阅读说明：本技术 一种油缸 (Oil cylinder ) 是由 董光斌 岳春秀 于 2021-01-06 设计创作，主要内容包括：本发明属于油缸技术领域,公开了一种行程距离可调的油缸。该油缸包括缸体、活塞、伸出行程调节组件和缩回行程调节组件；活塞位于缸体内部,并且将缸体的内部分割为互不连通的第一控制腔和第二控制腔,第一控制腔与A口保持连通,第二控制腔与B口保持连通,活塞在第一控制腔和第二控制腔之间的介质压力作用下进行往复运动；活塞的一端设有活塞杆,活塞杆穿过第一控制腔伸出至缸体的外部；伸出行程调节组件位于活塞与第一控制腔终端的缸体之间,用于控制活塞的伸出行程；缩回行程调节组件位于活塞与第二控制腔终端的缸体之间,用于控制活塞的缩回行程。本发明的油缸,可以对活塞的伸出和缩回行程距离进行调整,提高对油缸行程距离的控制效果。(The invention belongs to the technical field of oil cylinders and discloses an oil cylinder with an adjustable stroke distance. The oil cylinder comprises a cylinder body, a piston, an extension stroke adjusting assembly and a retraction stroke adjusting assembly; the piston is positioned in the cylinder body and divides the interior of the cylinder body into a first control cavity and a second control cavity which are not communicated with each other, the first control cavity is communicated with the port A, the second control cavity is communicated with the port B, and the piston reciprocates under the action of medium pressure between the first control cavity and the second control cavity; one end of the piston is provided with a piston rod, and the piston rod penetrates through the first control cavity and extends out of the cylinder body; the extension stroke adjusting assembly is positioned between the piston and the cylinder body at the terminal of the first control cavity and used for controlling the extension stroke of the piston; the retraction stroke adjusting assembly is positioned between the piston and the cylinder body at the terminal end of the second control cavity and is used for controlling the retraction stroke of the piston. The oil cylinder can adjust the extending and retracting stroke distance of the piston, and improves the control effect of the stroke distance of the oil cylinder.)

1. An oil cylinder is characterized by comprising a cylinder body, a piston, an extension stroke adjusting assembly and a retraction stroke adjusting assembly; the piston is positioned in the cylinder body and divides the interior of the cylinder body into a first control cavity and a second control cavity which are not communicated with each other, the first control cavity is communicated with the port A, the second control cavity is communicated with the port B, and the piston reciprocates under the action of medium pressure between the first control cavity and the second control cavity; a piston rod is arranged at one end of the piston, and the piston rod penetrates through the second control cavity and extends out of the cylinder body;

the extension stroke adjusting assembly is positioned between the piston and a cylinder body at the terminal end of the first control cavity and is used for controlling the extension stroke of the piston; the retraction stroke adjusting assembly is positioned between the piston and the cylinder body at the terminal end of the second control cavity and is used for controlling the retraction stroke of the piston.

2. The cylinder of claim 1, wherein the extension stroke adjustment assembly comprises a first adjustment cord, a first control assembly, and a first wheel; the first control assembly is positioned on the cylinder body, the first rotating wheel is positioned on the piston and can rotate, one end of the first adjusting rope is connected with the first rotating wheel, and the other end of the first adjusting rope is connected with the first control assembly;

the first adjusting rope is wound or released in the reciprocating rotation process of the first rotating wheel, and the first control assembly can adjust the length of the first adjusting rope between the cylinder body and the first rotating wheel.

3. The cylinder of claim 2, wherein the first pulley is rotatably coupled to the piston by a turbine coil spring to maintain the first adjustment cord in a wound state.

4. The cylinder of claim 2, wherein the first control assembly includes a first positioning assembly and a first ratchet; the first ratchet wheel is rotationally connected with the cylinder body, one end of the first adjusting rope is fixedly connected with the first ratchet wheel, the first ratchet wheel is wound when rotating in the forward direction, and the first ratchet wheel is released when rotating in the reverse direction; the first positioning component is movably connected with the ratchet teeth of the first ratchet wheel so as to limit the reverse rotation of the first ratchet wheel.

