Mortar wear rate testing machine and testing method for polyolefin composite wear-resistant pipeline

Abstract

The invention relates to the technical field of wear-resistant pipelines, and particularly discloses a polyolefin composite wear-resistant pipeline mortar wear rate testing machine and a testing method.The testing machine comprises a rack and an adjusting assembly, the rack is provided with a plurality of mortar containing barrels and a rotating shaft rod, and the rotating shaft rod is rotationally connected with the rack; one end of the rotating shaft rod extends into the mortar containing barrel and is provided with a clamp assembly, and the rack is further provided with a driving assembly used for driving the rotating shaft rod to rotate. The rotating shaft rod and the mortar containing barrel are coaxial, the rack is connected with a temperature control barrel shell, the temperature control barrel shell is connected with the mortar containing barrel, temperature control liquid flows in the temperature control barrel shell, the temperature control barrel shell is slidably connected with the rack, the sliding direction is the axial direction of the rotating shaft rod, and the adjusting assembly is used for enabling the temperature control barrel shell to slide. By means of the adjusting assembly, when a pipeline sample rotates in the mortar containing barrel, the mortar containing barrel moves in the axial direction, the pipeline sample makes contact with sand of different particle sizes, and the authenticity of the detection process and the accuracy of the result are improved.

Description

Technical Field

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

[0002] Wear-resistant pipes are applied in the fields of material transmission such as pneumatic conveying and pumping of slurries. Due to the characteristics of the conveying medium such as high hardness, high flow rate, and large flow, the pipe wall is impacted, worn, and corroded for a long time, resulting in ordinary pipes being easily worn through and their service life being shortened. Polyolefin composite wear-resistant pipes are high-performance wear-resistant pipes with a polyolefin wear-resistant material as the wear-resistant layer, which are composite-molded with the base pipe by coextrusion, suitable for long-term operation, and having wear resistance requirements for conveying, and are used to transport various liquids, slurries, and granular solids.

[0003] The mortar wear test is a method for detecting the wear resistance of a material, and a mortar wear testing machine is required for operation. A mortar testing machine is disclosed in a patent document with the publication number CN101710052B, which discloses a testing method for the wear resistance of ultra-high molecular weight polyethylene. The mortar testing machine includes a wear test container, grinding mortar, a baffle, a fixing fixture, a rotating shaft rod, a sample plate, and a cooling jacket. The upper part of the rotating shaft rod is connected to the wear test container, and the lower part of the rotating shaft rod is connected to the fixing fixture. The sample plate 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 into the experimental container, and the lower end of the rotating shaft rod extends into the grinding mortar and drives the sample plate to rotate. The cooling jacket is sleeved outside the grinding experimental container, and the internal space of the cooling jacket is used to introduce a constant-temperature liquid to keep the internal space of the wear experimental container at a stable specific temperature condition as much as possible.

[0004] Since the wear test container contains a solid-liquid mixture, the rotating shaft rod with the sample plate plays the role of a stirring paddle during rotation. Without replacing the used quartz sand material, under the condition of uniform rotation, quartz sand with different particle sizes tends to be stable in the height space in the container, and the density distribution of the mixture in the axial direction of the container also tends to be stable but uneven, resulting in a large singularity of the quartz sand material contacted by the sample plate, and insufficient contact of the sand material with too large or too small particle sizes with the sample plate. 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 mortar wear rate testing machine and a testing method for polyolefin composite wear-resistant pipes, aiming to solve the problem of relatively low reference value of the test result caused by the singularity of the sand material contacted by the sample plate in the related art.

[0006] A polyolefin composite wear-resistant pipeline mortar wear rate testing machine of the present invention includes a frame. A plurality of mortar containers and a plurality of rotating shafts are provided on the frame. The rotating shafts are rotatably connected to the frame. One end of the rotating shaft extends into the mortar container and is provided with a fixture assembly for clamping a pipeline sample. A driving assembly for driving the rotating shaft to rotate is also provided on the frame; the rotating shaft and the mortar container are coaxial. A temperature control cylinder shell is connected to the outside of the mortar container on the frame. The temperature control cylinder shell and the mortar container are detachably connected. A temperature control liquid circulates in the temperature control cylinder shell. An adjusting assembly is also included. The temperature control cylinder shell is slidably connected to the frame, and the sliding direction is the axial direction of the rotating shaft. The adjusting assembly is used to control the sliding of the temperature control cylinder shell.

