Overweight vibration composite dynamics simulation device

Abstract

The invention provides an overweight vibration composite dynamics simulation device. The overweight vibration composite dynamics simulation device comprises a vehicle body, a sliding mechanism, a supporting beam, a centrifugal mechanism, an up-down vibration mechanism and a radial vibration mechanism, the top of the vehicle body is connected with the centrifugal mechanism, a groove is formed in the bottom of the vehicle body, one end of the supporting beam is arranged in the groove, the other end of the supporting beam is fixed to the ground, the supporting beam is movably connected with the groove through the sliding mechanism, and the radial vibration mechanism is installed in the end, away from the ground, of the supporting beam. The up-down vibration mechanism is mounted between the groove and one end, provided with the radial vibration mechanism, of the supporting beam; the characteristic of small frictional resistance of the magnetic suspension technology is adopted, the vehicle body is driven by the centrifugal mechanism to generate different rotating speeds, so that different training requirements are met, vertical vibration and radial vibration of the vehicle body are finally achieved by controlling the current of the suspension electromagnet, and the vehicle is more in line with complex vibration conditions in actual conditions.

Description

Technical Field

[0001] The present application relates to the field of aerospace dynamics simulation, and in particular to a super-heavy vibration composite dynamics simulation device. Background Art

[0002] In the field of aerospace, astronauts and aerospace products will inevitably be in a complex working environment where vibration and overweight are superimposed on each other. For example, in order to overcome the gravity of the earth, the spacecraft uses the power of the rocket to gradually accelerate to the orbital speed during the launch process. During the acceleration process, the inertial force generated by the acceleration causes the astronauts in the manned spacecraft to be in an overweight state. The overweight overload during the launch of the spacecraft can reach 5 to 8g, while the space shuttle can be controlled at the level of 3g. When the spacecraft returns to the ground after completing the orbital flight, the deceleration of the deorbit braking rocket power and the aerodynamic deceleration of the re-entry into the atmosphere will also bring a large overload to the astronauts in the spacecraft. Its duration and peak value are related to the re-entry angle during the re-entry process of the spacecraft and the power state of the spacecraft itself. At present, the maximum overload value of the spacecraft during the normal return process is usually between 4 and 5g, while the overload value of the space shuttle will not exceed 3g. Under abnormal circumstances, the emergency return and overweight overload values ​​will be far beyond the normal range. During the emergency escape of the launch phase of the spacecraft, astronauts may encounter overweight overloads of 8 to 15g or more. Studies have shown that when astronauts experience overloads of tens of seconds to several minutes, the longitudinal overload (also known as head-pelvis overload) and lateral overload (also known as chest-back overload) have the greatest impact on the human body. In addition, astronauts will also be disturbed by the vibration of the spacecraft. At the same time, aerospace products also need to be able to adapt to the environment of overweight vibration during design and manufacturing. Therefore, it is very necessary to establish a dynamic device suitable for simulating the complex situation of overweight vibration on a plane.

[0003] Application Contents

[0004] In order to overcome the above-mentioned deficiencies of the prior art, the present application proposes an overweight vibration composite dynamics simulation device, comprising: a vehicle body 5, a sliding mechanism, a support beam 1, a centrifugal mechanism, an up-and-down vibration mechanism and a radial vibration mechanism;

[0005] The top of the vehicle body 5 is connected to the centrifugal mechanism, the bottom of the vehicle body 5 is provided with a groove, one end of the support beam 1 is arranged in the groove, the other end of the support beam 1 is fixed on the ground, the support beam 1 is movably connected to the groove through a sliding mechanism, the radial vibration mechanism is installed inside the end of the support beam 1 away from the ground, and the up-and-down vibration mechanism is installed between the groove and the end of the support beam 1 on which the radial vibration mechanism is installed;

[0006] The up-and-down vibration mechanism is used to control the suspension of the vehicle body 5 and realize the vibration in the vertical direction;

[0007] The radial vibration mechanism is used to control the vehicle body 5 to achieve horizontal vibration.

