Automatic control device for oil cylinder detection

Abstract

The utility model discloses an automatic control device for oil cylinder detection, which is electrically connected with a hydraulic station, and an oil outlet of the hydraulic station is communicated with an oil supply port of an oil cylinder through an oil way. The control device comprises a central controller, a power supply unit, a displacement sensor, a hydraulic sensor, an oil supply control circuit electrically connected with a first control end of the hydraulic station, and an oil return control circuit electrically connected with a second control end of the hydraulic station; the bus between the oil supply control circuit and the first control end of the hydraulic station is connected in series with a current detection sensor, and the bus between the second control end of the hydraulic station and the oil return control circuit is connected in parallel with a voltage detection network. According to the utility model, the working process of the oil cylinder of the hydraulic station can be automatically detected, and hydraulic data and oil cylinder stroke data acquired in the detection process of the oil cylinder can be stored.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil cylinder detection, and specifically relates to an automatic control device for oil cylinder detection. Background Art

[0002] The oil cylinder is a key component of hydraulic equipment. It is connected to the hydraulic system through oil pipes and provides a power device for the opening and closing of the hardtop. The main task of the oil cylinder detection is to ensure that the oil cylinder is well sealed and the stroke is in place. The oil cylinder detection is an indispensable step in the work links such as the oil cylinder factory inspection and regular maintenance of hydraulic equipment. At present, the oil cylinder is mainly tested by manual testing. The oil cylinder detection process is mainly divided into four steps: oil filling, pressure maintenance, reading hydraulic values, and oil discharge. At present, the automation level of oil cylinder detection is not high. It is necessary to manually control the hydraulic station to fill the oil cylinder with oil, and then let the oil cylinder maintain pressure. After reaching the specified pressure maintenance time, manually read the value of the hydraulic gauge, and finally control the hydraulic station to drain the oil from the cylinder to end the detection. Manual inspection requires relevant skills to operate the oil cylinder inspection equipment. Due to the large weight and volume of existing oil cylinder inspection equipment and high cost, the poor accuracy of manual inspection and low degree of automation, it is difficult to implement inspections on various items of the oil cylinder, which can easily lead to misjudgment and low inspection efficiency, which seriously affects the inspection results. Therefore, it is necessary to develop an oil cylinder inspection automatic control equipment to solve the above-mentioned problems existing in the prior art, and to save the hydraulic data and oil cylinder piston stroke data collected during the inspection process. Utility Model Content

[0003] The purpose of the utility model is to provide an automatic control device for oil cylinder detection. According to the utility model, the working process of the oil cylinder of the hydraulic station can be automatically detected, and the hydraulic data and oil cylinder stroke data collected during the oil cylinder detection process can be saved. In order to achieve the above purpose, the utility model adopts the following technical effects:

[0004] According to one aspect of the utility model, the utility model provides an automatic control device for oil cylinder detection, the control device is electrically connected to a hydraulic station, the oil outlet of the hydraulic station is connected to the oil supply port of the oil cylinder through an oil circuit, the control device includes a central controller, a power supply unit, a displacement sensor, a hydraulic sensor, and an oil supply control circuit electrically connected to a first control end of the hydraulic station, and an oil return control circuit electrically connected to a second control end of the hydraulic station, a current detection sensor is connected in series on a busbar between the oil supply control circuit and the first control end of the hydraulic station, a voltage detection network is connected in parallel on a busbar between the second control end of the hydraulic station and the oil return control circuit, the power supply end of the oil supply control circuit, the power supply end of the oil return control circuit, and the power supply end of the voltage detection network are electrically connected to the power supply output end of the power supply unit, respectively, the voltage collection output end of the voltage detection network and the current collection output end of the current detection sensor are electrically connected to the central controller, and the collection output end of the displacement sensor, the collection output end of the hydraulic sensor, the control end of the oil supply control circuit, and the control end of the oil return control circuit are electrically connected to the central controller, respectively.

[0005] The above scheme is further preferred, wherein the voltage detection network includes a resistor divider network, a linear optocoupler isolator U1 and an operational amplifier U2, wherein one end of the resistor divider network is connected to the busbar between the second control terminal of the hydraulic station and the oil return control circuit, and the other end of the resistor divider network is connected to the input end of the linear optocoupler isolator U1, and the positive output end of the linear optocoupler isolator U1 is connected to the positive input end of the operational amplifier U2 through a resistor R1, and a resistor R3 and a capacitor C1 are connected in parallel to the ground at the positive input end of the operational amplifier U2, and the negative output end of the linear optocoupler isolator U1 is connected to the negative input end of the operational amplifier U2 through a resistor R2, and the output end of the operational amplifier U2 is respectively connected to one end of a resistor R4, one end of a capacitor C2, and an acquisition input end of a central controller, and the other end of the resistor R4 and the other end of the capacitor C2 are respectively connected to the negative input end of the operational amplifier U2.

