Hydraulic system, control method thereof and multifunctional crown block

Abstract

The invention provides a hydraulic system, a control method thereof and a multifunctional crown block, the control method is applied to the hydraulic system, and the control method comprises the following steps: receiving a working signal given by an upper computer; wherein the working signal comprises the target hydraulic flow; acquiring a rotating speed parameter and a torque parameter of the servo motor and a hydraulic parameter detected by the pressure detection piece according to the working signal; wherein the rotating speed parameter comprises the current rotating speed, and the torque parameter comprises the current torque; calculating a target rotating speed of the servo motor corresponding to the target hydraulic flow according to the rotating speed parameter, the torque parameter and the hydraulic parameter; controlling the servo motor to rotate according to the target rotating speed so as to drive the hydraulic oil pump to provide the target hydraulic flow. Only when the upper computer gives the working signal, the servo motor and the hydraulic oil pump can execute the action command, the hydraulic system provides power only according to the needed rotating speed, and the hydraulic system has the advantages of reducing serious energy waste, being high in adaptability and low in maintenance cost.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic systems, and in particular to a hydraulic system and a control method thereof, and a multifunctional overhead crane. Background Art

[0002] The hydraulic system of the multifunctional overhead crane in the aluminum electrolysis workshop usually uses a constant speed three-phase motor with an ordinary load-sensitive system or an ordinary constant speed motor proportional system. In the narrow space of the multifunctional overhead crane in the aluminum electrolysis workshop, due to the characteristics of the traditional multifunctional overhead crane hydraulic system, the motor speed and voltage are output at a constant level. When the mechanism does not move or does not require a high speed, the electric energy cannot achieve the conservation of supply and demand, resulting in waste of resources such as electric energy standby and hydraulic energy unloading. Also due to the constant speed motor, sometimes the hydraulic system back pressure is high and the mechanism shakes greatly, which will affect the compactness of the mechanism over time, resulting in the inability to accurately adapt to the action requirements of different mechanisms. At the same time, the traditional system controls the pressure using a high-precision proportional pressure reducing valve, which is prone to failure due to oil contamination, increasing repair costs and maintenance difficulties.

[0003] Therefore, the traditional multi-functional overhead crane hydraulic system has problems such as serious energy waste, poor adaptability, and high maintenance cost. Summary of the invention

[0004] The main purpose of the present invention is to provide a hydraulic system and a control method thereof, and a multifunctional overhead crane, aiming to solve the technical problems of serious energy waste, poor adaptability and high maintenance cost in traditional multifunctional overhead crane hydraulic systems.

[0005] In a first aspect, the present invention provides a control method for a hydraulic system, which is applied to a hydraulic system, wherein the hydraulic system includes a hydraulic oil pump, a connecting oil block, a pressure detection component, an encoder and a servo motor, wherein the pressure detection component is mounted on the connecting oil block, the connecting oil block is mounted on the hydraulic oil pump, the hydraulic oil pump is transmission-connected to the servo motor, the pressure detection component is used to detect hydraulic parameters in the connecting oil block, the encoder is mounted on the servo motor and is used to obtain speed parameters and torque parameters of the servo motor, the servo motor is electrically connected to the pressure detection component and a host computer, and the control method includes:

[0006] Receiving a working signal given by the host computer; wherein the working signal includes a target hydraulic flow;

[0007] According to the working signal, a speed parameter and a torque parameter of the servo motor and a hydraulic parameter detected by the pressure detection element are obtained; wherein the speed parameter includes a current speed, and the torque parameter includes a current torque;

[0008] Calculating a target speed of the servo motor corresponding to the target hydraulic flow rate according to the speed parameter, the torque parameter and the hydraulic parameter;

[0009] According to the target rotation speed, the servo motor is controlled to rotate so as to drive the hydraulic oil pump to provide the target hydraulic flow.

