Concrete mixer trucks are very common in construction projects. The boom in the real estate industry has accelerated the development of concrete mixer trucks. The market for concrete mixer trucks is getting wider and wider, and more and more users want to buy mixer trucks. What problems should be paid attention to when mixing trucks?

1. Choose the right load

This mainly refers to the choice of tank volume. For example, a mixer truck with a large loading capacity has high transportation efficiency, but the corresponding cost is also high. It is said that the loading capacity of the first four and eight-wheeled mixer trucks is higher than that of the rear eight-wheeled mixer trucks. It is much larger, but the price of the first four and the eight-wheeled mixer is 30%-40% more expensive than that of the latter eight-wheeled mixer. If the construction site you are working on is relatively small and the road is narrow, then choose a smaller mixer; if The construction site you are working on is larger, so choose a larger mixer truck, which has a larger carrying capacity and a relatively higher profit. In short, a suitable mixer truck can do more with less.

Concrete mixer trucks

2. Material selection

The mixer truck is afraid of failure during transportation. If there is a failure during transportation, it will cause concrete to coagulate. If it is serious, the tank may be scrapped, so pay attention to the selection of materials. It is better to choose imported mixer trucks, reducers, hydraulic motors, radiators and other components. If economic conditions permit, small mixer trucks are better to choose imported ones, so that the quality can be guaranteed.

3. Select a reasonable structure design

Reasonable structure design can ensure convenient operation. Concrete residue is easy to accumulate in the mixing tank. After a long time, the effective volume of the tank will be reduced, and it will be more laborious to clean up.

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Gear forgings, as the name suggests, are a kind of gear produced by forging technology. The performance of gear forgings will be more stable, and the damage rate will be reduced a lot during operation, so the demand for gear forgings is very large.

Gear forgings are also a kind of forging products. When forging, it needs to be carried out according to the rules. At the same time, some hard technical requirements need to be met. Now forging manufacturers will introduce the technical requirements of gear forgings.


1. The allowance size of gear forgings should conform to national standards.

2. Gear forgings should ensure a suitable forging ratio during forging, and should not be forged with round steel of similar size.

3. Do not use billet forging.

4. The material of gear forgings should be consistent with the material of the parts, and the chemical composition should meet the national standard. And issue a bill of materials.

5. To ensure normal forging temperature, not forging at low temperature or over-burning.

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The excavator is one of the most important equipment in modern engineering construction. The reason why the excavator can turn left and right during work is inseparable from the credit of the slewing mechanism, which is an important part of the excavator.

The slewing mechanism is connected with the traveling device through a slewing bearing, and the slewing drive device makes the platform rotate relative to the traveling device, and drives the working device to rotate around its central axis of rotation. Next, the slewing bearing manufacturer will tell you about the existence and working principle of the excavator slewing bearing, hoping to help everyone.

Existence form of slewing bearing

slewing bearing

1. Rotary column slewing bearing

In the structure of the rotating column slewing bearing, the rotating body and the supporting shaft form a rotating column, which is inserted into the bearing of the bearing seat. The bearing housing is bolted to the frame. The shell of the swing cylinder is also fixed on the frame, and its output shaft is inserted into the lower bearing. The rotating body is driven to rotate relative to the frame. The working device is hinged on the rotating body and rotates with the rotating body, and the rotation angle is not more than 180°.

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The accuracy of cylindrical roller bearings increases sequentially from 0. For general use, 0 is sufficient, but when used in special conditions or occasions, a precision of 5 or higher is required. Although the above accuracy is based on the ISO standard, its name is different in each standard. The following lists the applicable accuracy of various cylindrical roller bearing types and the comparison between the standards.

Dimensional accuracy

1. Allowable deviation of inner diameter, outer diameter, width and assembly width;

2. The allowable deviation of the inner diameter of the complex circle and the diameter of the outer circle of the roller group;

3. The allowable limit value of the chamfer size;

4. The allowable variation of the width and the rotation accuracy;

5. Allowable radial runout and axial runout of inner ring and outer ring;

6. The allowable lateral runout of the inner ring;

7. The allowable variation of the inclination of the outer diameter surface;

8. The allowable variation of the thickness of the thrust bearing raceway.

Crossed Roller Bearings

Standard cylindrical roller bearings have many sizes and forms. Standard bearings are used in the design of mechanical devices. The nature, size and direction of the load of cylindrical roller bearings and the load applied to the bearing are changeable. Usually, the rated base load is shown on the dimension table. However, axial load and radial load, etc., are also important factors in choosing a suitable cylindrical roller bearing.

When the ball and needle roller bearings are of the same size, needle roller cylindrical roller bearings usually have higher load capacity and withstand higher vibration and shock loads. The allowable speed is determined according to factors such as the type, size, accuracy, cage type, load, lubrication method, and cooling method of the cylindrical roller bearing. The allowable rotational speed of standard precision bearings under oil lubrication and grease lubrication is listed in the cylindrical roller bearing table. Generally, deep groove ball bearings, self-aligning ball bearings and cylindrical roller bearings are suitable for high-speed operation.

