Device and method for testing wear resistance of nonmetal mud scraper chain

Abstract

The invention discloses a device and method for testing wear resistance of a nonmetal mud scraper chain, the device comprises a pool body and a support, the support is provided with an air cylinder, a motor system and a main shaft, the main shaft comprises a front shaft and a rear shaft, and a traction chain wheel on the front shaft and a traction chain wheel on the rear shaft are cooperatively provided with a traction chain to be tested; the method comprises the following steps of: numbering and measuring chain link and bolt samples of the traction chains to be tested before and after testing, and calculating the actual abrasion loss of each traction chain to be tested according to a data difference. The device can conveniently simulate the operation condition of the sludge scraper chain in an actual sewage treatment plant, the measurement is more accurate and effective, and the method can conveniently and quickly calculate the actual abrasion loss of each chain, so that the service life of the chain can be conveniently predicted, the chain can be timely maintained and replaced, the operation cost is reduced, and the working efficiency is improved. Overall management is facilitated, and the practical effect is good.

Description

Technical Field

[0001] The invention relates to the technical field of scraper chain wear resistance testing, and in particular to a device and method for testing the wear resistance of a non-metal scraper chain. Background Art

[0002] In the sewage treatment process, the sedimentation tank is one of the basic units of the entire treatment process. The sludge and sediment in the sewage settle in the sedimentation tank, and the scum floats on the water surface. The chain-type scraper system installed in the sedimentation tank continuously scrapes away the sludge at the bottom of the tank and removes the scum on the water surface. The scraper system is generally composed of traction chains, sprockets, drive chains, scrapers, drive shafts and drive motors, among which the traction chain and drive chain are the core. Non-metallic materials are widely used in the production of these scraper chains due to their light weight, high specific strength, strong corrosion resistance and easy installation.

[0003] After the scraper has been running for a period of time, people usually find that the non-metallic chain has different degrees of wear, which will cause the chain to break. The wear of the chain mainly occurs in the friction between the chain link and the sprocket during the meshing process, and the wear caused by the relative rotation of the pin and the chain link. This wear will vary depending on the sludge and sediment content in the sewage and the size of the chain tension, which directly affects the service life of the chain. So far, there is no device or method at home and abroad that can simulate and detect this wear and thus predict the service life of the chain. Although there are standards such as GB / T3960, ISO9352, ASTMD1044 and ISO15527 for non-metallic material wear tests, most of these standard wear tests are based on the wear measurement between a small piece of material and a device such as a wear disk in the laboratory, which is completely irrelevant to this wear during the operation of the scraper. Many sewage treatment plants can only regularly drain the sedimentation tank to observe, maintain and replace the chain based on experience. Some sewage treatment plants even use data from nearly 20 years of operation to predict the service life of the chain, which undoubtedly greatly increases operating costs and inconvenience. Summary of the invention

[0004] In view of the problems existing in the prior art, the purpose of the present invention is to provide a device and method for testing the wear resistance of non-metal scraper chains. The device is composed of a traction chain to be tested, a traction sprocket, a driving sprocket, a motor system, a driving chain, a cylinder, a main shaft, a bracket and a tank body. The device can conveniently simulate the operating conditions of the scraper chain in an actual sewage treatment plant, detect the wear of the chain after a certain period of operation, and thus predict the service life of the chain.

[0005] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solution:

[0006] A device for testing the wear resistance of a non-metallic scraper chain comprises: a tank body and a bracket installed in the tank body, a cylinder, a motor system and a main shaft are installed on the bracket, the main shaft comprises a front shaft and a rear shaft, the front shaft is connected to the telescopic end of the cylinder through a connecting piece, traction sprockets are installed on the front shaft and the rear shaft, the traction sprocket on the front shaft and the traction sprocket on the rear shaft are matched with the traction chain to be tested, the rear shaft and the motor system are equipped with a driving sprocket, and the driving sprocket of the rear shaft and the driving sprocket of the motor system are matched with the driving chain.

[0007] As a preferred solution of the present invention, the traction chains to be tested are arranged in two groups, the traction sprockets are arranged in four groups, and the cylinders are arranged in two groups.

[0008] As a preferred solution of the present invention, the traction sprockets are all located on the same horizontal plane.

[0009] As a preferred solution of the present invention, the traction chain to be tested is formed by connecting a plurality of chain links, latches and buckles end to end.

[0010] As a preferred solution of the present invention, the motor system includes a drive motor and a reducer. The drive motor outputs a rotation speed and torque after passing through the reducer, and provides operating power for the entire device through a drive sprocket and a drive chain.

[0011] As a preferred solution of the present invention, the tank body is a steel structure or a cement structure, and is used to provide operating medium for the test device.