[0007] The effect is as follows: The rotating shaft drives the pipeline sample to rotate in the mortar container filled with mortar. During the rotation process, the moving direction of the pipeline sample is the circumferential direction of the mortar container. A liquid at a specific temperature is continuously introduced into the temperature control cylinder shell to make the mortar container inside it have stable temperature conditions; after the mortar in the mortar container is stirred by the fixture assembly and the pipeline sample, it also forms a rotational movement trend. Sand grains with different particle sizes are regularly distributed in the axial direction of the mortar container. When the temperature control cylinder shell moves along the axial direction of the rotating shaft, the mortar container and the mortar inside it also move synchronously. At this time, the relative positions of the mortar container, the rotating shaft, and the pipeline sample on the rotating shaft also change. Under the condition of constant rotational speed, the pipeline sample can collide and contact with sand grains at different axial positions, that is, the contact sufficiency between the pipeline sample and the sand material is improved, and the test results can also be more accurate.

[0008] Preferably, the adjusting assembly includes a guiding piston column and a pressure infusion pipe. One end of the guiding 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 guiding piston column is consistent with the sliding direction of the temperature control cylinder shell. The inner cavity of the temperature control cylinder shell is connected to a temperature control liquid pump through the pressure infusion pipe.

[0009] The effect is as follows: The temperature control liquid pump infuses or pumps liquid into the inner cavity of the temperature control cylinder shell through the pressure infusion pipe. By controlling the water inflow rate and the water outflow rate, the water pressure in the inner cavity of the temperature control cylinder shell is controlled, so that the temperature control cylinder shell can move axially relative to the guiding piston column through the pressure effect.

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

[0011] The effect is that when the mortar container is installed into the temperature control cylinder shell with its opening facing upward and from bottom to top, the threaded structure at the opening of the mortar container will not obstruct the process of the mortar container entering the temperature control cylinder shell.

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

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

[0014] Preferably, the pipeline sample is tubular. When the fixture assembly clamps the pipeline sample, the axis of the pipeline sample is an arc centered on the axis of the rotating shaft rod. In the projection along the axial direction of the rotating shaft rod, 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 its extending trajectory coincides with its rotating trajectory, so that to a certain extent, the situation of mortar flowing through the pipeline can be simulated, and the feedback authenticity of the detection test can be improved.

[0016] Preferably, a stabilizing core column is coaxially and fixedly connected to the inner bottom wall of the mortar container. An exhaust channel is coaxially opened on the rotating shaft rod, and the exhaust channel penetrates through the opposite ends of the rotating shaft rod. The stabilizing core column coaxially penetrates into one end of the exhaust channel and contacts the inner wall of the exhaust channel.

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

[0018] Preferably, the fixture assembly includes an adjusting member and two clamping bodies. The clamping body is rotatably connected to the rotating shaft rod, and the rotation axis coincides with the axis of the rotating shaft rod. The clamping body includes a connecting rotating plate and a clamping collar that are fixedly connected to each other. A mating ring groove is coaxially opened on the clamping collar. The end of the pipeline sample is coaxially inserted into the mating ring groove, and the end face of the pipeline sample is in close contact with the bottom of the mating ring groove. The adjusting member is used to make the clamping body generate a pressing force on the pipeline sample.

[0019] The effect is as follows: It cooperates with the end face of the annular groove and the pipeline sample to make the end of the pipeline sample and the clamping body have relative stability. The two clamping bodies respectively clamp the pipeline sample in opposite directions at both ends of the pipeline sample, so that the pipeline sample and the rotating shaft rod are relatively fixed.

[0020] Preferably, the fixture assembly further includes a support body, which includes a support fixed plate and a support collar fixedly connected to each other. The support body is fixedly connected to the side wall of the rotating shaft rod 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 contacts the inner edge of the support collar.

