Synchronous telescopic multi-stage hydraulic cylinder with buffering function
By designing a synchronous telescopic mechanism in a multi-stage hydraulic cylinder, and using the coordination of the pushing body and the buffer port, the pressure fluctuation and vibration problems of conventional multi-stage hydraulic cylinders during stage change are solved, and the smooth and synchronous movement of piston rods at all levels is achieved, improving comfort.
Patent Information
- Application Number
- CN202422423809.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-09
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-10-09
AI Technical Summary
Conventional multi-stage hydraulic cylinders will produce pressure fluctuations and vibrations when the piston rod is changed, resulting in poor comfort.
A synchronous telescopic multi-stage hydraulic cylinder is designed. By setting the first and second stage telescopic bars in the cylinder body, and using the coordination of the pushing body and the buffer ports, synchronous and stable movement of the telescopic bars at each stage is achieved, avoiding pressure fluctuations and vibrations during stage change.
The synchronous and stable expansion and contraction of piston rods at all levels in the multi-stage hydraulic cylinder is achieved, eliminating pressure fluctuations and vibrations during stage change, and improving the comfort of use.
Smart Images
Figure CN223049136U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of hydraulic cylinders, in particular to a synchronous telescopic multi-stage hydraulic cylinder with a buffering function. Background Art
[0002] A hydraulic cylinder is an actuator of a hydraulic system, which converts hydraulic energy into mechanical energy and is a hydraulic actuator that makes linear reciprocating motion. The hydraulic cylinder has a simple structure and reliable operation. When used to achieve reciprocating motion, a deceleration device can be omitted, and there is no transmission gap, and the motion is stable. Therefore, it is widely used in the hydraulic systems of various machines.
[0003] A hydraulic cylinder usually consists of a cylinder barrel and a piston rod. Hydraulic oil flows into the cylinder barrel. Because the hydraulic oil in the cylinder barrel is full and the hydraulic pressure increases, the piston rod is pushed up. And the cylinder barrel of a multi-stage hydraulic cylinder has multiple-stage piston rods. During the process of hydraulic oil flowing into the cylinder barrel, the piston rods of each stage of the multi-stage piston rods extend and retract step by step. Since the piston rods of each stage in a conventional multi-stage hydraulic cylinder extend and retract step by step, when the piston rods of each stage change levels, pressure fluctuations are generated due to the change in area between the piston rods of each stage, there is a sense of vibration, and the comfort is poor. Summary of the Utility Model
[0004] The technical problem solved by the utility model is that there are pressure fluctuations, a sense of vibration and poor comfort in the multi-stage hydraulic cylinder when the piston rods of each stage change levels. The utility model provides a synchronous telescopic multi-stage hydraulic cylinder with a buffering function. In the utility model, each stage of telescopic cylinder synchronously extends and retracts, and each stage of telescopic cylinder extends and retracts smoothly, without the occurrence of the change of levels of each stage of telescopic cylinder and without the occurrence of pressure fluctuations and a sense of vibration in the hydraulic cylinder.
[0005] In order to achieve the above purpose, the utility model is realized by the following technical solutions:
[0006] A synchronous telescopic multi-stage hydraulic cylinder with a buffering function, comprising:
[0007] A cover sleeve, on which a first oil port is opened;
[0008] A cylinder body, which is inserted into the cover sleeve, and the cylinder body is detachably connected to the cover sleeve, and a second oil port is opened on the cylinder body;
[0009] A first-stage telescopic rod, which is sleeved in the cylinder body and can axially move;
[0010] A pushing body, which is arranged in the first-stage telescopic rod, and one end of the pushing body is in contact with the cover sleeve;
[0011] The second-stage telescopic rod is sleeved in the first-stage telescopic rod in an axially movable manner. The second-stage telescopic rod abuts against the other end of the pushing body, and the second-stage telescopic rod is pushed axially by the pushing body to move axially;
[0012] When the first oil port is opened and the second oil port is closed, hydraulic oil is introduced into the first oil port, and the pushing body pushes the first-stage telescopic rod and the second-stage telescopic rod to extend out of the cylinder block synchronously;
[0013] When the first oil port is opened and the second oil port is closed, the first oil port discharges hydraulic oil. Depending on the self-gravity of the first-stage telescopic rod and the second-stage telescopic rod respectively, the first-stage telescopic rod and the second-stage telescopic rod retract into the cylinder block synchronously.
