阅读说明：本技术 内外联合机械式自锁液压缸 (Internal and external combined mechanical self-locking hydraulic cylinder ) 是由 霍元明 李云龙 于 2020-04-29 设计创作，主要内容包括：本发明涉及一种内外联合机械式自锁液压缸,包括缸体、滑动连接于所述缸体内的活塞、与所述活塞固定连接的活塞杆、设置于所述缸体内部的内自锁组件、设置于所述缸体外部的外自锁组件以及套设于所述外自锁组件上的壳体,所述壳体分别与所述缸体和所述外自锁组件相连接,所述活塞杆具有设置于其表面的齿部,所述外自锁组件包括齿轮以及与所述齿轮连接的齿轮制动器,所述齿轮与所述齿部相啮合,所述齿轮制动器连接于所述壳体上。本发明通过在液压缸内部与外部分别设置内自锁组件与外自锁组件,实现内外联合锁定液压缸,保证液压缸长时间工作位置的高精度与高可靠性。(The invention relates to an internal and external combined mechanical self-locking hydraulic cylinder which comprises a cylinder body, a piston rod, an internal self-locking assembly, an external self-locking assembly and a shell, wherein the piston is connected in the cylinder body in a sliding mode, the piston rod is fixedly connected with the piston, the internal self-locking assembly is arranged in the cylinder body, the external self-locking assembly is arranged outside the cylinder body, the shell is sleeved on the external self-locking assembly, the shell is respectively connected with the cylinder body and the external self-locking assembly, the piston rod is provided with a tooth part arranged on the surface of the piston rod, the external self-locking assembly comprises a gear and a gear brake connected with the gear, the. According to the invention, the internal self-locking assembly and the external self-locking assembly are respectively arranged inside and outside the hydraulic cylinder, so that the hydraulic cylinder is locked in an internal and external combined manner, and the high precision and the high reliability of the long-time working position of the hydraulic cylinder are ensured.)

1. The utility model provides an inside and outside combined mechanical type auto-lock pneumatic cylinder which characterized in that: the piston rod comprises a cylinder body, a piston which is slidably connected into the cylinder body, a piston rod which is fixedly connected with the piston, an inner self-locking assembly which is arranged inside the cylinder body, an outer self-locking assembly which is arranged outside the cylinder body and a shell which is sleeved on the outer self-locking assembly, wherein the shell is respectively connected with the cylinder body and the outer self-locking assembly, the piston rod is provided with a tooth part which is arranged on the surface of the piston rod, the outer self-locking assembly comprises a gear and a gear brake which is connected with the gear, the gear is meshed with the tooth part, and the gear brake is connected onto the shell.

2. The internal-external combined mechanical self-locking hydraulic cylinder as claimed in claim 1, characterized in that: gear brake is including being located respectively the first fixed block and the second fixed block of gear both sides, being located the shift fork of second fixed block side, set up in the clutch of shift fork side, set up in electro-magnet on the shift fork, with the backup pad that the shift fork is connected and set up in permanent magnet in the backup pad, the permanent magnet set up in the below of electro-magnet, the electro-magnet is connected with the solenoid valve.

3. The internal-external combined mechanical self-locking hydraulic cylinder as claimed in claim 2, characterized in that: the shift fork includes the vertical portion of shift fork and the horizontal portion of shift fork, the tip of the vertical portion of shift fork set up in the clutch with between the second fixed block, backup pad transverse connection in on the vertical portion of shift fork and be located the horizontal portion below of shift fork, the electro-magnet set up in the tip of the horizontal portion of shift fork.

4. The internal-external combined mechanical self-locking hydraulic cylinder as claimed in claim 1, characterized in that: the cylinder body is provided with an accommodating cavity and an unlocking channel, the piston rod is provided with a self-locking groove formed by inwards sinking from the surface of the piston rod, the inner self-locking assembly comprises a spring connected with the cylinder body and a self-locking column connected with the spring, the spring is tightly pressed in the accommodating cavity, the self-locking column and the accommodating cavity form a cavity, and the cavity is communicated with the unlocking channel.

5. The internal-external combined mechanical self-locking hydraulic cylinder as claimed in claim 4, characterized in that: the piston rod comprises a first section of the piston rod and a second section of the piston rod, the first section of the piston rod is located inside the cylinder body, the second section of the piston rod is located outside the cylinder body and penetrates through the shell, the self-locking groove is formed in the first section of the piston rod, and the tooth portion is formed in the second section of the piston rod.

6. The internal-external combined mechanical self-locking hydraulic cylinder as claimed in claim 4, characterized in that: the cylinder body comprises a cylinder body and a cylinder body rear cover connected with the cylinder body, the height of the cylinder body rear cover is larger than that of the cylinder body, a mounting hole is formed in the cylinder body rear cover, the shell is connected with the cylinder body rear cover through the mounting hole, and the cylinder body is provided with the accommodating cavity and the unlocking channel.

