Double impact resistant hydraulic cylinder device and method

Abstract

The present invention provides a double impact-resistant hydraulic cylinder device and method, which relates to the technical field of pressure actuators. It includes a guide sleeve, an outer cylinder body, a static piston, a limit end cover, a base, an inner column sleeve, a friction plate, a safety pin and an elastic energy absorption structure. The outer cylinder body is arranged on the base, the elastic energy absorption structure is arranged in the cylinder body, the limit end cover is pressed on the elastic energy absorption structure, the limit rod on the base is plugged and fixed with the static piston through the safety pin, the end of the inner column piston is connected to the friction plate, the inner column sleeve is plugged and fixed with the outer cylinder body, and the guide sleeve is arranged at the port of the outer cylinder body. When the device is subjected to an impact load for the second time, the friction force at the connection between the friction plate and the inner column piston will not be sufficient to support its static connection, and the inner column sleeve and the friction plate move downward relative to the inner column piston to achieve the purpose of buffering and unloading pressure, and the flange at the lower end of the inner column sleeve ensures that the stroke of the inner column will not change. The buffering and unloading method of this structure can be used for a variety of impact load conditions, and its operation is stable and reliable.

Description

Technical Field

[0001] The invention relates to the technical field of pressure actuators, and in particular to a double impact-resistant hydraulic cylinder device and method. Background Art

[0002] The hydraulic cylinder device of construction machinery is an important component of the entire hydraulic system. As an important component in the support structure, the hydraulic cylinder device is widely used, especially in lanes, tunnels, drilling rigs, working faces and other locations.

[0003] Impact load is a load that acts on a component at a high speed in a very short time. The calculation of its stress and deformation is quite complicated. Support equipment with hydraulic devices will fail if subjected to frequent or accidental impact loads, thus threatening construction safety. Instantaneous impact loads require high impact resistance of hydraulic cylinder devices.

[0004] In the prior art, in order to ensure the impact resistance of the hydraulic cylinder device, improvements are mostly made from the matching parts of the safety valve device and the support structure. However, the safety valve device has a certain hysteresis when dealing with impact loads, and the valve parts are also prone to damage under short-term overload conditions. Improvements to the matching parts of the support structure often complicate the external structure of the hydraulic device, and the buffering effect of the mechanical parts is limited, and it cannot cope with the situation of secondary impact loads. In addition, in actual engineering, impact loads often occur multiple times, irregularly, and repeatedly. The improvements to the existing equipment cannot cope with secondary impact loads, and cannot restore the original support state after being subjected to impact loads, which leads to failure of the hydraulic cylinder device and affects support safety. Summary of the invention

[0005] In order to provide a safe, effective, stable and reliable hydraulic cylinder device and ensure the normal operation of the hydraulic cylinder device under an impact load environment, especially to cope with secondary impact loads, the present invention provides a double impact-resistant hydraulic cylinder device and method, and the specific technical solution is as follows.

[0006] A double impact-resistant hydraulic cylinder device comprises a guide sleeve, an outer cylinder body, a normally static piston, a limit end cover, a base, an inner column sleeve, a friction plate, a safety pin and an elastic energy absorbing structure, wherein the outer cylinder body is arranged on the base, the elastic energy absorbing structure is arranged in the cylinder body, and the limit end cover is pressed on the elastic energy absorbing structure; the limit rod on the base is plugged and fixed to the normally static piston by the safety pin, the end of the inner column piston is connected to the friction plate, the inner column sleeve is plugged and fixed to the outer cylinder body, and the guide sleeve is arranged at the port of the outer cylinder body.

[0007] Preferably, a friction plate is provided in the inner column sleeve, the inner column piston is plugged into the inner column sleeve, a guide column is provided in the inner column piston, and the guide column is connected to the inner column piston through a guide column limit pin.

[0008] Preferably, a first through hole and a second through hole are provided on the guide column, and the first through hole and the second through hole cooperate with two pressure relief holes on the inner column piston.

[0009] Preferably, a boss is provided at the end of the inner column sleeve, and the safety pin moves along the inner wall of the outer cylinder body after the hydraulic cylinder device fails due to an impact load.

[0010] Preferably, the elastic energy absorbing structure is a spring, a rubber column or a disc spring, and the elastic force of the elastic energy absorbing structure pushes the normally static piston to the normal pressure position.

[0011] Preferably, the inner column piston moves in the upper cavity, and a lower cavity is formed below the normally static piston.