[0021] The effect is as follows: Since the pipeline sample itself has a curvature and is subject to centrifugal force during rotation, the support body supports the pipeline sample in the middle through the support collar, improving the state stability of the pipeline sample during rotation.

[0022] Preferably, the adjusting member includes an adjusting screw cylinder and an adjusting bolt. One end of the adjusting screw cylinder is hinged to the support fixed plate. The axis of the hinge shaft is parallel to the axis of the rotating shaft rod. The length direction of the adjusting screw cylinder is perpendicular to its own hinge axis. An adjusting waist-shaped hole is formed on the connecting rotating plate. The length direction of the adjusting waist-shaped hole is the radial direction of the rotating shaft rod. The adjusting bolt passes through the adjusting waist-shaped hole and is threadedly connected to the adjusting screw cylinder. The screw head of the adjusting bolt abuts against the connecting rotating plate.

[0023] The effect is as follows: After the adjusting bolt is threadedly connected to the adjusting screw cylinder, the distance between the screw head of the adjusting bolt and the support fixed plate can be adjusted. The abutting force exerted on the connecting rotating plate by the screw head after abutting enables the clamping body to tightly hold the pipeline sample. At the same time, since the adjusting screw cylinder is hinged to the support fixed plate and the adjusting waist-shaped hole has a lateral space, the adjusting screw cylinder and the adjusting bolt can adapt to different angles of the connecting rotating plate.

[0024] A test method of the above-mentioned polyolefin composite wear-resistant pipeline mortar wear rate testing machine of the present invention successively includes the following steps: S1: Sample preparation: Prepare a pipeline sample, clean, dry, and weigh the pipeline sample. The weight of the pipeline sample is recorded as m1, and the pipeline sample is clamped and fixed by the fixture assembly; S2: Mortar preparation: Mix gravel with various particle sizes and water to prepare a mortar mixture, and quantitatively place the mortar mixture into the mortar holding bucket; S3: Impact test: Connect and install each mortar holding bucket containing the mortar mixture and each temperature control cylinder shell. Start the driving assembly. Each rotating shaft rod drives the pipeline sample to rotate. Set the impact speed to 2 - 5 m / s and the action duration to 60 min - 120 min. During this period, a constant temperature liquid continuously circulates in the inner cavity of the temperature control cylinder shell, and the intermittent axial movement of the temperature control cylinder shell is adjusted through the circulation of the constant temperature liquid; S4: Measurement and calculation: After the test is completed and the driving component stops, remove the mortar container and the pipeline sample, clean, dry, and weigh the pipeline sample. The weight of the pipeline sample is recorded as m2, and calculate the wear rate = (m1 - m2) / m1 * 100%.

[0025] By adopting the above technical solutions, the beneficial effects of the present invention are as follows: By adopting mortars with various particle sizes, a temperature control cylinder shell and a mortar container that can move axially, the temperature control cylinder shell and the mortar container move synchronously, and the relative positions of the pipeline sample fixed on the rotating shaft rod by the fixture assembly and the mortar container are constantly changing. While the pipeline sample is in contact with sand materials of various particle sizes, the temperature control effect of the temperature control cylinder shell on the mortar container can also be carried out continuously and stably. Description of the Drawings

[0026] Figure 1 It is a schematic diagram of the overall structure of the polyolefin composite wear-resistant pipeline mortar wear rate testing machine in the embodiment of the present invention.

[0027] Figure 2 It is a schematic cross-sectional view of the internal cavity communication structure of two adjacent temperature control cylinder shells in the embodiment of the present invention.

[0028] Figure 3 It is a schematic diagram of the structure when the temperature control cylinder shell rises due to the decrease in the water pressure in its internal cavity in the embodiment of the present invention.

[0029] Figure 4 It is a schematic cross-sectional view of the internal structure of the mortar container in the embodiment of the present invention.

[0030] Figure 5 It is a schematic top view of the structure when the fixture assembly clamps the pipeline sample in the embodiment of the present invention.

