WO2017014596A1

WO2017014596A1 - Hydraulic breaker having two-stage automatic stroke

Info

Publication number: WO2017014596A1
Application number: PCT/KR2016/008041
Authority: WO
Inventors: 박용식; 이정덕
Original assignee: 대모 엔지니어링 주식회사
Priority date: 2015-07-23
Filing date: 2016-07-22
Publication date: 2017-01-26
Also published as: KR101550899B1

Abstract

The present invention relates to a hydraulic breaker having a two-stage automatic stroke, the hydraulic breaker being capable of selecting one from two-stage strokes, which include a long stroke and a short stroke, as the stroke of a piston according to the strength of a bedrock, which is an object to be pulverized, and automatically switching to the same, the hydraulic breaker comprising a valve and a channel, which are used to sense the strength of the bedrock to be pulverized, configured in simple structures such that the improved structure of the hydraulic breaker reduces material costs and factors that may cause malfunctions. The hydraulic breaker having a two-stage automatic stroke according to the present invention comprises: a cylinder having a piston contained therein to be able to move up/down, a high-pressure chamber being provided on the upper portion of the cylinder, the high-pressure chamber being filled with a hydraulic pressure supplied from a pump, a lower-pressure chamber being provided on the middle portion of the cylinder, and a sensing port, a long stroke port, and a short stroke port being provided on the outer side of the cylinder; a control valve provided in a channel between the cylinder and the pump so as to control the direction of supply of the hydraulic pressure; a stroke switching valve having a first channel connected to the upper portion thereof, the first channel being a passage of connection with the high-pressure chamber, a second channel being provided on the lower portion of the stroke switching valve, the second channel being a passage of connection with a tank, and the stroke switching valve selectively connecting a third channel, which connects the control valve and the short stroke port of the cylinder; a fourth channel that connects the long stroke port and the control valve; a bypass channel that connects the first channel and the second channel; and an orifice provided in the bypass channel.

Description

Hydraulic breaker with two-speed automatic stroke

The present invention relates to a hydraulic breaker having a two-stage automatic stroke, and in particular, according to the strength of the rock to be broken can be automatically sensed so as to operate by dividing into a long stroke or short stroke to switch the stroke, and also the automatic sensing structure It relates to a hydraulic breaker having a two-stage automatic stroke whose structure is improved so that it can be configured in a simple structure.

Generally, a hydraulic breaker is widely used for crushing concrete or rock by mounting it on construction equipment such as an excavator or a loader. By breaking the piston up and down by the striking force to crush the concrete and rock.

The hydraulic breaker is composed of a hydraulic cylinder and the piston and the front of the cylinder is attached to the chisel used to break the object.

When the piston is reciprocated by the operation of the cylinder, the chisel is struck and a strong impact is applied to the object, which causes the object to split or break.

The rear end of the hydraulic cylinder is provided with a gas chamber, one side of the surface of the hydraulic cylinder is provided with a valve device for controlling the supply of the fluid required for the operation of the piston, the hydraulic oil is temporarily stored on the surface of the hydraulic cylinder adjacent to the fluid control unit Accumulators are formed for use as energy sources.

The valve device is coupled to the valve housing formed on one side of the hydraulic cylinder, the valve housing for horizontal movement therein through the opening of the valve housing to control the supply of fluid, and to seal the opening in the valve housing and to support the movement of the valve. It consists of a valve cover coupled via a plurality of fastening members.

Existing hydraulic breakers have a constant stroke length regardless of the type and strength of the rock to be crushed when the piston moves up and down. Therefore, the work speed cannot be changed according to the strength of the rock. There is a problem of this deterioration.

Prior art for improving this, as disclosed in Korean Patent Publication No. 10-2015-0034071 "stroke valve for hydraulic breaker control" (published date: 2015.04.02), the piston is formed to be reciprocating, A stroke valve for controlling a hydraulic breaker having a cylinder body in which a plurality of pressure holes are formed to increase or decrease the pressure, the stroke valve being connected to a pressure hole of the hydraulic breaker, and selectively regulating the pressure of each pressure hole to stroke the piston. Is to set the distance.

