A rocket engine flip mechanism

Abstract

The present invention proposes a rocket engine flipping mechanism, comprising: a support column, a fixed frame, a rotating shaft, a shifting block and a driving device, wherein the support columns are symmetrically arranged at opposite ends of the fixed frame, the fixed frame is used to fix the rocket engine, the sides of the fixed frame close to the support columns are provided with rotating shafts, the rotating shafts abut against the support columns, the fixed frame can rotate around the rotating shafts, the driving device is fixedly installed on one of the support columns, a shifting block is provided on one side of the fixed frame close to the driving device, the driving device is selectively connected to the shifting block in transmission and can drive the fixed frame to rotate around the rotating shaft. The present invention provides a flipping mechanism that is easy to disassemble and adjust the fixed frame, so that it can be suitable for flipping operations of engines of different models.

Description

Technical Field

[0001] The invention relates to the technical field of aviation equipment production, and in particular to a rocket engine flipping mechanism. Background Art

[0002] Rocket engines need to adjust their attitude multiple times during the assembly and transportation process. Rocket engines are mostly assembled in a vertical state. In order to facilitate transportation and delivery, the engine will be flipped horizontally as a whole, which places many requirements on the equipment during the flipping process.

[0003] For example, the way the flip system is fixed to the ground should be as simple as possible to avoid damage to the ground. Secondly, during the flipping process, the engine should remain stable as a whole, the flipping speed should be electrically controlled, and the hovering and locking functions at any angle should be realized during the flipping process. Although there are flipping mechanisms in the prior art that can achieve the above functions, the structure is complex, so it is difficult to expand the application for different models of engines. Summary of the invention

[0004] In view of this, the present invention proposes a rocket engine flipping mechanism with a reasonable structural design.

[0005] The technical solution of the present invention is implemented as follows: The present invention provides a rocket engine flipping mechanism, which includes: a support column, a fixed frame, a rotating shaft, a shift block and a driving device, the support columns are symmetrically arranged at opposite ends of the fixed frame, the fixed frame is used to fix the rocket engine, the sides of the fixed frame close to the support columns are provided with rotating shafts, the rotating shafts abut against the support columns, the fixed frame can rotate around the rotating shaft, the driving device is fixedly installed on one of the support columns, and a shift block is provided on the side of the fixed frame close to the driving device, the driving device is selectively connected to the shift block in transmission and can drive the fixed frame to rotate around the rotating shaft.

[0006] On the basis of the above technical scheme, preferably, the driving device includes a driving mechanism, a rotating mechanism and a lever, the rotating mechanism is rotatably connected to one of the support columns, the rotating shaft of the rotating mechanism is coaxial with the rotation axis, the driving mechanism is fixedly mounted on the support column, the driving mechanism drives the rotating mechanism to rotate, the lever is rotatably mounted on a side of the rotating mechanism close to the fixed frame, the rotating shaft of the lever is parallel to the rotation axis, a through groove is provided at one end of the lever close to the fixed frame, the lever block is located on the rotation trajectory of the lever, and the angle of the lever relative to the rotation mechanism can be adjusted so that the lever block can selectively pass through the through groove or be blocked by the lever.

[0007] On the basis of the above technical solution, preferably, the rotating mechanism includes a turntable and a gear ring. The turntable is rotatably mounted on a support column. A gear ring is installed on the edge of the turntable. The gear ring is coaxially arranged with the rotating shaft of the turntable, and the driving end of the driving mechanism is meshed with the gear ring.

[0008] On the basis of the above technical solution, preferably, the driving mechanism is a worm gear reducer.

[0009] More preferably, it also includes a limit fixing seat and a limit block. The limit fixing seat is fixedly mounted on a support column on which a rotating mechanism is installed. There are two limit blocks. The two limit blocks are respectively fixedly mounted at different positions on a side of the turntable close to the limit fixing seat. During the rotation of the turntable, the two limit blocks can be optionally respectively abutted against two opposite side surfaces of the limit fixing seat.

