KR20180047957A - Thin cylinder with load possible of dense forest preventing - Google Patents

Abstract

A thin cylinder enabling slip prevention of an operation rod of the present invention comprises: a cylinder main body including a first flow path which has an operating rod inserted into a front side of the cylinder main body such that the operating rod is movable forward and backward, and which has a first hydraulic pressure flown into a rear side thereof to move the operating rod forward, and including a second flow path into which a second hydraulic pressure is flown to move the operating rod backward; a first check valve which is installed in the first flow path; a second check valve which is installed in the second flow path; and a valve control unit including an initial operating unit which opens the first check valve to move the operating rod forward by the first hydraulic pressure, a position sensor which is operated only in a state that the first check valve is opened to sense the movement of the operating rod, and a slip preventing operation unit which closes the first check valve when the position sensor senses that the operating rod is moved as much as a preset forward movement distance, thereby blocking a backward movement due to slip of the operating rod.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a thin cylinder,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic cylinder including an operating rod which is inserted into a cylinder body so as to be capable of reciprocating by hydraulic pressure.

Generally, in a mold for injection molding, a slide core is used in combination for molding a product. The slide core is usually used in connection with a rod of a cylinder.

When the raw material is supplied at a high pressure to mold the product in the mold, the supply pressure of the raw material is transmitted to the slide core, and the rod of the cylinder is operated to perform the operation on the external force acting portion.

However, such injection molding dies are complicated in construction and have a large size of the mold, which causes difficulty in processing and assembling each part, resulting in lowering of productivity and cost increase.

In addition, when the operation is not smooth, a part line is formed in the molded product, which causes a problem of deterioration of the product quality.

In order to solve this problem, Korean Patent Laid-Open Publication No. 2006-0133856 discloses an internal combustion engine having a cylinder in which an operating rod moves up and down by hydraulic pressure; An identification window enclosing the operation rod and having a predetermined portion formed of a transparent material; A coupling fixed to the outer circumferential surface of the cylinder and engaged with the upper plate; And a cylinder core attached to a bottom surface of the operation rod to form an antenna hole in a mold operation through a top plate and a bottom plate.

However, in the prior art, when the working rod is higher in the force (Ex: 200 kg) that the working rod is pressed by the molded product than the pressing force (Ex: 100 kg) of the molded product by the hydraulic pressure, There is a problem that the hydraulic pressure supplied to the operation rod is backwardly flowed to the hydraulic valve and the hydraulic valve is broken or the molded product is damaged due to the pushing of the operation rod.

Further, since the prior art can prevent the jamming shape of the operation rod, the operation rod must operate both the pushing force of the molded product and the force exerted on the molded product by the operation log to operate the operation rod. There is a problem in that the process of calculating the force is complicated.

Korean Patent Publication No. 2006-0133856 (December 27, 2006)

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a method and an apparatus for manufacturing a molded product, in which, when a working rod is pressed against a molded product by hydraulic pressure, Provides a thin cylinder capable of preventing the working rod from being thrown out, which prevents the hydraulic pressure supplied from the hydraulic valve to the working rod from backflowing to the hydraulic valve when the hydraulic pressure is generated, damages the hydraulic valve, .

Further, another object of the present invention is to prevent the jamming shape of the operation rod, so that the operation rod only needs to calculate the pushing force of the molded product to operate the operation rod, so that the process of calculating the force for operating the operation rod is simplified And to provide a thin cylinder capable of preventing the working rod from being thrown out.

A thin cylinder capable of preventing the swinging of the operating rod according to the present invention is characterized in that the operating rod is forwardly and backwardly inserted so as to be forwardly and rearwardly displaced, a first flow passage for introducing a first hydraulic pressure for advancing the operating rod to the rear, A first check valve provided in the first flow path, a second check valve provided in the second flow path, and a second check valve provided in the first flow path, A position sensor that is operated only when the first check valve is opened to sense the movement of the operating rod, and a position sensor that detects the movement of the operating rod when the position sensor detects a predetermined forward distance , The first check valve is closed so that the backward movement due to the swinging motion of the operating rod is blocked, It characterized in that it comprises a fisherman.

The cylinder body may further include a support member which is provided in a communication path formed between the first flow path and the second flow path and supports the first plunger of the first check valve and the second plunger of the second check valve .