In addition, as another prior art related to the hydraulic breaker for varying the stroke length is disclosed in Korean Patent Publication No. 10-1138987 "Hydraulic breaker with automatic stroke distance switching function" (registration date: April 16, 2012) The hydraulic breaker includes a crushing depth detector for detecting the crushing depth of the chisel penetrating the crushed object between the cylinder low pressure chamber and the cylinder chamber, and two hydraulic pressure surfaces, and is selectively supplied to one hydraulic pressure surface by the crushing depth detecting unit. And a stroke length switching valve which is positioned by a high-pressure hydraulic fluid and selectively communicates the first cylinder switching chamber and the second cylinder switching chamber, and the crushing depth detecting unit has a piston upper end which varies according to the strength of the crushed object during the crushing operation. High pressure hydraulic oil in the cylinder chamber is optionally provided with two hydraulic surfaces according to the upper surface position of the mirror As the position of the position detection valve is selectively switched by being supplied to one side of the pressure valve of the support valve, the pressure switch of the constant pressure communication channel and the hydraulic pressure surface of the stroke distance switching valve is selectively communicated to the stroke distance switching valve whose position is determined. It is a cylinder control room that allows the automatic stroke distance switching function to be selectively operated.

By the way, the existing prior art is complicated because the flow path and valve structure for sensing the strength of the rock in the process of automatically switching the stroke according to the strength of the rock, not only the failure factor increases but also the cost increases. There is an esoteric issue.

The present invention was made in view of the above-mentioned problems, and an object thereof is to automatically switch the piston stroke by selecting one of the two strokes of the long stroke or the short stroke according to the strength of the rock to be crushed. The hydraulic breaker has a two-stage automatic stroke that has a simple structure of a valve and a flow path that sense the strength of the rock, which is a crushed product. To provide.

In order to achieve the above object, the present invention provides a high pressure chamber in which up and down pistons are built in, a hydraulic pressure supplied from a pump is provided in the upper portion, a low pressure chamber is provided in the middle, and a sensing port on the outside. A cylinder provided with a long stroke port and a short stroke port; A control valve provided in a flow path between the cylinder and the pump and controlling a supply direction of hydraulic pressure; The first passage, which is a connection passage with the high pressure chamber, is connected to the upper portion, and the second passage, which is a connection passage with the tank, is provided at the lower portion, and selectively connects the third passage, to which the control valve and the short stroke port of the cylinder are connected. A stroke selector valve for discharging; A fourth flow path connecting the long stroke port and a control valve; A bypass flow path connecting the first flow path and the second flow path; And an orifice provided in the bypass passage.

The stroke switching valve has a larger area of the lower portion connected to the second passage than the upper portion connected to the first passage.

The stroke switching valve further includes an elastic member for doubling the pressure on the lower side.

The sensing port is disposed in a lower position of the high pressure chamber, a low pressure chamber is disposed below the sensing port, a long stroke port is located below the low pressure chamber, and a short stroke port is provided below the long stroke port. Is placed.

As another characteristic element of the present invention, a piston which is built up and down can be built up and down, and a high pressure chamber in which the hydraulic pressure supplied from the pump is filled in the upper portion, a low pressure chamber is provided in the middle, and a sensing port on the outside, A cylinder provided with a long stroke port and a short stroke port; A control valve provided in a flow path between the cylinder and the pump and controlling a supply direction of hydraulic pressure; A first flow path connected to the high pressure chamber, the first flow path being connected to the upper part, and a stroke switching valve configured to selectively connect the third flow path to which the control valve and the short stroke port of the cylinder are connected; An elastic member provided below the stroke selector valve to provide an elastic bias force to a lower side of the stroke selector valve; A fourth flow path connecting the long stroke port and a control valve; A bypass passage connecting the first passage and the tank; And an orifice provided in the bypass passage.

The present invention can automatically sense the strength of the rock and automatically switch the lifting stroke of the piston to a long stroke or a short stroke stroke according to the sensed rock strength to improve the working speed during the short stroke stroke, as well as automatic sensing and automatic The simple structure of the valve and the flow path required for the conversion has a useful effect of reducing the manufacturing cost and failure factors.

In addition, according to the present invention, the sensing port is disposed at the lower position of the high pressure chamber, and as the long stroke port and the short stroke port are disposed below, the piston two-stage stroke can be easily switched. It has the advantage that the structure can be simply configured.

1 is a hydraulic circuit diagram schematically showing the configuration of a hydraulic breaker having a two-stage automatic stroke according to the present invention.

2 is a configuration diagram showing the operation of the long stroke stroke of the hydraulic breaker of the present invention.

3 is a view showing a state when the hydraulic breaker of the present invention detects the positional movement of the piston during the fracture of the rock with weak strength.

Figure 4 is a view showing a state in which the piston is raised to the stroke stroke position in the short stroke stroke of the hydraulic breaker of the present invention.

