Multi-cavity hydraulic cylinder
By designing the oil groove and ball structure in the hydraulic cylinder, the problem of stuck during the movement of the multi-stage hydraulic cylinder is solved, better sealing and lubrication effects are achieved, and service life is extended.
Patent Information
- Application Number
- CN202422634405.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-30
- Publication Date
- 2025-08-01
- Estimated Expiration
- 2034-10-30
Smart Images
Figure CN223177861U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of hydraulic cylinders, in particular to a multi-chamber hydraulic cylinder. Background Art
[0002] A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and then makes a linear reciprocating motion. Among them, a multi-stage hydraulic cylinder has the advantages of a long stroke and a compact structure, and its application range is becoming wider and wider. The multi-stage hydraulic cylinder is formed by sleeving multiple piston cylinders, thereby forming multiple chambers. Therefore, the isolation between the chambers is crucial. In the prior art, multiple O-ring seals are commonly used for sealing isolation. However, the phenomenon of jamming is likely to occur, and the problem of jamming will occur during the movement of multiple piston cylinders, which greatly affects the use effect. Summary of the Utility Model
[0003] The purpose of the utility model is to provide a multi-chamber hydraulic cylinder that reduces jamming.
[0004] In order to achieve the above-mentioned utility model purpose, the following technical solutions are adopted for the multi-chamber hydraulic cylinder of the utility model:
[0005] A multi-chamber hydraulic cylinder includes a first cylinder barrel and a first through pipe disposed inside the first cylinder barrel. A second cylinder barrel is disposed inside the first cylinder barrel. A first piston that movably penetrates the first through pipe is provided at the lower end of the second cylinder barrel. The first piston divides the first cylinder barrel into a first upper chamber and a first lower chamber. A second through pipe is provided inside the second cylinder barrel. The second through pipe is concentric with the first through pipe. A piston rod is provided inside the second cylinder barrel. A second piston that movably penetrates the second through pipe is provided at the lower end of the piston rod. The second piston divides the second cylinder barrel into a second upper chamber and a second lower chamber. Oil grooves are provided on the inner wall of the first cylinder barrel, the inner wall of the second cylinder barrel, the outer wall of the first through pipe, and the outer wall of the second through pipe. A rubber layer is provided on the groove wall of the oil groove. A convex portion with a wavy structure is provided at the position of the rubber layer at the notch of the oil groove. An outer sealing ring and outer balls are provided between the outer wall of the first piston and the inner wall of the first cylinder barrel, and an inner sealing ring and inner balls are provided between the inner wall of the first piston and the outer wall of the first through pipe, and between the outer wall of the second piston and the inner wall of the second cylinder barrel, and between the inner wall of the second piston and the outer wall of the second through pipe.
[0006] Preferably, both the outer sealing ring and the inner sealing ring are made of rubber material. Elastic support members are provided inside both the outer sealing ring and the inner sealing ring. The elastic support members are made of metal material. The elastic support members are arranged in a wavy shape, and the elastic support members are arranged in a circle along the circumferential direction of the outer sealing ring or the inner sealing ring. By providing elastic support for the inner sealing ring or the outer sealing ring through the elastic support members provided inside the outer sealing ring and the inner sealing ring, the sealing effect is improved.
[0007] Preferably, upper buffer components are provided on the top walls of the first cylinder barrel and the second cylinder barrel, and lower buffer components are provided at the bottoms of the first piston and the second piston. By providing the upper buffer components in the present utility model, when the hydraulic cylinder moves forward quickly until it is fully extended, at this time, there will be no impact wear between the first piston and the first cylinder barrel and between the second piston and the second cylinder barrel; meanwhile, by providing the lower buffer components, when the hydraulic cylinder is fully contracted, wear is reduced and the service life of the hydraulic cylinder is prolonged.
