KR101866936B1

KR101866936B1 - Hydraulic cylinder

Info

Publication number: KR101866936B1
Application number: KR1020160013236A
Authority: KR
Inventors: 한연수
Original assignee: 한연수
Priority date: 2016-02-03
Filing date: 2016-02-03
Publication date: 2018-06-12
Also published as: KR20170092207A

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic cylinder having a locking function in which a rod rod is fixed regardless of a hydraulic pressure in a state in which a rod rod is lowered and more particularly to a hydraulic cylinder in which a bushing and a fastener for a locking function are moved And to a hydraulic cylinder whose durability is ensured.
According to the present invention, a first hollow and a second hollow having an inner diameter larger than that of the first hollow are formed so as to communicate with each other with the first inclined surface therebetween, and the upward fluid inlet and the downward fluid inlet / A cylinder having a fluid inlet and an outlet respectively; A rod inserted into the cylinder at a predetermined depth so as to be able to ascend and descend and having an outer diameter enlarged piece and a restraint piece protruding from the outer surface of the middle portion and the lower end portion respectively having an outer diameter corresponding to the first hollow; And a guide member provided between the outer diameter enlarging piece and the restraining member for lifting and lowering the rod by elevating and lowering by the pressure of the fluid flowing in and out from the ascending fluid inlet and outlet and the lower fluid inlet and outlet, A bushing having a small diameter portion which is a second tilted surface whose outer surface forms an end surface; And a third inclined surface corresponding to the first inclined surface is formed on the outer circumferential surface and a fourth inclined surface having a curved surface corresponding to the second inclined surface is formed on the inner circumferential surface, When the bushing is lifted, the fourth inclined surface rises while coming into surface contact with the second inclined surface, and when the bushing descends, the inner circumferential surface of the bushing descends to the outer peripheral surface of the small diameter portion And a rod fixing means for fixing the lowering state of the rod irrespective of the fluid which is moved downward to come in and out of the rising fluid inlet and outlet.

Description

Hydraulic cylinder

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic cylinder having a locking function in which a rod rod is fixed regardless of a hydraulic pressure in a state in which a rod rod is lowered and more particularly to a hydraulic cylinder in which a bushing and a fastener for a locking function are moved And to a hydraulic cylinder whose durability is ensured.

Generally, a hydraulic cylinder is a device that exerts a mechanical force by reciprocating linear motion of a rod rod (including a piston or a plunger) by the pressure of a fluid flowing into or out of the cylinder body, and has various shapes and structures. It is used for various purposes.

Among these hydraulic cylinders, the hydraulic cylinder, which has been patented and registered by the present applicant, has a hydraulic pressure applied to the rod rod 20 in a state in which the rod rod 20 is lowered (returned to the cylinder body) The rod rod 20 is fixed as it is in the lowered state.

That is, even if the fluid pushing the rod rod 20 downward due to the action of the bushing 50 and the fixture 40 installed in the cylinder body 10 is discharged to the outside and the hydraulic pressure is released, Is not moved up or fixed but fixed.

On the other hand, in the hydraulic cylinder, each inclined surface in which the bushing 50 and the fixture 40 are in contact with each other is constituted by convex surfaces having different radii.

Therefore, when the fluid is introduced and discharged to raise or lower the rod rod 20, the bushing 50 and the inclined surfaces of the fixture 40 are in contact with each other by point or line contact, There is a problem that partial breakage or abrasion occurs.

Korean Registered Patent Publication No. 10-1374859, April 10, 2014.

It is an object of the present invention to provide a hydraulic cylinder in which operation and durability are ensured as the bushing and the fixture for locking function move up and down in mutual contact with each other.

The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood from the following description.

