Platform speed control system
By designing a platform speed control system that combines a three-way flow valve, a one-way valve, a two-way reversing valve and an electrically proportional two-way flow valve, the problems of insufficient stability and high cost in speed control of the lifting platform are solved, and the Smooth movement and efficient work, and reduced manufacturing costs.
Patent Information
- Application Number
- CN202421220112.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-31
- Publication Date
- 2025-01-21
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The prior art has problems of insufficient stability and high cost in the speed control of lifting platform, making it difficult to achieve stable movement and efficient work, and at the same time, the manufacturing cost is high.
Design a platform speed control system that uses a three-way flow valve, a first one-way valve, a second one-way valve, a first two-position two-way reversing valve, and a second two-position two-way reversing valve for joint control, combined with an electric The proportional two-way flow valve realizes two-stage speed control of fast forward and slow forward of the lifting platform and maintains stability when the load changes.
It realizes the stable and rapid rise and smooth descent of the lifting platform, improves work efficiency, reduces manufacturing costs, and meets the needs of smooth movement and efficient work.
Smart Images
Figure CN222376839U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of hydraulic control and fluid transmission, in particular to a platform speed control system. Background Art
[0002] In engineering machinery, lifting platforms are widely used, and controlling their speed plays an important role in increasing the comfort of operators and improving work efficiency. In order to ensure the stability of operation, balancing valves are currently used in China, which increases manufacturing costs. Therefore, how to achieve stable movement of lifting platforms, improve work efficiency, and reduce manufacturing costs is currently a problem that needs to be solved urgently. Utility Model Content
[0003] The purpose of this patent is to design a lifting platform control system with stable speed operation, high working efficiency and low cost, so as to overcome the shortcomings of the prior art.
[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a platform speed control system, comprising an oil tank, a hydraulic pump is arranged inside the oil tank, a motor for providing power to the hydraulic pump is arranged outside the oil tank, the motor is connected to the hydraulic pump, the oil tank is connected to the inlet of the hydraulic pump, the outlet of the hydraulic pump is connected to the inlet of a two-position three-way reversing valve, the three-way outlets of the two-position three-way reversing valve are respectively connected to a second two-position two-way reversing valve, a three-way flow valve and a first one-way valve, the outlet of the second two-position two-way reversing valve is connected to the oil tank, the outlet of the three-way flow valve is connected to the inlet of the second one-way valve after merging with the outlet of the first one-way valve, the outlet of the second one-way valve is connected to the rodless chamber of the hydraulic cylinder, and the rod chamber of the hydraulic cylinder is connected to the oil tank.
[0005] Furthermore, the hydraulic pump is fixedly connected to the output shaft of the motor via a coupling.
[0006] Furthermore, the rodless chamber of the hydraulic cylinder is also connected to the inlet of the electric proportional two-way flow valve.
[0007] Furthermore, the outlet of the electric proportional two-way flow valve is connected to the inlet of the first two-position two-way reversing valve.
[0008] Furthermore, one outlet of the first two-position two-way reversing valve is connected to the oil tank.
[0009] Furthermore, another outlet of the first two-position two-way reversing valve is connected to a two-position three-way reversing valve.
[0010] Furthermore, the two-position three-way reversing valve, the second two-position two-way reversing valve, the three-way flow valve and the first one-way valve are all connected through a hydraulic pipe.
[0011] Compared with the prior art, the utility model provides a platform speed control system with the following features:
[0012] Beneficial effects:
[0013] 1. The platform speed control system can realize the fast forward and slow forward two-level speed control of the lifting platform by using the three-way flow valve, the first one-way valve, the second one-way valve, the first two-position two-way reversing valve and the second two-position two-way reversing valve for joint control. At the same time, it is not affected by the load change of the lifting platform, which improves the stability of the operation of the lifting platform when it rises.
[0014] 2. The platform speed control system adopts an electric proportional two-way flow valve to achieve speed control during the descent of the lifting platform. At the same time, the descent speed is not affected by changes in the load of the lifting platform, thereby improving the stability of the operation of the lifting platform during descent. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 This is a schematic diagram of the system connection structure of a platform speed control system of the utility model;
[0016] Figure 2 This is a schematic diagram of the structure of an electric proportional two-way flow valve of a platform speed control system of the utility model;
[0017] Figure 3 The utility model is a schematic diagram of the structure of a three-way flow valve of a platform speed control system.
