Anti-falling three-phase asynchronous motor
By designing a protection mechanism and a smooth mechanism on a three-phase asynchronous motor, the mechanical damage and safety threats caused by motor drop are solved, and the stable operation and applicability of the motor are achieved.
Patent Information
- Application Number
- CN202422485745.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-14
- Publication Date
- 2025-08-08
- Estimated Expiration
- 2034-10-14
AI Technical Summary
The existing three-phase asynchronous motors lack anti-fall measures, which leads to the motor being easily dropped when vibration, collision or improper operation, causing mechanical damage, electrical failure and safety threats. The existing anti-fall measures cannot adapt to different types of motors.
A three-phase asynchronous motor with a protection mechanism and a smooth mechanism is designed to reduce impact damage during drop through a combination of fixing frame, protective pad and rubber, and adjust the center of gravity of the motor through adjustment knobs and support columns to reduce the risk of falling.
Effectively reduce mechanical damage when the motor falls, extend service life, prevent circuit short circuits, ensure stable operation of production processes, reduce safety threats, and adapt to the installation needs of motors of different specifications.
Smart Images

Figure CN223206948U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field related to electrical engineering, in particular to a drop-proof three-phase asynchronous motor. Background Art
[0002] In the industrial field, three-phase asynchronous motors are indispensable for driving machinery in large factories and various equipment on automated production lines. With the continuous improvement of industrial automation, the requirements for the stability and reliability of motors are also increasing. However, traditional three-phase asynchronous motors face many challenges in actual use. In some special industrial environments, such as mines and construction sites, the working environment of motors is complex and harsh. Equipment often needs to operate at high altitudes or on unstable platforms. Due to vibration, collision, or improper operation, there is a risk of motors falling. Once a fall occurs, the motor will not only suffer serious mechanical damage, shortening its normal service life, but also may cause electrical faults such as circuit short circuits, thereby affecting the normal operation of the entire production process and causing huge economic losses to the enterprise. In daily life, three-phase asynchronous motors are also widely used, such as in some large household and commercial electrical equipment. Similarly, during installation, use, or maintenance, if the motor is improperly placed or encounters an unexpected situation, it may also fall. Moreover, due to the frequent human activities in daily environments, a motor fall may also pose a safety threat to nearby personnel. Therefore, there is a particular need for a three-phase asynchronous motor with anti-fall function.
[0003] However, existing three-phase asynchronous motors are often not equipped with corresponding anti-fall measures, which may lead to the risk of the motor falling due to vibration, collision or improper operation. Once a fall occurs, the motor will not only suffer serious mechanical damage, affecting its normal service life, but may also cause electrical faults such as circuit short circuit, thereby affecting the normal operation of the entire production process, causing huge economic losses to the enterprise. Moreover, due to the frequent activities of people in daily environment, the fall of the motor may also pose a safety threat to the surrounding personnel. Even if there are corresponding anti-fall measures, due to design reasons, the anti-fall measures can only be used on specified three-phase asynchronous motors, and cannot be used for different types of three-phase asynchronous motors, reflecting the limitations of its anti-fall measures. Utility Model Content
[0004] The purpose of the present invention is to provide a three-phase asynchronous motor with anti-drop function to solve the problem that the existing three-phase asynchronous motors proposed in the above background technology are often not provided with corresponding anti-drop measures, which will lead to the risk of the motor falling due to vibration, collision or improper operation. Once a fall occurs, the motor will not only suffer serious mechanical damage, affecting its normal service life, but may also cause electrical faults such as circuit short circuit, thereby affecting the normal operation of the entire production process and causing huge economic losses to the enterprise. Moreover, due to the frequent activities of people in the daily environment, the fall of the motor may also pose a safety threat to the surrounding people. Even if there are corresponding anti-drop measures, due to design reasons, the anti-drop measures can only be used on specified three-phase asynchronous motors, and cannot be used for different types of three-phase asynchronous motors, reflecting the limitations of its anti-drop measures.
