CN216110509U - Sleeve valve type impact cylinder structure of full hydraulic rock drill - Google Patents

Abstract

The utility model provides a sleeve valve type impact cylinder structure of a full-hydraulic rock drill, which comprises an impact cylinder body, an impact piston and a control valve, wherein a main oil inlet and an oil return port are formed in the impact cylinder body, a front cylinder sleeve and a rear cylinder sleeve are fixedly installed in an inner cavity of the impact cylinder body, a front oil inlet is formed in the front cylinder sleeve, a rear oil inlet is formed in the rear cylinder sleeve, the control valve is installed in inner holes of the front cylinder sleeve and the rear cylinder sleeve, the impact piston is inserted into a valve hole of the control valve in a penetrating mode, a hydraulic control oil path is formed between the control valve and the impact piston, and the hydraulic control oil path can drive the impact piston to move left and right. The structure form of the impact cylinder is simplified through the sleeve valve design structure, the control valve is located between the impact cylinder and the impact piston, most of step holes and the oil grooves are transferred to the front cylinder sleeve and the rear cylinder sleeve, the two parts are good in manufacturability, the service life of the product is effectively prolonged, maintenance is facilitated, and the maintenance cost is low.

Description

Sleeve valve type impact cylinder structure of full hydraulic rock drill

Technical Field

The utility model relates to a sleeve valve type impact cylinder structure of a full-hydraulic rock drill.

Background

The valve oil distribution type hydraulic rock drill designed in the domestic market at present adopts a control valve and an impact cavity which are separately designed, so that although the design is small in internal leakage and low in oil consumption, the structure is complex due to independent design of an external valve, the whole weight is large, the service life of the rock drill is short due to the factors such as machining precision and oil cleanliness, the service life is generally shorter than 1000 hours, and the design is far shorter than that of a rock drill imported from abroad. And the impact cavity of the impact cylinder with the outer valve structure is a multi-stage step hole, the requirements on cylindricity and coaxiality of the step hole are higher, the process difficulty is ensured, the impact piston and the impact cavity are difficult to form an effective oil film, the impact piston and the impact cavity cannot be in a floating state, and the cylinder pulling phenomenon often occurs.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problems that the valve oil distribution type hydraulic rock drill designed in the domestic market at present adopts a control valve and an impact cavity which are separately designed, the structure is relatively complex, the integral weight is relatively large, and the processing difficulty is high.

The technical scheme adopted by the utility model for solving the technical problems is as follows: a sleeve valve type impact cylinder structure of a full hydraulic rock drill comprises an impact cylinder body, an impact piston and a control valve, wherein a main oil inlet and an oil return port are formed in the impact cylinder body, a front cylinder sleeve and a rear cylinder sleeve are fixedly installed in an inner cavity of the impact cylinder body, the front cylinder sleeve and the rear cylinder sleeve are arranged in a collinear mode, a front oil inlet is formed in the front cylinder sleeve, a rear oil inlet is formed in the rear cylinder sleeve, and the front oil inlet and the rear oil inlet are communicated with the main oil inlet; the control valve is installed in inner holes of the front cylinder sleeve and the rear cylinder sleeve and can move left and right in the inner holes of the front cylinder sleeve and the rear cylinder sleeve; the impact piston is inserted into a valve hole of the control valve, a hydraulic control oil path is arranged between the control valve and the impact piston, and the hydraulic control oil path can drive the impact piston to move left and right.

