Lifting device operating mechanism and tractor

Abstract

The utility model relates to agricultural machinery technical field, more particularly, relates to a kind of hoist operating mechanism and tractor.The hoist operating mechanism includes operating handle, first pivot, connecting pull rod, operating pull rod, rotary connecting rod, sliding pull rod and second pivot;One end of operating handle is fixedly connected with one end of connecting pull rod, and rotationally arranged on first pivot;The other end of connecting pull rod is rotatably connected with one end of operating pull rod, the other end of operating pull rod is rotatably connected with one end of rotary connecting rod, the other end of rotary connecting rod is arranged at one end of second pivot, and one end of sliding pull rod is arranged at the other end of second pivot.The utility model significantly improves the operating feeling;It improves operating precision and life;Overall structure is compact, and assembly, maintenance is easy, and operating feeling is good, applicable to various tractors and other agricultural machinery.

Description

Technical Field

[0001] This utility model relates to the field of agricultural machinery technology, and more specifically, to a lifting device control mechanism and a tractor. Background Technology

[0002] The lifting arm on the hoist is controlled to rise and fall by a handle driving a crossbar, which in turn drives the base mechanism. This method has the following drawbacks:

[0003] 1) The root control and the transition crossbar are connected by bolts. After a long period of use or when the lifting arm is subjected to a large force, the bolts may loosen, affecting the accuracy of the control in raising and lowering the lifting arm (agricultural implement). In addition, the bolts are located below the floor, making it difficult to tighten them again.

[0004] 2) The control handle and the root control are connected by a transition crossbar. When the lifting arm is subjected to a large force, the transition crossbar will tilt or deform, affecting the accuracy of the control in raising and lowering the lifting arm (agricultural implement).

[0005] 4) This lifting control structure is unsupported and simple in structure, which affects the feel of operation. Utility Model Content

[0006] The purpose of this utility model is to provide a lifting device control mechanism and a tractor that can solve the above-mentioned technical problems.

[0007] In a first aspect, this utility model provides a lifting device operating mechanism, including an operating handle, a first rotating shaft, a connecting rod, an operating rod, a rotating link, a sliding rod, and a second rotating shaft;

[0008] One end of the control handle is fixedly connected to one end of the connecting rod, and is rotatably mounted on the first rotating shaft;

[0009] The other end of the connecting rod is rotatably connected to one end of the operating rod, the other end of the operating rod is rotatably connected to one end of the rotating link, the other end of the rotating link is located at one end of the second rotating shaft, and one end of the sliding rod is located at the other end of the second rotating shaft.

[0010] In an optional embodiment, a first support is further included, on which the first rotating shaft is rotatably mounted.

[0011] In an optional embodiment, a second support is also included, through which the second pivot can be fixed to the floor.

[0012] In an optional embodiment, the second support includes a bracket and a rotating cylinder;

[0013] One end of the bracket is set on the floor, and the other end is fixedly connected to the rotating cylinder;

[0014] The second rotating shaft is rotatably mounted inside the rotating cylinder.

[0015] In an optional embodiment, the connection between the bracket and the rotating cylinder is either welded or integrally formed.

[0016] In an optional embodiment, a first limiting structure is provided between the rotating cylinder and the second rotating shaft to restrict the axial movement of the second rotating shaft within the rotating cylinder.

[0017] In an optional embodiment, the other end of the sliding rod is connected to a swing link, which is used to connect to the lifting rocker arm.

[0018] In an optional embodiment, the swing link is provided with a second limiting structure to limit the swing angle range of the swing link.

[0019] In an optional embodiment, the second limiting structure includes a limiting rod and a limiting groove;

[0020] The limiting groove is fixedly installed, and one end of the limiting rod is fixed to the swing connecting rod, while the other end is slidably installed in the limiting groove on the limiting groove.

[0021] Secondly, this utility model provides a tractor, including the lifting device control mechanism described in any of the foregoing embodiments.

