Multi-oil-cylinder synchronous guide mechanism and control method thereof
By designing a multi-cylinder synchronous guide mechanism, the combination of pressure reducing valve, throttle valve and three-position four-way reversing valve, combined with the precise control of servo motor and screw, the synchronization problem of multiple oil cylinders in construction machinery is solved, and the synchronization problem of multiple oil cylinders in construction machinery is achieved. The unified initial position and synchronous movement of the oil cylinder.
Patent Information
- Application Number
- CN202411475295.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-22
- Publication Date
- 2025-01-10
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Multiple oil cylinders are prone to synchronization problems in construction machinery, resulting in the out-of-synchronization of the oil cylinders. For example, the movement speed of the cylinder piston is inconsistent, the friction resistance is different, and the length error of the connecting pipe fittings is used simultaneously and the use of new and old oil cylinders during maintenance, resulting in complex inconsistency problems.
A multi-cylinder synchronous guide mechanism is designed to connect the pressure reducing valve and the throttle valve through the oil inlet and outlet ports at the upper end of each cylinder, and is uniformly controlled by a three-position four-way reversing valve, combining a one-way valve and an electromagnetic switch valve to ensure all cylinders synchronous motion. The throttle valve is equipped with a servo motor and a screw, which accurately controls the movement of the valve core for flow control.
The initial position of all cylinders is unified and the extension speed is consistent, ensuring synchronous movement, and solving the problem of the cylinder being out of synchronization.
Smart Images
Figure CN119288937A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of oil cylinders, and in particular to a multi-oil cylinder synchronous guiding mechanism and a control method thereof. Background Art
[0002] Hydraulic cylinders are widely used in construction machinery and lifting machinery, and they convert hydraulic energy into mechanical energy. In many cases, a single cylinder cannot meet actual needs, and dual or multi-cylinder drives are required. For some precision equipment, there will be problems with the synchronization of multiple cylinders. For example, cylinder asynchrony can easily lead to torsional loads on the supported workpiece; the bending angles on both sides of the bending machine are different, and the two sides are not synchronized after pressurization, and other complex problems.
[0003] The main reasons for the cylinders not being synchronized are: 1. The external load resistance of multiple cylinders is not the same. The greater the resistance the cylinder encounters, the slower the speed of the cylinder piston will move; 2. The friction resistance between each cylinder piston and its inner wall is different; 3. The length of the oil inlet and outlet pipes connecting the oil cylinder has errors and cannot be guaranteed to be completely uniform, and the resistance along the pipe fittings is different; 4. When repairing or replacing one of the cylinders, the new and old cylinders should be used at the same time. Summary of the invention
[0004] The object of the present invention is to provide a multi-cylinder synchronous guiding mechanism to solve the problem of asynchronism in the movement of multiple cylinders mentioned in the above background technology.
[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a multi-cylinder synchronous guiding mechanism and a control method thereof, comprising a plurality of cylinders, wherein the oil inlet and outlet ports at the upper end of each cylinder are connected in sequence with a pressure reducing valve and a throttle valve through pipelines, and all branches are merged into an interface of a three-position four-way reversing valve, and each group of pressure reducing valves and throttle valves is connected in parallel with a group of mutually serially connected one-way valves and electromagnetic switch valves, and the oil inlet and outlet ports at the lower ends of all cylinders are merged into another interface on the same side of the three-position four-way reversing valve, and an interface on the other side of the three-position four-way reversing valve is connected in sequence with an oil pump and an oil tank, and the last interface of the three-position four-way reversing valve is connected to the oil tank.
[0006] Preferably, the throttle valve includes a valve body, the inner cavity of the valve body is penetrated to one end to form an oil inlet and an oil outlet, the inner cavity of the valve body is penetrated to the other end to form a through groove, and a servo motor seat is fixedly installed on the top of the end, a servo motor is installed on the servo motor seat, a screw rod is fixed at the driving end of the servo motor, the end of the screw rod is threadedly sleeved with a push plate, both ends of the push plate are slidably inserted in the sliding groove on the inner wall of the through groove, and a valve core is fixed at the bottom of the push plate, and the valve core can block the oil outlet.
[0007] Compared with the prior art, the present invention has the following beneficial effects: The multi-cylinder synchronous guiding mechanism of the present invention controls the oil output of the upper oil inlet and outlet of the hydraulic cylinder through simple hydraulic elements, thereby achieving the uniform initial position of all cylinders and the same extension speed, thereby achieving synchronous movement. BRIEF DESCRIPTION OF THE DRAWINGS
[0008] Figure 1 It is the overall hydraulic principle diagram of the present invention; Figure 2 It is a cross-sectional view of the throttle valve in the present invention.
[0009] In the figure: 1. Oil cylinder; 2. Pressure reducing valve; 3. Throttle valve; 31. Valve body; 32. Oil inlet; 33. Oil outlet; 34. Servo motor seat; 35. Servo motor; 36. Push plate; 37. Valve core; 38. Slide; 4. Check valve; 5. Solenoid switch valve; 7. Three-position four-way reversing valve; 8. Oil tank; 9. Oil pump. DETAILED DESCRIPTION
[0010] See also Figure 1-2 A multi-cylinder synchronous guiding mechanism comprises a plurality of cylinders 1, the oil inlet and outlet at the upper end of each cylinder 1 are connected in sequence with a pressure reducing valve 2 and a throttle valve 3 through a pipeline, and a branch is connected to an interface of a three-position four-way reversing valve 7, a group of mutually serially connected one-way valves 4 and electromagnetic switch valves 5 are connected in parallel on each group of pressure reducing valves 2 and throttle valves 3, the oil inlet and outlet at the lower end of the cylinder 1 are connected to another interface on the same side of the three-position four-way reversing valve 7, an interface on the other side of the three-position four-way reversing valve 7 is connected to an oil pump 9 and an oil tank 8 in sequence, and the last interface of the three-position four-way reversing valve 7 is connected to the oil tank 8.
