Self-regulating valve and rock drill

Abstract

The application provides a self-adjusting valve and a rock drill. The self-adjusting valve comprises a valve core, a first cavity and a second cavity. The valve core is provided with an adjusting channel for guiding impact oil into the rock drill. The first cavity is used for containing buffer oil discharged from the rock drill to apply a first acting force to the valve core. The second cavity is used for containing impact oil to apply a second acting force to the valve core. The first acting force is used for pushing the valve core to displace towards the second cavity to increase the oil supply flow of the adjusting channel to the rock drill. The second acting force is used for pushing the valve core to displace towards the first cavity to reduce the oil supply flow of the adjusting channel to the rock drill. When the self-adjusting valve is applied to the rock drill, the self-adjusting valve can automatically adjust the impact energy of the rock drill according to the working condition of the rock drill, reduces the manual demand in the use process of the rock drill, reduces the labor cost, and enables the rock drill to have the function of automatically adjusting the impact energy according to the working condition, and simplifies the impact energy adjusting procedure of the rock drill.

Description

Technical Field

[0001] This application relates to the field of rock drill technology, specifically to a self-regulating valve and a rock drill. Background Technology

[0002] Rock drilling rigs are widely used in various working conditions such as rock mining and tunnel excavation. As a key core component of the rig, hydraulic rock drills have become the preferred choice for rock drilling equipment due to their high efficiency and environmental friendliness, which also places higher demands on the design of rock drills. The impact system, as the direct mechanism for the energy output of the rock drill, affects the output energy characteristics of the rock drill. Generally, the higher the impact pressure, the greater the impact energy and the higher the impact frequency, and the increase in impact energy is greater than the increase in impact frequency.

[0003] In actual operation, due to the variability of rock strata, the impact pressure generally needs to be adjusted accordingly. When working on soft rock, the impact pressure needs to be appropriately reduced. On the one hand, a lower impact energy is sufficient to break the rock, eliminating the need for excessive impact energy; on the other hand, it can effectively reduce wear and tear on components. When working on hard rock, if a low impact energy is still used, the impact energy may not be able to effectively break the rock, and most of the impact energy will be rebounded back to the rock drill, affecting work efficiency and causing damage to the rock drill itself. Therefore, the impact pressure is generally increased appropriately to ensure stable impact efficiency while reducing damage to the rock drill itself, especially the buffer system, caused by rebound.

[0004] Some existing rock drills are equipped with manually adjustable valves, which allow the rock drill to have different impact capabilities. However, these valves require manual matching of the valve's settings with the rock drill's operating conditions. This places high demands on the matching personnel, requiring them to have high professional skills, thus increasing labor costs. Furthermore, adjusting the rock drill's impact energy and frequency is overly complex.

[0005] Therefore, there is room for further improvement in the impact force adjustment devices of existing rock drills. Utility Model Content

[0006] In view of this, and addressing the technical problem that existing rock drills require manual adjustment of the valve setting to match the working conditions of the rock drill, thereby manually adjusting the impact energy of the rock drill, which increases labor costs and makes adjustment overly complex, this application provides a self-regulating valve and a rock drill. The self-regulating valve is applied inside the rock drill and can automatically adjust the impact energy of the rock drill according to the working conditions of the rock drill, reducing the need for manual labor during the use of the rock drill, reducing labor costs, and enabling the rock drill to automatically adjust the impact energy according to the working conditions, thus simplifying the impact energy adjustment procedure of the rock drill.

[0007] First aspect This application provides a self-regulating valve for use in a rock drill, comprising: The valve core is equipped with an adjustment channel; the adjustment channel is used to introduce impact oil into the rock drill. The first chamber is used to contain the buffer oil flowing out of the rock drill, so as to apply the first force to the valve core; The second chamber is used to contain the impact oil to apply a second force to the valve core; The first force is used to push the valve core toward the second chamber to increase the oil supply flow of the regulating channel to the rock drill; The second force is used to push the valve core toward the first chamber to reduce the oil supply flow of the regulating channel to the rock drill.

