A pressure resistance performance testing device of a thermal management integrated valve

Abstract

The application is suitable for the technical field of valve body detection, and provides a pressure resistance performance testing device for a thermal management integrated valve, which comprises a bottom plate, a placing plate for placing an integrated valve body is arranged on the bottom plate, a liquid inlet end and an air inlet end are arranged on the integrated valve body, a power unit is arranged on the bottom plate, the power unit is fixedly connected with two symmetrical moving plate pieces, a first connecting unit for aligning with the liquid inlet end and the air inlet end is arranged on the placing plate, a second connecting unit for aligning with the first connecting unit is arranged on the moving plate piece, the integrated valve body is placed on the placing plate, the power unit can drive the moving plate piece to move, the first connecting unit and the second connecting unit are driven to move, so that the liquid phase and the gas phase in the liquid collecting tank and the gas collecting tank can pass through the liquid inlet end and the air inlet end on the integrated valve under the action of the detection pump, and the pressure resistance performance of the integrated valve is detected through the pressure monitor on the control box.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of valve detection, and particularly relates to a pressure resistance performance testing device for a thermal management integrated valve. BACKGROUND

[0002] The thermal management integrated valve is a key component for a vehicle thermal management system, integrates multiple valves and control functions, replaces multiple independent valves and complex pipeline connections in a traditional thermal management system, reduces the number of parts and pipeline length, reduces the complexity and cost of the system, saves the space in the vehicle, and is beneficial to the overall layout of the vehicle. When the thermal management integrated valve works, it can control the flow direction of media in liquid phase or gas phase and the like through the flow channel in the thermal management integrated valve.

[0003] The thermal management integrated valve needs to be detected for pressure resistance performance from manufacturing to actual use. The existing detection device generally communicates two ends, and then inputs liquid phase or gas phase for detection. Now, there is also a device for placing multiple thermal management integrated valves in one detection device and then uniformly detecting. However, when the device is actually used, there are some deficiencies. When detection is performed, if one of the thermal integrated management valves is found to have a problem, the device cannot be taken down alone for detection of the next thermal integrated management valve, and the device has to be stopped as a whole. The start of the device often consumes the most energy, which causes waste of energy. Based on this, the present application provides a pressure resistance performance testing device for a thermal management integrated valve which can solve the above problems. SUMMARY

[0004] The present application provides a pressure resistance performance testing device for a thermal management integrated valve, which aims to solve the problem that when detection is performed, if one of the thermal integrated management valves is found to have a problem, the device cannot be taken down alone for detection of the next thermal integrated management valve, and the device has to be stopped as a whole. The start of the device often consumes the most energy, which causes waste of energy.

[0005] The present application is implemented as follows. A pressure resistance performance testing device for a thermal management integrated valve includes a bottom plate, a placing plate for placing an integrated valve body is arranged on the bottom plate, a liquid inlet end and a gas inlet end are arranged on the integrated valve body, a power unit is arranged on the bottom plate, the power unit is fixedly connected with two moving plate members arranged symmetrically, a detection pump is arranged on one of the moving plate members, an input end of the detection pump is connected with a liquid collecting tank and a gas collecting tank, the liquid collecting tank and the gas collecting tank are fixedly connected with the moving plate member, a control box body is fixedly connected with the other moving plate member, a pressure monitoring table is arranged on the control box body, a first connecting unit for aligning with the liquid inlet end and the gas inlet end is arranged on the placing plate, and a second connecting unit for aligning with the first connecting unit is arranged on the moving plate member.

[0006] Preferably, the power unit comprises a bidirectional motor fixedly connected to the bottom plate, an output end of the bidirectional motor is fixedly connected with a reciprocating screw rod, the bottom plate is fixedly connected with symmetrically arranged first connecting plates, end portions of the reciprocating screw rod are rotationally connected with the first connecting plates, a limiting rod is fixedly connected between the bidirectional motor and the first connecting plates, an outer side of the reciprocating screw rod is sleeved with a reciprocating sliding block, the limiting rod penetrates through the reciprocating sliding block, and side surfaces of the reciprocating sliding block are fixedly connected with the moving plate through first connecting blocks.

