Impact-resistant hydraulic cylinder for mine machinery

Abstract

The present application relates to the technical field of hydraulic oil cylinder, disclose a kind of anti-impact hydraulic oil cylinder for mine machinery, including cylinder and hydraulic pump, hinge rod is arranged on the upper end of cylinder, telescopic rod is arranged in the inside of cylinder, piston is arranged on the outer wall of telescopic rod, liquid inlet pipe is arranged at the both ends of cylinder, two The liquid inlet pipe is interconnected with hydraulic pump, it further includes anti-impact unit arranged in the inside of telescopic rod, the anti-impact unit includes variable component between telescopic rod and cylinder and buffer component on the outer wall of cylinder;By designing anti-impact unit, when the telescopic end of hydraulic oil cylinder is impacted, variable component can first time block liquid inlet pipe by impact force, to prevent the hydraulic oil after being pressurized by impact force directly into the inside of hydraulic pump to cause damage, while blocking liquid inlet pipe, spare liquid outlet pipe opens, so that the pressurized hydraulic oil can enter the inside of buffer tank.

Description

Technical Field

[0001] This invention relates to the technical field of hydraulic cylinders, and more particularly to an impact-resistant hydraulic cylinder for mining machinery. Background Technology

[0002] Hydraulic cylinders used in mining machinery are the core power actuators of mining equipment. Their main function is to convert the hydraulic energy of the hydraulic system into mechanical energy, driving the mining machinery to complete heavy-duty and high-frequency key actions such as support, pushing, and cutting. They are key components to ensure safe and efficient mining. The hydraulic cylinder consists of a cylinder body, piston, seals, buffer device, and exhaust valve. The cylinder body and piston form a closed chamber. The piston is driven by the inflow and outflow of hydraulic oil. The buffer device can reduce the impact during start-up and shutdown, and the exhaust valve can discharge air from the cylinder to prevent jamming during operation.

[0003] While existing hydraulic cylinders are capable of handling complex mining operations, they still present the following problems: When operators are mining, the hydraulic cylinders collide and impact with the mine during operation. When the extension end of the hydraulic cylinder experiences a horizontal impact, the extension rod converts the impact into piston compression of the hydraulic oil. The reverse force of the high-pressure oil compressed by the impact directly acts on the hydraulic pump, damaging internal seals or impacting the pump's internal moving parts. Since the hydraulic pump has a rated working pressure, the reverse high pressure forces the pump to be in an overloaded state for a long time. At the same time, the pressure fluctuations formed by the reverse high pressure are transmitted through the oil circuit, affecting not only the hydraulic pump but also potentially the entire system. Therefore, it is necessary to design an impact-resistant hydraulic cylinder. When the hydraulic cylinder is subjected to impact, the flow channel of the hydraulic oil inside it quickly switches to prevent the pressurized hydraulic oil from directly acting on the hydraulic pump and causing damage. Summary of the Invention

[0004] In view of the problem that the directional pressure generated by the hydraulic oil after the extension end of the hydraulic cylinder is impacted, the hydraulic pump is damaged by the impact, so an impact-resistant hydraulic cylinder for mining machinery is proposed.

[0005] This application provides an impact-resistant hydraulic cylinder for mining machinery. The purpose is to: design an impact-resistant unit so that when the extension end of the hydraulic cylinder is subjected to an impact force, the variable component can immediately block the inlet pipe through the impact force to prevent the hydraulic oil pressurized by the impact force from directly entering the hydraulic pump and causing damage. At the same time as blocking the inlet pipe, the spare outlet pipe is opened so that the pressurized hydraulic oil can enter the buffer tank, so that the extension rod can be effectively buffered after being subjected to the impact force, preventing the extension rod from bending and affecting subsequent use.

[0006] The technical solution of the present invention is as follows: an impact-resistant hydraulic cylinder for mining machinery, comprising a cylinder body and a hydraulic pump, a hinge rod disposed at the upper end of the cylinder body, a telescopic rod disposed inside the cylinder body, a piston disposed on the outer wall of the telescopic rod, and inlet pipes disposed at both ends of the cylinder body, both of which are connected to the hydraulic pump. It also includes an anti-impact unit disposed inside the telescopic rod, the anti-impact unit comprising a connecting component disposed between the telescopic rod and the cylinder body and a buffer component on the outer wall of the cylinder body.

