Sealing structure of immersed liquid cooling cabinet

Abstract

The invention discloses a sealing structure of an immersed liquid cooling cabinet, and relates to the field of cold liquid cabinet sealing, the sealing structure comprises a connecting structure hanging plate, one end face of the connecting structure hanging plate far away from the cabinet is provided with an upper connecting sealing connecting structure and a lower connecting sealing connecting structure which are separable; the upper connection sealing connection structure and the lower connection sealing connection structure are detachably connected with the end face, away from the cabinet, of the connection structure hanging plate. The sealing structure is used for limiting and fixing the cable which is routed and enters the cabinet, and sealing the cable passing through the sealing structure and the joint, so that the volatilization of cooling liquid in the cabinet can be greatly reduced; moreover, through the designed sealing structure, the cable entering the cabinet can be detachably and quickly mounted, connected, limited and sealed, and different cables can be adapted to be in tight contact with the cable, so that the effect of sealing connection between the cable and the cabinet is achieved.

Description

Technical Field

[0001] The invention relates to the field of sealing and fixing of a cold liquid cabinet, and in particular to a sealing structure of an immersion liquid cooling cabinet. Background Art

[0002] As data centers move toward high power, high density, and ultra-large scale, conventional air cooling technology can no longer meet the ultra-high heat dissipation requirements of data centers. In order to ensure the working stability and reliability of data center equipment and reduce the energy consumption of the cooling system, the research and development and optimization of efficient thermal management and heat dissipation technology have become key links in data center system design. Against this background of development, liquid cooling technology has attracted much attention in the industry. Immersion liquid cooling is a cooling technology that immerses heat-generating equipment in insulating coolant and directly removes the heat generated by the equipment through the circulation of coolant. Compared with air cooling, immersion liquid cooling technology has many advantages, such as greatly reducing the thermal resistance of heat transfer and improving the heat dissipation capacity of high heat flux density equipment.

[0003] If the liquid cooling system is not well sealed during use, the coolant will evaporate, resulting in a reduction in coolant, which requires timely refilling, otherwise it will affect the heat dissipation of the system. However, the liquid cooling system needs to connect cables, and there are often large gaps in the cable routing path. In general cabinets, there is no seal on the routing path, but the size of the opening is minimized. However, due to the different thicknesses and numbers of cables, the size of the opening is difficult to guarantee, so the opening can only be made as large as possible, resulting in a certain gap between the cable and the opening, affecting the cooling effect of the liquid cooling system in the cabinet. Summary of the invention

[0004] The objective of the present invention is achieved through the following technical solutions: A sealing structure of an immersion liquid cooling cabinet, comprising a connecting structure hanging plate for installation and connection to the cabinet, wherein an end surface of the connecting structure hanging plate away from the cabinet is provided with a detachable upper connecting sealing connection structure and a lower connecting sealing connection structure, wherein the upper connecting sealing connection structure and the lower connecting sealing connection structure are respectively detachably connected to an end surface of the connecting structure hanging plate away from the cabinet; The upper connection sealing connection structure comprises an upper connection sealing connection seat, and the upper connection sealing connection seat is provided with a plurality of upper sealing rubber semi-cylindrical holes which can be retracted; The lower connection sealing connection structure comprises a lower connection sealing connection seat, and the lower connection sealing connection seat is provided with a plurality of lower sealing rubber semi-cylindrical holes which can be retracted; The upper sealing rubber semi-cylindrical hole and the lower sealing rubber semi-cylindrical hole are relatively closed and in close contact with each other, so as to limit and seal the cables passing through the upper sealing rubber semi-cylindrical hole and the lower sealing rubber semi-cylindrical hole.

[0005] Preferably, the lower sealing rubber semi-cylindrical hole and the semi-cylindrical cavity of the lower sealing rubber semi-cylindrical hole are both made of a stretchable and deformable sealing rubber ring; The end of the stretchable and deformable sealing rubber ring away from the inner wall of the semi-cylindrical cavity is connected in sequence through a plurality of hollow hexagonal expansion and stretch rubber cylinders, and is connected to the connection sealing connection seat through the plurality of expansion and stretch rubber cylinders connected in sequence.

