Adjustable drip irrigation tape laying device

Abstract

The utility model provides an adjustable drip irrigation tape laying device which comprises a machine frame, a walking assembly, a ditching assembly, a laying assembly and a soil covering assembly, the soil covering assembly, the laying assembly and the machine frame are sequentially connected, the ditching assembly is arranged on the side, close to the machine frame, of the laying assembly, and the walking assembly is arranged below the machine frame; the laying assembly comprises an L-shaped support, a drip irrigation tape reel erecting assembly, a drip irrigation tape reel, a guide pipe and a guide assembly, one end of the guide pipe is connected with the guide assembly, the other end of the guide pipe is rotationally connected with the L-shaped support, and the end, away from the guide pipe, of the L-shaped support is arranged above the rack; and the drip irrigation tape reel is arranged above the L-shaped bracket through the drip irrigation tape reel erecting assembly. The guide pipe and the guide assembly can play a role in guiding and dragging the drip irrigation tape, the situation that the drip irrigation tape is laid unflatly and the free end needs to be fixed manually is prevented, and the digging assembly can control the grooving depth.

Description

Technical Field

[0001] The utility model belongs to the technical field of pipe belt laying, in particular to an adjustable drip irrigation belt laying device. Background Art

[0002] Wheat and corn need to be irrigated in time after sowing to ensure uniform germination and build a high-yield group. In recent years, with the continuous advancement of agricultural modernization, irrigation technology has also been continuously updated. Drip irrigation technology is an efficient and water-saving irrigation method. By laying drip irrigation pipes on the surface, water is dripped directly into the roots of crops, reducing water evaporation and soil surface loss, improving water utilization and reducing irrigation costs.

[0003] Different wheat fields require different spacings for laying drip tapes. If the spacing between two adjacent drip tapes is too close or too far, the irrigation effect will be affected. Although the drip tape laying device in the prior art can simultaneously lay multiple drip tapes, it cannot flexibly adjust the laying spacing between the drip tapes, which reduces the practicability of the device.

[0004] Since there is a certain distance between the drip tape reel and the ground, the drip tape may flutter, entangle, deviate or twist under the action of wind or other external forces during the laying process, causing the drip tape to be unevenly laid and the consistent direction of the drip tape outlet cannot be guaranteed.

[0005] At present, the laying of drip irrigation tape usually adopts power equipment to drive the drip irrigation tape laying device to move forward so as to lay the drip irrigation tape. When the drip irrigation tape laying device is moving, since the drip irrigation tape reel does not rotate, it is also necessary to manually hold the free end of the drip irrigation tape and let the machine move for a period of time. Under a certain amount of soil gravity pressure, the laying work can be carried out smoothly. Utility Model Content

[0006] In view of this, the utility model aims to propose an adjustable drip tape laying device to solve the problem that the drip tape laying device cannot adjust the drip irrigation spacing, the drip tape will flutter, entangle, deviate, and twist during the laying process, causing the drip tape to be laid unevenly, and the free end of the drip tape needs to be manually fixed at the initial stage of laying, wasting manpower.

[0007] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0008] An adjustable drip irrigation tape laying device comprises a frame, a traveling assembly, a trenching assembly, a laying assembly, and a soil covering assembly, wherein the soil covering assembly, the laying assembly, and the frame are connected in sequence, the trenching assembly is arranged on a side of the laying assembly close to the frame, and the traveling assembly is arranged below the frame;

[0009] The laying assembly includes an L-shaped bracket, a drip irrigation tape reel mounting assembly, a drip irrigation tape reel, a guide tube, and a guide assembly. One end of the guide tube is connected to the guide assembly, and the other end of the guide tube is rotatably connected to the L-shaped bracket. The end of the L-shaped bracket away from the guide tube is arranged above the frame, and the drip irrigation tape reel is arranged above the L-shaped bracket through the drip irrigation tape reel mounting assembly.