[0012] A double impact-resistant hydraulic cylinder working method utilizes the above-mentioned double impact-resistant hydraulic cylinder device, including an inner column sleeve and a liquid seal in an inner column piston, and a friction plate fixedly connected to the inner column piston; when the hydraulic cylinder device is subjected to an impact load and the safety valve unloading flow is overloaded, the safety pin breaks under the impact load, and the static piston presses down the elastic energy-absorbing structure.

[0013] It is further preferred that the normally static piston is pressed down to the limit position, the hydraulic pressure in the lower cavity is discharged, the guide column is lifted up under the action of pressure, the first through hole and the second through hole on the guide column cooperate with the two pressure relief holes on the inner column piston, and the closed cavity of the inner column piston is connected with the upper cavity.

[0014] It is further preferred that when the hydraulic cylinder device is subjected to impact load again, friction is generated between the friction plate and the inner column piston, and the inner column sleeve slowly descends.

[0015] It is further preferred that when the impact load on the hydraulic cylinder device disappears, the elastic force of the elastic energy-absorbing structure pushes the normally static piston to a normal pressure position.

[0016] The beneficial effect of a dual impact-resistant hydraulic cylinder device and method provided by the present invention is that the device is provided with a normally static piston to cope with different situations between normal pressure state and impact load. After the hydraulic cylinder device is subjected to impact load, the normally static piston presses down the elastic energy-absorbing structure to buffer and absorb energy. After being subjected to the impact load, the inner column piston frictionally descends and buffers again, thereby ensuring the hydraulic device's ability to resist impact loads. At the same time, after the impact load disappears, the elastic energy-absorbing structure resets the normally static piston, thereby ensuring the continuous supporting effect of the hydraulic device. In addition, the device and working method also have the advantages of safety, effectiveness, wide range of application, stable and reliable operation, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the internal structure of a double impact-resistant hydraulic cylinder device;

[0018] Figure 2 yes Figure 1 A magnified view of position A in the middle;

[0019] Figure 3 It is a normal pressure state diagram of a double impact-resistant hydraulic cylinder device;

[0020] Figure 4 It is a diagram of the compression state of the double impact-resistant hydraulic cylinder device when it is initially subjected to impact load;

[0021] Figure 5 It is a diagram of the compression state of a double impact-resistant hydraulic cylinder device subjected to an impact load again;

[0022] In the figure: 1-guide sleeve, 2-outer cylinder body, 3-normally static piston, 4-limiting end cover, 5-base, 6-inner column sleeve, 7-friction plate, 8-safety pin, 9-elastic energy absorption structure, 10-column spring, 11-inner column piston, 12-guide column, 13-guide column limiting pin, 14-first through hole, 15-second through hole. DETAILED DESCRIPTION

[0023] Combination Figures 1 to 5 As shown, a specific implementation manner of a double impact-resistant hydraulic cylinder device and method provided by the present invention is described.

[0024] A double impact-resistant hydraulic cylinder device specifically includes a guide sleeve 1, an outer cylinder body 2, a normally static piston 3, a limit end cover 4, a base 5, an inner column sleeve 6, a friction plate 7, a safety pin 8 and an elastic energy absorption structure 9. The outer cylinder body 2 and the inner column sleeve 6 cooperate with telescopic support. The normally static piston 3 is at a set position in a normal pressure state. After receiving an impact load, it presses down the elastic energy absorption structure. The elastic energy absorption structure 9 buffers the initial impact load. The combination of the friction plate 7 and the guide column 12 and other structures buffers the impact load received again. The outer cylinder body 2 is arranged on the base, and the outer cylinder body 2 and the base 5 are fixedly connected. The base 5 wraps and seals the bottom of the outer cylinder body. The elastic energy absorption structure 9 is arranged in the cylinder body and sleeved on the limit rod of the base 5. The limit end cover 4 is pressed on the elastic energy absorption structure 9. After being pressed, the limit end cover 4 compresses the elastic energy absorption structure, and the limit end cover 4 slides along the limit rod. The limit rod on the base 5 is plugged and fixed with the static piston 3 through a safety pin, specifically, the lower end of the static piston 3 is fixed with the upper end of the limit rod through a safety pin 8. The end of the inner column piston 11 is connected to the friction plate 7, the inner column sleeve 6 is plugged and fixed with the outer cylinder body 2, and the guide sleeve is arranged at the port of the outer cylinder body 2, which facilitates the movement of the inner column sleeve 6 along the outer cylinder body and also has the function of sealing the internal cavity of the outer cylinder body 2.

