Special hoisting machine for agricultural equipment and hoisting method

Abstract

The invention relates to the field of winch traction, in particular to a hoisting machine special for agricultural equipment and a hoisting method.The hoisting machine comprises a base and a supporting arm, and the supporting arm is connected with a winch assembly used for hoisting the equipment; according to the multi-point limiting hoisting device, the hoisting rope is driven to sequentially penetrate and slide at the limiting sleeves distributed in the circumferential direction, so that the hoisting rope correspondingly forms rope loops at the limiting sleeves, multi-point limiting hoisting of agricultural equipment is achieved through uniform distribution of the multiple rope loops, the hoisting stability is effectively improved, and shaking and deflection of the equipment are avoided.

Description

Technical Field

[0001] The invention relates to the field of winch traction, and in particular to a special hoisting machine and a hoisting method for agricultural machinery. Background Art

[0002] With the advancement of science and technology and changes in market demand, the level of agricultural mechanization has made significant progress in recent years, and the application of various large-scale agricultural machinery and equipment has become more and more extensive. In the agricultural production process, the handling and installation of agricultural machinery and equipment is an important but time-consuming and labor-intensive link. Although the existing general lifting machinery can meet some of the needs, their design often fails to fully consider the special structure and weight distribution of agricultural machinery and equipment, resulting in inconvenient operation and prone to safety problems.

[0003] With the advancement of science and technology, technicians in related fields have also optimized the lifting technology used for agricultural machinery and equipment. In order to make a more accurate comparison, a Chinese patent with announcement number CN213771040U discloses an agricultural machinery lifting machine, including a base, a hydraulic rod, an equipment box, a pillar, a telescopic rod, a fixer, a steel rope and a hook mechanism, etc. When in use, the pin column in the hook mechanism is inserted into the column groove to prevent the objects from falling off due to shaking during the lifting process. After the pin column is inserted, such problems are effectively avoided. The rope of the hoisted object is engaged by the buffer groove, and the rubber sleeve is put on to prevent the lifting rope from rubbing back and forth and causing the life of the rope to be accelerated.

[0004] However, when the above-mentioned prior art is used to hoist agricultural machinery, the following problems still exist: The above-mentioned prior art fixes the items to be hoisted with a hoisting rope, puts them into the hook and hangs them, then presses the controller down through the movable slot to drive the internal spring to stretch, and after pulling it to a certain position, bends it to the left to disengage the controller from the movable slot and engage it with the wall on the side of the movable slot, and then determines whether the latch column is inserted into the column slot and wraps it to achieve the effect of limiting the hoisting rope and engaging it on the hook. During use, the hoisting equipment is limitedly connected by only a steel rope and a hook. During the process of lifting the equipment, it is necessary to ensure that the connection point of the hoisting rope is at least on the axis of the center of gravity of the equipment to be hoisted. Otherwise, it is easy for the equipment to deflect and shake significantly after being lifted, which may lead to safety problems.

[0005] Therefore, based on the above-stated viewpoint, there is still room for optimization in the existing technical means for lifting agricultural machinery. Summary of the invention

[0006] In order to solve the above problems, the present invention provides a special lifting machine for agricultural machinery equipment, including a base and a support arm, and a winch assembly for lifting the equipment is connected to the support arm.

[0007] The hoisting assembly comprises: The winding drum is limit-connected to one side of the supporting arm close to the base, and a lifting rope is wound on the winding drum for lifting.

[0008] The pulley is limited at a side of the support arm away from the winding drum, and the lifting rope is driven by the winding drum to slide and adjust along the pulley.

[0009] The adjustment end is limited on the side of the lifting rope away from the winding drum, and is used to adjust and limit the lifting rope after being released from the winding drum, so that the lifting rope is limited to multiple sections for lifting agricultural machinery equipment.

[0010] Preferably, the adjusting end comprises a plurality of limiting sleeves which are limitedly sleeved on the lifting rope, and a supporting chassis for limitingly supporting the limiting sleeves is commonly connected between the plurality of limiting sleeves.

[0011] Preferably, the lifting rope is in the form of two strands, which are limitedly inserted into the limiting sleeve and slide out of the limiting sleeve.

[0012] Preferably, the lifting rope released from the winding drum is sequentially passed through a plurality of limiting sleeves, and then passes through the last limiting sleeve to be connected to the support arm.

