Stroke-adjustable air cylinder
By introducing buffer channels and buffer valves into the cylinder, the problem of unstable operation of traditional cylinders in the welding station is solved, the adjustability and buffering effect of cylinder stroke are achieved, and the quality of welding workpieces and the service life of the cylinder are improved.
Patent Information
- Application Number
- CN202421810724.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-29
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-07-29
AI Technical Summary
Traditional adjustable stroke cylinders cannot effectively absorb the impact force of the piston on the end cap in the welding station, resulting in unstable operation of the cylinder and cannot meet the strength and performance requirements of the welded workpiece.
An adjustable stroke cylinder is designed. By setting a buffer channel and a buffer valve on the cylinder body, the movement of the piston is controlled and controlled by high-pressure gas to realize automatic adjustment and buffering effect of the cylinder stroke. The opening of the buffer valve changes with the change of high-pressure gas, achieving smooth operation of the cylinder output part.
The adjustability and buffering effect of the cylinder stroke is achieved, ensuring that the cylinder output part runs smoothly to the stroke end point during return, and improving the quality of the welded workpiece and the service life of the cylinder.
Smart Images
Figure CN223164775U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of cylinder design and manufacturing, in particular to an adjustable-stroke cylinder. Background Technique
[0002] At the welding station of a welding machine, the movement of a welding tong is controlled by a cylinder. Since the thickness of the workpiece to be welded is different, generally, a cylinder with an adjustable retraction stroke is selected for this station. This cylinder has a large output force and high speed. To ensure the strength and performance of the workpiece to be welded, the cylinder needs to run smoothly without significant impact and rebound. However, the traditional adjustable-stroke cylinder generally uses a rubber pad buffering method, which is insufficient to absorb the impact force of the piston on the end cover. Content of the Utility Model
[0003] For this reason, the utility model provides an adjustable-stroke cylinder that can automatically adjust air buffering.
[0004] In view of the above technical problems, the utility model provides the following technical solutions:
[0005] An adjustable-stroke cylinder includes: a cylinder body including a cylinder barrel and a first cover body and a second cover body respectively disposed on both sides of the cylinder barrel; a cylinder output part including an output piston rod extending from the first cover body to the outside of the cylinder body and a main piston sleeved on the output piston rod; a stroke adjustment part including an adjustment piston rod extending from the second cover body to the outside of the cylinder body and an adjustment piston sleeved on the adjustment piston rod, a buffer channel is provided inside the adjustment piston, and a buffer valve for controlling its on-off is provided on the buffer channel; wherein, a first air hole and a second air hole are provided on the cylinder body, a third air hole is provided on the adjustment piston rod, the high-pressure gas entering the cylinder body along the first air hole is adapted to push the main piston towards the second cover body direction, the high-pressure gas entering the cylinder body along the second air hole is adapted to push the adjustment piston towards the first cover body direction; the high-pressure gas entering the cylinder body along the third air hole is adapted to push the main piston towards the first cover body direction.
[0006] In some embodiments of the utility model, a buffer ring is provided at one end of the output piston rod close to the adjustment piston rod, a buffer cavity adapted to cooperate with the buffer ring is provided on one side of the adjustment piston close to the main piston, and a sealing structure is provided between the buffer cavity and the buffer ring.
[0007] In some embodiments of the utility model, the buffer channel includes a first channel and a second channel intersecting with each other, and the buffer valve controls the connection or disconnection of the first channel and the second channel.
[0008] In some embodiments of the present utility model, the adjusting piston is provided with a valve cavity communicating with the first channel and the second channel respectively. The buffer valve includes: a mounting plug fixedly connected in the valve cavity, a sealing pin slidably connected in the valve cavity, and an elastic member located between the mounting plug and the sealing pin; wherein, in the initial state, the sealing pin extends to the intersection position of the first channel and the second channel.
[0009] In some embodiments of the present utility model, it further includes an adjusting handle and an adjusting nut. The adjusting handle is sleeved on the adjusting piston rod and can be axially adjusted relative to the adjusting piston rod. The adjusting nut is threadedly connected to the adjusting piston rod to limit the axial position of the adjusting handle.
[0010] In some embodiments of the present utility model, the first cover body respectively includes a first annular cover plate and a first end cover plug. There is a gap between the first annular cover plate and the output piston rod. The first end cover plug is sealingly sleeved on the output piston rod.
[0011] In some embodiments of the present utility model, the first air hole is arranged on the first annular cover plate. Gas enters the first chamber inside the cylinder body along the first air hole and the gap between the first annular cover plate and the output piston rod, and acts on the main piston.
[0012] In some embodiments of the present utility model, the second cover body respectively includes a second annular cover plate and a second end cover plug. There is a gap between the second annular cover plate and the adjusting piston rod. The second end cover plug is sealingly sleeved on the adjusting piston rod.
