JPH04210389A - Hydraulic drifter device - Google Patents

Abstract

PURPOSE:To prevent a large pressure loss due to the inertia of an oil flow speed and the heat generation accompanied thereby, by flowing a pressure liquid discharged from a pump in one direction at all times. CONSTITUTION:When a solid spool 78 of a pilot valve 64 communicates the 1st, 2nd ports of the pilot valve 64 and also is arranged at the position closing 3rd, 4th ports, the pressure liquid discharged from a pump is flowed into a 2nd pressure room 70 via a 1st pressure room 56, 1st and 2nd ports. Therefore a piston 54 is moved in a backward direction. Then the position of the solid spool 78 of the pilot valve 64 is changed over with the action of the pressure liquid to close the 1st, 2nd ports of the pilot valve 64 and also arranged at the position communicating the 3rd, 4th ports, the pressure liquid discharged from the pump is fed into a 1st pressure room 56 to move the piston 54 in the forward direction. In this case the pressure liquid inside a 2nd pressure room 70 is drained to a tank 73A via 3rd and 4th ports.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a hydraulic drifter device, in which a piston is reciprocated by pressure fluid used for drilling holes in rocks, etc., and the impact energy of the piston is This invention relates to a hydraulic drifter device that repeatedly applies striking force to a swing rod having a bit at its tip.

[Conventional technology]

In general, a hydraulic drifter device is configured to reciprocate a piston 12 in the axial direction under the control of a pilot valve IO shown in FIG. 5 to apply a striking force to a negative rod 14.

■In operation, the pressure liquid discharged from the pump 16 has a flow rate of v&1.
At the same time, the oil in the second pressure chamber 22 is returned to the tank 27 via the flow path 24, the pilot valve 10, and the flow path 26. This moves the piston 12 to the right (outward stroke). When the valve moves a predetermined distance I (up to port 23), first pressure chamber 20 and port 23 communicate with each other, and the pressure fluid is guided to port 10A of pilot valve 10 (see FIG. 6) via flow path 21. This causes the spool 11 to move rightward in FIG. Therefore, the flow path 24 communicates with the flow path 23, and the pressure liquid discharged from the pump 16 acts on the first pressure chamber 20 and also acts on the flow path 23.
3. It is also supplied into the second pressure chamber 22 via the pilot valve 10 and the flow path 24. In this case, since the area receiving the pressure of the first pressure chamber 20 is smaller than the area receiving the pressure of the second pressure chamber, the piston 12 moves to the left due to the differential pressure (return stroke). Therefore, the oil in the first pressure chamber 20 flows backward through the flow path 18 and merges into the flow path 23 .

As a result, the piston 12 reciprocates and strikes the negative rod.

■On the other hand, if the bit 28 connected to the shank rod 14 is away from the rock to be excavated (not shown) when the piston 12 hits the shank rod 14, or if the rock to be excavated is weak, a dry striking phenomenon occurs. happens. In the case of dry firing, the impact force acts on the hydraulic drifter main body, which may damage the main body attachment, especially the device supporting the shank rod.

In addition to the above-mentioned cases, blank firing may also be done intentionally. This is done by drilling a deep hole and tightening it from the hole wall.
9) or when unscrewing the rod 29.

Therefore, methods have been devised to prevent the hydraulic drifter device from being damaged due to dry firing. According to this, the spline protrusion 31 of the shank rod 14, which has received the impact force, moves by a predetermined amount and strikes the absorber piston 30. At this time cylinder 3
2 is filled with oil, and the oil is led to the accumulator 36 via the flow path 34, so the introduced oil flows into the N2 of the accumulator 36 exclusively for dry firing.
It is cushioned by the compression of gas and prevents the generation of enormous force.

[Problem to be solved by the invention]

However, the conventional hydraulic drifter device is
, ■There are the following problems.

In the case of (2), supply to the first pressure chamber 20 and discharge from the first pressure chamber 20 are performed only through the flow path 18, and the second pressure chamber 22
Since the oil is supplied to and discharged from the second pressure chamber 22 only through the flow path 24, the flow direction of the oil within the flow path 18 and the flow path 24 must be reversed rapidly within a very short period of time. No. Therefore, when the flow direction changes, a large pressure loss and associated vibration and heat are generated due to the inertia of the oil flow velocity.

In the case of (2), as shown in FIG. 5, a dedicated akinimulator is required, and the cylinder 32 of the shock absorbing means is connected to the flow passages 34, 38, and 40 through three ports. The flow of pressure fluid is diffused and an oil pool is generated inside the cylinder 32 and the accumulator 3.
The oil inside 6 leaks out and cannot be replaced effectively.

