A polyolefin composite wear-resistant pipe mortar wear rate testing machine and test method

Abstract

The present invention relates to the technical field of wear-resistant pipes, and specifically discloses a polyolefin composite wear-resistant pipe mortar wear rate testing machine and testing method. The testing machine includes a frame and an adjustment assembly. The frame is provided with multiple mortar barrels and rotating shafts. The rotating shafts are rotatably connected to the frame. One end of the rotating shaft extends into the mortar barrel and is provided with a clamp assembly. The frame is also provided with a drive assembly for driving the rotating shaft to rotate. The rotating shaft and the mortar barrel are coaxial. The frame is connected to a temperature control shell. The temperature control shell is connected to the mortar barrel, and a temperature control liquid flows in the temperature control shell. The temperature control shell and the frame are slidably connected, and the sliding direction is the axial direction of the rotating shaft. The adjustment assembly is used to slide the temperature control shell. The present invention uses the adjustment assembly to enable the mortar barrel to move axially when the pipe sample rotates in the mortar barrel, so that the pipe sample comes into contact with sand particles of different particle sizes, thereby improving the authenticity of the testing process and the accuracy of the results.

Description

Technical Field

[0001] The invention relates to the technical field of wear-resistant pipes, and in particular to a polyolefin composite wear-resistant pipe mortar wear rate testing machine and a testing method. Background Art

[0002] Wear-resistant pipes are used in pneumatic conveying, slurry pumping, and other material transport applications. Due to the high hardness, fast velocity, and high flow rate of the conveying medium, long-term impact, wear, and corrosion on the pipe wall can easily wear through ordinary pipes, shortening their service life. Polyolefin composite wear-resistant pipes utilize a wear-resistant polyolefin material as the wear-resistant layer, co-extruded with a base pipe. These high-performance, wear-resistant pipes are suitable for long-term operation and require high wear resistance. They are used to transport a variety of liquids, slurries, and granular solids.

[0003] The mortar wear test is a method for testing the wear resistance of a material, and requires a mortar wear tester for operation. The patent document with announcement number CN101710052B discloses a method for testing the wear resistance of ultra-high molecular weight polyethylene, which discloses a mortar tester, which includes a wear test container, grinding mortar, a baffle, a fixing fixture, a rotating shaft, a sample, and a cooling jacket. The upper part of the rotating shaft is connected to the wear test container, and the lower part of the rotating shaft is connected to the fixing fixture, and the sample to be tested is fixed on the fixing fixture. The grinding mortar is a solid-liquid mixture of quartz sand and water mixed in a certain ratio. The pre-prepared grinding mortar is placed in the test container, and the lower end of the rotating shaft is extended into the grinding mortar and drives the sample to rotate. The cooling jacket is set outside the grinding test container, and the internal space of the cooling jacket is used to pass a constant temperature liquid so that the internal space of the wear test container can maintain a stable specific temperature condition as much as possible.

[0004] Since the wear test container contains a solid-liquid mixture, the rotating shaft with the sample acts as a stirring paddle during the rotation process. Without changing the quartz sand used, the quartz sand of different particle sizes tends to be stable in the height space distribution in the container under uniform rotation. The density distribution of the mixture in the axial direction of the container also tends to be stable but unbalanced, resulting in the quartz sand in contact with the sample having a high degree of uniformity. The sand with larger or smaller particle sizes has insufficient contact with the sample. For more complex actual application scenarios or different working conditions, the reference value of this test result is relatively low. Summary of the Invention

[0005] The present invention provides a polyolefin composite wear-resistant pipeline mortar wear rate testing machine and testing method, aiming to solve the problem in related technologies of low reference value of test results caused by the single sand material contacted by the sample.

