JP7041454B2 - Punch control device - Google Patents

Description

The present invention relates to a perforation control device suitable for a perforation device provided with a shock absorber.

A well-known drilling device includes, for example, a drilling machine A as shown in FIG. 4 as an example. The rock machine A includes a guide shell 8 mounted on the tip of a boom provided on a traveling carriage, a rock machine main body 1 mounted on the guide shell 8 so as to be able to move forward and backward and having a striking / rotating mechanism 3. Have.
The drilling machine main body 1 is installed on the carriage 7 of the guide shell 8, and the chain 9 driven by the feed motor 10 is connected to the carriage 7, and a feed mechanism for advancing and retreating the drilling machine main body 1 is configured. There is. A shank rod 2 is attached to the tip of the rock drill body 1, and a rod 4 having a bit 6 attached to the front end is connected to the front end of the shank rod 2 via a sleeve 5.
Then, the tool is composed of these bits 6, the rod 4, the sleeve 5, and the shank rod 2, and the tool is pressed against the crushing target by the feeding mechanism, and the impact force and the rotational force generated by the striking mechanism and the rotating mechanism are applied. It is designed to be transmitted to the crushed object via a tool to crush the crushed object.

Here, as shown in FIG. 5, the applicant is disposed between the tool (shank rod) 2 and the striking piston 12 and the rock drilling machine main body 1, and the rock drilling machine from the crushing target via the tool 2. A two-stage buffer mechanism DP (hereinafter, also referred to as "dual damper mechanism DP") including a damping piston 17 that buffers the reflected energy transmitted to the main body 1 and a pushing piston 16 that stably presses the tool 2 against the crushing target. ) Has been put into practical use, and the wear of the equipment of the rock drilling machine 1 has been reduced and the striking efficiency has been improved.
In the example shown in the figure, the rock drill main body 1 is provided with a chuck driver 14 that gives rotation to the shank rod 2 via the chuck 13. A chuck driver bush 15 as a transmission member that abuts on the rear end of the large diameter portion of the shank rod 2 is mounted on the chuck driver 14, and a pushing piston 16 and a damping piston as a cushioning mechanism are mounted on the rear side of the chuck driver bush 15. 17 and 17 are arranged.

Further, the applicant proposes a damper pressure control means 22 that controls the operating pressure of the dual damper mechanism DP (that is, the damper pressure DPpr) based on the operating pressure FFpr of the feed mechanism, as shown in FIGS. 4 and 5. is doing.
According to the damper pressure control means 22, the cushioning force of the damping piston 17 (that is, the damping thrust F17 shown in FIG. 5) and the pushing piston 16 have the thrust of the feed mechanism that changes according to the state of the crushing target as parameters. Since the pressing force (that is, the pushing thrust F16 shown in FIG. 5) is automatically adjusted, it is possible to properly exert the damping action and the pushing action.

FIG. 6 shows the details of the damper pressure control means 22.
As shown in the figure, the damper pressure control means 22 includes a pilot proportional control valve 27 and a pressure reducing valve 28. The pilot port of the pilot proportional control valve 27 is connected to the operating line of the feed mechanism, and the pilot port of the pressure reducing valve 28 is connected to the input side of the pilot proportional control valve 27. The input side of the pressure reducing valve 28 is connected to the pump 21 shown in FIG. 5, the discharge side of the pressure reducing valve 28 is connected to the working line of the dual damper DP, and the discharge side of the pilot proportional control valve 27 is connected to the tank. It is connected.

FIG. 7 shows the control characteristics provided by the damper pressure control means 22.
As shown in the figure, the damper pressure DPpr increases linearly as the operating pressure FFpr of the feed mechanism increases. Then, by operating the adjusting mechanism of the pilot proportional control valve 27 and the pressure reducing valve 28, it is possible to change the control characteristics within the region of the gray mask shown in the figure (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2001-341083 Re-table 2015-115105