[0010] In a specific embodiment, the control method further includes:

[0011] Receiving the initial working signal given by the host computer when starting up;

[0012] According to the initial working signal, obtaining the initial target speed of the servo motor;

[0013] The servo motor is controlled to rotate according to the initial target rotation speed.

[0014] In a specific embodiment, before receiving the working signal given by the host computer, the method further includes:

[0015] Acquire the working status of each mechanism of the multifunctional overhead crane electrically connected to the hydraulic system;

[0016] When it is determined that the working state of each mechanism of the multifunctional overhead crane is not in motion, controlling the host computer not to send the working signal;

[0017] When it is determined that the working state of each mechanism of the multifunctional overhead crane is in action, the host computer is controlled to send the working signal.

[0018] In a second aspect, the present invention provides a hydraulic system, comprising: a hydraulic oil pump, a connecting oil block, a pressure detection element, an encoder and a servo motor;

[0019] The pressure detection component is installed on the connecting oil block, the connecting oil block is installed on the hydraulic oil pump, the hydraulic oil pump is drivingly connected to the servo motor, the pressure detection component is used to detect the hydraulic parameters in the connecting oil block, and the encoder is installed on the servo motor and is used to obtain the speed parameters and torque parameters of the servo motor;

[0020] The servo motor is electrically connected to the pressure detection component and the host computer, and is used to execute a control method for a hydraulic system as described in the first aspect.

[0021] In a specific embodiment, the hydraulic system further includes a coupling, one end of the coupling is passed through a bearing of the hydraulic oil pump, and the other end of the coupling is mounted on a bearing of the servo motor.

[0022] In a specific embodiment, the hydraulic oil pump includes a body and a connecting pipeline, one end of the coupling is passed through a bearing of the body, one end of the connecting pipeline is connected to the body, and the other end of the connecting pipeline is connected to the connecting oil circuit block.

[0023] In a specific embodiment, the hydraulic system further includes a pump frame, and the hydraulic oil pump and the servo motor are both mounted on the pump frame.

[0024] In a specific embodiment, the pump frame includes a first mounting frame, a second mounting frame and a fixed frame, the first mounting frame is fixedly connected side by side with the second mounting frame, the fixed frame is installed to the bottom of the first mounting frame and the second mounting frame, the coupling is installed and fixed to the first mounting frame, and the servo motor is installed and fixed to the second mounting frame.

[0025] In a specific embodiment, the hydraulic system further includes a pressure-increasing valve, which is installed on the connecting oil circuit block; and the pressure detecting component includes a pressure sensor.

[0026] In a third aspect, the present invention provides a multifunctional overhead crane, comprising: a hydraulic system as described in any one of the second aspects.

[0027] In a hydraulic system and control method thereof and a multifunctional overhead crane of the present invention, when the servo motor receives a working signal sent by a host computer, the servo motor obtains the speed parameter, torque parameter and hydraulic parameter detected by the pressure detection component of the servo motor according to the working signal, wherein the speed parameter includes the current speed, and the torque parameter includes the current torque, and then the target speed corresponding to the servo motor and the target hydraulic flow is calculated according to the target hydraulic flow, speed parameter, torque parameter and hydraulic parameter, and finally the servo motor rotates according to the target speed to drive the hydraulic oil pump to provide the target hydraulic flow. Therefore, compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. Energy saving and high efficiency: Only when the host computer gives a working signal, the servo motor and hydraulic oil pump will execute the action command, and the hydraulic system only provides power according to the required speed. This method can provide power according to actual needs and avoid energy waste caused by continuous operation of traditional hydraulic systems.

[0029] 2. Precise adaptation of actions: Since the servo motor speed is controllable, it can better adapt to the actions of each mechanism, improving the working efficiency and accuracy of the multi-functional overhead crane and reducing equipment wear and failure rate caused by power mismatch.