[0006] The present invention provides a polyolefin composite wear-resistant pipeline mortar wear rate testing machine, comprising a frame, the frame being provided with a plurality of mortar containing barrels and a plurality of rotating shafts, the rotating shafts being rotatably connected to the frame, one end of the rotating shafts extending into the mortar containing barrels and being provided with a clamp assembly for clamping pipeline samples, the frame being further provided with a driving assembly for driving the rotating shafts to rotate; the rotating shafts and the mortar containing barrels are coaxial, a temperature-control cylinder shell is connected to the frame and to the outside of the mortar containing barrel, the temperature-control cylinder shell and the mortar containing barrel are detachably connected, a temperature-control liquid circulates in the temperature-control cylinder shell, and an adjusting assembly is further included, the temperature-control cylinder shell and the frame being slidably connected, the sliding direction being the axial direction of the rotating shaft, and the adjusting assembly being used to control the sliding of the temperature-control cylinder shell.

[0007] The effect is that the rotating shaft drives the pipeline sample to rotate in the mortar barrel containing mortar. During the rotation, the movement direction of the pipeline sample is the circumference of the mortar barrel. Liquid at a specific temperature is continuously introduced into the temperature-controlled cylinder shell to maintain a stable temperature condition for the mortar barrel inside. The mortar in the mortar barrel also forms a rotational movement trend after being stirred by the clamp assembly and the pipeline sample. Sand particles of different particle sizes are regularly distributed in the axial direction of the mortar barrel. When the temperature-controlled cylinder shell moves along the axial direction of the rotating shaft, the mortar barrel and the mortar therein also move synchronously. At this time, the relative positions of the mortar barrel, the rotating shaft and the pipeline sample on the rotating shaft also change. Under the condition of constant rotation speed, the pipeline sample can collide and contact with sand particles at different axial positions, that is, the contact degree between the pipeline sample and the sand material is improved, and the test results can also have higher accuracy.

[0008] Preferably, the adjustment assembly includes a guide piston column and a pressure infusion tube, one end of the guide piston column is fixedly connected to the frame, and the other end passes through the temperature control cylinder shell and is located in the inner cavity of the temperature control cylinder shell. The length direction of the guide piston column is consistent with the sliding direction of the temperature control cylinder shell, and the inner cavity of the temperature control cylinder shell is connected to the temperature control liquid pump through the pressure infusion tube.

[0009] The effect is that the temperature-controlled liquid pump infuses or draws liquid into the inner cavity of the temperature-controlled cylinder shell through the pressure infusion tube, and controls the water pressure in the inner cavity of the temperature-controlled cylinder shell by controlling the water inlet flow rate and the water outlet flow rate, so that the temperature-controlled cylinder shell can be axially moved relative to the guide piston column through the action of pressure.

[0010] Preferably, the outer wall of the mortar containing barrel contacts the inner wall of the temperature control shell, the mortar containing barrel and the temperature control shell are threadedly connected, and the major diameter of the thread at the barrel mouth of the mortar containing barrel is smaller than the outer diameter of the mortar containing barrel.

[0011] The effect is that when the mortar barrel is installed into the temperature-controlled shell from bottom to top with the barrel mouth facing upward, the threaded structure at the barrel mouth of the mortar barrel will not block the process of the mortar barrel entering the temperature-controlled shell.

[0012] Preferably, the drive assembly includes a drive motor, a torque pulley and a transmission belt, the output shaft of the drive motor is coaxially connected to a main drive pulley, the torque pulley is coaxially connected to a rotating shaft, and the transmission belt is wound between the main drive pulley and the torque pulley, or between the torque pulley and the torque pulley.

[0013] The effect is that after the drive motor is started, the torque is transmitted to each torque pulley through the transmission belt, so that the rotating shafts corresponding to all the torque pulleys rotate synchronously.

[0014] Preferably, the pipeline sample is tubular. When the clamp assembly clamps the pipeline sample, the axis of the pipeline sample is an arc with the axis of the rotating shaft as the center. In the axial projection along the rotating shaft, the arc angle range of the trajectory of the pipeline sample is 75°-150°.

[0015] The effect is that the pipeline sample is tubular and the extension trajectory coincides with its rotation trajectory, which can simulate the situation of mortar flowing through the pipeline to a certain extent and improve the authenticity of the feedback of the detection test.

