Full-hydraulic variable-frequency rock drill

Abstract

The utility model provides a full-hydraulic variable-frequency rock drill which comprises a cylinder body, a piston and a reversing valve, and the piston is inserted into the cylinder body in a sliding mode. A first oil groove, a feedback oil channel, an oil drainage groove and a second oil groove are sequentially formed in the cylinder body and located on the periphery of the piston in the axial direction, and the oil drainage groove is communicated with an oil tank. The reversing valve comprises a reversing valve body and a reversing valve element, and the reversing valve element is installed in a valve hole of the reversing valve body in a sliding mode. A hollow reversing valve element structure is adopted, input hydraulic oil is adopted to establish a weak balance state on the two sides of the reversing valve element, the reversing operation of the reversing valve element is achieved in a single-side oil way control mode, the self movement inertia of the reversing valve element is small, response is rapid and sensitive, and the defects that a traditional rock drill is lagged in control, asynchronous, poor in control stability and the like are overcome. And the vibration frequency is low.

Description

Technical Field

[0001] This utility model relates to the field of engineering machinery, and in particular to a fully hydraulic variable frequency rock drill. Background Technology

[0002] Rock drills are mainly used for drilling and blasting in mines, tunnels, and underground blasting operations. They feature high drilling efficiency, long service life, and convenient installation and maintenance. They are primarily used for drilling into soft, medium, and hard rocks. The operation process involves a control valve that controls the impact piston to strike the drill bit. A hydraulic motor drives the drill bit, drill rod, and drill bit to rotate via gears. The drill bit then contacts the rock, breaking it into smaller stones. Compressed air or water is then passed through the drill bit and drill rod to remove slag and clear the rock from the hole.

[0003] To be applicable to different working conditions, existing rock drills usually adopt an external valve control method, which changes the reversing motion of the control valve by controlling the oil circuit. However, existing reversing valves often have problems such as the valve core lagging behind the piston movement, slow reversing, and low maximum piston oscillation frequency during reversing operation. Utility Model Content

[0004] The technical problem to be solved by this utility model is that existing reversing valves often have the following problems during reversing operation: the valve core moves later than the piston, the reversing is slow, and the piston's maximum oscillation frequency is low. This utility model provides a fully hydraulic variable frequency rock drill to solve the above problems.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: a fully hydraulic variable frequency rock drill, including a cylinder body, a piston, and a reversing valve, wherein the piston is slidably inserted into the cylinder body; on the cylinder body, a first oil groove, a feedback oil passage, an oil drain groove, and a second oil groove are sequentially arranged along the axial direction on the outer periphery of the piston, and the oil drain groove is connected to an oil tank; the reversing valve includes a reversing valve body and a reversing valve core, wherein the reversing valve core is slidably installed in the valve hole of the reversing valve body; on the valve hole, a return oil groove, a switching groove, and an inlet oil groove are sequentially arranged along the axial direction on the outer periphery of the reversing valve core, and the inlet oil groove is connected to an oil tank. The oil pipeline includes an oil return groove connected to an oil tank; an oil inlet groove connected to a first oil groove; a switching groove connected to a second oil groove; when the directional valve core is in the left position, the oil inlet groove and the switching groove are connected; when the directional valve core is in the right position, the switching groove and the oil return groove are connected; the directional valve core has a hollow valve core cavity, which is connected to the oil inlet groove; the left end face area of ​​the directional valve core is larger than the right end face area; a step is provided at the right end of the directional valve core; corresponding to the step, a control groove is provided on the valve hole, and the feedback oil passage is connected to the control groove.

[0006] Furthermore: the piston is provided with two shoulders, and the oil drain groove is provided between the two shoulders. When the piston moves axially, the shoulders can switch the communication state of the feedback oil passage with the first oil groove and the oil drain groove respectively.

[0007] Furthermore, the feedback oil passage includes several control oil passages arranged axially, and the control oil passages are respectively connected to the control slot.

[0008] Furthermore, a guide sleeve is provided at the left end of the valve hole, and the left end of the reversing valve core is slidably inserted into the guide sleeve.

[0009] Furthermore, on the cylinder body, support bearings and sealing caps are provided at both ends of the piston, and a sliding sealing ring is installed inside the sealing cap.

[0010] The beneficial effects of this utility model are that the fully hydraulic variable frequency rock drill of this utility model adopts a hollow reversing valve core structure, uses the input hydraulic oil to establish a weak balance state on both sides of the reversing valve core, and uses a single-sided control oil circuit to realize the reversing operation of the reversing valve core. The reversing valve core has a small moment of inertia and responds quickly and sensitively, overcoming the problems of control lag, asynchrony and low vibration frequency of traditional rock drills. Attached Figure Description

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0012] Figure 1 This is a schematic diagram of the hydraulic system of a fully hydraulic variable frequency rock drill at the zero point position according to the present invention;

[0013] Figure 2 This is a schematic diagram of the hydraulic system during the forward stroke;

[0014] Figure 3 This is a schematic diagram of the hydraulic system at the end of a forward stroke;

[0015] Figure 4 This is a schematic diagram of the hydraulic system at the start of the return journey;

[0016] Figure 5 This is a partial structural diagram of a reversing valve.