[0022] The beneficial effects of this utility model embodiment are:

[0023] The dual-pivot structure formed by the first and second pivots and corresponding supports significantly improves the rigidity of the control system, avoids the control error caused by the deformation of the traditional crossbar, and improves the control feel; the traditional bolt connection is eliminated and a pivot-linkage mechanism is adopted to solve the problem of bolt loosening, improve control accuracy and service life; the overall structure is compact, easy to assemble and maintain, and has a good control feel, making it suitable for various tractors and other agricultural machinery. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A front view of the lifting mechanism provided in an embodiment of this utility model;

[0026] Figure 2 A side view of the lifting mechanism provided in an embodiment of the present utility model;

[0027] Figure 3 A three-dimensional structural diagram of the lifting device operating mechanism provided in an embodiment of this utility model.

[0028] Icons: 1-Control handle; 2-First support; 3-First pivot; 4-Connecting rod; 5-Control rod; 6-Floor; 7-Rotating link; 8-Second pivot; 9-Sliding rod; 10-Swing link; 11-Limit groove; 12-Rotating cylinder; 13-Bracket. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0033] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0034] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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 utility model based on the specific circumstances.

[0035] The following is combined with Figures 1-3 The following describes some embodiments of the present invention in detail. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0036] Firstly, this utility model provides a lifting device operating mechanism, such as... Figure 1 , Figure 2 and Figure 3 As shown, it includes a control handle 1, a first rotating shaft 3, a connecting rod 4, a control rod 5, a rotating connecting rod 7, a sliding rod 9, and a second rotating shaft 8. One end of the control handle 1 is fixedly connected to one end of the connecting rod 4 and is rotatably mounted on the first rotating shaft 3. The other end of the connecting rod 4 is rotatably connected to one end of the control rod 5, and the other end of the control rod 5 is rotatably connected to one end of the rotating connecting rod 7. The other end of the rotating connecting rod 7 is located at one end of the second rotating shaft 8, and one end of the sliding rod 9 is located at the other end of the second rotating shaft 8.

[0037] In this embodiment, the lifting device control mechanism consists of seven parts: a control handle 1, a first rotating shaft 3, a connecting rod 4, a control rod 5, a rotating link 7, a sliding link 9, and a second rotating shaft 8. The control handle 1 is a long rod, with one end for the driver to hold and the other end rigidly connected to one end of the connecting rod 4. The connecting rod 4 and the control handle 1 are coaxially mounted on the first rotating shaft 3 at the connection point, forming a rotating pair. The control handle 1 and the connecting rod 4 have a set angle. The other end of the connecting rod 4 is hinged to the first end of the control rod 5 via a spherical bearing or a pin. The tail end of the control rod 5 is then hinged to the first end of the rotating link 7, forming a Z-shape with the connecting rod 4, the control rod 5, and the rotating link 7. The tail end of the rotating link 7 is rigidly connected to one end of the second rotating shaft 8, and the first end of the sliding link 9 is rigidly connected to the other end of the second rotating shaft 8. The second rotating shaft 8 is used to translate the power from one end to the other. The tail end of the sliding rod 9 is connected to the external lifting rocker arm via a ball joint or pin. The entire system constitutes a series-parallel hybrid mechanism of "handle - four-bar linkage - sliding rod 9 - rocker arm", without any intermediate transition crossbars, completely eliminating the weak bolt connections in the prior art.

[0038] Specifically, in this embodiment, the control handle 1 converts the torque applied by the driver into angular displacement; the first rotating shaft 3 provides a low-friction fulcrum for the handle and simultaneously decomposes the operating force perpendicular to the floor 6 onto the plane of the floor 6; the connecting rod 4 and the control rod 5 convert the angular displacement into linear displacement and amplify or reduce the stroke; the rotating linkage 7 converts the linear displacement back into angular displacement; the second rotating shaft 8 synchronously transmits the angular displacement of the rotating linkage 7 to the sliding rod 9; the sliding rod 9 finally converts the angular displacement into the linear lifting motion of the rocker arm. Through the above multi-stage conversion, a complete kinematic chain of "rotational input - multi-stage displacement conversion - linear output" is realized. Because the easily loosened bolt transition structure is eliminated, the backlash of the entire kinematic chain is extremely small, and the operating precision is significantly improved.

