Multi-channel oil cylinder structure

Abstract

The utility model provides a multi-channel oil cylinder structure, and belongs to the technical field of oil cylinders. The multi-channel oil cylinder structure comprises an oil cylinder and a bypass pipe, the oil cylinder comprises a piston and a cylinder body, the piston divides the cylinder body into a main cavity and an auxiliary cavity from bottom to top, the horizontal section of the auxiliary cavity is smaller than that of the main cavity, the two ends of the bypass pipe are communicated with the main cavity and the auxiliary cavity respectively, and the bypass pipe is communicated with the main cavity. And a one-way damping valve and a valve A are arranged on the bypass pipe. In the application, the one-way damping valve is utilized to provide damping to slow down falling when the piston rapidly falls, the stroke of the piston is not occupied, and compared with a spring damper in the prior art, the size is smaller and lighter.

Description

Technical Field

[0001] The present application relates to the technical field of oil cylinders, and in particular to a multi-channel oil cylinder structure. Background Art

[0002] The oil cylinder is a mechanism that pushes the piston to move by injecting high-pressure oil. In order to reduce the damage caused by the piston moving to the extreme position and colliding with the cylinder body, Chinese patent application number CN202121811718.0 discloses an oil cylinder with an auxiliary oil supply channel arranged in the cylinder. This scheme mainly arranges a spring damping at one end of the cylinder body to cushion the piston, thereby preventing the piston rod from colliding with the oil cylinder housing and being damaged.

[0003] However, in the process of implementing the technical solution in the embodiments of the present application, the inventor of the present application found that the above technology has at least the following technical problems:

[0004] The spring damper is located in the cylinder, taking up the piston's travel and also adding extra weight. Utility Model Content

[0005] In order to make up for the above deficiencies, the present application provides a multi-channel cylinder structure, aiming to improve the problems mentioned in the above background technology.

[0006] An embodiment of the present application provides a multi-channel oil cylinder structure, including an oil cylinder and a side pipe, wherein the oil cylinder includes a piston and a cylinder body, wherein the piston divides the cylinder body into a main chamber and a secondary chamber from bottom to top, wherein the horizontal cross-section of the secondary chamber is smaller than the horizontal cross-section of the main chamber, wherein both ends of the side pipe are respectively connected to the main chamber and the secondary chamber, and a one-way damping valve and a valve A are provided on the side pipe.

[0007] In a specific embodiment, the one-way damping valve is a Tesla valve.

[0008] In the above implementation process, the Tesla valve has the functions of forward conduction and reverse damping. In the present embodiment, the damping effect is reduced by reducing the diversion angle, so that the oil cylinder is less affected by the damping when it moves normally. Of course, the reverse damping effect of the Tesla valve can also be adjusted by adjusting the pipe diameter and the number of valve pairs. Specifically, when the piston is pushed upward, the pressure in the auxiliary chamber increases, and the hydraulic oil enters the main chamber through the bypass pipe. At this time, the Tesla valve is forward-conducted. When the piston moves downward normally, the pressure in the auxiliary chamber decreases, and the hydraulic oil slowly reverses through the Tesla valve, and the damping is limited. The normal downward movement of the piston is less affected. When the oil supply equipment fails, such as when the oil supply pipe bursts, the piston will lose support and fall rapidly. At this time, the fluid flow rate in the Tesla valve is accelerated, and the damping is increased. In addition, the flow limiting effect of the bypass pipe itself slows down the falling speed of the piston and reduces the collision loss between the oil cylinder and the cylinder body.

[0009] In a specific implementation manner, both ends of the side pipe are provided with compression sleeves, the compression sleeves are threadedly connected to the cylinder body, and the compression sleeves tighten the side pipe to the side wall of the cylinder body.

[0010] In the above implementation process, the pressing sleeve is sleeved on the side pipe, and the pressing sleeve is screwed into the cylinder body, so that the side pipe is pressed tightly against the cylinder body, which is convenient for installation.

[0011] In a specific embodiment, sealing rings are provided at the lower end of the piston and the mouth of the cylinder.