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Plant seedling cultivation is a very critical link in plant growth. Currently, there are special plant growth racks for plant cultivation, which can provide good environmental conditions for plant growth. In the process of plant breeding and crop breeding, there are many ways to accelerate the growth rate of plants, one of which is to extend the plant light time, combined with early harvesting of seeds, so that seeds can iterate quickly, thereby reducing the growth of some long-day crops or day-neutral plants cycle.

The plant growth racks adjust temperature, humidity and other parameters through an intelligent control system. The human-machine interface adopts an industrial color hand-touched LCD screen, and has various functions such as program control, light control, temperature control, and sterilization, which can be used to study environmental conditions. The influence of biological life activities and the cultivation, domestication and breeding of certain organisms. The plant growth rack mainly includes a central control system, an enclosure structure, a temperature and humidity system, an intelligent fresh air ventilation system, a lighting system, a cooling system, etc.


1. Central controller: PLC programming, with over-temperature alarm, remote alarm, monitoring, mobile APP real-time viewing, reset, etc.

2. Enclosure part: hexahedral double-sided color steel/stainless steel polyurethane high-density B1 environmental protection insulation material; the ground is made of environmentally friendly non-toxic materials, moisture-proof and mildew-proof.

3. Constant temperature and humidity control system: The new dynamic constant temperature and humidity control system has fast response and high precision.

4. Arbitrary setting of temperature and humidity: Arbitrarily set temperature and humidity control parameters automatically form a local microclimate environment.

5. Fresh air ventilation system: It can be ventilated regularly, with fresh air from the bottom and exhaust from the top.

6. Air curtain isolation system: prevent the exchange of internal and external air flow to save energy consumption.

7. Internal circulation ventilation and humidification system: make the air supply and humidification in the warehouse uniform, and there will be no large temperature deviation in local areas.

8. Lighting system: LED grow lights can be tailored to specific plant growth habits, with long life and high light efficiency.

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The high-speed automatic valve bottom paper bag paper tube machine is a linkage production line. The tube making machine is used to produce medium-sized stepped bottom bag tubes and straight-cut bag tubes. It needs to be used in conjunction with the bottom gluer to complete the entire valve bag. production process.

The bottom paste paper bag has low cost and high strength. It is widely used in the packaging of powdery and granular materials such as cement, chemical raw materials and grains. The paper tube machine is composed of multiple production control systems. Next, the paper tube machine manufacturer will introduce to you in detail what are its production control systems?

Features and functions of production control system of paper tube machine

HD100-ID Square Bottom Machine

1. Automatically correct the deviation of the paper

The paper feeding automatic deviation correction system is to make the paper edge of each layer of bag automatically run at the set position, to ensure the accuracy of the trapezoidal incision of the bag tube and the position of the glue, and it is an important automatic control function to ensure the quality of the bag tube and the glued bottom bag.

2. Automatic brake on paper break

When paper breaks occur at the paper holder, virtual cutting and the entrance of the main machine, emergency automatic braking is realized, which effectively avoids the phenomenon of traffic jam caused by untimely detection of paper breaks, shortens the processing time of paper breaks and reduces paper waste.

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Calcium hydroxide production line is a kind of chemical equipment that uses dry method to produce calcium hydroxide, which has the advantages of energy saving, environmental protection, large output, etc. What are the design principles of calcium hydroxide production line?


When designing calcium hydroxide equipment, it is necessary to use decomposable, non-toxic and pollution-free materials that meet environmental protection requirements, use environmentally friendly renewable materials as much as possible, avoid the use of harmful materials containing resin and asbestos, and at the same time ensure the performance of the equipment. In order to reduce the use of additional materials, the design should be concise, reduce the waste of energy and reduce the weight of the equipment.

15T installation site of Weinan Yaobai Cement Plant


Since the users of environmental protection equipment are all front-line workers, the design process of calcium hydroxide equipment should be people-oriented. The control room adopts sound insulation, shock absorption and thermal insulation materials to ensure the sealing performance and environmental protection performance of the control room, and the air conditioner adopts fluorine-free air conditioner. Each lever must be set in a reasonable position, fully considering the purpose of humanization.

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In the mine production site, vibrating screen is a common equipment, which needs to screen and dehydrate materials. Since it is a large-scale equipment and the workload of the equipment is large, the maintenance work of the vibrating screen should be done well at ordinary times, and the lubrication and maintenance can ensure the normal production and operation of the vibrating screen. So what kind of lubrication is used for the vibrating screen? Generally, there are two types of lubrication, oil lubrication and grease lubrication. The following editors from Hiside will give you a detailed introduction.

1. Lubrication method of vibrating screen

Oil lubrication of vibrating screen

Lubricating oil has strong fluidity and dispersibility, so the oil-lubricated seal needs to be safe and reliable. The sealing device is more complicated than grease lubrication, and it is more difficult to disassemble and maintain. Oil lubrication is generally suitable for bearings operating at high speeds or in environments with high bearing temperatures. Commonly used oil lubrication methods include oil bath lubrication, circulating oil lubrication, drip oil lubrication, oil injection lubrication, and oil and gas lubrication.

