Spring operating mechanism for a three-position switch

Abstract

The present invention discloses a spring operating mechanism for a three-position switch, which includes a mechanism bent plate, an isolating operating shaft and a grounding operating shaft arranged on the mechanism bent plate. A closing and opening spring assembly is connected between the isolating operating shaft and the grounding operating shaft. A first interlocking lever, a first interlocking mechanism and a second interlocking mechanism are also arranged on the mechanism bent plate. One end of the first interlocking lever is provided with a coupling, and the other end is fixedly connected with an interlocking push plate. The isolating operating shaft and the grounding operating shaft are respectively connected with the coupling through a first crank-link mechanism and a second crank-link mechanism. The interlocking push plate is used to trigger the first interlocking mechanism to block the isolating operation hole or trigger the second interlocking mechanism to block the grounding operation hole. The present invention is provided with an interlocking mechanism. The isolating operating shaft or the grounding operating shaft drives the first interlocking lever to rotate through the crank-link mechanism and the coupling, so as to drive the interlocking push plate to trigger the second interlocking mechanism or the first interlocking mechanism, realizing the locking of the grounding operation hole or the isolating operation hole, thereby avoiding misoperation.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical equipment, and particularly relates to a spring operating mechanism for a three-position switch. Background Art

[0002] Currently, in existing high-voltage switch cabinets, three-position switches with different structures are equipped, and the corresponding operating mechanisms are also various: there are slow transmission mechanisms driven by gears, single-spring independent operating mechanisms, and double-spring double-operating shaft operating mechanisms. Many distribution cabinets require that the earthing switch must have the closing ability, and it is required that the disconnector and the earthing switch of the three-position switch have their respective operating holes. At present, in the prior art, since there is no reliable locking mechanism between the closing position and the opening position and between the opening position and the earthing position of the operating mechanism of the three-position switch, it is very easy to have misoperations during the working process, and the opening and closing operations cannot be carried out reliably. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the present invention provides a spring operating mechanism for a three-position switch, which is used to solve the problem that the operating mechanism of the existing three-position switch does not have a reliable locking mechanism.

[0004] The content of the present invention is as follows:

[0005] A spring operating mechanism for a three-position switch includes a mechanism bending plate, a disconnector operating shaft and an earthing operating shaft arranged on the mechanism bending plate. A closing-opening spring assembly is connected between the disconnector operating shaft and the earthing operating shaft. A first locking rod, a first locking mechanism and a second locking mechanism are also arranged on the mechanism bending plate. One end of the first locking rod is provided with a coupling, and the other end is fixedly connected with a locking push plate. The disconnector operating shaft and the earthing operating shaft are respectively connected with the coupling through a first crank-link mechanism and a second crank-link mechanism. The locking push plate is used to trigger the first locking mechanism to block the disconnector operating hole or trigger the second locking mechanism to block the earthing operating hole.

[0006] Preferably, the first locking mechanism and the second locking mechanism have the same structure. The first locking mechanism includes a locking plate and a locking support plate. A guide pin is arranged on the locking support plate, and a chute matching the guide pin is arranged on the locking plate. The locking plate is installed on the locking support plate, and a return spring is connected between the locking plate and the locking support plate. The locking support plate is installed on the mechanism bending plate.

[0007] Preferably, rotation limiting pins are arranged on both the disconnector operating shaft and the earthing operating shaft, and limiting blocks matching the rotation limiting pins are arranged on the mechanism bending plate and in the rotation directions of the disconnector operating shaft and the earthing operating shaft.

[0008] Preferably, the coupling includes a stainless steel shaft and a triangular dial plate welded together. One end of the stainless steel shaft is connected to the main shaft of the three-position switch, and the other end is connected to the first interlocking rod.

[0009] Preferably, a copper sleeve is sleeved on the outer wall of the stainless steel shaft, and a Y-shaped sealing ring is arranged between the copper sleeve and the stainless steel shaft.

[0010] Preferably, the first crank-link mechanism includes an isolating crank arm plate and an isolating link fixed at one end of the isolating operating shaft. One end of the isolating link is provided with a first arc-shaped chute, and the other end is connected to the upper corner of the triangular dial plate. The isolating crank arm plate is connected to the first arc-shaped chute.

[0011] Preferably, the second crank-link mechanism includes a grounding crank arm plate and a grounding link fixed at one end of the grounding operating shaft. One end of the grounding link is provided with a second arc-shaped chute, and the other end of the grounding link is connected to the lower corner of the triangular dial plate. The grounding crank arm plate is connected to the second arc-shaped chute.