[0006] The above scheme is further preferred, that the resistor voltage divider network includes a resistor R01, a resistor R02, and a resistor R03, one end of the resistor R01 and the resistor R02 being connected in series is connected to the busbar between the second control end of the hydraulic station and the oil return control circuit, and the other end of the resistor R01 and the resistor R02 being connected in series is respectively connected to one end of the resistor R03 and the input end of the linear optocoupler isolator U1.

[0007] The above scheme is further preferred, wherein the control device also includes a TTL serial port gateway connected to the host computer for communication, the UART1 interface of the central controller is connected to the host computer for communication via the TTL serial port gateway, and the UART2 interface of the central controller is connected to the displacement sensor and the hydraulic sensor via corresponding RS485 controllers.

[0008] The above scheme is further preferred, in which a three-way valve is arranged on the oil circuit near the oil outlet of the hydraulic station, the oil inlet of the three-way valve is connected to the oil outlet of the hydraulic station, the hydraulic sensor is arranged in the three-way valve, and a liquid level sensor is arranged in the oil storage chamber of the hydraulic station, and the hydraulic sensor is connected to the collection input end of the central controller through the corresponding RS485 controller.

[0009] The above scheme is further preferred, wherein the oil supply control circuit includes an oil supply control relay J1 and an oil supply driver, the first control output end of the central controller is connected to the input end of the oil supply driver, the drive output end of the oil supply driver is electrically connected to the forward end of the bidirectional motor of the hydraulic station 1 through the oil supply control relay J1, and the oil return control circuit includes an oil return control relay J2 and an oil return driver, the second control output end of the central controller is connected to the input end of the oil return driver, and the drive output end of the oil return driver is electrically connected to the reverse end of the bidirectional motor of the hydraulic station 1 through the oil return control relay J2.

[0010] The above scheme is further preferred, wherein the central controller is a DSP processor, an FPGA processor or a single-chip microcomputer controller, and the oil supply driver and the oil return driver are N-MOS tube drivers.

[0011] To sum up, since the utility model adopts the above-mentioned technical scheme, the utility model has the following technical effects: the automatic control device of the utility model can automatically detect the working process of the cylinder of the hydraulic station, and can save the hydraulic data and cylinder stroke data collected during the cylinder detection process. The degree of automation of the control device is relatively high, and it can complete the detection of cylinder-related items. The detection process is relatively simple, the detection efficiency is high, and the performance is stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a control principle diagram of a utility model oil cylinder detection automatic control device;

[0013] Figure 2 It is a circuit schematic diagram of a voltage detection network and an oil supply control circuit of a utility model;

[0014] In the accompanying drawings, there are a hydraulic station 1 , an oil cylinder 2 , a central controller 10 , a power supply unit 11 , an oil supply control circuit 12 , a displacement sensor 13 , a hydraulic sensor 14 , a three-way valve 15 , and a voltage detection network 130 . DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below with reference to the accompanying drawings and preferred embodiments. However, it should be noted that many details listed in the specification are only for the purpose of enabling readers to have a thorough understanding of one or more aspects of the utility model, and these aspects of the utility model can be realized even without these specific details.

