WO2013187691A1

WO2013187691A1 - Hammer raising device

Info

Publication number: WO2013187691A1
Application number: PCT/KR2013/005180
Authority: WO
Inventors: 이종직
Original assignee: 주식회사 신우중공업
Priority date: 2012-06-14
Filing date: 2013-06-12
Publication date: 2013-12-19
Also published as: DE112013002983B4; KR101327392B1; JP2015519215A; JP6200496B2; CN104364458B; US20150144369A1; DE112013002983T5; CN104364458A

Abstract

The present invention relates to a hammer raising device, and more specifically relates to a hammer raising device for eliminating fluid resistance and so increasing the striking strength when a piston that has ascended up moves down. To this end, the hammer raising device of the present invention comprises: a hydraulic pressure control valve for controlling the supply of fluid; a sub-cylinder which receives a supply of fluid due to operation of the hydraulic pressure control valve; a sub-piston of which part is accommodated in the sub-cylinder and which rises or descends due to the fluid; a main piston which is intimately attached to an end of the sub-piston so as to rise due to the rising of the sub-piston, and descends when the end of the intimately attached sub-piston is distanced; and a main cylinder which accommodates the main piston.

Description

Hammer lift device

The present invention relates to a hammer lift device, and more particularly, to a hammer lift device to increase the striking strength of the piston by excluding fluid resistance in the piston and the main cylinder when the piston is moved upward.

In general, the hammer is mounted on equipment such as an excavator and a loader having a hydraulic pump to control the high-pressure fluid supplied from the hydraulic pump with a predetermined flow path and a valve to raise and lower the piston installed inside the hydraulic hammer. It is a device that causes the tool to crush a rock, and the tool breaks a rock or concrete floor.

1 shows a conventional hydraulic hammer. Hereinafter, the configuration and operation of a conventional hydraulic hammer will be described in detail with reference to FIG. 1.

According to FIG. 1, the hydraulic hammer comprises a valve, an accumulator, a cylinder, a piston and a filling gas reservoir. Of course, other configurations than the above-described configuration may be included in the hydraulic hammer is obvious.

When the valve 100 is open, the high pressure fluid supplied from the hydraulic pump flows into the cylinder 102. When a high pressure fluid flows into the cylinders 99, the piston 102, which is accommodated inside the cylinders 108, is raised by the pressure of the incoming fluid.

As shown in FIG. 1, the piston 102 has a cylindrical shape, and has a shape in which a central portion protrudes. The cylinder 108 maintains a through shape for accommodating the piston 102 therein, and induces vertical movement of the piston 102. In addition, the cylinder 108 does not form the same diameter of the through hole so that the piston 102 having a shape in which the central portion protrudes can move up and down within a certain range. That is, the area where the protruding portion of the piston 102 moves up and down forms a larger diameter of the cylinder through hole than other areas. Of course, it is important for the hydraulic hammer to completely close the gap between the piston 102 and the cylinder 108 so that the high pressure fluid does not flow out through the gap between the piston 102 and the cylinder 108.

As the piston 102 is raised, the gas stored in the filling gas reservoir 106 formed at the top of the cylinder is gradually compressed. When the piston 102 is raised to the set position by the hydraulic pressure, the valve 100 is closed, and then the piston moves downward by the force of the piston 102 itself and the force of the gas compressed in the filling gas storage unit 106. Done.

In this case, the fluid between the cylinder and the piston is moved to the accumulator 104. As described above, the conventional hydraulic hammer breaks the rock or concrete ground by repeating the above-described operation.

However, the conventional hydraulic hammer uses a sealing member at the lower end so that the high pressure fluid does not escape into the gap between the piston and the cylinder, thereby reducing the acceleration of the cylinder moving downward by friction between the piston and the cylinder. In addition, the sealing member 88 at the lower end, which is a sealing member for sealing the piston and the cylinder, is damaged by friction, and the damaged member must be periodically replaced to maintain the desired sealing state.

In addition, since the fluid in the cylinder 99 should flow out to the accumulator 104 in an instant when the piston moves downward, the impact strength of the piston is significantly reduced by the resistance generated in this case.

The problem to be solved by the present invention is to propose a method of increasing the impact strength of the piston by increasing the acceleration of the piston moving downward by reducing the friction between the piston and the cylinder.

Another problem to be solved by the present invention is to propose a method that can reduce the management cost without requiring the use of a sealing member formed on the lower end sealing the piston and the cylinder.

Another problem to be solved by the present invention is to propose a method of preventing overheating between the cylinder and the piston, without using a large pipe to reduce the resistance (drain) line.

To this end, the hammer raising device of the present invention is a hydraulic control valve for controlling the supply of the fluid, a sub-cylinder supplied with the fluid by the operation of the hydraulic control valve, a portion is accommodated in the sub-cylinder, the rising or falling by the fluid And a main piston which is in close contact with an end of the sub piston, ascends by the rising of the sub piston, and which is lowered when the ends of the in close contact with the sub piston are spaced apart, and a main cylinder accommodating the main piston.

