Agricultural sitting and lying dual-purpose light working trolley

Abstract

This invention discloses a lightweight, portable agricultural work trolley that can be used in both sitting and reclining positions. It includes a three-section folding panel assembly, an aluminum profile frame, a multi-angle adjustable headrest support assembly, an adaptive gravity-compensated suspended handrest assembly, and a power module. The adaptive gravity-compensated suspended handrest assembly is symmetrically mounted above the drive housing at the front of the trolley. The three-section folding panel assembly includes a backrest, a seat, a chest plate, and seat support legs. The backrest and one end of the seat, and the other end of the seat and the chest plate, are hinged together via hinges. The multi-angle adjustable headrest support assembly is connected to the chest plate. The aluminum profile frame has longitudinal guide rails and a sliding assembly. The bottom of the seat is connected to the sliding assembly, which is positioned within the longitudinal guide rails to allow the three-section folding panel assembly to move along the longitudinal guide rails. The power module is located on the aluminum profile frame. This invention can adapt to crops and working environments of different heights, enabling flexible switching between sitting and reclining positions.

Description

Technical Field

[0001] This invention relates to the field of agricultural machinery technology, and in particular to a lightweight, portable agricultural work vehicle that can be used for both sitting and lying down. Background Technology

[0002] Existing agricultural trolleys, used as auxiliary tools, are typically simple in structure and mostly designed to support only a single sitting or lying posture. However, actual farmland operations face complex working conditions. First, the crops vary in height (e.g., low-lying leafy vegetables to taller solanaceous crops), and the spatial environment is highly variable. A single sitting or lying posture is insufficient for all scenarios: a sitting posture makes it difficult to reach low-lying crops, while a consistently fixed lying posture limits visibility and operational flexibility. This mismatch between posture and working conditions affects the accuracy and effectiveness of the operations.

[0003] Therefore, there is an urgent need to develop a work device that can support flexible switching between sitting and lying positions in order to solve the above-mentioned technical problems. Summary of the Invention

[0004] This invention provides a lightweight agricultural work trolley that can be used in both sitting and reclining positions. By combining an adjustable frame with a foldable seat mechanism, it solves the limitation of existing work trolleys that are difficult to adapt to changing agricultural working conditions due to their single posture.

[0005] This invention provides a lightweight, recumbent agricultural work trolley, comprising a three-section folding panel assembly, an aluminum profile frame, a multi-angle adjustable headrest support assembly, two adaptive gravity-compensated suspended handrest assemblies, and a power module. The two adaptive gravity-compensated suspended handrest assemblies are symmetrically mounted on the front drive housing of the trolley. The three-section folding panel assembly includes a backrest, a seat, a chest plate, and seat support legs. The backrest is hinged to one end of the seat, and the other end of the seat is hinged to the chest plate. The multi-angle adjustable headrest support assembly is located at the bottom of the chest plate. The aluminum profile frame is provided with a longitudinal guide rail and a sliding assembly. The bottom of the seat is connected to the sliding assembly, which is located within the longitudinal guide rail to allow the three-section folding panel assembly to move along the longitudinal guide rail. The power module is located on the aluminum profile frame.

[0006] Preferably, in the aforementioned lightweight agricultural work trolley that can be used for sitting or lying down, the sliding assembly includes a seat support leg and a slider, the slider being disposed within the longitudinal guide rail, and the slider being fixedly provided at the bottom of the seat support leg.

[0007] Preferably, in the aforementioned lightweight agricultural trolley that can be used for sitting or lying down, the longitudinal guide rail includes a base and a cylindrical guide rail shaft. The base is mounted on the aluminum profile frame, and the cylindrical guide rail shaft is provided on the base. The slider includes a body, a bearing mounting cavity, a locking screw, and fastening screw holes. The bearing mounting cavity is located inside the body, and a linear ball bearing is embedded in the bearing mounting cavity. The linear ball bearing is sleeved on the outside of the cylindrical guide shaft. A radial threaded through hole is provided on the side wall of the body, penetrating the side wall and communicating with the bearing mounting cavity. The locking screw is screwed into the radial threaded through hole. When locked, the locking screw rotates radially and presses against the linear ball bearing in the bearing mounting cavity, causing the linear ball bearing to generate a radial tightening effect and hold the cylindrical guide shaft, thereby increasing the static friction between the linear ball bearing and the cylindrical guide shaft, restricting the axial displacement of the slider along the cylindrical guide shaft, and realizing the position locking of the slider. The top surface of the body has a plurality of fastening screw holes arranged in a matrix, and the bottom of the seat support leg has a through hole. The fastening screw holes are used to connect and fix with the through holes by screws.

