Movable telescopic support tool for compressor housing installation

CN224738137UActive Publication Date: 2026-09-11PROCOMP ENERGY MASCH (MAANSHAN) CO LTD
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Patent Information

Application Number
CN202522124745.5
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-10-09
Publication Date
2026-09-11
Estimated Expiration
2035-10-09

AI Technical Summary

Technical Problem

[0005]本实用新型的目的是为了解决现有技术中存在的缺点,提供一种集高度可调、便捷移动、自主供电与集成照明于一体的专用支撑工装,从而避免压缩机外罩安装作业效率低、安全性不足、适应性差的情况,以满足现代工业安装维护的需求的压缩机外罩安装用可移动式伸缩支撑工装

Benefits of technology

[0011]与现有技术相比,本实用新型的优点和积极效果在于,

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides a movable telescopic support frock for compressor housing installation relates to compressor housing installation equipment technical field. Including support column, the top of support column is connected with telescopic slide rod, by setting up support column, support base plate, field auxiliary mechanism and bottom support moving mechanism, the telescopic slide rod in its interior can realize the wide range adjustment of initial height through sliding, provides sufficient illumination for work area, and the stable connection is ensured to limiting bandage and fixed disc, by the second location bolt on the screwing auxiliary support seat, make it and the ground close contact, thereby reinforcing treatment when the lateral reinforcement support plate and support column are connected, the whole frock realizes accurate support through mechanical telescopic, and the on -the -spot power supply and lighting problem are solved using solar energy system, and have convenient movement and stable locking ability, greatly promote the efficiency, security and environmental adaptability of compressor housing installation operation, improve the use flexibility of equipment.
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Description

Technical Field

[0001] This utility model relates to the technical field of compressor housing installation equipment, and in particular to a movable telescopic support fixture for compressor housing installation. Background Technology

[0002] In the field of industrial equipment installation and maintenance, compressors, as core power equipment, typically require installation, commissioning, and maintenance of their casings at high altitudes or specific angles.

[0003] In practice, existing technologies for supporting the installation of enclosures mostly rely on fixed supports or simple scaffolding, which presents the following problems: Fixed brackets cannot be flexibly adjusted according to site space and installation height, resulting in poor applicability; Most existing support equipment lacks mobility and needs to be completely disassembled and reassembled when moving between large factories or different workstations, which is inefficient and increases labor intensity. Inconvenient power supply during outdoor operations is also a major factor restricting work efficiency, resulting in many inconveniences.

[0004] Therefore, this utility model provides a movable telescopic support fixture for installing a compressor cover. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a special support fixture that integrates height adjustment, convenient movement, self-powered power supply and integrated lighting, thereby avoiding the problems of low efficiency, insufficient safety and poor adaptability in compressor cover installation, and meeting the needs of modern industrial installation and maintenance.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a movable telescopic support fixture for installing a compressor cover, including a support column. The top of the support column is slidably connected to a telescopic slide rod, and a first positioning bolt that cooperates with the telescopic slide rod for limiting is installed on one side of the support column. The top of the telescopic slide rod is threadedly connected to a mounting screw, and an adjusting slider is threadedly connected to the outer side of the mounting screw. Both sides of the adjusting slider are fixedly connected to a handle. A field auxiliary mechanism is installed on one side of the telescopic slide rod. This mechanism includes a mounting frame. An adjusting sleeve is fitted over the outer side of the telescopic slide rod. A limit strap is installed on one side of the adjusting sleeve. A battery storage compartment is fixedly connected inside the limit strap. A mounting frame is fixedly connected to the top of the battery storage compartment. A solar panel is fixedly connected inside the mounting frame. Light mounting brackets are installed inside the mounting frame, both above and below the solar panel. Lighting lamps are fixedly connected inside each light mounting bracket. These lamps provide auxiliary lighting during on-site operations, facilitating nighttime work. When the entire equipment needs to be used outdoors… During operation, the device is driven by the wheels at the bottom to move to the required work location. When sunlight shines on the solar panels, the photosensitive materials in the solar panels absorb the light energy, excite electrons and generate current. This current is collected by integrated circuits and converted into direct current, which is then stored in a battery storage compartment. The battery storage compartment is equipped with a charging controller and an inverter. The charging controller manages the electrical energy generated by the solar panels and regulates the voltage and current to ensure the safe charging of the batteries. Finally, the inverter converts the direct current into alternating current that can be used by some electrical equipment, thus achieving a certain degree of self-sufficiency in power resources and saving on-site operation costs. A bottom support moving mechanism is installed on the outer side of the bottom of the support column. The bottom support moving mechanism includes two side reinforcement plates. Side reinforcement plates are installed on both sides of the bottom of the support column. A connecting plate is fixedly connected between the two side reinforcement plates and on one side of the support column. Two symmetrically distributed positioning plates are fixedly connected to the side of the connecting plate away from the support column. Moving wheels are fixedly connected to the bottom of the two positioning plates. Auxiliary support seats are fixedly connected to the bottom of the two side reinforcement plates. Second positioning bolts are threaded into the interior of the two auxiliary support seats. The auxiliary support seats and the work site are positioned and installed by the second positioning bolts, thereby improving the stability of the overall equipment operation.