7. The internal-external combined mechanical self-locking hydraulic cylinder as claimed in claim 5, wherein: the internal and external combined mechanical self-locking hydraulic cylinder is provided with a pair of internal self-locking components and a pair of external self-locking components, the first section of the piston rod is provided with a pair of symmetrical self-locking grooves, and the second section of the piston rod is provided with a pair of symmetrical teeth parts.

Technical Field

The invention relates to the technical field of hydraulic equipment, in particular to an internal and external combined mechanical self-locking hydraulic cylinder.

Background

The hydraulic transmission has large power density, easy realization of stepless speed regulation, standardization and high automation degree, and is widely applied to various occasions such as agricultural machinery, engineering machinery, aerospace and the like. The hydraulic cylinder is an important element widely applied to the modern industrial hydraulic industry, is a hydraulic actuating element which converts hydraulic energy into mechanical energy and makes linear reciprocating motion (or swinging motion), and has simple structure and reliable operation. When the reciprocating motion is realized by the hydraulic cylinder, a speed reducing device can be omitted, no transmission gap exists, and the motion is stable, so that the hydraulic cylinder is widely applied to hydraulic systems of various machines.

When the hydraulic cylinder works, after a piston rod of the hydraulic cylinder extends out, the piston rod needs to stably work at the current position, and the piston rod can neither extend out nor retract, namely, the self-locking is generally known.

Chinese patent CN102032238A discloses an external control type self-locking hydraulic cylinder, which comprises a cylinder body and a piston rod assembly arranged in the cylinder body and capable of freely moving; the locking device is characterized in that a locking piston is arranged in a locking cylinder barrel, and the locking piston divides the locking cylinder barrel into an unlocking oil cavity and a locking oil cavity; the unlocking oil cavity is used for inputting and outputting hydraulic oil through an unlocking oil cavity oil port on the locking cylinder barrel, and the locking oil cavity is used for inputting and outputting the hydraulic oil through a locking oil cavity oil port on the locking cylinder barrel; a large spring is arranged in the locking oil cavity; an inner hole is formed in the center of the locking piston, and a small spring and a sliding sleeve are arranged in the inner hole; 4-8 annular grooves are formed in the inner wall of the inner hole of the locking piston; the left side of the cylinder body is provided with a thin-wall sleeve, round holes are radially formed in the thin-wall sleeve, and a steel ball is arranged in each round hole; an annular groove is arranged on the step surface on the left side of the piston rod assembly. However, the hydraulic cylinder has the problems that the hydraulic cylinder is easy to leak and inconvenient to maintain due to the fact that oil passages are increased, when the hydraulic cylinder works for a long time, oil leakage is easy to generate, and the accuracy of the working position of the hydraulic cylinder is difficult to guarantee.

Therefore, it is necessary to provide a new internal and external combined mechanical self-locking hydraulic cylinder to solve the above problems.

Disclosure of Invention

The invention aims to provide an internal and external combined mechanical self-locking hydraulic cylinder, which can ensure the position accuracy of the hydraulic cylinder during long-time working.

In order to achieve the purpose, the invention adopts a technical scheme that: the utility model provides an inside and outside combined mechanical type auto-lock pneumatic cylinder, its include the cylinder body, sliding connection in piston in the cylinder body, with piston fixed connection's piston rod, set up in inside auto-lock subassembly of cylinder body, set up in outside auto-lock subassembly and the cover of cylinder body are located casing on the outside auto-lock subassembly, the casing respectively with the cylinder body with outside auto-lock subassembly is connected, the piston rod has the tooth portion that sets up in its surface, outside auto-lock subassembly include the gear and with gear brake that gear connection, the gear with tooth portion meshes mutually, gear brake connect in on the casing.

Gear brake is including being located respectively the first fixed block and the second fixed block of gear both sides, being located the shift fork of second fixed block side, set up in the clutch of shift fork side, set up in electro-magnet on the shift fork, with the backup pad that the shift fork is connected and set up in permanent magnet in the backup pad, the permanent magnet set up in the below of electro-magnet, the electro-magnet is connected with the solenoid valve.

The shift fork includes the vertical portion of shift fork and the horizontal portion of shift fork, the tip of the vertical portion of shift fork set up in the clutch with between the second fixed block, backup pad transverse connection in on the vertical portion of shift fork and be located the horizontal portion below of shift fork, the electro-magnet set up in the tip of the horizontal portion of shift fork.

