Foot margin device with inflatable trundles

Abstract

The utility model discloses a foot margin device with an inflatable caster, which comprises a support column, a mounting rack and the inflatable caster, the bottom end of the support column is provided with a foot margin, the mounting rack is connected to one side of the support column, the inflatable caster is arranged on the mounting rack, the inflatable caster is provided with an inflatable interface, and the inflatable interface is connected with the inflatable caster. The inflatable caster is configured to be deflated through the inflation connector until the bottom is higher than the foot margin or inflated through the inflation connector until the bottom is lower than the foot margin. According to the foot margin device, switching between a mode of supporting the foot margin on the ground and a mode of supporting the air inflation caster on the ground is achieved by inflating and deflating the air inflation caster, the structure is simple and reliable, and cost is lower.

Description

Technical Field

[0001] The utility model relates to a ground anchor device, in particular to a ground anchor device with pneumatic casters. Background Art

[0002] The foot only has the function of fixed load bearing and cannot be moved directly, while the caster is easy to move but has insufficient fixed load bearing capacity. Existing foot with casters is usually provided with a lifting mechanism. When the foot is needed, the foot is grounded through the lifting mechanism and the caster is lifted; when the caster is needed, the foot is lifted through the lifting mechanism and the caster is grounded.

[0003] A Chinese utility model patent with publication number CN210593512U discloses a ground caster for a liquid dispensing tank, comprising a mounting plate, a roller and a lifting mechanism, wherein the lifting mechanism comprises a foot cup, a lifting locking double nut, a lifting screw and an outer screw tube, wherein the outer screw tube is fixed below the mounting plate, and a lifting screw is mounted on the foot cup, wherein the upper end of the lifting screw is inserted into the outer screw tube and tightened with the lifting locking double nut. However, the lifting mechanism has the problems of complex structure, high cost and difficulty in operation. Utility Model Content

[0004] The utility model aims at the above problems existing in the prior art and provides a ground anchor device with pneumatic casters.

[0005] In order to achieve the above design objectives, the utility model adopts the following technical solutions:

[0006] The utility model provides a ground anchor device with pneumatic casters, comprising:

[0007] A support column, wherein the bottom end of the support column is provided with a foot;

[0008] A mounting frame connected to one side of the support column;

[0009] An inflatable caster, wherein the inflatable caster is arranged on the mounting frame and an inflatable interface is arranged on the inflatable caster;

[0010] The inflatable caster is configured to be deflated through the inflation interface until the bottom is higher than the ground foot, or to be inflated through the inflation interface until the bottom is lower than the ground foot.

[0011] In some embodiments of the present invention, the mounting frame includes a horizontal rotating shaft, and the inflatable caster is rotatably connected to the rotating shaft.

[0012] In some embodiments of the present invention, a steering shaft is provided on the pillar, and the steering shaft is arranged above the mounting frame.

[0013] In some embodiments of the present invention, a height adjustment structure is provided on the pillar.

[0014] In some embodiments of the present invention, the pneumatic caster includes a wheel hub and a pneumatic tire, the wheel hub is connected to the mounting frame, and the inflation interface is connected to the pneumatic tire.

[0015] In some embodiments of the present invention, a two-way air pump is further included, and the two-way air pump is connected to the inflation interface through an air pipe.

[0016] In some embodiments of the utility model, the mounting frame includes an axle seat connected to the pillar, a universal shaft connected to the axle seat, and a wheel frame connected to the bottom end of the universal shaft, and the inflatable caster is rotatably mounted on the wheel frame.

[0017] In some embodiments of the utility model, the wheel frame includes two vertical plates, a horizontal caster shaft is connected between the two vertical plates, and the inflatable caster is rotatably mounted on the caster shaft.

[0018] In some embodiments of the present invention, when the pneumatic caster is inflated to a point where the bottom is lower than the ground foot, a distance is left between the caster and the mounting frame.

[0019] In some embodiments of the utility model, two pillars are provided, the feet of the bottom ends of the two pillars are flush, and the mounting frame is connected between the two pillars.

