Air-source-free buffer device
By using a bowl-shaped elastic seal to separate the buffer cavity in the airless buffer, the buffer force is increased and the reset resistance is reduced, thus solving the problem of slow reset speed of the airless buffer. It is suitable for lithium battery production lines.
Patent Information
- Application Number
- CN202422746631.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-11
- Publication Date
- 2025-09-12
- Estimated Expiration
- 2034-11-11
AI Technical Summary
When the existing air source-free buffer increases the buffering force, the piston rod has large reset resistance and slow reset speed, and is not suitable for lithium battery production lines.
A bowl-shaped elastic seal is used to separate the buffer chamber into a positive pressure chamber and a negative pressure chamber. The buffer force is increased by the close fit between the bowl wall and the buffer chamber wall. During reset, the friction between the bowl wall and the chamber wall is reduced, thereby reducing the reset resistance.
While maintaining high buffering force, it significantly reduces the reset resistance of the piston rod and increases the reset speed of the piston rod, making it suitable for lithium battery production lines.
Smart Images
Figure CN223331021U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of buffer equipment, in particular to a buffer device without an air source. Background Art
[0002] At present, most common buffers are springs or hydraulic buffers. The magnitude of the spring's buffering force is determined by the spring's elastic coefficient, effective length and other characteristics. Moving parts with different kinetic energy require different types of springs. Improper spring selection and the loss of spring elasticity during use will affect the buffering effect of the spring buffer. Hydraulic buffers have the risk of oil leakage and are not suitable for lithium battery production lines. Airless buffers do not use hydraulic oil, so there is no risk of oil leakage and contamination of the battery cells. In addition, airless buffers rely on the gas in the positive pressure chamber to buffer the pressure of the internal rubber parts (rubber piston head) and the friction between the internal rubber parts and the inner wall of the cylinder. The greater the impact force, the greater the buffering force, making them particularly suitable for lithium battery production lines. However, in order to improve the sealing effect between the internal rubber parts and the inner wall of the cylinder, existing airless buffers generally use an interference fit between the internal rubber parts and the inner wall of the cylinder, resulting in high resistance to piston rod reset and slow reset speed.
[0003] Therefore, there is an urgent need for a gas-free buffer device to solve the above problems. Utility Model Content
[0004] The utility model aims to provide a buffer device without air source, which can improve the buffer force and reduce the reset resistance of the piston rod.
[0005] To achieve this purpose, the present invention adopts the following technical solutions:
[0006] A buffer device without air source, comprising:
[0007] The buffer cavity has a first end and a second end that are opposite to each other, and a buffer cavity is provided inside the buffer cavity;
[0008] a piston rod having a first end and a second end opposite to each other, the piston rod being movably assembled on the buffer cavity, the first end of the piston rod extending into the buffer cavity and toward the first end of the buffer cavity, and the second end being exposed at the second end of the buffer cavity;
[0009] a back plate fixedly disposed on the first end of the piston rod;
[0010] an elastic sealing member, comprising a bowl bottom and a bowl wall, wherein the bowl bottom is sleeved on the piston rod and fixedly arranged on a side of the back plate away from the second end of the buffer cavity, and the bowl wall surrounds the outer circumference of the bowl bottom and extends in a direction away from the back plate, and when the elastic sealing member moves with the piston rod toward the first end of the buffer cavity, the outer circumferential surface of the bowl wall can adhere to the cavity wall of the buffer cavity;
[0011] The resetting elastic member is sleeved on the piston rod and abuts against the second end of the buffer cavity, and is used to drive the piston rod to drive the elastic sealing member to move toward the second end of the buffer cavity to reset.
[0012] As an improvement to the above technical solution, the following is also included:
[0013] a stopper, which surrounds and is fixed to the first end of the piston rod and abuts against a side of the back plate facing the second end of the buffer cavity;
[0014] A fixing member is fixedly arranged on the first end of the piston rod, and the bowl bottom and the back plate are clamped between the fixing member and the stop portion.
[0015] As an improvement of the above technical solution, it also includes a pressure plate sleeved on the piston rod, and the pressure plate is clamped between the fixing member and the bowl bottom.
[0016] As an improvement of the above technical solution, it also includes a buffer pad sleeved on the piston rod, and the buffer pad is arranged on a side of the stop portion away from the back plate.
[0017] As an improvement to the above technical solution, an overflow gap is provided between the outer peripheral surface of the back plate and the cavity wall of the buffer cavity.
[0018] As an improvement of the above technical solution, the buffer cavity is cylindrical, the piston rod and the buffer cavity are coaxially arranged, and the outer contour of the cross section of the bowl wall perpendicular to the piston rod is circular.