[0013] Preferably, the adjustment end also includes an adjustment rotating rod passing through the middle of the supporting chassis, and a limit support plate is connected to the adjustment rotating rod for limiting and guiding the sliding paths of all limit sleeves. A driving gear is sleeved on the adjustment rotating rod, and a plurality of driven gear plates corresponding to the limit sleeves are meshed on the outer side of the driving gear, and the driven gear plate and the limit sleeve are connected by a connecting guide block.

[0014] Preferably, a plurality of pulleys are provided corresponding to the plurality of limiting sleeves, and the plurality of pulleys and limiting sleeves are evenly distributed in the circumferential direction with the axis of the supporting chassis as the axis.

[0015] Preferably, the limit support plate is connected to a mounting frame, and the mounting frame is provided with symmetrical limit rollers for supporting and limiting the lifting rope between two adjacent limit sleeves.

[0016] Preferably, the limiting sleeve is arranged in a bent shape, and the limiting sleeve is connected to a guide slider which is penetrated on the supporting chassis.

[0017] Preferably, a plurality of guide grooves are formed on the limit support plate corresponding to the plurality of limit sleeves so as to limit and guide the sliding path of the limit sleeves.

[0018] In addition, the present invention also provides a special hoisting method for agricultural machinery, comprising the following steps: S1: Adjust the length and height of the support arm by sliding to meet the lifting requirements of different heights, then adjust the relative position between the winch assembly and the equipment to be lifted, and limit the connection of the agricultural machinery to be lifted to the rope loop of the lifting rope in the winch assembly to ensure a firm connection.

[0019] S2: After driving the lifting rope to form multiple groups of rope loops in several limiting sleeves, the relative positions between all the limiting sleeves are controlled by the adjusting end to adjust the position of the lifting rope passed through the limiting sleeves, so that the relative positions of the rope loops are evenly distributed, thereby realizing multi-point lifting of agricultural machinery and ensuring stable operation of the lifting process.

[0020] S3: Start the winch assembly and control the lifting and lowering of the equipment by winding or releasing the lifting rope, so as to drive the agricultural machinery equipment restricted on several rope loops to adjust its height.

[0021] In summary, the present application includes at least one of the following beneficial technical effects: 1. The present invention drives the lifting rope to slide through a number of circumferentially distributed limiting sleeves in sequence, so that the lifting rope forms a rope loop at the limiting sleeve. Through the uniform distribution of multiple rope loops, multi-point limiting lifting of agricultural machinery equipment is achieved, which effectively increases the lifting stability and avoids equipment shaking and deflection.

[0022] 2. The present invention realizes synchronous adjustment of multiple hoisting rope loops that slide through the limiting sleeves through the cooperation between the adjusting rotating rod, the driving gear and a number of correspondingly arranged driven gear plates and the limiting sleeves, so that the rope loops formed by the hoisting rope at the limiting sleeves can adapt to the specifications of the agricultural machinery to be hoisted, thereby ensuring that the equipment always remains in the middle position during the hoisting process to avoid the problem of large shaking.

[0023] 3. The present invention can adaptively adjust the position of the rope loop according to the state of the equipment after hoisting during the hoisting process through the corresponding cooperation between a plurality of adjusting sleeves, limiting sleeves and adjusting springs, automatically adjust the position of the rope loop, ensure that the equipment is always in a balanced state, and further improve the hoisting stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0025] Figure 1 It is a structural schematic diagram of the present invention.

[0026] Figure 2 It is a structural schematic diagram of the winch assembly of the present invention.

[0027] Figure 3 It is a structural schematic diagram of the regulating end of the present invention.

[0028] Figure 4 It is a structural schematic diagram of the pulley of the present invention.

[0029] Figure 5 It is a structural schematic diagram of the limiting sleeve of the present invention.

[0030] Figure 6 It is a structural schematic diagram of the hoisting rope of the present invention.

[0031] Figure 7 The present invention Figure 6 A is an enlarged view of the middle image.

[0032] Figure 8 It is a structural schematic diagram of the adjusting sleeve of the present invention.

[0033] In the figure, 1, base; 10, support arm; 2, winch assembly; 20, reel; 21, lifting rope; 210, rope loop; 22, pulley; 23, adjustment end; 230, limit sleeve; 231, support chassis; 232, adjustment rotating rod; 233, limit support plate; 234, driving gear; 235, driven gear plate; 236, connecting guide block; 237, sliding seat; 24, mounting frame; 240, limit roller; 25, guide slider; 250, guide slot; 26, adjustment sleeve; 260, driven slider; 261, adjustment spring. DETAILED DESCRIPTION

[0034] The following is combined with Figure 1 To Attachment Figure 8 Embodiments of the present invention are described in detail.