[0016] Preferably, a stabilizing core column is coaxially fixedly connected to the inner bottom wall of the mortar holding barrel, an exhaust channel is coaxially opened on the rotating shaft, the exhaust channel passes through the opposite ends of the rotating shaft, and the stabilizing core column coaxially penetrates one end of the exhaust channel and contacts the inner wall of the exhaust channel.

[0017] The effect is that since the center of gravity of the fixture assembly and the pipe sample is offset relative to the axis of the rotating shaft, the hole-axis fit of the stabilizing core column and the rotating shaft can improve the dynamic coaxiality of the rotating shaft, the stabilizing core column and the mortar bucket, thereby improving the stability of the rotating shaft during rotation.

[0018] Preferably, the clamp assembly includes an adjusting piece and two clamping bodies, the clamping body is rotatably connected to the rotating shaft, the rotation axis and the axis of the rotating shaft coincide with each other, the clamping body includes a connecting rotating plate and a clamping ring that are fixedly connected to each other, a matching ring groove is coaxially opened on the clamping ring, the end of the pipeline sample is coaxially inserted into the matching ring groove, the end face of the pipeline sample is in contact with the bottom of the matching ring groove, and the adjusting piece is used to make the clamping body generate an abutting force on the pipeline sample.

[0019] The effect is that the matching ring groove and the end face of the pipe sample are matched to make the end of the pipe sample and the clamping body relatively stable, and the two clamping bodies clamp the pipe sample in opposite directions at both ends of the pipe sample, so that the pipe sample and the rotating shaft are relatively fixed.

[0020] Preferably, the clamp assembly also includes a support body, which includes a support plate and a support ring fixedly connected to each other, the support body and the side wall of the rotating shaft are fixedly connected and located between the two clamping bodies, the support ring is for the pipeline sample to pass through, and the outer wall of the pipeline sample is in contact with the inner edge of the support ring.

[0021] The effect is that since the pipeline sample itself has an arc and is subjected to centrifugal force during rotation, the solid support body supports the pipeline sample in the middle of the pipeline sample through the support ring, thereby improving the state stability of the pipeline sample during rotation.

[0022] Preferably, the adjusting part includes an adjusting screw barrel and an adjusting bolt, one end of the adjusting screw barrel is hinged to the supporting fixed plate, the axis of the hinge shaft is parallel to the axis of the rotating shaft, the length direction of the adjusting screw barrel is perpendicular to its own hinge axis, an adjusting waist-shaped hole is provided on the connecting rotating plate, the length direction of the adjusting waist-shaped hole is radially of the rotating shaft, the adjusting bolt passes through the adjusting waist-shaped hole and is threadedly connected to the adjusting screw barrel, and the screw head of the adjusting bolt abuts against the connecting rotating plate.

[0023] The effect is that after the adjusting bolt and the adjusting screw barrel are threadedly connected, the distance between the screw head of the adjusting bolt and the supporting fixed plate can be adjusted. After the screw head abuts the connecting rotating plate, the abutting force exerted on the connecting rotating plate enables the clamping body to press against the pipeline sample. At the same time, since the adjusting screw barrel and the supporting fixed plate are hinged and the adjusting waist-shaped hole has horizontal space, the adjusting screw barrel and the adjusting bolt can adapt to different angles of the connecting rotating plate.

[0024] A testing method of the present invention based on the above-mentioned polyolefin composite wear-resistant pipe mortar wear rate testing machine comprises the following steps in sequence:

[0025] S1: Sample preparation: Prepare the pipeline sample, clean, dry and weigh it. The weight of the pipeline sample is calculated as m1, and the pipeline sample is clamped and fixed with a clamp assembly.