[0012] Preferably, a microswitch support plate is arranged on the mechanism bending plate. A microswitch distributed around the first interlocking rod is arranged on the microswitch support plate. The microswitch is used to control the on-off of the power supply of the motor to achieve electrical interlocking. A microswitch pressing block for triggering the microswitch is arranged on the first interlocking rod.

[0013] Preferably, the opening and closing spring assembly includes a guiding assembly and an opening and closing spring. The guiding assembly includes a guiding rod and a guiding sleeve. The opening and closing spring is sleeved on the outer wall of the guiding assembly. Spring push pins are arranged at both ends of the guiding assembly. A spring push plate is hinged on the spring push pin. The guiding assembly is connected to the isolating operating shaft and the grounding operating shaft respectively through the spring push plate.

[0014] The beneficial effects of the present invention are as follows: The isolating switch and the grounding switch of the three-position switch of the present invention have their respective operating holes; The present invention is provided with an interlocking mechanism. The isolating operating shaft or the grounding operating shaft drives the first interlocking rod to rotate through the crank-link mechanism and the coupling, so as to drive the interlocking push plate to trigger the second interlocking mechanism or the first interlocking mechanism, realize the locking of the grounding operating hole or the isolating operating hole, and thus avoid misoperation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The overall structure of the embodiment of the present invention is shown Figure 1 ;

[0016] Figure 2 The front view of the embodiment of the present invention is shown;

[0017] Figure 3The overall structure of the embodiment of the present invention is shown Figure 2 ;

[0018] Figure 4 The right view of the embodiment of the present invention is shown. Detailed implementation manners

[0019] The above description is only an overview of the technical solution of the present invention. In order to understand the technical means of the present invention more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable, the following preferred embodiments are specifically given, and in conjunction with the accompanying drawings, the details are described as follows.

[0020] Please refer to Figure 1 , a spring operating mechanism of a three-position switch disclosed in this embodiment includes a mechanism bent plate 1, an isolating operating shaft 2 and a grounding operating shaft 3 arranged on the mechanism bent plate 1. A closing and opening spring assembly 4 is connected between the isolating operating shaft 2 and the grounding operating shaft 3. A first interlocking lever 5, a first interlocking mechanism 16 and a second interlocking mechanism 17 are further arranged on the mechanism bent plate 1. The first interlocking lever 5 is a hexagonal interlocking lever or an octagonal interlocking lever. In this embodiment, a hexagonal interlocking lever is adopted. One end of the first interlocking lever 5 is provided with a coupling 8, and the other end is fixedly connected with an interlocking push plate 9. The isolating operating shaft 2 and the grounding operating shaft 3 are respectively connected with the coupling 8 through a first crank-link mechanism 6 and a second crank-link mechanism 7. The interlocking push plate 9 is used to trigger the first interlocking mechanism 16 to block the isolating operation hole or trigger the second interlocking mechanism 17 to block the grounding operation hole. The isolating operation hole is used to insert an operation handle and rotate the isolating operating shaft 2 through the operation handle, and the grounding operation hole is used to insert an operation handle and rotate the grounding operating shaft 3 through the operation handle. Compared with the existing operating mechanism, the disconnector and the earthing switch in this embodiment have their own operation holes and the output shaft is omitted, which is beneficial to simplifying the structure and realizing the miniaturization of the spring operating mechanism.

[0021] Please refer to Figure 1 , in this embodiment, the mechanism bent plate 1 is a sheet metal part with a U-shaped cross section. Mechanism covers 10 are arranged on both sides of the U-shaped opening of the sheet metal. The isolating operating shaft 2 and the grounding operating shaft 3 are respectively arranged at the upper part and the lower part of the mechanism bent plate 1. Rotation limiting pins 11 are arranged on both the isolating operating shaft 2 and the grounding operating shaft 3. Limiting blocks 12 matching with the rotation limiting pins 11 are arranged on the mechanism bent plate 1 and in the rotation directions of the isolating operating shaft 2 and the grounding operating shaft 3.