[0035] The embodiment of the present application discloses a special lifting machinery and method for agricultural machinery equipment, which explains that the present application is mainly used in the process of lifting agricultural machinery equipment, and realizes the effect of lifting agricultural machinery equipment in terms of technical effect; in particular, during the lifting process, through the cooperation between the lifting rope and a number of limiting sleeves, the effect of synchronous multi-point lifting of the equipment to be lifted is achieved; and, the present application also adaptively adjusts the position of the rope loop according to the state of the equipment after lifting during the lifting process through the corresponding cooperation between a number of adjustment sleeves, limiting sleeves and adjustment springs, thereby ensuring that the equipment is always in a balanced state, thereby further improving the lifting stability.

[0036] Example 1: Reference Figure 1As shown, a special lifting machine for agricultural machinery equipment includes a base 1 and a support arm 10, and a winch assembly 2 for lifting equipment is connected to the support arm 10. It should be noted that the support arm 10 is a telescopic support arm that allows extension and retraction, and a hydraulic rod is also obliquely connected between the base 1 and the support arm 10 for supporting the limit. When in use, adjust the support arm 10 to perform telescopic sliding, and at the same time adjust the relative position between the winch assembly 2 and the equipment to be lifted, and then connect the equipment to be lifted to the winch assembly 2, and start the winch assembly 2 to drive the limited equipment to be raised and lowered, so as to achieve the effect of lifting it.

[0037] Reference Figure 2 and Figure 3 As shown, the hoisting assembly 2 is used for hoisting equipment; specifically, the hoisting assembly 2 includes: The winding drum 20 is limit-connected to a side of the supporting arm 10 close to the base 1, and a hoisting rope 21 is wound around the winding drum for hoisting.

[0038] The pulley 22 is limited at a side of the support arm 10 away from the winding drum 20 , and the hoisting rope 21 is driven by the winding drum 20 to slide and adjust along the pulley 22 .

[0039] The adjusting end 23 is limited on the side of the lifting rope 21 away from the winding drum 20, and is used to adjust and limit the lifting rope 21 after being released from the winding drum 20, so that the lifting rope 21 is limited to multiple sections for lifting agricultural machinery.

[0040] Reference Figures 3 to 5 As shown, the adjustment end 23 includes a plurality of limiting sleeves 230 which are limitedly sleeved on the hoisting rope 21, and a support chassis 231 for limiting and supporting the limiting sleeves 230 is commonly connected between the plurality of limiting sleeves 230. When in use, the hoisting rope 21 is driven to pass through the plurality of limiting sleeves 230, and the length of the hoisting rope 21 after release is limitedly adjusted by the plurality of limiting sleeves 230, so as to be applicable to equipment to be hoisted of different specifications.

[0041] Reference Figures 3 to 6 As shown, the lifting rope 21 is in a double-stranded shape and is limitedly inserted into the limiting sleeve 230 and slides out of the limiting sleeve 230. After the double-strand lifting rope 21 passes through the limiting sleeve 230, a rope loop 210 is formed on one side of the limiting sleeve 230, thereby facilitating the subsequent limited lifting of the agricultural machinery that needs to be lifted.

[0042] Further, refer to Figures 3 to 6As shown, the released hoisting rope 21 on the winding drum 20 is sequentially passed through a plurality of limiting sleeves 230, and then passes through the last limiting sleeve 230 to be connected to the support arm 10, that is, one end of the hoisting rope 21 on the winding drum 20 passes through a plurality of limiting sleeves 230 in sequence and is connected to the support arm 10. When in use, when the hoisting rope 21 is wound or released by driving the winding drum 20 to rotate, the plurality of limiting sleeves 230 passed by the hoisting rope 21 are driven to slide and adjust in the process of increasing or decreasing the length of the hoisting rope 21, thereby adjusting the relative position between the limiting sleeve 230 and the hoisting rope 21, that is, the effect of adjusting the position height of the limiting sleeve 230 and the support chassis 231.