[0026] S2: Mortar preparation: Mix gravel of various particle sizes with water to prepare a mortar mixture, and add the mortar mixture into the mortar container in a certain amount;

[0027] S3: Impact test: Connect and install each mortar container containing the mortar mixture and each temperature-controlled cylinder shell, start the drive assembly, and each rotating shaft drives the pipe sample to rotate. The impact speed is set to 2-5m / s, and the action duration is set to 60min-120min. During this period, the inner cavity of the temperature-controlled cylinder shell continuously circulates constant temperature liquid, and the circulation of the constant temperature liquid regulates the intermittent axial movement of the temperature-controlled cylinder shell;

[0028] S4: Measurement and calculation: After the test is completed, the drive assembly stops, the mortar bucket and pipe sample are removed, the pipe sample is cleaned, dried, and weighed. The weight of the pipe sample is calculated as m2, and the wear rate is calculated as (m1-m2) / m1*100%.

[0029] By adopting the above technical solution, the beneficial effects of the present invention are:

[0030] The present invention adopts mortars with various particle sizes and an axially movable temperature-controlled shell and a mortar barrel. The temperature-controlled shell and the mortar barrel move synchronously, and the relative positions of the pipeline sample and the mortar barrel fixed by the clamp assembly on the rotating shaft are continuously changed. While the pipeline sample is in contact with the sand materials with various particle sizes, the temperature-controlled shell can also continuously and stably control the temperature of the mortar barrel. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of a polyolefin composite wear-resistant pipe mortar wear rate testing machine in an embodiment of the present invention.

[0032] Figure 2 It is a schematic cross-sectional view of the inner cavity communication structure of two adjacent temperature-control cylinder shells in an embodiment of the present invention.

[0033] Figure 3 It is a structural schematic diagram showing the case where the water pressure in the inner cavity of the temperature-control cylinder shell decreases and increases in pressure in the embodiment of the present invention.

[0034] Figure 4 It is a schematic cross-sectional view of the structure inside the mortar container in an embodiment of the present invention.

[0035] Figure 5 It is a schematic top view of the structure of the clamp assembly clamping the pipe sample in an embodiment of the present invention.

[0036] Figure 6 It is a schematic diagram of the overall structure of the clamp assembly in an embodiment of the present invention.

[0037] Figure 7 The present invention is a flow chart showing a method for testing the wear rate of polyolefin composite wear-resistant pipe mortar in an embodiment of the present invention.

[0038] Reference numerals:

[0039] 1. Frame; 11. Temperature control shell; 12. Pipe sample; 2. Rotating shaft; 21. Exhaust channel; 3. Mortar container; 31. Stabilizing core column; 4. Adjusting assembly; 41. Pressure infusion tube; 42. Guide piston column; 5. Driving assembly; 51. Driving motor; 52. Main drive pulley; 53. Torque pulley; 54. Transmission belt; 6. Clamp assembly; 61. Adjusting piece; 611. Adjusting screw; 612. Adjusting bolt; 62. Clamping body; 621. Connecting rotating plate; 622. Clamping collar; 623. Matching ring groove; 624. Adjusting waist-shaped hole; 63. Support body; 631. Support fixed plate; 632. Support collar. DETAILED DESCRIPTION

[0040] The following combination Figures 1 to 7 The present invention describes a polyolefin composite wear-resistant pipeline mortar wear rate testing machine and testing method.

[0041] This embodiment discloses a polyolefin composite wear-resistant pipe mortar wear rate testing machine, such as Figure 1 and Figure 2 As shown, it includes a frame 1, a drive assembly 5 and multiple rotating shafts 2. The rotating shafts 2 are rotatably set on the frame 1. Multiple mortar barrels 3 are also set on the frame 1. The mortar barrels 3 are used to hold a solid-liquid mixture of mortar and water. The rotating shafts 2 are used to carry the pipe sample 12 of the polyolefin composite wear-resistant pipe and rotate in the mortar barrel 3.

[0042] like Figure 1 As shown, in this embodiment, the number of rotating shafts 2 and mortar barrels 3 are six, and the two correspond one to one. The rotation axis of the rotating shaft 2 is vertical. The drive assembly 5 includes a drive motor 51, a torque pulley 53, and a transmission belt 54. The torque pulley 53 is coaxially fixedly connected to the rotating shaft 2. The drive motor 51 is fixedly connected to the frame 1. The output shaft of the drive motor 51 is coaxially connected to the main drive pulley 52. ​​The axis of the main drive pulley 52 is parallel to the axis of the rotating shaft 2. The six rotating shafts 2 are arranged in three rows and two columns on the frame 1. The torque pulley 53 and the main drive pulley 52 each have two belt winding grooves. The main drive pulley 52 and the two closest torque pulleys 53 achieve torque transmission through the transmission belt 54. The two adjacent torque pulleys 53 in each column also achieve torque transmission through the transmission belt 54. Therefore, when the drive motor 51 is started, all the rotating shafts 2 rotate synchronously.