5. The cylinder of claim 4, wherein the first positioning assembly comprises a first positioning piston, a first positioning elastic member, a first positioning hole and a first positioning handle; the first positioning hole is formed in the cylinder body, the first positioning elastic piece is located in the first positioning hole, one end of the first positioning piston is located in the positioning hole and keeps contact with the first positioning elastic piece, and the other end of the first positioning piston can extend out of the first positioning hole to be connected with the ratchet of the first ratchet; one end of the first positioning handle is connected with the first positioning piston, and the other end of the first positioning handle extends to the outside of the cylinder body so as to drive the positioning piston to reciprocate along the first positioning hole.

6. The cylinder of claim 1, wherein the retraction stroke adjustment assembly includes a second adjustment cord, a second control assembly, and a second wheel; the second control assembly is positioned on the cylinder body, the second rotating wheel is positioned on the piston and can rotate, one end of the second adjusting rope is connected with the second rotating wheel, and the other end of the second adjusting rope is connected with the second control assembly;

the second adjusting rope is wound or released in the reciprocating rotation process of the second rotating wheel, and the second control assembly can adjust the length of the second adjusting rope between the cylinder body and the second rotating wheel.

7. The cylinder of claim 6 wherein said second pulley is rotatably connected to said piston by a turbine coil spring to maintain said second adjustment cord in a wrapped condition.

8. The cylinder of claim 6, wherein the second control assembly includes a second positioning assembly and a second ratchet; the second ratchet wheel is rotationally connected with the cylinder body, one end of the second adjusting rope is fixedly connected with the ratchet wheel, the second ratchet wheel is wound when rotating in the forward direction, and the second ratchet wheel is released when rotating in the reverse direction; the second positioning assembly is movably connected with the ratchet of the second ratchet wheel so as to limit the reverse rotation of the second ratchet wheel.

9. The cylinder of claim 8, wherein the second positioning assembly comprises a second positioning piston, a second positioning elastic member, a second positioning hole and a second positioning handle; the second positioning hole is formed in the cylinder body, the second positioning elastic piece is located in the second positioning hole, one end of the second positioning piston is located in the positioning hole and keeps contact with the second positioning elastic piece, and the other end of the second positioning piston can extend out of the second positioning hole to be connected with the ratchet of the second ratchet; one end of the second positioning handle is connected with the second positioning piston, and the other end of the second positioning handle extends to the outside of the cylinder body so as to drive the positioning piston to reciprocate along the second positioning hole.

10. The cylinder according to any one of claims 1 to 9, wherein the cylinder is further provided with a guide rod; the guide rod is located inside the cylinder body, penetrates through the piston along the axial direction, is in sliding connection with the piston, and is fixedly connected with the cylinder body at two ends.

Technical Field

The invention belongs to the technical field of oil cylinders, and particularly relates to an oil cylinder with an adjustable stroke distance.

Background

The hydraulic cylinder is a linear motion type actuating element commonly used in a hydraulic system and is mainly divided into a piston type, a plunger type and a telescopic type according to different structural modes. The oil cylinder has simple structure, reliable operation and wide application, and can be directly connected with the operating mechanism for operation.

The stroke and the installation distance of the oil cylinder are one of important parameters in the design work of the whole mechanism. However, in the actual use process, the host customer sometimes needs the stroke and the installation distance of the oil cylinder to be adjustable, and the transmission of the mechanism can be realized within a certain range. Even some host operating mechanisms need to dynamically adjust the stroke and the installation distance of the oil cylinder in the debugging or working process.

However, the stroke and the installation distance of the conventional common oil cylinder are fixed and cannot be adjusted, and although some oil cylinders capable of adjusting the stroke exist in the prior art, most of the oil cylinders need to be fixed on the piston rod by a positioner and a clamping device, so that the piston rod is damaged to a certain extent, the oil seal is not favorable for controlling the stroke of the oil cylinder only after extending out to the longest extent, and the use has limitation.

Disclosure of Invention

In order to improve the control effect on the stroke distance of the oil cylinder, the invention provides the oil cylinder. The oil cylinder comprises a cylinder body, a piston, an extension stroke adjusting assembly and a retraction stroke adjusting assembly; the piston is positioned in the cylinder body and divides the interior of the cylinder body into a first control cavity and a second control cavity which are not communicated with each other, the first control cavity is communicated with the port A, the second control cavity is communicated with the port B, and the piston reciprocates under the action of medium pressure between the first control cavity and the second control cavity; a piston rod is arranged at one end of the piston, and the piston rod penetrates through the second control cavity and extends out of the cylinder body; the extension stroke adjusting assembly is positioned between the piston and a cylinder body at the terminal end of the first control cavity and is used for controlling the extension stroke of the piston; the retraction stroke adjusting assembly is positioned between the piston and the cylinder body at the terminal end of the second control cavity and is used for controlling the retraction stroke of the piston.

