Double-section oil cylinder
By designing a double-section structure and corresponding hydraulic circuit in the oil cylinder, the problem of slow pushing of the existing oil cylinder piston rod is solved, and the rapid roll-out and low-cost production of the piston rod are achieved.
Patent Information
- Application Number
- CN202421802891.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-26
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-07-26
AI Technical Summary
The existing cylinder piston rods are slow to roll out, making it difficult to meet the demand for rapid rollout.
A double-section oil cylinder is designed, including two cavity and a corresponding hydraulic circuit, and is squeezed into the first cavity through the second piston rod, indirectly driving the first piston rod to quickly push out.
It realizes the rapid launch of the piston rod, with simple structure and low processing cost.
Smart Images
Figure CN222910411U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of hydraulics, and particularly to a double-stage oil cylinder. Background Art
[0002] An oil cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and can perform linear reciprocating motion (or oscillating motion). It has a simple structure and reliable operation, and is widely used in the hydraulic systems of various machines. However, the pushing speed of the piston rod of the existing oil cylinder needs to be improved. Summary of the Invention
[0003] An object of the present application is to provide a double-stage oil cylinder, which can realize the rapid pushing of the piston rod and has a low manufacturing cost.
[0004] To achieve the above object, the technical solution adopted in the present application is: a double-stage oil cylinder, which includes a cylinder body, a first piston rod and a second piston rod. A first cavity and a second cavity are provided inside the cylinder body. The first cavity is arranged at one end of the second cavity along the length direction of the cylinder body. The first piston rod is slidably arranged in the first cavity, and the second piston rod is slidably arranged in the second cavity and is adapted to slide into the first cavity to push the first piston rod.
[0005] As a preference, the first piston rod includes a first rod body and a first plug body connected to each other. The second piston rod includes a second rod body and a second plug body connected to each other. The first rod body is arranged on the side away from the second piston rod and is separated from the inner wall of the first cavity. The first plug body is arranged on the side close to the second piston rod and is slidably abutted against the inner wall of the first cavity. The second rod body is arranged on the side close to the first plug body and is separated from the inner walls of the first cavity and the second cavity. The second plug body is arranged on the side away from the second plug body and is slidably abutted against the inner wall of the second cavity.
[0006] As a preference, a first seal is provided at one end of the first cavity away from the second cavity, and the first seal is arranged around between the first rod body and the cylinder body.
[0007] As a preference, a second seal is provided inside the cylinder body. The second seal divides the inner cavity of the cylinder body into the first cavity and the second cavity. A through hole is provided on the second seal, and the second piston rod passes through the through hole.
[0008] As a preference, the cylinder body includes a first shell and a second shell spliced with each other. The first shell forms the first cavity, and the second shell forms the second cavity.
[0009] As a preference, a first oil discharge hole, a first oil inlet hole communicating with the first cavity, a second oil discharge hole, and a second oil inlet hole communicating with the second cavity are provided on the cylinder block.
[0010] As a preference, the first oil discharge hole, the first oil inlet hole, the second oil discharge hole, and the second oil inlet hole are sequentially arranged on the same side of the cylinder block along the length direction of the cylinder block.
[0011] As a preference, the apertures of the outer sides of the first oil discharge hole, the first oil inlet hole, the second oil discharge hole, and the second oil inlet hole are larger than those of the inner sides.
[0012] As a preference, the end face of the second piston rod close to the first piston rod is adapted to abut against the first piston rod, and a first groove extending from the edge opposite to the first oil inlet hole towards the center is provided on this end face.
[0013] As a preference, a second groove extending from the second oil inlet hole towards the center is provided on the surface of the second cavity away from the first cavity.
