A threaded cartridge hydraulic valve test bench

Abstract

The present invention relates to the technical field of valve production, specifically a threaded plug-in hydraulic valve test bench, including an aluminum profile main frame, a test table is arranged on the aluminum profile main frame, a base is arranged below the test table, a hydraulic oil supply system is arranged inside the base, and the hydraulic oil supply system includes an oil tank, the oil tank is connected to a cooling pump, a high-pressure flowmeter, a functional module, a circulating pump group, and a filtering mechanism is arranged between the high-pressure flowmeter and the circulating pump group. The threaded plug-in hydraulic valve test bench proposed by the present invention has a compact structure and an oil source using a servo pump group with low noise and low vibration; the test is modularly designed, and the hydraulic products with different functions and test requirements can be tested by replacing different oil circuit designs to meet the test requirements; the open data acquisition port can provide more accurate test solutions according to different test requirements.

Description

Technical Field

[0001] The invention relates to the technical field of valve production, in particular to a threaded plug-in hydraulic valve test bench. Background Art

[0002] A hydraulic valve is an automatic component operated by pressure oil. It is controlled by the pressure oil of the pressure distribution valve. It is usually used in combination with an electromagnetic pressure distribution valve. It can be used to remotely control the on and off of the oil, gas, and water pipeline systems of a hydropower station. It is often used for clamping, controlling, lubricating, and other oil circuits. There are direct-acting and pilot types. The pilot type is mostly used. According to the control method, it can be divided into manual, electric control, and hydraulic control to achieve the purpose of easy operation. The cartridge hydraulic valve is different from the ordinary hydraulic control valve. Its flow rate can reach 1000L / min, and the diameter can reach 200-250mm. Its valve core structure is simple, the action is sensitive, and the sealing is good. Its function is relatively simple, mainly to realize the on or off of the liquid circuit. When used in combination with an ordinary hydraulic control valve, it can realize the control of the direction, pressure, and flow of the system oil. With the application and promotion of threaded cartridge hydraulic valves, the requirements for the performance stability of cartridge valves have also increased. In order to control the various performances of threaded cartridge valves in a targeted manner, it is necessary to test the produced cartridge hydraulic valves. Summary of the invention

[0003] The object of the present invention is to provide a threaded cartridge hydraulic valve test bench to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a threaded plug-in hydraulic valve test bench, comprising an aluminum profile main frame, a test table surface is arranged on the aluminum profile main frame, a base is arranged below the test table surface, a hydraulic oil supply system is arranged inside the base, and the hydraulic oil supply system includes an oil tank, the oil tank is connected to a cooling pump, a high-pressure flow meter, a functional module, and a circulating pump group, and a filtering mechanism is arranged between the high-pressure flow meter and the circulating pump group.

[0005] Preferably, a human-machine interaction panel is arranged above the test table, an indicator meter is arranged beside the human-machine interaction panel, and an adjustment operation panel is arranged on the front side of the test table.

[0006] Preferably, the filtering mechanism includes a top shell body, the two ends of the top shell body are respectively connected to an inlet pipe and an outlet pipe, the bottom of the top shell body is connected to an outer shell body, an inner filter cartridge is arranged inside the outer shell body, the bottom end opening of the inlet pipe is located between the outer shell body and the inner filter cartridge, the bottom end of the outlet pipe is inserted into the top of the inner filter cartridge, a plurality of filter grooves are opened on the side wall of the inner filter cartridge, the middle and upper sections inside the filter grooves are filter screens, and a cleaning assembly is arranged on the outside of the inner filter cartridge.

[0007] Preferably, the cleaning assembly includes a lifting ring, a plurality of convex plates are arranged on the side wall of the lifting ring, a threaded barrel is arranged on the convex plate, a lifting motor is installed at the bottom of the outer shell, a screw rod is connected to the output end of the lifting motor, the screw rod passes through the convex plate and is connected with the threaded barrel, a plurality of installation grooves are opened at the bottom of the lifting ring, and a cleaning mechanism which is easy to disassemble and assemble is arranged in the installation groove.