[0007] In a preferred embodiment, a top limiting plate is installed at the top end of the mounting screw; a second limiting sleeve is fixedly connected to the outer side of the telescopic slide rod and below the adjusting slider; a first limiting sleeve is fixedly connected to the outer side of the support column and below the field auxiliary mechanism; a first positioning bolt is located outside the first limiting sleeve and is used for positioning the support column and the telescopic slide rod; the second limiting sleeve is used to limit the downward movement of the adjusting slider; the first limiting sleeve is used to limit the top movement of the downward-sloping adjusting slide; symmetrically distributed limiting plates are fixedly connected to the outer side of the mounting frame and on both sides of the solar panel; the side of the two limiting plates that are close to each other is fixedly connected to the corresponding lamp mounting bracket; and one side of each lamp mounting bracket is threaded with a mating... The fourth positioning bolt, corresponding to the lighting lamp limit, is used to position the lamp mounting bracket and mounting frame during installation via two limit plates. The fourth positioning bolt reinforces the connection between the lighting lamp and the lamp mounting bracket, thereby improving the stability of some equipment installations. One side of the adjusting sleeve is fixedly connected to equidistantly distributed fixing plates, and one side of each fixing plate is fixedly connected to a fixing disc. One side of each fixing disc is fixedly connected to a limit strap. The adjusting sleeve has an internal installation cavity for mounting with a telescopic sliding rod. The outer side of the adjusting sleeve is threaded with symmetrically distributed fifth positioning bolts extending into the telescopic sliding rod. These fifth positioning bolts position the adjusting sleeve and telescopic sliding rod after height adjustment, thereby improving the flexibility of equipment use.

[0008] In a preferred embodiment, a wireless transceiver is fixedly connected to the side of the mounting frame away from the solar panel. A main control board is fixedly connected inside the wireless transceiver, and a control chip is fixedly connected to the outside of the main control board. The control chip is used to control the operation of the solar panel, lighting, wireless transceiver, and energy storage compartment, which are all electrically connected to the control chip, thereby realizing unified management of power equipment.

[0009] In a preferred embodiment, each of the two side reinforcement plates has a mounting hole on the side closest to the support column. A positioning rod that can be inserted into the support column can be installed inside the mounting hole to reinforce the connection between the side reinforcement plate and the support column.

[0010] In a preferred embodiment, the bottom of each of the two side reinforcement plates is fixedly connected to a support base plate, the bottom of the support column is fixedly connected to the top of the support base plate, and the internal thread of the support base plate is connected with equally spaced third positioning bolts. The support base plate and the work site are positioned and installed by multiple third positioning bolts, thereby improving the secondary stability of the overall equipment operation.

