The vibrating screen is a screening equipment often used in the sand and gravel industry. It uses the exciting force generated by the exciter to screen the material, which is convenient for the next production of the material. However, the vibrating screen does not run continuously for 24 hours. When the production is not in use, the vibrating screen equipment must be shut down. Sometimes when it is restarted, it may be difficult to start. Then when the vibrating screen starts What about difficulties?

Reasons for the difficulty in starting the vibrating screen

Arc vibrating screen

1. The exciter is faulty

The common reason for the difficulty in starting the vibrating screen is the failure of the vibrating screen. When the vibration exciter parts are working, it is necessary to ensure a good lubrication state, not only high-efficiency lubricating grease, but also preventing the lubricating grease from thickening, solidifying, and agglomerating, so as to play its due lubricating function.

Solution: Check the lubrication of the exciter and replace the appropriate lubricating oil.

2. Power failure

Check if the power supply is faulty, and then check the current of the motor. If the motor is faulty, you need to replace the new motor components; the assembly line of the vibrating screen is composed of centralized control circuits. When some components are damaged, it must be timely. Replace with new components; sometimes the voltage is unstable, and the voltage at startup is lower than the rated voltage, which is prone to failure.

Solution: replace the new motor parts; ensure the voltage stability during the working process of the vibrating screen.

3. The vibrating screen itself is faulty

Once again, the linear vibrating screen equipment itself has malfunctioned. Due to the large change in the supply flow of the material, the feeding amount of the linear vibrating screen exceeds the specified feeding value, causing the material to form a blockage on the screen surface. When the material accumulates to a certain amount. , The working load of the linear vibrating screen is large, which makes it impossible to start normally.

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Most industrial production requires burning coal to obtain a high-temperature production environment. In order to improve the combustion performance of coal, briquette is basically used. The briquette can better meet the needs of industrial production in terms of strength and durability.

But not all the briquette pellets pressed by the briquetting machine can meet the requirements, and their performance is easily changed by the adjustment of the equipment parameters. How to measure the performance of the briquette machine?

1. Pellet forming principle of briquette briquette machine

briquetting machine

Driven by the motor, the pair of rollers of the briquette briquetting machine rotate in opposite directions at the same speed. When the material falls between the two pairs of rollers, it begins to be compressed at the junction. At this time, the material is compressed in volume between the corresponding two ball sockets. ; The rollers rotate continuously, the ball socket is gradually closed, and the forming pressure gradually increases. When the distance between the two ball sockets is minimum, the forming pressure reaches the upper limit.

Then the rollers are rotated to gradually separate the ball sockets, and the molding pressure decreases rapidly. When the forming pressure is reduced to zero, the pressed briquette begins to expand and break away.

2. Determination method of pellet performance of briquette briquette machine

Medium Pressure Briquette Machine

(1) Cold strength:

Randomly select 10 briquette pellets and place them on the particle strength testing machine one by one for pressure feed test, record the pressure value indicated when each briquette pellet cracks, and calculate the average value, the unit is N/ball. The average error is valid in the range of +50N, ​​and the ambient temperature is 25 degrees Celsius.

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2-6 cubic concrete mixer trucks are collectively referred to as small concrete mixer trucks. At present, mixer trucks are an indispensable professional transportation tool for urban construction roads, bridges, houses, water conservancy projects, mixing stations, etc. Small concrete mixer trucks have the characteristics of narrow body, short wheelbase, small turning radius and other personalized design, and have strong advantages in the working environment of limited height, width and length.

Mixer truck

As a special vehicle for transporters, small concrete mixer trucks must comply with relevant regulations in terms of maintenance and repair, and implement the maintenance system of “regular inspection, compulsory maintenance, and repair as appropriate”. Under this premise, combined with the actual situation of the concrete mixer truck, maintenance and repairs should be done well. In terms of maintenance, in addition to the routine maintenance of the car engine, chassis and other parts, the coagulation king mixer truck must also do the following maintenance work.