[0019] As an improvement of the above technical solution, it also includes an elastic adjustment piece, which is threadedly assembled on the second end of the piston rod, and the reset elastic piece is arranged outside the buffer cavity, and the end of the reset elastic piece away from the buffer cavity abuts against the elastic adjustment piece.
[0020] As an improvement of the above technical solution, it further includes a collision head, which is fixedly arranged on a side of the elastic force adjustment member away from the reset elastic member.
[0021] As an improvement of the above technical solution, it also includes a limiter, which is fixedly arranged on the buffer cavity and located between the impact head and the buffer cavity. The limiter is provided with an abutting surface for abutting the impact head at one end close to the impact head.
[0022] As an improvement of the above technical solution, the limiting member includes:
[0023] a bottom plate, sleeved on the piston rod and fixedly arranged on the outer wall of the buffer cavity, wherein one end of the reset elastic member close to the buffer cavity abuts against the bottom plate;
[0024] The support tube is fixedly arranged on a side of the bottom plate facing the impact head, and a side of the support tube facing away from the bottom plate forms the abutting surface.
[0025] Compared with the prior art, the present invention has the following beneficial effects:
[0026] In the air-source-free buffer device of the present invention, the elastic seal separates the buffer cavity into a positive-pressure cavity near the first end of the buffer cavity and a negative-pressure cavity near the second end of the buffer cavity, and the elastic seal is composed of a bowl bottom and a bowl wall, and is bowl-shaped as a whole, with the bowl mouth facing the positive-pressure cavity. When the air-source-free buffer device is buffering, the piston rod drives the elastic seal to move toward the first end of the buffer cavity. At this time, the pressure in the positive-pressure cavity increases sharply, and the pressure in the negative-pressure cavity decreases. The bowl wall of the elastic seal clings to the cavity wall of the buffer cavity under the action of the gas pressure in the positive-pressure cavity, so that there is a non-positive pressure between the elastic seal and the cavity wall of the buffer cavity during the buffering process. The sealing effect is very good, which effectively increases the speed of increasing the pressure difference between the positive pressure chamber and the negative pressure chamber and the speed of increasing the friction between the elastic seal and the wall of the buffer chamber, thereby increasing the buffer force. When the reset elastic member drives the piston rod to reset, the piston rod drives the elastic seal to move toward the second end of the buffer chamber. In this process, the pressure in the positive pressure chamber decreases rapidly, and the pressure in the negative pressure chamber increases rapidly. The bowl-shaped structure of the elastic seal makes its sealing effect and the friction between it and the wall of the buffer chamber decrease rapidly at this time, thereby greatly reducing the resistance when the piston rod is reset, which is conducive to the rapid reset of the piston rod. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] Figure 1 This is a structural diagram of the air-source-free buffer device provided by an embodiment of the present utility model in a reset state;
[0028] Figure 2 yes Figure 1 Enlarged view of point A in the middle;
[0029] Figure 3 This is a structural diagram of the air-source-free buffer device provided by an embodiment of the present utility model during the buffering process;
[0030] Figure 4 It is a structural schematic diagram of the air-source-free buffer device provided by an embodiment of the utility model in a buffering position.
[0031] In the picture:
[0032] 11. Buffer chamber; 12. Piston rod; 13. Back plate;
[0033] 14. Elastic seal; 141. Bowl bottom; 142. Bowl wall;
[0034] 15. Reset elastic member; 16. Stopper; 17. Fixing member; 18. Pressing plate; 19. Buffer pad; 20. Elastic force adjustment member; 21. Impact head;
[0035] 22. Limiting member; 221. Abutting surface; 222. Bottom plate; 223. Support cylinder;
[0036] 100, buffer cavity; 200, overcurrent gap. DETAILED DESCRIPTION
[0037] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0038] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.
[0039] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.
[0040] In the description of this embodiment, terms such as "upper," "lower," and "right" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.