[0022] Please refer to Figure 2, the separating and combining spring assembly 4 includes a guiding assembly 41 and a separating and combining spring 42. The guiding assembly 41 includes a guiding rod and a guiding sleeve. The separating and combining spring 42 is sleeved on the outer wall of the guiding assembly 41. Spring push pins 43 are arranged at both ends of the guiding assembly 41. A spring push plate 44 is hinged to the spring push pin 43. The guiding assembly 41 is fixed to the isolating operating shaft 2 and the grounding operating shaft 3 respectively through the spring push plate 44.

[0023] Please refer to Figure 3 , the first crank-link mechanism 6 includes an isolating crank arm plate 61 fixed to the end of the isolating operating shaft 2 away from the isolating operating hole and an isolating link 62. One end of the isolating link 62 is provided with a first arc-shaped chute, and the other end is connected to the coupling 8. The isolating crank arm plate 61 is connected to the first arc-shaped chute through a connecting pin.

[0024] The second crank-link mechanism 7 includes a grounding crank arm plate 71 fixed to the end of the grounding operating shaft 3 away from the grounding operating hole and a grounding link 72. One end of the grounding link 72 is provided with a second arc-shaped chute, and the other end is connected to the coupling 8. The grounding crank arm plate 71 is connected to the second arc-shaped chute through a connecting pin.

[0025] The coupling 8 includes a stainless steel shaft 81 and a triangular dial plate 82 welded together. The upper corner of the triangular dial plate 82 is hinged to the isolating link 62, and the lower corner of the triangular dial plate 82 is hinged to the grounding link 72. A copper sleeve is sleeved on the outer wall of the stainless steel shaft 81. A Y-shaped sealing ring is arranged between the copper sleeve and the stainless steel shaft 81. One end of the stainless steel shaft 81 is connected to the main shaft of the three-position switch through a first hexagonal hole 83, and the other end is connected to the first interlocking rod 5 through a second hexagonal hole.

[0026] A microswitch pressing block 13 is arranged on the first interlocking rod 5. A microswitch supporting plate 14 is arranged on the mechanism bending plate 1. Three microswitches 15 distributed around the microswitch pressing block 13 are arranged on the microswitch supporting plate 14. When the spring operating mechanism switches among the three positions of connection, isolation and grounding, the first interlocking rod 5 drives the microswitch pressing block 13 to trigger the three microswitches 15 respectively. The three microswitches 15 send out signals respectively to cut off the power supply of the motor, realizing electrical interlocking.

[0027] Please refer to Figure 1Or 4, the interlocking push plate 9 is fixed to one end of the first interlocking rod 5 away from the coupling 8. The first interlocking mechanism 16 and the second interlocking mechanism 17 are respectively opposite to the upper and lower parts of the interlocking push plate 9, and the first interlocking mechanism 16 and the second interlocking mechanism 17 have the same structure. The first interlocking mechanism 16 includes an interlocking plate 161 and an interlocking support plate 162. Two guide pins 163 are arranged on the interlocking support plate 162. A chute matching the guide pins 163 is arranged on the interlocking plate 161. The interlocking plate 161 is installed on the interlocking support plate 162, and a return spring 164 is connected between the interlocking plate 161 and the interlocking support plate 162. The interlocking support plate 162 is installed on the mechanism bent plate 1.

[0028] The working principle of this embodiment is as follows:

[0029] Please refer to Figure 1 , when the three-position switch needs to perform an isolating closing operation, insert the operating handle into the isolating operation hole. Drive the isolating operation shaft 2 to rotate counterclockwise through the operating handle. On the one hand, the isolating operation shaft 2 drives the coupling 8 to rotate synchronously counterclockwise through the first crank-link mechanism 6. On the other hand, it drives the grounding operation shaft 3 to rotate clockwise through the opening and closing spring assembly 4, so as to realize the isolating closing operation. When rotating the isolating operation shaft 2, the coupling 8 drives the interlocking push plate 9 to rotate counterclockwise through the first interlocking rod 5. The interlocking push plate 9 pushes the interlocking plate of the second interlocking mechanism 17 to block the grounding operation hole. At this time, the operating handle cannot be inserted into the grounding operation hole, which can avoid misoperation. At this time, perform an isolating opening by rotating the isolating operation shaft 2 in the reverse direction. The interlocking push plate 9 resets, and the interlocking plate of the second interlocking mechanism 17 resets under the pulling force of the return spring. At this time, the operating handle can be inserted into the grounding operation hole to perform a grounding closing operation.

