Circuit breaker travel monitoring device

Abstract

The present invention discloses a circuit breaker travel monitoring device, comprising a first connecting shaft, a second connecting shaft, an intermediate connecting shaft, a grating encoder, and a bracket. One end of the first connecting shaft is coaxially connected to the circuit breaker main shaft, and the other end is provided with a first guide rail. One end of the intermediate connecting shaft is provided with a first guide groove that matches the first guide rail, allowing the intermediate connecting shaft to be radially movable connected to the first connecting shaft. One end of the second connecting shaft is provided with a second guide rail, allowing the intermediate connecting shaft to be radially movable connected to the second connecting shaft. The other end of the second connecting shaft is connected to the grating encoder, which is connected to the bracket. The measuring axis, the second connecting shaft, and the first connecting shaft have the same axis centerline. By disposing the first connecting shaft, the second connecting shaft, and the radially movable intermediate connecting shaft between the circuit breaker main shaft and the grating encoder measuring axis, the present invention can eliminate the effect of circuit breaker main shaft eccentricity on the grating encoder.

Description

Technical Field

[0001] The present invention relates to the field of circuit breakers, and in particular to a circuit breaker travel monitoring device. Background Art

[0002] A grating encoder is a sensor that converts the mechanical geometric displacement of a monitored object into pulses or digital quantities. A grating encoder consists of a grating code disk and a photoelectric detection device, and is typically available in rotary or linear types. The grating code disk of a rotary grating encoder is a circular plate with several rectangular holes equally spaced along its diameter. During measurement, the grating code disk and the monitored object rotate coaxially. The object rotates, driving the grating code disk to rotate at the same speed. The detection device, consisting of electronic components such as light-emitting diodes within the photoelectric encoder, detects and outputs a number of pulse signals. Counting the pulse signals generated by the rotation of the monitored object provides the angle of rotation. Conventional contact grating encoders have a measuring shaft connected to the grating code disk at one end and the monitored object at the other. Rotational motion of the monitored object drives the measuring shaft to rotate synchronously, which in turn drives the grating code disk, thereby measuring the rotation angle. Grating encoders offer high measurement accuracy and stable results, making them widely used in angle measurement.

[0003] Conventional contact-type optical encoders require that the encoder's measuring axis be concentric with the axis of the monitored object. If the monitored object becomes eccentric during rotation, the encoder can be easily damaged. This is because, to ensure measurement accuracy, the distance between the measuring axis and the optical encoder body that can move freely is very small (generally no more than 0.5mm). If the monitored object is eccentric, the eccentricity can easily exceed the encoder's allowable range, causing collision and friction between the measuring axis and the encoder body, potentially damaging the encoder.

[0004] Key parameters of the circuit breaker's opening and closing processes, such as opening distance, overtravel, and speed, provide a direct reflection of the breaker's equipment status and are central to its online monitoring. To obtain these parameters, it's first necessary to acquire the breaker's travel information. During the circuit breaker's opening and closing process, the movement of the transmission components is not purely linear or circular; rather, it involves jitter and eccentricity. Conventional contact-type displacement sensors or angle sensors are easily damaged, making conventional contact-type grating encoders inappropriate for direct use in circuit breaker travel monitoring.

[0005] Therefore, those skilled in the art have devoted themselves to developing a circuit breaker stroke monitoring device that can reliably use a grating encoder. Summary of the Invention

[0006] In view of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is that conventional contact-type grating encoders cannot be directly used for travel monitoring of circuit breakers.

[0007] To achieve the above objectives, the present invention provides a circuit breaker travel monitoring device, comprising:

[0008] a first connecting shaft, one end of which is coaxially connected to the main shaft of the circuit breaker, and the other end of which is provided with a first guide rail protruding from an end surface in the axial direction, and both ends of the first guide rail respectively extend in the radial direction to the outer peripheral surface of the first connecting shaft;

[0009] an intermediate connecting shaft, wherein one end of the intermediate connecting shaft is provided with a first guide groove matching the first guide rail, and both ends of the first guide groove extend radially to the outer circumferential surface of the intermediate connecting shaft, so that the intermediate connecting shaft is connected to the first connecting shaft in a radially movable manner;