[0014] Compared with the prior art, the beneficial effects of the present application are as follows: (1) Two cavities are provided to respectively form two hydraulic circuits. Among them, the hydraulic circuit connected to the first cavity directly drives the first piston rod, and the hydraulic circuit connected to the second cavity directly drives the second piston rod, causing the second piston rod to squeeze into the first cavity, thereby indirectly driving the first piston rod. With the boost of the second piston rod, the first piston rod can be quickly pushed out. (2) The structure of the double-stage oil cylinder is simple, and the processing and manufacturing cost is low. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 is a three-dimensional structural schematic diagram of a double-stage oil cylinder in some embodiments of the present application.
[0016] Figure 2 is an exploded structural schematic diagram of a double-stage oil cylinder in some embodiments of the present application.
[0017] Figure 3 is a cross-sectional structural schematic diagram of a double-stage oil cylinder in some embodiments of the present application.
[0018] Figure 4 is a structural schematic diagram of a second housing in some embodiments of the present application.
[0019] Figure 5 is Figure 4 a cross-sectional structural schematic diagram of the second housing shown in
[0020] Figure 6 is a structural schematic diagram of a second piston rod in some embodiments of the present application.
[0021] In the figure: 10, cylinder block; 11, first housing; 111, first cavity; 112, first oil discharge hole; 113, first oil inlet hole; 12, second housing; 121, second cavity; 122, second oil discharge hole; 123, second oil inlet hole; 124, second groove; 20, first seal; 30, first piston rod; 31, first rod body; 32, first plug body; 40, second seal; 50, second piston rod; 51, second rod body; 511, first groove; 52, second plug body. Specific embodiments
[0022] Next, in combination with specific embodiments, the present application will be further described. It should be noted that, on the premise of no conflict, the following-described embodiments or technical features can be arbitrarily combined to form new embodiments.
[0023] In the description of the present application, it should be noted that for orientation terms, such as terms "center", "horizontal", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the indicated orientation and position relationship are based on the orientation or position relationship shown in the drawings. It is only for the convenience of describing the present application 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 should not be construed as limiting the specific protection scope of the present application.
[0024] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence.
[0025] The terms "including" and "having" in the description and claims of the present application and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those clearly listed steps or units, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.
[0026] The present application provides a double-section oil cylinder, such as Figures 1 - 6As shown in the figure, it includes a cylinder block 10, a first piston rod 30 and a second piston rod 50. A first cavity 111 and a second cavity 121 are arranged inside the cylinder block 10. The first cavity 111 is arranged at one end of the second cavity 121 along the length direction of the cylinder block 10. The first piston rod 30 is slidably arranged in the first cavity 111, and the second piston rod 50 is slidably arranged in the second cavity 121 and is adapted to slide into the first cavity 111 to push the first piston rod 30. In this application, two cavities are provided to form two hydraulic circuits respectively. The hydraulic circuit connected to the first cavity 111 directly drives the first piston rod 30, and the hydraulic circuit connected to the second cavity 121 directly drives the second piston rod 50, so that the second piston rod 50 extrudes into the first cavity 111, thereby indirectly driving the first piston rod 30. With the boost of the second piston rod 50, the first piston rod 30 can be quickly pushed out. And the structure of the double-stage oil cylinder is simple, and the processing and manufacturing cost is low.
[0027] In some embodiments, the first piston rod 30 includes a first rod body 31 and a first plug body 32 connected to each other. The first rod body 31 is arranged on the side away from the second piston rod 50 and is separated from the inner wall of the first cavity 111. The first plug body 32 is arranged on the side close to the second piston rod 50 and is slidably abutted against the inner wall of the first cavity 111. In other words, the first plug body 32 abuts against the inner wall of the first cavity 111, and can divide the first cavity 111 into upper and lower parts. Among them, a space suitable for filling hydraulic oil is formed between the first rod body 31 and the inner wall of the first cavity 111, and another space suitable for filling hydraulic oil is formed between the surface of the first plug body 32 facing the second piston rod 50 and the second piston rod 50. Thus, by controlling the filling and discharging of hydraulic oil in the two spaces, the first piston rod 30 can be driven to extend / retract out of the cylinder block 10. Correspondingly, the second piston rod 50 includes a second rod body 51 and a second plug body 52 connected to each other. The second rod body 51 is arranged on the side close to the first plug body 32 and is separated from the inner walls of the first cavity 111 and the second cavity 121. The second plug body 52 is arranged on the side away from the second plug body 52 and is slidably abutted against the inner wall of the second cavity 121. By filling and discharging the hydraulic oil on the upper and lower sides of the second plug body 52, the second piston rod 50 can be driven to extend into the first cavity 111 or retract into the second cavity 121.