[0018] In the figure: 1 oil tank, 2 hydraulic pump, 3 motor, 4 two-position three-way reversing valve, 5 first two-position two-way reversing valve, 6 second two-position two-way reversing valve, 7 first check valve, 8 three-way flow valve, 9 electric proportional two-way flow valve, 10 second check valve, 11 hydraulic cylinder. DETAILED DESCRIPTION
[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0020] See also Figure 1-3A platform speed control system in this embodiment includes an oil tank 1, a hydraulic pump 2 is arranged inside the oil tank 1, and a motor 3 for providing power to the hydraulic pump 2 is arranged outside the oil tank 1, the motor 3 is connected to the hydraulic pump 2, the oil tank 1 is connected to the inlet of the hydraulic pump 2, the outlet of the hydraulic pump 2 is connected to the inlet of the two-position three-way reversing valve 4, the three-way outlets of the two-position three-way reversing valve 4 are respectively connected to the second two-position two-way reversing valve 6, the three-way flow valve 8 and the first one-way valve 7, the outlet of the second two-position two-way reversing valve 6 is connected to the oil tank 1, the outlet of the three-way flow valve 8 merges with the outlet of the first one-way valve 7 and is connected to the inlet of the second one-way valve 10, the outlet of the second one-way valve 10 is connected to the rodless cavity of the hydraulic cylinder 11, the rod cavity of the hydraulic cylinder 11 is connected to the oil tank 1, the rodless cavity of the hydraulic cylinder 11 is also connected to the inlet of the electric proportional two-way flow valve 9, and the outlet of the electric proportional two-way flow valve 9 is connected to the inlet of the first two-position two-way reversing valve 5.
[0021] In this embodiment, by using the three-way flow valve 8, the first one-way valve 7, the second one-way valve 10, the first two-position two-way reversing valve 5, and the second two-position two-way reversing valve 6 for joint control, the fast forward and slow forward two-level speed control of the lifting platform can be achieved. At the same time, it is not affected by the load changes of the lifting platform, thereby improving the stability of the operation of the lifting platform when it rises.
[0022] In this embodiment, by adopting the electric proportional two-way flow valve 9, the speed control of the lifting platform during the descent process can be achieved. At the same time, the descent speed is not affected by the change of the load of the lifting platform, thereby improving the stability of the operation of the lifting platform during descent.
[0023] In this embodiment, the hydraulic pump 2 is fixedly connected to the output shaft of the motor 3 via a coupling.
[0024] In this embodiment, one outlet of the first 2-position 2-way reversing valve 5 is connected to the oil tank 1 , and the other outlet of the first 2-position 2-way reversing valve 5 is connected to the 2-position 3-way reversing valve 4 .
[0025] It should be noted that the two-position three-way reversing valve 4, the second two-position two-way reversing valve 6, the three-way flow valve 8 and the first one-way valve 7 are all connected through hydraulic pipes.
[0026] The working principle of the above embodiment is:
[0027] When the lifting device rises, the 2-position 3-way reversing valve 4 is powered on and works in the left position, the first 2-position 2-way reversing valve 5 works in the right position, and the motor 3 drives the hydraulic pump 2 to provide high-pressure oil for the entire system. If the system is in the fast-forward working state, the second 2-position 2-way reversing valve 6 works in the left position, and the hydraulic oil at the outlet of the 2-position 3-way reversing valve 4 is partially discharged through the three-way flow valve 8 ( Figure 3) flows to port A, and the other part flows into port B through the proportional relief valve 2 in the three-way flow valve 8. The hydraulic oil at port B passes through the first one-way valve 7 and merges with the hydraulic oil at port A of the three-way flow valve 8 to enter the second one-way valve 10 together, so that the hydraulic oil at the outlet of the two-position three-way reversing valve 4 all flows into the rodless chamber of the hydraulic cylinder 11. During the whole process, even if the load of the lifting platform changes, it will not affect the stable and rapid rise of the lifting platform. If the system is in the slow-forward working state, at this time, the second two-position two-way reversing valve 6 works in the right position, then part of the hydraulic oil at the outlet of the two-position three-way reversing valve 4 passes through the three-way flow valve 8 ( Figure 3 ) flows to port A, and the other part flows into port B through the proportional relief valve 2 in the three-way flow valve 8, and the hydraulic oil in the B port flows to the oil tank after passing through the second two-position two-way reversing valve 6. At this time, only the hydraulic oil in port A of the three-way flow valve 8 enters the second one-way valve 10, so that the hydraulic oil part of the outlet of the two-position three-way reversing valve 4 flows into the rodless chamber of the hydraulic cylinder 11. In this process, the pressure difference at both ends of the throttle valve 1 in the three-way flow valve 8 is always constant as the spring pressure of the relief valve in the three-way flow valve 8. According to the throttle flow formula, even if the load of the lifting platform changes at this time, it will not cause speed fluctuations when the lifting platform rises, thereby realizing the stable slow-forward working condition of the lifting platform. Regardless of whether it is fast-forward or slow-forward working condition, at this time, the hydraulic oil in the rod chamber of the hydraulic cylinder 11 flows to the oil tank.
