KR20220153317A - Screw fluid cylinder - Google Patents

Abstract

The present disclosure relates to a screw fluid cylinder capable of moving a piston rod forward while rotating the piton rod in one direction along a supply direction of fluids by forward and backward ports and moving the piston rod while moving the piston rod backward while rotating the piston rod in an opposite direction, thereby performing the linear reciprocation and bidirectional rotation of the piston rod at the same time. The present disclosure includes: a cylinder body; a rear cover coupled to the rear end of the cylinder body; a screw shaft fixedly coupled and fixed to the rear cover and extended into the cylinder body; a rotation movement block coupled to the screw shaft to be able to move forward or backward while rotating at the same time; a piston rod having a rear end coupled and fixed to the rotation movement block to move forward or backward while rotating at the same time integrally with the rotation movement block; and a front cover coupled to the front end of the cylinder body and coupled to the piston rod to be able to move forward or backward while rotating at the same time.

Description

Screw fluid cylinder {SCREW FLUID CYLINDER}

The disclosed content relates to a screw fluid cylinder in which a piston rod moves forward while rotating in one direction according to the supply direction of fluid and moves backward while rotating in the opposite direction.

Unless otherwise indicated herein, material described in this section is not prior art to the claims in this application, and inclusion in this section is not an admission that it is prior art.

In general, a fluid cylinder refers to a mechanical device that converts the energy of a fluid such as compressed air into mechanical energy. It has a structure that linearly reciprocates the piston rod.

Such a fluid cylinder is applied to various devices requiring linear reciprocating motion, such as, for example, a linear transfer mechanism, and is used for various purposes in various industrial fields.

As an example of such a fluid cylinder, Korean Patent Publication No. 10-2000-0026367 (published on May 15, 2000) discloses a cylinder body, a piston rod installed in the cylinder body to allow linear reciprocating motion, and installed on the piston rod. An air cylinder including a piston for reciprocating linear motion of the piston rod by air pressure is disclosed.

In addition, Republic of Korea Utility Model Registration No. 20-0231792 (published on July 19, 2001) describes a cylinder case in which an air port is installed, a piston installed inside the cylinder case, and one end connected to the piston so that the outside of the cylinder case A rod protruding and protruding, a rod cover covering the rod and also having an air port installed, a flange extending below the rod cover, a joint shaft formed through the flange, and a joint shaft installed at the other end of the rod An air cylinder comprising a double knuckle joint formed and a switch mounting rail installed over the rod cover and one outer surface of the cylinder case is disclosed.

Such a fluid cylinder is operated while the piston rod is linearly reciprocated according to the supply direction of a fluid such as compressed air, but does not involve rotational motion.

On the other hand, in Korean Utility Model Publication No. 20-1997-0027690 (published on July 24, 1997), a cylinder rod equipped with a position guide block is rotatably installed in a rotation space formed in a cylinder body, and power is provided to give rotation to the cylinder rod. A rotating cylinder including a plurality of ports for supplying is disclosed.

Such a rotary cylinder is only operated while the piston rod rotates according to the supply direction of a fluid such as compressed air, and does not involve linear reciprocating motion.

1. Korean Patent Publication No. 10-2000-0026367 (published on May 15, 2000) 2. Republic of Korea Utility Model Registration No. 20-0231792 (Announced on July 19, 2001) 3. Republic of Korea Utility Model Publication No. 20-1997-0027690 (published on July 24, 1997)

As the piston rod moves forward while rotating in one direction according to the supply direction of fluid by the forward and backward ports, and moves backward while rotating in the opposite direction, a screw fluid cylinder is provided so that the linear reciprocating motion and bidirectional rotational motion of the piston rod can be simultaneously performed. want to do

In addition, it is not limited to the technical problems as described above, and it is obvious that other technical problems may be derived from the following description.

Disclosed is a cylinder body, a rear cover coupled to the rear end of the cylinder body, a screw shaft fixedly coupled to the rear cover and extending into the cylinder body, and penetrating the screw shaft to be able to move forward or backward while rotating. A rotational movement block coupled to the rotational movement block, a piston rod whose rear end is fixedly coupled to the rotational movement block and which rotates integrally with the rotational movement block and moves forward or backward at the same time, and which is coupled to the front end of the cylinder body and the piston rod rotates And a screw fluid cylinder including a front cover coupled to be able to move forward and backward is presented as an embodiment.

