Hydraulic valve with buffering function and breaking hammer

Abstract

The utility model provides a hydraulic valve with a buffering function and a breaking hammer, which belong to the technical field of breaking hammers and comprise a valve body, a valve core, a valve sleeve and a valve cover, a mounting cavity is formed in the valve body, the valve element and the valve sleeve are mounted in the mounting cavity, the valve element is sleeved with the valve sleeve, the valve sleeve is connected with the valve element and the valve body in a sliding fit mode, a boss is arranged on the valve element, a moving distance is formed between the boss and the bottom of the mounting cavity, and the valve deck is fixedly mounted on the valve body. A branch reversing oil cavity is formed in the mounting cavity of the valve body, a buffering cavity which is located at the end of the moving distance and extends in the direction away from the valve sleeve is further formed in the valve body, and the end of the valve sleeve is used for being connected with the buffering cavity in a sliding fit mode. According to the hydraulic valve with the buffering function, the phenomenon of instantaneous starting and stopping of the valve sleeve is eliminated, the pressure peak value change caused by sudden change of the flow speed of oil in the reversing valve is reduced, it is ensured that the reversing valve has high control precision, and meanwhile noise cannot be generated.

Description

Technical Field

[0001] This utility model belongs to the field of hydraulic breaker technology, and more specifically, it relates to a hydraulic valve with buffer function and a hydraulic breaker. Background Technology

[0002] A hydraulic breaker is a widely used hydraulic impact device in engineering machinery, primarily used for rock breaking, concrete demolition, and mining. Its working principle involves a hydraulic system driving an internal piston to reciprocate at high speed, converting hydraulic energy into mechanical impact energy, thereby transmitting a high-intensity impact force to the end of the drill bit to break hard materials. The core performance indicators of a hydraulic breaker include impact frequency, impact energy, and reliability, while precise control of the hydraulic system is crucial for achieving efficient and stable operation. The directional valve is the core component of the hydraulic breaker's hydraulic control system, responsible for controlling the flow direction and distribution of hydraulic oil to achieve the reciprocating motion of the piston. During the axial movement of the valve sleeve in the directional valve, the instantaneous start and stop of the valve sleeve generates significant inertial impact, causing sudden changes in the oil flow rate within the directional valve, resulting in pressure peaks and a decrease in the control accuracy of the directional valve. Simultaneously, the high-frequency movement of the valve sleeve colliding with the valve body generates structural vibration, leading to noise in the directional valve. Utility Model Content

[0003] The purpose of this utility model is to provide a hydraulic valve and a hydraulic breaker with a buffer function to solve the technical problems in the prior art where axial movement of the valve sleeve causes a decrease in control accuracy and noise occurs in the directional valve.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A hydraulic valve with a buffer function is provided, comprising a valve body, a valve core, a valve sleeve, and a valve cover; the valve body has an installation cavity, the valve core and the valve sleeve are installed in the installation cavity, and the valve sleeve is fitted onto the valve core, the valve sleeve is slidably connected to the valve core and the valve body, the valve core has a boss, and a moving distance is formed between the boss and the bottom of the installation cavity for the sliding of the valve sleeve; the valve cover is fixedly installed on the valve body, and one end is connected to the valve core for limiting and fixing the valve core; the installation cavity of the valve body has reversing oil chambers corresponding to the two ends of the moving distance, and the valve body also has a buffer cavity located at the end of the moving distance and extending away from the valve sleeve, the end of the valve sleeve is slidably connected to the buffer cavity.

[0005] In one possible implementation, the buffer chamber is an annular groove formed in the valve body and located at the bottom of the mounting cavity. The annular groove is arranged side by side and connected with the reversing oil chamber near the valve body along the axial direction.

[0006] In one possible implementation, the buffer chamber is an annular groove formed on the side of the boss near the moving distance, and the annular groove is arranged side by side and connected with the reversing oil chamber near the valve body along the axial direction.

[0007] In one possible implementation, there are two buffer cavities, located on the outer sides of both ends of the moving distance.

