Automatic exhaust oil cylinder

Abstract

An automatic exhaust oil cylinder comprises an oil inlet and outlet, a cylinder body and a plunger rod, the oil inlet and outlet is formed in the side wall of the cylinder body, a through hole is formed in the upper end of the cylinder body, the plunger rod penetrates through the through hole and is in sliding connection with the cylinder body, the plunger rod comprises a plunger rod body, a spring and a plug, and an exhaust channel communicated with the cylinder body is arranged in the plunger rod body. The exhaust channel comprises an air outlet channel, a containing channel and a bottom channel which are sequentially communicated from top to bottom. The plug is arranged in the containing channel and can move between a plugging position and a conduction position, the plugging position is located above the conduction position, and the upper end and the lower end of the spring abut against the top face of the containing channel and the plug respectively. According to the utility model, the plug and the spring are arranged in the plunger rod, so that the plug can be matched with the plunger rod to finish the lifting of the plunger rod while the oil cylinder can be sealed after exhausting, the safety of the oil cylinder is improved, and the structure of the oil cylinder is more compact.

Description

Technical Field

[0001] The utility model relates to an automatic exhaust device, in particular to an automatic exhaust oil cylinder. Background Art

[0002] The presence of air in the cylinder easily causes the hydraulic oil to mix with air, which in turn creates bubbles. These bubbles are shattered by high pressure, generating intense vibration and noise. This significantly reduces the responsiveness of component movements, leading to errors in component operation, affecting control accuracy and the smooth operation of the hydraulic system. Furthermore, the presence of air in the oil reduces the volumetric efficiency of the cylinder, affecting the efficiency of energy transfer.

[0003] Chinese utility model patent publication number CN209959604U proposes a self-venting hydraulic cylinder. This design creates a groove in the piston and a channel in the piston rod that communicates with the outside world. The piston rod drives the piston downward, expelling air through the channel. However, this approach easily allows air to enter the cylinder and fails to guarantee a tight seal within the cylinder. Therefore, a self-venting cylinder is needed that can achieve automatic venting and protect the cylinder from airborne influences during operation. Utility Model Content

[0004] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present invention is to design an automatic exhaust cylinder. By arranging a spring and a plug in the exhaust channel of the plunger rod, the plug can be accurately opened and closed under the action of air pressure, and can block the exhaust hole after the air is exhausted to prevent air from entering the cylinder, and provide upward power to the plunger rod through the plug.

[0005] To achieve the above-mentioned purpose, the utility model provides an automatic exhaust oil cylinder, including an oil inlet and outlet, a cylinder body and a plunger rod, the oil inlet and outlet are arranged on the side wall of the cylinder body and are connected with the interior of the cylinder body, a through hole is opened at the upper end of the cylinder body, the plunger rod passes through the through hole and is slidably connected with the cylinder body, and is characterized in that: the plunger rod includes a plunger rod body, a spring and a plug, and an exhaust channel connected with the cylinder body is provided in the plunger rod body, the exhaust channel includes an air outlet channel, a accommodating channel and a bottom channel connected in sequence from top to bottom; the plug is arranged inside the accommodating channel and can move between a blocking position and a conducting position, the blocking position is located above the conducting position, and the upper and lower ends of the spring are respectively in contact with the top surface of the accommodating channel and the plug.

[0006] Furthermore, the air outlet channel is an L-shaped channel, comprising a transverse channel extending to the side wall of the plunger rod and a longitudinal channel communicating with the accommodating channel.

[0007] Furthermore, the accommodating channel is provided with an annular limiting inclined surface which gradually expands outward from top to bottom, and the upper end of the plug is provided with an annular blocking inclined surface corresponding to the annular limiting inclined surface.

[0008] Furthermore, a first limiting ring is provided at the lower opening of the accommodating channel, and the inner diameter of the first limiting ring is smaller than the outer diameter of the plug.

[0009] Furthermore, an oil seal is provided on the inner wall of the cylinder.

[0010] Furthermore, there are multiple oil seals, which are arranged at intervals up and down.

[0011] Furthermore, the inner wall of the cylinder body is provided with a wear-resistant ring to assist the sliding of the plunger rod.

