Electromechanical equipment protection device

Abstract

The invention provides an electromechanical equipment protection device. The electromechanical equipment protection device comprises a transverse rail, a longitudinal rail and a mounting plate 1, wherein the transverse rail and the longitudinal rail are arranged in a supporting frame; the mounting plate 1 is connected between the rails and a bottom plate of the supporting frame through a self-adaptive supporting system; according to the invention, through the suspension connecting arm which adaptively moves along the track and the elastic supporting structure 6 which is connected between the mounting plate and the bottom plate of the supporting frame and is used for lifting the electromechanical equipment on the mounting plate 1, force is correspondingly stored along with vibration in the running process of the equipment and the distribution state of the weight of the equipment, and confronting torque is provided; and the mounting plate 1 is driven to maintain the electromechanical equipment loaded on the mounting plate 1 in a balanced state. The equipment mounting plate is suspended in the protection device in a balanced mode through the sliding ways and the elastic structures, on one hand, vibration of the equipment can be offset in a self-adaptive mode, and the equipment is kept in the placing state closer to the horizontal state. A complex driving system is not needed, and the installation cost of the electromechanical equipment protection device can be effectively reduced.

Description

Technical Field

[0001] The present application relates to the technical field of electromechanical equipment, and in particular to an electromechanical equipment protection device. Background Art

[0002] Electromechanical equipment usually combines machinery, electrical appliances and electrical automation equipment. When it is working, it is usually accompanied by slight vibration. When it is used in scenes such as construction sites, it is easily affected by external vibrations and produces certain vibrations. If it is not treated with vibration reduction, on the one hand, it may shorten the service life of the electromechanical equipment, on the other hand, it will also affect the accuracy of its operation and easily cause noise pollution.

[0003] The existing electromechanical equipment generally achieves shock absorption by simply adding a gasket under the tripod. Although this method is low-cost and easy to install, it has poor stability and poor shock absorption effect. In addition, the existing shock absorption equipment cannot automatically perform horizontal calibration, and it cannot accurately maintain the electromechanical equipment in a horizontal placement state, so a certain offset angle will be introduced during the processing process. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present application provides a mechanical and electrical equipment protection device, which utilizes a slideway and an elastic structure to balance and suspend the equipment mounting plate in the protection device to offset the vibration of the equipment and keep the equipment in a more horizontal placement state. The present application specifically adopts the following technical solutions.

[0005] Firstly, to achieve the above-mentioned purpose, a protective device for electromechanical equipment is proposed, which includes: a support frame, a transverse track is arranged on the top of the support frame, and longitudinal tracks are also arranged at the four corners of the support frame respectively; a mounting plate, which is horizontally arranged in the support frame; an adaptive support system, which is connected between the mounting plate and the support frame, and includes a suspension connecting arm connecting the transverse track and the longitudinal track, and an elastic support structure connected between the mounting plate and the bottom plate of the support frame for supporting the electromechanical equipment on the mounting plate; a roller is installed on the suspension connecting arm, and the roller rolls along the transverse track and / or the longitudinal track from the equilibrium position in the initial state in response to the vibration of the electromechanical equipment and the distribution of the equipment's own weight. During the rolling process, the roller accumulates force accordingly with the rolling of the wheel body to provide a counteracting torque, thereby driving the mounting plate to maintain a balanced state.

[0006] Optionally, an electromechanical equipment protection device as described in any of the above, wherein the suspension connecting arm includes: a sliding rod, one end of which is connected to a transverse track, and the other end is connected to a longitudinal track, and the middle of the sliding rod is hollowed out to form a guide rail structure; a support column, the top of which is slidably connected to the guide rail structure formed by the hollowing out of the middle of the sliding rod, and the bottom of the support column is rotatably connected to the elastic support structure; the support column is rotatably connected to the outside of the mounting plate, and the support for the mounting plate is dynamically adjusted by the movement and deflection of the sliding rod and the elastic support structure.

[0007] Optionally, an electromechanical equipment protection device as described above, wherein the suspension connecting arm is symmetrically arranged on each side of the mounting plate, and a slide groove is also provided on the side of the mounting plate, a slider is slidably provided on the slide groove, and the lower part of the support column is rotatably connected to the sliders on both sides of the mounting plate.

