Pressure resistance testing device for thermal management pile-up valve

Abstract

The invention is applicable to the related technical field of valve body detection, and provides a pressure resistance testing device for a thermal management pile-up valve, which comprises a bottom plate, a placement plate for placing a pile-up valve main body is arranged on the bottom plate, a liquid inlet end and an air inlet end are arranged on the pile-up valve main body, and a power unit is arranged on the bottom plate. The power unit is fixedly connected with the two symmetrically-arranged movable plates, the containing plate is provided with a first connecting unit used for being aligned with the liquid inlet end and the air inlet end, and the movable plates are provided with second connecting units used for being aligned with the first connecting unit. The power unit can drive the moving plate to move and drive the first connecting unit and the second connecting unit to move, so that the detection pump can drive a liquid phase and a gas phase in the liquid collecting box and the gas collecting box to pass through the liquid inlet end and the gas inlet end of the pile-up valve; and the pressure resistance of the pile-up valve is detected through a pressure monitoring meter on the control box body.

Description

Technical Field

[0001] The present invention belongs to the technical field related to valve body detection, and in particular relates to a pressure resistance performance testing device for a thermal management integrated valve. Background Art

[0002] The thermal management integrated valve is a key component used in vehicle thermal management systems. It integrates multiple valves and control functions, replacing multiple independent valves and complex pipe connections in traditional thermal management systems, reducing the number of components and pipe lengths, reducing system complexity and cost, while also saving space inside the vehicle and benefiting the overall layout of the vehicle. When working, it can control the flow direction of media in various states such as liquid or gas phases through the flow channels inside it.

[0003] Thermal management integrated valves need to be tested for their pressure resistance during manufacturing and actual use. Existing testing devices generally connect the two ends and then input liquid or gas phase for testing. There are also devices that place multiple thermal management integrated valves into one testing device and then test them together. However, this type of equipment has some shortcomings when it is actually used. During the test, if one of the thermal integrated management valves is found to have a problem, it cannot be removed separately and the next thermal integrated management valve can be tested. The entire device can only be stopped. The startup of the device often consumes the most energy and causes energy waste. Based on this, a pressure resistance performance testing device for a thermal management integrated valve is proposed that can solve the above problems. Summary of the Invention

[0004] The present invention provides a pressure resistance performance testing device for a thermal management integrated valve, which aims to solve the problem that when performing a test, if one of the thermal integrated management valves is found to have a problem, it cannot be removed separately to test the next thermal integrated management valve, and the entire device can only be stopped. The startup of the device often consumes the most energy, which will cause energy waste.

[0005] The present invention is implemented as follows: a pressure resistance performance testing device for a thermal management integrated valve comprises a base plate, a placement plate for placing the integrated valve body is provided on the base plate, a liquid inlet end and an air inlet end are provided on the integrated valve body, a power unit is provided on the base plate, the power unit is fixedly connected to two symmetrically arranged movable plates, one of the movable plates is provided with a detection pump, the input end of the detection pump is connected to a liquid collecting box and an air collecting box, the liquid collecting box and the air collecting box are fixedly connected to the movable plate, the other movable plate is fixedly connected with a control box, the control box is provided with a pressure monitoring gauge, a first connection unit for aligning with the liquid inlet end and the air inlet end is provided on the placement plate, and a second connection unit for aligning with the first connection unit is provided on the movable plate.

[0006] Preferably, the power unit includes a bidirectional motor fixedly connected to the base plate, the output end of the bidirectional motor is fixedly connected to a reciprocating screw, a symmetrically arranged first connecting plate is fixedly connected to the base plate, the end of the reciprocating screw is rotatably connected to the first connecting plate, a limiting rod is fixedly connected between the bidirectional motor and the first connecting plate, a reciprocating slider is sleeved on the outer side of the reciprocating screw, the limiting rod passes through the reciprocating slider, and the side of the reciprocating slider is fixedly connected to the movable plate through a first connecting block.

[0007] Preferably, the first connecting unit includes a plurality of second connecting plates symmetrically arranged and fixedly connected to the side of the placement plate, a plurality of first through grooves are opened on the second connecting plates, a guide protrusion is provided in the first through groove, a first moving block is slidably connected in the first through groove, a connecting outer tube is fixedly connected to the first moving block, the first moving block is a hollow structure, and the end of the first moving block is flush with the liquid inlet end and the air inlet end.