[0043] Reference Figures 3 to 6 As shown, the adjustment end 23 also includes an adjustment rotating rod 232 passing through the middle of the supporting chassis 231, and a limit support plate 233 is connected to the adjustment rotating rod 232 for limiting and guiding the sliding path of all limit sleeves 230. A driving gear 234 is sleeved on the adjustment rotating rod 232, and a plurality of driven gear plates 235 corresponding to the limit sleeves 230 are meshed on the outer side of the driving gear 234, and the driven gear plates 235 and the limit sleeves 230 are connected by a connecting guide block 236.

[0044] When in use, after the hoisting rope 21 passes through the limiting sleeve 230, the rope loop 210 formed is limitedly connected to the agricultural machinery equipment, and the existing technology such as a driving motor drives the adjusting rotating rod 232 to rotate, and the adjusting rotating rod 232 rotates and drives the driving gear 234 to rotate, and the driving gear 234 rotates and drives the driven gear plate 235 meshing with it to slide, and the driven gear plate 235 slides and drives the connected connecting guide block 236 and the limiting sleeve 230 to slide and adjust, and the sliding of the limiting sleeve 230 It drives one section of the lifting rope 21 inserted in the limiting sleeve 230 to slide and adjust, and drives the synchronous sliding between all the limiting sleeves 230 to drive the synchronous adjustment effect of the position of the rope loop 210 of the lifting rope 21 inserted in the limiting sleeve 230, so that after the agricultural machinery equipment is limited and lifted by the rope loop 210 of the lifting rope 21, the lifted agricultural machinery equipment is always kept in the middle of all the rope loops 210 of the lifting rope 21, thereby effectively avoiding the problem of deflection and shaking of the agricultural machinery equipment after being lifted.

[0045] It should be noted that in order to drive all the driven gear plates 235 to perform synchronous sliding adjustment through the driving gear 234, two adjacent driven gear plates 235 are stacked up and down, and at the same time, the positions of two parallel corresponding driven gear plates 235 are at the same height, and all the driven gear plates 235 are distributed circumferentially with the axis of the driving gear 234 as the axis.

[0046] In order to facilitate the limiting and guiding of the sliding path of the driven tooth plates 235 , a plurality of sliding seats 237 are provided on the supporting chassis 231 corresponding to the plurality of driven tooth plates 235 .

[0047] Reference Figures 4 to 7 As shown, a plurality of pulleys 22 are provided corresponding to a plurality of limiting sleeves 230, and the plurality of pulleys 22 and limiting sleeves 230 are evenly distributed circumferentially with the axis of the supporting chassis 231 as the axis. After the end of the lifting rope 21 away from the connected receiving drum 20 slides through all the pulleys 22 and limiting sleeves 230 in sequence, it is limited and divided into a plurality of rope loops 210, and a plurality of rope loops 210 correspond to a plurality of limiting sleeves 230 distributed circumferentially on the supporting chassis 231, thereby achieving the effect of lifting the agricultural machinery equipment at multiple points, and effectively increasing the stability of the equipment during lifting.

[0048] Reference Figure 5 and Figure 6 As shown, the limiting support plate 233 is connected to a mounting frame 24, and the limiting rollers 240 are symmetrically limited on the mounting frame 24, which are used to support and limit the hoisting rope 21 between two adjacent limiting sleeves 230. When in use, the limiting rollers 240 are used to limit and guide the hoisting rope 21 that slides through a plurality of limiting sleeves 230, and the rotation of the limiting rollers 240 greatly reduces the friction between the hoisting rope 21 and the limiting sleeves 230, thereby improving the sliding adjustment efficiency of the hoisting rope 21 between a plurality of limiting sleeves 230.

[0049] Reference Figure 5 and Figure 6 As shown, the limiting sleeve 230 is arranged in a bent shape, and the limiting sleeve 230 is connected to a guide slider 25 which is penetrated on the supporting chassis 231 .

[0050] Reference Figure 5 and Figure 6 As shown, a plurality of guide through grooves 250 are formed on the limiting support plate 233 corresponding to the plurality of limiting sleeves 230 , so as to limit and guide the sliding path of the limiting sleeves 230 .

[0051] Example 2: Reference Figures 5 to 8 As shown, on the basis of Example 1, in the process of hoisting and lifting the agricultural machinery equipment, due to the different sizes and specifications of different agricultural machinery equipment, when the agricultural machinery equipment to be hoisted is limitedly connected to the rope loops 210 on several hoisting ropes 21, it is very likely that the initial height positions of several connections on the agricultural machinery equipment are different. Therefore, in the process of hoisting through several circumferentially distributed rope loops 210, the hoisted equipment is prone to overall skewness, causing the equipment to continuously deflect due to the overall skewness during the hoisting and lifting process, increasing the friction between the equipment and the hoisting rope 21, resulting in increased wear of the hoisting rope 21 and easily leading to safety problems.