[0008] Optionally, an electromechanical equipment protection device as described in any of the above, wherein a third slider is further arranged between the support columns on both sides of the mounting plate; the elastic support structure comprises: 4 connecting rods, each end of which is connected to form a diamond-shaped frame through four sets of rotating shafts, wherein the rotating shafts on the left and right sides of the diamond-shaped frame are rotatably connected to the bottom of the support column, the rotating shaft at the upper end of the diamond-shaped frame is rotatably connected to the third slider, and the rotating shaft at the lower end of the diamond-shaped frame is rotatably connected to the bottom plate of the support frame, wherein a support spring is connected between the rotating shafts on the left and right sides of the diamond-shaped frame.

[0009] Optionally, an electromechanical equipment protection device as described in any of the above, wherein a transverse telescopic rod is also provided on the outer side of the mounting plate, and both ends of the transverse telescopic rod are slidably connected in the longitudinal track on the outer side of the mounting plate, the slider is sleeved on the transverse telescopic rod, and springs are respectively sleeved along the transverse telescopic rod between the slider and the sliding end of the transverse telescopic rod and between each slider, and the ends of the springs abut against each slider to drive each slider to be evenly distributed along the transverse telescopic rod.

[0010] Optionally, an electromechanical equipment protection device as described in any of the above, wherein the roller comprises: an inner wheel core, which is fixedly connected to the end of the sliding rod; an outer wheel body, which is sleeved outside the inner wheel core and rolls along the transverse track or the longitudinal track; wherein the outer wall of the inner wheel core and the inner wall of the outer wheel body are also respectively provided with fixed grooves, and the two ends of the vortex spring are respectively clamped and fixed in the fixed grooves; during the rolling of the outer wheel body, the vortex spring is tightened accordingly with the rolling of the wheel body, providing an opposing torque to the sliding rod connected to the inner wheel core, driving the mounting plate to maintain a balanced state.

[0011] Optionally, an electromechanical equipment protection device as described in any of the above, wherein the mounting plate is a quadrilateral with an area smaller than the bottom plate of the supporting frame, and each side of the mounting plate is symmetrically arranged with the above-mentioned: suspension connecting arm, elastic supporting structure, slider, transverse telescopic rod, and spring.

[0012] Optionally, in any of the above electromechanical equipment protection devices, the support frame is only provided with the base plate and the transverse rail and the longitudinal rail fixedly connected to the base plate.

[0013] Optionally, in any of the above electromechanical equipment protection devices, the support frame is configured as a closed rectangular structure, and the transverse track and the longitudinal track are embedded in the edge of the inner wall.

[0014] Optionally, in an electromechanical equipment protection device as described in any of the above, the elastic support structures arranged around the mounting plate respectively connect the rotating shafts at the bottom of their diamond-shaped frames to the same support platform through universal joints, and rollers are provided at the bottom of the support platform for rolling on the bottom plate of the support frame or directly fixed at the center position of the bottom plate of the support frame. Beneficial Effects

[0015] The electromechanical equipment protection device provided by the present application includes a transverse track and a longitudinal track arranged in a support frame, and a mounting plate 1 connected between the track and the bottom plate of the support frame through an adaptive support system. The present application uses a suspension connecting arm that adaptively moves along the track, and an elastic support structure 6 that is connected between the mounting plate and the bottom plate of the support frame to support the electromechanical equipment on the mounting plate 1. The structure accumulates force accordingly to follow the vibration of the equipment during operation and the distribution state of the weight of the equipment, and provides a counteracting torque, driving the mounting plate 1 to maintain the electromechanical equipment loaded thereon in a balanced state. The present application utilizes a slideway and an elastic structure to balance and suspend the equipment mounting plate in the protection device. On the one hand, it can adaptively offset the vibration of the equipment and keep the equipment in a more horizontal placement state. The present application does not require a complex drive system and can effectively reduce the installation cost of the electromechanical equipment protection device.