Therefore, local heat is generated due to the oil accumulated in the cylinder 32 and the akinimulator 36, so t! ! The opposition effect is reduced.

Therefore, there is a problem that the operating efficiency is lower than (1) and (2).

The present invention has been developed in view of the above circumstances, and an object of the present invention is to provide a hydraulic drifter device that can improve operating efficiency.

Means for Solving the Problem = In order to achieve the above object, the present invention reciprocates the piston using hydraulic pressure via a pilot valve that controls the direction of the piston, and uses the impact energy of the piston to drive a bit at the tip. In a hydraulic drifter device that drills holes in rock, etc. by applying repeated impact vibrations to a rock,
A first pressure chamber for moving the piston in the forward direction is provided with two ports, one port is communicated with the pump that discharges the hydraulic pressure, and the other port is connected to the first port of the pilot valve, and the piston is moved in the forward direction. two ports are provided in a second pressure chamber that moves in the return direction, and the two ports are connected to the second and third ports of the pilot valve, respectively;
A fourth port of the pilot valve communicates with a drain tank, and a solid spool of the pilot valve connects the first port to the drain tank.
be arranged alternately in a position where the second port is communicated with the third and fourth ports, and a position where the first and second ports are closed and the third and fourth ports are communicated with each other; It is characterized by

In addition, in order to achieve the above-mentioned purpose, the present invention reciprocates the piston using hydraulic pressure via a pilot valve that controls the direction of the piston, and uses the impact energy of the piston to repeatedly move the piston to the piston rod equipped with a bit at the tip. In a hydraulic drift cooling device for drilling a hole in rock or the like by applying impact vibration, a shock absorbing means is slidably fitted into the shank rod, and a ring chamber of the shock absorbing means is provided with first and second ports. The first port is connected to a drain tank through a first orifice, and the second port is connected to a pressure storage tank and to a pump for discharging hydraulic pressure through an cylinder having a second orifice. The cylinder chamber is characterized in that the cylinder chamber is provided with a shock absorbing means, and when the negative rod is blankly struck, a protrusion formed on the negative rod comes into contact with the impact absorbing means and the cylinder chamber is compressed.

[Effect]

According to the present invention, when the solid spool of the pilot valve is placed in a position where it communicates with the first and second ports of the pilot valve and closes the third and fourth ports, the pressure fluid discharged from the pump flows into the second pressure chamber through the first pressure chamber and the first and second ports. Therefore, the piston moves in the backward direction.

Next, the position of the solid spool of the pilot valve is switched by the action of the pressure fluid, and it is placed in a position where it closes the first and second ports of the pilot valve and communicates with the third and fourth ports. The pressure liquid discharged from the pump is supplied into the first pressure chamber and moves the piston in the forward direction. In this case, the pressure liquid in the second pressure chamber is drained to the tank via the third and fourth ports. Therefore, when the piston moves back and forth, the pressure fluid discharged from the pump only flows in one direction.

Further, according to the present invention, the first port provided in the cylinder chamber of the shock absorbing means communicates between the drain tank and the cylinder chamber, and the second port communicates between the pressure accumulator tank and the cylinder chamber, so that the pressure accumulator tank and the drain tank are connected. Because of the communication, there is no need for a dedicated accumulator, and the flow of pressure fluid within the cylinder chamber becomes smooth, allowing efficient exchange of pressure fluid. Therefore, it is possible to prevent local heat generation within the cylinder chamber due to accumulation of pressure fluid.

C Embodiment] Preferred embodiments of the hydraulic drifter device according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows the state after a striking piston 54, which is slidably provided in a cane blower 52 of a hydraulic drifter device 50, strikes a negative rod 90, which will be described later. In this case, spool 78 of viroft valve 64 is located to the left of pilot valve 64 and port 64. C and 6
4E and communicates between ports 64E and 64F.

Therefore, pressure fluid is supplied from the pump 60 to the first pressure chamber 56, and the piston 54 moves to the right.

In addition, 53A and 53B in FIG. 1 are seal members for preventing oil leakage.

FIG. 2 shows a state in which the piston 54 is in the forward direction. In this case, the first pressure chamber 56 and the port 64A are communicated via the flow path 75, and the spool 78 is on the verge of being moved from the left direction to the right direction. FIG. 3 shows a state in which the spool 78 has moved to the right, in which case the ports 64C and 64E are in communication with each other, and the port 64
B is blocked.

FIG. 4 shows a state in which the pressure fluid from the pump 60 is supplied to the second pressure chamber 70 through the connected ports 64C and 64E, and the piston 54 moves in the return direction and strikes the shank rod 90. has been done.

