Support structure for a liquid hydrogen tank

Abstract

The utility model discloses a kind of support structure of liquid hydrogen storage tank, including support frame and lifting mechanism;Support frame: its upper end is rotatably connected with support arc plate by rotating column, the inside of support frame is provided with centring adjusting mechanism, centring adjusting mechanism includes sliding cavity, sliding seat and adjusting handle, the inside of sliding cavity is slidably connected with sliding seat, the middle part of sliding seat outer surface is rotatably connected with the adjusting handle of uniform distribution, the end of adjusting handle far from the center of support frame is rotatably connected with the lower end of adjacent moving frame;Lifting mechanism: it is respectively set in the upper end of moving frame, the upper end of lifting mechanism is provided with support disc, the upper surface of support disc is provided with frosted surface, the support structure of this liquid hydrogen storage tank can realize the stable support of different diameter liquid hydrogen storage tank under different working environment, greatly improve the installation efficiency and installation firmness of liquid hydrogen storage tank.

Description

Technical Field

[0001] This utility model relates to the technical field of auxiliary equipment for liquid hydrogen storage tanks, specifically a support structure for a liquid hydrogen storage tank. Background Technology

[0002] Liquid hydrogen storage tanks are key equipment in the hydrogen energy industry chain for achieving cryogenic liquid hydrogen storage. Their core function is to store liquid hydrogen (boiling point -252.78℃, density 70.85 kg / m³) in an insulated, sealed environment, preventing vaporization and evaporation due to thermal penetration from the environment. Liquid hydrogen has a density 1.8 times that of high-pressure gaseous hydrogen (70 MPa), allowing for the storage of more hydrogen energy in the same volume. The supporting structure of the liquid hydrogen storage tank is crucial for ensuring stable storage.

[0003] In the prior art, patent publication number CN115962411A discloses a support structure for spherical liquid hydrogen storage tanks, comprising a double-shell spherical storage tank, a sandwich insulation material, and a support system. The double-shell spherical storage tank consists of an outer tank shell and an inner tank shell. The support system includes a vertical support structure for the inner tank, a horizontal support structure for the inner tank, and a support structure for the outer tank. This support structure for spherical liquid hydrogen storage tanks can only support spherical liquid hydrogen storage tanks of a specific diameter and cannot handle the support work for cylindrical liquid hydrogen storage tanks. Furthermore, it cannot be adjusted according to changes in the working environment and the diameter of the liquid hydrogen storage tank, affecting the stable support of the liquid hydrogen storage tank. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the existing defects and provide a support structure for liquid hydrogen storage tanks that can stably support liquid hydrogen storage tanks of different diameters under different working environments, greatly improving the installation efficiency and installation firmness of liquid hydrogen storage tanks, and effectively solving the problems in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a support structure for a liquid hydrogen storage tank, including a support frame and a lifting mechanism;

[0006] Support frame: Its upper end is rotatably connected to a support arc plate via a rotating column. The support frame is equipped with a centering adjustment mechanism, which includes a sliding cavity, a sliding seat, and an adjustment handle. The sliding cavity is located inside the support frame. The sliding seat is slidably connected inside the sliding cavity. The center of the outer surface of the sliding seat is rotatably connected to an evenly distributed adjustment handle. The end of the adjustment handle away from the center of the support frame is rotatably connected to the lower end of the adjacent movable frame.

[0007] Lifting mechanism: It is set at the upper end of the mobile frame. The upper end of the lifting mechanism is equipped with a support plate. The upper surface of the support plate is frosted, which can realize stable support for liquid hydrogen storage tanks of different diameters under different working environments, greatly improving the installation efficiency and installation stability of liquid hydrogen storage tanks.

[0008] Furthermore, the centering adjustment mechanism also includes a screw, a rotating shaft, and a knob. The screw is rotatably connected to the interior of the sliding seat, and the middle part of the screw is threadedly connected to the interior of the sliding seat. A drive chamber is provided at the lower end of the support frame, and the lower end of the screw extends into the interior of the drive chamber. A driven helical gear is fixedly connected to the lower end of the screw. A rotating shaft is rotatably connected to the front end of the drive chamber, and a knob is fixedly connected to the front end of the rotating shaft. A drive helical gear is fixedly connected to the rear end of the rotating shaft. The drive helical gear meshes with the driven helical gear to provide driving force for adjusting the centering distance of the moving frame.

