can ensure the performance of the whole machine.

1. Preparation before welding

(1) According to the damage of the ring gear, determine the position of the fixing hole and the damaged segment to be replaced, and then cut off the segment of the tooth to be replaced by gas cutting.

(2) According to the part of the ring gear that needs to be repaired, process and make inserts, or cut out a section of relatively good gear teeth from the corresponding part of another old ring gear under the condition of ensuring the pitch, and gas cut out the joint groove shape.

(3) Determine the position of the fixing hole of the insert, and drill the hole to fix it on the corresponding part of the ring gear. Note that the accuracy of the position of the fixing hole must be ensured.

excavator slewing bearing

(4) In order to ensure that the weld has high strength and can withstand large shock and vibration, the junction 507 electrode with a diameter of Φ4 mm is selected, and the electrode should be baked at 250-350 °C for 1 h before use.

(5) AX3500 DC arc welding machine is used for welding with DC reverse connection method, and the current is 130-140 A.

2. Welding process

(1) Preheat before welding, use 2 large gas torches to heat the welding surface to about 200 ℃.

(2) Using the tempering weld bead method, the latter weld has a tempering effect on the previous weld, which is beneficial to eliminate the hardened structure produced by the previous weld.

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More detailed information on how to repair the excavator slewing bearing can be accessed by clicking:https://www.excavatorbearing.com/a/bearing-knowledge/excavator-slewing-bearing-repair.html

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What are the damage forms of thin-walled crossed roller bearings?

Thin-walled crossed roller bearings are composed of crossed cylindrical roller bearings and crossed tapered roller bearings. Due to their particularity and incomparable advantages over other bearings, they are widely used, and some damages will inevitably occur in the use engineering , so what are the damage forms of thin-walled cross rollers?

Surface wear and peeling of rolling elements (balls and balls, etc.) and inner and outer ring raceways:

This will cause the radial clearance and axial clearance of the thin-walled crossed roller bearing to increase, the thin-walled crossed roller bearing will emit noise and heat during operation, and change the correct working position of the mating shaft, resulting in vibration. The initial stage of surface fatigue spalling is pitting on the surface, which develops into flaky surface exfoliation. Both the rolling elements of the bearing and the raceway surfaces of the inner and outer rings are subjected to periodic pulsating loads, resulting in periodically changing contact stress.

When the number of stress cycles reaches a certain number, fatigue spalling occurs on the working surface of the rolling elements or inner and outer ring raceways. If the load of the bearing is too large, this fatigue will be exacerbated. In addition, if the bearing is installed incorrectly and the shaft is bent, the raceway will also peel off. The fatigue spalling of the bearing raceway will reduce the running accuracy of the shaft and generate vibration and noise.

crossed roller bearings

Wear of mating surfaces of inner and outer rings:

This is because the inner and outer rings of the thin-walled crossed roller bearing are not assembled with the shaft and the housing hole, which destroys the matching relationship between the bearing and the housing, the bearing and the shaft, and further accelerates the matching between the bearing itself and the shaft or housing that matches it. Surface wear (commonly known as the inner or outer ring of the shaft).

Spacer wear and looseness:

During work, the isolation ring and the rolling elements (balls, rollers, etc.) rub against each other, and if the lubrication is poor, the wear will be accelerated. After the isolation ring is worn, the rolling elements will loosen, and in severe cases, the isolation ring will fall apart and the rolling elements will fall off.

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More detailed information about the damage forms of thin-walled crossed roller bearings can be accessed by clicking:https://www.prsbearings.com/a/news/damage-forms-of-thin-walled-crossed-roller-bearings.html

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How to adjust the height of tractor clutch lever

The clutch assembly consists of three sets of tractor clutch disc, clutch pressure plate and release bearing. The tractor clutch disc is a composite material with friction as the main function and structural performance requirements. Friction materials are mainly used to manufacture brake friction plates and tractor clutch discs.

The inner end of each release lever of the tractor clutch and the release bearing must be in contact together, so that the vehicle can start smoothly. If the height of the inner end of the disengaged lever is different, the tractor clutch will vibrate when it is tightly connected.