[0008] Preferably, the up-and-down vibration mechanism comprises: a suspension electromagnet 2, a controller 15 and a gap sensor 16; the groove is a T-shaped groove with an open end facing the ground, one side of the suspension electromagnet 2 is connected to a side of the T-shaped groove close to the ground, the other side of the suspension electromagnet 2 is connected to the controller 15, the side of the controller 15 away from the suspension electromagnet 2 is connected to the gap sensor 16, and there is a gap between the side of the gap sensor 16 away from the controller 15 and the support beam 1;

[0009] The gap sensor 16 is used to detect the distance between the suspension electromagnet 2 and the support beam 1, and transmit the distance signal to the controller 15;

[0010] The controller 15 is used to control the magnitude of the current in the suspension electromagnet 2 according to the distance signal transmitted by the gap sensor 16. When the gap sensor 16 detects that the distance between the suspension electromagnet 2 and the supporting beam 1 is greater than a fixed value d, the controller 15 increases the current in the suspension electromagnet 2 to generate a stronger attraction, so that the vehicle body 5 moves upward; when the gap sensor 16 detects that the distance between the suspension electromagnet 2 and the supporting beam 1 is less than or equal to a fixed value d, the controller 15 reduces the current in the suspension electromagnet 2 to generate a weaker attraction, so that the vehicle body 5 moves downward.

[0011] Preferably, two up-and-down vibration mechanisms are provided, and the two up-and-down vibration mechanisms are symmetrically arranged on one side of the inner side of the groove of the vehicle body 5 close to the ground.

[0012] Preferably, the support beam 1 is a T-shaped structure, one end of the T-shaped structure parallel to the ground is movably connected to the groove through a sliding mechanism, and the other end of the T-shaped structure is fixed on the ground.

[0013] Preferably, the radial vibration mechanism includes: a vibrating electromagnet 3 and a spring device 4, one end of the spring device 4 is connected to the inside of one end of the T-shaped structure parallel to the ground, and the other end of the spring device 4 is connected to the vibrating electromagnet 3.

[0014] Preferably, two radial vibration mechanisms are provided, and the two radial vibration mechanisms are symmetrically arranged at two ends of one end of the T-shaped structure parallel to the ground.

[0015] Preferably, the sliding mechanism comprises: a sliding support shaft 6 and a supporting slide 7 which are arranged opposite to each other, the supporting slide 7 is connected to the vehicle body 5, and the sliding support shaft 6 is connected to the supporting beam 1;

[0016] When the entire device is stationary, the sliding support shaft 6 is in contact with the supporting slide 7 .

[0017] Preferably, the centrifugal mechanism comprises: a connecting rod 8, a working rotating arm 9, a working spindle 10 and an electric drive assembly connected in sequence;

[0018] One end of the connecting rod 8 away from the working rotating arm 9 is connected to the top of the vehicle body 5, the working rotating arm 9 is arranged parallel to the ground, the connecting rod 8 and the working spindle 10 are respectively vertically connected to the two ends of the working rotating arm 9, and the electric drive assembly is fixedly installed on the ground.

[0019] Preferably, the electric drive assembly includes: a gearbox 11, a coupling 12, a motor 13 and a motor base 14 connected in sequence; the gearbox 11 is connected to the working spindle 10 on the side away from the motor 13, and the gearbox 11 and the motor base 14 are respectively fixedly mounted on the ground.

[0020] Preferably, the connecting rod 8 is a telescopic connecting rod, and both ends of the telescopic connecting rod are circular through-hole structures.

[0021] Compared with the closest prior art, the present application has the following beneficial effects:

[0022] An overweight vibration composite dynamics simulation device comprises: a vehicle body 5, a sliding mechanism, a support beam 1, a centrifugal mechanism, an up-and-down vibration mechanism and a radial vibration mechanism; the top of the vehicle body 5 is connected to the centrifugal mechanism, the bottom of the vehicle body 5 is provided with a groove, one end of the support beam 1 is arranged in the groove, the other end of the support beam 1 is fixed on the ground, the support beam 1 is movably connected with the groove through the sliding mechanism, the radial vibration mechanism is installed inside the end of the support beam 1 away from the ground, the up-and-down vibration mechanism is installed between the groove and the end of the support beam 1 where the radial vibration mechanism is installed; the up-and-down vibration mechanism is used to control the vehicle body 5 is suspended and realizes vertical vibration; the radial vibration mechanism is used to control the car body 5 to realize horizontal vibration; the device adopts magnetic suspension technology, which has less resistance during rotation and is easier to realize centrifugal forces of different sizes, thereby meeting the training requirements under different conditions; the device changes the distance between the support beam 1 and the suspension electromagnet 2 by controlling the current to realize up and down vibration; vibration electromagnets 3 are installed at both ends of the support beam 1, and radial vibration is realized through close cooperation with each other, and the vibration forms are rich; because the car body 5 is connected to the working rotating arm 9 through the connecting rod 8, the safety of astronaut training and aerospace product experiments is improved to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of a super-heavy vibration composite dynamics simulation device provided in this application;