According to a preferred feature of the disclosure, a reverse port through which fluid is introduced or discharged is formed on one side of the cylinder body, and a forward port through which fluid is introduced or discharged is formed on one side of the rear cover.

According to a preferred feature of the disclosure, the fluid is compressed air.

According to a preferred feature of the disclosure, a rear sealing plate integrally protrudes from the front side of the rear cover, and a front sealing plate through which the piston rod is rotatably coupled to move forward and backward is coupled to the rear side of the front cover.

According to a preferred feature of the disclosure, the piston rod is integrally formed with a piston part that is fixedly coupled to the rotational movement block and can move forward or backward while rotating in the cylinder body, and the piston part extends forward and extends forward. It includes a rod portion coupled to the cover so as to be able to rotate and move forward and backward, and a screw shaft groove into which the screw shaft can be inserted is recessed across the piston portion and the rod portion.

According to the screw fluid cylinder according to the disclosed embodiment, as the piston rod moves forward while rotating in one direction according to the supply direction of the fluid by the forward and backward ports, and moves backward while rotating in the opposite direction, the linear reciprocating motion of the piston rod and both directions It has the advantage of being able to be used as a complex actuation type actuator in which rotational motion is performed simultaneously.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a perspective view of a screw fluid cylinder according to an embodiment of the present disclosure;
2 is an exploded perspective view of a screw fluid cylinder according to an embodiment of the present disclosure;
3 is a cross-sectional view of a screw fluid cylinder according to one embodiment of the present disclosure.
4 is an operational diagram of a screw fluid cylinder according to an embodiment of the present disclosure;

Hereinafter, with reference to the accompanying drawings, look at the configuration and operational effects of the preferred embodiment. For reference, in the drawings below, each component is omitted or schematically illustrated for convenience and clarity, and the size of each component does not reflect the actual size. In addition, like reference numerals refer to like components throughout the specification, and reference numerals for like components in individual drawings will be omitted.

1 is a perspective view of a screw fluid cylinder according to an embodiment of the disclosed subject matter, FIG. 2 is an exploded perspective view of a screw fluid cylinder according to an embodiment of the disclosed subject matter, and FIG. 3 is a screw according to an embodiment of the disclosed subject matter. A cross-sectional view of the fluid cylinder.

As shown in FIGS. 1 to 3, the screw fluid cylinder according to an embodiment of the disclosed subject matter includes a cylinder body 10, a rear cover 20 coupled to the rear end of the cylinder body 10, and a rear cover ( 20) fixedly coupled to the screw shaft 30 extending into the cylinder body 10, a rotational movement block 40 coupled to the screw shaft 30 to be able to move forward or backward at the same time as it rotates, and a rotational movement block ( 40) is coupled to the front end of the piston rod 50, which is fixedly coupled to the rotation moving block 40 and moves forward or backward at the same time as it rotates integrally with the rotation moving block 40, and the piston rod 50 rotates and a front cover 60 that is coupled through and capable of moving forward and backward.

Here, the cylinder body 10 corresponds to the housing of the screw fluid cylinder according to the embodiment of the disclosure, and forms a space for rotation and forward and backward movement of the piston rod 50 to be described later.

The cylinder body 10 preferably has a rectangular parallelepiped shape, and a through hole having a circular cross section is formed along the longitudinal direction for rotation and forward and backward movement of the piston rod 50 .

In addition, on one side of the cylinder body 10, for example, a reverse port 11 is formed so that a fluid such as compressed air is introduced or discharged. The reverse port 11 allows fluid to flow into the cylinder body 10 so that the piston rod 50 moves backward while rotating, or allows fluid to flow forward while the piston rod 50 rotates in the opposite direction to the cylinder body ( 10) to be discharged. The reverse port 11 may be formed as a simple structure that extends vertically from the top to the bottom, and as shown in FIG. 3, it extends vertically from the top to the bottom, is bent at a right angle, extends horizontally, and then extends vertically again. It can also be formed in the form of a multi-stage bent passage.