[0010] Furthermore, the frame includes a first cross bar and a second cross bar, the first cross bar and the second cross bar are arranged in parallel, and a plurality of evenly distributed support bars are arranged between the first cross bar and the second cross bar; the first cross bar is used to connect the laying component, the trenching component, and the covering component, and the second cross bar is used to connect the walking component.

[0011] A first connecting rod connected with the power device is arranged on the second cross bar.

[0012] Preferably, the power unit is a tractor.

[0013] Furthermore, a first connecting plate is provided at the end of the L-shaped bracket, a U-shaped bolt is provided on the first connecting plate, and one end of the L-shaped bracket is arranged on the first crossbar through the U-shaped bolt. The L-shaped bracket is detachably arranged on the first crossbar through the U-shaped bolt, so that the laying assembly, the trenching assembly, and the covering assembly can move horizontally along the first crossbar, thereby adjusting the laying spacing.

[0014] Furthermore, the drip irrigation tape reel erection assembly includes a vertical pole and a U-shaped bracket, the bottom of the vertical pole is arranged on the top of the L-shaped bracket, and the U-shaped bracket is arranged on the top of the vertical pole;

[0015] The two ends of the drip irrigation tape reel are rotatably arranged inside the U-shaped bracket.

[0016] Furthermore, one end of the guide tube is rotatably connected to the L-shaped bracket through a first mounting plate at one end of the L-shaped bracket;

[0017] Both sides of the guide tube are provided with adjustment plates, and the adjustment plates are provided with a number of evenly distributed through holes;

[0018] A tension spring is provided between the guide tube and the L-shaped bracket, one end of the tension spring is fixedly arranged on one side of the L-shaped bracket, and the other end of the tension spring is adjustably arranged on the adjustment plate through a through hole; when the tension spring is fixed on different through holes, the downward force of the soil covering component can be adjusted by the elastic force of the tension spring, so as to adapt to different burying depths and soil covering amounts of the drip irrigation belt.

[0019] The inner diameter of the guide tube is larger than the diameter of the drip tape. When laying the drip tape, pass the drip tape through the guide tube. The guide tube guides the drip tape and prevents the drip tape from floating, winding, deflecting or twisting under the action of wind or other external forces, causing the drip tape to be laid unevenly.

[0020] Furthermore, the guide assembly includes a box body, a driving wheel, and a driven wheel, the top of one side of the box body is connected to an end of the guide tube away from the L-shaped bracket, and the interior of the box body is connected to the interior of the guide tube;

[0021] The driving wheel and the passive wheel are rotatably arranged at both ends on the side wall of the box body, and the drip irrigation belt can pass between the driving wheel and the passive wheel. The driving wheel is arranged on the side away from the guide tube, and the bottom of the driving wheel extends to the bottom of the box body and contacts the ground. The drip irrigation belt extends from the guide tube to the inside of the box body, and passes between the driving wheel and the passive wheel and is pressed under the driving wheel. The driving wheel contacts the ground. During the movement of the drip irrigation belt laying device, the driving wheel rotates, and the passive wheel is driven to rotate under the action of friction, and the driving wheel and the passive wheel rotate in opposite directions, thereby continuously pulling down the drip irrigation belt, and laying it in the groove. While ensuring that the outlet of the drip irrigation belt is in the same direction, it can also avoid the problem that the free end of the drip irrigation belt needs to be manually fixed.

[0022] Furthermore, the driving wheel is provided with anti-skid patterns, which play a friction role on the drip irrigation belt and the passive wheel.

[0023] Furthermore, the covering assembly includes a second connecting plate, a horizontal plate, and two covering plates, wherein one end of the second connecting plate is arranged on the side of the box body away from the guide tube, the other end of the second connecting plate is arranged in the middle of the horizontal plate, and the two covering plates are obliquely arranged at both ends of the horizontal plate.

