Reversing valve and hydraulic breaking hammer

Abstract

The utility model belongs to the technical field of hydraulic devices, and provides a reversing valve and a hydraulic breaking hammer, the reversing valve comprises a fixed part and a movable part arranged in the fixed part in a sliding mode, and the fixed part and the movable part are matched to form a high-pressure cavity, a pressure relief cavity and a signal cavity. The signal cavity is arranged between the high-pressure cavity and the pressure relief cavity, a low-pressure stabilizing hole channel and a high-pressure stabilizing hole channel are formed in the movable part, and the two ends of the low-pressure stabilizing hole channel are suitable for being communicated with the signal cavity and the pressure relief cavity respectively when the movable part is located at the lower position. The two ends of the high-pressure stabilizing hole channel are suitable for being communicated with the signal cavity and the high-pressure cavity respectively when the movable part is located at the upper position. The hydraulic breaking hammer provided by the utility model comprises the reversing valve. According to the reversing valve and the hydraulic breaking hammer, the probability that the surface of a movable part of the reversing valve is scratched is effectively reduced, and the service life of a workpiece is effectively prolonged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of hydraulic devices, and particularly relates to a reversing valve and hydraulic breaking hammer. BACKGROUND

[0002] The hydraulic breaking hammer is also called breaking hammer, which is usually installed at the position of the installed bucket or loading bucket of the excavator or loading machine, and is mainly used for breaking, demolishing and excavating hard layer in construction, and has the advantages of large impact force, convenient use, good mobility and high efficiency.

[0003] The existing breaking hammer generally comprises a cylinder body, a drill rod, a piston and a hydraulic system, the drill rod and the piston are both slidingly arranged in the cylinder body, the hydraulic system drives the piston to reciprocate along the axial direction of the cylinder body, so that the piston continuously strikes the drill rod. The hydraulic system mainly comprises an oil pump, a hydraulic pipeline and a reversing valve, the reversing valve is a core component of the hydraulic system and controls the flow direction of the hydraulic oil in the hydraulic system.

[0004] The reversing valve is usually composed of a fixed component and a movable component, the fixed component is usually a valve body and part of it also comprises a valve core, the movable component is usually a valve sleeve and part of it is a valve core. The fixed component and the movable component cooperate to form a high-pressure cavity, a pressure relief cavity and a signal cavity, the high-pressure cavity is communicated with a high-pressure oil path through a high-pressure hole, the pressure relief cavity is communicated with a return oil path through a return oil hole, the signal cavity is communicated with the cylinder body through a signal hole, the movable component is provided with a first stress surface and a first equalizing groove in the high-pressure cavity along the sliding direction, is provided with a second stress surface and a second equalizing groove in the signal cavity, the first stress surface, the second stress surface, the first equalizing groove and the second equalizing groove are all annular, the side surface of the first equalizing groove is flush with the first stress surface, the side surface of the second equalizing groove is flush with the second stress surface, and the area of the second stress surface is greater than that of the first stress surface; as the position of the piston in the cylinder body changes, the signal cavity is communicated with the high-pressure oil path or the return oil path, thereby driving the movable component to slide relative to the fixed component to complete the reversing operation.

[0005] Specifically, the movable component moves to the side of the high-pressure cavity away from the low-pressure cavity and abuts against the fixed component, which is called that the movable component is in the upper position, the signal cavity is communicated with the return oil path, the signal cavity is in a low-pressure state, the pressure on the second stress surface is less than that on the first stress surface, so that the movable component moves to the side of the pressure relief cavity and abuts against the fixed component, which is called that the movable component is in the lower position, and the reversing valve completes a reversing operation to drive the piston in the cylinder body to move; after the piston is moved to the position, the signal cavity is communicated with the high-pressure oil path, the signal cavity is in a high-pressure state and the pressure in the signal cavity is equal to that in the high-pressure cavity, and since the area of the second stress surface is greater than that of the first stress surface, the movable component moves from the lower position to the upper position to complete a reversing operation again to drive the piston in the cylinder body to move reversely, and thus the cycle is repeated.

[0006] Because the fit between the stationary and moving parts of a directional control valve is typically a clearance fit, an oil film forms within the clearance for lubrication. Therefore, oil leakage can occur between the signal chamber and the pressure relief and high-pressure chambers, causing pressure instability in the signal chamber and affecting the normal operation of the directional control valve. Therefore, pressure-stabilizing grooves are usually created on the surface of the moving parts, such as... Figures 1 to 2 As shown, when the moving part is in the lower position, the signal cavity is connected to the pressure relief cavity through the voltage stabilizing groove; when the moving part is in the upper position, the signal cavity is connected to the high-pressure cavity through the voltage stabilizing groove.

