Quick power-off device for pumping unit belt slip and pumping unit

Abstract

The utility model relates to oilfield pumping unit oil production auxiliary equipment technical field discloses pumping unit belt slip quick cut -off power device and pumping unit. Because the size of big pulley, small pulley and belt is known, under the condition that motor speed is also known and belt does not slip, the speed of big pulley can be calculated. Through real -time detection sensor assembly detects the speed of big pulley, and compares with the calculated speed of big pulley, to judge whether the belt slips. When the real -time speed of big pulley detected by sensor is lower than the set value, cut off the power of pumping unit motor. Before the belt slip burns and breaks in rainy day, cut off the power in the first time, avoid the risk that belt burns ignites oil well, in addition, also reduced the damage of belt, obviously improved the service life of belt, effectively reduced the times of oil production worker to replace the belt in rainy and snowy weather, reduced the labor intensity of worker, reduced the cost consumption, greatly promoted oil well oil production time rate.

Description

Technical Field

[0001] This utility model relates to the technical field of oilfield pumping unit auxiliary equipment, specifically to a pumping unit belt slippage quick power cut-off device and a pumping unit. Background Technology

[0002] Currently, belt drive is the main method of power transmission for oil pumping units on the ground. Because oil pumping units are exposed to the elements for extended periods, the belts often slip and spin idly after a short period of use, directly affecting the normal operation of the pumping unit and preventing normal oil well production. This poses significant challenges to oil well management and oilfield production. With the continuous improvement of oil production information systems, Production Control Systems (PCS) have been widely used in production, greatly improving oil well production efficiency. Currently, the central control room of the production command center mainly uses the PCS system and security video surveillance to analyze whether oil wells are producing normally. However, the existing PCS system cannot accurately and timely predict the problem of belt slippage and burnout during rainy weather, mainly in the following three aspects: 1. When the conveyor belt slips in rainy weather, the large pulley of the pumping unit will first stop, and smoke will typically appear on the belt after 20 seconds. This process can continue for 2-4 minutes until the belt completely burns out. If the pumping unit is leaking oil at this time, there is a high probability that the entire oil well will ignite. Furthermore, the motor will continue to run, and due to the short time frame, the pre-installed safety system (PCS) cannot detect the entire process in time. Manual intervention is insufficient to handle the situation promptly, and the burning of the belt also causes significant damage to the pulley.

[0003] 2. The on-site dynamometer chart is set to update every half hour. The control room typically analyzes changes in load on the dynamometer chart to determine if the well belt has broken. However, due to the limitation of information lag in the PCS (Pressure Monitoring System), by the time the breakage is detected, the belt has already burned out. The control room can only remotely shut down the well and then arrange for personnel to replace it, resulting in a shorter belt lifespan, higher wear and tear, and longer well shutdown time during rainy weather.

[0004] 3. The PCS system mainly determines whether the conveyor belt has broken by analyzing the fluctuation of the current. For oil wells equipped with intelligent oil production devices or those with manual information push, it is easy to cause false alarms in the combined early warning. Utility Model Content

[0005] To address the aforementioned deficiencies in existing technologies, a device for quickly cutting off power in case of belt slippage in oil pumping units is provided. This device promptly cuts off the motor power supply upon detecting a belt malfunction, thus preventing accidents.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: A device for quickly cutting off power when the pumping unit belt slips, wherein the pumping unit belt connects a large pulley and a small pulley, and the small pulley is driven by a motor; characterized in that: it includes a sensor assembly for detecting the rotational speed of the large pulley, an existing controller for receiving signals from the sensor assembly, and a power supply, all electrically connected to each other; the sensor assembly consists of a reflector and a sensor, the sensor being mounted on a bracket near the large pulley, and the reflector being mounted on the large pulley, with their positions matched; the existing controller is connected to the motor of the pumping unit and has the function of cutting off power.

