Hydraulic breaking hammer

Abstract

The utility model relates to a hydraulic breaking hammer, and belongs to the technical field of breaking hammers. The hydraulic cylinder comprises a cylinder body and a piston moving in the cylinder body, a high-pressure cavity and an oil seal are arranged in the cylinder body, the hydraulic cylinder further comprises a lower low-pressure cavity arranged in the cylinder body, the lower low-pressure cavity is located between the high-pressure cavity and the oil seal, an oil return pressure control valve is further arranged on the cylinder body, the lower low-pressure cavity is communicated with a valve cavity of the oil return pressure control valve through an oil return channel, and the oil return channel is communicated with the valve cavity of the oil return pressure control valve. A valve cavity of the oil return pressure control valve is communicated with the upper low-pressure cavity through an oil return channel. Certain pressure can be guaranteed under the action of the lower low-pressure cavity, it is guaranteed that an oil film with certain pressure is formed between the high-pressure cavity and the sealing piece, and under the action of the oil film, when the piston impacts a drill rod downwards at a high speed and vibrates and deviates, the risk that the piston makes contact with a cylinder body is reduced, and the service life of the piston is prolonged. And therefore, the aim of reducing the probability of scratches between the piston and the cylinder body is fulfilled.

Description

Technical Field

[0001] The utility model relates to a hydraulic breaker hammer and belongs to the technical field of breaker hammers. Background Art

[0002] Hydraulic breaker, also known as breaker hammer, is powered by the pressure provided by excavators, loaders or pumping stations. The breaker uses the static pressure of liquid as the power to drive the piston to reciprocate. The piston hits the drill rod at high speed during the stroke to transfer energy to the drill rod, which breaks ore, concrete, rock and other solids. It can perform crushing operations more effectively in engineering construction and improve engineering construction efficiency.

[0003] When the breaker hammer is performing a crushing operation, when the piston moves upward and impacts downward, a small amount of high-pressure oil in the high-pressure chamber in the cylinder of the breaker hammer will reach the lower oil seal through the gap between the piston and the cylinder, and when the piston impacts downward quickly, the sealing ring will scrape the hydraulic oil on the surface of the piston, causing the pressure in front of the oil seal to accumulate higher and higher during the continuous reciprocating motion of the piston, which will eventually cause the oil seal to be damaged. Summary of the invention

[0004] The utility model aims at the deficiencies in the prior art and provides a hydraulic breaker.

[0005] The utility model solves the above-mentioned technical problem with the following technical solution: a hydraulic breaker, comprising a cylinder body and a piston movable in the cylinder body, a high-pressure chamber being arranged in the cylinder body, an oil seal being arranged between the cylinder body and the piston, and a lower low-pressure chamber being arranged in the cylinder body, the lower low-pressure chamber being located between the high-pressure chamber and the oil seal, an oil return pressure control valve being arranged on the cylinder body, and the lower low-pressure chamber being connected to the oil return pressure control valve through a first oil return channel.

[0006] The beneficial effect of the utility model is that a lower low-pressure chamber is added to the cylinder body between the high-pressure chamber and the oil seal. Under the action of the lower low-pressure chamber, the pressure behind the oil seal can be at a lower level like the return oil pressure. In order to ensure that the lower low-pressure chamber can maintain a certain pressure and the pressure is not too low, a return oil pressure control valve is also provided, thereby ensuring that an oil film with a certain pressure is formed between the high-pressure chamber and the seal. Under the action of the oil film, when the piston impacts the drill rod downward at high speed and causes vibration deviation, the risk of contact between the piston and the cylinder body is reduced, thereby achieving the purpose of reducing the probability of scratches on the piston and the cylinder body.

[0007] On the basis of the above technical solution, the present invention can also be improved as follows.

[0008] Furthermore, an upper low-pressure chamber is also provided in the cylinder body, and the valve chamber of the return oil pressure control valve is connected with the upper low-pressure chamber through a return oil channel.

[0009] The beneficial effect of adopting the above further scheme is that the hydraulic oil in the added lower low-pressure chamber can be led to the upper low-pressure chamber of the cylinder body through the connecting oil return channel for oil return, effectively utilizing the oil return channel of the original upper low-pressure chamber on the cylinder body.

