Transmission device of circuit breaker

Abstract

The utility model belongs to the technical field of medium-voltage switch electrical equipment, and discloses a transmission device of a circuit breaker, a rotatable upper rotating shaft and a rotatable lower rotating shaft are respectively arranged on the upper side and the lower side of a side plate of the circuit breaker, an upper crank arm capable of synchronously rotating is arranged on the upper rotating shaft, and the upper crank arm is rotatably connected with a connecting shaft; the connecting shaft is connected with a rotatable lower crank arm, the lower rotating shaft is rotatably connected with the lower crank arm, a rotating idle stroke is arranged between the lower rotating shaft and the lower crank arm, the lower rotating shaft is connected with a grounding output rotating shaft, and after the lower crank arm rotates through the idle stroke, the lower rotating shaft and the grounding output rotating shaft are sequentially driven to rotate to realize opening or closing of the grounding switch. The device adopts a multi-connecting-rod structure, transmission is simple and reliable, part strength is high, compared with a traditional hinge four-rod mechanism, transmission reliability is higher, the device is simple in overall structure, easy to assemble and easy to operate, manufacturing cost and installation and debugging cost are reduced, and market popularization is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model belongs to electrical equipment - medium voltage switch technology field, and mainly relates to a transmission device of circuit breaker. BACKGROUND

[0002] The grounding switch of the circuit breaker is a mechanical grounding device, which is used to release the static charge of the equipment and circuit under maintenance or repair and to ensure the personal safety of the power-off maintenance personnel. The power-off and power-on operation procedures of the circuit breaker are as follows: first, the circuit breaker is tripped, then the grounding switch is closed, and finally the disconnecting switch is separated; first, the grounding switch is separated, then the disconnecting switch is closed, and finally the circuit breaker is closed. The reliable transmission device of the grounding switch is a reliable guarantee for the safe operation of the circuit breaker.

[0003] The existing double-arc chamber grounding switch has a transmission device of the circuit breaker arranged on a base plate, the transmission device is in transmission connection with a grounding output shaft, and under the action of an energy storage spring, the transmission device drives the grounding output shaft to rotate in the forward and reverse directions to realize the tripping and closing of the grounding switch, and the energy storage spring is driven by the isolation rotation of the shaft in the forward and reverse directions; the locking device realizes the tripping and closing locking of the grounding switch by locking the transmission device when the grounding switch is in the tripped and closed states.

[0004] The existing double-arc chamber grounding switch has a transmission device of the circuit breaker arranged on a base plate, the transmission device is in transmission connection with a grounding output shaft, and under the action of an energy storage spring, the transmission device drives the grounding output shaft to rotate in the forward and reverse directions to realize the tripping and closing of the grounding switch, and the energy storage spring is driven by the isolation rotation of the shaft in the forward and reverse directions; the locking device realizes the tripping and closing locking of the grounding switch by locking the transmission device when the grounding switch is in the tripped and closed states.

[0005] However, the above-mentioned transmission device has many parts and a complex structure, and when the assembly precision is not high, it may cause unreliable transmission, and if a double-arc chamber grounding switch is used, the cost is high compared with the present application. SUMMARY

[0006] To solve the above problems, the utility model provides a transmission device of circuit breaker, this transmission device simple structure, safe and reliable.

[0007] To achieve the above purpose, the utility model is through following technical scheme:

[0008] The transmission device of a circuit breaker, rotatable upper and lower rotating shafts are arranged at the upper and lower sides of the side plate of the circuit breaker, the upper rotating shaft is provided with a synchronously rotatable upper crank arm, the upper crank arm is rotatably connected with a connecting shaft, the connecting shaft is connected with a rotatable lower crank arm, the lower rotating shaft is rotatably connected with the lower crank arm, a rotating idle stroke is arranged between the two, the lower rotating shaft is connected with a grounding output rotating shaft, after the lower crank arm rotates through the idle stroke, the lower rotating shaft and the grounding output rotating shaft are sequentially driven to rotate, thereby realizing the opening or closing of the grounding switch.

[0009] Further, the lower crank arm comprises a crank arm sleeve, the crank arm sleeve is provided with a crank arm sleeve long waist hole, the lower rotating shaft is provided with a lower rotating shaft through hole at the position corresponding to the crank arm sleeve long waist hole, one end of the cylindrical pin is completely inserted into the lower rotating shaft through hole, and the other end protrudes into the crank arm sleeve long waist hole, the size of the crank arm sleeve long waist hole is matched with the idle angle of the lower crank arm.

[0010] Further, the connecting shaft comprises a Y-shaped connecting shaft and an adjusting shaft, the two are threadedly connected, the lower crank arm further comprises a crank arm, the Y-shaped connecting shaft is rotatably connected with the upper crank arm, and the adjusting shaft is rotatably connected with the crank arm.

[0011] Further, the lower rotating shaft is sleeved with an ear shaft sleeve at one end close to the side plate, the ear shaft sleeve is provided with a protruding ear, one end of a spring mounting rod is rotatably connected with the ear, the other end of the spring mounting rod is provided with a mounting rod long waist hole, the spring mounting rod is movably connected with the side plate through a plug-in pin shaft, a spring sleeve is arranged on the spring mounting rod, and the fixed position of the pin shaft is on the same vertical line with the position where the lower rotating shaft passes through the side plate.

