A control method for a lifting device

Abstract

The application provides a control method of a lifting device, through a vertical first stroke of an inner side telescopic shaft driven by a cylinder shaft of a limiting cylinder in a limiting assembly to make the top of the telescopic shaft flush with the top of a corresponding side of a material, and through a vertical second stroke of the inner side telescopic shaft driven by the cylinder shaft of the limiting cylinder in the limiting assembly to make the top of the telescopic shaft higher than the top of the corresponding side of the material and have a safety interval, so that when the limiting assembly provides a limiting action for internal material, the top height of the telescopic shaft in the limiting assembly can be always higher than the top height of the material, the internal material is completely wrapped and a stable and effective limiting action is realized, the possibility of unexpected material falling is reduced, the possibility of slag falling caused by the contact between the telescopic shaft and the material in the lifting process is reduced, the lifting effect of the material is stable, and the damage to the lifting environment is reduced as much as possible.

Description

Technical Field

[0001] This invention relates to the technical field of lifting device control technology, and specifically to a control method for a lifting device. Background Technology

[0002] A lifting device is a device that places materials on top of itself and lifts them to a preset height position through limiting and clamping operations.

[0003] The following defects and shortcomings still exist during the operation of the lifting device:

[0004] 1) The limiting effect on the inner material is not perfect. It is impossible to achieve an effective and stable limiting effect on the inner material during clamping and lifting. This makes it possible for the material at the top of the lifting device to come out unexpectedly and for material fragments to fall off. This not only affects the lifting effect of the material itself, but also damages the lifting environment.

[0005] 2) It is difficult to achieve a stable clamping effect on the lifted material. If the clamping component clamps the internal material too loosely, it will cause the material to sway left and right during the lifting process, resulting in risks such as eccentricity and loosening. If the clamping component clamps the internal material too tightly, it will damage the clamping component and the appearance of the material, reduce the service life of the clamping component, and affect the subsequent processing quality of the material.

[0006] 3) The inability to predict the safety and stability during the overall lifting process poses a safety threat while reducing lifting efficiency and stability.

[0007] Therefore, there is an urgent need to provide a control method for a lifting device to solve the defects and shortcomings of the existing technology. Summary of the Invention

[0008] In order to overcome the defects and shortcomings of the existing technology, the present invention provides a control method for a lifting device.

[0009] The specific solution provided by this invention is as follows:

[0010] A method for controlling a lifting device, characterized by comprising the following steps:

[0011] S1: Place the material to be lifted at the center of the top of the bottom shaft of the lifting device, and ensure that the outer protective sleeve of the bottom shaft has been squeezed and deformed at this time;

[0012] S2: Move the material by the bottom rotating shaft until it is at the preset axial position of the lifting device on the material, and then lock the bottom rotating shaft so that it cannot rotate.

[0013] S3: Detect the material size and determine the relationship between the material size and the limit component:

[0014] The limit switch component is activated when the activation conditions are met.

[0015] An alert will be sent to the user when the activation conditions are not met.

[0016] S4: The cylinder shaft of the limit cylinder in the limit assembly drives the inner telescopic shaft to extend vertically for the first stroke, so that the top of the telescopic shaft is flush with the top of the corresponding side of the material.

[0017] S5: The cylinder shaft of the limit cylinder in the limit assembly drives the inner telescopic shaft to extend upward for a second vertical stroke, so that the top of the telescopic shaft is higher than the top of the corresponding side of the material and there is a safe distance.

[0018] S6: Start the clamping assembly. The cylinder of the clamping cylinder in the clamping assembly retracts downward, driving the clamping sliders on both sides of the top to move towards each other in the first horizontal stroke, so that the outer protective sleeves of the telescopic shafts on both sides come into contact with the material but do not squeeze or deform it.

[0019] S7: The cylinder shaft of the clamping cylinder in the clamping assembly continues to retract downward, driving the clamping sliders on both sides of the top to move towards each other in the second horizontal stroke, so that the outer protective sleeves of the telescopic shafts on both sides are squeezed and deformed by the material.

[0020] S8: Controls and locks the telescopic shafts on both sides to prevent them from rotating;

[0021] S9: The material is lifted to the preset target height by driving the top and bottom rotating shafts through the electric cylinder shaft in the lifting assembly;

[0022] S10: Reverse start clamping assembly, the cylinder of the clamping cylinder in the clamping assembly extends upward through the cylinder axis, driving the clamping sliders on both sides of the top to move apart, so that the outer protective sleeves of the telescopic shafts on both sides are separated from the material.