[0008] Preferably, the upper buffer component includes upper stepped grooves provided on the top walls of the first cylinder barrel and the second cylinder barrel. Upper insertion blocks are provided at the tops of the first piston and the second piston, and the upper insertion blocks are inserted into the upper stepped grooves. An upper spring is provided at the bottom of the upper stepped groove, and the upper spring contacts the upper insertion block. The upper buffer component of the present utility model provides buffering through the upper spring, so that when the piston approaches the top wall of the cylinder barrel, it moves slowly under the elastic action of the upper spring and does not impact the cylinder barrel.
[0009] Preferably, the lower buffer component includes lower stepped grooves provided at the bottoms of the first piston and the second piston. Lower insertion blocks are provided on the bottom walls of the first cylinder barrel and the second cylinder barrel, and the lower insertion blocks are inserted into the lower stepped grooves. A lower spring is provided at the bottom of the lower stepped groove, and the lower spring contacts the lower insertion block. The lower buffer component of the present utility model provides buffering through the lower spring, so that when the piston approaches the bottom wall of the cylinder barrel, it moves slowly under the elastic action of the lower spring and does not impact the cylinder barrel.
[0010] Preferably, the outer sealing ring is provided in the middle of the outer wall of the first piston or the second piston, and the inner sealing ring is provided at the lower part of the inner wall of the first piston or the second piston; the outer ball is provided at the edge of the outer wall of the first piston or the second piston, and the inner ball is provided at the upper middle part of the inner wall of the first piston or the second piston.
[0011] Preferably, a first flow passage is formed between the first through pipe and the second through pipe; a second flow passage is formed between the second through pipe and the inner wall of the piston rod; a first passage communicating the first flow passage and the first upper chamber is provided inside the first piston; a second passage communicating the second flow passage and the second upper chamber is provided inside the second piston; a third passage communicating the first lower chamber and the second lower chamber is provided inside the first piston; the first cylinder barrel is provided with two oil ports, one of which is connected to the first through pipe and the other is connected to the first lower chamber.
[0012] Preferably, the oil groove is semicircular, the diameter of the oil groove is 1 cm, and the thickness of the rubber layer is 2 mm.
[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0014] 1. By providing an oil sump in the present utility model, since the size of the oil sump is small and the tank wall of the oil sump is provided with a rubber layer, the hydraulic oil is easily attached to the rubber layer of the oil sump. Moreover, the rubber layer is provided with a convex portion having a wavy structure at the position of the oil sump opening, so that the hydraulic oil is not easily slipped from the oil sump. Therefore, when contacting the first piston or the second piston, the lubrication degree is increased, and the jamming phenomenon during the movement of the piston is reduced. At the same time, the provision of the oil sump also reduces the contact area, reduces the frictional force, and further reduces the jamming;
[0015] 2. By providing inner balls and outer balls in the present utility model, the frictional force is reduced through rolling contact. At the same time, under the action of the hydraulic oil, a lubricating effect is provided, and the jamming problem during the movement is further reduced. The structure is simple and practical. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 is a schematic structural view of the present utility model;
[0017] Figure 2 is Figure 1 an enlarged view of part A of
[0018] Figure 3 is Figure 2 an enlarged view of part D of
[0019] Figure 4 is Figure 1 an enlarged view of part B of
[0020] Figure 5 is Figure 1 an enlarged view of part C of
[0021] Figure 6 is a schematic structural view of the outer sealing ring;
[0022] Figure 7 is Figure 6 an enlarged view of part E of
[0023] Wherein, 1 is the first cylinder barrel, 2 is the second piston, 3 is the first upper chamber, 4 is the second flow passage, 5 is the second cylinder barrel, 6 is the second upper chamber, 7 is the piston rod, 8 is the second through pipe, 9 is the first through pipe, 10 is the third passage, 11 is the oil port, 12 is the first lower chamber, 13 is the first piston, 14 is the second lower chamber, 15 is the first flow passage, 16 is the lower stepped groove, 17 is the lower insert block, 18 is the second passage, 19 is the oil sump, 20 is the lower spring, 21 is the outer ball, 22 is the outer sealing ring, 23 is the inner ball, 24 is the inner sealing ring, 25 is the upper insert block, 26 is the upper stepped groove, 27 is the upper spring, 28 is the elastic support member, 29 is the rubber layer, 30 is the convex portion, 31 is the first passage. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0024] The present utility model will be further illustrated in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present utility model and not to limit the scope of the present utility model. After reading the present utility model, various equivalent forms of modification made by those skilled in the art to the present utility model all fall within the scope defined by the appended claims of this application.