Further: the hydraulic control oil way comprises a first oil duct and a second oil duct, a valve seat is installed at the right part of an inner hole of the rear cylinder sleeve, a first installation groove which is concave along the axial direction is formed in the left end face of the rear cylinder sleeve, a limiting clamping table which is convex along the radial direction is arranged in the middle of the control valve, the limiting clamping table is arranged in the first installation groove in a sliding mode, and the outer wall of the limiting clamping table is arranged in a sealing mode with the groove wall of the first installation groove; the middle part of the impact piston is provided with control steps and pressure steps which are outwards protruded along the circumferential direction at intervals, the outer walls of the control steps and the pressure steps are arranged in a sealing way with the hole wall of the valve hole, and the area of the left pressure surface of the pressure step is smaller than that of the right pressure surface; in the valve hole, a space on the right side of the right pressure surface is a right pressure cavity, and in the valve hole, a space on the left side of the left pressure surface is a left pressure cavity; a first oil return groove is formed in the groove bottom of the first mounting groove, one end of the first oil return groove is communicated with the oil return opening, the other end of the first oil return groove is communicated with the valve hole through a third oil duct, a second oil return groove is formed in the rear cylinder sleeve, one end of the second oil return groove is communicated with the oil return opening, a fourth oil duct communicated with the valve hole is formed in the control valve, a connecting opening is further formed in the control valve, and oil can flow between the left pressure cavity and the left end face of the limiting clamping table through the connecting opening; when the control valve moves to the left position, the left end face of the limiting clamping table abuts against the right end face of the front cylinder sleeve, the right end of the control valve is far away from the valve seat to form the first oil duct, the rear oil inlet is communicated with the right pressure cavity through the first oil duct, and meanwhile, the fourth oil duct is far away from the second oil return groove and is disconnected and communicated with the second oil return groove; when the control valve moves to the right position, the right end face of the control valve abuts against the valve seat, the first oil duct is closed, and meanwhile, the fourth oil duct is communicated with the second oil return groove; when the impact piston moves to the left position, the control step is far away from the valve hole to form a second oil channel, the forward oil port is communicated with the left pressure cavity through the second oil channel, meanwhile, the pressure step is abutted against the third oil channel, the pressure step is far away from the fourth oil channel, and the fourth oil channel is communicated with the right pressure cavity; when the impact piston moves to the right position, the outer wall of the control step and the hole wall of the valve hole are arranged in a sealing mode, the second oil duct is closed, meanwhile, the side wall of the pressure step abuts against the fourth oil duct, the pressure step is far away from the connecting port, and the connecting port is communicated with the third oil duct through the left pressure cavity.

Further: a supporting sleeve is arranged on the right side of the rear cylinder sleeve, the supporting sleeve is fixedly installed in an inner cavity of the impact cylinder body, the right part of the impact piston is installed in an inner hole of the supporting sleeve and can move in the inner hole of the supporting sleeve along the axial direction, and the outer wall of the impact piston and the inner hole wall of the supporting sleeve are arranged in a sealing mode; and a second mounting groove which is inwards concave along the axial direction is arranged on the left end surface of the front cylinder sleeve, a guide sleeve is mounted in the second mounting groove, and the left part of the impact piston is mounted in an inner hole of the guide sleeve and can move along the axial direction in the inner hole of the guide sleeve.

The sleeve valve type impact cylinder structure of the full-hydraulic rock drill has the advantages that the structural form of the impact cylinder is simplified through the sleeve valve design structure, the control valve is positioned between the impact cylinder and the impact piston, most of the step holes and the oil grooves are transferred to the front cylinder sleeve and the rear cylinder sleeve, the manufacturability of the two parts is good, the service life of a product is effectively prolonged, the maintenance is convenient, and the maintenance cost is low.

Drawings

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

Fig. 1 is a schematic structural diagram of a sleeve valve type impact cylinder structure of a full hydraulic rock drill of the utility model;

FIG. 2 is a schematic view of the impact piston installed in the control valve;

FIG. 3 is a schematic of the structure of the impulse piston;

FIG. 4 is a schematic diagram of the structure of the return stroke start state;

FIG. 5 is a schematic diagram of the structure during the return-to-zero process;

FIG. 6 is a schematic structural view of a forward striking start state;

fig. 7 is a schematic structural view of the normal striking end state.

In the figure, 1, an impact cylinder body, 2, an impact piston, 3, a control valve, 30, a valve hole, 4, a main oil inlet, 5, an oil return opening, 6, a front cylinder sleeve, 7, a rear cylinder sleeve, 8, a front oil inlet, 9, a rear oil inlet, 10, a first oil duct, 11, a second oil duct, 12, a valve seat, 13, a first mounting groove, 14, a limiting clamping table, 15, a control step, 16, a pressure step, 17, a right pressure chamber, 18, a left pressure chamber, 19, a first oil return groove, 20, a third oil duct, 21, a second oil return groove, 22, a fourth oil duct, 23, a connecting port, 24, a supporting sleeve, 25 and a guide sleeve.

