阅读说明：本技术 一种单伸缩推力倍增液压缸 (Single-telescopic thrust multiplication hydraulic cylinder ) 是由 王刚 冯绪良 景传明 崔飞龙 于善利 于 2020-05-07 设计创作，主要内容包括：本发明提供了一种单伸缩推力倍增液压缸,属于液压缸领域。该单伸缩推力倍增液压缸,缸体内部装配柱塞座,柱塞套的下端装配于柱塞座上,柱塞套位于缸体内部,柱塞套的上端装配活塞；活塞缸可相对于缸体直线往复移动,活塞位于活塞缸内部,活塞相对于活塞缸直线往复移动；在活塞缸的下端与柱塞座之间的腔体形成第一伸出腔,在活塞缸的上端与活塞之间的腔体形成第二伸出腔,在活塞缸的下端与活塞之间的腔体形成缩回腔；第一伸出液路连接第一伸出腔,第二伸出液路连接第二伸出腔,缩回液路连接缩回腔。本发明在为液压缸提供液压油压强保持不变的条件下,不增加液压缸的数量,增大液压缸的活塞作用面积以提高液压缸的推力。(The invention provides a single telescopic thrust multiplication hydraulic cylinder, and belongs to the field of hydraulic cylinders. The single-telescopic thrust multiplication hydraulic cylinder is characterized in that a plunger seat is assembled in a cylinder body, the lower end of a plunger sleeve is assembled on the plunger seat, the plunger sleeve is positioned in the cylinder body, and a piston is assembled at the upper end of the plunger sleeve; the piston cylinder can linearly reciprocate relative to the cylinder body, the piston is positioned in the piston cylinder, and the piston linearly reciprocates relative to the piston cylinder; a first extending cavity is formed in a cavity between the lower end of the piston cylinder and the plunger seat, a second extending cavity is formed in a cavity between the upper end of the piston cylinder and the piston, and a retracting cavity is formed in a cavity between the lower end of the piston cylinder and the piston; the first extending liquid path is connected with the first extending cavity, the second extending liquid path is connected with the second extending cavity, and the retracting liquid path is connected with the retracting cavity. According to the invention, under the condition that the pressure intensity of hydraulic oil provided for the hydraulic cylinder is kept unchanged, the number of the hydraulic cylinders is not increased, and the piston action area of the hydraulic cylinder is increased to improve the thrust of the hydraulic cylinder.)

1. The utility model provides a single flexible thrust multiplication pneumatic cylinder which characterized in that: the plunger piston comprises a cylinder body, a plunger seat, a plunger sleeve, a piston cylinder, a first extending liquid path, a second extending liquid path and a retracting liquid path;

a plunger seat is assembled in the cylinder body and close to the lower end of the cylinder body, the lower end of a plunger sleeve is assembled on the plunger seat, the plunger sleeve is positioned in the cylinder body and is coaxially arranged with the cylinder body, and a piston is assembled at the upper end of the plunger sleeve;

the lower end of the piston cylinder extends into the cylinder body from the upper end of the cylinder body, the piston cylinder can linearly reciprocate relative to the cylinder body, the upper end of the plunger sleeve extends into the piston cylinder from the lower end of the piston cylinder, the piston is positioned in the piston cylinder, and the piston linearly reciprocates relative to the piston cylinder;

a first extending cavity is formed in the cylinder body and in a cavity between the lower end of the piston cylinder and the plunger seat, a second extending cavity is formed in the piston cylinder and in a cavity between the upper end of the piston cylinder and the piston, and a retracting cavity is formed in the piston cylinder and in a cavity between the lower end of the piston cylinder and the piston;

the first extending liquid path is connected with the first extending cavity, the second extending liquid path is connected with the second extending cavity, and the retracting liquid path is connected with the retracting cavity.