[0007] However, during use, it was found that the surface of the components near the pressure stabilizing groove is prone to roughening. After research and analysis, it may be because the pressure stabilizing groove is opened on the outer side of the moving component, and the processing area on the outer side of the moving component is large. During processing, it causes local deformation of the moving component, which can easily cause uneven radial force and circumferential oil pressure imbalance when the moving component slides. Alternatively, the groove on the surface may create more sharp edges, which can ultimately cause the surface of the component to be prone to roughening, affecting the service life of the workpiece. Utility Model Content

[0008] This utility model provides a reversing valve and a hydraulic breaker, aiming to solve the technical problems described in the background art.

[0009] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0010] In a first aspect, this utility model provides a reversing valve, including a fixed component and a movable component slidably disposed within the fixed component. The fixed component and the movable component cooperate to form a high-pressure chamber, a pressure relief chamber, and a signal chamber. The signal chamber is disposed between the high-pressure chamber and the pressure relief chamber. The high-pressure chamber is connected to a high-pressure oil circuit through a high-pressure channel, the pressure relief chamber is connected to a return oil circuit through a return oil channel, and the signal chamber is connected to the cylinder block through a signal channel. The movable component has a first force-bearing surface and a first pressure-equalizing groove in the high-pressure chamber along the sliding direction, and a second force-bearing surface and a second pressure-equalizing groove in the signal chamber. The first force-bearing surface, the second force-bearing surface, the first pressure-equalizing groove and the second pressure-equalizing groove are all annular. One side of the first pressure-equalizing groove is flush with the first force-bearing surface, and one side of the second pressure-equalizing groove is flush with the second force-bearing surface. The area of ​​the second force-bearing surface is larger than the area of ​​the first force-bearing surface. As the piston changes position in the cylinder, the signal chamber is connected to the high-pressure oil circuit or the return oil circuit, thereby driving the movable component to slide relative to the fixed component to complete the reversing operation.

[0011] Specifically, the movable part moves towards the side of the high-pressure chamber away from the low-pressure chamber until it abuts against the fixed part. This is called the upper position of the movable part. The signal chamber is connected to the return oil circuit and is in a low-pressure state. The pressure on the second force surface is less than the pressure on the first force surface, causing the movable part to move towards the side where the pressure relief chamber is located until it abuts against the fixed part. This is called the lower position of the movable part. The reversing valve completes one reversal, driving the piston in the cylinder to move. After the piston moves to the position, it will connect the signal chamber to the high-pressure oil circuit. The signal chamber is in a high-pressure state and the pressure is equal to that of the high-pressure chamber. Since the area of ​​the second force surface is larger than that of the first force surface, the movable part will move from the lower position to the upper position, completing another reversal and driving the piston in the cylinder to move in the opposite direction. This cycle repeats continuously.

[0012] The movable component has a low-pressure stabilizing channel and a high-pressure stabilizing channel. The two ends of the low-pressure stabilizing channel are adapted to communicate with the signal cavity and the pressure relief cavity respectively when the movable component is in the lower position. The two ends of the high-pressure stabilizing channel are adapted to communicate with the signal cavity and the high-pressure cavity respectively when the movable component is in the upper position.

[0013] Specifically, the openings of the low-voltage stabilizing channel and the high-voltage stabilizing channel are located on the side of the moving part, and one of the openings is always connected to the signal cavity. When the moving part is in the lower position, the other opening of the low-voltage stabilizing channel is connected to the pressure relief cavity, and the other opening of the high-voltage stabilizing channel is connected to the signal cavity or blocked by the fixed part, thus isolating it from the high-voltage cavity. When the moving part is in the upper position, the other opening of the low-voltage stabilizing channel is connected to the signal cavity or blocked by the fixed part, thus isolating it from the pressure relief cavity, and the other opening of the high-voltage stabilizing channel is connected to the high-voltage cavity.

[0014] In conjunction with the first aspect, in one possible implementation of the reversing valve provided by this utility model, the fixed component includes a valve body and a valve core, the valve core is fixedly disposed in the valve body, the movable component is a valve sleeve, the valve sleeve is slidably disposed on the valve core, and has the degree of freedom to slide along the axial direction of the valve core; the valve sleeve is provided with the low-pressure stabilizing channel and the high-pressure stabilizing channel.