[0007] The adaptable component includes an extension disc disposed on the inner bottom wall of the telescopic rod, the other end of the extension disc being fixedly connected to the inner wall of the cylinder, a bearing cylinder rotatably disposed on the side wall of the extension disc, a trigger rod slidably disposed inside the bearing cylinder, a limiting rod disposed on the outer wall of the trigger rod, a limiting groove opened on the inner wall of the bearing cylinder, the limiting rod being slidably installed in the limiting groove, a leaf spring disposed between the extension disc and the side wall of the trigger rod, a connecting disc disposed at one end of the trigger rod, a pin disposed on the side wall of the connecting disc, and a rotating assembly disposed on the trigger rod.

[0008] The rotating assembly includes a spiral groove on the outer wall of the trigger rod, a protruding rod on the inner wall of the telescopic rod, one end of the protruding rod being located inside the spiral groove, a rotating disk on the outer wall of the extension disk, a connecting plate on the outer wall of the rotating disk, and a closed arc plate on the outer wall of the connecting plate. The end face of the closed arc plate is not a complete circle. In the initial state, the incomplete area of ​​the closed arc plate is located directly above the liquid inlet pipe.

[0009] Furthermore, the buffer component includes a buffer box disposed on the outer wall of the cylinder body, a spare liquid outlet pipe disposed on the outer wall of the cylinder body, the end face angle between the spare liquid outlet pipe and the corresponding liquid inlet pipe is 90°, and the end of the spare liquid outlet pipe away from the cylinder body is connected to the interior of the buffer box.

[0010] Furthermore, the buffer tank is equipped with an isolation plate inside, which divides the buffer tank into two areas. The area close to the liquid inlet pipe is the first chamber, and the other area is the second chamber. A change component is provided on the isolation plate.

[0011] Furthermore, the variable component includes a circular groove formed on the upper end of the isolation plate, a rotating shaft disposed on the side wall of the isolation plate, and an opening and closing plate disposed on the outer wall of the rotating shaft. The end face shape of the opening and closing plate is the same as the end face shape of the circular groove, and a trigger element is installed on the corresponding liquid inlet pipe.

[0012] Furthermore, the triggering element includes a shaft disposed at the upper end of the inlet pipe, a rotating wheel disposed at the upper end of the shaft, and a rubber ring disposed on the surface of the rotating wheel. The rotating wheel is in close contact with the surface of the closed arc plate, and both ends of the shaft and the rotating shaft are connected to each other by a gear set for transmission.

[0013] Furthermore, in the initial state, the opening and closing plate is in the open state, and when the closing arc plate rotates, the opening and closing plate is in the closed state.

[0014] Furthermore, a connecting pipe is provided at the lower end of the buffer box, the lower end of which is connected to the hydraulic pump, and the upper end of which is connected to the second chamber.

[0015] The beneficial effects of this invention are:

[0016] By incorporating a flexible component, when the telescopic rod is impacted, the pin at its front end is impacted first. When the impact force exceeds the working pressure, the pin, under the action of the impact force, drives the trigger rod to slide inside the bearing cylinder. During the sliding process, the pin drives the closed arc plate to rotate, thereby sealing the inlet pipe and connecting the spare outlet pipe to the inside of the cylinder. When the pin moves to a certain distance, the impact force will act on the inside of the telescopic rod. At this time, the high pressure generated by the piston on the hydraulic oil through the telescopic rod will not directly act on the inside of the hydraulic cylinder, thus effectively protecting the internal structure of the hydraulic cylinder when impacted.

[0017] By incorporating a buffer component, when the telescopic rod is subjected to impact, the pressurized hydraulic oil enters the buffer tank through a conduit to release pressure inside the cylinder. The hydraulic oil entering the buffer tank reduces and buffers the impact force on the telescopic rod, preventing damage to the telescopic rod and affecting subsequent use. At the same time, the hydraulic oil entering the buffer tank can be recycled, effectively reducing the cost during use.