In order to accomplish the above object, a hydraulic cylinder according to the present invention comprises a first hollow and a second hollow having an inner diameter larger than that of the first hollow, the upper hollow and the lower hollow being communicated with each other with a first inclined surface therebetween, A cylinder having a rising fluid inlet and a falling fluid inlet; A rod inserted into the cylinder at a predetermined depth so as to be able to ascend and descend and having an outer diameter enlarged piece and a restraint piece protruding from the outer surface of the middle portion and the lower end portion respectively having an outer diameter corresponding to the first hollow; And a guide member provided between the outer diameter enlarging member and the restraining member and lifting and raising the rod by the pressure of fluid flowing in and out from the rising fluid inlet and outlet and the lower fluid inlet and outlet and having a large diameter portion and an outer diameter smaller than the large diameter portion, A bushing having a small diameter portion which is a second tilted surface whose outer surface forms an end surface; And a third inclined surface corresponding to the first inclined surface is formed on the outer circumferential surface and a fourth inclined surface having a curved surface corresponding to the second inclined surface is formed on the inner circumferential surface, When the bushing is lifted, the fourth inclined surface rises while coming into surface contact with the second inclined surface, and when the bushing descends, the inner circumferential surface of the bushing descends to the outer peripheral surface of the small diameter portion And a rod fixing means for fixing the lowering state of the rod irrespective of the fluid which is lowered while being in contact with and flows into and out of the rising fluid inlet and outlet, A connecting hole which is inserted in the inside of the connecting pipe and fixed to the upper end of the rod, in which an insertion groove is formed in an upper end, and a through hole communicating with the insertion groove is formed horizontally on both upper ends; A mold pin inserted into the insertion groove at a predetermined depth and having a restricting groove formed at a lower end thereof; And a fixing pin which is horizontally movably provided on the through hole and is horizontally moved to the insertion groove side when the rod is lowered to be inserted into the constraining groove so as not to separate the mold pin, And a mold pin fixture detached from the mold pin and releasably releasable from the mold pin.

And an elastic member provided between the outer diameter enlarging piece and the bushing to elastically support the rod.

The outer circumferential surface of the small diameter portion forms an inclined surface inclined downward, and the inner circumferential surface of the rod fixture forms an inclined surface that is inclined upward so as to be in surface contact with the outer circumferential surface of the small diameter portion.

And a fluid path through which the fluid passes is formed between the outer diameter enlarging piece and the inner circumferential surface of the first hollow to allow the bushing to move up and down by the fluid when the fluid enters and leaves the rising fluid inlet and outlet.

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Wherein a guide groove having a length shorter than that of the guide groove and a stop groove having a longer length than the stopper are formed in the inner peripheral surface of the through hole, And the depth of insertion of the mold pin fixture into the restricting groove is limited.

And the upper end inner circumferential surface of the connecting pipe is composed of an inclined surface inclined upward.

And the inner circumferential surface of the mold pin fixture is formed of a curved surface having a larger radius than the outer circumferential surface of the lower end of the mold pin.

The present invention with the above-described configuration can be expected to have the following effects.

First, as the bushing for the locking function and the rod fastener come into mutual contact with each other and move up and down, the operation and durability of the hydraulic cylinder can be enhanced at the same time. In addition, the mold pin can be detachably fixed to the upper side of the hydraulic cylinder according to the locking function, so that the mold pin can be easily replaced while preventing the mold pin from flowing.

1 is a sectional view showing a conventional hydraulic cylinder;
2 is a sectional view showing a hydraulic cylinder of the present invention.
Fig. 3 is a cross-sectional view showing a state in which the rod is lifted in Fig. 2; Fig.
4 is a cross-sectional view of the cylinder of Fig. 2;
5 is a top view and cross-sectional view of the rod of FIG. 2;
Figure 6 is a top view and cross-sectional view of the bushing of Figure 2;
7 is a cross-sectional view and plan view of the rod fastener of FIG. 3;
8 is a cross-sectional view of the connection tube of Fig. 3;
Figure 9 is a top view and cross-sectional view of the connector of Figure 3;
10 is a cross-sectional view of the mold pin of FIG. 3;
11 is a plan view and a sectional view showing the mold pin fastener of Fig. 3;
12 is a cross-sectional view showing a coupling structure between the connection pin and the mold pin fixture of FIG. 3;

The present invention relates to a hydraulic cylinder having a locking function in which a rod rod is fixed regardless of a hydraulic pressure in a state in which a rod rod is lowered.