A hinge body hinged to the front of the cylinder body and having a sliding groove formed in the front and in the front and rear directions thereof and a hinge body slidably coupled to the sliding groove of the hinge body, And a rod holder including a shut-off body which is in close contact with an outer circumferential surface of the rod.

The rod holder may further include a contact body protruding from the support body toward the outer circumferential surface of the actuating rod and having a width wider toward the front and closely contacting the outer circumferential surface of the actuating rod.

The operation rod may include a rod groove formed on an outer circumferential surface of the rod body so as to receive the shut-off body, a load film covering the rod groove and hinged to the inside of the rod groove, And a rod spring formed between the rod groove and the rod film.

Accordingly, the thin cylinder capable of preventing the swinging of the operating rod according to the present invention causes the swing of the operating rod to occur when the operating rod is higher in force than the pushing force of the molded product by the hydraulic pressure, There is an advantage that the hydraulic pressure supplied to the operating rod from the hydraulic valve can be prevented from flowing back to the hydraulic valve and damaging the hydraulic valve or damaging the molded product due to the pushing of the operating rod.

Further, since the thin cylinder capable of preventing the operation rod according to the present invention can prevent the pushing shape of the operation rod, the operation rod only needs to calculate the pushing force of the molded product to operate the operation rod, There is an advantage that the process of calculating the force can be simplified.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing a thin cylinder capable of preventing the swinging of an operating rod according to Embodiment 1 of the present invention; Fig.
Fig. 2 is a schematic view showing the advancing state of the operating rod of the thin cylinder capable of preventing the swinging of the operating rod according to the first embodiment of the present invention; Fig.
Fig. 3 is a schematic view showing a state in which the operation rod according to the first embodiment of the present invention is prevented from retracting due to the swinging of the operating rod of the thin cylinder capable of preventing the swinging thereof.
4 is a schematic view showing the backward state of the operating rod of the thin cylinder capable of preventing the swinging of the operating rod according to the first embodiment of the present invention.
5 is a schematic view showing a thin cylinder capable of preventing the swinging of the operating rod according to the second embodiment of the present invention.
6 is an exploded perspective view showing a rod holder according to a second embodiment of the present invention.
7 is a perspective view showing the operating rod according to Embodiment 2 of the present invention.
8 is a schematic view showing a state in which the operation rod according to the second embodiment of the present invention is prevented from being retracted by the swinging of the operating rod of the thin cylinder capable of preventing the swinging thereof.

Hereinafter, the technical idea of the present invention will be described more specifically with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the technical concept of the present invention, are incorporated in and constitute a part of the specification, and are not intended to limit the scope of the present invention.

≪ Example 1 >

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing a thin cylinder capable of preventing the operation rod according to the first embodiment of the present invention from being thrown. FIG.

1, a thin cylinder 1000 capable of preventing the operation rod according to the first embodiment of the present invention includes a cylinder body 100, a first check valve 310, a second check valve 320, , And a valve control unit (not shown).

The cylinder body 100 is a basic body of the present invention, and is formed in a cylindrical structure having an open front, and the operation rod 200 is inserted forward and backward.

The cylinder body 100 is provided with a first oil passage 110 through which the first oil pressure can be introduced to the rear of the operation rod 200 in order to advance the operation rod 200, And a second flow path 120 is formed at a lower portion thereof to allow the second hydraulic pressure to flow in front of the operation rod 200 to move the operation rod 200 backward.

The first check valve 310 is installed in the first flow path 110 to regulate the flow of the first hydraulic pressure flowing into the first flow path 110,

The second check valve 320 is installed in the second flow path 120 and regulates the flow of the second hydraulic pressure flowing into the second flow path 120.

The valve control unit is a control unit such as a microcomputer, and includes a first operation unit for opening the first check valve 310 to advance the operation rod 200 by the first hydraulic pressure, A position sensor for detecting the backward movement of the operating rod 200 by being operated only when the first check valve 310 is opened and a position sensor for detecting the backward movement of the operating rod 200, The first check valve 310 is closed to prevent the backward movement of the operation rod 200 due to the swing of the operation rod 200 from being blocked.

Hereinafter, a process of preventing backward movement of the actuating rod 200 of the thin cylinder 1000 capable of preventing the operation rod according to the first embodiment of the present invention will be described.

