Explosion-proof valve with protection function

Abstract

An anti-explosion valve with a protection function comprises a shell, a first oil way and a second oil way are formed in the shell, the first oil way penetrates through the shell, a first oil hole and a second oil hole are formed in the shell, and the first oil way and the second oil way are communicated through the first oil hole and the second oil hole. A first channel is communicated with one end, located on the first oil way, of the shell, and a second channel is communicated with the other end, located on the first oil way, of the shell. An anti-backflow assembly used for cutting off liquid is arranged in the first oil way, and an anti-explosion assembly used for releasing liquid pressure is arranged in the second oil way. By arranging the anti-explosion assembly, oil in the hydraulic cylinder can be released, the pressure of the hydraulic cylinder is reduced, explosion and deformation of the hydraulic cylinder are prevented, and the service life of the hydraulic cylinder is prolonged.

Description

Technical Field

[0001] The invention belongs to the field of hydraulic explosion-proof valves, and in particular relates to an explosion-proof valve with a protective function. Background Art

[0002] During the use of the hydraulic system of the dump truck, when the hydraulic oil pipe bursts instantly due to overpressure, the hydraulic cylinder loses control and the carriage and materials suddenly fall down when overloaded, the hydraulic explosion-proof valve closes to prevent the hydraulic cylinder from falling, thus protecting the surrounding personnel and the dump truck. At present, conventional hydraulic explosion-proof valves have the problem of rapid drop of overloaded materials in the carriage. After the explosion-proof valve is closed, the hydraulic cylinder is a closed chamber. Due to the overload pressure, it will increase instantly to several times the safety pressure set by the hydraulic cylinder, causing the hydraulic cylinder to explode, expand, and other degrees of damage, and in severe cases, the hydraulic cylinder will be scrapped. Summary of the invention

[0003] The purpose of the present invention is to provide an explosion-proof valve with a protective function to solve the technical problems raised in the above background technology.

[0004] To achieve the above purpose, the specific technical solution of an explosion-proof valve with a protective function of the present invention is as follows:

[0005] An explosion-proof valve with a protective function includes a housing, a first oil circuit and a second oil circuit are opened in the housing, and the first oil circuit passes through the housing, and a first oil hole and a second oil hole are opened in the housing, and the first oil circuit and the second oil circuit are connected through the first oil hole and the second oil hole. A first channel is connected to one end of the first oil circuit on the housing, and a second channel is connected to the other end of the first oil circuit on the housing. A backflow prevention component for interrupting the flow of liquid is provided in the first oil circuit, and an explosion-proof component for releasing the pressure of liquid is provided in the second oil circuit. The explosion-proof component includes a fixed ring provided in the first oil circuit through a connecting plate and a first retaining ring provided in the first oil circuit, a limit valve stem is slidably provided on the fixed ring, a first piston is provided at one end of the limit valve stem, the first piston cooperates with the first retaining ring, and a first spring is sleeved between the fixed ring and the first piston on the limit valve stem. The backflow prevention assembly includes a valve body threadedly connected to the second oil circuit, a second baffle ring arranged in the second oil circuit on one side of the first oil hole, a second spring arranged at the inner end of the valve body, and a second piston arranged at one end of the second spring, and the second piston cooperates with the second baffle ring.

[0006] Furthermore, an inner hexagonal hole is formed at one end of the limit valve stem relative to the first piston, and the first piston and the limit valve stem are threadedly connected. A limit groove is formed on the side wall of the first retaining ring, and a positioning part is provided on the first piston, and the positioning part includes a fixed block distributed on the circumference of the first piston, and a pin that can be inserted into the limit groove is slidably provided on the fixed block, and a third spring is sleeved on the pin.

[0007] Furthermore, the inner end of the valve body is symmetrically provided with guide plates about its axis, and the second piston is slidably arranged between the two guide plates.

[0008] Furthermore, a limit ring is provided in the second oil circuit, and a sealing rubber pad is provided between the valve body and the limit ring.

[0009] Furthermore, an adjusting bolt is threadedly connected to the valve body, and the adjusting bolt passes through the valve body, and the second spring is arranged at the inner end of the adjusting bolt.

[0010] Furthermore, a positioning rod is coaxially provided on one end of the second piston relative to the second retaining ring, and the positioning rod is located in the second spring.

[0011] The explosion-proof valve with a protective function of the present invention has the following advantages:

[0012] 1. The present invention can release the oil in the hydraulic cylinder by setting an explosion-proof component, reduce the pressure of the hydraulic cylinder, prevent it from exploding and deforming, and increase the service life of the hydraulic cylinder.

