Wireless shaft pin sensor

Abstract

A wireless shaft pin sensor comprises a cylindrical stainless steel shaft pin body which is horizontally arranged, two annular grooves are formed in the outer side of the cylindrical stainless steel shaft pin body in the circumferential direction, each annular groove is correspondingly provided with a through hole with the axis in the front-back direction, cover plates are symmetrically arranged in the through holes to form a cavity, a mounting plate is integrally formed in the middle, and a resistance type strain gauge is attached to the middle of the mounting plate. The cavities are communicated through a first channel, a second channel and a third channel lead a wire to an electrical connector outside the shaft pin, and the electrical connector is connected with an external module comprising a power source, a controller and a wireless signal transceiver, so that wireless power supply and data transmission are achieved. The edge of the mounting plate is provided with through holes uniformly distributed at equal angles, so that rigidity is reduced to enhance deformation sensitivity; the shaft pin body is provided with a milling flat groove to prevent installation rotation. According to the sensor, the shearing type strain principle is adopted, the resistance change of the strain gauges is detected through the Wheatstone bridge, precision is high, wiring is convenient and fast, the sensor is suitable for rod-pumped well load testing, remote monitoring of working condition data is achieved in combination with the wireless transmission technology, and the digital oil field management efficiency is improved.

Description

Technical Field

[0001] This utility model relates to a wireless pivot sensor. Background Technology

[0002] Axle pin sensors are specialized sensors for measuring radial loads on components such as bearings and pulleys, or tension in wire ropes. They can replace pulley pins in structures for radial force measurement. Depending on the application, they can be conveniently installed in hooks, rigging shackles, movable pulleys (groups), fixed pulleys (groups), wedge joints, cable joints, marine rigging, open spiral buckles, tie rod heads, and fork joints at the connection points of two metal structures, as well as in the axle holes of connecting forks, lifting rings, and steel wheels. They function as both a replacement for the original axle and a weighing force sensor, greatly simplifying the mechanical components of the entire weighing force control system. (See Chinese Patent CN201911412856.9 for the structure.) Existing axle pin sensors suffer from low measurement accuracy and, due to their installation location, difficult wiring layout, resulting in design challenges for the entire system. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a wireless shaft pin sensor with high measurement accuracy and wireless data transmission. External modules can be arranged nearby for power supply and data transmission, and wiring is convenient.

[0004] To solve the above-mentioned technical problems, this utility model provides a wireless shaft pin sensor, including a horizontally arranged cylindrical stainless steel shaft pin body with its axis running left and right. Two annular grooves are arranged at left-right intervals on the outer circumference of the shaft pin body. Corresponding to each annular groove, a through hole with its axis running front-back is provided on the shaft pin body. The axis of the through hole is on the same horizontal plane as the axis of the shaft pin body, and the axis of the through hole passes through the vertical plane containing the center of the corresponding annular groove. Two circular cover plates matching the through hole are symmetrically arranged at the front and rear of each through hole. The cover plates are coaxial with the through hole. Each through hole and the two cover plates together form a chamber. The distance between the two cover plates in the front-back direction within each through hole is less than the diameter of the shaft pin body. A circular mounting plate matching the through hole is provided at the middle of the front-back direction of each through hole. The mounting plate and the corresponding through hole are coaxial, and the mounting plate and the shaft pin body are integrally formed. A resistance strain gauge is attached to the center of the front and rear sides of each mounting plate. A first channel connecting the two chambers in the left and right direction is provided. A second channel extending in the left and right direction toward the corresponding end face of the shaft pin body is provided at the location of the first channel in one of the chambers. A third channel extending radially outward to the outer surface of the shaft pin body is provided at the end face of the second channel near the corresponding end face of the shaft pin body along the length direction. An electrical connector is provided at the outer end of the third channel. The electrical connector is connected to an external module. The external module includes a power supply, a controller and a wireless signal transceiver that are interconnected. The wires of all strain gauges on the two mounting plates are connected to the external module through the first channel, the second channel and the third channel via the electrical connector.

[0005] For the sake of simplicity, the wireless shaft pin sensor described in this utility model will be referred to as "this sensor" in the following text.

