JP6571489B2 - Hydraulic down-the-hole drill accumulator device - Google Patents

Description

  The present invention relates to a hydraulic down-the-hole drill, and more particularly to an accumulator device for a hydraulic down-the-hole drill.

The impact mechanism of a blast hole drill that is driven by hydraulic pressure has accumulators in the high-pressure circuit and the low-pressure circuit, respectively. In the case of a hydraulic drifter, the accumulator is mounted on the outer peripheral surface of a cylinder in which components such as a striking piston and a switching valve are slidably fitted.
On the other hand, in the case of a hydraulic down-the-hole drill, the striking mechanism is disposed in the casing pipe immediately after the tip bit. Therefore, the accumulator is inevitably provided in the casing pipe. In the present specification, the left side in the axial direction in the figure is the advancing direction of drilling, the left side is the front or front side, and the right side is the rear or rear side.

As a high and low pressure accumulator of a conventional hydraulic down-the-hole drill, for example, a high pressure accumulator shown in FIG. 7 and a low pressure accumulator shown in FIG. 8 have been proposed (see, for example, Patent Document 1).
These accumulators have a multi-pipe structure in the pipe body 110 and form a high-pressure passage 170 (or a low-pressure passage 160) and an annular space concentric with the high-pressure passage 170, and the annular space is formed by a diaphragm 180 with a gas chamber 190 and an oil chamber 200. A plurality of distance rings 300 in which oil holes 230 are formed in the separation pipe 140 between the oil chamber 200 and the high-pressure passage 170 and unevenness is formed on the joint surface are formed in the oil chamber 200 of the separation pipe 140. Each joint surface is continuously provided on the side so as to face the oil hole 230.

  Here, the two high and low pressure accumulators are arranged so that the high pressure accumulator and the low pressure accumulator are connected in order from the front behind the striking mechanism (not shown). In the conventional hydraulic down-the-hole drill accumulator, the high-pressure passage 170, the low-pressure passage 160, and the flushing passage 150 are arranged in the radial direction in the tube 110 such that the center is the high-pressure passage 170, the outside is the low-pressure passage 160, and the outermost The outside is a flushing passage 150. In the figure, the image of high-pressure oil is indicated by large dots, and the image of low-pressure oil is indicated by small dots (the same applies hereinafter).

JP-A-6-341403

By the way, the main components for exerting the accumulator action are an oil chamber, a gas chamber, and a diaphragm that isolates both chambers. In the case of a hydraulic drifter, the high pressure accumulator is adjusted by adjusting the sealing pressure of the gas chamber. Differentiating the setting of the low-pressure accumulator.
On the other hand, in the accumulator of the conventional hydraulic down-the-hole drill, due to the positional relationship between the high pressure passage 170 and the low pressure passage 160 described above, in the high pressure accumulator, the oil chamber 200 is disposed on the center side and the gas chamber 190 is disposed on the outside. Then, the gas chamber 190 is disposed at the center, and the oil chamber 200 is disposed outside.

Therefore, in the conventional structure, in the high-pressure accumulator and the low-pressure accumulator, the arrangement of the main constituent members is reversed by the inner and outer diameters. As a result, all the main constituent members and the peripheral constituent members are replaced with the high-pressure accumulator and the low-pressure accumulator. There is a problem that it is necessary to prepare separately.
Therefore, in the conventional hydraulic down-the-hole drill accumulator, since the number of components increases, it is necessary to pay close attention so that the cost increases, the parts management becomes complicated, and the parts are not mistakenly assembled.

Further, the diaphragm 180 exhibits a reverse behavior in accumulating between the high pressure accumulator and the low pressure accumulator, and there is a problem that a difference occurs in the function as the accumulator.
Therefore, the present invention has been made paying attention to such problems, and has been reviewed for a structure using a high-pressure accumulator and a low-pressure accumulator, and provides an accumulator device for a hydraulic down-the-hole drill that can be stably operated at low cost. Let it be an issue.

