An automobile sealing strip with a U-shaped skeleton structure

Abstract

The present invention relates to the technical field of automobile sealing strips, and discloses an automobile sealing strip with a U-shaped skeleton structure, comprising a rubber sealing layer, the interior of the rubber sealing layer is fixedly connected to a U-shaped supporting skeleton, the top of the rubber sealing layer is fixedly connected to a connecting layer, the top of the connecting layer is fixedly connected to a buffer bubble tube, the top of the buffer bubble tube is provided with a side exhaust hole, the interior of the side exhaust hole is fixedly connected to an exhaust mechanism, the middle part of the interior of the rubber sealing layer is fixedly connected to an upper clamping tooth, and the top of the upper clamping tooth is fixedly connected to a bonding mechanism; the present invention clamps the rubber sealing layer to the edge of an automobile sheet metal part so that the entire rubber sealing layer is in a semi-connected state with the edge of the sheet metal part, and then presses the rubber sealing layer again so that the rubber sealing layer is completely fitted with the edge of the sheet metal part, the upper clamping tooth is completely upward and fitted with the edge of the sheet metal part, and the glue in the glue film bag is squeezed out from the bag mouth to between the rubber sealing layer and the sheet metal part, so as to prevent the glue from drying up before bonding is performed.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile sealing strips, and more particularly to an automobile sealing strip with a U-shaped skeleton structure. Background Art

[0002] As a key component of the vehicle body sealing system, automotive sealing strips perform multiple functions in the automotive industry, including sound insulation and noise reduction, waterproofing and dustproofing, cushioning and shock absorption, and aerodynamic optimization. Traditional sealing strips are mostly made of a single rubber material or a simple composite structure. Their mechanical strength, durability, and assembly precision cannot meet the lightweight, long-life, and refined manufacturing requirements of modern vehicles. In particular, dynamic sealing areas such as doors, windows, and sunroofs require both excellent elastic recovery capabilities and the overall structure to maintain a stable sealing effect after long-term compression deformation.

[0003] To address this situation, a sealing strip structure using a thermoplastic elastomer metal-plastic composite framework is becoming increasingly popular. The framework in this sealing strip structure is usually made of galvanized steel, aluminum alloy, or engineering plastic with a U-shaped cross-section. It is compounded with rubber through a co-extrusion process to form a composite structure. After forming a composite structure, it can effectively wrap around the edge of the body sheet metal and provide a stable support base.

[0004] When using today's automotive sealing strips, they need to be clamped and fixed to the edges of sheet metal such as car doors or windows. In order to ensure that the two are sufficiently strong, glue is usually applied to the inside of the sealing strip or the edge of the sheet metal to increase the strength of the two by gluing. However, when applied to the inside of the sealing strip or the edge of the sheet metal, the glue is easy to solidify and dry in the air during installation, and the adhesive connection effect cannot be achieved. In addition, when connecting the skeleton inside the sealing strip and the external rubber sealing layer, the skeleton and the rubber sealing layer are prone to separation.

[0005] When the automobile sealing strip is in use, the sealing strip discharges gas through the gas holes on both sides of the bubble tube. At this time, the bubble tube is compressed and elastically deformed, thereby playing a buffering role. The gas is discharged from both sides at a slow speed, and the deformation will not be timely, which will make the buffering effect worse. If a lot of dust enters the sealing body, it will also have an adverse effect on the buffering performance of the sealing strip. Moreover, after multiple deformations, the bubble tube is prone to being unable to be reset. Summary of the Invention

[0006] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides an automobile sealing strip having a U-shaped skeleton structure to solve the technical problems raised in the background art.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solution: an automobile sealing strip with a U-shaped skeleton structure, comprising a rubber sealing layer, the interior of the rubber sealing layer is fixedly connected to a U-shaped supporting skeleton, the top of the rubber sealing layer is fixedly connected to a connecting layer, the top of the connecting layer is fixedly connected to a buffer bubble tube, the top of the buffer bubble tube is provided with a side exhaust hole, the interior of the side exhaust hole is fixedly connected to an exhaust mechanism, the interior of the buffer bubble tube is fixedly connected to a supporting mechanism, ventilation holes are provided on both sides of the buffer bubble tube, the bottom end of the interior of the rubber sealing layer is fixedly connected to a lower latching tooth, the middle portion of the interior of the rubber sealing layer is fixedly connected to an upper latching tooth, and the top of the upper latching tooth is fixedly connected to a bonding mechanism;

[0008] The bonding mechanism includes a glue film bag filled with glue, the top of the glue film bag is fixedly connected to the bag opening, the inside of the bag opening is glued with a bonding layer, and the bottom end of the glue film bag is fixedly connected to the top end of the upper clamping tooth.