[0008] Preferably, in the aforementioned lightweight agricultural work trolley that can be used for both sitting and lying down, the multi-angle adjustable headrest support assembly includes a U-shaped headrest, a headrest support rod, a quick-release structure, and two headrest connecting rods. The U-shaped headrest is bolted between the two headrest connecting rods. The two headrest connecting rods are detachably mounted on one side of the quick-release structure. The quick-release structure can apply an axial clamping force to the headrest connecting rods to adjust their position. The other side of the quick-release structure has the headrest support rod. A guide is provided on the breast plate, and a connecting plate and a guide tube are provided on the guide. The connecting plate is fixed to the bottom of the breast plate with bolts. The guide tube has a threaded connection hole, and a locking bolt is provided in the threaded connection hole. The headrest support rod passes through the guide tube, and the position of the headrest support rod is fixed by tightening the locking bolt passing through the threaded connection hole. The extension length of the headrest support rod is adjusted by loosening the locking bolt.

[0009] Preferably, the quick-release structure of the aforementioned lightweight agricultural trolley (suitable for both sitting and reclining) includes an operating handle, a pressure washer, a central pull rod, and an adjusting nut. The central pull rod is cylindrical with a long axis. A first flat washer is fixedly provided at the first end of the central pull rod, and a second flat washer is fixedly provided at the second end of the central pull rod. The first end of the central pull rod has a circular ring connector, and the outer wall of the second end of the central pull rod has an external thread section. An eccentric cam is integrally formed at the root of the operating handle. The eccentric cam is pivotally connected to the circular ring connector via a transversely passing pin. The pressure washer is connected to the upper... The first flat washers are coaxial in sequence, and the pressure washer is slidably sleeved on the central pull rod. The upper end face of the pressure washer directly abuts against the outer contour of the eccentric cam, forming a frictional force transmission fit of the cam follower surface. The pressure washer and the upper end face of the first flat washer form a first clamping working surface. The adjusting nut has an internal thread that matches the tail of the central pull rod and is screwed onto the second end of the central pull rod through the thread pair. The second flat washer and the adjusting nut form a second clamping working surface. The bottoms of the two headrest connecting rods are respectively located at the first clamping working surface and the second clamping working surface.

[0010] Preferably, the bottom of both headrest connecting rods of the aforementioned agricultural sitting and lying portable work trolley is provided with a U-shaped opening, the U-shaped opening is sleeved on the central tie rod, and is respectively located at the first clamping working surface and the second clamping working surface.

[0011] Preferably, the adaptive gravity-compensated suspended hand support assembly of the aforementioned agricultural dual-use (sitting and reclining) lightweight work vehicle includes a fixed base, a linkage mechanism, a triangular coupling plate, a damping spring, and an end U-shaped rotating bracket. The linkage mechanism is a long rod. The fixed base is rigidly fixed to the surface of the front drive box of the vehicle body by bolts. The first vertex of the triangular coupling plate is hinged to the bracket of the fixed base by a pin. The damping spring acts on the second vertex of the triangular coupling plate, and a dynamic force balance system is constructed by the obliquely placed damping spring. The third vertex of the triangular coupling plate is hinged to one end of the linkage mechanism by a pin, and the other end of the linkage mechanism is connected to the end U-shaped rotating bracket.

[0012] The beneficial effects are: 1) This invention provides a lightweight, portable agricultural work trolley that can be used for both sitting and lying down. Through the combination of a longitudinal guide rail assembly and a three-section folding plate assembly, it can not only adjust the seat position according to the workers of different heights, but also adapt to crops and working environments of different heights, realizing flexible switching between sitting and lying positions.