[0009] Furthermore, the centering adjustment mechanism also includes support rods, grounding seats, and ground spikes. The support rods are all symmetrically rotatably connected to the middle of the adjustment handle via a fixed axis. The lower ends of two adjacent support rods are rotatably connected to grounding seats. The ends of the grounding seats away from the center of the support frame are slidably connected to ground spikes, providing diagonal bracing for the adjustment handle, increasing the force points, and further improving the stable support for the liquid hydrogen storage tank.

[0010] Furthermore, corrugated pipes are fixedly connected between the top wall of the sliding cavity and the upper surface of the sliding seat, and between the bottom wall of the sliding cavity and the lower surface of the sliding seat. The corrugated pipes are movably sleeved on the outer surface of the screw to protect the screw.

[0011] Furthermore, the lifting mechanism includes a lifting cavity, a lifting rod, a locking groove, a slot, a locking plate, and ribs. The lifting cavities are all located at the upper end of the movable frame, and the upper end of the movable frame is provided with a locking chamber. The upper and lower ends of the locking chamber are provided with sliding openings. A lifting rod is slidably connected between two vertically adjacent sliding openings and the lifting cavity. The left and right ends of the outer surface of the lifting rod are provided with locking grooves. The end of the locking chamber away from the center of the support frame is provided with a slot. A locking plate is inserted into the inside of each slot. Two ribs are fixedly connected inside each locking plate. The ribs are installed in conjunction with the adjacent locking grooves. A fixed ball is fixedly connected to the upper end of each lifting rod. The fixed ball is rotatably connected to the lower end of the vertically adjacent support plate to realize the lifting and lowering of the support plate and meet the stable support of liquid hydrogen storage tanks of different diameters.

[0012] Furthermore, each of the lower ends of the lifting rod is fixedly connected to a lifting seat, and each lifting seat is slidably connected to the interior of an adjacent lifting cavity. Each of the left and right ends of the lifting seat is rotatably connected to a rotating seat, and each of the rotating seats on the front and rear sides is fixedly connected to a guide cylinder in the middle. Each of the rotating seats on the left and right sides is fixedly connected to a guide column in the middle. The outer surface of each guide column is slidably connected to the interior of an adjacent guide cylinder to ensure the synchronous movement of the four moving frames.

[0013] Furthermore, the lifting seat has symmetrically distributed indicator arrows on the surface away from the center of the support frame, and the moving frame has symmetrically distributed scale bars on the surface away from the center of the support frame. The indicator arrows are installed in conjunction with the adjacent scale bars to provide information support for the height adjustment of the support plate.

[0014] Furthermore, the lower ends of the support frame and the four movable frames are all fixedly connected to mounting bases, and the interior of each mounting base is provided with evenly distributed mounting holes to realize the support frame and the movable frames.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: The supporting structure of this liquid hydrogen storage tank has the following advantages:

[0016] The pyramidal mechanism is composed of an adjusting handle, a working surface, and a support frame. The diagonal bracing of the support rod further enhances the stability of the pyramidal mechanism. The lifting mechanism enables the movement of the support plate, and the position of the support plate is locked through mortise and tenon joints. This allows for stable support of liquid hydrogen storage tanks of different diameters under different working environments, greatly improving the installation efficiency and stability of liquid hydrogen storage tanks. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a cross-sectional view of the internal structure of this utility model;

[0019] Figure 3 This is a cross-sectional view of the left side of the present invention;

[0020] Figure 4 This is an enlarged structural diagram of point A in this utility model;

[0021] Figure 5 This is a schematic diagram of the locking plate structure of this utility model;

[0022] Figure 6 This is an enlarged structural diagram of section B of the present invention.