[0009] In a preferred embodiment, a dustproof sponge is fixedly connected to the inside of the ventilation holes, the support mechanism and the exhaust mechanism are alternately distributed inside the buffer bubble tube, the U-shaped support skeleton is equidistantly distributed inside the rubber sealing layer, and the inner and outer surfaces of the U-shaped support skeleton are provided with concave and convex textures.

[0010] In a preferred embodiment, the support mechanism includes a fixed ball fixedly connected to the interior of the buffer bubble tube, and an elastic rod is fixedly connected to the side of the fixed ball. Four fixed balls and the elastic rod are combined into a group, and the fixed balls and the elastic rods in a group are arranged alternately.

[0011] In a preferred embodiment, a group of fixed marbles and elastic rods are combined into a regular quadrilateral, with a right angle between two adjacent elastic rods, and a group of fixed marbles and elastic rods are fixedly connected to the buffer bubble tube in a diamond shape inside the buffer bubble tube.

[0012] In a preferred embodiment, the exhaust mechanism includes a fixed cylinder located in the side exhaust hole and fixedly connected to the side exhaust hole, the top end of the inner side of the fixed cylinder is fixedly connected to the second support assembly, and the bottom end of the inner side of the fixed cylinder is fixedly connected to the sealing sponge.

[0013] In a preferred embodiment, the top of the sealing sponge is movably connected to a first support assembly, the side of the first support assembly is fixedly connected to the inner side of the fixed tube, the top of the first support assembly is movably connected to an exhaust valve, and the side of the exhaust valve is fixedly connected to the inside of the fixed tube.

[0014] In a preferred embodiment, the number of the exhaust valves is four, the four exhaust valves have the same shape, and the distance between the second support assembly and the exhaust valve is half the diameter of each exhaust valve, and the second support assembly has the same structure as the first support assembly.

[0015] In a preferred embodiment, the second supporting assembly includes an outer limiting cylinder fixedly connected to the inner side of the fixed cylinder, the inner side of the outer limiting cylinder is fixedly connected to a first connecting plate, the inner side of the first connecting plate is fixedly connected to a middle limiting cylinder, the inner side of the middle limiting cylinder is fixedly connected to a second connecting cylinder, and the inner side of the second connecting cylinder is fixedly connected to an inner limiting cylinder.

[0016] Technical effects and advantages of the present invention:

[0017] 1. The present invention clamps the rubber sealing layer to the edge of the automobile sheet metal. After the lower clamping teeth contact the edge of the sheet metal, the rubber sealing layer is in a semi-connected state with the edge of the sheet metal. The rubber sealing layer is then pressed again to completely fit the rubber sealing layer to the edge of the sheet metal. At this time, the upper clamping teeth rotate upward and fit the edge of the sheet metal. After the upper clamping teeth rotate, the glue in the glue film bag is squeezed out from the bag opening. At this time, the adhesive layer is separated from the bag opening, and the glue is squeezed from the bag opening to between the rubber sealing layer and the sheet metal, preventing the glue from drying up before bonding.

[0018] 2. When the present invention is performing buffering, the buffer bubble tube will be deformed. When the upper end and the side of the buffer bubble tube are squeezed and deformed, the elastic rod will be stretched vertically or laterally. After the squeezing is received, the stretched elastic rod will be reset, thereby driving the buffer bubble tube to reset, so that the buffer bubble tube can be quickly reset, ensuring that the buffer bubble tube can still be quickly reset after multiple deformations. The surface of the U-shaped support frame is provided with a concave and convex texture, which is better connected with the rubber sealing layer and is not easy to fall off from each other;

[0019] 3. When the buffer bubble tube of the present invention is squeezed and deformed for buffering, the gas in the buffer bubble tube can be discharged from both the ventilation hole and the side exhaust hole, thereby achieving rapid gas discharge and ensuring the buffering effect. When the gas is discharged from the inside of the exhaust mechanism in the side exhaust hole, the exhaust valve is bent upward during gas discharge, and the gas is discharged from the junction of the four exhaust valves. After discharge, the upward-bent exhaust valve is reset, and the bottom of the exhaust valve is supported by the first support assembly for sealing to prevent dust from entering. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0022] Figure 3 Schematic diagram of the internal structure of the rubber sealing layer of the present invention.