[0010] On the basis of the above technical solution, preferably, it also includes an operating rod and a locking pin, one end of the operating rod is fixedly connected to the surface of the lever, and the operating rod is perpendicular to the rotating axis of the lever, the locking pin is perpendicular to the surface of the rotating mechanism, a screw hole is provided on the rotating mechanism, and two countersunk holes are provided at one end of the lever close to the rotating mechanism, the locking pin passes through the screw hole and is selectively embedded in the countersunk hole, and the locking pin is embedded in two different countersunk holes, so that the lever block can selectively pass through the through slot or be blocked by the lever.

[0011] On the basis of the above technical solution, preferably, it also includes a support seat and rollers, the support seat is fixedly mounted on the surface of the support column, the two rollers are rotatably mounted on the side of the support seat close to the fixed frame, the rotating shafts of the two rollers are parallel to the rotation axis, the rotating shafts of the two rollers are on the same horizontal plane, the two rollers are spaced apart and the minimum spacing between the surfaces of the two rollers is less than the diameter of the rotation axis, and the rotation axis is rollingly arranged between the two rollers.

[0012] On the basis of the above technical solution, preferably, a guide groove is opened on one side of the support seat close to the fixed frame in the vertical direction upward, the rollers are respectively arranged on both sides of the guide groove in the horizontal direction, and the rotating shaft is embedded in the guide groove.

[0013] On the basis of the above technical solution, preferably, the side surfaces of the fixed frame close to the support columns are provided with a plurality of through holes along a linear array, and the rotating shaft and the shifting block are selectively embedded and rotatably mounted in different through holes.

[0014] On the basis of the above technical solution, preferably, it also includes a diagonal rod and a limit column, wherein the limit column is arranged on the side of the support column close to the fixed frame, and each limit column is detachably connected with at least two diagonal rods, and one end of the two diagonal rods away from the limit column is respectively fastened to different positions on the support column on the side where the limit column is located.

[0015] The rocket engine flipping mechanism of the present invention has the following beneficial effects compared with the prior art:

[0016] (1) The rocket engine flipping mechanism of the present invention is supported by a fixed frame and a support column, which are rotatably connected by a rotating shaft. The fixed frame is driven to rotate by a driving device to achieve attitude adjustment. The structure is simple, and the fixed frame can be easily replaced or changed to adapt to the flipping of satellites of different models.

[0017] (2) In order to make the rocket engine flipping mechanism of the present invention adaptable to different engines, the driving structure is also improved. The fixed frame and the driving device are connected by an easily disassembled plug-in method, and the switching between plug-in and separation is simple. The mode switching can be achieved by manually adjusting the angle of the lever relative to the rotating mechanism.

[0018] (3) Furthermore, in order to achieve stable flipping drive, the present invention adopts a worm gear reducer for rotational drive, and drives by meshing the gear ring and the output end of the reducer. Specifically, the gear ring can adopt a Kamo roller gear ring, which can eliminate the meshing clearance, ensure the accuracy of the flipping angle, and have a certain self-locking function;

[0019] (4) The positions of the rotating shaft and the shifting block on the fixed frame of the present invention can be adjusted and replaced, so that the position of the fixed frame relative to the support column can be easily adjusted to adapt to different models of rocket engines;

[0020] (5) The present invention also uses a diagonal rod structure and a limit column to temporarily fix the fixed frame in position to ensure the stability of the posture during the flipping process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is an axonometric view of the rocket engine flipping mechanism of the present invention;

[0023] Figure 2 for Figure 1 Exploded diagram of

[0024] Figure 3 It is an axonometric view of the rocket engine flipping mechanism of the present invention;

[0025] Figure 4 It is an axonometric view of the inclined tie rod in the rocket engine flipping mechanism of the present invention;

[0026] Figure 5It is a partial exploded view of the driving device part in the rocket engine flipping mechanism of the present invention.