[0008] Preferably, the first moving block is fixedly connected with a limiting rubber protrusion at the liquid inlet end and the air inlet end.

[0009] Preferably, the second connecting unit includes a plurality of third connecting plates, the third connecting plates are fixedly connected to the movable plate through a first connecting rod, a first through groove is also provided on the third connecting plate, a guide protrusion is provided in the first through groove, a first movable block is slidably connected in the first through groove, a connecting inner tube is inserted into the first movable block, and the connecting inner tube is connected to the movable plate through a connecting hose.

[0010] Preferably, the connecting inner tube and the connecting outer tube are cooperatively provided with a detachment unit.

[0011] Preferably, the disengagement unit includes a fourth connecting plate fixedly connected to one end of the connecting inner tube, the fourth connecting plate is connected to the third connecting plate by a first spring for providing elastic force, the first spring is sleeved on the outer side of the connecting inner tube, a second moving block is inserted into the connecting inner tube, one side of the second moving block is fixedly connected to the third moving block, a first inclined surface is provided on the third moving block, and the other side of the second moving block is fixedly connected to a symmetrically arranged clamping protrusion, the second connecting block is fixedly connected to the connecting outer tube, and a moving groove that cooperates with the clamping protrusion is provided in the second connecting block.

[0012] Preferably, a magnetic plate is fixedly connected to the outer side of the connecting inner tube, and the magnetic plate is magnetically connected to the movable plate.

[0013] Preferably, a placement groove for placing the integrated valve body is provided on the placement plate, and a limiting unit for limiting the integrated valve body is provided on the placement plate.

[0014] Preferably, the limiting unit includes a first lower pressure plate, the upper end of the first lower pressure plate is fixedly connected to a lower pressure rod, a second through groove is provided on the placement plate, the upper end of the lower pressure rod is fixedly connected to a lower pressure block, a second inclined surface is provided on the lower pressure block, the outer side of the connecting inner tube is fixedly connected to a connecting ring, the upper end of the connecting ring is fixedly connected to a second connecting rod, the second connecting rod is fixedly connected to the second lower pressure plate, and the upper end of the first lower pressure plate is connected to the movable plate via a second spring for providing elastic force.

[0015] Compared with the prior art, the embodiments of the present application have the following beneficial effects: Through the setting of the separation unit, the detection pump can drive the liquid phase and gas phase in the liquid collecting box and the gas collecting box to pass through the liquid inlet end and the gas inlet end on the integrated valve, and the control box can control the detection of any of the integrated valve bodies. During the detection, under the action of the pressure of the liquid phase and the gas phase, the second moving block drives the third moving block to move in the moving groove. The third moving block and the clamping protrusion can limit the position of the connecting inner tube. When the integrated valve body needs to be replaced, the reciprocating slider drives the moving plate to move and drives the third connecting plate to move. The magnetic plate of the connecting inner tube at the detection position is separated from the third connecting plate and the first spring is compressed. The connecting inner tube that is not detected moves until the connecting inner tube is separated from the connecting outer tube. At this time, the integrated valve body can be replaced without stopping the entire device, and the integrated valve body can be replaced separately for the next step of detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of a pressure resistance performance test device for a thermal management integrated valve provided by the present invention. Figure 1 ; Figure 2 yes Figure 1 Schematic diagram of the enlarged structure at A in the middle; Figure 3 yes Figure 1 Schematic diagram of the enlarged structure at B in the middle; Figure 4 This is a schematic diagram of the overall structure of a pressure resistance performance test device for a thermal management integrated valve provided by the present invention. Figure 2 ; Figure 5 yes Figure 4 Schematic diagram of the enlarged structure at C in the middle; Figure 6 yes Figure 4 Schematic diagram of the enlarged structure at D in the middle; Figure 7 This is a structural schematic diagram of a limit unit in a pressure resistance performance testing device for a thermal management integrated valve provided by the present invention; Figure 8 This is a structural schematic diagram of the second connection unit in a pressure resistance performance testing device for a thermal management integrated valve provided by the present invention; Figure 9 It is a partial structural schematic diagram of a separation unit in a pressure resistance performance testing device for a thermal management integrated valve provided by the present invention.