[0012] In the above implementation process, the sealing ring is used to improve the sealing between the piston and the cylinder body.

[0013] In a specific implementation, the secondary chamber is connected to an oil extraction nozzle, and a valve B is provided on the oil extraction nozzle.

[0014] In the above implementation process, before the piston is pushed out to the supporting position, if the piston needs to be in place quickly, valve A is closed and valve B is opened. The external oil pump draws out the hydraulic oil in the auxiliary chamber through the oil suction nozzle. Since the volume of the auxiliary chamber is small, the piston can be pushed out quickly until it reaches the supporting position, which is the position where force is required. At this time, valve A is opened and valve B is closed. The pressure in the main chamber increases and force is started to be exerted to push out.

[0015] In a specific implementation, the main chamber is connected to an oil supply nozzle, and a three-way reversing valve is arranged on the oil supply nozzle, and the other two ports of the reversing valve are respectively connected to an external boosting pump and an oil tank.

[0016] In the above implementation process, when the piston is pushed out quickly, the reversing valve connects the oil tank with the main chamber. At this time, when the piston rises, a large amount of hydraulic oil in the oil tank will be sucked into the main chamber. The suction speed is much greater than the pumping speed of the booster pump. Therefore, the resistance when the piston is sucked and pushed upward can be reduced. When the piston needs to be pushed out with force, the reversing valve connects the booster pump with the main chamber, and the piston ejection speed slows down, but the force increases.

[0017] In a specific embodiment, a step is provided at the lower portion of the cylinder body.

[0018] In the above implementation process, the step is used to limit the downward movement of the piston, so that most of the bottom end area of ​​the piston is exposed in the main chamber, thereby converting the liquid pressure into pressure, and the lower ends of the oil supply nozzle and the bypass pipe are arranged below the step, which can avoid the oil supply nozzle and the bypass pipe being blocked when the piston falls to the bottom.

[0019] In a specific embodiment, a buffer pad is provided on the step.

[0020] In the above implementation process, the buffer pad can prevent the piston from directly hitting the step, reducing noise and collision damage.

[0021] Compared with the prior art, the beneficial effects of the present application are: by utilizing a one-way damping valve, damping can be provided to slow down the fall of the piston when the piston falls rapidly, and the piston stroke is not occupied, and the volume of the spring damping is smaller and lighter than that of the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the implementation methods of the present application, the drawings required for use in the implementation methods will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a first-view schematic diagram of a multi-channel oil cylinder structure provided in an embodiment of the present application;

[0024] Figure 2 A schematic diagram of a multi-channel oil cylinder structure from a second perspective provided in an embodiment of the present application;

[0025] Figure 3 A schematic diagram of the cross-sectional structure of the oil cylinder provided in an embodiment of the present application.

[0026] In the figure: 10-oil cylinder; 11-piston; 12-cylinder body; 13-main chamber; 14-auxiliary chamber; 15-oil suction nozzle; 16-valve B; 17-oil supply nozzle; 18-reversing valve; 19-step; 20-bypass pipe; 30-one-way damping valve; 40-valve A; 50-pressing sleeve; 60-sealing ring. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0028] See also Figure 1-Figure 3 The present application provides a multi-channel oil cylinder structure, including an oil cylinder 10 and a side pipe 20. The oil cylinder 10 includes a piston 11 and a cylinder body 12. The piston 11 divides the cylinder body 12 from bottom to top into a main chamber 13 and a secondary chamber 14. The horizontal cross section of the secondary chamber 14 is smaller than the horizontal cross section of the main chamber 13. Both ends of the side pipe 20 are connected to the main chamber 13 and the secondary chamber 14 respectively. A one-way damping valve 30 and a valve A40 are arranged on the side pipe 20. The one-way damping valve 30 can provide damping to slow down the piston 11 when it falls rapidly, and does not occupy the stroke of the piston 11. Compared with the spring damping in the prior art, the volume is smaller and lighter.