[0008] Compared with the prior art, in the self-regulating valve of this application, the valve core is provided with a regulating channel for introducing impact oil into the rock drill. The first chamber and the second chamber are located at opposite ends of the valve core. The buffer oil of the rock drill enters the first chamber and applies a first force to the valve core; the impact oil enters the second chamber and applies a second force to the valve core. The first force and the second force are opposite in direction. When the rock drill is working on hard rock, the pressure of its rebounding buffer oil is higher. Therefore, when the pressure of the buffer oil in the first chamber is greater than the pressure of the impact oil, the first force is greater than the second force. The oil supply flow of the regulating channel to the rock drill increases, the impact oil flow into the rock drill is large, and the rock drill has high impact energy. Conversely, when the rock drill is working on soft rock, the pressure of its rebounding buffer oil is lower. When the pressure of the buffer oil in the first chamber is less than the pressure of the impact oil, the first force is less than the second force. The oil supply flow of the regulating channel to the rock drill decreases, the impact oil flow into the rock drill is small, and the impact energy of the rock drill is reduced. In other words, the valve core can be displaced under the action of the first and second forces. During the displacement process, the valve core changes the diameter of the regulating channel that allows the impact oil to flow, thereby changing the oil supply flow rate of the regulating channel to the rock drill. The flow rate of the impact oil determines the impact energy of the rock drill. Therefore, when the self-regulating valve is applied to the rock drill, it can automatically adjust the flow rate of the impact oil to the rock drill according to the working conditions of the rock drill, thereby automatically adjusting the impact energy of the rock drill to match the corresponding working conditions. This improves the convenience of controlling the impact energy of the rock drill, simplifies the control process, and eliminates the need for manual operation of the regulating valve to match the working conditions, thus reducing the manual requirements during the use of the rock drill and reducing labor costs.

[0009] Preferably, the regulating channel is open at both ends of the valve core, and the first chamber and the second chamber are located at the other two ends of the valve core; Along the direction of the impact oil inlet, the regulating channel gradually tilts towards the direction of the second chamber.

[0010] In this embodiment, the opening face of the regulating channel on the valve core is offset from the contact surfaces of the valve core and the first and second chambers to avoid interference that could affect the valve core displacement. The regulating channel is inclined towards the second chamber, so that when the impact oil flows from the inlet to the outlet of the regulating channel, the impact oil acts on the regulating channel and exerts a thrust on the valve core towards the first chamber. When the buffer oil pressure is low, the impact oil entering the regulating channel will push the valve core towards the first chamber, thereby reducing the diameter of the regulating channel that allows the impact oil to flow, thus reducing the pressure of the impact oil input to the rock drill and improving the accuracy of the self-regulating valve in automatically adjusting the impact energy of the rock drill according to the working conditions.

[0011] Preferred options also include: The valve housing has a valve cavity; the valve core is slidably disposed in the valve cavity to divide the valve cavity into a first cavity and a second cavity; The first oil passage, located on the valve body, is used to introduce buffer oil into the first chamber; The second oil passage, located on the valve body, is used to guide the impact oil into the regulating channel; The third oil passage, located on the valve body, is used to guide the impact oil in the regulating channel into the rock drill.

[0012] In this embodiment, the valve core divides the valve chamber into a first chamber and a second chamber. The valve core can move between the first chamber and the second chamber to change the size of the first chamber and the second chamber, while the sum of the volumes of the first chamber and the second chamber remains unchanged. This controls the displacement stroke of the valve core and improves the displacement sensitivity of the valve core, thereby improving the control sensitivity of the self-regulating valve.

[0013] Preferred options also include: The third cavity is located on the valve body and is arranged around the outer periphery of the valve cavity. It is connected to the second oil passage and its width is greater than the diameter of the second oil passage. The fourth chamber is located on the valve body and is arranged around the outer periphery of the valve chamber. It is connected to the third oil passage and its width is greater than the diameter of the third oil passage. In the direction of valve core displacement, the distance between the oil inlet end and the oil outlet end of the regulating channel is L1, the width of the third chamber is L2, the width of the fourth chamber is L3, the width between the third chamber and the fourth chamber is L4, and the length of the regulating channel is L5, where L1>L4, L2>L5, and L3>L5. In this embodiment, the third chamber is located between the second oil passage and the regulating channel, and its width in the valve core displacement direction is greater than the widths of the second oil passage and the regulating channel. This allows it to pressurize the impact oil and increase the speed at which the impact oil enters the regulating channel. Similarly, the fourth chamber can increase the speed at which the impact oil enters the third oil passage.

[0014] Preferred options also include: The pilot oil passage is located on the valve body, with one end connected to the third oil passage and the other end connected to the second chamber.

[0015] In this embodiment, the pilot oil passage can guide the oil from the third oil passage into the second cavity, thus playing a pilot role and ensuring the working effect of the second cavity.

[0016] Preferred options also include: The first limiting block is located on the side wall of the first cavity perpendicular to the valve core displacement direction and protrudes towards the second cavity; And / or, The second limiting block is located on the side wall of the second cavity perpendicular to the valve core displacement direction and protrudes towards the first cavity.

[0017] In this embodiment, the first limiting block and the second limiting block can prevent the valve core from sticking tightly to the side walls of the first chamber and the second chamber, so that the first chamber and the second chamber always have a certain reserved space to ensure that the first chamber and the buffer oil and the second chamber and the impact oil cooperate to generate prestress, thereby improving the response speed of the self-regulating valve, ensuring the regulation speed of the self-regulating valve, and improving the regulation effect.

[0018] Preferred options also include: The stop section is located on the valve core and inside the valve cavity; A guide hole is provided on the valve body, and its axis is parallel to the direction of valve core displacement. A guide section is located on the valve core, with one end connected to the end of the stop section near the second cavity, and the other end passing through the guide hole and located outside the valve body. The guide section is sealed to the guide hole.

