Hydraulic machine control system

Abstract

The utility model belongs to the technical field of hydraulic machine control, and particularly relates to a hydraulic machine control system which is characterized in that light sensors are arranged in front of and behind each hydraulic station, and when detecting that workpieces exist in the stations, the light sensors send detection signals to a programmable logic controller (PLC). When the PLC receives the detection signal, the electromagnetic switch of the pneumatic valve at the corresponding station is controlled to be turned on; and when the starting switch is pressed down, a starting signal is sent to the PLC, so that the PLC controls the frequency converter to further control the motor to rotate at a preset frequency when receiving the starting signal. According to the technical scheme, whether workpieces exist in each hydraulic station or not can be automatically detected, if yes, the pneumatic valve electromagnetic switch of the corresponding hydraulic station is turned on, after an operator presses down the starting switch, the motor is controlled to rotate at the preset frequency, the motor is turned on in the working process and turned off in the non-working process, and the working efficiency is improved. And the hydraulic machine achieves the best energy-saving effect and speed control.

Description

Technical Field

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

[0002] The development history of hydraulic presses is over 100 years old. In the past two decades, many countries in the world have made new developments in various hydraulic presses, such as forging manipulators and forging hydraulic press linkage units, large die forging hydraulic presses, extrusion hydraulic presses, powder forming hydraulic presses, pipe forming hydraulic presses, etc. At present, hydraulic presses are used in thermal power, steel, automobiles, home appliances, coal, cement, building materials, petrochemicals, metallurgy and mining, municipal water supply and other industries.

[0003] Currently, a typical hydraulic press uses an electric motor to control an oil pump, rotating it to generate a constant flow rate. The hydraulic system then controls the direction of the oil flow, thereby controlling the movement of the various cylinders. Therefore, the main source of power consumption in a hydraulic press comes from the motor controlling the oil pump. Most hydraulic presses operate semi-automatically, meaning that after completing a cycle according to the product's process flow, the product is removed and reloaded manually or mechanically. During this entire production cycle, the hydraulic press spends a significant amount of time idle. Depending on the industry and product process, the motor and pump are typically unloaded for between 20% and 80% of the entire cycle, meaning the press consumes only electricity during this time. Some industries require the hydraulic press to maintain pressure, with varying durations. Hydraulic presses with long hold times (over one minute) typically have a stop-and-hold function. Shorter hold times are not possible due to the motor's inability to start and stop frequently. Larger hydraulic presses, with their larger motors, often lack this function. Consequently, current hydraulic presses consume considerable energy. Utility Model Content

[0004] To this end, the utility model provides a hydraulic press control system to solve the problem of high energy consumption of current hydraulic presses.

[0005] In order to achieve the above objectives, the present invention adopts the following technical solutions:

[0006] A hydraulic press control system, comprising:

[0007] PLC controller, frequency converter, multi-way pneumatic valve solenoid switch, multiple light sensors, start switch;

[0008] Light sensors are arranged in front of and behind each hydraulic station, and are connected to the PLC controller. When the light sensors detect the presence of a workpiece in the hydraulic station, they send a detection signal to the PLC controller.

[0009] The PLC controller is connected to the multi-way pneumatic valve solenoid switches respectively. When the PLC controller receives the detection signal, it controls the pneumatic valve solenoid switches of the corresponding hydraulic stations to open;

[0010] The start switch is connected to the PLC controller, the PLC controller is connected to the frequency converter through a communication interface, and the frequency converter is connected to the motor. When the start switch is pressed, a start signal is sent to the PLC controller, so that when the PLC controller receives the start signal, it controls the frequency converter and then controls the motor to rotate at a preset frequency.

[0011] Preferably, the number of the pneumatic valve electromagnetic switches is 3, and the number of the light sensors is 6.

[0012] Preferably, the pneumatic valve solenoid switch is connected to the pneumatic high-pressure ball valve of the hydraulic station. When the pneumatic valve solenoid switch is turned on, the pneumatic high-pressure ball valve is controlled to open.

[0013] Preferably, the hydraulic press control system further includes:

[0014] A display screen is connected to the PLC controller.

[0015] Preferably, the hydraulic press control system further includes:

[0016] Fault display indicator light and operation display indicator light;

[0017] The fault display indicator light and the operation display indicator light are both connected to the frequency converter.

[0018] Preferably, the starting switch is a foot switch.