[0008] Preferably, two limit sliders are arranged on the side wall of the lifting ring, and the limit sliders are slidably embedded in the sliding grooves of the inner side wall of the outer shell.

[0009] Preferably, the cleaning mechanism includes a mounting block, a bearing sleeve is installed in the mounting block, a cleaning column is inserted and installed in the inner ring of the bearing sleeve, a cleaning head is provided at one end of the cleaning column, the cleaning head is embedded in the filter tank and fits on the filter net, a friction wheel is provided at the other end of the cleaning column, a plurality of friction strips are provided on the inner wall of the outer shell, the friction strips and the friction wheels correspond one to one, positioning holes are provided on the top surfaces of the mounting block and the outer ring of the bearing sleeve, and an installation component for fixing the cleaning mechanism is provided in the lifting ring.

[0010] Preferably, the friction strip is provided with an inclined surface, the inclined surface is in close contact with the friction wheel, and the friction wheel and the inclined surface are both provided with convex ridges, which increase the friction force between the friction wheel and the inclined surface of the friction strip.

[0011] Preferably, the mounting assembly includes an inner ring, which is movably arranged in a cavity in the lifting ring, and a plurality of groups of positioning pins are arranged on the bottom surface of the lifting ring, and the positioning pins are correspondingly inserted in the positioning holes, and a plurality of compression springs are arranged on the upper surface of the inner ring, and two push rods are arranged on the inner ring, and two blocks are arranged on the inner side wall of the outer shell, and the blocks correspond to the push rods one by one, and the blocks are located below the push rods.

[0012] Preferably, a plurality of bottom windows are provided at the bottom of the outer shell, and the bottom windows are sealed by a sealing assembly, wherein the sealing assembly includes a bottom plate, the bottom plate is attached to the bottom surface of the outer shell, three sealing plates are connected to the bottom plate, pass through the bottom surface of the outer shell and are located in the bottom window to block the bottom window, a twisting block is rotatably installed in the middle of the bottom plate, the upper end of the twisting block is connected to a connecting part, a thread is provided on the side wall of the connecting part, a connecting sleeve is provided at the bottom of the outer shell, the connecting part is screwed in the connecting sleeve, a group of movable clamping columns are movably provided inside the top end of the connecting part, a tightening spring is connected between the opposite ends of the movable clamping columns, the other end of the movable clamping column is inserted into the clamping hole in the inner wall of the connecting sleeve, an inner cavity is provided in the twisting block and the connecting part, a pressing column is movably inserted at the bottom of the twisting block, the upper end of the pressing column is located in the inner cavity, two pulleys are installed on both sides of the pressing column, one end of the movable clamping column inserted in the connecting part is connected to a traction belt, and the traction belt passes around the pulley and is connected to the pressing column.

[0013] Preferably, sealing grooves are provided on the top and side walls of the bottom window, a sealing plate is embedded in the sealing groove, a sealing airbag is embedded in the edge of the sealing plate, an inner plate is provided inside the sealing plate, an air storage bag is connected to the bottom of the inner plate, the air storage bag and the sealing airbag are connected through an air pipe, two movable columns are provided on the top of the inner plate, the movable columns pass through the top surface of the sealing plate, and reset springs are provided on both sides of the movable columns.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The present invention proposes a threaded plug-in hydraulic valve test bench, which has a compact structure and an oil source using a servo pump group with low noise and low vibration; the test is modularly designed, and can test hydraulic products with different functions and test requirements by replacing different oil circuit designs to meet test requirements; the open data acquisition port can provide more accurate test solutions according to different test requirements.