[0013] 2. The present invention provides a positioning portion, which can facilitate the quick connection and adjustment of the first piston and the limit valve stem, saving time and effort and improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of an explosion-proof valve with a protective function according to the present invention;

[0015] Figure 2 It is a schematic diagram of the structure of the backflow prevention assembly of the present invention;

[0016] Figure 3 This is a schematic diagram of an explosion-proof component of the present invention;

[0017] Figure 4 It is a schematic diagram of the positioning part of the present invention.

[0018] Description of the markings in the figure:

[0019] 1. Housing; 2. First oil circuit; 3. First channel; 4. Second channel; 5. Anti-backflow assembly; 51. Connecting plate; 52. Fixing ring; 53. Limiting valve stem; 54. First piston; 55. First retaining ring; 56. First spring; 6. Inner six holes; 7. Limiting groove; 8. First oil hole; 9. Second oil hole; 10. Second oil circuit; 11. Second retaining ring; 12. Valve body; 13. Adjusting bolt; 14. Second piston; 15. Positioning rod; 16. Second spring; 17. Guide plate; 18. Limiting ring; 19. Sealing pad; 20. Positioning part; 201. Fixing block; 202. Pin; 203. Third spring. DETAILED DESCRIPTION

[0020] In order to better understand the purpose, structure and function of the present invention, the following is a further detailed description of an explosion-proof valve with a protective function of the present invention in conjunction with the accompanying drawings.

[0021] like Figures 1 to 4 As shown, an explosion-proof valve with a protective function of the present invention comprises a housing 1, a first oil circuit 2 and a second oil circuit 10 are opened in the housing 1, and the first oil circuit 2 runs through the housing 1, and the first oil circuit 2 and the second oil circuit 10 are arranged in parallel. A first oil hole 8 and a second oil hole 9 are also opened inside the housing 1, and the first oil circuit 2 and the second oil circuit 10 are connected through the first oil hole 8 and the second oil hole 9. At the same time, a first channel 3 is connected at one end of the first oil circuit 2 on the housing 1, and a second channel 4 is connected at the other end of the first oil circuit 2 on the housing 1. In addition, a backflow prevention component 5 for interrupting the flow of liquid is provided in the first oil circuit 2, and an explosion-proof component for releasing the pressure of liquid is provided in the second oil circuit 10. When in use, the second channel 4 on the housing 1 is connected to the hydraulic cylinder, and the first channel 3 is connected to the oil pipe, and the oil in the oil pipe enters the first oil hole 8 through the first channel 3 and enters the hydraulic cylinder through the second channel 4 after passing through the backflow prevention component 5.

[0022] The explosion-proof assembly includes a fixed ring 52 and a first retaining ring 55 provided in the first oil circuit 2 through a connecting plate 51. A limit valve stem 53 is provided on the fixed ring 52 to slide coaxially therewith, and a first piston 54 is provided at one end of the limit valve stem 53, the first piston 54 cooperates with the first retaining ring 55, and a first spring 56 is sleeved between the fixed ring 52 and the first piston 54 on the limit valve stem 53. The first spring 56 pushes the first piston 54 to achieve its sealing effect on the inner hole of the first retaining ring 55. After the oil in the oil pipe enters the first oil circuit 2, it will enter the second channel 4 through the gap between the first piston 54 and the first retaining ring 55 and flow into the hydraulic cylinder. When the oil pipe bursts instantly due to overpressure, the oil will flow back in the first oil circuit 2, and the backflowing oil will push the first piston 54 and the limit valve stem 53 to move toward the fixing ring 52 until the first piston 54 and the first retaining ring 55 are in contact and sealed, thereby stopping the hydraulic cylinder and preventing the hydraulic rod from continuing to drop rapidly and causing damage to the vehicle and personnel. Specifically, Figure 2 and Figure 3 As shown, the first piston 54 and the first retaining ring 55 are located between the first oil hole 8 and the second oil hole 9 .

[0023] In order to facilitate the installation of the second piston 14 and the limit valve stem 53, the first piston 54 is threadedly connected to the limit valve stem 53. At the same time, the limit valve stem 53 has a hexagonal hole 6 at one end opposite to the first piston 54. By using a tool adapted to the hexagonal hole 6 to rotate the limit valve stem 53 and fix the first piston 54, the position of the first piston 54 on the limit valve stem 53 can be adjusted, thereby adjusting the thrust of the first spring 56 on the first piston 54, and also adjusting the distance between the first piston 54 and the first retaining ring 55, that is, improving the sensitivity of the anti-backflow component 5 to oil flow blocking when the hydraulic cylinder loses control.