[0024] Furthermore, the furrowing assembly includes a second connecting rod, a furrowing plow frame, and a furrowing plow, wherein one end of the second connecting rod is arranged on one side of the L-shaped bracket, the second connecting rod is provided with a mounting hole, the furrowing plow frame is arranged on the second connecting rod through the mounting hole, and the furrowing plow is arranged at the bottom of the furrowing plow frame;

[0025] The furrowing plow frame is provided with a plurality of evenly distributed first threaded holes, and the second connecting rod is provided with second threaded holes corresponding to the first threaded holes. Through the cooperation of different first threaded holes and second threaded holes, the height of the furrowing plow frame and the furrowing plow can be adjusted, thereby controlling the furrowing depth.

[0026] Furthermore, the walking assembly is arranged below the second cross bar, and the walking assembly includes a second mounting plate and a walking wheel. The second mounting plate is arranged below the second cross bar, and the walking wheel is rotatably arranged below the second cross bar through the second mounting plate.

[0027] Preferably, two walking assemblies are provided.

[0028] Compared with the prior art, the adjustable drip irrigation tape laying device described in the utility model has the following advantages:

[0029] (1) The L-shaped bracket described in the utility model can move on the first cross bar, and the distance between multiple L-shaped brackets can be adjusted to adapt to different drip irrigation spacings;

[0030] (2) The utility model can adjust the downward force of the soil covering component through the different elastic forces of the tension spring, so as to be suitable for different burying depths and soil covering amounts of the drip irrigation belt;

[0031] (3) The guide tube described in the utility model can not only guide the drip irrigation tape, but also prevent the drip irrigation tape from floating, winding, deflecting or twisting under the action of wind or other external forces, causing the drip irrigation tape to be laid unevenly;

[0032] (4) The driving wheel and the passive wheel described in the utility model can guide the drip irrigation belt to ensure that the outlet of the drip irrigation belt is in the same direction, and also play a pulling role on the drip irrigation belt, avoiding the problem of manual fixation of the free end of the drip irrigation belt, which wastes manpower;

[0033] (5) The furrowing plow frame and furrowing plow described in the utility model can adjust the height on the second connecting rod to control the furrowing depth. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0035] Figure 1 It is a side view schematic diagram of an adjustable drip irrigation tape laying device according to an embodiment of the utility model;

[0036] Figure 2 It is a top view schematic diagram of an adjustable drip irrigation tape laying device according to an embodiment of the utility model;

[0037] Figure 3 It is a schematic diagram of a drip irrigation tape reel erection assembly of an adjustable drip irrigation tape laying device according to an embodiment of the utility model;

[0038] Figure 4 This is a schematic diagram of the interior of a guide assembly of an adjustable drip irrigation tape laying device described in an embodiment of the utility model.

[0039] Description of reference numerals:

[0040] 1. L-shaped bracket; 2. drip irrigation tape reel; 3. guide tube; 4. first cross bar; 5. second cross bar; 6. support rod; 7. first connecting rod; 8. first connecting plate; 9. U-shaped bolt; 10. vertical pole; 11. U-shaped bracket; 12. first mounting plate; 13. adjustment plate; 14. tension spring; 15. drip irrigation tape; 16. box body; 17. driving wheel; 18. driven wheel; 19. second connecting plate; 20. horizontal plate; 21. covering plate; 22. second connecting rod; 23. furrowing plow frame; 24. furrowing plow; 25. first threaded hole; 26. second mounting plate; 27. walking wheel. DETAILED DESCRIPTION

[0041] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0042] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model 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 cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0044] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0045] like Figures 1 to 4As shown, an adjustable drip irrigation tape laying device includes a frame, a traveling assembly, a trenching assembly, a laying assembly, and a soil covering assembly. The soil covering assembly, the laying assembly, and the frame are connected in sequence, the trenching assembly is arranged on a side of the laying assembly close to the frame, and the traveling assembly is arranged below the frame;

[0046] The laying assembly includes an L-shaped bracket 1, a drip irrigation tape reel erecting assembly, a drip irrigation tape reel 2, a guide tube 3, and a guide assembly. One end of the guide tube 3 is connected to the guide assembly, and the other end of the guide tube 3 is rotatably connected to the L-shaped bracket 1. The end of the L-shaped bracket 1 away from the guide tube 3 is arranged above the frame, and the drip irrigation tape reel 2 is arranged above the L-shaped bracket 1 through the drip irrigation tape reel erecting assembly.