[0016] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent from the description, or may be understood by practicing the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the accompanying drawings: Figure 1 It is a structural schematic diagram of the electromechanical equipment protection device of the present application; Figure 2It is a schematic diagram of the internal structure of the roller structure in the electromechanical equipment protection device of the present application; Figure 3 It is a schematic diagram of the top view of the structure of the electromechanical equipment protection device in this application; In the figure, 1 represents a mounting plate; 11 represents a slide groove; 2 represents a slider; 3 represents a spring; 4 represents a support column; 5 represents a sliding rod; 6 represents an elastic supporting structure; 61 represents a rotating shaft; 62 represents a connecting rod; 63 represents a supporting spring; 7 represents a roller; 71 represents an outer wheel body; 72 represents a volute spring; and 73 represents an inner wheel core. DETAILED DESCRIPTION

[0018] In order to make the purpose and technical solution of the embodiment of the present application clearer, the technical solution of the embodiment of the present application will be clearly and completely described in conjunction with the drawings of the embodiment of the present application. Obviously, the described embodiment is a part of the embodiment of the present application, not all of the embodiments. Based on the described embodiment of the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0019] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as generally understood by those skilled in the art to which this application belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless defined as herein.

[0020] The meaning of "and / or" described in this application means that the situations where each exists alone or both exist at the same time are included.

[0021] The meaning of "inside" and "outside" in this application refers to the direction from the track to the center of the mounting plate as inside, and vice versa as outside, relative to the support frame itself; rather than a specific limitation on the device mechanism of this application.

[0022] The meaning of "left and right" in this application refers to that when the user is facing the support frame, the left side of the user is left and the right side of the user is right, rather than a specific limitation on the device mechanism of this application.

[0023] The term “connection” as used in this application may mean a direct connection between components or an indirect connection between components via other components.

[0024] The meaning of "up and down" in this application refers to that when the user is facing the support frame, the direction from the bottom plate of the support frame to the sliding rod is up, and the opposite direction is down, rather than a specific limitation on the device mechanism of this application.

[0025] Figure 1 A mechanical and electrical equipment protection device according to the present application comprises: A support frame, wherein a transverse track is disposed on the top of the support frame, and longitudinal tracks are disposed at the four corners of the support frame; A mounting plate 1, which is horizontally arranged in the supporting frame; An adaptive support system, which is connected between the mounting plate 1 and the support frame, includes a suspension connecting arm connected to the transverse track and the longitudinal track, and an elastic support structure 6 connected between the mounting plate 1 and the bottom plate of the support frame to lift the electromechanical equipment on the mounting plate 1; A roller 7 is installed on the suspension connecting arm. The roller rolls along the transverse track and / or the longitudinal track from a balanced position in an initial state in response to the vibration of the electromechanical equipment and the weight distribution of the equipment. During the rolling process, the roller 7 accumulates force inside as the wheel body rolls to provide a counteracting torque, thereby driving the mounting plate 1 to maintain a balanced state.

[0026] Therefore, when the ground at the installation location is inclined, the electromechanical equipment retaining device of the present application can use the gravity of the equipment to apply pressure to the adaptive support system on the lower side of the inclination direction, and at the same time reduce the pressure on the adaptive support system on the opposite side of the inclination direction. At this time, since the rollers 7 and the elastic support structure 6 inside the adaptive support system store force accordingly and provide mutually opposing torques, the installation plate 1 and the equipment inside it can be installed in a nearly horizontal state through the mutual cooperation of the upper and lower sides.

[0027] In specific implementation, the suspension connecting arm used in the present application may be configured to include: A sliding rod 5, one end of which is connected to the transverse track, and the other end of which is connected to the longitudinal track, and the middle of the sliding rod 5 is hollowed out to form a guide rail structure; The top of the support column 4 is slidably connected to the guide rail structure hollowed out in the middle of the sliding rod 5, and the bottom of the support column 4 is rotatably connected to the elastic support structure 6; The support column 4 is rotatably connected to the outer side of the mounting plate 1 , and the pulling force on the mounting plate 1 is dynamically adjusted through the movement and deflection of the sliding pull rod 5 and the elastic support structure 6 .