[0043] like Figure 2 and Figure 3As shown, the mortar barrel 3 is mounted below the rotating shaft 2. A temperature-controlled shell 11 is provided on the frame 1 and outside each mortar barrel 3. The temperature-controlled shell 11 and the mortar barrel 3 are detachably connected. When connected, the outer wall of the mortar barrel 3 contacts the inner wall of the temperature-controlled shell 11. An annular cavity is defined within the temperature-controlled shell 11 for circulating a temperature-controlled liquid, which is water at a constant temperature. The mortar barrel 3 receives heat from the temperature-controlled shell 11, thereby maintaining a specific and relatively stable temperature for the mortar mixture within the mortar barrel 3. The mortar barrel 3 and the temperature-controlled shell 11 are threadedly connected. The opening of the mortar barrel 3 is formed with an external thread structure, and the major diameter of the thread at the opening of the mortar barrel 3 is smaller than the outer diameter of the mortar barrel 3, meaning that the opening of the mortar barrel 3 can enter the inner side of the temperature-controlled shell 11 from bottom to top.

[0044] like Figure 2 and Figure 3 As shown, the temperature-control shell 11 is slidably connected to the frame 1, and the sliding direction is the axial direction of the rotating shaft 2. The testing machine also includes an adjustment component 4, which is used to control the sliding of the temperature-control shell 11. The adjustment component 4 includes a guide piston rod 42 and a pressure infusion tube 41. The length direction of the guide piston rod 42 is parallel to the length direction of the rotating shaft 2. One end of the guide piston rod 42 is fixedly connected to the frame 1, and the other end passes through the temperature-control shell 11 from top to bottom and is located in the inner cavity of the temperature-control shell 11. When the temperature-control shell 11 moves, the length of the portion of the guide piston rod 42 extending into the space inside the temperature-control shell 11 continuously changes, that is, the spatial volume of the inner cavity of the temperature-control shell 11 also changes accordingly; the number of guide piston rods 42 corresponding to a single temperature-control shell 11 is four, and the four temperature-control shells 11 are arranged in an array around the circumference of the temperature-control shell 11. The two ends of the partial pressure infusion tube 41 are fixedly connected to different temperature-control shells 11, and the inner cavities of the six temperature-control shells 11 are connected in series through the pressure infusion tube 41. The end of the pressure infusion tube 41 at the end of the series liquid circuit, away from the temperature-controlled shell 11, is connected to a temperature-controlled liquid pump, i.e., a water pump system (not shown in the figure). The water pump system can control the water pressure in the inner cavity of each temperature-controlled shell 11 by controlling the water inlet and outlet flow rates, thereby causing the temperature-controlled shell 11 to move axially relative to the guide piston rod 42 through the action of pressure. For a single temperature-controlled shell 11, its water inlet end is located on the lower side wall, and its water outlet end is located on the upper side wall.

[0045] like Figure 4 、 Figure 5 and Figure 6As shown, the portion of the rotating shaft 2 within the mortar container 3 is provided with a clamp assembly 6, which is used to secure a pipe sample 12 relative to one side of the rotating shaft 2. During the test, the pipe sample 12 used is tubular. When the clamp assembly 6 clamps the pipe sample 12, the axis of the pipe sample 12 forms an arc centered on the axis of the rotating shaft 2. To ensure that the mortar mixture in the mortar container 3 fully enters the interior of the pipe sample 12, the arc angle of the trajectory of the pipe sample 12, as projected along the axial direction of the rotating shaft 2, must be greater than 75° and less than 150°. In this embodiment, 80° is used as an example.