[0006] Preferably, upper limit connection holes are respectively provided at both ends of the upper connection sealing connection seat, and the upper limit connection holes are used to penetrate the upper limit rod, and the upper limit rod is connected and fixed to the connection structure hanging plate; The upper connection sealing connection seat is detachably connected to the connection structure hanging plate through the connection bolts on the upper limit rod.

[0007] Preferably, both ends of the lower connection sealing connection seat are respectively provided with lower limit connection holes, and the lower limit connection holes are used to penetrate the lower limit rod, and the lower limit rod is connected and fixed to the connection structure hanging plate; The lower connection sealing connection seat is detachably connected to the connection structure hanging plate through the connection bolts on the lower limit rod.

[0008] Preferably, friction limit blocks for friction limit are respectively connected to both sides of one end of the upper connection sealing connection seat close to the lower connection sealing connection seat; The lower connection sealing connection seat is provided with friction limit grooves corresponding to the friction limit blocks on both sides of one end close to the upper connection sealing connection seat; The friction limiting block is placed in the friction limiting groove, and the friction limiting block is limited in the friction limiting groove by the friction limiting piece.

[0009] Preferably, the friction limiting member comprises a limiting friction plate, and the limiting friction plate is movably arranged in the friction limiting groove; One end surface of the limiting friction plate is used for friction contact and limiting with the friction limiting block, and the other end surface of the limiting friction plate is elastically connected to the bottom end surface of the friction limiting groove provided in the lower connecting sealing connection seat through an elastic connecting piece.

[0010] Preferably, the elastic connecting member comprises a movable guide pin shaft symmetrically arranged on the bottom end surface of the friction limiting groove opened on the limiting friction plate near the lower connecting sealing connecting seat; One end of the movable guide pin is connected and fixed to the limiting friction plate, and the other end of the movable guide pin is movably inserted into the bottom end surface of the friction limiting groove provided in the lower connecting sealing connection seat; Deformation springs are respectively sleeved on the movable guide pins; One end of the deformation spring is used to be connected to the limiting friction plate, and the other end of the deformation spring is used to be connected to the bottom end surface of the friction limiting groove.

[0011] Preferably, a limiting structure for limiting the contact between the limiting friction plate and the friction limiting block can be movably provided in the friction limiting groove; The limiting structure comprises a limiting head, one end of which is connected to a movable rod, the other end of which can movably pass through a movable hole provided on the side wall of the friction limiting groove and the end is connected to a movable connecting head.

[0012] Preferably, a connecting spring is provided on the movable rod, and the connecting spring is elastically arranged in the movable hole; One end of the connecting spring is used to be connected to the limiting head, and the other end of the connecting spring is used to be connected to the inner wall of the movable hole.

