Oil cylinder pressure memory device

Abstract

The utility model discloses an oil cylinder pressure memory device, which relates to the technical field of oil cylinders and comprises a shell, a connector is arranged on the outer wall of the shell, and an end cover is arranged at the top of the shell. A transition cavity and an impact cavity are formed in the shell, the impact cavity is connected with an oil way of an oil cylinder, an impact rod in sealed sliding connection is arranged in the impact cavity, a spring is arranged in the transition cavity, the impact rod extends to the outer wall in the transition cavity to be connected with one end of the spring, and the other end of the spring is connected with the oil way of the oil cylinder. The other end of the spring is connected to the lower end face of the end cover. A retention rod in sealed sliding connection is arranged in the end cover, the lower end of the retention rod is located in the transition cavity and is in contact fit with the impact rod, a memory identification card is arranged at the upper end of the retention rod, and the memory identification card is located in the observation cavity. The memory identification card in the device can be maintained at the position during high-pressure impact, and the purpose of recording the pressure, exceeding the normal working pressure of product design, borne by the oil cylinder is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to oil cylinder technical field especially relates to an oil cylinder pressure memory device. BACKGROUND

[0002] In coal seam mining, hydraulic support is often used to support the working face, when the sudden main roof pressure occurs (i.e. the phenomenon of sudden large area collapse of main roof, usually accompanied by significant mine pressure change), the oil cylinder of the hydraulic support is impacted by super high pressure, resulting in oil cylinder damage and hydraulic support collapse.

[0003] At present, when the hydraulic pipeline is designed to prevent the sudden change of oil cylinder load and damage the function of the oil cylinder, a corresponding pressure regulating valve needs to be added in the oil circuit, usually a safety valve that can adjust a certain pressure is installed in the hydraulic pipeline connected with the oil cylinder to solve this problem. However, sometimes the safety valve cannot be normally opened to release pressure due to product quality or environmental pollution, thereby losing the protection of the oil cylinder and directly causing damage to the oil cylinder. The pressure gauge in the pipeline is also easily damaged. As an oil cylinder manufacturer, the system cannot obtain pressure data in the first time to indicate that the damage of the oil cylinder is caused by high pressure exceeding the design working pressure of the product, thereby causing great difficulty in accountability for after-sales accidents.

[0004] In summary, although the safety valve of the oil cylinder connecting oil circuit has unloading protection function, it cannot provide direct visual evidence of the overload damage of the oil cylinder, i.e. it cannot remember the overload of the oil cylinder exceeding the design working pressure of the product. INVENTION CONTENTS

[0005] The utility model aims at providing an oil cylinder pressure memory device to solve the problem that the oil cylinder cannot be memorized when it is subjected to the pressure exceeding the design working pressure of the product.

[0006] The utility model adopts the following technical scheme:

[0007] The utility model discloses an oil cylinder pressure memory device, which comprises a shell, a transition cavity and an impact cavity are sequentially arranged in the shell from top to bottom and are mutually penetrated, a joint is arranged on the outer wall of the shell corresponding to the impact cavity, the impact cavity is connected with the oil circuit of the oil cylinder, and a sealingly connected end cover is arranged at the top of the shell.

[0008] An impact rod in sealing sliding connection is arranged in the impact cavity, a spring is arranged in the transition cavity, the outer wall of the impact rod extending into the transition cavity is connected with one end of the spring, and the other end of the spring is connected to the lower end face of the end cover.

[0009] The end cover is internally provided with a retention rod in sealing sliding connection, the lower end of the retention rod is located in the transition cavity and is in contact with the impact rod, and the upper end of the retention rod is provided with a memory identification card, the memory identification card is located in an observation cavity, and the observation cavity is arranged at the top of the end cover.

[0010] Preferably, the waist of the impact rod is provided with a frustum, and the upper surface of the frustum is connected with one end of the spring.

[0011] The lower surface of the end cover is provided with a spring seat, and the other end of the spring is connected with the lower surface of the spring seat.

[0012] Preferably, the lower part of the retention rod is provided with a limiting platform, and the upper surface of the limiting platform is in limiting cooperation with the lower surface of the spring seat.

[0013] Preferably, the bottom surface of the transition cavity is provided with a sealing seat, and the sealing seat is in contact cooperation with the bottom surface of the frustum.

[0014] Preferably, the end cover comprises a gland, the gland is in sealing connection with the top of the shell, the gland is internally provided with a first sealing band, the retention cavity is arranged in the middle of the first sealing band, and the retention rod is in sealing sliding arrangement in the retention cavity.

[0015] The top of the gland is provided with the observation cavity, and the side wall of the observation cavity is provided with an observation hole through which the memory identification card can be observed.