[0015] In conjunction with the first aspect, in one possible implementation of the reversing valve provided by this utility model, the valve sleeve is provided with a pressure-stabilizing main channel, a low-pressure branch channel, a signal branch channel, and a high-pressure branch channel. The low-pressure branch channel, the signal branch channel, and the high-pressure branch channel are all connected to the pressure-stabilizing main channel. The low-pressure branch channel is adapted to communicate with the pressure relief chamber when the valve sleeve is in the lower position. The pressure-stabilizing main channel, the low-pressure branch channel, and the signal branch channel constitute the low-pressure stabilizing channel. The high-pressure branch channel is adapted to communicate with the high-pressure chamber when the valve sleeve is in the upper position. The pressure-stabilizing main channel, the signal branch channel, and the high-pressure branch channel constitute the high-pressure stabilizing channel.

[0016] In conjunction with the first aspect, in one possible implementation of the reversing valve provided by this utility model, the main pressure stabilizing channel is opened along the axial direction of the valve sleeve and is closed at both ends. The low-pressure branch channel, the signal branch channel, and the high-pressure branch channel are all opened radially along the valve sleeve, with one end connected to the main pressure stabilizing channel and the other end connected to the outer wall of the valve sleeve.

[0017] In conjunction with the first aspect, in one possible implementation of the reversing valve provided by this utility model, a plurality of sets of the main pressure stabilizing channel, the low-pressure branch channel, the signal branch channel, and the high-pressure branch channel are provided along the circumference of the valve sleeve; a low-pressure equalizing groove, a signal equalizing groove, and a high-pressure equalizing groove are provided on the outer wall of the valve sleeve, the low-pressure equalizing groove is connected to the low-pressure branch channel, the signal equalizing groove is connected to the signal branch channel, and the high-pressure equalizing groove is connected to the high-pressure branch channel.

[0018] In conjunction with the first aspect, in one possible implementation of the reversing valve provided by this utility model, the fixed component is a valve body, the movable component is a valve core, the valve core is slidably disposed in the valve body, and the valve core is provided with the low-pressure stabilizing channel and the high-pressure stabilizing channel.

[0019] In conjunction with the first aspect, in one possible implementation of the reversing valve provided by this utility model, the low-pressure stabilizing channel includes a main stabilizing channel, a low-pressure branch channel, and a signal branch channel. Therefore, the low-pressure branch channel and the signal branch channel are connected to the main stabilizing channel, the signal branch channel is connected to the signal cavity, and the low-pressure branch channel is adapted to be connected to the pressure relief cavity when the valve core is in the lower position. The valve core contains an oil passage cavity, which is adapted to be connected to the high-pressure cavity when the valve core is in the upper position. The high-pressure stabilizing channel penetrates the side wall of the valve core, with one end connected to the oil passage cavity and the other end connected to the outer side wall of the valve core.

[0020] In conjunction with the first aspect, in one possible implementation of the reversing valve provided by this utility model, the main pressure regulating channel is opened along the axial direction of the valve core and is closed at both ends. The low-pressure branch channel and the signal branch channel are both opened radially along the valve core, with one end connected to the main pressure regulating channel and the other end connected to the outer wall of the valve core.

[0021] In conjunction with the first aspect, in one possible implementation of the reversing valve provided by this utility model, a plurality of low-pressure stabilizing channels and a plurality of high-pressure stabilizing channels are provided along the circumference of the valve core. A low-pressure equalizing groove, a signal equalizing groove and a high-pressure equalizing groove are provided on the outer wall of the valve core. The low-pressure equalizing groove is connected to the low-pressure branch channel, the signal equalizing groove is connected to the signal branch channel, and the high-pressure equalizing groove is connected to the high-pressure stabilizing channel.

[0022] Secondly, this utility model embodiment provides a hydraulic breaker, including the aforementioned reversing valve.

[0023] The beneficial effects of the reversing valve provided by this utility model are as follows: Compared with the prior art, the reversing valve provided by this utility model replaces the existing pressure stabilizing groove with a low-pressure stabilizing channel and a high-pressure stabilizing channel, resulting in a smaller processing area on the outer wall of the moving parts, making it less prone to local deformation, and reducing the number of sharp edges, thereby effectively improving the situation where the surface of the moving parts is prone to roughening, and effectively extending the service life of the workpiece.

[0024] The beneficial effects of the hydraulic breaker provided by this utility model are as follows: Compared with the prior art, the hydraulic breaker provided by this utility model adopts the above-mentioned reversing valve, which effectively improves the situation that the surface of the moving parts is prone to scratching and effectively extends the service life of the workpiece. Attached Figure Description

[0025] Figure 1 This is a cross-sectional view of an existing directional control valve.

[0026] Figure 2 This is a three-dimensional structural diagram of the valve sleeve in an existing directional control valve.

[0027] Figure 3 This is a cross-sectional view of the directional valve sleeve in the upper position according to Embodiment 1 of the present utility model.

[0028] Figure 4 for Figure 3 Enlarged view of part A in the image;

[0029] Figure 5 This is a cross-sectional view of the directional valve sleeve in the lower position according to Embodiment 1 of the present invention.