[0010] Furthermore, the connecting oil return channel includes a second oil return channel, a third oil return channel and a fourth oil return channel which are arranged on the cylinder body and connected, the second oil return channel is connected to the valve chamber of the return oil pressure control valve, and the fourth oil return channel is connected to the upper low-pressure chamber.

[0011] The beneficial effect of adopting the above further solution is that, in order to enable the return oil in the lower low-pressure chamber to smoothly reach the upper low-pressure chamber, three return oil channels are provided on the cylinder body to achieve the communication with the front upper low-pressure chamber.

[0012] Furthermore, the return oil pressure control valve includes a valve body, a valve core and a spring arranged on the valve body. The valve body is connected to the cylinder body. A valve cavity for accommodating the valve core and the spring is provided in the valve body. One end of the spring acts on the valve core, and the other end acts on the valve body.

[0013] The beneficial effect of adopting the above further scheme is that the return oil pressure control valve is installed on the cylinder body through the valve body, and the pressure in the lower low-pressure chamber can act on the valve core through the first return oil channel. When the pressure acting on the valve core is greater than the elastic force of the spring, the valve core can push the spring valve port to open, and the pressure in the lower low-pressure chamber can be released through the return oil pressure control valve. When the pressure acting on the valve core is lower than the pressure of the spring, the valve core closes the valve port under the action of the spring.

[0014] Furthermore, an oil drain hole is provided on the valve core.

[0015] The beneficial effect of adopting the above further solution is that when the valve core moves upward, that is, moves toward the valve cover, the hydraulic oil between the valve core and the valve cover can be discharged through the oil drain hole provided on the valve core.

[0016] Furthermore, an oil drain groove is provided on the valve core.

[0017] The beneficial effect of adopting the above further solution is that when the valve core moves to the top dead center, the pressure passing through the matching gap between the valve core and the valve seat can be discharged through the oil drain groove on the top of the valve core.

[0018] Furthermore, the valve core is provided with a core cavity for positioning the spring.

[0019] The beneficial effect of adopting the above further solution is the stable positioning and restraint of the end of the spring.

[0020] Furthermore, the valve body includes a valve seat and a valve cover, the valve seat is connected to the cylinder body, the valve cover is connected to the valve seat, and the end of the spring acts on the valve cover.

[0021] The beneficial effect of adopting the above further solution is that the positioning of the valve body is achieved by connecting the valve seat with the cylinder body, and the valve cover can seal the valve seat after the various components in the valve body are installed.

[0022] Furthermore, the valve cover is provided with a cover cavity for positioning the spring.

[0023] The beneficial effect of adopting the above further solution is to achieve stable positioning and restraint of the other end of the spring.

[0024] Furthermore, a spring seat is provided at the end where the spring acts on the valve body.

[0025] The beneficial effect of adopting the above further solution is that the spring can act on the valve body or the valve cover through the spring seat, which can support the positioning spring on the one hand and prevent the spring end from wearing the valve body or the valve cover on the other hand. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the utility model;

[0027] Figure 2 for Figure 1 The cross-section along the AA direction;

[0028] Figure 3 for Figure 2 A partial enlarged view of point C in the middle;

[0029] Figure 4 for Figure 1 The cross-section along the BB direction;

[0030] Figure 5 for Figure 4 A partial enlarged view of point D in the middle;

[0031] Figure 6 This is a schematic diagram of the split structure of the oil return pressure control valve of the utility model;

[0032] Figure 7 for Figure 1 Right view of;

[0033] Figure 8 for Figure 7 The cross section along the EE direction;

[0034] Fig. 9 for Figure 8 A partial enlarged view of point F in the middle;

[0035] In the figure, 1. cylinder body; 2. piston; 3. high-pressure chamber; 4. oil seal; 5. lower low-pressure chamber; 6. return oil pressure control valve; 61. valve core; 62. spring; 63. valve seat; 64. valve cover; 65. spring seat; 66. oil drain hole; 67. oil drain groove; 7. first return oil channel; 8. second return oil channel; 9. third return oil channel; 10. fourth return oil channel; 11. upper low-pressure chamber. DETAILED DESCRIPTION

[0036] The principles and features of the present invention are described below in conjunction with examples. The examples are only used to explain the present invention and are not used to limit the scope of the present invention.