[0025] The inner column sleeve 6 is provided with a friction plate 7, and the tip of the inner column piston 11 is clamped in the friction plate 7. The inner column sleeve 6, the friction plate 7 and the inner column piston 11 are fixedly connected under the action of friction. The inner column piston 11 is plug-fitted with the inner column sleeve, and a guide column 12 is provided in the inner column piston 11. The guide column 12 is connected to the inner column piston through a guide column limit pin. The guide column 12 is provided with a first through hole 14 and a second through hole 15, and the first through hole 14 and the second through hole 15 cooperate with the two pressure relief holes on the inner column piston. When the static piston 3 is pressed down to the limit position, the hydraulic pressure in the lower cavity is discharged, and the guide column 12 is lifted up under the action of pressure. The first through hole 14 and the second through hole 15 on the guide column 12 cooperate with the two pressure relief holes on the inner column piston, and the closed cavity of the inner column piston 11 is connected with the upper cavity.

[0026] The end of the inner column sleeve 6 is provided with a boss to ensure that the stroke of the inner column sleeve is fixed. After the safety pin 8 fails due to the impact load of the hydraulic cylinder device, the normally static piston 3 moves along the inner wall of the outer cylinder. The inner column piston 11 moves in the upper cavity, and a lower cavity is formed below the normally static piston 3. The lower part of the normally static piston 3 is a hollow structure, and the limit rod can cooperate to insert into the hollow structure at the lower part of the normally static piston after the safety pin 8 is damaged by pressure.

[0027] The elastic energy absorbing structure 9 is a spring, a rubber column or a disc spring. The elastic force of the elastic energy absorbing structure 9 pushes the static piston to the normal pressure position. The limit end cover 4 presses the elastic energy absorbing structure and moves slowly downward, and the lower chamber of the hydraulic cylinder device expands. When the load tends to be stable, the elastic energy absorbing structure 9 pushes the static piston 3 back to a relatively normal level.

[0028] A double impact-resistant hydraulic cylinder working method utilizes the above-mentioned double impact-resistant hydraulic cylinder device, including an inner column sleeve and a liquid seal in an inner column piston, and a friction plate fixedly connected to the inner column piston; when the hydraulic cylinder device is subjected to an impact load and the safety valve unloading flow is overloaded, the safety pin breaks under the impact load, and the static piston presses down the elastic energy-absorbing structure.

[0029] Specifically, during normal operation, the normally static piston is fixedly connected to the limit rod on the base by a safety pin, the guide column is pushed to the lowest position by the column spring, and the guide column limit pin limits its position. The inner column sleeve, friction plate and inner column piston are fixedly connected under the action of friction and can freely expand and contract above the normally static piston. When the inner column sleeve is subjected to an instantaneous impact load that is too strong, the safety pin connected to the normally static piston is broken, and the normally static piston moves downward along the limit rod, and slowly moves downward through the limit end cover to compress the elastic energy absorbing structure, and the lower chamber of the hydraulic cylinder expands. When the load tends to stabilize, the elastic structure pushes the normally static piston back to a more normal level. When the emulsion in the lower chamber of the hydraulic cylinder is emptied, the upper through hole of the inner column piston is connected with the upper through hole of the guide column, and the lower through holes of the two are also connected at the same time. At this time, the internal liquid chamber of the inner column sleeve and the inner column piston is connected with the upper chamber of the hydraulic cylinder. If it is subjected to impact load again, the friction force at the connection between the friction plate and the inner column piston will not be sufficient to support its static connection. The inner column sleeve and the friction plate move downward relative to the inner column piston to achieve the purpose of buffering and pressure relief. The flange at the lower end of the inner column sleeve ensures that the stroke of the inner column will not change.

[0030] The normally static piston is pressed down to the limit position, the hydraulic pressure in the lower cavity is discharged, the guide column is lifted up under the pressure, the first through hole and the second through hole on the guide column cooperate with the two pressure relief holes on the inner column piston, and the closed cavity of the inner column piston is connected with the upper cavity. When the hydraulic cylinder device is subjected to impact load again, the friction plate and the inner column piston produce friction, and the inner column sleeve slowly descends. When the impact load on the hydraulic cylinder device disappears, the elastic force of the elastic energy absorption structure pushes the normally static piston to the normal pressure position.

[0031] Under normal working conditions, the inner column sleeve and the liquid in the inner column piston are sealed, and the friction plate is fixedly connected to the inner column piston. At this time, the column works as a normal single-cylinder hydraulic mechanism. Figure 3 shown.

