What are the common load forms of slewing bearings?

We all know that no matter what the bearing is, it will bear a certain load, and the slewing bearing is no exception. So, what is the load of the slewing bearing? What are the common load forms of slewing bearings? Today, the editor will introduce to you the common load forms of slewing bearings, hoping to help you understand more about slewing bearings.

1. What is the slewing bearing load?

It is only said that the load refers to the external force and other factors that cause the internal force and deformation of the structure or component, and the load of the bearing refers to the limit force that the bearing can bear under the action of the internal force and external force. The load is also called the load, which is used as a slewing bearing. Said that the types of loads it can bear include traditional radial and bearing loads, working loads, temperature loads, etc. The following editor will introduce these loads to you respectively.

2. Common load forms of slewing bearings

Slewing Bearings

(1) Radial and axial loads

In a rolling bearing, when the total plastic deformation is less than one ten thousandth of the diameter of the rolling element at the contact point between the rolling element and the raceway that bears a relatively large load, it has little effect on the normal operation of the bearing.

The static load capacity of the bearing determined under this plastic deformation condition is called the rated static load. The rated static load is determined under the assumed load conditions. For radial bearings, the rated static load refers to the radial load, and the radial load Thrust bearing (angular contact ball bearing) refers to the radial component of the load that loads the half-ring raceway in the bearing, and for a thrust bearing, it refers to the central axial load. The basic static load rating and basic static load rating of the bearing refer to the maximum load that the bearing can bear when it is static or rotating.

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Details can be accessed by clicking here:https://www.ldb-bearing.com/ldb-bearing-knowledge/slewing-bearing-knowledge/slewing-bearing-load-form.html

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Safety operation rules for high frequency dewatering vibrating screen

The normal operation of the equipment can only be ensured by operating the vibrating screen in accordance with the correct safety regulations during the use of the vibrating screen. Today, the vibrating screen manufacturer will introduce to you the safety operation regulations of the high-frequency dewatering vibrating screen that we need to abide by!

Precautions for the installation of high-frequency dewatering vibrating screen

Linear vibrating screen

(1) When the vibration exciter is installed and repaired, it shall not be beaten hard or have a different phenomenon, and ensure that the original bearing is used and shall not be interchanged.

(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 welded workpiece 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 performed on the side plate. Depending on the current environment, if connecting components are required, the side plate should be drilled and then connected with bolts.

(8) The universal joint must be concentric, and a protective device must be installed to prevent it from breaking and falling and hurting people.

Precautions for the use of high frequency vibrating screen

High frequency dehydration vibrating screen

1. Understand equipment related knowledge

The operator should ensure that the operator understands the scope of use and technical performance parameters of the equipment; has sufficient understanding and mastery of the structure, principle and common sense of maintenance of the equipment; familiar with the process flow and equipment control of the system; keep in mind the high-frequency vibrating screen Safe operating procedures.

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Details can be accessed by clicking here:https://www.hsd-industry.com/news/safety-operation-rules-for-high-frequency-dewatering-vibrating-screen/

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Looking for”oil”to sigh? Don’t worry! Learn about Linyu electric mixer truck!

From the overall trend, the development of new energy vehicles has become more and more mature, so is the tanker industry! Lingyu electric mixer truck has been well known by card friends. Now that the oil price has skyrocketed, it has also been put on the “must buy list” of mixer trucks. The editor will introduce a HOWO electric mixer truck to card friends this time. I believe everyone You will love this money maker!

electric mixer truck

Powerful and fast

Equipped with Ningde high energy density battery and permanent magnet synchronous motor, the efficiency is as high as 98%, the output power is stronger, and the cruising range can reach 260km.

electric mixer truck

Fast charging tank

The dual-gun DC charging can be fully charged in one hour, and the charging process will not stop the tank, ensuring that “money” will not stop.

electric mixer truck

Automatic cooling system

The motor and driver are intelligently dissipated, get rid of the high temperature and high consumption of the battery, and make users safer and more assured.

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Details can be accessed by clicking here:https://www.ly-cimc-linyu.com/news/electric-mixer-truck/

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Good car recommendation | Linyu liquid transport semi-trailer “comes with a roar of tigers”

After the spring rain, the sun is shining and the air is extraordinarily fresh. Recently, Linyu launched the “Tiger Roaring Kyushu” 100-day market battle. In order to meet more market demands, Linyu continued to innovate in product research and development. Today, I will introduce an ordinary liquid transport semi-trailer to card friends.