[0023] S11: Reverse start limit assembly, the cylinder shaft of the limit cylinder in the limit assembly drives the inner telescopic shaft to retract downward, so that the top of the telescopic shaft is lower than the top of the bottom rotating shaft, so as to facilitate the removal of the top material.

[0024] In a further preferred embodiment of the present invention, the opening condition in step S3 includes:

[0025] 1) The material height is within the limit height travel range of the limit component, and the material height is less than 2 / 3 of the maximum limit height of the limit component;

[0026] 2) The width of the material is within the travel range of the limiting width of the limiting component, and the sum of the distances between the material and the limiting components on both sides is greater than 1 / 2 of the maximum value of the limiting width of the limiting component.

[0027] As a further preferred embodiment of the present invention, in steps S4-S5,

[0028] 1) When the height of the material is equal on both sides, the upward stroke of the telescopic shafts on both sides is the same, and the upward speed is the same;

[0029] 2) When the heights on both sides of the material are unequal, the upward stroke of the telescopic shaft on the higher side is greater than that on the lower side, and the upward speed of the telescopic shaft on the higher side is greater than that on the lower side.

[0030] As a further preferred embodiment of the present invention, steps S4-S5 satisfy the following:

[0031] The first vertical stroke is greater than the second vertical stroke; and

[0032] During the first vertical stroke, the upward speed of the telescopic shafts on both sides is greater than that during the second vertical stroke.

[0033] As a further preferred embodiment of the present invention, steps S5-S6 satisfy the following:

[0034] The first horizontal stroke is greater than the second horizontal stroke; and

[0035] During the first horizontal stroke, the speed at which the sliders on both sides move towards each other is greater than the speed at which the sliders on both sides move towards each other during the second horizontal stroke.

[0036] As a further preferred embodiment of the present invention, step S9 includes the following steps:

[0037] S9.1: The material is lifted to the first preset height by driving the top and bottom rotating shafts through the electric cylinder shaft in the lifting assembly, and the lifting parameters in this process are judged. When the lifting conditions are met, the next step is carried out.

[0038] S9.2: The material is lifted to the preset target height by driving the top and bottom rotating shafts through the electric cylinder shaft in the lifting assembly;

[0039] And it satisfies the condition that the first preset height is less than the preset target height.

[0040] As a further preferred embodiment of the present invention, in step S9.1, the lifting parameters in the process of lifting the material to the first preset height include at least: material position parameters, casing parameters, and environmental parameters.

[0041] As a further preferred embodiment of the present invention, in step S9.1, the lifting conditions during the process of lifting the material to the first preset height include at least the following:

[0042] 1) The material's height, horizontal position, and front-to-back position remained unchanged;

[0043] 2) The compression condition of the outer casing of the bottom rotating shaft and the outer casings of the telescopic shafts on both sides remained unchanged;

[0044] 3) No abnormal noises were produced.

[0045] As a further preferred embodiment of the present invention, in steps S9.1 to S9.2, the lifting speed during the process of lifting the material to the first preset height is less than the lifting speed during the process of lifting the material to the preset target height.

[0046] As a further preferred embodiment of the present invention, in step S10, when the outer sleeves of the two telescopic shafts are no longer in contact with the material, the two telescopic shafts are controlled to rotate for a preset time.

[0047] Compared with existing technologies, the technical effects that this invention can achieve include:

[0048] 1) This invention provides a control method for a lifting device. The method involves using the cylinder shaft of the limiting cylinder in the limiting assembly to drive the inner telescopic shaft upwards for a first vertical stroke, so that the top of the telescopic shaft is flush with the top of the material on the corresponding side. Then, the method further involves using the cylinder shaft of the limiting cylinder in the limiting assembly to drive the inner telescopic shaft upwards for a second vertical stroke, so that the top of the telescopic shaft is higher than the top of the material on the corresponding side while maintaining a safe distance. This ensures that when the limiting assembly provides a limiting effect for the internal material, the top height of the telescopic shaft in the limiting assembly is always higher than the top height of the material. This achieves complete and stable limiting of the internal material, reducing the possibility of unexpected material detachment and minimizing the possibility of debris falling due to contact between the telescopic shaft and the material during lifting. Furthermore, even if debris is generated during the process, it can be confined to the top of the lifting device as much as possible, ensuring stable lifting of the material itself while minimizing damage to the lifting environment.

