CN211144986U

CN211144986U - A piston rod dropout prevention means for combination cylinder

Info

Publication number: CN211144986U
Application number: CN201922294805.2U
Authority: CN
Inventors: 钱雪锋; 张文君
Original assignee: Shanghai Dunke Machinery Co ltd
Current assignee: Shanghai Dunke Machinery Co ltd
Priority date: 2019-12-19
Filing date: 2019-12-19
Publication date: 2020-07-31
Anticipated expiration: 2029-12-19

Abstract

The utility model discloses a piston rod anti-drop device for a combined oil cylinder, which is arranged in the oil cylinder and is used for preventing a piston rod arranged in the oil cylinder from dropping; the piston rod locking device comprises a spline groove and a locking mounting hole which are arranged on a piston rod, wherein the spline groove is clamped with a spline shaft and can be axially assembled in a sliding manner, and one end of the spline shaft, which penetrates out of the spline groove, is assembled and fixed with a piston of an oil cylinder; a choke plug, a pressure spring and a locking piece are arranged in the locking mounting hole, the choke plug and the locking mounting hole are assembled and fixed in a screwing mode through threads, two ends of the pressure spring are assembled and fixed with the pressure spring and the locking piece respectively, and the locking piece is clamped with the locking mounting hole and assembled in a sliding mode; the spline shaft is positioned at the position where the piston rod moves downwards to the maximum displacement and corresponds to the locking piece, and a stop groove is arranged at the position where the piston rod moves downwards to the maximum displacement and corresponds to the locking piece, and is clamped and assembled with the locking piece to relatively fix the piston rod in the axial direction. The utility model discloses a cooperation of pressure spring and locking piece has realized the spacing of piston rod with the dabber to the anticreep for the piston rod provides a heavy guarantee.

Description

A piston rod dropout prevention means for combination cylinder

Technical Field

The utility model relates to the field of machinary, especially, relate to hydraulic cylinder, especially a piston rod dropout prevention means for combination cylinder.

Background

Referring to fig. 1, in the prior art, in order to prevent a piston rod from falling, a pressure retaining valve 100 is added in a rod cavity, when an oil cylinder works, oil is injected into a cavity B, oil opens the pressure retaining valve 100 in the cavity a, so that the piston rod 210 can move downwards, a load 310 is arranged on the piston rod 210, and the piston rod 210 is mounted on a piston 230; when the oil injection into the B chamber is stopped, the piston rod 210 is stopped, and even if the oil in the a chamber acts on the pressure retaining valve 100, the opening is not performed, so that the piston rod does not fall off. This design also fails its function of preventing the piston rod 210 from falling when the pressure retaining valve is damaged, which is obviously not safe in some important situations.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned defects in the prior art, the technical problem to be solved in the present invention is to provide a piston rod anti-drop device for a combination cylinder.

In order to achieve the above object, the utility model provides a piston rod anti-drop device for a combined oil cylinder, which is installed in the oil cylinder and used for preventing a piston rod installed in the oil cylinder from dropping; the piston rod locking device comprises a spline groove and a locking mounting hole which are arranged on a piston rod, wherein the spline groove is clamped with a spline shaft and can be axially assembled in a sliding manner, and one end of the spline shaft, which penetrates out of the spline groove, is assembled and fixed with a piston of an oil cylinder;

a choke plug, a pressure spring and a locking piece are arranged in the locking mounting hole, the choke plug and the locking mounting hole are assembled and fixed in a screwing mode through threads, two ends of the pressure spring are assembled and fixed with the pressure spring and the locking piece respectively, and the locking piece is clamped with the locking mounting hole and assembled in a sliding mode; the spline shaft is positioned at the position where the piston rod moves downwards to the maximum displacement and corresponds to the locking piece, and a stop groove is arranged at the position where the piston rod moves downwards to the maximum displacement and corresponds to the locking piece, and is clamped and assembled with the locking piece to relatively fix the piston rod in the axial direction.

Preferably, the number of the locking mounting holes is at least three, the three locking mounting holes are uniformly distributed on the cross section of the piston rod at the same height, the same choke plug, the same pressure spring and the same locking piece are respectively mounted in each locking mounting hole, and the spline shaft is respectively provided with a stopping groove which is clamped and assembled with each locking piece.

Preferably, the locking member is a spherical steel ball.

Preferably, the locking member is a slider.