[0019] In this embodiment, the guide portion can guide the displacement of the valve core, ensuring the smooth displacement of the valve core and improving the control stability of the self-regulating valve.

[0020] Preferred options also include: An elastic element, located in the first cavity, is used to apply a third force to the valve core; The third force is parallel to the first force and in the same direction as the first force.

[0021] In this embodiment, the elastic element can provide the valve core with a pre-clamping force in the same direction as the first force, increasing the threshold of the valve core displacement toward the first cavity, so that the valve core can be more stably kept in the normally open state, thereby ensuring the stability of the rock drill impact oil.

[0022] Preferred options also include: An adjusting element, connected to the valve housing, is at least partially located within the first cavity and is used to mount an elastic element; An adjustment hole, located on the valve body, is used to install adjustment components.

[0023] In this embodiment, the adjusting member can provide a stable installation position for the elastic member, so as to ensure that the elastic member can apply a stable pre-tightening force to the valve core.

[0024] Preferably, the adjusting element includes: The adjusting part is at least partially located inside the adjusting hole and at least partially located inside the first cavity, and is provided with external threads; The mounting section, located inside the first cavity, is used to mount the elastic element; The limiting part is located between the adjusting part and the mounting part, inside the first cavity, and its outer diameter is larger than the inner diameter of the adjusting hole; The adjusting hole has an internal thread.

[0025] In this embodiment, the limiting part can provide a limit for the elastic element, ensuring the stable application of the pre-tightening force of the elastic element to the valve core; while the adjusting part is threadedly connected to the adjusting hole, which can easily change the length of the adjusting part in the first cavity, thereby adjusting the magnitude of the pre-tightening force applied by the elastic element to the valve core, so as to adjust the adjusting threshold of the self-adjusting valve, thereby facilitating matching with rock drills of different specifications and improving the applicability of the self-adjusting valve.

[0026] Secondly, this application provides a rock drill, including the self-regulating valve in any embodiment provided in the first aspect. The self-regulating valve is coaxially arranged with the rock drill piston, the rock drill's buffer system is connected to the first chamber, and the self-regulating valve is used to guide impact oil into the rock drill's impact system.

[0027] Compared with the prior art, the self-regulating valve in the rock drill of this application is connected to both the buffer system and the impact system of the rock drill. The self-regulating valve can automatically adjust the flow rate of the impact oil input to the impact system according to the pressure of the buffer oil fed back by the buffer system. This enables the rock drill to automatically adjust the impact energy to match the current working conditions, which can reduce energy waste and reduce the damage to the rock drill caused by inappropriate rebound. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of a rock drill provided in one embodiment of this application; Figure 2 This is a schematic cross-sectional view of a self-regulating valve provided in one embodiment of this application. Figure 1 ; Figure 3 This is a schematic cross-sectional view of a self-regulating valve provided in one embodiment of this application. Figure 2 ; Figure 4 This is a cross-sectional structural diagram of a valve housing provided in an embodiment of this application; Figure 5 yes Figure 3 A magnified view of part A.

[0029] Reference numerals: 1. Self-regulating valve; 2. Piston; 3. Buffer system; 4. Impact system; 11. Valve core; 12. Valve housing; 13. Elastic element; 14. Adjusting element; 111. Adjustment channel; 112. Guide section; 113. Stop section; 114. First limit block; 115. Second limit block; 121. Valve chamber; 122. Third chamber; 123. Fourth chamber; 124. First oil passage; 125. Second oil passage; 126. Third oil passage; 127. Pilot oil passage; 128. Adjustment hole; 129. Guide hole; 1211, First cavity; 1212, Second cavity; 141. Adjustment part; 142. Mounting part; 143. Limiting part. Detailed Implementation

[0030] To enable those skilled in the art to better understand the technical solutions of this disclosure, the following detailed, clear, and complete description of this disclosure is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this disclosure and are not intended to limit it.

[0031] In the description of this application, the use of "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0032] Those skilled in the art should understand that in the disclosure of this application, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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. Therefore, the above terms should not be construed as limitations on this application.

[0033] The present application will now be described in further detail with reference to the accompanying drawings, see below. Figures 1 to 5 illustrate.

[0034] First aspect This application provides a self-regulating valve 1, which is applied in rock drilling equipment to automatically regulate the impact energy of the rock drill.