[0014] Optionally, there is a first cavity between the first-stage telescopic rod and the cylinder block, and a second cavity between the first-stage telescopic rod and the second-stage telescopic rod. The first cavity is communicated with the second cavity.
[0015] Optionally, an oil passage hole is formed in the first-stage telescopic rod, and the oil passage hole communicates the first cavity with the second cavity.
[0016] Optionally, a first buffer port is provided between the pushing body and the second-stage telescopic rod, and the first buffer port leads to the oil passage hole.
[0017] Optionally, there is a second buffer port between the second-stage telescopic rod and the pushing body. Among them, one end of the second-stage telescopic rod close to the pushing body has a first buffer shaft, and there is a second buffer port between the first buffer shaft and the pushing body. The addition of the first buffer shaft is to play a role in pushing and buffering.
[0018] Optionally, there is a third buffer port between the pushing body and the cover sleeve.
[0019] Optionally, a second buffer shaft is provided on the pushing body, and there is a fourth buffer port between the second buffer shaft and the cover sleeve. The addition of the second buffer shaft is to play a role in pushing and buffering.
[0020] Optionally, a guide ring is sleeved outside the first-stage telescopic rod. The first-stage telescopic rod can axially move relative to the cylinder block in the cylinder block through the guide ring. A guide ring is sleeved outside the second-stage telescopic rod. The second-stage telescopic rod can axially move relative to the first-stage telescopic rod in the first-stage telescopic rod through the guide ring.
[0021] Optionally, the cover sleeve and the cylinder block are sealed by a sealing member. The first-stage telescopic rod and the cylinder block are sealed by a sealing member. The first-stage telescopic rod and the pushing body are sealed by a sealing member. The first-stage telescopic rod and the second-stage telescopic rod are sealed by a sealing member.
[0022] The beneficial effects of the present utility model:
[0023] 1. In the present utility model, when the first oil port is opened and the second oil port is closed, hydraulic oil is introduced into the first oil port, and the pushing body pushes the first-stage telescopic rod and the second-stage telescopic rod to extend synchronously out of the cylinder block. When the first oil port is opened and the second oil port is closed, and the first oil port discharges hydraulic oil, relying on the self-gravity of the first-stage telescopic rod and the second-stage telescopic rod respectively, the first-stage telescopic rod and the second-stage telescopic rod retract synchronously into the cylinder block, realizing the synchronous extension and retraction of the first-stage telescopic rod and the second-stage telescopic rod in the oil cylinder.
[0024] 2. When the first buffer port and the second buffer port of the present utility model are filled with hydraulic oil, it can push the second-stage telescopic rod to extend out of the oil cylinder, and the hydraulic oil in the first buffer port and the second buffer port can buffer the retraction of the second-stage telescopic rod into the oil cylinder. When the third buffer port and the fourth buffer port are filled with hydraulic oil, it can push the first-stage telescopic rod to extend out of the oil cylinder, and the hydraulic oil in the first buffer port and the second buffer port can buffer the retraction of the first-stage telescopic rod into the oil cylinder, realizing the synchronous and stable extension and retraction of the two-stage telescopic rod. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0026] Figure 1 It is a schematic half-sectional structure diagram of the present utility model;
[0027] Figure 2 It is a schematic half-sectional structure diagram of the left half part of the present utility model;
[0028] Figure 3 It is a schematic half-sectional structure diagram of the right half part of the present utility model.
[0029] Reference numerals: 1 - cover sleeve; 2 - first oil port; 3 - first-stage telescopic; 4 - pushing body; 5 - oil passage hole; 6 - cylinder block; 7 - first cavity; 8 - second oil port; 9 - second cavity; 10 - second-stage telescopic rod; 11 - first buffer port; 12 - first buffer shaft; 13 - second buffer port; 14 - third buffer port; 15 - second buffer shaft; 16 - fourth buffer port; 17 - seal; 18 - guide ring. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0030] The following will describe the embodiments of the present application in detail with reference to the drawings.