2. The single telescopic thrust multiplying hydraulic cylinder according to claim 1, characterized in that: the cylinder body is provided with a liquid extending port, a liquid injection cavity is formed in the cylinder body and in a cavity between the plunger seat and the lower end of the cylinder body, and the liquid extending port is communicated with the liquid injection cavity;

the first liquid extending path is arranged as a liquid extending through hole, the liquid extending through hole is arranged in the plunger seat, and the liquid injecting cavity and the first extending cavity are communicated through the liquid extending through hole;

the second stretches out the liquid way and sets up to stretching out and leads to the liquid pipe, stretches out to lead to the liquid pipe and sets up in the inside of plunger bushing, stretches out to lead to liquid pipe intercommunication and annotates liquid chamber and second and stretch out the chamber.

3. The single telescopic thrust multiplying hydraulic cylinder according to claim 2, characterized in that: the cylinder body is provided with a retraction liquid port, and the retraction liquid path is provided with a first retraction liquid through hole channel, a second retraction liquid through hole channel, a retraction liquid through gap and a third retraction liquid through hole channel which are sequentially communicated;

the first retracting liquid through hole is arranged in the plunger seat;

the second retraction liquid through hole is formed in the lower end of the plunger sleeve and penetrates through the side wall of the plunger sleeve;

two ends of the plunger sleeve are respectively assembled and blocked with the extending liquid through pipe, and a space between the extending liquid through pipe and the inner wall of the plunger sleeve forms a retracting liquid through clearance;

the third retraction liquid through hole is formed in the upper end of the plunger sleeve and penetrates through the side wall of the plunger sleeve;

the liquid withdrawing port is communicated with the liquid withdrawing cavity through a first liquid withdrawing and communicating pore passage, a second liquid withdrawing and communicating pore passage, a liquid withdrawing and communicating gap and a third liquid withdrawing and communicating pore passage in sequence.

4. A single telescopic thrust multiplying hydraulic cylinder according to claim 3, characterized in that: the liquid retracting port, the first liquid retracting hole and the second liquid retracting hole are positioned on the same axis.

5. A single telescopic thrust multiplying hydraulic cylinder according to claim 3, characterized in that: the liquid pipe extends out and is coaxially arranged with the plunger sleeve.

6. The single telescopic thrust multiplying hydraulic cylinder according to claim 1, characterized in that: the cylinder body comprises a cylinder sleeve and a cylinder end cover, and the cylinder end cover is assembled at the lower end of the cylinder sleeve.

7. The single telescopic thrust multiplying hydraulic cylinder according to claim 6, characterized in that: the cylinder body further comprises a first guide sleeve, the upper end of the cylinder sleeve is provided with the first guide sleeve, and the piston cylinder is connected in the first guide sleeve in a sliding mode.

8. The single telescopic thrust multiplying hydraulic cylinder according to claim 7, characterized in that: the upper end of cylinder liner is provided with the internal thread, and the outer wall of first uide bushing is provided with the external screw thread, the first uide bushing of upper end threaded connection of cylinder liner.

9. The single telescopic thrust multiplying hydraulic cylinder according to claim 1, characterized in that: the piston cylinder comprises a piston sleeve and a second guide sleeve, the second guide sleeve is assembled at the lower end of the piston sleeve, and the plunger sleeve is connected in the second guide sleeve in a sliding mode.

10. The single telescopic thrust multiplying hydraulic cylinder of claim 9, wherein: the piston cylinder also comprises a force application part, and the force application part is detachably connected with the upper end of the piston sleeve.

Technical Field

The invention relates to the field of hydraulic cylinders, in particular to a single telescopic thrust multiplication hydraulic cylinder.

Background

Hydraulic cylinders are widely used in hydraulic equipment in various industries, such as hydraulic presses. The hydraulic press can be widely applied to the processes of cutting, punching, blanking, bending, riveting, forming and the like, and parts are processed by applying strong pressure on metal blanks to enable metal to generate plastic deformation and fracture. The power unit of the hydraulic press is a hydraulic cylinder, a telescopic part of the hydraulic cylinder performs linear reciprocating motion relative to a cylinder body, and a terminal tool (such as a press head and the like) at the tail end of the telescopic part applies thrust to act on the metal blank. Under the condition that the pressure P of the hydraulic oil supplied to the hydraulic cylinder is kept unchanged, if the thrust of the end tool is to be increased, the piston action area of the hydraulic cylinder needs to be increased, and the hydraulic cylinder occupies a larger assembly space of the press machine.

