Opposite-row intertillage weeding machine suitable for hardened seedbed

Abstract

The row-controlled intertillage weeding machine comprises a row-controlled sliding block (1), a suspension frame (3), a folding machine frame (5) and an intertillage weeding single body (6), the folding machine frame (5) is fixed on the row-controlled sliding block (1), the intertillage weeding single body (6) is connected to the folding machine frame (5), a group of row-controlled sliding rails (2) are respectively arranged on the upper portion and the lower portion of the suspension frame (3), and the row-controlled sliding rails (2) are arranged on the suspension frame (3). The opposite sliding block (1) can be connected to the opposite sliding rail (2) in a sleeving mode and can move left and right on the opposite sliding rail (2), an opposite oil cylinder (4) is arranged between the opposite sliding block (1) and the suspension frame (3), and transverse movement of the opposite sliding block (1) relative to the suspension frame (3) can be achieved by controlling the telescopic action of the opposite oil cylinder (4).

Description

Technical Field

[0001] This utility model belongs to the field of agricultural machinery, specifically relating to a row-to-row weeding machine suitable for compacted seedbeds. Background Technology

[0002] In the arid northwest region, long-term excessive fertilization and pesticide application have led to a continuous decline in soil fertility, resulting in a large proportion of low- and medium-yield fields. Especially when suppressing weed growth, pesticides need to be applied directly into the soil, causing serious soil pollution and exacerbating soil degradation and compaction. To strengthen the development of sustainable green agriculture, reduce pesticide use, and protect the soil environment, this application proposes a weeding and cultivating machine. This machine can use its weeding and cultivating components to remove weeds between crop rows and plants. Simultaneously, the position of the weeding components can be adjusted to avoid damaging seedlings, improving weed removal efficiency and soil aeration during the seedling stage, and breaking up soil compaction. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a row-to-row tillage and weeding machine suitable for compacted seedbeds that can easily adjust the row spacing.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A row-to-row weeding machine suitable for compacted seedbeds is characterized by comprising a row-to-row slider (1), a suspension frame (3), a folding frame (5), and a weeding unit (6). The folding frame (5) is fixed on the row-to-row slider (1), and the weeding unit (6) is connected to the folding frame (5). A set of row-to-row slide rails (2) are provided on the upper and lower sides of the suspension frame (3). The row-to-row slider (1) can be sleeved on the row-to-row slide rails (2), and the row-to-row slider (1) can move left and right on the row-to-row slide rails (2). A row-to-row hydraulic cylinder (4) is provided between the row-to-row slider (1) and the suspension frame (3). By controlling the extension and retraction of the row-to-row hydraulic cylinder (4), the row-to-row slider (1) can move laterally relative to the suspension frame (3).

[0006] The folding frame (5) includes a central main beam (8), a folding sub-beam (10), a folding main beam (9), a folding cylinder (11), and a cylinder seat (12). The folding frame (5) is symmetrical about the center of the suspension point and is divided into left folding and right folding. The cylinder seat (12) is installed at the center of the central main beam (8) and welded to the central main beam (8). Two cylinder mounting holes are symmetrically arranged on the left and right sides above the cylinder seat (12). Two hinge plates are symmetrically welded on the central main beam (8), and hinge holes are provided on the hinge plates. The beam (10) is concave. The folding sub-beam (10) is provided with cylinder mounting holes and main beam hinge holes. The sub-beam can rotate around the hinge plate by extending and retracting the folding cylinder (11). The main beam (8) is provided with main beam locking plates (13) at both ends. The upper middle part of the main beam locking plate (13) has a groove. The sub-beam locking plate is provided in the middle of the sub-beam. The thickness of the sub-beam locking plate is slightly narrower than the groove of the main beam locking plate (13). In the extended state, the sub-beam locking plate is embedded in the main beam locking plate (13), so that the main beam and the sub-beam are locked together by the locking plates of the cylinder in the working state.

[0007] The single unit (6) for weeding and cultivating includes a contour base (6-1), an upper connecting rod (6-2), a lower connecting rod (6-3), a contour spring (6-4), a contour wheel (6-8), a contour wheel height adjustment plate (6-5), a contour unit beam (6-6), a weeding and cultivating shovel (6-7), and a weeding mechanism (6-9).