In order to solve the above problems, an accumulator device for a hydraulic down-the-hole drill according to an aspect of the present invention includes a hollow cylindrical outer case and three tubular members disposed concentrically in the outer case. An accumulator unit having an inner pipe, a screen member and a pressure vessel member arranged in order from the center side to the outer peripheral side of the outer case, and a diaphragm arranged between the screen member and the pressure vessel member Each accumulator unit is provided in an annular gap formed between the flushing fluid passage provided in the inner diameter space of the inner pipe and the outer peripheral surface of the inner pipe and the inner peripheral surface of the screen member. A pressure accumulating fluid passage, a pressure accumulating portion provided at an interface between the screen member and the diaphragm, and the diaphragm A gas chamber provided in a closed space formed between the ram and the inner peripheral surface of the pressure vessel member, and an annular shape formed between the outer peripheral surface of the pressure vessel member and the inner peripheral surface of the outer case A non-accumulated fluid passage provided in the gap, and as the plurality of accumulator units, a high-pressure accumulator unit adjusted to accumulate high-pressure oil and a low-pressure accumulator unit adjusted to accumulate low-pressure oil are connected in the front-rear direction. A first communication passage communicating the non-accumulated fluid passage of the high-pressure accumulator unit and the accumulator fluid passage of the low-pressure accumulator unit between the high-pressure accumulator unit and the low-pressure accumulator unit , through communication between the accumulator fluid passage of the high-pressure accumulator unit and the non-accumulator fluid passage of the low-pressure accumulator unit Characterized in that it comprises a connecting member having a second communicating path.

According to the accumulator device for a hydraulic down-the-hole drill according to one aspect of the present invention, the high-pressure accumulator unit and the low-pressure accumulator unit arranged in the front and rear are in common, so the cost is low.
In addition, the high pressure accumulator unit and the low pressure accumulator unit press the diaphragm of the pressure accumulation fluid passage disposed on the central axis side toward the outer diameter side to press the gas in the gas chamber. Since the behavior at the time of accumulating is compressed and accumulated, the function as an accumulator is stabilized.

  As described above, according to the present invention, it is possible to provide an accumulator device for a hydraulic down-the-hole drill in which the structure is common between the high-pressure accumulator unit and the low-pressure accumulator unit, and the operation is stable at low cost.

It is explanatory drawing of one Embodiment of the hydraulic down the hole drill which concerns on 1 aspect of this invention. It is sectional drawing along the axis which shows one Embodiment of the accumulator apparatus of the hydraulic down-the-hole drill which concerns on 1 aspect of this invention. FIG. 3 is a longitudinal sectional view of a portion of the high pressure accumulator unit in FIG. 2. FIG. 4 is a detailed explanatory diagram of a part A in FIG. 3. FIG. 4 is a sectional view taken along line BB in FIG. 3. It is CC sectional view taken on the line of FIG. It is a longitudinal cross-sectional view which shows an example of the high pressure accumulator of the conventional hydraulic down the hole drill. It is a longitudinal cross-sectional view which shows an example of the low pressure accumulator of the conventional hydraulic down-the-hole drill.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings as appropriate. The drawings are schematic. For this reason, it should be noted that the relationship between the thickness and the planar dimension, the ratio, and the like are different from the actual ones, and the dimensional relationship and the ratio are different between the drawings.
In particular, in the present invention, the arrangement of the pipes of the multiple pipe structure is important. Therefore, the scale of the original drawing is changed and deformed, and the hatching of the cross section is omitted as appropriate in order to prioritize the visibility of the pipes. Further, the following embodiments exemplify apparatuses and methods for embodying the technical idea of the present invention, and the technical idea of the present invention is the material, shape, structure, and arrangement of components. Etc. are not specified in the following embodiments.

In the hydraulic down-the-hole drill of this embodiment, as shown in FIG. 1, the bit 100, the striking mechanism 90, the accumulator device 1, the joint rod 80, the swivel mechanism 70, and the rotation mechanism 60 are sequentially connected from the front end side to the rear. Has been configured.
This hydraulic down-the-hole drill supplies pressure oil to a striking mechanism 90 from a hydraulic source (not shown) via a swivel mechanism 70, and strikes the bit 100 by driving the striking mechanism 90. By transmitting the rotational force to the bit 100 via the accumulator device 1 and the striking mechanism 90, the desired drilling is performed.

