WO2011072541A1

WO2011072541A1 - Electric operation mechanism for switchgear

Info

Publication number: WO2011072541A1
Application number: PCT/CN2010/077127
Authority: WO
Inventors: 张红军; 邓洪祥
Original assignee: 中国西电电气股份有限公司
Priority date: 2009-12-16
Filing date: 2010-09-20
Publication date: 2011-06-23
Also published as: CN101714472A; CN101714472B; EG26807A; MY163457A

Abstract

An electric operation mechanism used in gas insulated metal-enclosed switchgear (GIS) adopts a gear/cam combined transmission device with a maximum output turn angle of three turns. In the gear/cam combined transmission device, a main shaft (18) is coaxially fixed with a driving fan-shaped gear (11) and a transmission gear (14). A transmission fan-shaped gear (10) is fixed with a driven cam (9) and sleeved on the main shaft (18) with a clearance for synchronously rotating around the main shaft (18). An output shaft (20) is coaxially fixed with a driven gear (22) which is meshed with the transmission fan-shaped gear (10). A driving cam (8) is fixed with a transmission gear (7) and sleeved on the output shaft (20) with a clearance for synchronously rotating around the output shaft (20). The electric operation mechanism also adopts a pair of cams (15, 16) to drive an auxiliary switch (17) to be switched. The auxiliary switch (17) abuts on a driving shaft such that the size of the mechanism is reduced. The electric operation mechanism has good transmission characteristics, small impact forces during starting and being put in place in switching on or switching off, high accuracy of the output turn angle, accurate and reliable location and preservation of being put in place in switching on or switching off.

Description

Electric operating mechanism for switchgear

The invention relates to the field of electric operating mechanisms, in particular to a gas insulated metal-enclosed switchgear

Electric operating mechanism used in (GIS). Background technique

With the continuous development of high-voltage switchgear, some of the isolating switches or grounding switches in the high-voltage switch use the transmission structure as gear/rack or screw/nut, which requires the switch input (mechanical output). The corner of the rotation is multi-turn to meet the needs of the itinerary.

The existing electric operating mechanism capable of realizing multi-turn output, the main transmission structure is a gear transmission device, the output angle accuracy is not high, and the clutch for limiting the transmission torque is used for reducing the impact, and the positioning is used for the opening and closing. A positioning device that combines multiple parts. There are a lot of parts and the quality of the parts, and there are many links in the external supply, processing, assembly and commissioning. As long as there is a slight carelessness and the quality control is not in place, there will be unstable performance or abnormal operation. The phenomenon. A gear/cam joint transmission device with simple structure, excellent performance, stability and reliability is adopted. The active cam of the device is coaxial with the active fan gear, and the driven cam and the driven gear are coaxial, and the output rotation angle is 91. . The active cam, the active fan gear coaxial, the driven cam, the driven gear coaxial gear/cam combined transmission are improved, and the possible output angle of the mechanism can only reach about 3/4 rpm, which can not meet the requirements. Use the input switch with multi-turn isolation switch and grounding switch. A special gear/cam combination transmission has been designed to make the output angle of the mechanism multi-turn, which can meet the requirements of switches requiring multi-turn input. Summary of the invention The object of the present invention is to provide an electric operating mechanism for a switchgear with reliable performance and simple structure, which satisfies the requirements of the isolating switch and the grounding switch in the high voltage (252 kV to l lOO kV) gas insulated metal-enclosed switchgear (GIS). For the need for more than one turn.

In order to achieve the above object, the present invention is achieved by the following technical solutions:

The electric operating mechanism for the switchgear is mainly composed of the movement 1, the mechanism box 2 and the manual operation interlocking device 3, and the movement 1, the manual operation interlocking device 3 is fixed in the mechanism box 2, the movement 1 comprising a mechanism bracket 24, the mechanism bracket 24 is provided with a motor 4, a main shaft 18, an output shaft 20 and an intermediate gear shaft 23, and the motor 4 drives the transmission gear 5 fixed on the intermediate gear shaft 23 through its output gear, and passes through the middle The gear portion 23a on the gear shaft 23 drives the transmission gear 7 on the output shaft 20, and the transmission gear 7 drives the main shaft 18 and the transmission gear 14 on the main shaft 18 and the driving fan gear 11 to rotate; the main shaft 18 passes through the extension end of the extension mechanism bracket 24 A cam 13 attached thereto is driven to switch the micro switch 12 mounted on the mechanism bracket 24, the contacts in the micro switch are electrically connected to the control loop of the motor, and the output shaft 20 extends out of the mechanism bracket 24 The output end is used for connecting and driving the switch operated by the mechanism, and is characterized in that: the other end of the main shaft 18 is fixedly connected with the cam 15 , and the auxiliary bracket 17 is mounted on the mechanism bracket 24 . The rotating shaft of the auxiliary switch 17 is fixedly connected to the cam 16, the cam 15 drives the cam 16 to rotate, and the auxiliary switch 17 is driven to switch. The main shaft 18 and the output shaft 20 are connected and transmitted by the gear/cam combination transmission, and the gear is converted. The cam combined transmission device comprises a main shaft 18 coaxially fixedly coupled with a driving fan gear 11 and a transmission gear 14, the transmission fan gear 10 and the driven cam 9 are fixedly connected and the idle sleeve rotates synchronously around the main shaft 18 on the main shaft 18; the output shaft 20 A driven gear 22 is fixedly coupled to the upper shaft, and the driven gear 22 meshes with the transmission fan gear 10. The active cam 8 and the transmission gear 7 are fixedly coupled and the idle sleeve is synchronously rotated on the output shaft 20 about the output shaft 20.

According to a further technical solution of the present invention, the gear/cam combination transmission device is provided with a limiting device, and the limiting device is disposed inside the driving fan gear 11 and the transmission fan gear 10, and the limiting device is included in the active device. A pin 25 is disposed on the fan gear 11, and an arcuate groove 10a is disposed on the transmission fan gear 10. The two ends of the groove are respectively provided with a limiting member 26 and a rubber pad 27, and the pin 25 is disposed on the transmission fan gear 10. Movement in the arcuate groove 10a. According to a further technical solution of the present invention, the manual operation interlocking device 3 includes an interlocking support 37, and the interlocking rotary electromagnet 32 is fixed on the interlocking support 37 through the mounting plate 38, and the baffle 31 is fixedly connected. On the shaft of the rotary electromagnet 32, the microswitches 28, 30 are fixedly attached to the mounting plate 29 by bolts, and the mounting plate 29 is fixedly coupled to the interlocking abutment 37, the drive plate 36 of the microswitch 28 and the drive plate 36. The return spring 35 is fitted over the pin 40 and rotates around the pin 40; the drive plate 34 of the micro switch 30 and the return spring 33 of the drive plate 34 are fitted over the pin 39 to rotate about the pin 39.

A further technical solution of the present invention further includes the following feature: the transmission fan gear 10 and the driven cam 9 are fixedly connected by a round hole hexagonal sleeve, a spline or a flat key, and the driving cam 8 and the transmission gear 7 pass through a circular hole hexagonal sleeve, The spline or the flat key is fixedly connected; the transmission gear 7 is a driving wheel in the gear/cam combined transmission, and the transmission gear 14 can also be used as a driving wheel, and a gear can be additionally fixedly connected to the main shaft as a driving wheel. The action of the micro switch 28, 30 is controlled by the insertion process of the operating handle, the contacts of the micro switch 28, 30 are electrically connected to the control circuit of the mechanism, and the operation handle 41 is inserted into the process and manually operated, and is timely turned on. Or disconnect the relevant electrical circuit to achieve interlocking and anti-misoperation.

Compared with the conventional electric operating mechanism, the invention has the advantages that: the special gear/cam combined transmission mode with simple structure, few parts, multi-function and few transmission links is adopted, the transmission loss is small, the efficiency is high, and the transmission characteristics are excellent. The splitting, closing and starting impact force is small, the precision of the output angle of the mechanism is high, and the positioning and keeping of the split and closing positions are accurate and reliable, which simplifies the structure of the mechanism and reduces the size of the mechanism.

The invention adopts the special gear/cam combination transmission and conversion mode of the innovative design, so that the output angle of the original gear/cam combined transmission can only reach about 3/4 to be converted into an output angle close to three revolutions, which can meet the high pressure. (252 kV ~ 1100 kV) The isolation switch and grounding switch in the GIS switchgear require multi-turn input.

The present invention utilizes an innovative limit device that does not occupy additional space, making the structure of the mechanism transmission more compact and smaller in size.