[0008] The contouring base (6-1), upper connecting rod (6-2), lower connecting rod (6-3), and contouring wheel height adjustment plate (6-5) form a four-bar linkage mechanism. The contouring base (6-1) is fixedly connected to the folding frame (5), the contouring single beam (6-6) is fixedly connected to the contouring wheel height adjustment plate (6-6), and the weeding shovel (6-7) and weeding mechanism (6-9) are connected to the contouring single beam (6-6).

[0009] The weeding mechanism (6-9) is a passive rotating type. When the machine moves forward, the weeder is passively rotated due to soil resistance. The weeding mechanism (6-9) mainly includes a mounting base (6-16), a lateral adjustment base (6-17), a height adjustment base (6-12), a longitudinal beam (6-11), a pivot base (6-13), a weeding finger disc (6-14), and a soil-entry toothed disc (6-15). The mounting base (6-16) is fixedly mounted on the contoured single beam (6-6). The lateral adjustment base (6-17) can be adjusted in lateral position relative to the mounting base (6-16). The longitudinal beam (6-11) can be adjusted in height relative to the height adjustment base (6-12). The bottom of the longitudinal beam (6-11) is fixedly connected to the pivot base (6-13). A pivot is installed in the pivot base (6-13), and the pivot can rotate flexibly relative to the pivot base (6-13). The rotating shaft is integrally connected to the soil-inserting toothed disc (6-15), and the weeding finger disc (6-14) is fixedly connected to the soil-inserting toothed disc (6-15).

[0010] The outer circumference of the soil-inserting toothed disc (6-15) is provided with multiple sets of soil-inserting teeth, which are bent at a certain angle 'a' with the soil-inserting toothed disc (6-15). During installation, the soil-inserting teeth form an angle 'b' with the vertical direction, where the installation range of angle 'b' is generally between -5 degrees and +5 degrees, and the bending angle of the soil-inserting teeth is generally between 110 degrees and 140 degrees. The outer circumference of the weeding finger disc (6-14) is provided with multiple sets of weeding fingers, and the weeding finger disc (6-14) and the soil-inserting toothed disc (6-15) are installed in an alternating manner; the weeding finger disc (6-14) is made of flexible material.

[0011] The contour base (6-1) is T-shaped, with two sets of threaded holes symmetrically arranged on the front protrusion and two sets of hinge holes on the right end. One set of hinge holes connects the upper connecting rod (6-2) and the lower connecting rod (6-3), and the other set of hinge holes connects the folding frame (5). During installation, the front end of the contour base (6-1) is aligned with the folding frame (5). The main beam clamp is L-shaped, with one end hinged to the contour base (6-1) and two sets of bolt holes in the middle. The main beam clamp is clamped onto the folding frame (5) by the installation bolts. Due to the variety of planting patterns and the large number of crop row spacings, the installation distance between the weeding and cultivating units (6) needs to be adjusted according to the planting pattern in real time to adapt to different row spacings. This clamping method is conducive to clamping and quick adjustment of lateral position.

[0012] The front ends of the upper and lower connecting rods are hinged to the contouring seat (6-1), and the rear ends are hinged to the contouring wheel height adjustment plate (6-5). A contouring spring (6-4) is installed between the upper and lower connecting rods. The upper connecting rod (6-2) has multiple sets of contouring spring (6-4) mounting holes arranged sequentially from front to back. The contouring preload can be adjusted by adjusting the installation position of the contouring spring (6-4) according to the hardness of the ground. The upper connecting rod (6-2) is fishbone shaped. Since the preload of the contouring spring (6-4) increases towards the rear, this shape is designed to protect the strength of the upper connecting rod (6-2). The contouring wheel height adjustment plate (6-5) is connected to the contouring wheel (6-8) by a threaded connection, which facilitates the adjustment of the depth limit height of the contouring wheel (6-8).

[0013] The contour wheel height adjustment plate (6-5) is fixedly connected to the contour single beam (6-6) at the rear end. The contour single beam (6-6) is divided into left and right groups. The contour single beam (6-6) has multiple sets of weeding shovel mounting holes from front to back for installing the weeding shovel (6-7) and the weeding mechanism (6-9). The installation distance between the front and rear shovels can be adjusted according to the actual use.

[0014] As an improvement, ground wheels (7) are installed at the bottom of both sides of the suspension frame (3). When working, the ground wheels (7) are in contact with the ground, ensuring that the overall structure does not produce large vibrations and swaying during the movement of the row slider (1), thereby improving the stability and accuracy of the lateral movement. The lateral and height positions of the ground wheels (7) connected to the suspension frame (3) are adjustable. The height of the ground wheels (7) can be adjusted according to the growth of the crop seedlings to ensure that the ground wheels (7) are always in contact with the ground, thus ensuring the stability of the mechanism. The lateral installation position can also be adjusted according to the row spacing of the crops to ensure that the ground wheels (7) move between the rows during operation and avoid crushing the seedlings.