[0024] like Figure 4 As shown, a limiting groove 7 is provided on the side wall of the first retaining ring 55, and a positioning portion 20 is provided on the first piston 54, and the positioning portion 20 cooperates with the limiting groove 7. The limiting groove 7 is a circular groove and is coaxially arranged with the first retaining ring 55. The positioning portion 20 for cooperating with the limiting groove 7 includes a fixed block 201 distributed on the circumference of the first piston 54, and a column pin 202 that can be inserted into the limiting groove 7 is slidably provided on the fixed block 201 along the axial direction of the first piston 54, and a third spring 203 is sleeved on the column pin 202. It should be noted that both ends of the column pin 202 are provided with a limiting piece, and the third spring 203 is located between the limiting piece and the fixed block 201, and the limiting piece of the column pin 202 close to one end of the third spring 203 can be inserted into the limiting groove 7, so that the first piston 54 can complete the positioning work with the first retaining ring 55 through each column pin 202. At the same time, the quick connection of the limiting valve stem 53 and the first piston 54 can also be achieved, saving time and effort and improving work efficiency. Among them, after the first piston 54 is connected to the limit valve stem 53, the third spring 203 is compressed, and there is friction between the pin 202 and the limit groove 7. When the limit valve stem 53 is rotated, the process of fixing the first piston 54 can be omitted, so that it is easier to adjust the distance between the first piston 54 and the first retaining ring 55.

[0025] As a preferred example, Figure 2 and Figure 3As shown, the anti-backflow assembly 5 includes a valve body 12 threadedly connected to the second oil circuit 10, a second baffle ring 11 arranged in the second oil circuit 10 on one side of the first oil hole 8, a second spring 16 is provided at the inner end of the valve body 12, and a second piston 14 is provided at one end of the second spring 16. The second piston 14 cooperates with the second baffle ring 11 to enable the second piston 14 to seal the center hole of the second baffle ring 11. When the oil pushes the first piston 54 so that the first piston 54 completes the sealing of the first retaining ring 55, the oil will enter the second oil circuit 10 through the first oil hole 8, and after the oil pressure is greater than the elastic force of the second spring 16, the oil pushes the second piston 14 so that the second piston 14 releases the seal of the second retaining ring, and then the oil will enter the second oil circuit 10 through the gap between the second piston 14 and the second retaining ring, and then flow through the second oil hole 9 to the side space of the first oil circuit 2 close to the first channel 3, and flow out through the first channel 3, so that the oil in the hydraulic cylinder can be released, the pressure of the hydraulic cylinder can be reduced, and it can be prevented from exploding and deforming, thereby increasing the service life of the hydraulic cylinder. When the oil pressure is less than the thrust of the second spring 16, the second spring 16 pushes the second piston 14 to move to the initial position, and again fits with the second retaining ring to seal, blocking the outflow of oil.

[0026] In order to make the second piston 14 move more stably and smoothly, a guide plate 17 is symmetrically provided at the inner end of the valve body 12 about its axis, and the second piston 14 is slidably arranged between the two guide plates 17, wherein the two guide plates 17 are arc-shaped, and the curvature of the two guide plates 17 is adapted to the circumference of the second piston 14.

[0027] like Figure 3 As shown, a limit ring 18 is also provided in the second oil circuit 10, and a sealing rubber pad 19 is provided between the valve body 12 and the limit ring 18. The sealing rubber pad 19 can improve the sealing performance between the valve body 12 and the second oil circuit 10 to prevent leakage of oil. As a further improvement, an adjusting bolt 13 is also threadedly connected to the valve body 12, and the adjusting bolt 13 passes through the valve body 12 and is coaxially arranged therewith, and the second spring 16 is arranged at the inner side end of the adjusting bolt 13. Rotating the adjusting bolt 13 can change the distance between the adjusting bolt 13 and the second piston 14, and the second spring 16 will also change with the rotation of the adjusting bolt 13, so as to achieve the purpose of adjusting the thrust of the second spring 16 on the second piston 14. Specifically, a positioning rod 15 is coaxially provided at one end of the second piston 14 relative to the second retaining ring 11, and the positioning rod 15 is located in the second spring 16. The positioning rod 15 can facilitate the positioning between the second spring 16 and the second piston 14, and prevent the second spring 16 and the second piston 14 from being offset, so that the second piston 14 is subjected to uneven force and cannot work normally.

