Pressure-adaptive based synchronous lifting hydraulic system

Abstract

The utility model discloses a synchronous lifting hydraulic system based on pressure self -adaptation, it includes a plurality of hydraulic oil cylinder, the first control oil circuit of connecting oil tank with a plurality of hydraulic oil cylinder bottom, the second control oil circuit of connecting oil tank with a plurality of hydraulic oil cylinder top, respectively connect in a plurality of hydraulic oil cylinder bottom for controlling the flow of a plurality of flow valve for controlling the flow of entering hydraulic oil cylinder, the shuttle valve assembly of parallel in a plurality of flow valve export and the second overflow valve of connecting between shuttle valve assembly export and oil tank, and shuttle valve assembly is used for comparing a plurality of flow valve input hydraulic oil cylinder's pressure, the highest pressure liquid oil in shuttle valve assembly can overflow through second overflow valve. The utility model fundamentally avoids high pressure overflow loss under the premise of keeping through parallel speed regulation valve realizes high accuracy synchronization, significantly reduces energy consumption and system heating, especially suitable for the industrial lifting equipment of high requirement to energy -conservation and compactness.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic control systems, and in particular to a synchronous lifting hydraulic system based on pressure self-adaptation. Background Technology

[0002] Synchronous lifting systems are widely used in industrial equipment fields, such as lifting platforms, large equipment installations, and production lines.

[0003] Currently, there are many types of synchronous lifting systems on the market, but their basic principles are similar, consisting of a motor 1a, a hydraulic pump 2a, an overflow valve 5a, a reversing valve 4a, and a speed control valve. (See...) Figure 1 In a synchronous lifting system, when motor 1a rotates, hydraulic pump 2a draws in oil, which passes through high-pressure filter 3a and reaches directional valve 4a. The hydraulic oil then passes through directional valve 4a and reaches flow valve 6a. The flow rates set for all six flow valves 6a in the system are the same, ensuring that the hydraulic oil reaches the actuator cylinders at the same flow rate after passing through flow valve 6a. Consequently, the extension and retraction speeds of the six cylinders 7a are the same, achieving synchronous lifting. However, to ensure that the flow rate reaching each flow valve matches the set value, the total flow rate of the designed system must be at least higher than the required flow rate of the six cylinders to guarantee that the cylinder flow rate matches the flow valve set value during system operation, thus achieving synchronization. At this point, the total system flow rate is higher than the sum of the flow rates of the six cylinders. The excess hydraulic oil will overflow from the main relief valve 5a. To achieve this, the system pressure needs to reach the set pressure value of the main relief valve 5a. The set pressure value of the main relief valve 5a is the highest pressure of the system under full load, which is relatively high. Therefore, during system operation, the system pressure is always the pressure set by the main relief valve 5a, which is relatively high. When operating under high pressure, the system generates a lot of heat and consumes a lot of energy. However, when operating under no-load or low load, the system operates at the highest pressure, which generates a lot of heat and results in a significant energy loss.

[0004] Currently, the existing technology to address the problem of high heat generation is to increase the volume of the fuel tank and add heat dissipation devices. However, for some special occasions that require a smaller system footprint and greater integration, the above methods are simply not applicable.

[0005] Therefore, a technical solution is needed to overcome the above problems. Utility Model Content

[0006] In order to overcome some shortcomings in the existing technology, the purpose of this utility model is to provide a pressure-adaptive synchronous lifting hydraulic system to solve the above-mentioned technical problems.

[0007] To achieve its purpose, the present invention adopts the following technical solution: a pressure-adaptive synchronous lifting hydraulic system, comprising: Multiple hydraulic cylinders; The first control oil circuit connects the oil tank to the bottom of the plurality of hydraulic cylinders; The second control oil circuit connects the oil tank to the top of the multiple hydraulic cylinders; Multiple flow valves are respectively connected between the first control oil circuit and the bottom of the multiple hydraulic cylinders to control the flow rate entering the hydraulic cylinders; and A shuttle valve assembly includes multiple shuttle valves connected in parallel at the outlets of multiple flow valves, the multiple shuttle valves being used to compare the pressures input to the hydraulic cylinders by the multiple flow valves; The second relief valve is connected between the outlet of the shuttle valve assembly and the oil tank, and the highest pressure oil in the shuttle valve assembly can be overflowed through the second relief valve; During the process of the hydraulic oil in the tank being transported to the bottom of the cylinder through the first control oil circuit to drive the hydraulic cylinder to rise, the shuttle valve assembly is configured to guide the highest pressure among the multiple pressures compared to the second relief valve to overflow, so that the highest pressure among the multiple cylinders becomes the system pressure.

