Jet type erosive wear testing machine

Abstract

The invention discloses a jet type erosive wear testing machine, and relates to the technical field of testing facilities. The device comprises a test bench with a test area, and a water supply system and a sand supply system aiming at the test area, the water supply system comprises a water supply pipe, the sand supply system comprises a sand tank, a turntable with an annular sand conveying groove on the upper surface is arranged below a sand discharge pipe of the sand tank, and the turntable is connected with the sand discharge pipe of the sand tank. A pipe opening of the sand discharging pipe corresponds to the sand conveying groove in position, and the end face of the pipe opening is slidably connected with the upper surface of the turntable; the turntable is connected with a driving motor. The sand supply system is provided with the rotating disc, the sand conveying groove is formed in the rotating disc to convey sand grains, and the sand grains are conveyed to the mixer along the sand supply pipe through kinetic energy of airflow; the rotating disc can uniformly convey sand grains through the sand conveying groove in the rotating disc, and the rotating speed of the rotating disc can be adjusted according to the water flow during use, so that the number of the sand grains entering the spray pipe can be controlled, and the sand supply pipe can stably and adjustably output the sand grains.

Description

Technical Field

[0001] The present invention relates to a jet erosion wear testing machine, belonging to the technical field of test facilities. Background Art

[0002] Two-phase flow erosion is the main working condition faced by oilfield drilling and production equipment during service. When the equipment suffers from erosion wear failure, it will lead to frequent replacement of the equipment, prolong the production cycle, and increase the production cost. Therefore, it is necessary to simulate the experiment of spraying a water-sand two-phase flow onto the surface of a workpiece for erosion wear under actual working conditions.

[0003] Currently, the commonly used erosion wear test equipment mainly includes a jet erosion wear testing machine and a rotary erosion wear testing machine. The jet erosion wear testing machine mainly sprays a water-sand two-phase flow at high speed onto the surface of a workpiece for erosion wear. Among them, the mixing method of water and sand particles is divided into two types. One is to fully mix water and sand in a liquid storage tank through a stirring device, and then suck the mixed liquid into a pipeline through a mud sand pump, and then conduct erosion wear on the specimen. In this mixing method, the mud sand pump is prone to blockage and failure, affecting the normal operation of the test. The other mixing method of water and sand particles is that the sand material is fed into the mixing chamber through a funnel and a conveyor belt. The high-speed jet stream mixes with the sand material in the mixing chamber and conducts erosion wear on the specimen through a pipeline. This method relies on the conveyor belt to deliver sand, and the sand delivery volume cannot be accurately controlled, resulting in pipeline blockage, inability to continuously deliver sand particles, and large errors in erosion wear data. Summary of the Invention

[0004] The purpose of the present invention is to design a jet erosion wear testing machine that can avoid pipeline blockage during the erosion process.

[0005] The present invention includes a test bench with a test area, as well as a water supply system and a sand supply system for the test area. The water supply system includes a water supply pipe, and the sand supply system includes a sand tank. A turntable with an annular sand delivery groove on its upper surface is arranged below the sand discharge pipe of the sand tank. The pipe orifice of the sand discharge pipe corresponds to the position of the sand delivery groove, and the end face of the pipe orifice is slidably connected to the upper surface of the turntable. The turntable is connected to a driving motor. The turntable is located inside a turntable box. An outlet is arranged on the upper plate surface of the turntable box. The pipe orifice of the outlet corresponds to the position of the sand delivery groove and there is a spacing between the pipe orifice and the plane where the upper surface of the turntable is located. An air inlet connected to an air compressor is also arranged on the turntable box. The water supply pipe and the sand supply pipe connected to the outlet on the turntable box both lead to a mixer, and the discharge port of the mixer leads to the test area.

[0006] Further, there are gaps between the lower plate surface, the upper plate surface and the side surface of the turntable box and the turntable, thus forming an air flow channel; the inlet end of the sand supply pipe leads into the turntable box, and its position is above the sand supply groove at the working position, and its opening area is smaller than the transverse area of the sand supply groove, and the distance between the lower port of the sand supply pipe and the plane of the upper surface of the turntable is smaller than the distance between the upper surface of the turntable and the lower surface of the upper plate of the turntable box.

[0007] Further, a buffer tank is arranged in the middle of the sand pipe, and the buffer tank is a hopper-shaped tank body.

[0008] Further, a workbench is arranged at the test bench, the workbench is arranged in the box body, there is a gap between the workbench and the box body wall, a second water tank is formed between the workbench and the lower bottom of the box body, the lower bottom of the second water tank is communicated with the lower part of the third water tank through a pipeline, and the lower part of the third water tank is connected with the first water tank through a circulating pipe connecting the second water pump; a water supply pipe connecting the first water pump is arranged at the lower bottom of the first water tank, and the first water tank is the water source of the water supply pipe.