[0016] Preferably, the gland is internally provided with a buckle cover, the buckle cover is provided with a second sealing band around the circumference, the buckle cover is in sealing connection with the gland through the second sealing band, the spring seat is fixedly arranged on the bottom surface of the buckle cover, and the first sealing band is arranged at the central position of the buckle cover.

[0017] Preferably, the top wall of the observation cavity is provided with a reset screw, the bottom end of the reset screw is in contact cooperation with the top end of the memory identification card, and the reset screw is threadedly connected to the top plate of the end cover.

[0018] Preferably, the memory identification card is provided with different color marks representing different pressures from top to bottom.

[0019] Preferably, the memory identification card is provided with different numerical scale lines representing different pressures from top to bottom.

[0020] Compared with the prior art, the beneficial technical effects of the utility model are as follows:

[0021] This device features a directly pluggable cylinder pressure memory system. This system includes a memory identification card. When high pressure is generated inside the cylinder, it pushes the impact rod and the retention rod, and the memory identification card maintains its position at the time of the high-pressure impact. This achieves the purpose of recording when the cylinder withstands pressure exceeding the product's design operating pressure. Furthermore, this device has the advantage of being reusable after a single installation. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings.

[0023] Figure 1 This is a schematic diagram of the structure of a hydraulic cylinder pressure memory device according to Embodiment 1 of this utility model;

[0024] Figure 2 This is a schematic diagram of the end cap structure of a hydraulic cylinder pressure memory device according to Embodiment 1 of this utility model;

[0025] Figure 3 This is a schematic diagram illustrating the installation effect of a hydraulic cylinder pressure memory device according to Embodiment 1 of this utility model;

[0026] Figure 4 This is a schematic diagram of the memory identification card in the hydraulic cylinder pressure memory device of this utility model in Embodiment 2.

[0027] Explanation of reference numerals in the attached drawings: 1. Housing; 2. Transition cavity; 2-1. Sealing seat; 3. Impact cavity; 4. Connector; 5. End cap; 5-1. Pressure cap; 5-2. First sealing strip; 5-3. Retention cavity; 5-4. Buckle cap; 5-5. Second sealing strip; 6. Impact rod; 6-1. Cone; 7. Spring; 8. Retention rod; 8-1. Limiting platform; 9. Memory identification card; 10. Observation cavity; 11. Spring seat; 10-1. Observation hole; 10-2. Reset screw. Detailed Implementation

[0028] To make the technical problems, technical solutions and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0029] Example 1

[0030] like Figure 1 As shown, this embodiment discloses a hydraulic cylinder pressure memory device, including a housing 1. The housing 1 has a transition cavity 2 and an impact cavity 3 arranged sequentially from top to bottom. The outer wall of the housing 1 corresponding to the impact cavity 3 is provided with a connector 4. During installation, the connector 4 can be directly inserted into the conventional oil circuit connector seat of the hydraulic cylinder to connect with the oil circuit inside the hydraulic cylinder, thereby making the impact cavity 3 connected with the oil circuit of the hydraulic cylinder.

[0031] The top of the housing 1 is provided with a sealed end cap 5. An impact rod 6 is provided in the impact chamber 3 with a sealed sliding connection. A spring 7 is provided in the transition chamber 2. The impact rod 6 extends to the outer wall of the transition chamber 2 and connects to one end of the spring 7. The other end of the spring 7 is connected to the lower end face of the end cap 5. A retention rod 8 is provided in the end cap 5 with a sealed sliding connection. The lower end of the retention rod 8 is located in the transition chamber 2 and contacts the impact rod 6. A memory identification card 9 is provided at the upper end of the retention rod 8. The memory identification card 9 has different colored markings from top to bottom. The memory identification card 9 is located in the observation chamber 10, which is located on top of the end cap 5. When the pressure inside the cylinder is normal, the spring 7 holds the impact rod 6 in place, and the impact rod 6 does not contact the retaining rod 8. When the pressure inside the cylinder is too high, the oil flows into the impact chamber 3 and pushes the impact rod 6 to overcome the elastic force of the spring 7 and move upward. Then the impact rod 6 contacts the retaining rod 8 and pushes the retaining rod 8 upward. At the same time, the memory identification card 9 moves upward in the observation chamber 10. Subsequently, the pressure inside the cylinder returns to normal or the cylinder is damaged. The spring 7 pushes the impact rod 6 to reset, and the impact rod 6 separates from the retaining rod 8. The retaining rod 8 remains in a fixed position due to the friction of the end cap 5. The memory identification card 9 can still maintain the state at the maximum impact pressure value. Therefore, by observing the position change of the memory identification card 9, it can be known that the cylinder has been subjected to an impact exceeding the normal design working pressure.