[0015] As an improvement, when the width of the machine is large, the weight and load of the whole machine are large, and the strength of the round tube slide rail is weak. Therefore, the slide rail of the large width adopts the form of I-beam (20). At this time, the slide is composed of upper slide roller (17), lower slide roller (18), side slide roller (19) and slide roller seat plate (16). Through the rotation of the upper and lower slide rollers (18), the slide can move flexibly left and right on the I-beam (20) to realize the horizontal adjustment operation. Since the horizontal direction will generate a large resistance during operation, a set of side slide rollers (19) is set on the slide to balance the working resistance and prevent the slide from deforming up and down and making the horizontal movement unsmooth.

[0016] Compared with existing technologies, this utility model has the advantages of conveniently removing weeds between crop rows and plants, avoiding damage to seedlings, improving weed removal rate, improving soil aeration during the seedling stage, and breaking up soil compaction during the seedling stage. Attached Figure Description

[0017] Figure 1This is a three-dimensional structural diagram of the present invention.

[0018] Figure 2 This is a schematic diagram of the folding structure of the main beam of this utility model.

[0019] Figure 3 This is a schematic diagram of the main structure of this utility model (I).

[0020] Figure 4 This is a schematic diagram of the main structure of this utility model (II).

[0021] Figure 5 This is a schematic diagram of the single-unit structure for weeding and tillage in this utility model.

[0022] Figure 6 This is a schematic diagram of the weeding mechanism of this utility model.

[0023] Figure 7 This is a schematic diagram of the horizontal movement mechanism of this utility model.

[0024] Figure 8 This is a schematic diagram of the weeding mechanism of this utility model (I).

[0025] Figure 9 This is a schematic diagram of the weeding mechanism of this utility model (II).

[0026] The diagram shows: 1 is the parallel slider, 2 is the parallel slide rail, 3 is the suspension frame, 4 is the parallel hydraulic cylinder, 5 is the folding frame, 6 is the single unit for weeding and cultivating, 6-1 is the contouring seat, 6-2 is the upper connecting rod, 6-3 is the lower connecting rod, 6-4 is the contouring spring, 6-5 is the contouring wheel height adjustment plate, 6-6 is the contouring single unit beam, 6-7 is the weeding shovel, 6-8 is the contouring wheel, 6-9 is the weeding mechanism, 6-10 is the main beam clamping plate, 6-11 is the longitudinal beam, and 6-12 is the height... The following are the components of the structure: 6-13 is the pivot seat, 6-14 is the weeding finger disc, 6-15 is the soil-entry toothed disc, 6-16 is the mounting seat, 6-17 is the lateral adjustment seat, 7 is the ground wheel, 8 is the middle main beam, 9 is the folding main beam, 10 is the folding secondary beam, 11 is the folding hydraulic cylinder, 12 is the hydraulic cylinder seat, 13 is the main beam locking plate, 14 is the hinge plate, 15 is the secondary beam locking plate, 16 is the sliding roller seat plate, 17 is the upper sliding roller, 18 is the lower sliding roller, 19 is the side sliding roller, and 20 is the I-beam. Detailed Implementation

[0027] The following embodiments further illustrate the above-described content of the present invention in detail. Obviously, the described embodiments are merely a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0028] Example 1: Refer to Figure 1-9 The above is a schematic diagram of the structure of Embodiment 1 of this utility model. This embodiment discloses a row-to-row weeding machine suitable for compacted seedbeds, including: row slider (1), suspension frame (3), folding frame (5), and weeding unit (6). The suspension frame (3) is a three-point suspension for attaching to a tractor.

[0029] A set of parallel slide rails (2) is provided on the upper and lower sides of the suspension frame (3). The parallel slide rails (2) are cylindrical, and parallel sliders (1) are connected to the parallel slide rails. The parallel sliders (1) and the parallel slide rails (2) are connected by a lateral sliding connection, which is in the form of a large tube inside a small tube, and are respectively connected to the parallel slide rails (2). The parallel sliders (1) can move left and right on the parallel slide rails (2). At the same time, a parallel cylinder (4) is provided between the parallel sliders (1) and the suspension frame (3). By controlling the extension and retraction of the parallel cylinders (4), the parallel sliders (1) can move laterally relative to the suspension frame (3).