[0008] In some embodiments, the first control oil route is formed by sequentially connecting an oil tank, a hydraulic pump, a filter, and a reversing valve; The second control oil route is formed by connecting the oil tank and the reversing valve.

[0009] In some embodiments, the reversing valve is a four-way solenoid valve, whose four outlets can be connected to the first control oil circuit and the second control oil circuit, respectively.

[0010] In some embodiments, the number of flow valves is the same as the number of hydraulic cylinders, and the set flow rates of the multiple flow valves are the same.

[0011] In some embodiments, the shuttle valve assembly includes a plurality of shuttle valves, each shuttle valve being used to compare the hydraulic pressure at the outlets of the two flow valves, compare the hydraulic pressure between the flow valves and the shuttle valve, or compare the hydraulic pressure between the two shuttle valves.

[0012] In some embodiments, a first relief valve is also included for setting the maximum safety pressure of the system, the first relief valve being connected between the first control oil circuit and the oil tank.

[0013] In some embodiments, a pressure gauge is also included, which is connected to the outlet oil line of the first relief valve for monitoring system pressure.

[0014] This utility model is based on a pressure-adaptive synchronous lifting hydraulic system. It introduces a pressure-adaptive circuit composed of a shuttle valve assembly and a second relief valve, so that the system's relief pressure is no longer a fixed maximum pressure, but is determined by the real-time maximum working pressure of multiple actuator cylinders. Under no-load or low-load conditions, the system pressure can adaptively reduce to a lower level, fundamentally reducing the energy lost through relief and achieving a significant energy-saving effect.

[0015] This utility model is based on a pressure-adaptive synchronous lifting hydraulic system. Because the system pressure is adaptively adjusted according to the load, the system operates at a pressure lower than the maximum pressure for most of the working time when it is not fully loaded. The heat generated by the hydraulic oil due to high-pressure overflow is greatly reduced. This not only reduces the overall temperature of the system, but also reduces the dependence on large-capacity oil tanks or external cooling devices, thereby improving the reliability and service life of the system.

[0016] This utility model is based on a pressure-adaptive synchronous lifting hydraulic system, which solves the heat generation problem from the hydraulic principle level. It does not require "post-hoc remedial" measures such as increasing the oil tank or adding a radiator, which is conducive to the miniaturization and integration of the system, making it applicable to occasions with strict space requirements.

[0017] This utility model is based on a pressure-adaptive synchronous lifting hydraulic system. While achieving energy saving, it fully retains the method of controlling the synchronization accuracy through multiple parallel flow valves with the same set flow rate, ensuring that the synchronization of lifting of each cylinder is not affected.

[0018] This utility model is based on a pressure-adaptive synchronous lifting hydraulic system. By using a shuttle valve assembly to automatically select the highest pressure among multiple cylinders as the system working pressure, it can effectively cope with the situation where the pressure of each cylinder is inconsistent due to uneven load distribution (eccentric load). This ensures that the system can still work stably and efficiently under complex working conditions, and avoids synchronous failure or system shock caused by excessive pressure in a single cylinder. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a synchronous lifting system in the prior art; Figure 2 This is a schematic diagram of the synchronous lifting hydraulic system based on pressure self-adaptation in this utility model. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] It should be noted that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0023] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between the components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0024] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0025] In the above description, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0026] Figure 2 This is a schematic diagram of the overall structure of the pressure-adaptive synchronous lifting hydraulic system of this utility model.