[0039] In this embodiment, let the swing angle of the operating handle 1 be θ1, the effective length of the connecting rod 4 be L1, the effective length of the operating rod 5 be L2, the swing angle of the rotating link 7 be θ2, and the swing arm length of the sliding rod 9 be L3. Then, the displacement of the lifting rocker arm is S = L3·sin(θ2). By changing L1, L2, and L3, the stroke amplification ratio can be infinitely adjusted. Near the limit position, the four-bar linkage can form a self-locking mechanism to prevent the handle from returning to its original position due to vibration. While transmitting torque, the second rotating shaft 8 converts rotation into linear motion through the sliding rod 9. Its transmission efficiency is similar to that of a crank-slider mechanism, and its mechanical efficiency can reach over 90%.

[0040] In use, the operator pushes the handle forward, θ1 increases, S increases in the positive direction, and the lifting rocker arm rises; pulling the handle in the opposite direction decreases θ1 and S decreases in the reverse direction, and the lifting rocker arm descends. The handle can be released at any position of its travel, and the mechanism self-locks at that angle, maintaining the height of the rocker arm.

[0041] In an optional embodiment, a first support 2 is also included, and the first rotating shaft 3 is rotatably mounted on the first support 2.

[0042] In this embodiment, the first support 2 is a plate structure, which is fixed to the side plate by bolts and is set at a certain height from the floor 6 to reserve space for the connecting rod 4 and the operating rod 5.

[0043] Specifically, in this embodiment, the first support 2 bears all the operating forces applied by the control handle 1, the connecting rod 4, the control rod 5, and the driver, and distributes these forces evenly to the side wall of the cab through bolts on the base plate.

[0044] In this embodiment, the first support 2 is made of stainless steel plate.

[0045] In an optional embodiment, a second support is also included, through which the second pivot 8 can be fixed to the floor 6.

[0046] In this embodiment, the second support acts as the far-end fulcrum, and the second support directly transmits the pushing and pulling forces generated by the sliding rod 9 to the longitudinal beam of the floor 6, thus preventing the cantilever deformation of the second pivot 8.

[0047] In an optional embodiment, the second support includes a bracket 13 and a rotating cylinder 12; one end of the bracket 13 is disposed on the floor 6, and the other end is fixedly connected to the rotating cylinder 12; the second rotating shaft 8 is rotatably disposed inside the rotating cylinder 12.

[0048] In this embodiment, the second support consists of a bracket 13 and a rotating cylinder 12.

[0049] Specifically, the support 13 includes a base plate and an upright plate, which are perpendicular to each other and are L-shaped or inverted T-shaped.

[0050] The base plate and floor 6 are locked together by fasteners; the upper end of the upright plate is fixedly connected to the outer wall of the rotating cylinder 12, forming a rigid node. The interior of the rotating cylinder 12 forms a continuous cylindrical cavity through which the second rotating shaft 8 passes and rotates; both ends of the rotating cylinder 12 are open, and there is no gap between the outer wall and the support 13. The connection area between the outer wall of the rotating cylinder 12 and the support 13 is a continuous closed ring, the width of which is greater than the cylinder radius, ensuring continuous force flow.

[0051] In this embodiment, the support 13 directly transmits the supporting reaction force from the floor 6 to the outer wall of the rotating cylinder 12, which then evenly distributes the supporting force to the entire length of the second rotating shaft 8. The height of the support 13's upright plate determines the distance between the rotating cylinder 12 and the floor 6, ensuring that the sliding tie rod 9 maintains a safe clearance from surrounding components during its swing. The rotating cylinder 12 provides radial constraint to the second rotating shaft 8, preventing shaft deflection; simultaneously, it allows the shaft to rotate freely within the cylinder without transmitting additional bending moment to the support 13. The entire support structure ensures that the distal fulcrum of the operating mechanism is stable and free from wobbling.

[0052] The "column-sleeve" structure formed by the support 13 and the rotating cylinder 12 decomposes the spatial force system: the support 13 bears bending moment and shear force, while the rotating cylinder 12 bears radially distributed force. The force flow is transmitted from top to bottom within the vertical plate of the support 13 and diffuses to the floor 6 through the base plate; the rotating cylinder 12 converts the radial force into circumferential tensile stress through circumferential tension, eliminating stress concentration. Mechanically, this structure is equivalent to a combination of a simply supported beam and a cylinder, giving the distal support both high stiffness and rotational freedom.