[0049] 2) This invention provides a control method for a lifting device. The clamping cylinder in the clamping assembly retracts downwards, causing the clamping sliders on both sides of the top to move in opposite directions for a first horizontal stroke. This allows the outer protective sleeves of the telescopic shafts on both sides to contact the material without being squeezed or deformed. The clamping cylinder continues to retract downwards, causing the clamping sliders on both sides to move in opposite directions for a second horizontal stroke. This causes the outer protective sleeves of the telescopic shafts on both sides to squeeze and deform against the material, effectively ensuring a stable clamping effect on the material to be lifted. The first horizontal stroke of the clamping sliders on both sides ensures that the clamping assembly contacts the material but does not clamp it. The second horizontal stroke of the clamping sliders on both sides then clamps the material in place. This ensures stable clamping of the material while minimizing damage to the clamping assembly and the appearance of the material.

[0050] 3) This invention provides a control method for a feeding device, which uses the electric cylinder shaft of the electric cylinder in the lifting assembly to drive the top and bottom rotating shafts to lift the material to a first preset height, and judges the lifting parameters during the process. When the lifting conditions are met, the next step is performed; and the electric cylinder shaft of the electric cylinder in the lifting assembly drives the top and bottom rotating shafts to lift the material to a preset target height. In the lifting process, a test lifting stroke is set to rise to the first preset height, so as to predict the subsequent stable lifting stroke, and to determine whether the material position parameters, casing parameters and environmental parameters will change unexpectedly during the process. This allows for advance prediction of the subsequent stable lifting stroke, so as to effectively ensure the lifting efficiency and stability of the lifting process. Attached Figure Description

[0051] Figure 1 A flowchart illustrating the steps of the control method provided by this invention.

[0052] Figure 2 This is a perspective view of the front structure of the lifting device provided by the present invention.

[0053] Figure 3 This is a rear view of the lifting device provided by the present invention. Detailed Implementation

[0054] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0055] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for 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 invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0056] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0057] [First Embodiment]

[0058] like Figure 1-3 The diagram illustrates a control method for a lifting device according to a first embodiment of the present invention, comprising the following steps:

[0059] S1: Place the material to be lifted at the top center of the bottom rotating shaft (not shown) of the lifting device, and ensure that the outer protective sleeve 1 of the bottom rotating shaft has been squeezed and deformed at this time. This ensures that the material to be lifted is located at the center of the top of the bottom rotating shaft, so as to facilitate the uniform clamping effect of the clamping components on both sides. Ensuring that the outer protective sleeve of the bottom rotating shaft has been squeezed and deformed can ensure that the material to be lifted is supported evenly and stably at the top of the bottom rotating shaft. In this embodiment, the material to be lifted is a long hollow square tube with a uniform mass distribution along the axial direction. Those skilled in the art can also select other materials for the material to be lifted according to actual usage requirements.

[0060] S2: The material is moved by the bottom rotating shaft until it is in the preset axial position of the lifting device, so that the lifting device can be evenly distributed in the axial direction of the material. Then the bottom rotating shaft is locked to prevent it from rotating, so as to avoid the adverse effects that may be caused by the unexpected rotation of the casing around the bottom rotating shaft during subsequent limiting, clamping and lifting processes.

[0061] S3: Detect the material size and determine the relationship between the material size and the limit component: when the opening conditions are met, open the limit component; when the opening conditions are not met, issue an alarm to the user.

[0062] In this embodiment, the activation conditions include:

[0063] 1) The material height is within the limit height stroke range of the limiting component, and the material height is less than 2 / 3 of the maximum limit height of the limiting component; this setting allows the top height of the telescopic shaft in the limiting component to always be higher than the top height of the material. While achieving complete coverage and stable and effective limiting of the internal material, it reduces the possibility of the material unexpectedly falling out. It also reduces the possibility of debris falling due to contact between the telescopic shaft and the material during the lifting process. In addition, even if debris is generated during the process, it can be confined to the top of the lifting device as much as possible, ensuring the stability of the material lifting effect while minimizing damage to the lifting environment.

[0064] 2) The material width is within the limit width stroke range of the limiting component, and the sum of the distances between the material and the two limit components is greater than 1 / 2 of the maximum limit width of the limiting component. This setting provides movement space for the subsequent horizontal first and second strokes of the two clamping sliders moving towards each other, so as to ensure that the clamping component and the material are clamped in place and stably, while minimizing damage to the appearance of the clamping component and the material.

