Split valve and hydraulic rock drill

Abstract

The utility model relates to a kind of split valve and hydraulic rock drill, wherein, split valve includes the valve body and valve pad of split setting, the inside of the valve body is equipped with center hole, the outer surface of the valve body includes the first torus, first transition surface, second torus, second transition surface, third torus in turn and connect along axis direction, the first torus, the second torus, the third torus are coaxially arranged with the center hole, the diameter of the second torus is all greater than the diameter of the first torus, the diameter of the third torus, the length of the first torus along axis direction is less than the length of the third torus along axis direction, the valve pad is sleeved on the first torus and with the first transition surface abuts. The utility model uses split structure, can exert a comprehensive and uniform thrust to valve body, improve valve body stress uniformity, avoid the phenomenon that valve body appears local cracking or overall fracture, improve overall working stability.

Description

Technical Field

[0001] This utility model relates to the field of rock drill technology, and in particular to a split valve and a hydraulic rock drill. Background Technology

[0002] With social progress and scientific development, rock drills have attracted increasing public attention, and related technologies have made rapid advancements. Specifically, rock drills operate on the principle of impact crushing. During operation, the piston reciprocates at high frequency, continuously impacting the drill bit. Under the impact force, the drill bit head crushes the rock and drills to a certain depth, forming a notch. After the piston retracts, the drill bit rotates at a certain angle, and the piston moves forward, impacting the drill bit again, forming a new notch. The fan-shaped rock block between the two notches is sheared by the horizontal component force generated on the drill bit. The piston continuously impacts the drill bit, and compressed air or pressurized water is continuously input through the central hole of the drill bit, expelling rock debris from the hole, thus forming a circular borehole of a certain depth.

[0003] In existing hydraulic rock drills, when the piston undergoes high-frequency reciprocating motion, the valve body, which is sleeved outside the piston, also undergoes high-frequency reciprocating motion under the action of the front and rear push rods. When the push rods contact the valve body and apply thrust, because there are multiple push rods, the synchronization of their movements cannot be guaranteed. Therefore, there is a problem of uneven force on the valve body. With long-term high-frequency reciprocating motion, the valve body is prone to local cracking or overall breakage, which affects the stable operation of the hydraulic rock drill.

[0004] Therefore, there is a need for a split valve and hydraulic rock drill that adopts a split structure to improve the uniformity of force on the valve body, avoid local cracking or overall breakage of the valve body, and improve the overall working stability. Utility Model Content

[0005] In order to overcome the shortcomings of the existing technology, this utility model provides a split valve and a hydraulic rock drill.

[0006] The technical solution of this utility model is as follows: A split valve includes a valve body and a valve gasket that are separately configured. The valve body has a central hole inside. The outer surface of the valve body includes a first annular surface, a first transition surface, a second annular surface, a second transition surface, and a third annular surface that are sequentially connected along the axial direction. The first annular surface, the second annular surface, and the third annular surface are all coaxially arranged with the central hole. The diameter of the second annular surface is larger than the diameter of the first annular surface and the diameter of the third annular surface. The length of the first annular surface along the axial direction is smaller than the length of the third annular surface along the axial direction. The valve gasket is sleeved on the first annular surface and abuts against the first transition surface.

[0007] As a further improvement of this utility model, the first transition surface includes a first curved surface and a first plane that are in contact. The first plane is perpendicular to the axial direction. The first curved surface is in contact with the first annular surface, and the first plane is in contact with the second annular surface.

[0008] As a further improvement of this utility model, the second transition surface includes a second plane, a second curved surface, and a first conical surface that are connected in sequence. The second plane is perpendicular to the axial direction, the second plane is connected to the second annular surface, and the first conical surface is connected to the third annular surface.

[0009] As a further improvement of this utility model, the second curved surface is provided with an inwardly recessed first groove, forming a clearance groove.

[0010] As a further improvement of this utility model, the first conical surface is provided with an inwardly recessed second groove at one end near the second curved surface, and the first groove and the second groove are combined to form the clearance groove.