[0013] In some embodiments of the present utility model, the second air hole is arranged on the second annular cover plate. Gas enters the second chamber inside the cylinder body along the second air hole and the gap between the second annular cover plate and the adjusting piston rod, and acts on the adjusting piston.
[0014] In some embodiments of the present utility model, the third air hole extends axially along the adjusting piston rod to the inside of the cylinder body. Gas enters the third chamber along the third air hole and acts on the main piston.
[0015] The technical solution of the present utility model has the following technical effects compared with the prior art:
[0016] In the adjustable-stroke cylinder provided by the present utility model, by controlling the adjusting piston to move towards the first cover body to different positions, the maximum stroke of the cylinder output part can be changed, realizing the adjustment of the cylinder stroke. At the same time, by arranging a buffer channel on the adjusting piston and a buffer valve on the buffer channel, when the cylinder output part returns, it can drive the buffer valve to open the buffer channel, enabling the gas to be discharged through the buffer channel. Since the opening degree of the buffer valve can change with the change of the high-pressure gas, the high-pressure gas can be discharged in time, so that the cylinder output part can run smoothly to the end of the stroke, and the buffer effect is better. Brief Description of the Drawings
[0017] The following will describe in detail the preferred embodiments of the present utility model through the drawings, which will help to understand the purpose and advantages of the present utility model, wherein:
[0018] Figure 1 is a partial cross-sectional view of a specific embodiment of the adjustable-stroke cylinder of the present utility model;
[0019] Figure 2 is a partial enlarged view of a specific embodiment of the adjustable-stroke cylinder of the present utility model;
[0020] Figure 3 is a stroke adjustment diagram of a specific embodiment of the adjustable-stroke cylinder of the present utility model;
[0021] Figure 4 is a schematic diagram of the air flow when the adjustable-stroke cylinder of the present utility model intakes air along the third air hole;
[0022] Figure 5 is a schematic diagram of the initial state when the adjustable-stroke cylinder of the present utility model intakes air along the first air hole;
[0023] Figure 6 is a schematic diagram of the adjustable-stroke cylinder of the present utility model when intaking air along the first air hole and after the output piston rod is matched with the adjusting piston. Detailed Description of the Embodiment
[0024] The following will clearly and completely describe the technical solutions of the present utility model in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments of the present utility model belong to the scope of protection of the present utility model.
[0025] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.
[0026] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.
[0027] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.
[0028] As Figure 1 、 Figure 2 As shown in
[0029] a specific embodiment of the adjustable stroke cylinder provided by the present utility model, it includes a cylinder body, a cylinder output part acting on a driving part, and a stroke adjusting part for adjusting the stroke of the cylinder.
[0030] In the above adjustable stroke cylinder, by controlling the movement of the adjusting piston 32 towards the first cover body 11 to different positions, the maximum stroke of the cylinder output part can be changed, realizing the adjustment of the cylinder stroke. At the same time, by providing a buffer channel 321 on the adjusting piston 32 and a buffer valve 33 on the buffer channel 321, when the cylinder output part moves back (i.e., towards the second cover body 12), the buffer valve 33 can be driven to open the buffer channel 321, enabling the gas to be discharged through the buffer channel 321. Since the opening degree of the buffer valve 33 can change with the change of the high-pressure gas, the high-pressure gas can be discharged in time, so that the cylinder output part can smoothly run to the end of the stroke, and the buffer effect is better.
[0031] Specifically, in an optional embodiment, as Figure 2 shown, a buffer ring 23 is provided at one end of the output piston rod 21 close to the adjusting piston rod 31, and a buffer cavity 322 adapted to cooperate with the buffer ring 23 is provided on one side of the adjusting piston 32 close to the main piston 22. The buffer cavity 322 is formed as a circular groove adapted to the outer diameter of the buffer ring 23, and a buffer sealing ring 34 is provided between the cavity wall of the buffer cavity 322 and the buffer ring 23. When the main piston 22 and the output piston rod 21 are at the maximum output position (i.e., the output piston rod 21 extends the farthest outside the cylinder body), the output piston rod 21 is separated from the adjusting piston rod 31. When the high-pressure gas enters the cylinder along the first air hole 10a and causes the main piston 22 to drive the output piston rod 21 to move towards the second cover body 12, the gas is quickly discharged along the third air hole 31c on the adjusting piston rod 31. When the output piston rod 21 continues to move until the buffer ring 23 thereon is in sealing cooperation with the buffer cavity 322 of the adjusting piston 32, the channel communicating with the third air hole 31c is blocked, so that the gas between the main piston 22 and the adjusting piston 32 flows along the buffer channel 321 on the adjusting piston 32 and pushes the buffer valve 33 to open, enabling the high-pressure gas to be discharged from the buffer channel 321 to the third air hole 31c.