[0028] For example, on the sliding rods 5 installed in each direction of the equipment, the rollers 7 store force through their internal structures respectively, and the mounting plate 1 is maintained in a horizontal equilibrium state inside the device through balanced force storage in each direction of the equipment. When the center of gravity of the equipment shifts to the left, the support column on the left side of the mounting plate is pulled down by the gravity of the goods, driving the two ends of the sliding rod to roll along the track, causing the original force storage balance of the rollers 7 on the sliding rod 5 to be broken. At this time, the roller drives the support column to rotate in the opposite direction of the center of gravity of the equipment to level the mounting plate. At the same time, after the force storage balance state is broken, the height of the bottom of the mounting plate 1 at different positions relative to the bottom plate of the support frame also changes accordingly. On the side with a lower height, the elastic support structure 6 resists the extrusion force and provides a lifting torque in the corresponding direction to the mounting plate; and on the side with a higher height, the elastic support mechanism is stretched, which will provide a downward pulling torque in the corresponding direction of the mounting plate. Therefore, on the one hand, the mounting plate can be kept horizontal by the torque provided after the roller force balance in the suspension system is broken. On the other hand, the mounting plate can be kept in an appropriate suspension position by lifting or pulling the elastic support structure in all directions, ensuring that the center of gravity of the equipment is stable and will not overturn.

[0029] In order to ensure that the equipment on the mounting plate is subjected to balanced forces around the periphery, the present application generally arranges the suspension connecting arms symmetrically in pairs on each side of the mounting plate 1. In order to ensure the rotational freedom of the support column and the elastic support structure 6, the present application generally also provides slide grooves 11 corresponding to the suspension connecting arms in each direction on the sides of the mounting plate 1. The slide grooves 11 can be slidably arranged with sliders 2, and the outer shell of the sliders 2 is used to realize the rotational connection with the lower part of the support column 4, and the sides of the mounting plate 1 are symmetrically connected to the bottom of the suspension system through the sliders 2.

[0030] In order to facilitate the connection of the elastic support structure 6 and the stress balance supply, the present application can further set a third slider on the mounting plate 1, located between the aforementioned two side support columns 4, and connect the top of the elastic support structure 6 to the third slider. Thus, the elastic support structure 6 can be connected to a diamond frame through: 4 connecting rods 62, and four groups of rotating shafts 61 respectively set at each end thereof, wherein the rotating shafts 61 on the left and right sides of the diamond frame are respectively rotatably connected to the bottom of the support column 4, the rotating shaft 61 on the upper end of the diamond frame is rotatably connected to the third slider, and the rotating shaft 61 on the lower end of the diamond frame is rotatably connected to the bottom plate of the support frame, so that the supporting spring 63 connected between the rotating shafts 61 on the left and right sides of the diamond frame is contracted inwardly to pull the two ends of the connecting rod 62 inwardly to support the upper and lower ends of the diamond structure to a suitable height.

[0031] To further ensure that the above-mentioned sliders 2 remain stable, the present application can also be respectively provided with transverse telescopic rods around the outer side of the mounting plate 1. On each side of the mounting plate, the two ends of the transverse telescopic rod can be slidably connected to the longitudinal track outside the mounting plate 1 through a pulley or roller structure. Mounting seats can be respectively provided at both ends of the telescopic rod to fix the pulley or roller structure, and the sliders 2 are respectively sleeved on each telescopic rod. Springs 3 can be sleeved along the transverse telescopic rod between the slider 2 and the mounting seats at the ends of the transverse telescopic rod and between the sliders 2. By abutting the ends of the springs 3 against the sliders 2, the sliders 2 are driven to be evenly distributed along the transverse telescopic rod, and the compression and extension of the springs are used to increase the resistance when the sliders slide along the telescopic rods. In the present application, the springs on the telescopic rods can be installed between the sliders in a state of neither compression nor extension to reduce their stored force, so that through the stored force difference between the roller and the spring, while maintaining the position of the mounting seat through the spring, the top suspension function is not affected. When the center of gravity of the equipment shifts and causes the mounting plate to tilt, the telescopic rod tilts accordingly, and the spring on it pulls the slider to the corresponding position. At the same time, the roller pulls the suspension system and the elastic support structure at the bottom supports the mounting plate to maintain a relatively balanced position to offset the tilt of the equipment. Thus, the system can respond to the reciprocating deflection of the center of gravity of the equipment caused by the working vibration of the equipment in the above manner, keep the equipment in a proper balanced state in real time, reduce its vibration, reduce vibration noise and interference with the operation of the equipment.