[0017] Figure numerals: 1. Bottom plate; 2. Integrated valve body; 3. Placement plate; 4. Liquid inlet end; 5. Air inlet end; 6. Moving plate; 7. Detection pump; 8. Liquid collecting box; 9. Air collecting box; 10. Control box; 11. Pressure monitoring gauge; 12. Bidirectional motor; 13. Reciprocating screw; 14. First connecting plate; 15. Limit rod; 16. Reciprocating slider; 17. First connecting block; 18. Second connecting plate; 19. First through groove; 20. Guide protrusion; 21. First moving block; 22. Connecting outer tube; 23. Limiting rubber protrusion; 24. First Three connecting plates; 25. First connecting rod; 26. Connecting inner tube; 27. Connecting hose; 28. Fourth connecting plate; 29. ​​First spring; 30. Second moving block; 31. Third moving block; 32. First inclined surface; 33. Clamping protrusion; 34. Second connecting block; 35. Moving groove; 36. Magnetic plate; 37. Placement groove; 38. First pressing plate; 39. Pressing rod; 40. Second through groove; 41. Pressing block; 42. Second inclined surface; 43. Connecting ring; 44. Second connecting rod; 45. Second pressing plate; 46. Second spring. DETAILED DESCRIPTION

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0019] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0020] The embodiment of the present invention provides a pressure resistance performance testing device for a thermal management integrated valve, such as Figures 1-9 As shown, it includes a base plate 1, on which a placement plate 3 for placing an integrated valve body 2 is provided, and the integrated valve body 2 is provided with a liquid inlet end 4 and an air inlet end 5, and a power unit is provided on the base plate 1, and the power unit is fixedly connected to two symmetrically arranged movable plates 6, one of which is provided with a detection pump 7, and the input end of the detection pump 7 is connected to a liquid collecting box 8 and an air collecting box 9, and the liquid collecting box 8 and the air collecting box 9 are fixedly connected to the movable plate 6, and the other movable plate 6 is fixedly connected with a control box 10, and a pressure monitoring gauge 11 is provided on the control box 10, and a first connecting unit for aligning with the liquid inlet end 4 and the air inlet end 5 is provided on the placement plate 3, and a second connecting unit for aligning with the first connecting unit is provided on the movable plate 6.

[0021] When the above-mentioned device is actually used, the integrated valve body 2 is placed on the placement plate 3, and the power unit can drive the movable plate 6 to move, and drive the first connecting unit and the second connecting unit to move, so that the detection pump 7 can drive the liquid phase and the gas phase in the liquid collecting tank 8 and the gas collecting tank 9 to pass through the liquid inlet end 4 and the gas inlet end 5 on the integrated valve, and the pressure resistance performance of the integrated valve is tested through the pressure monitoring gauge 11 on the control box 10.

[0022] The power unit includes a bidirectional motor 12 fixedly connected to the base plate 1, the output end of the bidirectional motor 12 is fixedly connected to a reciprocating screw 13, a symmetrically arranged first connecting plate 14 is fixedly connected to the base plate 1, the end of the reciprocating screw 13 is rotatably connected to the first connecting plate 14, a limiting rod 15 is fixedly connected between the bidirectional motor 12 and the first connecting plate 14, a reciprocating slider 16 is sleeved on the outer side of the reciprocating screw 13, the limiting rod 15 passes through the reciprocating slider 16, and the side of the reciprocating slider 16 is fixedly connected to the moving plate 6 through a first connecting block 17.

[0023] When the power unit is actually used, the bidirectional motor 12 rotates to drive the reciprocating screw 13 to rotate and then drives the reciprocating slider 16 to move back and forth. The movement of the reciprocating slider 16 can drive the moving plate 6 to move.

[0024] Combine Figure 3 、 Figure 5 、 Figure 6 、 Figure 8 and Figure 9 The first connecting unit includes a plurality of second connecting plates 18 symmetrically arranged and fixedly connected to the side of the placement plate 3, and a plurality of first through-grooves 19 are provided on the second connecting plates 18. A guide protrusion 20 is provided in the first through-grooves 19, and a first moving block 21 is slidably connected in the first through-grooves 19. A connecting outer tube 22 is fixedly connected to the first moving block 21. The first moving block 21 is a hollow structure, and the ends of the first moving block 21 are flush with the liquid inlet end 4 and the air inlet end 5.

