WO2024119650A1

WO2024119650A1 - Driving cylinder and control method therefor

Info

Publication number: WO2024119650A1
Application number: PCT/CN2023/081092
Authority: WO
Inventors: 马中伟; 徐超; 何小强
Original assignee: 娄底市中兴液压件有限公司
Priority date: 2022-12-09
Filing date: 2023-03-13
Publication date: 2024-06-13
Also published as: CN115841904A

Abstract

The present application relates to the technical field of power transmission. Provided are a driving cylinder, a power transmission system, and a working machine, wherein the driving cylinder comprises a cylinder body, a piston assembly, a magnet drive assembly and a control device; the piston assembly is slidably connected to the cylinder body; the magnet drive assembly is mounted between the cylinder body and the piston assembly; the magnet drive assembly can provide a magnetic driving force for the piston assembly; the control device is connected to the magnet drive assembly; and the control device can control the direction of magnetic pole of the magnet drive assembly, so as to adjust the direction of the magnetic driving force of the magnet drive assembly, causing the piston assembly to perform telescoping movement or reverse buffering. By means of this structural arrangement, the magnet drive assembly is arranged between the cylinder body and the piston assembly. By controlling the arrangement direction of magnetic pole of the magnet drive assembly, the control device can drive the piston assembly to perform telescoping movement along the cylinder body or to perform reverse buffering on the piston assembly. In this way, the driving cylinder has a relatively simple structure; and the need to independently provide a mechanical braking device is eliminated, and the cost is relatively low.

Description

Driving cylinder and control method thereof

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to Chinese patent application No. 202211585000.3, filed on December 9, 2022, and entitled “Driving cylinder and control method thereof”, which is incorporated herein by reference in its entirety.

Technical Field

The present application relates to the field of power transmission technology, and in particular to a driving cylinder and a control method thereof.

Background technique

The drive cylinder is a commonly used power actuator in the machinery industry. Common types of drive cylinders include hydraulic cylinders and electric cylinders. Among them, hydraulic cylinders have the disadvantages of oil leakage and poor control accuracy. Most of the existing technologies use electric cylinders to replace hydraulic cylinders. However, the structure of the electric cylinder is relatively complex, and a mechanical buffer device needs to be set in the cylinder body, which is costly.

Summary of the invention

The present application provides a driving cylinder and a control method thereof, which are used to solve or improve the problem that the existing electric cylinder has a complex structure and requires an independent mechanical buffer device, resulting in high costs.

According to a first aspect of the present application, a drive cylinder is provided, comprising a cylinder body, a piston assembly, a magnet drive assembly and a control device.

Among them, the piston assembly is slidably connected to the cylinder body, the magnet drive assembly group is installed between the cylinder body and the piston assembly, the magnet drive assembly can provide a magnetic driving force for the piston assembly, the control device is connected to the magnet drive assembly, and the control device can control the magnetic pole direction of the magnet drive assembly to adjust the direction of the magnetic driving force of the magnet drive assembly, so as to make the piston assembly telescopic, movable or reverse buffered.

According to a driving cylinder provided by the present application, the magnet driving assembly includes a first permanent magnet, a second permanent magnet and an electromagnet.

Wherein, the first permanent magnet is mounted on one end of the cylinder body. The second permanent magnet is mounted on the other end of the cylinder body. The electromagnet is mounted on the piston assembly. The magnetic poles of the permanent magnet are arranged to face the magnetic poles of the second permanent magnet.

According to a driving cylinder provided by the present application, the piston assembly includes a piston and a piston rod. The piston is slidably mounted in the cylinder body. One end of the piston rod is connected to the piston, and the other end of the piston rod passes through the cylinder body and extends to the outside of the cylinder body.

The electromagnet is connected to the piston. The piston rod includes a wire passing cavity. The current-carrying wire of the electromagnet passes through the wire passing cavity and extends to the outside of the cylinder body.

According to a driving cylinder provided in the present application, the control device is electrically connected to the electromagnet, and the control device is used to control the flow size and flow direction of the electromagnet.

According to a driving cylinder provided by the present application, the driving cylinder further includes a distance sensor. The distance sensor is used to detect the distance between the end of the cylinder body and the piston. The control device is electrically connected to the distance sensor. The control device is used to control the flow size and flow direction of the electromagnet based on the detection result of the distance sensor.