[0007] Preferably, the first connecting unit comprises a plurality of second connecting plates fixedly connected to side surfaces of the placing plate and symmetrically arranged, a plurality of first through grooves are formed in the second connecting plates, guide protrusions are arranged in the first through grooves, first moving blocks are slidably connected in the first through grooves, connecting outer pipes are fixedly connected to the first moving blocks, the first moving blocks are of hollow structures, and end portions of the first moving blocks are flush with the liquid inlet end and the gas inlet end.

[0008] Preferably, limiting rubber protrusions are fixedly connected to the first moving blocks and limit the liquid inlet end and the gas inlet end.

[0009] Preferably, the second connecting unit comprises a plurality of third connecting plates, the third connecting plates are fixedly connected with the moving plate through first connecting rods, first through grooves are also formed in the third connecting plates, guide protrusions are arranged in the first through grooves, first moving blocks are slidably connected in the first through grooves, connecting inner pipes are inserted into the first moving blocks, and the connecting inner pipes are connected with the moving plate through connecting hoses.

[0010] Preferably, disengagement units are cooperatively arranged on the connecting inner pipes and the connecting outer pipes.

[0011] Preferably, the disengagement unit comprises a fourth connecting plate fixedly connected to one end of the connecting inner pipe, the fourth connecting plate is connected with the third connecting plate through a first spring for providing elasticity, the first spring is sleeved on an outer side of the connecting inner pipe, a second moving block is inserted into the connecting inner pipe, a third moving block is fixedly connected to one side of the second moving block, a first inclined surface is arranged on the third moving block, symmetrically arranged clamping protrusions are fixedly connected to the other side of the second moving block, a second connecting block is fixedly connected to the connecting outer pipe, and a moving groove matched with the clamping protrusions is formed in the second connecting block.

[0012] Preferably, a magnetic plate is fixedly connected to an outer side of the connecting inner pipe, and the magnetic plate is magnetically connected with the moving plate.

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

[0014] Preferably, the limiting unit comprises a first lower pressing plate, a lower pressing rod is fixedly connected to the upper end of the first lower pressing plate, a second through groove is formed in the placement plate, a lower pressing block is fixedly connected to the upper end of the lower pressing rod, a second inclined surface is arranged on the lower pressing block, a connecting ring is fixedly connected to the outer side of the connecting inner tube, a second connecting rod is fixedly connected to the upper end of the connecting ring, the second connecting rod is fixedly connected with the second lower pressing plate, and the upper end of the first lower pressing plate is connected with the moving plate through a second spring for providing elastic force.

[0015] Compared with the prior art, the embodiment of the present application has the following beneficial effects:

[0016] Through the arrangement of the disengagement unit, the detection pump can drive the liquid phase and the gas phase in the liquid collecting tank and the gas collecting tank to pass through the liquid inlet end and the gas inlet end of the integrated valve, and the control box can control the detection of any integrated valve body therein. Under the pressure action of the liquid phase and the gas phase, the second moving block drives the third moving block to move in the moving groove during detection. The third moving block and the clamping protrusion can limit the position of the connecting inner tube. When it is necessary to replace the integrated valve body, the reciprocating slide block drives the moving plate to move, drives the third connecting plate to move, and the magnetic plate of the connecting inner tube at the detection position is disengaged from the third connecting plate and compresses the first spring. The connecting inner tube that does not need to be detected is moved until the connecting inner tube is disengaged 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 individually for the next detection. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is the overall structure schematic of the pressure resistance performance testing device of the thermal management integrated valve provided by the present application Figure 1 ;

[0018] Figure 2 is Figure 1 the enlarged structure schematic of A in FIG. 4;

[0019] Figure 3 is Figure 1 the enlarged structure schematic of B in FIG. 4;

[0020] Figure 4 is the overall structure schematic of the pressure resistance performance testing device of the thermal management integrated valve provided by the present application Figure 2 ;

[0021] Figure 5 is Figure 4An enlarged structural schematic view at C;

[0022] Figure 6 is Figure 4 An enlarged structural schematic view at D;

[0023] Figure 7 is a structural schematic view of a limiting unit in a pressure resistance performance testing device of a thermal management integrated valve provided by the present application;

[0024] Figure 8 is a structural schematic view of a second connecting unit in a pressure resistance performance testing device of a thermal management integrated valve provided by the present application;

[0025] Figure 9 is a partial structural schematic view of a disengaging unit in a pressure resistance performance testing device of a thermal management integrated valve provided by the present application.