5 is a hydraulic circuit diagram schematically showing a second embodiment of a hydraulic breaker having a two-stage automatic stroke according to the present invention.

6 is a hydraulic circuit diagram schematically showing a third embodiment of a hydraulic breaker having a two-stage automatic stroke according to the present invention.

In one embodiment of the hydraulic breaker having a two-stage automatic stroke according to the present invention, referring to Figure 1, there is a built-in up and down piston 150, the hydraulic pressure supplied from the pump 10 is built in A cylinder 100 having a high pressure chamber 110 filled therein, a low pressure chamber in the middle, and a sensing port 102, a long stroke port 104, and a short stroke port 106 provided on the outside thereof; A control valve (50) provided in a flow path between the cylinder (100) and the pump (10) and controlling a supply direction of hydraulic pressure; The first passage 410, which is a connection passage with the high pressure chamber 110, is connected to the upper portion, and the second passage 420, which is a connection passage with the tank 20, is provided at the lower portion, and the control valve 50 A stroke switching valve 300 for selectively connecting the third passage 430 to which the short stroke port 106 of the cylinder 100 is connected; A fourth flow path 440 connecting the long stroke port 104 and the control valve 50; A bypass passage 450 connecting the first passage 410 and the second passage 420; And an orifice 455 provided in the bypass passage 450.

In more detail, the sensing port 102 is disposed at a lower position of the high pressure chamber 110, a low pressure chamber 120 is disposed below the sensing port 102, and a long stroke is provided below the low pressure chamber 120. The port 104 is located, and the short stroke port 106 is disposed below the long stroke port 104.

The high pressure chamber 110 repeatedly operates as a high pressure and a low pressure, but the minimum pressure in the high pressure chamber 110 is maintained higher than the low pressure side acting on the second flow path 420.

The control valve 50 selectively opens and closes the supply passage 460, which is a connection passage connecting the pump 10 and the high pressure chamber 110 to one side, and recovers the fluid in the high pressure chamber 110 to the tank 20 side. A function of selectively opening and closing the recovery passage 470 as a passage is performed.

The first flow passage 410 is provided to connect the sensing port 102 disposed below the high pressure chamber 110 and the upper portion of the stroke switching valve 300 to open the sensing port 102 during the lowering operation of the piston 150. Thus, the fluid in the high pressure chamber 110 is transferred to the upper portion of the stroke switching valve 300.

The stroke switching valve 300 is a two-port two-position valve, in which the third flow path 430 for short stroke operation is cut off when rock crushing having a long stroke is normally performed, and the high pressure chamber 110 passes through the first flow path 410. When the medium and the high pressure fluid is transferred from the flow path is switched to the third flow path 430 is connected.

In addition, the stroke switching valve 300 is provided with a larger area of the lower portion connected to the second passage 420 than the upper portion connected to the first passage 410. For this reason, the stroke switching valve 300 maintains the long stroke position state before the high pressure fluid is supplied from the high pressure chamber 110 to the upper portion.

The fourth flow path 440 is configured to connect the long stroke port 104 and the control valve 50, and the oil in the cylinder 100 to the tank 20 through the control valve 50 and the recovery flow path 470. It will be recovered.

The third flow path 430 is configured to connect the short stroke port 106 and the control valve 50, and is connected when the stroke switching valve 300 is switched, and the fourth flow path 430 is close to the control valve 50 side. Join the flow path 440.

The orifice 455 is for relieving the pressure of the fluid remaining on the upper portion of the stroke switching valve 300 by discharging the fluid in the bypass flow passage 450 at a predetermined cycle, and has a characteristic that the discharge cycle varies depending on the diameter. .

Accordingly, the orifice 455 serves to relieve pressure to switch from the short stroke to the long stroke.

Reference numeral L1 denotes a standard piston contact position corresponding to the height at which the chisel 210 and the piston 150 contact before the crushing operation is performed.

Figure 2 is a configuration diagram showing the operation of the long stroke stroke of the hydraulic breaker of the present invention, the rock crushing process having a long stroke is the hydraulic pressure of the pump 10 through the supply passage 460 and the control valve 50 cylinder 100 Or the hydraulic pressure in the high pressure chamber 110 is recovered to the tank 20 through the control valve 50 and the recovery passage 470, and the long stroke port 104 and As the fluid in the cylinder 100 is recovered through the connected fourth flow path 440, the piston 150 is moved up and down to have a long stroke distance.