[0065] S4: The cylinder shaft 22 of the limiting cylinder 21 in the limiting component 2 drives the inner telescopic shaft (not shown, it can extend and retract while also rotating by the top motor) to extend upward for the first vertical stroke, so that the top of the telescopic shaft is flush with the top of the material on the corresponding side.

[0066] S5: The cylinder shaft 22 of the limiting cylinder 21 in the limiting component 2 drives the inner telescopic shaft to extend upward for a second vertical stroke, so that the top of the telescopic shaft is higher than the top of the corresponding side of the material and there is a safe distance.

[0067] This allows the limiting component to ensure that the top height of the telescopic shaft in the limiting component is always higher than the top height of the material when providing a limiting effect for the internal material. While achieving a complete and stable limiting effect for the internal material, it reduces the possibility of the material unexpectedly falling out. It also reduces the possibility of debris falling due to contact between the telescopic shaft and the material during the lifting process. In addition, even if debris is generated during the process, it can be confined to the top of the lifting device as much as possible, ensuring the stability of the material lifting effect while minimizing damage to the lifting environment.

[0068] And it satisfies:

[0069] The vertical first stroke is longer than the vertical second stroke. This is because the vertical first stroke is often equal to the height of the material, while the vertical second stroke is used to enhance the limiting effect of the limiting component. It does not need too much stroke to avoid wasting the limiting space. At the same time, an excessively large vertical stroke will also have an adverse effect on the limiting stability of the limiting component.

[0070] The upward speed of the telescopic shafts on both sides during the first vertical stroke is greater than that during the second vertical stroke. Since the second vertical stroke is shorter than the first vertical stroke, the slower upward speed is more conducive to the movement of the second vertical stroke. At the same time, the slower upward speed also helps to reduce the adverse effects such as shaking and displacement that may be caused to the material on the bottom rotating shaft.

[0071] Preferably, in steps S4-S5

[0072] 1) When the height of the material is equal on both sides, the upward stroke and upward speed of the telescopic shafts on both sides are the same, so as to achieve the effect of uniform limiting on both sides.

[0073] 2) When the heights of the two sides of the material are not equal, the upward stroke of the telescopic shaft on the higher side is greater than that on the lower side, and the upward speed of the telescopic shaft on the higher side is greater than that on the lower side, so that the telescopic shafts on both sides can reach the top limit position at the same time, improve work efficiency, and facilitate the opening action of the subsequent clamping components.

[0074] S6: Start the clamping assembly 3. The cylinder shaft 32 of the clamping cylinder 31 in the clamping assembly 3 retracts downward, driving the clamping sliders 33 on both sides of the top to move towards each other in the first horizontal stroke, so that the outer protective sleeves 34 of the telescopic shafts on both sides come into contact with the material but do not squeeze or deform it.

[0075] S7: The cylinder shaft 32 of the clamping cylinder 31 in the clamping assembly 3 continues to retract downward, driving the clamping sliders 33 on both sides of the top to move towards each other in a second horizontal stroke, so that the outer protective sleeves 34 of the telescopic shafts on both sides are squeezed and deformed by the material.

[0076] This effectively ensures a stable clamping effect on the material to be lifted. The clamping components come into contact with the material in the first horizontal stroke by the opposing movement of the two clamping sliders, but do not clamp it. Then, the clamping components are clamped to the material in the second horizontal stroke by the opposing movement of the two clamping sliders. This ensures stable clamping of the material while minimizing damage to the clamping components and the appearance of the material.

[0077] Preferably, in this step,

[0078] The first horizontal stroke is greater than the second horizontal stroke. The first horizontal stroke allows the clamping component to contact the material but does not clamp it, while the second horizontal stroke clamps the material so that the outer sleeve of the telescopic shaft on both sides is squeezed and deformed. Therefore, the first horizontal stroke needs to be set much greater than the second horizontal stroke.

[0079] In the first horizontal stroke, the speed at which the two clamping sliders move towards each other is greater than the speed at which they move towards each other in the second horizontal stroke. Since the first horizontal stroke is longer than the second horizontal stroke, it is necessary to set the speed at which the two clamping sliders move towards each other in the first horizontal stroke to be greater than the speed at which they move towards each other in the second horizontal stroke. At the same time, the second horizontal stroke clamps the clamping components and the material into place, so that the outer sleeves of the two telescopic shafts are squeezed and deformed. The smaller the speed at which the two clamping sliders move towards each other, the more stable the deformation tends to be. In addition, the smaller the speed at which the two clamping sliders move towards each other, the less likely it is to cause material fragments to fall off due to contact between the clamping components and the material.

