Isolation load switch

Abstract

The utility model discloses an isolation load switch, and relates to the technical field of rail transit traction power supply systems. The technical key points are as follows: a fixed insulator and an operating insulator are arranged on a chassis, the lower end of the operating insulator is fixedly connected with a switch main shaft, the switch main shaft is connected with the upper end of a transmission connecting rod, and the lower end of the transmission connecting rod is connected with an operating mechanism; a position detection mechanism is arranged on one side of the switch spindle away from the transmission connecting rod; the position detection mechanism can detect the position information of the switch main shaft when the switch main shaft moves. Through the position detection mechanism arranged at one side of the switch main shaft, the position information of the switch main shaft connected with the operation insulator in the isolation load switch can be directly obtained, so that a worker can conveniently and accurately control and monitor the state of the isolation load switch.

Description

Technical Field

[0001] This application relates to the technical field of rail transit traction power supply systems, and particularly to an isolating load switch. Background Art

[0002] Railway catenary isolating (load) switches are generally installed on special brackets on poles, structural columns or walls. The rotating shaft of the isolating load switch is connected by a transmission rod, and the isolating load switch is operated for closing and opening by manual rotation, on-site electric operation or remote control electric operation. The external output position signal generally adopts an indirect method, that is, by outputting the position signal of the corresponding operating mechanism of the isolating load switch or by the maintenance worker observing the action of the operating mechanism located at a lower position to judge the switch state of the isolating load switch in the air. Due to the large height difference between the operating mechanism and the isolating load switch, there is a relatively long transmission connecting rod between the two to transmit the action. If there is a problem with a part of the transmission connecting rod, at this time, relying solely on the action of the operating mechanism to reflect the state information of the isolating load switch, there is obviously a problem that it is difficult to intuitively and accurately display the position state of the isolating load switch. Utility Model Content

[0003] This application provides an isolating load switch, which can directly obtain the position information of the switch main shaft connected to the operating insulator in the isolating load switch, so as to facilitate the staff to accurately control and monitor the state of the isolating load switch.

[0004] The above object of this application is achieved through the following technical solutions:

[0005] An isolating load switch, comprising a fixed insulator and an operating insulator installed on a chassis. The lower end of the operating insulator is fixedly connected to a switch main shaft. The upper end of the switch main shaft is connected to the upper end of a transmission connecting rod, and the lower end of the transmission connecting rod is connected to an operating mechanism;

[0006] Part of the structures of the switch main shaft and the transmission connecting rod are located in the same sub-member of the chassis; a position detection mechanism is provided on one side of the switch main shaft away from the transmission connecting rod, and the position detection mechanism is installed in the sub-member of the chassis where the switch main shaft is located; the position detection mechanism can detect the position information of the switch main shaft when the switch main shaft moves.

[0007] Further, the position detection mechanism includes a cam sleeved on the switch main shaft. An installation box is provided on the side of the cam away from the transmission connecting rod. The installation box and the switch main shaft are installed in the same sub-member on the chassis. A detection sensor is provided in the installation box. The contact end of the detection sensor is located outside the installation box and faces the switch main shaft. An extrusion unit is provided on one side of the contact end of the detection sensor. When the cam rotates with the switch main shaft and contacts the extrusion unit, a force can be applied to the contact end of the detection sensor through the extrusion unit.

[0008] Further, the extrusion unit includes a fixed bracket fixedly installed on the detection sensor and located on one side of the contact end of the detection sensor. One end of a rocker arm is hinged to the side of the fixed bracket close to the cam. The other end of the rocker arm is rotatably connected with a roller. The rocker arm is arranged obliquely upward, and a protrusion is provided on the side of the rocker arm close to the contact end of the detection sensor.

[0009] Further, a torsion spring is provided on the rotating shaft of the rocker arm connected to the fixed bracket.

[0010] Further, the cam is composed of two parts, a left cam and a right cam, and the left cam and the right cam are connected together by bolts.

[0011] Further, the detection sensor is a contact type limit switch.

[0012] Further, the detection sensor is a contact type pressure sensor.