The accumulator device 1 has a configuration in which a high-pressure accumulator unit 10 and a low-pressure accumulator unit 50 are adjacent in the front-rear direction, as shown in a longitudinal sectional view in FIG. The components of the high-pressure accumulator unit 10 and the low-pressure accumulator unit 50 of this embodiment are common to both. The difference between the two is only changing the pressure setting of nitrogen gas charged in a gas chamber 30 described later. Therefore, in the present specification, components will be described below with reference to the drawings, taking the high-pressure accumulator unit 10 as an example.
As shown in FIG. 3, the high-pressure accumulator unit 10 includes a hollow cylindrical outer case 21, an inner pipe 11, a screen member S, and a pressure vessel concentrically from the center toward the outer periphery in the outer case 21. Three tubular members made of member R are disposed.

The screen member S is configured by engaging a plurality of distance rings 12 with a front support ring 13 and a rear support ring 14 provided on the front and rear sides thereof. The pressure vessel member R includes an inner case 18, a front side adapting ring 19, and a rear side adapting ring 20. A diaphragm 15 is provided between the screen member S and the pressure vessel member R.
The inner pipe 11 is a substantially straight tubular member, the front end side is supported by the front cap 16, and the rear end side is supported by the joint 22. The inner diameter space of the inner pipe 11 (the space of the axial center portion of the accumulator 10) serves as a flushing fluid passage 26. An annular gap formed between the outer peripheral surface of the inner pipe 11 and the inner peripheral surface of the screen member S is a pressure accumulation fluid passage, that is, a pressure accumulation fluid passage 27.

  As shown in FIG. 4, each distance ring 12 is a ring-shaped member in which an annular front engagement portion 12d protrudes in front of the large diameter portion 12a. A large-diameter front end surface 12b and a large-diameter rear end surface 12c are formed on the front and rear sides of the large-diameter portion 12a, respectively, and a large R chamfer is provided at the corner of the large-diameter rear end surface 12c. A rear engagement portion 12f and a recess 12i are formed in the inner peripheral portion behind the large diameter portion 12a. An engagement portion front end face 12e is formed at the front end of the front engagement portion 12d, and an engagement portion rear end face 12g is formed at the rear engagement portion 12f. 12 d of oil holes are provided in the front side engaging part 12d equally spaced apart in the circumferential direction (refer FIG. 5).

As shown in FIG. 4, the plurality of distance rings 12 are connected to each other by the engagement of the front engagement portion 12 d and the rear engagement portion 12 f, and the large diameter front end surface 12 b and the large diameter portion rear An annular oil passage 12j is formed by the end face 12c and the recess 12i, and a slit 12k is formed continuously to the annular oil passage 12j. These oil holes 12h to the annular oil passage 12i to the slit 12k form a passage for pressure accumulation fluid, that is, high-pressure oil.
The rear portion of the front support ring 13 has the same configuration as the rear portion of the distance ring 12, and the front portion of the rear support ring 14 has the same configuration as the front portion of the distance ring 12. Thereby, as shown in FIG. 3, the front support ring 13, the distance ring 12, and the rear support ring 14 are connected to each other to form a screen member S. The rear support ring 14 is provided with an air supply / exhaust passage 14 a for supplying and exhausting gas to and from the gas chamber 30.

The inner case 18 is formed with a concave portion 18a having a trapezoidal shape in FIG. 3 on the inner peripheral surface of the central portion thereof, and a front-side adapter having an inclined surface substantially continuous with the hypotenuse of the trapezoid before and after the concave portion 18a. A ring 19 and a rear adapting ring 20 are provided. The rear adapting ring 14 is provided with an air supply / exhaust passage 20 a for supplying and exhausting gas to and from the gas chamber 30.
The front support ring 13 and the front adapting ring 19, and the rear support ring 14 and the rear adapting ring 20 respectively hold the front and rear ends of the diaphragm 15, and the diaphragm 15 and the inner peripheral surface of the pressure vessel member R A gas chamber 30 is formed in a closed space formed between them (closed space formed by the inner case recess 18 a), whereby the interface between the diaphragm 15 and the screen member S serves as a pressure accumulating portion 29.