Further, the akinimulator 76 shown in FIGS. 1 to 4 has a function of adjusting the pressure and flow rate of the first pressure chamber 56, the second pressure chamber 70, etc.

Furthermore, as shown in FIG. 1, the aforementioned shank rod 90 is slidably provided on the caning 52 coaxially with the piston 54. A bit 128 is provided at the front end of the shank rod 90.
A spline 90A that engages with the rotating member 92 is formed on the outer periphery of the rotating member 92, and a gear 92A is formed on the outer periphery of the rotating member 92. This gear 92A engages with a gear 94, which is coaxially fixed to a drive shaft of a motor 96. Therefore, when the motor 96 rotates, the seven-way rod 90 rotates via the gear 94 and the rotating member 92.

Furthermore, the shank rod 90 is slidably provided on the damper ring 98. The damper ring 98 has an inclined surface 98A formed at the right end in FIG.
The spline 90Δ of the shank rod when dry firing
The left end of the two contacts.

Further, the damper ring 98 is slidably provided on the first cylindrical body 100 and forms a cylinder chamber 102 together with the cylindrical body 100. The cylinder chamber 102 is communicated with a left chamber 107 of the sub-cylinder 106 via a flow path 104.

The second cylindrical body 108 of the sub-cylinder 106 has a piston 1
20 is installed slidably in the left and right direction. An orifice 122 is formed in the piston 120, and the orifice 122 communicates the right chamber 124 and the left chamber 107. As a result, the pressure fluid from the pump 60 is transferred to the cylinder chamber 102.
Guided within.

Further, the right chamber 124 is communicated with the accumulator 76 via a flow path 12G.

The operation of the hydraulic drifter device according to the present invention constructed as described above will be explained.

First, the forward direction (non-impacting process), that is, the spool 78
A case will be described in which the flow path 62 and the flow path 72B are blocked at position 1 (left side position) in FIG. 1. When the pump 60 is driven to discharge pressure fluid from the hydraulic pump 60, the discharged pressure fluid flows through the supply channel 58 to the first
It is supplied to the pressure chamber 56 and moves the piston 54 in the right direction (outward direction). As the piston 54 moves to the right, the oil in the second pressure chamber 70 flows through the flow path 72A1 and the pilot valve 6.
The liquid is discharged to the tank 73A through the four ports 64B and 64F and the flow path 73.

Next, the return direction (impacting process) will be explained.

When the piston 54 moves a predetermined amount to the right (outward direction), the first pressure chamber 56 and the stroke regulating port 75A communicate with each other, and as shown in FIG. The pressure fluid is guided to the port 64A of the pilot valve 64 through the flow path 75, and
The spool 78 moves to the right under the action of the pressure fluid guided by the spool 78 (see FIG. 3). This switches the position of the spool 78 to the right. Therefore, as shown in FIG.
Pressure chamber 56, flow path 62, port 64 of pilot valve 64
C, 64E and the second pressure chamber 70 via the flow path 72B.

Here, the pressures in the first pressure chamber 56 and the second pressure chamber 70 are the same, and the diameter of the right end 54B of the piston 54 is the same as that of the left end 54A.
Since the diameter of the piston 54 is smaller than the diameter of the piston 54, the piston 54 moves to the left due to the pressure receiving area and enters the striking process. Then, as shown in FIG. 4, the piston 54 hits the shank rod 90.

At the same time, the flow path 75 is blocked from communicating with the first pressure chamber 56 by the piston 54, and the piston 5
It communicates with the central groove 54C of No. 4. Therefore, the oil in the flow path 75 is drained into the tank 73A via the central groove 54C1 and the flow path 72C. This eliminates the force that would cause spool 78 to move to the right. On the other hand, the pressure liquid discharged from the pump 6Q flows through the flow path 58, the first pressure chamber 56, and the flow path 62.74.
and acts on the right end side of the spool 78 via the port 64D. Here, since the right end of the spool 78 has a larger diameter than the left end, the spool 78 moves to the left and the pilot valve 64 is switched to the state shown in FIG.
4 moves to the right again as described above.

As described above, according to the hydraulic drifter device of the present invention, the oil in the supply passage 58 always flows in one direction from the pump 60 to the first pressure chamber 56 when the piston 54 reciprocates. Furthermore, since the accumulator 76 is communicated with the flow path 62, the flow velocity of the pressure liquid in the supply flow path 58 does not change. Similarly, the flow of the pressure liquid in the flow path 62 is always in one direction, so the direction of the flow does not change, so there is no pressure loss due to changes in the direction of the pressure liquid, and efficient operation is possible.