[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a three-phase asynchronous motor with an anti-fall function, comprising a motor body, a power supply interface fixedly connected to the upper surface of the motor body, a motor front end fixedly connected to one side surface of the motor body, a motor tail end fixedly connected to one side surface of the motor body, a protective mechanism provided on one side surface of the motor tail end, and a stabilizing mechanism provided on one side surface of the protective mechanism;
[0006] The protection mechanism includes a tail end protection pad, a tail end fixing frame, a first fixed threaded column, a curved surface protection rubber, a front end protection pad, a front end fixing frame, a second threaded column, a straight surface protection rubber and a connecting column. One side surface of the tail end of the motor is fixedly connected to the tail end protection pad, one side surface of the tail end protection pad is fixedly connected to the tail end fixing frame, one side surface of the tail end fixing frame is slidably connected to the first fixed threaded column, one side surface of the tail end protection pad is fixedly connected to the curved surface protection rubber, one side surface of the curved surface protection rubber is fixedly connected to the front end protection pad, one side surface of the front end protection pad is fixedly connected to the front end fixing frame, one side surface of the front end fixing frame is slidably connected to the second threaded column, one side surface of the curved surface protection rubber is fixedly connected to the straight surface protection rubber, and the lower surface of the front end fixing frame is fixedly connected to the connecting column.
[0007] Preferably, the outer ring size of the tail end protection pad matches the inner ring size of the tail end fixing frame, and the protection pad is fixedly connected to the tail end fixing frame accordingly, and two groups of the first fixing threaded columns are symmetrically arranged around the central axis of the tail end fixing frame.
[0008] Preferably, the curved surface protective rubber can roughly fit the upper surface of the motor, and a plurality of heat dissipation holes are provided on one side surface of the straight surface protective rubber.
[0009] Preferably, the front protection pad and the front fixing frame are arranged in the same manner as the rear protection pad and the rear fixing frame, and the connecting columns are symmetrically arranged in multiple groups around the perpendicular midline of the front fixing frame and the rear fixing frame.
[0010] Preferably, the stabilizing mechanism includes a support column, a length-adjusting threaded column, an adjusting knob, a fastening clamp, a telescopic rod and a supporting foot. The lower surface of the connecting column is fixedly connected to the support column, one side surface of the support column is rotatably connected to the length-adjusting threaded column, one side surface of the length-adjusting threaded column is fixedly connected to the adjusting knob, one side surface of the support column is fixedly connected to the fastening clamp, one side surface of the fastening clamp is slidably connected to the telescopic rod, and one side surface of the telescopic rod is fixedly connected to the supporting foot.
[0011] Preferably, two groups of the support columns are provided below the motor body, and three groups of the length-adjusting threaded columns are provided symmetrically about the central axis of the support columns.
[0012] Preferably, the adjusting knob is fixedly connected to the length-adjusting threaded column and the adjusting knob is provided with multiple sets of anti-slip grooves, and the fastening clamp is provided at both ends of each support column.
[0013] Preferably, the inner wall size of the fastening hoop is slightly smaller than the outer wall size of the telescopic rod, and the telescopic rod is fastened and engaged. The supporting legs form a telescopic structure through the telescopic rod and the supporting column, and there are four groups of supporting legs and telescopic rods distributed at both ends of the two supporting columns.