[0032] In this embodiment, the force-bearing area of ​​one end of the impact rod 6 located inside the impact chamber 3 is calculated based on the stroke of the retaining rod 8. The travel of the impact rod 6 is inversely proportional to the deformation of the spring 7. In this embodiment, the spring 7 is designed based on experimental tests conducted at 2 times the normal working pressure value, 1.5 times the normal working pressure value, and 1.25 times the normal working pressure value of the hydraulic cylinder. This design ensures that the spring 7 remains sealed during normal operation and that the impact rod 6 moves according to the designed stroke when subjected to impact pressure.

[0033] In this embodiment, a truncated cone 6-1 is provided at the waist of the impact rod 6, and the upper surface of the truncated cone 6-1 is connected to one end of the spring 7; a spring seat 11 is provided on the lower surface of the end cap 5, and the lower surface of the spring seat 11 is connected to the other end of the spring 7. A sealing seat 2-1 is provided on the bottom surface of the transition cavity 2, and the sealing seat 2-1 is in contact with the bottom surface of the truncated cone 6-1. During normal operation, under the push of the spring 7, the bottom surface of the truncated cone 6-1 is tightly pressed against the sealing seat 2-1.

[0034] like Figure 2 As shown, in this embodiment, a limiting platform 8-1 is provided at the lower part of the retaining rod 8, and the upper surface of the limiting platform 8-1 is in limiting cooperation with the lower surface of the spring seat 11.

[0035] like Figure 2As shown, the end cover 5 comprises a gland 5-1, the gland 5-1 is sealingly connected with the top of the shell 1, a first sealing band 5-2 is arranged in the gland 5-1, a retention cavity 5-3 is arranged in the middle of the first sealing band 5-2, and the retention rod 8 is sealingly and slidably arranged in the retention cavity 5-3. The retention rod 8 is lifted upward by the impact rod 6, and after the impact rod 6 and the retention rod 8 are out of contact, due to the friction between the first sealing band 5-2 and the retention rod 8, the retention rod 8 can overcome its own gravity and remain in position without falling.

[0036] The top of the gland 5-1 is provided with an observation cavity 10, and the side wall of the observation cavity 10 is provided with an observation hole 10-1 through which the memory identification card 9 can be observed. In this embodiment, from top to bottom, they are green, yellow and red. The red mark position is the position of the cylinder 2 times the normal working pressure stroke, the yellow mark position is the position of 1.5 times the normal working pressure, and the green mark is the position of 1.25 times the normal working pressure. In the initial state of the normal working of the oil cylinder, the color cannot be observed through the observation hole 10-1, when the pressure in the oil cylinder reaches 1.25 times the normal working pressure, the green mark is lifted to the visual range of the observation hole 10-1 through the lifting of the retention rod 8 by the impact rod 6, and it can be known in the same way that when the red mark is observed in the observation hole 10-1, it means that the pressure in the oil cylinder reaches 2 times the normal working pressure. It should be additionally pointed out that color mark positions can be added according to actual needs, and the displacement stroke of the retention rod 8 is designed according to the pressure of the oil cylinder, so that the bottom end liquid contact area of the impact rod 6, the spring 7 and the displacement stroke of the retention rod 8 are matched.

[0037] The gland 5-1 is provided with a buckle cover 5-4, the buckle cover 5-4 is provided with a second sealing band 5-5 around the buckle cover 5-4, and the buckle cover 5-4 is sealingly connected with the gland 5-1 through the second sealing band 5-5. The spring seat 11 is fixedly arranged on the bottom surface of the buckle cover 5-4; and the first sealing band 5-2 is arranged at the center position of the buckle cover 5-4.

[0038] In this embodiment, the top wall of the observation cavity 10 is provided with a reset screw 10-2, the bottom end of the reset screw 10-2 is in contact with the top end of the memory identification card 9. When it is necessary to reset the memory identification card 9 and the retention rod 8, the reset screw 10-2 is screwed, and the reset screw 10-2 moves downward to push the memory identification card 9 and the retention rod 8 to reset.

[0039] The reset screw 10-2 is threadedly connected to the top plate of the end cover 5. Figure 2 The limit position of the memory identification card 9 is shown in the middle, and the reset screw 10-2 needs to reserve the full stroke position of the memory identification card 9 during installation so that the red mark can be observed through the observation hole 10-1.

