Seismic frame structure for assembled seismic-resistant building

Abstract

The present invention relates to the field of seismic technology for prefabricated buildings, and specifically refers to a seismic frame structure for prefabricated seismic buildings, which includes a friction pendulum seismic support, on which a frame connection base plate is fixedly installed, the frame connection base plate includes a rectangular base frame, on which a cross top cover is detachably installed, four evenly distributed first slide grooves are arranged in the rectangular base frame, a second slide groove corresponding to the first slide groove is arranged at the bottom of the cross top cover, and first mounting holes are arranged on both sides of the four ends of the cross top cover, wherein the two first mounting holes located between the two ends of the cross top cover are provided with a first hydraulic damping rod, a shock filtering base is arranged in the first slide groove and the second slide groove, and a frame main rod is arranged on the shock filtering base. The seismic frame structure for prefabricated seismic buildings of the present invention can effectively avoid the pitting caused by the friction plate base, and at the same time has a secondary shock absorption to prevent the friction plate base from being stuck and failing.

Description

Technical Field

[0001] The present invention relates to the technical field of earthquake-resistant assembly-type buildings, and in particular to an earthquake-resistant frame structure for earthquake-resistant assembly-type buildings. Background Art

[0002] Prefabricated earthquake-resistant buildings refer to building structures that use prefabricated components during the construction process and are assembled on site through specific connection techniques. These structures are usually designed to have good earthquake resistance to meet the construction needs of earthquake-prone areas. The earthquake-resistant frame structure used in the prefabricated earthquake-resistant buildings in the existing technology is mostly composed of an earthquake-resistant base and prefabricated beams and columns, and the earthquake-resistant base mostly uses a friction pendulum base. The friction pendulum base has a strong earthquake resistance to the shear waves of the earthquake during the earthquake resistance process. Although the longitudinal waves of the earthquake cause less damage to the building than the shear waves, the friction surface of the friction pendulum base will collide with the longitudinal waves because the spherical crown lining of the friction pendulum base will vibrate up and down with the longitudinal waves of the earthquake, causing pits to be smashed, making it difficult to reset the friction pendulum base, or it may get stuck during the next earthquake. In addition, since the friction pendulum base is located in the shock-absorbing layer and is often underground, the rubber ring used to wrap the outside of the friction pendulum base is dust-proof but not moisture-proof, which may cause the friction pendulum base to be difficult to reset or get stuck in extreme environments. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a seismic frame structure for assembled seismic-resistant buildings, which can effectively avoid the pitting caused by the friction plate base and has a secondary shock-absorbing function to prevent the friction plate base from getting stuck and failing.

[0004] To solve the above technical problems, the technical solution provided by the present invention is: an earthquake-resistant frame structure for assembled earthquake-resistant buildings, which includes a friction pendulum earthquake-resistant bearing, on which a frame connecting base plate is fixedly installed, and the frame connecting base plate includes a rectangular base frame, on which a cross top cover is detachably installed, four evenly distributed first slide grooves are arranged in the rectangular base frame, a second slide groove corresponding to the first slide groove is arranged at the bottom of the cross top cover, first mounting holes are arranged on both sides of the four ends of the cross top cover, and a first hydraulic damping rod is arranged on two of the first mounting holes between two adjacent ends of the cross top cover, a shock-absorbing base is arranged in the first slide groove and the second slide groove, a frame main rod is arranged on the shock-absorbing base, a frame side plate is arranged between the two frame main rods, and a connecting beam is arranged between two adjacent cross top covers.

[0005] As an improvement, the shock-absorbing base includes a base support plate slidably connected to the first slide groove and the second slide groove, and a cross spring damping rod is fixedly connected inside the base support plate.

[0006] As an improvement, a ball groove is provided on the base support plate, the frame main rod includes a rod body, a spherical joint matching the ball groove is provided at the bottom of the rod body, the side of the rod body is connected to the two first hydraulic damping rods, and a second hydraulic damping rod connected to the bottom of the rod body is provided on the base support plate.

[0007] As an improvement, the friction pendulum anti-seismic support includes a lower fixed seat, a lower sliding friction seat is provided on the lower fixed seat, a spherical crown lining is slidably connected to the lower sliding friction seat, an upper sliding friction seat is provided on the spherical crown lining, and sliding friction surfaces are provided between the upper sliding friction seat and the lower sliding friction seat and the spherical crown lining.

