A hydraulic grease automatic filling device used for a breaking hammer

Abstract

This invention relates to the field of hydraulic engineering equipment technology, specifically to an automatic hydraulic grease filling device for a hydraulic breaker. The device includes a valve body, a valve core, and a control valve, all in the shape of a regular polygon. A hydraulic port is located on the top surface of the valve body, and a first chamber and a second chamber are coaxially connected at the bottom. The hydraulic port serves as a high-pressure oil inlet and a low-pressure oil outlet, connected to the hydraulic system of the hydraulic breaker via pipelines. This invention utilizes a valve core within the valve body to divide the space into two chambers for storing grease and hydraulic oil, and a control valve to control the oil flow into and out of the hydraulic system of the hydraulic breaker. A second elastic element is placed between the main piston and the first chamber, and a first elastic element is placed between the control valve and the valve body. The rebound force of these elastic elements drives the pistons to precisely reset, allowing the second chamber to alternately perform compression grease discharge and negative pressure grease suction during the working cycle, thereby achieving quantitative pumping and automatic replenishment of the grease.

Description

Technical Field

[0001] This invention relates to the field of hydraulic engineering equipment technology, specifically to an automatic hydraulic grease filling device for use in hydraulic breakers. Background Technology

[0002] A hydraulic breaker is an engineering device that uses hydraulic energy to drive a piston to strike a chisel at high frequency, thereby breaking up hard materials such as rock and concrete. It is widely used in mining, construction, and road maintenance. During operation, the chisel and guide sleeve undergo high-frequency, high-intensity relative motion, requiring lubrication with grease to reduce wear from direct metal-to-metal contact, minimize frictional heat, and prevent dust and impurities from entering, thus extending the equipment's service life.

[0003] In existing technologies, grease application methods mainly include manual application and vibration-assisted automatic application. Manual application requires operators to apply grease regularly using a grease gun. This method requires stopping the breaker operation, which not only fails to guarantee timely lubrication but also seriously affects construction efficiency. Furthermore, uneven or insufficient grease application can accelerate the wear of the drill rod and guide sleeve, shortening the equipment's service life.

[0004] Furthermore, patent application CN201180046707.0 discloses a lubrication system for a breaking tool, which uses a valve core to move between a first and a second position in response to the pressure of the driving fluid, thereby driving a lubricant pumping mechanism to move the lubricant from a container. Although this system employs a hydraulic drive, its technical focus is on redirecting the driving fluid to shut off or reduce the load on the tool when the lubricant level is low. It does not address how to optimize the coordination between the hydraulic drive and the grease pumping mechanism to achieve a stable and quantitative output, nor does it provide a technical solution for adjusting the grease output according to operating conditions.

[0005] Therefore, how to provide a grease filling device that can utilize the stable hydraulic power source of the breaker itself to achieve continuous, stable, and automatic output of lubricating grease, and whose output can be flexibly adjusted according to working conditions, is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0006] In order to overcome the defects in the prior art, the present invention aims to provide an automatic hydraulic grease filling device for hydraulic breakers. By directly connecting the high-pressure oil inlet on the valve body to the hydraulic system of the hydraulic breaker, and using the stable high-pressure hydraulic oil generated during the operation of the hydraulic breaker as the driving power, the present invention overcomes the defects of manual filling which requires machine shutdown and vibration filling which is affected by working conditions and has poor stability. The device achieves continuous, stable and automatic lubrication synchronized with the operation of the hydraulic breaker.

[0007] To achieve the above objectives, the present invention provides an automatic hydraulic grease filling device for use in a hydraulic breaker, comprising a valve body in the shape of a regular polygon, a hydraulic oil port on its top surface, and a first cavity and a second cavity coaxially connected in its bottom. The hydraulic oil port is a high-pressure oil inlet and a low-pressure oil outlet, and the hydraulic oil port is connected to the hydraulic system of the hydraulic breaker through a pipeline. The valve core is movably sleeved in the first cavity and is used to control the connection or disconnection of hydraulic oil with the first cavity; The grease tank is installed on the valve body, and its discharge end is connected to the upper part of the second chamber through a pipe. The grease output pipe is connected to the port of the second cavity. When the hydraulic oil squeezes the valve core, the grease in the second cavity is squeezed into the grease output pipe. When the hydraulic oil returns and the valve core resets, the second cavity expands and draws in grease from the grease tank. A control valve is embedded in the transverse cavity between the first cavity and the hydraulic oil port, and is used to cut off the connection between the high-pressure oil inlet and the first cavity when the hydraulic oil pressure is lower than the threshold.

[0008] As a further improvement to this technical solution, the valve core is composed of a main piston and a second elastic element. The main piston is reset by the rebound of the second elastic element, that is, it moves in the direction of reducing the volume of the first cavity, thereby creating a negative pressure state in the second cavity.