[0035] Specifically, such as Figures 1 to 5As shown, the self-regulating valve 1 includes a valve housing 12 and a valve core 11. The valve housing 12 has a valve cavity 121, and the valve core 11 is disposed within the valve cavity 121. The length of the valve cavity 121 is greater than that of the valve core 11, thereby enabling the valve core 11 to divide the valve cavity 121 into two relatively isolated chambers, namely a first chamber 1211 and a second chamber 1212. The first chamber 1211 and the second chamber 1212 are located on opposite sides of the valve core 11, and the valve core 11 can move within the valve cavity 121, thereby changing the size of the first chamber 1211 and the second chamber 1212. The valve core 11 also has an adjusting channel 111. The regulating channel 111 is connected to the impact system 4 of the rock drill. The regulating channel 111 is used to allow impact oil to flow through, that is, the impact oil enters the impact system 4 of the rock drill through the regulating channel 111. The first chamber 1211 is connected to the buffer system 3 of the rock drill. The buffer oil in the buffer system 3 of the rock drill can enter the first chamber 1211 and then apply a first force to the valve core 11 to push the valve core 11 to move towards the second chamber 1212. The impact oil can enter the second chamber 1212 and apply a second force to the valve core 11 to push the valve core 11 to move towards the first chamber 1211.

[0036] Therefore, when the rock drill is operating in hard rock, the pressure of its rebounding buffer oil is relatively high. When the pressure of the buffer oil in the first chamber 1211 is greater than the pressure of the impact oil, the first force is greater than the second force. This increases the oil supply flow rate of the regulating channel 111 to the rock drill, resulting in a large flow rate of impact oil entering the rock drill, and the rock drill possesses high impact energy. Conversely, when the rock drill is operating in soft rock, the pressure of its rebounding buffer oil is relatively low. Therefore, when the pressure of the buffer oil in the first chamber 1211 is less than the pressure of the impact oil, the first force is less than the second force. This decreases the oil supply flow rate of the regulating channel 111 to the rock drill, resulting in a small flow rate of impact oil entering the rock drill, and the rock drill possesses reduced impact energy. That is, the valve core 11, in terms of the first force and the second force... Under the action of force, the valve core 11 can make corresponding displacement. During the displacement process, the valve core 11 will change the diameter of the regulating channel 111 that can supply impact oil, thereby changing the oil supply flow rate of the regulating channel 111 to the rock drill. The flow rate of impact oil determines the impact energy of the rock drill. Therefore, when the self-regulating valve 1 is applied in the rock drill, it can automatically adjust the flow rate of impact oil to the rock drill according to the working conditions of the rock drill, thereby automatically adjusting the impact energy of the rock drill to match the corresponding working conditions. This improves the convenience of controlling the impact energy of the rock drill, simplifies the control process, and eliminates the need for manual operation of the regulating valve to match the working conditions, thereby reducing the manual requirements during the use of the rock drill and reducing labor costs.

[0037] Furthermore, the self-regulating valve 1 is described in more detail; such as Figure 2 , Figure 3As shown, with the displacement direction of valve core 11 as the X-axis, the impact oil is displaced approximately along the Y-axis, which is perpendicular to the Y-axis. In the Y-axis direction, the upper and lower sidewalls of valve core 11 are almost tightly fitted with the sidewall of valve cavity 121, thereby reducing the probability of oil in the first cavity 1211 and the second cavity 1212 passing between valve core 11 and the sidewall of valve cavity 121, and ensuring the effectiveness of the force exerted by the oil in the first cavity 1211 and the second cavity 1212 on valve core 11.

[0038] Among them, such as Figure 2 , Figure 3 As shown, the regulating channel 111 has openings on the upper and lower end faces of the valve core 11. The first chamber 1211 and the second chamber 1212 are located on the left and right sides of the valve core 11, respectively. This allows the oil inlet and outlet of the regulating channel 111, the first chamber 1211, and the second chamber 1212 to be located on different sides of the valve core 11, avoiding interference between them and ensuring the effectiveness of the operation of the regulating channel 111, the first chamber 1211, and the second chamber 1212.

[0039] And, as Figure 2 , Figure 3As shown, the adjustment channel 111 is inclined to the Y-axis, and the angle θ between the axis of the adjustment channel 111 and the Y-axis is an acute angle, and 20°≤θ≤40°. θ can be set to any one of 20°, 25°, 30°, 35°, and 40°. In this embodiment, θ is preferably 25°. In this embodiment, the oil inlet of the regulating channel 111 is located at the lower end of the valve core 11, and the oil outlet of the regulating channel 111 is located at the upper end of the valve core 11. The regulating channel 111 is inclined towards the second cavity 1212, so that the distance between the oil outlet of the regulating channel 111 and the second cavity 1212 in the X-axis direction is short. Therefore, when the impact oil enters the regulating channel 111 along the Y-axis, there is an angle between the impact oil and the side wall of the regulating channel 111. After the pressure of the impact oil is decomposed in the regulating channel 111, it can generate a fourth force on the valve core 11. The fourth force is in the same direction and parallel to the second force, and the valve core 11 can be pushed to move towards the first cavity 1211. Therefore, due to the structural characteristics of the regulating channel 111, the valve core 11 of the self-regulating valve 1 automatically moves towards the first cavity 1211 during use. The displacement trend, i.e., the self-regulating valve 1 has the tendency to automatically reduce the oil supply to the rock drill, has the advantage of making full use of the feedback effect of the buffer oil. When the buffer oil pressure is low, the first force is small, while the second and fourth forces are large. This indicates that the rock drill is operating in a softer rock layer and does not require excessive impact energy. Therefore, the sum of the second and fourth forces is greater than the first force. Consequently, under the action of the second and fourth forces, the valve core 11 displaces towards the first chamber 1211, reducing the diameter of the regulating channel 111 that can supply impact oil. This reduces the oil supply flow of the self-regulating valve 1 to the rock drill. The displacement of the valve core 11 (i.e., the diameter of the regulating channel 111 that can supply impact oil) is determined by the relationship between the sum of the second and fourth forces and the first force.

