CN209705152U - A piston spring blocking mechanism - Google Patents

Abstract

The utility model discloses a kind of piston spring retarding mechanisms, it include: cylinder barrel and piston rod, one end of piston rod is protruded into cylinder barrel, spacing block is additionally provided in cylinder barrel, the end that piston rod protrudes into one end of cylinder barrel is further fixed on piston head, the outer rim of piston head is mutually agreed with inner wall of cylinder, centre bore is formed in the middle part of piston head, a sliding valve core is further fixed on the end alignment centre bore of piston rod and end face, the end that sliding valve core is located remotely from piston rod side is molded into the capping agreed with center hole end surface, the cross section of piston head towards the side of piston rod is trapezoidal, the through-hole for extending to centre bore is also provided on the side wall of the trapezoidal side of piston head.The utility model greatly reduces stretching force, and then the difference between maximum compression power and stretching force.

Description

A piston spring blocking mechanism

technical field

The utility model relates to the technical field of gas springs, in particular to a piston spring blocking mechanism.

Background technique

The external output characteristics of ordinary compressed gas springs are to provide load lifting force, and the friction force is hoped to be as small as possible. In some applications, it is desired that the difference between the compression force and the extension force be large enough, and even the extension force is expected to be negative.

Utility model content

The purpose of this utility model is to provide a piston spring blocking mechanism to solve the problems raised in the above-mentioned background technology.

In order to achieve the above object, the utility model provides the following technical solutions: a piston spring retarding mechanism, comprising: a cylinder and a piston rod, one end of the piston rod extends into the cylinder, a spacer is also arranged in the cylinder, the piston rod The end of one end extending into the cylinder is also fixed with a piston head, the outer edge of the piston head matches the inner wall of the cylinder, the middle of the piston head is formed with a center hole, and the end of the piston rod is aligned with the center hole and fixed There is a sliding spool, the end of the sliding spool located away from the piston rod is formed into a cover that fits the end face of the central hole, the cross section of the side of the piston head facing the piston rod is trapezoidal, and the side of the piston head is trapezoidal There is also a through hole extending to the center hole on the side wall, the sliding valve core is located in the center hole and a compression spring is sleeved, and a sealing ring is fixed on the inner wall of the center hole, and the sealing ring is close to the sliding valve core. of the outer wall.

As a preference, high-pressure nitrogen and oil are injected into the cylinder, and the cylinder is divided into an oil cavity and an air cavity by the isolation block. The side of the isolation block close to the piston rod is the oil cavity, and the side of the isolation block away from the piston rod is the gas cavity. cavity.

Preferably, a gasket ring groove is formed on the outer wall of the piston head away from the piston rod, and a gasket ring is arranged in the gasket ring groove.

Preferably, a through groove is formed on the outer wall of the piston head away from the piston rod, and the through groove communicates with the gasket ring groove and the end surface of the piston head away from the piston rod.

Preferably, a pressure balance hole is formed on the end surface of the piston head facing the piston rod, and the pressure balance hole extends into the gasket ring groove.

Compared with the prior art, the beneficial effect of the utility model is: the central hole of the piston head of the utility model forms a valve cavity, the end of the piston rod is provided with a compression spring and a sliding valve core, and there is a sealing ring outside the sliding valve core, so that During the compression action, the oil enters the rod cavity from the rodless cavity through the outer channel of the piston head, and the central hole is sealed by the sealing ring on the outer diameter of the sliding valve core. , the pressure in the rod cavity will continue to rise, thereby forming a pressure difference on both sides of the piston. When the pressure in the valve cavity is sufficient to overcome the compression spring, the sliding valve core will be pushed to move to the side of the isolation block, and finally the valve will open, making the center hole The flow path formed with the through hole is opened, and the pressure difference remains stable, so as to obtain the desired negative extension force for blocking the extension of the piston rod.

Description of drawings

Fig. 1 is the structural representation of the utility model.

In the figure: 1 is the cylinder, 2 is the piston rod, 3 is the isolation block, 4 is the sliding valve core, 5 is the cover, 6 is the through hole, 7 is the compression spring, 8 is the gasket ring groove, and 9 is the gasket Ring, 10 is a sealing ring, 11 is a through groove, 12 is a pressure balance hole, and 21 is a piston head.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Please refer to Fig. 1, the utility model provides a piston spring retarding mechanism, comprising: a cylinder 1 and a piston rod 2, one end of the piston rod 2 extends into the cylinder 1, and an isolation block 3 is also arranged in the cylinder 1, The end of one end of the piston rod 2 extending into the cylinder 1 is also fixed with a piston head 21, the outer edge of the piston head 21 matches the inner wall of the cylinder 1, the middle part of the piston head 21 is formed with a central hole, and the end of the piston rod 2 Align the center hole and fix a sliding spool 4 on the end surface. The end of the sliding spool 4 located on the side away from the piston rod 2 is formed into a cover 5 that fits with the end surface of the center hole. The piston head 21 faces the side of the piston rod 2. The cross-section of one side is trapezoidal, and a through hole 6 extending to the central hole is provided on the side wall of the trapezoidal side of the piston head 21, and a compression spring 7 is sleeved at the position where the sliding valve core 4 is located in the central hole. , A sealing ring 10 is also fixed on the inner wall of the central hole, and the sealing ring 10 is close to the outer wall of the sliding valve core 4 .