[0013] 2) This invention also provides an adaptive gravity-compensated multi-degree-of-freedom suspended hand support mechanism, which utilizes a parallelogram linkage mechanism in conjunction with damping springs to construct a dynamic force balance system. This mechanism can counteract the suspended weight of the operator's arm in real time, providing "zero-gravity" flexible support and effectively isolating vibrations generated by vehicle movement. This design not only significantly reduces the continuous load on the arm muscles but also significantly improves the operational stability and accuracy of precision agricultural operations (such as weeding and thinning).

[0014] 3) This invention provides a multi-angle adjustable headrest support component. This component supports flexible adjustment of the tilt angle and extension length, closely conforming to the facial curves of different users. This user-friendly support design effectively distributes pressure on the cervical spine, completely solving the problem of stiff and sore neck and shoulder muscles during prolonged prone positions. Attached Figure Description

[0015] Figure 1 This is a side view of the structure of the present invention; Figure 2 This is a top view of the structure of the present invention; Figure 3 This is a schematic diagram of the slide rail and locking slider of the present invention; Figure 4 This is a schematic diagram of the headrest of the present invention; Figure 5 This is a schematic diagram of the multi-degree-of-freedom suspended hand support mechanism of the present invention; Figure 6 This is a schematic diagram of the quick-release structure of the present invention; Figure 7 This is a structural diagram of the central tie rod; Figure 8 This is a schematic diagram of the operating handle; Figure 9 This is a structural schematic diagram of the guide component; Figure 10 This is a schematic diagram of the slider's structure; Figure 11 This is a schematic diagram of the longitudinal guide rail structure; Figure 12 This is a folded diagram of the multi-angle adjustable headrest support component.

[0016] In the picture: 1. Backrest; 2. Seat; 3. Chest support; 4. Longitudinal guide rail; 4-1. Cylindrical guide rail shaft; 4-2. Base; 5. Aluminum profile frame; 6. Slider; 6-1. Body; 6-2. Bearing mounting cavity; 6-3. Locking screw; 6-4. Fastening screw holes; 7. Seat support legs; 8. Hinges; 9. U-shaped headrest; 10. Headrest support rod; 11. Quick-release structure; 11-1 Operating handle; 11-2 Pressure washer; 11-3 First flat washer; 11-4 Center tie rod; 11-5. Second flat washer; 11-6. Adjusting nut; 11-7. Circular ring connector; 11-8. External thread section; 12. Power module; 13. Guide component; 13-1. Connecting plate; 13-2. Guide tube; 13-3. Threaded connection hole; 15. Headrest connecting rod; 16. Linkage mechanism; 17. Fixed base; 18. Triangular coupling plate; 19. Damping spring; 20. End U-shaped rotating bracket; 21. Front-end driver enclosure. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0018] In the description of this invention, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the system or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the use of terms such as "first" and "second" to define components is merely for the convenience of distinguishing the aforementioned components; unless otherwise stated, these terms have no special meaning and should not be construed as indicating or implying relative importance.

[0019] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "setting," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0020] This invention provides a lightweight, recumbent agricultural work trolley, comprising a three-section folding panel assembly, an aluminum profile frame, a multi-angle adjustable headrest support assembly, two adaptive gravity-compensated suspended handrest assemblies, and a power module. The two adaptive gravity-compensated suspended handrest assemblies are symmetrically mounted on the front drive housing of the trolley. The three-section folding panel assembly includes a backrest, a seat, a chest plate, and seat support legs. The backrest is hinged to one end of the seat, and the other end of the seat is hinged to the chest plate. The multi-angle adjustable headrest support assembly is located at the bottom of the chest plate. The aluminum profile frame has a longitudinal guide rail and a sliding assembly. The bottom of the seat is connected to the sliding assembly, which is located within the longitudinal guide rail to allow the three-section folding panel assembly to move along the longitudinal guide rail. The power module is located on the aluminum profile frame. This invention, through the cooperation of an adjustable frame and a foldable seat mechanism, overcomes the limitations of existing work trolleys that are difficult to adapt to varied agricultural working conditions due to their single posture.

[0021] The following section uses a lightweight, retractable agricultural work vehicle as an example to illustrate the entire technical process in detail.