[0012] Furthermore, a second limiting ring is provided at the lower end of the plunger rod to prevent the plunger rod from sliding out of the cylinder body, and the outer diameter of the second limiting ring is larger than the inner diameter of the through hole.

[0013] By adopting the above technical solution, the beneficial effects of the present invention are as follows: the plug of the automatic exhaust cylinder of the present invention can be precisely opened and closed under the action of air pressure, without manual intervention, ensuring the reliability and stability of the cylinder operation. When the air is exhausted, the plug can promptly block the exhaust hole to prevent hydraulic oil leakage. After the plug blocks the air hole, it can also provide upward thrust to the plunger rod, coordinating the raising and lowering of the plunger rod, and achieving a higher degree of automation. In addition, the automatic exhaust cylinder of the present invention has a more compact structure, is easy to manufacture and install, and reduces production costs and maintenance difficulties. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic structural diagram of an automatic exhaust cylinder according to an embodiment of the present utility model;

[0015] Figure 2 This is a schematic diagram of the first stage of the automatic exhaust cylinder according to an embodiment of the present utility model;

[0016] Figure 3 This is a schematic diagram of the second stage of the automatic exhaust cylinder involved in an embodiment of the present utility model.

[0017] The accompanying drawings are marked as follows: 1. Oil inlet and outlet; 2. Cylinder body; 21. Oil seal; 3. Plunger rod; 31. Exhaust channel; 301. Bottom channel; 302. Accommodating channel; 303. Exhaust channel; 304. First limiting ring; 32. Plug; 33. Spring; 4. Hydraulic oil. DETAILED DESCRIPTION

[0018] The technical solution of the present invention is further described below by way of embodiments:

[0019] The utility model provides an automatic exhaust oil cylinder, such as Figures 1 to 3 As shown, it includes oil inlet and outlet ports 1, a cylinder body 2, and a plunger rod 3. The oil inlet and outlet ports 1 are located on the side wall of the cylinder body 2 and communicate with the interior of the cylinder body 2, allowing the input and output of hydraulic oil 4. A through hole is opened at the upper end of the cylinder body 2, through which the plunger rod 3 passes and is slidably connected to the cylinder body 2.

[0020] Specifically, the plunger rod 3 includes a plunger rod 3 body, a spring 33 and a plug 32. An exhaust channel 31 connected to the cylinder body 2 is provided in the plunger rod 3 body. The exhaust channel 31 includes an outlet channel 303, a accommodating channel 302 and a bottom channel 301 connected in sequence from top to bottom. The plug 32 is arranged inside the accommodating channel 302 and can move between a blocking position and a conducting position. When the plug 32 is in the blocking position, the accommodating channel 302 is blocked. When the plug 32 is in the conducting position, the accommodating channel 302 is conducted. The blocking position is above the conducting position. The upper end and the lower end of the spring 33 are respectively in contact with the top surface of the accommodating channel 302 and the plug 32. The first stage: when the oil inlet and outlet 1 just starts to supply oil, the plug 32 is in the conducting position, the accommodating channel 302 is conducted, and as the hydraulic oil 4 enters, the air inside the cylinder 2 is discharged in sequence through the bottom channel 301, the accommodating channel 302 and the air outlet channel 303; the second stage: when the hydraulic oil 4 submerges a part of the plug 32, the plug 32 moves upward under the action of buoyancy against the force of the spring 33, and moves from the conducting position to the blocking position, so that the accommodating channel 302 is blocked, thereby completing the exhaust process.

[0021] In addition, after the exhaust is completed, the input hydraulic oil 4 continues to push the plug 32, causing the entire plunger rod 3 to move upward, providing power for external equipment.

[0022] Specifically, the air outlet channel 303 is an L-shaped channel, including a transverse channel extending to the side wall of the plunger rod 3 and a longitudinal channel communicating with the accommodating channel.

[0023] In this embodiment, the accommodating channel 302 is provided with an annular limiting slope that gradually expands outward from top to bottom, and the upper end of the plug 32 is provided with an annular sealing slope corresponding to the annular limiting slope. When the plug 32 is in the blocking position, the annular limiting slope is in contact with the annular sealing slope.

