KR101637037B1 - Hydraulic cylinder - Google Patents

Abstract

A hydraulic cylinder according to an embodiment of the present invention includes a cylinder tube which is opened to both sides so as to have a housing space therein, a first plunger inserted into the accommodation space through one side tube of the cylinder tube, A second plunger inserted into the accommodation space through a side passage, a first impeller which is coupled to a front end of the first plunger in a direction of insertion of the first plunger by a predetermined distance, A connecting portion connecting the first plunger and the second plunger to each other in a receiving space of the cylinder tube, and a second connecting portion connecting the first plunger and the second plunger to each other to supply pressure to the working fluid filled in the receiving space of the cylinder tube And a pressure supply unit.

Description

Hydraulic Cylinder {HYDRAULIC CYLINDER}

The present invention relates to a hydraulic cylinder, and more particularly, it relates to a hydraulic cylinder capable of reducing a volume of a facility by removing a flow path through which hydraulic oil flows in and out of the cylinder and an external compression pump that applies pressure to the hydraulic oil, And more particularly to a hydraulic cylinder that operates in accordance with rotation.

BACKGROUND ART A conventional hydraulic cylinder includes a cylinder tube filled with working oil and a piston or plunger moving in the cylinder tube inside the cylinder tube, and includes a flow path through which hydraulic fluid flows and a compression pump.

Such a conventional hydraulic cylinder is a type in which hydraulic oil flows into the cylinder from the outside of the cylinder and pushes the piston. The hydraulic cylinder must include a flow path for introducing hydraulic oil and a compression pump to the outside of the cylinder tube for operation of the cylinder. However, as a result, the volume is inevitably increased, so that a larger space is required to move the small cylinder, which makes it difficult to install and use.

KR 10-2014-0033268 A

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to reduce the volume of equipment by removing a flow path through which hydraulic oil flows in and out of the cylinder and an external compression pump which applies pressure to the hydraulic oil, Which is driven by the rotation of the impeller.

In order to achieve the above object, a hydraulic cylinder according to an embodiment of the present invention includes a cylinder tube which is opened to both sides so as to have a housing space therein, and a cylinder tube which is inserted into the accommodation space through a one- A first plunger, a second plunger inserted into the accommodating space through another side passage of the cylinder tube, a first impeller coupled to a front end portion of the first plunger in a direction in which the first plunger is inserted with a predetermined distance, A second impeller coupled to the front end of the plunger in a direction of insertion of the plunger so as to be spaced apart from the front end by a predetermined distance, a connecting portion interconnecting the first plunger and the second plunger in the accommodating space of the cylinder tube, And a pressure supply unit for supplying pressure to the working oil filled in the space.

Preferably, the first plunger and the second plunger include a first motor and a second motor, respectively, and the first motor and the second motor rotate the first impeller and the second impeller, respectively, .

Further, it may further comprise an actuating part connected to at least one of the first plunger and the second plunger protruding from the cylinder tube.

Also, preferably, the operation unit rotates the first impeller through the first motor when an external discharge command of the second plunger is inputted, and when the external discharge command of the first plunger is input, And a controller for rotating the second impeller through the second impeller.

Preferably, when the first impeller rotates, the pressure applied to the front end of the first plunger is reduced to discharge the second plunger to the outside of the cylinder tube. When the second impeller rotates, The pressure applied to the front end of the plunger is reduced and the first plunger can be discharged to the outside of the cylinder tube.

Preferably, when the first plunger is discharged to the outside of the cylinder tube, the second plunger is inserted into the cylinder tube by the connecting portion, and the second plunger is discharged to the outside of the cylinder tube The first plunger is inserted into the cylinder tube by the connecting portion, so that the volume occupied by the first plunger and the second plunger in the internal space of the cylinder tube can be kept constant.

Also preferably, the pressure supply portion may be embedded in one region of the cylinder tube.

Also preferably, the cylinder tube is a cylindrical body, and the both-side cylinder may include an end cap.

Further, preferably, the hydraulic cylinder may further include a filtering net having a predetermined angle with respect to the through-hole direction of the internal space of the cylinder tube and coupled to the connecting portion.

The hydraulic cylinder according to the present invention as described above has the effect of reducing the volume of the equipment by removing the flow path through which the hydraulic oil flows in and out from the outside of the cylinder and the external compression pump which applies pressure to the hydraulic oil.