[0020] Compared with the prior art, the advantages and positive effects of the utility model are:

[0021] The anchor at the bottom of the pillar and the inflatable caster arranged on the mounting frame are used to support the ground. The diameter of the inflatable caster is reduced after the air is deflated. At this time, the anchor is supported on the ground and the inflatable caster is suspended in the air; the diameter of the inflatable caster is increased after the air is inflated, and the bottom falls to the ground. Continuing to inflate can lift the anchor, and at this time the inflatable caster is supported on the ground, which is convenient for movement; by inflating and deflating the inflatable caster, the two modes of supporting the ground with the anchor and supporting the ground with the inflatable caster can be switched. The operation is convenient, the structure is simple and reliable, no additional lifting mechanism is required, and the cost is lower.

[0022] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become more clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 is a schematic diagram of the pneumatic caster when the pneumatic caster is deflated in the first embodiment of the ground anchor device with pneumatic casters;

[0025] Figure 2 is a schematic diagram of the pneumatic caster when the pneumatic caster is inflated in the first embodiment of the ground anchor device with pneumatic casters;

[0026] Figure 3 It is a schematic diagram of a first embodiment of a ground anchor device with pneumatic casters in which a column is provided with a steering shaft and a height adjustment structure;

[0027] Figure 4 It is a schematic structural diagram of the pneumatic caster in the first embodiment of the ground anchor device with pneumatic casters;

[0028] Figure 5 This is one of the schematic diagrams of the pneumatic caster when the pneumatic caster is deflated in the second embodiment of the ground anchor device with pneumatic casters;

[0029] Figure 6 This is a second schematic diagram of the pneumatic caster when the pneumatic caster is deflated in the second embodiment of the ground anchor device with pneumatic casters;

[0030] Figure 7 is a schematic diagram of a ground anchor device with pneumatic casters when the pneumatic casters are deflated in Embodiment 3;

[0031] Figure 8 is a schematic diagram of the pneumatic caster in the third embodiment of the ground anchor device with pneumatic casters when the pneumatic casters are inflated;

[0032] Fig. 9 It is a schematic diagram of the pneumatic castors in the fourth embodiment of the ground anchor device with pneumatic castors when the pneumatic castors are inflated.

[0033] In the figure:

[0034] 10. Pillar;

[0035] 11. Ground foot;

[0036] 12. Steering shaft;

[0037] 13. Height adjustment structure; 131. Threaded column; 132. Sleeve;

[0038] 14. Beam;

[0039] 20. Mounting frame;

[0040] 21. Rotating shaft;

[0041] 22. Axle seat;

[0042] 23. Universal joint;

[0043] 24, wheel frame; 241, vertical plate; 242, caster shaft;

[0044] 30. Inflatable casters;

[0045] 31. Inflatable interface;

[0046] 32. Wheel hub;

[0047] 33. Pneumatic tires;

[0048] 40. Trachea. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0050] In the description of the present invention, it should be understood that the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore, should not be understood as a limitation on the present invention.

[0051] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In the description of the implementation method, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0052] In the description of the present invention, unless otherwise specified, “plurality” means two or more. Embodiment 1

[0053] Figures 1 to 4The first embodiment of the anchor device with pneumatic casters provided by the utility model is shown, which includes a support column 10, a mounting frame 20 and a pneumatic caster 30.

[0054] The bottom end of the support 10 is provided with a foot 11. The mounting frame 20 is connected to one side of the support 10, and the pneumatic caster 30 is provided on the mounting frame 20. The pneumatic caster 30 is provided with an inflation interface 31, and the pneumatic caster 30 can be inflated or deflated through the inflation interface 31 to increase or decrease the diameter. The pneumatic caster 30 is configured to deflate through the inflation interface 31 until the bottom is higher than the foot 11, or to be inflated through the inflation interface 31 until the bottom is lower than the foot 11, so as to lift the foot 11.