Preferably, the extension stroke adjusting assembly comprises a first adjusting rope, a first control assembly and a first rotating wheel; the first control assembly is positioned on the cylinder body, the first rotating wheel is positioned on the piston and can rotate, one end of the first adjusting rope is connected with the first rotating wheel, and the other end of the first adjusting rope is connected with the first control assembly; the first adjusting rope is wound or released in the reciprocating rotation process of the first rotating wheel, and the first control assembly can adjust the length of the first adjusting rope between the cylinder body and the first rotating wheel.

Further preferably, the first pulley is rotatably connected with the piston through a turbine coil spring to maintain a winding state of the first adjusting rope.

Further preferably, the first control assembly comprises a first positioning assembly and a first ratchet; the first ratchet wheel is rotationally connected with the cylinder body, one end of the first adjusting rope is fixedly connected with the first ratchet wheel, the first ratchet wheel is wound when rotating in the forward direction, and the first ratchet wheel is released when rotating in the reverse direction; the first positioning component is movably connected with the ratchet teeth of the first ratchet wheel so as to limit the reverse rotation of the first ratchet wheel.

Further preferably, the first positioning assembly comprises a first positioning piston, a first positioning elastic piece, a first positioning hole and a first positioning handle; the first positioning hole is formed in the cylinder body, the first positioning elastic piece is located in the first positioning hole, one end of the first positioning piston is located in the positioning hole and keeps contact with the first positioning elastic piece, and the other end of the first positioning piston can extend out of the first positioning hole to be connected with the ratchet of the first ratchet; one end of the first positioning handle is connected with the first positioning piston, and the other end of the first positioning handle extends to the outside of the cylinder body so as to drive the positioning piston to reciprocate along the first positioning hole.

Preferably, the retraction stroke adjusting assembly comprises a second adjusting rope, a second control assembly and a second rotating wheel; the second control assembly is positioned on the cylinder body, the second rotating wheel is positioned on the piston and can rotate, one end of the second adjusting rope is connected with the second rotating wheel, and the other end of the second adjusting rope is connected with the second control assembly; the second adjusting rope is wound or released in the reciprocating rotation process of the second rotating wheel, and the second control assembly can adjust the length of the second adjusting rope between the cylinder body and the second rotating wheel.

Further preferably, the second runner is rotatably connected with the piston through a turbine coil spring so as to maintain a winding state of the second adjusting rope.

Further preferably, the second control assembly comprises a second positioning assembly and a second ratchet; the second ratchet wheel is rotationally connected with the cylinder body, one end of the second adjusting rope is fixedly connected with the ratchet wheel, the second ratchet wheel is wound when rotating in the forward direction, and the second ratchet wheel is released when rotating in the reverse direction; the second positioning assembly is movably connected with the ratchet of the second ratchet wheel so as to limit the reverse rotation of the second ratchet wheel.

Further preferably, the second positioning assembly comprises a second positioning piston, a second positioning elastic piece, a second positioning hole and a second positioning handle; the second positioning hole is formed in the cylinder body, the second positioning elastic piece is located in the second positioning hole, one end of the second positioning piston is located in the positioning hole and keeps contact with the second positioning elastic piece, and the other end of the second positioning piston can extend out of the second positioning hole to be connected with the ratchet of the second ratchet; one end of the second positioning handle is connected with the second positioning piston, and the other end of the second positioning handle extends to the outside of the cylinder body so as to drive the positioning piston to reciprocate along the second positioning hole.

Preferably, the oil cylinder is also provided with a guide rod; the guide rod is located inside the cylinder body, penetrates through the piston along the axial direction, is in sliding connection with the piston, and is fixedly connected with the cylinder body at two ends.

Compared with the oil cylinder with the existing structure, the oil cylinder has the following beneficial technical effects:

1. in the invention, the extension stroke adjusting assembly and the retraction stroke adjusting assembly are arranged between the piston and the cylinder body, and the extension stroke adjusting assembly is used for controlling the stroke of the piston in the extension moving process and the retraction stroke adjusting assembly is used for controlling the formation of the retraction moving process of the piston, so that the two-way control of the reciprocating stroke of the piston can be realized, and the control effect of the stroke distance of the oil cylinder is improved.

