Oil-containing nylon has been widely used in rubber metallurgy, paper, textile and mining industries, etc. It is used to make parts such as slider gear bearings, and solves many technical key problems. However, it can be used as a transmission nut for heavy-duty car lifts. The factory proposed to use new materials to extend the service life of the nut. The author conducted an analysis and test on the oil-containing nylon nut to confirm that the oil-containing nylon nut was completely used as the transmission nut of the heavy-duty car lift, thus opening up a new application field of oil-containing nylon mechanical car. The performance of the lift on the nut performance The working principle of the lifter The working principle of the double-column mechanical car lift is shown in the figure. The motor drives the main screw through the belt drive, and the main screw drives the secondary wire through the chain drive at the lower end. The rod rotates at the same speed, and the working nut and the lifting carriage thereon are synchronously lifted and lowered. The lifting mechanism connected to the lifting carriage realizes the lifting movement of the automobile. The performance of the working nut requires the structure of the mechanical automobile lifting machine. Not complicated, its main drive is actually a screw drive.
The core working component is the screw nut mechanism. The height of the nut itself is usually less than two. It is required to lift the car with at least the mass to the height of the left and right. The nut is wear-resistant. Whether it can withstand heavy load for a long time is directly related to the repaired car and vehicle maintenance. The industry standard of the Ministry of Safety and Traffic of the Workers stipulates that the mechanical car lifter shall not fail during the whole process of reciprocating work in the rated lift quality of the load, and continue to run to the next time on a non-fault basis. It is safe and reliable to check the damage of components.
Permitted to replace consumables The consumables mentioned in the standard mainly refer to a pair of screw rods on the nut day, a column drop carriage, a screw, a safety nut, a wheel, a chain, an i-column lifting carriage motor. Small pulleys, one belt, one person, one wheel, one screw, one working principle of the January lift. Because the screw drive is sliding friction, the frictional resistance is large, and the transmission efficiency is low (generally one and wear fast) to protect the screw.
Most lift manufacturers use bronze with relatively low wear resistance and low hardness (for example, as a nut material, forming a pair of bronze-to-steel friction pairs, but to achieve the desired effect, the pair of friction pairs must remain Lubrication state factory work, the working environment of the ten lifts is relatively harsh, and most auto repair shops can not be clearly used and maintained by the car, can not guarantee that the screw nut friction pair works in the lubrication state, resulting in increased nut wear, the lift is not used To two years.
As a result of the crash of the bronze nut, it is obvious that under the premise of ensuring the bearing strength of the nut, the self-lubricating performance and wear resistance of the nut material are improved, which is the preparation of the key oil-containing nylon nut which prolongs the service life of the nut. Preparation of oil-containing nylon nut blanks In the preparation process of oil-containing nylon, the key is the modulation of the application of the oil compound date illusion Wang Qi oily nylon nut in the car lift. The specific modulation method is in the selected high temperature lubricating oil system. Adding a surfactant with a mass fraction of about 10 and an appropriate proportion of oil-soluble pigment, mixing the mixture at a high speed until the solution is uniform (the layer should not be layered after standing). The flow chart of the preparation process of the oil-containing nylon is shown in the figure.
Catalyzed hexamethyleneamine monomer heating fish county room åˆ, heating vacuum dehydration oily nylon products 庵 庵 厂 令 令 一 一 一 一 åŒ åŒ åŒ åŒ åŒ åŒ åŒ åŒ åŒ åŒ ' ' ' ' ' ' ' 一 一 一 一 一 一 一Flow chart of the performance of oil-containing nylon and bronze materials. The prepared oil-impregnated nylon nut blanks were sampled according to national standards, and the main performance indicators were compared with the performance of commonly used bronze materials. The test results are shown in the table. Performance of oil-containing nylon and common bronze materials. Contrast one factory one stone one oily nylon several yin tensile strength eight E-shirt compressive strength impact strength one hardness one in the friction coefficient constantly i i oil-like nylon nut and bronze nut performance comparison from the table can be seen, oily nylon pull The tensile strength is much lower than the tensile strength of the bronze material, but it is not the transmission nut of the lifter. However, for the study of the oil-containing nylon nut, we use the one-type lift with rated lifting quality as the test object. The thread size of the nut is squeezed. The oil-impregnated nylon nut and the bronze nut are respectively used.