[0023] Figure 4 It is a schematic diagram of the U-shaped support frame structure of the present invention.

[0024] Figure 5 It is a schematic diagram of the overall structure of the bonding mechanism of the present invention.

[0025] Figure 6 It is a schematic diagram of the cross-sectional structure of the bonding mechanism of the present invention.

[0026] Figure 7 It is a schematic diagram of the support mechanism structure of the present invention.

[0027] Figure 8 It is a schematic diagram of the overall structure of the exhaust mechanism of the present invention.

[0028] Figure 9 It is a schematic diagram of the exploded structure of the exhaust mechanism of the present invention.

[0029] Figure 10 It is a schematic structural diagram of the first support assembly and the second support group of the present invention.

[0030] The accompanying drawings are marked as follows: 1. Rubber sealing layer; 2. U-shaped supporting frame; 3. Connecting layer; 4. Buffer bubble tube; 5. Side exhaust hole; 6. Exhaust mechanism; 601. Fixed cylinder; 602. Sealing sponge; 603. First supporting assembly; 604. Exhaust valve; 605. Second supporting assembly; 6051. Outer limiting cylinder; 6052. First connecting plate; 6053. Middle limiting cylinder; 6054. Second connecting cylinder; 6055. Inner limiting cylinder; 7. Support mechanism; 701. Fixed pintle; 702. Elastic rod; 8. Upper clamping tooth; 9. Bonding mechanism; 901. Glue film bag; 902. Bag opening; 903. Bonding layer; 10. Lower clamping tooth; 11. Ventilation hole; 12. Dust-proof sponge. DETAILED DESCRIPTION

[0031] The technical solutions of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The automotive sealing strip with a U-shaped skeleton structure involved in the present invention is not limited to the various structures described in the following embodiments. All other embodiments obtained by ordinary technicians in this field without making creative work fall within the scope of protection of the present invention.

[0032] Reference Figures 1-4The present invention provides an automobile sealing strip with a U-shaped skeleton structure, comprising a rubber sealing layer 1, wherein the interior of the rubber sealing layer 1 is fixedly connected to a U-shaped supporting skeleton 2, the top of the rubber sealing layer 1 is fixedly connected to a connecting layer 3, the top of the connecting layer 3 is fixedly connected to a buffer bubble tube 4, the top of the buffer bubble tube 4 is provided with a side exhaust hole 5, the interior of the side exhaust hole 5 is fixedly connected to an exhaust mechanism 6, the interior of the buffer bubble tube 4 is fixedly connected to a supporting mechanism 7, ventilation holes 11 are provided on both sides of the buffer bubble tube 4, the bottom end of the interior of the rubber sealing layer 1 is fixedly connected to a lower latch 10, the middle part of the interior of the rubber sealing layer 1 is fixedly connected to an upper latch 8, the top of the upper latch 8 is fixedly connected to a bonding mechanism 9, the interior of the ventilation holes 11 are fixedly connected to dustproof sponges 12, the supporting mechanism 7 and the exhaust mechanism 6 are alternately distributed inside the buffer bubble tube 4, the U-shaped supporting skeleton 2 is equidistantly distributed inside the rubber sealing layer 1, and the inner and outer surfaces of the U-shaped supporting skeleton 2 are provided with concave and convex textures.

[0033] In the embodiment of the present application, dust-proof sponges 12 are fixedly connected to the ventilation holes 11 on both sides of the buffer bubble tube 4. Therefore, when the buffer bubble tube 4 is deformed and inhaled, dust can be intercepted. The support mechanism 7 and the exhaust mechanism 6 are alternately distributed inside the buffer bubble tube 4, and their distribution is more uniform, which can achieve better exhaust and rebound support effects. The inner and outer surfaces of the U-shaped support frame 2 are provided with concave and convex textures, which are connected to the rubber sealing layer 1 through the concave and convex textures, so that the rubber sealing layer 1 is more tightly connected to the U-shaped support frame 2 and is not easily separated.