[0018] By setting up a variable component, when the cylinder body is connected to the first chamber, the first chamber and the second chamber are no longer connected. Because the connecting pipe is connected to the hydraulic pump, the opening and closing plate can effectively prevent hydraulic oil from directly entering the hydraulic pump and damaging its internal structure. When the impact force is eliminated, when the cylinder body is no longer connected to the first chamber, the first chamber and the second chamber are connected to each other through the opening and closing plate, thereby ensuring that the hydraulic oil inside the first chamber can enter the second chamber and be collected by the hydraulic pump. Attached Figure Description

[0019] Figure 1 This is a first-view three-dimensional structural diagram of the present invention;

[0020] Figure 2 This is a second-view three-dimensional structural diagram of the present invention;

[0021] Figure 3 This is a schematic diagram of the internal structure of the cylinder block of the present invention;

[0022] Figure 4 This is a schematic diagram of the impact-resistant unit structure of the present invention;

[0023] Figure 5 This is a schematic diagram of the internal structure of the bearing cylinder of the present invention;

[0024] Figure 6 This is a schematic diagram of the structure of the adaptable component of the present invention;

[0025] Figure 7 This is a schematic diagram of the internal structure of the buffer box of the present invention.

[0026] In the picture:

[0027] 1. Cylinder body; 2. Hinge rod; 3. Telescopic rod; 4. Piston; 5. Inlet pipe; 101. Extension plate; 102. Bearing cylinder; 103. Trigger rod; 104. Limiting rod; 105. Leaf spring; 106. Connecting plate; 107. Pin; 201. Spiral groove; 202. Rotating plate; 203. Connecting plate; 204. Closed arc plate; 205. Protruding rod; 301. Buffer tank; 302. Outlet pipe; 303. Isolation plate; 304. First chamber; 305. Second chamber; 306. Rotating shaft; 307. Opening and closing plate; 401. Shaft; 402. Rotating wheel; 403. Connecting pipe. Detailed Implementation

[0028] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0029] Example 1, referring to Figures 1-6 The first embodiment of the present invention provides an impact-resistant hydraulic cylinder for mining machinery, including a cylinder body 1 and a hydraulic pump, a hinge rod 2 hinged to the upper end of the cylinder body 1, a telescopic rod 3 slidably installed inside the cylinder body 1, a piston 4 fixedly installed on the outer wall of the telescopic rod 3, and inlet pipes 5 fixedly installed at both ends of the cylinder body 1. Both inlet pipes 5 are connected to the hydraulic pump. The cylinder body 1 also includes an anti-impact unit installed inside the telescopic rod 3. The anti-impact unit includes a flexible component installed between the telescopic rod 3 and the cylinder body 1 and a buffer component on the outer wall of the cylinder body 1.

[0030] The flexible components include an extension disc 101 rotatably mounted on the inner bottom wall of the telescopic rod 3, with the other end of the extension disc 101 rotatably connected to the inner wall of the cylinder 1. The extension disc 101 is fixedly mounted between the cylinder 1 and the telescopic rod 3. When the telescopic rod 3 moves horizontally under the thrust of the piston 4, the extension disc 101 extends to ensure that one end of the telescopic rod 3 is always connected to the cylinder 1, thus paving the way for the subsequent rotating assembly. A bearing cylinder 102 is rotatably mounted on the side wall of the extension disc 101. A trigger rod 103 is slidably mounted inside the bearing cylinder 102. A limiting rod 104 is fixedly mounted on the outer wall of the trigger rod 103. A limiting groove is formed on the inner wall of the bearing cylinder 102. The limiting rod 104 is slidably mounted in the limiting groove. A leaf spring 105 is fixedly mounted between the side walls of the extension disc 101 and the trigger rod 103. A connecting disc 106 is fixedly mounted on one end of the trigger rod 103. A pin 107 is fixedly mounted on the side wall of the connecting disc 106. A rotating assembly is mounted on the trigger rod 103.

