Electrical control cabinet for belt pumping unit

Abstract

The invention discloses an electrical control cabinet for a belt-type oil pump, comprising a programmable controller PLC and associated circuits, a power supply circuit for components inside the control cabinet, an emergency stop protection circuit for the oil pump and a temperature control system inside the control cabinet, wherein the programmable controller PLC is associated with a human-machine interaction interface, an RTU module circuit, a system start-stop control circuit, a load detection circuit, a speed detection circuit, a position detection circuit, an abnormal vibration protection circuit for the oil pump, a brake circuit, a lubrication pump control circuit and a main motor start-stop control circuit; the control cabinet can transmit data back to a production and operation background control center in real time in an area covered by a wireless network signal, so as to remotely monitor and control the oil pumping operation status; in an area not covered by a wireless network signal or when there is no signal, the control cabinet can independently detect and control the operation of the oil pump, and back up the actual operation data in real time for regular well patrol personnel to copy data, and can intelligently monitor the production and operation process of the oil pump to avoid the waste of electric energy due to the idle operation of the equipment.

Description

Technical Field

[0001] The invention belongs to the technical field of electric control cabinets, and more specifically, particularly relates to an electric control cabinet for a belt-type oil pumping unit. Background Art

[0002] The oil well production equipment system in oil fields is mainly composed of pumping units, drive systems (including pumping unit drive motors), and electrical control cabinets. The operation of the oil production equipment system is to control the operation of the drive system through the output of production process instructions from the electrical control cabinet, and to feedback the operating model from the drive unit to the control cabinet, so as to monitor the working status of the pumping unit.

[0003] With the development of digital information technology of the Internet of Things, there are many types of digital electrical control cabinets for oil pumping units at home and abroad, but their basic function is to output production process instructions to control the operation of the drive system, so that it can monitor and protect the operation status of the oil pumping unit and transmit real-time operation status and data to the background production operation management control center; but most oil wells are in remote and uninhabited areas in the mountains, and wireless data network signals are not covered, resulting in the digital Internet of Things function module being unable to transmit real-time data to the production operation background control center. In order to monitor the operating status of on-site equipment, it is necessary to increase the number of well patrols and increase the number of well patrols, which greatly increases the operation and maintenance costs.

[0004] There is a possibility that the electronic and electrical components in the control cabinet of the oil pumping unit may not work properly or may be damaged due to low temperature, thus affecting the normal safe production operation and efficiency of the oil pumping unit. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings in the prior art and to propose an electrical control cabinet for a belt-type oil pump.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] An electrical control cabinet for a belt-type oil pumping unit, including a programmable controller PLC and associated circuits, a power supply circuit for components inside the control cabinet, an emergency stop protection circuit for the oil pumping unit, and a temperature control system inside the control cabinet. The programmable controller PLC is associated with a human-machine interaction interface, an RTU module circuit, a system start-stop control circuit, a load detection circuit, a speed detection circuit, a position detection circuit, an abnormal vibration protection circuit for the oil pumping unit, a brake circuit, a lubrication pump control circuit, and a main motor start-stop control circuit;

[0008] The system start and stop control is provided by the three-position knob switch S1 to the programmable controller PLC, and then the programmable controller PLC outputs a signal to control the main motor start and stop relay MR to control the main motor of the pumping unit to stop, and at the same time, the brake relay LAR1 and the brake reset relay LAR2 are activated to drive the system brake device to operate;

[0009] The speed detection circuit converts the main motor speed into analog quantity through the speed detection sensor and sends it to the programmable control module, and then outputs the corresponding production process control instructions;

[0010] The position detection circuit converts the position of the oil pumping unit polished rod into analog quantity through the position sensor and sends it to the programmable control module, and then outputs the corresponding production process control instructions;

[0011] The abnormal vibration protection circuit of the oil pumping unit provides a signal to the programmable controller PLC through the emergency stop button S2, and then the programmable controller PLC outputs a signal to control the main motor start-stop relay MR to control the main motor of the oil pumping unit to stop, and at the same time, the brake relay LAR1 is activated to drive the system brake device to operate;

[0012] The temperature control system in the control cabinet includes a heat dissipation system and a heating system. The heat dissipation system includes a temperature control switch TH1, a fan 1F, a terminal TB, a heat dissipation fan operation indicator GL1 and a miniature circuit breaker MCB2. Pin 3 of the terminal TB is connected in parallel with pin 4 of the terminal TB. The fan 1F is connected in parallel with pin 3 of the terminal TB and pin 4 of the terminal TB. The fan 1F is connected to pin 19 of the terminal TB, and pin 19 of the terminal TB is grounded. The fan 1F and the heat dissipation fan operation indicator GL1 are both connected in parallel with pin 2 of the temperature control switch TH1, and pin 1 of the temperature control switch TH1 is connected in parallel with pin 2 of the miniature circuit breaker MCB2.

