CN214043764U - Hard shell battery formation device - Google Patents

Abstract

The utility model belongs to the field of formation machinery, in particular to a hard shell battery formation device, which comprises a base, a battery clamp, a support frame, an electricity connection mechanism and a lifting mechanism, wherein the battery clamp is arranged on the base, the electricity connection mechanism is arranged on the support frame and positioned above the battery clamp, the lifting mechanism drives the battery clamp to ascend or drives the electricity connection mechanism to descend, so that the electricity connection mechanism is connected with a battery clamped in the battery clamp; the battery clamp comprises a frame body and at least one group of clamping mechanisms arranged in the frame body, wherein each clamping mechanism comprises two groups of guide rod groups arranged in the frame body in parallel, a plurality of groups of laminated plates connected with the guide rod groups in a sliding mode, and a pressing mechanism arranged on the frame body and used for pushing the laminated plates, and a battery clamping position is formed between every two adjacent laminated plates and used for positioning a battery. The battery is compressed by the compressing mechanism, so that the deformation caused by overlarge internal pressure of the battery is avoided, and the quality of the battery is ensured.

Description

Hard shell battery formation device

Technical Field

The utility model belongs to the technical field of the battery ization becomes equipment, especially, relate to a crust battery ization becomes device.

Background

The aluminum-shell battery is a new energy battery which is commonly used at present, and the usage amount is huge. In the production process of the aluminum-shell battery, the aluminum-shell battery needs to be finished by processing technologies such as liquid injection, formation, capacity grading and the like. The aluminum shell battery is positioned in the clamp in the formation process, and is electrified through the power connection device to realize formation. Chinese patent literature, publication number is: CN108598579A discloses a battery vacuum formation mechanism, which specifically discloses: the battery positioning assembly comprises a lower positioning plate, a support column and an upper positioning plate, wherein four support columns are symmetrically arranged on the lower positioning plate, the upper positioning plate is arranged on the support column, and positioning grooves are formed in the upper positioning plate and the lower positioning plate. Therefore, during formation, the battery is positioned in the positioning groove. In the actual formation process, gas is formed inside the battery through chemical reaction, so that the gas pressure inside the battery is too high, and the battery is prone to outward expansion and deformation.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a crust battery becomes device aims at solving current crust battery and becomes the problem of deformation.

In order to achieve the above object, an embodiment of the present invention provides a hard shell battery formation device, which includes a base, a battery clamp, a support frame, a power connection mechanism and a lifting mechanism, wherein the battery clamp is disposed on the base, the power connection mechanism is disposed on the support frame and above the battery clamp, the lifting mechanism drives the battery clamp to ascend, or drives the power connection mechanism to descend, so that the power connection mechanism connects a battery clamped in the battery clamp with the power connection mechanism; the battery clamp comprises a frame body and at least one group of clamping mechanisms arranged in the frame body, wherein each clamping mechanism comprises two groups of guide rod groups arranged in the frame body in parallel, a plurality of groups of laminated plates connected with the two groups of guide rod groups in a sliding mode, and a pressing mechanism arranged on the frame body and used for pushing the laminated plates, and a battery clamping position is formed between every two adjacent laminated plates and used for positioning a battery.

Furthermore, the laminated board comprises two connecting pieces and a pressing board, the connecting pieces are connected with the corresponding guide rod groups in a sliding mode, mounting grooves are formed in the opposite sides of the two connecting pieces, and the two ends of the pressing board are arranged in the corresponding mounting grooves in a sliding mode.

Further, a battery positioning frame is arranged on the same side of each laminated board, the top of each positioning frame and the side face facing the adjacent laminated board are both of an opening structure, and the thickness of each battery positioning frame is smaller than that of a battery.

Further, the pressing mechanism comprises a nut, a screw rod, a push plate and a plurality of groups of pressure maintaining springs; the push plate is connected with the two guide rod groups in a sliding mode, one side of the frame body is provided with a mounting hole, and the nut is arranged in the mounting hole; the screw rod passes the nut, and with the push pedal rotates to be connected, the multiunit pressurize spring is located one side of push pedal, and with adjacent the lamination board butt.