[0027] like Figure 2 As shown, the pressure-adaptive synchronous lifting hydraulic system (hereinafter referred to as the hydraulic system) can be connected to multiple hydraulic cylinders 7 to simultaneously control the output of multiple hydraulic cylinders 7, thereby realizing the lifting of a certain device (e.g., lifting laser lifting platform). It includes a motor 1, a hydraulic pump 2, a filter 3, a directional valve 4, a flow valve 6, a relief valve, a shuttle valve assembly 8, and an oil tank 10. The oil tank 10, hydraulic pump 2, filter 3, and directional valve 4 are connected in sequence to form a first control oil circuit. The motor 1 is connected to the hydraulic pump 2 and can control the hydraulic pump 2 to draw oil from the oil tank 10. The oil tank 10 and directional valve 4 are connected to form a second control oil circuit. The directional valve 4 can be connected to the bottom of the oil cylinder through the flow valve 6, or it can be converted to be directly connected to the top of the oil cylinder and the oil tank 10. That is, the motor 1 controls the hydraulic pump 2 to draw oil from the oil tank 10. After the oil passes through the filter 3, it enters the directional valve 4 and can control the oil to turn between entering the bottom of the oil cylinder, the top of the oil cylinder, and the oil tank 10. The first control oil circuit and the second control oil circuit are switched through the directional valve 4. The shuttle valve assembly 8 is positioned between the flow valve 6 and the relief valve, which is also connected to the oil tank 10. During lifting, the shuttle valve assembly 8 compares the highest inlet pressure among the multiple hydraulic cylinders 7, then guides the hydraulic oil with the highest pressure to the second relief valve for overflow. The hydraulic oil then flows back to the oil tank 10 according to the pressure. The highest working pressure in the entire lifting hydraulic system is used as the overflow pressure of the shuttle valve assembly 8, and excess hydraulic oil overflows from the shuttle valve assembly 8 into the oil tank 10. Therefore, during system operation, the system pressure is determined by the actual load. Under no-load or low-load conditions, the system pressure is relatively low, resulting in less heat generation and energy loss.

[0028] The number of flow valves 6 is the same as the number of hydraulic cylinders 7. Before entering each hydraulic cylinder 7, the flow rate of the hydraulic oil is controlled by the flow valves 6, ensuring stable fluid intake and stable operation of each cylinder 7. Specifically, in this embodiment, six hydraulic cylinders 7 are used for lifting and lowering the device, connected in parallel. Six flow valves 6 are also provided: a first flow valve 61, a second flow valve 62, a third flow valve 63, a fourth flow valve 64, a fifth flow valve 65, and a sixth flow valve 66. These six flow valves 6 are connected between the directional valve 4 and the bottom of each of the six hydraulic cylinders 7. The hydraulic oil output from the directional valve 4 enters the cylinders after passing through each of the six flow valves 6. The flow rates set for the six flow valves 6 are the same, ensuring that the input flow to each hydraulic cylinder 7 is the same. Consequently, the extension and retraction speeds of the six hydraulic cylinders 7 are the same, achieving synchronous lifting and lowering. By setting six flow valves 6 to control the six hydraulic cylinders 7 respectively, the fluid intake of each hydraulic cylinder 7 can be stabilized, ensuring stable lifting and lowering of the device.

[0029] Preferably, the reversing valve 4 is a four-way solenoid valve, whose four outlets can be connected to the first control oil circuit, the second control oil circuit, the bottom of the hydraulic cylinder 7, and the top of the hydraulic cylinder 7, respectively. Through the reversing valve 4, the first control oil circuit can be switched between connecting to the bottom of the hydraulic cylinder 7 and connecting to the top of the hydraulic cylinder 7, and the second control oil circuit can be switched between connecting to the top of the hydraulic cylinder 7 and connecting to the bottom of the hydraulic cylinder 7.

[0030] Two relief valves are provided: a first relief valve 5 and a second relief valve 9. The inlet of the first relief valve 5 is connected to the inlet of the directional valve 4, and the outlet is connected to the oil tank 10. When the hydraulic oil pressure in the first control oil circuit exceeds the predetermined pressure, the excess hydraulic oil can overflow through the first relief valve 5 and flow back to the oil tank 10. The inlet of the second relief valve 9 is connected to the outlet of the shuttle valve assembly 8, and the outlet is connected to the inlet of the oil tank 10. When the pressure in the hydraulic system is greater than that of the multiple shuttle valves in the shuttle valve assembly 8, the excess oil can also flow back to the oil tank 10 through the second relief valve 9. This solves the problem of inconsistent working pressures of the six cylinders due to potential off-center loading of the laser lifting platform during actual operation. The function of the five shuttle valves in the shuttle valve assembly 8 is to take the maximum working pressure of the six cylinders as the relief pressure of the second relief valve 9. Therefore, during operation, the system pressure is the highest pressure among the six cylinders.