[0040] Therefore, in this embodiment, with the combined cooperation of the adjustment channel 111, the first chamber 1211, and the second chamber 1212, the adjustment accuracy of the self-adjusting valve 1 in automatically adjusting the rock drill impact energy according to the working conditions is further increased, thus further ensuring the effectiveness of the adjustment.

[0041] Furthermore, such as Figures 2 to 4As shown, the valve housing 12 is also provided with a first oil passage 124, a second oil passage 125, and a third oil passage 126, and the first oil passage 124, the second oil passage 125, and the third oil passage 126 all open on the side wall of the valve cavity 121; the first oil passage 124 is located on the left side of the valve housing 12, and its axis is parallel to the X-axis direction. It is used to guide the buffer oil of the rock drill into the first cavity 1211, and the flow direction of the buffer oil is the same as that of the first force, thereby ensuring the effectiveness of the first force generated by the buffer oil; the second oil passage 125 and the third oil passage 126 are respectively located on the upper side of the valve housing 12. At the lower end, the second oil passage 125 and the third oil passage 126 are arranged parallel to the Y-axis. The second oil passage 125 and the third oil passage 126 are spaced apart in the X-axis direction. The distance between the third oil passage 126 and the second cavity 1212 on the X-axis is greater than the distance between the second oil passage 125 and the second cavity 1212 on the X-axis. The second oil passage 125 can be connected to the oil inlet end of the regulating channel 111 to introduce the impact oil into the regulating channel 111. The third oil passage 126 can be connected to the oil outlet end of the regulating channel 111 to introduce the impact oil in the regulating channel 111 into the rock drill.

[0042] Among them, the lengths of the second oil passage 125 and the third oil passage 126 on the X-axis are greater than the length of the regulating channel 111. With the central axis of the regulating channel 111, the lengths of the oil inlet and outlet ends of the regulating channel 111 on the X-axis are less than the lengths of the second oil passage 125 and the third oil passage 126 on the X-axis. This ensures the effectiveness of the oil inlet and outlet ends of the regulating channel 111 in communicating with the second oil passage 125 and the third oil passage 126 respectively, and improves the regulating range of the self-regulating valve 1.

[0043] Among them, such as Figures 2 to 4 As shown, the valve housing 12 is also provided with a pilot oil passage 127. One end of the pilot oil passage 127 is connected to the side wall of the third oil passage 126 near the first cavity 1211, and the other end opens on the side wall end face of the second cavity 1212 parallel to the Y axis, so that the impact oil in the third oil passage 126 can be introduced into the second cavity 1212. When the self-regulating valve 1 is filled with oil, the pilot oil passage 127 can introduce the oil in the third oil passage 126 into the second cavity 1212, playing a pilot role, so that the impact oil in the second cavity 1212 can generate force in time, so as to ensure the effectiveness and accuracy of the second force, thereby ensuring the adjustment accuracy of the self-regulating valve 1.

[0044] Furthermore, such as Figures 2 to 4As shown, the valve chamber 121 of the self-regulating valve 1 is also provided with a first limiting block 114. The first limiting block 114 is located on the side wall of the first chamber 1211 parallel to the Y-axis, and the first limiting block 114 protrudes along the X-axis toward the second chamber 1212, thereby limiting the valve core 11 in the X-axis direction. When the valve core 11 moves close to the side wall of the first chamber 1211, it will be limited by the first limiting block 114, thereby preventing the valve core 11 from sticking tightly to the side wall of the first chamber 1211 under the action of oil. On the one hand, it can prevent the valve core 11 from sticking, thereby ensuring the sensitivity of the valve core 11. On the other hand, it ensures that the first chamber 1211 always has a certain reserved space, so that the first chamber 1211 can generate prestress under the cooperation of buffer oil, thereby improving the response speed of the self-regulating valve 1, ensuring the regulation speed of the self-regulating valve 1, and improving the regulation effect.

[0045] In this embodiment, the first limiting block 114 can be a block-shaped protrusion, an annular protrusion, or can be located at any position on the side wall of the first cavity 1211 parallel to the Y-axis. In this embodiment, the first limiting block 114 is preferably provided with an annular protrusion and is located near the edge of the side wall of the first cavity 1211 parallel to the Y-axis.