[0013] The heating system includes a temperature control switch TH2, a fan 2F, a heating device operation indicator light GL2 and a heater HE. The live wire L of the fan 2F is connected in parallel with the live wire L of the heater HE, the neutral wire N of the fan 2F is connected in parallel with the neutral wire N of the heater HE, the neutral wire N of the heater HE is connected in parallel with the pin TB3 of the wiring terminal and the pin TB4 of the wiring terminal, the fan 2F and the heating device operation indicator light GL2 are both connected in parallel with the pin 2 of the temperature control switch TH2, and the pin 1 of the temperature control switch TH2 is connected in parallel with the pin 2 of the miniature circuit breaker MCB2.

[0014] Preferably, the power supply circuit of the internal components of the control cabinet includes a wiring terminal TB, a 24V switching power supply PS, a miniature circuit breaker MCB1 and a miniature circuit breaker MCB3, the live wire L of the 24V switching power supply PS is connected to the output L1 of the programmable controller PLC, the neutral wire N of the 24V switching power supply PS is connected to the neutral wire N of the programmable controller PLC, the end point G of the 24V switching power supply PS is connected to the 10th pin of the wiring terminal TB, the 10th pin of the wiring terminal TB is grounded, and the 24V+ output terminal of the 24V switching power supply PS is connected to the 24V + input terminal is connected, the 24V- input terminal of the 24V switching power supply PS is connected to the 24V- output terminal of the human-machine interaction interface, the 55th pin of the wiring terminal TB is connected in parallel with the 56th pin of the wiring terminal TB, the 56th pin of the wiring terminal TB is connected to the 24V- negative pole of the 24V switching power supply PS, the 39th, 40th, 41st, 42nd, 43rd, 44th, 45th, 46th, 47th, 48th, 49th, 50th, 51st, 52nd, 53rd and 54th pins of the wiring terminals TB are connected in parallel, and the 52nd pin of the wiring terminal TB is connected to the 24V+ positive pole of the 24V switching power supply PS.

[0015] Pin 1 of the miniature circuit breakers MCB1, MCB2 and MCB3 are all connected in parallel with pin 1 of the wiring terminal TB, pin 2 of the miniature circuit breaker MCB1 is connected to the live wire L of the 24V switching power supply PS, pins 2, 3 and 4 of the wiring terminal TB are connected in parallel, pin 4 of the wiring terminal TB is connected to the neutral wire N of the 24V switching power supply PS, pin 2 of the miniature circuit breaker MCB2 is connected to the power supply of the temperature control system in the control cabinet, pin 2 of the miniature circuit breaker MCB3 is connected to the brake circuit, and pin 4 of the wiring terminal TB is connected to the lubrication pump control circuit and the brake circuit.

[0016] Preferably, the lubrication pump control circuit includes a lubrication oil pump, a lubrication pump start-stop relay OPR, an analog module EM, and a lubrication oil pressure sensor. The lubrication oil pump is connected to pin 4 of the wiring terminal TB, the lubrication oil pump is connected to pin 10 of the wiring terminal TB, and pin 10 of the wiring terminal TB is grounded. The lubrication oil pump is connected to pin 7 of the wiring terminal TB, and pin 7 of the wiring terminal TB is connected to pin 2 of the lubrication pump start-stop relay OPR, pin 1 of the lubrication pump start-stop relay OPR is connected to pin 2 of the miniature circuit breaker MCB2, pin 3 of the lubrication pump start-stop relay OPR is connected to the output terminal DQa.4 of the programmable controller PLC, pin 4 of the lubrication pump start-stop relay OPR is connected to pin 56 of the wiring terminal TB, the lubrication oil pressure sensor is connected to pins 37 and 38 of the wiring terminal TB, pins 37 and 38 of the wiring terminal TB are respectively connected to the L+ pin and 1+ pin of the output end of the analog module EM, the ground pin of the output end of the analog module EM is connected to pin 8 of the wiring terminal TB, and pin 8 of the wiring terminal TB is grounded.

[0017] Preferably, the braking circuit includes a braking relay LAR1, a braking reset relay LAR2 and a braking device, pin 5 of the braking relay LAR1 and pin 5 of the braking reset relay LAR2 are both connected to ends 2 of the miniature circuit breaker MCB3, pin 13 of the braking relay LAR1 and pin 13 of the braking reset relay LAR2 are respectively connected to output terminals DQa.6 and DQa.7 of the programmable controller PLC, pin 9 of the braking relay LAR1 and pin 9 of the braking reset relay LAR2 are both connected to the braking device, a braking device motor starting capacitor CAP is arranged between pin 9 of the braking relay LAR1 and pin 9 of the braking reset relay LAR2, and the braking device is connected to pin 3 of the wiring terminal TB.