[0023] In the diagram: 1. Support frame, 2. Moving frame, 3. Centering adjustment mechanism, 31. Sliding cavity, 32. Screw, 33. Sliding seat, 34. Rotating shaft, 35. Knob, 36. Adjusting handle, 37. Support rod, 38. Grounding seat, 39. Ground nail, 4. Lifting mechanism, 41. Lifting cavity, 42. Lifting rod, 43. Locking groove, 44. Slot, 45. Locking plate, 46. Rib, 5. Fixed ball, 6. Support plate, 7. Support arc plate, 8. Lifting seat, 9. Rotating seat, 10. Guide cylinder, 11. Guide column, 12. Scale strip, 13. Mounting seat, 14. Corrugated pipe. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1-5 This embodiment provides a technical solution: a support structure for a liquid hydrogen storage tank, including a support frame 1 and a lifting mechanism 4;

[0026] Support frame 1: Its upper end is rotatably connected to a support arc plate 7 via a rotating column. The lower ends of support frame 1 and four movable frames 2 are all fixedly connected to mounting bases 13. The mounting bases 13 are all provided with evenly distributed mounting holes. The support frame 1 is provided with a centering adjustment mechanism 3. The centering adjustment mechanism 3 includes a sliding cavity 31, a sliding seat 33, and an adjustment handle 36. The sliding cavity 31 is located inside the support frame 1. The sliding seat 33 is slidably connected inside the sliding cavity 31. The center of the outer surface of the sliding seat 33 is rotatably connected to an evenly distributed adjustment handle 36. The end of the adjustment handle 36 away from the center of the support frame 1 is rotatably connected to the lower end of the adjacent movable frame 2. The centering adjustment mechanism 3 also includes a screw 32, a rotating shaft 34, and a knob 35. The screw 32 is rotatably connected to the screw 36. Inside the support frame 1, the middle part of the screw 32 is threadedly connected to the sliding seat 33. The lower end of the support frame 1 is provided with a drive chamber. The lower end of the screw 32 extends into the interior of the drive chamber. A driven helical gear is fixedly connected to the lower end of the screw 32. A rotating shaft 34 is rotatably connected to the front end of the drive chamber. A knob 35 is fixedly connected to the front end of the rotating shaft 34. A driving helical gear is fixedly connected to the rear end of the rotating shaft 34. The driving helical gear meshes with the driven helical gear. The centering adjustment mechanism 3 also includes a support rod 37, a grounding seat 38, and a ground nail 39. The support rods 37 are all symmetrically rotatably connected to the middle part of the adjustment handle 36 through a fixed axis. The lower ends of two adjacent support rods 37 are rotatably connected to the grounding seat 38. The end of the grounding seat 38 away from the center of the support frame 1 is slidably connected to the ground nail 39. Bellows 14 are fixedly connected between the top wall of the sliding cavity 31 and the upper surface of the sliding seat 33, and between the bottom wall of the sliding cavity 31 and the lower surface of the sliding seat 33. When the sliding seat 33 moves down, the upper bellows 14 extends and the lower bellows 14 contracts, always providing sealing protection for the screw 32. The bellows 14 are movably sleeved on the outer surface of the screw 32. According to the diameter of the liquid hydrogen storage tank to be supported, the knob 35 is rotated. The rotation of the knob 35 drives the rotating shaft 34 to rotate. The rotation of the rotating shaft 34 drives the driving helical gear to rotate. The rotation of the driving helical gear drives the driven helical gear to rotate. The rotation of the driven helical gear drives the screw 32 to rotate. The rotation of the screw 32 causes the sliding seat 33 to move down. The movement of the sliding seat 33 causes the upper end of the adjusting handle 36 to move down, thereby adjusting the... The lower end of handle 36 pushes the adjacent movable frame 2 to move outwards in a centered manner. During the outward movement of the movable frame 2, the rotating seat 9 rotates accordingly, following the change in position of the movable frame 2 relative to the central axis of the support frame 1. At the same time, the guide column 11 slides relative to the interior of the corresponding guide cylinder 10, ensuring the synchronicity of the movement of the four movable frames 2. Before adjustment, the work site is measured using external measuring tools, and the termination position of the movable frame 2 is marked according to the installation requirements of the liquid hydrogen storage tank in the work environment. When the movable frames 2 have all moved to the corresponding positions, the knob 35 is stopped, and then the support rod 37 is rotated so that the angle between the support rod 37 and the radially adjacent adjusting handle 36 at the end away from the center of the support frame 1 is greater than 90 degrees.Then, the grounding seat 38 is rotated to make it fit against and parallel to the working surface. The ground nail 39 is then driven into the working ground using an external hammer. The support rod 37 provides diagonal bracing for the adjusting handle 36, improving the stability of the cone formed by the four adjusting handles 36, the working surface, and the support frame 1, thereby achieving stable support for the liquid hydrogen storage tank. Finally, the mounting holes inside the mounting base 13 at the lower end of the moving frame 2 are stably connected to the threaded holes in the working area using bolts, thus achieving stable installation of the overall support structure of the liquid hydrogen storage tank.