[0016] 2. After the test bench has been working for a long time, the internal hydraulic oil may contain impurities, affecting the test results. Because a filtering mechanism is provided, the liquid in the hydraulic oil circuit inside the test bench can be filtered to keep the inside of the oil circuit clean. The hydraulic oil enters the interior of the outer shell from the inlet pipe and is filtered through the filter tank. The filter tank blocks the impurities contained in the hydraulic oil and the hydraulic oil is discharged from the outlet pipe, thereby ensuring the test effect.

[0017] 3. After the filter mechanism has been filtering for a long time, a large amount of impurities will accumulate on the surface of the filter tank, which may cause blockage. Since a cleaning component and a cleaning mechanism are provided, the filter tank is cleaned once every certain period of time during the operation of the equipment. During cleaning, the lifting motor is controlled to drive the screw rod to rotate, and then the convex plate drives the lifting ring to move up and down, and the mounting block moves up and down accordingly. Therefore, the friction wheel will roll on the friction strip, so that the friction wheel drives the cleaning column and the cleaning head to rotate, and the cleaning head can clean the filter tank to prevent impurities from clogging the filter tank.

[0018] 4. After the equipment has been working for a long time, it is necessary to clean the impurities inside the outer shell or replace the cleaning head. At this time, you need to disassemble the sealing assembly first, and clean the impurities inside the outer shell from the bottom window. Then, start the lifting motor to make the lifting ring drop to the bottom. The top rod is blocked by the block so that the inner ring moves upward relatively, and the positioning column is moved out of the positioning hole. The bearing sleeve, cleaning column, cleaning head and friction wheel can be pulled out from the bottom window and then the parts can be replaced. After aligning and plugging according to the original installation method, control the lifting motor to reverse to make the lifting ring rise, and then the compression spring rebounds to press the inner ring down, and the positioning column is inserted into the positioning hole to complete the replacement, and then install the sealing assembly.

[0019] 5. Due to the provision of a sealing assembly, the maintenance of the filtering mechanism is more convenient. Since the sealing plate is embedded in the sealing groove, the movable column is pressed down at this time, so that the inner plate compresses the air storage bag, and the gas in the air storage bag enters the sealing air bag. The sealing air bag expands to block the gap at the connection in the sealing groove, which greatly improves the sealing performance. During installation, press the pressing column, and the traction belt will pull the movable clamping column to shrink toward the middle. After the connecting part is screwed into the connecting sleeve, the movable clamping column is pushed by the tightening spring and inserted into the clamping hole. The installation is simple and can prevent the connection from loosening due to vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the appearance structure of the present invention.

[0021] Figure 2 It is a schematic diagram of the internal structure of the present invention.

[0022] Figure 3 This is the hydraulic principle diagram of the test bench of the present invention.

[0023] Figure 4 It is the structural diagram of the filtering mechanism of the present invention.

[0024] Figure 5 This is a diagram showing the internal structure of the filtering mechanism of the present invention.

[0025] Figure 6 This is a structural diagram of the lifting ring of the present invention.

[0026] Figure 7 This is a structural diagram of the installation components of the present invention.

[0027] Figure 8 It is the structural diagram of the cleaning mechanism of the present invention.

[0028] Fig. 9 This is another perspective view of the cleaning mechanism of the present invention.

[0029] Fig.10 It is the connection diagram of the cleaning mechanism of the present invention.

[0030] Fig.11 This is a structural diagram of the outlet pipe connection of the present invention.

[0031] Fig.12 This is a structural diagram of the inner filter cartridge connection of the present invention.

[0032] Fig.13 This is a structural diagram of the sealing component of the present invention.

[0033] Fig.14 This is a diagram of the air storage bag connection structure of the present invention.

[0034] Fig.15 This is a structural diagram of the connection between the connection part and the connection sleeve of the present invention.