[0009] Further, the test bench includes a base fixed on the workbench, the upper surface of the base is an arc surface, the fuselage is provided with an arc-shaped part whose lower surface matches the upper surface of the base, and a first clamping part is arranged at the upper end of the arc-shaped part; gaskets are respectively arranged above both sides of the arc-shaped part of the fuselage, one end of each gasket is located above the arc-shaped part of the fuselage, and the other end is fixedly connected with the base through a bolt; the fuselage is also provided with an adjusting mechanism, and the adjusting mechanism includes a nut base arranged on the fuselage, a screw rod passes through the nut base, one end of the screw rod is connected with a handle, and the other end is connected with a second clamping part corresponding to the first clamping part.

[0010] Further, there is a fence covering the test bench above the box body, the lower part of the mixer passes through the upper plate surface of the fence, and its discharge port is located inside the fence.

[0011] Further, the workbench successively includes a first support plate, a second support plate, a third support plate and a fourth support plate from bottom to top. An elevating mechanism is arranged between the first support plate and the second support plate, a Y-direction moving mechanism of the third support plate is arranged between the second support plate and the third support plate, an X-direction moving mechanism of the fourth support plate is arranged between the third support plate and the fourth support plate, and the X-direction moving mechanism and the Y-direction moving mechanism are perpendicular to each other.

[0012] Further, a second baffle is arranged in the third water tank to divide its inner cavity into a front cavity and a rear cavity. The front cavity is divided into left and right cavities by a vertical first baffle. The inlet of the third water tank is located at the lower part of the right cavity, and the outlet is located at the lower part of the rear cavity; the peripheries of the first baffle and the second baffle are fixedly connected with the inner wall of the third water tank through spaced welding points, so as to form a flow gap around the first baffle and the second baffle.

[0013] Furthermore, the mixer includes a water storage chamber and a nozzle at the bottom of the water storage chamber. The sand supply pipe passes through the middle of the nozzle and forms an acute angle with the nozzle.

[0014] In the sand supply system of the present invention, a turntable is provided. The turntable is provided with sand delivery grooves to convey sand grains, and the kinetic energy of the air flow is used to convey the sand grains along the sand supply pipe to the mixer. The sand delivery grooves on the turntable can enable the turntable to evenly convey sand grains. During use, the rotation speed of the turntable can be adjusted according to the size of the water flow to control the number of sand grains entering the nozzle, so that the sand supply pipe can stably and adjustably output sand grains. In the water delivery system of the present invention, a pressure sensor is provided. When the sand delivery amount is too large, that is, when it exceeds the water carrying capacity, the pressure in the water supply pipe increases. The pressure sensor converts the detected pressure signal into an electrical signal and transmits it to the frequency conversion voltage regulator. The frequency conversion voltage regulator controls the motor to reduce the water output of the first water pump to reduce the pressure in the water supply pipe until it returns to the original value. Due to the reduction of the water output of the water supply pipe, the pressure in the nozzle increases, and the suction force on the sand grains decreases due to the reduction of the pressure difference, reducing the sand grains sucked into the mixer. Through the comprehensive action of each system, the phenomenon of sand blockage during the erosion process of the device is avoided.