1 is a sectional view of a hydraulic cylinder according to an embodiment of the present invention.
2 is a view showing an operating part of a hydraulic cylinder according to an embodiment of the present invention.
3 is a cross-sectional view of a hydraulic cylinder in which a plunger moves to one side according to an embodiment of the present invention.
4 is an enlarged view of a part of a sectional view of a hydraulic cylinder according to an embodiment of the present invention.
5 is a view showing a hydraulic cylinder according to another embodiment of the present invention.

In order to fully understand the present invention, operational advantages of the present invention, and objects achieved by the practice of the present invention, reference should be made to the accompanying drawings and the accompanying drawings which illustrate preferred embodiments of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference symbols in the drawings denote like elements.

1 is a sectional view of a hydraulic cylinder according to an embodiment of the present invention.

1, a hydraulic cylinder 100 according to an embodiment of the present invention includes a cylinder tube 110, a first plunger 120, a second plunger 130, a connecting portion 140, an operating portion 150, And may further include a first impeller 121, a second impeller 131, and a pressure supply unit 112 according to an embodiment of the present invention.

The cylinder tube 110 may be formed to have both sides thereof so as to have a receiving space therein. As an example, the cylinder tube 110 may be in the form of a cylinder, and may be modified into various forms according to the embodiment. An end cap 113 is formed at both sides of the cylinder tube 110 so that the both ends of the cylinder tube 110 can be filled with the operating fluid 111. [ It is possible to prevent the hydraulic fluid 111 from flowing out.

The pressure supply unit 112 can supply pressure to the operating fluid 111 filled in the internal space of the cylinder tube 110. The pressure supply unit 112 may be embedded in one region of the cylinder tube 110, as shown in FIG. As an example, the pressure supply unit 112 may be a small-sized air cylinder including air compressed at a high pressure, and may transmit high pressure to the operating oil 111 filled in the internal space of the cylinder tube 110. The pressure supplied by the pressure supply unit 112 acts on the surfaces of the first plunger 120 and the second plunger 130 uniformly and the pressure of the first plunger 120 and the second plunger 130 is adjusted, (130). The operation principle will be described in detail with reference to FIG. 3 to FIG. 4, and a detailed description will be omitted.

The first plunger 120 can be inserted into the internal accommodation space through one side of the cylinder tube 110 and the second plunger 130 can be inserted into the internal space through the other side of the cylinder tube 110, And can be inserted into the accommodation space. The first plunger 120 and the second plunger 130 may be realized as a plunger that is a mechanical part whose cross section is uniform over the entire length used for compressing fluid or transmitting pressure.

The first impeller 121 may be coupled to the front end of the first plunger 120 in the direction of insertion of the cylinder tube 110 into the inner space of the cylinder tube 110 by a predetermined distance. For example, the first impeller 121 may be connected to the first motor 122 included in the first plunger 120 by a rotation shaft, and may rotate according to the operation of the first motor 122.

The second impeller 131 may be coupled to the front end of the second plunger 130 in a direction in which the second plunger 130 is inserted into the internal space of the cylinder tube 110, with a predetermined distance therebetween. For example, the second impeller 13 may be connected to the second motor 132 included in the second plunger 130 by a rotation shaft, and may rotate according to the operation of the second motor 132. The first impeller 121 and the second impeller 131 may be realized by an impeller which generates a flow motion to the fluid by rotation, such as a wing wheel of a centrifugal pump.

The connection portion 140 can interconnect the first plunger 120 and the second plunger 130 in the internal space of the cylinder tube 110. Accordingly, the first plunger 120 and the second plunger 130 are coupled to each other to perform the same motion in the cylinder tube 110.

The actuating part 150 may be connected to at least one of the first plunger 120 or the second plunger 130 protruded to the outside of the cylinder tube 110 through an electric wire or the like. The operation unit 150 will be described in detail with reference to FIG. 2, and a detailed description thereof will be omitted.

The specific operation of the hydraulic cylinder 100 according to the embodiment of the present invention shown in FIG. 1 will be described in detail with reference to FIGS. 2 to 5. FIG.

2 is a view showing an operating part of a hydraulic cylinder according to an embodiment of the present invention. 2, the operation unit 150 may include a control unit 151, an interface unit 152, and a power supply unit 153.