[0035] In the figure: aluminum profile main frame 1, test table 2, human-machine interaction panel 201, indicator 202, adjustment operation panel 203, base 3, cooling pump 4, oil tank 5, high-pressure flow meter 6, functional module 7, circulation pump group 8, filter mechanism 9, top shell 10, inlet pipe 11, outlet pipe 12, outer shell 13, inner filter cartridge 14, filter tank 15, lifting ring 16, limit slider 1601, convex plate 17, lifting motor 18, screw rod 19, mounting block 20, bearing Sleeve 21, cleaning column 22, cleaning head 23, friction wheel 24, positioning hole 25, friction strip 26, inner ring 27, positioning column 28, clamping spring 29, push rod 30, bottom window 31, bottom plate 32, sealing plate 33, sealing airbag 34, movable column 35, inner plate 36, return spring 37, air storage bag 38, torsion block 39, connecting part 40, connecting sleeve 41, movable clamping column 42, clamping spring 43, inner cavity 44, pressing column 45, pulley 46, traction belt 47. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] See also Figures 1 to 15 The present invention provides a technical solution: a threaded plug-in hydraulic valve test bench, comprising an aluminum profile main frame 1, a test bench 2 is arranged on the aluminum profile main frame 1, a human-machine interaction panel 201 is arranged above the test bench 2, an indicator 202 is arranged next to the human-machine interaction panel 201, and an adjustment operation panel 203 is arranged on the front side of the test bench 2. A base 3 is arranged below the test bench 2, and a hydraulic oil supply system is arranged inside the base 3. The hydraulic principle is as follows Figure 3 As shown, the hydraulic oil supply system includes an oil tank 5, which is connected to a cooling pump 4, a high-pressure flow meter 6, a functional module 7, and a circulating pump group 8. A filtering mechanism 9 is provided between the high-pressure flow meter 6 and the circulating pump group 8.

[0038] The filtering mechanism 9 includes a top shell body 10, and the two ends of the top shell body 10 are respectively connected with an inlet pipe 11 and an outlet pipe 12, and the bottom of the top shell body 10 is connected with an outer shell body 13, and an inner filter cartridge 14 is arranged inside the outer shell body 13, and the bottom end opening of the inlet pipe 11 is located between the outer shell body 13 and the inner filter cartridge 14, and the bottom end of the outlet pipe 12 is inserted into the top of the inner filter cartridge 14, and a plurality of filter grooves 15 are opened on the side wall of the inner filter cartridge 14, and the middle and upper sections inside the filter grooves 15 are filter nets. When the test bench works for a long time, the hydraulic oil inside may contain impurities, which will affect the test effect. Because the filtering mechanism 9 is provided, the liquid in the hydraulic oil circuit inside the test bench can be filtered to keep the inside of the oil circuit clean. The hydraulic oil enters the inside of the outer shell body 13 from the inlet pipe 11, and is filtered by the filter groove 15. The filter groove 15 blocks the impurities contained in the hydraulic oil, and the hydraulic oil is discharged from the outlet pipe 12, thereby ensuring the test effect.

[0039] A cleaning assembly is arranged on the outside of the inner filter cartridge 14, and the cleaning assembly includes a lifting ring 16, and two limit sliders 1601 are arranged on the side wall of the lifting ring 16, and the limit sliders 1601 are slidably embedded in the slide grooves of the inner side wall of the outer shell 13. To enable it to move up and down stably, a plurality of convex plates 17 are arranged on the side wall of the lifting ring 16, and a threaded barrel is arranged on the convex plate 17. A lifting motor 18 is installed at the bottom of the outer shell 13, and a screw rod 19 is connected to the output end of the lifting motor 18, and the screw rod 19 passes through the convex plate 17 and is connected with the threaded barrel. The lifting ring 16 can be controlled to move up and down by starting the lifting motor 18. A plurality of mounting grooves are provided at the bottom of the lifting ring 16, and a cleaning mechanism for easy disassembly and assembly is arranged in the mounting groove. The cleaning mechanism includes a mounting block 20, a bearing sleeve 21 is installed in the mounting block 20, a cleaning column 22 is inserted and installed in the inner ring of the bearing sleeve 21, a cleaning head 23 is provided at one end of the cleaning column 22, the cleaning head 23 is embedded in the filter tank 15 and fits on the filter net, a friction wheel 24 is provided at the other end of the cleaning column 22, and a plurality of friction strips 26 are provided on the inner wall of the outer shell 13, and the friction strips 26 and the friction wheels 24 correspond to each other. A positioning hole 25 is provided on the surface, and a slope is provided on the friction strip 26. The slope is tightly attached to the friction wheel 24. Both the friction wheel 24 and the slope are provided with convex ridges. The convex ridges increase the friction between the friction wheel 24 and the slope of the friction strip 26. The friction wheel 24 and the friction strip 26 are similar to a gear and a rack. Because the friction between the two is large, because the friction wheel 24 is attached to the friction strip 26, when the friction wheel 24 is moved up and down, because the cleaning column 22 connected to the friction wheel 24 is rotatably installed, the friction wheel 24 will roll on the friction strip 26 and rotate with the cleaning column 22.