[0030] Ground wheels (7) are installed at the bottom of both sides of the suspension frame (3). When working, the ground wheels (7) are in contact with the ground to ensure that the overall structure does not generate large vibrations and swaying during the movement of the row slider (1), thereby improving the stability and accuracy of the lateral movement. The lateral position and height position of the ground wheel (7) connected to the suspension frame (3) are adjustable. The height of the ground wheel (7) can be adjusted according to the growth of the crop seedlings to ensure that the ground wheel (7) is always in contact with the ground and to ensure the stability of the mechanism. The lateral installation position can also be adjusted according to the row spacing of the crops to ensure that the ground wheel (7) moves between the rows during operation and to avoid the ground wheel (7) pressing on the seedlings.

[0031] In addition, when the width of the machine is large, the weight and load of the whole machine are large, and the strength of the round tube slide rail is weak. Therefore, the slide rail of the large width adopts the form of I-beam (20). At this time, the slide is composed of upper slide roller (17), lower slide roller (18), side slide roller (19) and slide roller seat plate (16). Through the rotation of the upper and lower slide rollers (18), the slide can move flexibly left and right on the I-beam (20) to realize the horizontal adjustment operation. Since the horizontal direction will generate a large resistance during operation, a set of side slide rollers (19) is set on the slide to balance the working resistance and prevent the slide from deforming up and down and making the horizontal movement unsmooth.

[0032] The folding frame (5) is fixed on the row slider (1), and the weeding unit (6) is connected to the folding frame (5). That is, the folding frame (5) is fixedly installed on the row slider (1), and the folding frame (5) can move laterally together with the row slider (1).

[0033] The folding frame (5) mainly includes a central main beam (8), a folding sub-beam (10), a folding main beam (9), a folding cylinder (11), and a cylinder seat (12). The folding frame (5) is symmetrical about the center of the suspension point and is divided into left folding and right folding. The cylinder seat (12) is installed at the center of the central main beam (8) and is welded to the central main beam (8). Two cylinder mounting holes are symmetrically arranged on the left and right sides above the cylinder seat (12). Two hinge plates are symmetrically welded on the central main beam (8), and hinge holes are provided on the hinge plates. The folding sub-beam (10) is concave. Cylinder mounting holes and main beam hinge holes are provided on the folding sub-beam (10). The sub-beam can rotate around the hinge plates by extending and retracting the folding cylinder (11). The main beam (8) is provided with main beam locking plates (13) at both ends. The upper middle part of the main beam locking plate (13) has a groove. The secondary beam locking plate is provided in the middle of the secondary beam. The thickness of the secondary beam locking plate is slightly narrower than the groove of the main beam locking plate (13). In the extended state, the secondary beam locking plate is embedded in the main beam locking plate (13), so that the main beam and the secondary beam are locked together by the locking plate of the oil cylinder in the working state, which solves the problem of the secondary beam being too long and unstable in the working state.

[0034] The tillage and weeding unit (6) mainly consists of a contour base (6-1), an upper connecting rod (6-2), a lower connecting rod (6-3), a contour spring (6-4), a contour wheel (6-8), a contour wheel height adjustment plate (6-5), a contour unit beam (6-6), a tillage and weeding shovel (6-7), and a weeding mechanism (6-9).

[0035] The contouring base (6-1), upper connecting rod (6-2), lower connecting rod (6-3), and contouring wheel height adjustment plate (6-5) form a four-bar linkage mechanism.

[0036] The contouring base (6-1) is fixedly connected to the folding frame (5), the contouring single beam (6-6) is fixedly connected to the contouring wheel height adjustment plate (6-6), and the weeding shovel (6-7) and weeding mechanism (6-9) are connected to the contouring single beam (6-6).

[0037] The contour base (6-1) is T-shaped, with two sets of threaded holes symmetrically arranged on the front protrusion and two sets of hinge holes on the right end. One set of hinge holes connects the upper connecting rod (6-2) and the lower connecting rod (6-3), and the other set of hinge holes connects the folding frame (5). During installation, the front end of the contour base (6-1) is aligned with the folding frame (5). The main beam clamp is L-shaped, with one end hinged to the contour base (6-1) and two sets of bolt holes in the middle. The main beam clamp is clamped onto the folding frame (5) by the installation bolts. Due to the variety of planting patterns and the large number of crop row spacings, the installation distance between the weeding and cultivating units (6) needs to be adjusted according to the planting pattern in real time to adapt to different row spacings. This clamping method is conducive to clamping and quick adjustment of lateral position.