[0013] In summary, the present application includes at least one of the following beneficial technical effects:

[0014] The position detection mechanism provided on one side of the switch main shaft at the lower end of the operating insulator in the isolating load switch of the present application can timely detect the movement of the switch main shaft when the operating mechanism drives the switch main shaft to rotate through the transmission connecting rod, so as to facilitate the staff to more directly and accurately understand the specific state of the isolating load switch. Compared with the prior art method of indirectly judging the state of the isolating load switch through the movement of the operating mechanism, the present application is significantly more convenient for the staff to intuitively and accurately obtain the state of the isolating load switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 is the overall structural schematic diagram of the present application;

[0017] Figure 2 is the internal structural schematic diagram of the sub-member in the chassis of the present application for installing the operating insulator and fixing the insulator;

[0018] Figure 3 is Figure 2 the enlarged structural schematic diagram at position A in

[0019] Reference numerals: 1, chassis; 2, fixed insulator; 3, operating insulator; 4, switch main shaft; 5, transmission link; 6, operating mechanism; 7, position detection mechanism; 71, cam; 72, mounting box; 73, detection sensor; 74, extrusion unit; 741, fixed bracket; 742, rocker arm; 743, roller; 744, protrusion. Detailed implementation manners

[0020] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts also belong to the scope of protection of the present application.

[0021] As Figure 1 and Figure 2 shown, a disconnecting load switch disclosed in the present application includes a fixed insulator 2 and an operating insulator 3 installed on a chassis 1. The lower end of the operating insulator 3 is fixedly connected to a switch main shaft 4. The switch main shaft 4 is connected to the upper end of a transmission link 5, and the lower end of the transmission link 5 is connected to an operating mechanism 6; part of the structures of the switch main shaft 4 and the transmission link 5 are located in the same sub-member of the chassis 1; on the side of the switch main shaft 4 away from the transmission link 5, there is a position detection mechanism 7, and the position detection mechanism 7 is installed in the sub-member of the chassis 1 where the switch main shaft 4 is located; the position detection mechanism 7 can detect the position information of the switch main shaft 4 when the switch main shaft 4 moves.

[0022] In the above embodiments, most of the isolating load switches in the prior art are installed on special brackets on pillars, concrete structural columns or walls. Fixed insulators 2 (post insulators) and operating insulators 3 are usually installed on the brackets. The upper end of the transmission link 5 is connected to the lower end of the operating insulator 3. The lower end of the transmission link 5 extends downward along the pillar or concrete structural column or wall where the isolating load switch is installed and is connected to the operating mechanism 6. The operating mechanism 6 is usually also installed on the same installation base as the transmission link 5. The external structure of the isolating load switch in the prior art is similar to the overall external structure of the isolating load switch in the present application. Therefore, the general structure of the isolating load switch in the prior art can be referred to in the present application's Figure 1 . The height of the operating mechanism 6 is generally not higher than the height of an ordinary person, which is convenient for workers to control the isolating load switch at a high place or perform maintenance on the operating mechanism 6 by operating the operating mechanism 6. An indication mark is provided at the connection between the lower end of the transmission link 5 and the operating mechanism 6, and a pointer is provided at the top of the operating mechanism 6 with a fixed position. When the operating mechanism 6 controls the transmission link 5 to work, the position of the transmission link 5 in the vertical direction will change. In this way, different marks on the transmission link 5 will align with the pointer on the operating mechanism 6, so as to facilitate the operator to understand the state of the isolating load switch at a high place that is difficult to observe under the control of the operating mechanism 6. Or for the remotely controlled operating mechanism 6, a position sensor is generally provided on the operating mechanism 6, and the position state of the isolating load switch is also indirectly judged through the operating mechanism 6. However, the length of the transmission link 5 is generally relatively long and may be divided into several sections in the middle. The middle area position of the transmission link 5 is not low either. When a power failure or other faults occur in the middle area of the transmission link 5, if the opening and closing state of the isolating load switch at a high place is still indirectly judged by the operating mechanism 6 at a low place at this time, it is easy to misjudge the state of the isolating load switch.