[0030] 3. Reduce maintenance costs: The working hours of the hydraulic oil pump are reduced, which reduces the leakage of hydraulic system oil, lowers the oil temperature, and extends the service life of the hydraulic oil. At the same time, it solves the problem of oil contamination and failure caused by the use of high-precision proportional pressure reducing valves in traditional hydraulic systems, saves maintenance costs, and reduces labor input. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a flow chart of a control method of a hydraulic system provided by an embodiment of the present invention;

[0032] Figure 2 is a structural schematic diagram of a hydraulic system provided by an embodiment of the present invention;

[0033] Figure 3 is a schematic diagram of an exploded structure of a hydraulic system provided by an embodiment of the present invention;

[0034] Figure 4 is a schematic diagram of the three-dimensional structure of a hydraulic system provided by an embodiment of the present invention;

[0035] Figure 5 It is a three-dimensional structural schematic diagram of a hydraulic system provided by another embodiment of the present invention.

[0036] in:

[0037] 100. Hydraulic system; 1. Hydraulic oil pump; 11. Main body; 12. Connecting pipeline; 2. Connecting oil circuit block; 3. Pressure detection component; 4. Encoder; 5. Servo motor; 6. Coupling; 7. Pump frame; 71. First mounting frame; 72. Second mounting frame; 73. Fixed frame; 8. Pressure relief valve.

[0038] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0039] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" 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 invention 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 limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0043] See also Figure 1 , Figure 1 It is a flow chart of a control method of a hydraulic system provided by an embodiment of the present invention.

[0044] A control method for a hydraulic system provided by an embodiment of the present invention is applied to a hydraulic system 100. Figure 2 , Figure 21 is a schematic diagram of a hydraulic system 100 provided in an embodiment of the present invention. The hydraulic system 100 in the embodiment of the present invention can be applied to non-ferrous metal industry, multifunctional overhead crane in aluminum electrolysis workshop, etc.

[0045] The hydraulic system 100 includes a hydraulic oil pump 1, a connecting oil block 2, a pressure detection component 3, an encoder 4 and a servo motor 5. The pressure detection component 3 is installed on the connecting oil block 2, and the connecting oil block 2 is installed on the hydraulic oil pump 1. The hydraulic oil pump 1 is connected to the servo motor 5 in a transmission manner. The pressure detection component 3 is used to detect the hydraulic parameters in the connecting oil block 2. The encoder 4 is installed on the servo motor 5 and is used to obtain the speed parameter and torque parameter of the servo motor 5. The servo motor 5 is electrically connected to the pressure detection component 3 and the upper computer. The control method includes the following steps:

[0046] S100, receiving a working signal given by the host computer; wherein the working signal includes a target hydraulic flow;

[0047] S200, acquiring a speed parameter and a torque parameter of the servo motor 5 and a hydraulic parameter detected by the pressure detection element 3 according to the working signal; wherein the speed parameter includes a current speed, and the torque parameter includes a current torque;

[0048] S300, calculating a target speed of the servo motor 5 corresponding to the target hydraulic flow rate according to the speed parameter, the torque parameter and the hydraulic parameter;

[0049] S400 . According to the target rotation speed, control the servo motor 5 to rotate so as to drive the hydraulic oil pump 1 to provide the target hydraulic flow rate.

[0050] In this embodiment, the servo motor 5 is adjusted to adapt to the required rotation speed through the real-time parameters of the hydraulic system 100 fed back by the encoder 4 installed on the servo motor 5 and the pressure detection component 3 installed on the oil circuit block 2.

[0051] Specifically, the pressure detection component 3 is installed on the connecting oil block 2, and the connecting oil block 2 is installed on the hydraulic oil pump 1. The pressure detection component 3 can detect the hydraulic parameters in the connecting oil block 2 to feed back the system hydraulic parameters of the hydraulic system 100. In a specific embodiment, the pressure detection component 3 includes a pressure sensor.