[0030] Figure 6 for Figure 5 Enlarged view of part B in the image;

[0031] Figure 7 A three-dimensional structural diagram of the valve sleeve of the directional valve provided in Embodiment 1 of this utility model;

[0032] Figure 8 This is a cross-sectional view of the directional valve sleeve in the lower position according to Embodiment 2 of this utility model.

[0033] Figure 9 for Figure 8 Enlarged view of section C in the image;

[0034] Figure 10 This is a cross-sectional view of the directional valve sleeve in the upper position according to Embodiment 2 of this utility model.

[0035] Figure 11for Figure 10 Enlarged view of part D in the image;

[0036] Figure 12 for Figure 10 Schematic diagram of the cross-sectional structure along line BB;

[0037] Figure 13 This is a three-dimensional structural diagram of the valve sleeve of the directional valve provided in Embodiment 2 of this utility model;

[0038] Explanation of reference numerals in the attached figures:

[0039] 10. Valve body; 20. Valve core; 30. Valve sleeve; 41. High-pressure chamber; 42. Signal chamber; 43. Pressure relief chamber;

[0040] 44. Oil passage cavity; 51. First stress-bearing surface; 52. First pressure equalization groove; 53. Second stress-bearing surface;

[0041] 54. Second equalizing tank; 55. Stabilizing tank; 60. Low-pressure stabilizing channel; 70. High-pressure stabilizing channel;

[0042] 81. Main voltage stabilizing channel; 82. Low-voltage branch channel; 83. Signal branch channel; 84. High-voltage branch channel;

[0043] 91. Low-pressure equalization tank; 92. High-pressure equalization tank; 93. Signal equalization tank. Detailed Implementation

[0044] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0045] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. The following description of at least one exemplary embodiment is actually illustrative only and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0046] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0047] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0048] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms 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 on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0049] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, and the spatial relative descriptions used herein will be interpreted accordingly.

[0050] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0051] Please refer to the following: Figures 1 to 2 The present invention describes a conventional directional valve for a hydraulic breaker. The directional valve includes a valve body 10, a valve core 20, and a valve sleeve 30. The valve core 20 is fixedly disposed within the valve body 10, and the valve sleeve 30 is slidably disposed between the valve body 10 and the valve core 20. The valve body 10, the valve core 20, and the valve sleeve 30 cooperate to form a high-pressure chamber 41, a pressure relief chamber 43, and a signal chamber 42. The valve core 20 has an oil passage chamber 44 communicating with the high-pressure chamber 41, and the signal chamber 42 is disposed between the high-pressure chamber 41 and the pressure relief chamber 43. The high-pressure chamber 41 is connected to the high-pressure oil circuit through a high-pressure channel, the pressure relief chamber 43 is connected to the return oil circuit through a return oil channel, and the signal chamber 42 is connected to the cylinder body through a signal channel. The valve sleeve 30 has a first force-bearing surface 51 and a first pressure equalizing groove 52 in the high-pressure chamber 41 along the sliding direction, and a second force-bearing surface 53 and a second pressure equalizing groove 54 in the signal chamber 42. The first force-bearing surface 51, the second force-bearing surface 53, the first pressure equalizing groove 52 and the second pressure equalizing groove 54 are all annular. One side of the first pressure equalizing groove 52 is flush with the first force-bearing surface 51, and one side of the second pressure equalizing groove 54 is flush with the second force-bearing surface 53. The area of ​​the second force-bearing surface 53 is larger than the area of ​​the first force-bearing surface 51. As the piston changes position in the cylinder body, the signal chamber 42 is connected to the high-pressure oil circuit or the return oil circuit, thereby driving the valve sleeve 30 to slide relative to the fixed component to complete the reversing operation.

[0052] Specifically, the valve sleeve 30 moves towards the side of the high-pressure chamber 41 away from the low-pressure chamber 43 until it abuts against the valve core 20. At this time, the valve sleeve 30 is said to be in the upper position. The signal chamber 42 is connected to the return oil circuit and is in a low-pressure state. The pressure on the second force surface 53 is less than the pressure on the first force surface 51, causing the valve sleeve 30 to move towards the side where the pressure relief chamber 43 is located until it abuts against the valve body. At this time, the valve sleeve 30 is said to be in the lower position. The reversing valve completes one reversal, driving the piston in the cylinder to move. After the piston moves to the position, it will connect the signal chamber 42 to the high-pressure oil circuit. The signal chamber 42 is in a high-pressure state and the pressure is equal to that of the high-pressure chamber 41. Since the area of ​​the second force surface 53 is larger than that of the first force surface 51, the valve sleeve 30 will move from the lower position to the upper position, completing another reversal and driving the piston in the cylinder to move in the opposite direction. This cycle repeats.