[0053] During installation, first attach and lock the base plate of bracket 13 to floor 6; then weld or cast the rotating cylinder 12 to the upright plate of bracket 13; next, insert the second rotating shaft 8 into the rotating cylinder 12 and connect it to the sliding tie rod 9 and the rotating connecting rod 7 respectively; finally, check the gaps between the two ends of the rotating cylinder 12 and the external components to ensure there is no interference. During maintenance, only visual inspection of the welds or casting body of bracket 13 for cracks is required; it is not necessary to disassemble floor 6.

[0054] In this embodiment, the bracket 13 and the rotating cylinder 12 can be made into an integral casting, and the upright plate and the cylinder can be combined into a single piece; the bracket 13 can also be changed into a double-eared hanging plate, and the rotating cylinder 12 can be changed into a short sleeve embedded between the lifting ears; the bracket 13 and the rotating cylinder 12 can also be separated and clamped by bolts to achieve a detachable structure.

[0055] In an optional embodiment, the connection between the bracket 13 and the rotating cylinder 12 is either welding or integral.

[0056] In this embodiment, the connection between the bracket 13 and the rotating cylinder 12 includes a continuous fillet weld connection or an integral casting connection.

[0057] Specifically, in this embodiment, when continuous fillet welds are used for connection, welding is performed along the entire length of the contact line between the outer wall of the rotating cylinder 12 and the vertical plate of the support 13. The weld cross-section is an isosceles triangle with a smooth transition at the weld toe.

[0058] Specifically, in this embodiment, when integral casting is used, the components are formed in one step within the mold, and there is no interface between the support plate 13 and the outer wall of the rotating cylinder 12, with continuous metal fibers.

[0059] Both designs ensure that the support 13 is perpendicular to the axis of the rotating cylinder 12 and is in a fixed position. The support 13 transfers the load to the rotating cylinder 12 without gaps, and the rotating cylinder 12 then transfers the load evenly to the second rotating shaft 8, avoiding local deformation.

[0060] The bracket 13 and the rotating cylinder 12 can be connected by friction welding to achieve the connection of dissimilar materials; they can also be connected by riveting or bolt clamping to form a detachable node; or they can be connected by adhesive bonding or heat fitting to achieve a weld-free connection.

[0061] In an optional embodiment, a first limiting structure is provided between the rotating cylinder 12 and the second rotating shaft 8 to limit the axial movement of the second rotating shaft 8 within the rotating cylinder 12.

[0062] In this embodiment, a first limiting structure is disposed between the rotating cylinder 12 and the second rotating shaft 8, comprising a shoulder and a retaining spring combination. The shoulder is an annular boss formed on the outer circumference of the second rotating shaft 8, the width of which is greater than the thickness of the end face of the rotating cylinder 12; the retaining spring is an open elastic ring, installed in an annular groove on the outer side of the end face of the rotating cylinder 12. The inner diameter of the retaining spring is smaller than the outer diameter of the shoulder, forming an axial obstruction. A small gap is left between the shoulder and the retaining spring, allowing the shaft to freely expand and contract due to temperature changes.

[0063] The shoulder bears the axial thrust generated by the sliding rod 9 and transmits the thrust directly to the end face of the rotating cylinder 12; the retaining spring bears the reverse axial tension and prevents the second rotating shaft 8 from disengaging outward. Together, they maintain a constant axial position of the second rotating shaft 8 within the rotating cylinder 12, ensuring that the plane of motion of the sliding rod 9 remains unchanged. The first limiting structure does not increase the radial dimension and does not affect the rotation of the shaft.

[0064] The shoulder and the retaining ring form a two-way mechanical stop. The force flow path is: axial force → shoulder → end face of rotating cylinder 12 → bracket 13 → floor 6; reverse force → retaining ring → end face of rotating cylinder 12 → bracket 13 → floor 6. The force flow is closed, and no additional bending moment acts on the shaft body; the small gap compensates for thermal expansion and avoids jamming.

