Equipment for testing scratch resistance of pipe coating layer

Abstract

The invention belongs to the technical field of fuel gas PE pipeline performance testing, and discloses pipe coating layer scratch resistance testing equipment which comprises a clamping mechanism, a ballasting mechanism, a measuring scale and a control device, a testing pipe fitting is fixedly installed on the clamping mechanism, the clamping mechanism is used for clamping the testing pipe fitting, the ballasting mechanism is fixedly installed above the clamping mechanism, and the measuring scale is used for measuring the scratch resistance of the pipe coating layer. The pressure applying mechanism is aligned with the surface of the test pipe fitting and used for applying pressure and scratching the test pipe fitting, the measuring scale is fixedly installed on the ballast mechanism and used for indicating the scratch depth, and the control device is fixedly installed on one side of the clamping mechanism and used for controlling the ballast mechanism to move. The device is suitable for testing pipes of any specification, and is provided with side and axial anti-skid supports to ensure that the tested pipe fitting cannot move in a scraping test; a scratching head moving mode is adopted, the stability is higher, a tested pipe fitting is not prone to deviation, and the graduated scale of a mechanical structure can be used for measuring and reading the scratching depth in real time. And the working efficiency and the test accuracy are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of gas PE pipeline performance testing, and in particular relates to a device for testing the scratch resistance performance of a pipe coating layer. Background Art

[0002] PE coated pipes are composed of a pipe body and a coating layer. During trenchless dragging construction, the coating layer can effectively resist scratches caused by sharp rocks and protect the inner pipe from damage. The material and thickness of the coating layer determine the scratch resistance of the coated pipe. The scratch resistance of the PE coated pipe needs to be tested before it leaves the factory. The existing scratch resistance testing equipment is composed of a test platform, a test platform traction mechanism, a scratch head and a lever counterweight loading mechanism thereon. However, the pipe fixing method of these devices is single and can only be adapted to certain types of pipe fittings. It cannot be flexibly adjusted. In addition, the traction mechanism of the test platform drives the pipe fittings to move, which has poor stability. The fixing of the pipe fittings is prone to displacement during movement. The test results cannot be read directly and need to be calculated manually. Summary of the invention

[0003] The purpose of the present invention is to provide a device for testing the scratch resistance of a pipe coating layer to solve the above-mentioned technical problems.

[0004] In order to solve the above technical problems, the specific technical solution of a pipe coating scratch resistance testing device of the present invention is as follows: A test device for the scratch resistance performance of a pipe coating layer comprises a clamping mechanism, a ballast mechanism, a measuring scale and a control device. The test pipe is fixedly mounted on the clamping mechanism, the clamping mechanism is used to clamp the test pipe, the ballast mechanism is fixedly mounted above the clamping mechanism and is aligned with the surface of the test pipe to apply pressure and scratch the test pipe, the measuring scale is fixedly mounted on the ballast mechanism to indicate the scratch depth, and the control device is fixedly mounted on one side of the clamping mechanism to control the movement of the ballast mechanism.

[0005] Furthermore, the clamping mechanism includes a fixed base, a support rod, a support rod fixing seat, a side clamping baffle and an axial clamping baffle. The two support rod fixing seats are respectively fixedly installed at both ends of the fixed base. The two ends of the support rod are fixedly installed on the support rod fixing seats through bearing seats. The test pipe fitting is sleeved on the support rod and tightened by the side clamping baffle and the axial clamping baffle.

[0006] Furthermore, the side clamping baffles include multiple groups, which are respectively arranged on both sides of the test tube. The side clamping baffles are L-shaped and have mounting holes at the bottom. After clamping the two side walls of the test tube, the side clamping baffles are fixedly installed on the fixed base with screws. The fixed base has multiple mounting holes, and the installation position of the side clamping baffles can be flexibly adjusted according to different models of the test tube.

[0007] Furthermore, the axial clamping baffle is arranged at both ends of the test pipe, the upper end of the axial clamping baffle is sleeved on the support rod, and the lower end is fixedly installed on the fixed base.

[0008] Furthermore, a transverse reinforcement piece is also provided at the bottom end of the axial clamping baffle, one end of the transverse reinforcement piece is fixedly connected to the axial clamping baffle, and the other end is fixedly mounted on the fixed base through a fixing column.

[0009] Furthermore, the ballast mechanism includes an outer shell, a movable device and a scratching device. The outer shell is fixedly installed above the fixed base through a column. The outer shell has two horizontal movable grooves at the upper and lower parts. The scratching device is arranged in the movable groove. The movable device is arranged inside the outer shell and is connected to the scratching device to drive the scratching device to move.

