Multi-oil-cylinder device capable of achieving sequential stretching and retracting and hydraulic system comprising multi-oil-cylinder device
By connecting the oil passages between multiple cylinders of the same specifications in the cylinder, sequential expansion and contraction are achieved, the problems of complex structure and high stroke requirements of existing multi-stage cylinders are solved, the cylinder structure is simplified and the stroke requirements of a single cylinder are reduced. .
Patent Information
- Application Number
- CN202420580431.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-22
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-03-22
AI Technical Summary
The existing multi-stage oil cylinder structures lead to complex structure and large volume when achieving boom expansion and contraction, and the expansion and contraction stroke requirements of a single oil cylinder are high.
By connecting the oil paths between multiple telescopic cylinders of the same specifications, multiple oil cylinders are extended or retracted in sequence, simplifying the oil cylinder structure and achieving telescopic function through oil circuit control.
The simplification of the oil cylinder structure and the reduction of stroke requirements are achieved, allowing the number of telescopic cylinders to be combined according to actual needs to meet different telescopic requirements.
Smart Images
Figure CN222254496U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of oil cylinders, in particular to a multi-oil cylinder device capable of realizing sequential extension and retraction and a hydraulic system comprising the same. Background Art
[0002] In some application scenarios where telescopic operation is required (such as cement pump trucks), the boom needs to be able to telescope to change its height. At present, the telescopic operation of the boom is often achieved by using a multi-stage cylinder. The structure of the multi-stage cylinder includes: an outer cylinder and N-stage inner cylinders. The N-stage inner cylinders include the first-stage inner cylinder to the N-stage inner cylinder that are nested step by step from the outside to the inside. When working, the N-stage inner cylinders extend or retract step by step, thereby realizing the telescopic function of the boom. However, this cylinder structure will cause the cylinder itself to have a more complex structure and a larger volume, and the telescopic stroke requirements of the multi-cylinder itself are higher. Utility Model Content
[0003] The technical problem to be solved by the utility model is that the existing solution of realizing boom extension and retraction with multi-stage oil cylinders leads to the technical problem that the structure of the oil cylinders themselves is relatively complicated.
[0004] To this end, the utility model provides a multi-cylinder device capable of achieving sequential telescopic movement and a hydraulic system including the same, which achieves stroke adjustment by combining multiple telescopic cylinders of the same specification, can simplify the structure of the cylinder itself, and improve versatility.
[0005] The technical solution adopted by the utility model to solve its technical problems is: a multi-cylinder device capable of realizing sequential telescopic movement, characterized in that it comprises: N telescopic cylinders, N≥2, the telescopic cylinders comprising: a cylinder body, a piston rod, a piston and a core tube, the piston rod is movably arranged in the cylinder body, the piston sleeve is arranged at one end of the piston rod, and the core tube is arranged in the piston rod; a first oil port and a second oil port are opened on the cylinder body, the inner cavity of the core tube forms a first oil channel, the cavity between the core tube and the piston rod forms a second oil channel, and the first oil port is communicated with the first oil channel; wherein the first oil channel of the N-1th telescopic cylinder is communicated with the first oil port of the Nth telescopic cylinder, and the second oil channel of the N-1th telescopic cylinder is communicated with the second oil port of the Nth telescopic cylinder.
[0006] Furthermore, a first through hole is formed at one end of the piston rod, a second through hole is formed on the piston, and the first through hole is communicated with the second through hole.
[0007] Furthermore, an annular groove is provided on the outer wall of the piston, and the annular groove is communicated with the second through hole.
[0008] Furthermore, a third through hole and a fourth through hole are formed on the rod head of the piston rod, the third through hole is communicated with the first oil passage, and the fourth through hole is communicated with the second oil passage.
[0009] Furthermore, an oil port seat is provided on the outer wall of the cylinder body, and the second oil port is opened on the oil port seat.
[0010] Furthermore, the oil port seat is provided with a first channel and a second channel, the first channel and the second channel are respectively communicated with the second oil port, and the first channel and the second channel are both communicated with the rod chamber of the cylinder body.
[0011] Furthermore, a fifth through hole is formed on the piston rod, a sixth through hole is formed on the piston, the sixth through hole is connected to the fifth through hole, the sixth through hole is connected to the rod chamber of the cylinder body, and a one-way valve is provided in the sixth through hole.
[0012] Furthermore, the cylinder body includes: a cylinder barrel and a cylinder bottom, the cylinder bottom is fixedly connected to one end of the cylinder barrel, and the first oil port is opened on the cylinder bottom.
[0013] Furthermore, a guide sleeve is provided at the other end of the cylinder, and the guide sleeve is sleeved on the piston rod.
