Servo control system of hydraulic machine

Abstract

The utility model discloses a servo control system of a hydraulic machine, which comprises a hydraulic oil tank, the output end of the hydraulic oil tank is communicated with a flow velocity sensor, the output end of the flow velocity sensor is communicated with a hydraulic pump, the output end of the hydraulic pump is communicated with a servo valve, and the output end of the servo valve is communicated with an electric control valve. The output end of the electric control valve communicates with a hydraulic cylinder, the control end of the hydraulic pump is in bidirectional electric connection with a controller, the input end of the controller is in bidirectional electric connection with the output end of a flow velocity sensor, and the output end of the controller is in bidirectional electric connection with a control circuit. The injection amount of hydraulic oil can be judged through the flow speed sensor and the servo valve at the same time, when the hydraulic oil reaches the preset injection amount, the controller controls the hydraulic pump to be closed, meanwhile, the controller rapidly sends signals to the control circuit through the signal amplifier, and the control circuit drives the electric control valve to be closed; the hydraulic oil is further prevented from flowing.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic press driving, in particular to a servo control system of a hydraulic press. Background Art

[0002] A hydraulic press is a machine that uses liquid as the working medium and is made according to Pascal's principle to transfer energy to achieve various processes. A hydraulic press generally consists of three parts: the machine, the power system, and the hydraulic control system. Hydraulic presses are classified into valve hydraulic presses, liquid hydraulic presses, and engineering hydraulic presses. The principle is to use Pascal's law to make machines that use liquid pressure transmission. There are many types of hydraulic presses.

[0003] For example, the patent application number published on the China Patent Network is 201920340581.1, and the patent title is: "A flow-matching hydraulic press servo control system, comprising a flow-matching balancing valve, a two-position two-way solenoid valve, a servo motor, a duplex gear pump, and a hydraulic press master cylinder; the upper oil port of the flow-matching balancing valve is connected to the rod chamber of the master cylinder, the lower oil port is connected to the oil outlet of the small-flow gear pump of the duplex gear pump, and the side oil outlet is connected to the system oil tank; the duplex gear pump includes a large-flow gear pump and a small-flow gear pump; one end of the two-position two-way solenoid valve is connected to the oil outlet of the large-flow gear pump of the duplex gear pump, and the other end is connected to the system oil tank; the oil outlet of the small-flow gear pump of the duplex gear pump is simultaneously connected to one end of the two-position two-way solenoid valve through a one-way valve; the servo motor is connected to the duplex gear pump." The flow-matching hydraulic press servo control system of the utility model has low modification or installation cost, is reliable and stable in control, is environmentally friendly, is insensitive to oil temperature and cleanliness, and effectively ensures the positioning accuracy and system safety of the hydraulic press during slow downward movement.

[0004] However, existing hydraulic signals are transmitted through the flow of liquid in pipes. The speed is limited by the flow rate of the liquid and the layout of the pipes. The system's response speed is relatively slow, which causes the equipment to easily have residual movement after being closed, affecting the system's control accuracy and dynamic performance.

[0005] Therefore, it is necessary to design and transform the servo control system of the hydraulic press. Utility Model Content

[0006] In order to solve the problems raised in the above-mentioned background technology, the purpose of the present invention is to provide a servo control system for a hydraulic press, which has the advantage of improving driving accuracy and solves the problem that the hydraulic signal is transmitted through the flow of liquid in the pipeline, and its speed is limited by the flow speed of the liquid and the layout of the pipeline. The response speed of the system is relatively slow, which makes the equipment prone to residual movement after being closed, affecting the control accuracy and dynamic performance of the system.

[0007] To achieve the above-mentioned object, the present utility model provides the following technical solutions: A servo control system for a hydraulic press includes a hydraulic oil tank;

[0008] The output end of the hydraulic oil tank is connected to a flow rate sensor, the output end of the flow rate sensor is connected to a hydraulic pump, the output end of the hydraulic pump is connected to a servo valve, the output end of the servo valve is connected to an electric control valve, the output end of the electric control valve is connected to a hydraulic cylinder, the control end of the hydraulic pump is bidirectionally electrically connected to a controller, the input end of the controller is bidirectionally electrically connected to the output end of the flow rate sensor, the output end of the controller is bidirectionally electrically connected to a control circuit, and the output end of the control circuit is bidirectionally electrically connected to the control end of the electric control valve.