[0047] The frame includes a first cross bar 4 and a second cross bar 5. The first cross bar 4 and the second cross bar 5 are arranged in parallel, and a plurality of evenly distributed support bars 6 are arranged between the first cross bar 4 and the second cross bar 5. The first cross bar 4 is used to connect the laying component, the trenching component, and the covering component, and the second cross bar 5 is used to connect the walking component.

[0048] The second cross bar 5 is provided with a first connecting rod 7 connected to the power device.

[0049] Preferably, the power unit is a tractor.

[0050] The end of the L-shaped bracket 1 is provided with a first connecting plate 8, and the first connecting plate 8 is provided with a U-shaped bolt 9, and one end of the L-shaped bracket 1 is set on the first crossbar 4 through the U-shaped bolt 9. The L-shaped bracket 1 is detachably set on the first crossbar 4 through the U-shaped bolt 9, so that the laying assembly, the trenching assembly, and the covering assembly can move horizontally along the first crossbar 4, thereby adjusting the laying spacing.

[0051] The drip irrigation tape reel erection assembly includes a vertical pole 10 and a U-shaped bracket 11. The bottom of the vertical pole 10 is arranged on the top of the L-shaped bracket 1, and the U-shaped bracket 11 is arranged on the top of the vertical pole 10.

[0052] Both ends of the drip irrigation tape reel 2 are rotatably arranged inside the U-shaped bracket 11 .

[0053] One end of the guide tube 3 is rotatably connected to the L-shaped bracket 1 through a first mounting plate 12 at one end of the L-shaped bracket 1;

[0054] An adjustment plate 13 is provided on both sides of the guide tube 3, and a plurality of evenly distributed through holes are provided on the adjustment plate 13;

[0055] A tension spring 14 is provided between the guide tube 3 and the L-shaped bracket 1, one end of the tension spring 14 is fixedly arranged on one side of the L-shaped bracket 1, and the other end of the tension spring 14 is adjustably arranged on the adjustment plate 13 through a through hole; when the tension spring 14 is fixed on different through holes, the downward force of the covering component can be adjusted by the elastic force of the tension spring 14, so as to adapt to different burial depths and covering amounts of the drip irrigation belt 15.

[0056] The inner diameter of the guide tube 3 is larger than the diameter of the drip irrigation tape 15. When the drip irrigation tape 15 is laid, the drip irrigation tape 15 is passed through the guide tube 3. The guide tube 3 guides the drip irrigation tape 15 and prevents the drip irrigation tape 15 from floating, winding, deflecting or twisting under the action of wind or other external forces, causing the drip irrigation tape 15 to be laid unevenly.

[0057] The guide assembly includes a box body 16, a driving wheel 17, and a driven wheel 18. The top of one side of the box body 16 is connected to the end of the guide tube 3 away from the L-shaped bracket 1, and the inside of the box body 16 is connected to the inside of the guide tube 3;

[0058] The two ends of the driving wheel 17 and the passive wheel 18 are rotatably arranged on the side wall of the box body 16, and the drip irrigation belt 15 can pass between the driving wheel 17 and the passive wheel 18. The driving wheel 17 is arranged on the side away from the guide tube 3, and the bottom of the driving wheel 17 extends to the bottom of the box body 16 and contacts the ground. The drip irrigation belt 15 extends from the guide tube 3 to the inside of the box body 16, and passes between the driving wheel 17 and the passive wheel 18 and is pressed under the driving wheel 17. The driving wheel 17 contacts the ground. During the movement of the drip irrigation belt laying device, the driving wheel 17 rotates, and the passive wheel 18 is driven to rotate under the action of friction, and the driving wheel 17 and the passive wheel 18 rotate in opposite directions, thereby continuously pulling down the drip irrigation belt 15, and laying it in the groove, while ensuring that the outlet of the drip irrigation belt 15 is in the same direction, it can also avoid the problem that the free end of the drip irrigation belt 15 needs to be manually fixed.