[0037] like Figure 1-Figure 9 As shown, a hydraulic breaker comprises a cylinder body 1 and a piston 2 movable in the cylinder body 1, a high-pressure chamber 3 is provided in the cylinder body 1, an oil seal 4 is provided between the cylinder body 1 and the piston 2, and a lower low-pressure chamber 5 is provided in the cylinder body 1, the lower low-pressure chamber 5 is located between the high-pressure chamber 3 and the oil seal 4, and a return oil pressure control valve 6 is provided on the cylinder body 1, and the lower low-pressure chamber 5 is connected to the return oil pressure control valve 6 through a first return oil channel 7.

[0038] An upper low-pressure chamber 11 is also provided in the cylinder body 1, and the valve chamber of the return oil pressure control valve 6 is connected to the upper low-pressure chamber 11 through a connecting return oil passage. The hydraulic oil in the added lower low-pressure chamber 5 can be led to the upper low-pressure chamber 11 of the cylinder body 1 through the connecting return oil passage for oil return, effectively utilizing the return oil passage of the original upper low-pressure chamber 11 on the cylinder body 1.

[0039] The connecting oil return passage includes a second oil return passage 8, a third oil return passage 9 and a fourth oil return passage 10 which are arranged on the cylinder body 1 and are connected. The second oil return passage 8 is connected to the valve chamber of the oil return pressure control valve 6, and the fourth oil return passage 10 is connected to the upper low-pressure chamber 11. In order to enable the return oil in the lower low-pressure chamber 5 to smoothly reach the upper low-pressure chamber 11, three oil return passages are arranged on the cylinder body 1 to realize the connection of the front upper low-pressure chamber 11.

[0040] The oil return pressure control valve 6 includes a valve body, a valve core 61 and a spring 62 arranged on the valve body. The valve body is connected to the cylinder body 1. A valve cavity for accommodating the valve core 61 and the spring 62 is arranged in the valve body. One end of the spring 62 acts on the valve core 61, and the other end acts on the valve body. The oil return pressure control valve 6 is installed on the cylinder body 1 through the valve body. The pressure of the lower low-pressure chamber 5 can act on the valve core 61 through the first oil return passage 7. When the pressure acting on the valve core 61 is greater than the elastic force of the spring 62, the valve core 61 can push the spring 62 to open the valve port, and the pressure in the lower low-pressure chamber 5 can be released through the oil return pressure control valve 6. When the pressure acting on the valve core 61 is lower than the pressure of the spring 62, the valve core 61 closes the valve port under the action of the spring 62.

[0041] The valve core 61 is provided with an oil leakage hole 66 . When the valve core 61 moves upward, that is, moves toward the valve cover 64 , the hydraulic oil between the valve core 61 and the valve cover 64 can be discharged through the oil leakage hole 66 provided on the valve core 61 .

[0042] The valve core 61 is provided with an oil drain groove 67. When the valve core 61 moves to the top dead center, the pressure passing through the matching gap between the valve core 61 and the valve seat 63 can be drained through the oil drain groove 67 at the top of the valve core 61.

[0043] The valve core 61 is provided with a core cavity for positioning the spring 62 to stably position and constrain the end of the spring 62.

[0044] The valve body includes a valve seat 63 and a valve cover 64, wherein the valve seat 63 is connected to the cylinder body 1, and the valve cover 64 is connected to the valve seat 63, and the end of the spring 62 acts on the valve cover 64. Specifically, the valve seat 63 is connected to the cylinder body 1 to realize the positioning of the valve body, and the valve cover 64 can seal the valve seat 63 after the various components in the valve body are installed.

[0045] The valve cover 64 is provided with a cover cavity for positioning the spring 62, so as to realize stable positioning and restraint of the other end of the spring 62.

[0046] The end of the spring 62 acting on the valve body is provided with a spring seat 65. The spring 62 can act on the valve body or the valve cover 64 through the spring seat 65, which can support and position the spring 62 on the one hand and prevent the end of the spring 62 from wearing the valve body or the valve cover 64 on the other hand.