[0026] The figure mark annotation: 1, bottom plate; 2, integrated valve body; 3, placing plate; 4, liquid inlet end; 5, gas inlet end; 6, moving plate piece; 7, detection pump; 8, liquid collecting tank; 9, gas collecting tank; 10, control box; 11, pressure monitoring table; 12, bidirectional motor; 13, reciprocating screw rod; 14, first connecting plate; 15, limiting rod; 16, reciprocating sliding block; 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, third connecting plate; 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 force plate; 37, placing groove; 38, first lower pressing plate; 39, lower pressing rod; 40, second through groove; 41, lower pressing block; 42, second inclined surface; 43, connecting ring; 44, second connecting rod; 45, second lower pressing plate; 46, second spring. DETAILED DESCRIPTION

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application; the present application will be described with reference to the drawings and detailed description which follows, and by identifying specific embodiments thereof, it will be understood that various embodiments of the present application include combinations of features from those described, including structural and experimental combinations, where such combinations are not expressly stated in the claims.

[0028] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0029] This invention provides a pressure resistance testing device for a thermal management integrated valve, such as... Figures 1-9 As shown, the system includes a base plate 1, on which a placement plate 3 is provided for placing the integrated valve body 2. The integrated valve body 2 is provided with a liquid inlet 4 and an air inlet 5. 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 the movable plates 6 is provided with a detection pump 7, the input end of which is connected to a liquid collection tank 8 and an air collection tank 9. The liquid collection tank 8 and the air collection tank 9 are fixedly connected to the movable plate 6. A control box 10 is fixedly connected to the other movable plate 6, and a pressure monitoring gauge 11 is provided on the control box 10. The placement plate 3 is provided with a first connecting unit for aligning with the liquid inlet 4 and the air inlet 5, and the movable plate 6 is provided with a second connecting unit for aligning with the first connecting unit.

[0030] When the above device is actually used, the integrated valve body 2 is placed on the placement plate 3. The power unit can drive the moving 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 gas phase in the liquid collection tank 8 and the gas collection tank 9 to pass through the liquid inlet 4 and the gas inlet 5 on the integrated valve, and the pressure resistance performance of the integrated valve is detected by the pressure monitoring gauge 11 on the control box 10.

[0031] The power unit includes a bidirectional motor 12 fixedly connected to the base plate 1. A reciprocating lead screw 13 is fixedly connected to the output end of the bidirectional motor 12. A first connecting plate 14 symmetrically arranged is fixedly connected to the base plate 1. The end of the reciprocating lead 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 outside of the reciprocating lead screw 13. The limiting rod 15 passes through the reciprocating slider 16. The side of the reciprocating slider 16 is fixedly connected to the moving plate 6 through a first connecting block 17.

[0032] When the aforementioned power unit is actually in use, the bidirectional motor 12 rotates, driving the reciprocating lead screw 13 to rotate, which in turn 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.

[0033] In combination Figure 3 , Figure 5 , Figure 6 , Figure 8 and Figure 9 , the first connecting unit comprises a plurality of symmetrically arranged second connecting plates 18 fixedly connected to the side of the placement plate 3, a plurality of first through grooves 19 are formed on the second connecting plates 18, a guide protrusion 20 is arranged in the first through groove 19, a first moving block 21 is slidably connected in the first through groove 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 end of the first moving block 21 is flush with the liquid inlet end 4 and the gas inlet end 5.

[0034] The first moving block 21 is fixedly connected with a limiting rubber protrusion 23 limiting the liquid inlet end 4 and the gas inlet end 5.

[0035] The first connecting unit is actually used, the first moving block 21 is moved on the first through groove 19, 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 in communication with the liquid inlet end 4 and the gas inlet end 5 on the integrated valve body 2, which is convenient for detecting 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, so as to ensure that the connecting outer tube 22 is aligned with the liquid inlet end 4 and the gas inlet end 5.