[0038] The front ends of the upper and lower connecting rods are hinged to the contouring seat (6-1), and the rear ends are hinged to the contouring wheel height adjustment plate (6-5). A contouring spring (6-4) is installed between the upper and lower connecting rods. The upper connecting rod (6-2) has multiple sets of contouring spring (6-4) mounting holes arranged sequentially from front to back. The contouring preload can be adjusted by adjusting the installation position of the contouring spring (6-4) according to the hardness of the ground. The upper connecting rod (6-2) is fishbone shaped. Since the preload of the contouring spring (6-4) increases towards the rear, this shape is designed to protect the strength of the upper connecting rod (6-2). The contouring wheel height adjustment plate (6-5) is connected to the contouring wheel (6-8) by a threaded connection, which facilitates the adjustment of the depth limit height of the contouring wheel (6-8).

[0039] The contour wheel height adjustment plate (6-5) is fixedly connected to the contour single beam (6-6) at the rear end. The contour single beam (6-6) is divided into left and right groups. The contour single beam (6-6) has multiple sets of weeding shovel mounting holes from front to back for installing the weeding shovel (6-7) and the weeding mechanism (6-9). The installation distance between the front and rear shovels can be adjusted according to the actual use.

[0040] The weeding mechanism (6-9) is a passive rotating type. When the machine moves forward, the weeder is passively rotated due to soil resistance. The weeding mechanism (6-9) mainly includes a mounting base (6-16), a lateral adjustment base (6-17), a height adjustment base (6-12), a longitudinal beam (6-11), a pivot base (6-13), a weeding finger disc (6-14), and a soil-entry toothed disc (6-15). The mounting base (6-16) is fixedly mounted on the contoured single beam (6-6). The lateral adjustment base (6-17) can be adjusted in lateral position relative to the mounting base (6-16). The longitudinal beam (6-11) can be adjusted in height relative to the height adjustment base (6-12). The bottom of the longitudinal beam (6-11) is fixedly connected to the pivot base (6-13). A pivot is installed in the pivot base (6-13), and the pivot can rotate flexibly relative to the pivot base (6-13). The rotating shaft is integrally connected to the soil-inserting toothed disc (6-15), and the weeding finger disc (6-14) is fixedly connected to the soil-inserting toothed disc (6-15).

[0041] The outer circumference of the soil-inserting toothed disc (6-15) is provided with multiple sets of soil-inserting teeth, which are bent at a certain angle 'a' with the soil-inserting toothed disc (6-15). During installation, the soil-inserting teeth form an angle 'b' with the vertical direction, where the installation range of angle 'b' is generally between -5 degrees and +5 degrees, and the bending angle of the soil-inserting teeth is generally between 110 degrees and 140 degrees. The outer circumference of the weeding finger disc (6-14) is provided with multiple sets of weeding fingers, and the weeding finger disc (6-14) and the soil-inserting toothed disc (6-15) are installed in an alternating manner.

[0042] The weeding finger disc (6-14) is made of flexible material to prevent the weeding fingers from accidentally cutting and damaging the seedlings when they accidentally touch the crop plants. The weeding finger spacing angle on the weeding finger disc (6-14) is c, the radius from the outer end of the weeding finger to the center is R2, and the width of the weeding finger is B. Therefore, the arc length between two adjacent weeding fingers is c*R2. The arc length is set to match the planting column spacing. It is recommended to set two sets of weeding fingers between large plant spacings and one set of weeding fingers between small plant spacings. When installing the weeding fingers, they correspond to the soil entry teeth of the soil entry tooth disc (6-15). The installation angle between the soil entry teeth and the weeding fingers is d. When the soil is hard, the installation angle d is selected as 0. The soil entry teeth and the weeding fingers coincide in the circumferential direction. Because the weeding fingers are flexible, in this case, the soil entry teeth can better drive the weeding fingers into the soil to weed, preventing the flexible weeding fingers from not entering the soil when the ground is hard. When the soil is soft, the installation angle d can be flexibly adjusted.