Furthermore, the number of the clamping mechanisms arranged in the frame body is two.

Further, the bottom of the frame body is also provided with a plurality of heat dissipation holes for ventilating and dissipating heat of the battery.

Further, the lifting mechanism is arranged on the base, and the battery clamp is arranged at the lifting end of the lifting mechanism.

Further, the power connection mechanism comprises two groups of power connection assemblies with the same structure and used for connecting the positive electrode and the negative electrode of the battery; the electric connection assembly comprises an installation frame body, a plurality of groups of elastic electric connection pieces and elastic probes; the mounting frame body is arranged on the bottom wall of the support frame, and the multiple groups of elastic electric connection pieces are arranged at the bottom of the mounting frame body in parallel and are electrically connected with the formation power supply; each elastic probe is arranged in the corresponding elastic connecting piece, and the lower end of each elastic probe extends out of the corresponding elastic connecting piece.

Further, the elastic electric connection piece comprises a guide sleeve, a conductive telescopic piece and a compression spring; the utility model discloses a portable electronic device, including installation framework, conducting extensible member, compression spring cover, elastic probe, guide sleeve is located on the installation framework, the gliding passing of conducting extensible member the guide sleeve, the upper end and the lower extreme of conducting extensible member all are provided with spacing portion, compression spring cover establish with the lower extreme of conducting extensible member, elastic probe set up in the conducting extensible member.

In that step, the upper end of each conductive telescopic part is connected with a conductive sheet, the mounting frame body is internally provided with a fixed strip, and the upper end of the conductive sheet is fixed on the fixed strip.

Furthermore, a plurality of partition plates are further arranged in the installation frame body, limiting grooves are formed in the partition plates, and the limiting grooves are used for limiting power lines of the elastic electric connection pieces and the formation power supply.

Further, the bottom of support frame still is provided with the guide rail, two the installation framework with guide rail sliding connection, still be equipped with on the support frame and be used for adjusting two the electronic lead screw mechanism of installation framework position.

Furthermore, a negative pressure air exhaust mechanism is arranged between the two installation frame bodies and used for exhausting gas formed in the battery container.

Further, the negative pressure air exhaust mechanism comprises a connecting seat, a limiting plate, a plurality of air exhaust pipes and a second compression spring; the connecting seat is arranged at the upper end of one side of the mounting frame body; connecting parts extend downwards from two sides of the connecting seat, and the limiting plate is connected with the two connecting parts; a plurality of step holes are formed in the connecting seat, a plurality of pipe joints are arranged on the connecting seat, and the pipe joints are communicated with the corresponding step holes; the air exhaust pipe penetrates through the corresponding stepped hole and the corresponding limiting plate, the upper end of the air exhaust pipe is located in the stepped hole, and a sealing plate for sealing the stepped hole is arranged at the top of the connecting seat; the exhaust pipe is provided with a second limiting part, and the second compression spring is sleeved on the corresponding exhaust pipe, and the lower end of the second compression spring is limited on the second limiting part.

The embodiment of the utility model provides an above-mentioned one or more technical scheme in the duricrust battery ization becomes device has following technological effect at least:

1. when the battery is formed, each aluminum shell battery is clamped in the corresponding battery clamping position, the pressing plate is pushed by the pressing mechanism to clamp the battery, the lifting mechanism drives the battery clamp to ascend, or the electric connection mechanism is pushed to descend, so that the electric connection mechanism is in contact conduction with the positive electrode and the negative electrode of the battery, therefore, when the battery is formed, the battery is pressed by the pressing mechanism, the phenomenon that the internal pressure of the battery is too large and the battery deforms is avoided, and the quality of the battery is guaranteed.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.

Fig. 1 is a structural diagram of a hard-shell battery formation device according to an embodiment of the present invention.

Fig. 2 is a structural diagram of the battery clamp of the hard-shell battery formation device according to the embodiment of the present invention.