[0059] The driving wheel 17 is provided with anti-skid patterns, which play a friction role on the drip irrigation belt 15 and the driven wheel 18.

[0060] The covering assembly includes a second connecting plate 19, a horizontal plate 20, and two covering plates 21. One end of the second connecting plate 19 is arranged on the side of the box body 16 away from the guide pipe 3, and the other end of the second connecting plate 19 is arranged in the middle of the horizontal plate 20. The two covering plates 21 are obliquely arranged at both ends of the horizontal plate 20.

[0061] The furrowing assembly includes a second connecting rod 22, a furrowing plow frame 23, and a furrowing plow 24. One end of the second connecting rod 22 is arranged on one side of the L-shaped bracket 1. The second connecting rod 22 is provided with a mounting hole. The furrowing plow frame 23 is arranged on the second connecting rod 22 through the mounting hole. The furrowing plow 24 is arranged at the bottom of the furrowing plow frame 23.

[0062] The furrowing plow frame 23 is provided with a plurality of evenly distributed first threaded holes 25, and the second connecting rod 22 is provided with second threaded holes corresponding to the first threaded holes 25. Through the cooperation of different first threaded holes 25 and second threaded holes, the height of the furrowing plow frame 23 and the furrowing plow 24 can be adjusted, thereby controlling the furrowing depth.

[0063] The walking assembly is arranged below the second cross bar 5 , and the walking assembly includes a second mounting plate 26 and a walking wheel 27 . The second mounting plate 26 is arranged below the second cross bar 5 , and the walking wheel 27 is rotatably arranged below the second cross bar 5 through the second mounting plate 26 .

[0064] Preferably, two walking assemblies are provided.

[0065] In a specific implementation, the drip irrigation tape laying device is connected to the tractor through the first connecting rod 7, and the height of the furrowing plow 24 is adjusted according to the required furrowing depth. According to the laying spacing, the spacing between two adjacent laying components is adjusted by the U-bolt 9, and the free end of the drip irrigation tape 15 is extended into the box body 16 along the guide tube 3, and then passed between the driving wheel 17 and the passive wheel 18 and pressed under the driving wheel 17. According to the furrowing depth, the fixed position of the tension spring 14 is adjusted. If the groove is deep, the tension spring 14 is fixed on the through hole below, and if the groove is shallow, the tension spring 14 is fixed on the through hole above. The downward gravity of the covering component is adjusted to adapt to the groove depth and adjust the covering amount. The tractor moves forward, the furrowing plow 24 moves forward to dig a trench, and the drip irrigation tape 15 is laid in the groove under the traction of the guide component. After the laying is completed, the covering plate 21 located at the rear is covered with soil, thereby completing the laying of the drip irrigation tape 15.

[0066] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An adjustable drip irrigation tape laying device, characterized in that: It includes a frame, a traveling assembly, a trenching assembly, a laying assembly, and a soil covering assembly, wherein the soil covering assembly, the laying assembly, and the frame are connected in sequence, the trenching assembly is arranged on a side of the laying assembly close to the frame, and the traveling assembly is arranged below the frame; The laying assembly comprises an L-shaped bracket (1), a drip irrigation tape reel mounting assembly, a drip irrigation tape reel (2), a guide tube (3), and a guide assembly, wherein one end of the guide tube (3) is connected to the guide assembly, and the other end of the guide tube (3) is rotatably connected to the L-shaped bracket (1); an end of the L-shaped bracket (1) away from the guide tube (3) is arranged above the frame, and the drip irrigation tape reel (2) is arranged above the L-shaped bracket (1) through the drip irrigation tape reel mounting assembly.

2. The adjustable drip irrigation tape laying device according to claim 1, characterized in that: The frame comprises a first crossbar (4) and a second crossbar (5), the first crossbar (4) and the second crossbar (5) are arranged in parallel, and a plurality of evenly distributed support bars (6) are arranged between the first crossbar (4) and the second crossbar (5); The second cross bar (5) is provided with a first connecting rod (7) connected to the power device.