The hammer lifting device according to the present invention separates the separation between the main cylinder and the main piston by raising the main piston formed inside the main cylinder by using a cylinder and a piston installed outside without introducing fluid into the main cylinder. Do not use the member. As such, by not using a separate sealing member, an acceleration reduction phenomenon may be prevented due to resistance due to frictional force between the main cylinder and the main piston. In addition, there is an advantage that can increase the number of blows of the piston by raising the main piston using a plurality of sub-piston.

In addition, the hammer device of the present invention has the advantage of freely adjusting the moving range of the main piston for hitting. That is, the conventional hammer device has to inject the fluid into the main cylinder, and the amount of the fluid to be added according to the movement range of the main piston, but the hammer device of the present invention does not inject the fluid into the main cylinder, the sub-piston By using it, it is possible to freely adjust the moving range.

1 shows a conventional hydraulic hammer,

Figure 2 shows a hammer device according to an embodiment of the present invention,

Figure 3 shows a hammer device according to another embodiment of the present invention,

Figure 4 shows the structure of the main piston lifting device according to an embodiment of the present invention.

The foregoing and further aspects of the present invention will become more apparent through the preferred embodiments described with reference to the accompanying drawings. Hereinafter will be described in detail to enable those skilled in the art to easily understand and reproduce through this embodiment of the present invention.

2 illustrates a hammer device according to an embodiment of the present invention. Hereinafter, a hammer device according to an embodiment of the present invention will be described in detail with reference to FIG. 2.

According to FIG. 2, the hammer device comprises a hydraulic control valve, a main cylinder, a main piston, a sub cylinder, a sub piston, and a filling gas reservoir. Obviously, other configurations may be included in the hammer device in addition to the above-described configuration.

The hydraulic control valve 200 controls the movement of the fluid formed at a high pressure supplied from the hydraulic pump. When the hydraulic control valve 200 is opened, the fluid supplied from the hydraulic pump is supplied to the sub cylinder 202. The high pressure fluid supplied to the sub cylinder 202 raises the sub piston 204 present in the sub cylinder 202. The sub piston 204 is in close contact with the lower end of the protruding portion of the main piston 206, and the main piston 206 is also raised by the rising of the sub piston 204.

The main piston 206 is in the form of a cylinder and has a shape in which the central portion protrudes. The main cylinder 208 has a through shape to accommodate the main piston 206 therein, and induces vertical movement of the main piston 206.

In addition, the diameter of the through hole is not equal to the main piston 206 having the shape in which the central portion protrudes (protrusion) so that the main piston 206 can move up and down within a certain range. That is, the area where the protruding portion of the main piston 206 moves up and down forms a larger diameter of the through hole of the main cylinder 208 than other areas. The vertical movement range of the main piston 206 in the main cylinder 208 may be variously manufactured according to the manufacturer's intention. The present invention eliminates the need for a bottom seal between the main piston and the main cylinder by raising the main piston using the sub piston.

As the main piston 206 is raised, the gas stored in the filling gas storage unit 210 formed at the top of the main cylinder 208 is compressed. When the main piston 206 ascends to the set position in the main cylinder 208, a switching valve (not shown) is operated. According to the operation of the switching valve, the sub piston 204 is released from the lower end of the main piston 206, and when the sub piston 204 is released, the main piston 206 is the main piston 206 load and the filling gas It is moved downward by the force of the compressed gas stored in the storage unit 210. Of course, the hydraulic control valve 200 is closed at the same time the switching valve is operating. In this case, as described above, the friction force is not generated between the main piston 206 and the main cylinder 208, and thus the acceleration of the main cylinder moving downward is increased as compared with the conventional art.

In addition, as described above, the vertical movement range of the main piston in the main cylinder can be variously manufactured according to the intention of the manufacturer, and if necessary, the impact strength generated by the main piston can be increased by increasing the movement range. In contrast, the conventional hydraulic hammer has a disadvantage in that the size of the accumulator and the fluid to be supplied must be increased in order to adjust the vertical movement range of the piston in the cylinder.

The sub piston 204 separated from the main piston 206 moves downward, and the sub piston moved downward raises the main piston again.

2 illustrates that the central portion of the main piston protrudes, but is not limited thereto. That is, the central portion of the main piston may form a groove in a predetermined depth, and the sub piston may raise the main piston by using the formed groove.

3 illustrates a hammer device according to another embodiment of the present invention. Hereinafter, another hammer device according to another embodiment of the present invention will be described in detail with reference to FIG. 3.