[0009] As a further improvement to this technical solution, a one-way valve is provided between the discharge end of the grease tank and the second cavity to allow the lubricating grease in the tank to flow into the second cavity.

[0010] As a further improvement to this technical solution, a sealing ball is provided inside the central axis of the port of the second cavity and at the connection with the grease output pipe, which is used to allow the grease in the second cavity to flow to the grease output pipe and prevent the grease from flowing back.

[0011] As a further improvement to this technical solution, the control valve is composed of a secondary piston and a first elastic element. The secondary piston is reset by the rebound of the first elastic element, that is, it moves towards the high-pressure oil inlet. During the reset of the main piston, the hydraulic oil in the first chamber is squeezed out and discharged from the low-pressure oil outlet.

[0012] As a further improvement to this technical solution, both the first elastic element and the second elastic element are helical compression springs.

[0013] As a further improvement to this technical solution, a sealing element is provided between the main piston and the first cavity, and between the auxiliary piston and the transverse cavity where the control valve is located.

[0014] As a further improvement to this technical solution, the inner diameter of the port of the second cavity is smaller than the inner diameter of the second cavity, and it is adapted to be fitted with a sealing ball, wherein a spring is embedded in the central axis of the sealing ball.

[0015] As a further improvement to this technical solution, the low-pressure oil outlet is connected to the hydraulic return pipeline of the breaker hammer via a low-pressure oil pipe and a quick-connect coupling.

[0016] As a further improvement to this technical solution, the high-pressure oil inlet is connected to the hydraulic pump outlet pipeline of the hydraulic breaker via a high-pressure oil pipe and a quick-connect coupling.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The hydraulic grease automatic filling device used in this hydraulic breaker has a valve core inside the valve body that divides the valve body into two chambers for storing grease and hydraulic oil. A control valve is set up to control the oil inlet and outlet of the hydraulic system of the hydraulic breaker. A second elastic element is set between the main piston and the first chamber, and a first elastic element is set between the control valve and the valve body. The rebound force of the elastic element drives each piston to accurately reset, so that the second chamber alternately realizes compression discharge and negative pressure suction of grease in the working cycle. This realizes the quantitative pumping and automatic replenishment of grease, ensuring the timeliness and uniformity of lubrication.

[0018] 2. The hydraulic grease automatic filling device used in this hydraulic breaker uses a one-way valve between the grease tank discharge end and the second chamber, and a spring-driven sealing ball at the connection between the second chamber port and the grease output pipe. This one-way conduction mechanism prevents grease backflow during the compression stage and prevents air intake during the negative pressure stage, thereby ensuring the one-way and reliable operation of the pump grease and further improving the accuracy of grease output measurement. Attached Figure Description

[0019] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, guided by the teachings of this invention, will select various possible shapes and proportions to implement the invention according to specific circumstances.

[0020] Figure 1 This is a schematic diagram illustrating the initial working principle of the device of the present invention. Figure 2 This is a schematic diagram illustrating the working principle of the device of the present invention under high-pressure extrusion of lubricating grease. Figure 3 This is a schematic diagram illustrating the working principle of the device of the present invention in the low-pressure grease extraction state; Figure 4This is a front view of the valve body of the present invention under high-pressure hydraulic oil inlet conditions. Figure 5 For the present invention Figure 4 Sectional view of section AA; Figure 6 This is a front view of the valve body of the present invention in a low-pressure hydraulic oil outlet state. Figure 7 For the present invention Figure 6 BB section sectional view; The meanings of the labels in the diagram are as follows: 100. Valve body; 101. First chamber; 102. Second chamber; 103. Sealing ball; 110. Main piston; 120. Second elastic element; 130. Grease tank; 140. Grease output pipe; 200, Control valve; 210, Secondary piston; 220, First elastic element; 230, Low-pressure oil pipe; 240, High-pressure oil pipe. Detailed Implementation

[0021] The details of the present invention can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of the present invention described herein are for illustrative purposes only and should not be construed as limiting the invention in any way. Under the teachings of this invention, those skilled in the art will conceive of any possible variations of the invention, all of which should be considered within the scope of the invention. The terms "installation" and "connection" should be interpreted broadly, referring to direct connection as well as indirect connection through an intermediate medium.

[0022] The terms "central axis," "vertical," "horizontal," "front," "rear," "upper," "lower," "left," "right," "top," "bottom," "inner," and "outer" used herein to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, in the description of the invention, "a number" means two or more, unless otherwise explicitly specified.