Fig. 3 is a structural diagram of the laminated board of the hard-shell battery formation device provided by the embodiment of the invention.

Fig. 4 is a structural diagram of the power connection mechanism of the hard-shell battery formation device according to the embodiment of the present invention.

Fig. 5 is a front view of the power connection mechanism of the hard-shell battery formation device according to the embodiment of the present invention.

Fig. 6 is a structural diagram of the power connection assembly of the hard-shell battery formation device according to the embodiment of the present invention.

Fig. 7 is a structural diagram of the negative pressure pumping mechanism of the hard-shell battery formation device according to the embodiment of the present invention.

Fig. 8 is a reverse structure view of the negative pressure pumping mechanism of the hard-shell battery formation device provided by the embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary and intended to explain the embodiments of the present invention and are not to be construed as limiting the present invention.

In the description of the embodiments of the present invention, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings, which is only for convenience in describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element so indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as fixed or detachable connections or as an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the embodiments of the present invention can be understood by those skilled in the art according to specific situations.

In an embodiment of the present invention, referring to fig. 1 and 2, a hard-shell battery formation device includes a base 100, a battery clamp 200, a support frame 300, a power connection mechanism 400, and a lifting mechanism 500. The battery clamp 200 is disposed on the base 100, and the power connection mechanism 400 is disposed on the supporting frame 300 and above the battery clamp 200. The lifting mechanism 500 drives the battery clamp 200 to ascend, or drives the power connection mechanism 400 to descend, so that the power connection mechanism 400 is connected with a battery clamped in the battery clamp 200. The battery clamp 200 includes a frame 210 and at least one clamping mechanism disposed in the frame 210, where the clamping mechanism includes two guide rod sets 220 disposed in parallel in the frame 210, multiple laminated plates 230 slidably connecting the two guide rod sets 220, and a pressing mechanism 240 disposed on the frame 210 and used for pressing the laminated plates 230, and a battery clamping position is formed between adjacent laminated plates 230 and used for positioning a battery. In this embodiment, when the batteries need to be formed, each battery is positioned in a corresponding battery clamping position, and the pressing mechanism 240 pushes the laminate sheet 230 to press the batteries; the lifting structure 500 drives the battery clamp 200 to ascend, or drives the power connection mechanism 400 to descend, so that the power connection structure 400 is connected with the positive electrode and the negative electrode of the battery to be electrified, and then the battery is electrified and formed.

Further, the supporting frame 300 includes four supporting columns disposed on the base 100 and a fixing plate connected to the four supporting columns, and the power connection mechanism 400 is disposed at the bottom of the fixing plate.

Further, referring to fig. 3, the laminated board 230 includes two connecting members 231 and a pressing plate 232, the connecting members 231 are slidably connected to the corresponding guide bar sets 220, opposite sides of the two connecting members 231 are provided with mounting grooves 234, and both ends of the pressing plate 232 are slidably disposed in the corresponding mounting grooves 234. In this embodiment, the pressing plate 232 is connected to the two connecting members 231, and the two connecting members 231 are connected to the guide rod set 220, so that the structure of the laminated plate 230 of this embodiment is simple, and when the laminated plate 230 is replaced, only the pressing plate 232 needs to be taken out for replacement, so that the replacement is convenient, and the replacement cost is reduced.

Further, referring to fig. 2 and 3, a battery positioning frame 235 is disposed on the same side of each of the laminated plates 230, the top of the positioning frame 235 and the side facing the adjacent laminated plate 230 are both in an open structure, and the thickness of the battery positioning frame 235 is smaller than that of the battery. In this embodiment, when the battery is clamped in the battery clamp 200, the battery is positioned by the positioning frame 235, so that when the power connection mechanism 400 is connected with the battery, the positive electrode and the negative electrode of the battery can be accurately connected with the power connection mechanism 400. Further, the battery clamp 200 of the present embodiment can replace different positioning frames 235, so as to clamp batteries of different types.

