Angular displacement sensor transmission mechanism

Abstract

The utility model relates to sensor measurement structure technical field, more particularly to a kind of angular displacement sensor transmission mechanism, using the structure provided by the utility model, it mainly includes first transmission rod, second transmission rod, first snap ring, second snap ring and support rod, one end of the support rod is connected with the one end of the first transmission rod by first snap ring, the other end of the first transmission rod is slidably connected with the one end of the second transmission rod by second snap ring, the other end of the second transmission rod is used to be connected with the axle in angular displacement sensor by first bolt. Through the above structure, parallel movement value can be converted into rotation movement value, the measurement mode of angular displacement sensor can be effectively matched, and the stroke of guide vane servomotor is measured.

Description

Technical Field

[0001] This utility model relates to the field of sensor measurement structure technology, and more specifically, to a transmission mechanism for an angular displacement sensor. Background Technology

[0002] The governor control system of a flow turbine responds to the frequency and load requirements of the unit by controlling the guide vane opening. The closed-loop regulation of the governor control system depends on the stability and accuracy of the guide vane opening. Therefore, accurate and stable measurement of the guide vane opening is a necessary condition for the normal operation of the governor control system.

[0003] Currently, most governor control systems use linear displacement sensors as guide vane opening measurement devices. Two steel plates are welded parallel to the side of the servo cylinder to form the basic structure for the linear sensor's mounting bracket. An angle iron is welded to the servo piston rod to serve as the transmission mechanism for the sensor's stroke slider. The two fixed brackets of the linear sensor are fixed to the basic steel plates with bolts. The magnetostrictive slider on the sensor is connected to the angle iron bracket via a straight rod and a universal joint, enabling the linear sensor to measure the stroke change of the servo piston rod. However, this method is relatively simple, so some power plants have added angular displacement sensors for opening measurement. Angular displacement sensors use a wire-wound potentiometer to reflect the displacement value; therefore, they cannot directly measure the stroke of the parallel-moving guide vane servo, requiring a dedicated transmission mechanism. The sensor body is fixed to the sensor bracket, and the sensor's central shaft is connected to the transmission mechanism with connecting bolts. The transmission mechanism is then connected to the guide vane servo piston rod push-pull head. The piston rod push-pull head of the guide vane relay drives the central shaft of the sensor to rotate synchronously through the transmission mechanism. At the same time, the guide vane opening value is converted into current or voltage through a wire-wound potentiometer and fed back to the control system.

[0004] The governor control system uses linear sensors to measure the guide vane opening, which is a relatively simple method. Even if multiple sensors are redundantly configured, they are installed in the same position. If the sensor's mounting bracket or the angle iron that controls the piston rod stroke is damaged, it will cause all linear sensors to fail, directly affecting the closed-loop regulation function of the governor control system. Utility Model Content

[0005] The purpose of this invention is to provide a transmission mechanism for an angular displacement sensor to overcome the shortcomings of using linear sensors to measure guide vane opening in the prior art.

[0006] This utility model is achieved through the following technical solution: An angular displacement sensor transmission mechanism includes a first transmission rod, a second transmission rod, a first retaining ring, a second retaining ring, and a support rod. One end of the support rod is connected to one end of the first transmission rod via the first retaining ring, and the other end of the first transmission rod is slidably connected to one end of the second transmission rod via the second retaining ring. The other end of the second transmission rod is used to connect to the central shaft of the angular displacement sensor via a first bolt.

[0007] Preferably, the other end of the support rod is used to connect and fix it to the piston rod of the relay via a nut.

[0008] Preferably, the first transmission rod has connecting portions at both ends, and the connecting portions have internal threads.

[0009] Preferably, both the bottom of the first retaining ring and the second retaining ring are provided with screws, and the middle of the screws are provided with internal threads. The first retaining ring and the second retaining ring are respectively threadedly connected to the internal threads of the connecting part through the screws.

[0010] Preferably, one end of the second transmission rod is provided with a strip-shaped through hole, the second retaining ring is connected to the strip-shaped through hole by a second bolt, the second bolt slides in the strip-shaped through hole, and the other end of the second transmission rod is respectively provided with a through hole connected to the first bolt and a through hole connected to the central shaft of the angular displacement sensor.

[0011] Preferably, a ball is provided at the end of the support rod that is connected to the retaining ring.

[0012] Preferably, one side of the sphere is provided with a screw for connecting with the first retaining ring.

[0013] Preferably, a fastening nut is provided at one end of the support rod that passes through the first retaining ring.