[0031] Embodiment 1
[0032] As Figure 1As shown in the figure, this embodiment provides a synchronous telescopic multi-stage hydraulic cylinder with a buffering function, including: a cover sleeve 1, a first-stage telescopic rod 3, a pushing body 4, a cylinder body 6, and a second-stage telescopic rod 10. A first oil port 2 is opened on the cover sleeve 1. The cylinder body 6 is inserted into the cover sleeve 1, and the cylinder body 6 is detachably connected to the cover sleeve 1. A second oil port 8 is opened on the cylinder body 6. The first-stage telescopic rod 3 is sleeved in the cylinder body 6 and can move axially. The pushing body 4 is arranged in the first-stage telescopic rod 3. The left end of the pushing body 4 is in contact with the cover sleeve 1. The second-stage telescopic rod 10 is sleeved in the first-stage telescopic rod 3 and can move axially. The second-stage telescopic rod 10 abuts against the right end of the pushing body 4. The second-stage telescopic rod 10 is pushed by the pushing body 4 to move axially.
[0033] When the first oil port 2 is opened and the second oil port 8 is closed, hydraulic oil is introduced into the first oil port 2, and the pushing body 4 pushes the first-stage telescopic rod 3 and the second-stage telescopic rod 10 to synchronously extend out of the cylinder body 6;
[0034] When the first oil port 2 is opened and the second oil port 8 is closed, the first oil port 2 discharges hydraulic oil. Relying on the self-gravity of the first-stage telescopic rod 3 and the second-stage telescopic rod 10 respectively, the first-stage telescopic rod 3 and the second-stage telescopic rod 10 synchronously retract into the cylinder body 6.
[0035] There is a first cavity 7 between the first-stage telescopic rod 3 and the cylinder body 6, and a second cavity 9 between the first-stage telescopic rod 3 and the second-stage telescopic rod 10. The first cavity 7 is communicated with the second cavity 9. Specifically, an oil through-hole 5 is opened on the first-stage telescopic rod 3, and the oil through-hole 5 communicates the first cavity 7 with the second cavity 9. The hydraulic oil in the first cavity 7 is communicated with the hydraulic oil in the second cavity 9 through the oil through-hole 5.
[0036] A first buffer port 11 is provided between the pushing body 4 and the second-stage telescopic rod 10, and the first buffer port 11 leads to the oil through-hole 5. The hydraulic oil in the first buffer port 11 pushes the second-stage telescopic rod 10 to extend out of the cylinder body 6, and the hydraulic oil in the first buffer port 11 buffers the second-stage telescopic rod 10 when it retracts into the cylinder body 6.
[0037] There is a second buffer port 13 between the second-stage telescopic rod 10 and the pushing body 4. Specifically, one end of the second-stage telescopic rod 10 close to the pushing body 4 or the left end of the second-stage telescopic rod 10 has a first buffer shaft 12, and there is a second buffer port 13 between the first buffer shaft 12 and the pushing body 4. Similarly, the hydraulic oil in the second buffer port 13 pushes the second-stage telescopic rod 10 to extend out of the cylinder body 6, and the hydraulic oil in the second buffer port 13 buffers the second-stage telescopic rod 10 when it retracts into the cylinder body 6.
[0038] There is a third buffer port 14 between the driving body 4 and the cover sleeve 1. In addition, a second buffer shaft 15 is provided at the left end of the driving body 4, and there is a fourth buffer port 16 between the second buffer shaft 15 and the cover sleeve 1. The hydraulic oil in the third buffer port 14 and the fourth buffer port 16 pushes the first-stage telescopic rod 3 to extend out of the cylinder block 6, and the hydraulic oil in the third buffer port 14 and the fourth buffer port 16 buffers the first-stage telescopic rod 3 when it retracts into the cylinder block 6.
[0039] Embodiment 2
[0040] Based on Embodiment 1, as Figure 1 shown, the working principle of the present utility model is: The first cavity 7 and the second cavity 9 are filled with hydraulic oil itself;
[0041] When the multi-stage hydraulic cylinder extends, the first oil port 2 is opened for oil supply (the third buffer port 14 and the fourth buffer port 16 supply oil), the second oil port 8 is closed, and the driving body 4 pushes the first-stage telescopic rod 3 to extend out of the cylinder block 6. Since the first cavity 7 is filled with hydraulic oil, the hydraulic oil in the first cavity 7 (because the volume of the first cavity 7 decreases) is discharged into the first buffer port 11 and the second buffer port 13 through the oil passing hole 5. The hydraulic oil in the first buffer port 11 and the hydraulic oil in the second buffer port 13 push the second-stage telescopic rod 10 to extend out of the cylinder block 6. During the process of the second-stage telescopic rod 10 extending out of the cylinder block 6, the hydraulic oil in the second cavity 9 (because the volume of the second cavity 9 decreases) is discharged into the first buffer port 11 and the second buffer port 13, realizing the synchronous extension of the two-stage telescopic rods. There is no stage change during the full stroke of the oil cylinder 6, achieving a smooth extension.