The present invention employs a pair of cam-driven auxiliary switches, the number of transmission parts of the transmission parts that achieve the same function is lower than that of any type of mechanism, has been reduced to a minimum limit number, and the auxiliary switch can be closely spaced with its drive shaft. , the size of the mechanism can be reduced, and the cam is a flat cam with a simple structure. Easy processing, precise transmission and positioning, and reliable performance. By changing the position of the two teeth of the cam, it is very convenient to switch the auxiliary switch at any desired position. This is difficult to achieve with other transmission methods. This transmission mode also improves the speed of movement of the rotating shaft and the contact when the auxiliary switch is switched, and the breaking performance can be improved.

The invention adopts the newly designed manual interlocking device, has reasonable structure and perfect interlocking function, and is simpler in operation and more reliable in structure than the existing multi-rotation output electric mechanism, especially the number of parts used for mechanism locking is reduced. Several times, the structure is greatly simplified, and the cost reduction is very obvious. DRAWINGS

Figure 1 is a schematic view showing the overall arrangement of the mechanism of the present invention;

Figure 2 is a schematic view showing the overall arrangement of the movement portion of the mechanism of the present invention;

Figure 3 is a schematic view of the transmission system of the mechanism movement part;

Figure 4 is a schematic diagram of the opening action of the gear/cam combination transmission between the main shaft and the output shaft; Figure 4a shows the start cam transmission phase; Figure 4b shows the gear transmission phase; Figure 4c shows the opening close to the cam transmission phase; Figure 4d shows The opening position after the end of the action;

Figure 5 is a schematic view of the mechanism limiting device;

6 is a schematic diagram of the process of closing the auxiliary switch; FIG. 6a is the gear transmission phase of the 15a tooth of the cam 15 and the 16b tooth and the 16c tooth of the cam 16; FIG. 6b is the end of the transmission of FIG. 6a, the cam 15 continues to rotate, and the cam 16 does not rotate. Figure 6c shows the 15b tooth of the cam 15 and the 16d tooth of the cam 16 and the 16e tooth contact transmission phase; Figure 6d shows the closing position after the end of the action;

Figure 7 is a schematic view of the mechanism manual operation interlocking device;

Fig. 7a is a front view, Fig. 7b is a left side view, and Fig. 7c is a top view (cross-sectional view).

Figure 8 is a schematic diagram of manual operation;

Figure 9 is a schematic diagram of the mechanism lockout.

Reference mark:

1 - movement; 2- mechanism box; 2a-ventilation window; 2b-connector; 2c-connector; 2d-divide, joint position-

2e-protective cover; 3-manual operation interlocking device; 4-motor;

5-transmission gear; 6-manual gear shaft; 7-transmission gear;

8-active cam; 9-driven cam; 10-transmission fan gear;

10a-drive fan gear 10 11-active fan gear; 12-micro switch;

Curved groove in the middle;

13-cam; 14-transmission gear; 15-cam;

16-cam; 18-spindle; 19-terminal block;

20-output shaft; 21-drive heater; 22-driven gear;

23-internal gear shaft; 23a-tooth on the intermediate gear shaft 24-mechanism bracket;

Wheel part

25-pin; 26-limit member; 27-rubber pad;

28-micro switch SP2; 29-mounting plate; 30-micro switch SP1

31-baffle; 32-rotary electromagnet; 33-spring;

34-drive board; 35-spring; 36-drive board;

37-interlocking support; 38-mounting plate; 39-pin;

40-pin; 41-operating handle; 42-locking lever;

43-padlock; 15a, 15b-cam 15 15a tooth, 15b tooth;

16a, 16b, 16c, 16d, 16e, 16f - 16a teeth, 16b teeth, 16c teeth, 16d teeth, 16e teeth, 16f teeth of the cam 16. detailed description

The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

As shown in FIG. 1, the present invention is mainly composed of a movement 1, a mechanism box 2 and a manual operation interlocking device 3, and the movement 1, the manual operation interlocking device 3 is fixed in the mechanism box 2, and on the mechanism box 2 a ventilating window 2a for ventilating inside and outside the box, for connecting the connectors 2b, 2c introduced by the electrical connection wires of the mechanism, Split and close position indicator 2d, manually operate the protective cover 2e of the interlock.

In this embodiment, the output shaft of the mechanism is turned to: counterclockwise, and closing is clockwise. As shown in Figure 4. As shown in Fig. 2 and Fig. 3, the mechanism movement portion includes a cast aluminum mechanism bracket 24, and the mechanism bracket 24 is provided with a main shaft 18, an output shaft 20, and an intermediate gear shaft 23. The main shaft is switched at one end of the extension mechanism bracket 24 by two cams 12 mounted on the mechanism bracket 24 via a cam 13 of a driving micro switch fixed thereto, and the contacts in the micro switch are electrically connected to the motor. Control loop. A cam 15 fixedly coupled to the other end of the main shaft (inside of the mechanism bracket 24) drives a cam 16 fixedly coupled to the rotating shaft of the auxiliary switch 17 mounted on the mechanism bracket 24 to drive the auxiliary switch 17 to switch.