[0027] Lifting mechanism 4: It is respectively set at the upper end of the movable frame 2. The upper end of the lifting mechanism 4 is provided with a support plate 6. The upper surface of the support plate 6 is provided with a frosted surface. The lifting mechanism 4 includes a lifting cavity 41, a lifting rod 42, a locking groove 43, a slot 44, a locking plate 45, and a rib 46. The lifting cavity 41 is set at the upper end of the movable frame 2. The upper end of the movable frame 2 is provided with a locking chamber. The upper and lower ends of the locking chamber are provided with sliding openings. The lifting rod 42 is slidably connected between two vertically adjacent sliding openings and the lifting cavity 41. The left and right ends of the outer surface of the lifting rod 42 are provided with locking grooves 43. The end of the locking chamber away from the center of the support frame 1 is provided with a slot 44. The locking plate 45 is inserted into the inside of the slot 44. The inside of the locking plate 45 is fixed. The fixed connection has two ribs 46, each of which is installed in conjunction with an adjacent locking groove 43. The upper end of the lifting rod 42 is fixedly connected to a fixed ball 5, which is rotatably connected to the lower end of the vertically adjacent support plate 6. The lower end of the lifting rod 42 is fixedly connected to a lifting seat 8, which is slidably connected to the interior of an adjacent lifting cavity 41. Rotating seats 9 are rotatably connected to both ends of the lifting seat 8. Guide cylinders 10 are fixedly connected to the middle of the rotating seats 9 on both the front and rear sides. Guide columns 11 are fixedly connected to the middle of the rotating seats 9 on both the left and right sides. The outer surface of the guide columns 11 is slidably connected to the interior of the adjacent guide cylinders 10. Symmetrically distributed indicator arrows are provided on the surface of the lifting seat 8 away from the center of the support frame 1. The movable frame 2... Symmetrically distributed scale bars 12 are provided on the surface away from the center of the support frame 1. The vertically adjacent support plates 6 and lifting seats 8 have equal rising distances and equal spacing. The rising distance of the lifting seat 8 plus the spacing between the vertically adjacent support plates 6 and lifting seats 8 equals the real-time height of the support plate 6. Within the lifting range of the lifting seat 8, the height change data of the support plate 6 is quantified and displayed through the scale bars 12. The indicator arrows are all installed in conjunction with the adjacent scale bars 12. According to the support requirements of the liquid hydrogen storage tank, the four lifting rods 42 are first slid vertically. The upward movement of the lifting rods 42 drives the vertically adjacent lifting seats 8 to move upward. At the same time, the upward movement of the lifting rods 42 drives the vertically adjacent fixed seats 8 to move upward. Ball 5 moves upward, which in turn drives the corresponding support plate 6 to move upward. According to the scale inside the scale bar 12, where the indicator arrow on the surface of the lifting seat 8 away from the center of the support frame 1 is on the same horizontal plane, the real-time height of the support plate 6 can be obtained. When all the support plates 6 reach the required height, the locking plates 45 are inserted into the corresponding slots 44, so that the two ribs 46 inside the locking plates 45 are tightly inserted into the radially adjacent locking grooves 43, thereby locking the vertical position of the lifting rod 42, and finally locking the vertical position of the support plate 6. Since the mutual spacing of the four support plates 6 is equal and the centering distance with the central axis of the support frame 1 is equal, it can achieve stable support for the cylindrical liquid hydrogen storage tank or the spherical liquid hydrogen storage tank in cooperation with the support arc plate 7.