[0015] In the present invention, a workbench is provided, which can displace the test bench in the X, Y, and Z axis directions to facilitate adjusting the erosion position of the specimen. The base in the test bench is slidably connected to the fuselage through an arc surface, which can adjust the erosion angle of the specimen and can simulate the on-site working conditions, improving the accuracy of the erosion wear test results. Brief Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of an embodiment of the present invention; Figure 2 is Figure 1 a partial enlarged view of part A in Figure 3 is Figure 1 a partial enlarged view of part B in Figure 4 is Figure 1 a front view full sectional view of the mixer in Figure 5 is Figure 1 a front view of the test bench in Figure 6 is Figure 5 a top view of Figure 7 is Figure 1 a front view full sectional view of the second water tank part in Figure 8 is Figure 1 a top view of the second water tank part in Figure 9 is Figure 1Schematic diagram of the structure of the second support plate part; Figure 10 is Figure 1 Front view of the workbench in; Figure 11 is Figure 1 Top view schematic of the third water tank part in; Figure 12 is Figure 1 Right view of the third water tank in; Figure 13 Flow chart of the embodiment of the present invention; Wherein: 1. First water tank, 2. Water supply pipe, 3. First water pump, 4. Electric motor, 5. Frequency conversion voltage regulator, 6. Pressure sensor, 7. Flow meter, 8. Mixer, 9. Turntable box, 10. Turntable, 11. Driving motor, 12. Air flow channel, 13. Sand feeding groove, 14. Sand tank, 15. Sand discharging pipe, 16. Sealing ring, 17. Vent pipe, 18. Air compressor, 19. Air pipe, 20. Sand particle controller, 21. Air inlet, 22. Sand outlet, 23. Sand supply pipe, 24. Spray pipe, 25. Test bench, 26. Base, 27. Machine body, 28. Gasket, 29. Bolt, 30. First clamping part, 31. Nut base, 32. Screw rod, 33. Handle, 34. Second clamping part, 35. Specimen, 36. Box body, 37. Workbench, 38. First support plate, 39. Second support plate, 40. X-shaped connecting rod, 41. Limit sliding table, 42. Lifting sliding table, 43. Z-axis knob, 44. Third support plate, 45. Limit assembly, 46. Y-direction moving mechanism, 47. Fourth support plate, 48. Support plate, 49. X-axis screw rod, 50. X-axis base, 51. Guide shaft, 52. X-axis knob, 53. Second water tank, 54. Enclosure groove, 55. Enclosure, 56. Cover plate, 57. Hose, 58. Third water tank, 59. First baffle, 60. Second baffle, 61. Welding point, 62. Circulation pipe, 63. Second water pump, 64. Valve, 65. Water storage cavity, 66. Buffer tank, 67. Y-axis knob. Specific embodiments

[0017] Taking Figure 1 to define the up, down, left, right, front and back directions of this embodiment.

[0018] As shown in the figure, this embodiment includes a test bench 25 with a test area, as well as a water supply system and a sand supply system for the test area. Among them, the water supply mechanism includes a first water tank 1. A water supply pipe 2 communicating with its inner cavity is provided at the lower right bottom of the first water tank 1, and the first water tank 1 is the water source of the water supply pipe 2. A first water pump 3 is provided on the water supply pipe 2. A motor 4 is fixedly installed at the upper end of the first water pump 3. During use, by controlling the motor 4 to drive the first water pump 3, the water in the first water tank 1 is pumped into the water supply pipe 2. The upper end of the motor 4 is electrically connected to a frequency conversion voltage regulator 5. By adjusting the input voltage of the motor 4 through the frequency conversion voltage regulator 5, the flow rate of the first water pump 3 can be adjusted. In the present invention, the frequency conversion voltage regulator 5 adopts the existing technology and will not be elaborated here. A pressure sensor 6 is provided on the right side of the first water pump 3. The pressure sensor 6 is installed on the water supply pipe 2 by screwing. Its lower end is the sensing part. After being fixed by screwing, the sensing part is located in the water supply pipe 2 and can detect the pressure change in the water supply pipe 2. The upper end of the pressure sensor 6 is connected to the frequency conversion voltage regulator 5 through a wire and can convert the detected pressure signal into an electrical signal and transmit it to the frequency conversion voltage regulator 5. A flow meter 7 is provided on the right side of the pressure sensor 6. The flow meter 7 is fixedly installed on the water supply pipe 2 and can detect the water flow rate in the water supply pipe 2, facilitating the operator to observe and record.