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 and 2, the utility model provides a sleeve valve type impact cylinder structure of a full hydraulic rock drill, which comprises an impact cylinder body 1, an impact piston 2 and a control valve 3, wherein a main oil inlet 4 and an oil return port 5 are arranged on the impact cylinder body 1, a front cylinder sleeve 6 and a rear cylinder sleeve 7 are fixedly installed in an inner cavity of the impact cylinder body 1, the front cylinder sleeve 6 and the rear cylinder sleeve 7 are arranged in a collinear manner, a front oil inlet 8 is arranged on the front cylinder sleeve 6, a rear oil inlet 9 is arranged on the rear cylinder sleeve 7, and the front oil inlet 8 and the rear oil inlet 9 are both communicated with the main oil inlet 4; the control valve 3 is installed in inner holes of the front cylinder sleeve 6 and the rear cylinder sleeve 7 and can move left and right in the inner holes of the front cylinder sleeve 6 and the rear cylinder sleeve 7; the impact piston 2 is inserted into the valve hole 30 of the control valve 3, and a hydraulic control oil path capable of driving the impact piston 2 to move left and right is arranged between the control valve 3 and the impact piston 2.

The structure form of the impact cylinder is simplified by the sleeve valve design structure, the control valve 3 is located between the impact cylinder and the impact piston 2, the sleeve valve design structure transfers the step holes to the control valve 3, the front cylinder sleeve 6 and the rear cylinder sleeve 7, and the two parts have good manufacturability, so that the product life is effectively prolonged, the maintenance is convenient, and the maintenance cost is low.

Referring to fig. 3, 4, 5, 6 and 7, the hydraulic control oil path includes a first oil path 10 and a second oil path 11, a valve seat 12 is installed at the right portion of an inner hole of the rear cylinder sleeve 7, a first mounting groove 13 that is recessed along the axial direction is formed in the left end surface of the rear cylinder sleeve 7, a limiting clamping table 14 that is protruding outward along the radial direction is arranged in the middle of the control valve 3, the limiting clamping table 14 is slidably arranged in the first mounting groove 13, and the outer wall of the limiting clamping table 14 is hermetically arranged with the groove wall of the first mounting groove 13; the middle part of the impact piston 2 is provided with a control step 15 and a pressure step 16 which are protruded outwards along the circumferential direction at intervals, the outer walls of the control step 15 and the pressure step 16 are both arranged with the hole wall of the valve hole 30 in a sealing way, and the area of the left pressure surface of the pressure step 16 is smaller than that of the right pressure surface; a space in the valve hole 30 on the right side of the right pressure surface is a right pressure chamber 17, and a space in the valve hole 30 on the left side of the left pressure surface is a left pressure chamber 18; the bottom of the first mounting groove 13 is provided with a first oil return groove 19, one end of the first oil return groove 19 is communicated with the oil return opening 5, the other end of the first oil return groove 19 is communicated with the valve hole 30 through a third oil duct 20, the rear cylinder sleeve 7 is provided with a second oil return groove 21, one end of the second oil return groove 21 is communicated with the oil return opening 5, the control valve 3 is provided with a fourth oil duct 22 communicated with the valve hole 30, the control valve 3 is further provided with a connecting port 23, and oil can flow between the left pressure cavity 18 and the left end face of the limiting clamping table 14 through the connecting port 23.

When the control valve 3 moves to the left position, the left end face of the limiting clamping table 14 abuts against the right end face of the front cylinder sleeve 6, the right end of the control valve 3 is far away from the valve seat 12 to form the first oil duct 10, the rear oil inlet 9 is communicated with the right pressure cavity 17 through the first oil duct 10, and meanwhile, the fourth oil duct 22 is far away from the second oil return groove 21 and is disconnected from the second oil return groove 21.

When the control valve 3 moves to the right position, the right end face of the control valve 3 abuts against the valve seat 12, the first oil passage 10 is closed, and meanwhile, the fourth oil passage 22 is communicated with the second oil return groove 21.

When the impact piston 2 moves to the left position, the control step 15 is far away from the valve hole 30 to form a second oil passage 11, the front oil inlet 8 is communicated with the left pressure cavity 18 through the second oil passage 11, meanwhile, the pressure step 16 is abutted against the third oil passage 20, the pressure step 16 is far away from the fourth oil passage 22, and the fourth oil passage 22 is communicated with the right pressure cavity 17.