[0025] As Figure 1-7As shown in the figure, a multi-chamber hydraulic cylinder includes a first cylinder barrel 1 and a first through pipe 9 disposed inside the first cylinder barrel 1. A second cylinder barrel 5 is disposed inside the first cylinder barrel 1. A first piston 13 that movably penetrates the first through pipe 9 is provided at the lower end of the second cylinder barrel 5. The first piston 13 divides the first cylinder barrel 1 into a first upper chamber 3 and a first lower chamber 12. A second through pipe 8 is provided inside the second cylinder barrel 5. The second through pipe 8 is concentrically arranged with the first through pipe 9. A piston rod 7 is provided inside the second cylinder barrel 5. A second piston 2 that movably penetrates the second through pipe 8 is provided at the lower end of the piston rod 7. The second piston 2 divides the second cylinder barrel 5 into a second upper chamber 6 and a second lower chamber 14. A first flow passage 15 is formed between the first through pipe 9 and the second through pipe 8. A second flow passage 4 is formed between the second through pipe 8 and the inner wall of the piston rod 7. A first passage 31 that communicates the first flow passage 15 and the first upper chamber 3 is provided inside the first piston 13. A second passage 18 that communicates the second flow passage 4 and the second upper chamber 6 is provided inside the second piston 2. A third passage 10 that communicates the first lower chamber 12 and the second lower chamber 14 is provided inside the first piston 13. The first cylinder barrel 1 is provided with two oil ports 11. One of the oil ports 11 is connected to the first through pipe, and the other oil port 11 is connected to the first lower chamber 12. Oil grooves 19 are provided on the inner wall of the first cylinder barrel 1, the inner wall of the second cylinder barrel 5, the outer wall of the first through pipe 9, and the outer wall of the second through pipe 8. The oil grooves 19 are set to be semi-circular. The diameter of the oil grooves 19 is 1 cm. A rubber layer 29 is provided on the groove wall of the oil grooves 19. The thickness of the rubber layer 29 is 2 mm. A convex portion 30 with a wavy structure is provided at the position of the rubber layer 29 at the notch of the oil grooves 19. An outer sealing ring 22 and outer balls 21 are provided between the outer wall of the first piston 13 and the inner wall of the first cylinder barrel 1, and between the outer wall of the second piston 2 and the inner wall of the second cylinder barrel 5. An inner sealing ring 24 and inner balls 23 are provided between the inner wall of the first piston 13 and the outer wall of the first through pipe 9, and between the inner wall of the second piston 2 and the outer wall of the second through pipe 8. The outer sealing ring 22 is provided in the middle of the outer wall of the first piston 13 or the second piston 2. The inner sealing ring 24 is provided at the lower part of the inner wall of the first piston 13 or the second piston 2. The outer balls 21 are provided at the edge of the outer wall of the first piston 13 or the second piston 2. The inner balls 23 are provided in the upper middle part of the inner wall of the first piston 13 or the second piston 2. Both the outer sealing ring 22 and the inner sealing ring 24 are made of rubber material. Elastic support members 28 are provided inside both the outer sealing ring 22 and the inner sealing ring 24. The elastic support members 28 are made of metal material. The elastic support members 28 are set to be wavy. The elastic support members 28 are arranged in a circle along the circumferential direction of the outer sealing ring 22 or the inner sealing ring 24. Upper buffer components are provided on the top walls of both the first cylinder barrel 1 and the second cylinder barrel 5. Lower buffer components are provided at the bottoms of both the first piston 13 and the second piston 2. The upper buffer component includes upper stepped grooves 26 provided on the top walls of the first cylinder barrel 1 and the second cylinder barrel 5. Upper insertion blocks 25 are provided on the tops of both the first piston 13 and the second piston 2. The upper insertion blocks 25 are inserted into the upper stepped grooves 26. An upper spring 27 is provided at the bottom of the upper stepped grooves 26. The upper spring 27 contacts the upper insertion blocks 25.The lower buffer assembly includes lower stepped grooves 16 provided at the bottom of the first piston 13 and the bottom of the second piston 2. Lower inserting blocks 17 are provided on the bottom walls of the first cylinder barrel 1 and the second cylinder barrel 5. The lower inserting blocks 17 are inserted into the lower stepped grooves 16. A lower spring 20 is provided at the bottom of the lower stepped groove 16, and the lower spring 20 contacts the lower inserting blocks 17.