[0010] a second connecting shaft, one end of the second connecting shaft being provided with a second guide rail protruding from an end surface in the axial direction, both ends of the second guide rail extending radially to the outer circumferential surface of the second connecting shaft, so that the intermediate connecting shaft is connected to the second connecting shaft in a radially movable manner, and the other end of the second connecting shaft being provided with a connecting hole extending in the axial direction;

[0011] A grating encoder, wherein the grating encoder is provided with a measuring shaft matching the connecting hole, and the measuring shaft, the second connecting shaft and the first connecting shaft have the same axis;

[0012] The bracket includes an end plate and two side plates respectively connected to the two ends of the end plate, the two side plates are respectively fixedly connected to the circuit breaker, the grating encoder is connected to the end plate, the end plate is provided with a through hole, and the measuring shaft is connected to the second connecting shaft through the through hole.

[0013] In a preferred embodiment of the present invention, the circuit breaker travel monitoring device further comprises a sleeve, which is fixedly connected to the end plate so that the first connecting shaft, the intermediate connecting shaft and the second connecting shaft are located in the sleeve.

[0014] Furthermore, the difference between the inner diameter of the sleeve and the diameters of the first connecting shaft and the second connecting shaft is not less than 10 mm.

[0015] Furthermore, the grating encoder is connected to the outer side of the end plate through a fixing plate.

[0016] Furthermore, the fixing plate is provided with a through hole for the measuring shaft to pass through, a fixing hole for fixedly connecting the grating encoder and a waist circular hole for fixedly connecting the end plate, and the end plate is correspondingly provided with a waist circular hole for connecting with the fixing plate.

[0017] Furthermore, the measuring shaft is tightly fitted with the connecting hole.

[0018] Furthermore, the side surface of the second connecting shaft is provided with at least one reinforcement hole extending in the radial direction, at least a portion of the reinforcement hole is provided with a thread, and the reinforcement hole is communicated with the connecting hole.

[0019] Furthermore, one end of the first connecting shaft is provided with a stud extending from the end surface in the axial direction, and the circuit breaker main shaft is provided with a threaded hole matching the stud.

[0020] Furthermore, the first guide groove and the second guide groove are perpendicular to each other.

[0021] Furthermore, the connecting hole of the second connecting shaft is a circular hole or a square hole.

[0022] By disposing a first connecting shaft, a second connecting shaft, and a radially movable intermediate connecting shaft between the circuit breaker main shaft and the grating encoder's measuring axis, the circuit breaker travel monitoring device of the present invention eliminates the effects of circuit breaker main shaft eccentricity on the grating encoder, ensuring accurate measurement results while preventing damage to the grating encoder. The circuit breaker travel monitoring device of the present invention boasts a simple structure, easy operation, accurate and reliable measurement results, and is easy to install and maintain.

[0023] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural diagram of a circuit breaker travel monitoring device according to a preferred embodiment of the present invention;

[0025] Figure 2 This is a structural diagram of a first connecting shaft of a preferred embodiment of the present invention;

[0026] Figure 3 This is a structural diagram of a second connecting shaft in a preferred embodiment of the present invention;

[0027] Figure 4 This is a diagram of the mechanism of the intermediate connecting shaft of a preferred embodiment of the present invention;

[0028] Figure 5 This is a structural diagram of a bracket according to a preferred embodiment of the present invention;

[0029] Figure 6 This is a structural diagram of a sleeve according to a preferred embodiment of the present invention;

[0030] Figure 7 This is a structural diagram of a fixing plate according to a preferred embodiment of the present invention;

[0031] Figure 81 is a structural diagram of a grating encoder according to a preferred embodiment of the present invention;

[0032] Figure 9 It is a schematic diagram of the installation of a circuit breaker travel monitoring device according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0033] The following describes several preferred embodiments of the present invention with reference to the accompanying drawings to make its technical content clearer and easier to understand. The present invention can be embodied in many different forms of embodiments, and the scope of protection of the present invention is not limited to the embodiments mentioned herein.

[0034] In the drawings, components with identical structures are denoted by the same reference numerals, and components with similar structures or functions are denoted by similar reference numerals. The size and thickness of each component shown in the drawings are arbitrary and are not limited by the present invention. For clarity, the thickness of components in some places in the drawings is appropriately exaggerated.