[0040] The working process of the utility model is as follows:

[0041] First, a connector seat is connected to the cylinder barrel. Connector 4 is inserted into the connector seat, connecting the impact chamber 3 to the oil passage inside the cylinder. When high pressure is generated inside the cylinder, the oil flows through the impact chamber 3 and impacts the impact rod 6. This pushes the impact rod 6 upwards, overcoming the spring force of the spring 7. The impact rod 6 then contacts the retaining rod 8 and pushes it upwards, causing the memory identification card 9 to move upwards within the observation chamber 10. Subsequently, if the pressure inside the cylinder returns to normal or the cylinder fails, the spring 7 pushes the impact rod 6 back to its original position, disengaging it from the retaining rod 8. Due to the friction of the first sealing strip 5-2, the retaining rod 8 overcomes its own weight and remains in position, preventing it from falling. This keeps the memory identification card 9 in the highest pressure impact state. By observing the color markings on the memory identification card 9 through the observation hole 10-1, the operator can determine the pressure value exceeding the normal operating pressure experienced by the cylinder.

[0042] Example 2

[0043] like Figure 4 As shown, in this example, based on Embodiment 1, the memory identification card 9 has been redesigned. The memory identification card 9 has different numerical scale lines representing different pressures from top to bottom. Different pressure levels are represented by numerical scale lines, and other technical features are the same as in Embodiment 1.

[0044] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A ram pressure memory device, characterized by: The utility model provides a kind of shock absorber, including shell (1), the inside of shell (1) is sequentially provided with transition chamber (2) from top to bottom, impact chamber (3) passing through each other, the outer wall of shell (1) corresponding to impact chamber (3) is provided with joint (4), impact chamber (3) is connected with the oil circuit of oil cylinder, the top of shell (1) is provided with sealingly connected end cover (5); Sealing sliding connection is provided in the impact chamber (3) impact rod (6), spring (7) is provided in the transition chamber (2), the outer wall of impact rod (6) extending to the transition chamber (2) is connected with one end of spring (7), the other end of spring (7) is connected on the lower end surface of end cover (5); Sealing sliding connection is provided in the end cover (5) and stays rod (8), the lower end of stays rod (8) is located in the transition chamber (2) and is contacted with impact rod (6), and the upper end of stays rod (8) is provided with memory identification card (9), and memory identification card (9) is located in observation chamber (10), and observation chamber (10) is provided on the top of end cover (5).

2. The ram pressure memory device of claim 1, wherein: The waist of impact rod (6) is provided with a frustum (6-1), and the upper surface of the frustum (6-1) is connected with one end of the spring (7); The lower surface of the end cover (5) is provided with a spring seat (11), and the lower surface of the spring seat (11) is connected with the other end of the spring (7).

3. The ram pressure memory device of claim 2, wherein: The lower part of the stays rod (8) is provided with a limiting table (8-1), and the upper surface of the limiting table (8-1) is limitedly matched with the lower surface of the spring seat (11).

4. The ram pressure memory device of claim 2, wherein: The bottom surface of the transition chamber (2) is provided with a sealing seat (2-1), and the bottom surface of the sealing seat (2-1) is in contact with the bottom surface of the frustum (6-1).

5. The ram pressure memory device of claim 2, wherein: The end cover (5) includes a gland (5-1), and the gland (5-1) is sealingly connected with the top of the shell (1). The gland (5-1) is provided with a first sealing band (5-2) therein, and a stay chamber (5-3) is provided in the middle of the first sealing band (5-2). The stays rod (8) is sealingly and slidingly arranged in the stay chamber (5-3). The top of the gland (5-1) has the observation chamber (10), and the side wall of the observation chamber (10) is provided with an observation hole (10-1) through which the memory identification card (9) can be seen.

6. The ram pressure memory device of claim 5, wherein: The gland (5-1) is provided with a buckle cover (5-4) therein, and the second sealing band (5-5) is provided around the buckle cover (5-4). The buckle cover (5-4) is sealingly connected with the gland (5-1) through the second sealing band (5-5). The spring seat (11) is fixedly arranged on the bottom surface of the buckle cover (5-4). The first sealing band (5-2) is arranged at the center position of the buckle cover (5-4).

7. The ram pressure memory device of claim 1, wherein: The top wall of the observation chamber (10) is provided with a reset screw (10-2), and the bottom end of the reset screw (10-2) is in contact with the top end of the memory identification card (9). The reset screw (10-2) is threadedly connected to the top plate of the end cover (5).

8. The ram pressure memory device of claim 1, wherein: The memory identification card (9) is provided with different color marks representing different pressures from top to bottom.

9. The ram pressure memory device of claim 1, wherein: The memory identification card (9) is provided with different numerical scale lines representing different pressures from top to bottom.

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