[0008] As an improvement, a damping telescopic column is provided on the upper sliding friction seat, a damping support seat is connected to the outer shell of the damping telescopic column, a spring is provided between the damping support seat and the damping telescopic column, an upper fixed seat is provided on the damping support seat, and the upper fixed seat is fixedly connected to the rectangular base frame.

[0009] As an improvement, the outer edges of the two sliding friction surfaces are both provided with anti-slip rings located on the upper sliding friction seat and the lower sliding friction seat.

[0010] As an improvement, the connecting beam includes a beam body, with first spring telescopic rods provided at both ends of the beam body, and two symmetrically distributed second spring telescopic rods provided on one side of the beam body, and the telescopic ends of the first spring telescopic rod and the second spring telescopic rod cooperate with the first mounting hole.

[0011] As an improvement, the frame side plate includes a plate body, and a plurality of evenly distributed damping rods are provided at both ends of the plate body close to the rod body. The rod body is provided with a plurality of evenly distributed second mounting holes, and the telescopic ends of the damping rods are fixedly connected to the second mounting holes.

[0012] As an improvement, the first hydraulic damping rod and the second hydraulic damping rod include a cylinder body, a hollow rod body is arranged in the cylinder body, the hollow rod body extends outside the cylinder body, a telescopic rod which can move in the cylinder body is sleeved on the hollow rod body, a piston is arranged at the bottom of the telescopic rod and is located between the cylinder body and the hollow rod body, a first oil hole is arranged at one end of the hollow rod body exposed from the cylinder body, a plurality of evenly distributed second oil holes are arranged at one end of the hollow rod body located in the cylinder body, a first return spring is arranged between the piston and the bottom of the cylinder body, and a second return spring is arranged between the piston and the top of the cylinder body

[0013] After adopting the above structure, the present invention has the following advantages:

[0014] 1. Through the damping telescopic column, damping support seat and pre-tension of the spring, the sliding friction seat is closely attached to the ball crown lining plate, and keeps the same frequency with the ball crown lining plate, so as to prevent the corners of the ball crown lining plate from smashing out of the pit, thereby reducing the possibility of difficulty in resetting and jamming;

[0015] 2. The lower fixed seat is installed on the concrete foundation pile. The seismic shear wave drives the lower fixed seat to shake through the concrete foundation pile, so that the spherical crown lining plate and the upper and lower sliding friction surfaces are displaced, so that the upper sliding friction seat and its upper structure do not move, thereby achieving the effect of shock absorption;

[0016] 3. The base support plate is transversely shock-proof by sliding between the first slide groove and the second slide groove and the cross spring damping rod. The cooperation between the ball joint and the ball groove can make the rod body swing slightly, thereby preventing the rod body from being irreparably bent;

[0017] 4. The first spring telescopic rod and the second spring telescopic rod are aligned with the corresponding first mounting holes and then popped out to complete the installation. When the beam is broken or damaged, it can be quickly rebuilt by combining the frame to connect the base plate;

[0018] 5. A first hydraulic damping rod and a second hydraulic damping rod are provided. Compared with the hydraulic damping device in the prior art, the extension and contraction degree thereof increases linearly with the pressure to which it is subjected, thereby ensuring the stability of the house while leaving a margin for the force caused by the shear wave of the earthquake. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of an earthquake-resistant frame structure for an assembled earthquake-resistant building of the present invention. Figure 1 .

[0020] Figure 2 It is a structural schematic diagram of a frame connection base plate of an earthquake-resistant frame structure for an assembled earthquake-resistant building of the present invention.

[0021] Figure 3 It is a partial cross-sectional view of a rectangular base frame of an earthquake-resistant frame structure for an assembled earthquake-resistant building of the present invention.

[0022] Figure 4 It is a disassembly diagram of a rectangular base frame and a cross top cover of an earthquake-resistant frame structure for an assembled earthquake-resistant building of the present invention.

[0023] Figure 5 It is a structural schematic diagram of a seismic filtering base of a seismic frame structure for an assembled seismic-resistant building of the present invention.

[0024] Figure 6 The present invention is a schematic structural diagram of a cross spring damping rod of an earthquake-resistant frame structure for an assembled earthquake-resistant building.

[0025] Figure 7 It is a structural schematic diagram of a friction pendulum seismic support of a seismic frame structure for an assembled seismic-resistant building of the present invention.