2. In the invention, the rotating wheel is driven by the turbine coil spring to rotate so as to keep the winding effect of the adjusting rope, the handle is used for controlling the positioning piston to carry out reverse rotation limitation on the ratchet wheel, and the rotating hand wheel is arranged to drive the ratchet wheel to rotate so as to control the release and winding of the adjusting rope, so that the length of the adjusting rope can be freely and flexibly adjusted, the accurate adjustment of the extending and retracting strokes of the piston is met, the extending stroke and the retracting stroke of the piston can be independently adjusted, the difference setting of the extending stroke distance and the retracting stroke distance in the single reciprocating movement process of the piston can be realized, the flexibility of adjusting and controlling the piston stroke is greatly improved, and the use efficiency and the use flexibility of the whole oil cylinder are further improved.

3. In the invention, the extension stroke adjusting assembly and the retraction stroke adjusting assembly are axially arranged between the piston and the cylinder body, so that the piston rod is not required to be arranged and adjusted, the interference acting force on the piston rod is further avoided, the damage to the piston rod is reduced to the maximum extent, the service life of the whole oil cylinder is prolonged, and the working stability of the whole oil cylinder is improved.

Drawings

FIG. 1 is a schematic cross-sectional view of the cylinder of the present embodiment;

FIG. 2 is a schematic cross-sectional view taken along the direction M-M in FIG. 1;

FIG. 3 is a schematic cross-sectional view of the piston shown in FIG. 1 in the direction N-N;

FIG. 4 is a schematic cross-sectional view taken along the line Q-Q of FIG. 3;

fig. 5 is a schematic cross-sectional view taken along the direction P-P in fig. 1.

Detailed Description

The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and embodiments.

Referring to fig. 1, the cylinder of the present embodiment includes a cylinder body 1, a piston 2, an extension stroke adjusting assembly, and a retraction stroke adjusting assembly. Wherein, be equipped with A mouth and the B mouth with different pipeline intercommunications respectively on cylinder body 1, piston 2 is located cylinder body 1's inside to with cylinder body 1's inside segmentation into first control chamber 11 and the second control chamber 12 that do not communicate each other, first control chamber 11 keeps the intercommunication with A mouth, second control chamber 12 keeps the intercommunication with the B mouth, piston 2 can carry out reciprocating motion along cylinder body 1's axis direction under the effect of medium pressure between first control chamber 11 and second control chamber 12 this moment. One end of the piston 2 is provided with a piston rod, and the piston rod passes through the second control cavity 11 and extends out of the cylinder body 1 to drive an external workpiece to act.

The extension stroke adjusting assembly is located between the piston and the cylinder body at the terminal end of the first control cavity and used for controlling the extension stroke of the piston. The retraction stroke adjusting assembly is positioned between the piston and the cylinder body at the terminal end of the second control cavity and is used for controlling the retraction stroke of the piston.

At the moment, the stroke control of the extending moving process of the piston is carried out by the extending stroke adjusting assembly and the stroke control of the retracting moving process of the piston is carried out by the retracting stroke adjusting assembly, so that the two-way control of the reciprocating stroke of the piston can be realized, and the control effect of the stroke distance of the oil cylinder is improved.

Referring to fig. 1, in the present embodiment, the extension stroke adjusting assembly includes a first adjusting rope 31, a first control assembly 32, and a first pulley 33. Wherein, the first control assembly 32 is located on the cylinder 1, the first runner 33 is located on the piston 2 and can perform reciprocating rotation, one end of the first adjusting rope 31 is fixedly connected with the first runner 33, and the other end is connected with the first control assembly 32. When the first pulley 33 rotates in a reciprocating manner, the first adjusting rope 31 may be wound or released, and the first control assembly 32 may be fixedly connected to different positions of the first adjusting rope 31 along the length direction of the first adjusting rope 31, control the length of the first adjusting rope 31 wound around the first pulley 33, and adjust the length of the first adjusting rope 31 between the cylinder 1 and the first pulley 33.

At the moment, the maximum length of the first adjusting rope between the first control component and the first rotating wheel can be adjusted by adjusting the fixed position of the first control component on the first adjusting rope in advance, so that the length of the first adjusting rope released by the first rotating wheel rotating along with the piston in the moving process is limited, and the maximum stroke distance control of the piston in extending and moving is achieved.