When the impact piston 2 moves to the right position, the outer wall of the control step 15 and the hole wall of the valve hole 30 are arranged in a sealing manner, the second oil passage 11 is closed, meanwhile, the side wall of the pressure step 16 abuts against the fourth oil passage 22, the pressure step 16 is far away from the connecting port 23, and the connecting port 23 is communicated with the third oil passage 20 through the left pressure cavity 18.

In operation, the control valve 3 and the impact piston 2 are controlled to move between the left position and the right position through a hydraulic control oil path, so that the impact piston 2 is cycled between four states:

s1 begins to return, at this time, the impact piston 2 is at the left position, the control valve 3 is at the right position, the second oil duct 11 is opened, the first oil duct 10 is closed, oil is continuously injected into the left pressure chamber 18 to form pressure on the left pressure surface of the pressure step 16, and the oil in the right pressure chamber 17 flows out from the oil return port 5 through the fourth oil duct 22 and the second oil return groove 21, and the return begins;

s2 returning to the zero position, the impact piston 2 returning to the right position under the action of pressure, the control valve 3 still being in the right position, the first oil duct 10 and the second oil duct 11 both being closed, the oil entering from the rear oil inlet 9 forming pressure on the right end face of the control valve 3 and pushing the control valve 3 to move left;

s3, when the control valve 3 moves to the left position, the first oil passage 10 is opened, meanwhile, the side wall of the pressure step 16 is abutted against the fourth oil passage 22, the right pressure cavity 17 is disconnected from the fourth oil passage 22, and the pressure of the injected oil on the right pressure surface of the pressure step 16 is increased continuously, so that the impact piston 2 is pushed to start moving to the left;

s4, when the impact piston 2 moves to the left position, oil entering from the front oil inlet 8 forms pressure on the left end face of the control valve 3, the oil in the left pressure cavity 18 enters the top of the left end face of the limit clamping table 14 through the connecting port 23 to form pressure, and the two pressures simultaneously push the control valve 3 to move right.

A supporting sleeve 24 is arranged on the right side of the rear cylinder sleeve 7, the supporting sleeve 24 is fixedly installed in an inner cavity of the impact cylinder body 1, the right part of the impact piston 2 is installed in an inner hole of the supporting sleeve 24 and can move in the inner hole of the supporting sleeve 24 along the axial direction, and the outer wall of the impact piston 2 and the inner hole wall of the supporting sleeve 24 are arranged in a sealing mode; and a second mounting groove which is inwards concave along the axial direction is arranged on the left end surface of the front cylinder sleeve 6, a guide sleeve 25 is mounted in the second mounting groove, and the left part of the impact piston 2 is mounted in an inner hole of the guide sleeve 25 and can move along the axial direction in the inner hole of the guide sleeve 25. The mode of supporting the front end and the rear end of the impact piston 2 can ensure the stability of the impact piston 2 during movement.

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 sleeve valve formula of full-hydraulic rock drill strikes cylinder structure, includes strikes cylinder body (1), strikes piston (2) and control valve (3), it is provided with main oil inlet (4) and oil return opening (5) on the cylinder body (1) to strike, its characterized in that: a front cylinder sleeve (6) and a rear cylinder sleeve (7) are fixedly mounted in an inner cavity of the impact cylinder body (1), the front cylinder sleeve (6) and the rear cylinder sleeve (7) are arranged in a collinear manner, a front oil inlet (8) is formed in the front cylinder sleeve (6), a rear oil inlet (9) is formed in the rear cylinder sleeve (7), and the front oil inlet (8) and the rear oil inlet (9) are both communicated with the main oil inlet (4);

the control valve (3) is installed in inner holes of the front cylinder sleeve (6) and the rear cylinder sleeve (7) and can move left and right in the inner holes of the front cylinder sleeve (6) and the rear cylinder sleeve (7);

the impact piston (2) is inserted into a valve hole (30) of the control valve (3), a hydraulic control oil path is arranged between the control valve (3) and the impact piston (2), and the hydraulic control oil path can drive the impact piston (2) to move left and right.