[0011] As a further improvement of this utility model, the inner surface of the valve body includes a fourth annular surface and a second conical surface that are connected along the axial direction. The fourth annular surface and the second conical surface are both coaxially arranged with the central hole. The end of the second conical surface with a smaller diameter is connected to the fourth annular surface. The fourth annular surface is close to the first annular surface, and the second conical surface is close to the third annular surface.

[0012] As a further improvement of this utility model, the valve pad includes a ring body sleeved on the first annular surface, and a plurality of protrusions extending radially away from the ring body are formed on the outer surface of the ring body.

[0013] As a further improvement of this utility model, the valve pad is provided with an anti-suction groove on the side away from the second annular surface.

[0014] As a further improvement of this utility model, the anti-sucking groove includes an annular groove coaxial with the valve pad and a plurality of linear grooves connecting the annular groove and the outer wall of the valve pad.

[0015] A hydraulic rock drill includes a body, which contains an impact piston and a split valve as described above. The split valve is sleeved on the surface of the impact piston. The body also contains a front push rod and a rear push rod that push the split valve to move. The front push rod acts on the valve pad, and the rear push rod acts on the second transition surface.

[0016] According to the above-described solution, the beneficial effects of this utility model are as follows: This invention employs a split structure. The thrust applied by the front push rod first acts on the valve pad and then is transmitted to the valve body. When there is a deviation in the movement of multiple front push rods, the valve pad, being annular, can gather the total thrust applied by all the front push rods and distribute the total thrust to various parts of the valve pad. When the valve pad transmits the total thrust to the valve body, it can apply a comprehensive and uniform thrust to the valve body, improving the uniformity of the force on the valve body, avoiding local cracking or overall breakage of the valve body, and improving the overall working stability. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the split valve of this utility model; Figure 2 This is a structural schematic diagram of the valve body of this utility model from a first angle; Figure 3 This is a partial enlarged view of point A in this utility model; Figure 4 This is a structural schematic diagram of the valve body of this utility model from a second angle; Figure 5 This is a schematic diagram of the valve gasket structure of this utility model.

[0018] In the figure: 1. Valve body; 11. Center hole; 12. First annular surface; 13. Second annular surface; 14. Third annular surface; 151. First curved surface; 152. First flat surface; 161. Second flat surface; 162. Second curved surface; 163. First conical surface; 164. First groove; 165. Second groove; 17. Fourth annular surface; 18. Second conical surface; 2. Valve gasket; 21. Ring body; 22. Protrusion; 23. Annular groove; 24. Groove. Detailed Implementation

[0019] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0022] See Figure 1-4 This utility model provides a split valve, including a valve body 1 and a valve pad 2, which are separately configured. The front push rod of a rock drill acts on the valve pad 2, that is, multiple front push rods apply axial thrust to the valve pad 2. The valve body 1 has a central hole 11 inside. The outer surface of the valve body 1 includes a first annular surface 12, a first transition surface, a second annular surface 13, a second transition surface, and a third annular surface 14 connected sequentially along the axial direction. The first annular surface 12, the second annular surface 13, and the third annular surface 14 are all mounting surfaces of the valve body 1, and the first transition surface and the second transition surface are the force-bearing surfaces of the valve body 1. The force of the front push rod of the rock drill acts on the first transition surface, and the force of the rear push rod of the rock drill acts on the second transition surface. Under the thrust of the front push rod and the rear push rod, the valve body 1 achieves reciprocating motion. The first annular surface 12, the second annular surface 13, and the third annular surface 14 are all coaxially arranged with the central hole 11. The diameter of the second annular surface 13 is larger than the diameter of the first annular surface 12. The diameter of the three annular surfaces 14 is such that the length of the first annular surface 12 along the axial direction is less than the length of the third annular surface 14 along the axial direction. The valve pad 2 is fitted on the first annular surface 12 and abuts against the first transition surface. Since the length of the first annular surface 12 along the axial direction is shorter, the shear force on the valve body 1 in the first annular surface 12 part is smaller, and the risk of damage to the valve body 1 is smaller. Therefore, there is no need to add a valve pad 2 on the third annular surface 14. This utility model adopts a split structure. The thrust applied by the front push rod first acts on the valve pad 2 and then is transmitted to the valve body 1. When there is a deviation in the action of multiple front push rods, since the valve pad 2 is annular, it can gather the total thrust applied by all the front push rods and distribute the total thrust to all parts of the valve pad 2. When the valve pad 2 transmits the total thrust to the valve body 1, it can apply a comprehensive and uniform thrust to the valve body 1, improve the uniformity of the force on the valve body 1, avoid the phenomenon of local cracking or overall breakage of the valve body 1, and improve the overall working stability.