[0023] The position detection mechanism 7 provided on one side of the switch main shaft 4 at the lower end of the operating insulator 3 in the present application can directly detect the position information of the switch main shaft 4. In this way, when the worker transmits the action along the transmission link 5 to the switch main shaft 4 through the operating mechanism 6, driving the switch main shaft 4 to drive the operating insulator 3 to rotate, the position detection mechanism 7 can timely transmit the information about the change in the position of the switch main shaft 4 to the monitoring system or the ground staff. Since the switch main shaft 4 detected by the position detection mechanism 7 is directly connected to the operating insulator 3 of the isolating load switch, the present application can directly obtain the position signal of the switch main shaft 4 in the isolating load switch. Compared with the method of indirectly transmitting signals through the operating mechanism 6 in the prior art, only the effective power transmission of the transmission link 5 to the isolating load switch will be monitored. The understanding of the state of the isolating load switch in the present application is significantly more intuitive, accurate and stable.

[0024] Furthermore, as Figure 2As shown in the figure, the position detection mechanism 7 includes a cam 71 sleeved on the switch main shaft 4. On the side of the cam 71 away from the transmission connecting rod 5, there is an installation box 72. The installation box 72 and the switch main shaft 4 are installed in the same sub-member on the chassis 1. Inside the installation box 72, there is a detection sensor 73. The contact end of the detection sensor 73 is located outside the installation box 72 and faces the switch main shaft 4. On one side of the contact end of the detection sensor 73, there is a pressing unit 74. When the cam 71 rotates with the switch main shaft 4 and contacts the pressing unit 74, the pressing unit 74 can apply a force to the contact end of the detection sensor 73.

[0025] In the above embodiments, the cam 71 is fixedly installed on the switch main shaft 4. When the transmission connecting rod 5 drives the switch main shaft 4 to rotate, the position of the protruding end of the cam 71 will change periodically along the circumference of the switch main shaft 4. Correspondingly, the distance between the protruding end of the cam 71 and the detection sensor 73 will also change accordingly (in actual use, since the isolating load switch mainly performs switching operations, the rotation of the operating insulator 3 and the switch main shaft 4 actually swings back and forth within a certain angle). When the worker controls the action of the isolating load switch through the operating mechanism 6, according to the different signals transmitted by the detection sensor 73, the worker can clearly and accurately know the position state of the isolating load switch at this time. In this application, the detection sensor 73 and the pressing unit 74 are installed in the sub-member on the chassis 1 where the operating insulator 3 is installed through the installation box 72. This can not only make the overall layout of the isolating load switch more compact, but also enhance the protection performance of the detection sensor 73 and the pressing unit 74 through the chassis 1, effectively resisting the influence of external environmental factors during use.

[0026] Further, as Figure 2 and Figure 3 shown, the pressing unit 74 includes a fixed bracket 741. The fixed bracket 741 is fixedly installed on the detection sensor 73 and is located on one side of the contact end of the detection sensor 73. One end of the fixed bracket 741 close to the cam 71 is hinged to one end of a rocker arm 742. The other end of the rocker arm 742 is rotatably connected with a roller 743. The rocker arm 742 is inclined upward, and a protrusion 744 is provided on the side of the rocker arm 742 close to the contact end of the detection sensor 73.

[0027] In the above embodiments, when the isolating load switch switches between the open and closed states, the switch main shaft 4 at the lower end of the operating insulator 3 will move together with the cam 71. There is a limiting block at the connection point between the fixed bracket 741 and the rocker arm 742, and the limiting baffle can prevent the rocker arm 742 from swinging downward to the horizontal state (this effect can be achieved by a limiting rotating shaft in the prior art. For example, a common notebook can only be opened to a specific angle at most, and the specific principle will not be elaborated). In this way, when the cam 71 contacts the roller 743 at the end of the rocker arm 742, the cam 71 will squeeze the roller 743, and the roller 743 will drive the rocker arm 742 to rotate towards the detection sensor 73. After the protrusion 744 on the rocker arm 742 touches the contact end of the detection sensor 73, it will apply a force to the detection sensor 73, causing it to generate a corresponding signal, so that workers can quickly obtain the corresponding position state of the isolating load switch. The roller 743 is rotatably connected to the rocker arm 742. In this way, when the cam 71 contacts the roller 743, the sliding friction can be converted into rolling friction, which can not only reduce the friction loss between the cam 71 and the roller 743, but also reduce the resistance received during the rotation of the cam 71.