[0080] S8: Control and lock the telescopic shafts on both sides to prevent them from rotating, so as to avoid the adverse effects that may be caused by the unexpected rotation of the casing around the telescopic shafts on both sides during subsequent lifting.

[0081] S9: The material is lifted to the preset target height by the electric cylinder shaft 42 of the electric cylinder 41 in the lifting assembly 4, which drives the top and bottom rotating shafts; including the following steps:

[0082] S9.1: The material is lifted to a first preset height by driving the top and bottom rotating shafts through the electric cylinder shaft in the lifting assembly, and the lifting parameters during this process are judged. When the lifting conditions are met, the next step is performed. In this embodiment, the lifting parameters during the process of lifting the material to the first preset height include at least: material position parameters, protective cylinder parameters, and environmental parameters. Among them, the material position parameters include the material's height, horizontal and front-back positions, and the protective cylinder parameters include the compression status of the protective cylinder outside the bottom rotating shaft and the protective cylinders outside the two side telescopic shafts. The positional stability and clamping stability of the material during the lifting process are determined by the material position and the protective cylinder compression status, respectively. The environmental parameters include at least abnormal noises, which can help to judge the positional stability and clamping stability of the material during the lifting process.

[0083] Therefore, correspondingly, the lifting conditions in the process of lifting the material to the first preset height include at least the following:

[0084] 1) The material's height, horizontal position, and front-to-back position remained unchanged;

[0085] 2) The compression condition of the outer casing of the bottom rotating shaft and the outer casings of the telescopic shafts on both sides remained unchanged;

[0086] 3) No abnormal noises were produced.

[0087] S9.2: The material is lifted to the preset target height by driving the top and bottom rotating shafts through the electric cylinder shaft in the lifting assembly;

[0088] And it satisfies the condition that the first preset height is less than the preset target height;

[0089] Therefore, during the lifting process, a test lifting stroke is set to rise to the first preset height. This allows for the prediction of the subsequent stable lifting stroke, determining whether unexpected changes occur in material position parameters, casing parameters, and environmental parameters during this process. This advance prediction of the subsequent stable lifting stroke effectively ensures the lifting efficiency and stability of the lifting process.

[0090] As a further preferred embodiment, the lifting speed during the process of lifting the material to the first preset height is less than the lifting speed during the process of lifting the material to the preset target height. While corresponding to the first preset height being less than the preset target height, this also helps to ensure the stability of the longer stable lifting process through a shorter test stroke.

[0091] S10: Reverse start clamping assembly. The cylinder of the clamping cylinder in the clamping assembly extends upward, causing the clamping sliders on both sides of the top to move apart, so that the outer protective sleeves of the two telescopic shafts on both sides are separated from the material. When the outer protective sleeves of the two telescopic shafts on both sides are separated from the material, the two telescopic shafts are controlled to rotate for a preset time. On the one hand, the material debris adhering to the outer protective sleeves of the two telescopic shafts on both sides can be removed in this way. On the other hand, it can also check whether the two telescopic shafts on both sides are damaged unexpectedly before and after the clamping process.

[0092] S11: Reverse start limit assembly, the cylinder shaft of the limit cylinder in the limit assembly drives the inner telescopic shaft to retract downward, so that the top of the telescopic shaft is lower than the top of the bottom rotating shaft, so as to facilitate the removal of the top material.

[0093] It is worth noting that the protective sleeves mentioned in this embodiment are all made of elastic and deformable material and are fixed to the outer periphery of the corresponding rotating shaft.

