CN216200070U

CN216200070U - Slow return nitrogen spring

Info

Publication number: CN216200070U
Application number: CN202122539074.0U
Authority: CN
Inventors: 张晓东; 成扬; 龚仕华; 张海铭
Original assignee: Chongqing Telipuer Machinery Equipment Co ltd
Current assignee: Chongqing Telipuer Machinery Equipment Co ltd
Priority date: 2021-10-21
Filing date: 2021-10-21
Publication date: 2022-04-05
Anticipated expiration: 2031-10-21

Abstract

The utility model discloses a slow return nitrogen spring, which comprises a cylinder body, a lining and a piston rod, wherein a cushion block and a piston body are arranged at the lower end of the piston rod, the cushion block is positioned above the piston body, a vent hole is formed in the cushion block, an inner sealing ring is arranged between the inner wall of the piston body and the piston rod, an outer sealing ring is arranged between the outer wall of the piston body and the inner wall of the cylinder body, a plurality of mounting holes communicated with chambers at the upper side and the lower side of the piston body are formed in the piston body, a flow limiting valve is arranged in at least one mounting hole, one-way valves are arranged in the rest mounting holes, and the one-way valves are used for realizing one-way communication from the chamber at the lower side of the piston body to the chamber at the upper side of the piston body. The remarkable effects are as follows: the structure is more reasonable, and the processing and the installation of being more convenient for not only greatly save on raw and other materials, the effectual process time that has saved simultaneously has promoted machining efficiency, the part of change damage that also can be convenient in later maintenance reaches the purpose that reduces later maintenance cost.

Description

Slow return nitrogen spring

Technical Field

The utility model relates to the technical field of nitrogen springs, in particular to a slow return nitrogen spring.

Background

At present, nitrogen springs are widely applied to the fields of automobile molds, household appliance molds, electronic molds and the like. The nitrogen spring is a novel elastic component using high-pressure nitrogen as a working medium, in the structural design of the nitrogen spring, a piston rod is related to acting force exerted on the piston rod during return stroke, if the piston rod can not slowly return stroke away from the exerted acting force, the piston rod can not be used on certain dies with buffering requirements, and the working power of a press can be increased instead, and the pressure of the spring is overcome to do work.

Therefore, chinese patent CN201920875716.4 proposes a slow return nitrogen spring, which is provided with a check valve and a flow control valve inside the piston ring of the piston rod to control the circulation of nitrogen between the air chambers on the upper and lower sides of the piston ring, thereby realizing the slow return of the nitrogen spring.

However, the above patent has the disadvantages of great waste of raw materials of the piston rod, great processing difficulty in the use environment of the long piston rod, low processing efficiency, high later maintenance cost and the like.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model aims to provide a slow return nitrogen spring, so that the processing difficulty can be reduced, the raw materials can be saved, and the later maintenance cost can be reduced.

In order to achieve the purpose, the technical scheme adopted by the utility model is as follows:

the key point of the slow return nitrogen spring is as follows: the piston rod comprises a cylinder body, a lining and a piston rod, wherein a cushion block and a piston body are installed at the lower end of the piston rod, the cushion block is located above the piston body, vent holes are formed in the cushion block, an inner sealing ring is arranged between the inner wall of the piston body and the piston rod, an outer sealing ring is arranged between the outer wall of the piston body and the inner wall of the cylinder body, a plurality of mounting holes for communicating chambers on the upper side and the lower side of the piston body are formed in the piston body, a flow limiting valve is arranged in at least one mounting hole, a check valve is arranged in the rest mounting holes, and the check valve is used for achieving one-way communication from the lower side chamber of the piston body to the upper side chamber of the piston body.

Further, the lower extreme of piston rod is formed with the installation department, is formed with first draw-in groove between piston rod and installation department, the cushion card is established in the first draw-in groove between piston rod and the piston body, second draw-in groove and third draw-in groove have been seted up to last down in proper order to the installation department from last, the piston body cover is established in the top of second draw-in groove and third draw-in groove set up in the second draw-in groove the third draw-in groove is equipped with and is used for realizing piston rod and piston body fixed connection's jump ring.