[0018] Preferably, the main motor start-stop control circuit includes a main motor start-stop relay MR, and pins 1, 5, 9, and 14 of the main motor start-stop relay MR are respectively connected to pins 17, 18, 16, and 56 of the wiring terminal TB, and pin 13 of the main motor start-stop relay MR is connected to the output terminal DQa.5 of the programmable controller PLC.

[0019] Preferably, the speed detection circuit includes a speed detection sensor, the speed detection sensor is connected to pin 57 of the wiring terminal TB, and the pin 57 of the wiring terminal TB is connected to pin 0 of the input terminal DIa of the programmable controller PLC.

[0020] The position detection circuit includes a position detection sensor, which is connected to pin 58 of the wiring terminal TB, and pin 58 of the wiring terminal TB is connected to pin 1 of the input terminal DIa of the programmable controller PLC.

[0021] Preferably, the RTU module loop includes an RTU module and a wireless remote receiving antenna, the programmable controller PLC is connected to the RTU module via an RS485 port and a dedicated communication cable, and the RTU module is connected to the wireless remote receiving antenna.

[0022] Preferably, the system start-stop control circuit includes a three-position knob switch S1, which is connected to pins 59 and 60 of the wiring terminal TB, and pins 59 and 60 of the wiring terminal TB are respectively connected to pins 2 and 3 of the input terminal DIa of the programmable controller PLC;

[0023] The pumping unit emergency stop protection circuit includes an emergency stop button S2, which is connected to pins 61 and 50 of the wiring terminal TB, and pin 61 of the wiring terminal TB is connected to the pin of the input terminal DIa4 of the programmable controller PLC.

[0024] Preferably, the abnormal vibration protection circuit of the oil pumping unit includes a mechanical vibration switch and a programmable controller PLC. The mechanical vibration switch provides a signal to the programmable controller PLC, and then the programmable controller PLC outputs a signal to control the main motor start-stop relay MR to control the main motor of the oil pumping unit to stop, and at the same time, the brake relay LAR1 is activated to drive the system brake device to operate;

[0025] Preferably, the load detection circuit includes an analog module EM, a signal isolation module AM, and a wireless load signal receiving device, the L+ pin of the output end of the analog module EM is connected to the 1 pin of the signal isolation module AM, the 1 pin of the signal isolation module AM ​​is connected to the L+ pin of the output end of the programmable controller PLC, the M pin of the output end of the analog module EM is connected to the 1- pin of the analog module EM, the M pin of the output end of the analog module EM is connected to the 2 pin of the signal isolation module AM, and the 2 pin of the signal isolation module AM ​​is connected to the M pin of the output end of the programmable controller PLC;

[0026] The load signal receiving port of the wireless load signal receiving device is connected to the antenna, the +24VDC and -24VDC pins of the wireless load signal receiving device are respectively connected to pins 54 and 56 of the wiring terminal TB, the grounding PE pin of the wireless load signal receiving device is connected to pin 20 of the wiring terminal TB, the pin 20 of the wiring terminal TB is grounded, the load signal + pin and - pin of the wireless load signal receiving device are respectively connected to pins 35 and 36 of the wiring terminal TB, and the pins 35 and 36 of the wiring terminal TB are respectively connected to pins 3 and 4 of the signal quantity isolation module AM.

[0027] Technical effects and advantages of the present invention: Compared with the prior art, the electrical control cabinet for the belt-type oil pumping unit provided by the present invention has the following advantages:

[0028] 1. The control cabinet can be used as an independent sentinel to detect the operating status of the oil pump in real time. In areas covered by wireless network signals, the data can be transmitted back to the production and operation background control center in real time to remotely monitor and control the oil pumping operation status. In areas not covered by wireless network signals or when there is no signal, the control cabinet can independently detect and control the operation of the oil pump, and back up the actual operation data in real time for regular well patrol personnel to copy data.

[0029] 2. The control cabinet adopts a programmable controller with built-in production process instruction programs for several stroke oil pumps. It has high compatibility and interchangeability, which reduces the impact of equipment problems on production efficiency, especially customized parts generally have a longer cycle.

[0030] 3. The control cabinet can intelligently monitor the production and operation process of the oil pump. For example, after the underground crude oil is pumped out, the equipment can automatically judge to shut down, and then start again after the crude oil in the oil layer converges, avoiding the waste of electric energy when the equipment is running idle.

[0031] 4. The control cabinet has other functions such as motor overspeed protection, abnormal vibration protection of pumping unit frame, abnormal lubrication protection of pumping unit chain, etc., and a user-defined protection engineering interface is reserved.