Patent document CN108916134A discloses a multi-time force return oil-gas isolated gas-liquid pressure cylinder, which is connected in parallel with a plurality of driving cylinders, and the plurality of driving cylinders connected in parallel effectively increase the action area of a piston to the sum of the action areas of the piston, so as to achieve the effect of increasing the return force, but also increase the number of cylinders, and still cause the cylinders to occupy a larger assembly space.

Disclosure of Invention

The invention aims to provide a single-telescopic thrust multiplication hydraulic cylinder, which does not increase the number of hydraulic cylinders under the condition that the pressure of hydraulic oil supplied to the hydraulic cylinders is kept unchanged, and increases the piston action area of the hydraulic cylinders so as to improve the thrust of the hydraulic cylinders.

In order to achieve the above purpose, the technical solution adopted by the invention is as follows:

a single telescopic thrust multiplication hydraulic cylinder comprises a cylinder body, a plunger seat, a plunger sleeve, a piston cylinder, a first extending liquid path, a second extending liquid path and a retracting liquid path;

a plunger seat is assembled in the cylinder body and close to the lower end of the cylinder body, the lower end of a plunger sleeve is assembled on the plunger seat, the plunger sleeve is positioned in the cylinder body and is coaxially arranged with the cylinder body, and a piston is assembled at the upper end of the plunger sleeve;

the lower end of the piston cylinder extends into the cylinder body from the upper end of the cylinder body, the piston cylinder can linearly reciprocate relative to the cylinder body, the upper end of the plunger sleeve extends into the piston cylinder from the lower end of the piston cylinder, the piston is positioned in the piston cylinder, and the piston linearly reciprocates relative to the piston cylinder;

a first extending cavity is formed in the cylinder body and in a cavity between the lower end of the piston cylinder and the plunger seat, a second extending cavity is formed in the piston cylinder and in a cavity between the upper end of the piston cylinder and the piston, and a retracting cavity is formed in the piston cylinder and in a cavity between the lower end of the piston cylinder and the piston;

the first extending liquid path is connected with the first extending cavity, the second extending liquid path is connected with the second extending cavity, and the retracting liquid path is connected with the retracting cavity.

Further, a liquid outlet is formed in the cylinder body, a liquid injection cavity is formed in the cylinder body and in a cavity between the plunger seat and the lower end of the cylinder body, and the liquid outlet is communicated with the liquid injection cavity;

the first liquid extending path is arranged as a liquid extending through hole, the liquid extending through hole is arranged in the plunger seat, and the liquid injecting cavity and the first extending cavity are communicated through the liquid extending through hole;

the second stretches out the liquid way and sets up to stretching out and leads to the liquid pipe, stretches out to lead to the liquid pipe and sets up in the inside of plunger bushing, stretches out to lead to liquid pipe intercommunication and annotates liquid chamber and second and stretch out the chamber.

Further, a retraction liquid port is formed in the cylinder body, and the retraction liquid path is provided with a first retraction liquid through hole, a second retraction liquid through hole, a retraction liquid through gap and a third retraction liquid through hole which are sequentially communicated;

the first retracting liquid through hole is arranged in the plunger seat;

the second retraction liquid through hole is formed in the lower end of the plunger sleeve and penetrates through the side wall of the plunger sleeve;

two ends of the plunger sleeve are respectively assembled and blocked with the extending liquid through pipe, and a space between the extending liquid through pipe and the inner wall of the plunger sleeve forms a retracting liquid through clearance;

the third retraction liquid through hole is formed in the upper end of the plunger sleeve and penetrates through the side wall of the plunger sleeve;

the liquid withdrawing port is communicated with the liquid withdrawing cavity through a first liquid withdrawing and communicating pore passage, a second liquid withdrawing and communicating pore passage, a liquid withdrawing and communicating gap and a third liquid withdrawing and communicating pore passage in sequence.