3. The adjustable drip irrigation tape laying device according to claim 1, characterized in that: A first connecting plate (8) is provided at the end of the L-shaped bracket (1), a U-shaped bolt (9) is provided on the first connecting plate (8), and one end of the L-shaped bracket (1) is arranged on the first crossbar (4) via the U-shaped bolt (9).

4. The adjustable drip irrigation tape laying device according to claim 1, characterized in that: The drip irrigation tape reel erection assembly comprises a vertical pole (10) and a U-shaped bracket (11), wherein the bottom of the vertical pole (10) is arranged on the top of the L-shaped bracket (1), and the U-shaped bracket (11) is arranged on the top of the vertical pole (10); The two ends of the drip irrigation tape reel (2) are rotatably arranged inside the U-shaped bracket (11).

5. The adjustable drip irrigation tape laying device according to claim 1, characterized in that: One end of the guide tube (3) is rotatably connected to the L-shaped bracket (1) via a first mounting plate (12) at one end of the L-shaped bracket (1); An adjustment plate (13) is provided on both sides of the guide tube (3), and a plurality of evenly distributed through holes are provided on the adjustment plate (13); A tension spring (14) is provided between the guide tube (3) and the L-shaped bracket (1), one end of the tension spring (14) is fixedly arranged on one side of the L-shaped bracket (1), and the other end of the tension spring (14) is adjustably arranged on the adjustment plate (13) through a through hole; The inner diameter of the guide tube (3) is greater than the diameter of the drip irrigation tape (15).

6. The adjustable drip irrigation tape laying device according to claim 1, characterized in that: The guide assembly comprises a box body (16), a driving wheel (17), and a driven wheel (18); a top of one side of the box body (16) is connected to an end of the guide tube (3) away from the L-shaped bracket (1), and the interior of the box body (16) is communicated with the interior of the guide tube (3); The two ends of the driving wheel (17) and the driven wheel (18) are rotatably arranged on the side wall of the box body (16), and the drip irrigation belt (15) can pass between the driving wheel (17) and the driven wheel (18). The driving wheel (17) is arranged on a side away from the guide tube (3), and the bottom of the driving wheel (17) extends to the bottom of the box body (16) and contacts the ground.

7. The adjustable drip irrigation tape laying device according to claim 6, characterized in that: The driving wheel (17) is provided with anti-skid patterns.

8. The adjustable drip irrigation tape laying device according to claim 1, characterized in that: The soil covering assembly comprises a second connecting plate (19), a horizontal plate (20), and two soil covering plates (21); one end of the second connecting plate (19) is arranged on a side of the box body (16) away from the guide tube (3); the other end of the second connecting plate (19) is arranged in the middle of the horizontal plate (20); and the two soil covering plates (21) are arranged obliquely at both ends of the horizontal plate (20).

9. The adjustable drip irrigation tape laying device according to claim 1, characterized in that: The furrowing assembly comprises a second connecting rod (22), a furrowing plow frame (23), and a furrowing plow (24); one end of the second connecting rod (22) is arranged on one side of the L-shaped bracket (1); a mounting hole is provided on the second connecting rod (22); the furrowing plow frame (23) is arranged on the second connecting rod (22) through the mounting hole; and the furrowing plow (24) is arranged at the bottom of the furrowing plow frame (23); A plurality of evenly distributed first threaded holes (25) are provided on the furrowing plow frame (23), and a second threaded hole corresponding to the first threaded hole (25) is provided on the second connecting rod (22).

10. The adjustable drip irrigation tape laying device according to claim 1, characterized in that: The walking assembly is arranged below the second crossbar (5), and comprises a second mounting plate (26) and a walking wheel (27). The second mounting plate (26) is arranged below the second crossbar (5), and the walking wheel (27) is rotatably arranged below the second crossbar (5) through the second mounting plate (26).

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