CN216111510U - Control valve structure of top drive type rock drill - Google Patents

Abstract

The utility model provides a control valve structure of a top drive rock drill, which comprises a valve body, wherein an oil inlet, an oil return port and a valve cavity are arranged in the valve body, a large valve core is arranged in the valve cavity in a sliding manner, the outer wall of the large valve core is arranged in a sealing manner with the inner wall of the valve cavity, a first oil port is also arranged on the valve body, and when the large valve core moves to the left position, the first oil port is communicated with the oil inlet; when the big valve core moves to the right position, the first oil port is communicated with the oil return port. The direction of an oil path is controlled by controlling the position switching of the large valve core between the left position and the right position in the valve cavity, meanwhile, the space of the valve body is reduced by adopting a structure of returning oil in the middle of the large valve core, and the differential design of the large valve core and the small valve core ensures that the reversing oil consumption is low and the response time is short.

Description

Control valve structure of top drive type rock drill

Technical Field

The utility model relates to the field of rock drills, in particular to a control valve structure of a top drive type rock drill.

Background

The rock drill is a tool for directly mining stone, when it is worked, the impact piston can make high-frequency reciprocating motion, and can continuously impact drill shank, and under the action of impact force the wedge-shaped drill bit can be used for crushing rock and drilling it into a certain depth so as to form a dent. After the piston is withdrawn, the drill rod rotates a certain angle, the piston moves forwards, and a new dent is formed when the piston impacts the drill rod end again. The segmental rock mass between the two indents is sheared by the horizontal force component generated on the bit. The piston continuously impacts the drill bit shank and continuously inputs compressed air or pressure water from the central hole of the drill bit to discharge rock slag out of the hole, namely, a circular drill hole with a certain depth is formed.

The impact piston does high-speed reciprocating motion in the impact cylinder generally by controlling oil inlet and oil return of an inner cavity of the impact cylinder by a control valve, but the control valve in the prior art has the disadvantages of complex structure, high manufacturing cost, large occupied space, long reversing response time and high oil consumption.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problems that in the prior art, a control valve of a rock drill impact cylinder is complex in structure, high in manufacturing cost, large in occupied space, long in reversing response time and high in oil consumption.

The technical scheme adopted by the utility model for solving the technical problems is as follows: a control valve structure of a top drive rock drill comprises a valve body, wherein an oil inlet, an oil return port and a valve cavity are arranged in the valve body, a large valve core is arranged in the valve cavity in a sliding mode, the outer wall of the large valve core is arranged in a sealing mode with the inner wall of the valve cavity, a first oil port is further arranged on the valve body, and when the large valve core moves to the left position, the first oil port is communicated with the oil inlet; when the big valve core moves to the right position, the first oil port is communicated with the oil return port.

Further: a valve core limiting block is installed on the left side of the valve cavity, a valve seat is installed on the right side of the valve cavity, a first valve hole which is opened leftwards along the axial direction is formed in the valve seat, a small valve core is movably installed in the first valve hole, the outer wall of the small valve core is arranged in a sealing mode with the hole wall of the first valve hole, a right pressure cavity is formed in the first valve hole and located on the right side of the small valve core, a first oil duct is arranged on the valve seat, and the oil inlet is communicated with the right pressure cavity through a first oil duct; the right part of the big valve core is provided with an outward convex pressure step, the right part of the valve cavity is provided with an installation groove matched with the pressure step, the diameter size of the installation groove is larger than that of the valve cavity, the outer wall of the pressure step is hermetically arranged with the groove bottom of the installation groove, the pressure step can slide left and right along the installation groove, a left pressure cavity is formed between the left pressure surface of the pressure step and the valve cavity, a third oil cavity is formed between the right end surface of the pressure step and the valve seat, and the third oil cavity is communicated with the oil return port; when the pressure in the right pressure cavity is higher than the pressure in the left pressure cavity, the small valve core pushes the large valve core to move left synchronously; when the pressure in the left pressure cavity is larger than the pressure in the right pressure cavity, the big valve core pushes the small valve core to move right synchronously.