[0055] The support 10 is used to be connected to the bottom of heavy objects such as equipment, and the anchor 11 and the pneumatic caster 30 are used to support the ground. After the pneumatic caster 30 is deflated, its diameter is reduced, and its bottom is higher than the anchor 11. At this time, the anchor 11 can be supported on the ground, and the pneumatic caster 30 is suspended. The inflation interface 31 can be connected to an air pump through an air pipe, and the pneumatic caster 30 is inflated by the air pump. After the pneumatic caster 30 is inflated, its diameter increases, and the bottom of the pneumatic caster 30 can land on the ground. The pneumatic caster 30 continues to be inflated, and its diameter further increases, so that the anchor 11 can be lifted. At this time, the bottom of the pneumatic caster 30 is lower than the anchor 11, and the pneumatic caster 30 is supported on the ground, and the anchor 11 is suspended, which is convenient for movement. The anchor device realizes the switching between the two modes of the anchor 11 supporting the ground and the pneumatic caster 30 supporting the ground by inflating and deflating the pneumatic caster 30. It is easy to operate, has a simple and reliable structure, does not require an additional lifting mechanism, and has a lower cost.

[0056] The foot 11 can be connected to the bottom end of the pillar 10 by bonding, welding, plugging, fastener connection, integral molding, etc. The foot 11 can be an enlarged end of the pillar 10. The bottom end of the pillar 10 itself can directly serve as the foot 11. The pneumatic caster 30 can adopt a conventional pneumatic wheel.

[0057] In some embodiments, Figure 3 As shown, the mounting frame 20 includes a horizontal rotating shaft 21, and the inflatable caster 30 is rotatably connected to the rotating shaft 21. Specifically, the rotating shaft 21 and the pillar 10 are perpendicular to each other, one end of the rotating shaft 21 is fixedly connected to the pillar 10, and the other end is coaxially connected to the inflatable caster 30, and the inflatable caster 30 can rotate around the rotating shaft 21. The inflatable interface 31 can be set on the side of the inflatable caster 30 away from the pillar 10, which is convenient for connecting the air pipe.

[0058] In some embodiments, Figure 3As shown, a steering shaft 12 may be provided on the support 10, and the steering shaft 12 is provided above the mounting frame 20. The axis of the steering shaft 12 extends vertically, and the steering shaft 12 and the support 10 may be on the same axis. The support 10 can rotate around the axis of the steering shaft 12, and the support 10 can drive the mounting frame 20 and the inflatable caster 30 to rotate around the steering shaft 12, so as to realize the steering of the inflatable caster 30.

[0059] In some embodiments, Figure 3 As shown, a height adjustment structure 13 is provided on the pillar 10, and the height adjustment structure 13 can adopt a conventional height adjustment structure in the art, such as a height adjustment stud, a telescopic rod, etc.

[0060] like Figure 3 In a specific embodiment shown, the height adjustment structure 13 includes a threaded column 131 and a sleeve 132 connected to the pillar 10 . An internal thread matching the threaded column 131 is provided in the sleeve 132 . The length of the pillar 10 can be adjusted by rotating the sleeve 132 .

[0061] In some embodiments, Figure 4 As shown, the pneumatic caster 30 includes a wheel hub 32 and a pneumatic tire 33, wherein the wheel hub 32 is connected to the mounting frame 20, and the pneumatic tire 33 is mounted on the outer ring of the wheel hub 32. Specifically, the wheel hub 32 can be connected to the horizontal rotating shaft 21 through a bearing and rotate around the rotating shaft 21.

[0062] The inflatable interface 31 can be arranged on the wheel hub 32 and communicated with the pneumatic tire 33, or the inflatable interface 31 can be directly arranged on the pneumatic tire 33. Specifically, the inflatable interface 31 can be connected to a sealing cap, and the inflatable interface 31 can be closed by the sealing cap. After the sealing cap is opened, the inflatable interface 31 can be deflated, or the inflatable interface 31 can be connected to an air pipe, and air can be inflated through the air pipe.