[0011] The working principle of the above-mentioned connecting pipeline is as follows: first, the throttle valve 3 is closed, the three-position four-way reversing valve 7 is in the left state, and the oil pump 9 draws the oil in the oil tank 8 into the oil cylinder 1 through the electromagnetic switch valve 5 and the one-way valve 4. The telescopic ends of all oil cylinders 1 return to the lowest end, which is equivalent to the oil cylinder 1 returning to the unified starting position. Then the three-position four-way reversing valve 7 is switched to the rightmost state, the oil inlet and outlet directions are reversed, the electromagnetic switch valve 5 is closed, and the hydraulic oil enters the bottom of the oil cylinder 1 to lift the oil cylinder 1. The oil in the top of the oil cylinder 1 enters the throttle valve 3 from the pressure reducing valve 2 and flows into the oil tank 8 through the three-position four-way reversing valve 7. Since the outflow speed of the hydraulic oil 1 in the oil cylinder 1 is controlled, the extension speed of all oil cylinders 1 is consistent, realizing synchronous movement. The oil cylinder 1 needs to be reset and resynchronized after each extension.
[0012] The throttle valve 3 includes a valve body 31. The inner cavity of the valve body 31 is connected to one end to form an oil inlet 32 and an oil outlet 33. The inner cavity of the valve body 31 is connected to the other end to form a through groove, and a servo motor seat 34 is fixedly installed on the top of the end. A servo motor 35 is installed on the servo motor seat 34. A screw rod is fixed to the driving end of the servo motor 35. The end of the screw rod is threadedly sleeved with a push plate 36. Both ends of the push plate 36 are slidably inserted in the slide groove 38 on the inner wall of the through groove. A valve core 37 is fixed to the bottom of the push plate 36. The valve core 37 can block the oil outlet 33. The servo motor 35 accurately controls the rotation angle and cooperates with the screw rod to accurately control the movement of the valve core 37, thereby accurately throttling the flow of the throttle valve 3.
Claims
1. A multi-cylinder synchronous guiding mechanism, comprising a plurality of cylinders (1), characterized in that: The oil inlet and outlet ports at the upper end of each oil cylinder (1) are connected in sequence to a pressure reducing valve (2) and a throttle valve (3) through pipelines, and all branches are merged into an interface of a three-position four-way reversing valve (7). A group of mutually serially connected one-way valves (4) and electromagnetic switch valves (5) are connected in parallel to each group of pressure reducing valves (2) and throttle valves (3). The oil inlet and outlet ports at the lower ends of all oil cylinders (1) are merged into another interface on the same side of the three-position four-way reversing valve (7). An interface on the other side of the three-position four-way reversing valve (7) is connected to an oil pump (9) and an oil tank (8) in sequence, and the last interface of the three-position four-way reversing valve (7) is connected to the oil tank (8).
2. The multi-cylinder synchronous guide mechanism according to claim 1, characterized in that: The throttle valve (3) comprises a valve body (31). The inner cavity of the valve body (31) is connected to one end to form an oil inlet (32) and an oil outlet (33). The inner cavity of the valve body (31) is connected to the other end to form a through groove. A servo motor seat (34) is fixedly mounted on the top of the end. A servo motor (35) is mounted on the servo motor seat (34). A screw rod is fixed to the driving end of the servo motor (35). The end of the screw rod is threadedly sleeved with a push plate (36). Both ends of the push plate (36) are slidably inserted into a slide groove (38) on the inner wall of the through groove. A valve core (37) is fixed to the bottom of the push plate (36). The valve core (37) can block the oil outlet (33).
3. The control method of the multi-cylinder synchronous guide mechanism according to claim 1 or 2, characterized in that: The following steps are also included: S1: First, the throttle valve 3 is closed, the three-position four-way reversing valve 7 is in the left state, and the oil pump 9 pumps the oil in the oil tank 8 into the oil cylinder 1 through the electromagnetic switch valve 5 and the one-way valve 4, and all the telescopic ends of the oil cylinder 1 return to the lowest end, which is equivalent to the oil cylinder 1 returning to the unified starting position; S2: The three-position four-way reversing valve 7 is switched to the rightmost state, the oil inlet and outlet directions are reversed, the electromagnetic switch valve 5 is closed, the hydraulic oil enters the bottom of the oil cylinder 1 to lift the oil cylinder 1, and the oil in the top of the oil cylinder 1 enters the throttle valve 3 from the pressure reducing valve 2 and flows into the oil tank 8 through the three-position four-way reversing valve 7. Since the outflow speed of the hydraulic oil 1 in the oil cylinder 1 is controlled, the extension speed of all the oil cylinders 1 is consistent, realizing synchronous movement; S3: Cylinder 1 needs to be reset and resynchronized each time it is extended.