Further, the liquid retracting opening, the first liquid retracting and communicating hole and the second liquid retracting and communicating hole are positioned on the same axis.

Further, the liquid pipe and the plunger sleeve are coaxially arranged.

Further, the cylinder body comprises a cylinder sleeve and a cylinder end cover, and the cylinder end cover is assembled at the lower end of the cylinder sleeve.

Furthermore, the cylinder body also comprises a first guide sleeve, the upper end of the cylinder sleeve is assembled with the first guide sleeve, and the piston cylinder is connected in the first guide sleeve in a sliding manner.

Furthermore, the upper end of cylinder liner is provided with the internal thread, and the outer wall of first uide bushing is provided with the external screw thread, the first uide bushing of upper end threaded connection of cylinder liner.

Furthermore, the piston cylinder comprises a piston sleeve and a second guide sleeve, the second guide sleeve is assembled at the lower end of the piston sleeve, and the piston sleeve is connected in the second guide sleeve in a sliding mode.

Furthermore, the piston cylinder also comprises a force application part, and the force application part is detachably connected with the upper end of the piston sleeve.

The beneficial technical effects of the invention are as follows:

the invention has reasonable design and compact structure, is beneficial to the miniaturization design of the cylinder body, and occupies less assembly; under the condition that the pressure intensity of hydraulic oil provided for the hydraulic cylinder is kept unchanged, the number of the hydraulic cylinders is not increased, the occupied assembly space is smaller, two extending cavities are formed by optimizing the design of oil cavities and are arranged in parallel, and the action area of a piston (a piston cylinder) of the hydraulic cylinder is increased so as to improve the thrust of the hydraulic cylinder; meanwhile, hydraulic oil is injected into the retraction liquid port, and the hydraulic cylinder can be retracted quickly.

Drawings

FIG. 1 is a first structural diagram illustrating an extended state of a single telescopic thrust multiplication hydraulic cylinder according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a second structure of the single telescopic thrust multiplication hydraulic cylinder in an extended state according to the embodiment of the invention, wherein the second structure indicates the flow direction of oil in the extended state;

FIG. 3 is a first structural diagram illustrating a retracted state of a single telescopic thrust multiplying hydraulic cylinder according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of the single telescopic thrust multiplication hydraulic cylinder in a retracted state according to the embodiment of the invention, and the diagram shows the oil flow direction in the retracted state.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.

Certain embodiments of the invention now will be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown. Indeed, various embodiments of the invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will satisfy applicable legal requirements.

In an embodiment of the present invention, a single telescopic thrust multiplication hydraulic cylinder is provided, as shown in fig. 1 to 4, including a cylinder body, a plunger seat 2, a plunger sleeve 22, a piston 31, a piston cylinder, a first extending liquid path, a second extending liquid path, a retracting liquid path, and the like.

The cylinder body comprises a cylinder sleeve 11, a cylinder end cover 12 and a first guide sleeve 13. The lower end of the cylinder liner 11 is provided with a cylinder end cover 12, and the upper end of the cylinder liner 11 is provided with a first guide sleeve 13. The upper end of the cylinder liner 11 is detachably connected with the first guide sleeve 13 so as to facilitate the assembly and disassembly of the piston sleeve 32 and the second guide sleeve 33 into and from the cylinder liner 11. Specifically, the upper end of the cylinder sleeve 11 is provided with an internal thread, the outer wall of the first guide sleeve 13 is provided with an external thread, and the upper end of the cylinder sleeve 11 is in threaded connection with the first guide sleeve 13.

A plunger seat 21 is assembled inside the cylinder liner 11 and near the lower end position of the cylinder liner 11. The lower end of the plunger sleeve 22 is assembled on the plunger seat 21, the plunger sleeve 22 is positioned inside the cylinder sleeve 11, the plunger sleeve 22 and the cylinder sleeve 11 are coaxially arranged, and the upper end of the plunger sleeve 22 is assembled with the piston 31.