[0028] In some embodiments, a first seal 20 is arranged at one end of the first cavity 111 away from the second cavity 121. The first seal 20 is arranged around between the first rod body 31 and the cylinder block 10 to seal the first cavity 111, prevent the hydraulic oil in the first cavity 111 from leaking out, and prevent dust and impurities in the outside world from entering the first cavity 111 during the repeated telescoping process of the first piston rod 30.
[0029] In some embodiments, a second seal 40 is provided within the cylinder block 10. The second seal 40 divides the cavity inside the cylinder block 10 into a first cavity 111 and a second cavity 121, so that the hydraulic circuits of the first piston rod 30 and the second piston rod 50 are separated. A through hole is provided on the second seal 40, and the second piston rod 50 passes through the through hole. It can be understood that when the second piston rod 50 is retracted into the second cavity 121, at least part of the second rod body 51 still remains within the through hole and seals the through hole. In other words, within the sliding stroke range of the second piston rod 50, the second rod body 51 always passes through the through hole to close the through hole, and cooperates with the second seal 40 to achieve the isolation of the two hydraulic circuits.
[0030] In some embodiments, the cylinder block 10 includes a first housing 11 and a second housing 12 that are spliced together. The first housing 11 forms the first cavity 111, and the second housing 12 forms the second cavity 121. The housings are provided separately to facilitate the installation of the first piston rod 30, the second piston rod 50, the second seal 40, etc. to their corresponding positions within the cylinder block 10.
[0031] In some embodiments, the outer wall of the first housing 11 and the outer wall of the second housing 12 are coplanar, so that the outer surface of the cylinder block 10 is relatively flat and smooth.
[0032] In some embodiments, the inner walls of the ends where the first housing 11 and the second housing 12 are connected to each other are also coplanar. Further, the inner walls of the ends where the first housing 11 and the second housing 12 are connected to each other cooperate to form a card slot for setting the second seal 40.
[0033] In some embodiments, the first cavity 111 and the second cavity 121 are substantially cylindrical for easy processing and forming, and the diameters of the first cavity 111 and the second cavity 121 are the same to reduce the design complexity of the two cavity parts and facilitate the design and calculation of relevant parameters of the hydraulic circuit.
[0034] In some embodiments, the cylinder block 10 is provided with a first oil discharge hole 112, a first oil inlet hole 113 communicating with the first cavity 111, a second oil discharge hole 122, and a second oil inlet hole 123 communicating with the second cavity 121. The first cavity 111, the first oil discharge hole 112, the first oil inlet hole 113, and the pipelines, valves, etc. connected to the first oil discharge hole 112 and the first oil inlet hole 113 together constitute a hydraulic circuit suitable for driving the first piston rod 30. The second cavity 121, the second oil discharge hole 122, the second oil inlet hole 123, and the pipelines, valves, etc. connected to the second oil discharge hole 122 and the second oil inlet hole 123 together constitute another hydraulic circuit suitable for driving the second piston rod 50.
[0035] In some embodiments, the first oil discharge hole 112, the first oil inlet hole 113, the second oil discharge hole 122, and the second oil inlet hole 123 are sequentially arranged on the same side surface of the cylinder block 10 along the length direction of the cylinder block 10, so as to facilitate the centralized layout of hydraulic pipelines on the same side surface of the cylinder block 10.
[0036] In some embodiments, the aperture of the outer side of the first oil discharge hole 112, the first oil inlet hole 113, the second oil discharge hole 122, and the second oil inlet hole 123 is larger than that of the inner side, so as to adjust the flow rate of the oil fluid.