[0040] After the filter mechanism 9 has been filtering for a long time, a large amount of impurities will accumulate on the surface of the filter tank 15, which may cause blockage. Since a cleaning component and a cleaning mechanism are provided, the filter tank 15 is cleaned once every certain period of time during the operation of the equipment. During cleaning, the lifting motor 18 is controlled to start to drive the screw rod 19 to rotate, so that the convex plate 17 drives the lifting ring 16 to move up and down, and the mounting block 20 moves up and down accordingly. Therefore, the friction wheel 24 will roll on the friction strip 26, so that the friction wheel 24 drives the cleaning column 22 and the cleaning head 23 to rotate, and the cleaning head 23 can clean the filter tank 15, thereby preventing impurities from clogging the filter tank 15.

[0041] A mounting assembly for fixing the cleaning mechanism is provided in the lifting ring 16, and the mounting assembly includes an inner ring 27, and the inner ring 27 is movably arranged in the cavity in the lifting ring 16, and a plurality of groups of positioning pins 28 are provided on the bottom surface of the lifting ring 16, and the positioning pins 28 are correspondingly inserted in the positioning holes 25, and a plurality of compression springs 29 are provided on the upper surface of the inner ring 27, and two push rods 30 are provided on the inner ring 27, and two blocks are provided on the inner side wall of the outer shell 13, and the blocks and the push rods 30 correspond one to one, and the blocks are located below the push rods 30, and a plurality of bottom windows 31 are provided at the bottom of the outer shell 13, and the bottom windows 31 are sealed by the sealing assembly.

[0042] After the equipment has been working for a long time, it is necessary to clean the impurities inside the outer shell 13 or replace the cleaning head 23. At this time, the sealing assembly needs to be disassembled first, and the impurities inside the outer shell 13 can be cleaned from the bottom window 31. Then, the lifting motor 18 is controlled to start so that the lifting ring 16 drops to the bottom, and the top rod 30 is blocked by the block so that the inner ring 27 moves upward relatively. The positioning column 28 is moved out of the positioning hole 25, and the bearing sleeve 21, the cleaning column 22, the cleaning head 23 and the friction wheel 24 can be pulled out from the bottom window 31 and then the parts are replaced. After aligning and plugging according to the original installation method, the lifting motor 18 is controlled to reverse to make the lifting ring 16 rise, and then the compression spring 29 rebounds to press the inner ring 27 down, and the positioning column 28 is inserted into the positioning hole 25. The replacement is completed, and then the sealing assembly can be installed.