As shown in FIG. 3, the front cap 16 and the rear cap 17 are screwed on the front and rear of the inner case 18, whereby the constituent members of the screen member S and the constituent members of the pressure vessel member R are integrated. It is assembled. The high-pressure accumulator unit 10 is configured by holding the large-diameter portion of the front cap 16 and the large-diameter portion of the rear cap 17 in contact with the inner diameter of the outer case 21.
The large diameter portion of the front cap 16 is provided with a plurality of communication grooves 16a, and an inclined passage 16b is provided therein. A plurality of communication grooves 17a are provided in the large-diameter portion of the rear cap 17, and a charge valve 24 and a plug 25 (FIG. 6) for supplying and discharging gas to and from the gas chamber 30 are provided in the rear cap 17. And intake and exhaust holes 17b are provided. The gap between the inner peripheral surface of the outer case 21 and the communication grooves 16a and 17a and the annular gap formed between the inner peripheral surface of the outer case 21 and the outer peripheral surface of the inner case 18 are low pressure oil passages, that is, non-accumulated pressure. A fluid passage 28 is formed.

The configuration of the low-pressure accumulator unit 50 is basically the same as the configuration of the high-pressure accumulator unit 10 described above. However, in the case of the low-pressure accumulator unit 50, instead of the front cap 16, the joint 22 is screwed as shown in FIG.
The joint 22 includes two screw portions that connect the outer cases 21 of the high-pressure accumulator unit 10 and the low-pressure accumulator unit 50 to each other, whereby the high-pressure accumulator unit 10 and the low-pressure accumulator unit 50 are connected. That is, the joint 22 constitutes the “connecting member” shown in “Means for Solving the Problems”.

2 and 3, the inner peripheral surface of the cap 17 and the inner peripheral surface of the joint 22 are connected to each other by an outer pipe 23, and the pressure accumulation fluid passage 27 and the non-accumulation fluid passage 28 are connected to each other. It is separated.
As shown in FIG. 2, the joint 22 includes a first communication path 22 a that communicates the non-accumulated fluid path 28 of the high-pressure accumulator unit 10 and the pressure-accumulated fluid path 51 of the low-pressure accumulator unit 50, and the high-pressure accumulator unit 10. The pressure accumulation fluid passage 27 and the non-accumulation fluid passage 52 of the low pressure accumulator unit 50 are provided with a second communication passage 22b. As a result, low-pressure oil flows through the pressure accumulation fluid passage 51, and high-pressure oil flows through the non-pressure accumulation fluid passage 52.

Next, operation | movement of the accumulator apparatus 1 of the hydraulic down-the-hole drill of this embodiment, and an effect are demonstrated.
When the drilling operation is performed by driving the hydraulic down-the-hole drill of this embodiment, compressed air from an external compressor is supplied to the central flushing fluid passage 26 and discharged from the bit 100 at the tip, and from the external hydraulic pump. After the high-pressure oil is supplied to the pressure accumulation fluid passage 27 and drives the striking mechanism 90, the high-pressure oil is returned to the external tank through the low-pressure oil passage 28.
When pressure oil pulsation occurs in the striking mechanism 90, the accumulator device 1 accumulates the pressure. When a pressure increase due to pulsation occurs in the pressure accumulation fluid passage 27 in the high pressure accumulator unit 10, the pressure oil is transmitted to the pressure accumulation portion 29 via the oil holes 12 h, the annular oil passage 12 i, and the slit 12 k, and presses the diaphragm 15. When the diaphragm 15 is pressed and deformed, the nitrogen gas in the gas chamber 30 is compressed, and the pressure oil pulsation is accumulated in the accumulator 29. The accumulated pressure oil is discharged and used for the operation of the striking mechanism 90.