[0028] The working principle of the support structure for a liquid hydrogen storage tank provided by this utility model is as follows: During operation, the mounting holes inside the mounting base 13 at the lower end of the support frame 1 are first stably connected to the threaded holes in the working area using bolts. Then, according to the diameter of the liquid hydrogen storage tank to be supported, the operator rotates the knob 35. The rotation of the knob 35 drives the rotating shaft 34 to rotate, which in turn drives the driving helical gear to rotate. The driving helical gear then drives the driven helical gear to rotate, which in turn drives the screw 32 to rotate. The rotation of the screw 32 causes the sliding seat 33 to move downwards, which in turn causes the upper end of the adjusting handle 36 to move downwards. This, in turn, causes the lower end of the adjusting handle 36 to push the adjacent moving frames 2 outwards in a centered manner. During the outward movement of the moving frames 2, the rotating shaft 35 rotates the screw 32 to rotate. The moving base 9 rotates accordingly, following the position change of the moving frame 2 relative to the central axis of the support frame 1. Simultaneously, the guide columns 11 slide relative to the interior of the corresponding guide cylinders 10, ensuring the synchronicity of the movement of the four moving frames 2. Before adjustment, the work site is measured using external measuring tools, and the termination position of the moving frame 2 is marked based on the installation requirements of the liquid hydrogen storage tank in the work environment. When all four moving frames 2 have moved to their corresponding positions, the operator stops rotating the knob 35. Then, the operator rotates the support rod 37 so that the angle between the support rod 37 and the radially adjacent adjusting handle 36 at the end furthest from the center of the support frame 1 is greater than 90 degrees. Then, the operator rotates the grounding seat 38 so that the grounding seat 38 is in contact with the working surface and... The working surface is parallel, and then the ground nails 39 are driven into the working ground by the external hammer. The support rod 37 provides diagonal bracing for the adjusting handle 36, improving the stability of the cone formed by the four adjusting handles 36, the working surface, and the support frame 1, thereby achieving stable support for the liquid hydrogen storage tank. Then, the personnel use bolts to stably connect the mounting holes inside the mounting base 13 at the lower end of the moving frame 2 with the threaded holes in the working area, thereby achieving stable installation of the overall support structure of the liquid hydrogen storage tank. Then, according to the support requirements of the liquid hydrogen storage tank, the personnel first slide the four lifting rods 42 vertically. The upward movement of the lifting rods 42 drives the vertically adjacent lifting seats 8 to move upward. At the same time, the upward movement of the lifting rods 42 drives the vertically adjacent fixed balls 5 to move upward, thereby driving the corresponding support plates 6 to move upward. The support plate 6 and the lifting seat 8 have equal rising distances. According to the scale inside the scale bar 12, where the indicator arrow on the surface of the lifting seat 8 away from the center of the support frame 1 is at the same horizontal plane, the real-time height of the support plate 6 can be obtained. When all the support plates 6 reach the required height, the personnel insert the locking plates 45 into the corresponding slots 44, so that the two ribs 46 inside the locking plates 45 are tightly inserted into the radially adjacent locking grooves 43, thereby realizing the vertical locking of the lifting rod 42, and finally realizing the vertical locking of the support plate 6. Since the mutual distance of the four support plates 6 is equal and the center distance with the central axis of the support frame 1 is equal, it can achieve stable support for the cylindrical liquid hydrogen storage tank or the spherical liquid hydrogen storage tank in cooperation with the support arc plate 7.

[0029] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A support structure for a liquid hydrogen storage tank, characterized by: Includes a support frame (1) and a lifting mechanism (4); Support frame (1): Its upper end is rotatably connected to a support arc plate (7) via a rotating column. The support frame (1) is equipped with a centering adjustment mechanism (3). The centering adjustment mechanism (3) includes a sliding cavity (31), a sliding seat (33), and an adjustment handle (36). The sliding cavity (31) is located inside the support frame (1). The sliding seat (33) is slidably connected inside the sliding cavity (31). The center of the outer surface of the sliding seat (33) is rotatably connected to an evenly distributed adjustment handle (36). The end of the adjustment handle (36) away from the center of the support frame (1) is rotatably connected to the lower end of the adjacent movable frame (2). Lifting mechanism (4): It is respectively set at the upper end of the mobile frame (2). The upper end of the lifting mechanism (4) is provided with a support plate (6), and the upper surface of the support plate (6) is provided with a frosted surface.