According to a driving cylinder provided by the present application, the driving cylinder further comprises a brake member, the brake member is connected to the piston, and the brake member can be switched between a braking position and a brake release position.

In the braking position, the braking member presses against the inner wall of the cylinder body to achieve friction braking; in the braking release position, the braking member separates from the inner wall of the cylinder body to release friction braking.

According to a driving cylinder provided in the present application, the braking component includes a brake pad, a braking driving spring and a braking release driving component.

Wherein, the brake drive spring is connected to the brake pad. The brake pad is adapted to the inner side wall of the cylinder. The brake drive spring can drive the brake pad to fit and press against the inner side wall of the cylinder, so that the brake member is switched to the brake position. The brake release drive member is connected to the brake pad, and the brake release drive member can drive the brake pad to overcome the elastic force of the brake drive spring and separate from the inner side wall of the cylinder, so that the brake member is switched to the brake release position.

According to a driving cylinder provided by the present application, the driving cylinder further includes an insulation detection member. The insulation detection member is used to detect the insulation of the electromagnet power supply circuit. The control device is electrically connected to the insulation detection member. The control device is used to control the current flow state of the electromagnet based on the detection result of the insulation detection member.

According to a second aspect of the present application, a control method for a driving cylinder is provided, comprising:

determining a target motion of a piston assembly of a drive cylinder;

The control device controls the magnetic pole direction of the magnet drive assembly to extend or retract the piston assembly relative to the cylinder body;

When the piston assembly moves to a position close to the end of the cylinder body, the control device controls the magnetic poles of the magnet drive assembly to be arranged in reverse order to achieve reverse buffering of the piston rod assembly.

According to a control method for a drive cylinder provided in the present application, the control device controls the magnetic pole direction of the magnet drive assembly to extend or retract the piston assembly relative to the cylinder body, the steps comprising:

When the piston assembly of the drive cylinder performs a contraction action, the control device controls the flow direction of the electromagnet so that the direction of the magnetic pole of the electromagnet is the same as that of the first permanent magnet at the first end of the cylinder body and the direction of the magnetic pole of the second permanent magnet at the second end of the cylinder body is opposite;

When the piston assembly of the drive cylinder is extended, the control device controls the flow direction of the electromagnet so that the direction of the magnetic pole of the electromagnet is opposite to that of the first permanent magnet at the first end of the cylinder body and the direction of the magnetic pole of the electromagnet is the same as that of the second permanent magnet at the second end of the cylinder body;

When the piston assembly moves to a position close to the end of the cylinder body, the control device controls the magnetic pole direction of the magnet driving assembly to be arranged in the reverse direction to achieve reverse buffering of the piston rod assembly, which includes:

When the distance sensor detects that the actual distance value between the piston and the end of the cylinder body is less than or equal to the preset target distance value, the control device controls the electromagnet to reverse the flow.

In the driving cylinder provided in the present application, a piston assembly is slidably installed in the cylinder body, and a magnet driving assembly is arranged between the cylinder body and the piston assembly. The magnet driving assembly can output a magnetic driving force. When the piston assembly needs to be extended, the control device provides the piston assembly with an extension driving force by controlling the magnetic pole direction of the magnet driving assembly. When the piston assembly needs to be retracted, the control device provides the piston assembly with a retraction driving force by controlling the magnetic pole direction of the magnet driving assembly. During the process of extending or retracting the piston assembly, when it moves to a position close to the end of the cylinder body, the control device controls the reverse arrangement of the magnetic poles of the magnet driving assembly to achieve reverse buffering of the piston assembly.

With this structural setting, a magnet driving assembly is arranged between the cylinder body and the piston assembly. The control device can drive the piston assembly to move along the cylinder body or reversely buffer the piston assembly by controlling the magnetic pole arrangement direction of the magnet driving assembly. Therefore, the mechanism of the driving cylinder is relatively simple, and there is no need to independently set up a mechanical brake device, and the cost is low.