[0031] The shuttle valve assembly 8 includes multiple shuttle valves connected to the outlets of multiple flow valves 6, allowing the inlet pressure between multiple hydraulic cylinders 7 to be compared through the multiple shuttle valves. The hydraulic oil with the highest pressure is overflowed through the second relief valve 9, making the highest working pressure in the entire lifting hydraulic system the overflow pressure of the shuttle valve assembly 8. As a result, the excess hydraulic oil overflows from the shuttle valve assembly 8 into the oil tank 10. Specifically, in this embodiment, there are five shuttle valves: a first shuttle valve 81, a second shuttle valve 82, a third shuttle valve 83, a fourth shuttle valve 84, and a fifth shuttle valve 85. The first shuttle valve 81 is connected to the outlet of the first flow valve 61, the outlet of the second flow valve 62, and the inlet of the fifth shuttle valve 85. The second shuttle valve 82 is connected to the outlet of the third flow valve 63, the outlet of the fourth flow valve 64, and the fourth shuttle valve 84. The third shuttle valve 83 is connected to the outlet of the fifth flow valve 65, the outlet of the sixth flow valve 66, and the fourth shuttle valve 84. The fourth shuttle valve 84 is also connected to the fifth shuttle valve 85. The fifth shuttle valve 85 is also connected to the second relief valve 9. Through the filtering of the five shuttle valves, the highest pressure among the working pressures of the six cylinders flowing through the shuttle valves to the oil tank 10 is selected, rather than the maximum pressure of the system. The hydraulic cylinder 7 can operate under no-load or low load. When the system is working, the system pressure is determined by the actual load. The system does not need to operate at the highest pressure. The system generates less heat and consumes less energy.

[0032] It is understandable that in some devices with different numbers of hydraulic cylinders 7, the number of shuttle valves can also be increased or decreased accordingly, as long as the pressure at the inlet between multiple hydraulic cylinders 7 can be adjusted according to the load, and there is no limitation here.

[0033] It also includes a pressure gauge 11 for detecting the hydraulic oil pressure in the hydraulic system. Specifically, in this embodiment, the pressure gauge 11 is connected to the outlet of the filter 3, which can detect the hydraulic oil pressure coming out of the filter 3, display the pressure value at that point in real time, and facilitate the adjustment of the set pressure when using the downstream shuttle valve assembly 8 and relief valve.

[0034] The hydraulic system in this utility model is used as follows: When the device rises, motor 1 rotates, hydraulic pump 2 draws in oil, and impurities are removed by high-pressure filter 3. After ensuring the oil is clean, it enters reversing valve 4. Reversing valve 4 switches to the lifting position. At this time, hydraulic oil flows out from reversing valve 4 and enters six flow valves 6 (first flow valve 61 to sixth flow valve 66). The set flow rate of each flow valve 6 is the same, ensuring that the flow rate distributed to each hydraulic cylinder 7 is consistent, thereby ensuring that the six cylinders extend at the same speed and achieve synchronous lifting. That is, the hydraulic cylinder 7 is supplied with fluid through the first control oil circuit, causing the hydraulic cylinder 7 to rise. The hydraulic oil at the top of the hydraulic cylinder 7 will return to the oil tank 10 through reversing valve 4. That is, the hydraulic oil at the top of the hydraulic cylinder 7 can return to the oil tank 10 through the second control oil circuit without affecting the rise of the hydraulic cylinder 7.

[0035] When the device descends, motor 1 rotates, hydraulic pump 2 draws in oil, and impurities are removed through high-pressure filter 3. After ensuring the oil is clean, it enters reversing valve 4. Reversing valve 4 switches to the descending position, and hydraulic oil flows out from reversing valve 4 and enters the top of the six oil cylinders 7 respectively. The hydraulic oil at the bottom of oil cylinder 7 flows out from the bottom of oil cylinder 7 and enters the six flow valves 6 respectively. The set flow rate of each flow valve 6 is the same, ensuring that the flow rate out of each hydraulic cylinder 7 is consistent, thereby ensuring that the six oil cylinders retract at the same speed and achieve synchronous descent.