Furthermore, the upper side and the lower side of the cushion block are provided with vent grooves which are used for communicating all the vent holes.

Further, the outer diameter of the cushion block is consistent with the inner diameter of the cylinder body.

Further, the cushion block is composed of two half bodies with the same structure.

Furthermore, the upper part of the cylinder body is provided with a pressure relief hole, the pressure relief hole is positioned below the bushing, and the pressure relief hole is internally provided with a sealing screw.

The utility model has the following remarkable effects: simple structure, the modern design adopts piston rod and piston body to process the mode of back equipment for the piston rod assembly respectively, compares in integral type structure, and the structure is more reasonable, and the processing and the installation of being more convenient for not only are very saved on raw and other materials, and the effectual process time that has saved has simultaneously promoted machining efficiency, the part of change damage that also can be convenient in later maintenance reaches the purpose that reduces later maintenance cost.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a partially enlarged schematic view of A in FIG. 1

FIG. 3 is a schematic view of the fitting structure of the piston rod, the cushion block and the piston body according to the present invention;

fig. 4 is a schematic view of the piston rod according to the present invention.

Detailed Description

The following provides a more detailed description of the embodiments and the operation of the present invention with reference to the accompanying drawings.

As shown in fig. 1-3, a slow return nitrogen spring comprises a cylinder body 1, a bushing 2 fixed on the upper part of the cylinder body 1, and a piston rod 3 in the limiting installation and bushing 2, wherein a sealing component a is arranged between the cylinder body 1 and the bushing 2 and between the bushing 2 and the piston rod 3, a cushion block 4 and a piston body 5 are arranged at the lower end of the piston rod 3, the cushion block 4 is positioned above the piston body 5, a vent hole 6 is arranged on the cushion block 4, an inner sealing ring 7 is arranged between the inner wall of the piston body 5 and the piston rod 3, an outer sealing ring 8 is arranged between the outer wall of the inner sealing ring and the inner wall of the cylinder body 1, a plurality of mounting holes 9 communicating chambers at the upper side and the lower side of the piston body 5 are arranged on the piston body 5, a flow limiting valve 10 is arranged in one of the mounting holes 9, a one-way valve 11 is arranged in the other mounting holes 9, and a sealing element is arranged between the flow limiting valve 10, the one-way valve 11 and the inner wall of the mounting holes 9, and the check valve 11 is used for realizing one-way communication from the lower chamber of the piston body 5 to the upper chamber of the piston body 5.

Referring to fig. 4, an installation part 31 is formed at the lower end of the piston rod 3, a first clamping groove 32 is formed between the installation part 31 and the piston rod 3, the cushion block 4 is clamped in the first clamping groove 32 between the piston rod 3 and the piston body 5, a second clamping groove 33 and a third clamping groove 34 are sequentially formed in the installation part 31 from top to bottom, the piston body 5 is sleeved above the second clamping groove 33 and the third clamping groove 34, the inner sealing ring 7 is arranged in the second clamping groove 33, and the clamping spring 12 for fixedly connecting the piston rod 3 and the piston body 5 is arranged in the third clamping groove 34. During installation, the inner sealing ring 7 is installed firstly, then the piston body 5 is installed and moved to the first clamping groove 32, then the clamp spring is installed in the third clamping groove, then the piston body 5 is moved downwards to the positions above the second clamping groove 33 and the third clamping groove 34, and finally the cushion block 4 is clamped in the first clamping groove 32 between the rest piston bodies 5 of the piston rod 3.

Preferably, the upper side and the lower side of the cushion block 4 are provided with vent grooves 41 for communicating all the vent holes 6, through the arrangement of the vent grooves, enough vent channels can be formed between the lower surface of the cushion block 4 and the upper surface of the piston body 5, nitrogen below the piston body 5 can smoothly enter the vent holes 6 through the check valve 11 and the vent grooves 41 and then enter the upper cavity, even if a certain vent hole 6 is blocked by the vent grooves 41, the communication between the upper cavity and the lower cavity can be realized, and the reliability of the nitrogen spring in the embodiment is greatly improved.