[0011] Compared with the prior art, the advantages and positive effects of this utility model are as follows: By setting up support columns, support base plates, on-site auxiliary mechanisms, and bottom support moving mechanisms, the support columns serve as the main load-bearing structure during use. Their internal telescopic slide rods allow for a wide range of initial height adjustments, providing ample lighting to the work area. Limit straps and fixing discs ensure stable connections. The bottom moving wheels allow the tooling to be easily pushed to any working position by a single person. Once in the designated position, tightening the second positioning bolt on the auxiliary support base ensures tight contact with the ground, forming a stable support. The third positioning bolt on the support base plate further secures it to the ground, achieving secondary stability and ensuring absolute safety under load or when torque is applied. The second limit sleeve is used to adjust the slider. During the downward movement, the device is limited. The first limiting sleeve is used to limit the top of the adjusting sleeve during the downward movement. Two limiting plates are used to position the lamp mounting bracket and mounting frame during installation. The fourth positioning bolt is used to reinforce the connection between the lighting lamp and the lamp mounting bracket, thereby improving the stability of the installation of some equipment. Positioning rods that can be inserted into the support column can be installed inside the mounting holes, thereby reinforcing the connection between the side reinforcement plate and the support column. The overall tooling achieves precise support through mechanical telescopic movement. The solar energy system solves the on-site power supply and lighting problems, and has convenient movement and stable locking capabilities. This greatly improves the efficiency, safety, and environmental adaptability of the compressor cover installation operation, and enhances the flexibility of equipment use. Attached Figure Description

[0012] Figure 1 A schematic diagram of the overall structure of a movable telescopic support fixture for installing a compressor housing provided by this utility model. Figure 1 ; Figure 2 A schematic diagram of the overall structure of a movable telescopic support fixture for installing a compressor housing provided by this utility model. Figure 2 ; Figure 3 Enlarged schematic diagram of the on-site auxiliary mechanism for a movable telescopic support fixture for installing a compressor housing provided by this utility model. Figure 1 ; Figure 4 Enlarged schematic diagram of the on-site auxiliary mechanism for a movable telescopic support fixture for installing a compressor housing provided by this utility model. Figure 2 ; Figure 5 An enlarged schematic diagram of the bottom support moving mechanism of a movable telescopic support fixture for installing a compressor cover provided by this utility model.

[0013] Legend: 1. Support column; 11. First limiting sleeve; 12. First positioning bolt; 13. Telescopic slide rod; 14. Second limiting sleeve; 15. Adjusting slider; 16. Handle; 17. Mounting screw; 18. Top limiting plate; 2. Support base plate; 21. Side reinforcement support plate; 22. Mounting hole; 23. Connecting plate; 24. Positioning plate; 25. Casters; 26. Auxiliary support base; 27. Second positioning bolt; 28. Third positioning bolt; 3. Mounting frame; 31. Solar panel; 32. Limiting plate; 33. Lamp mounting bracket; 34. Lighting lamp; 35. Fourth positioning bolt; 36. Wireless transceiver; 4. Adjusting the sliding sleeve; 41. Installing the inner cavity; 42. Fifth positioning bolt; 43. Fixing the insert plate; 44. Fixing the plate; 45. Limiting strap; 46. Battery compartment. Detailed Implementation

[0014] 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.