[0042] When the multi-stage hydraulic cylinder retracts, the first oil port 2 is opened for oil discharge (the third buffer port 14 and the fourth buffer port 16 discharge oil), the second oil port 8 is closed, and the first-stage telescopic rod 3 and the second-stage telescopic rod 10 retract synchronously under the action of their own dead weights (i.e., external forces). During the retraction process of the first-stage telescopic rod 3 (because the volume of the first cavity 7 increases), the hydraulic oil in the first buffer port 11 and the hydraulic oil in the second buffer port 13 are discharged into the first cavity 7 through the oil passing hole 5. During the retraction process of the second-stage telescopic rod 10 (because the volume of the second cavity 9 increases), the hydraulic oil in the first buffer port 11 and the hydraulic oil in the second buffer port 13 are discharged into the second cavity 9. During the retraction process of the first-stage telescopic rod 3 and the second-stage telescopic rod 10, the synchronous retraction of the two-stage telescopic cylinders is realized. There is no stage change during the full stroke of the oil cylinder 6, achieving a smooth retraction.
[0043] The first oil port 2 and the second oil port 8 are separated. The first oil port 2 is used for oil supply and discharge of the third buffer port 14 and the fourth buffer port 16, and the second oil port 8 is used for oil supply and discharge of the first cavity 7 and the second cavity 9.
[0044] Embodiment 3
[0045] Based on Embodiment 2, as Figure 1As shown, since the first oil port 2 and the second oil port 8 are separated, the first cavity 7 and the second cavity 9 are separated from the first oil port 2.
[0046] Since the first oil port 2 and the second oil port 8 are separated, the first buffer port 11 and the second buffer port 13 are a set of buffer ports, and the third buffer port 14 and the fourth buffer port 16 are another set of buffer ports.
[0047] The hydraulic oil filled in the first buffer port 11 and the second buffer port 13 can push the second-stage telescopic rod 10 to extend out of the oil cylinder 6, and the hydraulic oil in the first buffer port 11 and the second buffer port 13 can buffer the retraction of the second-stage telescopic rod 10 into the oil cylinder 6.
[0048] The hydraulic oil filled in the third buffer port 14 and the fourth buffer port 16 can push the first-stage telescopic rod 3 to extend out of the oil cylinder 6, and the hydraulic oil in the first buffer port 11 and the second buffer port 13 can buffer the retraction of the first-stage telescopic rod 3 into the oil cylinder 6.
[0049] Thus, during the synchronous telescopic process of the first-stage telescopic rod 3 and the second-stage telescopic rod 10, the hydraulic oil between the first cavity 7 and the second cavity 9 is recycled (provided that the second oil port 8 is closed, and the second oil port 8 can replenish hydraulic oil for the first cavity 7 and the second cavity 9), so the volume of the hydraulic oil in the first cavity 7 and the second cavity 9 remains unchanged. During the synchronous telescopic process of the first-stage telescopic rod 3 and the second-stage telescopic rod 10, the first oil port 2 is open. The first oil port 2 either supplies oil to make the first-stage telescopic rod 3 and the second-stage telescopic rod 10 extend synchronously, or discharges oil to make the first-stage telescopic rod 3 and the second-stage telescopic rod 10 retract synchronously.
[0050] Embodiment 4
[0051] As Figures 2 - 3 shown, a guide ring 18 is sleeved outside the first-stage telescopic rod 3. The first-stage telescopic rod 3 can axially move relative to the cylinder block 6 within the cylinder block 6 through the guide ring 18. A guide ring 18 is sleeved outside the second-stage telescopic rod 10. The second-stage telescopic rod 10 can axially move relative to the first-stage telescopic rod 3 within the first-stage telescopic rod 3 through the guide ring 18.
[0052] As Figures 2 - 3 shown, between the cover sleeve 1 and the cylinder block 6 is sealed by a seal 17. Between the first-stage telescopic rod 3 and the cylinder block 6 is sealed by a seal 17. Between the first-stage telescopic rod 3 and the pusher 4 is sealed by a seal 17. Between the first-stage telescopic rod 3 and the second-stage telescopic rod 10 is sealed by a seal 17. The first oil port 2 and the second oil port 8 are separated by the seal 17, and the hydraulic oil in the first cavity 7 and the second cavity 9 is separated from the outside of the cylinder block 6 by the seal 17.