[0013] The beneficial effects of the present invention are as follows: the purpose of the present invention is to provide a sealing structure of an immersion liquid-cooled cabinet, which is used to be installed and connected to the side wall of the cabinet and is used for cables to pass through and enter the cabinet. By using the sealing structure to limit and fix the cables that are routed and enter the cabinet, the cables passing through the sealing structure and the connection are sealed, thereby greatly reducing the volatilization of the coolant in the cabinet; and, through the sealing structure of this design, it is also possible to achieve a detachable and quick installation connection limit seal for routing cables entering the cabinet, and to adapt to different cables to make close contact with them, thereby achieving a sealed connection effect between the two. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall connection effect of a sealing structure of an immersion liquid cooling cabinet of the present invention; Figure 2 It is an exploded schematic diagram of the connection structure part of the sealing structure of an immersion liquid cooling cabinet of the present invention; Figure 3 It is a schematic diagram of the connection of the upper and lower sealing connection structures of the sealing structure of an immersion liquid cooling cabinet of the present invention; Figure 4 This is a schematic diagram of a stretchable and deformable sealing rubber ring structure of a sealing structure of an immersion liquid cooling cabinet of the present invention; Figure 5 It is a schematic AA cross-sectional view of a side surface of a stretchable and deformable sealing rubber ring of a sealing structure of an immersion liquid cooling cabinet of the present invention; Figure 6 It is a schematic diagram of the connection structure of the upper connection sealing connection seat of the sealing structure of an immersion liquid cooling cabinet of the present invention; Figure 7It is an exploded schematic diagram of a lower connection sealing connection seat connection structure portion of a sealing structure of an immersion liquid cooling cabinet of the present invention; Figure 8 The present invention is an immersion liquid cooling cabinet Figure 7 A local enlarged schematic diagram of point B in FIG. Fig. 9 The present invention is an immersion liquid cooling cabinet Figure 7 A partial enlarged exploded diagram of point B in the figure; In the figure, 1-connecting structure hanging plate, 2-upper connecting sealing connecting seat, 3-lower connecting sealing connecting seat, 4-stretchable deformable sealing rubber ring, 21-limiting friction plate, 31-friction limiting groove, 32-limiting friction plate, 33-movable guide pin shaft, 34-limiting head, 41-expanding stretching rubber cylinder, 331-deformation spring, 341-movable rod, 342-movable connecting head, 343-connecting spring. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0016] Example 1 like Figures 1 to 9 As shown, a sealing structure of an immersion liquid cooling cabinet is used to be installed and connected to the side wall of the cabinet and is used for cables to pass through and enter the cabinet. The sealing structure of this design includes a connecting structure hanging plate 1 used to be installed and connected to the cabinet, and a detachable upper connecting sealing connection structure and a lower connecting sealing connection structure are provided on one end face of the connecting structure hanging plate 1 away from the cabinet. The upper connecting sealing connection structure and the lower connecting sealing connection structure are respectively detachably connected to one end face of the connecting structure hanging plate 1 away from the cabinet. The connection structure hanging plate 1 is installed and connected to the cold liquid cabinet and is specially used for the position where the wiring cables enter the cabinet. The upper connection sealing connection structure and the lower connection sealing connection structure are first movably and adjustably installed on the connection structure hanging plate 1, and the wiring cables pass between the upper connection sealing connection structure and the lower connection sealing connection structure respectively. The upper connection sealing connection structure and the lower connection sealing connection structure are limitedly connected, so that the wiring cables passing between the upper connection sealing connection structure and the lower connection sealing connection structure are clamped and limited. In addition, the structures designed by the upper connection sealing connection structure and the lower connection sealing connection structure themselves can limit the wiring cables and make them in close contact, thereby achieving a sealing effect.

[0017] The upper connection sealing connection structure of the arrangement includes an upper connection sealing connection seat 2, which is provided with a plurality of retractable upper sealing rubber semi-cylindrical holes; the lower connection sealing connection structure includes a lower connection sealing connection seat 3, which is provided with a plurality of retractable lower sealing rubber semi-cylindrical holes; the upper sealing rubber semi-cylindrical holes and the lower sealing rubber semi-cylindrical holes are relatively closed and in close contact with each other, so as to limit and seal the cables passing between the upper sealing rubber semi-cylindrical holes and the lower sealing rubber semi-cylindrical holes.

[0018] Specifically: the lower sealing rubber semi-cylindrical hole and the semi-cylindrical cavity of the upper sealing rubber semi-cylindrical hole are both made of a stretchable and deformable sealing rubber ring 4; one end of the stretchable and deformable sealing rubber ring 4 away from the inner wall of the "sealing rubber semi-cylindrical hole" respectively opened by the upper connection sealing connection seat 2 and the lower connection sealing connection seat 3 is connected in sequence through a number of hollow hexagonal expansion stretch rubber cylinders 41, and the connection sealing connection seats respectively connected to each other by a number of expansion stretch rubber cylinders 41 connected in sequence are connected into one body. It should be noted that when the wiring cables are not passed through, the "holes" formed by the two sealing rubber semi-cylindrical holes respectively set opposite to each other and the holes opened corresponding to the connection structure hanging plate 1 into the liquid cooling cabinet are temporarily blocked with plugs to prevent the coolant in the cabinet from volatilizing and overflowing.

[0019] Example 2 The upper connection sealing connection seat 2 is provided with upper limit connection holes at both ends, and the upper limit connection holes are used to be inserted on the upper limit rod, and the upper limit rod is connected and fixed with the connection structure hanging plate 1; the upper connection sealing connection seat 2 is detachably connected with the connection structure hanging plate 1 through the connection bolts on the upper limit rod. The lower connection sealing connection seat 3 is provided with lower limit connection holes at both ends, and the lower limit connection holes are used to be inserted on the lower limit rod, and the lower limit rod is connected and fixed with the connection structure hanging plate 1; the lower connection sealing connection seat 3 is detachably connected with the connection structure hanging plate 1 through the connection bolts on the lower limit rod; and then the upper connection sealing connection seat 2 and the lower connection sealing connection seat 3 are temporarily installed on the connection structure hanging plate 1, and then the various wiring cables are respectively passed through the corresponding limit connection holes between the upper connection sealing connection seat 2 and the lower connection sealing connection seat 3 into the liquid cooling cabinet, and then the upper connection sealing connection seat 2 and the lower connection sealing connection seat 3 of the sealing structure are sealed and fixed.