Further: the inner wall of the valve cavity is sequentially provided with a first concave oil groove, a second concave oil groove, a third concave oil groove, a fourth concave oil groove and a fifth concave oil groove from left to right, the first oil groove is connected with the first oil port, the second oil groove is communicated with the oil inlet, the fourth oil groove is communicated with the left pressure cavity, the fourth oil groove is connected with a fourth oil port, the fourth oil port is communicated with the third oil groove through a first connecting hole, and the fifth oil groove is arranged in the third oil cavity and is connected with a fifth oil port; the middle part of the outer wall of the big valve core is provided with an inwards concave connecting groove, a second valve hole which is opened leftwards along the axial direction is arranged in the big valve core, and a second connecting hole which is communicated with the second valve hole is also formed in the right end face of the big valve core; when the big valve core moves to the left position, the second oil groove is communicated with the first oil groove through a connecting groove; when the big valve core moves to the right position, the first oil groove is communicated with the second valve hole through the valve cavity, and the second oil groove is communicated with the third oil groove through the connecting groove.

The control valve structure of the top drive rock drill has the advantages that the direction of an oil path is controlled by controlling the switching position of the large valve core between the left position and the right position in the valve cavity, meanwhile, the space of the valve body is reduced by adopting the structure of oil return in the middle of the large valve core, and the differential design of the large valve core and the small valve core ensures low reversing oil consumption and short response time.

Drawings

The utility model is further illustrated with reference to the following figures and examples.

Fig. 1 is a schematic structural view of a control valve structure of a top drive rock drill according to the present invention;

FIG. 2 is a schematic structural view of a valve body;

FIG. 3 is a schematic structural view of a large valve core and a small valve core;

FIG. 4 is a schematic view of the oil path when the big spool is at the left position;

fig. 5 is an oil flow diagram when the large spool is in the right position.

In the figure, 1, an oil inlet, 2, an oil return port, 3, a valve cavity, 4, a large valve core, 5, a first oil port, 6, a valve core limiting block, 7, a valve seat, 8, a first valve hole, 9, a small valve core, 10, a right pressure cavity, 11, a first oil channel, 12, a pressure step, 13, a mounting groove, 14, a left pressure cavity, 15, a third oil cavity, 20, a first oil groove, 21, a second oil groove, 22, a third oil groove, 23, a fourth oil groove, 24, a fifth oil groove, 25, a fourth oil port, 26, a first connecting hole, 27, a fifth oil port, a valve hole, 28, a connecting groove, 29, a second oil port, 30 and a second connecting hole are formed.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention. On the contrary, the embodiments of the utility model include all changes, modifications and equivalents coming within the spirit and terms of the claims appended hereto.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the present invention.

Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.

As shown in fig. 1, the utility model provides a control valve structure of a top drive rock drill, which comprises a valve body, wherein an oil inlet 1, an oil return port 2 and a valve cavity 3 are arranged in the valve body, a large valve core 4 is slidably arranged in the valve cavity 3, the outer wall of the large valve core 4 is hermetically arranged with the inner wall of the valve cavity 3, a first oil port 5 is also arranged on the valve body, and when the large valve core 4 moves to the left position, the first oil port 5 is communicated with the oil inlet 1; when the big valve core 4 moves to the right position, the first oil port 5 is communicated with the oil return port 2.

In the working process, the first oil port 5 is connected with the oil port of the impact cylinder body, the trend of an oil path is controlled by controlling the large valve element 4 to move between a left position and a right position in the valve cavity 3, when the large valve element 4 moves to the left position, the oil inlet 1 is communicated with the first oil port 5, and oil enters the impact cylinder body after sequentially passing through the oil inlet 1 and the first oil port 5; when big case 4 moved to the right position, first hydraulic fluid port 5 was linked together with oil return opening 2 to satisfy the oil return demand of strikeing the jar, in the fluid flowed into outside oil tank through first hydraulic fluid port 5 and oil return opening 2 in proper order, this kind of control mode that adopts big case 4 left right side to move had reduced the space of valve body, and this kind of design makes the switching-over oil consumption low simultaneously, and response time is short.