[0023] Please see Figures 1-7As shown, this invention provides an automatic hydraulic grease filling device for a hydraulic breaker, comprising a valve body 100 in the shape of a regular polygon, a valve core, and a control valve 200. The valve body 100 has a hydraulic port on its top surface, and a first cavity 101 and a second cavity 102 coaxially connected within its bottom. The hydraulic port serves as a high-pressure oil inlet and a low-pressure oil outlet, connected to the hydraulic system of the hydraulic breaker via pipelines. Its core feature is utilizing the hydraulic power of the hydraulic breaker itself as the driving source. Precision channels are machined inside the valve body to form the first cavity 101, for introducing stored hydraulic oil, and the second cavity 102, for introducing stored grease. The low-pressure oil outlet is connected to the hydraulic return pipeline of the hydraulic breaker via a low-pressure oil pipe 230 and a quick-connect coupling. The high-pressure oil inlet is connected to the hydraulic pump outlet pipeline of the hydraulic breaker via a high-pressure oil pipe 240 and a quick-connect coupling.

[0024] The valve core is movably sleeved in the first cavity 101 and is used to control the connection or disconnection of hydraulic oil with the first cavity 101; the control valve 200 is embedded in the transverse cavity between the first cavity 101 and the hydraulic oil port and is used to cut off the connection between the high pressure oil inlet and the first cavity 101 when the hydraulic oil pressure is lower than the threshold.

[0025] When the hydraulic breaker is not in operation, the system is at low pressure. The valve core returns to the right side of the first chamber 101, closing the passage from the high-pressure oil inlet to the first chamber 101. When the hydraulic breaker is operating, high-pressure hydraulic oil enters the valve body 100, pushing the control valve 200 to open the passage, and then enters the first chamber 101, pushing the valve core to compress the second chamber 102, pumping the grease out from the outlet. When the hydraulic breaker stops or reverses direction, the hydraulic oil pressure decreases, the valve core and control valve 200 reset under the action of the elastic element, and at the same time, the volume of the second chamber 102 expands to form a negative pressure state, thereby drawing in new grease and completing one working cycle. This device completely avoids the drawbacks of manual operation and unstable vibration, achieving automatic lubrication that is synchronized with the operation of the hydraulic breaker, continuous, and quantitative.

[0026] Furthermore, it also includes a grease tank 130, which is installed on the valve body 100, and its discharge end is connected to the upper part of the second cavity 102 through a pipe; a grease output pipe 140 is connected to the port of the second cavity 102, and when the hydraulic oil squeezes the valve core, the grease in the second cavity 102 is squeezed into the grease output pipe 140; when the hydraulic oil returns and the valve core resets, the second cavity 102 expands and draws in grease from the grease tank 130.

[0027] Specifically, the valve core consists of a main piston 110 and a second elastic element 120. The second elastic element 120 rebounds, driving the main piston 110 to reset, i.e., move in the direction of reducing the volume of the first chamber 101, thus creating a negative pressure state in the second chamber 102. A one-way valve is provided between the discharge end of the grease tank 130 and the second chamber 102 to allow the grease in the tank to flow into the second chamber 102. This one-way valve ensures that the grease is only output to the port of the second chamber 102 when compressed by the main piston 110, and does not flow back when the main piston 110 draws it back in, thus ensuring the unidirectional and reliable operation of the grease pump.

[0028] Furthermore, a sealing ball 103 is provided inside the central shaft of the port of the second cavity 102, at the connection point with the grease output pipe 140. A sealing ring is fitted on the outer wall of the sealing ball 103 to allow the grease in the second cavity 102 to flow to the grease output pipe 140 and to prevent the grease from flowing back. The inner diameter of the port of the second cavity 102 is smaller than the inner diameter of the second cavity 102, and is adapted to fit the sealing ball 103. A spring is embedded in the central shaft of the sealing ball 103, and the spring rebound force automatically and promptly resets the sealing ball 103, preventing reverse leakage after the grease is compressed and output, further ensuring pumping efficiency and metering accuracy.

[0029] Specifically, the control valve 200 is composed of a secondary piston 210 and a first elastic element 220. The secondary piston 210 is reset by the rebound of the first elastic element 220, i.e., it moves towards the high-pressure oil inlet. During the reset of the main piston 110, the hydraulic oil in the first chamber 101 is squeezed out and discharged from the low-pressure oil outlet. Both the first elastic element 220 and the second elastic element 120 are helical compression springs. Springs are standard parts, low in cost, reliable in performance, easy to install and replace, and can provide a stable and linear reset force for each piston.

[0030] Furthermore, seals are provided between the main piston 110 and the first chamber 101, and between the auxiliary piston 210 and the transverse chamber where the control valve 200 is located; the seals are preferably O-rings and Glyd rings, which can effectively prevent cross-leakage between high-pressure hydraulic oil and lubricating grease.