[0052] The connecting oil circuit block 2 is a key component in the hydraulic system 100, which mainly plays the role of connecting and distributing oil. In the multifunctional overhead crane hydraulic energy-saving servo hydraulic system, the connecting oil circuit block 2 connects different hydraulic components (such as the hydraulic oil pump 1, the pressure detection component 3 and the pressure-raising valve 8, etc.) together, so that the oil can flow between these components along a predetermined path. It can integrate the oil circuits of the hydraulic system 100 to make the oil circuit layout more compact and reasonable. For example, it can distribute the oil output from the hydraulic oil pump 1 to the required branches to provide power for each actuator; at the same time, it can also collect the oil refluxed from each actuator and guide it back to the oil tank or other processing units.

[0053] The encoder 4 is mounted on the servo motor 5 and is used to obtain the speed parameter and torque parameter of the servo motor 5. The encoder 4 may be an encoder provided by the servo motor 5 or an additionally added encoder.

[0054] The servo motor 5 is electrically connected to the pressure detection component 3 and the upper computer (Programmable Logic Controller, PLC), and can receive the working signal given by the upper computer when working. The working signal includes the target hydraulic flow. In a specific embodiment, there is a preset corresponding relationship between the target hydraulic flow and the target speed. Therefore, when the target speed is subsequently calculated, the target hydraulic flow and the current parameters of the hydraulic system 100 can be referred to to obtain the target speed. Specifically, when the servo motor 5 receives the working signal sent by the upper computer, the speed parameter, torque parameter and hydraulic parameter detected by the pressure detection component 3 of the servo motor 5 are obtained according to the working signal, wherein the speed parameter includes the current speed, and the torque parameter includes the current torque, and then the target speed corresponding to the target hydraulic flow of the servo motor 5 is calculated according to the target hydraulic flow, speed parameter, torque parameter and hydraulic parameter, and finally according to the target speed, the servo motor 5 rotates to drive the hydraulic oil pump 1 to provide the target hydraulic flow.

[0055] Therefore, compared with the prior art, the control method of a hydraulic system provided by the embodiment of the present invention has the following beneficial effects:

[0056] 1. Energy saving and high efficiency: Only when the host computer gives a working signal, the servo motor 5 and the hydraulic oil pump 1 will execute the action command, and the hydraulic system 100 only provides power according to the required speed. This method can provide power according to actual needs and avoid energy waste caused by continuous operation of traditional hydraulic systems.

[0057] 2. Accurately adapt the action: Since the speed of the servo motor 5 is controllable, it can better adapt to the action of each mechanism, thereby improving the working efficiency and accuracy of the multifunctional overhead crane and reducing the equipment wear and failure rate caused by power mismatch.

[0058] 3. Reduce maintenance costs: The working time of the hydraulic oil pump 1 is reduced, thereby reducing the oil leakage of the hydraulic system 100, reducing the oil temperature, and extending the service life of the hydraulic oil. At the same time, it solves the problem of oil contamination and failure caused by the use of high-precision proportional pressure reducing valves in traditional hydraulic systems, saving maintenance costs and reducing labor input.

[0059] In a specific embodiment, the control method further includes the following steps:

[0060] Receiving the initial working signal given by the host computer when starting up;

[0061] According to the initial working signal, obtaining the initial target speed of the servo motor 5;

[0062] The servo motor 5 is controlled to rotate according to the initial target rotation speed.

[0063] In this embodiment, when the hydraulic system 100 is just turned on, the servo motor 5 needs to obtain the initial target speed of the servo motor 5 according to the initial working signal given by the host computer, and then control the rotation of the servo motor 5 according to the initial target speed. It can be understood that the initial working signal also includes the initial target hydraulic flow, so the initial target speed can be calculated with reference to the target hydraulic flow. In the subsequent working process, if it is judged that the current speed of the servo motor 5 does not reach the target speed corresponding to the target hydraulic flow according to the speed parameters and torque parameters of the servo motor 5, the real-time speed parameters and real-time torque parameters of the servo motor 5 and the real-time hydraulic parameters detected by the pressure detection component 3 can be detected by the encoder 4, and the target speed corresponding to the target hydraulic flow can be calculated, so as to adjust the speed of the servo motor 5 to drive the hydraulic oil pump 1 to provide the target hydraulic flow.