[0041] like Figures 1-4 As shown, this embodiment provides an air-source-free buffer device, including a buffer chamber 11, a piston rod 12, a back plate 13, an elastic seal 14, and a reset elastic member 15. The buffer chamber 11 has a first end and a second end that are arranged opposite to each other, and a buffer chamber 100 is arranged inside the buffer chamber 11. The piston rod 12 has a first end and a second end that are arranged opposite to each other. The piston rod 12 is movably assembled on the buffer chamber 11, and the first end of the piston rod 12 extends into the buffer chamber 100 and extends toward the first end of the buffer chamber 11, and the second end is exposed at the second end of the buffer chamber 11. The back plate 13 is fixedly arranged at the first end of the piston rod 12. The elastic seal 14 includes a bowl bottom 141 and a bowl wall 142. The bowl bottom 141 is sleeved on the piston rod 12 and fixedly mounted on the side of the back plate 13 away from the second end of the buffer chamber 11. The bowl wall 142 surrounds the outer periphery of the bowl bottom 141 and extends away from the back plate 13. When the elastic seal 14 moves toward the first end of the buffer chamber 11 along with the piston rod 12, the outer peripheral surface of the bowl wall 142 can adhere to the wall of the buffer chamber 100. The reset elastic member 15 is sleeved on the piston rod 12 and abuts against the second end of the buffer chamber 11. It is used to drive the piston rod 12 to drive the elastic seal 14 to move toward the second end of the buffer chamber 11 and reset. In this embodiment, the reset elastic member 15 is a spring. In other embodiments, other types of elastic members can also be selected as the reset elastic member 15.
[0042] The air-source-free buffer device provided in this embodiment has an elastic seal 14 that separates the buffer chamber 100 into a positive-pressure chamber near the first end of the buffer chamber 11 and a negative-pressure chamber near the second end of the buffer chamber 11. The elastic seal 14 is composed of a bowl bottom 141 and a bowl wall 142, and is bowl-shaped as a whole, with the bowl mouth facing the positive-pressure chamber. When the air-source-free buffer device is buffering, the piston rod 12 drives the elastic seal 14 to move toward the first end of the buffer chamber 11. At this time, the pressure in the positive-pressure chamber increases sharply, and the pressure in the negative-pressure chamber decreases. The bowl wall 142 of the elastic seal 14 is tightly attached to the wall of the buffer chamber 100 under the action of the gas pressure in the positive-pressure chamber, so that the elastic seal 14 and the buffer chamber 100 are in a state of contact during the buffering process. There is a very good sealing effect between the cavity walls, which effectively increases the speed of increasing the pressure difference between the positive pressure cavity and the negative pressure cavity and the speed of increasing the friction between the elastic seal 14 and the cavity wall of the buffer cavity 100, thereby increasing the buffering force. When the reset elastic member 15 drives the piston rod 12 to reset, the piston rod 12 drives the elastic seal 14 to move toward the second end of the buffer cavity 11. During this process, the pressure in the positive pressure cavity decreases rapidly, and the pressure in the negative pressure cavity increases rapidly. The bowl-shaped structure of the elastic seal 14 makes its sealing effect and the friction between it and the cavity wall of the buffer cavity 100 both decrease rapidly at this time, thereby greatly reducing the resistance when the piston rod 12 is reset, which is conducive to the rapid reset of the piston rod 12.
[0043] Alternatively, as Figures 1-4 As shown, the air-source-free buffer device provided in this embodiment also includes a stopper 16 and a fixing member 17. The stopper 16 is fixed around the first end of the piston rod 12 and abuts against the side of the back plate 13 facing the second end of the buffer chamber 11. The stopper 16 supports the back plate 13 to prevent the back plate 13 from sliding toward the second end of the piston rod 12 during the buffering process of the air-source-free buffer device. In this embodiment, the stopper 16 and the piston rod 12 are integrally formed so that the stopper 16 and the piston rod 12 are firmly connected. The fixing member 17 is fixedly provided at the first end of the piston rod 12, and the bowl bottom 141 and the back plate 13 are clamped between the fixing member 17 and the stopper 16. The fixing member 17 clamps the bowl bottom 141 and the back plate 13 to the stopper 16 to prevent the bowl bottom 141 and the back plate 13 from sliding toward the first end of the piston rod 12 during the resetting process of the piston rod 12. In this embodiment, the fixing member 17 is a nut, and the first end of the piston rod 12 is provided with an external thread. The fixing member 17 is threadedly connected to the piston rod 12. The fixing member 17 and the piston rod 12 are easy to disassemble, which facilitates the replacement of the elastic seal 14.
[0044] Furthermore, if Figures 1-4As shown, the air-source-free buffer device provided in this embodiment also includes a pressure plate 18 that is sleeved on the piston rod 12 and is sandwiched between the fixing member 17 and the bowl bottom 141. The fixing member 17 needs to rotate relative to the piston rod 12 during installation and removal, and the pressure plate 18 can serve to separate the fixing member 17 from the elastic seal 14, preventing damage to the elastic seal 14 when the fixing member 17 rotates relative to the piston rod 12. In addition, the diameter of the pressure plate 18 is larger than that of the fixing member 17, which can effectively disperse the pressure of the fixing member 17 on the elastic seal 14, preventing the elastic seal 14 from being squeezed and damaged by the fixing member 17.