[0035] As shown in the figure, the circuit breaker stroke monitoring device of the present invention includes a first connecting shaft 1, a second connecting shaft 2, an intermediate connecting shaft 3, a grating encoder 4 and a bracket 5. One end of the first connecting shaft 1 is coaxially connected to the circuit breaker main shaft 6, and the other end is provided with a first guide rail 11 protruding from the end face in the axial direction, and the two ends of the first guide rail 11 extend respectively to the outer peripheral surface of the first connecting shaft 1 in the radial direction; one end of the intermediate connecting shaft 3 is provided with a first guide groove 31 matching the first guide rail 11, and the two ends of the first guide groove 31 extend respectively to the outer peripheral surface of the intermediate connecting shaft 3 in the radial direction, so that the intermediate connecting shaft 3 is connected to the first connecting shaft 1 in a radially movable manner; one end of the second connecting shaft 2 is provided with a second guide rail 21 protruding from the end face in the axial direction, and the two ends of the second guide rail 21 extend respectively to the The outer peripheral surface of the second connecting shaft 2 enables the intermediate connecting shaft 3 to be connected to the second connecting shaft 2 in a radially movable manner, and the other end of the second connecting shaft 2 is provided with a connecting hole 22 extending in the axial direction; the grating encoder 4 is provided with a measuring shaft 41 matching the connecting hole 22, and the axial center lines of the measuring shaft 41, the second connecting shaft 2 and the first connecting shaft 1 are the same; the bracket 5 includes an end plate 51 and two side plates 52 respectively connected to the two ends of the end plate 51, and the two side plates 52 are respectively fixedly connected to the circuit breaker, and the grating encoder 4 is connected to the end plate 51, and the first connecting shaft 1, the intermediate connecting shaft 3 and the second connecting shaft 2 are located on the inner side of the end plate 51, and the end plate 51 is provided with a through hole 511, and the measuring shaft 41 is connected to the second connecting shaft 2 through the through hole 511.

[0036] like Figure 2As shown, the grating encoder 4 is cylindrical in shape and contains a measuring shaft 41, a bearing 42, a grating code disk 43, and a measurement circuit 44. The measuring shaft 41 is connected to the grating code disk 43, driving it to rotate together. The measurement circuit 44 senses the rotation angle of the grating code disk 43 and outputs the measurement result. The measuring shaft 41 passes through the bearing 42 and is fixed by the bearing 42.

[0037] When the circuit breaker performs opening and closing operations, the circuit breaker main shaft 6 rotates, driving the first connecting shaft 1 connected to it to rotate synchronously, the first connecting shaft 1 drives the intermediate connecting shaft 3 to rotate synchronously, the intermediate connecting shaft 3 drives the second connecting shaft 2 to rotate synchronously, the second connecting shaft 2 drives the measuring shaft 41 of the grating encoder 4 to rotate synchronously, and then drives the grating code disk 43 to rotate synchronously. The built-in measuring circuit 44 of the encoder senses the rotation of the grating code disk 4, and analyzes the rotation angle, and uploads the monitoring results to the monitoring host, thereby realizing real-time monitoring of the rotation angle of the circuit breaker opening and closing. The present invention is connected to the circuit breaker main shaft 6 through the first connecting shaft 1. When the circuit breaker main shaft 6 is eccentric, the first connecting shaft 1 will generate a force to move in the horizontal and vertical directions. Since the other end of the first connecting shaft 1 is connected to the intermediate connecting shaft 3, the intermediate connecting shaft 3 is not fixed but can move freely in the horizontal and vertical directions. Therefore, the force generated by the eccentricity of the circuit breaker main shaft 6 in the horizontal and vertical directions will be eliminated by the movement of the intermediate connecting shaft 3 and will not be transmitted to the first connecting shaft 1, nor will it be transmitted to the measuring shaft 41 of the encoder 4. Therefore, the encoder measuring shaft 41 will not be damaged due to the eccentricity of the circuit breaker main shaft 6, thereby solving the problem of the encoder 4 being damaged due to the eccentricity of the circuit breaker main shaft 6.