The control unit 151 may control the first plunger 120 and the second plunger 130 of the hydraulic cylinder 100 to perform the piston movement. That is, when the external discharge command of the second plunger 130 is input, the controller 151 rotates the first impeller 121 through the first motor 122, The second impeller 131 can be rotated through the second motor 132. The first plunger 120 and the second plunger 130 can perform the piston movement according to the rotation of the first impeller 121 and the second impeller 131. [ The external discharge command of the first plunger 120 and the second plunger 130 may be inputted directly from the user through the interface unit 152 or may be automatically inputted by a preset program according to the embodiment. The control unit 151 controls the operation unit 150 as a whole and may be implemented by a central processing unit (CPU) or an MPU.

The interface unit 152 can transmit the command signal input from the user to the control unit 151. [ For this, the interface unit 152 may be implemented by various input devices such as a keyboard, a mouse, and a touch screen.

The power supply unit 153 can supply power to the first motor 122 and the second motor 132 under the control of the control unit 151 and can supply power to the control unit 151 and the interface unit 152 Can be supplied.

3 is a cross-sectional view of a hydraulic cylinder in which a plunger moves to one side according to an embodiment of the present invention. The components of the hydraulic cylinder 100 shown in FIG. 3 have been described above with reference to FIG. 1, and a detailed description thereof will be omitted here.

3 shows a state in which the first plunger 120 and the second plunger 130 are moved to the left by the control unit 151 described above with reference to FIG. It can provide power to the connected external machine. The principle of the piston movement of the first plunger 120 and the second plunger 130 will be described in detail with reference to FIG.

4 is an enlarged view of a part of a sectional view of a hydraulic cylinder according to an embodiment of the present invention.

4, a hydraulic cylinder 100 according to an embodiment of the present invention may include a cylinder tube 110, a first plunger 120, a second plunger 130, and a connecting portion 140, The cylinder tube 110 may further include an operating oil 111, a pressure supply unit 112, and an end cap 113. The first plunger 120 may further include a first impeller 121, a first motor 122 and a first front end 123. The second plunger 130 may include a second impeller 131, a second motor 132, and a second front end 133. 4, the first front end 123 may be a circular cross-section adjacent the first impeller 121 and the second front end 133 may be a circular cross-section adjacent to the second impeller 131, have.

The first motor 122 and the second motor 132 may be driven by the control unit 151 of FIG. 2 and the first motor 122 may rotate the first impeller 121 , And the second motor 132 may rotate the second impeller 131.

4, when the first impeller 121 rotates under the control of the controller 151, the hydraulic oil 111 around the first impeller 121 moves upward and downward of the first impeller 121 The density of the hydraulic oil 111 around the first impeller 121 is instantaneously lowered. As a result, the pressure (hydraulic pressure) of the hydraulic oil 111 applied to the front end portion 123 of the first plunger 120 is reduced. In this case, the pressure applied to the second front end portion 133 of the second plunger 130 The pressure applied to the second front end portion 133 becomes greater than the pressure applied to the first front end portion 123 so that the second plunger 130 moves to the left side, As shown in Fig.

In contrast, when the second impeller 131 is rotated by the control of the control unit 151, the hydraulic oil 111 around the second impeller 131 moves and the front end 133 of the second plunger 130 moves, Thereby reducing the hydraulic pressure applied to the engine. Accordingly, since the pressure applied to the first front end portion 123 is greater than the pressure applied to the second front end portion 133, the first plunger 130 moves to the right and is discharged to the outside of the cylinder tube 110 do.

The hydraulic cylinder 100 according to the embodiment of the present invention is configured such that the impellers 121 and 131 provided adjacent to the front ends 123 and 133 of the respective plungers 120 and 130 are rotated The piston 121 and the plungers 120 and 130 can perform the piston movement by giving a difference in the hydraulic pressure applied to the front end portions 123 and 133 of the plungers 120 and 130, respectively.

When the first plunger 120 is discharged to the outside of the cylinder tube 110 under the control of the controller 151, the second plunger 130 is inserted into the cylinder tube 110 by the connecting portion 140 . That is, the second plunger 130 coupled by the connecting portion 140 can be inserted into the cylinder tube 110 as the first plunger 120 protrudes to the outside of the cylinder tube 110. When the second plunger 130 is discharged to the outside of the cylinder tube 110 under the control of the controller 151, the first plunger 120 is inserted into the cylinder tube 110 by the connecting portion 140 . That is, the first plunger 120 can be inserted into the cylinder tube 110 by the connecting portion 140 as the second plunger 130 protrudes to the outside of the cylinder tube 110.