[0036] During the lifting process, the shuttle valve assembly 8 (including the first shuttle valve 81 to the fifth shuttle valve 85) monitors the inlet pressure of each cylinder in real time. Multiple shuttle valves compare the working pressures of the six cylinders, select the highest pressure value, and transmit this pressure to the second relief valve 9 (pressure valve). The second relief valve 9 sets the relief pressure based on this highest pressure, allowing excess hydraulic oil to overflow back to the oil tank 10. In this way, the system's working pressure is always determined by the actual load (i.e., the highest working pressure among the six cylinders), rather than a fixed maximum system pressure. Under no-load or low-load conditions, the system pressure is lower, thus reducing heat generation and energy loss. During the descent process, the hydraulic oil mainly flows back to the oil tank 10 through the flow valve 6, and the shuttle valve assembly 8 no longer functions.

[0037] Furthermore, in the first control oil circuit, if the pressure rises abnormally (e.g. due to blockage or overload), the first relief valve 5 will open to overflow excess hydraulic oil back to the oil tank 10, thus providing a safety protection function.

[0038] This utility model is based on a pressure-adaptive synchronous lifting hydraulic system. By adding a shuttle valve circuit, the working pressure of the hydraulic system is made to correspond to the actual load pressure. This allows the pressure to be adjusted adaptively under non-full load conditions, thereby reducing heat generation and energy loss.

[0039] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and all such modifications and improvements fall within the protection scope of this utility model.

Claims

1. A pressure-adaptive synchronous lifting hydraulic system, characterized in that, include: Multiple hydraulic cylinders; The first control oil circuit connects the oil tank to the bottom of the plurality of hydraulic cylinders; The second control oil circuit connects the oil tank to the top of the multiple hydraulic cylinders; Multiple flow valves are respectively connected between the first control oil circuit and the bottom of the multiple hydraulic cylinders to control the flow rate entering the hydraulic cylinders; as well as A shuttle valve assembly includes multiple shuttle valves connected in parallel at the outlets of multiple flow valves, the multiple shuttle valves being used to compare the pressures input to the hydraulic cylinders by the multiple flow valves; The second relief valve is connected between the outlet of the shuttle valve assembly and the oil tank, and the highest pressure oil in the shuttle valve assembly can overflow through the second relief valve; During the process of the hydraulic oil in the tank being transported to the bottom of the cylinder through the first control oil circuit to drive the hydraulic cylinder to rise, the shuttle valve assembly is configured to guide the highest pressure among the multiple pressures compared to the second relief valve to overflow, so that the highest pressure among the multiple cylinders becomes the system pressure.

2. The pressure-adaptive synchronous lifting hydraulic system according to claim 1, characterized in that, The first control oil route is formed by sequentially connecting an oil tank, a hydraulic pump, a filter, and a reversing valve; The second control oil route is formed by connecting the oil tank and the reversing valve.

3. The pressure-adaptive synchronous lifting hydraulic system according to claim 2, characterized in that, The reversing valve is a four-way solenoid valve, and its four outlets can be connected to the first control oil circuit and the second control oil circuit respectively.

4. The pressure-adaptive synchronous lifting hydraulic system according to any one of claims 1-3, characterized in that, The number of flow valves is the same as the number of hydraulic cylinders, and the set flow rates of multiple flow valves are the same.

5. The pressure-adaptive synchronous lifting hydraulic system according to any one of claims 1-3, characterized in that, Each of the shuttle valves is used to compare the hydraulic pressure at the outlets of the two flow valves, compare the hydraulic pressure between the flow valve and the shuttle valve, or compare the hydraulic pressure between the two shuttle valves.

6. The pressure-adaptive synchronous lifting hydraulic system according to any one of claims 1-3, characterized in that, It also includes a first relief valve for setting the maximum safety pressure of the system, the first relief valve being connected between the first control oil circuit and the oil tank.

7. The pressure-adaptive synchronous lifting hydraulic system according to claim 6, characterized in that, It also includes a pressure gauge connected to the outlet oil line of the first relief valve for monitoring system pressure.

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