[0053] like Figure 2 As shown, a pressure stabilizing groove 55 is formed on the surface of the valve sleeve 30. When the moving part is in the lower position, the signal cavity 42 is connected to the pressure relief cavity 43 through the pressure stabilizing groove 55; when the moving part is in the lower position, the signal cavity 42 is connected to the high pressure cavity 41 through the pressure stabilizing groove 55.

[0054] Please refer to the following: Figures 3 to 13 The reversing valve provided by this utility model will now be described.

[0055] Example 1:

[0056] Please refer to the following: Figures 3 to 7 The reversing valve includes a fixed component and a movable component that is slidably disposed within the fixed component. The fixed component and the movable component cooperate to form a high-pressure chamber 41, a pressure relief chamber 43, and a signal chamber 42. The signal chamber 42 is disposed between the high-pressure chamber 41 and the pressure relief chamber 43. The high-pressure chamber 41 is connected to the high-pressure oil circuit through a high-pressure channel. The pressure relief chamber 43 is connected to the return oil circuit through a return oil channel. The signal chamber 42 is connected to the cylinder block through a signal channel.

[0057] The fixed components include a valve body 10 and a valve core 20. The valve core 20 is fixedly installed inside the valve body 10. The movable component is a valve sleeve 30, which is slidably fitted on the valve core 20 and has the freedom to slide along the axial direction of the valve core 20. The valve sleeve 30 is provided with a low-pressure stabilizing channel 60 and a high-pressure stabilizing channel 70.

[0058] The valve sleeve 30 is provided with a low-pressure stabilizing channel 60 and a high-pressure stabilizing channel 70. When the valve sleeve 30 is in the lower position, the two ends of the low-pressure stabilizing channel 60 are adapted to be connected to the signal cavity 42 and the pressure relief cavity 43 respectively. When the valve sleeve 30 is in the upper position, the two ends of the high-pressure stabilizing channel 70 are adapted to be connected to the signal cavity 42 and the high-pressure cavity 41 respectively.

[0059] Specifically, the orifices of the low-pressure stabilizing channel 60 and the high-pressure stabilizing channel 70 are located on the side of the valve sleeve 30, and one of the orifices is always connected to the signal chamber 42. When the valve sleeve 30 is in the lower position, the other orifice of the low-pressure stabilizing channel 60 is connected to the pressure relief chamber 43, and the other orifice of the high-pressure stabilizing channel 70 is connected to the signal chamber 42 or blocked by a fixing component, thus isolating it from the high-pressure chamber 41. When the valve sleeve 30 is in the upper position, the other orifice of the low-pressure stabilizing channel 60 is connected to the signal chamber 42 or blocked by a fixing component, thus isolating it from the pressure relief chamber 43, and the other orifice of the high-pressure stabilizing channel 70 is connected to the high-pressure chamber 41.

[0060] like Figure 4 and Figure 6 As shown, in a specific embodiment of the reversing valve provided in this utility model, the valve sleeve 30 is provided with a pressure stabilizing main channel 81, a low-pressure branch channel 82, a signal branch channel 83, and a high-pressure branch channel 84. The low-pressure branch channel 82, the signal branch channel 83, and the high-pressure branch channel 84 are all connected to the pressure stabilizing main channel 81. The low-pressure branch channel 82 is adapted to be connected to the pressure relief chamber 43 when the valve sleeve 30 is in the lower position. The pressure stabilizing main channel 81, the low-pressure branch channel 82, and the signal branch channel 83 form a low-pressure stabilizing channel 60. The high-pressure branch channel 84 is adapted to be connected to the high-pressure chamber 41 when the valve sleeve 30 is in the upper position. The pressure stabilizing main channel 81, the signal branch channel 83, and the high-pressure branch channel 84 form a high-pressure stabilizing channel 70.

[0061] It should be noted that the low-voltage stabilizing channel 60 and the high-voltage stabilizing channel 70 share the main stabilizing channel 81 and the signal branch channel 83, so as to effectively reduce the amount of processing and lower the processing cost.

[0062] Specifically, such as Figure 4 and Figure 6 As shown, in a specific embodiment of the reversing valve provided in this utility model, the main pressure regulating channel 81 is opened along the axial direction of the valve sleeve 30 and is closed at both ends. The low pressure branch channel 82, the signal branch channel 83 and the high pressure branch channel 84 are all opened radially along the valve sleeve 30, with one end connected to the main pressure regulating channel 81 and the other end connected to the outer wall of the valve sleeve 30.