[0026] Figure 8 It is an exploded schematic diagram of a friction pendulum seismic support of a seismic frame structure for an assembled seismic-resistant building of the present invention.

[0027] Fig. 9 It is a partial cross-sectional view of a friction pendulum seismic support of a seismic frame structure for an assembled seismic-resistant building according to the present invention.

[0028] Fig.10 It is a structural schematic diagram of a connecting beam of an earthquake-resistant frame structure for an assembled earthquake-resistant building of the present invention.

[0029] Fig.11 This is a schematic diagram of the structure of an earthquake-resistant frame structure for an assembled earthquake-resistant building of the present invention. Figure 2 .

[0030] Fig.12 It is a partial cross-sectional view of a first hydraulic damping rod and a second hydraulic damping rod of a seismic frame structure for an assembled seismic-resistant building of the present invention.

[0031] As shown in the figure: 1. Friction pendulum anti-seismic support; 101. Lower fixed seat; 102. Lower sliding friction seat; 103. Sliding friction surface; 104. Ball crown lining; 105. Upper sliding friction seat; 106. Anti-slip ring; 107. Damping telescopic column; 108. Damping support seat; 109. Upper fixed seat; 110. Spring; 111. Rubber sleeve; 2. Frame connection base plate; 201. Rectangular base frame; 202. Cross top cover; 203. First slide groove; 204. Second slide groove; 205. First mounting hole; 206. First hydraulic damping rod; 2061. Cylinder body; 2062. Hollow rod body; 20 63. telescopic rod; 2064. first oil hole; 2065. second oil hole; 2066. first return spring; 2067. second return spring; 2068. piston; 207. shock filter base; 2071. base support plate; 2073. ball groove; 2074. cross spring damping rod; 2075. second hydraulic damping rod; 3. frame main rod; 301. rod body; 302. second mounting hole; 303. ball joint; 4. frame side plate; 401. plate body; 402. damping rod; 5. connecting beam; 501. beam body; 502. first spring telescopic rod; 503. second spring telescopic rod. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0033] Combined with Figure 7 , Attachment Figure 8 and attached Fig. 9 :

[0034] An anti-seismic frame structure for an assembled anti-seismic building, comprising a friction pendulum anti-seismic bearing 1, wherein the friction pendulum anti-seismic bearing 1 comprises a lower fixed seat 101, a lower sliding friction seat 102 is arranged on the lower fixed seat 101, a spherical crown lining plate 104 is slidably connected to the lower sliding friction seat 102, an upper sliding friction seat 105 is arranged on the spherical crown lining plate 104, and sliding friction surfaces 103 are arranged between the upper sliding friction seat 105 and the lower sliding friction seat 102 and the spherical crown lining plate 104;

[0035] The upper sliding friction seat 105 is provided with a damping telescopic column 107, the damping telescopic column 107 is outer-mounted with a damping support seat 108, a spring 110 is provided between the damping support seat 108 and the damping telescopic column 107, and an upper fixing seat 109 is provided on the damping support seat 108, and the upper fixing seat 109 is fixedly connected to the rectangular base frame 201;

[0036] The outer edges of the two sliding friction surfaces 103 are both provided with anti-slip rings 106 located on the upper sliding friction seat 105 and the lower sliding friction seat 102 .

[0037] The outer edges of the damping support seat 108, the upper sliding friction seat 105 and the lower sliding friction seat 102 of the friction pendulum anti-seismic bearing 1 are wrapped with a rubber sleeve 111. The rubber sleeve 111 is used to prevent dust and debris on the one hand, and is conducive to the resetting of the friction pendulum anti-seismic bearing 1 on the other hand. The lower fixed seat 101 is installed on the concrete pile foundation. The earthquake shear wave drives the lower fixed seat 101 to shake through the concrete pile foundation, so that the spherical crown lining plate 104 and the upper and lower sliding friction surfaces 103 are misaligned, so that the upper sliding friction seat 105 and its upper structure are not displaced, and the anti-slip ring 106 is used to prevent the spherical crown lining plate 104 from falling off.