[0031] The hydraulic grease automatic filling device used in the hydraulic breaker of this invention introduces high-pressure oil into the high-pressure oil inlet of the valve body 100 when the breaker starts working. The high-pressure oil pushes the auxiliary piston 210 against the first elastic element 220, opening the passage for high-pressure oil to the first chamber 101. The high-pressure oil enters the first chamber 101 and pushes the main piston 110 against the second elastic element 120. The main piston 110 compresses the grease in the second chamber 102, pushing open the sealing ball 103, and pumping it out from the grease output pipe 140, delivering it to the area between the breaker's chisel and guide sleeve for lubrication.

[0032] When the hydraulic breaker reverses direction or stops, the pressure at the high-pressure oil inlet decreases. The auxiliary piston 210 resets under the rebound force of the first elastic element 220, cutting off the high-pressure oil inlet; simultaneously, it connects the first chamber 101 to the low-pressure oil outlet for pressure relief. As the pressure in the first chamber 101 decreases, the main piston 110 resets under the rebound force of the second elastic element 120; the volume of the second chamber 102 increases, creating a negative pressure. The sealing ball 103 rebounds and closes the outlet, while simultaneously opening the one-way valve at the bottom of the grease tank 130, drawing in new grease to fill the second chamber 102, preparing for the next grease-filling work cycle.

[0033] It should be noted that the above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A hydraulic automatic grease filling device for use in a hydraulic breaker, characterized in that: The valve body (100) is a regular polygonal shape. A hydraulic oil port is provided on its top surface. A first cavity (101) and a second cavity (102) are coaxially connected in its bottom. The hydraulic oil port is a high-pressure oil inlet and a low-pressure oil outlet. The hydraulic oil port is connected to the hydraulic system of the hydraulic breaker through a pipeline. The valve core is movably sleeved inside the first cavity (101) and is used to control the connection or disconnection of hydraulic oil with the first cavity (101); The grease tank (130) is installed on the valve body (100), and its discharge end is connected to the upper part of the second cavity (102) through a pipe; The grease output pipe (140) is connected to the port of the second cavity (102). When the hydraulic oil squeezes the valve core, the grease in the second cavity (102) is squeezed into the grease output pipe (140). When the hydraulic oil returns the valve core to reset, the second cavity (102) expands and draws in grease from the grease tank (130). A control valve (200) is embedded in the transverse cavity between the first cavity (101) and the hydraulic oil port, and is used to cut off the connection between the high-pressure oil inlet and the first cavity (101) when the hydraulic oil pressure is lower than the threshold.

2. The hydraulic grease filling device for the hydraulic breaker according to claim 1, characterized in that: The valve core is composed of a main piston (110) and a second elastic element (120). The main piston (110) is reset by the rebound of the second elastic element (120), that is, it moves in the direction of reducing the volume of the first cavity (101), and a negative pressure state is formed in the second cavity (102).

3. The hydraulic automatic grease filling device for the hydraulic breaker according to claim 2, characterized in that: A one-way valve is provided between the discharge end of the grease tank (130) and the second cavity (102) to allow the grease in the tank to flow into the second cavity (102).

4. The hydraulic grease filling device for the hydraulic breaker according to claim 3, characterized in that: A sealing ball (103) is provided inside the central axis of the port of the second cavity (102) and at the connection with the grease output pipe (140) to allow the grease in the second cavity (102) to flow to the grease output pipe (140) and to prevent the grease from flowing back.

5. The hydraulic grease filling device for the hydraulic breaker according to claim 4, characterized in that: The control valve (200) is composed of a secondary piston (210) and a first elastic element (220). The secondary piston (210) is reset by the rebound of the first elastic element (220), that is, it moves towards the high-pressure oil inlet. During the reset of the main piston (110), the hydraulic oil in the first cavity (101) is squeezed out and discharged from the low-pressure oil outlet.

6. The hydraulic automatic grease filling device for the hydraulic breaker according to claim 5, characterized in that: Both the first elastic element (220) and the second elastic element (120) are helical compression springs.

7. The hydraulic automatic grease filling device for the hydraulic breaker according to claim 6, characterized in that: A seal is provided between the main piston (110) and the first cavity (101) and between the auxiliary piston (210) and the transverse cavity where the control valve (200) is located.

8. The hydraulic grease filling device for use in the hydraulic breaker according to claim 7, characterized in that: The inner diameter of the port of the second cavity (102) is smaller than the inner diameter of the second cavity (102), and is adapted to be fitted with the sealing ball (103), wherein the central axis of the sealing ball (103) is embedded with a spring.

9. The hydraulic automatic grease filling device for the hydraulic breaker according to claim 8, characterized in that: The low-pressure oil outlet is connected to the hydraulic return line of the hydraulic breaker via a low-pressure oil pipe (230) and a quick-connect coupling.

10. The hydraulic grease filling device for use in the hydraulic breaker according to claim 9, characterized in that: The high-pressure oil inlet is connected to the hydraulic pump outlet of the hydraulic breaker via a high-pressure oil pipe (240) and a quick-connect coupling.

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