The cylinder 1 is injected with high-pressure nitrogen and oil, and the isolation block 3 separates the cylinder 1 into an oil cavity and an air cavity. One side is an air cavity.

A gasket ring groove 8 is also formed on the outer wall of the piston head 21 away from the piston rod 2 , and a gasket ring 9 is arranged in the gasket ring groove 8 .

A through groove 11 is also formed on the outer wall of the piston head 21 away from the piston rod 2 , and the through groove 11 communicates with the gasket ring groove 8 and the end surface of the piston head 21 away from the piston rod 2 .

A pressure balance hole 12 is formed on the end surface of the piston head 21 facing the piston rod 2 , and the pressure balance hole 12 extends into the gasket ring groove 8 .

The working principle is: the central hole of the piston head 21 forms a valve cavity, the end of the piston rod 2 is provided with a compression spring 7 and a sliding valve core 4, and a sealing ring 10 is provided on the outside of the sliding valve core 4, so that when the compression is performed, the oil passes through the piston head 21 The outer channel enters the rod cavity from the rodless cavity, and the central hole is sealed by the sealing ring 10 on the outer diameter of the sliding valve core 4. When stretching, because the internal and external channels of the piston head 21 are sealed, the rod cavity The internal pressure will continue to rise, thereby forming a pressure difference on both sides of the piston. When the pressure in the valve cavity is sufficient to overcome the compression spring 7, the sliding valve core 4 will be pushed to move to the side of the isolation block 3, and finally the valve will open, so that the center hole and the through passage The flow channel formed by the hole 6 is opened, and the pressure difference remains stable, thereby obtaining the desired negative extension force for retarding the extension of the piston rod 2 .

In the description of the present utility model, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "one side", " The orientation or positional relationship indicated by "top", "inner", "front", "central", "both ends" etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description , rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the utility model.

In this utility model, unless otherwise clearly specified and limited, terms such as "installation", "setting", "connection", "fixation" and "rotation" should be understood in a broad sense, for example, it may be a fixed connection, It can also be detachable connection, or integrated; it can be mechanical connection or electrical connection; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components or the interaction of two components Unless otherwise clearly defined, those skilled in the art can understand the specific meanings of the above terms in the present utility model according to specific situations.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes and modifications can be made to these embodiments without departing from the principle and spirit of the present invention , replacements and modifications, the scope of the present utility model is defined by the appended claims and their equivalents.

Claims (5)

1. A piston spring blocking mechanism, comprising: a cylinder and a piston rod, one end of the piston rod stretches into the cylinder, and a spacer is also arranged in the cylinder, it is characterized in that: the piston rod extends The end of one end of the cylinder is also fixed with a piston head, the outer edge of the piston head matches the inner wall of the cylinder, the middle part of the piston head is formed with a center hole, and the end of the piston rod is aligned with the center hole And a sliding valve core is also fixed on the end surface, and the end of the sliding valve core located away from the piston rod is formed into a cover that matches the end face of the central hole, and the cross section of the side of the piston head facing the piston rod is Trapezoidal, the side wall of the trapezoidal side of the piston head is also provided with a through hole extending to the central hole, the sliding valve core is also sleeved with a compression spring at the position in the central hole, and the inner side of the central hole A sealing ring is also fixed on the wall, and the sealing ring is close to the outer wall of the sliding valve core. 2. A piston spring retarding mechanism according to claim 1, characterized in that: the cylinder is injected with high-pressure nitrogen and oil, the isolation block separates the cylinder into an oil chamber and an air chamber, and the cylinder is divided into an oil chamber and an air chamber. The side of the isolation block close to the piston rod is an oil cavity, and the side of the isolation block away from the piston rod is an air cavity. 3. A piston spring retarding mechanism according to claim 2, characterized in that: the outer wall of the side of the piston head away from the piston rod is also formed with a gasket ring groove, and inside the gasket ring groove A gasket ring is provided. 4. A piston spring retarding mechanism according to claim 3, characterized in that: a through groove is formed on the outer wall of the piston head away from the piston rod, and the through groove communicates with the gasket ring The groove and the end face of the piston head away from the side of the piston rod. 5. A piston spring retarding mechanism according to claim 4, characterized in that: a pressure balance hole is formed on the end surface of the piston head facing the piston rod, and the pressure balance hole extends to the gasket ring in the slot.