Claims

1. A row-to-row weeding machine suitable for compacted seedbeds, characterized in that: The system includes a row slider (1), a suspension frame (3), a folding frame (5), and a weeding unit (6). The folding frame (5) is fixed on the row slider (1), and the weeding unit (6) is connected to the folding frame (5). The suspension frame (3) is provided with a set of row slide rails (2) on the upper and lower sides. The row slider (1) can be sleeved on the row slide rails (2), and the row slider (1) can move left and right on the row slide rails (2). A row cylinder (4) is provided between the row slider (1) and the suspension frame (3). By controlling the extension and retraction of the row cylinder (4), the row slider (1) can move laterally relative to the suspension frame (3). The single unit (6) for weeding and cultivating includes a contour base (6-1), an upper connecting rod (6-2), a lower connecting rod (6-3), a contour spring (6-4), a contour wheel (6-8), a contour wheel height adjustment plate (6-5), a contour unit beam (6-6), a weeding and cultivating shovel (6-7), and a weeding mechanism (6-9). The contouring base (6-1), upper connecting rod (6-2), lower connecting rod (6-3), and contouring wheel height adjustment plate (6-5) form a four-bar linkage mechanism. The contouring base (6-1) is fixedly connected to the folding frame (5), the contouring single beam (6-6) is fixedly connected to the contouring wheel height adjustment plate (6-5), and the weeding shovel (6-7) and weeding mechanism (6-9) are connected to the contouring single beam (6-6).

2. The row-to-row weeding machine for compacted seedbeds as described in claim 1, characterized in that: The weeding mechanism (6-9) is a passive rotary type. When the machine moves forward, the weeder is passively rotated due to soil resistance. The weeding mechanism (6-9) mainly includes a mounting base (6-16), a lateral adjustment base (6-17), a height adjustment base (6-12), a longitudinal beam (6-11), a pivot seat (6-13), a weeding finger disc (6-14), and a soil-entry toothed disc (6-15). The mounting base (6-16) is fixedly installed on the contoured single beam (6-6), and the lateral adjustment base... (6-17) can be adjusted in the lateral installation position relative to the mounting base (6-16). The longitudinal beam (6-11) can be adjusted in installation height relative to the height adjustment base (6-12). The bottom of the longitudinal beam (6-11) is fixedly connected to the pivot seat (6-13). A pivot is installed in the pivot seat (6-13). The pivot can rotate flexibly relative to the pivot seat (6-13). The pivot is integrally connected to the soil-entry toothed disc (6-15). The weeding finger disc (6-14) is fixedly connected to the soil-entry toothed disc (6-15).

3. The row-to-row weeding machine for compacted seedbeds as described in claim 2, characterized in that: The outer circumference of the soil-inserting toothed disc (6-15) is provided with multiple sets of soil-inserting teeth, which are bent at a certain angle 'a' with the soil-inserting toothed disc (6-15). During installation, the soil-inserting teeth form an angle 'b' with the vertical direction. The installation range of the angle 'b' is generally between -5 degrees and +5 degrees, and the bending angle of the soil-inserting teeth is generally between 110 degrees and 140 degrees. The outer circumference of the weeding finger disc (6-14) is provided with multiple sets of weeding fingers. The weeding finger disc (6-14) and the soil-inserting toothed disc (6-15) are installed in an alternating manner. The weeding finger disc (6-14) is made of flexible material.

4. The row-to-row weeding machine for compacted seedbeds as described in claim 1, characterized in that: The folding frame (5) includes a central main beam (8), a folding sub-beam (10), a folding main beam (9), a folding cylinder (11), and a cylinder seat (12). The folding frame (5) is symmetrical about the center of the suspension point and is divided into left folding and right folding. The cylinder seat (12) is installed at the center of the central main beam (8) and welded to the central main beam (8). Two cylinder mounting holes are symmetrically arranged on the left and right sides above the cylinder seat (12). Two hinge plates are symmetrically welded on the central main beam (8), and hinge holes are provided on the hinge plates. The beam (10) is concave. The folding sub-beam (10) is provided with cylinder mounting holes and main beam hinge holes. The sub-beam can rotate around the hinge plate by extending and retracting the folding cylinder (11). The main beam (8) is provided with main beam locking plates (13) at both ends. The upper middle part of the main beam locking plate (13) has a groove. The sub-beam locking plate is provided in the middle of the sub-beam. The thickness of the sub-beam locking plate is slightly narrower than the groove of the main beam locking plate (13). In the extended state, the sub-beam locking plate is embedded in the main beam locking plate (13), so that the main beam and the sub-beam are locked together by the locking plates of the cylinder in the working state.

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