[0032] Specifically, in an optional embodiment, as Figure 2 shown, the buffer channel 321 of the adjusting piston 32 includes a first channel 321a and a second channel 321b intersecting with each other, and the buffer valve 33 controls the communication or disconnection between the first channel 321a and the second channel 321b. More specifically, the first channel 321a and the second channel 321b intersect perpendicularly, and the first channel 321a extends along a direction parallel to the center line of the cylinder.
[0033] More specifically, the adjusting piston 32 is provided with a valve cavity 323 communicating with the first channel 321a and the second channel 321b respectively. The buffer valve 33 includes: a mounting plug 331 fixedly connected in the valve cavity 323, a sealing pin 332 slidably connected in the valve cavity 323, and an elastic member 333 located between the mounting plug 331 and the sealing pin 332. Among them, in the initial state, the sealing pin 332 extends to the confluence position of the first channel 321a and the second channel 321b to block the buffer channel 321. When the pressure gas enters the first channel 321a, the sealing pin 332 is pushed to move towards the mounting plug 331 side, so that the first channel 321a is communicated with the second channel 321b, that is, the buffer channel 321 is opened.
[0034] For the convenience of stroke adjustment of the cylinder, as Figure 1 shown, the cylinder further includes an adjusting handle 40 and an adjusting nut 50. The adjusting handle 40 is sleeved on the adjusting piston rod 31 and can be axially adjusted relative to the adjusting piston rod 31. The adjusting nut 50 is threadedly connected to the adjusting piston rod 31 to limit the axial position of the adjusting handle 40. Among them, the adjusting piston rod 31 is provided with a scale mark between the adjusting handle 40 and the cylinder body for the operator to adjust the distance. The adjusting handle 40 can be axially slidably connected to the adjusting piston rod 31. When adjusted to the set position, the position of the adjusting handle 40 on the adjusting piston rod 31 is fixed by the adjusting nut 50.
[0035] Specifically, in an optional implementation manner, as Figure 1 shown, the first cover body 11 includes a first annular cover plate 111 and a first end cover plug 112 inserted into the annular hole of the first annular cover plate 111. The second cover body 12 includes a second annular cover plate 121 and a second end cover plug 122 inserted into the annular hole of the second annular cover plate 121. Among them, the first end of the cylinder body is inserted on the first annular cover plate 111, and the second end of the cylinder body is inserted on the second annular cover plate 121. The three are connected by a fastening assembly 60 passing through between the first annular cover plate 111 and the second annular cover plate 121.
[0036] There is a gap between the first annular cover plate 111 and the output piston rod 21, and the first end cover plug 112 is hermetically sleeved on the output piston rod 21. There is a gap between the second annular cover plate 121 and the adjusting piston rod 31, and the second end cover plug 122 is hermetically sleeved on the adjusting piston rod 31.
[0037] Among them, the first annular cover plate 111 is provided with the first air hole 10a extending radially along the cylinder. High-pressure gas from the outside can enter the first chamber A inside the cylinder body along the first air hole 10a and the gap between the first annular cover plate 111 and the output piston rod 21 and act on the main piston 22. The second annular cover plate 121 is provided with the second air hole 10b extending radially along the cylinder. High-pressure gas from the outside can enter the second chamber B inside the cylinder body along the second air hole 10b and the gap between the second annular cover plate 121 and the adjusting piston rod 31 and act on the adjusting piston 32.
[0038] Specifically, the adjusting piston rod 31 is provided with the third air hole 31c extending axially. High-pressure gas from the outside enters the third chamber C inside the cylinder body along the third air hole 31c and acts on the main piston 22.
[0039] The adjustable stroke cylinder adjusts its stroke in the following way: First, operate the adjusting handle 40 to move the adjusting piston 32 of the stroke adjusting part to a position close to the second cover body 12. At this time, change the axial position of the adjusting handle 40 on the adjusting piston rod 31 according to requirements. The axial position can be accurately adjusted according to the scale marks on the adjusting piston rod 31. For example, adjust the adjusting handle 40 so that the moving distance of the adjusting piston 32 towards the first cover body 11 is TS. When the adjusting handle 40 moves to the set position, such as Figure 3 shown, fix its position by controlling the adjusting nut 50. At this time, the second air hole 10b is ventilated, and the adjusting piston 32 moves towards the first cover body 11, thereby changing the stroke of the main piston 22 moving towards the second cover body 12, realizing the adjustable retraction stroke of the cylinder.