[0025] The first moving block 21 is fixedly connected to a limiting rubber protrusion 23 at the liquid inlet end 4 and the air inlet end 5 .

[0026] When the above-mentioned first connecting unit is actually used, the first movable block 21 is moved on the first through groove 19. The position of the first movable block 21 corresponds to the position of the placed integrated valve body 2, so that the connecting outer tube 22 is connected to the liquid inlet end 4 and the air inlet end 5 on the integrated valve body 2, which is convenient for testing the pressure resistance performance of the integrated valve body 2. The elastic force of the limiting rubber protrusion 23 can limit the position of the connecting outer tube 22, ensuring that the connecting outer tube 22 is aligned with the liquid inlet end 4 and the air inlet end 5.

[0027] The second connecting unit includes a plurality of third connecting plates 24, which are fixedly connected to the movable plate 6 through a first connecting rod 25. A first through groove 19 is also provided on the third connecting plate 24, and a guide protrusion 20 is provided in the first through groove 19. A first movable block 21 is slidably connected in the first through groove 19, and a connecting inner tube 26 is inserted into the first movable block 21. The connecting inner tube 26 is connected to the movable plate 6 through a connecting hose 27.

[0028] When the above-mentioned second connecting unit is actually used, the connecting inner tube 26 can be connected to the connecting outer tube 22 under the drive of the first moving block 21, and the connecting inner tube 26 can be inserted into the connecting outer tube 22 under the drive of the reciprocating slider 16, and inserted into the liquid inlet end 4 and the air inlet end 5, so as to detect the integrated valve.

[0029] The connecting inner tube 26 and the connecting outer tube 22 are cooperatively provided with a separation unit.

[0030] The disengagement unit includes a fourth connecting plate 28 fixedly connected to one end of the connecting inner tube 26, and the fourth connecting plate 28 is connected to the third connecting plate 24 via a first spring 29 for providing elastic force. The first spring 29 is sleeved on the outside of the connecting inner tube 26, and a second movable block 30 is inserted into the connecting inner tube 26. One side of the second movable block 30 is fixedly connected to a third movable block 31, and a first inclined surface 32 is provided on the third movable block 31. The other side of the second movable block 30 is fixedly connected to a symmetrically arranged snap-in protrusion 33, and a second connecting block 34 is fixedly connected to the connecting outer tube 22, and a movable groove 35 that cooperates with the snap-in protrusion 33 is provided in the second connecting block 34.

[0031] A magnetic plate 36 is fixedly connected to the outer side of the connecting inner tube 26 , and the magnetic plate 36 is magnetically connected to the movable plate 6 .

[0032] When the above-mentioned separation unit is actually used, the detection pump 7 can drive the liquid phase and gas phase in the liquid collecting box 8 and the gas collecting box 9 to pass through the liquid inlet end 4 and the gas inlet end 5 on the integrated valve, and the control box 10 can control the detection of any integrated valve body 2. During the detection, under the action of the pressure of the liquid phase and the gas phase, the second moving block 30 drives the third moving block 31 to move in the moving groove 35. The third moving block 31 and the clamping protrusion 33 can limit the position of the connecting inner tube 26. When the integrated valve body 2 needs to be replaced, the reciprocating slider 16 drives the moving plate 6 to move and drives the third connecting plate 24 to move. The magnetic plate 36 of the connecting inner tube 26 at the detection position is separated from the third connecting plate 24 and compresses the first spring 29. The connecting inner tube 26 that is not detected moves until the connecting inner tube 26 is separated from the connecting outer tube 22. At this time, the integrated valve body 2 can be replaced for the next step of detection.

[0033] The placement plate 3 is provided with a placement groove 37 for placing the integrated valve body 2 , and the placement plate 3 is provided with a limiting unit for limiting the integrated valve body 2 .