[0010] Furthermore, the scratching device includes a top seat, a connecting rod, a scratching head base and a scratching head. The top seat is arranged on a movable groove above the scratching device shell, and the lower end is fixedly connected to the upper end of the connecting rod. The lower end of the connecting rod is fixedly connected to the scratching head. There are slide rails on both sides of the movable groove below the shell. The scratching head base is slidably connected to the slide rails and is movably connected to the periphery of the scratching head. The scratching head can slide up and down in the scratching head base.

[0011] Furthermore, the measuring ruler is fixedly mounted on the scratch head base and extends downwardly out of the movable slot below the housing. The scratch head is provided with a horizontal indicating arrow. The scratch depth can be measured and read through the measuring ruler and the indicating arrow on the scratch head.

[0012] Furthermore, the moving device includes a moving device fixing seat, a gear group and a chain. The moving device fixing seat is fixedly installed on both sides of the inside of the shell, the gear group is fixedly installed on the moving device fixing seat, the chain is installed on the gear group, and the bottom of the chain is fixedly connected to the scratching head base of the scratching device, and the chain can drive the scratching head base to move along the slide rail.

[0013] Furthermore, the control device includes a hydraulic cylinder fixing seat, a hydraulic cylinder, a pressure sensor, a mobile motor, a device switch, a working indicator light and a display screen. The hydraulic cylinder fixing seat is fixedly connected to one side of the fixed base, and the hydraulic cylinder is fixedly installed on the hydraulic cylinder fixing seat. A pressure sensor is installed at the output end of the hydraulic cylinder, and the pressure sensor is connected to the upper end of the top seat of the scratching device through a delivery pipeline. The load size is adjusted by the hydraulic cylinder oil pressure and the pressure sensor. The mobile motor is fixedly connected to the gear group of the mobile device to drive the gear group to rotate, thereby controlling the chain to drive the scratching head to move. The device switch, working indicator light and display screen are fixedly installed on the outer casing. The device switch is used to turn on and off the equipment, the working indicator light is used to indicate the working status, and the display screen is used to display and set the current working parameters.

[0014] The scratch resistance performance testing equipment of the pipe coating layer of the present invention has the following advantages: the scratch resistance performance testing equipment of the pipe coating layer of the present invention supports and fixes the pipe through a clamping mechanism, and is supported from the inner wall of the pipe by a support rod, so it can be applied to the test of pipes of any specifications, and has lateral and axial anti-slip supports to ensure that the test pipe will not move during the scratch test; the load of the ballast mechanism is provided by a hydraulic cylinder, and the load size can be set arbitrarily according to the test requirements, and different types of scratch heads can be replaced to meet the experimental requirements of different parameters; the equipment adopts the method of moving the scratch head, which is more stable, and the test pipe is not easy to deviate. The equipment comes with a mechanical structure scale, which can measure and read the scratch depth in real time. Finally, the number of scratches, moving speed, and moving distance are controlled by the control device. The overall work efficiency and test accuracy are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the pipe coating layer scratch resistance testing equipment of the present invention; Figure 2 It is a schematic diagram of the internal structure of the pipe coating layer scratch resistance testing equipment of the present invention; Figure 3 It is a schematic diagram of the structure of the control device of the present invention; Figure 4 It is a schematic diagram of the structure of the measuring scale and the scratching head of the present invention; Explanation of marks in the figure: 1. Clamping mechanism; 11. Fixed base; 12. Support rod; 13. Support rod fixing seat; 14. Side clamping baffle; 15. Axial clamping baffle; 2. Ballast mechanism; 21. Shell; 211. Column; 212. Moving groove; 213. Slide rail; 22. Moving device; 221. Moving device fixing seat; 222. Gear set; 223. Chain; 23. Scratching device; 231. Top seat; 232. Connecting rod; 233. Scratching head base; 234. Scratching head; 2341. Indicator arrow; 3. Measuring scale; 4. Control device; 41. Hydraulic cylinder fixing seat; 42. Hydraulic cylinder; 43. Pressure sensor; 44. Device switch; 45. Working indicator light; 46. Display screen; 5. Test pipe fittings. DETAILED DESCRIPTION

[0016] In order to better understand the purpose, structure and function of the present invention, a device for testing the scratch resistance of a pipe coating layer of the present invention is described in further detail below in conjunction with the accompanying drawings.