[0015] like Figures 1-5 As shown, this embodiment provides a technical solution: a movable telescopic support fixture for installing a compressor cover, including a support column 1, a telescopic slide rod 13 slidably connected to the top of the support column 1, a first positioning bolt 12 that cooperates with the telescopic slide rod 13 for limiting on one side of the support column 1, an installation screw 17 threadedly connected to the top of the telescopic slide rod 13, an adjusting slider 15 threadedly connected to the outer side of the installation screw 17, and a handle 16 fixedly connected to both sides of the adjusting slider 15; In this design, a field auxiliary mechanism is installed on one side of the telescopic slide bar 13. This mechanism includes a mounting frame 3, an adjusting sleeve 4 fitted around the outside of the telescopic slide bar 13, a limiting strap 45 installed on one side of the adjusting sleeve 4, a battery storage compartment 46 fixedly connected inside the limiting strap 45, a mounting frame 3 fixedly connected to the top of the battery storage compartment 46, a solar panel 31 fixedly connected inside the mounting frame 3, and lamp mounting brackets 33 installed inside the mounting frame 3, both above and below the solar panel 31. Lighting lamps 34 are fixedly connected inside each lamp mounting bracket 33. The lighting lamps 34 are used for auxiliary lighting during on-site operations, facilitating nighttime work. When the entire equipment needs to be... When working outdoors, the device is driven by the bottom wheels 25 to move to the required work location. When sunlight shines on the solar panel 31, the photosensitive material in the solar panel 31 absorbs the light energy, excites electrons and generates current. This current is collected by the integrated circuit and converted into direct current, which is then stored in the battery storage compartment 46. The battery storage compartment 46 is equipped with a charging controller and an inverter. The charging controller manages the electrical energy generated by the solar panel 31 and regulates the voltage and current to ensure the safe charging of the battery. Finally, the inverter converts the direct current into alternating current that can be used by some electrical equipment, thus achieving a certain degree of self-sufficiency in power resources and saving on-site operation costs. In this design, a bottom support moving mechanism is installed on the outer side of the bottom of the support column 1. The bottom support moving mechanism includes two side reinforcement plates 21. Side reinforcement plates 21 are installed on both sides of the bottom of the support column 1. A connecting plate 23 is fixedly connected between the two side reinforcement plates 21 and on one side of the support column 1. Two symmetrically distributed positioning plates 24 are fixedly connected to the side of the connecting plate 23 away from the support column 1. Moving wheels 25 are fixedly connected to the bottom of each of the two positioning plates 24. Auxiliary support seats 26 are fixedly connected to the bottom of each of the two side reinforcement plates 21. Second positioning bolts 27 are threaded into the interior of each of the two auxiliary support seats 26. The auxiliary support seats 26 and the work site are positioned and installed by the second positioning bolts 27, thereby improving the overall stability of the equipment operation.

[0016] Going further, such as Figures 1-2 As shown: In this scheme, a top limiting plate 18 is installed at the top end of the mounting screw 17. A second limiting sleeve 14 is fixedly connected to the outside of the telescopic slide rod 13 and below the adjusting slider 15. A first limiting sleeve 11 is fixedly connected to the outside of the support column 1 and below the field auxiliary mechanism. The first positioning bolt 12 is located outside the first limiting sleeve 11 and is used for positioning the support column 1 and the telescopic slide rod 13. The second limiting sleeve 14 is used to limit the downward movement of the adjusting slider 15. The first limiting sleeve 11 is used to limit the top movement of the downward adjusting slide 4.

[0017] Going further, such as Figures 1-4As shown: In this scheme, symmetrically distributed limiting plates 32 are fixedly connected to the outer side of the mounting frame 3 and on both sides of the solar panel 31. The side of the two limiting plates 32 that are close to each other is fixedly connected to the corresponding lamp mounting bracket 33. The side of the lamp mounting bracket 33 is threaded with a fourth positioning bolt 35 that matches the positioning of the corresponding lighting lamp 34. The two limiting plates 32 are used to position the lamp mounting bracket 33 and the mounting frame 3 during installation. The fourth positioning bolt 35 is used to reinforce the connection between the lighting lamp 34 and the lamp mounting bracket 33, thereby improving the stability of the installation of some equipment.

[0018] Going further, such as Figures 1-5 As shown, in this scheme, one side of the adjusting sleeve 4 is fixedly connected with equidistantly distributed fixed insert plates 43, and one side of each fixed insert plate 43 is fixedly connected with a fixed plate 44. One side of the fixed plate 44 is fixedly connected with a limiting strap 45. The interior of the adjusting sleeve 4 is provided with an installation cavity 41 for mounting with the telescopic slide rod 13. The outer side of the adjusting sleeve 4 is threaded with symmetrically distributed fifth positioning bolts 42 that extend into the interior of the telescopic slide rod 13. The fifth positioning bolts 42 are used to position the adjusting sleeve 4 and the telescopic slide rod 13 after the height adjustment is completed, thereby improving the flexibility of the equipment.