[0016] like Figure 1As shown, according to an oil cylinder detection automatic control device provided by the utility model, the control device is electrically connected to the hydraulic station 1, the oil outlet of the hydraulic station 1 is connected to the oil supply port of the oil cylinder 2 through the oil circuit, the control device includes a central controller 10, a power supply unit 11, a displacement sensor 13, a hydraulic sensor 14, and an oil supply control circuit 12 electrically connected to the first control end of the hydraulic station 1, and an oil return control circuit 13 electrically connected to the second control end of the hydraulic station 1, and a current detection sensor 120 is connected in series on the busbar between the oil supply control circuit 12 and the first control end of the hydraulic station 1. A voltage detection network 130 is connected in parallel on the busbar between the second control end of the hydraulic station 1 and the oil return control circuit 13. The power supply end of the oil supply control circuit 12, the power supply end of the oil return control circuit 13, and the power supply end of the voltage detection network 130 are electrically connected to the power supply output end of the power supply unit 11, respectively. The voltage collection output end of the voltage detection network 130 and the current collection output end of the current detection sensor 120 are electrically connected to the central controller 10, respectively. The collection output end of the displacement sensor, the collection output end of the hydraulic sensor, and the control end of the oil supply control circuit 12 are electrically connected to the central controller 10. The control end of the oil return control circuit 13 is electrically connected to the central controller 10 respectively; the control device also includes a TTL serial port gateway connected to the host computer, the UART1 interface of the central controller 10 is connected to the host computer through the TTL serial port gateway, and the UART2 interface of the central controller is connected to the displacement sensor and the hydraulic sensor through the corresponding RS485 controller. In the utility model, the central controller 10 is a DSP processor, an FPGA processor or a single-chip microcomputer controller, wherein the single-chip microcomputer controller preferably adopts the model STC8H8 K64U, the model of the TTL serial port gateway is USR-TCP232-T2. In the present utility model, a liquid level sensor 14 is provided in the oil storage chamber of the hydraulic station 1. The liquid level sensor is connected to the acquisition input end of the central controller 10 through the corresponding RS485 controller. The liquid level sensor 14 is used to detect the liquid level of the hydraulic oil contained in the hydraulic station 1. A three-way valve 15 is provided on the oil circuit near the oil outlet of the hydraulic station 1. The oil inlet of the three-way valve 15 is connected to the oil outlet of the hydraulic station 1. The oil inlet of the three-way valve 15 is connected to the oil outlet of the hydraulic station 1. The hydraulic sensor 14 is provided in the three-way valve 15.The UART1 interface of the central controller 10 is connected to the TTL serial port gateway, thereby realizing the conversion from the serial port to Ethernet, and is used for the interconnection between the central controller 10 and the host computer, so that the host computers can communicate through Ethernet, realize the transmission of control instructions and the collected hydraulic pressure, stroke and other data between the host computer and the central controller 10, and save the data. The hydraulic sensor 14 is used to collect the oil pressure in the oil delivery pipe of the return oil control circuit 13, and the displacement sensor 13 is used to detect the extension length (stroke) of the piston rod of the oil cylinder 2. The UART2 interface of the central controller 10 is connected to the RS485 controller. The RS485 interface is interconnected with each sensor through the RS485 controller, and then the conversion from TTL level to RS485 level is realized. The interface of the central controller 10 collects the data of each sensor so that the hydraulic sensor, displacement sensor, etc. can transmit data. According to the collected data, the central controller 10 controls the oil supply and return of the hydraulic station 1 through the oil supply control circuit 12 and the oil return control circuit 13. The power supply unit 11 outputs three different DC power supplies: DC 24V, DC +5V, and DC -5V, which provide working power for the central controller 10, relays, and external sensors. ;

[0017] like Figure 1 and Figure 2As shown, the oil supply control circuit 12 includes an oil supply control relay J1 and an oil supply driver. The first control output end of the central controller 10 is connected to the input end of the oil supply driver, and the drive output end of the oil supply driver is electrically connected to the positive end of the bidirectional motor of the hydraulic station 1 through the oil supply control relay J1; the oil return control circuit 13 includes an oil return control relay J2 and an oil return driver. The second control output end of the central controller 10 is connected to the input end of the oil return driver, and the drive output end of the oil return driver is electrically connected to the reverse end of the bidirectional motor of the hydraulic station 1 through the oil return control relay J2. The oil supply driver and the oil return driver adopt N-MOS tube drivers, and the oil supply control relay The models of the relay J1 (oil filling circuit relay of the oil cylinder) and the oil return control relay J2 (oil discharge circuit relay) are both HFE80V-40 / 450-24-HTPAJ; when supplying oil, the central controller 10 outputs a control signal to turn on the gate of the N-MOS tube driver Q1 and drive the oil supply control relay J1 to be energized and closed, and the power supply VDD output by the power supply unit 11 is connected to the positive end of the bidirectional motor of the hydraulic station 1. After being energized, the bidirectional motor of the hydraulic station 1 rotates forward, and the axial piston pump of the hydraulic station is driven to rotate forward by the bidirectional motor, and the hydraulic oil in the hydraulic station is transported to the oil cylinder 2 through the oil pipe, so that the piston rod of the oil cylinder 2 extends, and the displacement sensor 13 detects the extension of the piston rod of the oil cylinder 2. The process is carried out and maintained for a period of time. After the hydraulic sensor detects that the oil pressure in the oil pipe reaches the preset value, the central controller 10 outputs a control signal to turn off the gate of the N-MOS tube driver Q1, driving the oil supply control relay J1 to lose power; thereafter, the central controller 10 outputs a control signal to turn on the gate of the N-MOS tube driver Q2, driving the oil supply control relay J2 to be energized and closed, and the power supply VDD output by the power supply unit 11 is connected to the reverse end of the bidirectional motor of the hydraulic station 1. The bidirectional motor of the hydraulic station 1 rotates in the reverse direction after being energized, and the axial piston pump of the hydraulic station 1 is driven to rotate in the reverse direction through the bidirectional motor, so that the hydraulic oil in the cylinder 2 flows back to the hydraulic station 1 through the oil pipe, so that the piston rod of the cylinder 2 contracts, and the displacement sensor After 13 detects the piston rod contraction stroke of the oil cylinder 2 and keeps it stable for a period of time, the hydraulic sensor 13 detects the oil pressure in the oil pipe, and the central controller 10 outputs a control signal to cut off the gate of the N-MOS tube driver Q2, driving the oil supply control relay J2 to lose power, and the bidirectional motor of the hydraulic station 1 also loses power and stops running; thereby, circulating oil supply and return oil control are carried out, and two IO ports are selected on the central controller 10, and two relays are controlled respectively by two N-MOS tubes. When the oil cylinder filling circuit relay is sucked up, the hydraulic station fills the oil cylinder with oil; when the oil cylinder discharge circuit relay is sucked up, the hydraulic station drives the oil cylinder to discharge oil. When both relays are in the dropped state, the oil cylinder maintains pressure, thereby achieving the purpose of detecting automatic control of the oil cylinder.