[0052] Based on the above, in order to avoid the problem of easy shaking during the lifting process of the equipment, an adjusting sleeve 26 is slidably inserted into the bending section of the limiting sleeve 230, and the rope loop 210 of the lifting rope 21 also slides out of the adjusting sleeve 26. A driven slider 260 is connected to the adjusting sleeve 26, and an adjusting spring 261 is commonly connected between the sliding seat 237 and the driven slider 260.

[0053] In the initial state, the adjusting spring 261 is in a normal extended state to drive the connected driven slider 260 and the adjusting sleeve 26 to slide, so that the adjusting sleeve 26 protrudes from the connected limiting sleeve 230. After the agricultural machinery is limitedly connected to the rope loop 210 on the hoisting rope 21 protruding from the limiting sleeve 230 and the adjusting sleeve 26, at this time, after several rope loops 210 are connected to different places on the agricultural machinery, in the process of driving the agricultural machinery to rise and fall, the hoisting rope 21 is wound up so that several rope loops 210 are tightened. At this time, the tightened rope loop 210 will exert a pressure on the connected adjusting sleeve 26 in the direction close to the middle driving gear 234, so that the adjusting spring 261 is compressed. At this time, since the adjusting spring 261 is compressed, the driven slider 260 and the adjusting sleeve 26 connected to the adjusting spring 261 have a tendency to always slide in the direction away from the middle driving gear 234, that is, the elastic restoring force of the adjusting spring 261 and the pressure exerted on the adjusting sleeve 26 by the lifting rope 21 form a counteracting effect.

[0054] During the process of hoisting the agricultural machinery, if the hoisted agricultural machinery is skewed during the hoisting process, that is, one side of the agricultural machinery is higher and the other side is lower after being hoisted, the pressure applied by the two corresponding rope loops 210 on the supporting chassis 231 to the connected adjusting sleeve 26 will also change accordingly. Specifically, the pressure applied to the adjusting sleeve 26 by the higher side after hoisting is weakened. At this time, driven by the connected adjusting spring 261, the adjusting sleeve 26 is driven to further slide in the direction away from the driving gear 234, and the pressure applied to the adjusting sleeve 26 by the rope loop 210 on the other side that is hoisted lower will further increase. At the same time, the adjusting sleeve 26 further slides in the direction close to the driving gear 234, and drives the corresponding adjusting spring 261 to be further compressed. Through the mutual cooperation between a plurality of rope loops 210 and the corresponding adjusting sleeves 26 and the adjusting spring 261, the relative position between the adjusting sleeve 26 and the corresponding limiting sleeve 230 is adjusted, that is, the corresponding adjustment effect of the force arm between the rope loop 210, the limiting sleeve 230 and the agricultural machinery is achieved, so that the agricultural machinery is always kept in the middle position of all the rope loops 210, and the lifting position of the agricultural machinery during the lifting process is adaptively adjusted to improve the stability during the lifting process.

[0055] In addition, the present invention also provides a special hoisting method for agricultural machinery, comprising the following steps: S1: Adjust the length and height of the support arm 10 by sliding to meet the lifting requirements of different heights, then adjust the relative position between the winch assembly 2 and the equipment to be lifted, and limit the connection of the agricultural machinery to be lifted to the rope loop 210 of the lifting rope 21 in the winch assembly 2 to ensure a firm connection.

[0056] S2: After driving the lifting rope 21 to form multiple groups of rope loops 210 in a number of limiting sleeves 230, the relative positions of all the limiting sleeves 230 are controlled by the adjusting end 23, so as to adjust the position of the lifting rope 21 passed through the limiting sleeves 230, so that the relative positions of the rope loops 210 are evenly distributed, thereby realizing multi-point lifting of agricultural machinery and ensuring stable operation of the lifting process.

[0057] S3: Start the winch assembly 2, and control the lifting and lowering of the equipment by winding or releasing the hoisting rope 21, so as to drive the agricultural machinery equipment limited on the rope loops 210 to adjust its height.

[0058] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered as exemplary and non-restrictive in all respects.