Fig. 2 is a schematic view showing the advancing state of the operating rod of the thin cylinder capable of preventing the swing of the operating rod according to the first embodiment of the present invention. Fig. 3 is a cross- Fig. 4 is a schematic view showing a backward state of an operating rod of a thin cylinder capable of preventing the operation rod according to the first embodiment of the present invention from being pushed forward. Fig.

As shown in FIG. 2, the first check valve 310 is opened and the first oil pressure flows into the first oil passage 110, so that the operation rod 200 is advanced to push the molded product.

As shown in FIG. 3, when the working rod 200 pushes the molded product, the working rod 200 is more likely to be pressed by the molded product than the pressing force of the molded product by the hydraulic pressure However, when the present invention detects that the position sensor is shifted by a predetermined distance forward of the operation rod 200, the anti-skid operation unit may detect that the position sensor is operated The first check valve 310 is closed and the backward movement of the operation rod 200 due to the swing of the operation rod 200 is blocked.

4, after the operation rod 200 is pushed out of the molded product, the second check valve 320 is opened to allow the second hydraulic pressure to flow into the second flow path 120, So that the operating rod 200 is retracted and returned to its original position.

Accordingly, the thin cylinder 1000 capable of preventing the operation rod according to the first embodiment of the present invention is capable of preventing the operation rod 200 from being pressed against the molded product by the hydraulic force, The hydraulic pressure supplied to the operation rod 200 from the hydraulic valve back to the hydraulic valve may be broken and the hydraulic valve may be damaged or the working rod 200 may be jammed, There is an advantage that it can be prevented from being broken.

In addition, since the thin cylinder 1000 capable of preventing the swinging of the operating rod according to the first embodiment of the present invention can prevent the pushing shape of the operating rod 200, the operating rod 200 calculates only the pushing force of the molded product There is an advantage that the operation of calculating the force for operating the operation rod 200 can be simplified since the operation rod 200 is operated.

Referring again to FIG. 1, the first check valve 310 includes a first plunger 311, a first spring 312, a first valve body 313, a first valve seal 314, And an adjusting screw 315.

The first plunger 311 is installed on the first flow path 110 and the first spring 312 is installed on the upper side of the first plunger 311 to elastically apply the first plunger 311 And the first valve body 313 is installed on the upper side of the first plunger 311 and is screwed on the upper portion of the cylinder body 100 to wind the first spring 312, 1 valve seal 314 is provided between the first valve body 313 and the first flow path 110 and the first adjustment screw 315 is coupled to the upper end of the first valve body 313, The first spring 312 can adjust the pressing force of the first plunger 311 by the rotation of the first valve body 313.

The second check valve 320 includes a second plunger 321, a second spring 322, a second valve body 323, a second valve seal 324, and a second adjusting screw 325 can do.

The second plunger 321 is installed on the second flow path 120 and the second spring 322 is installed on the lower side of the second plunger 321 to move the second plunger 321 The second valve body 323 is installed on the lower side of the second plunger 321 and is screwed to the lower portion of the cylinder body 100 to wind the second spring 322, The second valve seal 324 is installed between the second valve body 323 and the second flow path 120 and the second adjustment screw 325 is coupled to the lower end of the second valve body 323, And the second spring 322 can adjust the force pressing the second plunger 321 by the rotation of the second valve body 323.

The cylinder body 100 is installed in a communication path 130 formed between the first flow path 110 and the second flow path 120 and is connected to the first plunger 311 of the first check valve 310 The support member 140 may include a support member 140 for supporting the second plunger 321 of the second check valve 320. The support member 140 may include the first plunger 311 and the second plunger 321, It is possible to prevent the first plunger 311 and the second plunger 321 from being moved to a different position from the position where the first flow path 110 and the second flow path 120 are closed respectively .

≪ Example 2 >

FIG. 5 is a schematic view showing a thin cylinder capable of preventing the operation rod according to the second embodiment of the present invention from being slid; and FIG. 6 is an exploded perspective view showing the rod holder according to the second embodiment of the present invention.

As shown in FIG. 5, the thin cylinder 1000 capable of preventing the swinging of the actuating rod according to the second embodiment of the present invention is configured such that the backward movement due to the swinging of the actuating rod 200 is more easily blocked, 400).