[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: through the setting of the protection mechanism, when the motor needs to be protected, the front-end fixing frame and the tail-end fixing frame are respectively fixed to the front end and the tail end of the motor corresponding to the motor, and then the first fixing threaded column and the second threaded column are used to firmly fix them. Due to the presence of the front-end protection pad and the tail-end protection pad, the fixing frame is used to obtain a protective effect when the motor is fixedly connected, preventing the motor from being damaged. Then the curved surface protection rubber naturally fits with the upper surface of the motor, and the straight surface protection rubber fits with the side of the motor, so that when the motor falls, the damage caused by the impact is greatly reduced, the service life of the motor is extended, the normal operation of the entire production process is guaranteed, and the side of the straight surface protection rubber dissipates heat. The setting of the hole is conducive to the heat discharge of the motor and prevents the motor failure caused by excessive internal temperature. Through the setting of the stabilizing mechanism, when it is necessary to prevent the motor from falling, turn the adjustment knob, and the adjustment knob drives the support column to move back and forth by driving the length adjustment threaded column to control the front and back distance of the two support columns. Knowing the position corresponding to the front end fixing frame and the rear end fixing frame described above, the support column is then fixed to the connecting column, and then the telescopic rod is pulled out to expand the chassis of the motor body and lower the center of gravity of the entire device, which can greatly reduce the risk of the motor body falling and prevent the fall from posing a safety threat to surrounding personnel. In addition, due to the length adjustment setting, the two mechanisms can adapt to motors of different specifications and sizes, reflecting the applicability and flexibility of the mechanism. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 This is a side view of the structure of the utility model;
[0016] Figure 2 This is a schematic diagram of the cooperation between the motor and the protection mechanism in this utility model;
[0017] Figure 3 This is a schematic diagram of the cooperation between the protection mechanism and the stabilization mechanism of this utility model;
[0018] Figure 4 This is a schematic diagram of the structure of the practical stable mechanism;
[0019] Figure 5 This is a schematic diagram of the cooperation between the front fixing frame and the front protection pad in this utility model;
[0020] Figure 6 This is a schematic diagram of the structure of the front fixing frame, curved surface protection rubber and straight surface protection rubber cooperating with each other in this utility model;
[0021] In the figure: 1. Motor body; 2. Power interface; 3. Motor front end; 4. Motor tail end; 5. Protection mechanism; 501. Tail end protection pad; 502. Tail end fixing frame; 503. First fixed threaded column; 504. Curved surface protection rubber; 505. Front end protection pad; 506. Front end fixing frame; 507. Second threaded column; 508. Straight surface protection rubber; 509. Connecting column; 6. Stabilizing mechanism; 601. Support column; 602. Length adjustment threaded column; 603. Adjustment knob; 604. Fastening clamp; 605. Telescopic rod; 606. Support foot. DETAILED DESCRIPTION
[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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 making creative efforts are within the scope of protection of the present invention.
[0023] See also Figure 1-6 The utility model provides a technical solution: a fall-proof three-phase asynchronous motor, comprising a motor body 1, a power interface 2 fixedly connected to the upper surface of the motor body 1, a motor front end 3 fixedly connected to the side surface of the motor body 1, a motor tail end 4 fixedly connected to the side surface of the motor body 1, a protective mechanism 5 provided on one side surface of the motor tail end 4, and a stabilizing mechanism 6 provided on one side surface of the protective mechanism 5;
[0024] The protection mechanism 5 includes a tail end protection pad 501, a tail end fixing frame 502, a first fixed threaded column 503, a curved surface protection rubber 504, a front end protection pad 505, a front end fixing frame 506, a second threaded column 507, a straight surface protection rubber 508 and a connecting column 509. One side surface of the motor tail end 4 is fixedly connected to the tail end protection pad 501, one side surface of the tail end protection pad 501 is fixedly connected to the tail end fixing frame 502, one side surface of the tail end fixing frame 502 is slidably connected to the first fixed threaded column 503, and the tail end protection pad 501 is fixedly connected to the tail end fixing frame 502. One side surface of the protective pad 501 is fixedly connected to a curved surface protective rubber 504, one side surface of the curved surface protective rubber 504 is fixedly connected to a front end protective pad 505, one side surface of the front end protective pad 505 is fixedly connected to a front end fixing frame 506, one side surface of the front end fixing frame 506 is slidably connected to a second threaded column 507, one side surface of the curved surface protective rubber 504 is fixedly connected to a straight surface protective rubber 508, and the lower surface of the front end fixing frame 506 is fixedly connected to a connecting column 509. The end fixing frame 502, the first fixing threaded column 503, the curved surface protection rubber 504, the front end protection pad 505, the front end fixing frame 506, the second threaded column 507, the straight surface protection rubber 508 and the connecting column 509 are set. When in use, the front end fixing frame 506 and the tail end fixing frame 502 are respectively fixed to the motor front end 3 and the motor tail end 4 corresponding to the motor, and then the first fixing threaded column 503 and the second threaded column 507 are used to firmly fix them. Due to the presence of the front end protection pad 505 and the tail end protection pad 501, the use of the fixing frame can achieve a protective effect when fixing the motor to prevent the motor from being damaged. Then the curved surface protection rubber 504 naturally fits with the upper surface of the motor, and the straight surface protection rubber 508 fits with the side of the motor, so that when the motor falls, the damage caused by impact is greatly reduced, the service life of the motor is extended, and the normal operation of the entire production process is ensured. The side heat dissipation holes of the straight surface protection rubber 508 are conducive to the heat discharge of the motor, preventing the motor from failing due to excessive internal temperature.