[0031] Reference Figure 2 and Figure 3 The rotating assembly includes a spiral groove 201 formed on the outer wall of the trigger rod 103, a protruding rod 205 fixedly installed on the inner wall of the telescopic rod 3, one end of the protruding rod 205 located in the spiral groove 201, a rotating disk 202 rotatably installed on the outer wall of the extension disk 101, a connecting plate 203 fixedly installed on the outer wall of the rotating disk 202, and a closed arc plate 204 fixedly installed on the outer wall of the connecting plate 203. The end face of the closed arc plate 204 is not a complete circle. In the initial state, the incomplete area of ​​the closed arc plate 204 is located directly above the liquid inlet pipe 5.

[0032] Specifically, the pin 107 is used to connect the mechanical structure. By controlling the telescopic rod 3 inside the hydraulic cylinder, the mechanical structure in front is controlled. When the mechanical structure is subjected to a strong impact force, the impact force first acts on the front end of the pin 107. The limit rod 104 is fixedly installed on the trigger rod 103, so that the trigger rod 103 can slide freely in the horizontal direction inside the bearing cylinder 102. During the rotation of the trigger rod 103, it can drive the lower bearing cylinder 102 to rotate synchronously. The working principle of the variable component is: when the front end of the pin 107 is subjected to a load exceeding the working load of the hydraulic cylinder, because the pin 107 is located at the front end, the impact force first acts directly on the pin. On pin 107, the impact force received by pin 107 is transmitted to leaf spring 105 at one end through trigger rod 103, thereby triggering the rotating assembly. Originally, the hydraulic pump and the cylinder 1 are interconnected. In order to prevent the hydraulic oil inside the cylinder 1 from being pressurized and directly backflowing into the hydraulic pump and damaging its parts, after the rotating assembly is triggered, the sealing arc plate 204 rotates to seal the inlet pipe 5, so as to prevent high-pressure hydraulic oil from entering the hydraulic pump through the inlet pipe 5. However, the energy inside the hydraulic cylinder after being subjected to high pressure needs to be released to prevent the telescopic rod 3 from directly bearing the pressure alone and thus causing damage to the telescopic rod 3. Therefore, the pressure inside the hydraulic cylinder is released through the buffer component.

[0033] The extension disc 101 is composed of multiple slidingly connected connecting cylinders. Its purpose is to ensure that even when the telescopic rod 3 slides inside the cylinder body 1, the extension disc 101 extends synchronously with the telescopic rod 3 to maintain the connection between the telescopic rod 3 and the cylinder body 1. When the pin 107 at the front end of the telescopic rod 3 experiences a high impact force, the impact force is transmitted to the leaf spring 105 through the trigger rod 103. The leaf spring 105 is made of high-strength alloy, and it will only deform when the force it receives is large enough. Therefore, by reasonably setting the parameters of the leaf spring 105, when the front end of the pin 107 is subjected to an impact force exceeding the working pressure, the leaf spring 105 deforms first (at this time, the impact force acts directly on the pin 107 and the leaf spring 105, rather than extending). On the telescopic rod 3, the impact force will only act on the telescopic rod 3 after the leaf spring 105 is fully compressed. During the deformation of the leaf spring 105, the protruding rod 205 and the spiral groove 201 cooperate with each other, so that the trigger rod 103 deflects 90° during the horizontal movement under the impact force, thereby driving the closed arc plate 204 to rotate synchronously. When the closed arc plate 204 rotates 90°, the original incomplete area is located directly above the liquid inlet pipe 5. After rotating 90°, the incomplete area is located in the buffer component area. After the following changes are completed, when the telescopic rod 3 continues to be subjected to subsequent impact force, the high-pressure hydraulic oil inside it will directly enter the buffer component, thereby depressurizing its interior to ensure that the hydraulic cylinder can withstand sudden impact force during operation.