6, the rod holder 400 includes a hinge body 410 hinged to the front of the cylinder body 100 through a bearing 440 and having a sliding groove 411 formed at a front side thereof in a vertical direction, And a blocking rail 421 slidably coupled to the sliding groove 411 of the hinge body 410 so that the back of the operating rod 200 is blocked by the swing of the operating rod 200. [ And a cut-off body 420 which is in close contact with the outer circumferential surface.

5, the rod holder 400 is in contact with the outer circumferential surface of the actuating rod 200 when the actuating rod 200 advances, So that the backward movement of the vehicle can be blocked as much as possible.

7 is a perspective view showing the operation rod 200 according to the second embodiment of the present invention.

6 to 7, the rod holder 400 is attached to the outer circumferential surface of the operation rod 200 or is caught by a rod step 201 formed on the outer circumferential surface of the rod holder 400, And is extended from the support body toward the outer circumferential surface of the actuating rod 200 so as to block the backward movement. The width of the protrusion is increased toward the front, and the outer circumferential surface of the actuating rod 200 or the rod- And may further include a body 430.

8 is a schematic view showing a state in which the operation rod is prevented from being retracted by the swinging of the operation rod of the thin cylinder 1000 capable of preventing the operation rod according to the second embodiment of the present invention.

5 and 8, the operation rod 200 includes a rod groove 210 formed on an outer circumferential surface thereof to receive the shut-off body 420, A load membrane 220 hinged to the inside of the rod groove 210 and movable only within the rod groove 210 and a rod spring 230 formed between the rod groove 210 and the rod membrane 220 ). ≪ / RTI >

At this time, the actuation rod 200 is inserted into the rod groove 210 while opening the rod 220 in a state where the rod body 400 is in the advanced state, The backward movement of the operation rod 200 can be blocked and the shutoff body 420 of the rod holder 400 is slid in the vertical direction when the operation rod 200 is retracted again, 210).

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

1000: Thin cylinder capable of preventing the swinging of the operating rod according to the present invention
100: cylinder body
110: First Euro
120: the second euro
130:
140: support member
200: working load
201:
210: Load home
220: rod membrane
230: Load spring
310: first check valve
311: first plunger
312: first spring
313: first valve body
314: first valve seal
315: first adjusting screw
320: second check valve
321: second plunger
322: second spring
323: second valve body
324: Second valve seal
325: Second adjusting screw
400: rod holder
410: Hinge body
411: Sliding groove
420: Cutoff body
421: Blocking rail
430: tight body
440: Bearings

Claims (5)

And a second oil passage for introducing a first oil pressure to the first oil pressure inlet for forwarding the operation rod and a second oil passage for introducing the second oil pressure for moving the operation rod backward, main body;
A first check valve installed in the first flow path;
A second check valve installed in the second flow path; And
A first check valve for opening the first check valve to allow the operating rod to advance by a first hydraulic pressure; a position sensor operative only when the first check valve is open to sense movement of the operating rod; And an anti-skid operation part that closes the first check valve when the sensor senses the movement of the operation rod by a predetermined distance, and prevents the backward movement due to the swing of the operation rod from being blocked To prevent the working rod from being thrown.
The cylinder head according to claim 1, wherein the cylinder body
Further comprising a support member installed in a communication path formed between the first flow path and the second flow path and supporting a first plunger of the first check valve and a second plunger of the second check valve, Thin cylinder with anti-skid.
The method according to claim 1,
A hinge body hinged to the front of the cylinder body and having a sliding groove formed in a vertical direction forward; and a hinge body slidably coupled to the sliding groove of the hinge body, And a rod holder including a shut-off body which is in close contact with an outer circumferential surface of the rod.
4. The apparatus of claim 3, wherein the rod holder
Further comprising a contact body protruding from the support body toward an outer circumferential surface of the actuating rod, the contact body being formed to be wider toward the front and being able to be brought into close contact with the outer circumferential surface of the actuating rod. cylinder.
4. The apparatus of claim 3, wherein the actuation rod
A load film formed on the outer circumferential surface so that the cut-off body can be received; a rod film covering the rod groove and hinged to the inside of the rod groove and movable only within the rod groove; And a load spring formed between the piston and the cylinder block.

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