[0025] Furthermore, the outer ring size of the tail end protection pad 501 is consistent with the inner ring size of the tail end fixing frame 502, and the protection pad 501 is fixedly connected to the tail end fixing frame 502 accordingly, and two groups of first fixed threaded columns 503 are symmetrically arranged with the central axis of the tail end fixing frame 502. Through the arrangement of the tail end protection pad 501 and the tail end fixing frame 502, when in use, the size of the outer ring 501 of the tail end protection pad is consistent with the size of the inner ring 502 of the tail end fixing frame, so that the protection pad 501 and the fixing frame can be tightly combined. During the operation of the motor, there will be no relative displacement due to vibration and the like, ensuring that the protection pad 501 is always in the correct protection position, providing continuous and stable protection for the motor.
[0026] Furthermore, the curved protective rubber 504 can roughly fit with the upper surface of the motor, and a plurality of heat dissipation holes are opened on one side surface of the straight protective rubber 508. Through the arrangement of the curved protective rubber 504 and the straight protective rubber 508, during use, when the motor falls, the curved protective rubber 504 can first contact the collision surface. Since it roughly fits with the upper surface of the motor, it can absorb and disperse the impact force through its own elastic deformation, thereby avoiding direct damage to the upper surface of the motor by impact. The multiple heat dissipation holes opened on one side surface of the straight protective rubber 508 form a heat dissipation channel, which can accelerate the exchange of heat inside the motor and the external cold air.
[0027] Furthermore, the front end protection pad 505 and the front end fixing frame 506 are arranged in the same manner as the rear end protection pad 501 and the rear end fixing frame 502, and multiple groups of connecting columns 509 are symmetrically arranged with the midline of the front end fixing frame 506 and the rear end fixing frame 502. Through the arrangement of the connecting columns 509, when in use, multiple groups of connecting columns 509 are symmetrically arranged with the midline of the front end fixing frame 506 and the rear end fixing frame, so that the entire protection mechanism is evenly stressed when connecting the front and rear ends of the motor, which can effectively prevent the motor from twisting or shaking after being fixed, and ensure the firmness and stability of the motor installation.
[0028] Furthermore, the stabilizing mechanism 6 includes a support column 601, a length-adjusting threaded column 602, an adjusting knob 603, a fastening clamp 604, a telescopic rod 605 and a support foot 606. The lower surface of the connecting column 509 is fixedly connected to the support column 601, and one side surface of the supporting column 601 is rotatably connected to the length-adjusting threaded column 602, and one side surface of the length-adjusting threaded column 602 is fixedly connected to the adjusting knob 603. Therefore, the forehead surface of the supporting column 601 is fixedly connected to the fastening clamp 604, and one side surface of the fastening clamp 604 is slidably connected to the telescopic rod 605, and one side surface of the telescopic rod 605 is fixedly connected to the supporting foot 606. The setting of the retractable rod 605 and the support foot 606, when in use, turn the adjustment knob 603, and the adjustment knob 603 drives the support column 601 to move back and forth by driving the length adjustment threaded column 602, so as to control the front and back distance between the two support columns 601, and know the position corresponding to the front end fixing frame 506 and the tail end fixing frame 502 described above, and then connect the support column 601 with the connecting column 509, and then pull out the telescopic rod 605 to expand the base of the motor body and lower the center of gravity of the entire device, which can greatly reduce the risk of the motor body falling and prevent the fall from posing a safety threat to the surrounding people. In addition, due to the length adjustment setting, the two mechanisms can adapt to motors of different specifications and sizes, reflecting the applicability and flexibility of the mechanism.