As shown in Fig. 2 and Fig. 3, a motor 4 is disposed in the upper left corner of the mechanism bracket 24, and the motor 4 drives the transmission gear 5 fixed on the intermediate gear shaft 23 through its output gear, and is driven by the gear portion 23a in the intermediate gear shaft 23. The transmission gear 7 on the output shaft 20 is output. The transmission gear 7 drives the main shaft 18 and the transmission gear 14 on the main shaft 18 and the driving fan gear 11 to rotate; thereafter, the mechanism main shaft 18 and the output shaft 20 are connected to each other through a specially designed special gear/cam combination transmission. Conversion. The output shaft 20 extends out of the mechanism bracket 24 and is used for connection and transmission with the mechanism operated switch.

As shown in FIG. 2, FIG. 3 and FIG. 4, the gear/cam combination transmission device comprises a transmission gear 7, an active cam 8, a driven cam 9, a transmission fan gear 10, a driving fan gear 11, a transmission gear 14, and a main shaft 18. The output shaft 20 and the driven gear 22 are composed. An active fan gear 11 and a transmission gear 14 are coaxially fixedly coupled to the main shaft 18, and the transmission fan gear 10 and the driven cam 9 are fixedly coupled together by a circular hole hexagonal sleeve and the idle sleeve is synchronously rotated around the main shaft 18 on the main shaft 18; A driven gear 22 is coaxially fixedly coupled to the output shaft 20. The active cam 8 and the transmission gear 7 are fixedly coupled together by a circular hexagonal sleeve and the idle sleeve is synchronously rotated on the output shaft 20 about the output shaft 20. During the splitting and closing process, the spindle 18 and the output shaft 20 are driven and converted by the above-designed gear/cam combination transmission, and the spindle 18 is brought close to 340. The rotation and the driven cam 9, the rotation of the transmission fan gear 10 slightly larger than 3/4 turns is converted into the rotational output of the output shaft 20 by nearly three turns.

As shown in Figure 5, the gear/cam combination transmission of the movement is also equipped with innovative design limits. The position device is disposed inside the adjacent active fan gear 11 and the transmission fan gear 10 without additional space. The limiting device comprises a pin 25 disposed on the driving fan gear 11, an arc-shaped groove 10a disposed on the driving fan gear 10, and a limiting member 26 and a rubber pad 27 respectively disposed at two ends of the groove. The pin 25 provided on the driving fan gear 11 moves in the arcuate groove 10a on the transmission fan gear 10. When the ball is engaged or disengaged, the driven cam 9 and the transmission fan gear 10 are bidirectionally restricted by the active cam 8 at both ends D, and the main fan gear 11 and the main shaft 18 are rotated until the pin 25 is in contact with the limiting member 26 The limit is forcibly stopped. Under normal circumstances, the splitting and closing are in place, and the inertial rotation after the motor 4 is powered off should stop before the pin 25 on the driving fan gear 11 hits the limiting member 26 in the arcuate groove 10a on the transmission fan gear 10. . If the motor 4 has an uninterrupted power failure, the motor 4 is turned to an error and cannot be powered off, or the manual operation does not pay attention to the excessive rotation of the handle, the limit device will function.

As shown in Fig. 2 and Fig. 6, the movement switching of the movement part auxiliary switch 17 is completed by the two newly designed cams 15, 16. During the splitting and closing process, the cam 15 fixedly coupled to the main shaft 18 drives the cam 16 fixedly coupled to the rotating shaft of the auxiliary switch 17 mounted on the mechanism bracket 24 to rotate, and the auxiliary switch 17 is switched. The cam 15 and cam 16 are similar in shape to the intermittent gear, but are not designed according to the tooth profile and modulus of the gear. They are two special cams that have the function of driving the auxiliary switch 17 to switch and move in position to achieve positioning.