[0022] Example 1 like Figures 1 to 11 As shown, an agricultural trolley that can be used for both sitting and reclining includes a three-section folding panel assembly, an aluminum profile frame 5, a multi-angle adjustable headrest support assembly, two adaptive gravity-compensated suspended hand rest assemblies, and a power module 12. The two adaptive gravity-compensated suspended hand rest assemblies are symmetrically mounted on the front drive housing 21 of the trolley. The three-section folding panel assembly includes a backrest 1, a seat 2, a chest plate 3, and seat support legs 7. The backrest 1 is hinged to one end of the seat 2, and the other end of the seat 2 is hinged to the chest plate 3 via hinges 8. The hinges 8 can achieve 0° and 90° self-locking functions. The multi-angle adjustable headrest support assembly is located at the bottom of the chest plate 3. The aluminum profile frame 5 is provided with a longitudinal guide rail 4 and a sliding assembly. The bottom of the seat 2 is connected to the sliding assembly, which is located within the longitudinal guide rail 4 to allow the three-section folding panel assembly to move along the longitudinal guide rail 4. The aluminum profile frame 5 is provided with a power module 12.

[0023] When the operator is seated, the backrest 1 is in an upright position, providing back support; the chest panel 3 is folded down and stored via hinge 8. When the operator is lying down, the operator uses hinge 8 to lay the backrest 1 flat and unfolds the chest panel 3 so that it is on the same horizontal plane as the seat panel 2. At this time, the backrest 1, seat panel 2, and chest panel 3 form a continuous planar platform, on which the operator can comfortably lie prone, reducing the load on the lumbar spine.

[0024] Figure 12As shown, when the chest plate 3 is folded down for storage, the two headrest support rods 10 of the multi-angle adjustable headrest support assembly are inserted into the guide 13. The U-shaped headrest 9 of the multi-angle adjustable headrest support assembly is folded. Then, the multi-angle adjustable headrest support assembly is folded down below the chest plate 3 and parallel to the chest plate 3. The length of the headrest support rod 10 is just equal to or less than the length of the chest plate 3.

[0025] like Figure 1 , Figure 2 and Figure 3 As shown, the sliding assembly includes a seat support leg 7 and a slider 6. The slider 6 is disposed in the longitudinal guide rail 4, and the bottom of the seat support leg 7 is fixedly provided with the slider 6.

[0026] like Figure 11 As shown, the longitudinal guide rail 4 includes a base 4-2 and a cylindrical guide rail shaft 4-1. The base 4-2 is mounted on the aluminum profile frame 5, and the cylindrical guide rail shaft 4-1 is mounted on the base 4-2. The slider 6 includes a body 6-1, a bearing mounting cavity 6-2, a locking screw 6-3, and a fastening screw hole 6-4. The bearing mounting cavity 6-2 is located inside the body 6-1, and a linear ball bearing 6-6 is embedded in the bearing mounting cavity 6-2. The linear ball bearing 6-6 is sleeved on the outside of the cylindrical guide rail shaft 4-1. A radial threaded through hole is provided on the side wall of the body 6-1, penetrating its side wall and communicating with the bearing mounting cavity 6-2. The locking screw 6-3 is screwed into the radial threaded through hole. When locked, the locking screw 6-3 rotates radially and presses against the linear ball bearing 6-6 located in the bearing mounting cavity 6-2, causing the linear ball bearing 6-6 to exert a radial tightening effect and grip the cylindrical guide shaft 4-1. This increases the static friction between the linear ball bearing 6-6 and the cylindrical guide shaft 4-1, restricting the axial displacement of the slider 6 along the cylindrical guide shaft 4-1 and achieving position locking of the slider. The top surface of the slider 6 body is provided with several fastening screw holes 6-4 arranged in a matrix, and the bottom of the seat support leg 7 is provided with a through hole. The fastening screw holes 6-4 are used to connect and fix the slider to the through hole with screws.