[0032] Other features and advantages of the present invention will be described in the following description, and partly become obvious from the description, or be understood by implementing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a system architecture diagram of the electrical control cabinet for the oil pumping unit of the present invention;

[0034] Figure 2 An electrical diagram for power distribution in the cabinet of the present invention;

[0035] Figure 3 The electrical diagram for controlling the heat dissipation system, heating system and lubrication pump of the present invention;

[0036] Figure 4 It is the principle diagram of the programmable controller of the present invention;

[0037] Figure 5 The brake device and the main motor start-stop control circuit of the present invention;

[0038] Figure 6 It is a structural schematic diagram of the cabinet body door of the present invention;

[0039] Figure 7 It is a schematic structural diagram of the inner door of the cabinet of the present invention. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0041] See also Figure 1-7The present invention provides a technical solution: an electrical control cabinet for a belt-type oil pumping unit, including a programmable controller PLC and associated circuits, a power supply circuit for components inside the control cabinet, an emergency stop protection circuit for the oil pumping unit and a temperature control system inside the control cabinet, a programmable controller PLC associated human-machine interaction interface, an RTU module circuit, a system start-stop control circuit, a load detection circuit, a speed detection circuit, a position detection circuit, an abnormal vibration protection circuit for the oil pumping unit, a braking circuit, a lubrication pump control circuit and a main motor start-stop control circuit. It should be noted that the cabinet body of the electrical control cabinet adopts a double-layer isolation combined structure with an outer box door and an inner box door. The cabinet body adopts a double-layer design, and the inner box electrical component room and the outer box are independent of each other, and the overall protection level reaches IP54 or above;

[0042] The system start and stop control is provided by the three-position knob switch S1 to the programmable controller PLC, and then the programmable controller PLC outputs a signal to control the main motor start and stop relay MR to stop the main motor of the pumping unit, and at the same time, the brake relay LAR1 and the brake reset relay LAR2 are activated to drive the system brake device to operate;

[0043] The speed detection circuit converts the main motor speed into analog quantity through the speed detection sensor and sends it to the programmable control module, and then outputs the corresponding production process control instructions;

[0044] The position detection circuit converts the position of the pumping unit's polished rod into analog quantity through the position sensor and sends it to the programmable control module, and then outputs the corresponding production process control instructions;

[0045] The abnormal vibration protection circuit of the oil pumping unit provides a signal to the programmable controller PLC through the emergency stop button S2, and then the programmable controller PLC outputs a signal to control the main motor start-stop relay MR to control the main motor of the oil pumping unit to stop, and at the same time, the brake relay LAR1 is activated to drive the system brake device to operate;

[0046] The temperature control system in the control cabinet includes a heat dissipation system and a heating system. The heat dissipation system includes a temperature control switch TH1, a fan 1F, a terminal TB, a heat dissipation fan operation indicator GL1 and a miniature circuit breaker MCB2. Pin 3 of the terminal TB is connected in parallel with pin 4 of the terminal TB. The fan 1F is connected in parallel with pin 3 and pin 4 of the terminal TB. The fan 1F is connected to pin 19 of the terminal TB. Pin 19 of the terminal TB is grounded. The fan 1F and the heat dissipation fan operation indicator GL1 are both connected in parallel with pin 2 of the temperature control switch TH1. Pin 1 of the temperature control switch TH1 is connected in parallel with pin 2 of the miniature circuit breaker MCB2.

[0047] By setting up the heat dissipation system, the heat inside the electrical cabinet can be dissipated to prevent the temperature inside the electrical cabinet from being too high;

[0048] The heating system includes a temperature control switch TH2, a fan 2F, a heating device operation indicator light GL2 and a heater HE, a live wire L of the fan 2F is connected in parallel with a live wire L of the heater HE, a neutral wire N of the fan 2F is connected in parallel with a neutral wire N of the heater HE, a neutral wire N of the heater HE is connected in parallel with pin 3 of the wiring terminal and pin 4 of the wiring terminal, the fan 2F and the heating device operation indicator light GL2 are both connected in parallel with pin 2 of the temperature control switch TH2, and pin 1 of the temperature control switch TH2 is connected in parallel with pin 2 of the miniature circuit breaker MCB2;

[0049] By setting up the heating system, the electrical cabinet can be heated, so that the electrical cabinet can be suitable for -40℃-50℃ environment and can operate normally in low temperature and harsh environment;

[0050] The power supply circuit of the components inside the control cabinet includes the wiring terminal TB, the 24V switching power supply PS, the miniature circuit breaker MCB1 and the miniature circuit breaker MCB3. The live wire L of the 24V switching power supply PS is connected to the output L1 of the programmable controller PLC, the neutral wire N of the 24V switching power supply PS is connected to the neutral wire N of the programmable controller PLC, the terminal G of the 24V switching power supply PS is connected to the 10th pin of the wiring terminal TB, the 10th pin of the wiring terminal TB is grounded, and the 24V+ output terminal of the 24V switching power supply PS is connected to the 24V+ input terminal of the human-machine interface. The 24V- input terminal of the 24V switching power supply PS is connected to the 24V- output terminal of the human-machine interaction interface, the 55th pin of the wiring terminal TB is connected in parallel with the 56th pin of the wiring terminal TB, the 56th pin of the wiring terminal TB is connected to the 24V- negative pole of the 24V switching power supply PS, the 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53 and 54th pins of the wiring terminal TB are connected in parallel, and the 52th pin of the wiring terminal TB is connected to the 24V+ positive pole of the 24V switching power supply PS;