Particularly, the hydraulic cylinder according to the present invention is characterized in that the operation and durability are ensured as the bushing and the fixture for the locking function move up and down in mutual contact with each other.

This feature is achieved by a structure in which the mating surfaces of the bushing and the fixture are curved and are raised and lowered in mutual surface contact by corresponding surfaces that are curved when the bushing is lifted and lowered by the pressure of the fluid do.

Therefore, since the corresponding surfaces of the bushing and the fixing member are in surface contact with each other, smooth operation can be ensured and pressure can be dispersed to ensure durability.

Hereinafter, a hydraulic cylinder according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The hydraulic cylinder according to the preferred embodiment of the present invention may be configured to include the cylinder 100, the rod 200, the bushing 300, and the rod fixture 400 as shown in FIGS.

First, the cylinder 100 constitutes the body of the hydraulic cylinder.

4, the first hollow 110 and the second hollow 120 are formed on the upper side and the lower side of the cylinder 100, and the second hollow 120 is formed on the upper side of the first hollow 110 The first hollow 110 and the second hollow 120 are communicated with each other with the first inclined surface 130 interposed therebetween and the upward fluid inlet 140 and the upward fluid inlet / And a downward fluid inlet / outlet 150 are formed.

Next, the rod 200 is configured to move up and down within the cylinder 100 by the bushing 300 that ascends and descends according to the hydraulic pressure.

2 and 5, the rod 200 is inserted into the upper portion of the cylinder 100 so as to be vertically movable up and down, and has an outer diameter corresponding to the first hollow 110 on the outer surface of the middle portion and the lower end portion The outer diameter enlarging piece 210 and the restraining piece 220 are protruded.

That is, the rod 200 moves up and down along the inside of the cylinder 100 in a state where the rod 200 is not separated into the upper portion of the cylinder 100 by the outer diameter enlarging piece 210. A fluid stop groove (230) is formed on the outer peripheral surface of the lower side of the rod (200).

Next, the bushing 300 is configured to move up and down by the pressure of the fluid flowing into and out of the cylinder 100 so that the rod 200 can be moved up and down along the inside of the cylinder 100.

2 and 6, the bushing 300 is formed at a lower portion of the large diameter portion 310 and a large diameter portion 310 having an outer diameter corresponding to the first hollow 110 of the cylinder 100 Diameter portion 320 having a smaller outer diameter than the large diameter portion 310 and the through hole 330 penetrates the upper and lower portions of the outer diameter enlarging piece 210 and the restraint piece 220 As shown in FIG.

The bushing 300 has a fluid action groove 311 formed therein so as to uniformly apply the fluid pressure uniformly to the upper surface of the bushing 300. The lower end surface of the small diameter portion 320 is formed into a curved second inclined surface 321 .

That is, when the fluid flows into the rising fluid inlet / outlet 140, the bushing 300 pushes the outer diameter enlarging piece 210 upward by raising the pressure due to the pressure, raises the rod 200 and causes the fluid to flow into the falling fluid inlet / The rod 200 is lowered by pushing the outer diameter enlarging piece 210 downward while being lowered by the pressure.

However, in order for the bushing 300 to be lifted and lowered by the fluid pressure, the fluid below the outer diameter enlarging piece 210 is inserted between the outer circumferential surface of the outer diameter enlarging piece 210 and the inner circumferential surface of the cylinder 100, Diameter side of the outer diameter enlarging piece 210 is moved to the upper side of the outer diameter enlarging piece 210 or the fluid moving path 160 for moving the fluid above the outer diameter increasing piece 210 to the lower side of the outer diameter increasing piece 210 is secured, (211).

Next, the rod fixture 400 is configured to fix the rod 200 which ascends and descends along the inside of the cylinder 100 by the bushing 300.

That is, the rod fixture 400 maintains the rod 200 in a lowered state even if the pressure of the fluid that has lowered the bushing 300 is released while the rod 200 is lowered, Do not do it.

As shown in FIGS. 2 and 7, the rod fixture 400 is provided with a plurality of gaps between the bushing 300 and the restraint piece 220, and the upper outer surface of the rod fixture 400 corresponds to the first inclined surface 130 And a fourth inclined surface 420 whose upper inner surface is curved so as to correspond to the second inclined surface 321.