Therefore, during assembly and maintenance, it is necessary to check the contact between the inner ends of each separated lever and the release bearing. It is required that the inner ends of each separated lever be located on the same plane, and the deviation should comply with the original regulations, generally not exceeding 0.25 mm. If it does not meet the requirements, it should be adjusted by adjusting the position of the adjustment screw at the inner end of the separated lever or the toe.

For the pulsation damper spring clutch, if the pulsation damper spring is separated, it means that the load on the pulsation damper spring is uneven or reduced due to damage, corrosion, cracking, etc., it must be upgraded. The spring separation means of the pulse damper must be evenly arranged on the center of the circle, and the deviation should not exceed 0.5mm.

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More detailed information on how to adjust the height of the tractor clutch lever can be found here:https://www.syclutch.com/news/tractor-clutch-lever-height-adjustment.html

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Detailed Explanation of Grow Rack Ventilation Solutions

The grow rack technology provides convenience for plant lovers, but the temperature and humidity control of the grow rack is particularly important for plants. Too high or too low temperature and humidity will affect the planting quality and even cause diseases and insect pests. If some effective measures can be taken to make the ventilation and cooling effect of the grow rack better, and at the same time reduce its operating cost, the ventilation system will become a link that consumes a lot of energy for the grow rack.

How to control the temperature of the grow rack?

It is mainly adjusted by means of ventilation and heating, that is, a ventilation system, to ensure the necessary ambient temperature required for the growth of plants. The cooling of the grow rack is mainly through the exchange of air inside and outside the frame, and ventilation to adjust the internal temperature.

Fan forced cooling system is the best cost-effective

When choosing an evaporative cooling method (wet pad-fan cooling system, spray humidification and cooling system), it is necessary to make a technical and economic comparison of the “one-time investment and operating costs” of each plan, and minimize the total cost as the goal of the optimization plan. At present, the fan forced cooling system has become the most widely used ventilation and cooling system. This system is combined with a special axial flow fan for the greenhouse and a wet curtain, and the ventilation is fast and the temperature is cooled very quickly. After many experiments, it has been shown that the fan forced cooling system has become a cost-effective ventilation and cooling solution with good cooling effect and low cost.

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For more detailed information about grow rack ventilation solutions, please click to visit: https://www.etegreen.com/blog/grow-rack-ventilation-solutions/

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Overall scheme design of paper yarn composite bag square bottom machine

The bottom paste process of traditional paper yarn composite bags mainly adopts the method of artificial bottom paste, which has low production efficiency, uneven specifications and low quality; practice shows that in the case of producing paper bags of the same specification, the bottom paste can be improved compared with manual sewing. 20% capacity, 8% paper saving, 12% cost reduction. In order to solve these problems, the packaging industry urgently needs an automatic bottom paste equipment to reduce labor costs and waste materials and improve efficiency.

Traditional artificial bottom paste is divided into two ways: artificial seam bottom and artificial bottom paste.

The specific steps of artificial bottom sewing are as follows:

(1) Prepare the produced paper tube, use the sewing machine, yarn and glue for sewing the bottom;

(2) The worker dips the yarn in glue and installs it on the sewing machine;

(3) Use a sewing machine to sew one end of the paper tube through glued yarn;

(4) Paste the valve port on the other end of the paper tube and sew it with glued yarn;

(5) Spread out the paper bags sewn at both ends to dry, and complete the seam bottom work of the paper bags.

HD200A-IIIDJ Square Bottom Machine

Traditional artificial bottom paste process:

(1) Workers mark the position of one long indentation, two 45° indentations and two vertical indentations on the paper tube, and manually indent and cut them;

(2) Unfold the bottom of the bag and fold two indentations manually;

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For more detailed information on the overall design of the paper yarn composite bag square bottom machine, please click to visit:https://www.lyhuatianm.com/products-information/scheme-design-of-paper-yarn-composite-bag-square-bottom-machine.html

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HOW MUCH IS CALCIUM HYDROXIDE PRODUCTION LINE

With the further development of the industry, the lime deep processing industry has a broad market prospect, and the professional lime deep processing production line is the equipment that helps the industry create value. Professional calcium hydroxide production line equipment, with the advantages of high efficiency and high output, environmental protection and noise reduction, helps calcium hydroxide grinding projects to create value.