[0034] Reference Figure 5 and Figure 6 The bonding mechanism 9 includes a glue film bag 901 filled with glue, the top of the glue film bag 901 is fixedly connected to the bag opening 902, the inside of the bag opening 902 is glued with a bonding layer 903, and the bottom end of the glue film bag 901 is fixedly connected to the top of the upper tooth 8.

[0035] In the embodiment of the present application, when the upper latch 8 is twisted upward, the glue in the glue film bag 901 will be squeezed upward, and when the glue in the glue film bag 901 is squeezed to the bag opening 902, the bag opening 902 is separated from the adhesive layer 903, and the adhesive part between the bag opening 902 and the adhesive layer 903 is separated. The glue will be squeezed out from the top of the bag opening 902, and then flow into the rubber sealing layer 1 and the edge of the sheet metal, bonding the edge of the sheet metal and the rubber sealing layer 1, avoiding the glue from drying up easily when applying glue in advance, and avoiding sticking to non-preset positions due to operational errors when using double-sided tape for bonding.

[0036] Reference Figure 7The support mechanism 7 includes a fixed ball 701 fixedly connected to the inside of the buffer bubble tube 4, and an elastic rod 702 is fixedly connected to the side of the fixed ball 701. Four fixed balls 701 and the elastic rod 702 are combined into a group, and the fixed balls 701 and the elastic rod 702 in a group are arranged alternately. A group of fixed balls 701 and the elastic rod 702 are combined into a regular quadrilateral, and there is a right angle between two adjacent elastic rods 702. A group of fixed balls 701 and the elastic rod 702 are in a diamond shape inside the buffer bubble tube 4 and are fixedly connected to the buffer bubble tube 4.

[0037] In the embodiment of the present application, when the buffer bubble tube 4 is deformed and squeezed, when it is subjected to squeezing force in the vertical and horizontal directions, the angle between the two adjacent elastic rods 702 will become larger or smaller, and the elastic rods 702 will be squeezed and deformed. When the buffer bubble tube 4 is not subjected to squeezing force, the deformed elastic rods 702 will be reset, so that the buffer bubble tube 4 recovers faster and can be squeezed multiple times. When the buffer bubble tube 4 is not deformed, the elastic rods 702 can support the buffer bubble tube 4 to prevent the buffer bubble tube 4 from failing to recover in time and failing to play a buffering effect.

[0038] Reference Figure 8 、 Figure 9 as well as Figure 10 The exhaust mechanism 6 includes a fixed cylinder 601 located in the side exhaust hole 5 and fixedly connected to the side exhaust hole 5, the top end of the inner side of the fixed cylinder 601 is fixedly connected to the second support assembly 605, the bottom end of the inner side of the fixed cylinder 601 is fixedly connected to the sealing sponge 602, the top end of the sealing sponge 602 is movably connected to the first support assembly 603, the side of the first support assembly 603 is fixedly connected to the inner side of the fixed cylinder 601, the top end of the first support assembly 603 is movably connected to the exhaust valve 604, the side of the exhaust valve 604 is fixedly connected to the inside of the fixed cylinder 601, and the number of the exhaust valves 604 is four, four exhaust valves 6 04 has the same shape, and the distance between the second support assembly 605 and the exhaust valve 604 is half the diameter of each exhaust valve 604. The second support assembly 605 has the same structure as the first support assembly 603. The second support assembly 605 includes an outer limiting cylinder 6051 fixedly connected to the inner side of the fixed cylinder 601, the inner side of the outer limiting cylinder 6051 is fixedly connected to the first connecting plate 6052, the inner side of the first connecting plate 6052 is fixedly connected to the middle limiting cylinder 6053, the inner side of the middle limiting cylinder 6053 is fixedly connected to the second connecting cylinder 6054, and the inner side of the second connecting cylinder 6054 is fixedly connected to the inner limiting cylinder 6055.