[0019] The present invention adopts the above technical solution, which has at least the following beneficial effects:

[0020] It can be understood that the present invention relates to a hydraulic press control system, in which light sensors are arranged in front of and behind each hydraulic station. When the light sensors detect the presence of a workpiece in the hydraulic station, they send a detection signal to the PLC controller. When the PLC controller receives the detection signal, it controls the electromagnetic switch of the pneumatic valve of the corresponding hydraulic station to turn on; when the start switch is pressed, a start signal is sent to the PLC controller, so that when the PLC controller receives the start signal, it controls the frequency converter and then controls the motor to rotate at a preset frequency. The technical solution of the present invention can automatically detect whether there is a workpiece in each hydraulic station. If so, the electromagnetic switch of the pneumatic valve of the corresponding hydraulic station is turned on. After the operator presses the start switch, the motor is controlled to rotate at a preset frequency, thereby turning on the motor when working and stopping the motor when not working, so that the hydraulic press can achieve the best energy saving effect and speed control.

[0021] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory and are not restrictive of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 This is a schematic block diagram of a hydraulic press control system according to an exemplary embodiment of the present invention;

[0024] Figure 2 It is a schematic diagram showing the principle of a hydraulic press control system according to an exemplary embodiment of the present invention. DETAILED DESCRIPTION

[0025] To make the purpose, technical solution, and advantages of the present invention more clear, the technical solution of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0026] Figure 1 This is a schematic block diagram of a hydraulic press control system shown in an exemplary embodiment of the present invention. Figure 1 , provides a hydraulic press control system, comprising:

[0027] PLC controller, frequency converter, multi-way pneumatic valve solenoid switch, multiple light sensors, start switch;

[0028] Light sensors are arranged in front of and behind each hydraulic station, and are connected to the PLC controller. When the light sensors detect the presence of a workpiece in the hydraulic station, they send a detection signal to the PLC controller.

[0029] The PLC controller is connected to the multi-way pneumatic valve solenoid switches respectively. When the PLC controller receives the detection signal, it controls the pneumatic valve solenoid switches of the corresponding hydraulic stations to open;

[0030] The start switch is connected to the PLC controller, the PLC controller is connected to the frequency converter through a communication interface, and the frequency converter is connected to the motor. When the start switch is pressed, a start signal is sent to the PLC controller, so that when the PLC controller receives the start signal, it controls the frequency converter and then controls the motor to rotate at a preset frequency.

[0031] In specific practice, the technical solution shown in this embodiment can set up multiple light sensors, PLC controllers and frequency converters on the control system of the hydraulic press. The frequency converter and the PLC controller are provided with a 485 communication interface, and the frequency converter can be connected to the PLC controller through the communication interface.

[0032] In actual application scenarios, the hydraulic press is mainly composed of three hydraulic workstations. Therefore, the number of the pneumatic valve solenoid switches is 3 and the number of the light sensors is 6.

[0033] A light sensor independently detects the presence of a workpiece on each hydraulic line and automatically transmits the detected signal to the PLC controller. When a workpiece is detected, the corresponding pneumatic valve solenoid switch opens. It should be noted that each pneumatic valve solenoid switch is connected to the pneumatic high-pressure ball valve of the hydraulic station on that line. When the pneumatic valve solenoid switch is turned on, it controls the opening of the pneumatic high-pressure ball valve. Therefore, when the PLC controller detects the presence of a workpiece at a hydraulic station, it can open the pneumatic high-pressure ball valve at that hydraulic station and remove the hydraulic workpiece.

[0034] When the start switch is pressed, the PLC receives the start signal and controls the frequency converter to start the oil pump motor. The preset frequency can be 50-60 Hz. When the start switch is released, the frequency converter reduces the frequency to 0 Hz, and the oil pump motor stops running. When the worker removes the workpiece, the light sensor cannot sense the workpiece, and the PLC controller automatically controls the pneumatic valve solenoid switch to close, thereby closing the pneumatic high-pressure ball valve. Therefore, the hydraulic press control system shown in this embodiment can achieve high efficiency and energy saving, and provide energy on demand.

[0035] It should be noted that the hydraulic press control system further includes:

[0036] A display screen is connected to the PLC controller and can be configured to synchronously display the working status of the entire hydraulic press.

[0037] It can be understood that by providing a display screen, the operator can understand the working status of the hydraulic press.

[0038] It should be noted that the hydraulic press control system further includes:

[0039] Fault display indicator light and operation display indicator light;

[0040] The fault display indicator light and the operation display indicator light are both connected to the frequency converter.

[0041] It is understandable that by setting the indicator light, the current status of the inverter can be indicated, which is convenient for the staff to operate and maintain the inverter daily.

[0042] It should be noted that the start switch is a foot switch. In specific practice, by setting the start switch as a foot switch, it is convenient for the operator to use and operate it daily, which can improve work efficiency.