[0027] In the figure: 1-support column, 2-fixed frame, 3-rotating axis, 4-shift block, 5-driving device, 6-limiting fixed seat, 7-limiting block, 8-operating lever, 9-locking latch, 10-support seat, 11-roller, 12-oblique pull rod, 13-limiting column, 51-driving mechanism, 52-rotating mechanism, 53-shift rod, 521-turntable, 522-gear ring, 523-screw hole, 531-through groove, 532-countersunk hole, 101-guide groove, 21-through hole. DETAILED DESCRIPTION

[0028] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] like Figure 1 As shown, combined Figure 2-5 The rocket engine flipping mechanism of the present invention includes a support column 1, a fixed frame 2, a rotating shaft 3, a shift block 4 and a driving device 5. The support column 1 is symmetrically arranged at opposite ends of the fixed frame 2. The fixed frame 2 is used to fix the rocket engine. The side of the fixed frame 2 close to the support column 1 is provided with a rotating shaft 3. The rotating shaft 3 abuts on the support column 1. The fixed frame 2 can rotate around the rotating shaft 3. The driving device 5 is fixedly installed on one of the support columns 1. A shift block 4 is provided on the side of the fixed frame 2 close to the driving device 5. The driving device 5 is selectively connected to the shift block 4 and can drive the fixed frame 2 to rotate around the rotating shaft 3.

[0030] In the above embodiment, the support column 1 is symmetrically arranged at the opposite ends of the fixed frame 2, and the rotating shaft 3 and the shift block 4 are installed on the two side surfaces of the fixed frame 2 facing the support column. In a stable state, the rotating shaft 3 is abutted against the upper surface of the support column 1, and the shift block 4 is located directly above or directly below the rotating shaft 3. The driving device 5 is installed on the surface of one of the support columns 1. The driving device 5 selectively cooperates with the shift block 4 and drives the shift block 4 to rotate around the rotating shaft 3, thereby driving the fixed frame 2 to rotate. The rotating shaft 3 is abutted against the surface of the support column 1 under the action of the gravity of the fixed frame 2. Preferably, the length direction of the rotating shaft 3 is horizontally arranged.

[0031] In the above embodiments, the fixed frame 2 can be directly lifted by the equipment therein and separated from the support column 1 to achieve replacement, disassembly or adjustment.

[0032] In a specific embodiment, the driving device 5 includes a driving mechanism 51, a rotating mechanism 52 and a lever 53. The rotating mechanism 52 is rotatably connected to one of the support columns 1. The rotating shaft of the rotating mechanism 52 is coaxial with the rotating shaft 3. The driving mechanism 51 is fixedly installed on the support column 1. The driving mechanism 51 drives the rotating mechanism 52 to rotate. The lever 53 is rotatably installed on a side of the rotating mechanism 52 close to the fixed frame 2. The rotating shaft of the lever 53 is parallel to the rotating shaft 3. A through groove 531 is provided at one end of the lever 53 close to the fixed frame 2. The lever block 4 is located on the rotating trajectory of the lever 53. By adjusting the angle of the lever 53 relative to the rotating mechanism 52, the lever block 4 can selectively pass through the through groove 531 or be blocked by the lever 53.

[0033] In the above embodiment, the rotating mechanism 52 is selectively connected to the shift block 4 through the shift rod 53, and the rotating shaft of the rotating mechanism 52 is coaxial with the rotating shaft 3. Therefore, when the rotating mechanism 52 is connected to the shift block 4, if the rotating mechanism 52 rotates, the fixed frame 2 can be driven to rotate accordingly. Specifically, the shift block 4 protrudes from the surface of the fixed frame 2 and is arranged toward the support column 1, and the end of the shift rod 53 close to the fixed frame 2 is provided with a through groove 531 along the radial direction of the shift rod 53. Therefore, when the rotating mechanism 52 keeps its position unchanged, the rotating mechanism 52 is rotated. When the lever 53 is moved, the opening direction of the through slot 531 changes accordingly. There is an angle of the lever 53 that allows the shift block 4 to smoothly pass through the through slot 531 when the rotating mechanism 52 rotates. If the lever 53 is not at this specific angle, the shift block 4 will abut against the outer surface of the lever 53 during the rotation of the rotating mechanism 52. When the lever 53 is at the specific angle and the rotating mechanism 52 rotates until the shift block 4 is embedded in the through slot 531, the lever 53 is rotated in this state, so that the shift block 4 can be fixed relative to the lever 53.

[0034] The above embodiment provides a solution in which the fixed frame 2 can be disassembled and selectively fixed relative to the support column 1 and can be driven to rotate. With this solution, the fixed frame 2 can be easily replaced to adapt to the flipping of satellites of different models.