[0027] like Figure 1 , Figure 4 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 12As shown, the multi-angle adjustable headrest support assembly includes a U-shaped headrest 9, a headrest support rod 10, a quick-release structure 11, and two headrest connecting rods 15. The U-shaped headrest 9 is bolted between the two headrest connecting rods 15. The two headrest connecting rods 15 are detachably mounted on one side of the quick-release structure 11. The quick-release structure 11 can apply an axial clamping force to the headrest connecting rods 15 to achieve position adjustment. The other side of the quick-release structure 11 is provided with the headrest support rod 10. The bottom of the chest plate 3 is fixed with a guide member 13 by bolts. The guide member 13 is provided with a connecting plate 13-1 and a guide tube. 13-2, The connecting plate 13-1 is fixed to the bottom of the chest plate 3 by bolts. The guide tube 13-2 is provided with a threaded connection hole 13-3. A locking bolt is provided in the threaded connection hole 13-3. The headrest support rod 10 passes through the guide tube 13-2. The headrest support rod 10 is fixed by tightening the locking bolt passing through the threaded connection hole 13-3. The extension length of the headrest support rod 10 is adjusted by loosening the locking bolt. The U-shaped headrest 9 is close to the chest plate 3, and the headrest support rod 10 is close to the seat plate 2. The headrest support rod 10 is provided with threads.

[0028] like Figure 6 and Figure 7 As shown, the quick-release structure 11 includes an operating handle 11-1, a pressure washer 11-2, a central pull rod 11-4, and an adjusting nut 11-6. The central pull rod 11-4 is a cylindrical shape with a long axis. A first flat washer 11-3 is fixedly provided at the first end near the central pull rod 11-4, and a second flat washer 11-5 is fixedly provided at the second end near the central pull rod 11-4. A circular ring connector 11-7 is provided at the first end of the central pull rod 11-4, and an external thread section 11-8 is provided on the outer wall of the second end of the central pull rod 11-4. An eccentric cam is integrally formed at the root of the operating handle 11-1. The eccentric cam is pivotally connected to the circular ring connector 11-7 through a transversely inserted pin. The pressure washer 11-2... 2. The first flat washer 11-3 and the pressure washer 11-2 are slidably sleeved on the central pull rod 11-4. The upper end face of the pressure washer 11-2 directly abuts against the outer contour of the eccentric cam, forming a frictional force transmission fit of the cam follower surface. The upper end face of the pressure washer 11-2 and the first flat washer 11-3 form the first clamping working surface. The adjusting nut 11-6 is provided with an internal thread that matches the tail of the central pull rod 11-4. It is screwed into the second end of the central pull rod 11-4 through the thread pair. The second flat washer 11-5 and the adjusting nut 11-6 form the second clamping working surface. The bottom of the two headrest connecting rods 15 are respectively set at the first clamping working surface and the second clamping working surface.

[0029] The bottom of each of the two headrest connecting rods 15 is provided with a U-shaped opening, which is fitted onto the central tie rod 11-4 and is respectively located at the first clamping working surface and the second clamping working surface.

[0030] When it is necessary to disassemble or adjust the headrest connecting rod 15, quick unlocking is required. The operator holds the operating handle 11-1 and pulls it upwards. The eccentric cam rotates to its low radius profile, releasing the axial pressure on the pressure washer 11-2. The first flat washer 11-3 loses its downward pressure, the first clamping working surface loosens, and the adjusting nut 11-6 is loosened, the second clamping working surface loosens, allowing the operator to easily remove or adjust the headrest connecting rod 15.

[0031] After adjustment, when quick locking is required, the operator holds the operating handle 11-1 and pulls it downwards. The operating handle 11-1 rotates around the transverse pin, causing the eccentric cam part integrally formed at the root to rotate. As the cam profile rotates, its highest point gradually presses against the upper end face of the pressure washer 11-2. During movement, the pressure washer 11-2 provides a downward thrust to the headrest connecting rod 15, which clamps the headrest connecting rod 15 between the first flat washer 11-3 and the pressure washer 11-2. The first clamping working surface clamps the headrest connecting rod 15, and the adjusting nut 11-6 is tightened. The second clamping working surface then clamps the headrest connecting rod 15.