2. The support structure for a liquid hydrogen tank according to claim 1, characterized by: The centering adjustment mechanism (3) further includes a screw (32), a rotating shaft (34), and a knob (35). The screw (32) is rotatably connected to the inside of the screw (32). The middle part of the screw (32) is threadedly connected to the inside of the sliding seat (33). The lower end of the support frame (1) is provided with a drive chamber. The lower end of the screw (32) extends into the inside of the drive chamber. The lower end of the screw (32) is fixedly connected with a driven helical gear. The front end of the drive chamber is rotatably connected with a rotating shaft (34). The front end of the rotating shaft (34) is fixedly connected with a knob (35). The rear end of the rotating shaft (34) is fixedly connected with a driving helical gear. The driving helical gear meshes with the driven helical gear.

3. A support structure for a liquid hydrogen tank as defined in claim 2, characterized in that: The centering adjustment mechanism (3) also includes a support rod (37), a grounding seat (38), and a ground nail (39). The support rod (37) is symmetrically connected to the middle of the adjustment handle (36) through a fixed axis. The lower end of two adjacent support rods (37) is rotatably connected to the grounding seat (38). The end of the grounding seat (38) away from the center of the support frame (1) is slidably connected to the ground nail (39).

4. The support structure for a liquid hydrogen tank according to claim 2, wherein: A bellows (14) is fixedly connected between the top wall of the sliding cavity (31) and the upper surface of the sliding seat (33), and between the bottom wall of the sliding cavity (31) and the lower surface of the sliding seat (33). The bellows (14) are movably sleeved on the outer surface of the screw (32).

5. The support structure for a liquid hydrogen tank according to claim 1, wherein: The lifting mechanism (4) includes a lifting cavity (41), a lifting rod (42), a locking groove (43), a slot (44), a locking plate (45), and a rib (46). The lifting cavities (41) are all located at the upper end of the movable frame (2). The upper end of the movable frame (2) is provided with a locking chamber. The upper and lower ends of the locking chamber are provided with sliding openings. The lifting rod (42) is slidably connected between two vertically adjacent sliding openings and the lifting cavity (41). The left and right sides of the outer surface of the lifting rod (42) are... Each end is provided with a locking groove (43), and each end of the locking chamber away from the center of the support frame (1) is provided with a slot (44). Each slot (44) is fitted with a locking plate (45). Each locking plate (45) is fixedly connected with two ribs (46). Each rib (46) is installed in conjunction with the adjacent locking groove (43). Each lifting rod (42) is fixedly connected with a fixed ball (5). Each fixed ball (5) is rotatably connected to the lower end of the vertically adjacent support plate (6).

6. A support structure for a liquid hydrogen tank as defined in claim 5, characterized in that: The lower end of the lifting rod (42) is fixedly connected to a lifting seat (8), and the lifting seat (8) is slidably connected to the interior of the adjacent lifting chamber (41). The left and right ends of the lifting seat (8) are rotatably connected to a rotating seat (9). The middle part of the rotating seats (9) on the front and rear sides is fixedly connected to a guide cylinder (10), and the middle part of the rotating seats (9) on the left and right sides is fixedly connected to a guide column (11). The outer surface of the guide column (11) is slidably connected to the interior of the adjacent guide cylinder (10).

7. A support structure for a liquid hydrogen tank as defined in claim 6, characterized in that: The lifting seat (8) has symmetrically distributed indicator arrows on the surface away from the center of the support frame (1), and the moving frame (2) has symmetrically distributed scale bars (12) on the surface away from the center of the support frame (1). The indicator arrows are installed in conjunction with the adjacent scale bars (12).

8. The support structure for a liquid hydrogen tank according to claim 1, wherein: The lower ends of the support frame (1) and the four movable frames (2) are all fixedly connected to mounting bases (13), and the interior of the mounting bases (13) is provided with evenly distributed mounting holes.

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