[0046] Furthermore, in another optional embodiment of this application, such as Figures 2 to 4 As shown, a second limiting block 115 is also provided in the valve chamber 121 of the self-regulating valve 1. The second limiting block 115 is located on the side wall of the second chamber 1212 parallel to the Y-axis and protrudes towards the first chamber 1211. In this embodiment, the structure of the second limiting block 115 is the same as that of the first limiting block 114, the principle of its setting position is the same, and the principle of its action on the valve core 11 in the second chamber 1212 is the same, which will not be described in detail here.

[0047] Furthermore, in an optional embodiment of this application, such as Figures 2 to 4As shown, the valve housing 12 is also provided with a third cavity 122 and a fourth cavity 123. Both the third cavity 122 and the fourth cavity 123 are annular structures, and are arranged around the outer periphery of the valve cavity 121. The inner sides of the third cavity 122 and the fourth cavity 123 are connected to the outer side of the valve cavity 121, so that the third cavity 122 and the fourth cavity 123 are in communication with the valve cavity 121. Among them, the outer side of the third cavity 122 is in communication with the second oil passage 125, that is, the third cavity 122 is located between the valve cavity 121 and the second oil passage 125. Between them, the third chamber 122 and the second oil passage 125 are on the same straight line parallel to the center line of the Y-axis. The impact oil flows into the third chamber 122 through the second oil passage 125, and then into the regulating channel 111 of the valve core 11 through the third chamber 122. Similarly, the regulating channel 111 is connected to the third oil passage 126 through the fourth chamber 123. The fourth chamber 123 and the third oil passage 126 are on the same straight line parallel to the center line of the Y-axis. The impact oil in the regulating oil passage enters the third oil passage 126 through the fourth chamber 123.

[0048] Among them, such as Figure 2 , Figure 4 As shown, in the X-axis direction, the distance between the oil inlet and outlet of the adjusting channel 111 is L1, the width of the third chamber 122 is L2, the width of the fourth chamber 123 is L3, the width between the third chamber 122 and the fourth chamber 123 is L4, and the length of the adjusting channel 111 is L5, where L1>L4, L2>L5, and L3>L5. The width of the third chamber 122 is also greater than the width of both the adjusting channel 111 and the second oil passage 125. When the impact oil flows from the second oil passage 125 into the third chamber 122, it will affect the impact oil... It has a pressurizing effect. When the impact oil in the third chamber 122 enters the regulating channel 111, it will increase the speed at which the impact oil enters the regulating channel 111. Similarly, the width of the fourth chamber 123 is greater than the width of the regulating channel 111 and the third oil passage 126. When the impact oil enters the fourth chamber 123 from the regulating channel 111, it will have a pressurizing effect on the impact oil. When the impact oil in the fourth chamber 123 enters the third oil passage 126, it will increase the speed at which the impact oil enters the third oil passage 126, thus accelerating the speed at which the impact oil enters the rock drill.

[0049] When L1>L4, L1 includes the maximum and minimum lengths between the oil inlet and outlet of the regulating oil passage, and L4 includes the maximum and minimum lengths between the third chamber 122 and the fourth chamber 123, where L1max>L4max and L1min>L4min; thereby enabling the oil inlet and outlet of the regulating channel 111 to be precisely aligned with the third chamber 122 and the fourth chamber 123 respectively, thus ensuring the normal operation of the self-regulating valve 1 in supplying oil to the rock drill.

[0050] It should be noted that the size of the flow port of the regulating channel 111 for the impact oil in this application refers to the size of the area where the regulating channel 111 is directly connected to the second oil passage 125 or the second oil passage 125. Figure 2 As shown, the valve core 11 moves toward the first chamber 1211, and the area of ​​the adjustment channel 111 and the third chamber 122 directly connected on the X-axis is reduced. As a result, the diameter of the oil flowing from the second oil passage 125 into the adjustment channel 111 through the third chamber 122 is directly reduced, the flow rate of the impact oil entering the adjustment channel 111 is reduced, and the flow rate of the impact oil flowing from the self-regulating valve 1 into the rock drill is naturally reduced, thereby reducing the impact energy of the rock drill.