[0031] Figure 6 It is a schematic diagram of the overall structure of the fixture assembly in the embodiment of the present invention.

[0032] Figure 7 It is a schematic flow chart of the polyolefin composite wear-resistant pipeline mortar wear rate test method in the embodiment of the present invention.

[0033] Reference Signs: 1. Frame; 11. Temperature control cylinder shell; 12. Pipeline sample; 2. Rotating shaft rod; 21. Exhaust passage; 3. Mortar container; 31. Stable core column; 4. Adjusting assembly; 41. Pressure infusion pipe; 42. Guide piston column; 5. Driving assembly; 51. Driving motor; 52. Main driving pulley; 53. Torque pulley; 54. Transmission belt; 6. Clamping assembly; 61. Adjusting member; 611. Adjusting screw barrel; 612. Adjusting bolt; 62. Clamping body; 621. Connecting rotating plate; 622. Clamping collar; 623. Matching annular groove; 624. Adjusting waist-shaped hole; 63. Supporting body; 631. Supporting fixed plate; 632. Supporting collar. Detailed implementation manner

[0034] The following combines Figures 1 to 7 to describe a polyolefin composite wear-resistant pipeline mortar wear rate testing machine and a testing method of the present invention.

[0035] This embodiment discloses a polyolefin composite wear-resistant pipeline mortar wear rate testing machine. As Figure 1 and Figure 2 shown, it includes a frame 1, a driving assembly 5 and a plurality of rotating shaft rods 2. The rotating shaft rods 2 are rotatably arranged on the frame 1. A plurality of mortar containers 3 are also arranged on the frame 1. The mortar containers 3 are used to hold the solid-liquid mixture of mortar and water. The rotating shaft rods 2 are used to carry the pipeline sample 12 of the polyolefin composite wear-resistant pipeline and rotate in the mortar containers 3.

[0036] As Figure 1 shown, in this embodiment, the number of both the rotating shaft rods 2 and the mortar containers 3 is six and they correspond one by one. The rotation axis of the rotating shaft rods 2 is in the vertical direction. The driving assembly 5 includes a driving motor 51, a torque pulley 53 and a transmission belt 54. The torque pulley 53 is coaxially and fixedly connected to the rotating shaft rod 2. The driving motor 51 is fixedly connected to the frame 1. A main driving pulley 52 is coaxially connected to the output shaft of the driving motor 51. The axis of the main driving pulley 52 is parallel to the axis of the rotating shaft rod 2. The six rotating shaft rods 2 are arranged in three rows and two columns on the frame 1. Two belt grooves are provided on both the torque pulley 53 and the main driving pulley 52. The main driving pulley 52 and the two closest torque pulleys 53 achieve torque transmission through the transmission belt 54. The adjacent two torque pulleys 53 in each column also achieve torque transmission through the transmission belt 54. Thus, when the driving motor 51 is started, all the rotating shaft rods 2 rotate synchronously.

[0037] As 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.

[0038] 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. like Figure 4 、 Figure 5 and Figure 6As shown, a fixture assembly 6 is provided on the part of the rotary shaft rod 2 inside the mortar containing barrel 3. The fixture assembly 6 is used to relatively fix the pipe sample 12 on one side of the rotary shaft rod 2. During the detection test, the pipe sample 12 used is tubular. When the fixture assembly 6 clamps the pipe sample 12, the axis of the pipe sample 12 is an arc with the axis of the rotary shaft rod 2 as the center of the circle. In order to enable the mortar mixture in the mortar containing barrel 3 to fully enter the inside of the pipe sample 12, in the projection along the axial direction of the rotary shaft rod 2, the arc angle of the trajectory of the pipe sample 12 needs to be greater than 75° and less than 150°. In this embodiment, 80° is taken as an example.