[0019] The sand supply mechanism includes a turntable box 9. A turntable 10 is arranged in the turntable box 9. There are gaps between the upper and lower plates and the left and right side surfaces of the turntable box 9 and the turntable 10, thus forming an air flow channel 12. A driving motor 11 is fixedly installed at the lower end of the turntable box 9. The rotating shaft of the driving motor 11 penetrates through the lower plate of the turntable box 9 and is fixedly connected to the central position of the turntable 10. During use, the rotation of the turntable 10 can be controlled by the driving motor 11. A sand delivery groove 13 is formed on the upper surface of the turntable 10. The sand delivery groove 13 is annular. Above the right part of the turntable box 9, there is a sand tank 14. Its lower end is fixedly connected to the upper plate of the turntable box 9 by bolts. A sealing ring 16 is arranged between the sand tank 14 and the turntable box 9, which can prevent the air flow channel 12 from communicating with the outside. A sand discharge pipe 15 is arranged at the lower end of the sand tank 14. The sand discharge pipe 15 passes through the turntable box 9 downward. The pipe orifice corresponds to the position of the sand delivery groove 13, and the end face of the pipe orifice is slidably connected to the upper surface of the turntable 10. When the turntable 10 rotates, the sand tank 14 can continuously deliver sand grains into the sand delivery groove 13 through the sand discharge pipe 15. In this embodiment, the outer diameter of the sand discharge pipe 15 is larger than the width of the sand delivery groove 13, and sand grains can be prevented from spilling outside the sand delivery groove 13 during the sand discharge process. A ventilation pipe 17 is arranged on the left side of the sand discharge pipe 15. The ventilation pipe 17 is fixedly connected to the sand tank 14. The lower end of the ventilation pipe 17 passes through the turntable box 9 and extends into the air flow channel 12, which can connect the inner cavity of the sand tank 14 with the air flow channel 12, so that the air pressure in the inner cavity of the sand tank 14 is the same as the air pressure in the air flow channel 12, and the sand grains in the sand tank 14 can fall smoothly. An air inlet 21 is arranged at the left part of the lower plate of the turntable box 9. An air pipe 19 is arranged in the air inlet 21. The outlet end of the air pipe 19 is fixedly connected to the lower plate of the turntable box 9 by bolts, and a sealing ring is arranged at the connection position to prevent the air flow channel 12 from communicating with the outside. The inlet end of the air pipe 19 is communicated with an air compressor 18. During use, compressed gas can be delivered into the air flow channel 12 through the air pipe 19. A sand grain controller 20 is arranged on the left side of the air compressor 18. The sand grain controller 20 is installed on the air pipe 19, which can control the switch of the air pipe 19, and the sand grain controller 20 is electrically connected to the driving motor 11. During use, when the sand grain controller 20 is started, the air pipe 19 can be controlled to open, and at the same time, the driving motor 11 can be controlled to start, so that the turntable 10 rotates. In this embodiment, the rotation speed of the rotating shaft of the driving motor 11 can be adjusted by controlling the input voltage of the sand grain sensor 20. An outlet sand port 22 is arranged at the left part of the upper plate of the turntable box 9. The outlet sand port 22 corresponds to the position of the sand delivery groove 13. A sand supply pipe 23 is arranged in the outlet sand port 22. The sand supply pipe 23 is fixedly connected to the upper plate of the turntable box 9 by bolts, and a sealing ring is arranged at the connection position to prevent the air flow channel 12 from communicating with the outside. The inlet end of the sand supply pipe 23 leads into the turntable box 9, and its position is above the sand delivery groove 13 in the working position. There is a spacing between the pipe orifice of the sand supply pipe 23 and the plane where the upper surface of the turntable 10 is located, and the opening area of the pipe orifice is smaller than the transverse area of the sand delivery groove 13.The distance between the lower end opening of the sand supply pipe 23 and the plane of the upper surface of the turntable 10 is less than the distance between the upper surface of the turntable 10 and the lower surface of the upper plate of the turntable box 9; during use, the compressed gas input by the air pipe 19 fills the air flow channel 12 and then is transported into the sand supply pipe 23. During the transportation of the compressed gas, an air flow with suction is formed at the inlet end of the sand supply pipe 23, sucking the sand grains in the sand delivery groove 13 into the sand supply pipe 23, and driving the sand grains to move along the sand supply pipe 23 by the kinetic energy of the air flow.

[0020] A mixer 8 is arranged between the water supply system and the sand supply system. A water storage cavity 65 is formed in the mixer 8, and the lower part of the water storage cavity 65 is conical; a spray pipe 24 is arranged at the lower bottom of the water storage cavity 65, and the inner diameter of the spray pipe 24 is smaller than that of the water storage cavity 65 and is communicated with the water storage cavity 65. The upper part of the mixer 8 is communicated with the outlet end of the water supply pipe 2, and water flow can be transported into the mixer 8 through the water supply pipe 2; the sand supply pipe 23 is communicated with the spray pipe 24, and the connection part is located in the middle of the spray pipe 24, and the included angle between the sand supply pipe 23 and the spray pipe 24 is an acute angle. In this embodiment, the mixer 8 adopts the technology of the Venturi principle. When the water flow flows from the conical structure at the lower part of the water storage cavity 65 into the spray pipe 24, the flow velocity of the water flow will increase, the pressure in the spray pipe 24 will decrease, a pressure difference is formed between the water storage cavity 65 and the spray pipe 24, sucking the sand grains transported by the sand supply pipe 23 into the spray pipe 24 to be mixed with the water flow and sprayed downward.