[0038] The longitudinal earthquake wave causes the friction pendulum seismic bearing 1 to vibrate up and down as a whole, causing a gap between the spherical crown lining 104 and the upper and lower sliding friction surfaces 103. Since other structures limit the time difference in the fall of the spherical crown lining 104 and the upper sliding friction seat 105, it is easy for the corners of the spherical crown lining 104 to be dented on the lower sliding friction seat 102. Through the damping telescopic column 107, the damping support seat 108 and the pre-tension of the spring 110, the upper sliding friction seat 105 is kept in close contact with the spherical crown lining 104 and keeps the same frequency as the spherical crown lining 104, thereby preventing the corners of the spherical crown lining 104 from denting, thereby reducing the possibility of difficulty in resetting and jamming.

[0039] Combined with Figure 1 , Attachment Figure 2 , Attachment Figure 3 , Attachment Figure 4 , Attachment Figure 5 and attached Figure 6 :

[0040] A frame connection base plate 2 is fixedly mounted on the friction pendulum anti-seismic support 1, and the frame connection base plate 2 comprises a rectangular base frame 201, on which a cross top cover 202 is detachably mounted, four evenly distributed first slide grooves 203 are arranged in the rectangular base frame 201, a second slide groove 204 corresponding to the first slide groove 203 is arranged at the bottom of the cross top cover 202, first mounting holes 205 are arranged on both sides of the four ends of the cross top cover 202, and first hydraulic damping rods 206 are arranged on the two first mounting holes 205 between two adjacent ends of the cross top cover 202, a shock filtering base 207 is arranged in the first slide groove 203 and the second slide groove 204, a frame main rod 3 is arranged on the shock filtering base 207, a frame side plate 4 is arranged between the two frame main rods 3, and a connecting beam 5 is arranged between two adjacent cross top covers 202;

[0041] The shock-filter base 207 includes a base support plate 2071 slidably connected to the first slide groove 203 and the second slide groove 204, and a cross spring damping rod 2074 is fixedly connected inside the base support plate 2071;

[0042] The base support plate 2071 is provided with a ball groove 2073, and the frame main rod 3 includes a rod body 301, and a ball joint 303 matching the ball groove 2073 is provided at the bottom of the rod body 301, and the side of the rod body 301 is connected to the two first hydraulic damping rods 206, and the base support plate 2071 is provided with a second hydraulic damping rod 2075 connected to the bottom of the rod body 301.

[0043] Through the above structure, the two first hydraulic damping rods 206 and the second hydraulic damping rod 2075 provide balance for the rod body 301, so that the rod body 301 is in a stable position. When the friction pendulum seismic bearing 1 is difficult to reset and difficult to move, the earthquake shear wave is transmitted upward, and the base support plate 2071 is laterally shock-proof by sliding between the first slide groove 203 and the second slide groove 204 and the cross spring damping rod 2074. The cooperation between the ball joint 303 and the ball groove 2073 can make the rod body 301 swing slightly, thereby preventing the rod body 301 from being irreparably bent.

[0044] Combined with Figure 4 , Attachment Figure 5 and attached Fig.12 :

[0045] The first hydraulic damping rod 206 and the second hydraulic damping rod 2075 include a cylinder body 2061, a hollow rod body 2062 is provided in the cylinder body 2061, the hollow rod body 2062 extends to the outside of the cylinder body 2061, a telescopic rod 2063 is sleeved on the hollow rod body 2062 and can move in the cylinder body 2061, a piston 2068 is provided at the bottom of the telescopic rod 2063 and is located between the cylinder body 2061 and the hollow rod body 2062, a first oil hole 2064 is provided at the end of the hollow rod body 2062 exposed from the cylinder body 2061, a plurality of evenly distributed second oil holes 2065 are provided at the end of the hollow rod body 2062 located in the cylinder body 2061, a first return spring 2066 is provided between the piston 2068 and the bottom of the cylinder body 2061, and a second return spring 2067 is provided between the piston 2068 and the top of the cylinder body 2061.