Referring to fig. 2 and 3, a valve element limiting block 6 is installed on the left side of the valve cavity 3, a valve seat 7 is installed on the right side of the valve cavity 3, a first valve hole 8 which is opened leftwards along the axial direction is formed in the valve seat 7, a small valve element 9 is movably installed in the first valve hole 8, the outer wall of the small valve element 9 is arranged in a sealing manner with the hole wall of the first valve hole 8, a right pressure cavity 10 is formed in the first valve hole 8 and located on the right side of the small valve element 9, a first oil channel 11 is arranged on the valve seat 7, and the oil inlet 1 is communicated with the right pressure cavity 10 through the first oil channel 11; the right part of big case 4 is equipped with evagination pressure step 12, the right part of valve pocket 3 be equipped with pressure step 12 matched with mounting groove 13, the diameter size of mounting groove 13 is greater than the diameter size of valve pocket 3, the outer wall of pressure step 12 with the sealed setting of tank bottom of mounting groove 13, pressure step 12 can be followed mounting groove 13 horizontal slip, the left side pressure face of pressure step 12 with form left pressure chamber 14 between the valve pocket 3, the right-hand member face of pressure step 12 with form third oil pocket 15 between the disk seat 7, third oil pocket 15 with oil return opening 2 is linked together.

When the pressure in the right pressure cavity 10 is greater than the pressure in the left pressure cavity 14, the small valve core 9 pushes the large valve core 4 to move left synchronously; when the pressure in the left pressure cavity 14 is higher than the pressure in the right pressure cavity 10, the big valve core 4 pushes the small valve core 9 to move right synchronously.

When the hydraulic control valve works, the oil inlet 1 feeds oil into the right pressure cavity 10 through the first oil duct 11, when the pressure in the right pressure cavity 10 is greater than the pressure in the left pressure cavity 14, the small valve element 9 pushes the large valve element 4 to move to the left, and the small valve element 9 is controlled to move through pressure difference, so that the large valve element 4 is controlled to move to the left. Compared with a single valve core structure, the split type structure with the large valve core and the small valve core is low in manufacturing difficulty and convenient to assemble and disassemble.

As shown in fig. 4 and 5, a first concave oil groove 20, a second concave oil groove 21, a third concave oil groove 22, a fourth concave oil groove 23 and a fifth concave oil groove 24 are sequentially arranged on the inner wall of the valve chamber 3 from left to right, the first oil groove 20 is connected with the first oil port 5, the second oil groove 21 is communicated with the oil inlet 1, the fourth oil groove 23 is communicated with the left pressure chamber 14, the fourth oil groove 23 is connected with a fourth oil port 25, the fourth oil port 25 is communicated with the third oil groove 22 through a first connection hole 26, and the fifth oil groove 24 is arranged in the third oil chamber 15 and is connected with a fifth oil port 27; the middle part of the outer wall of the big valve core 4 is provided with an inwards concave connecting groove 28, the big valve core 4 is internally provided with a second valve hole 29 which is opened leftwards along the axial direction, and the right end face of the big valve core 4 is also provided with a second connecting hole 30 communicated with the second valve hole 29.

When the large spool 4 moves to the left position, the second oil groove 21 communicates with the first oil groove 20 through a connecting groove 28; when the large valve core 4 moves to the right position, the first oil groove 20 communicates with the second valve hole 29 through the valve chamber 3, and the second oil groove 21 communicates with the third oil groove 22 through the connecting groove 28.

When the valve works, oil is continuously supplied to the second oil groove 21 through the oil inlet 1, when the big valve core 4 is in the left position, the oil sequentially passes through the second oil groove 21, the connecting groove 28 and the first oil groove 20 and enters the impact cylinder body through the first oil port 5, the oil in the impact cylinder body returns to the valve body through the fourth oil port 25 and enters the left pressure cavity 14 through the fourth oil groove 23 to generate pressure on the left pressure surface of the pressure step 12, and when the generated pressure is continuously increased to be larger than the pressure in the right pressure cavity 10, the big valve core 4 is pushed to move to the right position;

when the big valve core 4 is in the right position, the oil in the second oil groove 21 sequentially passes through the connecting groove 28, the third oil groove 22, the first connecting hole 26 and the fourth oil hole 25 and enters the impact cylinder body through the fourth oil hole 25, the oil in the impact cylinder body returns to the valve body through the first oil hole 5, enters the valve cavity 3 through the first oil groove 20, enters the third oil cavity 15 through the second valve hole 29 and the second connecting hole 30 in sequence, pressure is discharged from the oil return hole 2, at this time, the pressure in the left pressure cavity 14 is far smaller than the pressure in the right pressure cavity 10, the pressure of the right pressure cavity 10 drives the small valve core 9 to move to the left, and the big valve core 4 is pushed to move to the left position, so that oil inlet and oil return of the impact cylinder body are controlled by circulation.