[0007] According to the above technical solution, the sensor adopts an infrared reflective proximity switch, and a mounting bracket is provided on the oil pumping unit. The proximity switch is set in a position that matches the reflective part through the mounting bracket.

[0008] According to the above technical solution, the reflective part is made of patch or magnet, and the reflective part is fixed on the wheel of the large pulley.

[0009] According to the above technical solution, a timer is installed inside the controller.

[0010] According to the above technical solution, the existing controller is connected to an external PCS alarm system.

[0011] According to the above technical solution, a 12V power supply is used.

[0012] According to the above technical solution, the sensor assembly and the existing controller use the same power supply, and the power supply is connected to both the sensor assembly and the existing controller via wires.

[0013] According to the above technical solution, the sensor assembly and the existing controller each use a power supply. The sensor assembly is equipped with a solar power supply, and the sensor and the controller communicate with each other via wireless signals. The power supply of the existing controller is located within the existing controller.

[0014] An oil pumping unit, characterized in that it includes a quick power cut-off device for belt slippage as described above. This invention has the following advantages: Since the dimensions of the large pulley, small pulley, and belt are known, and assuming the motor speed is also known and the belt does not slip, the speed of the large pulley can be calculated; this is referred to as the setpoint of the large pulley. The speed of the large pulley is detected in real time by a sensor assembly and compared with the setpoint to determine if belt slippage has occurred. When the real-time speed of the large pulley detected by the sensor is lower than the setpoint, the power supply to the pumping unit motor is cut off. Based on this measure, the power can be cut off immediately if the belt slips and burns out in rainy weather, avoiding the risk of the belt igniting the oil well. Furthermore, it reduces belt damage, significantly extends belt life, effectively reduces the frequency of belt replacement by oil production workers in rainy or snowy weather, reduces worker labor intensity, reduces costs, and greatly improves the oil well's production rate. Attached Figure Description

[0015] Figure 1 This is a structural schematic diagram of an embodiment provided by this utility model; In the diagram, 1. belt; 2. large pulley; 3. small pulley; 4. motor; 5. sensor assembly; 6. controller; 7. power supply. Detailed Implementation

[0016] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0017] Reference Figure 1 As shown, this utility model provides a quick power cut-off device for oil pump belt slippage.

[0018] Example 1 The pumping unit belt 1 connects a large pulley 2 and a small pulley 3, with the small pulley driven by a motor 4. The system includes a sensor assembly 5 electrically connected to each other for detecting the rotational speed of the large pulley, an existing controller 6 that receives signals from the sensor assembly, and a power supply 7. The sensor assembly consists of a reflector and a sensor; the sensor is mounted on a bracket near the large pulley, and the reflector is mounted on the large pulley, with their positions matched. The existing controller is connected to the pumping unit motor and has the function of cutting off the power supply. In this embodiment, since the dimensions of the large pulley, small pulley, and belt are known, and assuming the motor speed is also known and the belt does not slip, the speed of the large pulley can be calculated; this is referred to as the set value of the large pulley. The speed of the large pulley is detected in real time by a sensor assembly and compared with the set value to determine if belt slippage has occurred. When the real-time speed of the large pulley detected by the sensor is lower than the set value, the power supply to the pumping unit motor is cut off. Based on this measure, the power can be cut off immediately if the belt slips and burns out in rainy weather, avoiding the risk of the belt igniting the oil well. Furthermore, it reduces belt damage, significantly increases belt lifespan, effectively reduces the frequency of belt replacement by oil workers in rainy or snowy weather, reduces worker labor intensity, reduces costs, and greatly improves the oil well's production rate.

[0019] In some embodiments, the sensor is an infrared reflective proximity switch, and a mounting bracket is provided on the pumping unit to position the proximity switch in a position that matches the reflector.

[0020] In some embodiments, the reflective part is a patch or a magnet, and the reflective part is fixed to the wheel sprocket of the large pulley.

[0021] In some embodiments, a timer is provided within the controller.