CLY9400GPG36 Ordinary liquid transport semi-trailer

1. New color, beautiful appearance, FRP head + aluminum alloy surface high-bright white acid and alkali-resistant paint, easy to clean, and improve the texture of the whole vehicle;

liquid transporter

2. The patented structure of the outer reinforcing ring, the scientific arrangement of the butterfly-shaped wave-proof board and the simple wave-proof board, the impact resistance effect is better;

liquid transporter

3. Through the optimized design of the frame and bracket, the center of gravity of the tank is reduced by 80mm, and the driving stability is higher;

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Details can be accessed by clicking here:https://www.ly-cimc-linyu.com/news/cly9400gpg36-ordinary-liquid-transport-semi-trailer/

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Introduction of Calculation and Measurement Method of Vibrating Screen Screening Efficiency

When using a vibrating screen, the screen has two important process indicators: one is the processing capacity, which is a quantitative indicator that indicates the screening work. Another is the screening efficiency, which is a quality indicator that indicates the screening work. Among the products on the sieve, the more the number of fine grades that do not pass through the sieve holes, the worse the sieving effect is. In order to quantitatively evaluate the completeness of sieving, the index of sieving efficiency should be used.

Screening efficiency of vibrating screen: It is an indicator of the working quality of the screen, indicating the degree of screening operation and the quality of screening products. It is usually expressed as a percentage by the ratio of the weight of the undersize product obtained during sieving to the weight of the fractions smaller than the sieve size contained in the raw material.

Because it is difficult to weigh the product of the screening operation in actual production. However, it is possible to perform sieving analysis on each product of the screening operation, thereby measuring the percentage of fine fraction weight of the sieve size through which the ore feeding, the under-screen product and the over-screen product pass through the screening operation. How to calculate the screening efficiency of vibrating screen?

Arc vibrating screen

The screening efficiency can be calculated by the lower ore screen: E=β(α-θ)/α(β-θ)*100%.

α——The content of the particle size smaller than the sieve size in the raw material;

β——The content of the particle size smaller than the sieve size in the product under the sieve;

θ——The content of particles smaller than the sieve size in the product on the sieve.

Example: a vibrating screen with a sieve hole of 15 mm, after sampling and sieving analysis, it is known that the 15-0 mm particle size accounts for 50% of the sieved materials, and the product on the sieve contains 8% of the particle size, and the sieving efficiency is calculated. how many?

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Details can be accessed by clicking here:https://www.hsd-industry.com/news/calculation-of-screening-efficiency-of-vibrating-screen/

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Four forms and maintenance skills of slewing bearing raceway failure

The failure of the bearing raceway will directly lead to the overall failure of the slewing bearing. The life of the slewing bearing raceway is affected by its own quality and later maintenance. Therefore, the daily maintenance of the slewing bearing raceway is very important.

When we find that the raceway fails, there are mostly five manifestations: large bearing clearance, oil leakage from the bearing, stuck running of the bearing, abnormal noise from the bearing, iron powder or iron lumps in the slewing bearing raceway. The four forms of track failure will be briefly introduced to you, and at the same time, I will share with you some daily maintenance skills for the slewing bearing raceway.

Four forms of slewing bearing raceway failure

Slewing Bearings

1. Surface peeling

The main reason for the surface peeling of the slewing bearing raceway is that the hardened layer is too thin and the hardness transition zone is too narrow. There are many reasons for contact fatigue failure, which may be excessive axial load, poor lubrication, poor alignment, excessive impact load during installation, etc., which can cause contact fatigue failure of bearings. Intermediate frequency equipment with lower frequencies should be used to deepen the hardened layer. At the same time, the quenched and tempered hardness should be appropriately increased to reduce the hardness gradient of the raceway section.

2. Corrosion pitting

The chemical or electrochemical reaction occurs between the metal surface and the environmental medium, and the surface damage caused by it is called corrosion failure. Corrosion is divided into three categories: chemical corrosion, electrical corrosion, and fretting corrosion, mainly manifested as the corrosion of the inner bearing surface of the bearing. The intrusion of corrosive medium, condensation of moisture in the air, sparks generated when the current passes, fretting and other factors can cause the corrosion failure of the slewing bearing raceway.