[0063] It should be noted that the main pressure regulating channel 81, the low-pressure branch channel 82, the signal branch channel 83, and the high-pressure branch channel 84 are all horizontally and vertically aligned, which can effectively reduce the processing difficulty. Among them, when processing the main pressure regulating channel 81, a hole is first drilled from one end of the valve sleeve 30, and then the opening on the end face of the valve sleeve 30 is blocked by welding or installing a plug.

[0064] like Figure 7As shown, in a specific embodiment of the reversing valve provided in this utility model, two to ten sets of pressure-stabilizing main channels 81, low-pressure branch channels 82, signal branch channels 83, and high-pressure branch channels 84 are provided along the circumference of the valve sleeve 30, effectively ensuring the pressure stabilization effect; low-pressure equalizing grooves 91, signal equalizing grooves 93, and high-pressure equalizing grooves 92 are provided on the outer wall of the valve sleeve 30. The low-pressure equalizing groove 91 is connected to all low-pressure branch channels 82, the signal equalizing groove 93 is connected to all signal branch channels 83, and the high-pressure equalizing groove 92 is connected to all high-pressure branch channels 84, so as to effectively improve the balance of oil pressure in the circumference of the valve sleeve 30, make the radial force of the valve sleeve 30 more balanced, and avoid the valve sleeve 30 from jamming or scratching.

[0065] Specifically, four sets of main pressure stabilizing channels 81, low-pressure branch channels 82, signal branch channels 83 and high-pressure branch channels 84 are provided along the circumference of the valve sleeve 30.

[0066] Specifically, the signal equalization slot 93 and the second equalization slot 54 are either aligned or misaligned.

[0067] Preferably, the signal equalization groove 93 coincides with the second equalization groove 54 to reduce the amount of processing.

[0068] The beneficial effects of the reversing valve provided in this embodiment of the present invention are as follows: Compared with the prior art, the reversing valve provided in this embodiment of the present invention replaces the existing pressure stabilizing groove 55 with the low-pressure stabilizing channel 60 and the high-pressure stabilizing channel 70, resulting in a smaller processing area on the outer wall of the valve sleeve 30, making it less prone to local deformation, and reducing the number of sharp edges, thereby effectively improving the situation where the surface of the valve sleeve 30 is prone to roughening, and effectively extending the service life of the workpiece.

[0069] Based on the same inventive concept, this utility model embodiment provides a hydraulic breaker, including the aforementioned reversing valve.

[0070] It should be noted that the connection and installation method between the reversing valve and the cylinder body in this embodiment is the same as that in the existing ones.

[0071] The beneficial effects of the hydraulic breaker provided in this embodiment of the present invention are as follows: Compared with the prior art, the hydraulic breaker provided in this embodiment of the present invention adopts the above-mentioned reversing valve, which effectively improves the situation that the surface of the reversing valve sleeve 30 is prone to scratching and effectively extends the service life of the workpiece.

[0072] Example 2:

[0073] like Figures 8 to 13As shown, the reversing valve includes a fixed component and a movable component that is slidably disposed within the fixed component. The fixed component and the movable component cooperate to form a high-pressure chamber 41, a pressure relief chamber 43, and a signal chamber 42. The signal chamber 42 is disposed between the high-pressure chamber 41 and the pressure relief chamber 43. The high-pressure chamber 41 is connected to the high-pressure oil circuit through a high-pressure channel, the pressure relief chamber 43 is connected to the return oil circuit through a return oil channel, and the signal chamber 42 is connected to the cylinder block through a signal channel.

[0074] It should be noted that in this embodiment, two high-pressure chambers 41 are provided, and both high-pressure chambers 41 are connected to the high-pressure oil circuit through high-pressure channels opened in the valve body.

[0075] The fixed component is the valve body 10, and the movable component is the valve core 20. The valve core 20 is slidably disposed in the valve body 10. The valve core 20 is provided with an oil passage chamber 44, which is suitable for communicating with the high pressure chamber 41 when the valve core 20 is in the upper position. The valve core 20 is provided with a low pressure stabilizing channel 60 and a high pressure stabilizing channel 70.

[0076] The valve core 20 has a low-pressure stabilizing channel 60 and a high-pressure stabilizing channel 70. When the valve core 20 is in the lower position, the two ends of the low-pressure stabilizing channel 60 are adapted to be connected to the signal chamber 42 and the pressure relief chamber 43 respectively. When the valve core 20 is in the upper position, the two ends of the high-pressure stabilizing channel 70 are adapted to be connected to the signal chamber 42 and the high-pressure chamber 41 respectively.