[0063] In some embodiments, the anchor device with inflatable casters further includes a bidirectional air pump (not shown), which is connected to the inflation interface 31 via an air pipe 40. The bidirectional air pump can operate in both forward and reverse directions to inflate or deflate the inflatable casters 30 via the air pipe 40. Embodiment 2

[0064] Figure 5 and Figure 6 The second embodiment of the anchor device with pneumatic casters provided by the utility model is shown, which includes a support column 10, a mounting frame 20 and a pneumatic caster 30.

[0065] The bottom end of the support 10 is provided with a foot 11. The mounting frame 20 is connected to one side of the support 10, and the pneumatic caster 30 is provided on the mounting frame 20. The pneumatic caster 30 is provided with an inflation interface 31, and the pneumatic caster 30 can be inflated or deflated through the inflation interface 31 to increase or decrease the diameter. The pneumatic caster 30 is configured to deflate through the inflation interface 31 until the bottom is higher than the foot 11, or to be inflated through the inflation interface 31 until the bottom is lower than the foot 11, so as to lift the foot 11.

[0066] like Figure 5 As shown, the mounting frame 20 includes an axle seat 22 connected to the pillar 10, a universal shaft 23 connected to the axle seat 22, and a wheel frame 24 connected to the bottom end of the universal shaft 23. The universal shaft 23 extends vertically, and the pneumatic caster 30 is rotatably mounted on the wheel frame 24. The universal shaft 23 extends vertically, and the wheel frame 24 and the pneumatic caster 30 can rotate around the universal shaft 23 to achieve steering, which is convenient for movement.

[0067] Specifically, the wheel frame 24 includes two vertical plates 241 , a horizontal caster shaft 242 is connected between the two vertical plates 241 , and the pneumatic caster 30 is rotatably mounted on the caster shaft 242 .

[0068] When the pneumatic caster 30 is inflated to a position where the bottom is lower than the foot 11, there is a gap between the pneumatic caster 30 and the mounting frame 20 to avoid interference with the rotation of the pneumatic caster 30. Specifically, the shaft seat 22 and the universal shaft 23 are located above the pneumatic caster 30. When the pneumatic caster 30 is inflated to a position where the bottom is lower than the foot 11, there is a gap between the top of the pneumatic caster 30 and the shaft seat 22 and the universal shaft 23 above to avoid interference.

[0069] like Figure 6 As shown, the pneumatic caster 30 includes a wheel hub 32 and a pneumatic tire 33, and the pneumatic tire 33 is mounted on the outer ring of the wheel hub 32. The wheel hub 32 can be connected to the caster shaft 242 through a bearing. The inflation interface 31 can be arranged on the wheel hub 32 and communicated with the pneumatic tire 33, and the inflation interface 31 can also be directly arranged on the pneumatic tire 33. Embodiment 3

[0070] Figure 7 and Figure 8 The third embodiment of the anchor device with pneumatic casters provided by the utility model is shown, which includes a support column 10, a mounting frame 20 and a pneumatic caster 30.

[0071] The mounting frame 20 is connected to one side of the pillar 10, and the pneumatic caster 30 is arranged on the mounting frame 20. Two pillars 10 are provided, and the bottom ends of the two pillars 10 are respectively provided with feet 11, and the feet 11 at the bottom ends of the two pillars 10 are flush. The mounting frame 20 is connected between the two pillars 10.

[0072] The inflatable caster 30 is provided with an inflating interface 31, and the inflatable caster 30 can be inflated or deflated through the inflating interface 31 to increase or decrease the diameter. The inflatable caster 30 is configured to be deflated through the inflating interface 31 until the bottom is higher than the foot 11, or to be inflated through the inflating interface 31 until the bottom is lower than the foot 11, so as to lift the foot 11.

[0073] After the inflatable caster 30 is inflated, the two footings 11 can be lifted at the same time, and after the inflatable caster 30 is deflated, the two footings 11 can land at the same time to maintain balance. The footings 11 of the two pillars 10 support at the same time, thereby improving stability.