[0032] like Figure 5 As shown, the adaptive gravity-compensated suspended hand support assembly includes a fixed base 17, a linkage mechanism 16, a triangular coupling plate 18, a damping spring 19, and an end U-shaped rotating bracket 20. The linkage mechanism 16 is a long rod. The fixed base 17 is rigidly fixed to the surface of the front drive box 21 of the vehicle body by bolts. The first vertex of the triangular coupling plate 18 is hinged to the bracket of the fixed base 17 by a pin. The damping spring 19 acts on the second vertex of the triangular coupling plate 18. A dynamic force balance system is constructed by the inclined damping spring 19. The third vertex of the triangular coupling plate 18 is hinged to one end of the linkage mechanism 16 by a pin. The other end of the linkage mechanism 16 is connected to the end U-shaped rotating bracket 20.

[0033] Work process: When the operator opens the handle of the quick-release structure 11, the frictional locking force between the headrest connecting rod 15 and the headrest support rod 10 is released. At this time, the headrest connecting rod 15 can rotate around the central pull rod 11-4, thereby driving the U-shaped headrest 9 to adjust the tilt angle to fit the operator's face or forehead. After adjusting to the appropriate angle, the operator locks the operating handle 11-1. The second flat washer 11-5 and the adjusting nut 11-6, and the pressure washer 11-2 and the first flat washer 11-3 generate axial clamping force, firmly pressing and fixing the headrest connecting rod 15 to the headrest support rod 10, eliminating relative rotation and ensuring stable headrest support during operation.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A lightweight, retractable agricultural work vehicle, characterized in that: The vehicle includes a three-section folding panel assembly, an aluminum profile frame (5), a multi-angle adjustable headrest support assembly, two adaptive gravity-compensated floating handrest assemblies, and a power module (12). The two adaptive gravity-compensated floating handrest assemblies are symmetrically mounted on the front drive box (21) of the vehicle body. The three-section folding panel assembly includes a backrest (1), a seat (2), a chest plate (3), and a seat support leg (7). The backrest (1) is connected to one end of the seat (2), and the other end of the seat (2) is connected to the other end of the seat (2). The chest plate (3) is hinged to the chest plate (3) by hinges (8). The multi-angle adjustable headrest support assembly is located at the bottom of the chest plate (3). The aluminum profile frame (5) is provided with a longitudinal guide rail (4) and a sliding assembly. The bottom of the seat plate (2) is connected to the sliding assembly. The sliding assembly is located in the longitudinal guide rail (4) to enable the three-section folding plate assembly to move along the longitudinal guide rail (4). The aluminum profile frame (5) is provided with the power module (12).

2. The lightweight, recumbent agricultural work trolley according to claim 1, characterized in that, The sliding assembly includes a seat support leg (7) and a slider (6). The slider (6) is disposed in the longitudinal guide rail (4), and the bottom of the seat support leg (7) is fixedly provided with the slider (6).

3. The lightweight, recumbent agricultural work trolley according to claim 2, characterized in that, The longitudinal guide rail (4) includes a base (4-2) and a cylindrical guide rail shaft (4-1). The base (4-2) is mounted on the aluminum profile frame (5), and the cylindrical guide rail shaft (4-1) is mounted on the base (4-2). The slider (6) includes a body (6-1), a bearing mounting cavity (6-2), a locking screw (6-3), and a fastening screw hole (6-4). The bearing mounting cavity (6-2) is located inside the body (6-1), and a linear ball bearing (6-6) is embedded in the bearing mounting cavity (6-2). The linear ball bearing (6-6) is sleeved on the outside of the cylindrical guide shaft (4-1). A radial threaded through hole is provided on the side wall of the body (6-1) and connects to the bearing mounting cavity (6-2). The locking screw (6-3) is screwed into the radial threaded through hole. When locked, the locking screw (6-3) screws radially forward and presses against the bearing mounting cavity (6-4). The linear ball bearing (6-6) in the bearing mounting cavity (6-2) causes the linear ball bearing (6-6) to generate a radial tightening effect and hold the cylindrical guide shaft (4-1), thereby increasing the static friction between the linear ball bearing (6-6) and the cylindrical guide shaft (4-1), restricting the axial displacement of the slider (6) along the cylindrical guide shaft (4-1), and realizing the position locking of the slider (6). The top surface of the body (6-1) is provided with a plurality of fastening screw holes (6-4) arranged in a matrix, and the bottom of the seat support leg (7) is provided with a through hole. The fastening screw holes (6-4) are used to connect and fix with the through hole by screws.