2, when the bushing 300 is lifted up, the rod fixing member 400 is moved in the direction of the second (110) and second (120) The inner circumferential surface 430 of the bushing 300 is brought into contact with the outer circumferential surface 322 of the small diameter portion 320 when the bushing 300 is lowered as shown in FIG. So that the lowered state of the rod 200 is fixed regardless of the fluid flowing in and out of the rising fluid inlet / outlet 140.

2, when the rod 200 is lowered, the rod 200 flows due to the action of the bushing 300 and the rod fixture 400 when the fluid does not flow through the riser fluid inlet / outlet 140 The locking function is fixed.

2 and 3, the hydraulic cylinder according to the preferred embodiment of the present invention includes an elastic member 500 installed between the outer diameter enlarging member 210 and the bushing 300 to elastically support the rod 200, As shown in FIG.

The outer circumferential surface 322 of the small diameter portion 320 of the bushing 300 is inclined downward and the inner circumferential surface 430 of the rod fixture 400 is upwardly brought into surface contact with the outer circumferential surface 322 of the small diameter portion 320 And may be composed of inclined slopes.

That is, when the bushing 300 and the rod fixture 400 move up and down, the outer circumferential surface 322 of the small diameter portion 320 of the bushing 300 and the rod fixture 400 The inner circumferential surface 430 is prevented from being abraded or damaged.

2 and 3, the hydraulic cylinder according to the preferred embodiment of the present invention includes a connecting pipe 600, a connecting hole 700, a metal mold 800, And may further include a pin 800 and a mold pin fixture 900.

The connecting pipe 600 is coupled to the upper end of the cylinder 100 and has an insertion space 610 formed at an upper portion thereof and a lower portion at the lower end thereof as shown in FIG. .

As shown in FIG. 9, the connector 700 is inserted into the connection pipe 600 and fixed to the upper end of the rod 200. The connector 700 has an insertion groove 720 formed at an upper end thereof, And a through hole 730 communicating with the through hole 720 is formed horizontally.

The mold pin 800 is inserted into the insertion groove 720 of the connector 700 at a predetermined depth and has an insertion portion corresponding to the insertion groove 720 at the lower end as shown in FIG. (810).

12, the mold pin fixing tool 900 is horizontally movably installed in the through hole 730 of the connector 700 so as to fix the mold pin 800 so as not to be detached from the connector 700 to be.

2, when the rod 800 is lowered, the mold pin fixing hole 900 is inserted into the restricting groove 810 of the mold pin 800 while horizontally moving toward the insertion groove 720 side of the connector 700 The mold pin 800 is not separated and is moved away from the restricting groove 810 of the mold pin 800 while horizontally moving to the opposite side of the insertion groove 720 of the connector 700 when the rod 800 rises as shown in FIG. So that the mold pin 800 is detachable.

For this purpose, a guide pin 910 and a detent jaw 920 are formed in order along the moving direction of the pin fixing member 900 to be inserted into the fixing groove 810 as shown in FIG. 11, It is preferable that a guide groove 740 having a shorter length than the guide groove 910 and a detent groove 750 having a length longer than the detent jaw 920 are formed along the inner circumferential surface of the through hole 730.

The mold pin fixture 900 can be horizontally moved toward the restricting groove 810 by a stroke corresponding to the difference in length between the detent jaw 920 and the detent groove 750, .

8, when the rod 200 ascends, the upper end inner circumferential surface 620 of the connection pipe 600 is moved upwards by a predetermined distance to the opposite side of the restricting groove 810 It is preferable that it is composed of an inclined sloping surface.

The inner circumferential surface 930 of the mold pin fixture 900 is preferably formed of a curved surface having a larger radius than the lower outer circumferential surface of the mold pin 800 so that the mold pin 800 can be smoothly separated when the rod 200 rises Do.

The above-described embodiments are merely illustrative, and various modifications may be made by those skilled in the art without departing from the scope of the present invention.

Therefore, the true technical protection scope of the present invention should include not only the above embodiments but also various other modified embodiments according to the technical idea of the invention described in the following claims.