So, what is the price of calcium hydroxide equipment? In fact, regarding the price of a complete set of calcium hydroxide production line, users first need to learn how to select equipment. Different project requirements have different matching production line plans. Therefore, the price of a complete set of calcium hydroxide production line will also vary.

The calcium hydroxide production line mainly includes a calcium hydroxide digestion system, a mill, a series of fine powder separators, and an integrated grinding system. Among them, the digestive system is an intelligent water distribution system, which adopts a dual dust removal system of pulse bag filter and water dust removal to achieve efficient dust removal. Rapid hot water ash can speed up digestion and milling rate. The pulverizer is a large-scale grinding equipment, which can be reused, improved efficiency, and reduced costs. The fine air separator has high powder selection and cleanliness, and the energy saving effect is remarkable, which can greatly improve the output and whiteness of the mill system.

GFEX Case

The digester system is mainly a device for digesting quicklime into slaked lime powder, and can also digest quicklime into lime milk. The main principle of the slaked lime digester is that after the spraying device sprays water to the quicklime in the digester according to a certain amount of water supply, the quicklime is strongly stirred in the mixing tank by the rotation of the wear-resistant stirring blade and gradually melted, digested, matured, Homogenization. Digester has the following industry advantages.

1. Precise water distribution system

This system will carry out computerized precise water distribution according to the specific gravity of quicklime entering, which completely solves the problem of continuous water distribution by the water distribution valve under the conditions of uneven feeding, intermittent feeding, and stop feeding.

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For more detailed information about the price of calcium hydroxide production line, please click to visit：https://www.ly-gaifeng.com/blog/calcium-hydroxide-production-line-price.html

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What are the vibrating screen techniques?

The process in which the broken material is divided into different particle sizes through one or several layers of sieve surface is called sieving. The vibrating screen is a vibrating screen that uses the relative movement between the bulk material and the screen surface to make some particles pass through the screen holes, and divide sand, gravel, crushed stone and other materials into different grades according to the particle size.

The vibrating screen screening process is generally continuous. After the screening raw materials are fed to the vibrating screen machine (referred to as the sieve), the materials smaller than the sieve size pass through the sieve, which is called the under-sieve product; the material larger than the sieve size passes through the sieve. Continuous discharge on the surface is called over-sieve product.

Vibrating screen machinery is a necessary auxiliary equipment in mine crushing and sand making production lines, and its selection has an important impact on the particle size and grading of the final product.

Factors to be considered in vibrating screen selection:

High frequency dehydration vibrating screen

The characteristics of the sieved material (the content of the size of the material under the sieve, the content of the size of the difficult-to-sieve particles, the content of moisture and clay in the material, the shape of the material, the specific gravity of the material, etc.);

The structure of the vibrating screen (screen area, number of screen layers, size and shape of the screen hole, area ratio of the screen hole, motion mode of the vibrating screen, amplitude and frequency, etc.);

Requirements of beneficiation process (processing capacity, screening efficiency, screening method, vibrating screen inclination), etc.

In addition to considering the above effects, the following basic principles should also be observed:

(1) After determining the sieving area, the width of the sieve surface should be at least 2.5 to 3 times the size of the largest piece of material to prevent the sieve from being blocked by large pieces of material.

(2) In order for the sieve to be in a good working condition, the ratio of the length to the width of the sieve should be selected within the range of 2 to 3.

(3) Reasonable screen material and structure suitable for working conditions should be selected.

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For more detailed information about the vibration screening type, please click to visit:https://www.hsd-industry.com/news/vibrating-screen-techniques/

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How to deal with the severe wear of the hammer head of the crusher?

The hammer head of the crusher is an important part to ensure the normal production of ore materials. It not only affects the output of sand and gravel aggregates, but also affects the quality of finished products. Many users are deeply troubled by the serious wear of the hammer head. So how to deal with it? In response to this problem, the crusher manufacturer gave us a detailed introduction.

Why choose a crusher with a hammer head

There are so many types of crushers on the market, including crushers with hammers and crushers without hammers. Some people say that since the hammer head is often worn, it is better to choose a crusher without a hammer head. In fact, although hammer crushers have the trouble of wear and tear, other crushers also have wearing parts, but they are not hammer heads.