[0035] In a specific embodiment, the rotating mechanism 52 includes a turntable 521 and a ring gear 522. The turntable 521 is rotatably mounted on the support column 1. The ring gear 522 is installed on the edge of the turntable 521. The ring gear 522 is coaxially arranged with the rotating shaft of the turntable 521. The driving end of the driving mechanism 51 is engaged with the ring gear 522.

[0036] In the above embodiments, preferably, the gear ring 522 is a Kamo roller gear ring, which is driven to rotate by the driving mechanism 51, and the gear ring 522 is transmitted, which is convenient for angle locking, and the Kamo roller gear ring can eliminate the meshing clearance, which is conducive to precise angle control.

[0037] In a specific embodiment, the driving mechanism 51 is a worm gear reducer with a self-locking function.

[0038] In the above embodiments, the worm gear reducer is used to drive the rotating mechanism 52 to rotate, and also has a self-locking capability and high safety performance.

[0039] In a specific embodiment, it also includes a limit fixing seat 6 and a limit block 7. The limit fixing seat 6 is fixedly installed on the support column 1 on which the rotating mechanism 52 is installed. The number of the limit blocks 7 is two. The two limit blocks 7 are respectively fixedly installed at different positions on a side of the turntable 521 close to the limit fixing seat 6. During the rotation of the turntable 521, the two limit blocks 7 can be optionally respectively abutted against the two opposite side surfaces of the limit fixing seat 6.

[0040] In the above implementation manner, the target flipping angle is between 0-90°, so the rotation angle of the rotating mechanism 52 needs to be limited. If the rotation angle exceeds the limit, the fixed frame 2 may not be able to remain stable. In order to achieve the angle limit, two limit blocks 7 are respectively installed at corresponding positions on the surface of the turntable 521. The limit blocks 7 are used to cooperate with the limit fixing seat 6 for limiting. Specifically, when the shift block 4 and the shift rod 53 are connected in transmission, the fixed frame 2 remains in a natural state and the engine fixed thereon is in a vertical state. At this time, one of the limit blocks 7 is against one side surface of the limit fixing seat 6. When the fixed frame 2 is flipped over to the horizontal state of the engine, the other limit block is against the other side surface of the limit fixing seat 6. The angle between the two limit blocks 7 and the line connecting the rotation axis does not exceed 90°.

[0041] In a specific embodiment, it also includes an operating rod 8 and a locking pin 9, one end of the operating rod 8 is fixedly connected to the surface of the shift rod 53, and the operating rod 8 is perpendicular to the rotating axis of the shift rod 53, the locking pin 9 is perpendicular to the surface of the rotating mechanism 52, a screw hole 523 is provided on the rotating mechanism 52, and two countersunk holes 532 are provided at one end of the shift rod 53 close to the rotating mechanism 52, the locking pin 9 passes through the screw hole 523 and is selectively embedded in the countersunk hole 532, and the locking pin 9 is embedded in two different countersunk holes 532, so that the shift block 4 can selectively pass through the through slot 531 or be blocked by the shift rod 53.

[0042] In the above embodiment, the operating rod 8 is used to assist in operating the adjustment of the rotation angle of the lever 53, and the locking pin 9 is used to limit and fix the position of the lever 53. Specifically, the locking pin 9 is threadedly connected to the screw hole 523 at the upper end of the rotating mechanism 52. When the locking pin 9 rotates relative to the screw hole 532, the distance between the end of the locking pin 9 and the turntable 521 changes, and it can be selectively embedded in the countersunk hole 532, thereby realizing the switching of the rotating mechanism 52 relative to the lever 53 between locking and unlocking.

[0043] In a specific embodiment, it also includes a support seat 10 and a roller 11. The support seat 10 is fixedly installed on the surface of the support column 1, and the two rollers 11 are rotatably installed on the side of the support seat 10 close to the fixed frame 2. The rotating axes of the two rollers 11 are parallel to the rotating axis 3, and the rotating axes of the two rollers 11 are on the same horizontal plane. The two rollers 11 are arranged at intervals and the minimum spacing between the surfaces of the two rollers 11 is less than the diameter of the rotating axis 3, and the rotating axis 3 is rollingly arranged between the two rollers 11.