Furthermore, in the power transmission system and the operating machine provided in the present application, since they both include the drive cylinder as described above, both also have the advantages as described above.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

FIG1 is a structural schematic diagram of a driving cylinder provided by the present application;

FIG2 is a second structural schematic diagram of the driving cylinder provided by the present application;

FIG3 is a schematic structural diagram of a brake member in a drive cylinder provided by the present application;

FIG4 is a schematic flow chart of a control method for a drive cylinder provided in the present application;

Reference numerals:

100, cylinder body; 101, first end; 102, second end; 201, piston; 202, piston rod; 203, wire passage cavity; 204, lead outlet; 301, first permanent magnet; 302, second permanent magnet; 303, electromagnet; 401, brake pad; 402, brake drive spring; 403, brake release drive member.

Detailed ways

The following is a further detailed description of the implementation of the present application in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application but cannot be used to limit the scope of the present application.

In the description of the embodiments of the present application, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it 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. For ordinary technicians in this field, The specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

In the embodiments of the present application, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

In the description of this specification, the description of reference terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, in the absence of mutual contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples to make the purpose, technical solutions and advantages of the embodiment of the present application clearer. The technical solutions in the embodiment of the present application will be clearly and completely described below in conjunction with the drawings in the embodiment of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

A driving cylinder, a power transmission system and a working machine provided in the embodiment of the present application are described below in conjunction with Figures 1 to 4. It should be understood that the following description is only an illustrative implementation of the present application and does not constitute any particular limitation to the present application.

An embodiment of the first aspect of the present application provides a driving cylinder, as shown in FIG. 1 and FIG. 2 , the driving cylinder includes a cylinder body 100 , a piston assembly, a magnet driving assembly and a control device.

The piston assembly is slidably connected to the cylinder body 100. The magnet drive assembly group is installed between the cylinder body 100 and the piston assembly. The magnet drive assembly can provide a magnetic driving force for the piston assembly. The control device is connected to the magnet drive assembly. The control device can control the magnetic pole direction of the magnet drive assembly to adjust the direction of the magnetic driving force of the magnet drive assembly, so that the piston assembly extends or contracts or reverses and buffers.

In the driving cylinder provided in the present application, a piston assembly is slidably installed in the cylinder body 100, and a magnet driving assembly is arranged between the cylinder body 100 and the piston assembly. The magnet driving assembly can output a magnetic driving force. When the piston assembly needs to be extended, the control device provides the piston assembly with an extension driving force by controlling the magnetic pole direction of the magnet driving assembly. When the piston assembly needs to be retracted, the control device provides the piston assembly with a retraction driving force by controlling the magnetic pole direction of the magnet driving assembly. During the process of extending or retracting the piston assembly, when it moves to a position close to the end of the cylinder body 100, the control device controls the reverse arrangement of the magnetic poles of the magnet driving assembly to achieve reverse buffering of the piston assembly.

With this structural setting, a magnet driving assembly is arranged between the cylinder body 100 and the piston assembly. The control device can drive the piston assembly to move along the cylinder body 100 or reversely buffer the piston assembly by controlling the magnetic pole arrangement direction of the magnet driving assembly. Therefore, the mechanism of the driving cylinder is relatively simple, and there is no need to independently set up a mechanical brake device, and the cost is low.

In one embodiment of the present application, the magnet driving assembly includes a first permanent magnet 301 , a second permanent magnet 302 and an electromagnet 303 .

The first permanent magnet 301 is mounted on one end of the cylinder 100, and the second permanent magnet 302 is mounted on the other end of the cylinder 100. The electromagnet 303 is mounted on the piston assembly. The magnetic poles of the first permanent magnet 301 and the magnetic poles of the second permanent magnet 302 are arranged facing each other.

For example, as shown in FIGS. 1 and 2 , the cylinder body 100 includes a first end 101 and a second end 102. The first permanent magnet 301 is mounted to the first end 101 of the cylinder body 100. The second permanent magnet 302 is mounted to the second end 102 of the cylinder body 100. In this embodiment, the N pole of the first permanent magnet 301 is arranged to a side close to the second end 102, and the N pole of the second permanent magnet 302 is arranged to a side close to the first end 101. That is, the N pole of the first permanent magnet 301 is arranged opposite to the N pole of the second permanent magnet 302, and the S pole of the first permanent magnet 301 is arranged opposite to the S pole of the second permanent magnet 302. An electromagnet 303 is mounted on the piston assembly.