In addition, since the impact process is equipped with two flow paths 72A and 72B, there is no change in the direction of the pressure fluid due to switching of the pyrotechnic valve 64), so there is no pressure loss and the operating efficiency is improved. can be improved.

Next, a case where a blank hit occurs during the hitting process will be explained. As shown in FIG. 4, when the piston 54 moves to the left and strikes the yang rod 90, the shank rod 90 escapes to the left and the left end of the spline 90A comes into contact with the inclined surface 98A of the damper ring 98. Therefore,
Since the damper ring 98 moves to the left, the oil in the cylinder chamber 102 flows through the flow path 104 to the sub cylinder 1.
06's left ventricle 107.

The oil led to the left chamber 107 is then transferred to the piston 120.
move to the right. Due to the rightward movement of the piston 120, the oil in the right chamber 124 of the sub-cylinder 106 flows into the flow path 1.
26 to the Akineem daughter 76. Therefore, during dry firing, the oil in the cylinder chamber 102 absorbs energy in the accumulator 76 via the sub-cylinder 106, so that the cushioning properties are improved.

Further, by providing the orifice 122 in the piston 120 of the sub-cylinder 106, the number of flow paths communicating with the cylinder chamber 102 is reduced to two, and the oil in the akinimulator 76 and the cylinder chamber 102 can be exchanged effectively. can. Therefore, it is possible to prevent oil from accumulating in the cylinder chamber 102 and to prevent localized heat generation.

In the above embodiment, a hydraulic drifter device that strikes in the horizontal direction has been described, but the present invention is not limited to this, and the present invention can also be applied to a hydraulic drifter device that strikes in the vertical direction.

[Effects of the Invention] As described above, according to the hydraulic drifter device of the present invention, the pressure fluid discharged from the pump always flows in one direction, so there is a large pressure loss due to the inertia of the oil flow rate and the accompanying heat loss. Occurrence can be prevented.

Further, since a dedicated accumulator as a shock absorbing means is not required and the pressure liquid in the ring chamber of the shock absorbing means can be effectively exchanged, local heat generation caused by pooling of pressure liquid can be prevented.

Therefore, it is possible to improve the operating efficiency of the hydraulic drifter device.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of a hydraulic drifter device according to the present invention, FIGS. 2 to 4 are state diagrams showing its operating state, and FIG. 5 is an overall configuration diagram of a conventional hydraulic drifter device. Figure 6 is an enlarged view of the main part. 50... Hydraulic drifter device, 54.120... Piston, 56... First pressure chamber,
58.62.72A, 72B, 73... flow path, 60.
...Pump, 64...Pilot valve, 7
0...Second pressure chamber, 73A...Tank, 76...
・・Accumulator, 90 ・・Nyankurotsud, 9
0A...Spline, 98...Dumber ring, 100.108...Cylinder body, 102...In cylinder chamber, 106...Sub cylinder.

Claims (2)

[Claims] (1) Hydraulic pressure uses hydraulic pressure to move the piston back and forth through a pilot valve that controls the direction of the piston, and uses the impact energy of the piston to repeatedly apply impact vibration to a shank rod with a bit at the tip to drill holes in rock, etc. In the drifter device, two ports are provided in a first pressure chamber that moves the piston in the forward direction, one port is communicated with the pump that discharges the hydraulic pressure, and the other port is connected to the first port of the pilot valve. A second pressure chamber for moving the piston in the return direction is provided with two ports, and the two ports are connected to the second and second pressure chambers of the pilot valve, respectively.
the fourth port of the pilot valve is connected to a third port, and the fourth port of the pilot valve is connected to a drain tank, and the solid spool of the pilot valve closes the first and second ports in the forward direction of the piston. and a position where the piston communicates with the first and second ports and a position where the piston communicates with the first and second ports and closes the third and fourth ports in the return direction of the piston. A hydraulic drifter device characterized by: (2) Hydraulic pressure uses hydraulic pressure to reciprocate through a pilot valve that controls the direction of the piston, and uses the impact energy of the piston to repeatedly apply impact vibrations to a shank rod with a bit at its tip to drill holes in rock, etc. In the drifter device, the shock absorbing means is slidably fitted into the shank rod, and the cylinder chamber of the shock absorbing means is provided with first and second ports, and the first port is connected to the shock absorbing means through the first orifice. The drain tank is contacted,
A shock absorbing means is provided, the second port of which is communicated with the pressure accumulator and the pump that discharges the hydraulic pressure via a sub-cylinder having a second orifice, so that when the shank rod is struck dry, the shank rod is A hydraulic drifter device characterized in that the formed protrusion comes into contact with the shock absorbing means and the cylinder chamber is compressed.