In this embodiment, the first rotating wheel is designed to be capable of rotating in a reciprocating manner, so that the first adjusting rope with the length set by the first control assembly can be wound on the first rotating wheel in advance before the piston moves, and then the first rotating wheel rotates reversely to gradually release the first adjusting rope in the moving process of the piston. Therefore, the first adjusting rope can be prevented from being directly stacked in the second control cavity before the piston moves, the first adjusting rope is prevented from being tangled to interfere the normal movement of the piston, and the normal extending movement of the piston is guaranteed.

As shown in fig. 1, 3 and 4 in combination, in the present embodiment, the first pulley 33 is rotatably connected to the piston 2 by the first turbine coil spring 34, and the first pulley 33 is driven to rotate by the first turbine coil spring 34 to maintain a wound state of the first adjusting rope 31.

At the moment, after the length of the first adjusting rope is adjusted through the first control assembly, the first rotating wheel rotates under the driving of the first turbine coil spring, the redundant first adjusting rope between the piston and the cylinder body can be directly wound and stored rapidly, and then in the moving process of the piston, the first rotating wheel is reversely driven to rotate by overcoming the pretightening force of the first turbine coil spring so as to release the first adjusting rope in real time. Therefore, the real-time accurate automatic control of the length of the first adjusting rope between the piston and the cylinder body can be realized, and the normal reciprocating movement of the piston is ensured.

As shown in fig. 1, in the present embodiment, the first control assembly 32 includes a first positioning assembly 321 and a first ratchet 322. Wherein, first ratchet 322 rotates with cylinder body 1 to be connected, and the one end and the first ratchet 322 fixed connection of first regulation rope 31 to first ratchet 322 carries out the winding operation to first regulation rope 31 when carrying out forward rotation, and first ratchet 322 releases operation to first regulation rope 31 when carrying out reverse rotation. The first positioning assembly 321 is movably connected with the ratchet teeth of the first ratchet wheel 322 to limit the reverse rotation of the first ratchet wheel 322.

At this moment, carry out the length that positive and negative direction's rotation just can be adjusted to be located the first regulation rope between piston and the cylinder body through driving first ratchet to in the first control assembly to first ratchet antiport's injecing, just can avoid the unexpected rotation of first ratchet and release first regulation rope, prevent the unexpected change of first regulation rope length, thereby guarantee to the accurate control of piston extension stroke distance.

Referring to fig. 5, in the present embodiment, a rotating handwheel 323 is provided on the first ratchet wheel 322, and the rotating handwheel 323 is disposed outside the cylinder body 1. Therefore, the first ratchet wheel can be driven to rotate in the positive and negative directions by manually rotating the rotating hand wheel, so that the first adjusting rope is wound and released. Furthermore, a length adjusting structure, such as a length value dial, can be arranged on the rotating hand wheel, so that the winding and releasing operation of the first adjusting rope can be more accurately carried out.

As shown in fig. 1, in the present embodiment, the first positioning assembly 321 includes a first positioning piston 3211, a first positioning elastic member 3212, a first positioning hole 3213, and a first positioning handle 3214. The first positioning hole 3213 is opened in the cylinder 1, the first positioning resilient member 3212 is located in the first positioning hole 3213, one end of the first positioning piston 3211 is located in the first positioning hole 3213 and keeps in contact with the first positioning resilient member 3212, and the other end of the first positioning piston can extend out of the first positioning hole 3213 to be connected to the ratchet of the first ratchet 322. Meanwhile, one end of the first positioning handle 3214 is connected to the first positioning piston 3211, and the other end extends to the outside of the cylinder 1, so as to drive the first positioning piston 3211 to reciprocate along the first positioning hole 3213.

At the moment, under the driving acting force of the first positioning elastic piece on the first positioning piston, the first positioning piston can extend out of the first positioning hole and is connected with the ratchet of the first ratchet wheel, so that the reverse rotation of the first ratchet wheel is limited, and the length release of the first adjusting rope is further limited. On the contrary, the first positioning handle is pushed to drive the first positioning piston to overcome the acting force of the first positioning elastic piece, so that the first positioning piston moves into the first positioning hole to release the reverse rotation of the first ratchet wheel, and the length of the first adjusting rope can be released again. Meanwhile, if the length of the first adjusting rope between the piston and the cylinder body needs to be shortened, even if the first positioning piston and the first ratchet wheel are limited in reverse rotation, the first ratchet wheel can be driven to rotate forwards through the first rotating hand wheel, so that the first adjusting rope is recycled and wound, and the length shortening adjustment of the first adjusting rope is completed.