100: Cylinder
110: 1st hollow
120: Second hollow
130: first inclined surface
140: rising fluid inlet
150: descending fluid outlet
160: Fluid moving path
200: Load
210: enlarged outer diameter
211:
220:
230: Fluid stop groove
300: Bushing
310:
311: Fluid action groove
320: Small neck
321: second inclined surface
322:
400: rod clamp
410: third slope
420: fourth inclined surface
430: inner peripheral surface
500: elastic member
600: connecting pipe
610: Insertion space
620:
700: connector
710: fastening groove
720: insertion groove
730: Through hole
740: guide projection
750: Stopping groove
800: mold pin
810:
900: Mold pin fixture
910: Guide groove
920: stop chin

Claims

A first hollow and a second hollow having an inner diameter larger than that of the first hollow are formed so as to communicate with each other with the first inclined surface therebetween in the upper and lower sides and a rising fluid inlet port and a falling fluid inlet port cylinder;
A rod inserted into the cylinder at a predetermined depth so as to be able to ascend and descend and having an outer diameter enlarged piece and a restraint piece protruding from the outer surface of the middle portion and the lower end portion respectively having an outer diameter corresponding to the first hollow;
And a guide member provided between the outer diameter enlarging piece and the restraining member for lifting and lowering the rod by elevating and lowering by the pressure of the fluid flowing in and out from the ascending fluid inlet and outlet and the lower fluid inlet and outlet, A bushing having a small diameter portion which is a second tilted surface whose outer surface forms an end surface; And
A third inclined surface corresponding to the first inclined surface is formed on the outer circumferential surface, and a fourth inclined surface formed on the inner circumferential surface corresponding to the second inclined surface to form a curved surface is formed between the outer diameter enlarged piece and the restraining piece When the bushing rises, the fourth inclined surface rises while coming into surface contact with the second inclined surface. When the bushing descends, the inner peripheral surface of the bushing is brought into contact with the outer peripheral surface of the small- And a rod fixing means for fixing the lowering state of the rod irrespective of the fluid flowing in and out from the rising fluid entrance,
A connection pipe provided at an upper end of the cylinder;
A connecting hole which is inserted in the inside of the connecting pipe and fixed to the upper end of the rod, in which an insertion groove is formed in an upper end, and a through hole communicating with the insertion groove is formed horizontally on both upper ends;
A mold pin inserted into the insertion groove at a predetermined depth and having a restricting groove formed at a lower end thereof; And
The rod is horizontally movably provided on the through hole, and is horizontally moved to the insertion groove side when the rod is lowered. The rod is inserted into the restricting groove to restrain the mold pin from being separated. When the rod is lifted, And a mold pin fixture detachably detachably releasing the mold pin.

The method according to claim 1,
And an elastic member provided between the outer diameter enlarging piece and the bushing to elastically support the rod.

The method according to claim 1,
The outer circumferential surface of the small-diameter portion forming an inclined surface inclined downward,
Wherein the inner circumferential surface of the rod fixing member is inclined upwardly inclined so as to be in surface contact with the outer circumferential surface of the small diameter portion.

The method according to claim 1,
And a fluid path through which the fluid can pass is formed between the outer diameter enlarging piece and the inner circumferential surface of the first hollow so that the bushing can be lifted and lowered by the fluid when the fluid flows into and out of the rising fluid outlet and the falling fluid outlet. .

delete

The method according to claim 1,
Wherein the mold pin fixing hole is formed with a guide groove and a stopping jaw in order along the moving direction inserted into the constraining groove,
The connecting hole is formed with a guide groove having a length shorter than that of the guide groove and a stop groove having a length longer than the stopper along the inner circumferential surface of the through hole,
Wherein a depth of the metal pin fixing member inserted into the restricting groove is limited.

The method according to claim 1,
And the upper end inner circumferential surface of the connecting pipe is composed of an inclined surface inclined upward.

The method according to claim 1,
Wherein the inner circumferential surface of the mold pin fixture is formed of a curved surface having a larger radius than the lower outer circumferential surface of the mold pin.