[0038] According to an embodiment of the present invention, the circuit breaker stroke monitoring device further includes a sleeve 7, which is fixedly connected to the end plate 51 of the bracket 5, so that the first connecting shaft 1, the intermediate connecting shaft 3 and the second connecting shaft are located within the sleeve 7, thereby avoiding contamination by external oil or other substances. The sleeve 7 is spaced apart from the outer circumference of the first connecting shaft 1 and the second connecting shaft 2, thereby ensuring the displacement of the intermediate connecting shaft when the circuit breaker main shaft 6 is eccentric. Preferably, the difference between the inner diameter of the sleeve 7 and the diameter of the first connecting shaft 1 and the second connecting shaft 2 is greater than 10 mm, thereby ensuring that the space in which the intermediate connecting shaft 3 can slide freely is greater than the maximum displacement caused by the eccentricity of the circuit breaker main shaft 6. A threaded hole 71 is provided on one end surface of the sleeve 7, which matches the fixing hole 512 on the end surface 51 of the bracket 5, and the sleeve 7 is mounted on the bracket 5 by screws.

[0039] The grating encoder 4 is connected to the outer side of the end plate 51 via a fixing plate 8. The fixing plate 8 is provided with a through-hole 81 for the measuring axis 41 to pass through, a fixing hole 82 for fixedly connecting the grating encoder 4, and a scalloped hole 83 for fixedly connecting to the end plate 51. The end plate 51 is correspondingly provided with a scalloped hole 513 for connection to the fixing plate 8. By providing corresponding scalloped holes in the fixing plate 8 and the end plate 51 of the bracket 5, the installation position of the grating encoder 4 on the bracket 5 can be adjusted, ensuring that the measuring axis 41 of the grating encoder 4 is aligned with the axis centerline of the circuit breaker main shaft 6 during initial installation, thereby reducing the impact of circuit breaker main shaft eccentricity on the grating encoder.

[0040] According to an embodiment of the present invention, the measuring shaft 41 is tightly fitted with the connecting hole 22. Figure 3 As shown, the connecting hole 22 can be a circular hole or a square hole, and the end of the measuring shaft 41 is configured to match the circular hole, further ensuring that the measuring shaft 41 rotates synchronously with the second connecting shaft 2. Furthermore, two reinforcement holes 23 extending in the radial direction are provided on the side of the second connecting shaft 2. At least a portion of the reinforcement holes 23 is provided with threads. The reinforcement holes 23 are connected to the connecting hole 22. Screws pass through the reinforcement holes 23 and press against the measuring shaft 41 in the connecting hole 22 to further secure the measuring shaft 41.

[0041] According to an embodiment of the present invention, one end of the first connecting shaft 1 is provided with a stud 12 extending axially from the end surface, and the circuit breaker main shaft 6 is provided with a threaded hole matching the stud 12. Alternatively, a square column or a hexagonal column can be provided at one end of the first connecting shaft 1, and the circuit breaker main shaft 6 is provided with a connecting hole of a matching shape.

[0042] According to an embodiment of the present invention, the first guide groove 31 and the second guide groove 32 of the intermediate connecting shaft 3 are arranged vertically. In addition, the first connecting shaft 1, the second connecting shaft 2 and the intermediate connecting shaft 3 are made of metal, preferably stainless steel.

[0043] The two side panels 52 of the bracket 5 have mounting holes 521. The positions of the mounting holes 521 correspond to the positions of the fixing screws of the circuit breaker to be tested. The bracket 5 is fixed to the circuit breaker with the help of the circuit breaker's own fixing screws. As shown in the figure, the mounting holes 521 are pear-shaped holes. During installation, there is no need to remove the circuit breaker's fixing screws. Instead, you only need to loosen the fixing screws, insert the pear-shaped mounting holes 521 into the fixing screws, and then tighten the fixing screws to secure the bracket to the circuit breaker.

[0044] The transmission of any mechanical force (non-electromagnetic force) requires contact between two objects. According to the principle of force decomposition, any force can be decomposed into horizontal and vertical forces. During the rotation of the circuit breaker, the force exerted on the grating encoder due to the eccentricity of the rotating shaft can also be decomposed into horizontal and vertical forces. For forces in a certain direction that could damage the grating encoder, damage can be avoided by blocking the transmission path of the force.