[0034] Combine Figure 2 and Figure 9 The limiting unit includes a first lower pressure plate 38, the upper end of the first lower pressure plate 38 is fixedly connected to a lower pressure rod 39, a second through groove 40 is provided on the placing plate 3, the upper end of the lower pressure rod 39 is fixedly connected to a lower pressure block 41, and a second inclined surface 42 is provided on the lower pressure block 41, and the outer side of the connecting inner tube 26 is fixedly connected to a connecting ring 43, and the upper end of the connecting ring 43 is fixedly connected to a second connecting rod 44, and the second connecting rod 44 is fixedly connected to the second lower pressure plate 45. The upper end of the first lower pressure plate 38 is connected to the movable plate 6 through a second spring 46 for providing elastic force.

[0035] When the above-mentioned limiting unit is actually used, when the connecting inner tube 26 extends into the interior of the connecting outer tube 22, the second lower pressure plate 45 contacts the second inclined surface 42, driving the first lower pressure plate 38 and the lower pressure block 41 to move downward, and the first lower pressure plate 38 presses down on the integrated valve body 2 to limit the integrated valve body 2.

[0036] To sum up, the working principle of the present invention is as follows: the first moving block 21 is moved on the first through groove 19, and the position of the first moving block 21 corresponds to the position of the placed integrated valve body 2, so that the connecting outer tube 22 is connected with the liquid inlet end 4 and the air inlet end 5 on the integrated valve body 2, which is convenient for testing the pressure resistance of the integrated valve body 2, and the elastic force of the limiting rubber protrusion 23 can limit the position of the connecting outer tube 22, ensuring that the connecting outer tube 22 is aligned with the liquid inlet end 4 and the air inlet end 5; the detection pump 7 can drive the liquid phase and the gas phase in the liquid collecting box 8 and the gas collecting box 9 to pass through the liquid inlet end 4 and the air inlet end 5 on the integrated valve, and the control box 10 can control the detection of any of the integrated valve bodies 2. During the detection, under the pressure of the liquid phase and the gas phase, the second moving block 30 drives the third moving block 31 to move in the moving groove 35 The third moving block 31 and the engaging protrusion 33 can limit the position of the connecting inner tube 26. When the integrated valve body 2 needs to be replaced, the reciprocating slider 16 drives the moving plate 6 to move, and drives the third connecting plate 24 to move. The magnetic plate 36 of the connecting inner tube 26 in the detection position is separated from the third connecting plate 24 and compresses the first spring 29. The connecting inner tube 26 that is not detected moves until the connecting inner tube 26 is separated from the connecting outer tube 22. At this time, the integrated valve body 2 can be replaced for the next step of detection; when the connecting inner tube 26 extends into the interior of the connecting outer tube 22, the second lower pressure plate 45 contacts the second inclined surface 42, driving the first lower pressure plate 38 and the lower pressure block 41 to move downward, and the first lower pressure plate 38 presses down on the integrated valve body 2 to limit the integrated valve body 2.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A pressure resistance performance testing device for a thermal management integrated valve, comprising a base plate (1), characterized in that: The bottom plate (1) is provided with a placement plate (3) for placing the integrated valve body (2), the integrated valve body (2) is provided with a liquid inlet end (4) and an air inlet end (5), the bottom plate (1) is provided with a power unit, the power unit is fixedly connected to two symmetrically arranged movable plates (6), one of the movable plates (6) is provided with a detection pump (7), the input end of the detection pump (7) is connected to a liquid collecting box (8) and an air collecting box (9), the liquid collecting box (8) and the air collecting box (9) are fixedly connected to the movable plate (6), the other movable plate (6) is fixedly connected with a control box (10), the control box (10) is provided with a pressure monitoring gauge (11), the placement plate (3) is provided with a first connection unit for aligning with the liquid inlet end (4) and the air inlet end (5), and the movable plate (6) is provided with a second connection unit for aligning with the first connection unit.