The cylinder body is provided with an accommodating cavity and an unlocking channel, the piston rod is provided with a self-locking groove formed by inwards sinking from the surface of the piston rod, the inner self-locking assembly comprises a spring connected with the cylinder body and a self-locking column connected with the spring, the spring is tightly pressed in the accommodating cavity, the self-locking column and the accommodating cavity form a cavity, and the cavity is communicated with the unlocking channel.

The piston rod comprises a first section of the piston rod and a second section of the piston rod, the first section of the piston rod is located inside the cylinder body, the second section of the piston rod is located outside the cylinder body and penetrates through the shell, the self-locking groove is formed in the first section of the piston rod, and the tooth portion is formed in the second section of the piston rod.

The cylinder body comprises a cylinder body and a cylinder body rear cover connected with the cylinder body, the height of the cylinder body rear cover is larger than that of the cylinder body, a mounting hole is formed in the cylinder body rear cover, the shell is connected with the cylinder body rear cover through the mounting hole, and the cylinder body is provided with the accommodating cavity and the unlocking channel.

The internal and external combined mechanical self-locking hydraulic cylinder is provided with a pair of internal self-locking components and a pair of external self-locking components, the first section of the piston rod is provided with a pair of symmetrical self-locking grooves, and the second section of the piston rod is provided with a pair of symmetrical teeth parts.

Compared with the prior art, the internal and external combined mechanical self-locking hydraulic cylinder has the beneficial effects that:

1. the piston rod locking and unlocking mechanism is provided with an inner self-locking assembly and an outer self-locking assembly which can lock and unlock the piston rod;

2. the piston rod is equipped with tooth portion, outer auto-lock subassembly includes gear and gear brake, the gear meshes with tooth portion mutually, utilize the gear to realize the restraint to the piston rod motion, and realize the locking to the gear through gear brake, and then realize the function of locking the piston rod, moreover, the steam cylinder operating position is accurate, can lock for a long time, and under the condition that oil circuit trouble or interior auto-lock subassembly are malfunctioning, the effect of locking the piston rod also can be undertaken alone to outer auto-lock subassembly, guarantee the long-time job stabilization nature of pneumatic cylinder.

3. The gear is locked through the electromagnetic control type clutch, so that the function of locking the piston rod is realized, and automatic control is realized.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:

FIG. 1 is a schematic view of an internal and external combined mechanical self-locking hydraulic cylinder of the present invention;

FIG. 2 is an enlarged schematic view of portion A of the present invention;

fig. 3 is a schematic view of the external self-locking assembly of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 3, the present invention provides an internal and external combined mechanical self-locking hydraulic cylinder, which includes a cylinder body 1, a piston 2 slidably connected in the cylinder body 1, a piston rod 3 fixedly connected to the piston 2, an internal self-locking assembly 4 disposed inside the cylinder body 1, an external self-locking assembly 5 disposed outside the cylinder body 2, and a housing 6 sleeved on the external self-locking assembly 5, wherein the housing 6 is respectively connected to the cylinder body 2 and the external self-locking assembly 5. The inner self-locking assembly 4 and the outer self-locking assembly 5 can lock and unlock the piston rod 3.

Referring to fig. 1, the cylinder 1 includes a cylinder body 11 and a cylinder rear cover 12 connected to the cylinder body 11, the cylinder rear cover 12 has a height greater than that of the cylinder body 11, the cylinder rear cover 12 is provided with a mounting hole 121, and the housing 6 can be connected to the cylinder 2 by inserting a bolt into the mounting hole 121. The cylinder body 11 is provided with an accommodating cavity 111 and an unlocking passage 112.

The piston rod 3 is provided with a self-locking groove 31 formed by inwards sinking the surface of the piston rod and a tooth part 32 arranged on the surface of the piston rod, the piston rod 3 comprises a first piston rod section 33 and a second piston rod section 34, the first piston rod section 33 is positioned in the cylinder body 1, the second piston rod section 34 is positioned outside the cylinder body 1 and penetrates through the shell 6, the self-locking groove 31 is arranged on the first piston rod section 33, and the tooth part 32 is arranged on the second piston rod section 34. In this example, a pair of symmetrical self-locking grooves 31 are provided on the first piston rod section 33 and a pair of symmetrical teeth 32 are provided on the second piston rod section 34.