[0064] In a specific embodiment, before the step S100 receives the working signal given by the host computer, the following steps are also included:

[0065] Acquire the working status of each mechanism of the multifunctional overhead crane electrically connected to the hydraulic system 100;

[0066] When it is determined that the working state of each mechanism of the multifunctional overhead crane is not in motion, controlling the host computer not to send the working signal;

[0067] When it is determined that the working state of each mechanism of the multifunctional overhead crane is in action, the host computer is controlled to send the working signal.

[0068] In this embodiment, the various mechanisms of the multifunctional overhead crane include but are not limited to a pushing actuator, a lifting actuator and a traveling actuator. When the servo motor 5 receives a working signal from the host computer, the servo motor 5 and the hydraulic oil pump 1 will execute the action command and only provide the required speed to provide power. When the various mechanisms of the multifunctional overhead crane are not in action, the servo motor 5 does not receive the working signal and is in a stopped state; when the various mechanisms of the multifunctional overhead crane perform slow motion, the servo motor 5 receives the working signal and calculates the target speed corresponding to the target hydraulic flow according to the speed parameter corresponding to the target hydraulic flow given by the host computer program, the real-time speed parameter and real-time torque parameter of the servo motor 5 detected by the encoder 4, and the real-time hydraulic parameter detected by the pressure detection component 3. Therefore, the servo motor 5 only provides the target speed of the required flow, which effectively reduces the loss of electric energy.

[0069] See also Figure 2 , the embodiment of the present invention further provides a hydraulic system 100, comprising: a hydraulic oil pump 1, a connecting oil block 2, a pressure detection component 3, an encoder 4 and a servo motor 5;

[0070] The pressure detection component 3 is mounted on the connecting oil block 2, the connecting oil block 2 is mounted on the hydraulic oil pump 1, the hydraulic oil pump 1 is connected to the servo motor 5 in a transmission manner, the pressure detection component 3 is used to detect the hydraulic parameters in the connecting oil block 2, the encoder 4 is mounted on the servo motor 5 and is used to obtain the speed parameters and torque parameters of the servo motor 5. The servo motor 5 is electrically connected to the pressure detection component 3 and the host computer, and is used to execute a control method of a hydraulic system as described in any of the above embodiments.

[0071] In this embodiment, the hydraulic system 100 of the embodiment of the present invention can be applied to the non-ferrous metal industry, aluminum electrolysis workshop multifunctional overhead crane, etc. The servo motor 5 is adjusted by the real-time parameters of the hydraulic system 100 fed back by the encoder 4 installed on the servo motor 5 and the pressure detection member 3 installed on the oil circuit block 2 to adapt to the required speed.

[0072] Specifically, the pressure detection component 3 is installed on the connecting oil block 2, and the connecting oil block 2 is installed on the hydraulic oil pump 1. The pressure detection component 3 can detect the hydraulic parameters in the connecting oil block 2 to feed back the system hydraulic parameters of the hydraulic system 100. In a specific embodiment, the pressure detection component 3 includes a pressure sensor.

[0073] The connecting oil circuit block 2 is a key component in the hydraulic system 100, which mainly plays the role of connecting and distributing oil. In the multifunctional overhead crane hydraulic energy-saving servo hydraulic system, the connecting oil circuit block 2 connects different hydraulic components (such as the hydraulic oil pump 1, the pressure detection component 3 and the pressure-raising valve 8, etc.) together, so that the oil can flow between these components along a predetermined path. It can integrate the oil circuits of the hydraulic system 100 to make the oil circuit layout more compact and reasonable. For example, it can distribute the oil output from the hydraulic oil pump 1 to the required branches to provide power for each actuator; at the same time, it can also collect the oil refluxed from each actuator and guide it back to the oil tank or other processing units.