[0020] In the embodiment, the upper sealing rubber semi-cylindrical hole and the lower sealing rubber semi-cylindrical hole used to limit the cables entering the liquid cooling cabinet are both made of "stretchable and deformable sealing rubber ring 4". The stretchable and deformable sealing rubber ring 4 is made of rubber with plastic elastic setting, and the "filling part structure" between the stretchable and deformable sealing rubber ring 4 and the connecting sealing connection seat (including the upper connecting sealing connection seat 2 and the lower connecting sealing connection seat 3) connected to each other is connected by an expansion stretch rubber cylinder 41. In this way, each "semi-cylindrical hole" used to limit the routing cable and the connecting sealing connection seat are elastically retractable in a "hexagonal structure". It should be noted here that the hexagonal structures connected in sequence are similar to the structure of a bee's nest, and are connected to form a structure. In this way, when the two stretchable and deformable sealing rubber rings 4 are relatively limited to the routing cables passing through them, even if the diameters of the routing cables are different, since the two stretchable and deformable sealing rubber rings 4 are connected by a plurality of expansion stretch rubber cylinders 41 that are elastically contracted and set through the center, the stretchable and deformable sealing rubber rings 4 can be "contracted and deformed" to adapt to the size of the routing cables according to the size of the routing cables, and the stretchable and deformable sealing rubber rings 4 are flexible structures made of plastic rubber materials, so they can elastically adapt to the size of the routing cables and can be well in contact with the outer wall of the routing cables, thereby reducing the gap between the routing cables and the upper sealing rubber semi-cylindrical hole opened by the upper connection sealing connection seat 2 and the lower sealing rubber semi-cylindrical hole opened by the lower connection sealing connection seat 3, thereby achieving a sealing effect. It should be noted here that the contact position of the connection seam between the upper connection sealing connection seat 2 and the lower connection sealing connection seat 3 is respectively through a sealing connection strip that can be tightly contacted, so that when the upper connection sealing connection seat 2 and the lower connection sealing connection seat 3 are in contact, the sealing connection strip is in close contact to seal the connection seam between the two.

[0021] Example 3 Friction limit blocks 21 for friction limiting are respectively connected on both sides of one end of the upper connection sealing connection seat 2 close to the lower connection sealing connection seat 3; friction limit grooves 31 corresponding to the friction limit blocks are respectively opened on both sides of one end of the lower connection sealing connection seat 3 close to the upper connection sealing connection seat 2; the friction limit block 21 is placed in the friction limit groove 31, and the friction limit block 21 is limited in the friction limit groove 31 by the friction limit member; the upper connection sealing connection seat 2 is connected close to the lower connection sealing connection seat 3 through friction force limiting, so that the two are "flexibly connected", thereby meeting the needs of adapting to different routing cables (the size of the gap at the contact position where the upper connection sealing connection seat 2 is close to the lower connection sealing connection seat 3).

[0022] At the same time, the friction limiter includes a limit friction plate 32, which is movably arranged in the friction limiter groove 31; one end face of the limit friction plate 21 is used for friction contact and limit with the friction limiter block 32, and the other end face of the limit friction plate 32 is elastically connected to the bottom end face of the friction limiter groove 31 opened in the lower connection sealing connection seat 3 through an elastic connection member. The elastic connection member includes a movable guide pin shaft 33 symmetrically arranged on the bottom end face of the friction limiter groove 31 opened in the limit friction plate 32 near the lower connection sealing connection seat 3; one end of the movable guide pin shaft 33 is connected and fixed to the limit friction plate 32, and the other end of the movable guide pin shaft 33 is movably arranged on the bottom end face of the friction limiter groove 31 opened in the lower connection sealing connection seat 3; and a deformation spring 331 is respectively sleeved on the movable guide pin shaft 33; one end of the deformation spring 331 is used to connect with the limit friction plate 32, and the other end of the deformation spring 331 is used to connect with the bottom end face of the friction limiter groove 31.