Preferably, the gas-liquid separator further comprises a locking mechanism, the locking mechanism comprises a gas tank for storing high-pressure gas, a gas outlet of the gas tank is communicated with one end of a valve cavity of the pressure valve through a first gas pipe, the other end of the valve cavity is communicated with a second gas pipe, a valve core is installed in the valve cavity in a clamping, sliding and sealing mode, a valve core spring is installed between the valve core and the top of the valve cavity, and the valve core spring is used for generating downward pressing elasticity on the valve core; the valve cavity is positioned at the bottom of the valve core and is communicated with the cavity A through an oil inlet pipe;

the other end of the second air pipe is communicated with one end of the air passage through a spring pipe, the other end of the air passage is communicated with the inner cavity, the inner cavity is arranged in the air bag, the air bag is arranged in the power groove, a clamping plate is fixed at the top of the air bag, a locking part is arranged on the clamping plate, the locking part is clamped and slidably arranged in a locking sliding groove, the locking sliding groove is communicated with the locking mounting hole and is positioned at the bottom of the locking mounting hole, and a plurality of locking bulges are arranged on the top; the locking piece bottom is provided with innumerable locking draw-in groove, and the locking draw-in groove can assemble with the protruding block of locking.

Preferably, the upper inner wall and the lower inner wall in the inner cavity are respectively assembled and fixed with two ends of a tension spring, and the tension spring is used for keeping the air bag in a contraction state.

Preferably, locking spout, power groove, air flue all set up on the piston rod, and still be provided with the scarce groove of stepping down on the piston rod, and the spring pipe is installed and is being stepped down in the scarce groove of stepping down.

The utility model has the advantages that:

the utility model discloses a cooperation of pressure spring and locking piece has realized the spacing of piston rod with the dabber to the anticreep for the piston rod provides a heavy guarantee. The anti-dropping device can replace a pressure retaining valve to realize the anti-dropping of the piston rod in a partial use scene, thereby reducing the whole volume and the cost.

Drawings

Fig. 1 is a schematic view of a prior art structure.

Fig. 2 is a schematic structural diagram of the present invention.

Fig. 3 is a sectional view a-a in fig. 2.

Fig. 4 is a schematic structural diagram of the locking mechanism of the present invention.

Detailed Description

The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention and the accompanying drawings.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Referring to fig. 2 to 3, a piston rod drop prevention apparatus for a combination cylinder is installed in a cylinder 220, and is used for preventing a piston rod 210 installed inside the cylinder 220 from dropping; the piston rod locking device comprises a spline groove 212 and a locking mounting hole 211 which are arranged on a piston rod 210, wherein the spline groove 212 is clamped with a spline shaft 240 and can be axially assembled in a sliding manner, and one end of the spline shaft 240, which penetrates out of the spline groove 212, is fixedly assembled with a piston 230 of an oil cylinder;

a choke plug 430, a pressure spring 410 and a locking piece 420 are arranged in the locking mounting hole 211, the choke plug 430 and the locking mounting hole 211 are assembled and fixed in a screwing mode through threads, two ends of the pressure spring 410 are respectively assembled and fixed with the pressure spring 410 and the locking piece 420, the locking piece 420 is clamped with the locking mounting hole 211 and can be assembled in a sliding mode, and the locking piece 420 can be completely arranged in the locking mounting hole 211;

the spline shaft 240 is provided with a stop groove 241 at a position where the piston rod 210 moves down to the maximum displacement, and the stop groove 241 is engaged with the locking member 420 to relatively fix the piston rod in the axial direction, thereby preventing the piston rod from falling off. In actual use, the piston rod 210 extends out of the cylinder 220 and is fixed to the load 310.

The locking member 420 is a spherical steel ball, and when the piston rod 210 moves down to the end position, the steel ball enters the stop groove 241 of the spline shaft and is clamped with the stop groove 241 by the elastic force provided by the pressure spring. Therefore, the steel ball can be pulled out of the stop groove only by a certain pulling force, and the piston rod 210 can fall off after the steel ball is separated from the stop groove. Therefore, when the oil cylinder is vertically installed, the piston rod and the load can be effectively prevented from falling off. The size of the stop groove needs to be matched with the steel ball, specifically, the stop groove is just in clamping assembly with the steel ball, and the specification of the pressure spring needs to be calculated according to the piston rod and the load capacity.

Preferably, in order to prevent the spline shaft from being unevenly stressed by one pressure spring, at least three locking mounting holes 211 may be provided, the three locking mounting holes 211 are uniformly distributed on the cross section of the same height of the piston rod, a same bulkhead, pressure spring and locking piece are respectively mounted in each locking mounting hole 211, and a stop groove 241 for being engaged with each locking piece is respectively provided on the spline shaft. Thus, the stability of the utility model can be ensured even under the vibration condition.

Referring to fig. 4, the structures of fig. 2-3 are only suitable for the case of small load, and the effect of the structures is very small for some heavy load usage environments. Especially, when the pressure in the cavity A is lower than the holding pressure (such as leakage), the piston rod cannot be prevented from falling off by the structure. Therefore, in consideration of heavy-load use, the applicant further adds a locking mechanism, wherein the locking mechanism comprises an air tank 510 storing high-pressure air, an air outlet of the air tank 510 is communicated with one end of a valve cavity 521 of the pressure valve 520 through a first air pipe 611, the other end of the valve cavity 521 is communicated with a second air pipe 612, a valve core 530 is clamped, slidably and hermetically installed in the valve cavity 521, a valve core spring 540 is installed between the valve core 530 and the top of the valve cavity, and the valve core spring 540 is used for generating downward-pressing elastic force on the valve core 530; the valve chamber 521 is located at the bottom of the valve core 530 and communicates with the chamber a through an oil inlet pipe 613. In use, the hydraulic pressure held by chamber a pushes the valve spool to hold the valve spool against the spring force of valve spool spring 540 to shut off communication between second air line 612 and the first air line. Once the hydraulic pressure of the a chamber is lower than the preset holding hydraulic pressure, the valve core spring 540 drives the valve core to move down by its own elastic force, so that the second air pipe 612 is communicated with the first air pipe, and the high-pressure air in the air tank 510 enters the second air pipe 612.