[0026] The specific working process and principle of the present utility model: When the hydraulic cylinder contracts, hydraulic oil enters the first through pipe 9 from one of the oil ports 11. Then, a part of the hydraulic oil enters the first flow channel 15 and enters the first upper chamber 3 through the first channel 31 of the first piston 13, pushing the first piston 13 downward. The first piston 13 pushes the hydraulic oil in the first lower chamber 12 into the other oil port 11 for discharge. At the same time, another part of the hydraulic oil after entering the first channel 31 will continue to flow into the second flow channel 4 along the second through pipe 8, and then enter the second upper chamber 6 through the second channel 18, pushing the second piston 2 downward. At this time, the second piston 2 pushes the hydraulic oil in the second lower chamber 14 into the third channel 10, then into the first lower chamber 12, and then into the other oil port 11 for discharge; when the hydraulic cylinder extends, the hydraulic oil enters the first lower chamber 12 through the oil port 11, and then enters the second lower chamber 14 along the third channel 10, thereby pushing the first piston 13 and the second piston 2 upward. At this time, the hydraulic oil in the first upper chamber 3 enters the first flow channel 15 through the first channel 31, and the hydraulic oil in the second upper chamber 6 enters the second flow channel 4 through the second channel 18, and finally enters the first through pipe 9 and is discharged from the other oil port 11.
[0027] Wherein, oil grooves 19 are provided on the inner walls of the first cylinder barrel 1, the inner walls of the second cylinder barrel 5, the outer walls of the first through pipe 9, and the outer walls of the second through pipe 8. Since the size of the oil grooves 19 is small, and a rubber layer 29 is provided on the groove walls of the oil grooves 19, the hydraulic oil is easily attached to the rubber layer 29 of the oil grooves 19. Moreover, the rubber layer 29 is provided with a convex portion 30 having a wavy structure at the position of the groove opening of the oil grooves 19, so that the hydraulic oil is not easily slipped from the oil grooves 19. Thus, when contacting the first piston 13 or the second piston 2, the lubrication degree is increased. Moreover, the setting of the oil grooves 19 also reduces the contact area and reduces the friction force; at the same time, in combination with the setting of the outer ball 21 and the inner ball 23, the friction force is reduced by rolling contact, and a lubricating effect is provided under the action of the hydraulic oil, further reducing the jamming problem during movement. The structure is simple and practical.
[0028] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front", "center", "both ends", 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. Therefore, it should not be construed as a limitation to the present utility model.
[0029] In the present utility model, unless otherwise clearly defined and limited, the terms "installed", "set", "connected", "fixed", "swivelly connected", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. It can be the communication inside two elements or the interaction relationship between two elements. Unless otherwise clearly defined, 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 circumstances.
[0030] The above description shows and describes the preferred embodiments of the present utility model. As mentioned above, it should be understood that the present utility model is not limited to the form disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the inventive concept described herein through the above teachings or the techniques or knowledge in the relevant field. And the changes and modifications made by those skilled in the art without departing from the spirit and scope of the present utility model should all be within the protection scope of the appended claims of the present utility model.