As shown in FIG. 1 , FIG. 2 , FIG. 7 , FIG. 8 and FIG. 9 , a newly designed manual operation interlocking device 3 is further disposed between the mechanism bracket 24 at the lower left portion of the mechanism and the mechanism box 2 , and includes: a mechanism box 2 An interlocking support 37 is fixed to the mounting hole of the manual gear shaft 6 at the inner side, and the interlocking rotary electromagnet 32 is fixed on the interlocking support 37 through the mounting plate 38, and the baffle 31 is fixedly connected to the rotating electromagnet. On the shaft, the micro switches 28, 30 are fixedly connected to the mounting plate 29 by bolts, and the mounting plate 29 is fixedly coupled to the interlocking bracket 37, and the driving plate 36 of the micro switch 28 and the return spring 35 of the driving plate 36 are fitted On the pin 40, the pin 40 is rotated together; the drive plate 34 of the micro switch 30 and the return plate 33 of the drive plate 34 are fitted over the pin 39 and rotated together around the pin 39. The mechanism of the invention is provided with a special operating handle 41, and the front end of the handle has a small diameter, and a tapered surface with a taper degree is transitioned to a long rod portion matching the diameter of the inner hole of the interlocking support 37, and a rear end of the long rod is provided with a rocking handle. And the handle. The front end of the handle has a hand The hexagonal hole of the six-way hexagonal end of the moving gear shaft 6 is used. The mechanism is also provided with a dedicated locking lever 42 having a length of 4 inches short, which has two left and right shifted slopes on the left and right sides as shown in FIG.

How the organization works:

As shown in FIG. 3, when the motor is manually or manually opened, the motor 4 is energized or manually operated by the operating handle, so that the output gear of the motor 4 and the manual gear shaft 6 rotate counterclockwise, and the transmission gear 5 on the intermediate gear shaft 23 is driven to rotate, and The transmission gear 7 on the output shaft 20 is driven to rotate by the gear portion 23a on the intermediate gear shaft 23, and the transmission gear 7 on the output shaft 20 drives the main shaft 18 and the transmission gear 14 on the main shaft 18 and the driving fan gear 11 to rotate clockwise. The cam 13 that drives the microswitch 12 connected to the main shaft 18 and the cam 15 that drives the auxiliary switch 17 also rotate in the same direction. Between the main shaft 18 and the output shaft 20, the transmission and output angle conversion are completed by a specially designed special gear/cam combination transmission.

The principle of transmission and output angle conversion of the gear/cam combination transmission is as follows:

As shown in FIG. 3 and FIG. 4, the transmission fan gear 10 retains 4 more teeth than the active fan gear 11, so that the active fan gear 11 can be smoothly disengaged from the driven gear 22 in the starting section and the in-position section of the transmission, and the transmission fan The gear 10 remains engaged with the driven gear 22 at any position that the mechanism can reach to ensure that the driven cam 9 that is moved by the output shaft 20 on the main shaft 18 and the driven gear 22 and the output shaft 20 are always maintained - Corresponding accurate position, and the rotation of the output shaft 20 at a relatively fast rotation speed is converted into a synchronous rotation of the driven gear 9 at a slower speed by the transmission of the driven gear 22 and the transmission fan gear 10. Through the meshing transmission of the transmission gear 14 with the same number of teeth and the transmission gear 7, the main shaft 18, the active fan gear 11 and the active cam 8 moved from the main shaft 18 to the output shaft 20 are always maintained - corresponding accurate position and equal speed Rotate synchronously. In the gear/cam combination transmission of the present invention, the transmission gear 7 is the drive wheel of the apparatus which is the most forward in the transmission chain of the mechanism. The displacement between the active cam 8 and the driven cam 9 is based on the original conventional gear/cam combined transmission. This is the special feature of this transmission.