4. The lightweight, recumbent agricultural work trolley according to claim 3, characterized in that, The multi-angle adjustable headrest support assembly includes a U-shaped headrest (9), a headrest support rod (10), a quick-release structure (11), and two headrest connecting rods (15). The U-shaped headrest (9) is bolted between the two headrest connecting rods (15). The two headrest connecting rods (15) are detachably mounted on one side of the quick-release structure (11). The quick-release structure (11) can apply an axial clamping force to the headrest connecting rods (15) to achieve position adjustment of the headrest connecting rods (15). The other side of the quick-release structure (11) is provided with the headrest support rod (10). A guide (13) is provided on the chest plate (3). The guide member (13) is provided with a connecting plate (13-1) and a guide tube (13-2). The connecting plate (13-1) is fixed to the bottom of the chest plate (3) by bolts. The guide tube (13-2) is provided with a threaded connection hole (13-3). A locking bolt is provided in the threaded connection hole (13-3). The headrest support rod (10) passes through the guide tube (13-2). The position of the headrest support rod (10) is fixed by tightening the locking bolt that passes through the threaded connection hole (13-3). The extension length of the headrest support rod (10) is adjusted by loosening the locking bolt.

5. The lightweight, recumbent agricultural work trolley according to claim 4, characterized in that, The quick-release structure (11) includes an operating handle (11-1), a pressure washer (11-2), a central pull rod (11-4), and an adjusting nut (11-6). The central pull rod (11-4) is cylindrical with a long axis. A first flat washer (11-3) is fixedly provided at the first end near the central pull rod (11-4), and a second flat washer (11-5) is fixedly provided at the second end near the central pull rod (11-4). A circular ring connector (11-7) is provided at the first end of the central pull rod (11-4), and an external thread section (11-8) is provided on the outer wall of the second end of the central pull rod (11-4). An eccentric cam is integrally formed at the root of the operating handle (11-1). The eccentric cam is pivotally connected to the circular ring connector (11-7) through a transversely inserted pin. The pressure washer (11-2) and... The first flat washer (11-3) is coaxial with the first flat washer (11-3) and the pressure washer (11-2) is slidably sleeved on the central pull rod (11-4). The upper end face of the pressure washer (11-2) directly abuts against the outer contour of the eccentric cam, forming a frictional force transmission fit of the cam follower surface. The upper end face of the pressure washer (11-2) and the first flat washer (11-3) forms a first clamping working surface. The adjusting nut (11-6) is provided with an internal thread that matches the tail of the central pull rod (11-4). It is screwed onto the second end of the central pull rod (11-4) through the thread pair. The second flat washer (11-5) and the adjusting nut (11-6) form a second clamping working surface. The bottoms of the two headrest connecting rods (15) are respectively located at the first clamping working surface and the second clamping working surface.

6. The lightweight, recumbent agricultural work trolley according to claim 5, characterized in that, Both headrest connecting rods (15) have U-shaped openings at their bottoms. The U-shaped openings are fitted onto the central pull rod (11-4) and are respectively located at the first clamping working surface and the second clamping working surface.

7. The lightweight, dual-purpose (sitting and lying) agricultural work trolley according to claim 6, characterized in that, The adaptive gravity-compensated suspended hand support assembly includes a fixed base (17), a linkage mechanism (16), a triangular coupling plate (18), a damping spring (19), and an end U-shaped rotating bracket (20). The linkage mechanism (16) is a long rod. The fixed base (17) is rigidly fixed to the surface of the front drive box (21) of the vehicle body by bolts. The first vertex of the triangular coupling plate (18) is hinged to the bracket of the fixed base (17) by a pin. The damping spring (19) acts on the second vertex of the triangular coupling plate (18). A dynamic force balance system is constructed by the obliquely placed damping spring (19). The third vertex of the triangular coupling plate (18) is hinged to one end of the linkage mechanism (16) by a pin. The other end of the linkage mechanism (16) is connected to the end U-shaped rotating bracket (20).

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