In recent years, the output of the rock drill has been improved, and the applicant has also developed a hydraulic striking mechanism that switches between high and low pressure in the front and rear chambers to achieve high output (see, for example, Patent Document 2).
However, the front / rear chamber high / low pressure switching hydraulic striking mechanism has better cushioning performance when the piston advances beyond the normal striking point, compared to the front chamber constant high pressure rear chamber high / low pressure switching hydraulic striking mechanism. It can be short.
Here, the situation where the piston advances beyond the normal impact point is when the tip of the tool rushes into a gap or a crush zone, and in such a case, the operating pressure FFpr of the feed mechanism also decreases. That is, as shown in FIG. 7, according to the damper pressure control means 22, when the operating pressure FFpr of the feed mechanism decreases, the damper pressure DPpr also decreases, so that a sufficient pushing action is not exhibited.

Therefore, if a dual damper mechanism equipped with a conventional damper pressure control means is applied to the front / rear chamber high / low pressure switching hydraulic impact mechanism, the pushing action is insufficient when the tip of the tool rushes into a gap or a crush zone. Therefore, a situation occurs in which the pressing force of the tool against the bedrock is insufficient, and in that situation, the piston is not sufficiently decelerated and the tool is hit.
When the piston hits the tool with the tip of the tool not in close contact with the object to be crushed, it is called "blank hitting". The above-mentioned state is the most severe blank hitting state for the tool, and therefore the tool. There is a problem that the life of the piston is shortened.

Therefore, the present invention has been made by paying attention to such a problem, and when the dual damper mechanism is applied to the hydraulic pressure type striking mechanism of the front / rear chamber high / low pressure switching type, the damper action is appropriately exhibited. Another object of the present invention is to provide a drilling control device capable of improving a blank shot state.

In order to solve the above problems, the drilling control device according to one aspect of the present invention has a hydraulic pressure type striking mechanism for switching between high and low pressure in the front and rear chambers, a feed mechanism having a feed motor, and a dual damper having a pushing piston and a damping piston. A drilling control device used in a drilling device comprising a mechanism, the striking pressure control means provided in the working pipeline of the hydraulic striking mechanism and having a first pilot proportional control valve and a first pressure reducing valve. , A damper pressure control means provided in the working line of the dual damper mechanism and having a second pilot proportional control valve and a second pressure reducing valve, and the working line of the feed mechanism from the pump side to the feed motor side. First, the feed pressure adjusting valve and the feed flow rate adjusting valve provided in this order, and the pilot port of the damper pressure control means and the primary passage between the feed flow rate adjusting valve and the feed pressure adjusting valve are interconnected. The pilot passage is provided with a second pilot passage that interconnects the pilot port of the impact pressure control means and the secondary passage between the feed flow rate adjusting valve and the feed motor.

Further, in order to solve the above problems, the drilling control device according to another aspect of the present invention includes a hydraulic pressure type striking mechanism for switching between high and low pressure in the front and rear chambers, a feed mechanism having a feed motor, and a pushing piston and a damping piston. The working pipeline of the dual damper mechanism is a drilling control device used for a drilling device having a damping piston working pipe and a pushing piston working pipe. A striking pressure control means having a first pilot proportional control valve and a first pressure reducing valve provided in the working line of the hydraulic striking mechanism, and a second pilot proportional control means provided in the working line for the damping piston. A damper pressure control means having a control valve and a second pressure reducing valve, a feed pressure adjusting valve and a feed flow rate adjusting valve provided in order from the pump side to the feed motor side in the operating pipeline of the feeding mechanism, and the feed. The feed flow rate adjusting valve includes a secondary passage between the flow rate adjusting valve and the feed motor, a pilot port of the impact pressure controlling means, and a pilot passage connecting the pilot port of the damper pressure controlling means to each other. It is characterized in that the primary passage between the feed pressure adjusting valve and the feed pressure adjusting valve and the pushing piston working pipeline are directly connected to each other.