[0046] like Figure 4 、 Figure 5 and Figure 6 As shown, the clamp assembly 6 includes an adjustment member 61, a support body 63, and two clamping bodies 62. The clamping bodies 62 are rotatably connected to the rotating shaft 2, with the rotation axis coinciding with the axis of the rotating shaft 2. The clamping bodies 62 include a connecting plate 621 and a clamping collar 622 fixedly connected to each other. The plate surface of the connecting plate 621 is parallel to the axis of the rotating shaft 2, and the clamping collar 622 is integrally formed on the side of the connecting plate 621 facing away from the rotating shaft 2. The pipe sample 12 is positioned between the two clamping bodies 62. The clamping collar 622 has a coaxial mating groove 623 coaxially defined on the side facing the pipe sample 12. The end of the pipe sample 12 is coaxially inserted into the mating groove 623, with the end face of the pipe sample 12 in abutting contact with the bottom of the mating groove 623. The inner diameter of the clamping collar 622 is larger than the inner diameter of the pipe sample 12. That is, during the rotation of the rotating shaft 2, the clamping collar 622 does not substantially interfere with the smooth entry of abrasive material into the space of the pipe sample 12. The adjusting member 61 is used to enable the clamping bodies 62 to generate an abutting force on the pipeline sample 12 , so that the two clamping bodies 62 clamp and fix the pipeline sample 12 .

[0047] like Figure 4 、 Figure 5 and Figure 6 As shown, the support body 63 includes a support plate 631 and a support collar 632, which are fixedly connected to each other. The support body 63 is fixedly connected to the side wall of the rotating shaft 2 and is located between the two clamping bodies 62. The surface of the support plate 631 is also parallel to the axis of the rotating shaft 2. The support collar 632 is integrally formed on the side of the support plate 631 away from the rotating shaft 2. The support collar 632 allows the pipe sample 12 to pass through, and the outer wall of the pipe sample 12 contacts the inner edge of the support collar 632. The support body 63 provides structural support for the middle portion of the pipe sample 12, which can improve the shape stability of the pipe sample 12 and the clamping stability of the clamp assembly 6 when the pipe sample 12 rotates at high speed.

[0048] like Figure 5 and Figure 6As shown, there are two adjusting members 61 and they are located on opposite sides of the supporting fixed plate 631; the adjusting member 61 includes an adjusting screw barrel 611 and an adjusting bolt 612. One end of the adjusting screw barrel 611 is hinged to the supporting fixed plate 631. The axis of the hinge shaft is parallel to the axis of the rotating shaft 2. The length direction of the adjusting screw barrel 611 is perpendicular to its own hinge axis, that is, its swinging direction is horizontal. An adjusting waist-shaped hole 624 that passes through its own plate thickness is provided on the connecting rotating plate 621. The length direction of the adjusting waist-shaped hole 624 is radially of the rotating shaft 2. The adjusting bolt 612 passes through the adjusting waist-shaped hole 624 and is threadedly connected to the adjusting screw barrel 611. When the screw head of the adjusting bolt 612 abuts against the side of the connecting rotating plate 621 facing away from the support body 63, the thrust applied by the screw head of the adjusting bolt 612 to the clamping body 62 serves as a force to make the clamping body 62 stably abut against the pipeline sample 12.

[0049] like Figure 1 and Figure 4 As shown, since the center of gravity of the clamp assembly 6 and the pipe sample 12 deviates from the axis of the rotating shaft 2, in order to improve the balance of the rotating shaft 2 during rotation, a stabilizing core column 31 is coaxially fixedly connected to the inner bottom wall of the mortar container 3. An exhaust channel 21 is coaxially opened on the rotating shaft 2, and the exhaust channel 21 passes through the opposite ends of the rotating shaft 2. During the installation of the mortar container 3 into the temperature-controlled cylindrical shell 11, the stabilizing core column 31 coaxially penetrates the lower end of the exhaust channel 21 from bottom to top, and the side wall of the stabilizing core column 31 contacts the inner wall of the exhaust channel 21. During the axial movement of the mortar container 3 relative to the rotating shaft 2, the stabilizing core column 31 is always in a hole-axis fit with the rotating shaft 2, so that the two have a high degree of coaxiality, and the rotational stability of the rotating shaft 2 is improved.