For example, as shown in FIG1 , when the end of the electromagnet 303 close to the first permanent magnet 301 is the N pole and the end close to the second permanent magnet 302 is the S pole, the first permanent magnet 301 can generate an attractive force on the electromagnet 303, and at the same time, the second permanent magnet 302 can generate a repulsive force on the electromagnet 303. At this time, under the joint action of the first permanent magnet 301, the second permanent magnet 302 and the electromagnet 303, the piston 201 moves in a direction close to the first end 101.

As shown in FIG. 2 , when the end of the electromagnet 303 close to the first permanent magnet 301 is the S pole and the end close to the second permanent magnet 302 is the N pole, the first permanent magnet 301 can 303 generates a repulsive force, and at the same time, the second permanent magnet 302 can generate an attractive force on the electromagnet 303. At this time, under the joint action of the first permanent magnet 301, the second permanent magnet 302 and the electromagnet 303, the piston 201 moves in a direction away from the first end 101.

Through this structural setting, the first permanent magnet 301 and the second permanent magnet 302 can simultaneously drive the piston assembly to move along the cylinder body 100 in the same direction to achieve double thrust output. Therefore, under the same thrust requirement, the volume of the drive cylinder can be reduced to achieve a miniaturized design of the product. At the same time, by controlling the flow size of the electromagnet 303, the piston assembly can be smoothly controlled.

For example, the cylinder block 100 includes an aluminum alloy cylinder block 100 , which is lightweight and can achieve lightweighting of the cylinder block 100 .

In one embodiment of the present application, the piston assembly includes a piston 201 and a piston rod 202. The piston 201 is slidably mounted in the cylinder 100. One end of the piston rod 202 is connected to the piston 201, and the other end of the piston rod 202 passes through the cylinder 100 and extends to the outside of the cylinder 100.

The electromagnet 303 is connected to the piston 201. The piston rod 202 includes a wire passing cavity 203. The current-carrying wire of the electromagnet 303 passes through the wire passing cavity 203 and extends to the outside of the cylinder body 100.

For example, as shown in Figures 1 and 2, the piston assembly includes a piston 201 and a piston rod 202. The piston 201 is slidably installed in the inner cavity of the cylinder body 100. One end of the piston rod 202 is connected to the piston 201, and the other end of the piston rod 202 passes through the second end 102 of the cylinder body 100 and extends to the outside of the cylinder body 100. The interior of the piston rod 202 is a hollow structure. The hollow structure is a wire passing cavity 203. A lead outlet 204 is provided at the outer end of the piston rod 202. The current-carrying wire of the electromagnet 303 is passed through the wire passing cavity 203 and the lead outlet 204 to the outside of the drive cylinder to be connected to the power supply device. The power supply device can supply high voltage electricity to the electromagnet 303 to increase the driving force of the drive cylinder and reduce the volume of the drive cylinder. According to the above description, by providing the wire passing cavity 203 on the piston rod 202, the layout space of the current-carrying wire of the electromagnet 303 can be reduced, the volume of the drive cylinder can be reduced, the cost can be reduced, and the current-carrying wire of the electromagnet 303 can be effectively protected.

In one embodiment of the present application, the control device is electrically connected to the electromagnet 303. The control device is used to control the flow size and flow direction of the electromagnet 303.

Specifically, the control device can control the magnetic pole direction of the electromagnet 303 by adjusting the flow direction of the electromagnet 303, and further, can control the piston assembly to extend or retract. The magnitude of the magnetic force between the magnet 302 and the electromagnet 303 controls the magnitude of the driving force of the piston assembly and changes the moving speed of the piston assembly.

In addition, by controlling the flow direction and flow size of the electromagnet 303, the piston assembly of the drive cylinder can also have a buffering function. Specifically, for example, as shown in Figure 2, when the piston assembly is required to extend, the control device controls the flow direction of the electromagnet 303 so that the end of the electromagnet 303 close to the first permanent magnet 301 is the S pole and the end close to the second permanent magnet 302 is the N pole. The first permanent magnet 301 can generate a repulsive force on the electromagnet 303, and the second permanent magnet 302 can generate an attractive force on the electromagnet 303. At this time, under the joint action of the first permanent magnet 301, the second permanent magnet 302 and the electromagnet 303, the piston assembly extends. At the same time, the flow size of the electromagnet 303 can be adjusted according to actual needs to change the moving speed of the piston assembly.