[0022] In this embodiment, since the rotational speed of the large pulley can be calculated, the rated time for one revolution of the large pulley can also be calculated. The interval between the signals reflected by the reflective parts on both sides of the sensor is calculated, and by comparing the interval with the rated time, it can be determined whether the belt is slipping. When the interval exceeds the rated time, the existing controller cuts off the motor power supply based on the detection results of the sensor and timer, avoiding erroneous power outages caused by fluctuations in belt speed.

[0023] In some embodiments, the existing controller is connected to an external PCS alarm system. In this embodiment, after the existing controller cuts off the power, it transmits a signal indicating that the sucker rod motor power is cut off to the PCS alarm system, displays the on-site video to the engineers, and arranges for personnel in the central control room to handle the situation on-site, ultimately achieving the functions of rapid power cut-off, rapid alarm, and rapid response.

[0024] In some embodiments, a 12V power supply is used.

[0025] In some embodiments, the sensor assembly and the existing controller share the same power supply, which is connected to both via wires. In this embodiment, a single power supply is provided, shared by the sensor assembly and the existing controller, suitable for situations where the sensor assembly and the existing controller are located in close proximity.

[0026] In other embodiments, the sensor assembly and the existing controller each use a separate power source. The sensor assembly is equipped with a solar power source, and the sensor and controller communicate wirelessly. The power source for the existing controller is located within the existing controller itself. In this embodiment, two power sources are provided, one for the sensor assembly and one for the existing controller. The sensor assembly and the existing controller communicate wirelessly, which is suitable for situations where the sensor assembly and the existing controller are far apart.

[0027] This utility model also provides an oil pumping unit, including the aforementioned oil pumping unit belt slippage quick power cut-off device.

[0028] The above are merely preferred embodiments of the present utility model, and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent changes made in accordance with the scope of the present utility model application shall still fall within the protection scope of the present utility model.

Claims

1. A device for quickly cutting off power when the pumping unit belt slips, wherein the pumping unit belt connects a large pulley and a small pulley, and the small pulley is driven by a motor; characterized in that: It includes a sensor assembly for detecting the rotational speed of a large pulley, which are electrically connected to each other, an existing controller for receiving signals from the sensor assembly, and a power supply; the sensor assembly consists of a reflector and a sensor, with the sensor mounted on a bracket near the large pulley and the reflector mounted on the large pulley, the two being positioned in a matched manner; the existing controller is connected to the pumping unit's motor and has the function of cutting off the power supply.

2. The quick power cut-off device for slippage of the oil pumping unit belt according to claim 1, characterized in that: The sensor uses an infrared reflective proximity switch, and a mounting bracket is provided on the pumping unit to position the proximity switch in a position that matches the reflector.

3. The quick power cut-off device for slippage of the oil pumping unit belt according to claim 1, characterized in that: The reflective part is made of a patch or a magnet and is fixed to the wheel of the large pulley.

4. The quick power cut-off device for slippage of the oil pumping unit belt according to claim 1, characterized in that: The controller is equipped with a timer.

5. The quick power cut-off device for slippage of the oil pumping unit belt according to claim 1, characterized in that: The existing controller is connected to an external PCS alarm system.

6. The quick power cut-off device for slippage of the oil pumping unit belt according to claim 1, characterized in that: The power supply is 12V.

7. The quick power cut-off device for slippage of the pumping unit belt according to claim 6, characterized in that: The sensor assembly and the existing controller share the same power supply, which is connected to both via wires.

8. The quick power cut-off device for slippage of the oil pumping unit belt according to claim 6, characterized in that: The sensor assembly and the existing controller each use a power source. The sensor assembly is equipped with a solar power source, and the sensor and the controller communicate with each other via wireless signals. The power supply for the existing controller is located within the existing controller.

9. An oil pumping unit, characterized in that: Includes the pumping unit belt slippage quick power cut-off device as described in any one of claims 1-6.

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