The piston cylinder comprises a piston sleeve 32, a second guide sleeve 33 and a force application member 34, and the force application member 34 is used for assembling an end tool (such as a press head and the like). One end of the force application member 34 is detachably connected to the upper end of the piston sleeve 32, so that the piston 31 can be placed in the piston sleeve 32 and assembled to the piston sleeve 22 or the piston 31 can be detached from the piston sleeve 22 and taken out of the piston sleeve 32 after the force application member 34 is detached from the piston sleeve 32.

The lower end of the piston cylinder extends into the cylinder body (cylinder sleeve 11) from a first guide sleeve 13 at the upper end of the cylinder body, the piston cylinder is connected into the first guide sleeve 13 in a sliding mode, a dynamic sealing element is arranged between the first guide sleeve 13 and the outer wall of the piston cylinder to realize dynamic sealing between the first guide sleeve 13 and the piston cylinder, a dynamic sealing element is arranged between the lower end of the piston cylinder and the inner wall of the cylinder body to realize dynamic sealing between the lower end of the piston cylinder and the cylinder body, and the piston cylinder can move linearly and reciprocally relative to the cylinder body.

The lower end of the piston sleeve 32 is fitted with a second guide sleeve 33, and the plunger sleeve 22 is slidably coupled within the second guide sleeve 33.

The upper end of the plunger sleeve 22 extends into the piston cylinder (piston sleeve 32) from a second guide sleeve 33 at the lower end of the piston cylinder, the piston 31 is positioned in the piston cylinder (piston sleeve 32), a dynamic sealing element is arranged between the piston 31 and the inner wall of the piston sleeve 32 to realize dynamic sealing between the piston 31 and the piston sleeve 32, and the piston 31 linearly reciprocates relative to the piston cylinder.

The interior of the cylinder body and the cavity between the lower end second guide sleeve 33 of the piston cylinder and the plunger seat 21 form a first protruding cavity 41, the interior of the piston cylinder and the cavity between the upper end forcing piece 34 of the piston cylinder and the piston 31 form a second protruding cavity 42, and the interior of the piston cylinder and the cavity between the lower end second guide sleeve 33 of the piston cylinder and the piston 31 form a retracting cavity 43.

The first extension liquid path is connected to the first extension chamber 41, the second extension liquid path is connected to the second extension chamber 42, and the retraction liquid path is connected to the retraction chamber 43.

The cylinder liner 11 is provided with a liquid outlet 51, a liquid injection chamber 61 is formed in the cylinder body and in a cavity between the plunger seat 21 and the cylinder end cover 12 at the lower end of the cylinder body, and the liquid outlet 51 is communicated with the liquid injection chamber 61. The first liquid extending path is arranged to extend out of the liquid passing hole 62, the liquid passing hole 62 is arranged inside the plunger seat 21, and the liquid injecting cavity 61 and the first liquid extending cavity 41 are communicated through the liquid passing hole 62. The second extending liquid path is provided to extend a liquid through pipe 63, the extending liquid through pipe 63 is provided inside the plunger sleeve 22, the extending liquid through pipe 63 is arranged coaxially with the plunger sleeve 22, and the extending liquid through pipe 63 communicates the liquid injection chamber 61 and the second extending chamber 42.

The single telescopic thrust multiplication hydraulic cylinder of the embodiment integrates the first extending liquid path and the second extending liquid path in the cylinder body, so that the cylinder body is compact in structure and beneficial to the miniaturization design of the cylinder body.

The cylinder sleeve 11 is provided with a retraction liquid port 52, and a retraction liquid path is provided as a first retraction liquid through hole channel 71, a second retraction liquid through hole channel 72, a retraction liquid through gap 73 and a third retraction liquid through hole channel 74 which are communicated in sequence. The first retraction through-flow aperture 71 is provided inside the plunger seat 21. A second retraction well 72 is provided at the lower end of the plunger sleeve 22, the second retraction well 72 passing through the sidewall of the plunger sleeve 22. The plugs 8 are respectively arranged between the two ends of the plunger sleeve 22 and the extending liquid through pipe 63, and the space between the extending liquid through pipe 63 and the inner wall of the plunger sleeve 22 forms a retracting liquid through gap 73. A third retraction through-flow aperture 74 is provided at the upper end of the plunger sleeve 22 and a third retraction through-flow aperture 73 extends through the side wall of the plunger sleeve 22. The retract liquid port 52 communicates with the retract chamber 43 through a first retract liquid communication port 71, a second retract liquid communication port 72, a retract liquid communication gap 73, and a third retract liquid communication port 74 in that order.