[0051] Furthermore, the valve core 11 is further expanded; such as... Figures 2 to 4 As shown, the valve housing 12 is provided with a guide hole 129, which is located on the right side of the valve housing 12. The guide hole 129 passes through the valve housing 12 parallel to the X-axis, and the axis of the guide hole 129 is on the same straight line as the axis of the valve cavity 121. The valve core 11 includes a stop part 113 and a guide part 112. The right end face of the stop part 113 is connected to the guide part 112. The stop part 113 is located inside the valve cavity 121, and the regulating channel 111 is provided on the stop part 113. The stop part 113 has the function of preventing the oil from flowing between the first cavity 1211 and the second cavity 1212. The end of the guide part 112 away from the stop part 113 passes through the guide hole 129 and is at least partially located outside the valve housing 12; that is, the guide part 112 is at least partially located outside the valve housing 12. Within the valve cavity 121, at least a portion of the guide portion 112 is located within the guide hole 129, and at least a portion is located outside the valve housing 12. That is, the length of the guide portion 112 is greater than the difference in length between the valve cavity 121 and the stop portion 113. This ensures that during the displacement of the valve core 11 along the X-axis, the guide portion 112 is always at least partially located within the guide hole 129. The guide portion 112 can guide the displacement of the valve core 11, ensuring the smooth displacement of the valve core 11 and improving the control stability of the self-regulating valve 1. The guide portion 112 is sealed to the guide hole 129, which can prevent oil leakage from the connection between the guide portion 112 and the guide hole 129, thereby ensuring the accuracy of the self-regulating valve 1 in automatically adjusting the flow rate of the impact oil supplied to the rock drill according to the working conditions of the rock drill.

[0052] Furthermore, due to the arrangement of the guide part 112, the area A2 of the oil in the second chamber 1212 acting on the valve core 11 is smaller than the area A1 of the oil in the first chamber 1211 acting on the valve core 11. Consequently, the buffer oil responds to the valve core 11 more quickly. When the working condition of the rock drill changes from soft rock to hard rock, the self-regulating valve 1 can quickly increase the flow rate under the action of the buffer oil, so that the rock drill can quickly increase the impact energy and improve the working efficiency.

[0053] Based on any of the above embodiments, the self-regulating valve 1 can be further extended; such as... Figures 3 to 5As shown, in this embodiment, the self-regulating valve 1 includes an elastic element 13, which is disposed in the first cavity 1211. The elastic element 13 is used to apply a third force to the valve core 11. The third force is parallel to the first force and in the same direction as the first force. In the normal state, the elastic element 13 is compressed in the initial state in the valve cavity 121, so that the elastic element 13 always provides a third force to the valve core 11. Under the action of the third force, the valve core 11 is displaced to the left to reduce the increase of the output flow threshold of the self-regulating valve 1, so that the valve core 11 can be kept in the normally open state relatively stably, thereby stably supplying oil to the rock drill.

[0054] Among them, such as Figures 3 to 5 As shown, the self-regulating valve 1 also includes an adjusting member 14. The valve housing 12 has an adjusting hole 128 for mounting the adjusting member 14. The adjusting hole 128 is located on the left side of the valve housing 12 and extends through the valve housing 12 parallel to the X-axis. The axis of the adjusting hole 128 is on the same straight line as the axis of the valve cavity 121. The adjusting member 14 includes an adjusting part 141, a mounting part 142, and a limiting part 143. The adjusting part 141, the limiting part 143, and the mounting part 142 are connected sequentially along the X-axis. The adjusting part 141 is at least partially located within the adjusting hole 128, with its two ends located outside the valve housing 12 and inside the valve cavity 121, respectively. The outer diameter of the limiting part 143 is larger than the diameter of the adjusting hole 128 and also larger than the outer diameter of the mounting part 142. Figure 5 As shown, the elastic element 13 is sleeved on the mounting part 142, and the end of the elastic element 13 away from the valve core 11 abuts against the limiting part 143, so that the displacement of the elastic element 13 on the X-axis can be limited, so that the elastic element 13 can provide a stable third force to the valve core 11, thereby ensuring the normally open state of the self-regulating valve 1, and thus stably supplying oil to the rock drill.

[0055] In this embodiment, the elastic element 13 is a spring.

[0056] Furthermore, such as Figure 5 As shown, the adjusting part 141 is provided with an external thread, and the adjusting hole 128 is provided with an internal thread, so that the adjusting part 14 and the valve body 12 are threadedly connected. This allows the operator to easily adjust the length of the adjusting part 14 extending into the valve cavity 121, thereby adjusting the magnitude of the third force applied by the elastic element 13 to the valve core 11, and adjusting the closing threshold of the self-adjusting valve 1. This facilitates matching with rock drills of different specifications and improves the applicability of the self-adjusting valve 1.

[0057] Second aspect This application provides a rock drill, including the self-regulating valve 1 in any embodiment provided in the first aspect.

[0058] like Figure 1As shown, the self-regulating valve 1 is coaxially arranged with the rock drill piston 2. The rock drill's buffer system 3 is connected to the first chamber 1211. The self-regulating valve 1 is used to guide the impact oil to the rock drill's impact system 4. The self-regulating valve 1 can automatically adjust the flow rate of the impact oil input to the impact system 4 according to the pressure of the buffer oil fed back by the buffer system 3. This enables the rock drill to automatically adjust the impact energy to match the current working conditions, which can reduce energy waste, reduce damage to the rock drill caused by inappropriate rebound, ensure the working efficiency of the rock drill, and extend its service life.

[0059] It should be noted that the various embodiments of this application can be arbitrarily combined to form new embodiments, provided that the solutions do not conflict and the technical solutions can coexist.