[0023] In addition, a limiting structure for limiting the contact between the limiting friction plate 32 and the friction limiting block 33 can be movably provided in the friction limiting groove 31. The limiting structure includes a limiting head 34, one end of which is connected to a movable rod 341, and the other end of the movable rod 341 can movably pass through a movable hole provided in the side wall of the friction limiting groove 31 and is connected to a movable connecting head 342. A connecting spring 343 is provided on the movable rod 341, and the connecting spring 343 is elastically provided in the movable hole; one end of the connecting spring 343 is used to be connected to the limiting head 34, and the other end of the connecting spring 343 is used to be connected to the inner wall of the movable hole.

[0024] In the embodiment, when it is necessary to further connect the upper connection sealing connection seat 2 and the lower connection sealing connection seat 3, the wiring cables passing through the lower sealing rubber semi-cylindrical holes corresponding to the upper connection sealing connection seat 2 and the lower connection sealing connection seat 3 are sealed and contacted, and the connection gap between the upper connection sealing connection seat 2 and the lower connection sealing connection seat 3 is reduced. The set limiting friction plates 21 are respectively aligned with the friction limiting grooves 31 opened on their respective sides, so that the limiting friction plates 21 are adapted to enter the friction limiting grooves 31. When the friction plate 21 is moved to the position of the limit head 34, the friction plate 21 continues to move toward the bottom end surface of the friction limit groove 31 under the external force, and the limit head 34 is subjected to the "downward push" of the friction plate 21, so that the limit head 34 compresses the connecting spring 343 under the movable guiding action of the movable rod 341, and the limit head 34 retreats into the movable hole, releasing the obstruction to the friction plate 21, allowing the friction plate 21 to continue to move downward and contact the friction limit block 33 set in the friction limit groove 31, and as the friction plate 21 continues to move downward, the friction limit block 33 compresses the deformation spring 331 under the movable guiding action of the movable guide pin 33; until the friction plate 21 passes through the bottom end of the movable hole, the limit head 34 is restored to the initial position under the restoring deformation force of the connecting spring 343. The locking cam 33 is in the form of a locking cam 36 which is secured to the locking cam 36 by the spring 32 which is in the locking cam 36. The locking cam 36 is secured to the locking cam 36 by the spring 32 which is in the locking cam 36. The locking cam 36 is secured to the locking cam 36 by the spring 32 which is in the locking cam 36. It should be noted here that when it is necessary to disassemble, separate or replace the sealing structure, loosen the connecting bolts used to limit the connection between the upper connection sealing connection seat 2 and the lower connection sealing connection seat 3, and then pull the movable connecting head 342 outward to allow the limiting head 34 to retreat to the movable hole, and push the upper connection sealing connection seat 2 outward from the connecting structure hanging plate 1 to allow the limiting friction plate 21 to leave the friction limiting groove 31, so that the upper connection sealing connection seat 2 and the lower connection sealing connection seat 3 are separated, thereby removing the upper connection sealing connection seat 2 and the lower connection sealing connection seat 3 respectively, and then operate according to needs.

[0025] From the perspective of the sealing structure design, the sealing structure is used to limit and fix the cables that are routed and enter the cabinet, and at the same time, the cables passing through the sealing structure and the connection are sealed, so that the volatilization of the coolant in the cabinet can be greatly reduced; and through the sealing structure of this design, it is also possible to achieve a detachable and quick installation connection to limit the sealing of the cables that are routed and enter the cabinet, and it can adapt to different cables to make close contact with them, so as to achieve the effect of a sealed connection between the two.

Claims

1. A sealing structure of an immersion liquid cooling cabinet, comprising a connecting structure hanging plate for installation and connection to the cabinet, characterized in that: The end surface of the connecting structure hanging plate away from the cabinet is provided with a detachable upper connecting sealing connection structure and a lower connecting sealing connection structure, and the upper connecting sealing connection structure and the lower connecting sealing connection structure are respectively detachably connected to the end surface of the connecting structure hanging plate away from the cabinet; The upper connection sealing connection structure comprises an upper connection sealing connection seat, and the upper connection sealing connection seat is provided with a plurality of upper sealing rubber semi-cylindrical holes which can be retracted; The lower connection sealing connection structure comprises a lower connection sealing connection seat, and the lower connection sealing connection seat is provided with a plurality of lower sealing rubber semi-cylindrical holes which can be retracted; The upper sealing rubber semi-cylindrical hole and the lower sealing rubber semi-cylindrical hole are relatively closed and in close contact with each other, so as to limit and seal the cables passing through the upper sealing rubber semi-cylindrical hole and the lower sealing rubber semi-cylindrical hole.