[0074] In some embodiments, the mounting frame 20 includes a horizontal shaft 21, and the pneumatic caster 30 is rotatably connected to the shaft 21. Specifically, both ends of the shaft 21 are respectively fixedly connected to the two pillars 10, and are perpendicular to the two pillars 10, and the pneumatic caster 30 can rotate around the shaft 21.

[0075] The two pillars 10 and the rotating shaft 21 can be connected to form an "H"-shaped structure, and the tops of the two pillars 10 can be connected to the equipment and other heavy objects to be supported. The tops of the two pillars 10 can be further connected by a crossbeam 14 to form a door-shaped structure, and the crossbeam 14 can be connected to the equipment and other heavy objects to be supported.

[0076] In some embodiments, the top ends of the two pillars 10 may be connected by a crossbeam 14, a steering shaft 12 may be disposed above the crossbeam 14, the axis of the steering shaft 12 extends vertically, and the axis of the steering shaft 12 may pass through the middle of the two pillars 10. The two pillars 10, the mounting frame 20, and the pneumatic caster 30 may rotate around the axis of the steering shaft 12 to achieve steering of the pneumatic caster 30.

[0077] In some embodiments, a height adjustment structure 13 is provided on the pillar 10, and the height adjustment structure can be provided above the crossbeam 14. The height adjustment structure 13 can adopt a conventional height adjustment structure in the art, such as a height adjustment stud, a telescopic rod, and the like.

[0078] In some embodiments, the pneumatic caster 30 includes a wheel hub 32 and a pneumatic tire 33, wherein the pneumatic tire 33 is mounted on the outer ring of the wheel hub 32, and the wheel hub 32 can be connected to the horizontal rotating shaft 21 through a bearing and rotate around the rotating shaft 21. The inflation interface 31 can be provided on the wheel hub 32 and communicated with the pneumatic tire 33, or the inflation interface 31 can be directly provided on the pneumatic tire 33.

[0079] In some embodiments, the anchor device with inflatable casters also includes a bidirectional air pump capable of running in both forward and reverse directions. The bidirectional air pump is connected to the inflation interface 31 through the air pipe 40 to inflate or deflate the inflatable casters 30 through the air pipe 40. Embodiment 4

[0080] Fig. 9 The fourth embodiment of the anchor device with pneumatic casters provided by the utility model is shown, which includes a support column 10, a mounting frame 20 and a pneumatic caster 30.

[0081] The mounting frame 20 is connected to one side of the pillar 10, and the pneumatic caster 30 is arranged on the mounting frame 20. Two pillars 10 are provided, and the bottom ends of the two pillars 10 are respectively provided with feet 11, and the feet 11 at the bottom ends of the two pillars 10 are flush. The mounting frame 20 is connected between the two pillars 10.

[0082] The inflatable caster 30 is provided with an inflating interface 31, and the inflatable caster 30 can be inflated or deflated through the inflating interface 31 to increase or decrease the diameter. The inflatable caster 30 is configured to be deflated through the inflating interface 31 until the bottom is higher than the foot 11, or to be inflated through the inflating interface 31 until the bottom is lower than the foot 11, so as to lift the foot 11.

[0083] After the inflatable caster 30 is inflated, the two footings 11 can be lifted at the same time, and after the inflatable caster 30 is deflated, the two footings 11 can land at the same time to maintain balance. The footings 11 of the two pillars 10 support at the same time, thereby improving stability.

[0084] The mounting frame 20 includes an axle seat 22 connected between two pillars 10, a universal shaft 23 connected to the axle seat 22, and a wheel frame 24 connected to the bottom end of the universal shaft 23. The universal shaft 23 extends vertically, and the pneumatic caster 30 is rotatably mounted on the wheel frame 24. The universal shaft 23 extends vertically, and the wheel frame 24 and the pneumatic caster 30 can rotate around the universal shaft 23 to achieve steering and facilitate movement. Specifically, the wheel frame 24 includes two vertical plates 241, and a horizontal caster shaft 242 is connected between the two vertical plates 241, and the pneumatic caster 30 is rotatably mounted on the caster shaft 242.