[0051] Pin 1 of miniature circuit breakers MCB1, MCB2 and MCB3 are all connected in parallel with pin 1 of terminal block TB, pin 2 of MCB1 is connected with live wire L of 24V switching power supply PS, pins 2, 3 and 4 of terminal block TB are connected in parallel, pin 4 of terminal block TB is connected with neutral wire N of 24V switching power supply PS, pin 2 of MCB2 is connected with power supply of temperature control system in control cabinet, pin 2 of MCB3 is connected with brake circuit, pin 4 of terminal block TB is connected with lubrication pump control circuit and brake circuit;

[0052] The lubrication pump control circuit includes a lubrication oil pump, a lubrication pump start-stop relay OPR, an analog module EM, and a lubrication oil pressure sensor. The lubrication oil pump is connected to pin 4 of the wiring terminal TB, the lubrication oil pump is connected to pin 10 of the wiring terminal TB, and pin 10 of the wiring terminal TB is grounded. The lubrication oil pump is connected to pin 7 of the wiring terminal TB, and pin 7 of the wiring terminal TB is connected to pin 2 of the lubrication pump start-stop relay OPR, pin 1 of the lubrication pump start-stop relay OPR is connected to pin 2 of the miniature circuit breaker MCB2, pin 3 of the lubrication pump start-stop relay OPR is connected to the output terminal DQa.4 of the programmable controller PLC, pin 4 of the lubrication pump start-stop relay OPR is connected to pin 56 of the wiring terminal TB, the lubrication oil pressure sensor is connected to pins 37 and 38 of the wiring terminal TB, pins 37 and 38 of the wiring terminal TB are respectively connected to the L+ pin and 1+ pin of the output terminal of the analog module EM, the ground pin of the output terminal of the analog module EM is connected to pin 8 of the wiring terminal TB, and pin 8 of the wiring terminal TB is grounded;

[0053] The brake circuit includes a brake relay LAR1, a brake reset relay LAR2 and a brake device. Pin 5 of the brake relay LAR1 and pin 5 of the brake reset relay LAR2 are both connected to the 2 ends of the miniature circuit breaker MCB3. Pin 13 of the brake relay LAR1 and pin 13 of the brake reset relay LAR2 are respectively connected to the output terminals DQa.6 and DQa.7 of the programmable controller PLC. Pin 9 of the brake relay LAR1 and pin 9 of the brake reset relay LAR2 are both connected to the brake device. A brake device motor starting capacitor CAP is provided between pin 9 of the brake relay LAR1 and pin 9 of the brake reset relay LAR2. The brake device is connected to pin 3 of the wiring terminal TB.

[0054] The main motor start-stop control circuit includes a main motor start-stop relay MR. Pins 1, 5, 9 and 14 of the main motor start-stop relay MR are respectively connected to pins 17, 18, 16 and 56 of the wiring terminal TB. Pin 13 of the main motor start-stop relay MR is connected to the output terminal DQa.5 of the programmable controller PLC.

[0055] The speed detection circuit includes a speed detection sensor, which is connected to the 57th pin of the wiring terminal TB, and the 57th pin of the wiring terminal TB is connected to the 0th pin of the input terminal DIa of the programmable controller PLC;

[0056] Through the setting of the speed detection loop, the speed of the main motor is converted into an analog quantity through the speed detection sensor and sent to the programmable control module, and then the corresponding production process control instructions are output;

[0057] The position detection circuit includes a position detection sensor, which is connected to the 58th pin of the wiring terminal TB, and the 58th pin of the wiring terminal TB is connected to the 1st pin of the input terminal DIa of the programmable controller PLC;

[0058] Through the setting of the position detection loop, the position sensor converts the position of the pumping unit's polished rod into an analog quantity and sends it to the programmable control module, which then outputs the corresponding production process control instructions;

[0059] The RTU module loop includes an RTU module and a wireless remote receiving antenna. The programmable controller PLC is connected to the RTU module through an RS485 port and a dedicated communication cable. The RTU module is connected to the wireless remote receiving antenna.