[0014] The utility model also provides a hydraulic system, comprising a multi-cylinder device capable of realizing sequential extension and retraction.
[0015] The beneficial effect of the utility model is that the multi-cylinder device capable of realizing sequential telescopic extension and retraction of the utility model can realize sequential extension or retraction of multiple telescopic cylinders only through oil circuit control by improving the structure of the telescopic cylinder and connecting the oil circuits between multiple telescopic cylinders of the same specification. In this way, in actual application, it is only necessary to select the number of telescopic cylinders for combination according to the requirements of the actual telescopic stroke, which has a lower stroke requirement for a single telescopic cylinder and can also simplify the structure of the cylinder itself. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0017] Figure 1 It is a cross-sectional view of the telescopic oil cylinder of the utility model.
[0018] Figure 2 It is a structural schematic diagram of the utility model when the piston rod is fully extended.
[0019] Figure 3 It is a schematic diagram of the utility model when both the oil cylinders A and B are not extended.
[0020] Figure 4 It is a schematic diagram of the utility model when the oil cylinder A is fully extended and the oil cylinder B is not yet extended.
[0021] Figure 5It is a schematic diagram of the utility model when the oil cylinders A and B are fully extended.
[0022] In the figure: 1. cylinder body; 2. piston rod; 3. piston; 4. core tube; 5. first oil channel; 6. second oil channel; 7. one-way valve; 8. guide sleeve; 101. first oil port; 102. second oil port; 11. oil port seat; 12. rod chamber; 13. cylinder barrel; 14. cylinder bottom; 15. rodless chamber; 21. first through hole; 22. third through hole; 23. fourth through hole; 24. fifth through hole; 31. second through hole; 32. annular groove; 33. sixth through hole; 111. first channel; 112. second channel. DETAILED DESCRIPTION
[0023] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.
[0024] In the description of the present utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.
[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0026] like Figure 1 and Figure 2As shown, the multi-cylinder device capable of realizing sequential telescopic movement of the utility model comprises: N telescopic cylinders, N≥2, the telescopic cylinders comprising: a cylinder body 1, a piston rod 2, a piston 3 and a core tube 4, the piston rod 2 is movably arranged in the cylinder body 1, the piston 3 is sleeved on one end of the piston rod 2, and the core tube 4 is arranged in the piston rod 2; a first oil port 101 and a second oil port 102 are opened on the cylinder body 1, the inner cavity of the core tube 4 is formed as a first oil channel 5, the cavity between the core tube 4 and the piston rod 2 is formed as a second oil channel 6, and the first oil port 101 is communicated with the first oil channel 5; wherein, the first oil channel 5 of the N-1th telescopic cylinder is communicated with the first oil port 101 of the Nth telescopic cylinder, and the second oil channel 6 of the N-1th telescopic cylinder is communicated with the second oil port 102 of the Nth telescopic cylinder.
[0027] When extending, the first oil port 101 of the N-1 telescopic oil cylinder enters oil, and the hydraulic oil can push the piston 3 to move leftward, and the hydraulic oil can enter the first oil passage 5 and flow to the first oil port 101 of the N-1 telescopic oil cylinder, thereby pushing the piston 3 to move leftward, and the second oil passage 6 and the second oil port 102 are used for oil return. When retracting, the second oil passage 6 and the second oil port 102 are used for oil intake, and the first oil port 101 is used for oil return.
[0028] The utility model improves the structure of the telescopic oil cylinder and connects the oil paths between multiple telescopic oil cylinders of the same specification, so that multiple telescopic oil cylinders can be extended or retracted in sequence. In this way, in practical application, it is only necessary to select the number of telescopic oil cylinders to combine according to the actual telescopic stroke requirements, the stroke requirements for a single telescopic oil cylinder are relatively low, and the structure of the oil cylinder itself can also be simplified.
[0029] It should be noted that the cylinder body 1 includes: a cylinder barrel 13 and a cylinder bottom 14, the cylinder bottom 14 is fixedly connected to one end of the cylinder barrel 13, and the first oil port 101 is opened on the cylinder bottom 14. A guide sleeve 8 is provided at the other end of the cylinder barrel 13, and the guide sleeve 8 is sleeved on the piston rod 2. The piston 3 divides the space inside the cylinder barrel 13 into a rod chamber 12 and a rodless chamber 15, the rodless chamber 15 is connected to the first oil port 101, and the rod chamber 12 is connected to the second oil port 102. When the piston rod 2 moves to the left, the hydraulic oil in the rod chamber 12 is returned through the second oil port 102.