[0006] The principle and advantages of this sensor: This sensor is a shear-type resistance strain gauge sensor with fixed ends and a central load. This product uses stainless steel as the main body of the shaft pin (elastic body) and foil resistance strain gauges as the sensitive conversion element. The bearing housing is installed in the middle of the sensor, and the two ends of the sensor are fixed to the base. When the shaft pin sensor is under load, the load is transferred to the mounting plate. The resistance strain gauges on the mounting plate deform proportionally to the load. This deformation causes a change in the resistance of the strain gauges themselves. Based on the principle of the Wheatstone bridge, the relationship between the magnitude of the force and the change in resistance is calibrated. Therefore, by detecting the change in the resistance of the strain gauges, the force on the sensor can be reflected, thus reflecting the force on the entire drive shaft. This sensor has a simple and reasonable structure, high measurement accuracy, and uses wireless data transmission. External modules can be placed nearby for power supply and data transmission, and wiring is convenient.

[0007] This sensor can be used for load testing of pumping unit wells and is one of the important front-end data acquisition devices for the construction of a digital oilfield oil and gas production Internet of Things. By using it in conjunction with an accelerometer and an angular displacement sensor, it performs periodic online synchronous measurements of the pumping unit suspension point load and polished rod displacement, transmitting the data remotely via a local wireless data communication network to achieve remote measurement of dynamometer data characterizing the operating conditions of the pumping unit well.

[0008] To achieve better performance from this sensor, the preferred solution is as follows:

[0009] Preferably, each mounting plate has four through holes extending from its axial edge near its axial position, and the four through holes on the mounting plate are evenly distributed at equal angles along the axial direction of the mounting plate.

[0010] Perforation can reduce the strength of the mounting plate and increase the elastic deformation of the shaft pin body under stress, thereby increasing the accuracy of the sensor.

[0011] Preferably, the shaft pin body has a milled groove on its outer circumferential side.

[0012] The milled groove can serve as a limit to prevent the sensor from rotating after installation, thus affecting the sensor's force monitoring. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the sensor's structure.

[0014] Figure 2 This is a cross-sectional view of the sensor.

[0015] Figure 3 yes Figure 2 Sectional view along the AA direction. Detailed Implementation

[0016] See Figures 1-3A wireless pivot sensor includes a horizontally arranged cylindrical stainless steel pivot body 1 with its axis oriented left-right. The pivot body 1 has two annular grooves 11 spaced apart on its outer circumference. Corresponding to each annular groove 11, the pivot body 1 has a through hole 12 with its axis oriented front-back. The axis of the through hole 12 is on the same horizontal plane as the axis of the pivot body 1, and the axis of the through hole 12 passes through the vertical plane containing the center of the corresponding annular groove 11 in the width direction. Each through hole 12 has two symmetrically arranged circular cover plates 2 at its front and rear, matching the through hole 12. The cover plates 2 are coaxial with the through hole 12. Each through hole 12 and the two cover plates 2 together form a chamber. The distance between the two cover plates 2 in the front-back direction within each through hole 12 is less than the diameter of the pivot body 1. Each through hole 12 has a circular mounting plate 3 at its center in the front-back direction, matching the through hole 12. The mounting plate 3 is aligned with the corresponding through hole. The 12 are coaxial, and the mounting plate 3 and the shaft pin body 1 are integrally formed. Each mounting plate 3 has a resistance strain gauge 4 attached to the center of the front and rear sides. A first channel 13 connecting the two chambers in the left and right direction is provided. A second channel 14 extending in the left and right direction toward the corresponding end face of the shaft pin body 1 is provided at the position of the first channel 13 in one of the chambers. A third channel 15 extending radially outward to the outer surface of the shaft pin body 1 is provided at the end face of the second channel 14 near the corresponding end face of the shaft pin body 1 in the length direction. An electrical connector 4 is provided at the outer end of the third channel 15. An external module 5 is connected to the electrical connector 4. The external module 5 includes a power supply, a controller and a wireless signal transceiver that are interconnected. The wires of all the strain gauges 4 on the two mounting plates 3 are connected to the external module 5 through the first channel 13, the second channel 14 and the third channel 15 via the electrical connector.

[0017] Each mounting plate 3 has four through holes 31 at its axial edge, which are provided in the front-to-back direction. The four through holes 31 on the mounting plate 3 are evenly distributed at equal angles in the axial direction of the mounting plate 3.