Further, referring to fig. 2, the pressing mechanism 240 includes a nut 241, a screw 242, a push plate 243, and a plurality of sets of pressure maintaining springs 244; the push plate 243 is slidably connected to the two guide rod sets 220, a mounting hole (not shown) is formed in one side of the frame 210, and the nut 241 is disposed in the mounting hole; the screw 242 passes through the nut 241 and is rotatably connected to the push plate 243, and the plurality of sets of pressure maintaining springs 244 are disposed on one side of the push plate 243 and abut against the adjacent laminate 230. This embodiment, when compressing tightly the battery, through screw rod 242 and nut 241 cooperation, and then promote the push pedal 243 and remove, reach and compress tightly the battery to when the battery compresses tightly, pressurize spring 244 is compressed, reaches the effect of pressurize, when the formation, when the inside atmospheric pressure of battery rises when too high, makes battery case warp, and then compression pressurize spring 244 can prevent the too big and problem of exploding of battery internal pressure.

Further, the number of the clamping mechanisms provided in the frame 210 is two. Therefore, two groups of batteries can be clamped simultaneously to form the battery pack, and the formation efficiency is improved.

Further, the bottom of the frame 210 is further provided with a plurality of heat dissipation holes for ventilating and dissipating heat of the battery.

Further, the lifting mechanism 500 is disposed on the base 100, and the battery clamp 200 is disposed at a lifting end of the lifting mechanism 500. In this embodiment, the battery clamp 200 is pushed to ascend by the lifting mechanism 500, so as to connect the battery with electricity. The lifting mechanism 500 is an electric screw mechanism.

Further, referring to fig. 4 and 5, the power connection mechanism 400 includes two sets of power connection components with the same structure for connecting the positive electrode and the negative electrode of the battery. The electrical connection assembly includes a mounting frame 410, a plurality of sets of elastic electrical connection members 420 and elastic probes 430. The mounting frame body 410 is disposed on the bottom wall of the supporting frame 300, and the plurality of sets of elastic electrical connection members 420 are disposed in parallel on the bottom of the mounting frame body 410 and electrically connected to the formation power source. Each elastic probe 430 is arranged in the corresponding elastic electric connection piece 420, and the lower end of each elastic probe 430 extends out of the corresponding elastic electric connection piece 420. In this embodiment, when the power connection mechanism 400 connects the battery, the power connection mechanism is pressed against the top of the corresponding electrode, so as to connect the battery. And the elastic probe 430 is electrically connected with a voltage detection device of the formation power supply, so that the formation voltage is detected in the process of battery formation, and the quality of the battery formation is further ensured.

Further, referring to fig. 6, the elastic electric connection member 420 includes a guide sleeve 421, a conductive expansion member 422 and a compression spring 423; the guide sleeve 421 is arranged on the installation frame body 410, the conductive extensible member 422 penetrates through the guide sleeve 421 in a sliding manner, the upper end and the lower end of the conductive extensible member 422 are both provided with limiting parts, the compression spring 423 is sleeved on the lower end of the conductive extensible member 422, and the elastic probe 430 is arranged in the conductive extensible member 422. In this embodiment, when the power connection structure 400 is connected to the battery electrode, the conductive expansion piece 422 is in contact with the electrode of the battery, and the compression spring 423 is compressed, so that each conductive expansion piece 422 can be in contact with the corresponding battery electrode, and it is ensured that the power connection of each battery is stable in the formation process.

In this step, referring to fig. 6, a conductive sheet 424 is connected to an upper end of each of the conductive telescopic members 422, the mounting frame 410 is disposed in a fixing bar 425, and an upper end of the conductive sheet 424 is fixed to the fixing bar 425. Therefore, the upper end of the conductive sheet can be connected with the power line, and the electric wire is prevented from pulling the conductive telescopic piece 422, so that the conductive telescopic piece 422 is prevented from being separated from the electrode of the battery.

Further, a plurality of partition plates 411 are further arranged in the installation frame body 410, a limiting groove 412 is arranged on each partition plate 411, and the limiting groove 412 is used for limiting a power line of the elastic electric connection piece 420 connected with a formation power supply. In this embodiment, through spacing groove 412 to the electric wire spacing with arrange in order, avoid the electric wire confusion.