2. The sealing structure of an immersion liquid cooling cabinet according to claim 1, characterized in that: The lower sealing rubber semi-cylindrical hole and the semi-cylindrical cavity of the lower sealing rubber semi-cylindrical hole are both made by a stretchable and deformable sealing rubber ring; The end of the stretchable and deformable sealing rubber ring away from the inner wall of the semi-cylindrical cavity is connected in sequence through a plurality of hollow hexagonal expansion and stretch rubber cylinders, and is connected to the connection sealing connection seat through the plurality of expansion and stretch rubber cylinders connected in sequence.

3. The sealing structure of an immersion liquid cooling cabinet according to claim 2, characterized in that: The upper connection sealing connection seat is provided with upper limit connection holes at both ends, and the upper limit connection holes are used to penetrate the upper limit rod, and the upper limit rod is connected and fixed to the connection structure hanging plate; The upper connection sealing connection seat is detachably connected to the connection structure hanging plate through the connection bolts on the upper limit rod.

4. The sealing structure of an immersion liquid cooling cabinet according to claim 3, characterized in that: The two ends of the lower connection sealing connection seat are respectively provided with lower limit connection holes, and the lower limit connection holes are used to penetrate the lower limit rod, and the lower limit rod is connected and fixed to the connection structure hanging plate; The lower connection sealing connection seat is detachably connected to the connection structure hanging plate through the connection bolts on the lower limit rod.

5. The sealing structure of an immersion liquid cooling cabinet according to claim 4, characterized in that: The upper connection sealing connection seat is connected to friction limit blocks for friction limit at both sides of one end close to the lower connection sealing connection seat; The lower connection sealing connection seat is provided with friction limit grooves corresponding to the friction limit blocks on both sides of one end close to the upper connection sealing connection seat; The friction limiting block is placed in the friction limiting groove, and the friction limiting block is limited in the friction limiting groove by the friction limiting piece.

6. The sealing structure of an immersion liquid cooling cabinet according to claim 5, characterized in that: The friction limiting member comprises a limiting friction plate, and the limiting friction plate is movably arranged in the friction limiting groove; One end surface of the limiting friction plate is used for friction contact and limiting with the friction limiting block, and the other end surface of the limiting friction plate is elastically connected to the bottom end surface of the friction limiting groove provided in the lower connecting sealing connection seat through an elastic connecting piece.

7. The sealing structure of an immersion liquid cooling cabinet according to claim 6, characterized in that: The elastic connecting member comprises a movable guide pin shaft symmetrically arranged on the bottom end surface of the friction limiting groove of the limiting friction plate close to the lower connecting sealing connecting seat; One end of the movable guide pin is connected and fixed to the limiting friction plate, and the other end of the movable guide pin is movably inserted into the bottom end surface of the friction limiting groove provided in the lower connecting sealing connection seat; Deformation springs are respectively sleeved on the movable guide pins; One end of the deformation spring is used to be connected to the limiting friction plate, and the other end of the deformation spring is used to be connected to the bottom end surface of the friction limiting groove.

8. The sealing structure of an immersion liquid cooling cabinet according to claim 7, characterized in that: The friction limiting groove may also be movably provided with a limiting structure for limiting contact between the limiting friction plate and the friction limiting block; The limiting structure comprises a limiting head, one end of which is connected to a movable rod, the other end of which can movably pass through a movable hole provided on the side wall of the friction limiting groove and the end is connected to a movable connecting head.

9. The sealing structure of an immersion liquid cooling cabinet according to claim 8, characterized in that: A connecting spring is provided on the movable rod, and the connecting spring is elastically arranged in the movable hole; One end of the connecting spring is used to be connected to the limiting head, and the other end of the connecting spring is used to be connected to the inner wall of the movable hole.

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