[0029] Furthermore, two groups of support columns 601 are arranged below the motor body 1, and three groups of length-adjusting threaded columns 602 are symmetrically arranged about the central axis of the support column 601. Through the arrangement of the support columns 601 and the length-adjusting threaded columns 602, when in use, two groups of support columns 601 are arranged below the motor body, which can provide a stable support foundation for the motor. When the motor is placed on a plane, the two groups of support columns 601 can evenly share the weight of the motor, preventing the motor from tilting or shaking due to unstable center of gravity, thereby ensuring the stability of the motor during operation. Moreover, the three groups of length-adjusting threaded columns 602 are symmetrically arranged about the central axis of the support column 601, which can more accurately adjust the support column 601 and its position. By adjusting the threaded columns 602, the front and rear distance of the support column 601 can be flexibly adjusted according to different usage scenarios and motor specifications, so that the motor can adapt to various complex installation environments.
[0030] Furthermore, the adjusting knob 603 is fixedly connected to the length adjusting threaded column 602 and the adjusting knob 603 is provided with multiple groups of anti-slip grooves, and the fastening clamp 604 is provided at both ends of each support column 601. Through the setting of the length adjusting threaded column 602 and the adjusting knob 603, when in use, the adjusting knob 603 is fixedly connected to the length adjusting threaded column 602, so that the operator can easily adjust the distance of the support column 601 by rotating the adjusting knob 603. This direct operation method is simple and intuitive, does not require the use of additional tools, and improves the efficiency of adjustment. Multiple groups of anti-slip grooves are provided on the adjusting knob 603, which increases the friction of the knob, making it easier and more stable for the operator to rotate the knob. Even if there is sweat or grease on the hands, it can effectively prevent slipping, thereby improving the safety and reliability of operation.
[0031] Furthermore, the inner wall size of the fastening clamp 604 is slightly smaller than the outer wall size of the telescopic rod 605, and the telescopic rod 605 is fastened and engaged. The supporting feet 606 form a telescopic structure with the support column 601 through the telescopic rod 605, and there are four groups of supporting feet 606 and telescopic rod 605 distributed at both ends of the two support columns 601. Through the setting of the fastening clamp 604, when in use, the inner wall size of the fastening clamp 604 is slightly smaller than the outer wall size of the telescopic rod 605, which can fasten and engage the telescopic rod 605, ensuring that the telescopic rod 605 will not slide or loosen easily during use. This makes the support structure more stable and reliable, able to withstand the weight of the motor and external force impact, and effectively prevent the motor from falling.
[0032] Working principle: through the setting of the protection mechanism 5, when it is necessary to take protective measures for the motor, the front end fixing frame 506 and the tail end fixing frame 502 are respectively fixed to the motor front end 3 and the motor tail end 4 corresponding to the motor, and then the first fixing threaded column 503 and the second threaded column 507 are used to firmly fix it. Due to the presence of the front end protection pad 505 and the tail end protection pad 501, the use of the fixing frame can achieve a protective effect when fixing the motor to prevent the motor from being damaged. Then the curved surface protection rubber 504 naturally fits with the upper surface of the motor, and the straight surface protection rubber 508 fits with the side of the motor, so that when the motor falls, the damage caused by the impact is greatly reduced, the service life of the motor is extended, and the normal operation of the entire production process is ensured. The setting of the side heat dissipation holes of the straight surface protection rubber 508 is beneficial to the motor. The heat discharge of the machine prevents the motor failure caused by excessive internal temperature. Through the setting of the stabilizing mechanism 6, when it is necessary to prevent the motor from falling, turn the adjusting knob 603, and the adjusting knob 603 drives the support column 601 to move back and forth by driving the length adjustment threaded column 602, so as to control the front and back distance of the two support columns 601, and know the position corresponding to the front end fixing frame 506 and the rear end fixing frame 502 described above, and then connect the support column 601 with the connecting column 509, and then pull out the telescopic rod 605 to expand the base of the motor body and lower the center of gravity of the whole device, which can greatly reduce the risk of the motor body falling and prevent the fall from posing a safety threat to the surrounding personnel. In addition, due to the length adjustment setting, the two mechanisms can adapt to motors of different specifications and sizes, reflecting the applicability and flexibility of the mechanism.