[0060] The present application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present application. The descriptions of the embodiments above are only for the purpose of helping to understand the present application and its core ideas. It should be noted that those skilled in the art can make several improvements and modifications to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A self-regulating valve, applied to a rock drill, characterized in that, include: The valve core (11) is provided with an adjustment channel (111); the adjustment channel (111) is used to introduce impact oil into the rock drill. The first chamber (1211) is used to contain the buffer oil flowing out of the rock drill to apply the first force to the valve core (11); The second chamber (1212) is used to contain impact oil to apply a second force to the valve core (11); The first force is used to push the valve core (11) to move toward the second chamber (1212) to increase the oil supply flow of the regulating channel (111) to the rock drill; The second force is used to push the valve core (11) to move toward the first chamber (1211) to reduce the oil supply flow of the regulating channel (111) to the rock drill.

2. The self-regulating valve according to claim 1, characterized in that, The regulating channel (111) is open at opposite end faces of the valve core (11), and the first cavity (1211) and the second cavity (1212) are located at the other opposite ends of the valve core (11); Along the oil inlet direction of the impact oil, the regulating channel (111) gradually tilts toward the direction of the second chamber (1212).

3. The self-regulating valve according to claim 2, characterized in that, Also includes: The valve housing (12) has a valve cavity (121); the valve core (11) is slidably disposed in the valve cavity (121) to divide the valve cavity (121) into a first cavity (1211) and a second cavity (1212). The first oil passage (124) is located on the valve body (12) and is used to introduce buffer oil into the first chamber (1211); The second oil passage (125) is located on the valve body (12) and is used to guide the impact oil into the regulating passage (111); The third oil passage (126) is located on the valve body (12) and is used to introduce the impact oil in the regulating channel (111) into the rock drill.

4. The self-regulating valve according to claim 3, characterized in that, Also includes: The third cavity (122) is located on the valve body (12) and is arranged around the outer periphery of the valve cavity (121). It is connected to the second oil passage (125) and its width is greater than the diameter of the second oil passage (125). The fourth cavity (123) is located on the valve body (12) and is arranged around the outer periphery of the valve cavity (121). It is connected to the third oil passage (126) and its width is greater than the diameter of the third oil passage (126). In the displacement direction of the valve core (11), the distance between the oil inlet end and the oil outlet end of the regulating channel (111) is L1, the width of the third chamber (122) is L2, the width of the fourth chamber (123) is L3, the width between the third chamber (122) and the fourth chamber (123) is L4, and the length of the regulating channel (111) is L5, wherein L1>L4, L2>L5, and L3>L5; And / or, The pilot oil passage (127) is located on the valve body (12), with one end connected to the third oil passage (126) and the other end connected to the second chamber (1212).

5. The self-regulating valve according to claim 1, characterized in that, Also includes: The first limiting block (114) is located on the side wall of the first cavity (1211) perpendicular to the displacement direction of the valve core (11) and protrudes toward the second cavity (1212); And / or, The second limiting block (115) is located on the side wall of the second cavity (1212) perpendicular to the displacement direction of the valve core (11) and protrudes toward the first cavity (1211).

6. The self-regulating valve according to claim 3, characterized in that, Also includes: The stop part (113) is provided on the valve core (11) and located inside the valve cavity (121); A guide hole (129) is provided on the valve body (12), and its axis is parallel to the displacement direction of the valve core (11); The guide part (112) is provided on the valve core (11), one end of which is connected to the end of the stop part (113) near the second cavity (1212), and the other end passes through the guide hole (129) and is located outside the valve body (12); The guide portion (112) is sealed to the guide hole (129).

7. The self-regulating valve according to any one of claims 1 to 6, characterized in that, Also includes: An elastic element (13) is disposed in the first cavity (1211) and is used to apply a third force to the valve core (11); The third force is parallel to the first force and in the same direction as the first force.

8. The self-regulating valve according to claim 7, characterized in that, Also includes: Adjusting element (14), connected to valve housing (12), is located at least partially within first cavity (1211) for mounting elastic element (13). An adjustment hole (128) is provided on the valve body (12) for installing an adjustment component (14).

9. The self-regulating valve according to claim 8, characterized in that, The adjusting member (14) includes: The adjustment part (141) is at least partially located in the adjustment hole (128) and at least partially located in the first cavity (1211), and is provided with external threads; The mounting part (142) is located in the first cavity (1211) and is used to install the elastic element (13). The limiting part (143) is located between the adjusting part (141) and the mounting part (142), inside the first cavity (1211), and its outer diameter is larger than the inner diameter of the adjusting hole (128); The adjusting hole (128) is provided with an internal thread.

10. A rock drill, comprising a self-regulating valve as described in any one of claims 1 to 9, characterized in that, The self-regulating valve (1) is coaxially arranged with the rock drill piston (2), the rock drill buffer system (3) is connected to the first chamber (1211), and the self-regulating valve (1) is used to guide the impact oil to the rock drill impact system (4).

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