[0044] In the above embodiment, in order to reduce the friction between the fixed frame 2 and the support column 1 during the rotation process, two rollers 11 are used as a supporting structure. Preferably, the rollers 11 are track rollers with strong bearing capacity and good reliability. The two rollers 11, as a supporting rolling contact structure, also have a certain limiting effect, which can prevent the rotating shaft 3 from being separated from the connection position during rotation.

[0045] In a specific embodiment, a guide groove 101 is opened upward along the vertical direction on one side of the support seat 10 close to the fixed frame 2 , and the rollers 11 are respectively arranged on both sides of the guide groove 101 along the horizontal direction, and the rotating shaft is embedded in the guide groove 101 .

[0046] In the above implementation mode, since the limiting effect of the roller 11 is limited, its limiting effect is mainly formed by the centripetal support formed by the tangential inclined surface of the contact surface between the roller 11 and the rotating shaft 3. Therefore, the limiting effect is affected by the inclination of the inclined surface. However, when the inclination of the inclined surface is too large, the rotating shaft 3 is likely to generate a horizontal reverse force on the two rollers, which ultimately makes the supporting force on the rotating shaft 3 weak, which easily leads to problems such as excessive friction and falling. The present application directly forms a horizontal position limit for the rotating shaft 3 by setting a guide groove 101.

[0047] In a specific embodiment, a plurality of through holes 21 are formed along a linear array on the side surface of the fixed frame 2 close to the support column 1 , and the rotating shaft 3 and the shifting block 4 are selectively embedded and rotatably mounted in different through holes 21 .

[0048] In the above embodiment, the rotating shaft 3 and the shift block 4 are embedded in the through hole 21, so that the position of the rotating shaft 3 of the fixed frame 2 can be adjusted to adapt to the installation and flipping of engines of different sizes. Since the center of gravity of engines of different sizes are different, when the axial direction of the rotating shaft 3 is close to or coincides with the center of gravity of the engine, the torque generated by gravity when the fixed frame 2 is flipped is smaller, and flipping is easier. Compared with directly replacing the fixed frame 2, the above implementation scheme can greatly reduce the use of tooling and fixtures, and improve the utilization rate of the same type of fixed frame 2.

[0049] In a specific embodiment, it also includes an inclined rod 12 and a limiting column 13, wherein the limiting column 13 is arranged on a side of the support column 1 close to the fixed frame 2, and each limiting column 13 is detachably connected with at least two inclined rods 12, and one end of the two inclined rods 12 away from the limiting column 13 is respectively fastened to different positions on the support column 1 on the side where the limiting column 13 is located.

[0050] In the above embodiment, the diagonal tie rod 12 is a telescopic nut rod, and the length of the diagonal tie rod 12 can be adjusted. According to the flipping angle of the fixed frame 2, the lengths of multiple diagonal tie rods 12 are adjusted, so that the corresponding fixed frame 2 and the support column 1 are rigidly connected through at least two diagonal tie rods 12 to achieve position fixation. Specifically, the ends of the diagonal tie rod 12 are respectively fastened to the surface of the support column 1 and the limit column 13 on the fixed frame 2, which can be a specific compression interference fit. More specifically, a limit ring is provided at the end of the diagonal tie rod 12, and a screw hole can be opened on the surface of the support column 1 by limiting and fixing the limit column 13 with the limit ring. The limit ring at the end of the diagonal tie rod 12 is penetrated by a bolt and screwed into the screw hole to achieve a fastening connection with the support column 1.

[0051] The above description is only a preferred embodiment of the present invention and is 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 protection scope of the present invention.