The first plunger 120 and the second plunger 130 are formed such that the first plunger 120 and the second plunger 130 occupy an internal space of the cylinder tube 110 The operating fluid 111 does not need to be further injected into the inner space of the cylinder tube 110 even when the piston of the first plunger 120 and the second plunger 130 moves, 0.0 > 111 < / RTI >

The first impeller 121 and the second impeller 131 are formed in the form of a spindle and the first impeller 121 and the second impeller 131 are formed in the periphery of the hydraulic oil 111, It is obvious that the impeller can be changed into various types of impellers such as a rotary type, a propeller type, a row type, a screw type and a turbine type.

5 is a view showing a hydraulic cylinder according to another embodiment of the present invention. The hydraulic cylinder according to another embodiment of the present invention shown in FIG. 5 is similar in construction to the hydraulic cylinder 100 according to the embodiment of the present invention described above with reference to FIGS. 1 to 4, As shown in FIG.

5, the sieve 160 included in the hydraulic cylinder according to another embodiment of the present invention has a predetermined angle (for example, 90 degrees) with respect to the through-hole direction of the internal space of the cylinder tube 110, And may be coupled to the connection portion 140. The sieve 160 may be formed in the form of a net including a plurality of through holes to reduce a swirling phenomenon of the hydraulic oil 111.

As described above with reference to FIG. 4, when the first impeller 121 rotates, the hydraulic oil 111 around the first impeller 121 moves up and down. When the hydraulic oil 111 thus moved moves up and down in the second impeller The pressure difference between the first front end 123 and the second front end 133 is canceled by the first plunger 131 and the second plunger 130 and the pressure difference between the first plunger 120 and the second plunger 130 is canceled The piston motion may not be performed smoothly. This phenomenon may occur in the same way when the second impeller 130 rotates.

Therefore, the sieve 160 can suppress the swirling phenomenon of the hydraulic oil 111 generated by the rotation of the first impeller 120 and the second impeller 130, thereby facilitating smooth piston movement.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

100: Hydraulic cylinder 110: Cylinder tube
111: hydraulic oil 112: pressure supply part
113: End cap
120: first plunger 121: first motor
122: first impeller 123: first front end portion
130: second plunger 131: second motor
132: second impeller 133: second front end portion
140:
150: Operation part 151: Control part
152: interface unit 153:
160: Filter

Claims (9)

A cylinder tube penetrated to both sides so as to have a receiving space therein;
A first plunger inserted into the accommodation space through the one side of the cylinder tube;
A second plunger inserted into the accommodation space through another side passage of the cylinder tube;
A first impeller coupled to a front end of the first plunger in a direction in which the first plunger is inserted,
A second impeller coupled to a front end of the second plunger in a direction of insertion,
A connecting portion interconnecting the first plunger and the second plunger in a receiving space of the cylinder tube; And
And a pressure supply unit for supplying pressure to the working fluid filled in the accommodating space of the cylinder tube. The method according to claim 1,
Wherein the first plunger and the second plunger include a first motor and a second motor, respectively,
Wherein the first motor and the second motor rotate the first impeller and the second impeller, respectively. 3. The method of claim 2,
And an actuating part connected to the first plunger and the second plunger protruding outside the cylinder tube. The apparatus according to claim 3,
A controller for rotating the first impeller through the first motor when the external discharge command of the second plunger is inputted and rotating the second impeller through the second motor when an external discharge command of the first plunger is inputted, Wherein the hydraulic cylinder is a hydraulic cylinder. 5. The method of claim 4,
When the first impeller rotates, the pressure applied to the front end of the first plunger is reduced so that the second plunger is discharged to the outside of the cylinder tube. When the second impeller rotates, the front end of the second plunger And the first plunger is discharged to the outside of the cylinder tube. 6. The method of claim 5,
Wherein when the first plunger is discharged to the outside of the cylinder tube, the second plunger is inserted into the cylinder tube by the connecting portion, and when the second plunger is discharged to the outside of the cylinder tube, Wherein the first plunger is inserted into the cylinder tube to maintain a constant volume occupied by the first plunger and the second plunger in the internal space of the cylinder tube. 2. The apparatus according to claim 1,
And the second end portion is embedded in one region of the cylinder tube. The method according to claim 1,
Wherein the cylinder tube is a cylindrical body, and the both side bores include an end cap. The hydraulic control apparatus according to claim 1,
Further comprising a plurality of through holes coupled to the connecting portion to reduce swirling of the hydraulic fluid.

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