[0024] Figure 2 A partial schematic diagram of a suspension electromagnet of a super-heavy vibration composite dynamics simulation device provided in this application;

[0025] Figure 3 A schematic diagram of the state of the right electromagnet of a super-heavy vibration composite dynamics simulation device provided by the present application after operation;

[0026] Figure 4 A schematic diagram of the connecting rod structure of a super-heavy vibration composite dynamics simulation device provided in this application;

[0027] Among them, 1-support beam, 2-suspension electromagnet, 3-vibration electromagnet, 4-spring device, 5-car body, 6-sliding support shaft, 7-support slide, 8-connecting rod, 9-working swing arm, 10-working main shaft, 11-gearbox, 12-coupling, 13-motor, 14-motor base, 15-controller, 16-gap sensor. DETAILED DESCRIPTION

[0028] The specific implementation methods of the present application are further described in detail below in conjunction with the accompanying drawings.

[0029] Embodiment 1:

[0030] The present application provides a super-heavy vibration composite dynamics simulation device, such as Figure 1 As shown, it includes: a vehicle body 5, a sliding mechanism, a support beam 1, a centrifugal mechanism, an up and down vibration mechanism and a radial vibration mechanism;

[0031] The top of the vehicle body 5 is connected to the centrifugal mechanism, the bottom of the vehicle body 5 is provided with a groove, one end of the support beam 1 is arranged in the groove, the other end of the support beam 1 is fixed on the ground, the support beam 1 is movably connected to the groove through a sliding mechanism, the radial vibration mechanism is installed inside the end of the support beam 1 away from the ground, and the up-and-down vibration mechanism is installed between the groove and the end of the support beam 1 on which the radial vibration mechanism is installed;

[0032] The up-and-down vibration mechanism is used to control the suspension of the vehicle body 5 and realize the vibration in the vertical direction;

[0033] The radial vibration mechanism is used to control the vehicle body 5 to achieve horizontal vibration.

[0034] In order to enable aerospace personnel to withstand the overweight vibration during the launch and re-entry of the spacecraft into the atmosphere, and to ensure that aerospace products maintain stable operation under overweight vibration conditions. This application proposes an overweight vibration composite dynamics simulation device. The device drives the rotation of the working spindle 10 through a motor 13, and can generate a sufficiently large centrifugal force driven by the working rotating arm 9, thereby meeting the overweight training needs. The presence of the suspension electromagnet 2 can realize the up and down vibration of the vehicle body 5. Vibrating electromagnets 3 are installed at both ends of the support beam 1, and the vibrating electromagnet 3 is connected to a spring device 4. Through the close cooperation of the left and right two vibrating electromagnets 3, the radial vibration of the vehicle body 5 is realized. During the vibration process, the vehicle body 5 can adapt to the left and right shaking of the car through the special structure of the connecting rod turntable. In an emergency, the working rotating arm 9 can forcibly control the speed and brake smoothly without causing personal injury too quickly.

[0035] The adopted technical solution is to make full use of the small friction resistance of magnetic levitation technology. Driven by the working rotating arm 9, the vehicle body 5 generates different rotation speeds to meet different training needs.