[0028] When the lifting device descends, at this time, the two-position three-way reversing valve 4 works in the right position, and the first two-position two-way reversing valve 5 is energized to work in the left position. At this time, even if the motor 3 drives the hydraulic pump 2, the hydraulic oil of the hydraulic pump 2 returns to the oil tank after passing through the two-position three-way reversing valve 4. The hydraulic cylinder 11 begins to descend under the action of the load. At this time, the hydraulic oil in the rodless chamber of the hydraulic cylinder 11 passes through the electric proportional two-way flow valve 9, then flows to the inlet of the first two-position two-way reversing valve 5, and finally flows back to the oil tank. During the descent of the lifting platform, due to the electric proportional two-way flow valve 9 ( Figure 2 ) The pressure difference before and after the proportional throttle valve 1 in the proportional two-way flow valve 9 is constant to the spring pressure of the pressure reducing valve 2 in the proportional two-way flow valve 9. According to the throttle flow formula, even if the load changes at this time, it will not cause the speed fluctuation of the lifting platform. In addition, when the lifting device is descending, the flow rate can be adjusted by adjusting the opening of the proportional two-way flow valve 9, thereby controlling the descent speed of the lifting platform. After the above control, the speed adjustment of the lifting platform can be realized, and the lifting platform will not cause the descent speed fluctuation due to the change of the platform load during the descent process. During the descent of the lifting platform, no matter what the working conditions are, the hydraulic oil in the rod chamber of the hydraulic cylinder 11 is replenished through the oil tank.
[0029] When the lifting platform needs to stop at a certain position, the first two-position two-way reversing valve 5 works in the right position, and the two-position three-way reversing valve 4 works in the left position. At this moment, even if the motor 3 drives the hydraulic pump 2, the hydraulic oil of the hydraulic pump 2 returns to the oil tank after passing through the two-position three-way reversing valve 4, and the hydraulic oil in the rodless chamber of the hydraulic cylinder 11 has no circuit to flow, thereby realizing the stopping condition of the lifting platform.
[0030] The electrical components mentioned in the text are all electrically connected to the main controller and the power supply. The main controller can be a conventional known device such as a computer that plays a control role, and the existing public power connection technology is not described in detail in the text.
[0031] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.
[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A platform speed control system, comprising an oil tank (1), characterized in that: A hydraulic pump (2) is arranged inside the oil tank (1), and a motor (3) for providing power to the hydraulic pump (2) is arranged outside the oil tank (1). The motor (3) is connected to the hydraulic pump (2), and the oil tank (1) is connected to the inlet of the hydraulic pump (2). The outlet of the hydraulic pump (2) is connected to the inlet of a two-position three-way reversing valve (4). The three outlets of the two-position three-way reversing valve (4) are respectively connected to a second two-position two-way reversing valve (6), a three-way flow valve (8) and a first one-way valve (7). The outlet of the second two-position two-way reversing valve (6) is connected to the oil tank (1), and the outlet of the three-way flow valve (8) is connected to the inlet of the second one-way valve (10) after merging with the outlet of the first one-way valve (7). The outlet of the second one-way valve (10) is connected to the rodless chamber of the hydraulic cylinder (11), and the rod chamber of the hydraulic cylinder (11) is connected to the oil tank (1).
2. A platform speed control system according to claim 1, characterized in that: The hydraulic pump (2) is fixedly connected to the output shaft of the motor (3) via a coupling.
3. A platform speed control system according to claim 1, characterized in that: The rodless chamber of the hydraulic cylinder (11) is also connected to the inlet of the electric proportional two-way flow valve (9).
4. A platform speed control system according to claim 3, characterized in that: The outlet of the electric proportional two-way flow valve (9) is connected to the inlet of the first two-position two-way reversing valve (5).
5. A platform speed control system according to claim 4, characterized in that: One outlet of the first two-position two-way reversing valve (5) is connected to the oil tank (1).
6. A platform speed control system according to claim 4, characterized in that: Another outlet of the first 2-position 2-way reversing valve (5) is connected to the 2-position 3-way reversing valve (4).
7. A platform speed control system according to claim 1, characterized in that: The two-position three-way reversing valve (4), the second two-position two-way reversing valve (6), the three-way flow valve (8) and the first one-way valve (7) are all connected via hydraulic pipes.