As shown in FIG. 4, the active cam 8 has an equal radius arc on both sides of the convex portion in the radial direction, a partial convex portion F in the middle, and a portion near the partial convex portion F gradually protrudes from the both sides to the middle. . At the start of the cam drive phase at start-up, the drive gear 7 of the device directly drives the active cam 8 to reverse When the hour hand rotates, the main and driven cams slide on the arc of equal radius, the active cam 8 idles, and the driven cam 9, the transmission fan gear 10, the driven gear 22, and the output shaft 20 do not rotate. Rotating to the non-equal radius portion of the active cam 8 which gradually protrudes outward, the driving cam 8 slides and pushes the driven cam 9, and sequentially transmits the driven driven cam 9, the transmission fan gear 10, the driven gear 22, and the output shaft 20 with respect to The main shaft 18, the driving fan gear 11 and the driving cam 8 rotate from slow to fast. When the speed of the driven gear 22 accelerates to the cam transmission is very close to the speed ratio of the gear transmission, the starting section cam transmission force of FIG. 4a is converted into a diagram. 4b gear drive. There is no obvious impact when starting and switching. When the starting section and the in-position section are cam-driven, the driving fan gear 11 and the driven gear 22 are disengaged, and the transmission gear 14, the main shaft 18, and the driving fan gear 11 are idling. When the cam is driven, the main shaft 18 and the driving fan gear 11 are not synchronized with the driving fan gear 10 and the driven cam 9 (Fig. 4a, 4c, 4d). When the gear is driven, the above four parts rotate synchronously at the same speed, the active fan gear 11 Align with the corresponding teeth of the drive fan gear 10, as shown in Figure 4b. The output shaft angle of the gear drive accounts for the majority (close to 97% of the total output angle), and the cam drive output shaft angles of the start and the end segments are small (both less than 2% of the total output angle). In the gear transmission, the driving gear 7 of the device sequentially transmits the driving transmission gear 14, the main shaft 18, the driving fan gear 11, the driven gear 22, the output shaft 20 to rotate and output, and the driven gear 22 drives the transmission fan gear 10 and the slave gear. The moving cam 9 is idling on the main shaft 18. When the gear transmission ends, the driving fan gear 11 and the driven gear 22 are automatically disengaged. Referring to FIG. 4c, the front end E of the driving cam 8 is in contact with the corresponding position of the driven cam 9, and the sliding pressing driven cam 9 is sequentially driven to drive the driven. The cam 9, the drive fan gear 10, the driven gear 22, and the output shaft 20 rotate, and the transmission is converted into a cam drive of the vicinity of the position of Fig. 4c. The cam drive is closed to the position of the output shaft 22, and the cam 13 pushes the micro switch 12 on the opening side to switch, and the motor 4 is powered off. The motor 4 to the main shaft 18, the driving fan gear 11, and the driving cam 8 continue to rotate due to inertia, and the driving cam 8 pushes the output shaft 20 to the position by the driven cam 9 or the like. Thereafter, the driven cam 9, the transmission fan gear 10, the driven gear 22, and the output shaft 20 are no longer rotated, and the motor 4 to the main shaft 18, the driving fan gear 11, and the driving cam 8 continue to rotate inertially to the limit position of the design control. The position is stopped and the entire transmission that has reached the end of the action of Figure 4d is opened to the position. After the opening is in place, the two short arcs at the ends of the notch of the driven cam 9 are bidirectionally restricted by C and D at equal sides of the active cam 8, respectively, and the output shaft is output. 20 The main contact of the mechanism-driven switch is accurately and reliably positioned at the position required by the design. Since the driven gear 22 has a large gear ratio with the driving fan gear 11 and the transmission gear 10, the spindle 18 and the proximal gear 340 of the driving fan gear 11 can be realized. The rotation and follower cam 9, the drive fan gear 10 is slightly larger than 3/4 turn (the maximum output angle that the conventional gear/cam joint drive can reach) and the output shaft 20 is converted to the output of the output shaft 20. Appropriate design of the shape and size of the active cam 8 and the driven cam 9 can achieve precise corner output (error less than ± 0.3%), reliable and stable closing and closing positioning, and fully limit the function of reducing the impact force at the start and the position. .

As described above, when the output shaft 20 is in the vicinity of the opening, the cam 13 of the driving micro switch fixedly coupled to the main shaft 18 drives the micro switch 12 mounted on the mechanism bracket 24 to switch, and the contact in the micro switch is cut. The brake control circuit, the opening contactor operates, and the motor circuit is cut off.