[0030] It should be noted that, in order to improve the control accuracy of the telescopic stroke of the multi-cylinder device, the utility model is configured so that the piston rod 2 of the N-th telescopic cylinder will not be extended until the piston rod 2 of the N-1th telescopic cylinder is fully extended. Since the piston rod 2 of the N-th telescopic cylinder needs to return oil through the second oil port 102 when it is extended, and the second oil port 102 of the N-th telescopic cylinder is connected to the second oil channel 6 of the N-1th telescopic cylinder. In other words, the return oil of the N-th telescopic cylinder must pass through the second oil channel 6 of the N-1th telescopic cylinder, and the hydraulic oil in the second oil channel 6 needs to flow to the second oil port 102. In order to achieve this purpose, specifically, a first through hole 21 is provided at one end of the piston rod 2, and a second through hole 31 is provided on the piston 3, and the first through hole 21 and the second through hole 31 are connected. An annular groove 32 is provided on the outer wall of the piston 3, and the annular groove 32 is connected to the second through hole 31. It is understandable that the outer diameter of the piston 3 matches the inner diameter of the cylinder body 1, so that the rod chamber 12 and the rodless chamber 15 are not connected. Through the design of the first through hole 21, the second through hole 31 and the annular groove 32, when the piston rod 2 of the N-1 telescopic cylinder is fully extended, the annular groove 32 will be connected to the second oil port 102, and at this time, the hydraulic oil in the second oil channel 6 can flow to the second oil port 102 through the first through hole 21, the second through hole 31, and the annular groove 32 for oil return. At this time, the piston rod 2 of the Nth telescopic cylinder can be extended.
[0031] Specifically, a third through hole 22 and a fourth through hole 23 are provided on the rod head of the piston rod 2, the third through hole 22 is connected to the first oil passage 5, and the fourth through hole 23 is connected to the second oil passage 6. An oil port seat 11 is provided on the outer wall of the cylinder body 1, and the second oil port 102 is provided on the oil port seat 11. A first channel 111 and a second channel 112 are provided on the oil port seat 11, and the first channel 111 and the second channel 112 are respectively connected to the second oil port 102, and the first channel 111 and the second channel 112 are both connected to the rod chamber 12 of the cylinder body 1. A fifth through hole 24 is provided on the piston rod 2, and a sixth through hole 33 is provided on the piston 3, and the sixth through hole 33 is connected to the fifth through hole 24, and the sixth through hole 33 is connected to the rod chamber 12 of the cylinder body 1, and a one-way valve 7 is provided in the sixth through hole 33. When the piston rod 2 is fully extended, the annular groove 32 is aligned with the second channel 112, and the sixth through hole 33 is aligned with the first channel 111. Due to the unidirectional conductivity of the one-way valve 7 , the hydraulic oil can only flow from the second oil port 102 to the second oil channel 6 .
[0032] When retracting, the second oil port 102 of the N-1 telescopic oil cylinder enters oil, and the hydraulic oil passes through the first channel 111 and the one-way valve 7 into the second oil channel 6, and then passes through the second oil channel 6 into the second oil port 102 of the N-th telescopic oil cylinder. Since the hydraulic oil in the second oil channel 6 of the N-th telescopic oil cylinder can no longer flow to the next telescopic oil cylinder, the pressure of the rod chamber 12 of the N-th telescopic oil cylinder will increase, thereby pushing the piston 3 to move to the right. When the piston rod 2 of the N-th telescopic oil cylinder is fully retracted, the pressure of the rod chamber 12 of the N-1 telescopic oil cylinder will increase, thereby pushing the piston 3 to move to the right. In other words, multiple telescopic oil cylinders are also retracted in sequence.
[0033] like Figure 3 to Figure 4 As shown, the following takes two telescopic cylinders as an example to specifically explain the working process of extending and retracting. The two telescopic cylinders are respectively recorded as cylinder A and cylinder B, cylinder A is the front cylinder, and cylinder B is the back cylinder.
[0034] When extending, oil enters the first oil port 101 of cylinder A, pushing the piston 3 to move to the left. When the piston rod 2 is fully extended, the second oil channel 6 is connected to the second oil port 102. At this time, the hydraulic oil in cylinder A enters the first oil port 101 of cylinder B through the first channel 5, and can push the piston 3 of cylinder B to move to the left. The hydraulic oil in the rod chamber 12 of cylinder B can return oil through the second oil port 102 of cylinder B and the second oil channel 6 of cylinder A, and the piston rod 2 of cylinder B is fully extended.