[0053] The above are only the specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope recorded by the present utility model can easily think of changes or substitutions, which should all be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the said claims.
Claims
1. A synchronous telescopic multi-stage hydraulic cylinder with buffering effect, characterized in that: include: A cover sleeve (1), wherein the cover sleeve (1) is provided with a first oil port (2); A cylinder body (6), the cylinder body (6) is inserted into the cover sleeve (1), the cylinder body (6) is detachably connected to the cover sleeve (1), and a second oil port (8) is provided on the cylinder body (6); A first-stage telescopic rod (3), the first-stage telescopic rod (3) being axially movable and sleeved in the cylinder body (6); A pushing body (4), the pushing body (4) being arranged in the first-stage telescopic rod (3), and one end of the pushing body (4) being in contact with the cover sleeve (1); A second-stage telescopic rod (10), the second-stage telescopic rod (10) is axially movable and sleeved inside the first-stage telescopic rod (3), the second-stage telescopic rod (10) abuts against the other end of the pushing body (4), and the second-stage telescopic rod (10) is pushed by the pushing body (4) to move axially; The first oil port (2) is opened, the second oil port (8) is closed, hydraulic oil is passed into the first oil port (2), and the pushing body (4) pushes the first-stage telescopic rod (3) and the second-stage telescopic rod (10) to extend synchronously out of the cylinder body (6); The first oil port (2) is opened, the second oil port (8) is closed, the first oil port (2) discharges hydraulic oil, and the first-stage telescopic rod (3) and the second-stage telescopic rod (10) are synchronously retracted into the cylinder body (6) by relying on their own weights.
2. A synchronous telescopic multi-stage hydraulic cylinder with buffering effect according to claim 1, characterized in that: A first cavity (7) is provided between the first-stage telescopic rod (3) and the cylinder body (6), a second cavity (9) is provided between the first-stage telescopic rod (3) and the second-stage telescopic rod (10), and the first cavity (7) and the second cavity (9) are in communication.
3. A synchronous telescopic multi-stage hydraulic cylinder with buffering effect according to claim 2, characterized in that: The first-stage telescopic rod (3) is provided with an oil hole (5), and the oil hole (5) communicates with the first cavity (7) and the second cavity (9).
4. The synchronous telescopic multi-stage hydraulic cylinder with buffering function according to claim 2, characterized in that: A first buffer opening (11) is provided between the pushing body (4) and the second-stage telescopic rod (10), and the first buffer opening (11) leads to the oil passage hole (5).
5. The synchronous telescopic multi-stage hydraulic cylinder with buffering function according to claim 1, characterized in that: A second buffer opening (13) is provided between the second-stage telescopic rod (10) and the pushing body (4), wherein the end of the second-stage telescopic rod (10) close to the pushing body (4) has a first buffer shaft (12), and the second buffer opening (13) is provided between the first buffer shaft (12) and the pushing body (4).
6. The synchronous telescopic multi-stage hydraulic cylinder with buffering function according to claim 1, characterized in that: A third buffer opening (14) is provided between the pushing body (4) and the cover sleeve (1).
7. A synchronous telescopic multi-stage hydraulic cylinder with buffering function according to claim 6, characterized in that: The pusher (4) is provided with a second buffer shaft (15), and a fourth buffer opening (16) is provided between the second buffer shaft (15) and the cover sleeve (1).
8. The synchronous telescopic multi-stage hydraulic cylinder with buffering function according to claim 1, characterized in that: The first-stage telescopic rod (3) is provided with a guide ring (18) on its outer sleeve, and the first-stage telescopic rod (3) can move axially in the cylinder body (6) relative to the cylinder body (6) through the guide ring (18); the second-stage telescopic rod (10) is provided with a guide ring (18) on its outer sleeve, and the second-stage telescopic rod (10) can move axially in the first-stage telescopic rod (3) relative to the first-stage telescopic rod (3) through the guide ring (18).
9. The synchronous telescopic multi-stage hydraulic cylinder with buffering function according to claim 1, characterized in that: The cover sleeve (1) and the cylinder body (6) are sealed by a seal (17), the first-stage telescopic rod (3) and the cylinder body (6) are sealed by the seal (17), the first-stage telescopic rod (3) and the pushing body (4) are sealed by a seal (17), and the first-stage telescopic rod (3) and the second-stage telescopic rod (10) are sealed by a seal (17).