2. A pressure resistance performance testing device for a thermal management integrated valve according to claim 1, characterized in that: The power unit comprises a bidirectional motor (12) fixedly connected to the base plate (1), an output end of the bidirectional motor (12) is fixedly connected to a reciprocating screw (13), a symmetrically arranged first connecting plate (14) is fixedly connected to the base plate (1), an end of the reciprocating screw (13) is rotatably connected to the first connecting plate (14), a limiting rod (15) is fixedly connected between the bidirectional motor (12) and the first connecting plate (14), a reciprocating slider (16) is sleeved on the outer side of the reciprocating screw (13), the limiting rod (15) passes through the reciprocating slider (16), and the side of the reciprocating slider (16) is fixedly connected to the movable plate (6) via a first connecting block (17).

3. A pressure resistance performance testing device for a thermal management integrated valve according to claim 2, characterized in that: The first connecting unit comprises a plurality of second connecting plates (18) symmetrically arranged and fixedly connected to the side of the placement plate (3); a plurality of first through-grooves (19) are provided on the second connecting plates (18); a guide protrusion (20) is provided in the first through-grooves (19); a first moving block (21) is slidably connected in the first through-grooves (19); a connecting outer tube (22) is fixedly connected to the first moving block (21); the first moving block (21) is a hollow structure; and the ends of the first moving block (21) are flush with the liquid inlet end (4) and the air inlet end (5).

4. A pressure resistance performance testing device for a thermal management integrated valve according to claim 3, characterized in that: A limiting rubber protrusion (23) that cooperates with the liquid inlet end (4) and the air inlet end (5) is fixedly connected to the first moving block (21).

5. The pressure resistance performance testing device of a thermal management integrated valve according to claim 3, characterized in that: The second connecting unit includes a plurality of third connecting plates (24), the third connecting plates (24) being fixedly connected to the movable plate (6) via a first connecting rod (25), a first through-groove (19) being provided on the third connecting plate (24), a guide protrusion (20) being provided in the first through-groove (19), a first movable block (21) being slidably connected in the first through-groove (19), a connecting inner tube (26) being inserted into the first movable block (21), and the connecting inner tube (26) being connected to the movable plate (6) via a connecting hose (27).

6. The pressure resistance performance testing device of a thermal management integrated valve according to claim 5, characterized in that: The connecting inner tube (26) and the connecting outer tube (22) are cooperatively provided with a separation unit.

7. The pressure resistance performance testing device of a thermal management integrated valve according to claim 6, characterized in that: The disengagement unit comprises a fourth connecting plate (28) fixedly connected to one end of the connecting inner tube (26), the fourth connecting plate (28) being connected to the third connecting plate (24) via a first spring (29) for providing elastic force, the first spring (29) being sleeved on the outer side of the connecting inner tube (26), a second moving block (30) being inserted into the connecting inner tube (26), a third moving block (31) being fixedly connected to one side of the second moving block (30), a first inclined surface (32) being provided on the third moving block (31), a symmetrically arranged snap-fitting protrusion (33) being fixedly connected to the other side of the second moving block (30), a second connecting block (34) being fixedly connected to the connecting outer tube (22), a moving groove (35) cooperating with the snap-fitting protrusion (33) being provided in the second connecting block (34).

8. The pressure resistance performance testing device of a thermal management integrated valve according to claim 7, characterized in that: A magnetic plate (36) is fixedly connected to the outer side of the connecting inner tube (26), and the magnetic plate (36) is magnetically connected to the movable plate (6).

9. The pressure resistance performance testing device of a thermal management integrated valve according to claim 5, characterized in that: The placement plate (3) is provided with a placement groove (37) for placing the integrated valve body (2), and the placement plate (3) is provided with a limiting unit for limiting the integrated valve body (2).

10. The pressure resistance performance testing device of a thermal management integrated valve according to claim 9, characterized in that: The limiting unit includes a first lower pressing plate (38), the upper end of the first lower pressing plate (38) is fixedly connected to a lower pressing rod (39), a second through groove (40) is provided on the placement plate (3), the upper end of the lower pressing rod (39) is fixedly connected to a lower pressing block (41), a second inclined surface (42) is provided on the lower pressing block (41), the outer side of the connecting inner tube (26) is fixedly connected to a connecting ring (43), the upper end of the connecting ring (43) is fixedly connected to a second connecting rod (44), the second connecting rod (44) is fixedly connected to the second lower pressing plate (45), and the upper end of the first lower pressing plate (38) is connected to the movable plate (6) via a second spring (46) for providing elastic force.

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