[0074] The encoder 4 is mounted on the servo motor 5 and is used to obtain the speed parameter and torque parameter of the servo motor 5. The encoder 4 may be an encoder provided by the servo motor 5 or an additionally added encoder.

[0075] The servo motor 5 is electrically connected to the pressure detection component 3 and the upper computer (Programmable Logic Controller, PLC), and can receive the working signal given by the upper computer when working. The working signal includes the target hydraulic flow. In a specific embodiment, there is a preset corresponding relationship between the target hydraulic flow and the target speed. Therefore, when the target speed is subsequently calculated, the target hydraulic flow and the current parameters of the hydraulic system 100 can be referred to to obtain the target speed. Specifically, when the servo motor 5 receives the working signal sent by the upper computer, the speed parameter, torque parameter and hydraulic parameter detected by the pressure detection component 3 of the servo motor 5 are obtained according to the working signal, wherein the speed parameter includes the current speed, and the torque parameter includes the current torque, and then the target speed corresponding to the target hydraulic flow of the servo motor 5 is calculated according to the target hydraulic flow, speed parameter, torque parameter and hydraulic parameter, and finally according to the target speed, the servo motor 5 rotates to drive the hydraulic oil pump 1 to provide the target hydraulic flow.

[0076] See also Figure 2-Figure 5 In a specific embodiment, the hydraulic system 100 further includes a coupling 6 , one end of the coupling 6 is passed through a bearing of the hydraulic oil pump 1 , and the other end of the coupling 6 is mounted on a bearing of the servo motor 5 .

[0077] In this embodiment, the coupling 6 is used to connect the hydraulic oil pump 1 and the servo motor 5 to transmit power.

[0078] See also Figure 2-Figure 5In a specific embodiment, the hydraulic oil pump 1 includes a main body 11 and a connecting pipe 12, one end of the coupling 6 is passed through the bearing of the main body 11, one end of the connecting pipe 12 is connected to the main body 11, and the other end of the connecting pipe 12 is connected to the connecting oil circuit block 2.

[0079] In this embodiment, the bearing of the body 11 of the hydraulic oil pump 1 is installed on the coupling 6, so that the body 11 can be connected to the servo motor 5 through the coupling 6. The body 11 of the hydraulic oil pump 1 is connected to the connecting oil block 2 through the connecting pipe 12.

[0080] The specific working principle is as follows: when the hydraulic oil pump 1 is working, the oil enters the inlet channel connected to the oil circuit block 2 from the hydraulic oil pump 1. Then, according to the oil circuit design of the hydraulic system 100, the oil is distributed to different branches through the internal channels. For example, if the pressure-generating valve 8 needs oil to adjust the pressure of the hydraulic system 100, the oil will flow to the pressure-generating valve 8 through the corresponding channel. The pressure detection component 3 monitors the oil pressure by connecting to a specific channel on the oil circuit block 2, and feeds back the pressure signal to the servo motor 5. After the oil completes the corresponding work task, such as pushing the actuator to move, the refluxed oil will be collected through the recovery channel connected to the oil circuit block 2, and then subjected to subsequent processing according to the system requirements, such as filtering, cooling, and returning to the oil tank.

[0081] See also Figure 2-Figure 5 In a specific embodiment, the hydraulic system 100 further includes a pressure-raising valve 8 , and the pressure-raising valve 8 is installed on the connecting oil circuit block 2 .

[0082] In this embodiment, the pressure-raising valve 8 is installed on the connecting oil circuit block 2 to adjust the pressure of the hydraulic system 100 .

[0083] In one embodiment, the pressure-raising valve 8 is threadedly connected to the connecting oil passage block 2 .

[0084] See also Figure 2-Figure 5 In a specific embodiment, the hydraulic system 100 further includes a pump frame 7 , and the hydraulic oil pump 1 and the servo motor 5 are both installed on the pump frame 7 .