[0009] As a preferred embodiment of the present invention, the output end of the hydraulic cylinder is connected to a reflux pipeline, the output end of the reflux pipeline is connected to a reflux pump, and the output end of the reflux pump is connected to the hydraulic oil tank.

[0010] As a preferred embodiment of the present invention, a monitoring module is installed on the surface of the hydraulic cylinder, and the monitoring module is composed of a displacement sensor, a speed sensor and a touch pressure sensor.

[0011] As a preferred embodiment of the present invention, the output end of the controller is bidirectionally electrically connected to a data transceiver module, the output end of the data transceiver module is bidirectionally electrically connected to a cloud storage computer, and the data transceiver module is composed of a data cable and a wireless transceiver module.

[0012] As a preferred embodiment of the present invention, the output end of the monitoring module is bidirectionally electrically connected to an Internet of Things terminal, and the output end of the Internet of Things terminal is bidirectionally electrically connected to the input end of the data transceiver module.

[0013] As a preferred embodiment of the present invention, the output end of the controller is bidirectionally electrically connected to a signal amplifier, and the output end of the signal amplifier is bidirectionally electrically connected to the input end of the control circuit.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] 1. The utility model can simultaneously judge the hydraulic oil injection amount through the flow rate sensor and the servo valve. When the hydraulic oil reaches the predetermined injection amount, the controller controls the hydraulic pump to close. At the same time, the controller uses the signal amplifier to quickly send the signal to the control circuit. The control circuit drives the electric control valve to close, further preventing the flow of hydraulic oil.

[0016] 2. The utility model is capable of quickly draining the hydraulic oil inside the hydraulic cylinder by providing a return line and a return pump, thereby improving the resetting efficiency of the hydraulic cylinder.

[0017] 3. The utility model is capable of accurately monitoring the operating status of the hydraulic cylinder by setting a monitoring module to ensure the operating safety of the hydraulic cylinder.

[0018] 4. The utility model can store data in the cloud by setting up a data transceiver module and a cloud storage computer to prevent data loss and facilitate users to remotely grasp the operating status of the hydraulic cylinder.

[0019] 5. The present invention can centrally process data by setting up an Internet of Things terminal, thereby improving data flow efficiency.

[0020] 6. The utility model can improve the stability of signal transmission by setting a signal amplifier, which is convenient for driving the servo valve and the electric control valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the utility model system. DETAILED DESCRIPTION

[0022] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] like Figure 1 As shown, the utility model provides a servo control system for a hydraulic press, comprising a hydraulic oil tank;

[0024] The output end of the hydraulic oil tank is connected to a flow rate sensor, the output end of the flow rate sensor is connected to a hydraulic pump, the output end of the hydraulic pump is connected to a servo valve, the output end of the servo valve is connected to an electric control valve, the output end of the electric control valve is connected to a hydraulic cylinder, the control end of the hydraulic pump is bidirectionally electrically connected to a controller, the input end of the controller is bidirectionally electrically connected to the output end of the flow rate sensor, the output end of the controller is bidirectionally electrically connected to a control circuit, and the output end of the control circuit is bidirectionally electrically connected to the control end of the electric control valve.

[0025] refer to Figure 1 The output end of the hydraulic cylinder is connected to a return line, the output end of the return line is connected to a return pump, and the output end of the return pump is connected to the hydraulic oil tank.

[0026] As a technical optimization solution of the present invention, by providing a reflux pipeline and a reflux pump, the hydraulic oil inside the hydraulic cylinder can be quickly emptied, thereby improving the resetting efficiency of the hydraulic cylinder.

[0027] refer to Figure 1A monitoring module is installed on the surface of the hydraulic cylinder, which consists of a displacement sensor, a speed sensor and a touch pressure sensor.

[0028] As a technical optimization solution of the present invention, by setting up a monitoring module, the operating status of the hydraulic cylinder can be accurately monitored to ensure the operating safety of the hydraulic cylinder.

[0029] refer to Figure 1 The output end of the controller is bidirectionally electrically connected to a data transceiver module, and the output end of the data transceiver module is bidirectionally electrically connected to a cloud storage computer. The data transceiver module consists of a data cable and a wireless transceiver module.