[0045] Alternatively, as Figures 1-4 As shown, the air-source-free buffer device provided in this embodiment also includes a buffer pad 19 mounted on the piston rod 12. The buffer pad 19 is located on the side of the stopper 16 away from the back plate 13. When the piston rod 12 is reset, the buffer pad 19, located between the stopper 16 and the second end wall of the buffer cavity 100, provides a buffering effect, preventing the stopper 16 from rigidly colliding with the buffer cavity 11. In this embodiment, the buffer pad 19 is made of rubber, which provides a good buffering effect.
[0046] Alternatively, as Figures 1-4 As shown, a flow gap 200 is provided between the outer circumference of the back plate 13 and the wall of the buffer chamber 100. When the piston rod 12 is reset, the gas in the negative pressure chamber can enter the positive pressure chamber through the flow gap 200, further reducing the reset resistance of the piston rod 12 and increasing the reset speed of the piston rod 12. The clearance formed between the back plate 13 and the wall of the buffer chamber 100 can also guide the piston rod 12 to a certain extent.
[0047] Alternatively, as Figures 1-4 As shown, the buffer chamber 100 is cylindrical, the piston rod 12 is coaxially arranged with the buffer chamber 100, and the bowl wall 142 has a circular cross-sectional outer contour perpendicular to the piston rod 12. Compared with buffer chambers 100 and bowl walls 142 of other shapes, the cylindrical buffer chamber 100 combined with the bowl wall 142 having a circular cross-sectional outer contour allows the bowl wall 142 to better conform to the wall of the buffer chamber 100 when the pressure in the positive pressure chamber increases. Preferably, the bowl bottom 141 is flat, allowing it to fit tightly against the backplate 13, and the bowl wall 142 is hollow cylindrical, effectively increasing the contact area between the bowl wall 142 and the buffer chamber 100.
[0048] Alternatively, as Figures 1-4As shown, the air-source-free buffer device provided in this embodiment also includes an elastic force adjustment member 20, which is threadedly assembled to the second end of the piston rod 12. The reset elastic member 15 is disposed outside the buffer cavity 11, and the end of the reset elastic member 15 away from the buffer cavity 11 abuts against the elastic force adjustment member 20. The elastic force adjustment member 20 is threadedly assembled to the piston rod 12, so that the initial elastic force of the reset elastic member 15 can be adjusted by rotating the elastic force adjustment member 20, thereby adjusting the reset elastic force of the reset elastic member 15. The elastic force adjustment member 20 and the reset elastic member 15 are both disposed outside the buffer cavity 11, making it easier for the operator to adjust the elastic force adjustment member 20.
[0049] Furthermore, if Figures 1-4 As shown, the airless buffer device provided in this embodiment also includes a collision head 21, which is fixedly arranged on the side of the elastic adjustment member 20 away from the reset elastic member 15. When the airless buffer device buffers the buffered member, the collision head 21 abuts against the buffered member.
[0050] Furthermore, if Figures 1-4 As shown, the air-source-free buffer device provided in this embodiment also includes a limit member 22, which is fixedly arranged on the buffer cavity 11 and is located between the impact head 21 and the buffer cavity 11. The limit member 22 is provided with an abutting surface 221 at one end close to the impact head 21 for abutting the impact head 21. The buffer stroke of the piston rod 12 is limited by the abutment between the limit member 22 and the impact head 21.
[0051] Furthermore, if Figures 1-4 As shown, the limiting member 22 includes a base plate 222 and a support cylinder 223. The base plate 222 is sleeved on the piston rod 12 and fixedly arranged on the outer wall of the buffer cavity 11. The end of the reset elastic member 15 close to the buffer cavity 11 abuts against the base plate 222. The support cylinder 223 is fixedly arranged on the side of the base plate 222 facing the impact head 21, and the side of the support cylinder 223 facing away from the base plate 222 forms an abutting surface 221. Using the support cylinder 223 to abut and support the impact head 21 can make the force on the impact head 21 and the buffer cavity 11 more uniform, and arranging the base plate 222 between the support cylinder 223 and the buffer cavity 11 can prevent the impact on the support cylinder 223 from directly acting on the buffer cavity 11. In this embodiment, the support cylinder 223 is coaxially arranged with the piston rod 12 to further improve the uniformity of the force on the impact head 21 and the buffer cavity 11 when the limiting member 22 abuts against the impact head 21. The resetting elastic member 15 is disposed in the supporting tube 223 , and one end of the resetting elastic member 15 close to the buffer cavity 11 abuts against the bottom plate 222 .