[0050] This embodiment also discloses a test method based on the above-mentioned polyolefin composite wear-resistant pipe mortar wear rate tester, such as Figure 7 As shown, the following steps are included in sequence:

[0051] S1: Sample preparation: Prepare a pipe sample 12, clean, dry, and weigh it. The weight of the pipe sample 12 is m1. Use a fixture assembly 6 to clamp and secure the pipe sample 12. In this embodiment, the pipe sample 12 has a length of 100 mm, an outer diameter of 50 mm, and a wall thickness of 5 mm.

[0052] S2: Mortar preparation: Sand of various particle sizes is mixed with water to prepare a mortar mixture, and the mortar mixture is quantitatively placed into the mortar container 3. In this embodiment, 12g of sand with a particle size of less than 0.1mm, 35g of sand with a particle size of 0.1-0.3mm, 35g of sand with a particle size of 0.3-0.5mm, and 18g of sand with a particle size greater than 0.5mm are weighed, and 80g of water is added and initially stirred;

[0053] S3: Impact test: Connect and install each mortar container 3 containing the mortar mixture and each temperature-controlled shell 11. Start the drive assembly 5. Each rotating shaft 2 drives the pipe sample 12 to rotate. The impact speed is set to 2.5m / s and the impact duration is set to 90min. During this time, the inner cavity of the temperature-controlled shell 11 continuously circulates a constant temperature liquid, and the circulation of the constant temperature liquid regulates the intermittent axial movement of the temperature-controlled shell 11.

[0054] S4: Measurement and calculation: After the test is completed, the drive assembly 5 stops, the mortar bucket 3 and the pipe sample 12 are removed, the pipe sample 12 is cleaned, dried, and weighed, and the weight of the pipe sample 12 is calculated as m2. The wear rate is calculated as (m1-m2) / m1*100%.

[0055] Although the embodiments of the present invention have been shown and described above, it can be understood that the textual descriptions and drawings of the above embodiments are exemplary and are intended to be used to explain the inventive concept of the present invention. They cannot be understood as limitations on the present invention. Those skilled in the art can change, modify, replace and modify the above embodiments within the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative work shall fall within the scope of protection of the present invention.

Claims

1. A polyolefin composite wear-resistant pipe mortar wear rate tester, comprising a frame, on which are mounted multiple mortar buckets and multiple rotating shafts, the rotating shafts being rotatably connected to the frame, one end of each rotating shaft extending into the mortar bucket and equipped with a clamp assembly for clamping the pipe sample, and a drive assembly for rotating the rotating shafts. It is characterized by: The rotating shaft and the mortar container are coaxial, and a temperature-control shell is connected to the frame and outside the mortar container. The temperature-control shell and the mortar container are detachably connected, and a temperature-control liquid flows in the temperature-control shell. The temperature-control shell also includes an adjustment component. The temperature-control shell and the frame are slidably connected, and the sliding direction is the axial direction of the rotating shaft. The adjustment component is used to control the sliding of the temperature-control shell. The adjustment assembly includes a guide piston rod and a pressure infusion tube. One end of the guide piston rod is fixedly connected to the frame, and the other end passes through the temperature control cylinder shell and is located in the inner cavity of the temperature control cylinder shell. The length direction of the guide piston rod is consistent with the sliding direction of the temperature control cylinder shell. The inner cavity of the temperature control cylinder shell is connected to the temperature control liquid pump through the pressure infusion tube. The pipe sample is tubular. When the clamp assembly clamps the pipe sample, the axis of the pipe sample is an arc with the axis of the rotating shaft as the center. In the axial projection along the rotating shaft, the arc angle range of the pipe sample's trajectory is 75°-150°. A stable core column is coaxially fixedly connected to the bottom wall of the mortar holding barrel, and an exhaust channel is coaxially opened on the rotating shaft. The exhaust channel runs through the opposite ends of the rotating shaft, and the stable core column coaxially penetrates one end of the exhaust channel and contacts the inner wall of the exhaust channel.