[0034] During use, a mechanical structure is hinged to the pin 107 of the hydraulic cylinder. When the mechanical structure encounters a large impact force during operation, the impact force is directly transmitted to the pin 107 through the mechanical structure, and then acts on the trigger rod 103 inside the telescopic rod 3 through the pin 107. When the impact force is greater than the working negative pressure, the leaf spring 105 is compressed, and the trigger rod 103 undergoes a certain horizontal movement inside the telescopic rod 3. During the movement of the trigger rod 103, the convex rod 205 and its own spiral groove 201 cooperate with each other, so that the convex rod 205 acts on the trigger rod 103. 03 generates thrust, causing the trigger rod 103 to deflect during its movement. As the trigger rod 103 rotates, the lower bearing cylinder 102 rotates synchronously via the limit rod 104. During the rotation of the bearing cylinder 102, the outer rotating disk 202 and connecting plate 203 rotate synchronously via the extension disk 101, simultaneously causing the outermost closed arc plate 204 to rotate synchronously. By appropriately setting the length and curvature of the spiral groove 201, the closed arc plate 204 deflects 90° when the trigger rod 103 reaches its maximum position. When the closed arc plate 204 rotates 90°, its previously incomplete area, located above the inlet pipe 5, is now positioned at 90° to the end face of the inlet pipe 5, thus completing the isolation and separation between the interior of the cylinder 1 and the interior of the inlet pipe 5.

[0035] Example 2, refer to Figures 6-7 This is the second embodiment of the present invention, which differs from the first embodiment in that: the buffer component includes a buffer tank 301 fixedly installed on the outer wall of the cylinder 1, and a spare liquid outlet pipe 302 fixedly installed on the outer wall of the cylinder 1. The end face angle between the spare liquid outlet pipe 302 and the corresponding liquid inlet pipe 5 is 90°, and the end of the spare liquid outlet pipe 302 away from the cylinder 1 is connected to the interior of the buffer tank 301. An isolation plate 303 is fixedly installed inside the buffer tank 301, dividing the buffer tank 301 into two areas. The area close to the liquid inlet pipe 5 is the first chamber 304, and the other area is the second chamber 305. A variable component is installed on the isolation plate 303. A connecting pipe 403 is provided at the lower end of the buffer tank 301. The lower end of the connecting pipe 403 is connected to the hydraulic pump, and the upper end of the connecting pipe 403 is connected to the second chamber 305.

[0036] Specifically, the buffer tank 301 is used to relieve pressure inside the cylinder 1, the bypass component is used to protect the hydraulic pump to prevent high-pressure hydraulic oil from directly entering the hydraulic pump and damaging its internal structure, and the buffer component is used to relieve pressure inside the cylinder 1. The two work together to ensure that the hydraulic cylinder can withstand high impact forces. The spare outlet pipe 302 is used to relieve pressure on the hydraulic oil inside the cylinder 1. When the sealing arc plate 204 rotates to block the inlet pipe 5, the sealing arc plate 204 will open the spare outlet pipe 302, so that the high-pressure hydraulic oil will not enter the hydraulic pump but will enter the buffer tank 301.

[0037] The working principle of the buffer component is as follows: The buffer tank 301 is used to relieve the pressure inside the cylinder 1. When subjected to high impact, the variable component closes the inlet pipe 5, preventing the hydraulic oil inside the cylinder 1 from being discharged. The internal pressure is relatively high. If it cannot be discharged in time, the cylinder 1 will be subjected to pressure, which may lead to cylinder explosion or breakage of the telescopic rod 3. Therefore, by setting up the buffer component, when the inlet pipe 5 is closed, the spare outlet pipe 302 can discharge the high-pressure hydraulic oil inside into the buffer tank 301 to relieve the pressure inside the cylinder 1, protect the hydraulic cylinder, and improve the overall impact resistance. An isolation plate 303 is installed to divide the buffer tank 301 into a first chamber 304 and a second chamber 305. The two chambers serve as a bridge between the cylinder 1 and the hydraulic pump. When the buffer tank 301 is working, the first chamber 304 is connected to the cylinder 1 but not to the second chamber 305 to prevent hydraulic oil entering the buffer tank 301 from directly entering the hydraulic pump and damaging its structure. After the pressure is released, the first chamber 304 is no longer connected to the cylinder 1, and then it is connected to the second chamber 305. The collected hydraulic oil is then recycled back to the hydraulic pump through the connecting pipe 403 at the upper end of the second chamber 305 for subsequent reuse.