[0018] In the present utility model, if Figure 1 and Figure 2 As shown, the voltage detection network 130 includes a resistor voltage divider network, a linear optocoupler isolator U1 and an operational amplifier U2. One end of the resistor voltage divider network is connected to the bus between the second control terminal of the hydraulic station 1 and the oil return control circuit 13. The other end of the resistor voltage divider network is connected to the input end of the linear optocoupler isolator U1. The positive output end of the linear optocoupler isolator U1 is connected to the positive input end of the operational amplifier U2 through a resistor R1. A resistor R3 and a capacitor C1 are connected in parallel to the positive input end of the operational amplifier U2. The negative output end of the linear optocoupler isolator U1 is connected to the negative input end of the operational amplifier U2 through a resistor R2. The output end of the operational amplifier U2 is connected to the resistor R4. The resistor R01 and the resistor R02 are connected to one end of the hydraulic station 1, one end of the capacitor C2, and the collection input end of the central controller 10, and the other end of the resistor R4 and the other end of the capacitor C2 are respectively connected to the negative input end of the operational amplifier U2; the resistor voltage divider network includes resistors R01, R02, and R03, and one end of the resistor R01 connected in series with the resistor R02 is connected to the bus between the second control end of the hydraulic station 1 and the return oil control circuit 13, and the other end of the resistor R01 connected in series with the resistor R02 is respectively connected to one end of the resistor R03 and the input end of the linear optocoupler isolator U1. The model of the current detection sensor 120 of the hydraulic station 1 is MT9223CT-30BR5, and the model of the linear optocoupler isolator U1 is ACPL-C87 A. The operational amplifier U2 model is SGM8551XN. In order to collect the current of the hydraulic station 1 when it is working, a current detection sensor 120 is connected in series in the power supply circuit of the hydraulic station, and the collected data is converted into analog to digital through the ADC pin of the central controller 10. In order to collect the voltage of the hydraulic station 1 when it is working, a voltage detection network 130 composed of a resistor voltage divider network and a linear optocoupler isolator U1 is used, and the collected data is converted into analog to digital through another ADC pin of the central controller 10, so as to avoid excessive current when the hydraulic station 1 is working. By detecting and comparing whether the voltage is too large during operation, the load of the hydraulic station is avoided; the upper computer sends relevant instructions to the central controller 10 through the Ethernet channel. The pressure holding time and the number of repeated tests set by the user are sent to the central controller 10, and the central controller 10 then automatically controls the entire process of the cylinder test according to the preset pressure holding time and the number of tests, and transmits the hydraulic pressure, cylinder piston stroke, working voltage and current of the hydraulic station 1 and other data collected during the test to the host computer. When the cylinder test is finished, the host computer sends an end instruction to the central controller 11. After receiving the relevant end instruction, the central controller 11 will control the drive cylinder to release the oil and end the test; when some emergencies occur during the test and the user needs to urgently stop the power supply of the hydraulic station, the host computer sends an emergency stop instruction, and the central controller 11 will disconnect the oil supply control circuit 12 of the hydraulic station 1 after receiving the relevant instruction.