In this embodiment, the retraction stroke adjustment assembly is similar in structure and function to the extension stroke adjustment assembly. As shown in connection with fig. 1, the retraction stroke adjustment assembly includes a second adjustment cord 41, a second control assembly 42, and a second pulley 43. Wherein, the second control assembly 42 is located on the cylinder 1, the second runner 43 is located on the piston 2 and can perform reciprocating rotation, one end of the second adjusting rope 41 is fixedly connected with the second runner 43, and the other end is connected with the second control assembly 42. When the second pulley 43 performs reciprocating rotation, the second adjusting rope 41 may be wound or released, and the second control assembly 42 may be fixedly connected to different positions of the second adjusting rope 41 along the length direction of the second adjusting rope 41, control the length of the second adjusting rope 41 wound on the second pulley 43, and adjust the length of the second adjusting rope 41 between the cylinder 1 and the second pulley 43.

At the moment, the maximum length of the second adjusting rope between the second control component and the second rotating wheel can be adjusted by adjusting the fixed position of the second control component on the second adjusting rope in advance, so that the length of the second adjusting rope released by the second rotating wheel rotating along with the piston in the moving process is limited, and the maximum stroke distance control of the piston retraction movement is achieved.

In the present embodiment, as shown in fig. 1, 3 and 4, the second pulley 43 is also rotatably connected to the piston 2 via the second turbine coil spring 44, and the second pulley 43 is driven to rotate by the second turbine coil spring 44, so as to achieve the winding state of the second adjusting rope 41.

As shown in fig. 1, in the present embodiment, the second control assembly 42 includes a second positioning assembly 421 and a second ratchet 422. The second ratchet wheel 422 is rotatably connected with the cylinder body 1, one end of the second adjusting rope 41 is fixedly connected with the second ratchet wheel 422, the second adjusting rope 41 can be wound when the second ratchet wheel 422 rotates in the forward direction, and the second adjusting rope 41 is released when the second ratchet wheel 422 rotates in the reverse direction. The second positioning assembly 421 is movably connected to the ratchet of the second ratchet 422 to limit the reverse rotation of the second ratchet 422.

At this moment, carry out the length that the second adjusted the rope between piston and cylinder body just can be adjusted to rotation that positive and negative direction was carried out through the drive second ratchet to in second control assembly to second ratchet antiport's injecing, just can avoid the unexpected rotation of second ratchet and release the second and adjust the rope, prevent the unexpected change of second regulation rope length, thereby guarantee the accurate control to piston withdrawal stroke distance.

In addition, a rotating hand wheel is also arranged on the second ratchet wheel to drive the second ratchet wheel to rotate, so that the length of the second adjusting rope released by the second ratchet wheel can be accurately adjusted.

As shown in fig. 1, in the present embodiment, the second positioning assembly 421 is similar to the first positioning assembly 321 in structure and includes a second positioning piston 4211, a second positioning elastic member 4212, a second positioning hole 4213 and a second positioning handle 4214. The second positioning hole 4213 is opened on the cylinder 1, the second positioning elastic member 4212 is located in the second positioning hole 4213, one end of the second positioning piston 4211 is located in the second positioning hole 4213 and keeps contact with the second positioning elastic member 4212, and the other end can extend out of the second positioning hole 4213 to be connected with the ratchet of the second ratchet wheel 422. Meanwhile, one end of the second positioning handle 4214 is connected to the second positioning piston 4211, and the other end extends to the outside of the cylinder 1, so as to drive the second positioning piston 4211 to reciprocate along the second positioning hole 4213. Thus, the reciprocating rotation of the second ratchet wheel can be controlled by controlling the driving of the second positioning piston.

In addition, as shown in fig. 2, a guide rod 5 is further provided in the cylinder of the present embodiment. The guide rod 5 is located inside the cylinder 1, and both ends of the guide rod are fixedly connected with the cylinder 1 after penetrating through the piston 2 along the axial direction, and meanwhile, the guide rod 5 is in sliding connection with the piston 2.

Like this, with the help of the sliding connection of guide bar and piston, just can effectively avoid the piston to remove the spool rotation that probably takes place in-process to prevent that the piston from driving first regulation rope and second regulation rope and carrying out the spool rotation and produce the winding, guarantee first regulation rope and second regulation rope to the accurate control of piston reciprocating motion stroke.