The single telescopic thrust multiplication hydraulic cylinder of the embodiment is designed to form a retraction liquid passing gap 73 in the space between the extending liquid passing pipe 63 and the plunger sleeve 22 on the basis that the second extending liquid path is coaxially arranged in the plunger sleeve 22, so that the cylinder body structure is more compact, and the miniaturization design of the cylinder body is facilitated. Wherein, the liquid hole 52 that retracts, first retraction liquid channel 71 and the liquid channel 72 that leads to that retracts are located same vertical axis, have simplified the design that leads to the liquid channel, also make the cylinder body structure compacter, are favorable to the miniaturized design of cylinder body.

The extension and retraction processes of the single telescopic thrust multiplication hydraulic cylinder of the embodiment are as follows:

1. process of extending action

Hydraulic oil with pressure P is injected through the liquid outlet 51, the hydraulic oil enters the liquid injection cavity 61, a part of the hydraulic oil enters the first liquid outlet cavity 41 through the liquid through hole 62 and acts on the lower end of the piston cylinder to push the piston cylinder to move upwards (leftwards in the figure), and the area of the section of the lower end of the piston cylinder, except the section of the contour of the plunger sleeve 22, is S₁Then exert force F on the piston cylinder₁＝P·S₁(ii) a Another part of the hydraulic oil enters the second extending cavity 42 through the extending liquid pipe 63 to push the piston cylinder to move upwards (leftwards in the figure), and the cross-sectional area of the piston sleeve 32 is S₂Then force F is also applied to the piston cylinder₂＝P·S₂. In this manner, a resultant force F ═ F is applied to the piston cylinder (the urging member 34)₁+F₂And the thrust of the hydraulic cylinder is improved. At the same time, the hydraulic oil in the retraction chamber 43 is compressed and flows back to the retraction fluid port 52 through the third retraction fluid passage 74, the retraction fluid passage gap 73, the second retraction fluid passage 72, and the first retraction fluid passage 71.

2. Retraction movement process

Hydraulic oil is injected through the retraction fluid port 52, and enters the retraction cavity 43 through the first retraction fluid passage 71, the second retraction fluid passage 72, the retraction fluid passage gap 73 and the third retraction fluid passage 74 to push the piston cylinder to move downward (leftward in the drawing) rapidly, so that the hydraulic cylinder is retracted rapidly. At the same time, the hydraulic oil in the first protruding chamber 41 and the second protruding chamber 42 is compressed and collected to the liquid injection chamber 61 through the protruding liquid passage hole 62 and the protruding liquid passage tube 63, and continuously flows back to the protruding liquid port 51.

Up to this point, the present embodiment has been described in detail with reference to the accompanying drawings. From the above description, those skilled in the art should clearly recognize a single telescopic thrust multiplying hydraulic cylinder of the present invention. The invention has reasonable design and compact structure, is beneficial to the miniaturization design of the cylinder body, and occupies less assembly; under the condition that the pressure intensity of hydraulic oil provided for the hydraulic cylinder is kept unchanged, the number of the hydraulic cylinder is not increased, the occupied assembly space is smaller, two extending cavities (a first extending cavity 41 and a second extending cavity 42) are formed to be arranged in parallel by optimizing the design of an oil cavity, and the action area of a piston (a piston cylinder) of the hydraulic cylinder is increased to improve the thrust of the hydraulic cylinder; meanwhile, hydraulic oil is injected into the retraction liquid port 52, so that the hydraulic cylinder can be retracted quickly.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.