[0030] As a technical optimization solution of the present invention, by setting up a data transceiver module and a cloud storage computer, data can be stored in the cloud to prevent data loss, making it convenient for users to remotely grasp the operating status of the hydraulic cylinder.

[0031] refer to Figure 1 The output end of the monitoring module is bidirectionally electrically connected to the Internet of Things terminal, and the output end of the Internet of Things terminal is bidirectionally electrically connected to the input end of the data transceiver module.

[0032] As a technical optimization solution of the present invention, by setting up an Internet of Things terminal, data can be processed centrally, which can improve the efficiency of data flow.

[0033] refer to Figure 1 The output end of the controller is bidirectionally electrically connected to the signal amplifier, and the output end of the signal amplifier is bidirectionally electrically connected to the input end of the control circuit.

[0034] As a technical optimization solution of the present invention, by providing a signal amplifier, the stability of signal transmission can be improved, making it easier to drive the servo valve and the electric control valve.

[0035] The working principle and usage process of the utility model are as follows: when in use, the hydraulic pump extracts the hydraulic oil inside the hydraulic oil tank and allows it to enter the hydraulic cylinder through the servo valve and the electric control valve. The hydraulic cylinder moves and the monitoring module is used to determine its movement distance. At the same time, the data is transmitted to the cloud storage computer using the Internet of Things terminal for online storage. During the hydraulic oil delivery process, the flow rate sensor and the servo valve can simultaneously determine the hydraulic oil injection amount. When the hydraulic oil reaches the predetermined injection amount, the controller controls the hydraulic pump to close. At the same time, the controller uses the signal amplifier to quickly send the signal to the control circuit. The control circuit drives the electric control valve to close, further preventing the flow of hydraulic oil.

[0036] To sum up: the servo control system of the hydraulic press can simultaneously judge the hydraulic oil injection amount through the flow rate sensor and the servo valve. When the hydraulic oil reaches the predetermined injection amount, the controller controls the hydraulic pump to close. At the same time, the controller uses the signal amplifier to quickly send the signal to the control circuit. The control circuit drives the electric control valve to close, further preventing the flow of hydraulic oil.

[0037] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0038] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A servo control system for a hydraulic press, comprising a hydraulic oil tank; Its characteristics are: The output end of the hydraulic oil tank is connected to a flow rate sensor, the output end of the flow rate sensor is connected to a hydraulic pump, the output end of the hydraulic pump is connected to a servo valve, the output end of the servo valve is connected to an electric control valve, the output end of the electric control valve is connected to a hydraulic cylinder, the control end of the hydraulic pump is bidirectionally electrically connected to a controller, the input end of the controller is bidirectionally electrically connected to the output end of the flow rate sensor, the output end of the controller is bidirectionally electrically connected to a control circuit, and the output end of the control circuit is bidirectionally electrically connected to the control end of the electric control valve.

2. A servo control system for a hydraulic press according to claim 1, characterized in that: The output end of the hydraulic cylinder is connected to a return line, the output end of the return line is connected to a return pump, and the output end of the return pump is connected to the hydraulic oil tank.

3. The servo control system of a hydraulic press according to claim 1, characterized in that: A monitoring module is installed on the surface of the hydraulic cylinder, and the monitoring module consists of a displacement sensor, a speed sensor and a touch pressure sensor.

4. A servo control system for a hydraulic press according to claim 3, characterized in that: The output end of the controller is bidirectionally electrically connected to a data transceiver module, the output end of the data transceiver module is bidirectionally electrically connected to a cloud storage computer, and the data transceiver module is composed of a data cable and a wireless transceiver module.

5. The servo control system of a hydraulic press according to claim 4, characterized in that: The output end of the monitoring module is bidirectionally electrically connected to the Internet of Things terminal, and the output end of the Internet of Things terminal is bidirectionally electrically connected to the input end of the data transceiver module.

6. The servo control system for a hydraulic press according to claim 1, characterized in that: The output end of the controller is bidirectionally electrically connected to a signal amplifier, and the output end of the signal amplifier is bidirectionally electrically connected to the input end of the control circuit.

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