According to FIG. 3, the hammer device includes a first hydraulic control valve, a second hydraulic control valve, a main cylinder, a main piston, a first sub cylinder, a second sub cylinder, a first sub piston, a second sub piston, and a filling gas storage unit. Include. Obviously, other configurations may be included in the hammer device in addition to the above-described configuration.

The first hydraulic control valve 300 controls supplying the fluid formed at a high pressure supplied from the hydraulic pump to the first sub cylinder 302. The second hydraulic control valve 320 controls supplying the fluid formed at a high pressure supplied from the hydraulic pump to the second sub cylinder 312.

When the first hydraulic control valve 300 is opened, the fluid supplied from the hydraulic pump is supplied to the first sub cylinder 302. When the second hydraulic control valve 320 is opened, the fluid supplied from the hydraulic pump is supplied to the second sub cylinder 312. In connection with the present invention, the first hydraulic control valve 300 and the second hydraulic control valve 310 are not opened at the same time but open alternately.

The high pressure fluid supplied to the first sub cylinder 302 raises the first sub piston 304 present in the first sub cylinder 302. The first sub piston 304 is in close contact with the lower end of the protruding portion of the main piston 306, and the main piston is also raised by the rising of the first sub piston 304.

As the main piston 306 rises, the gas stored in the filling gas storage unit 310 formed above the main cylinder 308 is compressed. When the main piston 306 is raised to the set position, the first switching valve (not shown) is operated. According to the operation of the first switching valve, the first sub piston 304 is separated from the lower end of the main piston 306, and when the first sub piston 304 is released, the main piston 306 is the main piston 306. ) It moves downward by its own load and the force of the compressed gas stored in the filling gas storage 310. Of course, the first hydraulic control valve 300 is closed at the same time as the first switching valve is operated.

The second sub cylinder 312, the second sub piston 314, and the second switching valve (not shown) also perform the same operations as the first sub cylinder 302, the first sub piston 304, and the first switching valve. do. Of course, as described above, the first drive unit and the second sub cylinder 312, the second sub piston 314, and the second sub cylinder 302, the first sub piston 304, and the first switching valve may be configured. Instead of performing the same operation at the same time, the second drive unit configured as the switching valve alternately performs the operation. By using the plurality of driving units in this way, the number of vertical movements of the main piston can be increased. That is, at least one sub piston of the first sub piston and the second sub piston reaches the lowest point by movement before the main piston reaches the lowest point by lowering, thereby increasing the number of vertical movements of the main piston.

FIG. 3 forms two hydraulic control valves, but is not limited thereto. That is, two sub pistons are operated using one hydraulic control valve.

4 is a view illustrating a lifting method according to the structure of a main piston according to one embodiment of the present invention. Hereinafter, the rising method according to the structure of the main piston according to an embodiment of the present invention will be described in detail with reference to FIG. 4.

According to FIG. 4A, the main piston forms a groove portion, and the main piston raising device 400 is in close contact with the groove portion. The main piston raising device 400 is connected to the end of the sub piston. The main piston raising device 400 is located below the groove, and the main piston lifting device 400 raises the main piston by the rising of the main piston raising device 400. When the switching valve reaches the highest point of the main piston, the main piston raising device 400 is spaced apart from the main piston.

According to FIG.4 (b), the main piston forms the groove part, and the main piston raising device is in close contact with the groove part. The main piston raising device 400 is connected to the end of the sub piston. The main piston raising device 400 is located above the groove, and the main piston lifting device 400 raises the main piston by the rising of the main piston raising device 400. When the switching valve reaches the highest point of the main piston, the main piston raising device 400 is spaced apart from the main piston.

According to Figure 4 (c), the main piston is formed in a 'T' shape, the main piston lifting device 400 is in close contact with the lower end of the 'T'. The main piston raising device 400 is connected to the end of the sub piston. The main piston lifting device is located at the lower end of the 'T' and raises the main piston by the rising of the main piston lifting device. When the peak of the main piston is reached, the main piston raising device is automatically spaced away from the main piston.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. .

(Explanation of the sign)

200: hydraulic control valve, 202: sub cylinder

204: sub piston, 206: main piston

208: main cylinder, 210: filling gas storage

300: first hydraulic control valve, 302: first sub-cylinder

304: first sub-cylinder, 310: filling gas storage unit

312: second sub cylinder, 314: second sub cylinder

Claims

A sub cylinder supplied with fluid by an operation of a hydraulic control valve;

A sub-piston which is accommodated in the sub-cylinder and which is lifted or lowered by the fluid;

A main piston that is in close contact with an end of the sub piston and rises by the rising of the sub piston, and is lowered when the ends of the sub piston that are in close contact are spaced apart;

A main cylinder accommodating the main piston;

And a switching valve for separating the sub piston from the main piston when the main piston reaches the highest movable point in the main cylinder.
The method of claim 1, wherein the sub piston,

A first sub piston, a second sub piston,

And the first sub piston and the second sub piston alternately raise the main piston.