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Details can be accessed by clicking here:https://www.ldb-bearing.com/ldb-bearing-knowledge/slewing-bearing-raceway-failure.html

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How to choose the size of lift desks and chairs?

With the improvement of people’s living standards, desks and chairs have gradually been paid more attention to by the society, from simple wooden boards to desks and chairs that can now be raised and lowered. So what is the size of the current lift desks and chairs, how do we choose?

Dimensions of lift desks and chairs

Furniture for School Children

In fact, there is no fixed size of desks, and the sizes used by students of each age group will be somewhat different. Let’s take a look at the standard size of desks and chairs. Table and chair height standards for nine classes of students of different heights.

For example, if the height of the student is under 140cm, the height of the desk should be 52cm, the height of the empty area under the desk should be 40cm, and the height of the chair should be 29cm; the height of the student between 140 and 175cm, the height of the desk used should be 40cm. It is 67cm, the height of the empty area under the table should be 55cm, and the height of the chair surface should be 38cm. Moreover, according to the regulations, the forms of desks and chairs used in primary and secondary schools can be optional, but the main dimensions of the table height, the height of the empty area under the desk and the height of the chair surface must meet the home standard.

Lifting student desk size

1. Junior high school student desk size: 600mmx450mmx ( 780-690) mm Elementary school student desk size: 600mmx450mmx ( 750-660 ) ​​mm

2. Desktop size and requirements: 600mm x 400mm, the material is AA solid wood oak plug board with a thickness of 20mm, and the edges and corners of the desktop are arc-shaped.

3. Desk lift side plate: the upper part of the main body is 355mm wide, the bottom width is 240mm, the height is 368mm, the edge is 13mm, and the thickness is 1.2mm.

The student desks produced by our company have four levels of adjustment. The center distance of the fixing screw of each level of lifting holes is 60mm. Equipped with a PP engineering plastic hook, the hook does not exceed the desktop (to ensure the safety of the students), and there are reinforcing ribs on the edge and the middle part. The desktop and the main body are connected by self-tapping (at least 10 screws), and no wires are exposed.

4. Table legs: The horizontal legs at the bottom of the table are made of cold-rolled 25mm*50mm*1 4mm flat round steel pipes, and the bottom legs are 370mm long. The height of the double columns on the bottom leg is 400mm, the distance between the double columns is 35mm, and the outer column between the double columns on both sides is 80mm away from the bottom leg with a 465mm long flat round steel pipe 20mm*50mm*1.4mm to connect.

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Details can be accessed by clicking here:https://www.aoyangschoolfurniture.com/aoyang-news/lifting-desk-and-chair-size.html

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WHAT IS THE PROCESS FLOW OF THE HYDRATED LIME PRODUCTION LINE?

The hydrated lime production line is to crush the qualified hydrated lime blocks to a particle size of about 40mm by the jaw crusher, and send them to the hydrated lime storage tank silo through the bucket elevator. The digester performs preliminary digestion. When the hydrated lime completes the primary digestion, it enters into the Ⅱ-level digestion or the Ⅲ-level digester, so that the hydrated lime is completely digested and decomposed, and the qualified hydrated lime primary product is generated, and the digestibility reaches 98%. The design is divided into single-axis, double-axis and multi-axis models).

The digested and decomposed hydrated lime is then sent to the classifier by the semi-finished product screw conveyor, and the product impurities separation and fineness classification are completed by the powder classifier, and the final qualified product after the classification is completed. Warehouses are packaged separately. All polluted nodes of this production line are completed by pulse dust collectors, and the dust collection rate reaches 99.5%.

HYDRATED LIME PRODUCTION LINE EQUIPMENT COMPOSITION

15T installation site of Weinan Yaobai Cement Plant

Crushing System: Hammer Crusher

Conveying system: bucket elevator, conveyor

Digestion system: Qualified hydrated lime enters the digester for preliminary digestion. When the hydrated lime completes primary digestion, it enters into the secondary or tertiary digester to complete the digestion and decomposition of hydrated lime to generate qualified primary product of hydrated lime with a digestibility of 98%.

Slag discharge system: primary and secondary slag discharge, the slag discharge first discharges the impurities larger than 0.5cm in the semi-finished product, and then the secondary slag discharge discharges the components less than 0.5cm and sand and coal ash.