[0047] The pressure of the lower low-pressure chamber 5 acts on the valve core 61 through the first oil return channel 7. When the pressure acting on the valve core 61 is greater than the elastic force of the spring 62, Figure 4As shown, the valve core 61 pushes the spring 62 upward, the valve port is opened, and the pressure in the lower low-pressure chamber 5 enters the upper low-pressure chamber 11 through the first oil return channel 7, the second oil return channel 8, the third oil return channel 9, and the fourth oil return channel 10, thereby releasing the pressure; when the pressure acting on the valve core 61 is lower than the pressure of the spring 62, the valve core 61 closes the valve port under the action of the spring 62, thereby ensuring that the pressure in the lower low-pressure chamber 5 is basically maintained at a constant level. There are oil drain holes 66 and oil drain grooves 67 on the valve core 61. Figure 4 As shown, when the valve core 61 moves upward, the hydraulic oil between the valve core 61 and the valve cover 64 can be discharged through the oil drain hole 66; when the valve core 61 moves to the top dead center, the pressure passing through the matching gap between the valve core 61 and the valve seat 63 can be drained through the oil drain groove 67 on the top of the valve core 61. The return oil pressure control valve 6 can use a larger spring 62, which has better stability and can ensure that its elastic coefficient is more stable under continuous overflow conditions. At the same time, the return oil pressure control valve 6 has a simple structure, a simple manufacturing process, and is easy to maintain. The utility model adds a lower low-pressure chamber 5 to the cylinder body 1 between the high-pressure chamber 3 and the oil seal 4, and sets a return oil pressure control valve 6 to ensure that an oil film with a certain pressure is formed between the high-pressure chamber 3 and the seal. Under the action of the oil film, when the piston 2 impacts the drill rod downward at a high speed and vibrates and deviates, the risk of contact between the piston 2 and the cylinder body 1 is reduced, thereby achieving the purpose of reducing the probability of scratch failure of the piston 2 and the cylinder body 1.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A hydraulic breaker, comprising a cylinder (1) and a piston (2) movable in the cylinder (1), wherein a high pressure chamber (3) and an oil seal (4) are provided in the cylinder (1), characterized in that: The invention also comprises a lower low-pressure chamber (5) disposed in the cylinder body (1) and connected to the return oil, wherein the lower low-pressure chamber (5) is located between the high-pressure chamber (3) and the oil seal (4), and further comprises an oil return pressure control valve (6), wherein the oil return pressure control valve is disposed on the cylinder body (1), and the lower low-pressure chamber (5) is connected to the oil return pressure control valve (6) via a first oil return passage (7).

2. The hydraulic breaker according to claim 1, characterized in that: An upper low-pressure chamber (11) is also provided in the cylinder body (1), and the valve chamber of the oil return pressure control valve (6) is connected to the upper low-pressure chamber (11) via an oil return channel.

3. The hydraulic breaker according to claim 2, characterized in that: The communicating oil return passage comprises a second oil return passage (8), a third oil return passage (9) and a fourth oil return passage (10) which are arranged on the cylinder body (1) and are in communication with each other, the second oil return passage (8) being in communication with the valve chamber of the oil return pressure control valve (6), and the fourth oil return passage (10) being in communication with the upper low-pressure chamber (11).

4. The hydraulic breaker according to claim 1, 2 or 3, characterized in that: The return oil pressure control valve (6) comprises a valve body, a valve core (61) and a spring (62) arranged on the valve body. The valve body is connected to the cylinder body (1). A valve cavity for accommodating the valve core (61) and the spring (62) is provided in the valve body. One end of the spring (62) acts on the valve core (61), and the other end acts on the valve body.

5. The hydraulic breaker according to claim 4, characterized in that: The valve core (61) is provided with an oil drain hole (66) and / or an oil drain groove (67).

6. The hydraulic breaker according to claim 4, characterized in that: The valve core (61) is provided with a core cavity for positioning the spring (62).

7. The hydraulic breaker according to claim 4, characterized in that: The valve body comprises a valve seat (63) and a valve cover (64); the valve seat (63) is connected to the cylinder body (1); the valve cover (64) is connected to the valve seat (63); and the end of the spring (62) acts on the valve cover (64).

8. The breaker hammer according to claim 7, characterized in that: The valve cover (64) is provided with a cover cavity for positioning the spring (62).

9. The hydraulic breaker according to claim 4, characterized in that: A spring seat (65) is provided at the end of the spring (62) acting on the valve body.

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