According to the hydraulic striking mechanism according to any one aspect of the present invention, the striking pressure control means is provided in the working line of the hydraulic striking mechanism, and the damper pressure controlling means is provided in the working line of the dual damper mechanism. The pilot port of the striking pressure control means is provided with the downstream pressure of the feed flow rate adjusting valve in the working line of the feed mechanism, that is, the secondary pressure of the feed mechanism is supplied, and the pilot port of the damper pressure control means is provided with the feed flow rate adjustment. The pressure between the valve and the feed pressure regulating valve, i.e. the primary pressure of the feed mechanism, is supplied.
Therefore, the hydraulic striking mechanism operates with the striking pressure fluctuating according to the state of the crushing target, and the dual damper mechanism operates with a constant damper pressure corresponding to the set pressure of the feed mechanism. At the time of drilling, both the dual damper mechanism and the hydraulic striking mechanism maintain a predetermined operating state, and when the tip of the tool rushes into a gap or a crush zone, the pushing action of the dual damper mechanism is properly exerted and the liquid is exhibited. Since the striking pressure of the pressure type striking mechanism is reduced, the blank striking state is greatly improved.

As described above, according to the present invention, when the dual damper mechanism is applied to the hydraulic pressure type striking mechanism of the front / rear chamber high / low pressure switching type, a drilling control device that appropriately exerts the damper action and improves the blank shot state is provided. Can be provided.

It is explanatory drawing of 1st Embodiment of the drilling control apparatus which concerns on one aspect of this invention. It is a control example brought about by the drilling control apparatus of FIG. It is explanatory drawing of the 2nd Embodiment of the drilling control apparatus which concerns on one aspect of this invention. It is a schematic diagram of the drilling apparatus provided with the conventional damper pressure control means. It is explanatory drawing of the conventional dual damper mechanism. It is explanatory drawing of the conventional damper pressure control means. It is a control diagram of the conventional damper pressure control means.

Hereinafter, embodiments of the present invention will be described with reference to the drawings as appropriate. However, since each configuration of the entire drilling device is common to the above-mentioned conventional configurations (FIGS. 4 to 7), detailed description thereof will be omitted. The drawings are schematic. Therefore, it should be noted that the relationship, ratio, etc. between the thickness and the plane dimension are different from the actual ones, and there are parts where the relationship and ratio of the dimensions are different between the drawings. Further, the embodiments shown below exemplify devices and methods for embodying the technical idea of the present invention, and the technical idea of the present invention describes the material, shape, structure, and arrangement of components. Etc. are not specified in the following embodiments.

[First Embodiment]
First, the drilling control device 100 according to the first embodiment of the present invention will be described with reference to FIG.
As shown in the figure, the drilling control device 100 of the first embodiment includes a drifter (hydraulic striking mechanism) 101, a dual damper mechanism 104, a striking pressure control means 108, a damper pressure control means 112, a rotation mechanism 115, and a feed. It is equipped with a mechanism 116. The dual damper mechanism 104 has a pushing piston 105 and a damping piston 106.

The drifter 101 has a striking piston 102 and a switching valve 103, and is provided with a known front-rear chamber high-low pressure switching type operating mechanism. A shank rod 125 is attached to the front of the striking piston 102 (upper in the figure), a rod (not shown) is connected to the shank rod 125, and a tool (not shown) is attached to the tip of the rod.
The drifter 101 and the pump P are connected to each other via a striking operation line 107, and the striking pressure control means 108 is provided in the striking operation line 107. The striking pressure control means 108 includes a pilot proportional control valve 109 and a pressure reducing valve 110.

A pilot passage 127, which will be described later, is connected to the pilot port 109a of the pilot proportional control valve 109, and the pilot port 110a of the pressure reducing valve 110 is connected to the input side of the pilot proportional control valve 109. The input side of the pressure reducing valve 110 is connected to the upstream side of the striking operation line 107, and the discharge side is connected to the downstream side of the striking operation line 107.
The dual damper mechanism 104 and the pump P are connected to each other via a damper operating pipeline 111, and a damper pressure control means 112 is provided in the damper operating pipeline 111. The damper pressure control means 112 includes a pilot proportional control valve 113 and a pressure reducing valve 114.