[0094] It will be apparent 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 invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A control method for a lifting device, characterized in that: Includes the following steps: S1: Place the material to be lifted at the center of the top of the bottom shaft of the lifting device, and ensure that the outer protective sleeve of the bottom shaft has been squeezed and deformed at this time; S2: Move the material by the bottom rotating shaft until the material is at the preset axial position of the lifting device, and then lock the bottom rotating shaft so that it cannot rotate. S3: Detect the material size and determine the relationship between the material size and the limit component: The limit switch component is activated when the activation conditions are met. An alert will be sent to the user when the activation conditions are not met. S4: The cylinder shaft of the limit cylinder in the limit assembly drives the inner telescopic shaft to extend vertically for the first stroke, so that the top of the telescopic shaft is flush with the top of the corresponding side of the material. S5: The cylinder shaft of the limit cylinder in the limit assembly drives the inner telescopic shaft to extend upward for a second vertical stroke, so that the top of the telescopic shaft is higher than the top of the corresponding side of the material and there is a safe distance. S6: Start the clamping assembly. The cylinder of the clamping cylinder in the clamping assembly retracts downward, driving the clamping sliders on both sides of the top to move towards each other in the first horizontal stroke, so that the outer protective sleeves of the telescopic shafts on both sides come into contact with the material but do not squeeze or deform it. S7: The cylinder shaft of the clamping cylinder in the clamping assembly continues to retract downward, driving the clamping sliders on both sides of the top to move towards each other in the second horizontal stroke, so that the outer protective sleeves of the telescopic shafts on both sides are squeezed and deformed by the material. S8: Controls and locks the telescopic shafts on both sides to prevent them from rotating; S9: The material is lifted to the preset target height by driving the top and bottom rotating shafts through the electric cylinder shaft in the lifting assembly; S10: Reverse start clamping assembly, the cylinder of the clamping cylinder in the clamping assembly extends upward through the cylinder axis, driving the clamping sliders on both sides of the top to move apart, so that the outer protective sleeves of the telescopic shafts on both sides are separated from the material. S11: Reverse start limit assembly, the cylinder shaft of the limit cylinder in the limit assembly drives the inner telescopic shaft to retract downward, so that the top of the telescopic shaft is lower than the top of the bottom rotating shaft, so as to facilitate the removal of the top material; In step S3, the activation conditions include: 1) The material height is within the limit height travel range of the limit component, and the material height is less than 2 / 3 of the maximum limit height of the limit component; 2) The width of the material is within the travel range of the limiting width of the limiting component, and the sum of the distances between the material and the limiting components on both sides is greater than 1 / 2 of the maximum value of the limiting width of the limiting component. In steps S4-S5 1) When the height of the material is equal on both sides, the upward stroke of the telescopic shafts on both sides is the same, and the upward speed is the same; 2) When the heights on both sides of the material are unequal, the upward stroke of the telescopic shaft on the higher side is greater than that on the lower side, and the upward speed of the telescopic shaft on the higher side is greater than that on the lower side. In steps S4-S5, the following conditions are met: The first vertical stroke is greater than the second vertical stroke; and The upward speed of the telescopic shafts on both sides during the first vertical stroke is greater than the upward speed of the telescopic shafts on both sides during the second vertical stroke. In steps S6-S7, the following conditions are met: The first horizontal stroke is greater than the second horizontal stroke; and During the first horizontal stroke, the speed at which the sliders on both sides move towards each other is greater than the speed at which the sliders on both sides move towards each other during the second horizontal stroke.

2. The control method for a lifting device according to claim 1, characterized in that: Step S9 includes the following steps: S9.1: The material is lifted to the first preset height by driving the top and bottom rotating shafts through the electric cylinder shaft in the lifting assembly, and the lifting parameters in this process are judged. When the lifting conditions are met, the next step is carried out. S9.2: The material is lifted to the preset target height by driving the top and bottom rotating shafts through the electric cylinder shaft in the lifting assembly; And it satisfies the condition that the first preset height is less than the preset target height.

3. The control method for a lifting device according to claim 2, characterized in that: In step S9.1, the lifting parameters during the process of lifting the material to the first preset height include at least: material position parameters, casing parameters, and environmental parameters.

4. The control method for a lifting device according to claim 2, characterized in that: In step S9.1, the lifting conditions during the process of lifting the material to the first preset height include at least the following: 1) The material's height, horizontal position, and front-to-back position remained unchanged; 2) The compression condition of the outer casing of the bottom rotating shaft and the outer casings of the telescopic shafts on both sides remained unchanged; 3) No abnormal noises were produced.

5. The control method for a lifting device according to claim 2, characterized in that: In steps S9.1 to S9.2, the lifting speed during the process of lifting the material to the first preset height is less than the lifting speed during the process of lifting the material to the preset target height.

6. The control method for a lifting device according to claim 1, characterized in that: In step S10, when the outer sleeves of the two telescopic shafts are no longer in contact with the material, the two telescopic shafts are controlled to rotate for a preset time.

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