[0023] As an embodiment of this utility model, the first transition surface includes a first curved surface 151 and a first plane 152 that are in contact. The first plane 152 is perpendicular to the axial direction. The first curved surface 151 is in contact with the first annular surface 12, and the first plane 152 is in contact with the second annular surface 13. After the valve pad 2 is pushed by the front push rod, it abuts against the first plane 152. That is, the first plane 152 is the force-bearing surface of the valve body 1 that bears the push force from the front push rod. The first curved surface 151 is provided between the first plane 152 and the first annular surface 12. This can not only avoid the first plane 152 and the first annular surface 12 from intersecting perpendicularly and forming a right angle, which would affect the fit with the valve pad 2, but also improve the connection strength between the first plane 152 and the first annular surface 12 to a certain extent, reduce the risk of breakage between the first plane 152 and the first annular surface 12, and effectively improve the working stability and safety.

[0024] In one embodiment of this utility model, the second transition surface includes a second plane 161, a second curved surface 162, and a first conical surface 163 connected in sequence. The second plane 161 is perpendicular to the axial direction and is connected to the second annular surface 13. The first conical surface 163 is connected to the third annular surface 14. The second plane 161 serves as the force-bearing surface of the valve body 1 that receives the thrust from the rear push rod. The second curved surface 162 is provided between the second plane 161 and the third annular surface 14. This not only avoids the right angle that would result from the perpendicular intersection of the second plane 161 and the third annular surface 14, which would affect the cooperation with the rear push rod, but also provides a certain degree of flexibility. To a certain extent, this improves the connection strength between the second plane 161 and the third annular surface 14, reduces the risk of breakage between them, and effectively improves operational stability and safety. Optionally, the first plane 152 and the second plane 161 are mirror images of each other, and the first curved surface 151 and the second curved surface 162 are mirror images of each other. In addition, since the length of the third annular surface 14 along the axial direction is greater than the length of the first annular surface 12 along the axial direction, a first conical surface 163 is provided between the second curved surface 162 and the third annular surface 14, which can further improve the connection strength between the second plane 161 and the third annular surface 14.

[0025] As one embodiment of this utility model, the second curved surface 162 is provided with an inwardly recessed first groove 164, forming a clearance groove. Preferably, there are multiple first grooves 164, that is, multiple clearance grooves are provided. The clearance grooves can make way for the rear push rod, thereby reducing the radius difference between the second annular surface 13 and the third annular surface 14 to a certain extent. Considering the stability and working strength, the radius of the third annular surface 14, the dimensions of both ends of the second curved surface 162, and the dimensions of both ends of the first conical surface 163 all need to meet certain conditions, that is, the radius of the third annular surface 14... The dimensions of both ends of the second curved surface 162 and the dimensions of both ends of the first conical surface 163 are basically determined. In order to meet the thrust conditions of the rear push rod on the valve body 1, the diameter of the rear push rod also needs to meet certain dimensions, that is, the diameter of the rear push rod is also basically determined, so that the radius difference between the second annular surface 13 and the second curved surface 162 needs to be greater than or equal to the diameter of the rear push rod. By opening the first groove 164 on the second curved surface 162, the radius of the second annular surface 13 can be effectively reduced, thereby reducing the overall size of the valve body 1, which can improve the overall space utilization and reduce the cost of use.

