Hydraulic device for achieving multi-cylinder synchronization and precise positioning
By combining components such as safety valves, solenoid directional valves, one-way throttle valves, and synchronous motors, along with the cooperation of solenoid ball valves and displacement sensors, the problem of insufficient synchronous positioning accuracy of multi-cylinder systems has been solved, achieving a high-precision synchronous positioning effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANHUA CONSTRUCTION MATERIALS (CHINA) CO LTD
- Filing Date
- 2025-09-26
- Publication Date
- 2026-07-21
AI Technical Summary
In existing technologies, the synchronous positioning accuracy of multi-cylinder systems is insufficient, especially when stopping at any position, the synchronous positioning error is large and it is difficult to achieve 100% accuracy.
It adopts a combination of components such as safety valve, solenoid directional valve, one-way throttle valve, synchronous motor, solenoid ball valve, hydraulic lock, and position sensor. Through the cooperation of solenoid ball valve and displacement sensor, and by using different pressure step settings, it can realize the synchronous extension and retraction and precise positioning of multiple oil cylinders.
It achieves high-precision positioning of multiple hydraulic cylinders during synchronous movement, reduces cumulative errors, and ensures the synchronous positioning accuracy of multiple hydraulic cylinders at any position.
Smart Images
Figure CN224533119U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of pipe pile production, and more particularly to the field of pipe mold lifting, specifically referring to a hydraulic device that enables simultaneous and precise positioning of multiple oil cylinders. Background Technology
[0002] In the pipe pile industry, the existing method for lifting pipe molds is to use the diversion effect of a synchronous motor to make multiple hydraulic cylinders extend and retract synchronously. Although this method can achieve the problem of synchronous lifting to a certain extent, the problem of synchronous positioning when multiple cylinders stop at the same arbitrary position has always been an unsolved problem. The synchronous positioning accuracy depends entirely on the manufacturing accuracy of the synchronous motor, and the cylinder synchronization of the synchronous motor alone can never reach 100%. Utility Model Content
[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a hydraulic device that achieves synchronous and precise positioning of multiple cylinders with small positioning error, high positioning accuracy, and wide applicability.
[0004] To achieve the above objectives, the hydraulic device of this utility model for achieving synchronous and precise positioning of multiple oil cylinders is as follows: This hydraulic device, which enables simultaneous and precise positioning of multiple cylinders, is characterized by comprising a safety valve, a solenoid directional valve, a one-way throttle valve, a synchronous motor, a first solenoid ball valve, a second solenoid ball valve, a first hydraulic lock, a second hydraulic lock, a first cylinder, and a second cylinder. The synchronous motor has two passages, one with an outlet at port A1 and the other with an outlet at port A2. The safety valve is connected to the solenoid directional valve, the P port of which is connected to an external PP oil circuit, and the A port of which is connected to the left side of the one-way throttle valve. The circuits are connected as follows: the inlets of both passages of the synchronous motor are connected to a one-way throttle valve; the right position of the first solenoid ball valve is connected to port A1 of the synchronous motor; the left position of the first hydraulic lock is connected to the right position of the first solenoid ball valve; and the first hydraulic cylinder is connected to the first hydraulic lock. The left position of the second solenoid ball valve is connected to port A2 of the synchronous motor; the left position of the second hydraulic lock is connected to the left position of the second solenoid ball valve; and the second hydraulic cylinder is connected to the second hydraulic lock. The right positions of both the first and second hydraulic locks are connected to the right position of the one-way throttle valve.
[0005] Preferably, the synchronous motor includes a left motor, a first replenishing valve, and a first relief valve. The first port of the left motor is connected to a one-way throttle valve, the second port of the left motor is connected to the A1 port of the synchronous motor, the second port of the left motor is also connected to the second port of the first replenishing valve, the first port of the first replenishing valve is connected to the return oil pipe through the oil tank, the first port of the first relief valve is connected to the second port of the left motor, and the second port of the first relief valve is connected to the return oil pipe through the oil tank.
[0006] Preferably, the synchronous motor further includes a right motor, a second replenishing valve, and a second overflow valve. The first port of the right motor is connected to a one-way throttle valve, the second port of the right motor is connected to the A2 port of the synchronous motor, the second port of the right motor is also connected to the second port of the second replenishing valve, the first port of the second replenishing valve is connected to the return oil pipe through the oil tank, the first port of the second overflow valve is connected to the second port of the right motor, and the second port of the second overflow valve is connected to the return oil pipe through the oil tank.