[0008] In one possible implementation, the two buffer cavities are annular grooves formed on the boss and the valve body, with one annular groove located on the side of the boss near the moving distance and the other annular groove located at the bottom of the mounting cavity.

[0009] In one possible implementation, the buffer cavity has a bevel on the side near the moving distance.

[0010] In one possible implementation, the end of the valve sleeve is provided with a chamfered structure.

[0011] The beneficial effects of the hydraulic valve with buffer function provided by this utility model are as follows: Compared with the prior art, the hydraulic valve with buffer function of this utility model, during installation, the valve sleeve and valve core are installed into the mounting cavity of the valve body one after the other, and then the valve cover is installed and fixedly mounted on the end of the valve body, so that one end of the valve cover abuts against one end of the valve core, thereby realizing the limiting and fixing of the valve core, and the valve sleeve is moved within the mounting cavity by means of the boss; by means of the sliding fit connection of the valve sleeve, the valve sleeve slides within the moving distance, and at the same time, the buffer cavity in the valve body is formed at the end of the moving distance, increasing the moving distance of the valve sleeve. When hydraulic oil flows through the reversing oil chamber, it pushes the valve sleeve to slide within the moving distance of the mounting chamber. When the valve sleeve moves to the end of the moving distance, the movement of the valve sleeve is buffered by the action of the buffer chamber and the hydraulic oil, thereby eliminating the instantaneous start and stop of the valve sleeve, reducing the pressure peak change caused by the sudden change in the oil flow rate in the reversing valve, and ensuring that the reversing valve has high control accuracy. At the same time, the buffering effect of the buffer chamber prevents the valve sleeve from colliding with the valve body, avoiding noise from the reversing valve.

[0012] Another objective of this invention is to provide a hydraulic breaker, including any of the above-mentioned hydraulic valves with a buffering function.

[0013] This utility model provides a hydraulic breaker. By adopting a hydraulic valve with a buffer function, the instantaneous start and stop of the valve sleeve is eliminated, and the pressure peak change caused by the sudden change in the oil flow rate in the reversing valve is reduced, ensuring that the reversing valve has high control accuracy, thereby ensuring that the hydraulic breaker works more effectively and stably. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 A schematic diagram of the structure of a hydraulic valve with buffer function provided in an embodiment of this utility model;

[0016] Figure 2 A cross-sectional view of a hydraulic valve with a buffer function provided in an embodiment of this utility model.

[0017] The following are the labeling elements in the figure:

[0018] 10. Valve body; 11. Mounting cavity; 12. Movement distance; 13. Reversing oil cavity; 14. Buffer cavity; 15. Bevel; 20. Valve core; 21. Boss; 30. Valve sleeve; 31. Chamfered structure; 40. Valve cover. Detailed Implementation

[0019] 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.

[0020] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0021] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" 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 utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0023] Please see Figure 1 and Figure 2 The present invention provides a hydraulic valve with a buffer function. A hydraulic valve with a buffer function includes a valve body 10, a valve core 20, a valve sleeve 30, and a valve cover 40. The valve body 10 has a mounting cavity 11, in which the valve core 20 and valve sleeve 30 are mounted. The valve sleeve 30 is fitted onto the valve core 20, and the valve sleeve 30 is slidably connected to the valve core 20 and the valve body 10. The valve core 20 has a boss 21, and a sliding distance 12 is formed between the boss 21 and the bottom of the mounting cavity 11 for sliding of the valve sleeve 30. The valve cover 40 is fixedly mounted on the valve body 10, and one end is connected to the valve core 20 for limiting and fixing the valve core 20. The mounting cavity 11 of the valve body 10 has reversing oil chambers 13 corresponding to the two ends of the sliding distance 12. The valve body 10 also has a buffer cavity 14 located at the end of the sliding distance 12 and extending away from the valve sleeve 30. The end of the valve sleeve 30 is slidably connected to the buffer cavity 14.