[0039] As Figure 4 , Figure 5 and Figure 6 As shown, the fixture assembly 6 includes an adjusting member 61, a support body 63 and two clamping bodies 62. The clamping body 62 is rotatably connected to the rotary shaft rod 2, and the rotation axis coincides with the axis of the rotary shaft rod 2. The clamping body 62 includes a connecting rotating plate 621 and a clamping collar 622 which are fixedly connected to each other. The plate surface of the connecting rotating plate 621 is parallel to the axis of the rotary shaft rod 2, and the clamping collar 622 is integrally formed on the side of the connecting rotating plate 621 away from the rotary shaft rod 2. The pipe sample 12 is located between the two clamping bodies 62. A mating ring groove 623 is coaxially formed on the side of the clamping collar 622 facing the pipe sample 12. The end of the pipe sample 12 is coaxially inserted into the mating ring groove 623, and the end face of the pipe sample 12 is in close contact with the bottom of the mating ring 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 rotary shaft rod 2, the clamping collar 622 basically does not affect the smooth entry of the sand material into the space of the pipe sample 12. The adjusting member 61 is used to make the clamping body 62 generate an abutting force on the pipe sample 12, so that the two clamping bodies 62 clamp and fix the pipe sample 12.

[0040] As Figure 4 , Figure 5 and Figure 6 As shown, the support body 63 includes a support fixed 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 rotary shaft rod 2 and is located between the two clamping bodies 62. The plate surface of the support fixed plate 631 is also parallel to the axis of the rotary shaft rod 2, and the support collar 632 is integrally formed on the side of the support fixed plate 631 away from the rotary shaft rod 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 forms a structural support for the middle part of the pipe sample 12, and can improve the morphological stability of the pipe sample 12 and the clamping stability of the fixture assembly 6 to it under the state of high-speed rotation of the pipe sample 12.

[0041] As Figure 5 and Figure 6As shown, there are two adjusting members 61, which are respectively located on the opposite sides of the supporting fixed plate 631; the adjusting member 61 includes an adjusting screw cylinder 611 and an adjusting bolt 612. One end of the adjusting screw cylinder 611 is hinged to the supporting fixed plate 631. The axis of the hinge shaft is parallel to the axis of the rotating shaft rod 2. The length direction of the adjusting screw cylinder 611 is perpendicular to its own hinge axis, that is, its swinging direction is horizontal. An adjusting waist-shaped hole 624 penetrating the plate thickness of the connecting rotating plate 621 is provided. The length direction of the adjusting waist-shaped hole 624 is the radial direction of the rotating shaft rod 2. The adjusting bolt 612 passes through the adjusting waist-shaped hole 624 and is threadedly connected to the adjusting screw cylinder 611. When the screw head of the adjusting bolt 612 abuts against the side of the connecting rotating plate 621 facing away from the supporting body 63, the thrust exerted by the screw head of the adjusting bolt 612 on the clamping body 62 serves as the force for the clamping body 62 to stably abut against the pipeline sample 12.

[0042] As Figure 1 and Figure 4 shown, since the centers of gravity of the fixture assembly 6 and the pipeline sample 12 deviate from the axis of the rotating shaft rod 2, in order to improve the balance during the rotation of the rotating shaft rod 2, a stabilizing core column 31 is coaxially and fixedly connected to the inner bottom wall of the mortar holding barrel 3. An exhaust passage 21 is coaxially provided on the rotating shaft rod 2, and the exhaust passage 21 penetrates through the opposite ends of the rotating shaft rod 2. During the process of installing the mortar holding barrel 3 onto the temperature control cylinder shell 11, the stabilizing core column 31 coaxially penetrates into the lower port of the exhaust passage 21 from bottom to top, and the side wall of the stabilizing core column 31 contacts the inner wall of the exhaust passage 21; during the axial movement of the mortar holding barrel 3 relative to the rotating shaft rod 2, the stabilizing core column 31 and the rotating shaft rod 2 are always in a hole-shaft fit state, so that the two have a high coaxiality, and the rotation stability of the rotating shaft rod 2 is improved.