[0045] This invention, based on conventional contact-type grating encoders, employs a transmission component designed based on the principles of force transmission and decomposition, thus avoiding damage to the contact-type grating encoder caused by eccentricity of the circuit breaker's rotating shaft. The grating encoder first acquires angular displacement information during the circuit breaker's opening and closing processes, which is then multiplied by the rotation radius and transmission ratio to ultimately obtain travel information during the circuit breaker's opening and closing processes.

[0046] The above describes in detail the preferred embodiments of the present invention. It should be understood that numerous modifications and variations based on the concepts of the present invention are possible without inventive effort by those skilled in the art. Therefore, any technical solution that can be derived by those skilled in the art through logical analysis, reasoning, or limited experimentation based on the concepts of the present invention and the prior art should be within the scope of protection defined by the claims.

Claims

1. A circuit breaker travel monitoring device, characterized in that: include: a first connecting shaft, one end of which is coaxially connected to the main shaft of the circuit breaker, and the other end of which is provided with a first guide rail protruding from an end surface in the axial direction, and both ends of the first guide rail respectively extend in the radial direction to the outer peripheral surface of the first connecting shaft; an intermediate connecting shaft, wherein one end of the intermediate connecting shaft is provided with a first guide groove matching the first guide rail, and both ends of the first guide groove extend radially to the outer circumferential surface of the intermediate connecting shaft, so that the intermediate connecting shaft is connected to the first connecting shaft in a radially movable manner; a second connecting shaft, one end of the second connecting shaft being provided with a second guide rail protruding from an end surface in the axial direction, both ends of the second guide rail extending radially to the outer circumferential surface of the second connecting shaft, so that the intermediate connecting shaft is connected to the second connecting shaft in a radially movable manner, and the other end of the second connecting shaft being provided with a connecting hole extending in the axial direction; A grating encoder, wherein the grating encoder is provided with a measuring shaft matching the connecting hole, and the measuring shaft, the second connecting shaft and the first connecting shaft have the same axis; The bracket includes an end plate and two side plates respectively connected to the two ends of the end plate, the two side plates are respectively fixedly connected to the circuit breaker, the grating encoder is connected to the end plate, the end plate is provided with a through hole, and the measuring shaft is connected to the second connecting shaft through the through hole.

2. The circuit breaker travel monitoring device according to claim 1, characterized in that: Also included is a sleeve fixedly connected to the end plate such that the first connecting shaft, the intermediate connecting shaft, and the second connecting shaft are positioned within the sleeve.

3. The circuit breaker travel monitoring device according to claim 2, characterized in that: The difference between the inner diameter of the sleeve and the diameters of the first connecting shaft and the second connecting shaft is not less than 10 mm.

4. The circuit breaker travel monitoring device according to claim 1, wherein: The grating encoder is connected to the outer side of the end plate through a fixing plate.

5. The circuit breaker travel monitoring device according to claim 4, characterized in that: The fixing plate is provided with a through hole for the measuring shaft to pass through, a fixing hole for fixedly connecting the grating encoder and a waisted circular hole for fixedly connecting the end plate. The end plate is correspondingly provided with a waisted circular hole for connecting with the fixing plate.

6. The circuit breaker travel monitoring device according to claim 1, wherein: The measuring shaft is tightly fitted with the connecting hole.

7. The circuit breaker travel monitoring device according to claim 1, wherein: The side surface of the second connecting shaft is provided with at least one reinforcement hole extending in a radial direction, at least a portion of the reinforcement hole is provided with a thread, and the reinforcement hole is communicated with the connecting hole.

8. The circuit breaker travel monitoring device according to claim 1, wherein: One end of the first connecting shaft is provided with a stud extending from the end surface in the axial direction, and the circuit breaker main shaft is provided with a threaded hole matching the stud.

9. The circuit breaker travel monitoring device according to claim 1, wherein: It also includes a second guide groove, and the first guide groove and the second guide groove are perpendicular to each other.

10. The circuit breaker travel monitoring device according to any one of claims 1 to 9, characterized in that: The connecting hole of the second connecting shaft is a circular hole or a square hole.

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