[0037] In some embodiments, the end surface of the second piston rod 50 close to the first piston rod 30 is adapted to abut against the first piston rod 30, and a first groove 511 extending from the edge opposite to the first oil inlet hole 113 towards the center is provided on this end surface. Similarly, in some embodiments, a second groove 124 extending from the second oil inlet hole 123 towards the center is provided on the surface of the second cavity 121 away from the first cavity 111. The first groove 511 and the second groove 124 are used to guide the oil fluid to flow towards the central position and push the first plug 32 and the second plug 52 from the central position. In a specific embodiment, the first groove 511 can be directly machined on the second rod body 51, or can be first machined on a separate component and then the component is installed on the second rod body 51.
[0038] The basic principles, main features, and advantages of the present application have been described above. Those skilled in the art of this industry should understand that the present application is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present application. Without departing from the spirit and scope of the present application, the present application will have various changes and improvements, and these changes and improvements all fall within the scope of the present application claimed. The scope of protection claimed by the present application is defined by the appended claims and their equivalents.
Claims
1. A double-section oil cylinder, characterized in that: It includes a cylinder body, a first piston rod and a second piston rod, wherein the interior of the cylinder body is provided with a first cavity and a second cavity, wherein the first cavity is provided at one end of the second cavity along the length direction of the cylinder body, the first piston rod is slidably provided in the first cavity, the second piston rod is slidably provided in the second cavity, and is suitable for sliding into the first cavity to push the first piston rod.
2. The double-section oil cylinder according to claim 1, characterized in that: The first piston rod includes a first rod body and a first plug body connected to each other, and the second piston rod includes a second rod body and a second plug body connected to each other, the first rod body is arranged on a side away from the second piston rod and separated from the inner wall of the first cavity, the first plug body is arranged on a side close to the second piston rod and slidably abuts against the inner wall of the first cavity, the second rod body is arranged on a side close to the first plug body and separated from the inner walls of the first cavity and the second cavity, and the second plug body is arranged on a side away from the second plug body and slidably abuts against the inner wall of the second cavity.
3. The double-section oil cylinder according to claim 2, characterized in that: A first sealing member is disposed at one end of the first cavity away from the second cavity, and the first sealing member is disposed around and between the first rod body and the cylinder body.
4. The double-section oil cylinder according to claim 1, characterized in that: A second sealing member is disposed in the cylinder body, and the second sealing member divides the cavity inside the cylinder body into the first cavity and the second cavity. A through hole is disposed on the second sealing member, and the second piston rod passes through the through hole.
5. The double-section oil cylinder according to claim 4, characterized in that: The cylinder body includes a first shell and a second shell which are spliced to each other, the first shell forms the first cavity, and the second shell forms the second cavity.
6. The double-section oil cylinder according to any one of claims 1 to 5, characterized in that: The cylinder body is provided with a first oil unloading hole and a first oil inlet hole communicated with the first cavity, and a second oil unloading hole and a second oil inlet hole communicated with the second cavity.
7. The double-section oil cylinder according to claim 6, characterized in that: The first oil unloading hole, the first oil inlet hole, the second oil unloading hole, and the second oil inlet hole are sequentially arranged on the same side of the cylinder body along the length direction of the cylinder body.
8. The double-section oil cylinder according to claim 6, characterized in that: The diameters of the first oil unloading hole, the first oil inlet hole, the second oil unloading hole, and the second oil inlet hole facing outward are larger than those facing inward.
9. The double-section oil cylinder according to claim 6, characterized in that: The end surface of the second piston rod close to the first piston rod is suitable for abutting against the first piston rod, and a first groove extending from an edge opposite to the first oil inlet hole to the center is arranged on the end surface.
10. The double-section oil cylinder according to claim 6, characterized in that: A second groove extending from the second oil inlet hole toward the center is provided on a side of the second cavity away from the first cavity.