[0007] Preferably, the device further includes a first position sensor and a second position sensor, wherein the first position sensor is connected to the first hydraulic cylinder and the second position sensor is connected to the second hydraulic cylinder.
[0008] Preferably, the set pressure of the safety valve is higher than the set pressure of the first relief valve and the second relief valve, and the set pressure of the first relief valve and the second relief valve are the same.
[0009] Preferably, if the first hydraulic cylinder reaches the set position before the second hydraulic cylinder, the electromagnet of the first solenoid ball valve is energized and reversed, cutting off the oil passage to the rodless chamber of the first hydraulic cylinder. After the second hydraulic cylinder extends to the set position, the solenoid reversing valve is de-energized, the valve core returns to the neutral position, and the first and second hydraulic cylinders rely on each other.
[0010] Preferably, if the second cylinder reaches the set position before the first cylinder, the electromagnet of the second solenoid ball valve is energized and reversed, cutting off the oil passage to the rodless chamber of the second cylinder. After the first cylinder extends to the set position, the solenoid reversing valve is de-energized, the valve core returns to the neutral position, and the first and second cylinders rely on each other.
[0011] The hydraulic device of this invention, which enables simultaneous and precise positioning of multiple cylinders, not only allows multiple cylinders to extend and retract synchronously, but also enables higher precision synchronous positioning of multiple cylinders through the cooperation of electromagnetic ball valve and displacement sensor, and the different pressure step settings of safety valve and first relief valve. Attached Figure Description
[0012] Figure 1This is a schematic diagram of the hydraulic device of this utility model that enables simultaneous and precise positioning of multiple oil cylinders.
[0013] Figure label: 1. Safety valve 2 Electromagnetic commutation 3. One-way throttle valve 4 Synchronous Motors 5. First Solenoid Ball Valve 6 Second Solenoid Ball Valve 7 First hydraulic lock 8 Second hydraulic lock 9 First oil cylinder 10 Second oil cylinder 11 First position sensor 12 Second position sensor 13 Left Motor 14 Right Motor 15 First oil replenishment valve 16 Second oil replenishment valve 17 First relief valve 18 Second Overflow Detailed Implementation
[0014] To more clearly describe the technical content of this utility model, the following description is provided in conjunction with specific embodiments.
[0015] This utility model discloses a hydraulic device for achieving synchronous and precise positioning of multiple cylinders, comprising a safety valve 1, a solenoid directional valve 2, a one-way throttle valve 3, a synchronous motor 4, a first solenoid ball valve 5, a second solenoid ball valve 6, a first hydraulic lock 7, a second hydraulic lock 8, a first cylinder 9, and a second cylinder 10. The synchronous motor 4 includes two passages, one with an outlet at port A1 and the other with an outlet at port A2. The safety valve 1 is connected to the solenoid directional valve 2, the P port of the solenoid directional valve 2 is connected to an external PP oil circuit, and the A port of the solenoid directional valve 2 is connected to the left oil circuit of the one-way throttle valve 3. The inlets of both passages of the synchronous motor 4 are connected to the one-way throttle valve 3. The right position of the first solenoid ball valve 5 is connected to the A1 port of the synchronous motor 4. The left position of the first hydraulic lock 7 is connected to the right position of the first solenoid ball valve 5. The first cylinder 9 is connected to the first hydraulic lock 7. The left position of the second solenoid ball valve 6 is connected to the A2 port of the synchronous motor 4. The left position of the second hydraulic lock 8 is connected to the left position of the second solenoid ball valve 6. The second cylinder 10 is connected to the second hydraulic lock 8. The right positions of the first hydraulic lock 7 and the second hydraulic lock 8 are both connected to the right position of the one-way throttle valve 3.
[0016] In a preferred embodiment of this utility model, the synchronous motor 4 includes a left motor 13, a first oil replenishing valve 15, and a first overflow valve 17. The first port of the left motor 13 is connected to the one-way throttle valve 3, the second port of the left motor 13 is connected to the A1 port of the synchronous motor 4, the second port of the left motor 13 is also connected to the second port of the first oil replenishing valve 15, the first port of the first oil replenishing valve 15 is connected to the return oil pipe of the straight-through oil tank, the first port of the first overflow valve 17 is connected to the second port of the left motor 13, and the second port of the first overflow valve 17 is connected to the return oil pipe of the straight-through oil tank.