[0030] The above is only a preferred embodiment of the present invention. The present invention is not limited to the above embodiments. As long as it achieves the technical effects of the present invention by the same means, it should fall within the protection scope of the present invention. Within the protection scope of the present invention, various modifications and changes can be made to its technical solutions and / or implementation manners.

Claims

1. A spring operating mechanism for a three-position switch, comprising a mechanism bent plate (1), an isolating operating shaft (2) and a grounding operating shaft (3) arranged on the mechanism bent plate (1), and a closing and opening spring assembly (4) is connected between the isolating operating shaft (2) and the grounding operating shaft (3), characterized in that: A first linkage rod (5), a first interlocking mechanism (16) and a second interlocking mechanism (17) are further provided on the mechanism bending plate (1). One end of the first linkage rod (5) is provided with a coupling (8), and the other end is fixedly connected with an interlocking push plate (9). The isolation operating shaft (2) and the grounding operating shaft (3) are respectively connected with the coupling (8) through a first crank-link mechanism (6) and a second crank-link mechanism (7). The interlocking push plate (9) is used to trigger the first interlocking mechanism (16) to block the isolation operation hole or trigger the second interlocking mechanism (17) to block the grounding operation hole; The first interlocking mechanism (16) and the second interlocking mechanism (17) have the same structure. The first interlocking mechanism (16) includes an interlocking plate (161) and an interlocking support plate (162). A guide pin (163) is provided on the interlocking support plate (162), and a chute matching the guide pin (163) is provided on the interlocking plate (161). The interlocking plate (161) is installed on the interlocking support plate (162), and a return spring (164) is connected between the interlocking plate (161) and the interlocking support plate (162). The interlocking support plate (162) is installed on the mechanism bending plate (1); The opening and closing spring assembly (4) includes a guiding assembly (41) and an opening and closing spring (42). The guiding assembly (41) includes a guiding rod and a guiding sleeve. The opening and closing spring (42) is sleeved on the outer wall of the guiding assembly (41). Spring push pins (43) are provided at both ends of the guiding assembly (41), and a spring push plate (44) is hinged on the spring push pin (43). The guiding assembly (41) is connected with the isolation operating shaft (2) and the grounding operating shaft (3) respectively through the spring push plate (44).

2. The spring operating mechanism of the three-position switch according to claim 1, characterized in that: Rotation limiting pins (11) are provided on both the isolation operating shaft (2) and the grounding operating shaft (3). Limiting blocks (12) for limiting the rotation limiting pins (11) are provided on the mechanism bending plate (1) and in the rotation directions of the isolation operating shaft (2) and the grounding operating shaft (3).

3. The spring operating mechanism of the three-position switch according to claim 1, characterized in that: The coupling (8) includes a stainless steel shaft (81) and a triangular dial (82) welded together. One end of the stainless steel shaft (81) is connected with the main shaft of the three-position switch, and the other end is connected with the first linkage rod (5).

4. The spring operating mechanism of the three-position switch according to claim 3, characterized in that: A copper sleeve is sleeved on the outer wall of the stainless steel shaft (81), and a Y-shaped sealing ring is provided between the copper sleeve and the stainless steel shaft (81).

5. The spring operating mechanism of the three-position switch according to claim 3, characterized in that: The first crank-link mechanism (6) includes an isolation crank arm plate (61) fixed at one end of the isolation operating shaft (2) and an isolation connecting rod (62). One end of the isolation connecting rod (62) is provided with a first arc-shaped chute, and the other end is connected with the upper corner of the triangular dial (82). The isolation crank arm plate (61) is connected with the first arc-shaped chute.

6. The spring operating mechanism of the three-position switch according to claim 3 or 5, characterized in that: The second crank-link mechanism (7) includes a grounding crank arm plate (71) fixed to one end of the grounding operation shaft (3) and a grounding connecting rod (72). One end of the grounding connecting rod (72) is provided with a second arc-shaped chute, and the other end of the grounding connecting rod (72) is connected to the lower end corner of the triangular dial plate (82). The grounding crank arm plate (71) is connected to the second arc-shaped chute.

7. The spring operating mechanism of the three-position switch according to claim 1, characterized in that: A microswitch support plate (14) is provided on the mechanism bending plate (1). A microswitch (15) distributed around the first interlocking rod (5) is provided on the microswitch support plate (14). The microswitch (15) is used to control the on-off of the power supply of the motor to achieve electrical interlocking. A microswitch pressing block (13) for triggering the microswitch (15) is provided on the first interlocking rod (5).

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