[0043] This embodiment also discloses a test method based on the above-mentioned polyolefin composite wear-resistant pipeline mortar wear rate testing machine. As Figure 7 shown, it successively includes the following steps: S1: Sample preparation: Prepare the pipeline sample 12, clean, dry, and weigh the pipeline sample 12. The weight of the pipeline sample 12 is recorded as m1, and the pipeline sample 12 is clamped and fixed by the fixture assembly 6. In this embodiment, the length of the pipeline sample 12 is 100 mm, the outer diameter is 50 mm, and the wall thickness is 5 mm; S2: Mortar preparation: Mix various particle sizes of sand and gravel with water to prepare a mortar mixture, and quantitatively place the mortar mixture into the mortar holding barrel 3. In this embodiment, weigh 12 g of sand grains with a particle size less than 0.1 mm, 35 g of sand grains with a particle size between 0.1 - 0.3 mm, 35 g of sand grains with a particle size between 0.3 - 0.5 mm, 18 g of sand grains with a particle size greater than 0.5 mm, and add 80 g of water for preliminary stirring; S3: Impact test: Connect and install the mortar buckets 3 containing the mortar mixture and the temperature control cylinder shells 11. Start the drive assembly 5, and the rotating shaft rods 2 drive the pipeline samples 12 to rotate. Set the impact speed to 2.5 m / s and the action duration to 90 min. During this period, the constant-temperature liquid continuously circulates in the inner cavity of the temperature control cylinder shell 11, and the intermittent axial movement of the temperature control cylinder shell 11 is adjusted through the circulation of the constant-temperature liquid; S4: Measurement and calculation: After the test ends, stop the drive assembly 5, remove the mortar buckets 3 and the pipeline samples 12, clean, dry, and weigh the pipeline samples 12. The weight of the pipeline sample 12 is recorded as m2, and calculate the wear rate = (m1 - m2) / m1 * 100%.

[0044] Although the embodiments of the present invention have been shown and described above, it can be understood that the textual descriptions and the content of the drawings of the above embodiments are all exemplary and are intended to explain the inventive concept of the present invention, and should not be construed as a limitation to the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention; based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

Claims

1. A polyolefin composite wear-resistant pipeline mortar wear rate testing machine, comprising a frame (1), on which a plurality of mortar holding barrels (3) and a plurality of rotating shaft rods (2) are provided. The rotating shaft rods (2) are rotatably connected to the frame (1). One end of the rotating shaft rod (2) extends into the mortar holding barrel (3) and is provided with a fixture assembly (6) for clamping a pipeline sample (12). The frame (1) is also provided with a driving assembly (5) for driving the rotating shaft rod (2) to rotate. Characterized in that, The rotating shaft rod (2) and the mortar holding barrel (3) are coaxial. A temperature control cylinder shell (11) is connected to the outside of the mortar holding barrel (3) on the frame (1). The temperature control cylinder shell (11) and the mortar holding barrel (3) are detachably connected. A temperature control liquid circulates in the temperature control cylinder shell (11). It also includes an adjusting assembly (4). The temperature control cylinder shell (11) is slidably connected to the frame (1) in the axial direction of the rotating shaft rod (2). The adjusting assembly (4) is used to control the sliding of the temperature control cylinder shell (11).

2. The polyolefin composite wear-resistant pipeline mortar wear rate testing machine according to claim 1, characterized in that, The adjusting assembly (4) includes a guiding piston column (42) and a pressure infusion pipe (41). One end of the guiding piston column (42) is fixedly connected to the frame (1), and the other end passes through the temperature control cylinder shell (11) and is located in the inner cavity of the temperature control cylinder shell (11). The length direction of the guiding piston column (42) is consistent with the sliding direction of the temperature control cylinder shell (11). The inner cavity of the temperature control cylinder shell (11) is connected to a temperature control liquid pump through the pressure infusion pipe (41).

3. The polyolefin composite wear-resistant pipeline mortar wear rate testing machine according to claim 2, wherein, The outer wall of the mortar holding barrel (3) contacts the inner wall of the temperature control cylinder shell (11). The mortar holding barrel (3) and the temperature control cylinder shell (11) are threadedly connected. The major diameter of the thread at the mouth of the mortar holding barrel (3) is smaller than the outer diameter of the mortar holding barrel (3).