[0026] As an embodiment of this utility model, the first conical surface 163 is provided with an inwardly recessed second groove 165 at one end near the second curved surface 162. The first groove 164 and the second groove 165 are combined to form a relief groove. Preferably, there are multiple second grooves 165, and the number of second grooves 165 and first grooves 164 are equal and correspond one-to-one. The first grooves 164 and second grooves 165 cooperate to form a larger relief groove, thereby further reducing the radius of the second annular surface 13, further reducing the overall size of the valve body 1, and improving the overall space utilization.

[0027] In one embodiment of this utility model, a plurality of first grooves 164 are evenly distributed on the second curved surface 162, and a plurality of second grooves 165 are evenly distributed on the first conical surface 163, and the number of first grooves 164 and second grooves 165 is the same as the number of rear push rods.

[0028] As an embodiment of this utility model, the inner surface of the valve body 1 includes a fourth annular surface 17 and a second conical surface 18 connected along the axial direction. The fourth annular surface 17 and the second conical surface 18 are both coaxially arranged with the central hole 11. The end of the second conical surface 18 with a smaller diameter is connected to the fourth annular surface 17. The fourth annular surface 17 is close to the first annular surface 12, and the second conical surface 18 is close to the third annular surface 14. That is, the end of the central hole 11 close to the first annular surface 12 is cylindrical, while the end of the central hole 11 close to the third annular surface 14 is trumpet-shaped. Under the premise of ensuring working strength, the material used in the valve body 1 can be reduced to a certain extent, thereby reducing the cost of use.

[0029] See Figure 5As an embodiment of the present invention, the valve pad 2 includes a ring body 21 sleeved on the first annular surface 12. A plurality of protrusions 22 extending radially away from the ring body 21 are formed on the outer surface of the ring body 21. The protrusions 22 are used to contact the front push rod and bear the thrust from the front push rod. Therefore, the number of protrusions 22 is greater than or equal to the number of front push rods. Optionally, the number of protrusions 22 is the same as the number of front push rods and corresponds one-to-one. By adding protrusions 22, the size of the valve pad 2 can be effectively reduced, which can improve the overall space utilization and reduce the cost of use.

[0030] As an embodiment of this utility model, the valve pad 2 is provided with an anti-suction groove on the side away from the second annular surface 13. As is well known, when two smooth planes come into contact, they generate suction between each other, making it difficult to separate them. When the split valve is working, the side of the valve pad 2 away from the second annular surface 13 will also come into contact with other components inside the rock drill. Therefore, by adding an anti-suction groove, the suction between the valve pad 2 and other components can be effectively reduced or avoided, thereby improving the working stability and reliability of the split valve.

[0031] As one embodiment of this utility model, the anti-sucking groove can adopt the following three structures: Structure 1: The anti-sucking groove includes at least one groove 24, which can be a straight line, a curve, or a broken line; Structure 2: The anti-sucking groove includes at least one annular groove 23, and the multiple annular grooves 23 can be coaxial or non-coaxial; Structure 3: The anti-sucking groove includes an annular groove 23 coaxial with the valve pad 2 and multiple grooves 24 connecting the annular grooves 23 with the outer wall of the valve pad 2; Of course, the anti-sucking groove can also adopt other structures, such as triangles, rectangles, or other irregular shapes, simply by disrupting the smoothness of the side of the valve pad 2 away from the second annular surface 13.

[0032] This utility model provides a hydraulic rock drill, including a body, an impact piston and a split valve as described above, the split valve being sleeved on the surface of the impact piston, and a front push rod and a rear push rod for pushing the split valve. The front push rod acts on the valve pad 2, and the rear push rod acts on the second transition surface. Optionally, there are six front push rods and six rear push rods, which can effectively reduce the overall failure rate, improve the overall service life and working stability of the hydraulic rock drill, and enhance its market competitiveness.