Further, the outer diameter of the cushion block 4 is consistent with the inner diameter of the cylinder body 1, so that the cushion block 4 can be well limited by the inner wall of the cylinder body 1, and the piston body 5 is prevented from falling off in the up-and-down moving process of the piston body 5 to prevent the piston body 5 from being well fixed.

In this embodiment, the cushion block 4 is composed of two half bodies with the same structure, and after the piston body 5 is fixed by the snap spring, the cushion block 4 composed of the two half bodies is clamped between the piston rod 3 and the piston body 5, so that the piston body 5 is well installed and fixed on the installation part 31 by matching with the snap spring, and the installation process of the piston body 5 is further simplified.

In order to facilitate maintenance, a pressure relief hole 13 is formed in the upper portion of the cylinder body 1, the pressure relief hole 13 is located below the lining 2, and a sealing screw is installed in the pressure relief hole 13, so that pressure relief treatment can be performed on a cavity above the piston body 5 by unscrewing the sealing screw during later maintenance, the nitrogen spring can be smoothly disassembled, and the maintenance process can be smoothly performed.

In the process of pressing down the mold, the piston rod 3 moves downwards, nitrogen in the cavity below the piston body 5 enters the cavity above the piston body from the check valve 11, the nitrogen in the cavity below the whole piston body 5 is compressed, the air pressure is increased, and the pressure of the piston rod 3 is increased until the nitrogen spring is compressed to a set position of the mold;

in the process of returning the mold, the mold leaves the nitrogen spring, the upward pressure borne by the piston rod 3 is greater than the downward pressure, and the piston rod 3 and the piston body 5 move upwards; the upward speed of the piston is controlled by the size of the flow-limiting valve 10 in the process.

This embodiment nitrogen gas spring adopts piston rod and piston body to process the mode of back equipment for the piston rod assembly respectively, compares in integral type structure, and the structure is more reasonable, and the processing and the installation of being more convenient for not only are very saved on raw and other materials, and the effectual process time that has saved has promoted machining efficiency simultaneously, and the part of change damage that also can be convenient reaches the purpose that reduces the later maintenance cost in the later maintenance.

The technical solution provided by the present invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims

1. The utility model provides a slow return stroke nitrogen gas spring, includes cylinder body, bush and piston rod, its characterized in that: the piston rod is characterized in that a cushion block and a piston body are installed at the lower end of the piston rod, the cushion block is located above the piston body, vent holes are formed in the cushion block, an inner sealing ring is arranged between the inner wall of the piston body and the piston rod, an outer sealing ring is arranged between the outer wall of the piston body and the inner wall of the cylinder body, a plurality of mounting holes communicated with chambers on the upper side and the lower side of the piston body are formed in the piston body, a flow limiting valve is installed in at least one mounting hole, one-way valves are installed in the rest mounting holes, and the one-way valves are used for achieving one-way communication from the chamber on the lower side of the piston body to the chamber on the upper side of the piston body.

2. The slow-return nitrogen spring of claim 1, wherein: the lower extreme of piston rod is formed with the installation department, is formed with first draw-in groove between piston rod and installation department, the cushion card is established in the first draw-in groove between piston rod and the piston body, second draw-in groove and third draw-in groove have been seted up to down in proper order from last to the installation department, the piston body cover is established in the top of second draw-in groove and third draw-in groove set up in the second draw-in groove the interior sealing washer third draw-in groove is equipped with and is used for realizing piston rod and piston body fixed connection's jump ring.

3. The slow-return nitrogen spring of claim 1, wherein: and the upper side and the lower side of the cushion block are respectively provided with a vent groove which is used for communicating all the vent holes.

4. The slow-return nitrogen spring of claim 1, wherein: the outer diameter of the cushion block is consistent with the inner diameter of the cylinder body.

5. The slow return nitrogen spring according to any one of claims 1 to 4, wherein: the cushion block is composed of two half bodies with the same structure.

6. The slow-return nitrogen spring of claim 1, wherein: the upper part of the cylinder body is provided with a pressure relief hole, the pressure relief hole is positioned below the bushing, and a sealing screw is arranged in the pressure relief hole.