[0046] An oil chamber A is formed between the hollow rod body 2062 and the telescopic rod 2063, an oil chamber B is formed in the hollow rod body 2062, an oil chamber C is formed between the piston 2068, the cylinder body 2061 and the hollow rod body 2062, and an oil chamber D is formed between the piston 2068, the cylinder body 2061 and the telescopic rod 2063. Fig.12 , the A oil chamber, the B oil chamber, the C oil chamber and the D oil chamber are all filled with hydraulic damping oil. When the telescopic rod 2063 is compressed, the hydraulic damping oil in the A oil chamber is compressed, so that the hydraulic damping oil in the B oil chamber flows into the C oil chamber through the second oil hole 2065, and then enters the D oil chamber through the gap between the piston 2068 and the cylinder body 2061. As the piston 2068 continues to approach the bottom of the cylinder body 2061, the telescopic rod 2063 will cover part of the second oil hole 2065, resulting in a reduction in the second oil hole 2065 communicating with the C oil chamber, so that the hydraulic damping oil in the B oil chamber is not easy to flow into the C oil chamber, resulting in the telescopic rod 2063. It is difficult to continue to compress. Through this structure, compared with the hydraulic damping device in the prior art, its degree of expansion and contraction increases linearly with the pressure it is subjected to. While leaving a margin for the force caused by the seismic shear wave, the stability of the house is guaranteed. The first return spring 2066 and the second return spring 2067 are used for resetting.

[0047] Combined with Figure 2 , Attachment Fig.10 and attached Fig.11 :

[0048] The connecting beam 5 includes a beam body 501, and first spring telescopic rods 502 are provided at both ends of the beam body 501. Two symmetrically distributed second spring telescopic rods 503 are provided on one side of the beam body 501. The telescopic ends of the first spring telescopic rod 502 and the second spring telescopic rod 503 are matched with the first mounting hole 205.

[0049] Through this structure, the beam body 501 is pushed between the two cross top covers 202, see the attached Fig.11The first spring telescopic rod 502 and the second spring telescopic rod 503 are relative to the corresponding first installation hole 205 and then popped out to complete the installation. When the beam body 501 is broken and damaged, it can be quickly rebuilt by combining the frame connecting substrate 2.

[0050] Combined with Figure 2 and attached Fig.11 :

[0051] The frame side panel 4 includes a plate body 401, and a plurality of evenly distributed damping rods 402 are provided at both ends of the plate body 401 close to the rod body 301. A plurality of evenly distributed second mounting holes 302 are provided on the rod body 301, and the telescopic ends of the damping rods 402 are fixedly connected to the second mounting holes 302. Through this structure, the plate body 401 is a building frame part, which is used to support the side wall of the building. The rod body 301 and the plate body 401 are connected by the damping rods 402, and a certain gap is left in the middle, so as to reduce the irreparable damage caused by the earthquake.

[0052] During the specific implementation of the present invention, the longitudinal earthquake wave causes the friction pendulum anti-seismic support 1 to vibrate up and down as a whole, causing the gap between the spherical crown lining plate 104 and the upper and lower sliding friction surfaces 103. Due to the time difference between the falling of the spherical crown lining plate 104 and the upper sliding friction seat 105 restricted by other structures, the corners of the spherical crown lining plate 104 are prone to be dented on the lower sliding friction seat 102. Through the damping telescopic column 107, the damping support seat 108 and the pre-tension of the spring 110, the upper sliding friction seat 105 is closely attached to the spherical crown lining plate 104 and keeps the same frequency with the spherical crown lining plate 104, thereby preventing the corners of the spherical crown lining plate 104 from being dented, thereby reducing the possibility of difficulty in resetting and jamming.

[0053] The seismic shear wave drives the lower fixed seat 101 to shake through the concrete foundation piles, causing the spherical cap lining 104 to be displaced from the upper and lower sliding friction surfaces 103, thereby preventing the upper sliding friction seat 105 and its upper structure from being displaced;

[0054] The two first hydraulic damping rods 206 and the second hydraulic damping rod 2075 provide vertical balance for the rod body 301. When the friction pendulum seismic bearing 1 is difficult to reset and move, the seismic shear wave is transmitted upward, and the base support plate 2071 is laterally shock-proof by sliding between the first slide groove 203 and the second slide groove 204 and the cross spring damping rod 2074. The cooperation between the ball joint 303 and the ball groove 2073 can make the rod body 301 swing slightly, thereby preventing the rod body 301 from being irreparably bent.

[0055] The present invention and its implementation methods are described above, and such description is not restrictive, and the actual structure is not limited thereto. In general, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can creatively design a structure and implementation method similar to the technical solution, which should fall within the protection scope of the present invention.