[0033] In summary, this utility model provides a split valve and a hydraulic rock drill. The split structure allows the thrust applied by the front push rod to first act on the valve pad 2, and then be transmitted to the valve body 1. When there are deviations in the movement of multiple front push rods, the annular shape of the valve pad 2 allows it to gather the total thrust applied by all the front push rods and distribute it throughout the valve pad 2. When the valve pad 2 transmits the total thrust to the valve body 1, it applies a comprehensive and uniform thrust to the valve body 1, improving the uniformity of force distribution and preventing local cracking or overall breakage, thus improving overall operational stability. The first groove 164 and the second groove 165 effectively reduce the radius of the second annular surface 13, thereby reducing the overall size of the valve body 1, improving space utilization and reducing operating costs. The addition of the protrusion 22 effectively reduces the size of the valve pad 2. The addition of the anti-suction groove effectively reduces or prevents suction between the valve pad 2 and other components, improving the operational stability and reliability of the split valve.

[0034] It should be emphasized that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model in any way. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A split valve, characterized in that, The valve includes a valve body (1) and a valve pad (2) that are set separately. The valve body (1) has a central hole (11) inside. The outer surface of the valve body (1) includes a first annular surface (12), a first transition surface, a second annular surface (13), a second transition surface, and a third annular surface (14) that are connected sequentially along the axial direction. The first annular surface (12), the second annular surface (13), and the third annular surface (14) are all coaxially arranged with the central hole (11). The diameter of the second annular surface (13) is greater than the diameter of the first annular surface (12) and the diameter of the third annular surface (14). The length of the first annular surface (12) along the axial direction is less than the length of the third annular surface (14) along the axial direction. The valve pad (2) is sleeved on the first annular surface (12) and abuts against the first transition surface.

2. The split valve according to claim 1, characterized in that, The first transition surface includes a first curved surface (151) and a first plane (152) that are in contact. The first plane (152) is perpendicular to the axial direction. The first curved surface (151) is in contact with the first annular surface (12), and the first plane (152) is in contact with the second annular surface (13).

3. The split valve according to claim 1, characterized in that, The second transition surface includes a second plane (161), a second curved surface (162), and a first conical surface (163) that are connected in sequence. The second plane (161) is perpendicular to the axial direction. The second plane (161) is connected to the second annular surface (13), and the first conical surface (163) is connected to the third annular surface (14).

4. The split valve according to claim 3, characterized in that, The second curved surface (162) is provided with an inwardly recessed first groove (164) and forms a relief groove.

5. The split valve according to claim 4, characterized in that, The first conical surface (163) has an inwardly recessed second groove (165) at one end near the second curved surface (162), and the first groove (164) and the second groove (165) are combined to form the relief groove.

6. The split valve according to claim 1, characterized in that, The inner surface of the valve body (1) includes a fourth annular surface (17) and a second conical surface (18) connected along the axial direction. The fourth annular surface (17) and the second conical surface (18) are both coaxially arranged with the central hole (11). The smaller end of the second conical surface (18) is connected to the fourth annular surface (17). The fourth annular surface (17) is close to the first annular surface (12), and the second conical surface (18) is close to the third annular surface (14).

7. The split valve according to claim 1, characterized in that, The valve pad (2) includes a ring (21) sleeved on the first annular surface (12), and a plurality of protrusions (22) extending radially away from the ring (21) are formed on the outer surface of the ring (21).

8. The split valve according to claim 1, characterized in that, The valve pad (2) has an anti-sucking groove on the side away from the second annular surface (13).

9. The split valve according to claim 8, characterized in that, The anti-sucking groove includes an annular groove (23) coaxial with the valve pad (2) and multiple wire grooves (24) connecting the annular groove (23) and the outer wall of the valve pad (2).

10. A hydraulic rock drill, characterized in that, The device includes a body, which is provided with an impact piston and a split valve as described in any one of claims 1-9. The split valve is sleeved on the surface of the impact piston. The body is also provided with a front push rod and a rear push rod to push the split valve. The front push rod acts on the valve pad (2), and the rear push rod acts on the second transition surface.

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