[0033] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A three-phase asynchronous motor with an anti-drop function, comprising a motor body (1), characterized in that: The upper surface of the motor body (1) is fixedly connected to a power interface (2), the side surface of the motor body (1) is fixedly connected to a motor front end (3), the side surface of the motor body (1) is fixedly connected to a motor tail end (4), a side surface of the motor tail end (4) is provided with a protection mechanism (5), and a side surface of the protection mechanism (5) is provided with a stabilizing mechanism (6); The protection mechanism (5) comprises a tail end protection pad (501), a tail end fixing frame (502), a first fixed threaded column (503), a curved surface protection rubber (504), a front end protection pad (505), a front end fixing frame (506), a second threaded column (507), a straight surface protection rubber (508) and a connecting column (509); one side surface of the motor tail end (4) is fixedly connected to the tail end protection pad (501); one side surface of the tail end protection pad (501) is fixedly connected to the tail end fixing frame (502); one side surface of the tail end fixing frame (502) is slidably connected to the first fixed threaded column ( 503), one side surface of the tail end protection pad (501) is fixedly connected to a curved surface protection rubber (504), one side surface of the curved surface protection rubber (504) is fixedly connected to a front end protection pad (505), one side surface of the front end protection pad (505) is fixedly connected to a front end fixing frame (506), one side surface of the front end fixing frame (506) is slidably connected to a second threaded column (507), one side surface of the curved surface protection rubber (504) is fixedly connected to a straight surface protection rubber (508), and the lower surface of the front end fixing frame (506) is fixedly connected to a connecting column (509).
2. The anti-drop three-phase asynchronous motor according to claim 1, characterized in that: The outer ring size of the tail end protection pad (501) matches the inner ring size of the tail end fixing frame (502), and the protection pad (501) and the tail end fixing frame (502) are fixedly connected in correspondence, and two groups of the first fixing threaded columns (503) are symmetrically arranged around the central axis of the tail end fixing frame (502).
3. The anti-drop three-phase asynchronous motor according to claim 1, characterized in that: The curved surface protective rubber (504) can roughly fit the upper surface of the motor, and a plurality of heat dissipation holes are provided on one side surface of the straight surface protective rubber (508).
4. The anti-drop three-phase asynchronous motor according to claim 1, characterized in that: The front end protection pad (505) and the front end fixing frame (506) are arranged in the same manner as the rear end protection pad (501) and the rear end fixing frame (502), and the connecting columns (509) are symmetrically arranged in multiple groups along the perpendicular midline of the front end fixing frame (506) and the rear end fixing frame (502).
5. The anti-drop three-phase asynchronous motor according to claim 1, characterized in that: The stabilizing mechanism (6) comprises a support column (601), a length adjustment threaded column (602), an adjustment knob (603), a fastening hoop (604), a telescopic rod (605) and a support leg (606); the lower surface of the connecting column (509) is fixedly connected to the support column (601); a side surface of the support column (601) is rotatably connected to the length adjustment threaded column (602); a side surface of the length adjustment threaded column (602) is fixedly connected to the adjustment knob (603); a side surface of the support column (601) is fixedly connected to the fastening hoop (604); a side surface of the fastening hoop (604) is slidably connected to the telescopic rod (605); and a side surface of the telescopic rod (605) is fixedly connected to the support leg (606).
6. The anti-drop three-phase asynchronous motor according to claim 5, characterized in that: Two groups of the support columns (601) are provided below the motor body (1), and three groups of the length-adjusting threaded columns (602) are symmetrically provided about the central axis of the support columns (601).
7. The anti-drop three-phase asynchronous motor according to claim 5, characterized in that: The adjusting knob (603) is fixedly connected to the length-adjusting threaded column (602) and the adjusting knob (603) is provided with a plurality of anti-slip grooves. The fastening hoop (604) is provided at both ends of each supporting column (601).
8. The anti-drop three-phase asynchronous motor according to claim 5, characterized in that: The inner wall size of the fastening hoop (604) is slightly smaller than the outer wall size of the telescopic rod (605), and the telescopic rod (605) is fastened and clamped. The supporting legs (606) form a telescopic structure with the supporting column (601) through the telescopic rod (605), and there are four groups of supporting legs (606) and the telescopic rod (605) distributed at both ends of the two supporting columns (601).