[0060] The system start-stop control circuit includes a three-position knob switch S1, which is connected to the 59th and 60th pins of the wiring terminal TB, and the 59th and 60th pins of the wiring terminal TB are respectively connected to the 2nd and 3rd pins of the input terminal DIa of the programmable controller PLC;

[0061] Through the setting of the system start-stop control circuit, the three-position knob switch S1 provides a signal to the programmable controller PLC, and then the programmable controller PLC outputs a signal to control the main motor start-stop relay MR to control the main motor of the pumping unit to stop, and at the same time, the brake relay LAR1 and the brake reset relay LAR2 are activated to drive the system brake device to operate;

[0062] The pumping unit emergency stop protection circuit includes an emergency stop button S2, which is connected to pins 61 and 50 of the wiring terminal TB, and pin 61 of the wiring terminal TB is connected to the pin of the input terminal DIa4 of the programmable controller PLC;

[0063] The abnormal vibration protection circuit of the oil pumping unit includes a mechanical vibration switch and a programmable controller PLC. The mechanical vibration switch provides a signal to the programmable controller PLC, and then the programmable controller PLC outputs a signal to control the main motor start-stop relay MR to stop the main motor of the oil pumping unit, and at the same time, the brake relay LAR1 is activated to drive the brake device of the system to operate;

[0064] Through the setting of the abnormal vibration protection circuit of the oil pump, the emergency stop button S2 provides a signal to the programmable controller PLC, and then the programmable controller PLC outputs a signal to control the main motor start-stop relay MR to stop the main motor of the oil pump, and at the same time, the brake relay LAR1 is activated to drive the brake device of the system to operate;

[0065] The load detection circuit includes an analog module EM, a signal isolation module AM, and a wireless load signal receiving device. The L+ pin of the output end of the analog module EM is connected to the 1 pin of the signal isolation module AM, the 1 pin of the signal isolation module AM ​​is connected to the L+ pin of the output end of the programmable controller PLC, the M pin of the output end of the analog module EM is connected to the 1- pin of the analog module EM, the M pin of the output end of the analog module EM is connected to the 2 pin of the signal isolation module AM, and the 2 pin of the signal isolation module AM ​​is connected to the M pin of the output end of the programmable controller PLC;

[0066] The load signal receiving port of the wireless load signal receiving device is connected to the antenna, the +24VDC and -24VDC pins of the wireless load signal receiving device are respectively connected to the 54th and 56th pins of the wiring terminal TB, the grounding PE pin of the wireless load signal receiving device is connected to the 20th pin of the wiring terminal TB, the 20th pin of the wiring terminal TB is grounded, the load signal +pin and -pin of the wireless load signal receiving device are respectively connected to the 35th and 36th pins of the wiring terminal TB, and the 35th and 36th pins of the wiring terminal TB are respectively connected to the 3rd and 4th pins of the signal quantity isolation module AM;

[0067] The programmable controller PLC is connected to the human-machine interface through the RJ45 interface, the output 1M pin of the programmable controller PLC is connected to the DC24V-pin of the 24V switching power supply PS, the output L1 pin of the programmable controller PLC is connected to the live wire L of the 24V switching power supply PS, the output neutral line of the programmable controller PLC is connected to the neutral line N of the 24V switching power supply PS, the ground of the programmable controller PLC is connected to the 10th pin of the wiring terminal TB, the 10th pin of the wiring terminal TB is grounded, the DQb output 0th pin and the 1st pin of the programmable controller PLC are respectively connected to the fault light RL and the warning light YL, the fault light RL and the warning light YL are both connected in parallel with the 56th pin of the wiring terminal TB, and the fault light RL and the warning light YL are both fixedly installed on the inner box door;

[0068] The DQa2L pin of the programmable controller PLC is connected to the DC24V+ pin of the 24V switching power supply PS, the DQa2L pin of the programmable controller PLC is connected to the DQa3L pin of the programmable controller PLC, the programmable controller PLC is connected to the 26, 27, and 28 pins of the wiring terminal TB through the RS485 interface and a dedicated communication cable, the 26 and 27 pins of the wiring terminal TB are both connected to the inverter communication module, and the 28 pin of the wiring terminal TB is connected to a shielding layer.