Claims

1. A rocket engine flipping mechanism, characterized in that: include: A support column (1), a fixed frame (2), a rotating shaft (3), a shifting block (4) and a driving device (5), wherein the support column (1) is symmetrically arranged at two opposite ends of the fixed frame (2), the fixed frame (2) is used to fix a rocket engine, the fixed frame (2) is provided with a rotating shaft (3) on the side close to the support column (1), the rotating shaft (3) abuts against the support column (1), the fixed frame (2) can rotate around the rotating shaft (3), the driving device (5) is fixedly mounted on one of the support columns (1), a shifting block (4) is provided on one side of the fixed frame (2) close to the driving device (5), and the driving device (5) is selectively connected to the shifting block (4) in transmission and can drive the fixed frame (2) to rotate around the rotating shaft (3); The driving device (5) comprises a driving mechanism (51), a rotating mechanism (52) and a lever (53); the rotating mechanism (52) is rotatably connected to one of the supporting columns (1); the rotating shaft of the rotating mechanism (52) is coaxial with the rotating shaft (3); the driving mechanism (51) is fixedly mounted on the supporting column (1); the driving mechanism (51) drives the rotating mechanism (52) to rotate; the lever (53) is rotatably mounted on a side of the rotating mechanism (52) close to the fixed frame (2); the rotating shaft of the lever (53) is parallel to the rotating shaft (3); a through slot (531) is provided at one end of the lever (53) close to the fixed frame (2); the lever block (4) is located on the rotating track of the lever (53); by adjusting the angle of the lever (53) relative to the rotating mechanism (52), the lever block (4) can selectively pass through the through slot (531) or be blocked by the lever (53); The side surfaces of the fixed frame (2) close to the support column (1) are provided with a plurality of through holes (21) along a linear array, and the rotating shaft (3) and the shifting block (4) are selectively embedded and rotatably mounted in different through holes (21).

2. The rocket engine flipping mechanism according to claim 1, characterized in that: The rotating mechanism (52) comprises a rotating disk (521) and a gear ring (522). The rotating disk (521) is rotatably mounted on the support column (1). The edge of the rotating disk (521) is provided with a gear ring (522). The gear ring (522) is coaxially arranged with the rotating shaft of the rotating disk (521). The driving end of the driving mechanism (51) is meshed with the gear ring (522).

3. The rocket engine flipping mechanism according to claim 2, characterized in that: The driving mechanism (51) is a worm gear reducer with a self-locking function.

4. The rocket engine flipping mechanism according to claim 2, characterized in that: The invention also comprises a limit fixing seat (6) and a limit block (7). The limit fixing seat (6) is fixedly mounted on a support column (1) on which a rotating mechanism (52) is mounted. There are two limit blocks (7). The two limit blocks (7) are respectively fixedly mounted at different positions on a side of the rotating disk (521) close to the limit fixing seat (6). During the rotation of the rotating disk (521), the two limit blocks (7) can be optionally respectively abutted against two opposite side surfaces of the limit fixing seat (6).

5. The rocket engine flipping mechanism according to claim 1, characterized in that: The invention also comprises a locking latch (9), a screw hole (523) is provided on the rotating mechanism (52), two countersunk holes (532) are provided on one end of the shifting rod (53) close to the rotating mechanism (52), the locking latch (9) passes through the screw hole (523) and is selectively embedded in the countersunk hole (532), and the locking latch (9) is embedded in two different countersunk holes (532), so that the shifting block (4) can selectively pass through the through slot (531) or be blocked by the shifting rod (53).

6. The rocket engine flipping mechanism according to claim 1, characterized in that: The invention also comprises a support seat (10) and a roller (11), wherein the support seat (10) is fixedly mounted on the surface of the support column (1), and two rollers (11) are rotatably mounted on a side of the support seat (10) close to the fixed frame (2), the rotating shafts of the two rollers (11) are parallel to the rotating shaft (3), the rotating shafts of the two rollers (11) are on the same horizontal plane, the two rollers (11) are arranged at intervals, and the minimum spacing between the surfaces of the two rollers (11) is smaller than the diameter of the rotating shaft (3), and the rotating shaft (3) is rollingly arranged between the two rollers (11).

7. The rocket engine flipping mechanism according to claim 6, characterized in that: A guide groove (101) is provided on one side of the support seat (10) close to the fixed frame (2) in a vertically upward direction, the rollers (11) are respectively arranged on both sides of the guide groove (101) in a horizontal direction, and the rotating shaft is embedded in the guide groove (101).

8. The rocket engine flipping mechanism according to claim 1, characterized in that: It also includes an inclined rod (12) and a limiting column (13), wherein the limiting column (13) is arranged on a side of the support column (1) close to the fixed frame (2), and each limiting column (13) is detachably connected to at least two inclined rods (12), and one end of the two inclined rods (12) away from the limiting column (13) is respectively fastened to different positions on the support column (1) on the side where the limiting column (13) is located.

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