Further, the bottom of the support frame 300 is further provided with a guide rail 310, the two mounting frame bodies 410 are slidably connected with the guide rail 310, and the support frame 300 is further provided with an electric screw rod mechanism 500 for adjusting the positions of the two mounting frame bodies 410. In this embodiment, the position of the corresponding mounting frame 410 can be adjusted by the electric lead screw mechanism 500, so that the power connection mechanism 400 can meet the requirements of formation of batteries of different types.

Specifically, each of the mounting frames 410 is connected to at least one set of electric screw mechanisms 500, so that each of the mounting frames 410 can be independently adjusted.

Further, referring to fig. 4 and 5, a negative pressure pumping mechanism 600 is further disposed between the two mounting frames 410 for exhausting the gas formed by the formation in the battery. In this embodiment, when the battery is electrified and formed, the negative pressure air exhaust mechanism 600 is communicated with the air exhaust hole of the battery, so that in the forming process, harmful gas generated inside the battery is exhausted through the negative pressure air exhaust mechanism 600, the pressure inside the battery can be effectively reduced, and the battery is protected.

Further, referring to fig. 7 and 8, the negative pressure pumping mechanism 600 includes a connecting seat 601, a limiting plate 602, a plurality of pumping tubes 603 and a second compression spring 604. The connecting seat 601 is disposed at an upper end of one side of the mounting frame 410. The two sides of the connecting seat 601 extend downwards to form connecting parts 605, and the limiting plate 602 connects the two connecting parts 605. A plurality of step holes (not shown in the drawing) are formed in the connecting base 601, a plurality of pipe joints 606 are formed in the connecting base 601, the pipe joints 606 are communicated with the corresponding step holes, and the pipe joints 606 are connected with a negative pressure mechanism pipeline. The air exhaust pipe 603 penetrates through the corresponding stepped hole and the limiting plate 602, the upper end of the air exhaust pipe 603 is located in the stepped hole, and a sealing plate 607 for sealing the stepped hole is arranged at the top of the connecting seat 601; the exhaust tube 603 is provided with a second limiting member 608, and the second compression spring 604 is sleeved on the corresponding exhaust tube 603, and the lower end of the second compression spring is limited on the second limiting member 608. In this embodiment, the lower end of the gas exhaust pipe 603 is sealed to the opening of the gas exhaust hole of the battery during the formation of the battery, so that the gas in the battery can be exhausted during the formation.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (14)

1. A hard shell battery formation device comprises a base, a battery clamp, a support frame, a power connection mechanism and a lifting mechanism, wherein the battery clamp is arranged on the base, the power connection mechanism is arranged on the support frame and positioned above the battery clamp, the lifting mechanism drives the battery clamp to ascend or drives the power connection mechanism to descend, so that the power connection mechanism is connected with a battery clamped in the battery clamp; the battery clamp is characterized by comprising a frame body and at least one group of clamping mechanisms arranged in the frame body, wherein each clamping mechanism comprises two groups of guide rod groups arranged in the frame body in parallel, a plurality of groups of laminated plates connected with the two groups of guide rod groups in a sliding mode, and a pressing mechanism arranged on the frame body and used for pushing the laminated plates, and a battery clamping position is formed between every two adjacent laminated plates and used for positioning a battery.

2. The hard-shell battery formation device of claim 1, wherein: the laminated board comprises two connecting pieces and a pressing board, the connecting pieces are connected with the corresponding guide rod groups in a sliding mode, mounting grooves are formed in the opposite sides of the two connecting pieces, and the two ends of the pressing board are arranged in the corresponding mounting grooves in a sliding mode.

3. The hard-shell battery formation device of claim 1 or 2, wherein: the battery positioning frames are arranged on the same side of each laminated board, the tops of the positioning frames and the side faces, facing the adjacent laminated boards, of the positioning frames are both of an open structure, and the thickness of each battery positioning frame is smaller than that of each battery.