The cylinder body 10 is preferably made of a metal material, but depending on the embodiment, it can also be made of various materials such as a synthetic resin material.

A rear cover 20 is coupled to the rear end of the cylinder body 10 described above. The rear cover 20 serves to close the rear end of the cylinder body 10 in a watertight manner, and is preferably fastened and fixed to the rear end of the cylinder body 10 by the first fastening bolt 21, but welded. , It can be coupled to the rear end of the cylinder body 10 by various methods such as screw coupling.

A shaft fixing groove 23 is formed at the center of the front surface of the rear cover 20 to which the rear end of the screw shaft 30 to be described later is fixedly coupled. In addition, a rear sealing plate 25 is integrally protruded from the front side of the rear cover 20 . The rear sealing plate 25 is inserted into the through hole of the cylinder body 10 in a watertight manner, and a packing ring is provided on the outer circumferential surface. At this time, it is preferable that the shaft fixing groove 23 is formed at the center of the rear sealing plate 25.

In addition, the rear cover 20 is formed with a forward port 27 through which a fluid such as compressed air is introduced or discharged. The forward port 27 allows fluid to flow into the cylinder body 10 so that the piston rod 50 moves forward while rotating, or allows fluid to flow backward while the piston rod 50 rotates in the opposite direction to the cylinder body ( 10) to be discharged.

As shown in FIG. 3, it can be formed in the form of an angle-type flow path extending downward from the top and then bending at a right angle and extending horizontally.

The screw shaft 30 is fixedly coupled to the shaft fixing groove 23 of the rear cover 20 described above and extends into the cylinder body 10. The screw shaft 30 is ultimately fixedly coupled to the rotational movement block 40 by inducing it to move forward or backward simultaneously with the rotation of the rotational movement block 40 to be described later according to the supply direction of the fluid to the cylinder body 10. It serves to allow the piston rod 50 to move forward or backward simultaneously with rotation.

The screw shaft 30 has a spiral groove formed along the outer circumferential surface, and a coupling end 31 fixedly coupled to the shaft fixing groove 23 of the rear cover 20 is formed at the rear.

The rotational movement block 40 is coupled to the aforementioned screw shaft 30 through. The rotational movement block 40 moves forward or backward simultaneously while rotating on the screw shaft 30 by the pressure applied to the piston portion 51 of the piston rod 50 according to the supply direction of the fluid to the cylinder body 10 In the center, a screw hole 41 screwed to the screw shaft 30 is formed through.

This rotational movement block 40 is fixedly coupled to the rear end of the piston rod 50 by a second fastening bolt 43. The piston rod 50 rotates integrally with the rotational movement block 40 according to the supply direction of the fluid to the cylinder body 10 and moves forward or backward at the same time and serves to provide a corresponding combined action force to the outside.

The piston rod 50 is fixedly coupled to the rotational movement block 40 and integrally formed with a piston part 51 capable of moving forward or backward while rotating within the cylinder body 10, and the piston part 51 moving forward. It extends and includes a rod part 53 that is rotatably and forwardly coupled to the front cover 60 to be described later.

A piston ring 51a is provided on the outer circumference of the piston unit 51, and a ball bearing capable of rotating and moving forward and backward may be additionally provided according to an embodiment. In addition, a screw shaft groove 55 into which the screw shaft 30 can be inserted is recessed across the piston part 51 and the rod part 53.

The front cover 60 is coupled to the front end of the cylinder body 10 described above. The front cover 60 serves to close the front end of the cylinder body 10 in a watertight manner, and is preferably fastened and fixed to the front end of the cylinder body 10 by the third fastening bolt 61, but welded. , It can be coupled to the front end of the cylinder body 10 by various methods such as screw coupling.

At the center of the front cover 60, a rod through-hole 63 is formed through which the piston rod 50 is coupled to be able to rotate and move forward and backward. In addition, a front sealing plate 65 is coupled to the rear side of the front cover 60 through which the piston rod 50 is rotatably and forwardly coupled. The front sealing plate 65 is inserted into the through hole of the cylinder body 10 in a watertight manner, and a packing ring is provided on the outer circumferential surface.