[0036] like Figure 2 As shown, the up-and-down vibration mechanism includes: a suspension electromagnet 2, a controller 15 and a gap sensor 16; the groove is a T-shaped groove with an open end facing the ground, one side of the suspension electromagnet 2 is connected to the side of the T-shaped groove close to the ground, the other side of the suspension electromagnet 2 is connected to the controller 15, the side of the controller 15 away from the suspension electromagnet 2 is connected to the gap sensor 16, and there is a gap between the side of the gap sensor 16 away from the controller 15 and the support beam 1;

[0037] The gap sensor 16 is used to detect the distance between the suspension electromagnet 2 and the support beam 1, and transmit the distance signal to the controller 15;

[0038] The controller 15 is used to control the magnitude of the current in the suspension electromagnet 2 according to the distance signal transmitted by the gap sensor 16. When the gap sensor 16 detects that the distance between the suspension electromagnet 2 and the supporting beam 1 is greater than a fixed value d, the controller 15 increases the current in the suspension electromagnet 2 to generate a stronger attraction, so that the vehicle body 5 moves upward; when the gap sensor 16 detects that the distance between the suspension electromagnet 2 and the supporting beam 1 is less than or equal to a fixed value d, the controller 15 reduces the current in the suspension electromagnet 2 to generate a weaker attraction, so that the vehicle body 5 moves downward.

[0039] The device controls the current of the suspension electromagnet 2 to generate different sizes of attraction between the base of the car body 5 and the bottom of the support beam 1, and finally realizes the up and down vibration of the car body 5. In addition to the up and down vibration, the device can also realize radial vibration, which is more in line with the complex situation of vibration in actual conditions. Vibrating electromagnets 3 are installed at both ends of the support beam 1, and the vibrating electromagnets 3 are connected to spring devices 4. The spring devices 4 can be radially extended and retracted, and the radial vibration of the car body 5 is realized by starting and stopping the vibrating electromagnets 3 at both ends. During the vibration process of the car body 5, there is no doubt that there will be different degrees of deviation. At this time, the connecting rod structure installed in the middle of the car body 5 has only one degree of freedom, which can ensure that it can adapt to the up and down and left and right shaking of the car body 5. When aerospace personnel feel unwell during training or aerospace products are damaged during operation, the working arm 9 can forcibly control the rotation speed so that the car body 5 stops at a steady speed, thereby ensuring the safety of personnel.

[0040] Preferably, two up-and-down vibration mechanisms are provided, and the two up-and-down vibration mechanisms are symmetrically arranged on one side of the inner side of the groove of the vehicle body 5 close to the ground.

[0041] When the entire device is stationary, the sliding support shaft 6 is in contact with the supporting sled 7. When the entire device is running, the coil on the suspension electromagnet 2 is energized, thereby generating a magnetic attraction. The support beam 1 maintains a certain distance from the suspension electromagnet 2, about 10 to 15 mm. At the same time, the motor 13 above the motor base 14 is started, and the gears in the gearbox 11 are driven to rotate through the coupling 12. The gears drive the working spindle 10 to rotate, and finally drive the working rotating arm 9 to rotate. The working rotating arm 9 is connected to the vehicle body 5 through the connecting rod 8. Since the vehicle body 5 maintains a certain distance from the support beam 1, the friction during the operation of the vehicle body 5 is very small, and the vehicle body 5 can easily reach an overweight state, which can meet the training requirements under different conditions.

[0042] When the rotation speed is stable, the vibration state is turned on, and the gap sensor 16 constantly detects the distance between the suspension electromagnet 2 and the support beam 1, and transmits the signal to the controller 15, which controls the current. When vibrating up and down, when the gap sensor 16 detects that the distance d between the suspension electromagnet 2 and the support beam 1 is greater than a fixed value, the controller 15 increases the current to generate a stronger attraction, and the vehicle body 5 moves upward. When the gap sensor 16 detects that the distance d between the suspension electromagnet 2 and the support beam 1 is less than or equal to a fixed value, the controller 15 reduces the current to generate a weaker attraction, and the vehicle body 5 moves downward. This reciprocating cycle eventually achieves up and down vibration. Figure 4 As shown, the connecting rod 8 can extend and retract up and down when experiencing up and down vibration.

[0043] Preferably, the support beam 1 is a T-shaped structure, one end of the T-shaped structure parallel to the ground is movably connected to the groove through a sliding mechanism, and the other end of the T-shaped structure is fixed on the ground.

[0044] like Figure 3 As shown, the radial vibration mechanism includes: a vibrating electromagnet 3 and a spring device 4, one end of the spring device 4 is connected to the inside of one end of the T-shaped structure parallel to the ground, and the other end of the spring device 4 is connected to the vibrating electromagnet 3.