[0028] Further, a torsion spring is provided on the rotating shaft where the rocker arm 742 is connected to the fixed bracket 741.

[0029] In the above embodiments, adding a torsion spring on the rotating shaft connecting the rocker arm 742 and the fixed bracket 741 can ensure the close contact state between the two when the cam 71 contacts the roller 743, and in this way, the cam 71 can transmit the force to the roller 743 more evenly and smoothly.

[0030] Further, as Figure 2 shown, the cam 71 is composed of a left cam 71 and a right cam 71, and the left cam 71 and the right cam 71 are connected together by bolts.

[0031] In the above embodiments, the cam 71 of the present application is composed of a left cam 71 and a right cam 71 in cooperation, and the left cam 71 and the right cam 71 are connected by bolts, so it is very convenient for both installation and disassembly.

[0032] Further, the detection sensor 73 is a contact type limit switch.

[0033] In the above embodiments, the limit switch is an electrical switch used to limit the extreme position of the mechanical equipment. There are contact and non-contact limit switches. The contact limit switch adopted in this application is a commonly used small-current master switch. It uses the collision of the moving parts of the production machinery to actuate its contacts to achieve the on or off control circuit and reach a certain control purpose. Usually, such switches are used to limit the position or stroke of the mechanical movement, so that the moving machinery automatically stops, moves in the reverse direction, changes speed, or moves back and forth automatically at a certain position or stroke. It can be used to control the stroke and limit protection of mechanical equipment. In actual production, the limit switch is generally installed at a pre-arranged position. When the module installed on the moving part of the production machinery hits the travel switch, the contacts of the limit switch actuate to realize the switching of the circuit. Therefore, the travel switch is an electrical appliance that switches the circuit according to the travel position of the moving part, and its principle of action is similar to that of a button. The contact limit switch is a prior art, and the specific principle will not be elaborated here.

[0034] When the contact limit switch of this application is in use, the distance between the extrusion unit 74 at the contact end of its contact and the switch spindle 4 can be set so that when the isolating load switch is in the closed state, the protruding part of the cam 71 on the switch spindle 4 just comes into contact with the extrusion unit 74. In this way, when the worker needs to close the isolating load switch through the operating mechanism 6, as long as the contact signal transmitted by the contact limit switch is received, it can be clearly and accurately known that the isolating load switch has completed the closing operation at this time. On the contrary, if the contact limit switch does not transmit the contact signal, it means that the isolating load switch is in the open state.

[0035] Furthermore, the detection sensor 73 is a contact pressure sensor.

[0036] In the above embodiments, the pressure sensor is a device or apparatus that can sense the pressure signal and convert the pressure signal into a usable output electrical signal according to a certain rule. The contact pressure sensor of this application can preferably be a piezoresistive pressure sensor.

[0037] In this application, in addition to the setting method in the previous embodiment for the distance between the extrusion unit 74 of the pressure sensor and the switch main shaft 4, the distance between the extrusion unit 74 of the pressure sensor and the switch main shaft 4 can also be set to satisfy the condition that during the rotation of the cam 71, it can come into contact with the outer surface of any area of the cam 71. Since the distances from different areas of the outer surface of the cam 71 to the center point are different, during the rotation of the cam 71, when different outer areas of it come into contact with the extrusion unit 74, the pressures exerted on the extrusion unit 74 will also be different. At this time, the contact end of the contact pressure sensor can be set as an elastic button structure. In this way, during the rotation of the cam 71, when the distance between the cam 71 and the contact pressure sensor changes, the contact end of the contact pressure sensor can adapt to this change and always remain in contact with the protrusion 744 on the rocker arm 742 in the extrusion unit 74. Moreover, the contact of the elastic button structure can smoothly transmit the force on the rocker arm 742 to the contact pressure sensor.