[0036] The second connecting unit comprises a plurality of third connecting plates 24, the third connecting plates 24 are fixedly connected with the moving plate 6 through first connecting rods 25, the first through grooves 19 are also formed on the third connecting plates 24, the guide protrusions 20 are arranged in the first through grooves 19, the first moving blocks 21 are slidably connected in the first through grooves 19, the connecting inner tubes 26 are inserted into the first moving blocks 21, and the connecting inner tubes 26 are connected with the moving plate 6 through the connecting hoses 27.

[0037] The second connecting unit is actually used, the connecting inner tube 26 can be connected with the connecting outer tube 22 under the driving of the first moving block 21, the connecting inner tube 26 can be inserted into the connecting outer tube 22 and the liquid inlet end 4 and the gas inlet end 5 under the driving of the reciprocating sliding block 16, so as to detect the integrated valve.

[0038] The connecting inner tube 26 and the connecting outer tube 22 are cooperatively provided with a disengagement unit.

[0039] 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 is connected with the third connecting plate 24 through a first spring 29 for providing elasticity, the first spring 29 is sleeved on the outer side of the connecting inner tube 26, a second moving block 30 is inserted in the connecting inner tube 26, one side of the second moving block 30 is fixedly connected with a third moving block 31, a first inclined surface 32 is arranged on the third moving block 31, the other side of the second moving block 30 is fixedly connected with symmetrically arranged clamping protrusions 33, a second connecting block 34 is fixedly connected to the connecting outer tube 22, and a moving groove 35 matched with the clamping protrusions 33 is formed in the second connecting block 34.

[0040] The outer side of the connecting inner tube 26 is fixedly connected with a magnetic plate 36, and the magnetic plate 36 is magnetically connected with the moving plate 6.

[0041] When the above-mentioned disengagement unit is actually used, 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 of the integrated valve, and the control box 10 can control any integrated valve body 2 to be detected. When detection is performed, 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, and the third moving block 31 and the clamping protrusions 33 can limit the position of the connecting inner tube 26. When it is necessary to replace the integrated valve body 2, the reciprocating sliding block 16 drives the moving plate 6 to move, drives the third connecting plate 24 to move, and the magnetic plate 36 of the connecting inner tube 26 at the detection position is disengaged from the third connecting plate 24 and compresses the first spring 29. The connecting inner tube 26 that does not need to be detected is moved until the connecting inner tube 26 is disengaged from the connecting outer tube 22, at which time the integrated valve body 2 can be replaced for the next detection.

[0042] The placing plate 3 is provided with a placing groove 37 for placing the integrated valve body 2, and the placing plate 3 is provided with a limiting unit for limiting the integrated valve body 2.

[0043] In combination Figure 2 and Figure 9 , the limiting unit comprises a first lower pressing plate 38, the upper end of the first lower pressing plate 38 is fixedly connected with a lower pressing rod 39, the placing plate 3 is provided with a second through groove 40, the upper end of the lower pressing rod 39 is fixedly connected with a lower pressing block 41, the lower pressing block 41 is provided with a second inclined surface 42, the outer side of the connecting inner tube 26 is fixedly connected with a connecting ring 43, the upper end of the connecting ring 43 is fixedly connected with a second connecting rod 44, the second connecting rod 44 is fixedly connected with a second lower pressing plate 45, and the upper end of the first lower pressing plate 38 is connected with the moving plate 6 through a second spring 46 for providing elasticity.

[0044] The limiting unit is used in practice, when the connecting inner tube 26 extends into the connecting outer tube 22, the second pressing plate 45 contacts the second inclined surface 42, drives the first pressing plate 38 and the pressing block 41 to move downwards, and the first pressing plate 38 presses the integrated valve body 2 to limit the integrated valve body 2.

[0045] In summary, the working principle of the present application is as follows: the first moving block 21 moves on the first through groove 19, 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 in communication with the liquid inlet end 4 and the gas inlet end 5 on the integrated valve body 2, which facilitates the detection of the pressure resistance 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, and ensure that the connecting outer tube 22 is aligned with the liquid inlet end 4 and the gas inlet end 5; the detection pump 7 can drive the liquid phase and the gas phase in the liquid tank 8 and the gas tank 9 to pass through the liquid inlet end 4 and the gas inlet end 5 on the integrated valve, the control box 10 can control the detection of any integrated valve body 2, 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 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 slide block 16 drives the moving plate 6 to move, 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 the first spring 29 is compressed, the connecting inner tube 26 that is not detected is moved 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 detection; when the connecting inner tube 26 extends into the connecting outer tube 22, the second pressing plate 45 contacts the second inclined surface 42, drives the first pressing plate 38 and the pressing block 41 to move downwards, and the first pressing plate 38 presses the integrated valve body 2 to limit the integrated valve body 2.