Referring to fig. 1 and 2, the internal self-locking assembly 4 includes a spring 41 connected to the cylinder 1 and a self-locking post 42 connected to the spring 41, the spring 41 is compressed in the accommodating cavity 111, the self-locking post 42 and the accommodating cavity 111 form a cavity 43, and the cavity 43 is communicated with the unlocking passage 112. In this example, a pair of internal self-locking assemblies 4 is provided, which is matched with the pair of self-locking grooves 31, when the piston rod 3 is in a free state, the self-locking columns 42 are tightly attached to the surface of the piston rod 3, when the piston rod 3 moves to a set position, the self-locking columns 42 are clamped into the self-locking grooves 31 under the action of the springs 41, so that the piston rod 3 is locked, when unlocking is needed, hydraulic oil is injected into the unlocking channel 112, the hydraulic oil flows into the cavities 43, when the pressure generated by the hydraulic oil is greater than the elastic force of the springs 41, the self-locking columns 42 rise, and move out of the self-locking grooves 31, so that the piston rod 3 is in a free state. The pair of inner self-locking assemblies 4 and the pair of self-locking grooves 31 are arranged, so that the piston rod 3 can be locked and unlocked symmetrically from the upper side and the lower side, and the stability of the piston rod during movement is enhanced.

Referring to fig. 1 and 3, the external self-locking assembly 5 includes a gear 51 and a gear brake 52 connected to the gear 51, the gear 51 is engaged with the teeth 32, the gear brake 52 is connected to the housing 6, and the gear brake 52 locks or unlocks the gear 51, and thus the piston rod 3 or unlocks the piston rod 3. Utilize the gear to realize the restraint to the piston rod motion to realize the locking to the gear through gear brake, and then realize the function of locking the piston rod, simple structure, safe and reliable, pneumatic cylinder operating position is accurate, can lock for a long time. And under the condition that an oil way fault occurs or the inner self-locking assembly 4 fails, the outer self-locking assembly 5 can also independently play a role in locking the piston rod 3, so that the working stability of the hydraulic cylinder is ensured.

The gear brake 52 includes a first fixed block 521 and a second fixed block 522 respectively located at both sides of the gear 51, a shifting fork 523 located at a side of the second fixed block 522, a clutch 524 disposed at a side of the shifting fork 523, an electromagnet 525 disposed on the shifting fork 523, a support plate 526 connected to the shifting fork 523, and a permanent magnet 527 disposed on the support plate 526, wherein the permanent magnet 527 is disposed below the electromagnet 525. The electromagnet 525 is connected with an electromagnetic valve (not shown), the electromagnetic valve is opened, the electromagnet 525 is electrified, and the shifting fork 523 is pushed to rotate under the action of repulsion of the same grade of the permanent magnet 527, so that the clutch 524 is separated, the gear 51 is unlocked, and the piston rod 3 can freely move; the electromagnet 525 is powered off, the shifting fork 523 returns to the original position under the action of the magnetic attraction force of the permanent magnet 527, the clutch 524 is pushed to be meshed, the gear 51 is locked, and the piston rod 3 is further locked. The gear is locked through the electromagnetic control type clutch, so that the function of locking the piston rod is realized, and automatic control is realized.

The shift fork 523 includes a shift fork vertical portion 5231 and a shift fork lateral portion 5232, an end of the shift fork vertical portion 5231 is disposed between the clutch 524 and the second fixed block 522, the support plate 526 is transversely connected to the shift fork vertical portion 5231 and located below the shift fork lateral portion 5232, and the electromagnet 525 is disposed at an end of the shift fork lateral portion 5232. Reasonable in design, compact structure.

Referring to fig. 1 and 3, the working principle of the present invention is: when locking is needed, the self-locking column 42 is clamped into the self-locking groove 31 under the action of the spring 41, so that the piston rod 3 is locked, meanwhile, the gear brake 52 locks the gear 51, further the piston rod 3 is locked, and the piston rod 3 is locked by the inner and outer combination; when the unlocking is needed, hydraulic oil is injected into the unlocking channel 112, the self-locking column 42 rises under the action of the hydraulic oil and moves out of the self-locking groove 31, so that the piston rod 3 is unlocked, meanwhile, the gear brake 52 unlocks the gear 51, further unlocks the piston rod 3, and the piston rod 3 is unlocked in an internal-external combined mode.

The hydraulic cylinder is provided with the inner self-locking assembly and the outer self-locking assembly respectively inside and outside the hydraulic cylinder, so that the hydraulic cylinder is locked in an inner and outer combined mode, high precision and high reliability of long-time working positions of the hydraulic cylinder are guaranteed, the inner self-locking assembly occupies small space and cannot influence parts inside the hydraulic cylinder completely, the outer self-locking assembly is designed outside the hydraulic cylinder and is not limited by the inner space of the hydraulic cylinder, the transportability of the outer self-locking assembly is good, and the outer self-locking assembly and a shell can be installed on any hydraulic cylinder with a piston rod with a tooth.

Of course, those skilled in the art will recognize that the above-described embodiments are illustrative only, and not intended to be limiting, and that changes and modifications may be made thereto without departing from the spirit and scope of the invention as defined by the appended claims.