A pilot passage 126, which will be described later, is connected to the pilot port 113a of the pilot proportional control valve 113, and the pilot port 114a of the pressure reducing valve 114 is connected to the input side of the pilot proportional control valve 113. The input side of the pressure reducing valve 114 is connected to the upstream side of the damper operating pipeline 111, and the discharge side is connected to the downstream side of the damper operating pipeline 111.
The pilot ports 113a and 114a are provided with adjusting mechanisms 113b and 114b, respectively. The adjusting mechanism 113b sets the initial value of the damper pressure DPpr in FIG. 7, that is, the damper pressure when the feed pressure FFpr is zero, and the adjusting mechanism 114b sets the upper limit value of the damper pressure DPpr.

The feed mechanism 116 includes a feed motor 117, a feed pressure regulating valve 118, a feed flow rate regulating valve 121, and a feed operating line 122. In the feed actuating pipeline 122, the right side in the figure is the forward side 122a and the left side is the backward side 122b.
A feed pressure adjusting valve 118 and a feed flow rate adjusting valve 121 are provided in this order from the pump P side toward the feed motor 117 side on the forward side 122a of the feed operating pipeline 122. The feed pressure control valve 118 includes a relief valve 119 and a pressure reducing valve 120.

Here, on the forward side 122a of the feed actuating pipeline 122, the section between the feed pressure adjusting valve 118 and the feed flow rate adjusting valve 121 is called the primary pressure passage 123, and the feed flow rate adjusting valve 121 and the feed motor 117 The section between them is called a secondary pressure passage 124.
The primary pressure passage 123 and the pilot port 113a of the damper pressure control means 113 are interconnected by a pilot passage 126, and the secondary pressure passage 124 and the pilot port 109a of the striking pressure control means 108 are connected to each other by the pilot passage 127. Are interconnected by.

Next, the control characteristics of the drilling control device 100 of the first embodiment will be described with reference to FIG. The horizontal axis of FIG. 2 shows that the state of the crushing target changes from the hard rock H1 to the soft rock S to the hard rock H2 to the void G to the hard rock H3 as the drilling progresses, and the vertical axis shows the crushing target. Impact pressure (MPa), actual feed pressure (MPa), damper operating pressure (MPa), impact point displacement (mm), feed rate (m / min × 10 ^-1 ), and tool stress (MPa) corresponding to the state change of %) Shows fluctuations.

In the configuration shown in FIG. 1, when the state of the crushing target changes, the actual feed pressure, that is, the pressure of the secondary pressure passage 124 changes. On the other hand, the pressure of the primary pressure passage 123 is maintained at the pressure set by the feed pressure adjusting valve 118 without being affected by the state change of the crushing target.
Therefore, the operating pressure of the drifter 101 fluctuates as the state of the crushed object changes due to the proportional control of the striking pressure control means 108 to which the pilot pressure is supplied from the secondary pressure passage 124. On the other hand, the damper operating pressure of the dual damper mechanism 104 is controlled by the damper pressure control means 113 to which the pilot pressure is supplied from the primary pressure passage 123, and is always constant.

When the object to be crushed is soft rock S, the actual feed pressure decreases, and the striking pressure also decreases accordingly to reduce the striking force. Since the damper operating pressure is constant, the thrust of the pushing piston 105 does not decrease and the shank rod 125 Stablely press forward. Therefore, the blank shot condition is alleviated and the increase in tool stress is suppressed to a low level.
When the object to be crushed is the void G, the actual feed pressure drops significantly, the striking pressure also drops accordingly, the striking force is greatly reduced, and the damper operating pressure is constant, so the thrust of the pushing piston 105 decreases. Stablely press the shank rod 125 forward. Therefore, the blank shot condition is alleviated and the increase in tool stress is suppressed to a low level.
Here, when the tool stress in the void G and the soft rock S is compared, the tool stress is higher in the void G, but in the void G, the tip of the tool is targeted for crushing even if the pushing piston 105 operates properly. This is because there is a limit to the close contact.

[Second Embodiment]
Next, the drilling control device 200 according to the second embodiment of the present invention will be described with reference to FIG. It should be noted that the differences from the first embodiment will be described, and in the figure, the same components as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted as appropriate.
The difference between the drilling control device 200 of the second embodiment and the drilling control device 100 of the first embodiment is that, as shown in the figure, the working line of the dual damper 104 is different from the pushing piston working line 128. Separated from the damping piston operating pipeline 129, the pushing piston operating pipeline 128 is connected to the primary pressure passage 123, the damping piston operating pipeline 129 is connected to the pump P, and a damper pressure control means 112 is provided in the middle thereof. It is a point.