[0038] The remaining structure is the same as that in Example 1.

[0039] Example 3, referring to Figure 7 This is the third embodiment of the present invention, which differs from the second embodiment in that: the modified component includes a circular groove formed on the upper end of the isolation plate 303, a rotating shaft 306 rotatably mounted on the side wall of the isolation plate 303, and an opening / closing plate 307 fixedly mounted on the outer wall of the rotating shaft 306. The end face shape of the opening / closing plate 307 is the same as the end face shape of the circular groove. A triggering element is installed on the corresponding liquid inlet pipe 5. The triggering element includes a shaft 401 rotatably mounted on the upper end of the liquid inlet pipe 5, a rotating wheel 402 fixedly mounted on the upper end of the shaft 401, and a rubber ring sleeved on the surface of the rotating wheel 402. The rotating wheel 402 is in close contact with the surface of the closed arc plate 204. Both ends of the shaft 401 and the rotating shaft 306 are connected to each other by a gear set. In the initial state, the opening / closing plate 307 is in the open state. When the closed arc plate 204 rotates, the opening / closing plate 307 is in the closed state.

[0040] Specifically, the function of the variable component is to prevent high-pressure hydraulic oil from entering the buffer tank 301 and directly entering the hydraulic pump through the lower connecting pipe 403, which could damage the hydraulic pump. Therefore, when the spare outlet pipe 302 is connected to the first chamber 304, the first chamber 304 and the second chamber 305 are closed by the opening and closing plate 307, allowing high-pressure hydraulic oil to directly enter the first chamber 304. After the pressure is released, the sealing arc plate 204 is reset, and the spare outlet pipe 302 is in a closed state. At this time, the first chamber 304 and the second chamber 305 are connected to each other through the circular groove, and the hydraulic oil inside can enter the hydraulic pump for secondary use.

[0041] The trigger element is used to control the opening and closing plate 307. Under normal conditions, the opening and closing plate 307 is in the open state relative to the circular groove. When the spare liquid outlet pipe 302 is connected to the first chamber 304, the opening and closing plate 307 is in the closed state. The specific principle is as follows: During the rotation of the closing arc plate 204, friction occurs between the closing arc plate 204 and the rotating wheel 402. The rubber ring at the upper end of the closing arc plate 204 is used to increase the friction between the two. When the closing arc plate 204 rotates 90°, the rotating wheel 402 rotates 90° synchronously. The rotation of the rotating wheel 402 drives the rotating shaft 306 to rotate synchronously through the shaft 401 and the gear set. During the rotation of the rotating shaft 306, the opening and closing plate 307 rotates synchronously and blocks the circular groove to close the first chamber 304 and the second chamber 305. Only when the closing arc plate 204 is reset will the opening and closing plate 307 be reset synchronously. At this time, the first chamber 304 and the second chamber 305 are in a connected state.

[0042] During use, when the front end of the hydraulic cylinder is subjected to a large impact force, and the closed arc plate 204 rotates, the closed arc plate 204 drives the rotating wheel 402 to rotate through friction. The rotating wheel 402 drives the corresponding rotating shaft 306 to rotate synchronously through the shaft 401 and gear set. During the rotation of the rotating shaft 306, the opening and closing plate 307 rotates synchronously, sealing the circular groove. At this time, the first chamber 304 and the second chamber 305 are in a closed state. Because the inlet pipe 5 is closed by the closed arc plate 204, the high-pressure hydraulic oil inside the cylinder 1 enters the first chamber 304 and depressurizes the inside of the cylinder 1, thereby helping the hydraulic cylinder complete this impact. Upon impact, once the impact force disappears, the trigger rod 103 quickly resets under the high elasticity of the leaf spring 105, thereby driving the closed arc plate 204 to rotate in the opposite direction and reset synchronously. At this time, the inlet pipe 5 is connected to the inside of the cylinder 1, and the spare outlet pipe 302 is no longer connected to the cylinder 1. Simultaneously, during the reset process of the closed arc plate 204, the closed arc plate 204 again drives the rotating wheel 402 to rotate in the opposite direction through friction. At this time, the first chamber 304 is no longer connected to the inside of the cylinder 1, but is connected to the second chamber 305. The hydraulic oil that has been depressurized in the first chamber 304 flows into the hydraulic pump through the connecting pipe 403 at the lower end of the second chamber 305 for subsequent use.