[0021] In this embodiment, the sand grains can be evenly transported to the lower part of the sand supply pipe 23 through the sand delivery groove 13, and the compressed gas transported by the air compressor 18 is used to suck the sand grains into the sand supply pipe 23, which can avoid the phenomenon that the mixer 8 is blocked due to uneven sand grain transportation. A buffer tank 66 is arranged in the middle of the sand supply pipe 23. The buffer tank 66 is a hopper-shaped tank body, and its internal cavity is communicated with the sand supply pipe 23. When the sand delivery amount is too large, that is, the sand grains exceed the water flow carrying capacity, the pressure in the water supply pipe 2 increases. The pressure sensor 6 converts the detected pressure signal into an electrical signal and transmits it to the frequency conversion voltage regulator 5. The frequency conversion voltage regulator 5 controls the motor 4 to reduce the water output of the first water pump 3 to reduce the pressure in the water supply pipe 2 until it returns to the original value; due to the reduction of the water output of the water supply pipe 2, the pressure in the spray pipe 24 increases, the suction force on the sand grains decreases due to the reduction of the pressure difference, and the sand grains sucked into the mixer 8 are reduced. The excess sand grains will stay in the buffer tank 66 for temporary storage.

[0022] There is a test bench 25 provided below the mixer 8. The test bench 25 includes a base 26. The upper surface of the base 26 is an arc surface. Conical protrusions are symmetrically arranged at the front and rear ends of the arc surface structure, and the upper surface of the protruding part is an arc surface. Above the base 26 is a fuselage 27. The lower surface of the fuselage 27 is an arc surface, which matches the upper surface of the base 26 and can slide left and right along the arc surface structure of the upper surface of the base 26. Support structures protruding from the center are provided on the front and rear sides of the fuselage 27, and the upper surfaces of the protruding parts are arc surfaces. Gaskets 28 are respectively provided above the protruding parts on the front and rear sides of the fuselage 27. In this embodiment, two symmetric gaskets 28 are provided. The lower surfaces of the two gaskets 28 are arc surfaces, which match the upper surfaces of the protruding parts of the fuselage 27 and the upper surfaces of the protruding parts of the base 26. One end of the two gaskets is located above the protruding part of the fuselage 27, and the other end is fixedly installed on the upper surface of the protruding part of the base 26 through bolts 29, which can press and fix the fuselage 27. A first clamping part 30 is provided at the upper end of the fuselage 27. The upper end of the first clamping part 30 protrudes from the upper surface of the fuselage 27, and an adjusting structure is provided on its right side. The adjusting mechanism includes a nut base 31. The nut base 31 is fixedly installed at the upper right part of the fuselage 27. A screw rod 32 is rotatably connected to the center of it. A second clamping part 34 slidably connected to the fuselage 27 is arranged on the outer periphery of the screw rod 32. The left end of the screw rod 32 is rotatably connected to the inner wall of the second clamping part 34 through a bearing, and its right end passes through the second clamping part 34 and is fixedly installed with a handle 33. When in use, rotating the handle 33 can control the left and right movement of the second clamping part 34. A specimen 35 is arranged between the first and second clamping parts and is fixed by the two clamping parts. In this embodiment, scales are provided on the protruding part on the front side of the fuselage 27, which is convenient for the operator to adjust the inclination angle of the specimen 35 on the fuselage 27 to simulate the working conditions on site.