[0024] The hydraulic valve with buffer function provided by this utility model, compared with the prior art, involves installing the valve sleeve 30 and valve core 20 into the mounting cavity 11 of the valve body 10 in sequence, and then installing the valve cover 40 and fixing it at the end of the valve body 10, so that one end of the valve cover 40 abuts against one end of the valve core 20, thereby limiting and fixing the valve core 20. With the help of the boss 21, a moving distance 12 for the valve sleeve 30 to move is formed in the mounting cavity 11. With the sliding fit connection of the valve sleeve 30, the valve sleeve 30 slides in the moving distance 12. At the same time, the buffer cavity 14 in the valve body 10 is formed at the end of the moving distance 12, increasing the moving distance of the valve sleeve 30. When hydraulic oil flows through the reversing oil chamber 13, it pushes the valve sleeve 30 to slide within the moving distance 12 of the mounting chamber 11. When the valve sleeve 30 moves to the end of the moving distance 12, the movement of the valve sleeve 30 is buffered by the action of the buffer chamber 14 and the hydraulic oil, thereby eliminating the instantaneous start and stop of the valve sleeve 30, reducing the pressure peak change caused by the sudden change in the oil flow rate in the reversing valve, and ensuring that the reversing valve has high control accuracy. At the same time, the buffering effect of the buffer chamber 14 prevents the valve sleeve 30 from colliding with the valve body 10, avoids noise from the reversing valve, and achieves the purpose of quiet operation.

[0025] Please see Figure 1 and Figure 2As a specific embodiment of the hydraulic valve with buffer function provided by this utility model, the buffer chamber 14 is an annular groove opened in the valve body 10 and located at the bottom of the mounting cavity 11. The annular groove and the reversing oil cavity 13 are arranged side by side along the axial direction of the valve body 10 and are connected. The annular groove is directly opened at the bottom of the mounting cavity 11 of the valve body 10, and the annular groove is located on the side of the reversing oil cavity 13 away from the top plate of the mounting cavity 11, so that the annular groove serves as an extension of the moving distance 12. The annular groove and the reversing oil cavity 13 are arranged side by side and are connected. The radial dimension of the annular groove is smaller than the radial dimension of the reversing oil cavity 13. In this way, the buffer chamber 14 is formed by the structure of the mounting cavity 11 of the valve body 10 itself, ensuring the stability of the internal pressure of the entire valve body 10 and avoiding the impact of pressure fluctuations on the normal operation of the valve body 10.

[0026] Please see Figure 1 and Figure 2 As a specific embodiment of the hydraulic valve with buffering function provided by this utility model, the buffer chamber 14 is an annular groove formed on the side of the boss 21 near the moving distance 12. The annular groove is arranged side by side and connected with the oil chamber near the reversing chamber 13 along the axial direction of the valve body 10; that is, an annular groove is formed on the boss 21 of the valve core 20, and the annular groove corresponds coaxially with the distance, so that the annular groove serves as an extension of the moving distance 12. In this way, after the valve core 20 is assembled into the valve body 10, the buffer chamber 14 located at the end of the moving distance 12 can be formed inside the valve body 10 by means of the valve body 10 itself. Specifically, the projection of the annular groove is completely consistent with that of the boss 21, which facilitates processing. The groove wall of the annular groove is smooth, which can reduce the resistance when the fluid flows in it and ensure the stability of the buffering effect.

[0027] Please see Figure 1 and Figure 2 As a specific embodiment of the hydraulic valve with buffer function provided by this utility model, there are two buffer chambers 14, which are located on the outer sides of both ends of the moving distance 12 respectively. By setting the structure of two buffer chambers 14, when the valve sleeve 30 moves left and right within the moving distance 12 to realize the reversing function of the hydraulic valve, the movement of the valve sleeve 30 in both directions can enter the corresponding buffer chamber 14, so that the buffer chamber 14 can effectively accommodate and buffer the impact force applied by the outside.

[0028] Preferably, the two buffer cavities 14 are annular grooves formed on the boss 21 and the valve body 10, with one annular groove located on the side of the boss 21 near the moving distance 12 and the other annular groove located at the bottom of the mounting cavity 11. The two buffer cavities 14 are formed by setting annular grooves on the bottom of the mounting cavity 11 and one side of the boss 21 respectively, so that the two buffer cavities 14 are extensions at both ends of the moving distance 12.