[0017] In a preferred embodiment of this utility model, the synchronous motor 4 further includes a right motor 14, a second oil replenishing valve 16, and a second overflow valve 18. The first port of the right motor 14 is connected to the one-way throttle valve 3, the second port of the right motor 14 is connected to the A2 port of the synchronous motor 4, the second port of the right motor 14 is also connected to the second port of the second oil replenishing valve 16, the first port of the second oil replenishing valve 16 is connected to the return oil pipe of the straight-through oil tank, the first port of the second overflow valve 18 is connected to the second port of the right motor 14, and the second port of the second overflow valve 18 is connected to the return oil pipe of the straight-through oil tank.
[0018] In a preferred embodiment of the present invention, the device further includes a first position sensor 11 and a second position sensor 12, wherein the first position sensor 11 is connected to the first hydraulic cylinder 9 and the second position sensor 12 is connected to the second hydraulic cylinder 10.
[0019] In a preferred embodiment of the present invention, the set pressure of the safety valve 1 is higher than the set pressure of the first overflow valve 17 and the second overflow valve 18, and the set pressure of the first overflow valve 17 and the second overflow valve 18 are the same.
[0020] In a preferred embodiment of this utility model, if the first oil cylinder 9 reaches the set position before the second oil cylinder 10, the electromagnet of the first electromagnetic ball valve 5 is energized and reversed, cutting off the oil passage to the rodless chamber of the first oil cylinder 9. After the second oil cylinder 10 extends to the set position, the electromagnetic reversing valve 2 is de-energized, the valve core returns to the neutral position, and the first oil cylinder 9 and the second oil cylinder 10 rely on each other.
[0021] In a preferred embodiment of this utility model, if the second oil cylinder 10 reaches the set position before the first oil cylinder 9, the electromagnet of the second electromagnetic ball valve 6 is energized and reversed, cutting off the oil passage to the rodless chamber of the second oil cylinder 10. After the first oil cylinder 9 extends to the set position, the electromagnetic reversing valve 2 is de-energized, the valve core returns to the neutral position, and the first oil cylinder 9 and the second oil cylinder 10 rely on each other.
[0022] This utility model belongs to the pipe pile manufacturing industry and is specifically applied in the production process of prestressed pipe pile factories. It utilizes multiple hydraulic cylinders to lift the pipe mold to a certain height, facilitating the next process operation.
[0023] This invention provides a hydraulic solution that allows multiple hydraulic cylinders to synchronously lift a cover mold to a certain height with very high synchronous positioning accuracy. Through the cooperation of an electromagnetic ball valve, a flow divider motor, a position sensor, a safety valve 1, and a first relief valve 17 and a second relief valve 18, this invention enables two hydraulic cylinders not only to extend and retract synchronously but also to achieve precise positioning of the two cylinders at any position, something impossible with a conventional synchronous motor alone.
[0024] The second port of the first replenishing valve 15 is connected to the second port of the left motor 13, and the first port of the first replenishing valve 15 is connected to the return oil pipe that runs directly through the oil tank. The second port of the second replenishing valve 16 is connected to the second port of the right motor 14, and the first port of the second replenishing valve 16 is connected to the return oil pipe that runs directly through the oil tank.
[0025] The function of the first oil replenishing valve 15 and the second oil replenishing valve 16 is that when there is a forced mechanical connection between the first oil cylinder 9 and the second oil cylinder 10, if the speeds of the two oil cylinders are different, the oil cylinder with the slower movement speed can draw oil from the pipe connected to the oil tank through the oil replenishing valve to avoid negative pressure in the oil cylinder.
[0026] The first port of the first overflow valve 17 is connected to the second port of the left motor 13, and the second port of the first overflow valve 17 is connected to the return oil pipe through the oil tank. The first port of the second overflow valve 18 is connected to the second port of the right motor 14, and the second port of the second overflow valve 18 is connected to the return oil pipe through the oil tank.
[0027] The function of the first relief valve 17 and the second relief valve 18 is as follows: When a certain oil cylinder reaches the target position first, and the other oil cylinders have not reached the target position, the excess oil of the oil cylinder that reaches the target position first is discharged back to the oil tank through the relief valve.