2. The sleeve valve type impact cylinder structure of the full hydraulic rock drill according to claim 1, characterized in that: the hydraulic control oil way comprises a first oil duct (10) and a second oil duct (11), a valve seat (12) is installed at the right part of an inner hole of the rear cylinder sleeve (7), a first installation groove (13) which is concave along the axial direction is formed in the left end face of the rear cylinder sleeve (7), a limiting clamping table (14) which is convex along the radial direction is arranged in the middle of the control valve (3), the limiting clamping table (14) is arranged in the first installation groove (13) in a sliding mode, and the outer wall of the limiting clamping table (14) is arranged in a sealing mode with the groove wall of the first installation groove (13);

the middle part of the impact piston (2) is provided with control steps (15) and pressure steps (16) which are protruded outwards along the circumferential direction at intervals, the outer walls of the control steps (15) and the pressure steps (16) are arranged with the hole wall of the valve hole (30) in a sealing mode, and the area of the left pressure surface of the pressure step (16) is smaller than that of the right pressure surface; in the valve hole (30), the space on the right side of the right pressure surface is a right pressure cavity (17), and in the valve hole (30), the space on the left side of the left pressure surface is a left pressure cavity (18);

a first oil return groove (19) is formed in the groove bottom of the first mounting groove (13), one end of the first oil return groove (19) is communicated with the oil return opening (5), the other end of the first oil return groove (19) is communicated with the valve hole (30) through a third oil duct (20), a second oil return groove (21) is formed in the rear cylinder sleeve (7), one end of the second oil return groove (21) is communicated with the oil return opening (5), a fourth oil duct (22) communicated with the valve hole (30) is formed in the control valve (3), a connecting opening (23) is further formed in the control valve (3), and oil can flow between the left pressure cavity (18) and the left end face of the limiting clamping table (14) through the connecting opening (23);

when the control valve (3) moves to the left position, the left end face of the limiting clamping table (14) abuts against the right end face of the front cylinder sleeve (6), the right end of the control valve (3) is far away from the valve seat (12) to form the first oil duct (10), the rear oil inlet (9) is communicated with the right pressure cavity (17) through the first oil duct (10), and meanwhile, the fourth oil duct (22) is far away from the second oil return groove (21) and is disconnected and communicated with the second oil return groove (21);

when the control valve (3) moves to the right position, the right end face of the control valve (3) abuts against the valve seat (12), the first oil duct (10) is closed, and meanwhile, the fourth oil duct (22) is communicated with the second oil return groove (21);

when the impact piston (2) moves to the left position, the control step (15) is far away from the valve hole (30) to form a second oil channel (11), the oil inlet (8) is communicated with the left pressure cavity (18) through the second oil channel (11), meanwhile, the pressure step (16) is abutted against the third oil channel (20), the pressure step (16) is far away from the fourth oil channel (22), and the fourth oil channel (22) is communicated with the right pressure cavity (17);

when the impact piston (2) moves to the right position, the outer wall of the control step (15) and the hole wall of the valve hole (30) are arranged in a sealing mode, the second oil channel (11) is closed, meanwhile, the side wall of the pressure step (16) abuts against the fourth oil channel (22), the pressure step (16) is far away from the connecting port (23), and the connecting port (23) is communicated with the third oil channel (20) through the left pressure cavity (18).

3. The sleeve valve type impact cylinder structure of the full hydraulic rock drill according to claim 1, characterized in that: a supporting sleeve (24) is arranged on the right side of the rear cylinder sleeve (7), the supporting sleeve (24) is fixedly installed in an inner cavity of the impact cylinder body (1), the right part of the impact piston (2) is installed in an inner hole of the supporting sleeve (24) and can move in the inner hole of the supporting sleeve (24) along the axial direction, and the outer wall of the impact piston (2) and the inner hole wall of the supporting sleeve (24) are arranged in a sealing mode;

the left end face of the front cylinder sleeve (6) is provided with a second mounting groove which is inwards concave along the axial direction, a guide sleeve (25) is mounted in the second mounting groove, and the left part of the impact piston (2) is mounted in an inner hole of the guide sleeve (25) and can move along the axial direction in the inner hole of the guide sleeve (25).

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