[0038] The pressure sensor can transmit these received different pressure signals to the background monitoring system. Since the rotation angles of the switch main shaft 4 and the cam 71 are different, the forces transmitted by the cam 71 to the main body of the contact pressure sensor through the extrusion unit 74 and the contact end of the contact pressure sensor will be different. These different pressures can be converted into different signals by the contact pressure sensor and output to the monitoring system or the control system. The control system or the monitoring system can process these signals to obtain the specific position of the switch main shaft 4 of the isolating switch (for example, the signal corresponding to the maximum pressure received by the contact pressure sensor is the closing signal of the isolating switch, the signal corresponding to the minimum pressure received by the contact pressure sensor is the signal that the isolating switch is completely separated, and when the pressure received by the contact pressure sensor is between the above two situations, it indicates that the isolating switch is in an intermediate state). In this way, the position state of the isolating switch can be monitored more detailedly and comprehensively.

[0039] The implementation principle of this embodiment is as follows: Whether the worker manually or electrically controls on-site or remotely controls the operating mechanism to close the isolating switch through the background monitoring system, after the operating mechanism 6 is started, it first drives the switch main shaft 4 connected to the operating insulator 3 of the isolating switch to move through the transmission connecting rod 5. When the switch main shaft 4 drives the operating insulator 3 to act, the cam 71 on the main shaft will also move accordingly. When the cam 71 rotates and touches the roller 743 of the extrusion unit 74 installed in the chassis 1, the roller 743 will squeeze the contact end of the detection sensor 73 through the rocker arm 742, so that the detection sensor 73 receives the position signal of the current switch main shaft 4, and finally transmits the signal to the on-site control system or the background monitoring system through the cable, so that the worker can obtain the real-time position state of the isolating switch.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An isolating load switch, comprising a fixed insulator (2) and an operating insulator (3) mounted on a base frame (1), characterized in that: The lower end of the operating insulator (3) is fixedly connected to a switch main shaft (4), the switch main shaft (4) is connected to the upper end of a transmission connecting rod (5), and the lower end of the transmission connecting rod (5) is connected to an operating mechanism (6); Part of the structure of the switch main shaft (4) and the transmission connecting rod (5) are both located in the same sub-rod of the base frame (1); a position detection mechanism (7) is provided on the side of the switch main shaft (4) away from the transmission connecting rod (5), and the position detection mechanism (7) is installed in the sub-rod of the base frame (1) where the switch main shaft (4) is located; the position detection mechanism (7) can detect the position information of the switch main shaft (4) when the switch main shaft (4) moves.

2. The isolating load switch according to claim 1, characterized in that: The position detection mechanism (7) comprises a cam (71) sleeved on the switch main shaft (4); a mounting box (72) is provided on the side of the cam (71) away from the transmission connecting rod (5); the mounting box (72) and the switch main shaft (4) are mounted in the same sub-rod member on the base frame (1); a detection sensor (73) is provided in the mounting box (72); a contact end of the detection sensor (73) is located outside the mounting box (72) and faces the switch main shaft (4); a pressing unit (74) is provided on one side of the contact end of the detection sensor (73); the cam (71) can apply force to the contact end of the detection sensor (73) through the pressing unit (74).

3. The isolating load switch according to claim 2, characterized in that: The extrusion unit (74) comprises a fixed bracket (741), the fixed bracket (741) is fixedly mounted on the detection sensor (73) and is located on one side of the contact end of the detection sensor (73); the fixed bracket (741) is hinged to one end of a rocker arm (742) on the side close to the cam (71); the other end of the rocker arm (742) is rotatably connected to a roller (743); the rocker arm (742) is arranged to be tilted upward, and a protrusion (744) is provided on the side of the rocker arm (742) close to the contact end of the detection sensor (73).

4. The isolating load switch according to claim 3, characterized in that: A torsion spring is provided on the rotating shaft connecting the rocker arm (742) and the fixed bracket (741).

5. The isolating load switch according to claim 2, characterized in that: The cam (71) consists of two parts, a left cam (71) and a right cam (71), and the left cam (71) and the right cam (71) are connected together by bolts.

6. The isolating load switch according to any one of claims 2 to 5, characterized in that: The detection sensor (73) is a contact type limit switch.

7. The isolating load switch according to any one of claims 2 to 5, characterized in that: The detection sensor (73) is a contact pressure sensor.

Images