[0017] In the diagram: 1. Cylinder block; 2. Piston; 3. Reversing valve; 4. First oil groove; 5. Feedback oil passage; 6. Drain groove; 7. Second oil groove; 8. Reversing valve body; 9. Reversing valve core; 10. Return oil groove; 11. Switching groove; 12. Oil inlet groove; 13. Step; 14. Control groove; 15. Shoulder; 16. Control oil passage; 17. Guide sleeve; 18. Support bearing; 19. Sealing cover. Detailed Implementation

[0018] The embodiments of this utility model are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model. Rather, the embodiments of this utility model include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0019] In the description of this utility model, it should 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", 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 the present invention and simplifying the description, and are not intended to 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 the present invention.

[0020] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0021] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of the present invention includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order according to the functions involved, as should be understood by those skilled in the art to which embodiments of the present invention pertain.

[0022] This utility model provides a fully hydraulic variable frequency rock drill, including a cylinder body 1, a piston 2, and a reversing valve 3. The piston 2 is slidably inserted into the cylinder body 1. On the cylinder body 1, a first oil groove 4, a feedback oil passage 5, an oil drain groove 6, and a second oil groove 7 are sequentially arranged along the axial direction on the outer periphery of the piston 2. The oil drain groove 6 is connected to an oil tank. The reversing valve 3 includes a reversing valve body 8 and a reversing valve core 9. The reversing valve core 9 is slidably installed in the valve hole of the reversing valve body 8. On the valve hole, a return oil groove 10, a switching groove 11, and an inlet oil groove 12 are sequentially arranged along the axial direction on the outer periphery of the reversing valve core 9. The inlet oil groove 12 is connected to an oil inlet pipeline. The return oil groove 10, switching groove 11, and inlet oil groove 12 are sequentially arranged along the axial direction on the outer periphery of the reversing valve core 9. The return oil groove 10, switching groove 11, and inlet oil groove 12 are connected to an oil inlet pipeline. 0 is connected to the oil tank; the oil inlet groove 12 is connected to the first oil groove 4, the switching groove 11 is connected to the second oil groove 7, when the reversing valve core 9 is in the left position, the oil inlet groove 12 and the switching groove 11 are connected; when the reversing valve core 9 is in the right position, the switching groove 11 and the return oil groove 10 are connected; the reversing valve core 9 has a hollow valve core cavity, the valve core cavity is connected to the oil inlet groove 12, the left end face area of ​​the reversing valve core 9 is larger than the right end face area; a step 13 is provided at the right end of the reversing valve core 9; corresponding to the step 13, a control groove 14 is provided on the valve hole, and the feedback oil passage 5 is connected to the control groove 14.

[0023] The piston 2 is provided with two shoulders 15, and the oil drain groove 6 is provided between the two shoulders 15. When the piston 2 moves axially, the shoulders 15 can switch the communication state of the feedback oil passage 5 with the first oil groove 4 and the oil drain groove 6 respectively.

[0024] The specific working process of the fully hydraulic variable frequency rock drill of this application is as follows: Figure 1 As shown, piston 2 retracts into cylinder 1 at the zero position. At this time, the reversing valve core 9 is in the right position. The pressure oil in the oil inlet groove 12 enters the inner cavity of the valve core and reaches the left and right end faces of the reversing valve core 9. Since the left end area of ​​the reversing valve core 9 is larger than the right end area, the pressure of the hydraulic oil pushes the reversing valve core 9 to the right. The switching groove 11 and the return groove 10 are connected. The second oil groove 7 is connected to the oil tank. The first oil groove 4 is connected to the oil inlet groove 12. The pressure oil pushes piston 2 into cylinder 1.

[0025] However, as the piston 2 retracts into the cylinder 1, the shoulder 15 opens the passage between the first oil groove 4 and the feedback oil groove. Pressurized oil with pressure reaches the first oil groove 4 through the inlet groove 12, and then enters the feedback oil groove. The hydraulic oil in the feedback oil groove finally enters the control groove 14, pushing the reversing valve core 9 to the left.

[0026] like Figure 2As shown, when the reversing valve core 9 changes from the right position to the left position under the action of hydraulic oil at step 13 and the right end face, the switching groove 11 and the oil inlet groove 12 are connected; when the piston 2 starts to rotate, the hydraulic oil in the oil inlet groove 12 enters the first oil groove 4 and the second oil groove 7 respectively, and acts on the outer side of the two shoulders 15. Since the area of ​​the right shoulder 15 connected to the second oil groove 7 is larger than the area of ​​the left shoulder 15 connected to the first oil groove 4, the hydraulic oil pushes the piston 2 out of the cylinder 1, and the piston 2 performs the rotation operation.

[0027] like Figure 3 As shown, as piston 2 extends until shoulder 15 connects feedback oil groove and drain oil groove 6, the pressure oil in feedback oil groove drains back into oil tank, and forward rotation ends. Although the pressure oil is still pushing piston 2 outward to do work at this time, the reversing valve core 9 will start to move to the right because there is no pressure in control groove 14.