4. The hard-shell battery formation device according to claim 1 or 2, wherein the pressing mechanism comprises a nut, a screw, a push plate and a plurality of sets of pressure maintaining springs; the push plate is connected with the two guide rod groups in a sliding mode, one side of the frame body is provided with a mounting hole, and the nut is arranged in the mounting hole; the screw rod passes the nut, and with the push pedal rotates to be connected, the multiunit pressurize spring is located one side of push pedal, and with adjacent the lamination board butt.

5. The hard-shell battery formation device of claim 1, wherein: the number of the clamping mechanisms arranged in the frame body is two.

6. The hard-shell battery formation device of claim 1, wherein: the bottom of the frame body is also provided with a plurality of heat dissipation holes for ventilating and dissipating heat of the battery.

7. The hard-shell battery formation device of claim 1, wherein: the lifting mechanism is arranged on the base, and the battery clamp is arranged at the lifting end of the lifting mechanism.

8. The hard-shell battery formation device of claim 1, wherein: the power connection mechanism comprises two groups of power connection assemblies with the same structure and is used for connecting the positive electrode and the negative electrode of the battery; the electric connection assembly comprises an installation frame body, a plurality of groups of elastic electric connection pieces and elastic probes; the mounting frame body is arranged on the bottom wall of the support frame, and the multiple groups of elastic electric connection pieces are arranged at the bottom of the mounting frame body in parallel and are electrically connected with the formation power supply; each elastic probe is arranged in the corresponding elastic connecting piece, and the lower end of each elastic probe extends out of the corresponding elastic connecting piece.

9. The hard-shell battery formation device of claim 8, wherein: the elastic electric connection piece comprises a guide sleeve, a conductive telescopic piece and a compression spring; the utility model discloses a portable electronic device, including installation framework, conducting extensible member, compression spring cover, elastic probe, guide sleeve is located on the installation framework, the gliding passing of conducting extensible member the guide sleeve, the upper end and the lower extreme of conducting extensible member all are provided with spacing portion, compression spring cover establish with the lower extreme of conducting extensible member, elastic probe set up in the conducting extensible member.

10. The hard-shell battery formation device of claim 9, wherein: the upper end of each conductive telescopic piece is connected with a conductive sheet, the mounting frame body is internally provided with a fixed strip, and the upper end of each conductive sheet is fixed on the fixed strip.

11. The hard-shell battery formation device of claim 9, wherein: the mounting frame is characterized in that a plurality of partition plates are further arranged in the mounting frame, limiting grooves are formed in the partition plates, and the limiting grooves are used for limiting power lines of the elastic electric connection pieces and the formation power supply.

12. The hard-shell battery formation device of claim 8, wherein: the bottom of support frame still is provided with the guide rail, two the installation framework with guide rail sliding connection, still be equipped with on the support frame and be used for adjusting two the electric screw rod mechanism of installation framework position.

13. The hard-shell battery formation device according to any one of claims 8 to 12, characterized in that: and a negative pressure air exhaust mechanism is also arranged between the two installation frame bodies and used for exhausting gas formed by formation in the battery.

14. The hard-shell battery formation device of claim 13, wherein: the negative pressure air exhaust mechanism comprises a connecting seat, a limiting plate, a plurality of air exhaust pipes and a second compression spring; the connecting seat is arranged at the upper end of one side of the mounting frame body; connecting parts extend downwards from two sides of the connecting seat, and the limiting plate is connected with the two connecting parts; a plurality of step holes are formed in the connecting seat, a plurality of pipe joints are arranged on the connecting seat, and the pipe joints are communicated with the corresponding step holes; the air exhaust pipe penetrates through the corresponding stepped hole and the corresponding limiting plate, the upper end of the air exhaust pipe is located in the stepped hole, and a sealing plate for sealing the stepped hole is arranged at the top of the connecting seat; the exhaust pipe is provided with a second limiting part, and the second compression spring is sleeved on the corresponding exhaust pipe, and the lower end of the second compression spring is limited on the second limiting part.

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