Claims

1. An earthquake-resistant frame structure for an assembled earthquake-resistant building, comprising a friction pendulum earthquake-resistant support (1), characterized in that: A frame connection base plate (2) is fixedly mounted on the friction pendulum anti-seismic support (1), the frame connection base plate (2) comprising a rectangular base frame (201), a cross top cover (202) being detachably mounted on the rectangular base frame (201), four evenly distributed first slide grooves (203) being arranged in the rectangular base frame (201), a second slide groove (204) corresponding to the first slide groove (203) being arranged at the bottom of the cross top cover (202), first mounting holes (205) being arranged on both sides of the four ends of the cross top cover (202), a first hydraulic damping rod (206) being arranged on two of the first mounting holes (205) between two adjacent ends of the cross top cover (202), a shock filtering base (207) being arranged in the first slide groove (203) and the second slide groove (204), a frame main rod (3) being arranged on the shock filtering base (207), a frame side plate (4) being arranged between two of the frame main rods (3), and a connecting beam (5) being arranged between two adjacent cross top covers (202); The friction pendulum anti-seismic support (1) comprises a lower fixed seat (101), a lower sliding friction seat (102) is provided on the lower fixed seat (101), a spherical crown lining plate (104) is slidably connected to the lower sliding friction seat (102), an upper sliding friction seat (105) is provided on the spherical crown lining plate (104), and sliding friction surfaces (103) are provided between the upper sliding friction seat (105) and the lower sliding friction seat (102) and the spherical crown lining plate (104); The upper sliding friction seat (105) is provided with a damping telescopic column (107), the damping telescopic column (107) is outer-mounted with a damping support seat (108), a spring (110) is provided between the damping support seat (108) and the damping telescopic column (107), an upper fixed seat (109) is provided on the damping support seat (108), and the upper fixed seat (109) is fixedly connected to the rectangular base frame (201).

2. The seismic frame structure for an assembled seismic-resistant building according to claim 1, characterized in that: The shock-absorbing base (207) comprises a base support plate (2071) slidably connected to the first slide groove (203) and the second slide groove (204), and a cross spring damping rod (2074) is fixedly connected inside the base support plate (2071).

3. The seismic frame structure for an assembled seismic-resistant building according to claim 2, characterized in that: The base support plate (2071) is provided with a ball groove (2073), the frame main rod (3) comprises a rod body (301), a ball joint (303) matching the ball groove (2073) is provided at the bottom of the rod body (301), the side of the rod body (301) is connected to the two first hydraulic damping rods (206), and the base support plate (2071) is provided with a second hydraulic damping rod (2075) connected to the bottom of the rod body (301).

4. The seismic frame structure for an assembled seismic-resistant building according to claim 1, characterized in that: Anti-slip rings (106) located on the upper sliding friction seat (105) and the lower sliding friction seat (102) are provided at the outer edges of the two sliding friction surfaces (103).

5. The seismic frame structure for an assembled seismic-resistant building according to claim 1, characterized in that: The connecting beam (5) comprises a beam body (501), first spring telescopic rods (502) are provided at both ends of the beam body (501), two symmetrically distributed second spring telescopic rods (503) are provided on one side of the beam body (501), and the telescopic ends of the first spring telescopic rod (502) and the second spring telescopic rod (503) are matched with the first mounting hole (205).

6. The seismic frame structure for an assembled seismic-resistant building according to claim 3, characterized in that: The frame side plate (4) comprises a plate body (401), and a plurality of evenly distributed damping rods (402) are provided at both ends of the plate body (401) close to the rod body (301). A plurality of evenly distributed second mounting holes (302) are provided on the rod body (301), and telescopic ends of the damping rods (402) are fixedly connected to the second mounting holes (302).

7. The seismic frame structure for an assembled seismic-resistant building according to claim 2, characterized in that: The first hydraulic damping rod (206) and the second hydraulic damping rod (2075) comprise a cylinder body (2061), a hollow rod body (2062) is provided in the cylinder body (2061), the hollow rod body (2062) extends outside the cylinder body (2061), a telescopic rod (2063) is sleeved on the hollow rod body (2062) and is movable in the cylinder body (2061), and a movable member is provided at the bottom of the telescopic rod (2063) between the cylinder body (2061) and the hollow rod body (2062). A plug (2068) is provided, one end of the hollow rod body (2062) exposed from the cylinder body (2061) is provided with a first oil hole (2064), one end of the hollow rod body (2062) located in the cylinder body (2061) is provided with a plurality of evenly distributed second oil holes (2065), a first return spring (2066) is provided between the piston (2068) and the bottom of the cylinder body (2061), and a second return spring (2067) is provided between the piston (2068) and the top of the cylinder body (2061).

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