Since the concrete will solidify into a hard block in a short time, and it is corrosive to steel and paint, after each use of the concrete king storage tank, cleaning the concrete adhering to the concrete storage tank and the inlet and outlet is mainly Daily maintenance must be done carefully. These include:

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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

Excavator slewing bearing

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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In recent years, with the development of science and technology, crossed roller bearings have become an indispensable part of precision science and technology research. According to the survey, about 60% of domestic bearing orders come from imported bearings. In addition to the trust in the popularity of imported products, the variety of products, high precision and wide adaptability are also advantages that products cannot overcome. Throughout the internal bearing manufacturers, most of the varieties are not or not refined, resulting in the production of bearings not recognized.

As one of the imported bearings, how to properly lubricate the bearings is an important part of bearing maintenance and maintenance during normal operation.

Cross Roller Bearing

1. Oil bath smooth

Oil bath lubrication is a common lubrication method in thin-walled crossed roller bearings, suitable for the lubrication of low and medium speed bearings. The bearing is partially immersed in the groove, and the lubricating oil is brought up by the rotating bearing parts, and then flows back to the oil groove. The oil level should be slightly lower than the center of the rolling element.

2. Drip oil and smooth

Oil dripping lubrication is suitable for thrust cylindrical roller bearing components that require quantitative supply of lubricating oil. The amount of oil dripping is preferably every 3-8 seconds. Too much oil will cause the bearing temperature to increase.

3. Circulating oil to lubricate

The filtered oil is transported to the crossed roller bearing by the oil pump, and the lubricating oil after passing through the bearing is filtered and cooled before use. Because the circulating oil can take away a certain amount of heat and cool the bearing, this method is suitable for bearing parts with high rotation speed.

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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.

K series

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.

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Concrete mixer trucks are engineering vehicles that transport concrete on construction sites. They come and go. In order to ensure the long-term and normal use of concrete mixer trucks, the owners and friends do not forget to maintain it daily. Next, the tank truck manufacturers will tell you about mixing. The maintenance of the gearbox in the daily maintenance of the car.

1. Always check whether the transmission oil level is normal.

Concrete mixer truck

To check the transmission oil, you need to preheat the oil to about 50 ℃, and then put the gear lever in each gear for 2 seconds and then put it in the parking gear. At this moment, the normal oil level of the oil dipstick should be located between the high and low lines. If it is not reached, the same quality of oil should be added in time.

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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

briquetting machine

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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The vibrating screen can only be operated in accordance with the correct safety regulations in the process of use to ensure the normal operation of the equipment. Today, the vibrating screen manufacturer will introduce to you what are the safety operation regulations of the high-frequency vibrating screen that we need to abide by!

Precautions for the installation of high-frequency vibrating screen

Linear Vibrating Screen

(1) When the vibration exciter is installed and repaired, it must not be beaten hard or be different, and ensure that the original bearing is used and not interchangeable.

(2) The thickness and quantity of the eccentric block or counterweight plate attached to the eccentric block must be the same, and the radial clearance of the bearing should be C3 grade.

(3) The connection between the universal joint and the vibration exciters on both sides must be concentric, the eccentric blocks on both sides are in the free plumb position, and the universal joint connecting bolts can pass through smoothly; if there is any deviation during installation, check the universal joint Whether the joints at both ends of the section are concentric, do not swing the eccentric block angle for installation.

(4) The vibrating screen should be installed with springs with the same stiffness. The spring stiffness on both sides of the feeding end and the discharging end should be as consistent as possible, and the allowable height difference does not exceed 3mm.

(5) Both sides of the support seat of the rubber spring of the vibrating screen should be in the same horizontal plane, and the error is between 2-4mm to ensure that the materials on the screen surface advance evenly.

(6) When using electric welding to install or disassemble parts, the ground wire must be directly fixed on the workpiece to be welded and as close as possible to the welding point, and the welding current must not pass through any bearings or joints.

(7) In principle, welding should not be carried out on the side plate. According to the current environment, if connecting components are required, the side plate should be drilled and then connected with bolts.

(8) Universal joints must be concentric, and protective devices must be installed to prevent them from breaking and falling out and hurting people.

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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

Slewing Bearings

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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