[0085] In this embodiment, the pump bracket 7 is used to fix the hydraulic oil pump 1 and the servo motor 5 to ensure the stability of the hydraulic oil pump 1 and the servo motor 5 during operation and to avoid loose connection or deformation due to factors such as vibration.

[0086] The installation process of the hydraulic system 100 of this embodiment is as follows:

[0087] First, install the pressure-starting valve 8 and the pressure detection component 3 on the connecting oil circuit block 2. Then install the connecting oil circuit block 2 with the pressure-starting valve 8 and the pressure detection component 3 installed on the hydraulic oil pump 1. Then insert one end of the coupling 6 into the bearing of the hydraulic oil pump 1 body 11, and install the other end of the coupling 6 on the bearing of the servo motor 5. Finally, install the hydraulic oil pump 1 and the servo motor 5 on the pump frame 7.

[0088] See also Figure 2-Figure 5 In a specific embodiment, the pump frame 7 includes a first mounting frame 71, a second mounting frame 72 and a fixed frame 73. The first mounting frame 71 and the second mounting frame 72 are fixedly connected side by side. The fixed frame 73 is installed to the bottom of the first mounting frame 71 and the second mounting frame 72. The coupling 6 is installed and fixed to the first mounting frame 71, and the servo motor 5 is installed and fixed to the second mounting frame 72.

[0089] In this embodiment, the first mounting frame 71 can fix and install the coupling 6 of the hydraulic oil pump 1, and the second mounting frame 72 can fix the servo motor 5. The first mounting frame 71 and the second mounting frame 72 are fixedly connected side by side, so that one end of the coupling 6 is connected to the bearing of the hydraulic oil pump body 11, and the other end is connected to the bearing of the servo motor 5 to achieve the transmission connection between the hydraulic oil pump 1 and the servo motor 5. In addition, the fixing frame 73 is installed to the bottom of the first mounting frame 71 and the second mounting frame 72 to play a supporting role, thereby ensuring the stability of the hydraulic oil pump 1 and the servo motor 5 during operation.

[0090] In one embodiment, the body 11 is connected to the first mounting bracket 71 with bolts, and the first mounting bracket 71 is connected to the second mounting bracket 72 with bolts.

[0091] See also Figure 4-Figure 5 In one embodiment, the fixing frame 73 is also provided with a mounting hole, which serves to connect with other components.

[0092] An embodiment of the present invention further provides a multifunctional overhead crane, comprising: a hydraulic system 100 as described in any one of the above embodiments.

[0093] The various mechanisms of the multifunctional overhead crane include but are not limited to a lifting mechanism and a traveling mechanism. The hydraulic system 100 can provide hydraulic power for the various mechanisms of the multifunctional overhead crane.

[0094] Therefore, compared with the prior art, the hydraulic system 100 and the multifunctional overhead crane provided by the embodiment of the present invention have the following beneficial effects:

[0095] 1. Energy saving and high efficiency: Only when the host computer gives a working signal, the servo motor 5 and the hydraulic oil pump 1 will execute the action command, and the hydraulic system 100 only provides power according to the required speed. This method can provide power according to actual needs and avoid energy waste caused by continuous operation of traditional hydraulic systems.

[0096] 2. Accurately adapt the action: Since the speed of the servo motor 5 is controllable, it can better adapt to the action of each mechanism, thereby improving the working efficiency and accuracy of the multifunctional overhead crane and reducing the equipment wear and failure rate caused by power mismatch.

[0097] 3. Reduce maintenance costs: The working time of the hydraulic oil pump 1 is reduced, thereby reducing the oil leakage of the hydraulic system 100, reducing the oil temperature, and extending the service life of the hydraulic oil. At the same time, it solves the problem of oil contamination and failure caused by the use of high-precision proportional pressure reducing valves in traditional hydraulic systems, saving maintenance costs and reducing labor input.