When the piston 201 approaches the second end 102 of the cylinder body 100, the control device controls the electromagnet 303 to reversely flow, so that the end of the electromagnet 303 close to the first permanent magnet 301 is switched to the N pole, and the end close to the second permanent magnet 302 is switched to the S pole. At this time, the first permanent magnet 301 can generate an attractive force on the electromagnet 303, and the second permanent magnet 302 can generate a repulsive force on the electromagnet 303. As a result, the piston assembly can be pulled in the reverse direction, thereby forming a certain buffering effect on the piston assembly. In the process of reverse flow, the size of the reverse flow can be changed at the same time to adjust the buffering force of the piston assembly. As a result, a better buffering effect can be achieved without separately arranging a buffer device between the piston 201 and the cylinder body 100, thereby improving the quality of the drive cylinder and saving costs.

In one embodiment of the present application, a distance sensor is also installed at the end of the cylinder 100. The distance sensor is used to detect the distance between the end of the cylinder 100 and the piston 201. The control device is electrically connected to the distance sensor. The control device is used to control the flow size and flow direction of the electromagnet 303 based on the detection result of the distance sensor.

The distance sensor is used to detect the distance between the piston 201 and the first end 101 and the second end 102 of the cylinder 100. For example, a preset target distance value is provided in the control device. The preset target distance value is the target distance between the piston 201 and the first end 101 or the second end 102 of the cylinder 100. When the distance sensor detects that the distance between the piston 201 and the first end 101 or the second end 102 of the cylinder 100 is less than the preset target distance value, the control device controls the electromagnet 303 to flow in the reverse direction to buffer the piston 201 and prevent the piston 201 from violently colliding with the first end 101 or the second end 102 of the cylinder 100.

In another embodiment of the present application, the drive cylinder further includes an insulation detection member. The control device is used to detect the insulation of the power supply circuit of the electromagnet 303. The control device is electrically connected to the insulation detection member. The control device is used to control the current flow state of the electromagnet 303 based on the detection result of the insulation detection member.

When the insulation detection component detects that the insulation of the power supply circuit of the electromagnet 303 is good and there is no leakage, the control device can control the power supply device to supply power to the electromagnet 303. When the insulation detection component detects that there is a problem in the power supply circuit of the electromagnet 303, such as leakage, the control device controls the power supply device to disconnect from the electromagnet 303 to prevent high-voltage leakage.

In one embodiment of the present application, the driving cylinder further comprises a brake member, which is connected to the piston 201. The brake member can be switched between a braking position and a brake release position.

In the braking position, the braking member presses against the inner wall of the cylinder 100 to achieve friction braking; in the braking release position, the braking member separates from the inner wall of the cylinder 100 to release the friction braking.

Further, in one embodiment of the present application, the brake member includes a brake pad 401 , a brake drive spring 402 and a brake release drive member 403 .

The brake drive spring 402 is connected to the brake pad 401. The brake pad 401 is matched with the inner wall of the cylinder body 100. The brake drive spring 402 can drive the brake pad 401 to fit and press against the inner wall of the cylinder body 100, so that the brake member is switched to the brake position; the brake release drive member 403 is connected to the brake pad 401, and the brake release drive member 403 can drive the brake pad 401 to overcome the elastic force of the brake drive spring 402 and separate from the inner wall of the cylinder body 100, so that the brake member is switched to the brake release position.

Specifically, as shown in FIG3 , two brake pads 401 are symmetrically arranged in the cylinder body 100. For example, the brake release drive member 403 includes a telescopic rod. The two ends of the telescopic rod are respectively connected to the two brake pads 401. The telescopic drive form of the telescopic rod includes but is not limited to electric drive. A brake drive spring 402 is respectively arranged at both ends of each brake pad 401. For example, one end of the brake drive spring 402 is connected to the end of the brake pad 401, and the other end of the brake drive spring 402 is connected to the outer rod body of the telescopic rod. The telescopic rod is movably connected to the end face of the piston 201. That is, the telescopic rod can telescopically slide relative to the piston 201. The control device is connected to the telescopic rod and can control the working state of the telescopic rod.