[0077] like Figure 9 and Figure 11 As shown, in a specific embodiment of the reversing valve provided in this utility model, the low-pressure stabilizing channel 60 includes a main stabilizing channel 81, a low-pressure branch channel 82, and a signal branch channel 83. Therefore, the low-pressure branch channel 82 and the signal branch channel 83 are connected to the main stabilizing channel, and the signal branch channel 83 is connected to the signal cavity 42. The low-pressure branch channel 82 is adapted to be connected to the pressure relief cavity 43 when the valve core 20 is in the lower position. The valve core 20 has an oil passage cavity 44, which is connected to the high-pressure cavity 41. The high-pressure stabilizing channel 70 penetrates the side wall of the valve core 20, with one end connected to the oil passage cavity 44 and the other end connected to the outer side wall of the valve core 20.

[0078] Specifically, the orifices of the low-pressure stabilizing channel 60 and the high-pressure stabilizing channel 70 are located on the side of the valve core 20, and the orifice of the signal branch channel 83 on the outer wall of the valve core 20 is always connected to the signal cavity 42, while the orifice of the high-pressure stabilizing channel 70 on the inner wall of the valve core 20 is always connected to the oil passage cavity 44. When the valve core 20 is in the lower position, the low-pressure branch channel 82 is connected to the pressure relief cavity 43, and the signal branch channel 83 is connected to the signal cavity 42, thereby making the pressure relief cavity 43 and the signal cavity 42 conductive. The orifice of the high-pressure stabilizing channel 70 on the outer wall is blocked by the valve body 10, thereby isolating the signal cavity 42 from the high-pressure cavity 41. When the valve core 20 is in the upper position, the low-pressure branch channel 82 is connected to the signal cavity 42, thereby isolating it from the pressure relief cavity 43. The orifice of the high-pressure stabilizing channel 70 on the outer wall is connected to the signal cavity 42, and the connecting cavity is conductive to the high-pressure cavity 41, thus making the signal cavity 42 and the high-pressure cavity 41 conductive.

[0079] like Figure 9 and Figure 11 As shown, in a specific embodiment of the reversing valve provided in this utility model, the main pressure regulating channel 81 is opened along the axial direction of the valve core 20 and is closed at both ends. The low pressure branch channel 82 and the signal branch channel 83 are both opened radially along the valve core 20, with one end connected to the main pressure regulating channel 81 and the other end connected to the outer wall of the valve core 20.

[0080] It should be noted that the main pressure regulating channel 81, the low-pressure branch channel 82, and the signal branch channel 83 are all horizontal and vertical, which can effectively reduce the processing difficulty. Among them, when processing the main pressure regulating channel 81, a hole is first drilled from one end of the valve sleeve 30, and then the opening on the end face of the valve sleeve 30 is blocked by welding or installing a plug.

[0081] like Figure 12 and Figure 13 As shown, in a specific embodiment of the reversing valve provided in this utility model, two to ten low-pressure stabilizing channels 60 and high-pressure stabilizing channels 70 are provided along the circumference of the valve core 20; a low-pressure equalizing groove 91, a signal equalizing groove 93, and a high-pressure equalizing groove 92 are provided on the outer wall of the valve core 20. The low-pressure equalizing groove 91 is connected to the low-pressure branch channel 82, the signal equalizing groove 93 is connected to the signal branch channel 83, and the high-pressure equalizing groove 92 is connected to the high-pressure stabilizing channel 70. This effectively improves the circumferential oil pressure balance of the valve core 20, makes the radial force on the valve core 20 more balanced, and avoids the valve core 20 from jamming or scratching.

[0082] Specifically, two low-pressure stabilizing channels 60 and two high-pressure stabilizing channels 70 are provided along the circumference of the valve core 20.

[0083] Specifically, the signal equalization slot 93 and the second equalization slot 54 are either aligned or misaligned.

[0084] Preferably, the signal equalization groove 93 coincides with the second equalization groove 54 to reduce the amount of processing.

[0085] The beneficial effects of the reversing valve provided in this embodiment of the present invention are as follows: Compared with the prior art, the reversing valve provided in this embodiment of the present invention replaces the existing pressure stabilizing groove 55 with a low-pressure stabilizing channel 60 and a high-pressure stabilizing channel 70, resulting in a smaller processing area on the outer wall of the valve core 20, making it less prone to local deformation, and reducing the number of sharp edges, thereby effectively improving the situation where the surface of the valve core 20 is easily roughened, and effectively extending the service life of the workpiece.

[0086] Based on the same inventive concept, this utility model embodiment provides a hydraulic breaker, including the aforementioned reversing valve.

[0087] It should be noted that the connection and installation method between the reversing valve and the cylinder body in this embodiment is the same as that in the existing ones.

[0088] The beneficial effects of the hydraulic breaker provided by this utility model are as follows: Compared with the prior art, the hydraulic breaker provided by this utility model adopts the above-mentioned reversing valve, thus effectively improving the situation that the surface of the reversing valve core 20 is prone to roughening, and effectively extending the service life of the workpiece.