As shown in Fig. 6, the switching of the movement of the movement portion auxiliary switch 17 is completed by the two newly designed cams 15, 16. During the splitting and closing process, the cam 15 fixedly coupled to the main shaft 18 drives the cam 16 fixedly coupled to the rotating shaft of the auxiliary switch 17 mounted on the mechanism bracket 24 to rotate, and the auxiliary switch 17 is switched. In the opening position, the 16a tooth and the 16b tooth of the cam 16 are located at a position symmetrical with the radius arc portion of the cam 15 and symmetrical with respect to Fig. 6d, the initial portion of the closing action, the cam 15 is rotated, and the cam 16 is not rotated. The cam 15 rotates through a certain angle and reaches the transmission phase of FIG. 6a. The front end of the 15a tooth of the cam 15 and the rear end of the equal radius arc respectively drive the 16b tooth and the 16c tooth of the cam 16 to rotate, and the auxiliary switch 17 is switched for the first time. , Disconnect the normally closed contact. Subsequently, entering the transmission phase of Fig. 6b, the cam 15 continues to rotate. The cam 16 does not rotate due to its radius of the 16c teeth, 16d teeth approaching the cam 15, and the like, this stage occupies most of the corner of the cam 15. Continue to move to the transmission phase of Figure 6c, the 15b tooth of the cam 15 and the rear end of the equal-radius arc, respectively drive the 16d tooth and the 16e tooth of the cam 16 to rotate, and drive the auxiliary switch 17 to switch for the second time. head. The operation is continued until the closing position of the operation of Fig. 6d is reached, and before the position is reached, there is a process in which the cam 15 is idling and the cam 16 is not rotated. At the position where the closing is in place, the 16e tooth and the 16f tooth of the cam 16 are not rotated by the bi-directional limit of the equal radius arc of the cam 15, and the auxiliary switch 17 is accurately positioned. When the brake is opened, the operation of the cam 15, the cam 16 and the auxiliary switch is the same as that at the time of closing, but In contrast to turning and closing, the first switch of the auxiliary switch 17 is to open its normally open contact, and the second switch is to switch its normally closed contact. In the closing and opening, when the auxiliary switch is disconnected from its normally closed and normally open contacts, the full stroke of the contacts is opened for a short time. When the switch is closed, the auxiliary switch normally open contact is turned on after the dynamic contact of the main switch operated by the mechanism is reliably turned on; when the switch is opened, the movable contact of the main switch is very close to the position, and the auxiliary switch is often The closed contact is only turned on.

The action principle and action process of the closing process of the mechanism are the same as the opening process of the mechanism, but the movement direction of each component is opposite and will not be described in detail.

As shown in Fig. 7 and Fig. 8, when the mechanism is manually operated, the operation handle 41 should be inserted into the manual operation interlocking device 3 provided at the lower left portion of the mechanism. When the operating handle 41 is inserted into the inner hole of the interlocking support 37, the tapered surface of the front end of the operating handle first pushes the driving plate 34 of the micro switch 30, and the driving plate 34 pushes the micro switch 30 to switch. When switching, the micro switch 30 The normally closed and normally open contacts respectively cut off the electric operation control loop (it is impossible to perform electric operation at this time), and at the same time, the interlocking electromagnet circuit is turned on, and the interlocking rotary electromagnet 32 is electrically rotated to open the shutter 31 to open the handle. The passage allows the front end of the operating handle to enter beyond the baffle. The handle continues to be inserted, and the front end taper surface pushes the driving plate 36 of the micro switch 28 again, and the driving board 36 pushes the micro switch 28 to switch. When switching, the normally closed and normally open contacts of the micro switch 28 can be cut off only shortly. When the circuit of the interlocking rotary electromagnet 32 is energized and turned on, "the circuit is being manually operated, the signal is turned on; the baffle 31 is rotated by the return spring in the rotary electromagnet, because the operation handle is blocked. The baffle 31 cannot be completely reset, and the operating handle can continue to be inserted until the hexagonal hole at the front end of the handle is placed on the hexagonal end of the manual gear shaft 6, and then the handle is rotated to rotate the manual gear shaft for manual operation.

As shown in FIG. 9, when the power station maintenance needs to lock the mechanism, the lock lever 42 is inserted into the inner hole of the interlocking support 37 and locked (using the padlock 43), similar to the action of inserting the operation handle 41, the insertion lock is inserted. At the time of the lever 42, the lock lever 42 pushes the micro switches 30 and 28 to cut off the electric operation control circuit and the interlocking electromagnet circuit, respectively, to achieve the lock. After the organization is locked, it can prevent others from mishandling the organization without knowing it, causing damage to personnel and equipment.

The control loop of the mechanism and the interlocking solenoid circuit are connected to each other via an "external interlocking circuit". The power supply, the external interlocking circuit is composed of the auxiliary switch contacts of all the switch devices related to the switch operated by the mechanism in the power station. Only the position or state of all the relevant switch devices allows the switch to operate. The external interlock circuit In order to be connected, the control circuit and the electromagnet circuit of the mechanism can be turned on, and the rotating electromagnet 32 can be energized and rotated, and the operating handle 41 can be inserted for manual operation. Through the above manner, the electrical interlock between the manual operation (and the electric operation) of the mechanism and the state of the related switchgear is realized between the manual operation and the electric operation of the mechanism, thereby preventing the misoperation.