During use, when the piston assembly needs to be telescopically moved normally, the control device can control both ends of the telescopic rod to retract in the direction close to the central axis of the cylinder body 100, so that the telescopic rod drives the brake pad 401 to overcome the elastic force of each brake drive spring 402 and move in the direction away from the side wall of the cylinder body 100. At this time, the brake member is switched to the brake release position. As a result, the piston assembly can be telescopically moved normally along the cylinder body 100.

When the piston assembly needs to be braked and locked, the control device can release the driving action on the telescopic rod, that is, the two ends of the telescopic rod can be freely extended and retracted, and under the action of the brake drive spring 402, each brake pad 401 can be attached to and pressed against the inner wall of the cylinder body 100 to perform friction braking and lock the piston assembly. Alternatively, the control device can also control the two ends of the telescopic rod to extend in a direction away from the central axis of the cylinder body 100, so that the telescopic rod drives the brake pad 401 to be attached to and pressed against the side wall of the cylinder body 100. Under the dual action of the telescopic rod and the brake drive spring 402, the braking force of the piston assembly can be further increased.

By providing a brake component, the piston assembly can be mechanically braked and locked to prevent accidents such as accidental falling of the piston assembly, thereby improving the safety performance of the driving cylinder.

The second aspect of the present application also provides a power transmission system, including the drive cylinder as described above. The drive cylinder is used as an actuator of the power transmission system to drive working accessories and the like.

An embodiment of the third aspect of the present application provides a working machine, comprising the drive cylinder or power transmission system as described above.

For example, in one embodiment of the present application, the working machine is an excavator. The driving cylinder can be used as a boom driving cylinder to adjust the posture of the boom to perform corresponding excavation actions.

It should be understood that the above embodiment is only an illustrative embodiment of the present application and does not constitute any limitation to the present application. That is to say, the specific type of the above working machinery includes but is not limited to an excavator. For example, in other embodiments of the present application, the above working machinery may also include a crane, etc.

Another embodiment of the present application further provides a control method for a driving cylinder, as shown in FIG4 , comprising:

determining a target motion of a piston assembly of a drive cylinder;

Further, in another embodiment of the present application, the step of the control device controlling the magnetic pole direction of the magnet drive assembly to extend or retract the piston assembly relative to the cylinder body includes:

For example, as shown in FIG2 , when the piston assembly is required to extend, the control device controls the flow direction of the electromagnet 303 so that the end of the electromagnet 303 close to the first permanent magnet 301 is the S pole and the end close to the second permanent magnet 302 is the N pole. The first permanent magnet 301 can generate a repulsive force on the electromagnet 303, and the second permanent magnet 302 can generate an attractive force on the electromagnet 303. At this time, under the joint action of the first permanent magnet 301, the second permanent magnet 302 and the electromagnet 303, the piston assembly extends. At the same time, the flow size of the electromagnet 303 can be adjusted according to actual needs to change the moving speed of the piston assembly.

When the actual distance value between the piston 201 and the second end 102 of the cylinder body 100 detected by the distance sensor is less than the preset target distance value, the control device controls the electromagnet 303 to reversely flow, so that the end of the electromagnet 303 close to the first permanent magnet 301 is switched to the N pole, and the end close to the second permanent magnet 302 is switched to the S pole. At this time, the first permanent magnet 301 can generate an attractive force on the electromagnet 303, and the second permanent magnet 302 can generate a repulsive force on the electromagnet 303. As a result, the piston assembly can be pulled in the reverse direction, thereby forming a certain buffering effect on the piston assembly. In the process of reverse flow, the size of the reverse flow can be changed at the same time to adjust the buffering force of the piston assembly.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

A driving cylinder comprises a cylinder body, a piston assembly, a magnet driving assembly and a control device.