In the low pressure accumulator unit 50, since the low pressure oil flows through the pressure accumulation fluid passage 51, the pulsation of the low pressure oil is accumulated in the pressure accumulation section. At this time, the pressure oil in the pressure accumulating fluid passage disposed on the central axis side presses the diaphragm disposed on the outer diameter side toward the outer diameter side, whereby the gas in the gas chamber is compressed and accumulated. The behavior during pressure accumulation itself is the same as that of the high-pressure accumulator unit 10.
That is, according to this accumulator device 1, since the configuration contents of the high-pressure accumulator unit 10 and the low-pressure accumulator unit 50 arranged in the front and rear are common, the cost is low. Further, the high pressure accumulator unit 10 and the low pressure accumulator unit 50 cause the pressure oil in the pressure accumulation fluid passage 51 disposed on the central axis side to press the diaphragm 15 disposed on the outer diameter side toward the outer diameter side to generate gas. Since the behavior at the time of pressure accumulation in which the gas in the chamber 30 is compressed and accumulated is common, the function as an accumulator is stabilized.

As mentioned above, although one Embodiment of this invention was described referring drawings, the accumulator apparatus of the hydraulic down the hole drill which concerns on this invention is not limited to the said embodiment, Unless it deviates from the main point of this invention Of course, it is allowed to change various other modifications and components.
For example, in the above-described embodiment, the example in which the pressure vessel member is configured by the inner case, the front side adapting ring, and the rear side adapting ring has been described.

DESCRIPTION OF SYMBOLS 1 Accumulator apparatus 10 High pressure accumulator unit 11 Inner pipe 12 Distance ring 12a Large diameter part 12b Large diameter part front end surface 12c Large diameter part rear end surface 12d Front side engagement part 12e Engagement part front end surface 12f Rear side engagement part 12g Engagement part Rear end face 12h Oil hole 12i Recess 12j Annular oil passage 12k Slit 13 Front support ring 14 Rear support ring 14a Supply / exhaust passage 15 Diaphragm 16 Front cap 16a Communication groove 16b Inclined passage (high pressure)
17 Rear cap 17a Communication groove 17b Air supply / exhaust hole 18 Inner case 18a Recess 19 Front adapt ring 20 Rear adapt ring 20a Supply / exhaust passage 21 Outer case 22 Joint (connecting member)
22a First communication path 22b Second communication path 23 Outer pipe 24 Charge valve 25 Plug 26 Flushing fluid path 27 Accumulated fluid path (high pressure oil path)
28 Non-accumulated fluid passage (low pressure oil passage)
29 accumulator 30 gas chamber 50 low pressure accumulator unit 51 accumulator fluid passage (low pressure oil passage)
52 Non-accumulated fluid passage (high pressure oil passage)
S Screen member R Pressure vessel member

Claims (1)

A hollow cylindrical outer case, and three tubular members disposed concentrically in the outer case, an inner pipe disposed in order from the center side to the outer peripheral side of the outer case, a screen member, and A plurality of accumulator units having a pressure vessel member and a diaphragm disposed between the screen member and the pressure vessel member;
Each accumulator unit includes a flushing fluid passage provided in an inner diameter space of the inner pipe, and a pressure accumulation fluid passage provided in an annular gap formed between the outer peripheral surface of the inner pipe and the inner peripheral surface of the screen member. A pressure accumulating portion provided at an interface between the screen member and the diaphragm, a gas chamber provided in a closed space formed between the diaphragm and an inner peripheral surface of the pressure vessel member, and the pressure vessel member A non-accumulated fluid passage provided in an annular gap formed between the outer peripheral surface of the outer case and the inner peripheral surface of the outer case,
As the plurality of accumulator units, a high-pressure accumulator unit adjusted to store high-pressure oil and a low-pressure accumulator unit adjusted to store low-pressure oil are arranged to be connected back and forth,
Between the low pressure accumulator unit and the high pressure accumulator unit, a first communicating path which communicates the accumulator fluid passage of the non-accumulator fluid passage and said low pressure accumulator unit of the high-pressure accumulator unit, accumulator fluid passage of the high-pressure accumulator unit An accumulator device for a hydraulic down-the-hole drill comprising: a connecting member having a second communication path that communicates with a non-accumulated fluid path of the low-pressure accumulator unit .

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