The bearing performance was compared and tested. The results are shown in the table. Performance comparison between oily nylon and common bronze materials. Item Oily nylon nut, bronze nut, heart weight, heavy lifting, normal use, nut root fracture, not high relative to a nut, The nut screwed on the screw rod is subjected to the impact test. Under the rated load, the motor can be lifted and stopped for lifting test. When the static load test is loaded, when the nut is loaded, the nut is broken due to the lifting device, and the shape cannot be used. Further loading, but the nut can still use the pitch machining error, while the number of bolts carried is small, so that the actual load bearing capacity is reduced. Second, the dry friction coefficient of the oil-containing nylon nut is relatively small, so the friction is small.
Life test under rated load According to the test method specified by the Ministry of Communications industry standard, the lifting test of a type two-column mechanical car lift is carried out under rated load conditions. When lifting to the upper limit height, the rated load is In the mid-air stop, when you drop to the lower limit position, you can continue to carry out such lifting movements. The grease is allowed in the industry standard. However, considering the actual use of the garage, the test is about every time. The rod nut is filled once and the mechanical lubricating oil has been tested. It is found that the oil-containing nylon nut is particularly wear-resistant, and its service life can reach more than two times, which is far greater than the repeated requirements specified in the industry standard of the Ministry of Communications of the People's Republic of China. The secondary levels are close, and the same test conditions, the service life of the bronze nut () is less than the second.
The test also found that the oil-containing nylon nut itself has low hardness and can effectively prevent the wear of the hard dust particles on the screw.
Moreover, the oil-containing nylon nut will not come out in the oil-loss state during the running process.
The influence of the size of the oil-filled nylon nut on the performance of the lift under no-load conditions. According to the conventional machine design, there should be a certain gap between the size of the screw and the nut of the screw drive, and the teeth of the machine screw and nut. The schematic diagram of the type structure is shown in the figure and the threaded rod and nut are processed in the process of no-load test of the lift.
When the lifting device is lifted to a certain area.
The phenomenon of lateral vibration of the screw rod occurs only on the lift using the oil-containing nylon nut. It can be seen from the table. Whether it is static or dynamic, the oil-impregnated nylon nut has better performance than the bronze nut. We believe that the main reason There are two points. The oil-impregnated nylon nut has good toughness. During the load-bearing process, the thread is deformed, the screw moment error is eliminated, and all the nuts of the nut are carried. The bronze nut is a small rod of a screw and a screw. The diameter of the screw rod is the size of the large diameter of the screw. The schematic diagram of the tooth structure of the screw and nut of the machine tool adopts the oil-containing nylon nut. The lift is in the no-load state, and the engineering plastics are applied for many years, the first volume, the first phase. The lateral vibration of the screw rod has been analyzed for a long time. We found that the length of the screw itself is above the length, which is equivalent to a string. Any lateral incidental factors will stimulate the lateral vibration. Moreover, the screw has a linear error oily nylon nut. The friction coefficient is low, and it has a certain compression deformation under load, and there is a large pitch error when turning.
For the above analysis, we use the machinability of oil-containing nylon material, and the original turning nut is changed to the tap made by the screw size to machine the nut, so that the screw and the nut are exactly the same in the size of the tooth, and the size and size are the same. And the pitch error is reduced to a minimum value, so that the oil-containing nylon nut maintains the damping characteristic under the no-load condition of the lift, thereby effectively eliminating the no-load vibration phenomenon.
Economic Benefit Analysis Oil-containing nylon nuts have excellent performance, light weight and long life, and their price is only half of the price of bronze nuts. The economic comparison of oil-impregnated nylon nuts and bronze nuts is shown in the table. Oil-containing nylon can be used not only as a slider gear bearing. As well as other structural members and moving parts, and in the case of the nut type of the nut, the item price is only one. The service life of the nylon nut and the bronze nut is compared. The oil-containing nylon nut bronze nut extension size is slightly improved. After that, it can also be used as a transmission nut under heavy load operation.
A series of mechanical car lifts have stable performance and a significant increase in life after the use of oil-impregnated nylon nuts.
The oil-containing nylon nut products have passed the performance test of the Ministry of Communications according to industry standards and the safety certification of the European Community. They have been mass-produced and exported to the United States, Japan, Germany, France, Thailand, Canada, Singapore, Sudan, and more than 20 countries and regions. Zhang Jilin.
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