[0069] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. Belt-type oil pumping unit electrical control cabinet, characterized by: It includes a programmable controller PLC and associated circuits, a power supply circuit for components inside the control cabinet, an emergency stop protection circuit for the oil pumping unit and a temperature control system inside the control cabinet. The programmable controller PLC is associated with a human-machine interaction interface, an RTU module circuit, a system start-stop control circuit, a load detection circuit, a speed detection circuit, a position detection circuit, an abnormal vibration protection circuit for the oil pumping unit, a braking circuit, a lubrication pump control circuit and a main motor start-stop control circuit; The system start and stop control is provided by the three-position knob switch S1 to the programmable controller PLC, and then the programmable controller PLC outputs a signal to control the main motor start and stop relay MR to control the main motor of the pumping unit to stop, and at the same time, the brake relay LAR1 and the brake reset relay LAR2 are activated to drive the system brake device to operate; The speed detection circuit converts the main motor speed into analog quantity through the speed detection sensor and sends it to the programmable control module, and then outputs the corresponding production process control instructions; The position detection circuit converts the position of the oil pumping unit polished rod into analog quantity through the position sensor and sends it to the programmable control module, and then outputs the corresponding production process control instructions; The abnormal vibration protection circuit of the oil pumping unit provides a signal to the programmable controller PLC through the emergency stop button S2, and then the programmable controller PLC outputs a signal to control the main motor start-stop relay MR to control the main motor of the oil pumping unit to stop, and at the same time, the brake relay LAR1 is activated to drive the system brake device to operate; The temperature control system in the control cabinet includes a heat dissipation system and a heating system. The heat dissipation system includes a temperature control switch TH1, a fan 1F, a terminal TB, a heat dissipation fan operation indicator GL1 and a miniature circuit breaker MCB2. Pin 3 of the terminal TB is connected in parallel with pin 4 of the terminal TB. The fan 1F is connected in parallel with pin 3 of the terminal TB and pin 4 of the terminal TB. The fan 1F is connected to pin 19 of the terminal TB, and pin 19 of the terminal TB is grounded. The fan 1F and the heat dissipation fan operation indicator GL1 are both connected in parallel with pin 2 of the temperature control switch TH1, and pin 1 of the temperature control switch TH1 is connected in parallel with pin 2 of the miniature circuit breaker MCB2. The heating system includes a temperature control switch TH2, a fan 2F, a heating device operation indicator light GL2 and a heater HE. The live wire L of the fan 2F is connected in parallel with the live wire L of the heater HE, the neutral wire N of the fan 2F is connected in parallel with the neutral wire N of the heater HE, the neutral wire N of the heater HE is connected in parallel with the pin TB3 of the wiring terminal and the pin TB4 of the wiring terminal, the fan 2F and the heating device operation indicator light GL2 are both connected in parallel with the pin 2 of the temperature control switch TH2, and the pin 1 of the temperature control switch TH2 is connected in parallel with the pin 2 of the miniature circuit breaker MCB2.

2. The electrical control cabinet for the belt-type oil pump according to claim 1 is characterized in that: The power supply circuit of the internal components of the control cabinet includes a wiring terminal TB, a 24V switching power supply PS, a miniature circuit breaker MCB1 and a miniature circuit breaker MCB3. The live wire L of the 24V switching power supply PS is connected to the output L1 of the programmable controller PLC, the neutral wire N of the 24V switching power supply PS is connected to the neutral wire N of the programmable controller PLC, the end point G of the 24V switching power supply PS is connected to the 10th pin of the wiring terminal TB, the 10th pin of the wiring terminal TB is grounded, and the 24V+ output end of the 24V switching power supply PS is connected to the 24V+ input end of the human-machine interaction interface. The 24V input end of the 24V switching power supply PS is connected to the 24V output end of the human-machine interaction interface, the 55th pin of the wiring terminal TB is connected in parallel with the 56th pin of the wiring terminal TB, the 56th pin of the wiring terminal TB is connected to the 24V-negative pole of the 24V switching power supply PS, the 39th, 40th, 41st, 42nd, 43rd, 44th, 45th, 46th, 47th, 48th, 49th, 50th, 51st, 52nd, 53rd and 54th pins of the wiring terminals TB are connected in parallel, and the 52nd pin of the wiring terminal TB is connected to the 24V+positive pole of the 24V switching power supply PS; Pin 1 of the miniature circuit breakers MCB1, MCB2 and MCB3 are all connected in parallel with pin 1 of the wiring terminal TB, pin 2 of the miniature circuit breaker MCB1 is connected to the live wire L of the 24V switching power supply PS, pins 2, 3 and 4 of the wiring terminal TB are connected in parallel, pin 4 of the wiring terminal TB is connected to the neutral wire N of the 24V switching power supply PS, pin 2 of the miniature circuit breaker MCB2 is connected to the power supply of the temperature control system in the control cabinet, pin 2 of the miniature circuit breaker MCB3 is connected to the brake circuit, and pin 4 of the wiring terminal TB is connected to the lubrication pump control circuit and the brake circuit.

3. The electrical control cabinet for the belt-type oil pump according to claim 2 is characterized in that: The lubrication pump control circuit includes a lubrication oil pump, a lubrication pump start-stop relay OPR, an analog module EM, and a lubrication oil pressure sensor. The lubrication oil pump is connected to pin 4 of the wiring terminal TB, the lubrication oil pump is connected to pin 10 of the wiring terminal TB, and pin 10 of the wiring terminal TB is grounded. The lubrication oil pump is connected to pin 7 of the wiring terminal TB, and pin 7 of the wiring terminal TB is connected to pin 2 of the lubrication pump start-stop relay OPR, pin 1 of the lubrication pump start-stop relay OPR is connected to pin 2 of the miniature circuit breaker MCB2, pin 3 of the lubrication pump start-stop relay OPR is connected to the output terminal DQa.4 of the programmable controller PLC, pin 4 of the lubrication pump start-stop relay OPR is connected to pin 56 of the wiring terminal TB, the lubrication oil pressure sensor is connected to pins 37 and 38 of the wiring terminal TB, pins 37 and 38 of the wiring terminal TB are respectively connected to the L+ pin and 1+ pin of the output terminal of the analog module EM, the ground pin of the output terminal of the analog module EM is connected to pin 8 of the wiring terminal TB, and pin 8 of the wiring terminal TB is grounded.