[0023] The base 26 is fixedly installed on the workbench 37, and the workbench 37 is arranged in the box body 36. There is a gap between the workbench 37 and the inner wall of the box body 36. A second water tank 53 is formed between the workbench 37 and the bottom of the box body 36, which is used to collect the water-sand mixture spilled during the erosion test of the upper mixer 8. The workbench 37 includes a first support plate 38. The left and right ends of the first support plate 38 are fixedly connected to the inner wall of the box body 36, and there are gaps between its front and rear sides and the inner wall of the box body 36. The water-sand mixture spilled by the mixer 8 can flow into the second water tank 53 through the gaps. A second support plate 39 is arranged above the first support plate 38, and a lifting mechanism is arranged between the first support plate 38 and the second support plate 39. The lifting mechanism includes an X-shaped connecting rod 40. The X-shaped connecting rod 40 is composed of two hinged rods rotatably connected at the center. In this embodiment, two X-shaped connecting rods 40 are provided, and the two X-shaped connecting rods 40 are symmetrically arranged front and rear; the lower parts of the left ends of the two X-shaped connecting rods 40 are hinged to the lugs on the upper surface of the first support plate 38, and the upper parts of the left ends are hinged to the lugs on the lower surface of the second support plate 39. In this embodiment, setting lugs on the support plate and hinging them to the hinged rods is prior art and will not be elaborated here. The upper parts of the right ends of the two X-shaped connecting rods 40 are hinged to the slider of the lifting slide 42, and the lifting slide 42 is fixedly connected to the lower surface of the second support plate 39. The slider is screwed to the screw in the middle of the lifting slide 42, and a Z-axis knob 43 is fixedly connected to the right side of the screw, which can control the left and right movement of the slider. The lower parts of the right ends of the two X-shaped connecting rods 40 are hinged to the slider of the limit slide 41, and the limit slide 41 is fixedly connected to the upper surface of the first support plate 38. The slider is slidably connected to the shaft in the middle of the limit slide 41, which can make the lower parts of the right ends of the two X-shaped connecting rods 40 slide left and right along the limit slide 41. During use, rotate the Z-axis knob 43 to control the upper parts of the right ends of the two X-shaped connecting rods 40 to move leftward, which can make the second support plate 39 move upward. A third support plate 44 is arranged above the second support plate 39, and a Y-direction moving mechanism 46 for the third support plate 44 is arranged between the second support plate 39 and the third support plate 44. A Y-axis knob 47 is arranged at the front end of the Y-direction moving mechanism 46. During use, rotate the Y-axis knob 47 to control the front and rear movement of the third support plate 44. Limit components 45 are arranged on the left and right sides of the Y-direction moving mechanism 46. Here, the limit components 45 include a base fixedly installed on the upper surface of the second support plate 39 and a slider fixedly installed on the lower surface of the third support plate 44. The slider is slidably connected to the base. When the third support plate 44 moves back and forth, the limit components 45 can play a role in limiting.Above the third support plate 44, there is a fourth support plate 47. Between the third support plate 44 and the fourth support plate 47, there is an X-direction moving mechanism for the fourth support plate 47. The X-direction moving mechanism includes a support plate 48. In this embodiment, two support plates 48 are symmetrically arranged left and right along the center of the third support plate 44. The lower ends of the two support plates 48 are fixedly connected to the upper surface of the third support plate 44. Between the two support plates 48, there is an X-axis screw 49. The X-axis screw 49 is rotationally connected to the two support plates 48, and its right end passes through the support plate 48 and is equipped with an X-axis knob 52, which can control the rotation of the X-axis screw 49. Below the fourth support plate 47, there is an X-axis base 50. The upper end of the X-axis base 50 is fixedly connected to the lower surface of the fourth support plate 47, and the middle part of it is threadedly connected to the X-axis screw 49. When in use, by rotating the X-axis knob 52, the left and right movement of the fourth support plate 47 can be controlled. Above the X-axis screw 49, there is a guide shaft 51. The left and right ends of the guide shaft 51 are fixedly connected to the two support plates 48. The guide shaft 51 is slidably connected to the X-axis base 50 and the base installed on the lower surface of the fourth support plate 47. When the fourth support plate 47 moves left and right, the guide shaft 51 can play a guiding role. On both the front and rear sides of the X-direction moving mechanism, there are limit components 45, which can play a limiting role when the fourth support plate 47 moves back and forth. In this embodiment, the base 26 of the test bench 25 is fixedly installed at the upper end of the fourth support plate 47 and can move with the fourth support plate 47. When in use, by controlling the Z-axis knob 43, the Y-axis knob 67, and the X-axis knob 52, the position of the test bench 25 can be adjusted.

[0024] In this embodiment, the Y-direction moving mechanism 46 has the same structure as the X-direction moving mechanism, and the two moving mechanisms are arranged perpendicular to each other.

[0025] On the upper plate surface of the box body 36, there is a notch. The size of the notch is larger than that of the workbench 37, which can avoid hindering the movement of each support plate in the workbench 37. On the upper surface of the box body 36, there is a retaining groove 54, and a retaining fence 55 is placed in the retaining groove 54. In this embodiment, the retaining fence 55 is in a right-angled shape and there are two of them. Its right-angled design can ensure the stability after the retaining fence 55 is installed. Above the retaining fence 55, there is a cover plate 56. In this embodiment, there are two cover plates 56, and through holes are provided at the central positions of the two cover plates 56. The shape of the through holes matches the shape of the mixer 8. When in use, first insert the two retaining fences 55 into the retaining groove 54, and then place the two cover plates 56 on the upper ends of the retaining fences 55. The test bench 25 and the lower part of the mixer 8 are covered by the retaining fences 55 and the cover plates 56 to form a test area. The discharge port of the mixer 8 is located inside the retaining fence. During the erosion test process, it can prevent the water-sand mixture sprayed by the mixer 8 from scattering to the outside.