[0045] When the coil on the right side of the support beam 1 is energized, the vibrating electromagnet 3 on the right side generates an attractive force, and the car body 5 moves to the left. At the same time, the vibrating electromagnet 3 on the left side is stretched outward under the action of the spring device 4, ensuring that a sufficient distance can be generated to generate an attractive force to move the car body 5 to the right. In order to adapt to the movement of the car body 5, the top and bottom of the connecting rod 8 are designed with circular through holes, which can rotate to a certain extent, thereby causing the connecting rod 8 to tilt. After that, after the car body 5 moves a certain distance to the left, the coil on the left side of the support beam 1 is gradually energized, and the coil current on the right side gradually decreases, the vibrating electromagnet 3 on the left side generates an attractive force, and the vibrating electromagnet 3 on the right side gradually decreases in attractive force, and the car body 5 moves to the right. At the same time, the vibrating electromagnet 3 on the left side shrinks inward under the action of the spring device 4, and the spring device 4 on the right side is activated, moving the vibrating electromagnet 3 on the right side to the right, and maintaining a constant distance from the car body 5. The connecting rod 8 will also tilt in this case. This reciprocating cycle eventually achieves the effect of radial vibration.

[0046] Preferably, two radial vibration mechanisms are provided, and the two radial vibration mechanisms are symmetrically arranged at two ends of one end of the T-shaped structure parallel to the ground.

[0047] Vibrating electromagnets 3 with spring devices 4 are installed at both ends of the supporting beam 1. When the left vibrating electromagnet 3 is energized, the car body 5 is attracted by the electromagnetic force and moves to the right. At the same time, for the stable operation of the car body 5, the electromagnet on the right moves to the right under the action of the spring device 4; when the right vibrating electromagnet 3 is energized, the car body 5 is attracted by the electromagnetic force and moves to the left. At the same time, for the stable operation of the car body 5, the electromagnet on the left moves to the left under the action of the spring device 4; this rapid reciprocation achieves radial vibration of the car body 5.

[0048] Preferably, the sliding mechanism comprises: a sliding support shaft 6 and a supporting slide 7 which are arranged opposite to each other, the supporting slide 7 is connected to the vehicle body 5, and the sliding support shaft 6 is connected to the supporting beam 1;

[0049] When the entire device is stationary, the sliding support shaft 6 is in contact with the supporting slide 7 .

[0050] Preferably, the centrifugal mechanism comprises: a connecting rod 8, a working rotating arm 9, a working spindle 10 and an electric drive assembly connected in sequence;

[0051] One end of the connecting rod 8 away from the working rotating arm 9 is connected to the top of the vehicle body 5, the working rotating arm 9 is arranged parallel to the ground, the connecting rod 8 and the working spindle 10 are respectively vertically connected to the two ends of the working rotating arm 9, and the electric drive assembly is fixedly installed on the ground.

[0052] Preferably, the electric drive assembly includes: a gearbox 11, a coupling 12, a motor 13 and a motor base 14 connected in sequence; the gearbox 11 is connected to the working spindle 10 on the side away from the motor 13, and the gearbox 11 and the motor base 14 are respectively fixedly mounted on the ground.

[0053] This device adopts magnetic levitation technology, which has less resistance during rotation and is easier to achieve centrifugal forces of different sizes, thereby meeting training requirements in different situations; the device changes the distance between the support beam 1 and the suspension electromagnet 2 by controlling the current to achieve up and down vibration; vibration electromagnets 3 are installed at both ends of the support beam 1, and radial vibration is achieved through close cooperation with each other, with rich vibration forms. Since the car body 5 is connected to the working rotating arm 9 through the connecting rod 8, the safety of astronaut training and aerospace product experiments is improved to a certain extent.

[0054] like Figure 4 As shown, the connecting rod 8 is a telescopic connecting rod, and both ends of the telescopic connecting rod are circular through-hole structures.

[0055] The connecting rod 8 can be extended and retracted up and down when experiencing up and down vibration.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application rather than to limit its protection scope. Although the present application has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that after reading the present application, those skilled in the art can still make various changes, modifications or equivalent substitutions to the specific implementation methods of the application, but these changes, modifications or equivalent substitutions are all within the protection scope of the claims to be approved.