[0028] In a specific embodiment of this utility model, the operation process is as follows: S1: The process of two oil cylinders rising synchronously.
[0029] When the left electromagnet of the solenoid directional valve 2 is energized, high-pressure oil from the PP oil circuit enters the left oil circuit of the one-way throttle valve 3 through the P and A ports of the solenoid directional valve 2, and then enters the synchronous motor 4. Within the synchronous motor 4, the high-pressure oil is divided into two paths: one path flows from the left motor 13 to the A1 port of the synchronous motor 4, then flows from the right position of the first solenoid ball valve 5 to the left position of the first hydraulic lock 7, and then injects into the rodless chamber of the first cylinder 9; the other path flows from the right motor 14 to the A2 port of the synchronous motor 4, then flows from the left position of the second solenoid ball valve 6 to the left position of the second hydraulic lock 8, and then injects into the rodless chamber of the second cylinder 10. The return oil from the upper chamber of the cylinder merges through the right positions of the first hydraulic lock 7 and the second hydraulic lock 8, enters the right position of the one-way throttle valve 3, and then flows back to the oil tank through the B and T ports of the solenoid directional valve 2.
[0030] The two hydraulic cylinders extend synchronously through the diversion action of the synchronous motor 4.
[0031] S2: Precise adjustment process for positioning the two hydraulic cylinders.
[0032] Due to the inherent error of the synchronous motor 4, a positioning error of about 3% will accumulate when the two oil cylinders rise synchronously. This error will cause a large cumulative error between the two oil cylinders when the oil cylinder stroke is long, and the gripper cannot grasp the running wheel at the same time. In order to solve this problem, the first solenoid ball valve 5, the second solenoid ball 6 and the synchronous motor 4 can work together to further reduce the cumulative error and achieve high-precision positioning of the two oil cylinders.
[0033] Implementation process: During the synchronous extension of the two cylinders, the first position sensor 11 and the second position sensor 12 detect the actual positions of the first cylinder 9 and the second cylinder 10, respectively. If the first cylinder 9 reaches the set position first, the electromagnet of the first solenoid ball valve 5 is energized and reversed, cutting off the oil passage to the rodless chamber of the first cylinder 9, locking the first cylinder 9 in place. Simultaneously, the oil passage to the rodless chamber of the second cylinder 10 remains unaffected, and the second cylinder 10 continues to extend slowly. A prerequisite for this operation is that the set pressure of the safety valve 1 must be higher than the set pressures of the first relief valve 17 and the second relief valve 18. The set pressures of the first relief valve 17 and the second relief valve 18 must be the same; this condition is crucial. After the second cylinder 10 extends to the set position, the solenoid reversing valve 2 is de-energized, the valve core returns to the neutral position, and the two cylinders lean against each other.
[0034] The first hydraulic lock 7 and the second hydraulic lock 8 lock the oil cylinder in a fixed position.
[0035] If the second cylinder 10 reaches the set position first, the principle is the same as above.
[0036] By utilizing this hydraulic principle and operating procedure, the synchronization error of the two cylinders can be greatly improved, enabling the two cylinders to accurately adjust and synchronize their positioning error.
[0037] The on / off coordination of the solenoid ball valve enables multiple hydraulic cylinders to maintain precise synchronous positioning while extending and retracting synchronously.
[0038] This invention utilizes multiple sets of electromagnetic ball valves to switch each oil outlet of the synchronous motor, allowing excess hydraulic oil to flow back to the oil tank through the first relief valve 17 or the first relief valve 18, thereby achieving synchronous positioning accuracy.
[0039] For the specific implementation scheme of this embodiment, please refer to the relevant descriptions in the above embodiments, which will not be repeated here.
[0040] It is understood that the same or similar parts in the above embodiments can be referred to each other, and the contents not described in detail in some embodiments can be referred to the same or similar contents in other embodiments.
[0041] It should be noted that in the description of this utility model, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means at least two.
[0042] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0043] The hydraulic device of this invention, which enables simultaneous and precise positioning of multiple cylinders, not only allows multiple cylinders to extend and retract synchronously, but also enables higher precision synchronous positioning of multiple cylinders through the cooperation of electromagnetic ball valve and displacement sensor, and the different pressure step settings of safety valve 1, first relief valve 17, and first relief valve 18.