[0018] The main body of the shaft pin has a milled flat groove 16 on the outer side of its circumference.

[0019] The principle and advantages of this sensor: This sensor is a shear-type resistance strain gauge sensor with fixed ends and a central load. This product uses stainless steel as the main body 1 (elastic body) of the shaft pin and foil resistance strain gauges 4 as the sensitive conversion element. The bearing housing is installed in the middle of the sensor, and the two ends of the sensor are fixed to the base. When the shaft pin sensor is under load, the load is transferred to the mounting plate 3. The resistance strain gauges 4 on the mounting plate 3 undergo deformation proportional to the load. This deformation causes a change in the resistance of the strain gauges 4. Based on the principle of the Wheatstone bridge, the relationship between the magnitude of the force and the change in resistance is calibrated. Therefore, by detecting the change in the resistance of the strain gauges 4, the force condition of the sensor can be reflected, thus reflecting the force condition of the entire transmission shaft. This sensor has a simple and reasonable structure, high measurement accuracy, and uses wireless data transmission. The external module 5 can be placed nearby for power supply and data transmission, and wiring is convenient.

[0020] This sensor can be used for load testing of pumping unit wells and is one of the important front-end data acquisition devices for the construction of a digital oilfield oil and gas production Internet of Things. By using it in conjunction with an accelerometer and an angular displacement sensor, it performs periodic online synchronous measurements of the pumping unit suspension point load and polished rod displacement, transmitting the data remotely via a local wireless data communication network to achieve remote measurement of dynamometer data characterizing the operating conditions of the pumping unit well.

[0021] The perforation 31 can reduce the strength of the mounting plate 3 and increase the elastic deformation of the shaft pin body 1 when it is subjected to force, thereby increasing the accuracy of the sensor.

[0022] The milled flat groove 16 can serve as a limit to prevent the sensor from rotating after installation, thus affecting the sensor's force monitoring.

[0023] In this embodiment, to highlight the structural features of the sensor, the electrical components, such as the power supply, controller, wireless transceiver, and connection lines to the resistive strain gauge in the external module 5, are all well-known and mature technologies in the field of science and will not be described in detail in this embodiment.

Claims

1. A wireless pivot sensor, characterized in that: The device includes a horizontally arranged cylindrical stainless steel axle pin body with its axis running left-right. Two annular grooves are spaced apart on the outer circumference of the axle pin body. Corresponding to each annular groove, the axle pin body has a through hole running front-back. The axis of the through hole is on the same horizontal plane as the axis of the axle pin body, and the axis of the through hole passes through the vertical plane containing the center of the corresponding annular groove. Each through hole has two symmetrically placed circular cover plates at its front and rear, matching the through hole. The cover plates are coaxial with the through hole, and each through hole and its two internal cover plates form a cavity. The distance between the two cover plates in the front-back direction within each through hole is less than the diameter of the axle pin body. A circular mounting plate matching the through hole is located at the center of each through hole in the front-back direction. The mounting plate is coaxial with the corresponding through hole and is installed... The plate and the shaft pin body are integrally formed. A resistance strain gauge is attached to the center of the front and rear sides of each mounting plate. A first channel connecting the two chambers in the left and right direction is provided. A second channel extending in the left and right direction toward the corresponding end face of the shaft pin body is provided at the location of the first channel in one of the chambers. A third channel extending radially outward toward the outer surface of the shaft pin body is provided at the end face of the second channel near the corresponding end face of the shaft pin body along the length direction. An electrical connector is provided at the outer end of the third channel. The electrical connector is connected to an external module. The external module includes a power supply, a controller and a wireless signal transceiver that are interconnected. The wires of all the strain gauges on the two mounting plates are connected to the external module through the first channel, the second channel and the third channel via the electrical connector.

2. The wireless pivot sensor according to claim 1, characterized in that: Each of the aforementioned mounting plate locations has four through holes extending from front to back near its axial edge, and the four through holes on the mounting plate are evenly distributed at equal angles along the axial direction of the mounting plate.

3. The wireless pivot sensor according to claim 1, characterized in that: The main body of the shaft pin has a milled flat groove on its outer circumferential side.

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