4 is an operational diagram of a screw fluid cylinder according to an embodiment of the present disclosure. Hereinafter, a combined operation of a screw fluid cylinder according to an embodiment of the disclosure will be described with reference to FIGS. 1 to 4:

For example, when a fluid such as compressed air is introduced into the cylinder body 10 through the forward port 27 of the rear cover 20, the pressure of the fluid is applied to the piston portion 51 of the piston rod 50 from the rear to the front. At this time, the rotational movement block 40 fixedly coupled to the piston rod 50 rotates in one direction on the screw shaft 30 and moves forward at the same time, so that the piston rod 50 also rotates along with the rotational movement block 40 It rotates in one direction and moves forward at the same time. At this time, the fluid filled in the front space of the piston part 51 is discharged through the reverse port 11.

In addition, for example, when a fluid such as compressed air flows into the cylinder body 10 through the reverse port 11 of the cylinder body 10, the pressure of the fluid in the piston portion 51 of the piston rod 50 is applied from the front. It is applied backward, and at this time, the rotational movement block 40 fixedly coupled to the piston rod 50 rotates in the opposite direction on the screw shaft 30 and moves backward at the same time, so that the piston rod 50 also rotates the movement block 40 It rotates in the opposite direction and reverses at the same time. At this time, the fluid filled in the rear space of the piston part 51 is discharged through the forward port 27.

Therefore, in the screw fluid cylinder according to one embodiment of the disclosure, the piston rod 50 rotates in one direction according to the supply direction of the fluid by the forward port 27 or the backward port 11 while moving forward or rotating in the opposite direction. As it has a backward movement structure, it can be used as a combined action type actuator in which linear reciprocating motion and bi-directional rotational motion of the piston rod 50 are simultaneously performed.

Although the preferred embodiments of the present invention have been described with reference to the accompanying drawings, the embodiments described in this specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention and represent all the technical ideas of the present invention. Since it is not, it should be understood that there may be various equivalents and modifications that can replace them at the time of this application. Therefore, the embodiments described above should be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the claims to be described later rather than the detailed description, and the meaning and scope of the claims and their All changes or modified forms derived from equivalent concepts should be construed as being included in the scope of the present invention.

10: cylinder body
11: reverse port
20: rear cover
21: first fastening bolt
23: shaft fixing groove
25: rear sealing plate
27: forward port
30: screw axis
31: coupling end
40: rotation movement block
41: screw ball
43: 2nd fastening bolt
50: piston rod
51: piston part
51a: piston ring
53: loading part
55: screw shaft groove
60: front cover
61: 3rd fastening bolt
63: rod through hole
65: front sealing plate

Claims (5)

cylinder body;
a rear cover coupled to the rear end of the cylinder body;
a screw shaft fixedly coupled to the rear cover and extending into the cylinder body;
a rotational movement block coupled to the screw shaft so as to move forward or backward simultaneously with rotation;
a piston rod having a rear end fixedly coupled to the rotational movement block and simultaneously moving forward or backward while rotating integrally with the rotational movement block; and
A screw fluid cylinder comprising a front cover coupled to the front end of the cylinder body and through-coupled to the piston rod so as to rotate and move forward and backward. The method of claim 1,
A screw fluid cylinder, characterized in that a reverse port through which fluid is introduced or discharged is formed on one side of the cylinder body, and a forward port through which fluid is introduced or discharged is formed on one side of the rear cover. The method of claim 2,
The screw fluid cylinder, characterized in that the fluid is compressed air. The method of claim 1,
A screw fluid cylinder, characterized in that a rear sealing plate is integrally protruded from the front side of the rear cover, and a front sealing plate through which the piston rod is rotatably and forwardly coupled is coupled to the rear side of the front cover. The method of claim 1,
The piston rod is integrally formed with a piston part that is fixedly coupled to the rotational movement block and can move forward or backward while rotating within the cylinder body, and is integrally formed with the piston part and extends forward and rotates and moves forward and backward on the front cover. A screw fluid cylinder comprising a rod portion coupled through, wherein a screw shaft groove into which the screw shaft can be inserted is recessed across the piston portion and the rod portion.

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