[0043] The remaining structure is the same as that in Example 2.

[0044] Based on embodiments 1-3, the working principle of the present invention is as follows: A mechanical structure is hinged to the pin 107 of the hydraulic cylinder. When the mechanical structure encounters a large impact force during operation, the impact force is directly transmitted to the pin 107 through the mechanical structure, and then acts on the trigger rod 103 inside the telescopic rod 3 through the pin 107. When the impact force is greater than the working negative pressure, the leaf spring 105 is compressed, and the trigger rod 103 undergoes a certain horizontal movement inside the telescopic rod 3. During the movement of the trigger rod 103, the convex rod 205 cooperates with its own spiral groove 201, so that the convex rod 205... 5. A thrust is generated on the trigger rod 103, causing it to deflect during its movement. As the trigger rod 103 rotates, the lower bearing cylinder 102 rotates synchronously via the limiting rod 104. During the rotation of the bearing cylinder 102, the outer rotating disk 202 and connecting plate 203 rotate synchronously via the extension disk 101, simultaneously causing the outermost closed arc plate 204 to rotate synchronously. By appropriately setting the length and curvature of the spiral groove 201, the closed arc plate 204 deflects 90° when the trigger rod 103 reaches its maximum position. When the closed arc plate 204 rotates 90°, its previously incomplete area, located above the inlet pipe 5, is now positioned at 90° to the end face of the inlet pipe 5, thus completing the isolation and separation between the interior of the cylinder 1 and the interior of the inlet pipe 5.

[0045] When the front end of the hydraulic cylinder is subjected to a large impact force, and the closed arc plate 204 rotates, the closed arc plate 204 drives the rotating wheel 402 to rotate through friction. The rotating wheel 402 drives the corresponding rotating shaft 306 to rotate synchronously through the shaft 401 and the gear set. During the rotation of the rotating shaft 306, the opening and closing plate 307 rotates synchronously to close the circular groove. At this time, the first chamber 304 and the second chamber 305 are in a closed state. Because the inlet pipe 5 is closed by the closed arc plate 204, the high-pressure hydraulic oil inside the cylinder 1 enters the first chamber 304 and depressurizes the inside of the cylinder 1, thereby helping the hydraulic cylinder to complete this impact force.

[0046] After the impact force disappears, the trigger rod 103 quickly resets under the high elasticity of the leaf spring 105, thereby driving the closed arc plate 204 to rotate in the opposite direction and reset synchronously. At this time, the inlet pipe 5 is connected to the inside of the cylinder 1, and the spare outlet pipe 302 is no longer connected to the cylinder 1. At the same time, during the reset process of the closed arc plate 204, the closed arc plate 204 once again drives the rotating wheel 402 to rotate in the opposite direction through friction. At this time, the first chamber 304 is no longer connected to the inside of the cylinder 1, but is connected to the second chamber 305. At this time, the hydraulic oil in the first chamber 304 after depressurization flows into the hydraulic pump through the connecting pipe 403 at the lower end of the second chamber 305 for subsequent use. At the same time, when the hydraulic oil is subjected to high impact force again in subsequent work, the above operation is repeated to avoid the impact of high impact force on the hydraulic cylinder.