In the drilling control device 200 of the second embodiment, the pilot port 109a of the striking pressure control means 108, the pilot port 113a of the damper pressure control means 112, and the secondary pressure passage 124 are connected by the pilot passage 127'. ..
That is, the pushing piston 105 is operated by the primary pressure of the feed mechanism 116, and the damping piston 106 is operated in proportion to the secondary pressure of the feed mechanism 116. As a result, the pushing action is constant regardless of the state of the crushing target as in the first embodiment, and the damping action can be optimally controlled according to the state of the crushing target.
It should be noted that the perforation control device according to the present invention is not limited to the above embodiment, and of course, various modifications can be made without departing from the gist of the present invention.

100, 200 Drilling control device 101 Drifter (hydraulic impact mechanism)
102 Impact piston 103 Switching valve 104 Dual damper mechanism 105 Pushing piston 106 Damping piston 107 Impact operating pipeline 108 Impact pressure control means 109 Pilot proportional control valve 109a Pilot port 110 Pressure reducing valve 110a Piping port 111 Damper operating pipeline 112 Damper pressure control means 113 Piston proportional control valve 113a Piston port 113b Adjustment mechanism 114 Pressure reducing valve 114a Piston port 114b Adjustment mechanism 115 Rotation mechanism 116 Feed mechanism 117 Feed motor 118 Feed pressure adjustment valve 119 Relief valve 120 Pressure reducing valve 121 Feed flow rate adjustment valve 122 Feed operation pipeline 122a Forward side 122b Reverse side 123 Primary pressure passage 124 Secondary pressure passage 125 Shank rod 126 Piping passage 127, 127 ′ Piping passage 128 Pushing piston operating pipeline 129 Damping piston operating pipeline P Pump T Tank

Claims (2)

A drilling control device used in a drilling device including a front / rear chamber high / low pressure switching hydraulic impact mechanism, a feed mechanism having a feed motor, and a dual damper mechanism having a pushing piston and a damping piston.
A striking pressure control means provided in the working line of the hydraulic striking mechanism and having a first pilot proportional control valve and a first pressure reducing valve.
A damper pressure control means provided in the working line of the dual damper mechanism and having a second pilot proportional control valve and a second pressure reducing valve.
A feed pressure adjusting valve and a feed flow rate adjusting valve provided in order from the pump side to the feed motor side in the operating pipeline of the feed mechanism,
A first pilot passage that interconnects the pilot port of the damper pressure control means and the primary passage between the feed flow rate regulating valve and the feed pressure regulating valve.
A second pilot passage that interconnects the pilot port of the impact pressure control means and the secondary passage between the feed flow rate adjusting valve and the feed motor.
A perforation control device comprising. A front / rear chamber high / low pressure switching hydraulic impact mechanism, a feed mechanism having a feed motor, and a dual damper mechanism having a pushing piston and a damping piston are provided, and the operating pipeline of the dual damper mechanism operates for a damping piston. A drilling control device used for a drilling device having a pipeline and a working pipeline for a pushing piston.
A striking pressure control means provided in the working line of the hydraulic striking mechanism and having a first pilot proportional control valve and a first pressure reducing valve.
A damper pressure control means provided in the damping piston working pipeline and having a second pilot proportional control valve and a second pressure reducing valve.
A feed pressure adjusting valve and a feed flow rate adjusting valve provided in order from the pump side to the feed motor side in the operating pipeline of the feed mechanism,
A secondary passage between the feed flow rate adjusting valve and the feed motor, a pilot port of the impact pressure control means, and a pilot passage for interconnecting the pilot port of the damper pressure control means are provided.
A drilling control device comprising a direct connection between a primary passage between the feed flow rate adjusting valve and the feed pressure adjusting valve and an operating pipeline for a pushing piston.

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