[0044] In this specification, the present invention has been described with reference to specific embodiments thereof. However, it will be apparent that various modifications and variations can be made without departing from the spirit and scope of the present invention. Therefore, the specification and drawings should be considered illustrative rather than restrictive.
Claims
1. A hydraulic device for achieving synchronous and precise positioning of multiple cylinders, characterized in that, The device includes a safety valve, a solenoid directional valve, a one-way throttle valve, a synchronous motor, a first solenoid ball valve, a second solenoid ball valve, a first hydraulic lock, a second hydraulic lock, a first hydraulic cylinder, and a second hydraulic cylinder. The synchronous motor has two passages, one with an outlet at port A1 and the other with an outlet at port A2. The safety valve is connected to the solenoid directional valve. The P port of the solenoid directional valve is connected to an external PP oil circuit. The A port of the solenoid directional valve is connected to the left oil circuit of the one-way throttle valve. The inlets of both passages of the synchronous motor are connected to the one-way throttle valve. The right position of the first solenoid ball valve is connected to port A1 of the synchronous motor. The left position of the first hydraulic lock is connected to the right position of the first solenoid ball valve. The first hydraulic cylinder is connected to the first hydraulic lock. The left position of the second solenoid ball valve is connected to port A2 of the synchronous motor. The left position of the second hydraulic lock is connected to the left position of the second solenoid ball valve. The second hydraulic cylinder is connected to the second hydraulic lock. The right positions of both the first and second hydraulic locks are connected to the right position of the one-way throttle valve.
2. The hydraulic device for achieving synchronous and precise positioning of multiple cylinders according to claim 1, characterized in that, The synchronous motor includes a left motor, a first replenishing valve, and a first overflow valve. The first port of the left motor is connected to a one-way throttle valve, the second port of the left motor is connected to the A1 port of the synchronous motor, the second port of the left motor is also connected to the second port of the first replenishing valve, the first port of the first replenishing valve is connected to the return oil pipe of the straight-through oil tank, the first port of the first overflow valve is connected to the second port of the left motor, and the second port of the first overflow valve is connected to the return oil pipe of the straight-through oil tank.
3. The hydraulic device for achieving synchronous and precise positioning of multiple cylinders according to claim 1, characterized in that, The synchronous motor also includes a right motor, a second replenishing valve, and a second overflow valve. The first port of the right motor is connected to a one-way throttle valve, the second port of the right motor is connected to the A2 port of the synchronous motor, the second port of the right motor is also connected to the second port of the second replenishing valve, the first port of the second replenishing valve is connected to the return oil pipe of the straight-through oil tank, the first port of the second overflow valve is connected to the second port of the right motor, and the second port of the second overflow valve is connected to the return oil pipe of the straight-through oil tank.
4. The hydraulic device for achieving synchronous and precise positioning of multiple cylinders according to claim 1, characterized in that, The device further includes a first position sensor and a second position sensor, wherein the first position sensor is connected to the first hydraulic cylinder and the second position sensor is connected to the second hydraulic cylinder.
5. The hydraulic device for achieving synchronous and precise positioning of multiple cylinders according to claim 1, characterized in that, The safety valve has a set pressure higher than the set pressure of the first relief valve and the second relief valve, and the set pressure of the first relief valve and the second relief valve are the same.
6. The hydraulic device for achieving synchronous and precise positioning of multiple cylinders according to claim 1, characterized in that, If the first oil cylinder reaches the set position before the second oil cylinder, the electromagnet of the first solenoid ball valve is energized and reversed, cutting off the oil passage to the rodless chamber of the first oil cylinder. After the second oil cylinder extends to the set position, the solenoid reversing valve is de-energized, the valve core returns to the neutral position, and the first and second oil cylinders rely on each other.
7. The hydraulic device for achieving synchronous and precise positioning of multiple cylinders according to claim 1, characterized in that, If the second cylinder reaches the set position before the first cylinder, the electromagnet of the second solenoid ball valve is energized and reversed, cutting off the oil passage to the rodless chamber of the second cylinder. After the first cylinder extends to the set position, the solenoid reversing valve is de-energized, the valve core returns to the neutral position, and the first and second cylinders rely on each other.