[0019] In this scheme, a wireless transceiver 36 is fixedly connected to the side of the mounting frame 3 away from the solar panel 31. A main control board is fixedly connected inside the wireless transceiver 36, and a control chip is fixedly connected to the outside of the main control board. The control chip is used to control the operation of the solar panel 31, the lighting lamp 34, the wireless transceiver 36, and the energy storage compartment 46, all of which are electrically connected to the control chip. The control chip is used to control the operation of the solar panel 31, the lighting lamp 34, the wireless transceiver 36, and the energy storage compartment 46, thus realizing unified management of power equipment.

[0020] Going further, such as Figures 1-5 As shown in the figure, in this scheme, the two side reinforcement plates 21 are provided with mounting holes 22 on the side close to the support column 1. The mounting holes 22 can be used to install positioning rods that can be inserted into the support column 1, thereby strengthening the connection between the side reinforcement plates 21 and the support column 1.

[0021] In this scheme, the bottom of the two side reinforcement plates 21 are fixedly connected to the support base plate 2, the bottom of the support column 1 is fixedly connected to the top of the support base plate 2, and the internal thread of the support base plate 2 is connected with the third positioning bolts 28 distributed at equal intervals. The support base plate 2 and the work site are positioned and installed by multiple third positioning bolts 28, thereby improving the secondary stability of the overall equipment operation.

[0022] Working principle: like Figures 1-5 As shown: By setting up a support column 1, a support base plate 2, on-site auxiliary mechanisms, and a bottom support moving mechanism, the support column 1 serves as the main load-bearing structure during use. Its internal telescopic slide rod 13 allows for a wide range of initial height adjustments through sliding. After adjusting to the desired height, initial locking is achieved by tightening the first positioning bolt 12. Further fine adjustments are made through the threaded connection between the mounting screw 17 and the adjusting slider 15. Rotating the handle 16 drives the adjusting slider 15 to move up and down along the mounting screw 17, thereby fine-tuning the height of the support point. The second limit sleeve 14 acts as a safety limit device to prevent the adjusting slider 15 from moving excessively downwards. This dual adjustment mechanism ensures precise support height adjustment. To ensure accurate installation of different compressor housing models, the adjusting sleeve 4 can slide up and down along the telescopic slide rod 13 and is fixed to the optimal lighting position by the fifth positioning bolt 42. The mounting frame 3 on its side houses a solar panel 31. During the day or when there is sufficient sunlight, the solar panel 31 converts light energy into electrical energy. After voltage and current management by the charging controller inside the battery compartment 46, the built-in battery is charged. The inverter converts DC power to AC power for use. During nighttime operation, the control chip can automatically or remotely control the lighting 34 to turn on, providing sufficient illumination for the work area. The limiting strap 45 and fixing plate are also included. 44 ensures a stable connection. The bottom casters 25 allow the tooling to be easily pushed to any working position by a single person. After reaching the designated position, tightening the second positioning bolt 27 on the auxiliary support base 26 ensures close contact with the ground, forming a stable support. The third positioning bolt 28 on the support base plate 2 can further fix it to the ground, achieving secondary stability and ensuring absolute safety when bearing load or applying torque. The second limit sleeve 14 is used to limit the downward movement of the adjusting slider 15, and the first limit sleeve 11 is used to limit the top of the downward adjusting sleeve 4. The two limit plates 32 are used for positioning the lamp mounting bracket 33 and the mounting frame 3 during installation, and the fourth positioning bolt 35 is used for positioning the lamp mounting bracket 33 and the mounting frame 3 during installation. The lighting lamp 34 and lamp mounting bracket 33 are reinforced to improve the stability of some equipment installations. The mounting holes 22 can be used to install positioning rods that can be inserted into the support column 1, thereby reinforcing the connection between the side reinforcement plate 21 and the support column 1. The control chip is used to control the operation of the solar panel 31, lighting lamp 34, wireless transceiver 36 and energy storage compartment 46, realizing unified management of power equipment. The overall tooling achieves precise support through mechanical telescopic movement. The solar system solves the on-site power supply and lighting problems and has convenient movement and stable locking capabilities, which greatly improves the efficiency, safety and environmental adaptability of the compressor cover installation operation and improves the flexibility of equipment use.