[0017] like Figure 1-4 As shown, a device for testing the scratch resistance of a pipe coating layer of the present invention comprises a clamping mechanism 1, a ballast mechanism 2, a measuring scale 3 and a control device 4. A test pipe 5 is fixedly mounted on the clamping mechanism 1, and the clamping mechanism 1 is used to clamp the test pipe 5. The ballast mechanism 2 is fixedly mounted above the clamping mechanism 1 and is aligned with the surface of the test pipe 5 to apply pressure and scratch the test pipe 5. The measuring scale 3 is fixedly mounted on the ballast mechanism 2 to indicate the scratch depth. The control device 4 is fixedly mounted on one side of the clamping mechanism 1 to control the movement of the ballast mechanism 2.

[0018] The clamping mechanism 1 includes a fixed base 11, a support rod 12, a support rod fixing seat 13, a side clamping baffle 14, and an axial clamping baffle 15. The two support rod fixing seats 13 are respectively fixedly installed at both ends of the fixed base 11, and the two ends of the support rod 12 are fixedly installed on the support rod fixing seat 13 through bearing seats. The test pipe fitting 5 is sleeved on the support rod 12. The side clamping baffle 14 includes multiple groups, which are respectively arranged on both sides of the test pipe fitting 5. The side clamping baffle 14 is L-shaped and has a mounting hole at the bottom. After clamping the two side walls of the test pipe fitting 5, the side clamping baffle 14 is fixedly installed on the fixed base 11 with screws. There are multiple mounting holes on the fixed base 11, and the mounting position of the side clamping baffle 14 can be flexibly adjusted according to different models of the test pipe fitting 5. The axial clamping baffle 15 is arranged at both ends of the test pipe 5. The upper end of the axial clamping baffle 15 is sleeved on the support rod 12, and the lower end is fixedly mounted on the fixed base 11. In order to enhance the clamping stability of the axial clamping baffle 15, a transverse reinforcement 16 is also arranged at the bottom end of the axial clamping baffle 15. One end of the transverse reinforcement 16 is fixedly connected to the axial clamping baffle 15, and the other end is fixedly mounted on the fixed base 11 through a fixed column 161. During the test, the inner wall surface of the test pipe 5 is supported to adapt to test pipes of different calibers and wall thicknesses. The axial clamping baffle 15 prevents the lateral displacement of the pipe during the test, and the side clamping baffle 14 prevents the pipe from shaking, thereby avoiding errors in the experimental results.

[0019] The ballast mechanism 2 includes an outer shell 21, a movable device 22, and a scratching device 23. The outer shell 21 is fixedly installed above the fixed base 11 through a column 211. The outer shell 21 has two horizontal movable grooves 212 at the upper and lower parts. The scratching device 23 is arranged in the movable groove 212. The movable device 22 is arranged inside the outer shell 21 and is connected to the scratching device 23 to drive the scratching device 23 to move.

[0020] The scratching device 23 includes a top seat 231, a connecting rod 232, a scratching head base 233, and a scratching head 234. The top seat 231 is arranged on a movable groove 242 above the scratching device housing 24, and the lower end is fixedly connected to the upper end of the connecting rod 232, and the lower end of the connecting rod 232 is fixedly connected to the scratching head 234. The movable groove 212 below the housing 21 has slide rails 213 on both sides, and the scratching head base 233 is slidably connected to the slide rails 213 and movably connected to the periphery of the scratching head 234. The scratching head 234 can slide up and down in the scratching head base 233. The scratching head 234 is replaceable and can be replaced when the scratching head 234 is worn or the size does not match.

[0021] The measuring scale 3 is fixedly mounted on the scratch head base 233, and extends below the movable slot 212 below the housing 21. The scratch head 234 has a horizontal indicating arrow 2341. The scratch depth can be measured and read by measuring the scale 3 and the indicating arrow 2341 on the scratch head 234. The measuring scale 3 can be adjusted up and down, and can be adjusted to zero when measuring different wall thicknesses. When a scratch occurs, the scratch head 234 drops as a whole, and the dropping distance is read through the scale, which is the scratch depth.

[0022] The moving device 22 includes a moving device fixing base 221, a gear set 222 and a chain 223. The moving device fixing base 221 is fixedly installed on both sides of the inner part of the outer shell 21, the gear set 222 is fixedly installed on the moving device fixing base 221, and the chain 223 is installed on the gear set 222. The chain 223 is fixedly connected to the scratching head base 233 of the scratching device 23 at the bottom, and the chain 223 can drive the scratching head base 233 to move along the slide rail 213.