[0043] The sealing assembly includes a bottom plate 32, which is attached to the bottom surface of the outer shell 13. Three sealing plates 33 are connected to the bottom plate 32, passing through the bottom surface of the outer shell 13 and located in the bottom window 31 to block the bottom window 31. A twist block 39 is rotatably installed in the middle of the bottom plate 32. The upper end of the twist block 39 is connected to a connecting portion 40. The side wall of the connecting portion 40 is provided with a thread. A connecting sleeve 41 is provided at the bottom of the outer shell 13. The connecting portion 40 is screwed into the connecting sleeve 41. A set of movable A clamping column 42 and a tightening spring 43 are connected between the opposite ends of the movable clamping column 42, and the other end of the movable clamping column 42 is inserted into the clamping hole in the inner wall of the connecting sleeve 41. An inner cavity 44 is provided in the torsion block 39 and the connecting part 40. A pressing column 45 is movably inserted at the bottom of the torsion block 39, and the upper end of the pressing column 45 is located in the inner cavity 44. Two pulleys 46 are installed on both sides of the pressing column 45. One end of the movable clamping column 42 inserted in the connecting part 40 is connected to a traction belt 47, and the traction belt 47 passes around the pulley 46 and is connected to the pressing column 45. Sealing grooves are provided on the top and side walls, a sealing plate 33 is embedded in the sealing grooves, a sealing airbag 34 is embedded in the edge of the sealing plate 33, an inner plate 36 is provided inside the sealing plate 33, an air storage bag 38 is connected to the bottom of the inner plate 36, the air storage bag 38 and the sealing airbag 34 are connected through an air pipe, two movable columns 35 are provided on the top of the inner plate 36, the movable columns 35 pass through the top surface of the sealing plate 33, and reset springs 37 are provided on both sides of the movable columns 35.

[0044] Due to the provision of a sealing assembly, maintenance of the filter mechanism 9 is more convenient. Since the sealing plate 33 is embedded in the sealing groove, the movable column 35 is pressed down at this time, so that the inner plate 36 compresses the air storage bag 38, and the gas in the air storage bag 38 enters the sealing air bag 34. The sealing air bag 34 expands to block the gap at the connection in the sealing groove, greatly improving the sealing performance. During installation, press the pressing column 45, and the traction belt 47 will pull the movable clamping column 42 to shrink toward the middle. After the connecting part 40 is screwed into the connecting sleeve 41, the movable clamping column 42 is pushed by the tightening spring 43 to be inserted into the clamping hole. The installation is simple and can prevent the connection from loosening due to vibration.

[0045] The present invention proposes a threaded cartridge hydraulic valve test bench, which has a compact structure and an oil source adopting a servo pump group with low noise and low vibration; the test is modularly designed, and the test requirements can be met by replacing different oil circuit designs, so that hydraulic products with different functions and test requirements can be tested; the open data acquisition port can provide more accurate test solutions according to different test requirements.