[0012] A method for testing the wear resistance of a non-metallic scraper chain, comprising:

[0013] Step 1: Number the chain links and pin samples of the traction chain to be tested respectively, measure the inner and outer diameters of the parts of the chain links that are prone to wear and tear and the outer diameter of the pins, and then assemble the chain links and install them on the traction sprocket of the test device;

[0014] Step 2: According to the test requirements, set the motor reducer speed, cylinder pressure and add medium to the tank body, start the motor to keep the device running normally;

[0015] Step 3: After the device has been running for a certain period of time, stop running, remove the traction chain to be tested and disassemble it into individual chain links, pins and buckles, and measure and record the inner and outer diameters of the numbered chain link contact wear parts and the outer diameter of the pin again;

[0016] Step 4: The actual wear amount of each traction chain to be tested can be calculated by calculating the difference in relevant data of the chain links and pins before and after the test.

[0017] Due to the adoption of the above technical solution, the present invention has the following beneficial effects:

[0018] The present invention can very conveniently simulate the operation condition of the scraper chain in the actual sewage treatment plant by setting the combination of the tank body and the bracket for containing the medium, and installing the traction chain to be tested on the traction sprocket of the bracket, so as to make the measurement more accurate and effective. Before the test, the chain links and pin samples of the chain to be tested are numbered and measured respectively, and after the operation, the chain to be tested is removed and disassembled into single chain links, pins and buckles, and the inner and outer diameters of the numbered chain link contact wear parts and the outer diameter of the pin are measured and recorded again respectively. It can be convenient and fast to calculate the actual wear amount of each chain by calculating the relevant data difference of the chain links and pins before and after the test, so as to facilitate the prediction of the service life of the chain, facilitate the timely maintenance and replacement of the chain, reduce the operating cost, facilitate overall management, and have good practical effect. At the same time, by reasonably adjusting the motor system of the device, the wear frequency of the chain when running under this condition can be accelerated, and the test efficiency can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a front structural cross-sectional view of the present invention;

[0021] Figure 3 It is a schematic diagram of the top structure of the present invention.

[0022] In the figure: 1. traction chain to be tested; 2. traction sprocket; 3. driving sprocket; 4. motor system; 5. driving chain; 6. cylinder; 7. main shaft; 8. bracket; 9. pool body. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0024] Example 1

[0025] like Figures 1 to 3As shown, a specific embodiment of a device and method for testing the wear resistance of a non-metallic scraper chain according to the present invention: the device is composed of a traction chain 1 to be tested, a traction sprocket 2, a drive sprocket 3, a motor system 4, a drive chain 5, a cylinder 6, a main shaft 7, a bracket 8 and a tank body 9. Among them, four traction sprockets 2 are respectively installed on two coaxial main shafts 7 at the front and rear by fasteners, and the main shaft 7 includes a front shaft and a rear shaft, and the main shaft 7 is solid stainless steel. Two groups of traction chains 1 to be tested are respectively installed on the two traction sprockets 2 on the same side of the front and rear, so that the two traction sprockets 2 on the same side and the traction chain 1 to be tested are in the same plane. Two drive sprockets 3 are respectively installed on the rear shaft and the motor system 4, and are connected by the drive chain 5 to provide operating power for the entire device. The front shaft is connected to the telescopic ends of the two cylinders 6 through a connecting piece, and the base, motor, rear shaft, etc. of the cylinder 6 are fixed on the bracket 8, and the entire bracket 8 system is installed in the tank body 9.

[0026] The two groups of traction chains 1 to be tested are connected end to end by chain links, latches and buckles. Their specifications and materials are the same as the chains actually used in sewage treatment plants. The chain links are made of non-metallic materials, with a pitch of 152.4 mm, and are integrally injection molded. The latches and buckles are also made of non-metallic materials and are integrally injection molded. Before the wear test, the chain link and latch samples of the two groups are numbered respectively, and the inner and outer diameters of the chain links that are easily exposed to wear and the outer diameter of the latch are measured. After the measurement is completed, they are assembled into the two groups of traction chains 1 to be tested for standby use.

[0027] The specifications and materials of the four traction sprockets 2 are the same as those of the sprockets actually used in the sewage treatment plant, with 23 teeth, a diameter of about 560 mm, cast nylon material, and cast molding.

[0028] The specifications and materials of the two driving sprockets 3 are the same as those of the sprockets actually used in the sewage treatment plant, with 11 teeth, a diameter of about 260 mm, cast nylon material, and cast molding.

[0029] The driving chain 5 is composed of a number of chain links, latches, etc. connected end to end. Its specifications and materials are the same as the chains actually used in sewage treatment plants. The chain links are made of non-metallic materials, with a pitch of 66.3 mm, and are integrally injection molded. The latches are made of stainless steel. The device can also measure the wear of the non-metallic driving chain 5. As with the wear test of the traction chain, the chain link samples of the driving chain 5 are numbered before the wear test, and the diameter of the easily worn parts of the chain links is measured at the same time, and then assembled into a chain with the latches for standby use.