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Details can be accessed by clicking here:https://www.ly-gaifeng.com/blog/process-flow-of-hydrated-lime-production-line.html

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Correct operating procedures for agricultural tractors

In our agricultural planting, we must reasonably grasp the production efficiency and use our tractors reasonably so as to make our vehicle braking more flexible, so how should we operate correctly during the operation woolen cloth?

Start

1. After the tractor starts normally, observe the surrounding environment, and after confirming that there is no obstacle, close the door and send a signal.

2. Disengage the tractor clutch, push the shift lever into the appropriate gear, and shift the gear smoothly and accurately.

3. Gradually increase the accelerator while slowly engaging the clutch to make the tractor start smoothly. The process of engaging the clutch should be fast and then slow. After the tractor has moved away, the clutch pedal can be fully released. Do not step on the clutch pedal while driving to avoid early wear of the clutch friction plates

Variable speed

When a tractor is driving, with the change of environmental conditions, it is necessary to continuously change the driving speed. Whether the tractor can shift gears in a timely, accurate and rapid manner has a great influence on prolonging the service life of the locomotive, ensuring smooth driving and saving fuel.

1. Selection of gears

Changing the gear is actually changing the ratio of the engine speed to the transmission shaft speed. The lower the gear, the greater the speed ratio, and the greater the torque and traction. Conversely, the higher the gear, the less torque and traction you get.

During driving, when the movement resistance increases and requires large traction (such as uphill, heavy load, etc.). The low-speed gear should be selected; but the low-speed gear has low vehicle speed, high engine speed, fast temperature rise, and large fuel consumption, so the low-speed driving time should be as short as possible.

The medium-speed gear is a transition gear from low to high or from high to low, and is usually selected when turning, crossing a bridge or when it is difficult to pass. When the road conditions are good and the engine has sufficient power, the high-speed gear should be selected.

High-speed gear travels fast and saves fuel, but traffic safety must be ensured.

2. The operation of shifting from low-speed to high-speed

1) Refuel to increase the speed (rushing), the rushing should be stable, the rushing time varies according to the load of the locomotive, the rushing time is longer when the load is heavy, and the rushing distance of the high-speed gear is longer than that of the low-speed gear;

2) Lift the accelerator, step on the clutch pedal, and place the gear lever in the neutral position;

3) Engage the clutch, then disengage the clutch and quickly shift the shift lever to a higher gear;

4) Refuel smoothly and shift is completed；

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Details can be accessed by clicking here:https://www.syclutch.com/news/correct-operating-procedures-for-agricultural-tractors.html

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Detailed introduction and spectral range of LED grow lights

Light environment is one of the important physical environmental factors that are indispensable for plant growth and development. Controlling plant morphogenesis through light quality regulation is an important technology in the field of facility cultivation.

LED plant growth light is a kind of lamp that uses LED as the light source, and needs sunlight according to the law of plant growth.

LED grow light helps to shorten the growth cycle of plants, because the light source of this light is mainly composed of red and blue light sources, using the most sensitive light band for plants, red light wavelengths use 620-630nm and 640-660nm, blue light wavelengths 450-460nm and 460-470nm were used. It allows plants to promote the differentiation of multiple lateral branches and buds during the growth process, accelerate the growth of roots, stems and leaves, accelerate the synthesis of plant carbohydrates and vitamin synthesis, and shorten the growth cycle.

The large number of LEDs in vertical grow rack systems should indicate that LED grow lights are especially suitable for artificial light-controlled plant facility cultivation environments.

The color temperature and lumens of artificial light sources are seen by the eyes of living things, while the demand of plants for light is photosynthesis, which is determined by the radiation value regardless of color temperature and lumens.

Mobile vertical grow racks

The effect of spectral range on plant physiology

(1) 280~315nm––> This wavelength is already ultraviolet light, and it has the function of direct suppressive growth for the growth of various animals, plants and even fungi, and has minimal impact on the morphological and physiological processes.

(2) 315~400nm––> This kind of light wave is also far-ultraviolet light. Although there is no ultraviolet light to harm plants, it has no direct effect on plant growth, and the absorption of chlorophyll is small, which affects the photoperiod effect and prevents stem elongation.

(3) 400~520nm (blue) –> Such wavelengths can directly develop the roots and stems of plants, and have the largest absorption ratio of chlorophyll and carotenoids, and have the greatest impact on photosynthesis.

Details can be accessed by clicking here:https://www.etegreen.com/blog/introduction-of-grow-lights/

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