[0035] When retracting, the second oil port 102 of the oil cylinder A enters the oil, and the hydraulic oil passes through the one-way valve 7 of the oil cylinder A, the second oil channel 6, and the second oil port 102 of the oil cylinder B into the rod chamber 12 of the oil cylinder B. The pressure of the rod chamber 12 of the oil cylinder B increases, pushing the piston 3 of the oil cylinder B to move rightward until the piston rod 2 of the oil cylinder B is fully retracted. Then, the pressure of the rod chamber 12 of the oil cylinder A will increase, thereby pushing the piston 3 of the oil cylinder A to move rightward, and the piston rod 2 of the oil cylinder A is fully retracted.
[0036] The utility model also provides a hydraulic system, comprising a multi-cylinder device capable of realizing sequential extension and retraction.
[0037] In summary, the utility model of the multi-cylinder device capable of realizing sequential telescopic extension and retraction improves the structure of the telescopic cylinder and connects the oil paths between multiple telescopic cylinders of the same specification, so that multiple telescopic cylinders can be extended or retracted in sequence. In this way, in actual application, it is only necessary to select the number of telescopic cylinders to combine according to the requirements of the actual telescopic stroke, which has a lower stroke requirement for a single telescopic cylinder and can also simplify the structure of the cylinder itself.
[0038] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without departing from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.
Claims
1. A multi-cylinder device capable of achieving sequential extension and retraction, characterized in that: include: N telescopic oil cylinders, N≥2, the telescopic oil cylinders comprising: a cylinder body (1), a piston rod (2), a piston (3) and a core tube (4), the piston rod (2) being movably arranged in the cylinder body (1), the piston (3) being sleeved on one end of the piston rod (2), and the core tube (4) being arranged in the piston rod (2); The cylinder body (1) is provided with a first oil port (101) and a second oil port (102); the inner cavity of the core tube (4) forms a first oil passage (5); the cavity between the core tube (4) and the piston rod (2) forms a second oil passage (6); the first oil port (101) is in communication with the first oil passage (5); The first oil passage (5) of the N-1th telescopic oil cylinder is connected to the first oil port (101) of the Nth telescopic oil cylinder, and the second oil passage (6) of the N-1th telescopic oil cylinder is connected to the second oil port (102) of the Nth telescopic oil cylinder.
2. The multi-cylinder device capable of sequential extension and retraction as claimed in claim 1, characterized in that: A first through hole (21) is formed at one end of the piston rod (2), a second through hole (31) is formed on the piston (3), and the first through hole (21) and the second through hole (31) are connected.
3. The multi-cylinder device capable of sequential extension and retraction as claimed in claim 2, characterized in that: An annular groove (32) is provided on the outer wall of the piston (3), and the annular groove (32) is connected to the second through hole (31).
4. The multi-cylinder device capable of sequential extension and retraction as claimed in claim 1, characterized in that: A third through hole (22) and a fourth through hole (23) are provided on the rod head of the piston rod (2); the third through hole (22) is connected to the first oil passage (5), and the fourth through hole (23) is connected to the second oil passage (6).
5. The multi-cylinder device capable of sequential extension and retraction as claimed in claim 1, characterized in that: An oil port seat (11) is provided on the outer wall of the cylinder body (1), and the second oil port (102) is opened on the oil port seat (11).
6. The multi-cylinder device capable of sequential extension and retraction as claimed in claim 5, characterized in that: The oil port seat (11) is provided with a first channel (111) and a second channel (112); the first channel (111) and the second channel (112) are respectively connected to the second oil port (102); and the first channel (111) and the second channel (112) are both connected to the rod chamber (12) of the cylinder body (1).
7. The multi-cylinder device capable of sequential extension and retraction as claimed in claim 1, characterized in that: The piston rod (2) is provided with a fifth through hole (24), the piston (3) is provided with a sixth through hole (33), the sixth through hole (33) is connected to the fifth through hole (24), the sixth through hole (33) is connected to the rod chamber (12) of the cylinder body (1), and a one-way valve (7) is provided in the sixth through hole (33).
8. The multi-cylinder device capable of sequential extension and retraction as claimed in claim 1, characterized in that: The cylinder body (1) comprises: a cylinder barrel (13) and a cylinder bottom (14); the cylinder bottom (14) is fixedly connected to one end of the cylinder barrel (13); and the first oil port (101) is opened on the cylinder bottom (14).
9. The multi-cylinder device capable of sequential extension and retraction as claimed in claim 8, characterized in that: The other end of the cylinder barrel (13) is provided with a guide sleeve (8), and the guide sleeve (8) is sleeved on the piston rod (2).
10. A hydraulic system, characterized in that: It comprises a multi-cylinder device capable of achieving sequential extension and retraction as described in any one of claims 1 to 9.