[0032] Reference Figure 2 As shown, the roller 7 used in the present application can be specifically configured to include: The inner wheel core 73 is fixedly connected to the end of the sliding rod 5 and can generally be configured as a cylindrical structure with grooves on the surface; The outer wheel body 71 is sleeved outside the inner wheel core 73 and is set to be annular, and another groove structure is set on the inner side of the annular structure. The outer diameter of the outer wheel body 71 can be set to be consistent with the distance between the inner walls of the track through an inflatable device. As a result, the roller can roll along the transverse track or the longitudinal track, and the two ends of the spiral spring 72 are respectively clamped and fixed in the roller through the fixing grooves respectively set on the outer wall of the inner wheel core 73 and the inner wall of the outer wheel body 71. During the rolling process of the outer wheel body 71, one end of the spiral spring 72 rotates accordingly with the rolling of the outer wheel body, and the inner end of the spiral spring 72 is kept in a relatively fixed position by the inner wheel core 73. The rotation difference between the two ends causes the spiral spring 72 to accumulate force and tighten, thereby providing a counteracting torque to the sliding pull rod 5 connected to the inner wheel core 73 through the elasticity of the spiral spring 72, driving the mounting plate 1 to maintain a balanced state.

[0033] In order to ensure that the protective device of the present application can respond evenly to the center of gravity deflection of the equipment in all directions, the present application generally makes the mounting plate 1 a quadrilateral with an area smaller than the bottom plate of the supporting frame, and correspondingly, the above-mentioned: suspension connecting arm, elastic support structure 6, slider 2, transverse telescopic rod, spring 3 are symmetrically arranged on each side of the four sides of the mounting plate 1.

[0034] In the device of the present application, the support frame can be set as an open frame structure with a bottom plate, a transverse track and a longitudinal track to facilitate the interactive connection between the device and the outside world. For relatively independent electromechanical equipment, the present application can also flexibly set the support frame as a closed rectangular structure, using its inner wall to provide more comprehensive protection for the internal electromechanical equipment, and the edge positions of each inner wall in the closed structure can be respectively embedded with the above-mentioned transverse track and longitudinal track.

[0035] In order to ensure that the elastic support structure 6 provided in all directions at the bottom of the mounting plate 1 can provide lifting support in a more balanced manner, the present application can connect the rotating shafts 61 at the bottom of the diamond-shaped frame in the elastic support structure 6 provided around the mounting plate 1 to the same supporting platform through universal couplings. The bottom of the supporting platform can roll on the bottom plate of the supporting frame through rollers to provide more flexible support, or the bottom of the supporting platform can be directly fixed at the center of the bottom plate of the supporting frame by bolts or welding to improve the balance of the lifting support in all directions of the mounting plate.

[0036] The above is only an implementation method of the present application, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present application. It should be pointed out that for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present application, which all belong to the protection scope of the present application.

Claims

1. A mechanical and electrical equipment protection device, comprising: A support frame, wherein a transverse track is disposed on the top of the support frame, and longitudinal tracks are disposed at the four corners of the support frame; A mounting plate (1) arranged horizontally in the supporting frame; An adaptive support system connected between the mounting plate (1) and the support frame, comprising a suspension connecting arm connected to the transverse track and the longitudinal track, and an elastic support structure (6) connected between the mounting plate (1) and the bottom plate of the support frame to support the electromechanical equipment on the mounting plate (1); A roller (7) is mounted on the suspension connecting arm. The roller rolls along the transverse track and / or the longitudinal track from a balanced position in an initial state in response to the vibration of the electromechanical equipment and the distribution of the equipment's own weight. During the rolling process, the roller (7) accumulates force in response to the rolling of the wheel body to provide a counteracting torque, thereby driving the mounting plate (1) to maintain a balanced state.