[0059] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A special lifting machine for agricultural machinery, comprising a base (1) and a support arm (10), characterized in that: The support arm (10) is connected to a hoisting assembly (2) for hoisting equipment, wherein the hoisting assembly (2) comprises: A winding drum (20) is limit-connected to a side of the support arm (10) close to the base (1), and a lifting rope (21) is wound around the winding drum for lifting; The pulley (22) is limited at a side of the support arm (10) away from the winding drum (20), and the hoisting rope (21) is driven by the winding drum (20) to slide along the pulley (22) for adjustment; The adjustment end (23) is limited at a side of the lifting rope (21) away from the winding drum (20) and is used to adjust and limit the lifting rope (21) after being released from the winding drum (20), so that the lifting rope (21) is limited to multiple sections for lifting agricultural machinery.

2. The agricultural machinery hoisting machine according to claim 1, characterized in that: The adjusting end (23) comprises a plurality of limiting sleeves (230) which are limitedly sleeved on the lifting rope (21); the plurality of limiting sleeves (230) are commonly connected to a supporting chassis (231) for providing limited support for the limiting sleeves (230).

3. The agricultural machinery hoisting machine according to claim 2, characterized in that: The lifting rope (21) is in the form of two strands, is limitedly inserted into the limiting sleeve (230), and slides out of the limiting sleeve (230).

4. The agricultural machinery hoisting machine according to claim 2, characterized in that: The lifting rope (21) released from the winding drum (20) is passed through a plurality of limiting sleeves (230) in sequence, and then passes through the last limiting sleeve (230) to be connected to the support arm (10).

5. The agricultural machinery hoisting machine according to claim 2, characterized in that: The adjusting end (23) further comprises an adjusting rotating rod (232) passing through the middle of the supporting chassis (231); a limiting support plate (233) for limiting and guiding the sliding paths of all limiting sleeves (230) is connected to the adjusting rotating rod (232); a driving gear (234) is sleeved on the adjusting rotating rod (232); a plurality of driven tooth plates (235) corresponding to the limiting sleeves (230) are meshed on the outer side of the driving gear (234); and the driven tooth plates (235) and the limiting sleeves (230) are connected via a connecting guide block (236).

6. The agricultural machinery hoisting machine according to claim 2, characterized in that: A plurality of the pulleys (22) are provided corresponding to the plurality of limiting sleeves (230), and the plurality of pulleys (22) and the limiting sleeves (230) are evenly distributed in the circumferential direction with the axis of the supporting chassis (231) as the axis.

7. The agricultural machinery hoisting machine according to claim 5, characterized in that: The limiting support plate (233) is connected to a mounting frame (24), and the mounting frame (24) is provided with symmetrical limiting rollers (240) for supporting and limiting the hoisting rope (21) between two adjacent limiting sleeves (230).

8. The agricultural machinery hoisting machine according to claim 2, characterized in that: The limiting sleeve (230) is arranged in a bent shape, and a guide slider (25) which is inserted through the supporting chassis (231) is connected to the limiting sleeve (230).

9. The agricultural machinery hoisting machine according to claim 5, characterized in that: A plurality of guide through grooves (250) are formed on the limit support plate (233) corresponding to the plurality of limit sleeves (230) so as to limit and guide the sliding path of the limit sleeves (230).

10. A method for hoisting agricultural machinery, using a hoisting machine for agricultural machinery as claimed in any one of claims 1 to 9, characterized in that: The lifting method includes the following steps: S1: adjusting the length and height of the support arm (10) by sliding to meet the requirements of hoisting at different heights, then adjusting the relative position between the hoisting assembly (2) and the equipment to be hoisted, and limiting the connection of the agricultural machinery to be hoisted to the rope loop (210) of the hoisting rope (21) in the hoisting assembly (2) to ensure a firm connection; S2: After driving the hoisting rope (21) to form a plurality of rope loops (210) in a plurality of limiting sleeves (230), the relative positions between all limiting sleeves (230) are controlled by the adjusting end (23), so as to adjust the position of the hoisting rope (21) passing through the limiting sleeves (230), so that the relative positions between the rope loops (210) are evenly distributed, thereby achieving multi-point hoisting of agricultural machinery and equipment, and ensuring stable operation of the hoisting process; S3: starting the winch assembly (2) to control the lifting and lowering of the equipment by winding or releasing the lifting rope (21), so as to drive the agricultural machinery restricted on the plurality of rope loops (210) to adjust its height.

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