Grease lubrication of vibrating screen

Grease has the characteristics of strong adhesion, not easy to run off, and good pressure resistance. Due to the weak fluidity of the grease, the grease lubricated sealing device is relatively simple, the disassembly and maintenance are more convenient, and a special oil supply system is not required. Grease lubrication is generally suitable for work in low and medium speed and moderate temperature environments. Commonly used greases are calcium-based grease, sodium-based grease, aluminum-based grease, general-purpose lithium-based grease, extreme-pressure lithium-based grease and molybdenum disulfide extreme-pressure lithium-based grease.

Banana screen

2. Characteristics of vibrating screen lubrication method

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In modern industrial production, in order to save raw materials, various equipment in various industries emerge in an endless stream. As an important equipment for processing and reusing residual materials, briquetting machine will inevitably experience various wear and aging during use. Important working components in the briquetting machine Roller skins are often worn out and replaced.

The roller skin is a cylindrical component with ball sockets dug on the surface of the roller core of the ball press. Usually, the material is pressed by hydraulic drive rollers, which are formed by the ball sockets of the roller skin. As a very easy to wear ball press component, Frequent replacement is unacceptable for the operator, but the worn roller skin of the ball press cannot meet the production demand, and it is not enough if it is not replaced, so it is very important to maintain the roller skin during use. What is the maintenance method of the roller skin?

1. The installation of the roller skin of the briquetting machine should be correct

There are four installation methods for the roller skin of the ball press. Different ball presses use different methods, but the installation standards are the same. First of all, the installation of the roller skin cannot be dislocated. If the roller skin is already dislocated during installation, then Not to mention production, the shape of the ball socket on the roller skin must be aligned, otherwise the ball press will not produce balls, loose balls, and the spherical shape is not true. The edges of the nests wear each other, and the roller skins need to be replaced after a long time, which is not worth the loss.

briquetting machine

2. Do a good job of protection before the briquetting machine works

The common steel for the roll skin of the casting ball press is 65 manganese alloy, and the common steel for the roll skin of the forging ball press is 92 chromium molybdenum. Our company uses a higher-level forging – bearing steel. Casting roller skins are relatively not wear-resistant, but the advantage is low cost. Some operators are not bad at money, and it is not a big deal to replace the roller skins frequently. However, for operators who use forged roller skins, the more durable the roller skins, the better. It is better not to replace it, but it is not necessary to maintain the roller skin of the ball press.

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The tractor clutch is through the operating mechanism, relying on the friction between the main and driven components, to temporarily separate or gradually connect the engine and the transmission to transmit power, facilitate shifting, ensure a smooth start of the tractor, and prevent damage to parts caused by overloading. During the use of the tractor, many drivers cannot use and maintain the clutch properly, and do not realize the importance of correct adjustment of the clutch. Often due to improper adjustment of the use and operation, the early wear of the clutch and the damage of the transmission parts are caused, which reduces the service life. In order to reduce the failure of the clutch and prolong its service life, it must be used and adjusted correctly.

Correct use and maintenance

(1) When using the clutch, do it quickly and completely when disengaging, and slowly release the pedal when engaging. When the tractor starts, release the pedals quickly. Obstacles and rough terrain cannot be overcome by slamming the clutch pedal.

(2) The time for stepping on the clutch pedal to separate should not be too long, generally not more than 15 to 20 s. If you need to stop for a long time, the gear lever should be in the neutral position and the pedal should be released.

(3) Do not habitually press your feet on the pedals. When driving, do not step on the clutch pedal at all times except for starting, shifting and braking at low speeds. Otherwise, the clutch is often engaged, disengaged or semi-slipped, which will accelerate the wear of the clutch friction plate and pressure plate.

(4) Try to avoid starting with a heavy load. When the tractor starts with a heavy load, the clutch is prone to serious slippage, which generates frictional heat and burns, cracks, warps and deforms the pressure plate and driven plate of the clutch, and the compression spring is annealed. The asbestos friction plate is generally within the working temperature of 400 ℃, and the friction coefficient above this temperature decreases with the increase of temperature. Therefore, during heavy-load operations, if the ploughed land encounters local resistance changes, it is necessary to shift gears in time, and the plow should be slightly lifted before starting to reduce the starting resistance.

(5) When stopping normally, the accelerator should be closed first, then the clutch should be disengaged, and the brake should be properly used to make the locomotive stop smoothly; when stopping in an emergency, the accelerator should be quickly closed, and the brake pedal should be quickly pressed, and then the clutch should be disengaged. The double-acting clutch can operate the PTO handle only after the second-stage friction plate is disengaged.

(6) In use, the friction plate adheres to oil, which will cause the clutch to slip; the clutch will be immersed in muddy water, which will cause the parts to rust. At this time, the clutch must be disassembled, the muddy water should be wiped off with cotton yarn, the oil stains and rust spots should be cleaned with gasoline, and the friction plates should be reassembled after drying in the shade or drying (no drying is allowed). When the clutch assembly is installed on the flywheel of the engine, it is best to use a mandrel for positioning, which can ensure the concentricity of the center of the clutch friction plate and the first shaft, and make the gearbox and the engine assemble smoothly.

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