[0023] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A movable telescopic support fixture for installing a compressor housing, comprising a support column (1), characterized in that, The top of the support column (1) is slidably connected to a telescopic slide rod (13), the top of the telescopic slide rod (13) is threadedly connected to a mounting screw (17), and the outer side of the mounting screw (17) is threadedly connected to an adjusting slider (15). A field auxiliary mechanism is installed on one side of the telescopic slide rod (13). The field auxiliary mechanism includes a mounting frame (3). An adjusting slide sleeve (4) is fitted on the outside of the telescopic slide rod (13). A limiting strap (45) is installed on one side of the adjusting slide sleeve (4). An energy storage compartment (46) is fixedly connected inside the limiting strap (45). The mounting frame (3) is fixedly connected to the top of the energy storage compartment (46). A solar panel (31) and a lamp mounting bracket (33) are fixedly connected inside the mounting frame (3). A lighting lamp (34) is fixedly connected inside the lamp mounting bracket (33). A bottom support moving mechanism is installed on the outer side of the bottom of the support column (1). The bottom support moving mechanism includes two side reinforcement support plates (21). A connecting plate (23) is fixedly connected between the two side reinforcement support plates (21) and on one side of the support column (1). Two symmetrically distributed positioning plates (24) are fixedly connected on the side of the connecting plate (23) away from the support column (1). A moving wheel (25) is fixedly connected to the bottom of each of the two positioning plates (24). An auxiliary support seat (26) is fixedly connected to the bottom of each of the two side reinforcement support plates (21).

2. The movable telescopic support tool for compressor housing installation according to claim 1, characterized in that: A first positioning bolt (12) is installed on one side of the support column (1) to limit the telescopic slide rod (13). A handle (16) is fixedly connected to both sides of the adjusting slider (15). A top limiting plate (18) is installed at the top end of the mounting screw (17). A second limiting sleeve (14) is fixedly connected to the outside of the telescopic slide rod (13) and below the adjusting slider (15). A first limiting sleeve (11) is fixedly connected to the outside of the support column (1) and below the field auxiliary mechanism.

3. The mobile telescopic support tool for compressor housing mounting according to claim 1, wherein: On the outside of the mounting frame (3) and on both sides of the solar panel (31), there are symmetrically distributed limiting plates (32). The side of the two limiting plates (32) that are close to each other is fixedly connected to the corresponding lamp mounting bracket (33). The side of the lamp mounting bracket (33) is threaded with a fourth positioning bolt (35) that cooperates with the limiting of the corresponding lighting lamp (34).

4. The mobile telescopic support tool for compressor housing mounting according to claim 3, characterized in that: One side of the adjusting sleeve (4) is fixedly connected to a fixed insert plate (43) that is evenly distributed. One side of each fixed insert plate (43) is fixedly connected to a fixed disc (44). One side of the fixed disc (44) is fixedly connected to a limiting strap (45). The interior of the adjusting sleeve (4) is provided with an installation cavity (41) for mounting the telescopic slide rod (13). The outer side of the adjusting sleeve (4) is threaded with symmetrically distributed fifth positioning bolts (42) that extend into the interior of the telescopic slide rod (13).

5. The mobile telescoping support tool for compressor housing installation of claim 4, wherein: A wireless transceiver (36) is fixedly connected to the side of the mounting frame (3) away from the solar panel (31). A main control board is fixedly connected inside the wireless transceiver (36), and a control chip is fixedly connected to the outside of the main control board. The control chip is used to control the solar panel (31), the lighting lamp (34), the wireless transceiver (36), and the battery storage compartment (46), all of which are electrically connected to the control chip.

6. The mobile telescopic support tool for compressor housing mounting according to claim 1, wherein: The two side reinforcement plates (21) are provided with mounting holes (22) on the side of the support column (1) respectively. The positioning rods that can be inserted into the support column (1) can be installed in the mounting holes (22).

7. The mobile telescopic support tool for compressor housing mounting according to claim 6, wherein: The two auxiliary support seats (26) are threaded with second positioning bolts (27), the bottom of the two side reinforcement plates (21) are fixedly connected with support base plates (2), the bottom of the support column (1) is fixedly connected with the top of the support base plate (2), and the support base plate (2) is threaded with equally spaced third positioning bolts (28).