[0043] The hydraulic press control system shown in this embodiment can be used to control the three working cylinders of the hydraulic press to operate as follows:

[0044] First, when the oil pump motor starts, the PLC controller outputs a start signal and a given frequency to the frequency converter, and the given frequency is 0HZ; when a certain workstation is in use, when the light sensor detects a workpiece, it automatically opens the high-pressure pneumatic ball valve of the corresponding workstation, and the status indication of the workstation is displayed on the touch screen; when the staff steps on the foot switch, the PLC controller sends the preset frequency to the frequency converter, so that the frequency converter increases the frequency to the preset frequency of 50-60HZ within 0.1-0.3 seconds, at which time the pressurized oil cylinder moves downward and starts working; when the staff releases the foot switch, the oil pump motor can delay shutdown according to actual conditions, the oil cylinder moves upward, and the motor automatically stops working when it reaches the top dead center, and the working status is synchronously displayed on the touch screen; when the light sensor of the workstation detects that there is no workpiece at the workstation, the pneumatic high-pressure electric ball valve of the corresponding workstation is automatically closed.

[0045] Figure 2 This is a schematic diagram of a hydraulic press control system according to an exemplary embodiment of the present invention. Figure 2 ,exist Figure 2In this example, the QS wave generator functions as a frequency converter, while valve ports 1, 2, 3, the pressure valve / high-speed section port, and the node start port are all control ports of the PLC controller. The PLC controller controls valve 1, which controls the pneumatic valve solenoid switch for the first hydraulic position; valve 2, which controls the pneumatic valve solenoid switch for the second hydraulic position; and valve 3, which controls the pneumatic valve solenoid switch for the third hydraulic position. The PLC frequency converter outputs a start signal to the frequency converter via the node start port and a frequency-increasing signal to the frequency converter via the pressure valve / high-speed section port.

[0046] In a specific practical scenario, taking workstation No. 1 as an example, once the operator determines the workpiece's position and places the workpiece in it, the optical sensor immediately detects the workpiece's status and sends a detection signal to the PLC controller, which then activates the corresponding multi-way pneumatic valve solenoid switch, thereby opening the pneumatic high-pressure ball valve. In traditional hydraulic presses, manual on / off valves are used, and improper use can damage the machine and personnel. Therefore, the technical solution illustrated in this embodiment automatically controls the opening and closing of the pneumatic high-pressure ball valve, ensuring both machine and personnel safety.

[0047] When the operator steps on the foot switch or presses the start switch, the PLC controller controls the motor to rotate at a high speed of 50-60Hz with a response time of 0.3 seconds, driving the hydraulic pump to drive the hydraulic system to perform operations such as punching or cutting; when the operator releases the foot switch or starts the switch, after a delay of 3-5 seconds and the hydraulic press returns to its position, the PLC controls the motor to stop rotating.

[0048] When the workpiece leaves the workstation, the control system detects that there is no workpiece material in the workstation, closes the pneumatic high-pressure ball valve, waits for the next workpiece, and repeats the control work, truly achieving on-demand function.

[0049] It is understood that the technical solution shown in this embodiment, after being controlled by the energy-saving control system, shortens the workpiece processing time by 10-30%, that is, improves production efficiency and capacity by 10-30%, saves 30-50% of electricity consumption, and protects the safety of operators and extends the service life of the equipment.

[0050] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

[0051] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

[0052] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations 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 any one or more embodiments or examples.

[0053] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A hydraulic press control system, characterized in that: include: PLC controller, frequency converter, multi-way pneumatic valve solenoid switch, multiple light sensors, start switch; Light sensors are arranged in front of and behind each hydraulic station, and are connected to the PLC controller. When the light sensors detect the presence of a workpiece in the hydraulic station, they send a detection signal to the PLC controller. The PLC controller is connected to the multi-way pneumatic valve solenoid switches respectively. When the PLC controller receives the detection signal, it controls the pneumatic valve solenoid switches of the corresponding hydraulic stations to open; The start switch is connected to the PLC controller, the PLC controller is connected to the frequency converter through a communication interface, and the frequency converter is connected to the motor. When the start switch is pressed, a start signal is sent to the PLC controller, so that when the PLC controller receives the start signal, it controls the frequency converter and then controls the motor to rotate at a preset frequency.

2. The hydraulic press control system according to claim 1, characterized in that: The number of the pneumatic valve electromagnetic switches is 3, and the number of the light sensors is 6.

3. The hydraulic press control system according to claim 2, characterized in that: The pneumatic valve electromagnetic switches are all connected to the pneumatic high-pressure ball valves of the hydraulic stations. When the pneumatic valve electromagnetic switches are turned on, the pneumatic high-pressure ball valves are controlled to open.

4. The hydraulic press control system according to claim 3, characterized in that: Also includes: A display screen is connected to the PLC controller.

5. The hydraulic press control system according to claim 4, characterized in that: Also includes: Fault display indicator light and operation display indicator light; The fault display indicator light and the operation display indicator light are both connected to the frequency converter.

6. The hydraulic press control system according to claim 5, characterized in that: The starting switch is a foot switch.

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