[0032] When the column is subjected to a strong impact load, the safety valve unloading flow is insufficient to maintain the safe operation of the column. The safety pin breaks under the impact force, and the static piston moves downward. While the hydraulic chamber is expanding and buffering, the safety valve continues to unload. Figure 4 shown.

[0033] When the static piston drops to the bottom and all the liquid in the cylinder is discharged, the guide column is lifted up under the action of pressure, and the first through hole and the second through hole on the guide column are connected with the pressure relief hole on the inner column piston, and the closed inner cavity in the inner column is connected with the upper cavity of the hydraulic cylinder. If the column is subjected to impact load again, the friction connection between the friction plate and the inner column piston will be activated, and the inner column sleeve will slowly drop to reduce the impact. Figure 5 When the safety pin is damaged and the static piston descends, if the impact load disappears, the elastic energy absorption mechanism at the bottom of the column will push the static piston back to maintain the normal working of the column.

[0034] The device is provided with a normally static piston to cope with different situations between normal pressure state and impact load. After the hydraulic cylinder device is subjected to impact load, the normally static piston presses down the elastic energy absorption structure to buffer and absorb energy. After the impact load, the inner column piston frictionally descends and buffers again, thereby ensuring the hydraulic device's ability to resist impact loads. At the same time, after the impact load disappears, the elastic energy absorption structure resets the normally static piston, thereby ensuring the continuous support of the hydraulic device. In addition, this method has the advantages of safety, effectiveness, wide application range, stable and reliable operation, etc.

[0035] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A double impact resistant hydraulic cylinder device, characterized in that: It includes a guide sleeve, an outer cylinder body, a static piston, a limit end cover, a base, an inner column sleeve, a friction plate, a safety pin and an elastic energy absorbing structure. The outer cylinder body is arranged on the base, the elastic energy absorbing structure is arranged in the cylinder body, and the limit end cover is pressed on the elastic energy absorbing structure; the limit rod on the base is plugged and fixed with the static piston through the safety pin, the end of the inner column piston is connected with the friction plate, the inner column sleeve is plugged and fixed with the outer cylinder body, and the guide sleeve is arranged at the port of the outer cylinder body; The inner column sleeve is provided with a friction plate, the inner column piston is plugged and matched with the inner column sleeve, a guide column is provided in the inner column piston, and the guide column is connected to the inner column piston through a guide column limit pin; The guide column is provided with a first through hole and a second through hole, and the first through hole and the second through hole match with two pressure relief holes on the inner column piston.

2. A double impact resistant hydraulic cylinder device according to claim 1, characterized in that: A boss is provided at the end of the inner column sleeve. After the hydraulic cylinder device fails due to an impact load, the safety pin moves along the inner wall of the outer cylinder body.

3. A double impact resistant hydraulic cylinder device according to claim 1, characterized in that: The elastic energy absorbing structure is a spring, a rubber column or a disc spring, and the elastic force of the elastic energy absorbing structure pushes the normally static piston to the normal pressure position.

4. A double impact resistant hydraulic cylinder device according to claim 1, characterized in that: The inner column piston moves in the upper cavity, and a lower cavity is formed below the static piston.

5. A method for operating a double impact-resistant hydraulic cylinder, using a double impact-resistant hydraulic cylinder device according to any one of claims 1 to 4, characterized in that: It includes a liquid seal between the inner column sleeve and the inner column piston, and a fixed connection between the friction plate and the inner column piston; when the hydraulic cylinder device is subjected to an impact load and the safety valve unloading flow is overloaded, the safety pin breaks under the impact load, and the static piston presses down the elastic energy absorption structure.

6. A double impact resistant hydraulic cylinder working method according to claim 5, characterized in that: The normally static piston is pressed down to the limit position, the hydraulic pressure in the lower cavity is discharged, the guide column is lifted up under the action of pressure, the first through hole and the second through hole on the guide column cooperate with the two pressure relief holes on the inner column piston, and the closed cavity of the inner column piston is connected with the upper cavity.

7. A double impact resistant hydraulic cylinder working method according to claim 6, characterized in that: When the hydraulic cylinder device is subjected to impact load again, friction occurs between the friction plate and the inner column piston, causing the inner column sleeve to slowly descend.

8. A double impact resistant hydraulic cylinder operating method according to claim 6, characterized in that: When the impact load on the hydraulic cylinder device disappears, the elastic force of the elastic energy-absorbing structure pushes the normally static piston to the normal pressure position.

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