2. The electromechanical equipment protection device according to claim 1, characterized in that: The suspension connecting arm comprises: A sliding rod (5), one end of which is connected to the transverse track and the other end of which is connected to the longitudinal track, and the middle of the sliding rod (5) is hollowed out to form a guide rail structure; A support column (4), the top of which is slidably connected to a guide rail structure hollowed out in the middle of the sliding pull rod (5), and the bottom of the support column (4) is rotatably connected to the elastic support structure (6); The support column (4) is rotatably connected to the outside of the mounting plate (1), and the support for the mounting plate (1) is dynamically adjusted through the movement and deflection of the sliding pull rod (5) and the elastic support structure (6).

3. The electromechanical equipment protection device according to claim 2, characterized in that: The suspension connecting arms are symmetrically arranged on each side of the mounting plate (1), and a slide groove (11) is also arranged on the side of the mounting plate (1), a slider (2) is slidably arranged on the slide groove (11), and the lower part of the support column (4) is rotatably connected to the sliders (2) on both sides of the mounting plate (1).

4. The electromechanical equipment protection device according to claim 3, characterized in that: A third sliding block is also provided between the supporting columns (4) on both sides of the mounting plate (1); The elastic support structure (6) comprises: Four connecting rods (62) are connected at each end to form a diamond-shaped frame through four sets of rotating shafts (61), wherein the rotating shafts (61) on the left and right sides of the diamond-shaped frame are rotatably connected to the bottom of the support column (4), the rotating shaft (61) at the upper end of the diamond-shaped frame is rotatably connected to the third slider, and the rotating shaft (61) at the lower end of the diamond-shaped frame is rotatably connected to the bottom plate of the support frame, wherein a support spring (63) is connected between the rotating shafts (61) on the left and right sides of the diamond-shaped frame.

5. The electromechanical equipment protection device according to claim 4, characterized in that: A transverse telescopic rod is also provided on the outside of the mounting plate (1), and both ends of the transverse telescopic rod are slidably connected to the longitudinal track on the outside of the mounting plate (1). The slider (2) is sleeved on the transverse telescopic rod, and springs (3) are respectively sleeved along the transverse telescopic rod between the slider (2) and the sliding end of the transverse telescopic rod and between each slider (2). The ends of the springs (3) abut against each slider (2) to drive each slider (2) to be evenly distributed along the transverse telescopic rod.

6. The electromechanical equipment protection device according to claims 1-5, characterized in that: The roller (7) comprises: An inner wheel core (73) fixedly connected to the end of the sliding rod (5); An outer wheel body (71) is sleeved outside the inner wheel core (73) and rolls along the transverse track or the longitudinal track; The outer wall of the inner wheel core (73) and the inner wall of the outer wheel body (71) are respectively provided with fixing grooves, and the two ends of the spiral spring (72) are respectively clamped and fixed in the fixing grooves; During the rolling process of the outer wheel body (71), the scroll spring (72) accumulates force and tightens accordingly with the rolling of the wheel body, providing an opposing torque to the sliding pull rod (5) connected to the inner wheel core (73), thereby driving the mounting plate (1) to maintain a balanced state.

7. The electromechanical equipment protection device according to claims 1-5, characterized in that: The mounting plate (1) is a quadrilateral with an area smaller than the bottom plate of the supporting frame, and each side of the mounting plate (1) is symmetrically provided with the following: a suspension connecting arm, an elastic supporting structure (6), a sliding block (2), a transverse telescopic rod, and a spring (3).

8. The electromechanical equipment protection device according to claim 7, characterized in that: The support frame is only provided with the bottom plate and the transverse rail and the longitudinal rail fixedly connected to the bottom plate.

9. The electromechanical equipment protection device according to claim 7, characterized in that: The support frame is configured as a closed rectangular parallelepiped structure, and the transverse track and the longitudinal track are embedded in the edge of the inner wall of the support frame.

10. The electromechanical equipment protection device according to claim 7, characterized in that: The elastic support structures (6) arranged around the mounting plate (1) respectively have the rotating shafts (61) at the bottom of the diamond-shaped frames respectively connected to the same support platform via universal couplings, and the bottom of the support platform is provided with rollers for rolling on the bottom plate of the support frame or directly fixed at the center position of the bottom plate of the support frame.

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