[0040] Figures 4 - 6 The operation process of the adjustable stroke cylinder is shown:
[0041] As Figure 4 shown, when the third air hole 31c is connected to high-pressure gas, the high-pressure gas enters the third chamber C of the cylinder along the third air hole 31c and pushes the main piston 22 to move rapidly towards the first cover body 11, causing the output piston rod 21 to extend outward; as Figure 5 、 Figure 6 shown, when the first air hole 10a is connected to high-pressure gas, the high-pressure gas enters the first chamber A of the cylinder along the first air hole 10a and pushes the main piston 22 to move towards the second cover body 12, causing the output piston rod 21 to retract inward. As Figure 5 shown, when the buffer slip ring on the output piston rod 21 is separated from the adjusting piston 32, the gas in the third chamber C enters the third air hole 31c along the gap between the two, and the main piston 22 and the output piston rod 21 move rapidly; asFigure 6 As shown, after the buffer sliding ring on the output piston rod 21 extends into the buffer chamber 322 of the adjusting piston 32, the channel communicating with the third air hole 31c between the two is blocked, and the gas in the third chamber C enters the first channel 321a on the adjusting piston 32 and pushes the buffer valve 33 to act, so that the first channel 321a is communicated with the second channel 321b, that is, the buffer channel 321 is opened, and the main piston 22 and the output piston rod 21 slowly and stably move to their maximum adjustment positions.
[0042] Obviously, the above embodiments are only examples for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present utility model.
Claims
1. An adjustable stroke cylinder, characterized in that, Comprising: A cylinder block body, including a cylinder barrel and a first cover body and a second cover body respectively arranged on both sides of the cylinder barrel; A cylinder output part, including an output piston rod extending from the first cover body to the outside of the cylinder block body and a main piston sleeved on the output piston rod; A stroke adjustment part, including an adjustment piston rod extending from the second cover body to the outside of the cylinder block body and an adjustment piston sleeved on the adjustment piston rod. A buffer channel is arranged inside the adjustment piston, and a buffer valve for controlling its on-off is arranged on the buffer channel; Wherein, a first air hole and a second air hole are arranged on the cylinder block body, and a third air hole is arranged on the adjustment piston rod. The high-pressure gas entering the cylinder block body along the first air hole is suitable for pushing the main piston to move towards the second cover body direction, and the high-pressure gas entering the cylinder block body along the second air hole is suitable for pushing the adjustment piston to move towards the first cover body direction; The high-pressure gas entering the cylinder block body along the third air hole is suitable for pushing the main piston to move towards the first cover body direction.
2. The adjustable stroke cylinder according to claim 1, characterized in that, A buffer ring is arranged at one end of the output piston rod close to the adjustment piston rod, a buffer cavity suitable for cooperating with the buffer ring is arranged on one side of the adjustment piston close to the main piston, and a sealing structure is arranged between the buffer cavity and the buffer ring.
3. The adjustable stroke cylinder according to claim 1, wherein The buffer channel includes a first channel and a second channel arranged intersectingly, and the buffer valve controls the connection or disconnection between the first channel and the second channel.
4. An adjustable stroke cylinder according to claim 3, characterized in that, The adjustment piston is provided with a valve cavity respectively communicated with the first channel and the second channel. The buffer valve includes: a mounting plug fixedly connected in the valve cavity, a sealing pin slidably connected in the valve cavity, and an elastic member located between the mounting plug and the sealing pin; wherein, in the initial state, the sealing pin extends to the intersection position of the first channel and the second channel.
5. An adjustable stroke cylinder according to claim 1, characterized in that, It further includes an adjustment handle and an adjustment nut. The adjustment handle is sleeved on the adjustment piston rod and can be axially adjusted relative to the adjustment piston rod. The adjustment nut is threadedly connected to the adjustment piston rod to limit the axial position of the adjustment handle.
6. The adjustable stroke cylinder according to claim 1, wherein The first cover body respectively includes a first annular cover plate and a first end cover plug. There is a gap between the first annular cover plate and the output piston rod, and the first end cover plug is hermetically sleeved on the output piston rod.
7. An adjustable stroke cylinder according to claim 6, characterized in that, The first air hole is arranged on the first annular cover plate. The gas enters the first chamber inside the cylinder body along the first air hole and the gap between the first annular cover plate and the output piston rod and acts on the main piston.
8. An adjustable stroke cylinder according to claim 1, characterized in that, The second cover body respectively includes a second annular cover plate and a second end cover plug. There is a gap between the second annular cover plate and the adjustment piston rod, and the second end cover plug is hermetically sleeved on the adjustment piston rod.
9. An adjustable stroke cylinder according to claim 8, characterized in that, The second air hole is arranged on the second annular cover plate. The gas enters the second chamber inside the cylinder body along the second air hole and the gap between the second annular cover plate and the adjustment piston rod and acts on the adjustment piston.
10. An adjustable stroke cylinder according to claim 1, characterized in that, The third air hole extends axially along the adjusting piston rod into the interior of the cylinder block, and gas enters the third chamber along the third air hole and acts on the main piston.