4. The electrical control cabinet for the belt-type oil pumping unit according to claim 3 is characterized in that: The braking circuit includes a braking relay LAR1, a braking reset relay LAR2 and a braking device. Pin 5 of the braking relay LAR1 and pin 5 of the braking reset relay LAR2 are both connected to ends 2 of the miniature circuit breaker MCB3. Pin 13 of the braking relay LAR1 and pin 13 of the braking reset relay LAR2 are respectively connected to output terminals DQa.6 and DQa.7 of the programmable controller PLC. Pin 9 of the braking relay LAR1 and pin 9 of the braking reset relay LAR2 are both connected to the braking device. A braking device motor starting capacitor CAP is provided between pin 9 of the braking relay LAR1 and pin 9 of the braking reset relay LAR2. The braking device is connected to pin 3 of the wiring terminal TB.

5. The electrical control cabinet for the belt-type oil pumping unit according to claim 4 is characterized in that: The main motor start-stop control circuit includes a main motor start-stop relay MR, and pins 1, 5, 9, and 14 of the main motor start-stop relay MR are respectively connected to pins 17, 18, 16, and 56 of the wiring terminal TB, and pin 13 of the main motor start-stop relay MR is connected to the output terminal DQa.5 of the programmable controller PLC.

6. The electrical control cabinet for the belt-type oil pumping unit according to claim 1 is characterized in that: The speed detection circuit includes a speed detection sensor, which is connected to the 57th pin of the wiring terminal TB, and the 57th pin of the wiring terminal TB is connected to the 0th pin of the input terminal DIa of the programmable controller PLC; The position detection circuit includes a position detection sensor, which is connected to pin 58 of the wiring terminal TB, and pin 58 of the wiring terminal TB is connected to pin 1 of the input terminal DIa of the programmable controller PLC.

7. The electrical control cabinet for the belt-type oil pumping unit according to claim 1 is characterized in that: The RTU module loop includes an RTU module and a wireless remote receiving antenna. The programmable controller PLC is connected to the RTU module via an RS485 port and a dedicated communication cable. The RTU module is connected to the wireless remote receiving antenna.

8. The electrical control cabinet for the belt-type oil pumping unit according to claim 1 is characterized in that: The system start-stop control circuit includes a three-position knob switch S1, which is connected to the 59th and 60th pins of the wiring terminal TB, and the 59th and 60th pins of the wiring terminal TB are respectively connected to the 2nd and 3rd pins of the input terminal DIa of the programmable controller PLC; The pumping unit emergency stop protection circuit includes an emergency stop button S2, which is connected to pins 61 and 50 of the wiring terminal TB, and pin 61 of the wiring terminal TB is connected to the pin of the input terminal DIa4 of the programmable controller PLC.

9. The electrical control cabinet for the belt-type oil pumping unit according to claim 1, characterized in that: The abnormal vibration protection circuit of the oil pump includes a mechanical vibration switch and a programmable controller PLC. The mechanical vibration switch provides a signal to the programmable controller PLC, and then the programmable controller PLC outputs a signal to control the main motor start-stop relay MR to control the main motor of the oil pump to stop, and at the same time, the brake relay LAR1 is activated to drive the system brake device to operate.

10. The electrical control cabinet for the belt-type oil pumping unit according to claim 1, characterized in that: The load detection circuit includes an analog module EM, a signal isolation module AM, and a wireless load signal receiving device. The L+ pin of the output end of the analog module EM is connected to the 1 pin of the signal isolation module AM, the 1 pin of the signal isolation module AM ​​is connected to the L+ pin of the output end of the programmable controller PLC, the M pin of the output end of the analog module EM is connected to the 1- pin of the analog module EM, the M pin of the output end of the analog module EM is connected to the 2 pin of the signal isolation module AM, and the 2 pin of the signal isolation module AM ​​is connected to the M pin of the output end of the programmable controller PLC; The load signal receiving port of the wireless load signal receiving device is connected to the antenna, the +24VDC and -24VDC pins of the wireless load signal receiving device are respectively connected to pins 54 and 56 of the wiring terminal TB, the grounding PE pin of the wireless load signal receiving device is connected to pin 20 of the wiring terminal TB, the pin 20 of the wiring terminal TB is grounded, the load signal + pin and - pin of the wireless load signal receiving device are respectively connected to pins 35 and 36 of the wiring terminal TB, and the pins 35 and 36 of the wiring terminal TB are respectively connected to pins 3 and 4 of the signal quantity isolation module AM.

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