Claims

Claim

1. An electric operating mechanism for a switchgear, mainly composed of a movement (1), a mechanism box (2) and a manual operation interlocking device (3), a movement (1), a manual operation interlocking device ( 3) Fixed inside the mechanism box (2), the movement (1) includes a mechanism bracket (24), and the mechanism bracket (24) is provided with a motor (4), a spindle (18), an output shaft (20) and a middle The gear shaft (23), the motor (4) drives the transmission gear (5) fixed on the intermediate gear shaft (23) through its output gear, and drives the output shaft through the gear portion (23a) on the intermediate gear shaft (23) ( 20) on the transmission gear (7), the transmission gear (7) drives the main shaft (18) and the transmission gear (14) on the main shaft (18) and the driving fan gear (11) to rotate; the main shaft (18) in the extension mechanism bracket (24) The end is switched by a micro switch (12) mounted on the mechanism bracket (24) by a cam (13) attached thereto, and the contact in the micro switch is electrically connected to the control loop of the motor, and the output is output. The shaft (20) extends out of the two ends of the mechanism bracket (24) for use with the mechanism The switch connection and the transmission are characterized in that: the other end of the main shaft (18) is fixedly connected with the cam (15), the auxiliary bracket (17) is mounted on the mechanism bracket (24), and the rotating shaft of the auxiliary switch (17) is fixedly connected to the cam (16). ), the cam (15) drives the cam (16) to rotate, and drives the auxiliary switch (17) to switch. The main shaft (18) and the output shaft (20) are connected by the gear/cam combination transmission and the output angle is converted; The gear/cam combination transmission comprises a main shaft (18) coaxially fixedly connected with a driving fan gear (11) and a transmission gear (14), and the transmission fan gear (10) and the driven cam (9) are fixedly connected and empty The main shaft (18) rotates synchronously around the main shaft (18); the output shaft (20) is coaxially fixedly coupled to a driven gear (22), and the driven gear (22) meshes with the transmission fan gear (10), the active cam (8) ) is fixedly connected to the transmission gear (7) and the idle sleeve rotates synchronously around the output shaft (20) on the output shaft (20).

2. The electric operating mechanism for a switchgear according to claim 1, wherein: the gear/cam combination transmission device is provided with a limiting device, and the limiting device is disposed on the active fan gear (11) And inside the transmission fan gear (10), the limiting device comprises a pin (25) disposed on the driving fan gear (11), and an arc groove (10a) on the driving fan gear (10), the groove The two ends are respectively provided with a limiting member (26) and a rubber pad (27), and the pin (25) is in the transmission fan Movement in the arcuate groove (10a) of the gear (10).

3. The electric operating mechanism for a switchgear according to claim 1, wherein: said manual operation interlocking device (3) comprises an interlocking support (37), and an interlocking rotary electromagnet (32) ) Attached to the interlocking bracket (37) by the mounting plate (38), the baffle (31) is fixedly attached to the shaft of the rotating electromagnet (32), and the microswitches (28), (30) are fixed by bolts. On the mounting plate ( 29 ), the mounting plate (29) is fixedly attached to the interlocking bracket (37), the drive plate (36) of the microswitch (28) and the return spring (35) of the drive plate (36) On the pin (40), the pin (40) rotates; the drive plate (34) of the micro switch (30) and the return spring (33) of the drive plate (34) are placed on the pin (39), around The pin (39) turns.

4. The electric operating mechanism for a switchgear according to claim 1, wherein: the transmission fan gear (10) and the driven cam (9) are fixedly connected by a round hole hexagonal sleeve, a spline or a flat key. The active cam (8) and the transmission gear (7) are fixedly connected by a round hole hexagonal sleeve, a spline or a flat key.

5. The electric operating mechanism for a switchgear according to claim 1, wherein: the transmission gear (7) is a drive wheel in a gear/cam combination transmission, and the transmission gear (14) can also be used. As the drive wheel, it is also possible to additionally fix a gear on the main shaft as a drive wheel.

6. The electric operating mechanism for a switchgear according to claim 3, wherein: the action of the microswitch (28), (30) is controlled by the insertion process of the operating handle (41), the microswitch The contacts of (28) and (30) are electrically connected to the control circuit of the mechanism. When the operation handle (41) is inserted and manually operated, the relevant electrical circuit is turned on or off in time to realize interlocking and misoperation prevention.