[0023] The control device 4 includes a hydraulic cylinder fixing seat 41, a hydraulic cylinder 42, a pressure sensor 43, a moving motor (not shown in the figure), a device switch 44, a working indicator light 45 and a display screen 46. The hydraulic cylinder fixing seat 41 is fixedly connected to one side of the fixed base 11, and the hydraulic cylinder 42 is fixedly installed on the hydraulic cylinder fixing seat 41. The pressure sensor 43 is installed at the output end of the hydraulic cylinder 42. The pressure sensor 43 is connected to the upper end of the top seat 231 of the scratching device 23 through a conveying pipeline. The load size is adjusted by the oil pressure of the hydraulic cylinder 42 and the pressure sensor 43. The moving motor is fixedly connected to the gear set 222 of the moving device 22, and is used to drive the gear set 222 to rotate, thereby controlling the chain 223 to drive the scratching head 234 to move. The device switch 44, the working indicator light 45 and the display screen 46 are fixedly installed on the housing 21. The device switch 44 is used to turn on and off the device, the working indicator light 45 is used to indicate the working status, and the display screen 46 is used to display and set the current working parameters.

[0024] A method for testing the scratch resistance of a pipe coating layer of the present invention comprises the following steps: 1. Clamp the test pipe 5 through the clamping mechanism 1. Remove the support rod fixing seat 13, insert the test pipe 5 into the support rod 12, re-fix the support rod fixing seat 13, and the test pipe 5 is supported by the support rod 12. Fix the side clamping baffle 14 according to the diameter of the test pipe 5, and fix the axial clamping baffle 15 according to the length of the test pipe 5 to ensure that the test pipe 5 does not move horizontally or shake.

[0025] 2. Select a scratch head 234 that meets the test requirements and install it on the scratch head base 233, control the up and down position of the scratch head base 233, and after the scratch head 234 is attached to the surface of the test pipe 5, adjust the measuring scale 3 so that the indicator arrow 2341 is aligned with the zero scale line of the measuring scale 3.

[0026] 3. According to the test requirements, the load pressure, the stroke of the scratching head, and the speed of the scratching head are set through the control device 4. The hydraulic cylinder 42 applies the set pressure, and the actual pressure value can be observed on the pressure sensor 43. According to the set speed and stroke, the moving motor of the moving device 22 drives the chain 223 to move, thereby driving the scratching head base 233 to move.

[0027] Specifically, The working parameters are set on the display screen 46, and the pressure of the hydraulic cylinder 42 is controlled so that the total load reaches 30kg, 50kg or other loads. After the load is applied, the test is started within 5 seconds.

[0028] The speed of the moving motor is set so that the moving device 22 moves horizontally with the scratching head 234 at a constant speed of 250 mm / min+25 mm / min. The scratch length is preferably 75 mm.

[0029] Set the number of scratches and repeat the scratching action.

[0030] 4. Measure the scratch depth during the movement. When a scratch occurs, the scratch head base 233 moves downward as a whole, and produces a relative displacement in the vertical direction with the measuring scale 3, and the scratch depth is measured by the measuring scale 3.

[0031] 5. After reaching the specified scratching distance, stop the test, control the hydraulic cylinder 42 to raise the scratching device 23, and take out the test pipe 5.

[0032] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A test device for the scratch resistance of a pipe coating, characterized in that: The invention comprises a clamping mechanism (1), a ballast mechanism (2), a measuring scale (3) and a control device (4); the test pipe (5) is fixedly mounted on the clamping mechanism (1); the clamping mechanism (1) is used to clamp the test pipe (5); the ballast mechanism (2) is fixedly mounted above the clamping mechanism (1) and is aligned with the surface of the test pipe (5) to apply pressure to the test pipe (5) to scratch it; the measuring scale (3) is fixedly mounted on the ballast mechanism (2) to indicate the scratch depth; and the control device (4) is fixedly mounted on one side of the clamping mechanism (1) to control the movement of the ballast mechanism (2).

2. The pipe coating scratch resistance testing device according to claim 1, characterized in that: The clamping mechanism (1) comprises a fixed base (11), a support rod (12), a support rod fixing seat (13), a side clamping baffle (14) and an axial clamping baffle (15); the two support rod fixing seats (13) are fixedly mounted at two ends of the fixed base (11), respectively; the two ends of the support rod (12) are fixedly mounted on the support rod fixing seats (13) via bearing seats; the test pipe (5) is sleeved on the support rod (12) and is tightened via the side clamping baffle (14) and the axial clamping baffle (15).