[0029] See also Figure 1-Figure 3The one-way damping valve 30 is a Tesla valve. The Tesla valve has the functions of forward conduction and reverse damping. In this embodiment, the damping effect is reduced by reducing the diversion angle, so that the oil cylinder 10 is less affected by the damping when it moves normally. Of course, the reverse damping effect of the Tesla valve can also be adjusted by adjusting the pipe diameter and the number of valve pairs. Specifically, when the piston 11 is pushed upward, the pressure in the auxiliary chamber 14 increases, and the hydraulic oil enters the main chamber 13 through the bypass pipe 20. At this time, the Tesla valve is forward-conducted. When the piston 11 moves down normally, the pressure in the auxiliary chamber 14 decreases, and the hydraulic oil slowly reverses through the Tesla valve, and the damping is limited. The normal downward movement of the piston 11 is less affected. When the oil supply equipment fails, such as when the oil supply pipe bursts, the piston 11 will lose support and fall rapidly. At this time, the fluid flow rate in the Tesla valve is accelerated, and the damping is increased. In addition, the flow limiting effect of the bypass pipe 20 itself slows down the falling speed of the piston 11, reducing the collision loss between the oil cylinder 10 and the cylinder body 12.

[0030] See also Figure 1-Figure 3 Both ends of the side pipe 20 are provided with a pressing sleeve 50, which is screwed to the cylinder body 12, and the pressing sleeve 50 presses the side pipe 20 tightly against the side wall of the cylinder body 12. The pressing sleeve 50 is sleeved on the side pipe 20, and the pressing sleeve 50 is screwed into the cylinder body 12, so that the side pipe 20 is pressed against the cylinder body 12, which is convenient for installation.

[0031] See also Figure 1-Figure 3 The lower end of the piston 11 and the mouth of the cylinder 12 are both provided with a sealing ring 60. The sealing ring 60 is used to improve the sealing performance between the piston 11 and the cylinder 12.

[0032] See also Figure 1-Figure 3 The auxiliary chamber 14 is connected to an oil pumping nozzle 15, and a valve B16 is provided on the oil pumping nozzle 15. Before the piston 11 is pushed out to the supporting position, if the piston 11 needs to be in place quickly, the valve A40 is closed, the valve B16 is opened, and the external oil pump pumps out the hydraulic oil in the auxiliary chamber 14 through the oil pumping nozzle 15. Since the volume of the auxiliary chamber 14 is small, the piston 11 can be pushed out quickly until it reaches the supporting position, that is, the position where force is required. At this time, the valve A40 is opened, the valve B16 is closed, and the pressure in the main chamber 13 increases to start the force push out.

[0033] See also Figure 1-Figure 3The main chamber 13 is connected to an oil supply nozzle 17, and a three-way reversing valve 18 is provided on the oil supply nozzle 17. The other two ports of the reversing valve 18 are connected to the external booster pump and the oil tank respectively. When the piston 11 is ejected quickly, the reversing valve 18 connects the oil tank with the main chamber 13. At this time, when the piston 11 rises, a large amount of hydraulic oil in the oil tank will be sucked into the main chamber 13. This suction speed is much faster than the pumping speed of the booster pump, so it can reduce the resistance when the piston 11 is sucked and pushed upward. When the piston 11 needs to be pushed out with force, the reversing valve 18 connects the booster pump with the main chamber 13, and the ejection speed of the piston 11 slows down, but the force increases.

[0034] See also Figure 1-Figure 3 , a step 19 is provided at the lower part of the cylinder body 12. The step 19 is used to limit the downward movement of the piston 11, so that most of the bottom end area of ​​the piston 11 is exposed in the main chamber 13, thereby converting the liquid pressure into pressure, and the lower ends of the oil supply nozzle 17 and the side pipe 20 are both arranged below the step 19, which can avoid the situation where the oil supply nozzle 17 and the side pipe 20 are blocked when the piston 11 falls to the bottom.

[0035] See also Figure 1-Figure 3 , a buffer pad is provided on the step 19. The buffer pad can prevent the piston 11 from directly hitting the step 19, reducing noise and collision damage.