[0028] Usage: connect the second channel 4 on the housing 1 to the hydraulic cylinder, and connect the first channel 3 to the oil pipe. Then the oil in the oil pipe enters the first oil circuit 2 through the second channel 4, and enters the hydraulic cylinder through the anti-backflow component 5 to push the hydraulic rod out. When the hydraulic cylinder loses control and causes the oil pipe to burst instantly, the oil will form a backflow in the first oil circuit 2. The backflow oil will push the first piston 54 and the limit valve stem 53 to move toward the fixed ring 52 until the first piston 54 and the first retaining ring 55 are in contact and sealed to prevent the oil from continuing to flow back. The oil will enter the second oil circuit 10 through the first oil hole 8, and after the oil pressure is greater than the elastic force of the second spring 16, the oil pushes the second piston 14, so that the second piston 14 releases the seal on the second retaining ring, and then the oil will enter the second oil circuit 10 through the gap between the second piston 14 and the second retaining ring, and then flow through the second oil hole 9 to the side space of the first oil circuit 2 close to the first channel 3, and flow out through the first channel 3, thereby releasing the oil in the hydraulic cylinder.

[0029] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. An explosion-proof valve with a protective function, characterized in that: The invention comprises a housing (1), a first oil passage (2) and a second oil passage (10) are formed in the housing (1), the first oil passage (2) passes through the housing (1), a first oil hole (8) and a second oil hole (9) are formed in the housing (1), and the first oil passage (2) and the second oil passage (10) are connected via the first oil hole (8) and the second oil hole (9); A first passage (3) is connected to one end of the first oil passage (2) on the housing (1), and a second passage (4) is connected to the other end of the first oil passage (2) on the housing (1); An anti-backflow component (5) for cutting off the flow of liquid is provided in the first oil circuit (2), and an explosion-proof component for releasing the pressure of liquid is provided in the second oil circuit (10); The explosion-proof component comprises a fixed ring (52) arranged in the first oil circuit (2) through a connecting plate (51) and a first retaining ring (55) arranged in the first oil circuit (2); a limit valve stem (53) is slidably arranged on the fixed ring (52); a first piston (54) is arranged at one end of the limit valve stem (53); the first piston (54) cooperates with the first retaining ring (55); and a first spring (56) is sleeved on the limit valve stem (53) between the fixed ring (52) and the first piston (54); The backflow prevention assembly (5) comprises a valve body (12) threadedly connected to the second oil circuit (10), a second retaining ring (11) arranged in the second oil circuit (10) and located on one side of the first oil hole (8), a second spring (16) being arranged at the inner end of the valve body (12), and a second piston (14) being arranged at one end of the second spring (16), and the second piston (14) being matched with the second retaining ring (11).

2. The explosion-proof valve with protection function according to claim 1, characterized in that: The limit valve stem (53) has an inner hexagonal hole (6) at one end opposite to the first piston (54), and the first piston (54) and the limit valve stem (53) are threadedly connected; A limiting groove (7) is provided on the side wall of the first retaining ring (55), and a positioning portion (20) is provided on the first piston (54), and the positioning portion (20) includes a fixing block (201) distributed on the circumference of the first piston (54), and a column pin (202) which can be inserted into the limiting groove (7) is slidably provided on the fixing block (201), and a third spring (203) is sleeved on the column pin (202).

3. The explosion-proof valve with protection function according to claim 2, characterized in that: The inner end of the valve body (12) is provided with a guide plate (17) symmetrically about its axis, and the second piston (14) is slidably arranged between the two guide plates (17).

4. An explosion-proof valve with a protective function according to any one of claims 1 to 3, characterized in that: A limiting ring (18) is provided in the second oil circuit (10), and a sealing rubber pad (19) is provided between the valve body (12) and the limiting ring (18).

5. The explosion-proof valve with protection function according to claim 2, characterized in that ； The valve body (12) is threadedly connected with an adjusting bolt (13), and the adjusting bolt (13) passes through the valve body (12). The second spring (16) is arranged at the inner end of the adjusting bolt (13).

6. The explosion-proof valve with protection function according to claim 4, characterized in that ； A positioning rod (15) is coaxially provided at one end of the second piston (14) opposite to the second retaining ring (11), and the positioning rod (15) is located inside the second spring (16).

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