[0046] The above only describes the preferred embodiments of the present application, and is not intended to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A pressure resistance testing device for a thermal management integrated valve, comprising a base plate (1), characterized in that, The base 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 (4) and an air inlet (5). The base 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 the liquid collection tank (8) and the air collection tank (9). The liquid collection tank (8) and the air collection tank (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 (4) and the air inlet (5). The movable plate (6) is provided with a second connection unit for aligning with the first connection unit. The power unit includes a bidirectional motor (12) fixedly connected to the base plate (1). A reciprocating screw (13) is fixedly connected to the output end of the bidirectional motor (12). A 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 limit rod (15) is fixedly connected between the bidirectional motor (12) and the first connecting plate (14). A reciprocating slider (16) is sleeved on the outside of the reciprocating screw (13). The limit rod (15) passes through the reciprocating slider (16). The side of the reciprocating slider (16) is fixedly connected to the moving plate (6) through a first connecting block (17). 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). The second connecting plates (18) are provided with a plurality of first through grooves (19). A guide protrusion (20) is provided in the first through groove (19). A first moving block (21) is slidably connected in the first through groove (19). A connecting outer tube (22) is fixedly connected to the first moving block (21). The first moving block (21) is a hollow structure. The end of the first moving block (21) is flush with the liquid inlet (4) and the air inlet (5). The second connecting unit includes multiple third connecting plates (24). The third connecting plates (24) are fixedly connected to the movable plate (6) via a first connecting rod (25). A first through groove (19) is also provided on the third connecting plate (24). A guide protrusion (20) is provided in the first through groove (19). A first moving block (21) is slidably connected in the first through groove (19). A connecting inner tube (26) is inserted into the first moving block (21). The connecting inner tube (26) is connected to the movable plate (6) via a connecting hose (27). The inner connecting tube (26) and the outer connecting tube (22) are equipped with disengagement units; The disengagement unit includes a fourth connecting plate (28) fixedly connected to one end of the connecting inner tube (26). The fourth connecting plate (28) is connected to the third connecting plate (24) through a first spring (29) for providing elastic force. The first spring (29) is sleeved on the outside of the connecting inner tube (26). A second moving block (30) is inserted into the connecting inner tube (26). A third moving block (31) is fixedly connected to one side of the second moving block (30). A first inclined surface (32) is provided on the third moving block (31). A symmetrically arranged snap-fit ​​protrusion (33) is fixedly connected to the other side of the second moving block (30). A second connecting block (34) is fixedly connected to the connecting outer tube (22). A moving groove (35) that cooperates with the snap-fit ​​protrusion (33) is opened in the second connecting block (34).

2. The pressure resistance performance testing device for a thermal management integrated valve as described in claim 1, characterized in that, The first movable block (21) is fixedly connected with a limiting rubber protrusion (23) that cooperates with the liquid inlet end (4) and the air inlet end (5).

3. The pressure resistance performance testing device for a thermal management integrated valve as described in claim 1, characterized in that, A magnetic plate (36) is fixedly connected to the outside of the inner tube (26), and the magnetic plate (36) is magnetically connected to the movable plate (6).

4. The pressure resistance performance testing device for a thermal management integrated valve as described in claim 1, 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).

5. The pressure resistance performance testing device for a thermal management integrated valve as described in claim 4, characterized in that, The limiting unit includes a first pressing plate (38), a pressing rod (39) is fixedly connected to the upper end of the first pressing plate (38), a second through groove (40) is provided on the placement plate (3), a pressing block (41) is fixedly connected to the upper end of the pressing rod (39), a second inclined surface (42) is provided on the pressing block (41), a connecting ring (43) is fixedly connected to the outer side of the connecting inner tube (26), a second connecting rod (44) is fixedly connected to the upper end of the connecting ring (43), the second connecting rod (44) is fixedly connected to the second pressing plate (45), and the upper end of the first pressing plate (38) is connected to the moving plate (6) through a second spring (46) for providing elastic force.

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