[0026] A third water tank 58 is provided on the left side of the box body 36. The lower bottom of the second water tank 53 is communicated with the lower part of the third water tank 58 through a pipeline. In this embodiment, five hoses 57 are provided to communicate the second water tank 53 with the third water tank 58, and a steel wire thread structure is wrapped inside each hose; using five hoses 57 can slow down the flow rate of the water from the second water tank 53 to the third water tank 58, enabling the sand grains in the second water tank 53 to precipitate by their own weight, reducing the sand grains entering the third water tank 58, and intercepting the sand grains through the steel wire thread structure. A second baffle 60 is provided in the third water tank 58, and the second baffle 60 divides the inner cavity of the third water tank 58 into a front cavity and a rear cavity; a vertical first baffle 59 is provided in the front cavity of the third water tank 58, and the first baffle 59 divides the front cavity into a left cavity and a right cavity. In this embodiment, the upper surface of the second baffle 60 is located at one-third of the inner cavity of the third water tank 58, and the height of the first baffle 59 is lower than that of the second baffle 60, with a difference of 20 mm - 30 mm. The peripheries of the first baffle 59 and the second baffle 60 are fixedly connected to the inner wall of the third water tank 58 and the side surface of the second baffle 60 through spaced welding points 61, thereby forming a flow gap around the first baffle 59 and the second baffle 60. The inlet of the third water tank 58 is located at the lower right end of the right cavity, and the outlet is located at the lower left end of the rear cavity; the inlet of the third water tank 58 is connected to the first water tank 1 through a circulation pipe 62 connecting a second water pump 63. During use, the water in the third water tank 58 is transported to the first water tank 1 through the circulation pipe 62 by the second water pump 63, realizing the recycling of water, and the sand grains carried by the water flow will be filtered out by the obstruction of each hose 57 and the flow gaps around the first and second baffles; the second baffle 60 is higher than the first baffle 59, and some of the sand grains carried by the water flow that cross the first baffle 59 will be intercepted by the second baffle 60. A valve 64 is provided on the circulation pipe 62 between the second water pump 63 and the third water tank 58. When the second water pump 63 is being repaired, closing the valve 64 can prevent the water in the third water tank 58 from flowing out.

[0027] In the use of this embodiment, first place the specimen 35 between the first clamping part 30 and the second clamping part 34, and rotate the handle 33 to move the second clamping part 34 to the left to clamp and fix the specimen 35. After clamping the specimen, loosen the bolt 29, rotate the fuselage 27, and adjust the placement angle of the specimen 35 according to the on-site working conditions. After completion, tighten the bolt 29 and press the fuselage 27 through the gasket 28. Then rotate the Z-axis knob 43, Y-axis knob 67, and X-axis knob 52 respectively to adjust the position of the specimen 35 so that the eroded part of the specimen 35 is aligned with the nozzle 24 of the mixer 8. After the position adjustment is completed, insert the enclosure 55 into the enclosure groove 54 and place the cover plate 56 above the enclosure 55. Start the variable frequency voltage regulator 5 to control the motor 4 to drive the first water pump 3 to pump water into the water supply pipe 2; at the same time, start the sand grain controller 20. The sand grain controller 20 opens the air pipe 19 and starts the drive motor 11. The turntable 10 starts to rotate, and the sand grains are conveyed through the sand feeding groove 13. The sand grains conveyed to the sand outlet 22 will be sucked into the sand supply pipe 23 by the action of the compressed gas conveyed through the air pipe 19. The water flow and sand grains are conveyed to the mixer 8 through the water supply pipe 2 and the sand supply pipe 23, are mixed in the mixer 8 and ejected from the nozzle 24 to conduct an erosion test on the specimen 35. During the test, start the second water pump 63 and the valve 64 to convey the water collected in the third water tank 58 to the first water tank 1 through the circulation pipe 62. A small amount of sand grains carried by the water flow in the second water tank 53 enter the third water tank 58 through each hose 57. Most of the sand grains are intercepted by the wire thread structure in each hose 57, and the remaining sand grains are filtered out by the flow gaps around the first and second baffles.

[0028] When the sand feeding amount of the sand supply system is excessive, that is, when the sand grains exceed the water flow carrying capacity, the pressure in the water supply pipe 2 rises. The pressure sensor 6 converts the detected pressure signal into an electrical signal and transmits it to the variable frequency voltage regulator 5. The variable frequency voltage regulator 5 controls the motor 4 to reduce the water output of the first water pump 3 to reduce the pressure in the water supply pipe 2 until it returns to the original value; due to the reduction of the water output of the water supply pipe 2, the pressure in the nozzle 24 rises, and the suction force on the sand grains decreases due to the reduction of the pressure difference, reducing the sand grains sucked into the mixer 8. The excess sand grains will stay in the buffer tank 66 for temporary storage until the sand grains in the sand tank 14 are exhausted, and finally the sand grains temporarily stored in the buffer tank 66 are conveyed to the mixer 8.