[0052] In summary, the air-source-free buffer device provided in this embodiment has a good sealing effect of the elastic seal 14 during the buffering process, and the friction between it and the wall of the buffer chamber 100 is large, which can increase the buffering force. However, during the resetting process of the piston rod 12, the sealing effect of the elastic seal 14 is poor, and the friction between it and the wall of the buffer chamber 100 is small, which is conducive to the rapid resetting of the piston rod 12.
[0053] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and replacements can be made without departing from the technical principles of the present invention. These improvements and replacements should also be regarded as the scope of protection of the present invention.
Claims
1. A buffer device without air source, characterized in that: include: A buffer cavity (11) has a first end and a second end that are arranged opposite to each other, and a buffer cavity (100) is arranged inside the buffer cavity (11); A piston rod (12) having a first end and a second end arranged opposite to each other, the piston rod (12) being movably assembled on the buffer cavity (11), the first end of the piston rod (12) extending into the buffer cavity (100) and toward the first end of the buffer cavity (11), and the second end being exposed at the second end of the buffer cavity (11); a back plate (13) fixedly disposed on the first end of the piston rod (12); An elastic sealing member (14) comprises a bowl bottom (141) and a bowl wall (142), wherein the bowl bottom (141) is sleeved on the piston rod (12) and fixedly arranged on a side of the back plate (13) away from the second end of the buffer cavity (11), and the bowl wall (142) surrounds the outer periphery of the bowl bottom (141) and extends in a direction away from the back plate (13); when the elastic sealing member (14) moves toward the first end of the buffer cavity (11) along with the piston rod (12), the outer peripheral surface of the bowl wall (142) can adhere to the cavity wall of the buffer cavity (100); A reset elastic member (15) is sleeved on the piston rod (12) and abuts against the second end of the buffer cavity (11), and is used to drive the piston rod (12) to drive the elastic sealing member (14) to move toward the second end of the buffer cavity (11) for reset.
2. The airless buffer device according to claim 1, characterized in that: Also includes: A stopper (16) is fixed around the first end of the piston rod (12) and abuts against a side of the back plate (13) facing the second end of the buffer cavity (11); A fixing member (17) is fixedly arranged on the first end of the piston rod (12), and the bowl bottom (141) and the back plate (13) are clamped between the fixing member (17) and the stop portion (16).
3. The airless buffer device according to claim 2, characterized in that: It also includes a pressure plate (18) sleeved on the piston rod (12), and the pressure plate (18) is clamped between the fixing member (17) and the bowl bottom (141).
4. The airless buffer device according to claim 2, characterized in that: It also includes a buffer pad (19) sleeved on the piston rod (12), and the buffer pad (19) is arranged on a side of the stop portion (16) away from the back plate (13).
5. The airless buffer device according to claim 1, characterized in that: An overflow gap (200) is provided between the outer peripheral surface of the back plate (13) and the cavity wall of the buffer cavity (100).
6. The airless buffer device according to claim 1, characterized in that: The buffer cavity (100) is cylindrical, the piston rod (12) and the buffer cavity (100) are coaxially arranged, and the outer contour of the cross section of the bowl wall (142) perpendicular to the piston rod (12) is circular.
7. The air-source-free buffer device according to any one of claims 1 to 6, characterized in that: The invention also includes an elastic force adjusting member (20), wherein the elastic force adjusting member (20) is threadedly assembled on the second end of the piston rod (12), and the reset elastic member (15) is arranged outside the buffer cavity (11), and the end of the reset elastic member (15) away from the buffer cavity (11) abuts against the elastic force adjusting member (20).
8. The airless buffer device according to claim 7, characterized in that: It also includes a bump head (21), which is fixedly arranged on a side of the elastic force adjustment member (20) facing away from the reset elastic member (15).
9. The airless buffer device according to claim 8, characterized in that: The invention also includes a limiting member (22), which is fixedly arranged on the buffer cavity (11) and located between the impact head (21) and the buffer cavity (11), and an abutting surface (221) for abutting the impact head (21) is provided at one end of the limiting member (22) close to the impact head (21).
10. The airless buffer device according to claim 9, characterized in that: The limiting member (22) comprises: A bottom plate (222) is sleeved on the piston rod (12) and fixedly arranged on the outer wall of the buffer cavity (11); one end of the reset elastic member (15) close to the buffer cavity (11) abuts against the bottom plate (222); The support tube (223) is fixedly arranged on a side of the bottom plate (222) facing the impact head (21), and a side of the support tube (223) facing away from the bottom plate (222) forms the abutting surface (221).