[0029] Please see Figure 1 and Figure 2 As a specific embodiment of the hydraulic valve with buffer function provided by this utility model, the buffer cavity 14 is provided with a bevel 15 on the side near the moving distance 12. The bevel 15 can play a good guiding role during movement, avoiding unnecessary friction and collision between the end of the bushing and the inner wall of the buffer cavity 14 when it enters the buffer cavity 14, thereby effectively reducing wear and energy loss. The buffer cavity 14 is located at the end of the moving distance 12, and the bevel 15 enables the buffer cavity 14 to form a smoother connection with the moving distance 12.

[0030] Please see Figure 1 and Figure 2 As a specific embodiment of the hydraulic valve with buffer function provided by this utility model, the end of the valve sleeve 30 is provided with a chamfered structure 31. During the axial movement of the valve sleeve 30, the chamfered structure 31 allows it to smoothly enter the buffer chamber 14 without easily causing jamming. The chamfered structure also effectively reduces the resistance of the fluid at the end of the valve sleeve 30, making the fluid flow smoother. At the same time, the chamfered structure 31 also enhances the strength of the end of the valve sleeve 30, preventing breakage or damage due to external impact during use.

[0031] Not shown in the figure, this utility model embodiment also provides a hydraulic breaker, which includes any of the above-mentioned hydraulic valves with a buffer function.

[0032] The hydraulic breaker provided by this utility model adopts the aforementioned hydraulic valve with buffer function, thus eliminating the instantaneous start and stop phenomenon of valve sleeve 30, reducing the pressure peak change caused by sudden changes in oil flow rate in the reversing valve, ensuring that the reversing valve has high control accuracy, and thus ensuring that the hydraulic breaker works more effectively and stably.

[0033] The above are merely preferred embodiments of the present utility model and are 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 hydraulic valve with a buffer function, characterized in that, The valve includes a valve body, a valve core, a valve sleeve, and a valve cover. The valve body has a mounting cavity in which the valve core and valve sleeve are mounted, with the valve sleeve fitted over the valve core. The valve sleeve is slidably connected to the valve core and the valve body. The valve core has a boss, and a sliding gap is formed between the boss and the bottom of the mounting cavity for the valve sleeve to slide. The valve cover is fixedly mounted on the valve body, with one end connected to the valve core for limiting and fixing the valve core. The mounting cavity of the valve body has reversing oil chambers corresponding to the two ends of the sliding gap. The valve body also has a buffer cavity located at the end of the sliding gap and extending away from the valve sleeve. The end of the valve sleeve is slidably connected to the buffer cavity.

2. The hydraulic valve with buffer function as described in claim 1, characterized in that, The buffer chamber is an annular groove formed in the valve body and located at the bottom of the mounting cavity. The annular groove and the reversing oil chamber are arranged side by side along the axial direction of the valve body and are connected.

3. The hydraulic valve with buffer function as described in claim 1, characterized in that, The buffer chamber is an annular groove formed on the side of the boss near the moving distance. The annular groove and the reversing oil chamber are arranged side by side along the axial direction of the valve body and are connected.

4. The hydraulic valve with buffer function as described in claim 1, characterized in that, There are two buffer cavities, located on the outer sides of both ends of the moving distance.

5. The hydraulic valve with buffer function as described in claim 4, characterized in that, The two buffer cavities are annular grooves formed on the boss and the valve body, with one annular groove located on the side of the boss near the moving distance and the other annular groove located at the bottom of the mounting cavity.

6. The hydraulic valve with buffer function as described in claim 1, characterized in that, The buffer cavity has a bevel on the side near the moving distance.

7. The hydraulic valve with buffer function as described in claim 1, characterized in that, The valve sleeve has a chamfered structure at its end.

8. A hydraulic breaker, characterized in that, Includes a hydraulic valve with a buffer function as described in any one of claims 1-7.

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