4. A polyolefin composite wear-resistant pipeline mortar wear rate testing machine according to any one of claims 1-3, characterized in that, The driving assembly (5) includes a driving motor (51), a torque pulley (53) and a transmission belt (54). A main driving pulley (52) is coaxially connected to the output shaft of the driving motor (51). The torque pulley (53) is coaxially connected to the rotating shaft rod (2). The transmission belt (54) is wound between the main driving pulley (52) and the torque pulley (53), or between the torque pulley (53) and the torque pulley (53).

5. A polyolefin composite wear-resistant pipeline mortar wear rate testing machine according to any one of claims 1-3, characterized in that, The pipeline sample (12) is tubular. When the fixture assembly (6) clamps the pipeline sample (12), the axis of the pipeline sample (12) is an arc centered on the axis of the rotating shaft rod (2). In the projection along the axial direction of the rotating shaft rod (2), the arc angle range of the trajectory of the pipeline sample (12) is 75° - 150°.

6. The mortar wear rate testing machine for a polyolefin composite wear-resistant pipeline according to claim 5, characterized in that, A stabilizing core column (31) is coaxially and fixedly connected to the inner bottom wall of the mortar holding barrel (3). An exhaust channel (21) is coaxially opened on the rotating shaft rod (2). The exhaust channel (21) penetrates through the opposite ends of the rotating shaft rod (2). The stabilizing core column (31) coaxially penetrates into one end of the exhaust channel (21) and contacts the inner wall of the exhaust channel (21).

7. An abrasive wear rate testing machine for polyolefin composite wear-resistant pipes according to claim 5, characterized in that, The clamp assembly (6) includes an adjusting member (61) and two clamping bodies (62), the clamping body (62) is rotatably connected to the rotating shaft (2), and the rotation axis coincides with the axis of the rotating shaft (2), the clamping body (62) includes a connecting rotating plate (621) and a clamping collar (622) fixedly connected to each other, a matching annular groove (623) is coaxially provided on the clamping collar (622), the end of the pipeline sample (12) is coaxially inserted into the matching annular groove (623), the end face of the pipeline sample (12) is in contact with the bottom of the matching annular groove (623), and the adjusting member (61) is used to enable the clamping body (62) to generate abutting force on the pipeline sample (12).

8. The polyolefin composite wear-resistant pipeline mortar wear rate testing machine according to claim 7, characterized in that The clamp assembly (6) further includes a support body (63), the support body (63) including a support plate (631) and a support collar (632) fixedly connected to each other, the support body (63) and the side wall of the rotating shaft (2) are fixedly connected and located between the two clamping bodies (62), the support collar (632) allows the pipeline sample (12) to pass through, and the outer wall of the pipeline sample (12) contacts the inner edge of the support collar (632).

9. The polyolefin composite wear-resistant pipeline mortar wear rate testing machine according to claim 8, characterized in that, 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, an adjusting waist-shaped hole (624) 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), and the screw head of the adjusting bolt (612) abuts against the connecting rotating plate (621).

10. A test method for a mortar wear rate testing machine of a polyolefin composite wear-resistant pipeline according to any one of claims 5-9, characterized in that, The steps are as follows: S1: Sample preparation: preparing a pipeline sample (12), cleaning, drying, and weighing the pipeline sample (12), wherein the weight of the pipeline sample (12) is calculated as m1, and clamping and fixing the pipeline sample (12) using a clamp assembly (6); S2: Mortar preparation: Sand and gravel of various particle sizes are mixed with water to prepare a mortar mixture, and the mortar mixture is quantitatively placed into a mortar container (3); S3: Impact test: connect and install each mortar container (3) containing the mortar mixture and each temperature-controlled shell (11), start the driving assembly (5), and each rotating shaft (2) drives the pipe sample (12) to rotate. The impact speed is set to 2-5m / s, and the action time is set to 60min-120min. During this period, the inner cavity of the temperature-controlled shell (11) continuously circulates the constant temperature liquid, and the intermittent axial movement of the temperature-controlled shell (11) is adjusted by the circulation of the constant temperature liquid; 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%.

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