Claims

1. A super-heavy vibration composite dynamics simulation device, characterized in that: include: A vehicle body (5), a sliding mechanism, a support beam (1), a centrifugal mechanism, an up-and-down vibration mechanism, and a radial vibration mechanism; The top of the vehicle body (5) is connected to the centrifugal mechanism, the bottom of the vehicle body (5) is provided with a groove, one end of the support beam (1) is arranged in the groove, the other end of the support beam (1) is fixed on the ground, the support beam (1) is movably connected to the groove through a sliding mechanism, the radial vibration mechanism is installed inside the end of the support beam (1) away from the ground, and the up and down vibration mechanism is installed between the groove and the end of the support beam (1) on which the radial vibration mechanism is installed; The up-and-down vibration mechanism is used to control the suspension of the vehicle body and realize the vibration in the vertical direction; The radial vibration mechanism is used to control the vehicle body to achieve horizontal vibration.

2. The device according to claim 1, characterized in that The up-and-down vibration mechanism comprises: a suspension electromagnet (2), a controller (15) and a gap sensor (16); the groove is a T-shaped groove with an open end facing the ground; one side of the suspension electromagnet (2) is connected to a side of the T-shaped groove close to the ground; the other side of the suspension electromagnet (2) is connected to the controller (15); a side of the controller (15) away from the suspension electromagnet (2) is connected to the gap sensor (16); and a side of the gap sensor (16) away from the controller (15) is spaced from the support beam (1); The gap sensor (16) is used to detect the distance between the suspension electromagnet (2) and the support beam (1), and transmit the distance signal to the controller (15); The controller (15) is used to control the magnitude of the current in the suspension electromagnet (2) according to the distance signal transmitted by the gap sensor (16); when the gap sensor (16) detects that the distance between the suspension electromagnet (2) and the support beam (1) is greater than a fixed value d, the controller (15) increases the current in the suspension electromagnet (2) to generate a stronger attraction force, so that the vehicle body (5) moves upward; when the gap sensor (16) detects that the distance between the suspension electromagnet (2) and the support beam (1) is less than or equal to a fixed value d, the controller (15) reduces the current in the suspension electromagnet (2) to generate a weaker attraction force, so that the vehicle body (5) moves downward.

3. The device according to claim 1, characterized in that There are two up-and-down vibration mechanisms, which are symmetrically arranged on one side of the inner side of the groove of the vehicle body (5) close to the ground.

4. The device according to claim 1, characterized in that The support beam (1) is a T-shaped structure, one end of the T-shaped structure parallel to the ground is movably connected to the groove via a sliding mechanism, and the other end of the T-shaped structure is fixed on the ground.

5. The device according to claim 4, characterized in that The radial vibration mechanism comprises: a vibrating electromagnet (3) and a spring device (4), one end of the spring device (4) is connected to the inside of an end of the T-shaped structure parallel to the ground, and the other end of the spring device (4) is connected to the vibrating electromagnet (3).

6. The device according to claim 4, characterized in that There are two radial vibration mechanisms, and the two radial vibration mechanisms are symmetrically arranged at two ends of the end of the T-shaped structure parallel to the ground.

7. The device according to claim 1, characterized in that The sliding mechanism comprises: a sliding support shaft (6) and a supporting slide (7) arranged opposite to each other, the supporting slide (7) being connected to the vehicle body (5), and the sliding support shaft (6) being connected to the supporting beam (1); When the entire device is stationary, the sliding support shaft (6) is in contact with the supporting slide (7).

8. The device according to claim 1, characterized in that The centrifugal mechanism comprises: a connecting rod (8), a working rotating arm (9), a working main shaft (10) and an electric drive assembly which are connected in sequence; One end of the connecting rod (8) away from the working rotating arm (9) is connected to the top of the vehicle body (5), the working rotating arm (9) is arranged parallel to the ground, the connecting rod (8) and the working spindle (10) are respectively vertically connected to the two ends of the working rotating arm (9), and the electric drive assembly is fixedly installed on the ground.

9. The device according to claim 8, characterized in that The electric drive assembly comprises: a gearbox (11), a coupling (12), a motor (13) and a motor base (14) connected in sequence; a side of the gearbox (11) away from the motor (13) is connected to a working spindle (10), and the gearbox (11) and the motor base (14) are respectively fixedly mounted on the ground.

10. The device according to claim 8, characterized in that The connecting rod (8) is a telescopic connecting rod, and both ends of the telescopic connecting rod are circular through-hole structures.

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