[0098] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A control method for a hydraulic system, characterized in that: Applied to a hydraulic system, the hydraulic system includes a hydraulic oil pump, a connecting oil block, a pressure detection component, an encoder and a servo motor, the pressure detection component is installed on the connecting oil block, the connecting oil block is installed on the hydraulic oil pump, the hydraulic oil pump is connected to the servo motor by transmission, the pressure detection component is used to detect the hydraulic parameters in the connecting oil block, the encoder is installed on the servo motor and is used to obtain the speed parameter and torque parameter of the servo motor, the servo motor is electrically connected to the pressure detection component and the upper computer, and the control method includes: Receiving a working signal given by the host computer; wherein the working signal includes a target hydraulic flow; According to the working signal, a speed parameter and a torque parameter of the servo motor and a hydraulic parameter detected by the pressure detection element are obtained; wherein the speed parameter includes a current speed, and the torque parameter includes a current torque; Calculating a target speed of the servo motor corresponding to the target hydraulic flow rate according to the speed parameter, the torque parameter and the hydraulic parameter; According to the target rotation speed, the servo motor is controlled to rotate so as to drive the hydraulic oil pump to provide the target hydraulic flow.

2. A control method for a hydraulic system according to claim 1, characterized in that: The control method further comprises: Receiving the initial working signal given by the host computer when starting up; According to the initial working signal, obtaining the initial target speed of the servo motor; The servo motor is controlled to rotate according to the initial target rotation speed.

3. A control method for a hydraulic system according to claim 1, characterized in that: Before receiving the working signal given by the host computer, the method further includes: Acquire the working status of each mechanism of the multifunctional overhead crane electrically connected to the hydraulic system; When it is determined that the working state of each mechanism of the multifunctional overhead crane is not in motion, controlling the host computer not to send the working signal; When it is determined that the working state of each mechanism of the multifunctional overhead crane is in motion, the host computer is controlled to send the working signal.

4. A hydraulic system, characterized in that: include: Hydraulic oil pump, connecting oil block, pressure detection parts, encoder and servo motor; The pressure detection component is installed on the connecting oil block, the connecting oil block is installed on the hydraulic oil pump, the hydraulic oil pump is drivingly connected to the servo motor, the pressure detection component is used to detect the hydraulic parameters in the connecting oil block, and the encoder is installed on the servo motor and is used to obtain the speed parameters and torque parameters of the servo motor; The servo motor is electrically connected to the pressure detection element and the host computer, and is used to execute a control method for a hydraulic system as described in any one of claims 1 to 3.

5. A hydraulic system according to claim 4, characterized in that: The hydraulic system further comprises a coupling, one end of which is passed through a bearing of the hydraulic oil pump, and the other end of which is mounted on a bearing of the servo motor.

6. A hydraulic system according to claim 5, characterized in that: The hydraulic oil pump comprises a body and a connecting pipeline, one end of the coupling is passed through a bearing of the body, one end of the connecting pipeline is connected to the body, and the other end of the connecting pipeline is connected to the connecting oil circuit block.

7. A hydraulic system according to claim 5, characterized in that: The hydraulic system further comprises a pump frame, and the hydraulic oil pump and the servo motor are both mounted on the pump frame.

8. A hydraulic system according to claim 7, characterized in that: The pump frame includes a first mounting frame, a second mounting frame and a fixed frame. The first mounting frame is fixedly connected to the second mounting frame side by side. The fixed frame is installed to the bottom of the first mounting frame and the second mounting frame. The coupling is installed and fixed to the first mounting frame, and the servo motor is installed and fixed to the second mounting frame.

9. A hydraulic system according to claim 4, characterized in that: The hydraulic system further comprises a pressure-increasing valve, which is mounted on the connecting oil circuit block; and the pressure detecting component comprises a pressure sensor.

10. A multifunctional overhead crane, characterized in that: include: A hydraulic system as claimed in any one of claims 4 to 9.

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