[0065] During assembly, first insert the second rotating shaft 8 into the rotating cylinder 12, ensuring the shoulder is flush against one end of the rotating cylinder 12; then install the retaining circlip into the groove at the other end, ensuring the retaining circlip is fully seated at the bottom of the groove; finally, rotate the shaft several times to confirm there is no axial movement. During maintenance, simply visually inspect the retaining circlip for breakage or deformation, and replace it with retaining circlip pliers if necessary.

[0066] It is understandable that the first limiting structure can be the structure described above, but it is not limited to the structure described above. It can also be changed to a nut locking with a cotter pin to achieve an adjustable clearance; a wave spring washer can also be used to provide preload; or threads can be machined on the shaft and fitted with a locking nut to achieve a snap ring-free structure. In other words, as long as the axial positioning between the second rotating shaft 8 and the rotating cylinder 12 can be achieved, it is acceptable.

[0067] In an optional embodiment, the other end of the sliding rod 9 is connected to a swing link 10, which is used to connect the lifting rocker arm.

[0068] In this embodiment, the swing link 10 has a hinge hole at each end. One end of the swing link 10 is connected to the tail end of the sliding tie rod 9 via a pin, and the other end is connected to the lifting rocker arm via a pin or other structure. The thickness and width of the swing link 10 are determined according to the magnitude of the force, and the material is weldable and forgeable medium carbon alloy steel. The entire link can swing around the two hinge points in a vertical plane.

[0069] The swing linkage 10 converts the linear reciprocating motion of the sliding rod 9 into the up-and-down swinging motion of the lifting rocker arm; it also acts as a lever to amplify or reduce the stroke, changing the relationship between force and speed. The linkage itself has no elastic deformation, ensuring the immediacy of motion transmission; the hinged structure at both ends absorbs manufacturing errors and reduces assembly difficulty.

[0070] The swing link 10 forms a "rocker" mechanism with a circular motion trajectory. By changing the position of the hinge point, the swing angle range of the rocker can be adjusted to meet different lifting height requirements. The force is transmitted in tension and compression within the link, with no bending stress concentration and high material utilization.

[0071] In an optional embodiment, the swing link 10 is provided with a second limiting structure for limiting the swing angle range of the swing link 10.

[0072] In this embodiment, the second limiting structure can provide a reliable and repeatable swing boundary for the swing link 10, thereby ensuring the safety and operational accuracy of the entire lifting device control mechanism.

[0073] When the driver issues a lifting command via the control handle 1, the swing link 10 reciprocates under the pushing and pulling action of the sliding rod 9. Without boundary constraints, the swing link 10 could easily swing excessively towards the floor 6, tires, mudguards, or other surrounding components, causing mechanical interference, damage to parts, or even personal injury. The second limiting structure applies a reverse constraint force immediately when the swing link 10 reaches its design limit angle, forcing it to stop moving and controlling potential risks within the design limits. This structure not only acts as a "hard safety" measure in emergencies but also serves as a benchmark for daily adjustments, helping operators quickly locate key angles such as transport, work, and descent positions, reducing repeated fine-tuning time and improving operational efficiency.

[0074] Meanwhile, due to the constraint effect of the second limiting structure, the swing link 10 completes each swing within the same trajectory, effectively reducing uneven wear of the link, pin and bearing, and extending the maintenance cycle; the rigid boundary it provides can also suppress the overshoot phenomenon that may be generated by the hydraulic system, so that the stopping accuracy of the lifting rocker arm no longer depends entirely on the response speed of the hydraulic valve, thereby improving the stability and reliability of the whole machine on bumpy ground or when the load changes suddenly.

[0075] In an optional embodiment, the second limiting structure includes a limiting rod and a limiting groove 11 body; the limiting groove 11 body is fixedly disposed, one end of the limiting rod is fixed to the swing connecting rod 10, and the other end is slidably disposed in the limiting groove 11 on the limiting groove 11 body.

[0076] In this embodiment, the second limiting structure consists of a limiting rod and a limiting groove 11. The limiting rod is a rigid cylindrical rod, with one end fixed to the side of the swing connecting rod 10 and the other end extending into the arc-shaped groove of the limiting groove 11. The limiting groove 11 is a plate-shaped component with an arc-shaped through groove machined on its surface. The groove width is slightly larger than the diameter of the limiting rod, and both ends of the groove are closed. The limiting groove 11 is fixed to the floor 6 or the bracket 13 by bolts or welding, and its position cannot be moved.