[0039] In the embodiment of the present application, when the gas is discharged through the exhaust mechanism 6, the gas will be discharged through the exhaust valve 604. When discharged from the exhaust valve 604, the exhaust valve 604 will be squeezed upward, causing the exhaust valve 604 to bend upward, and the gas will be discharged upward through the junction of the four exhaust valves 604. After the gas is discharged, the exhaust valve 604 will reset and close. When the exhaust valve 604 is closed, a first support component 603 is provided under the exhaust valve 604 to prevent the exhaust valve 604 from bending downward, to prevent dust from entering from the exhaust valve 604, and to prevent dust from being present in the buffer bubble tube 4. A gap is left between the exhaust valve 604 and the second support component 605. There is space so that the exhaust valve 604 can bend upward to ensure the exhaust effect of the exhaust valve 604, and the bottom of the fixed tube 601 is provided with a sealing sponge 602 to prevent a small amount of dust from directly entering the buffer bubble tube 4 after long-term use. The second support component 605 can protect the exhaust valve 604 to prevent the exhaust valve 604 from being damaged and unable to play an interception effect. The interior of the second support component 605 is alternately arranged through the outer limit tube 6051, the first connecting plate 6052, the middle limit tube 6053, the second connecting tube 6054 and the inner limit tube 6055. Therefore, while providing support, the gas can pass freely to ensure the exhaust effect.

[0040] The working principle of the present invention is as follows: during installation, the rubber sealing layer 1 is connected to the edge of the sheet metal, and half of it is connected first. At this time, the sheet metal and the inner part of the rubber sealing layer 1 are connected halfway, so only the lower clamping tooth 10 is squeezed and deformed. After the entire rubber sealing layer 1 is connected to half of the edge of the sheet metal, the rubber sealing layer 1 is continued to be pressed so that the rubber sealing layer 1 is bent and fitted to the edge of the sheet metal. When the rubber sealing layer 1 is bent and fitted to the edge of the sheet metal, the upper clamping tooth 8 twists upward and squeezes the glue in the glue film bag 901 upward, and when the glue in the glue film bag 901 is squeezed to the location of the bag opening 902, the bag opening 902 is separated from the bonding layer 903, and the glue is squeezed out from above the bag opening 902, and then flows into the rubber sealing layer 1 and the edge of the sheet metal, bonding the edge of the sheet metal and the rubber sealing layer 1;

[0041] After the rubber sealing layer 1 is bonded to the edge of the sheet metal part, the buffer bubble tube 4 is squeezed to provide buffering. When the buffer bubble tube 4 is squeezed, if the squeezing direction is vertical or horizontal, the buffer bubble tube 4 will deform in the corresponding direction. When the buffer bubble tube 4 is deformed, the fixed marble 701 and the elastic rod 702 will be stretched horizontally or vertically. Therefore, when the squeezing force applied to the buffer bubble tube 4 disappears, the fixed marble 701 and the elastic rod 702 will automatically reset, so that the buffer bubble tube 4 can still recover relatively quickly after multiple squeezing.

[0042] When the buffer bubble tube 4 is squeezed and deformed, the gas in the buffer bubble tube 4 will be discharged through the ventilation holes 11 on both sides of the buffer bubble tube 4 and the side exhaust holes 5 above it. When discharged through the side exhaust holes 5, the gas will pass through the sealing sponge 602 and the first support component 603 and then be discharged from the exhaust valve 604. When discharged from the exhaust valve 604, the exhaust valve 604 will be squeezed upward, causing the exhaust valve 604 to bend upward. The gas will be discharged upward through the intersection of the four exhaust valves 604. After the gas is discharged, the exhaust valve 604 will reset and close.

[0043] When the buffer bubble tube 4 is squeezed and reset, the gas enters from the ventilation hole 11 and will pass through the dustproof sponge 12 to intercept the dust. When the exhaust valve 604 is closed, a first support component 603 is provided under the exhaust valve 604 to prevent the exhaust valve 604 from bending downward, to prevent dust from entering from the exhaust valve 604, and to prevent dust from being present in the buffer bubble tube 4.