2. A polyolefin composite wear-resistant pipe mortar wear rate testing machine according to claim 1, characterized in that: The outer wall of the mortar containing barrel contacts the inner wall of the temperature control shell, the mortar containing barrel and the temperature control shell are threadedly connected, and the major diameter of the thread at the barrel mouth of the mortar containing barrel is smaller than the outer diameter of the mortar containing barrel.

3. A polyolefin composite wear-resistant pipe mortar wear rate testing machine according to claim 1 or 2, characterized in that: The drive assembly includes a drive motor, a torque pulley and a transmission belt. The output shaft of the drive motor is coaxially connected to a main drive pulley, the torque pulley is coaxially connected to a rotating shaft, and the transmission belt is wound between the main drive pulley and the torque pulley, or between the torque pulley and the torque pulley.

4. A polyolefin composite wear-resistant pipe mortar wear rate testing machine according to claim 1 or 2, characterized in that: The clamp assembly includes an adjusting piece and two clamping bodies, the clamping body is rotatably connected to the rotating shaft, and the rotation axis coincides with the axis of the rotating shaft. The clamping body includes a connecting rotating plate and a clamping collar that are fixedly connected to each other. A matching ring groove is coaxially provided on the clamping collar, and the end of the pipeline sample is coaxially inserted into the matching ring groove. The end face of the pipeline sample is in contact with the bottom of the matching ring groove. The adjusting piece is used to enable the clamping body to generate an abutting force on the pipeline sample.

5. A polyolefin composite wear-resistant pipe mortar wear rate testing machine according to claim 4, characterized in that: The clamp assembly also includes a support body, which includes a support plate and a support collar fixedly connected to each other. The support body is fixedly connected to the side wall of the rotating shaft and is located between the two clamping bodies. The support collar is for the pipeline sample to pass through, and the outer wall of the pipeline sample is in contact with the inner edge of the support collar.

6. A polyolefin composite wear-resistant pipe mortar wear rate testing machine according to claim 5, characterized in that: The adjusting part includes an adjusting screw barrel and an adjusting bolt. One end of the adjusting screw barrel is hinged to the supporting fixed plate. The axis of the hinge shaft is parallel to the axis of the rotating shaft. The length direction of the adjusting screw barrel is perpendicular to its own hinge axis. An adjusting waist-shaped hole is provided on the connecting rotating plate. The length direction of the adjusting waist-shaped hole is radially of the rotating shaft. The adjusting bolt passes through the adjusting waist-shaped hole and is threadedly connected to the adjusting screw barrel. The screw head of the adjusting bolt abuts against the connecting rotating plate.

7. A test method using the polyolefin composite wear-resistant pipe mortar wear rate tester according to claim 6, characterized in that: The steps are as follows: S1: Sample preparation: Prepare the pipeline sample, clean, dry and weigh it. The weight of the pipeline sample is calculated as m1, and the pipeline sample is clamped and fixed with a clamp assembly. S2: Mortar preparation: Mix gravel of various particle sizes with water to prepare a mortar mixture, and add the mortar mixture into the mortar container in a certain amount; S3: Impact test: Connect and install each mortar container containing the mortar mixture and each temperature-controlled cylinder shell, start the drive assembly, and each rotating shaft drives the pipe sample to rotate. The impact speed is set to 2-5m / s, and the action duration is set to 60min-120min. During this period, the inner cavity of the temperature-controlled cylinder shell continuously circulates constant temperature liquid, and the circulation of the constant temperature liquid regulates the intermittent axial movement of the temperature-controlled cylinder shell; S4: Measurement and calculation: After the test is completed, the drive assembly stops, the mortar bucket and pipe sample are removed, the pipe sample is cleaned, dried, and weighed. The weight of the pipe sample is calculated as m2, and the wear rate is calculated as / m1*100%.

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