The control structure for controlling the oil inlet and the oil return of the impact cylinder body by the two-position four-way valve adopts the middle oil return of the large valve core 4, so that the space of the valve body is reduced, and the differential design of the large valve core 4 and the small valve core 9 ensures that the reversing oil consumption of the valve core is low and the response time is short.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, a schematic representation of the term does not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations can be made by the worker in the light of the above teachings without departing from the spirit of the utility model. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims (3)

1. The utility model provides a control valve structure of formula rock drill is driven on top, includes the valve body, be provided with oil inlet (1), oil return opening (2) and valve pocket (3) in the valve body, its characterized in that: a large valve core (4) is arranged in the valve cavity (3) in a sliding mode, the outer wall of the large valve core (4) is arranged in a sealing mode with the inner wall of the valve cavity (3), a first oil port (5) is further arranged on the valve body, and when the large valve core (4) moves to the left position, the first oil port (5) is communicated with the oil inlet (1); when the big valve core (4) moves to the right position, the first oil port (5) is communicated with the oil return port (2).

2. A control valve structure for a top drive rock drill according to claim 1 wherein: a valve core limiting block (6) is installed on the left side of the valve cavity (3), a valve seat (7) is installed on the right side of the valve cavity (3), a first valve hole (8) which is opened leftwards along the axial direction is formed in the valve seat (7), a small valve core (9) is movably installed in the first valve hole (8), the outer wall of the small valve core (9) is hermetically arranged with the hole wall of the first valve hole (8), a right pressure cavity (10) is formed in the first valve hole (8) and located on the right side of the small valve core (9), a first oil duct (11) is arranged on the valve seat (7), and the oil inlet (1) is communicated with the right pressure cavity (10) through the first oil duct (11);

the right part of the big valve core (4) is provided with an outward convex pressure step (12), the right part of the valve cavity (3) is provided with a mounting groove (13) matched with the pressure step (12), the diameter size of the mounting groove (13) is larger than that of the valve cavity (3), the outer wall of the pressure step (12) is hermetically arranged with the groove bottom of the mounting groove (13), the pressure step (12) can slide left and right along the mounting groove (13), a left pressure cavity (14) is formed between the left pressure surface of the pressure step (12) and the valve cavity (3), a third oil cavity (15) is formed between the right end surface of the pressure step (12) and the valve seat (7), and the third oil cavity (15) is communicated with the oil return port (2);

when the pressure in the right pressure cavity (10) is greater than the pressure in the left pressure cavity (14), the small valve core (9) pushes the large valve core (4) to move leftwards synchronously; when the pressure in the left pressure cavity (14) is larger than the pressure in the right pressure cavity (10), the large valve core (4) pushes the small valve core (9) to move rightwards synchronously.

3. A control valve structure for a top drive rock drill according to claim 2 wherein: the inner wall of the valve cavity (3) is sequentially provided with a first concave oil groove (20), a second concave oil groove (21), a third concave oil groove (22), a fourth concave oil groove (23) and a fifth concave oil groove (24) from left to right, the first concave oil groove (20) is connected with the first oil port (5), the second concave oil groove (21) is communicated with the oil inlet (1), the fourth concave oil groove (23) is communicated with the left pressure cavity (14), the fourth concave oil groove (23) is connected with a fourth oil port (25), the fourth oil port (25) is communicated with the third concave oil groove (22) through a first connecting hole (26), and the fifth concave oil groove (24) is arranged in the third oil cavity (15) and is connected with a fifth oil port (27);

an inwards concave connecting groove (28) is formed in the middle of the outer wall of the large valve core (4), a second valve hole (29) which is opened leftwards along the axial direction is formed in the large valve core (4), and a second connecting hole (30) communicated with the second valve hole (29) is further formed in the right end face of the large valve core (4);

when the large valve core (4) moves to the left position, the second oil groove (21) is communicated with the first oil groove (20) through a connecting groove (28); when the big valve core (4) moves to the right position, the first oil groove (20) is communicated with the second valve hole (29) through the valve cavity (3), and the second oil groove (21) is communicated with the third oil groove (22) through the connecting groove (28).

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