[0036] The working principle of the multi-channel oil cylinder structure is: when the piston 11 rises normally, the valve A40 opens, the valve B16 closes, the reversing valve 18 connects the boost pump with the main chamber 13, and pumps oil into the main chamber 13. Due to the connecting effect of the bypass pipe 20, the main chamber 13 and the auxiliary chamber 14 increase synchronously. Since the horizontal cross-section of the auxiliary chamber 14 is smaller than the horizontal cross-section of the main chamber 13, the pressure of the main chamber 13 on the piston 11 is much greater than the pressure of the auxiliary chamber 14. The piston 11 is still pushed upward, and at the same time, the hydraulic oil in the auxiliary chamber 14 enters the main chamber 13 through the bypass pipe 20 and the Tesla valve. When the piston 11 needs to rise quickly, the valve A40 is closed, the valve B16 is opened, the reversing valve 18 connects the main chamber 13 with the oil tank, and the oil pump draws the oil in the auxiliary chamber 14 away. Since the horizontal cross-section of the auxiliary chamber 14 is small, it can be lifted upward. It rises very quickly. At the same time, the volume of the main chamber 13 increases rapidly, and a large amount of hydraulic oil is sucked from the oil tank, which is conducive to the rapid movement of the piston 11 into place. When the piston 11 begins to be pressurized and topped, the valve A40 opens, the valve B16 closes, and the boost pump supplies oil to the main chamber 13 normally. When the oil supply equipment fails, such as when the oil supply pipe bursts, the piston 11 will lose support and fall rapidly. At this time, the fluid flow rate in the Tesla valve is accelerated, the damping is increased, and the flow limiting effect of the side pipe 20 itself is added, thereby slowing down the falling speed of the piston 11 and reducing the collision loss between the cylinder 10 and the cylinder body 12. In summary, the one-way damping valve 30 can provide damping to slow down the falling of the piston 11 when it falls rapidly, and does not occupy the stroke of the piston 11. Compared with the spring damping in the prior art, it is smaller and lighter.

[0037] The above are only embodiments of the present application and are not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, improvement or equivalent replacement made within the spirit and principle of the present application shall be included in the scope of protection of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

Claims

1. A multi-channel cylinder structure, characterized in that: The invention comprises an oil cylinder (10) and a bypass pipe (20), wherein the oil cylinder (10) comprises a piston (11) and a cylinder body (12), wherein the piston (11) divides the cylinder body (12) from bottom to top into a main chamber (13) and a secondary chamber (14), wherein the horizontal cross section of the secondary chamber (14) is smaller than the horizontal cross section of the main chamber (13), wherein two ends of the bypass pipe (20) are respectively connected to the main chamber (13) and the secondary chamber (14), and a one-way damping valve (30) and a valve A (40) are arranged on the bypass pipe (20).

2. A multi-channel cylinder structure according to claim 1, characterized in that: The one-way damping valve (30) is a Tesla valve.

3. A multi-channel cylinder structure according to claim 2, characterized in that: Both ends of the side pipe (20) are provided with a pressing sleeve (50), the pressing sleeve (50) is threadedly connected to the cylinder body (12), and the pressing sleeve (50) tightly presses the side pipe (20) against the side wall of the cylinder body (12).

4. A multi-channel oil cylinder structure according to claim 3, characterized in that: The lower end of the piston (11) and the mouth of the cylinder (12) are both provided with sealing rings (60).

5. A multi-channel oil cylinder structure according to claim 4, characterized in that: The auxiliary chamber (14) is connected to an oil extraction nozzle (15), and a valve B (16) is provided on the oil extraction nozzle (15).

6. A multi-channel oil cylinder structure according to claim 5, characterized in that: The main chamber (13) is connected to an oil supply nozzle (17), and a three-way reversing valve (18) is arranged on the oil supply nozzle (17). The other two ports of the reversing valve (18) are respectively connected to an external boosting pump and an oil tank.

7. A multi-channel oil cylinder structure according to claim 6, characterized in that: The lower part of the cylinder body (12) is provided with a step (19).

8. A multi-channel oil cylinder structure according to claim 7, characterized in that: A buffer pad is arranged on the step (19).

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