[0046] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A threaded cartridge hydraulic valve test bench, comprising an aluminum profile main frame, characterized in that: A test table is arranged on the main frame of the aluminum profile, a base is arranged below the test table, a hydraulic oil supply system is arranged inside the base, the hydraulic oil supply system includes an oil tank, the oil tank is connected with a cooling pump, a high-pressure flow meter, a functional module, and a circulating pump group, a filtering mechanism is arranged between the high-pressure flow meter and the circulating pump group, the filtering mechanism includes a top shell body, both ends of the top shell body are respectively connected with an inlet pipe and an outlet pipe, an outer shell body is connected to the bottom of the top shell body, an inner filter cartridge is arranged inside the outer shell body, the bottom end opening of the inlet pipe is located between the outer shell body and the inner filter cartridge, the bottom end of the outlet pipe is inserted into the top of the inner filter cartridge, a plurality of filter grooves are arranged on the side wall of the inner filter cartridge, and the filter grooves The middle and upper section of the interior is a filter screen, and a cleaning assembly is arranged on the outer side of the inner filter cartridge. The cleaning assembly includes a lifting ring, and two limit sliders are arranged on the side wall of the lifting ring. The limit sliders are slidably embedded in the slide grooves of the inner side wall of the outer shell. A plurality of convex plates are arranged on the side wall of the lifting ring, and a threaded barrel is arranged on the convex plate. A lifting motor is installed at the bottom of the outer shell, and a screw rod is connected to the output end of the lifting motor. The screw rod passes through the convex plate and is connected with the threaded barrel. A plurality of mounting grooves are opened at the bottom of the lifting ring, and a cleaning mechanism that is easy to disassemble and assemble is arranged in the mounting groove. The cleaning mechanism includes a mounting block, and a bearing sleeve is installed in the mounting block. A cleaning column is inserted and installed in the inner ring of the bearing sleeve; A plurality of bottom windows are arranged at the bottom of the outer shell, and the bottom windows are sealed by a sealing assembly. The sealing assembly includes a bottom plate, which is attached to the bottom surface of the outer shell, and three sealing plates are connected to the bottom plate, which pass through the bottom surface of the outer shell and are located in the bottom window to seal the bottom window. A twist block is rotatably installed in the middle of the bottom plate, and a connecting part is connected to the upper end of the twist block, and a thread is provided on the side wall of the connecting part. A connecting sleeve is arranged at the bottom of the outer shell, and the connecting part is screwed in the connecting sleeve. A group of movable clamping columns are movably arranged inside the top end of the connecting part, and a tightening spring is connected between the opposite ends of the movable clamping columns, and the other end of the movable clamping column is inserted into the clamping hole in the inner wall of the connecting sleeve. An inner cavity is arranged in the twisting block and the connecting part, and a pressing column is movably inserted at the bottom of the twisting block, and the upper end of the pressing column is located in the inner cavity, and two pulleys are installed on both sides of the pressing column.

2. A threaded cartridge hydraulic valve test bench according to claim 1, characterized in that: A human-machine interaction panel is arranged above the test table, an indicator meter is arranged beside the human-machine interaction panel, and an adjustment operation panel is arranged on the front side of the test table.

3. The threaded cartridge hydraulic valve test bench according to claim 1, characterized in that: A cleaning head is provided at one end of the cleaning column, which is embedded in the filter tank and attached to the filter net. A friction wheel is provided at the other end of the cleaning column. A plurality of friction strips are provided on the inner wall of the outer shell, and the friction strips and the friction wheels correspond one to one. Positioning holes are provided on the top surfaces of the mounting block and the outer ring of the bearing sleeve, and an installation component for fixing the cleaning mechanism is provided in the lifting ring.

4. A threaded cartridge hydraulic valve test bench according to claim 3, characterized in that: The friction strip is provided with an inclined surface, which is in close contact with the friction wheel. Both the friction wheel and the inclined surface are provided with convex ridges, which increase the friction force between the friction wheel and the inclined surface of the friction strip.

5. The threaded cartridge hydraulic valve test bench according to claim 3, characterized in that: The mounting assembly includes an inner ring, which is movably arranged in a cavity in the lifting ring. A plurality of groups of positioning pins are arranged on the bottom surface of the lifting ring. The positioning pins are correspondingly inserted in the positioning holes. A plurality of compression springs are arranged on the upper surface of the inner ring. Two push rods are arranged on the inner ring. Two stoppers are arranged on the inner side wall of the outer shell. The stoppers correspond to the push rods one by one, and the stoppers are located below the push rods.

6. The threaded cartridge hydraulic valve test bench according to claim 1, characterized in that: One end of the movable clamping column inserted in the connecting part is connected with a traction belt, and the traction belt passes around the pulley and is connected to the pressing column.

7. The threaded cartridge hydraulic valve test bench according to claim 1, characterized in that: Sealing grooves are provided on the top and side walls of the bottom window, a sealing plate is embedded in the sealing groove, a sealing airbag is embedded in the edge of the sealing plate, an inner plate is provided inside the sealing plate, an air storage bag is connected to the bottom of the inner plate, the air storage bag and the sealing airbag are connected through an air pipe, two movable columns are provided on the top of the inner plate, the movable columns pass through the top surface of the sealing plate, and reset springs are provided on both sides of the movable columns.

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