Claims

1. A jet erosion wear tester, comprising a test bench with a test area, and a water supply system and a sand supply system for the test area, wherein the water supply system comprises a water supply pipe, and is characterized by: The sand supply system comprises a sand tank, a turntable with an annular sand delivery groove on the upper surface is arranged below the sand discharge pipe of the sand tank, the pipe opening of the sand discharge pipe corresponds to the position of the sand delivery groove and the end surface of the pipe opening is slidably connected to the upper surface of the turntable; the turntable is connected to the driving motor; The turntable is located in the turntable box, and a sand outlet is arranged on the upper plate of the turntable box. The pipe opening of the sand outlet corresponds to the position of the sand feeding trough and a distance is left between the pipe opening and the plane where the upper surface of the turntable is located; an air inlet connected to an air compressor is also arranged on the turntable box; a water supply pipe and a sand supply pipe connected to the sand outlet on the turntable box are both connected to the mixer, and a material outlet of the mixer is connected to the test area.

2. The jet erosion wear testing machine according to claim 1, characterized in that: There is a gap between the lower plate surface, upper plate surface and side surface of the turntable box and the turntable, thereby forming an air flow channel; the inlet end of the sand supply pipe leads into the turntable box, and its position is above the sand delivery trough of the working position, and its opening area is smaller than the transverse area of ​​the sand delivery trough, and the distance between the lower port of the sand supply pipe and the plane where the upper surface of the turntable is located is smaller than the distance between the upper surface of the turntable and the lower surface of the upper plate of the turntable box.

3. The jet erosion wear testing machine according to claim 1 or 2, characterized in that: A buffer tank is arranged in the middle of the sand pipe, and the buffer tank is a bucket-shaped tank body.

4. The jet erosion wear testing machine according to claim 1 or 2, characterized in that: The test bench is provided with a workbench, which is arranged in a box body, with a gap between the workbench and the box body wall, and a second water tank is formed between the workbench and the lower bottom of the box body. The lower bottom of the second water tank is connected with the lower part of the third water tank through a pipeline, and the lower part of the third water tank is connected with the first water tank through a circulation pipe connected to the second water pump; a water supply pipe connected to the first water pump is arranged at the lower bottom of the first water tank, and the first water tank is the water source of the water supply pipe.

5. The jet erosion wear testing machine according to claim 4, characterized in that: The test bench includes a base fixed on the workbench, the upper surface of the base is an arc surface, the fuselage is provided with an arc-shaped part whose lower surface cooperates with the upper surface of the base, and the upper end of the arc-shaped part is provided with a first clamping part; gaskets are respectively provided above both sides of the arc-shaped part of the fuselage, one end of each gasket is located above the arc-shaped part of the fuselage, and the other end is fixedly connected to the base by a bolt; the fuselage is also provided with an adjustment mechanism, the adjustment mechanism includes a nut base arranged on the fuselage, a screw rod passes through the nut base, one end of the screw rod is connected to the handle, and the other end is connected to the second clamping part corresponding to the first clamping part.

6. The jet erosion wear testing machine according to claim 4, characterized in that: A fence covering the test bench is arranged above the box body, the lower part of the mixer passes through the upper plate surface of the fence, and the discharge port thereof is located in the fence.

7. The jet erosion wear tester according to claim 4, characterized in that: The workbench includes, from bottom to top, a first support plate, a second support plate, a third support plate and a fourth support plate, a lifting mechanism is arranged between the first support plate and the second support plate, a Y-direction moving mechanism of the third support plate is arranged between the second support plate and the third support plate, an X-direction moving mechanism of the fourth support plate is arranged between the third support plate and the fourth support plate, and the X-direction moving mechanism and the Y-direction moving mechanism are perpendicular to each other.

8. The jet erosion wear testing machine according to claim 4, characterized in that: The third water tank is provided with a second baffle which divides its inner cavity into a front cavity and a rear cavity. The front cavity is divided into left and right cavities by a vertical first baffle. The inlet of the third water tank is located at the lower part of the right cavity, and the outlet is located at the lower part of the rear cavity. The peripheries of the first baffle and the second baffle are fixedly connected to the inner wall of the third water tank through mutually spaced welding points, thereby forming a flow gap at the peripheries of the first baffle and the second baffle.

9. The jet erosion wear tester according to claim 1 or 2, characterized in that: The mixer comprises a water storage chamber and a nozzle at the bottom of the water storage chamber. The sand supply pipe passes through the middle of the nozzle and forms an acute angle with the nozzle.

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