[0085] When the pneumatic caster 30 is inflated to a position where the bottom is lower than the foot 11, there is a gap between the pneumatic caster 30 and the mounting frame 20 to avoid interference with the rotation of the pneumatic caster 30. Specifically, the shaft seat 22 and the universal shaft 23 are located above the pneumatic caster 30. When the pneumatic caster 30 is inflated to a position where the bottom is lower than the foot 11, there is a gap between the top of the pneumatic caster 30 and the shaft seat 22 and the universal shaft 23 above to avoid interference.

[0086] The top ends of the two pillars 10 can be further connected by a crossbeam 14 to form a gate-shaped structure, and heavy objects such as equipment to be supported can be connected through the crossbeam 14. The shaft seat 22 of the mounting frame 20 can be set on the crossbeam. Alternatively, the shaft seat 22 can directly serve as a crossbeam connecting the two pillars 10.

[0087] The pneumatic caster 30 includes a wheel hub 32 and a pneumatic tire 33, and the pneumatic tire 33 is mounted on the outer ring of the wheel hub 32. The wheel hub 32 can be connected to the caster shaft 242 through a bearing. The pneumatic interface 31 can be arranged on the wheel hub 32 and communicated with the pneumatic tire 33, and the pneumatic interface 31 can also be directly arranged on the pneumatic tire 33.

[0088] In some embodiments, the anchor device with inflatable casters also includes a bidirectional air pump capable of running in both forward and reverse directions. The bidirectional air pump is connected to the inflation interface 31 through the air pipe 40 to inflate or deflate the inflatable casters 30 through the air pipe 40.

[0089] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, it is still possible for a person skilled in the art to modify the technical solutions described in the above embodiments, or to replace some of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions claimed to be protected by the present invention.

Claims

1. A ground anchor device with pneumatic casters, characterized in that: include: A support column, wherein the bottom end of the support column is provided with a foot; a mounting frame connected to one side of the support column; An inflatable caster, wherein the inflatable caster is arranged on the mounting frame and an inflatable interface is arranged on the inflatable caster; The inflatable caster is configured to be deflated through the inflation interface until the bottom is higher than the ground foot, or to be inflated through the inflation interface until the bottom is lower than the ground foot.

2. The anchor device with pneumatic casters according to claim 1, characterized in that: The mounting frame comprises a horizontal rotating shaft, and the pneumatic caster is rotatably connected to the rotating shaft.

3. The anchor device with pneumatic casters according to claim 1, characterized in that: A steering shaft is arranged on the pillar, and the steering shaft is arranged above the mounting frame.

4. The anchor device with pneumatic casters according to claim 1, characterized in that: The pillar is provided with a height adjustment structure.

5. The anchor device with pneumatic casters according to claim 1, characterized in that: The pneumatic caster comprises a wheel hub and a pneumatic tire, the wheel hub is connected to the mounting frame, and the inflation interface is communicated with the pneumatic tire.

6. The anchor device with pneumatic casters according to claim 1, characterized in that: It also includes a two-way air pump, which is connected to the inflation interface through an air pipe.

7. The anchor device with pneumatic casters according to claim 1, characterized in that: The mounting frame comprises an axle seat connected to the support column, a universal shaft connected to the axle seat, and a wheel frame connected to the bottom end of the universal shaft, and the pneumatic caster is rotatably mounted on the wheel frame.

8. The anchor device with pneumatic casters according to claim 7, characterized in that: The wheel frame comprises two vertical plates, a horizontal caster shaft is connected between the two vertical plates, and the pneumatic caster is rotatably mounted on the caster shaft.

9. The anchor device with pneumatic casters according to claim 7, characterized in that: When the pneumatic caster is inflated until the bottom is lower than the ground foot, a distance is left between the caster and the mounting frame.

10. The anchor device with pneumatic casters according to any one of claims 1 to 9, characterized in that: Two pillars are provided, the feet of the bottom ends of the two pillars are flush with each other, and the mounting frame is connected between the two pillars.

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