Referring to fig. 1 to 5, when the oil cylinder of this embodiment operates, the port a and the port B are respectively communicated with an external pipeline, so that the piston 2 can reciprocate under the action of the medium pressure between the first control chamber 11 and the second control chamber 12, and further, the piston rod is driven to extend and retract.

When the piston 2 moves from the terminal position of the first control chamber 11 to the terminal direction of the second control chamber 12 to drive the piston rod to extend, the first positioning handle 3214 is first driven to drive the first positioning piston 3211 to overcome the acting force of the first positioning elastic element 3212, so that the first positioning piston 3211 moves and is retained in the first positioning hole 3213 to release the limitation of the reverse rotation of the first ratchet 322. Then, according to the stroke distance of the piston 2 extending and moving, the first ratchet wheel 322 is rotated to release or recover and wind the length of the first adjusting rope 31, and after the length of the first adjusting rope 31 is adjusted, the first positioning handle 3214 is released, so that the first positioning piston 3211 extends out of the first positioning hole 3213 again under the action of the first positioning elastic element 3212, and the first ratchet wheel 322 is restricted from rotating in the reverse direction again. Meanwhile, the first pulley 33 winds and stores the first adjusting rope 31 released by the first ratchet 322 in real time under the action of the first turbine coil spring 34. Then the piston 2 drives the piston rod to extend under the action of medium pressure between the first control cavity 11 and the second control cavity 12, and simultaneously the first ratchet wheel 322 overcomes the pretightening force of the first turbine coil spring 34 under the action of the tension of the first adjusting rope 31, so that the first rotating wheel 33 rotates in the reverse direction to synchronously release the first adjusting rope 31, and after the first adjusting rope 31 is completely released, the first adjusting rope 31 generates the reverse tension to the piston 2 along the moving direction of the piston, so that the piston 2 stops moving continuously, and the limit of the extending stroke of the piston 2 is reached. Meanwhile, during the extending movement of the piston 2, the second turbine coil spring 44 drives the second pulley 43 to rotate, thereby synchronously winding and storing the second adjusting rope 41 in real time.

When the piston 2 moves from the terminal position of the second control chamber 12 to the terminal direction of the first control chamber 11 to drive the piston rod to perform retraction movement, the second positioning handle 4214 is first driven to drive the second positioning piston 4211 to overcome the acting force of the second positioning elastic member 4212, so that the second positioning piston 4211 moves and is retained in the second positioning hole 4213 to release the reverse rotation limitation of the second ratchet wheel 422. Then, according to the stroke distance of the piston 2 for retraction movement, the second ratchet wheel 422 is rotated to release or retract the length of the second adjusting rope 41, and after the length of the second adjusting rope 41 is released, the second positioning handle 4214 is released, so that the second positioning piston 4211 extends out of the second positioning hole 4213 again under the action of the second positioning elastic member 4212 and forms reverse rotation limitation on the second ratchet wheel 422 again. Meanwhile, the second pulley 43 completes winding and storing the second adjusting rope 41 released by the second ratchet wheel 422 under the action of the second turbine coil spring 44. Then the piston 2 drives the piston rod to retract under the action of medium pressure between the second control cavity 12 and the second control cavity 11, and simultaneously, under the action of tension of the second ratchet wheel 422 on the second adjusting rope 41, the pretightening force of the second turbine coil spring 44 is overcome, so that the second rotating wheel 43 rotates reversely to synchronously release the second adjusting rope 41, and after the second adjusting rope 41 is completely released, the second adjusting rope 41 generates reverse tension in the moving direction of the piston 2, so that the piston 2 stops moving continuously, and the limit on the retracting stroke of the piston 2 is reached. Meanwhile, during the extending movement of the piston 2, the first turbine coil spring 34 drives the first pulley 33 to rotate, thereby synchronously winding and storing the first adjusting rope 31 in real time.

In the above description of the reciprocating movement of the piston, the lengths of the first adjusting rope and the second adjusting rope are adjusted respectively, that is, the first adjusting rope is adjusted before the piston driving piston rod extends out, and the second adjusting rope is adjusted before the piston driving piston rod retracts, so that the first adjusting rope and the second adjusting rope can be adjusted in real time according to the change of the working conditions. Similarly, according to different use conditions, the first adjusting rope and the second adjusting rope can be completely adjusted in advance, and then the piston can directly reciprocate.