The other end of the second air pipe 612 is communicated with one end of the air passage 215 through a spring pipe 620, the other end of the air passage 215 is communicated with an inner cavity 561, the inner cavity 561 is arranged in an air bag 560, the air bag 560 is installed in a power groove 214, a clamping plate 550 is fixed at the top of the air bag 560, a locking part 551 is arranged on the clamping plate 550, the locking part 551 is clamped and slidably installed in a locking sliding groove 213, the locking sliding groove 213 is communicated with a locking installation hole 211 and is positioned at the bottom of the locking installation hole 211, and a plurality of locking protrusions 552 are arranged on the top surface;

the locking piece 420 is a sliding block, countless locking clamping grooves 421 are formed in the bottom of the locking piece 420, and the locking clamping grooves 421 can be assembled with the locking protrusions 522 in a clamping mode, so that the locking piece 420 can be clamped and fixed.

The upper and lower inner walls of the inner cavity 561 are respectively fixed to two ends of a tension spring 550, and the tension spring 550 is used for keeping the airbag 560 in a contracted state.

The locking sliding groove 213, the power groove 214 and the air passage 215 are all arranged on the piston rod 210, the piston rod 210 is further provided with a yielding notch 216, and the spring tube is arranged in the yielding notch 216.

After high-pressure draught got into the second trachea, can get into in the inner chamber of gasbag 560 to make the gasbag overcome the elasticity inflation of extension spring, just also promote cardboard 550 and shift up, make protruding 552 of locking and locking draw-in groove 421 chucking assembly, the fixed power of locking piece increases 5 times at least this moment, thereby can greatly increased locking piece deviate from the required pulling force in locking groove, thereby satisfy the service environment of heavy load. Of course, the design is mainly aimed at the lowest displacement of the piston rod, and once the pressure of the cavity A is lower, the clamping force between the locking piece and the spline shaft is increased by increasing the locking force of the locking piece. In the initial state, the locking projection is not engaged with the locking groove, and the structure shown in fig. 4 is in the initial state.

The details of the present invention are well known to those skilled in the art.

The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the teachings of the present invention without undue experimentation. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.

Claims

1. A piston rod anti-drop device for a combined oil cylinder is arranged in the oil cylinder and used for preventing a piston rod arranged in the oil cylinder from dropping; the method is characterized in that: the piston rod locking device comprises a spline groove and a locking mounting hole which are arranged on a piston rod, wherein the spline groove is clamped with a spline shaft and can be axially assembled in a sliding manner, and one end of the spline shaft, which penetrates out of the spline groove, is assembled and fixed with a piston of an oil cylinder;

2. The anti-drop device for the piston rod according to claim 1, wherein: the number of the locking mounting holes is at least three, the three locking mounting holes are uniformly distributed on the cross section of the piston rod at the same height, the same choke plug, the same pressure spring and the same locking piece are respectively installed in each locking mounting hole, and the spline shaft is respectively provided with a stopping groove which is clamped and assembled with each locking piece.

3. The drop preventing device for the piston rod as claimed in claim 1 or 2, wherein: the locking piece is a spherical steel ball.

4. The drop preventing device for the piston rod as claimed in claim 1 or 2, wherein: the locking piece is a sliding block.

5. The anti-drop device for the piston rod according to claim 4, wherein: the gas outlet of the gas tank is communicated with one end of a valve cavity of the pressure valve through a first gas pipe, the other end of the valve cavity is communicated with a second gas pipe, a valve core is installed in the valve cavity in a clamping, slidable and sealing mode, a valve core spring is installed between the valve core and the top of the valve cavity, and the valve core spring is used for generating downward pressing elasticity on the valve core; the valve cavity is positioned at the bottom of the valve core and is communicated with the cavity A through an oil inlet pipe;

6. The anti-drop device for the piston rod according to claim 5, wherein: and the upper inner wall and the lower inner wall in the inner cavity are respectively assembled and fixed with two ends of a tension spring, and the tension spring is used for keeping the air bag in a contraction state.

7. The anti-drop device for the piston rod according to claim 5, wherein: the locking sliding groove, the power groove and the air passage are all arranged on the piston rod, the piston rod is further provided with a yielding notch, and the spring tube is installed in the yielding notch.