At this time, since the sensing port 102, which is selectively connected to the high pressure chamber 110, is closed in the stroke switching valve 300, the third flow path 430 is blocked without the stroke switching valve 300 being switched to the short stroke state. Will remain intact.

Therefore, the long stroke operation of the piston 150 is a rock that is not to be crushed, or if the rock is a strong rock is operated with a long stroke corresponding to the normal stroke length to give a strong hitting force to the rock through the chisel 210 Will be given.

3 is a view showing a state when the position movement of the piston 150 is detected when the rock is weakly broken, and the chisel 210 and the piston 150 are lowered when the rock is broken by the chisel 210. The contact position L2 is lowered below the standard piston contact position L1, and a moving gap is generated by the height L1 from which the chisel 210 is lowered.

At this time, as the piston 150 after the rock is crushed, the high pressure chamber 110 is lowered and the sensing port 102 communicates with the inside of the high pressure chamber 110, and the high pressure is opened through the open sensing port 102. The fluid of the seal 110 is supplied to the upper part of the stroke selector valve 300 so that a pressure greater than the fluid pressure of the lower part of the stroke selector valve 300 is transmitted to the upper part so as to lower the position of the stroke switch valve 300. The third flow path 430 is connected by switching to a short stroke stroke.

Accordingly, the fluid in the cylinder 100 is recovered to the tank 20 through the recovery channel 470 through the open third channel 430, and the hydraulic pressure is selectively applied to the high pressure chamber 110 or the lower part of the cylinder 100. Since the hydraulic circuit is supplied, the fluid flows through the third passage 430 before the fluid in the cylinder 100 is discharged through the long stroke port 104 and the fourth passage 440, and the piston moves up and down. Administration takes place.

4 is a view showing a state in which the piston of the hydraulic breaker of the present invention reaches the short stroke stroke position, the high pressure chamber 110 and the sensing port 102 during the lowering operation of the piston 150 when the rock is crushed repeatedly As communication is opened and the hydraulic pressure is supplied to the upper side of the stroke switching valve 300 through the first flow passage 410 and the short stroke port 106 and the third flow passage 430 are connected, the operation process of the short stroke stroke is performed. Will be repeated.

On the other hand, when crushing a weak rock while crushing a strong rock, it is switched from the short stroke stroke to the long stroke stroke, the process of switching from the short stroke stroke to the long stroke stroke after the sensing port 102 is closed ( As the hydraulic pressure in the first flow passage 410 is discharged to the outside through the orifice 455 of the bypass flow passage 450 after the first flow passage 410 is blocked, the lower area of the stroke switching valve 300 is increased. The stroke selector valve 300 is switched to the long stroke position because it is larger than the upper area.

Accordingly, the present invention can automatically sense the strength of the rock and automatically switch the lifting stroke of the piston 150 to a long stroke or a short stroke stroke according to the sensed rock strength to improve the working speed during the short stroke stroke. In addition, since the valve and the flow path structure required for the automatic sensing and the automatic switching are configured in a simple structure, they are easy to manufacture, and have a useful advantage of reducing manufacturing cost and reducing trouble.

Hereinafter, in another embodiment of the present invention will be described with the same reference numerals for the same components as the components of the above-described line embodiment, and overlapping description will be omitted.

5 is a view showing a second embodiment of a hydraulic breaker having a two-stage automatic stroke according to the present invention, unlike the previous, the stroke switching valve 300 is provided with the hydraulic pressure at the top and the stroke switching valve ( The lower side of the 300 is further provided with an elastic member 500 for doubling the pressure.

The elastic member 500 imparts an elastic force to the lower side of the stroke switching valve 300, the fluid of the high pressure chamber 110 is not supplied to the upper side of the stroke switching valve 300 through the first flow passage (410). By maintaining the long stroke position of the stroke switching valve 300 in normal times, it is possible to replace the function of the second flow path 420, or to switch the stroke stroke more quickly.