[0014] The technical solution of this utility model has at least the following advantages and beneficial effects: 1. The structure provided by this utility model mainly includes a first transmission rod, a second transmission rod, a first retaining ring, a second retaining ring, and a support rod. One end of the support rod is connected to the transmission rod via the first retaining ring, and the other end of the first transmission rod is slidably connected to one end of the second transmission rod via the second retaining ring. The other end of the second transmission rod is used to connect to the central shaft of the angular displacement sensor via a first bolt. With the above structure, parallel movement values ​​can be converted into rotational movement values, effectively matching the measurement method of the angular displacement sensor and realizing the measurement of the guide vane relay stroke.

[0015] 2. The function of converting parallel movement values ​​into rotational movement values ​​is achieved using a relatively simple structure and materials. It is easy to implement, has a simple structure, and low manufacturing cost, while also taking into account the requirements of reliable connection and flexible movement.

[0016] 3. The new transmission mechanism is suitable for angular displacement sensors, realizing the function of stable measurement of the parallel movement of the guide vane relay by the angular displacement sensor, providing a new measurement method for the stroke measurement of the speed controller guide vane relay, and avoiding the singleness of the guide vane relay stroke measurement.

[0017] 4. Given the significant vibration in the water turbine chamber, a retaining ring was used to connect the transmission rod 1 to the support rod. The connection has a certain vibration margin, effectively reducing the vibration variable, ensuring the stability of the angular displacement sensor sampling value, and improving the reliability of the guide vane relay stroke measurement. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 For the present utility model Figure 1 Top view; Figure 3 This is a schematic diagram of the structure of the first transmission rod of this utility model; Figure 4 This is a schematic diagram of the structure of the second transmission rod of this utility model; Figure 5 This is a schematic diagram of the structure of the first retaining ring of this utility model; Figure 6 This is a schematic diagram of the support rod of this utility model.

[0020] Icons: 1-Support rod, 2-Fasting nut, 3-First retaining ring, 4-First transmission rod, 5-Second bolt, 6-Second transmission rod, 7-Angular displacement sensor, 8-First bolt, 9-Second retaining ring. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Please refer to Figures 1-6The present invention provides a transmission mechanism for an angular displacement sensor 7, comprising a first transmission rod 4, a second transmission rod 6, a first retaining ring 3, a second retaining ring 9, and a support rod 1. One end of the support rod 1 is connected to one end of the first transmission rod 4 via the first retaining ring 3, and the other end of the first transmission rod 4 is slidably connected to one end of the second transmission rod 6 via the second retaining ring 9. The other end of the second transmission rod 6 is used to connect to the central shaft of the angular displacement sensor 7 via a first bolt 8. In addition, the other end of the support rod 1 is used to connect and fix to the piston rod of the relay via a nut. The first retaining ring 3 and the second retaining ring 9 have identical structures.

[0023] When in use, the piston rod of the speed governor guide vane relay moves, which controls the parallel movement of the support rod 1. The support rod 1 drives one end of the first transmission rod 4 to move horizontally, while the other end of the first transmission rod 4 moves in an arc with the central axis of the angular displacement sensor 7 as the center and the length of the second transmission rod 6 as the radius, as the piston rod of the speed governor guide vane relay moves. This drives the central axis of the angular displacement sensor 7 to rotate, thus achieving the purpose of converting the parallel movement value into the rotational movement value.

[0024] The structure provided by this utility model mainly includes a first transmission rod 4, a second transmission rod 6, a first retaining ring 3, a second retaining ring 9, and a support rod 1. One end of the support rod 1 is connected to the transmission rod via the first retaining ring 3. The other end of the first transmission rod 4 is slidably connected to one end of the second transmission rod 6 via the second retaining ring 9. The other end of the second transmission rod 6 is used to connect to the central shaft of the angular displacement sensor 7 via a first bolt 8. With this structure, parallel movement values ​​can be converted into rotational movement values, effectively matching the measurement method of the angular displacement sensor 7 and realizing the measurement of the guide vane relay stroke.

[0025] In one exemplary embodiment of this utility model, the first transmission rod 4 is provided with connecting portions at both ends, and the connecting portions are provided with internal threads.

[0026] The connecting part is a drum-shaped internal threaded connector to facilitate effective connection of the first retaining ring 3 and the second retaining ring 9.

[0027] In one exemplary embodiment of this utility model, the bottom of the first retaining ring 3 and the second retaining ring 9 are both provided with screws, and the middle of the screws are provided with internal threads. The first retaining ring 3 and the second retaining ring 9 are respectively threadedly connected to the internal threads of the connecting part through the screws.

[0028] In one exemplary embodiment of this utility model, one end of the second transmission rod 6 is provided with a strip-shaped through hole, the second retaining ring 9 is connected to the strip-shaped through hole by the second bolt 5, the second bolt 5 slides in the strip-shaped through hole, and the other end of the second transmission rod 6 is respectively provided with a through hole connected to the first bolt 8 and a through hole connected to the central shaft of the angular displacement sensor 7.