Among them, the piston assembly is slidably connected to the cylinder body, the magnet drive assembly group is installed between the cylinder body and the piston assembly, the magnet drive assembly can provide a magnetic driving force for the piston assembly, the control device is connected to the magnet drive assembly, and the control device can control the magnetic pole direction of the magnet drive assembly to adjust the direction of the magnetic driving force of the magnet drive assembly, so as to make the piston assembly telescopic, movable or reverse buffered.
The drive cylinder according to claim 1, wherein the magnet drive assembly comprises a first permanent magnet, a second permanent magnet and an electromagnet,

The first permanent magnet is mounted on one end of the cylinder body, the second permanent magnet is mounted on the other end of the cylinder body, the electromagnet is mounted on the piston assembly, and the magnetic poles of the first permanent magnet and the magnetic poles of the second permanent magnet are arranged facing each other.
The drive cylinder according to claim 2, wherein the piston assembly comprises a piston and a piston rod, the piston is slidably mounted in the cylinder body, one end of the piston rod is connected to the piston, and the other end of the piston rod passes through the cylinder body and extends to the outside of the cylinder body,

The electromagnet is connected to the piston, the piston rod comprises a wire passing cavity, and the current-carrying wire of the electromagnet passes through the wire passing cavity and extends to the outside of the cylinder body.
The drive cylinder according to claim 3, wherein the control device is electrically connected to the electromagnet, and the control device is used to control the flow size and flow direction of the electromagnet.
The drive cylinder according to claim 4, wherein the drive cylinder further comprises a distance sensor, the distance sensor is used to detect the distance between the end of the cylinder body and the piston, the control device is electrically connected to the distance sensor, and the control device is used to control the flow size and flow direction of the electromagnet based on the detection result of the distance sensor.
The drive cylinder according to claim 3, wherein the drive cylinder further comprises a brake member, the brake member is connected to the piston, and the brake member can be switched between a braking position and a brake release position.

In the braking position, the braking member presses against the inner wall of the cylinder body to achieve friction braking; in the braking release position, the braking member separates from the inner wall of the cylinder body to release friction braking.
The drive cylinder according to claim 6, wherein the brake member comprises a brake pad, Brake drive spring and brake release drive,

Among them, the brake driving spring is connected to the brake pad, and the brake pad is adapted to the inner side wall of the cylinder body, and the brake driving spring can drive the brake pad to fit and press against the inner side wall of the cylinder body, so that the brake member is switched to the braking position; the brake release driving member is connected to the brake pad, and the brake release driving member can drive the brake pad to overcome the elastic force of the brake driving spring and separate from the inner side wall of the cylinder body, so that the brake member is switched to the brake release position.
The drive cylinder according to claim 4, wherein the drive cylinder further comprises an insulation detection component, the insulation detection component is used to detect the insulation of the electromagnet power supply circuit, the control device is electrically connected to the insulation detection component, and the control device is used to control the current flow state of the electromagnet based on the detection result of the insulation detection component.
A control method for a driving cylinder according to any one of claims 1 to 8, comprising:

determining a target motion of a piston assembly of a drive cylinder;

The control device controls the magnetic pole direction of the magnet drive assembly to extend or retract the piston assembly relative to the cylinder body;

When the piston assembly moves to a position close to the end of the cylinder body, the control device controls the magnetic poles of the magnet drive assembly to be arranged in reverse order to achieve reverse buffering of the piston rod assembly.
According to the control method of the drive cylinder of claim 9, the step of the control device controlling the magnetic pole direction of the magnet drive assembly to extend or retract the piston assembly relative to the cylinder body comprises:

When the piston assembly of the drive cylinder performs a contraction action, the control device controls the flow direction of the electromagnet so that the direction of the magnetic pole of the electromagnet is the same as that of the first permanent magnet at the first end of the cylinder body and the direction of the magnetic pole of the second permanent magnet at the second end of the cylinder body is opposite;

When the piston assembly of the drive cylinder is extended, the control device controls the flow direction of the electromagnet so that the direction of the magnetic pole of the electromagnet is opposite to that of the first permanent magnet at the first end of the cylinder body and the direction of the magnetic pole of the electromagnet is the same as that of the second permanent magnet at the second end of the cylinder body;

When the piston assembly moves to a position close to the end of the cylinder body, the control device controls the magnetic pole direction of the magnet driving assembly to be arranged in the reverse direction to achieve reverse buffering of the piston rod assembly, which includes:

The distance sensor detects that the actual distance between the piston and the end of the cylinder is less than or equal to the preset target value. When the marked distance value is reached, the control device controls the electromagnet to conduct current in the reverse direction.