Figure 6 is a view showing a third embodiment of the hydraulic breaker having a two-stage automatic stroke according to the present invention, unlike the above-described line embodiment, the second passage 420 is omitted, more specifically the interior Piston 150, which can be moved up and down in the built-in, is provided with a high pressure chamber 110 is filled with the hydraulic pressure supplied from the pump 10 in the upper portion, a low pressure chamber 120 is provided in the middle, sensing outside A cylinder (100) provided with a port (102), a long stroke port (104), and a short stroke port (106); A control valve (50) provided in a flow path between the cylinder (100) and the pump (10) and controlling a supply direction of hydraulic pressure; The first passage 410 is connected to the high pressure chamber 110 and the first passage 410 is connected to the upper portion, and the third passage 430 is connected to the control valve 50 and the short stroke port 106 of the cylinder 100. A stroke switching valve 300 for selectively connecting; An elastic member 500 provided below the stroke switching valve 300 to provide an elastic biasing force to a lower side of the stroke switching valve 300; A fourth flow path 440 connecting the long stroke port 104 and the control valve 50; A bypass passage 450 connecting the first passage 410 and the tank 20; And an orifice 455 provided in the bypass passage 450.

The elastic member 500 imparts elastic force to the lower side of the stroke switching valve 300 instead of hydraulic pressure, and the elastic force of the elastic member 500 is in a state in which the sensing port 102 is closed (pressure is lost in the first passage 410). In a low pressure state) is greater than the hydraulic pressure applied to the upper side of the stroke switching valve (300).

Accordingly, the third embodiment of the present invention has an advantage that the flow path structure can be configured more easily than the first and second embodiments.

The present invention as described above has the technical idea to sense and automatically switch the stroke of the piston in accordance with the strength of the rock, it will be possible to perform any number of modifications within the scope and spirit of the present invention. For example, the present invention may arrange the elastic member on top of the stroke selector valve.

According to the present invention, the piston stroke can be automatically switched by selecting one of the two-stroke stroke of the long stroke or the short stroke according to the strength of the rock to be crushed, and the valve and flow path structure for detecting the strength of the rock to be crushed are simplified. It is possible to provide a hydraulic breaker having a two-stage automatic stroke whose structure is improved to facilitate product practical use and reduce cost and failure factors.

Claims

A piston 150 that can be lifted up and down inside is built therein, and a high pressure chamber 110 in which the hydraulic pressure supplied from the pump 10 is filled in the upper portion is provided, and a low pressure chamber 120 is provided in the middle of the piston. A cylinder (100) provided with a sensing port (102), a long stroke port (104), and a short stroke port (106);

A control valve (50) provided in a flow path between the cylinder (100) and the pump (10) and controlling a supply direction of hydraulic pressure;

The first passage 410, which is a connection passage with the high pressure chamber 110, is connected to the upper portion, and the second passage 420, which is a connection passage with the tank 20, is provided at the lower portion, and the control valve 50 A stroke switching valve 300 for selectively connecting the third passage 430 to which the short stroke port 106 of the cylinder 100 is connected;

A fourth flow path 440 connecting the long stroke port 104 and the control valve 50;

A bypass passage 450 connecting the first passage 410 and the second passage 420; And an orifice (455) provided in the bypass flow path (450).
The method according to claim 1,

The stroke switching valve 300 is a hydraulic breaker having a two-stage automatic stroke, characterized in that the area of the lower portion is connected to the second passage 420 is larger than the upper portion is connected to the first passage (410).
The method according to claim 1,

The stroke switching valve 300 is a hydraulic breaker having a two-stage automatic stroke further comprises an elastic member 500 for doubling the pressure on the lower side.
The method according to claim 1,

The sensing port 102 is disposed at a lower position of the high pressure chamber 110, a low pressure chamber 120 is disposed below the sensing port 102, and a long stroke port (below) of the low pressure chamber 120. A hydraulic breaker having a two-stage automatic stroke, characterized in that 104 is located, the short stroke port 106 is disposed below the long stroke port (104).
A piston 150 that can be lifted up and down inside is built therein, and a high pressure chamber 110 in which the hydraulic pressure supplied from the pump 10 is filled in the upper portion is provided, and a low pressure chamber 120 is provided in the middle of the piston. A cylinder (100) provided with a sensing port (102), a long stroke port (104), and a short stroke port (106);

A control valve (50) provided in a flow path between the cylinder (100) and the pump (10) and controlling a supply direction of hydraulic pressure;

The first passage 410 is connected to the high pressure chamber 110 and the first passage 410 is connected to the upper portion, and the third passage 430 is connected to the control valve 50 and the short stroke port 106 of the cylinder 100. A stroke switching valve 300 for selectively connecting;

An elastic member 500 provided below the stroke switching valve 300 to provide an elastic biasing force to a lower side of the stroke switching valve 300;

A fourth flow path 440 connecting the long stroke port 104 and the control valve 50;

A bypass passage 450 connecting the first passage 410 and the tank 20; And an orifice (455) provided in the bypass flow path (450).