[0019] The above is only a preferred embodiment of the utility model. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model. These improvements and modifications should also be regarded as the scope of protection of the utility model.

Claims

1. An automatic control device for oil cylinder detection, wherein the control device is electrically connected to a hydraulic station, and the oil outlet of the hydraulic station is connected to the oil supply port of the oil cylinder through an oil circuit, characterized in that: The control device includes a central controller, a power supply unit, a displacement sensor, a hydraulic sensor, an oil supply control circuit electrically connected to the first control end of the hydraulic station, and an oil return control circuit electrically connected to the second control end of the hydraulic station. A current detection sensor is connected in series on the busbar between the oil supply control circuit and the first control end of the hydraulic station, and a voltage detection network is connected in parallel on the busbar between the second control end of the hydraulic station and the oil return control circuit. The power supply end of the oil supply control circuit, the power supply end of the oil return control circuit, and the power supply end of the voltage detection network are electrically connected to the power supply output end of the power supply unit, respectively. The voltage collection output end of the voltage detection network and the current collection output end of the current detection sensor are electrically connected to the central controller, and the collection output end of the displacement sensor, the collection output end of the hydraulic sensor, the control end of the oil supply control circuit, and the control end of the oil return control circuit are electrically connected to the central controller, respectively.

2. The oil cylinder detection automatic control device according to claim 1, characterized in that: The voltage detection network includes a resistor divider network, a linear optocoupler isolator U1 and an operational amplifier U2. One end of the resistor divider network is connected to the busbar between the second control terminal of the hydraulic station and the oil return control circuit, and the other end of the resistor divider network is connected to the input end of the linear optocoupler isolator U1. The positive output end of the linear optocoupler isolator U1 is connected to the positive input end of the operational amplifier U2 through a resistor R1. A resistor R3 and a capacitor C1 are connected in parallel to the ground at the positive input end of the operational amplifier U2. The negative output end of the linear optocoupler isolator U1 is connected to the negative input end of the operational amplifier U2 through a resistor R2. The output end of the operational amplifier U2 is respectively connected to one end of a resistor R4, one end of a capacitor C2, and an acquisition input end of a central controller, and the other end of the resistor R4 and the other end of the capacitor C2 are respectively connected to the negative input end of the operational amplifier U2.

3. The oil cylinder detection automatic control device according to claim 2, characterized in that: The resistor voltage divider network includes resistor R01, resistor R02, and resistor R03. One end of the resistor R01 and resistor R02 connected in series is connected to the bus between the second control end of the hydraulic station and the oil return control circuit, and the other end of the resistor R01 and resistor R02 connected in series is respectively connected to one end of the resistor R03 and the input end of the linear optocoupler isolator U1.

4. An automatic control device for oil cylinder detection according to claim 1 or 2, characterized in that: The control device also includes a TTL serial port gateway connected to the host computer for communication. The UART1 interface of the central controller is connected to the host computer for communication via the TTL serial port gateway. The UART2 interface of the central controller is connected to the displacement sensor and the hydraulic sensor via corresponding RS485 controllers.

5. The oil cylinder detection automatic control device according to claim 4, characterized in that: A three-way valve is arranged on the oil circuit near the oil outlet of the hydraulic station, the oil inlet of the three-way valve is connected with the oil outlet of the hydraulic station, the hydraulic sensor is arranged in the three-way valve, and a liquid level sensor is arranged in the oil storage chamber of the hydraulic station. The hydraulic sensor is connected to the collection input end of the central controller through the corresponding RS485 controller.

6. The oil cylinder detection automatic control device according to claim 1, characterized in that: The oil supply control circuit includes an oil supply control relay J1 and an oil supply driver. The first control output end of the central controller is connected to the input end of the oil supply driver. The drive output end of the oil supply driver is electrically connected to the forward end of the bidirectional motor of the hydraulic station through the oil supply control relay J1. The oil return control circuit includes an oil return control relay J2 and an oil return driver. The second control output end of the central controller is connected to the input end of the oil return driver. The drive output end of the oil return driver is electrically connected to the reverse end of the bidirectional motor of the hydraulic station through the oil return control relay J2.

7. An automatic control device for oil cylinder detection according to claim 5 or 6, characterized in that: The central controller is a DSP processor, an FPGA processor or a single-chip microcomputer controller, and the oil supply driver and the oil return driver adopt N-MOS tube drivers.

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