[0030] The motor system 4 is composed of a drive motor and a reducer. The drive motor outputs a suitable speed and torque after being decelerated by the reducer, and provides operating power for the entire device through the drive sprocket 3 and the drive chain 5. In order to reduce the running time of the device and accelerate the frequency of chain wear, the speed output by the reducer is to ensure that the walking speed of the traction chain 1 to be tested is about 10 meters / minute. Before the test officially starts, the chain running speed needs to be further corrected. The correction method is as follows: select a position on the chain to be tested that is easy to observe, tie a red belt, start the motor and the entire device starts running. When the red belt passes the observation point, start the stopwatch and record the time it takes for the red belt to turn 5 circles around the traction sprocket 2. Repeat this step 5 times to calculate the average running speed of the chain (in meters / minute, and then converted to circles / minute). The same steps are also used to correct the running speed of the drive chain 5 in circles / minute.

[0031] The telescopic end of the cylinder 6 is connected to the front axle, and the base of the cylinder 6 is fixed on the bracket 8. The load applied to the traction chain 1 to be tested is controlled by adjusting the pressure in the cylinder 6. The load size refers to the load actually borne by the traction chain of the scraper in the sewage treatment plant. Here, the load size applied to each set of traction chains is about 1 ton, and the load size remains constant during the entire test period.

[0032] The tank body 9 is a steel structure. During the test, a proper amount of sewage is introduced into the tank body 9 . The sewage is taken from a sewage treatment plant. The sewage submerges the lower end of the traction chain 1 to be tested but does not overflow the cylinder 6 .

[0033] The starter motor keeps the device running normally under the above simulated working conditions. After 30 days of operation, the device stops running, removes the two groups of chains to be tested and disassembles them into individual links, pins and buckles. The inner and outer diameters of the numbered links in the two groups of chains and the outer diameter of the pins are measured and recorded again. Similarly, the diameter of the wear-prone part of the drive chain 5 links is measured again. The actual wear amount of each chain can be calculated by calculating the difference in the relevant data of the links and pins before and after the test.

[0034] According to the measured wear of the traction chain and the drive chain 5 and the total number of circles the chain runs in 30 days, the wear of each circle of the chain can be calculated, thereby predicting the overall service life of the chain.

[0035] In this embodiment, the tank body 9 may also be a cement structure, which is used to contain the medium and provide the operating medium for the test device.

[0036] The components in this article are all universal standard parts or components known to those skilled in the art. Their structures and principles can be known to those skilled in the art through technical manuals or conventional experimental methods, so they will not be described in detail here.

[0037] Although the specific embodiments of the present invention are described in detail above, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in this field without departing from the purpose of the present invention, and modifications or deformations without creative labor are still within the protection scope of the present invention.

Claims

1. A device for testing the wear resistance of a non-metallic scraper chain, comprising: A tank body (9) and a bracket (8) installed in the tank body (9), characterized in that: a cylinder (6), a motor system (4) and a main shaft (7) are installed on the bracket (8), the main shaft (7) includes a front shaft and a rear shaft, the front shaft is connected to the telescopic end of the cylinder (6) through a connecting piece, a traction sprocket (2) is installed on the front shaft and the rear shaft, the traction sprocket (2) on the front shaft and the traction sprocket (2) on the rear shaft are matched with a traction chain (1) to be tested, the rear shaft and the motor system (4) are equipped with a drive sprocket (3), and a drive chain (5) is matched with the drive sprocket (3) of the rear shaft and the drive sprocket (3) of the motor system (4).

2. The device for testing the wear resistance of non-metallic scraper chains according to claim 1, characterized in that: The traction chains (1) to be tested are arranged in two groups, the traction sprockets (2) are arranged in four groups, and the cylinders (6) are arranged in two groups.

3. The device for testing the wear resistance of non-metallic scraper chains according to claim 2, characterized in that: The traction sprockets (2) are all located on the same horizontal plane.

4. The device for testing the wear resistance of non-metallic scraper chains according to claim 1, characterized in that: The traction chain (1) to be tested is formed by connecting a plurality of chain links, latches and buckles end to end.

5. The device for testing the wear resistance of non-metallic scraper chains according to claim 1, characterized in that: The motor system (4) comprises a driving motor and a reducer. The driving motor outputs a rotation speed and a torque after passing through the reducer, and provides operating power for the entire device through a driving sprocket (3) and a driving chain (5).

6. The device for testing the wear resistance of non-metallic scraper chains according to claim 1, characterized in that: The tank body (9) is a steel structure or a cement structure, and is used to provide operating medium for the test device.

7. A method for testing the wear resistance of a non-metallic scraper chain, comprising the following steps: Step 1: Number the chain links and pin samples of the traction chain (1) to be tested respectively, measure the inner and outer diameters of the parts of the chain links that are easily exposed to wear and the outer diameter of the pins, and then assemble the chain links and install them on the traction sprocket (2) of the test device; Step 2: According to the test requirements, set the motor reducer speed and the cylinder (6) pressure and add the medium into the tank (9), start the motor to keep the device running normally; Step 3: After the device has been running for a specific period of time, it is stopped, the traction chain to be tested (1) is removed and disassembled into individual chain links, latches and buckles, and the inner and outer diameters of the numbered chain link contact wear parts and the outer diameter of the latch are measured and recorded again; Step 4: The actual wear amount of each traction chain (1) to be tested can be calculated by calculating the difference in the relevant data of the chain links and the latches before and after the test.

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