Common crushers with hammers on the market include: impact crushers, hammer crushers, fine crushers, vertical compound crushers, etc. This kind of crusher with a hammer is generally an impact crusher. The aggregate produced has a better particle size and will be broken along the gaps in the ore. There are few cracks in the particles. The finished product is often cubic and has a high degree of gradation. Therefore, Many people will choose this kind of impact crusher with hammer head.

Reasons and solutions for the serious wear of the hammer head of the crusher

Vertical compound crusher

In order to solve the problem of serious wear of the hammer head of the crusher, it is necessary to find out the cause of the serious wear of the hammer head of the crusher and prescribe the right medicine. The main reasons for the serious wear of the hammer head of the crusher are the material of the hammer head, the manufacturing quality and structural design, the technical design of the crusher, the feeding situation and the clearance of each part of the structure.

Reason 1. Hammer head material

The hardness and toughness of the hammer head are one of the reasons that affect the wear of the hammer head. Generally, the greater the hardness, the greater the wear resistance of the hammer head, but as the hardness increases, the impact toughness of the hammer head will decrease. Therefore, the key to improving the wear resistance of the hammer head is to find a material with both hardness and good toughness.

Treatment method: choose the hammer head of high wear-resistant material, such as high manganese steel, high chromium cast iron, low carbon alloy steel, etc.

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For more detailed information about the solution to the serious wear of the hammer head of the crusher, please click to visit:https://www.zymining.com/blog/crusher-hammer-wear-treatment.html

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Introduction to the structure of the detachable garbage truck

The compartment detachable garbage truck can be equipped with multiple garbage bins according to actual needs. The vehicle is formed by adding a self-developed special top to the chassis of Aerospace Linghe. The work of the special devices is all hydraulic transmission, electronic control and manual operation. The working process of loading and unloading the garbage bins and dumping the garbage is realized by the extension and amplitude of the boom. The loading and unloading process is stable, safe, and has a high degree of mechanization. It has the characteristics of convenient operation and large loading capacity. It is an ideal urban garbage transportation tool.

The use of detachable garbage trucks can not only reduce the labor intensity of workers, but also prevent secondary pollution such as garbage flying and sewage dripping during loading, which has a positive effect on environmental protection and city sanitation.

Main structure introduction of detachable garbage truck

The upper part of the detachable garbage truck is mainly composed of a boom, a sub-frame, a detachable garbage compartment, a power take-off control device, a hydraulic system and a circuit. Loading and unloading of garbage bins.

Detachable garbage truck

Boom

The boom is composed of a hook and an L-shaped boom beam, which is connected to the subframe through a hinged shaft. At the same time, under the action of the hydraulic system and the circuit, the boom lifts and falls through the boom cylinder.

Subframe

The sub-frame is the main load-bearing frame of the detachable garbage box, which is composed of longitudinal beams, rollers, roller brackets, skateboards, boom brackets, cylinder brackets and other frame connectors. Among them, the rollers have the functions of supporting the car body and sliding guide.

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More detailed information about the structure of the detachable garbage truck can be accessed by clicking:https://www.ly-cimc-linyu.com/a/news/structure-of-detachable-garbage-truck.html

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What are the common types of belt conveyors?

Belt conveyors are usually used for conveying loose materials or finished items. Generally, the models and types are divided according to the conveying materials and the conveying process. In the following content, we have sorted out the four more common types of belt conveyors.

1. Mobile belt conveyor

The mobile belt conveyor is a continuous conveying and loading equipment with high working efficiency, flexible movement and good maneuverability. The mobile belt conveyor can design the use length and lifting height according to the actual situation such as the user’s conveying requirements. The general conveying height can reach 1.2-1.8m according to the belt width and conveying length.

2. Large angle belt conveyor

The freely expandable rubber corrugated vertical “skirt” is glued to both sides of the flat rubber conveyor belt, and the box-shaped bucket is formed by means of a transverse partition with a certain strength and elasticity glued between the skirts, so as to realize the material in the bucket. Medium and continuous conveying, this is the large inclination belt conveyor. In general, the large-inclination belt conveyor is suitable for dispersed powder, granular and fine paste and liquid materials, such as coal, gravel, limestone, sand, clay, sand sintering powder, sawdust, etc.

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More information about belt conveyors can be accessed by clicking here:https://www.zymining.com/conveying-machine/belt-conveyor

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