Claims
1. A multi-chamber hydraulic cylinder, comprising a first cylinder barrel and a first through pipe arranged inside the first cylinder barrel. A second cylinder barrel is arranged inside the first cylinder barrel. A first piston that movably penetrates the first through pipe is provided at the lower end of the second cylinder barrel. The first piston divides the first cylinder barrel into a first upper chamber and a first lower chamber. A second through pipe is arranged inside the second cylinder barrel. The second through pipe is concentric with the first through pipe. A piston rod is arranged inside the second cylinder barrel. A second piston that movably penetrates the second through pipe is provided at the lower end of the piston rod. The second piston divides the second cylinder barrel into a second upper chamber and a second lower chamber. It is characterized in that: The inner walls of the first cylinder barrel, the inner walls of the second cylinder barrel, the outer walls of the first through pipe, and the outer walls of the second through pipe are all provided with oil grooves. The groove walls of the oil grooves are provided with rubber layers, and the rubber layers are provided with convexities with a wavy structure at the positions of the oil groove openings; between the outer wall of the first piston and the inner wall of the first cylinder barrel, and between the outer wall of the second piston and the inner wall of the second cylinder barrel, outer sealing rings and outer balls are provided. Between the inner wall of the first piston and the outer wall of the first through pipe, and between the inner wall of the second piston and the outer wall of the second through pipe, inner sealing rings and inner balls are provided.
2. The multi-chamber hydraulic cylinder according to claim 1, wherein: The outer sealing rings and the inner sealing rings are both made of rubber material. Elastic support members are provided inside the outer sealing rings and the inner sealing rings. The elastic support members are made of metal material. The elastic support members are arranged in a wavy shape, and the elastic support members are arranged in a circle along the circumferences of the outer sealing rings or the inner sealing rings.
3. The multi-chamber hydraulic cylinder according to claim 1, wherein: Upper buffer components are provided on the top walls of the first cylinder barrel and the second cylinder barrel, and lower buffer components are provided at the bottoms of the first piston and the second piston.
4. The multi-chamber hydraulic cylinder according to claim 3, wherein: The upper buffer components include upper stepped grooves provided on the top walls of the first cylinder barrel and the second cylinder barrel. Upper insertion blocks are provided at the tops of the first piston and the second piston. The upper insertion blocks are inserted into the upper stepped grooves. Upper springs are provided at the bottoms of the upper stepped grooves, and the upper springs are in contact with the upper insertion blocks.
5. The multi-chamber hydraulic cylinder according to claim 3, characterized in that: The lower buffer components include lower stepped grooves provided at the bottoms of the first piston and the second piston. Lower insertion blocks are provided on the bottom walls of the first cylinder barrel and the second cylinder barrel. The lower insertion blocks are inserted into the lower stepped grooves. Lower springs are provided at the bottoms of the lower stepped grooves, and the lower springs are in contact with the lower insertion blocks.
6. The multi-chamber hydraulic cylinder according to claim 1, characterized in that: The outer sealing rings are provided in the middle of the outer walls of the first piston or the second piston, and the inner sealing rings are provided at the lower parts of the inner walls of the first piston or the second piston; the outer balls are provided at the edges of the outer walls of the first piston or the second piston, and the inner balls are provided in the upper middle parts of the inner walls of the first piston or the second piston.
7. The multi-chamber hydraulic cylinder according to claim 1, wherein: A first flow passage is formed between the first through pipe and the second through pipe, and a second flow passage is formed between the second through pipe and the inner wall of the piston rod; a first passage communicating the first flow passage and the first upper chamber is provided inside the first piston, and a second passage communicating the second flow passage and the second upper chamber is provided inside the second piston; a third passage communicating the first lower chamber and the second lower chamber is provided inside the first piston; the first cylinder barrel is provided with two oil ports, one of the oil ports is connected to the first through pipe, and the other oil port is connected to the first lower chamber.
8. The multi-chamber hydraulic cylinder according to claim 1, characterized in that: The oil grooves are arranged in a semi-circular shape, the diameter of the oil grooves is 1 cm, and the thickness of the rubber layer is 2 mm.