[0029] Specifically, one end of the second transmission rod 6 has an elliptical hole for mounting bolts, and the other end has a circular hole that matches the central shaft of the angular displacement sensor 7. At the same time, a rectangular notch is opened along the direction of the transmission rod from the circular hole, and a hole is opened in the perpendicular direction of the rectangular notch for mounting and fixing the first bolt 8. The second transmission rod 6 is equipped with two sets of internal hex bolts (including flat washers, spring washers and nuts).

[0030] In one exemplary embodiment of this utility model, a ball is provided at one end of the support rod 1 that connects to the retaining ring. A screw for connecting to the first retaining ring 3 is provided on one side of the ball. A fastening nut 2 is provided at one end of the support rod 1 that passes through the first retaining ring 3.

[0031] The first transmission rod 4, the second transmission rod 6, the first retaining ring 3, and the second retaining ring 9 are connected in a plane. The central shaft of the angular displacement sensor 7 and the support rod 1 are perpendicularly connected to this plane. The first retaining ring 3 and the second retaining ring 9 are respectively installed at both ends of the first transmission rod 4, and nuts can be added for locking. One end of the support rod 1 is connected to the piston rod push-pull head of the speed governor guide vane relay by welding, and the other end is fitted into the first retaining ring 3. At the same time, corresponding flat washers and fastening nuts 2 are installed on the screw at the end of the support rod 1 to ensure reliable engagement of the retaining ring. The second retaining ring 9 is aligned with the elliptical hole of the second transmission rod 6 and connected in series with bolts. The central shaft of the angular displacement sensor 7 is inserted into the circular hole of the second transmission rod 6 and locked with bolts to ensure that the central shaft of the angular displacement sensor 7 rotates reliably with the second transmission rod 6 and avoids misalignment that affects measurement accuracy.

[0032] A transmission mechanism suitable for the angular displacement sensor 7 is completed using a simplified structure and lower cost. All connections in the transmission mechanism utilize retaining rings, with the retaining rings making arc-shaped contact with the support rod 1 and the transmission rod. Nuts or the main body on both sides prevent detachment, reducing transmission friction, ensuring reliable displacement of each component, and maintaining sufficient margin and clearance to offset measurement errors caused by vibration. Using this transmission mechanism, the angular displacement sensor 7 provides stable and reliable measurements. After calibration, its deviation from the sampling value of a linear displacement sensor is within 0.4%, meeting the operational requirements of the turbine governor control system.

[0033] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A transmission mechanism for an angular displacement sensor, characterized in that, It includes a first transmission rod (4), a second transmission rod (6), a first retaining ring (3), a second retaining ring (9), and a support rod (1). One end of the support rod (1) is connected to one end of the first transmission rod (4) through the first retaining ring (3), and the other end of the first transmission rod (4) is slidably connected to one end of the second transmission rod (6) through the second retaining ring (9). The other end of the second transmission rod (6) is used to connect to the central shaft of the angular displacement sensor (7) through a first bolt (8).

2. The angular displacement sensor transmission mechanism according to claim 1, characterized in that, The other end of the support rod (1) is used to connect and fix it to the piston rod of the relay via a nut.

3. The angular displacement sensor transmission mechanism according to claim 1, characterized in that, The first transmission rod (4) has connecting parts at both ends, and the connecting parts are provided with internal threads.

4. The angular displacement sensor transmission mechanism according to claim 3, characterized in that, The bottom of the first retaining ring (3) and the second retaining ring (9) are provided with screws, and the middle of the retaining ring is provided with internal threads. The first retaining ring (3) and the second retaining ring (9) are respectively threaded to the internal threads of the connecting part through the screws.

5. The angular displacement sensor transmission mechanism according to claim 4, characterized in that, One end of the second transmission rod (6) is provided with a strip-shaped through hole. The second retaining ring (9) is connected to the strip-shaped through hole by the second bolt (5). The second bolt (5) slides in the strip-shaped through hole. The other end of the second transmission rod (6) is provided with a through hole connected to the first bolt (8) and a through hole connected to the central shaft of the angular displacement sensor (7).

6. The angular displacement sensor transmission mechanism according to claim 4, characterized in that, A ball is provided at one end of the support rod (1) that is connected to the retaining ring.

7. The angular displacement sensor transmission mechanism according to claim 6, characterized in that, One side of the sphere is provided with a screw for connecting with the first retaining ring (3).

8. The angular displacement sensor transmission mechanism according to claim 6, characterized in that, A fastening nut (2) is provided at one end of the support rod (1) that passes through the first retaining ring (3).

Images