[0077] The limiting rod slides within the arc-shaped groove, converting the angular displacement of the swing link 10 into a circular arc sliding displacement within the groove; the two ends of the groove are closed to form a hard limit, ensuring that the swing link 10 can only swing within the designed angle range. The groove also serves as a guide and dustproof, preventing foreign objects from entering the mechanism.

[0078] The center of the arc-shaped groove coincides with the rotation center of the swing link 10, ensuring that the movement trajectory of the limiting rod is completely consistent with the groove path, thus preventing jamming. The two ends of the groove are closed to form a mechanical stop, and the force flow path is: swing link 10 → limiting rod → groove end face → groove body → floor 6. The entire structure has no elastic elements, resulting in high limiting accuracy.

[0079] During installation, first fix the limiting groove 11 to the floor 6, then weld the limiting rod to the side of the swing connecting rod 10, ensuring that the rod and the groove are coaxial. During debugging, manually drive the swing connecting rod 10 to its limits at both ends and check that the gap between the rod and the groove wall is uniform. Routine maintenance only requires cleaning the dirt in the groove and applying grease.

[0080] Secondly, this utility model provides a tractor, including the lifting device control mechanism described in any of the foregoing embodiments.

[0081] The beneficial effects of this utility model embodiment are:

[0082] The first rotating shaft 3, the second rotating shaft 8, and the corresponding support form a double-fulcrum structure, which significantly improves the rigidity of the control system, avoids the control error caused by the deformation of the traditional crossbar, and improves the control feel; the traditional bolt connection is eliminated and the rotating shaft-linkage mechanism is adopted to solve the problem of bolt loosening, improve the control accuracy and service life; the overall structure is compact, easy to assemble and maintain, and has a good control feel, making it suitable for various tractors and other agricultural machinery.

[0083] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A lifting device operating mechanism, characterized in that, It includes a control handle, a first rotating shaft, a connecting rod, a control rod, a rotating link, a sliding rod, and a second rotating shaft; One end of the control handle is fixedly connected to one end of the connecting rod, and is rotatably mounted on the first rotating shaft; The other end of the connecting rod is rotatably connected to one end of the operating rod, the other end of the operating rod is rotatably connected to one end of the rotating link, the other end of the rotating link is located at one end of the second rotating shaft, and one end of the sliding rod is located at the other end of the second rotating shaft.

2. The lifting device operating mechanism according to claim 1, characterized in that, It also includes a first support, on which the first rotating shaft is rotatably mounted.

3. The lifting device operating mechanism according to claim 1, characterized in that, It also includes a second support, through which the second pivot can be fixed to the floor.

4. The lifting device operating mechanism according to claim 3, characterized in that, The second support includes a bracket and a rotating cylinder; One end of the bracket is set on the floor, and the other end is fixedly connected to the rotating cylinder; The second rotating shaft is rotatably mounted inside the rotating cylinder.

5. The lifting device operating mechanism according to claim 4, characterized in that, The connection between the bracket and the rotating cylinder can be either welded or integrally formed.

6. The lifting device operating mechanism according to claim 4, characterized in that, A first limiting structure is provided between the rotating cylinder and the second rotating shaft to restrict the axial movement of the second rotating shaft within the rotating cylinder.

7. The lifting device operating mechanism according to claim 1, characterized in that, The other end of the sliding rod is connected to a swing link, which is used to connect the lifting rocker arm.

8. The lifting device operating mechanism according to claim 7, characterized in that, The swing link is provided with a second limiting structure to limit the swing angle range of the swing link.

9. The lifting device operating mechanism according to claim 8, characterized in that, The second limiting structure includes a limiting rod and a limiting groove; The limiting groove is fixedly installed, and one end of the limiting rod is fixed to the swing connecting rod, while the other end is slidably installed in the limiting groove on the limiting groove.

10. A tractor, characterized in that, Includes the lifting mechanism as described in any one of claims 1-9.

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