[0089] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A reversing valve, comprising a fixed component and a movable component slidably disposed within the fixed component, the fixed component and the movable component cooperating to form a high-pressure chamber, a pressure-relief chamber, and a signal chamber, the signal chamber being disposed between the high-pressure chamber and the pressure-relief chamber, characterized in that: The movable component has a low-pressure stabilizing channel and a high-pressure stabilizing channel. The two ends of the low-pressure stabilizing channel are adapted to communicate with the signal cavity and the pressure relief cavity respectively when the movable component is in the lower position. The two ends of the high-pressure stabilizing channel are adapted to communicate with the signal cavity and the high-pressure cavity respectively when the movable component is in the upper position.

2. The reversing valve as described in claim 1, characterized in that, The fixed component includes a valve body and a valve core. The valve core is fixedly disposed in the valve body. The movable component is a valve sleeve, which is slidably sleeved on the valve core and has the freedom to slide along the axial direction of the valve core. The valve sleeve is provided with the low-pressure stabilizing channel and the high-pressure stabilizing channel.

3. The reversing valve as described in claim 2, characterized in that, The valve sleeve is provided with a main pressure stabilizing channel, a low-pressure branch channel, a signal branch channel, and a high-pressure branch channel. The low-pressure branch channel, the signal branch channel, and the high-pressure branch channel are all connected to the main pressure stabilizing channel. The low-pressure branch channel is adapted to communicate with the pressure relief chamber when the valve sleeve is in the lower position. The main pressure stabilizing channel, the low-pressure branch channel, and the signal branch channel constitute the low-pressure stabilizing channel. The high-pressure branch channel is adapted to communicate with the high-pressure chamber when the valve sleeve is in the upper position. The main pressure stabilizing channel, the signal branch channel, and the high-pressure branch channel constitute the high-pressure stabilizing channel.

4. The reversing valve as described in claim 3, characterized in that, The main pressure stabilizing channel is opened along the axial direction of the valve sleeve and is closed at both ends. The low-pressure branch channel, the signal branch channel and the high-pressure branch channel are all opened radially along the valve sleeve, with one end connected to the main pressure stabilizing channel and the other end connected to the outer wall of the valve sleeve.

5. The reversing valve as described in claim 3, characterized in that, Several sets of the main pressure stabilizing channel, the low-pressure branch channel, the signal branch channel, and the high-pressure branch channel are provided along the circumference of the valve sleeve; a low-pressure equalizing groove, a signal equalizing groove, and a high-pressure equalizing groove are provided on the outer wall of the valve sleeve. The low-pressure equalizing groove is connected to the low-pressure branch channel, the signal equalizing groove is connected to the signal branch channel, and the high-pressure equalizing groove is connected to the high-pressure branch channel.

6. The reversing valve as described in claim 1, characterized in that, The fixed component is the valve body, and the movable component is the valve core. The valve core is slidably disposed in the valve body, and the valve core is provided with the low-pressure stabilizing channel and the high-pressure stabilizing channel.

7. The reversing valve as described in claim 6, characterized in that, The low-pressure stabilizing channel includes a main stabilizing channel, a low-pressure branch channel, and a signal branch channel. Therefore, the low-pressure branch channel and the signal branch channel are connected to the main stabilizing channel, and the signal branch channel is connected to the signal cavity. The low-pressure branch channel is adapted to be connected to the pressure relief cavity when the valve core is in the lower position. The valve core contains an oil passage cavity, which is adapted to be connected to the high-pressure cavity when the valve core is in the upper position. The high-pressure stabilizing channel penetrates the side wall of the valve core, with one end connected to the oil passage cavity and the other end connected to the outer side wall of the valve core.

8. The reversing valve as described in claim 7, characterized in that, The main pressure regulating channel is opened along the axial direction of the valve core and is closed at both ends. The low pressure branch channel and the signal branch channel are both opened radially along the valve core, with one end connected to the main pressure regulating channel and the other end connected to the outer wall of the valve core.

9. The reversing valve as described in claim 7, characterized in that, A plurality of low-pressure stabilizing channels and a plurality of high-pressure stabilizing channels are provided along the circumference of the valve core. A low-pressure equalizing groove, a signal equalizing groove and a high-pressure equalizing groove are provided on the outer wall of the valve core. The low-pressure equalizing groove is connected to the low-pressure branch channel, the signal equalizing groove is connected to the signal branch channel, and the high-pressure equalizing groove is connected to the high-pressure stabilizing channel.

10. A hydraulic breaker, characterized in that, Includes the directional valve as described in any one of claims 1-9.

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