[0044] Finally: The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An automobile sealing strip having a U-shaped skeleton structure, comprising a rubber sealing layer (1), characterized in that: The interior of the rubber sealing layer (1) is fixedly connected to a U-shaped support frame (2), the top of the rubber sealing layer (1) is fixedly connected to a connecting layer (3), the top of the connecting layer (3) is fixedly connected to a buffer bubble tube (4), the top of the buffer bubble tube (4) is provided with a side exhaust hole (5), the interior of the side exhaust hole (5) is fixedly connected to an exhaust mechanism (6), the interior of the buffer bubble tube (4) is fixedly connected to a support mechanism (7), ventilation holes (11) are provided on both sides of the buffer bubble tube (4), and the rubber sealing layer (1) is fixedly connected to a U-shaped support frame (2 ... and the top of the buffer bubble tube (4) is fixedly connected to a U-shaped support frame (2), the top of the connecting layer (3) is fixedly connected to a buffer bubble tube (4), and the top of the buffer bubble tube (4) is fixedly connected to a U-shaped support frame (2), The bottom end of the layer (1) is fixedly connected to a lower latching tooth (10), the middle part of the rubber sealing layer (1) is fixedly connected to an upper latching tooth (8), and the top end of the upper latching tooth (8) is fixedly connected to a bonding mechanism (9); the bonding mechanism (9) includes a glue film bag (901) filled with glue, the top end of the glue film bag (901) is fixedly connected to a bag opening (902), the inside of the bag opening (902) is glued with a bonding layer (903), and the bottom end of the glue film bag (901) is fixedly connected to the top end of the upper latching tooth (8); The support mechanism (7) comprises a fixed marble (701) fixedly connected to the interior of the buffer bubble tube (4); an elastic rod (702) is fixedly connected to the side of the fixed marble (701); four fixed marbles (701) and the elastic rod (702) are combined into a group, and the fixed marbles (701) and the elastic rod (702) in a group are arranged alternately; The exhaust mechanism (6) comprises a fixed cylinder (601) located in the side exhaust hole (5) and fixedly connected to the side exhaust hole (5); the top end of the inner side of the fixed cylinder (601) is fixedly connected to the second support assembly (605); and the bottom end of the inner side of the fixed cylinder (601) is fixedly connected to the sealing sponge (602); The top end of the sealing sponge (602) is movably connected to a first support assembly (603), the side of the first support assembly (603) is fixedly connected to the inner side of the fixed cylinder (601), the top end of the first support assembly (603) is movably connected to an exhaust valve (604), and the side of the exhaust valve (604) is fixedly connected to the inside of the fixed cylinder (601); The number of the exhaust valves (604) is four, the four exhaust valves (604) have the same shape, and the distance between the second support component (605) and the exhaust valve (604) is half the diameter of each exhaust valve (604), and the second support component (605) has the same structure as the first support component (603).

2. The automotive sealing strip with a U-shaped skeleton structure according to claim 1, characterized in that: The interior of the ventilation holes (11) is fixedly connected to a dustproof sponge (12); the support mechanism (7) and the exhaust mechanism (6) are alternately distributed inside the buffer bubble tube (4); the U-shaped support frame (2) is evenly distributed inside the rubber sealing layer (1); and the inner and outer surfaces of the U-shaped support frame (2) are provided with concave and convex textures.

3. The automotive sealing strip with a U-shaped skeleton structure according to claim 1, characterized in that: A group of fixed marbles (701) and elastic rods (702) are combined into a regular quadrilateral, a right angle is formed between two adjacent elastic rods (702), and a group of fixed marbles (701) and elastic rods (702) are fixedly connected to the buffer bubble tube (4) in a rhombus shape inside the buffer bubble tube (4).

4. The automotive sealing strip with a U-shaped skeleton structure according to claim 1, characterized in that: The second supporting assembly (605) includes an outer limiting cylinder (6051) fixedly connected to the inner side of the fixed cylinder (601), the inner side of the outer limiting cylinder (6051) is fixedly connected to a first connecting plate (6052), the inner side of the first connecting plate (6052) is fixedly connected to a middle limiting cylinder (6053), the inner side of the middle limiting cylinder (6053) is fixedly connected to a second connecting cylinder (6054), and the inner side of the second connecting cylinder (6054) is fixedly connected to an inner limiting cylinder (6055).

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