[0024] In other embodiments, the accommodating channel 302 may also be provided with a downward step surface. Accordingly, the upper surface of the plug 32 is a plane, and when the plug 32 is in the blocking position, the step surface contacts the upper surface of the plug 32 .

[0025] In this embodiment, a first limiting ring 304 is provided at the lower opening of the accommodating channel 302, and the inner diameter of the first limiting ring 304 is smaller than the outer diameter of the plug 32. The first limiting ring 304 can prevent the plug 32 from falling out of the accommodating channel 302.

[0026] In other embodiments, the upper end and the lower end of the spring 33 may be fixedly connected to the top surface of the accommodating channel 302 and the plug 32 respectively. This structure can also prevent the plug 32 from falling out of the accommodating channel 302.

[0027] In this embodiment, the oil inlet and outlet ports 1 are opened on the bottom end of the side wall of the cylinder body 2. In other embodiments, the oil inlet and outlet ports 1 can also be opened at other positions on the cylinder body 2, as long as it can ensure that the hydraulic oil 4 can squeeze the air out of the cylinder.

[0028] Specifically, an oil seal 21 is provided on the inner surface of the through hole to form a sealed cavity between the cylinder body 2 and the plunger rod 3 to prevent the hydraulic oil 4 from being squeezed out when the air is discharged.

[0029] It is worth mentioning that a plurality of oil seals 21 can be provided on the inner wall of the cylinder body 2 to improve the sealing effect.

[0030] Specifically, a wear-resistant ring (not shown in the figure) is provided on the inner surface of the through hole, which can assist the plunger rod 3 in sliding up and down and reduce friction resistance.

[0031] As a preferred embodiment, a second limiting ring (not shown) is provided at the lower end of the plunger rod 3 to prevent the plunger rod 3 from sliding out of the cylinder body 2, and the outer diameter of the second limiting ring is larger than the inner diameter of the through hole.

Claims

1. An automatic exhaust cylinder, comprising an oil inlet and outlet, a cylinder body, and a plunger rod, wherein the oil inlet and outlet are arranged on the side wall of the cylinder body and communicate with the interior of the cylinder body, a through hole is formed at the upper end of the cylinder body, and the plunger rod passes through the through hole and is slidably connected to the cylinder body, characterized in that: The plunger rod includes a plunger rod body, a spring and a plug. An exhaust channel connected to the cylinder body is provided in the plunger rod body. The exhaust channel includes an air outlet channel, a receiving channel and a bottom channel connected in sequence from top to bottom; the plug is arranged inside the receiving channel and can move between a blocking position and a conducting position. The blocking position is located above the conducting position. The upper end and the lower end of the spring are respectively in contact with the top surface of the receiving channel and the plug.

2. The automatic exhaust cylinder according to claim 1, characterized in that: The air outlet channel is an L-shaped channel, comprising a transverse channel extending to the side wall of the plunger rod and a longitudinal channel communicating with the accommodating channel.

3. The automatic exhaust cylinder according to claim 1, characterized in that: The accommodating channel is provided with an annular limiting inclined surface which gradually expands outward from top to bottom, and the upper end of the plug is provided with an annular blocking inclined surface corresponding to the annular limiting inclined surface.

4. The automatic exhaust cylinder according to claim 1, characterized in that: A first limiting ring is provided at the lower opening of the accommodating channel, and the inner diameter of the first limiting ring is smaller than the outer diameter of the plug.

5. The automatic exhaust cylinder according to claim 1, characterized in that: An oil seal is provided on the inner wall of the cylinder body.

6. The automatic exhaust cylinder according to claim 5, characterized in that: There are multiple oil seals, which are arranged at intervals up and down.

7. The automatic exhaust cylinder according to claim 1, characterized in that: The inner wall of the cylinder body is provided with a wear-resistant ring for assisting the sliding of the plunger rod.

8. The automatic exhaust cylinder according to claim 1, characterized in that: A second limiting ring is provided at the lower end of the plunger rod to prevent the plunger rod from sliding out of the cylinder body, and the outer diameter of the second limiting ring is larger than the inner diameter of the through hole.

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