3. The pipe coating scratch resistance testing device according to claim 2, characterized in that: The side clamping baffles (14) include a plurality of groups, which are respectively arranged on both sides of the test pipe (5). The side clamping baffles (14) are L-shaped and have mounting holes at the bottom. After clamping the two side walls of the test pipe (5), the side clamping baffles (14) are fixedly mounted on the fixed base (11) using screws. The fixed base (11) has a plurality of mounting holes, and the mounting position of the side clamping baffles (14) can be flexibly adjusted according to different models of the test pipe (5).

4. The pipe coating scratch resistance testing device according to claim 2, characterized in that: The axial clamping baffle (15) is arranged at both ends of the test pipe (5); the upper end of the axial clamping baffle (15) is sleeved on the support rod (12), and the lower end is fixedly mounted on the fixed base (11).

5. The pipe coating scratch resistance testing device according to claim 4, characterized in that: A transverse reinforcement piece is also provided at the bottom end of the axial clamping baffle (15); one end of the transverse reinforcement piece is fixedly connected to the axial clamping baffle (15), and the other end is fixedly mounted on the fixed base (11) via a fixing column.

6. The pipe coating scratch resistance testing device according to claim 2, characterized in that: The ballast mechanism (2) comprises an outer shell (21), a moving device (22) and a scratching device (23); the outer shell (21) is fixedly mounted above the fixed base (11) via a column (211); the outer shell (21) has two transverse moving grooves (212) at the top and bottom; the scratching device (23) is arranged in the moving grooves (212); the moving device (22) is arranged inside the outer shell (21) and is connected to the scratching device (23) to drive the scratching device (23) to move.

7. The pipe coating scratch resistance testing device according to claim 6, characterized in that: The scratching device (23) comprises a top seat (231), a connecting rod (232), a scratching head base (233) and a scratching head (234); the top seat (231) is arranged on a movable groove (212) above a housing (21) of the scratching device (23); the lower end of the top seat (231) is fixedly connected to the upper end of the connecting rod (232); the lower end of the connecting rod (232) is fixedly connected to the scratching head (234); both sides of the movable groove (212) below the housing (21) are provided with slide rails (213); the scratching head base (233) is slidably connected to the slide rails (213) and is movably connected to the periphery of the scratching head (234); the scratching head (234) can slide up and down in the scratching head base (233).

8. The pipe coating scratch resistance testing device according to claim 7, characterized in that: The measuring scale (3) is fixedly mounted on the scratch head base (233) and extends downwardly out of the movable slot (212) below the housing (21). The scratch head (234) is provided with a transverse indicating arrow (2341). The scratch depth can be measured and read by means of the measuring scale (3) and the indicating arrow (2341) on the scratch head (234).

9. The pipe coating scratch resistance testing device according to claim 7, characterized in that: The moving device (22) comprises a moving device fixing seat (221), a gear set (222) and a chain (223); the moving device fixing seat (221) is fixedly mounted on both sides of the interior of the housing (21); the gear set (222) is fixedly mounted on the moving device fixing seat (221); the chain (223) is mounted on the gear set (222); the lower part of the chain (223) is fixedly connected to a scratching head base (233) of the scratching device (23); and the chain (223) can drive the scratching head base (233) to move along the slide rail (213).

10. The pipe coating scratch resistance testing device according to claim 9, characterized in that: The control device (4) comprises a hydraulic cylinder fixing seat (41), a hydraulic cylinder (42), a pressure sensor (43), a moving motor, a device switch (44), a working indicator light (45) and a display screen (46); the hydraulic cylinder fixing seat (41) is fixedly connected to one side of the fixed base (11); the hydraulic cylinder (42) is fixedly mounted on the hydraulic cylinder fixing seat (41); a pressure sensor (43) is mounted on the output end of the hydraulic cylinder (42); the pressure sensor (43) is connected to the upper end of the top seat (231) of the scratching device (23) through a delivery pipeline; and the hydraulic cylinder ( 42) oil pressure and pressure sensor (43) adjust the load size, the mobile motor is fixedly connected to the gear group (222) of the mobile device (22) and is used to drive the gear group (222) to rotate, thereby controlling the chain (223) to drive the scratching head (234) to move, the device switch (44), working indicator light (45) and display screen (46) are fixedly installed on the housing (21), the device switch (44) is used to turn on and off the device, the working indicator light (45) is used to indicate the working status, and the display screen (46) is used to display and set the current working parameters.

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