[0028] like Figure 4 As shown, as the reversing valve core 9 moves to the right position, since the switching groove 11 is connected to the return oil groove 10, the hydraulic pressure in the second oil groove 7 disappears, and only the first oil groove 4 has pressurized oil, which will push the piston 2 back into the cylinder 1, and the return stroke of the piston 2 begins until the piston 2 returns to the zero position, thus completing a full working cycle.

[0029] This fully hydraulic variable frequency rock drill controls the reciprocating motion of piston 2 entirely through hydraulic means. Compared with existing rock drills, the reversing valve core 9 of this application has a hollow valve core cavity structure. It is automatically guided to both ends by pressure oil and always maintains a weak balance of hydraulic oil at both ends. The reciprocating movement of the reversing valve core 9 can be controlled by simply changing the hydraulic oil pressure in the control groove 14. This structure of valve core cavity has a small moment of inertia, the valve core reversing movement is flexible, and the response to hydraulic changes in the control groove 14 is rapid and sensitive, overcoming the problems of control lag, asynchrony and low vibration frequency of traditional rock drills.

[0030] The feedback oil passage 5 includes several control oil passages 16 arranged axially, and the control oil passages 16 are connected to the control groove 14. The axial arrangement of the control oil passages 16 can adjust the stroke of the piston 2 retraction, so as to switch between low impact energy and high frequency and high impact energy and low frequency, thus achieving the purpose of frequency conversion and adapting to different working conditions.

[0031] A guide sleeve 17 is provided at the left end of the valve hole, and the left end of the reversing valve core 9 is slidably inserted into the guide sleeve 17. The reversing valve core 9 slides back and forth within the guide sleeve 17. The guide sleeve 17 has good wear resistance and high machining precision, which can ensure that a stable and reliable oil film is formed between it and the reversing valve core 9, avoid malfunctions such as jamming of the reversing valve core 9, and improve the reliability of the reciprocating motion of the reversing valve core 9.

[0032] On the cylinder body 1, support bearings 18 and sealing caps 19 are provided at both ends of the piston 2. A sliding sealing ring is installed inside the sealing cap 19. The support bearings 18 can provide high support force to the piston 2, ensuring reliable reciprocating motion of the piston 2. The sealing caps 19 and sliding sealing rings prevent external moisture or dust from entering the piston 2 and the cylinder body 1, making it suitable for working in harsh environments and improving operational reliability.

[0033] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0034] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A full hydraulic frequency conversion rock drill comprising a cylinder (1), a piston (2) and a reversing valve (3), characterized in that: The piston (2) is slidingly inserted into the cylinder (1); a first oil groove (4), a feedback oil channel (5), a drain oil groove (6) and a second oil groove (7) are sequentially arranged on the cylinder (1) in the axial direction along the outer periphery of the piston (2), and the drain oil groove (6) is communicated with an oil tank; The reversing valve (3) comprises a reversing valve body (8) and a reversing valve core (9), the reversing valve core (9) is slidingly installed in a valve hole of the reversing valve body (8); an oil return groove (10), a switching groove (11) and an oil inlet groove (12) are sequentially arranged on the valve hole in the axial direction along the outer periphery of the reversing valve core (9), the oil inlet groove (12) is communicated with an oil inlet pipeline, and the oil return groove (10) is communicated with an oil tank; the oil inlet groove (12) is communicated with the first oil groove (4), and the switching groove (11) is communicated with the second oil groove (7), When the reversing valve core (9) is in the left position, the oil inlet groove (12) is communicated with the switching groove (11); when the reversing valve core (9) is in the right position, the switching groove (11) is communicated with the oil return groove (10); A hollow valve core inner cavity is arranged in the reversing valve core (9), the valve core inner cavity is communicated with the oil inlet groove (12), the left end surface area of the reversing valve core (9) is larger than the right end surface area, a step (13) is arranged at the right end of the reversing valve core (9), and a control groove (14) is arranged on the valve hole corresponding to the step (13), the feedback oil channel (5) is communicated with the control groove (14).

2. A full hydraulic frequency conversion rock drill as claimed in claim 1, characterized in that: Two shaft shoulders (15) are arranged on the piston (2), the drain oil groove (6) is arranged between the two shaft shoulders (15), and the shaft shoulders (15) can switch the communication state of the feedback oil channel (5) with the first oil groove (4) and the drain oil groove (6) respectively when the piston (2) moves in the axial direction.

3. A full hydraulic frequency converted rock drill as claimed in claim 2, characterized in that: The feedback oil channel (5) comprises a plurality of control oil channels (16) arranged in the axial direction, and the control oil channels (16) are respectively communicated with the control grooves (14).

4. A full hydraulic frequency converted rock drill as claimed in claim 3, characterized in that: A guide sleeve (17) is arranged at the left end of the valve hole, and the left end of the reversing valve core (9) is slidingly inserted into the guide sleeve (17).

5. A full hydraulic frequency converted rock drill as claimed in claim 4, characterized in that: Support bearings (18) and sealing covers (19) are arranged on the cylinder (1) at both ends of the piston (2), and a sliding sealing ring is installed in the sealing cover (19).

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