[0047] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An impact-resistant hydraulic cylinder for mining machinery, comprising a cylinder body (1) and a hydraulic pump, a hinge rod (2) disposed at the upper end of the cylinder body (1), a telescopic rod (3) disposed inside the cylinder body (1), a piston (4) disposed on the outer wall of the telescopic rod (3), and inlet pipes (5) disposed at both ends of the cylinder body (1), wherein both inlet pipes (5) are interconnected with the hydraulic pump, characterized in that, It also includes an anti-impact unit disposed inside the telescopic rod (3), the anti-impact unit including a flexible component disposed between the telescopic rod (3) and the cylinder (1) and a buffer component on the outer wall of the cylinder (1); The adaptable component includes an extension disc (101) disposed on the inner bottom wall of the telescopic rod (3), the other end of the extension disc (101) being fixedly connected to the inner wall of the cylinder (1), a bearing cylinder (102) rotatably disposed on the side wall of the extension disc (101), a trigger rod (103) slidably disposed inside the bearing cylinder (102), a limiting rod (104) disposed on the outer wall of the trigger rod (103), a limiting groove opened on the inner wall of the bearing cylinder (102), the limiting rod (104) being slidably installed in the limiting groove, a leaf spring (105) disposed between the side wall of the extension disc (101) and the trigger rod (103), a connecting disc (106) disposed at one end of the trigger rod (103), a pin (107) disposed on the side wall of the connecting disc (106), and a rotating assembly disposed on the trigger rod (103). The rotating assembly includes a spiral groove (201) on the outer wall of the trigger rod (103), a protruding rod (205) on the inner wall of the telescopic rod (3), one end of the protruding rod (205) being located in the spiral groove (201), a rotating disk (202) on the outer wall of the extension disk (101), a connecting plate (203) on the outer wall of the rotating disk (202), and a closed arc plate (204) on the outer wall of the connecting plate (203). The end face of the closed arc plate (204) is an incomplete circle. In the initial state, the incomplete area of ​​the closed arc plate (204) is located directly above the liquid inlet pipe (5).

2. The impact-resistant hydraulic cylinder for mining machinery according to claim 1, characterized in that, The buffer component includes a buffer box (301) disposed on the outer wall of the cylinder (1) and a spare liquid outlet pipe (302) disposed on the outer wall of the cylinder (1). The end face angle between the spare liquid outlet pipe (302) and the corresponding liquid inlet pipe (5) is 90°. The end of the spare liquid outlet pipe (302) away from the cylinder (1) is connected to the interior of the buffer box (301).

3. The impact-resistant hydraulic cylinder for mining machinery according to claim 2, characterized in that, The buffer box (301) is provided with an isolation plate (303) inside. The isolation plate (303) divides the buffer box (301) into two areas. One area close to the liquid inlet pipe (5) is the first chamber (304), and the other area is the second chamber (305). The isolation plate (303) is provided with a change component.

4. The impact-resistant hydraulic cylinder for mining machinery according to claim 3, characterized in that, The variable component includes a circular groove on the upper end of the isolation plate (303), a rotating shaft (306) on the side wall of the isolation plate (303), and an opening and closing plate (307) on the outer wall of the rotating shaft (306). The end face shape of the opening and closing plate (307) is the same as the end face shape of the circular groove, and a triggering element is installed on the corresponding liquid inlet pipe (5).

5. The impact-resistant hydraulic cylinder for mining machinery according to claim 4, characterized in that, The triggering element includes a shaft (401) set at the upper end of the inlet pipe (5), a rotating wheel (402) set at the upper end of the shaft (401), and a rubber ring set on the surface of the rotating wheel (402). The rotating wheel (402) and the surface of the closed arc plate (204) are in close contact with each other. Both ends of the shaft (401) and the rotating shaft (306) are connected by gear sets for mutual transmission.

6. The impact-resistant hydraulic cylinder for mining machinery according to claim 5, characterized in that, In the initial state, the opening and closing plate (307) is in the open state. When the closing arc plate (204) rotates, the opening and closing plate (307) is in the closed state.

7. The impact-resistant hydraulic cylinder for mining machinery according to claim 6, characterized in that, The lower end of the buffer box (301) is provided with a connecting pipe (403), the lower end of the connecting pipe (403) is connected to the hydraulic pump, and the upper end of the connecting pipe (403) is connected to the second chamber (305).

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