[0012] Further, the circuit breaker is provided with a closing limiting bolt and an opening limiting bolt, the grounding output rotating shaft is respectively provided with a closing limiting crank arm and an opening limiting crank arm, when the grounding switch is closed, the closing limiting bolt abuts against the closing limiting crank arm to realize limiting, and when the grounding switch is opened, the opening limiting bolt abuts against the opening limiting crank arm to realize limiting.

[0013] Further, the upper rotating shaft and the upper crank arm are limited and fixed through a bearing seat, and the top end of the upper rotating shaft is provided with a tool groove.

[0014] Further, the upper crank arm, the connecting shaft and the lower crank arm are arranged at the end of the upper rotating shaft and the lower rotating shaft away from the side plate.

[0015] Further, the idle angle is 20°-30°.

[0016] Further, when the grounding switch is closed, a tool is inserted into the tool groove, the upper rotating shaft is rotated clockwise, the upper crank arm is synchronously rotated clockwise, the connecting shaft is driven to move downward by the upper crank arm, the lower crank arm is further pushed (counterclockwise rotation), the lower rotating shaft is counterclockwise rotated after the lower crank arm rotates through the idle stroke, the grounding output rotating shaft is counterclockwise rotated by the lower rotating shaft, and the grounding switch is closed with the grounding row.

[0017] Further, when the ground switch is opened, the tool is inserted into the tool slot, the upper rotating shaft is rotated counterclockwise, the upper crank arm is synchronously rotated counterclockwise, the connecting shaft is driven to move upward by the upper crank arm, the lower crank arm is rotated clockwise, and the lower rotating shaft is rotated clockwise after the lower crank arm rotates through the idle stroke, so that the ground output rotating shaft is rotated clockwise, and the ground switch is separated from the ground row.

[0018] Compared with the prior art, the utility model has the beneficial effects that:

[0019] The transmission device of the circuit breaker has the advantages that: the transmission of the crank arm, connecting rod and the like of the multi-connecting rod mechanism is simple and reliable, the part strength is high, and the transmission reliability is higher than that of the traditional hinge four-bar mechanism; the rebound impact when the ground switch is opened and closed is limited by the added spring, so that the reliability and safety of the opening and closing of the ground switch are improved, and the structure is simpler and more reliable; the ground switch is limited by the fixed limiting bolt on the cabinet of the circuit breaker, and the method is simple, reliable and low in cost; the overall structure of the device is simple, the assembly and operation are simple, the manufacturing cost and installation and debugging cost are reduced, and the device is convenient for market promotion. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a three-dimensional structure schematic view of the utility model.

[0021] Figure 2 It is an installation schematic view of the lower crank arm and the lower rotating shaft of the utility model.

[0022] Figure 3 It is a schematic view of the closed state of the ground switch of the utility model.

[0023] Figure 4 It is a front view. Figure 3

[0024] Figure 5 It is an A-A sectional view.

[0025] Figure 6 It is a schematic view of the movement direction of the transmission device when the ground switch is closed.

[0026] Figure 7 It is a schematic view of the state of the ground switch after being opened.

[0027] Figure 8 It is a front view. Figure 7

[0028] Figure 9 It is a B-B sectional view.

[0029] Figure 10 It is a schematic view of the movement direction of the transmission device when the ground switch is opened.

[0030] Wherein:​​

[0031] 1. side plate;

[0032] 2. upper rotating shaft;

[0033] 3. upper crank;

[0034] 4. bearing seat;

[0035] 5. connecting shaft; 5-1, Y-shaped connecting shaft; 5-2, adjusting shaft;

[0036] 6. lower crank; 6-1, crank sleeve; 6-1-1, crank sleeve long waist hole; 6-2, crank;

[0037] 7. lower rotating shaft;

[0038] 8. cylindrical pin;

[0039] 9. lug sleeve; 9-1, lug;

[0040] 10. spring mounting rod; 10-1, mounting rod long waist hole;

[0041] 11. spring;

[0042] 12. grounding output rotating shaft; 12-1, closing limit crank; 12-2, opening limit crank;

[0043] 13. grounding switch;

[0044] 14. sensor;

[0045] 15. grounding row;

[0046] 16. closing limit bolt;

[0047] 17. opening limit bolt. DETAILED DESCRIPTION

[0048] The specific embodiments of the utility model will be further clarified in combination with the drawings.

[0049] As Figure 1 shown, it is a kind of drive device of circuit breaker, is installed on the side plate 1 of circuit breaker, is used to open or close the grounding switch 13 of circuit breaker.

[0050] The grounding switch 13 is connected to the grounding output rotating shaft 12 arranged on the circuit breaker, a sensor 14 is arranged on the circuit breaker, the end of the sensor 14 is provided with a grounding rod 15 for contacting or separating with the grounding switch 13, meanwhile, the grounding output rotating shaft 12 is respectively provided with a closing limiting crank arm 12-1 and an opening limiting crank arm 12-2, correspondingly, the circuit breaker is provided with a closing limiting bolt 16 and an opening limiting bolt 17, when the grounding output rotating shaft 12 rotates to drive the grounding switch 13 to close, the closing limiting bolt 16 abuts against the closing limiting crank arm 12-1 to limit it, and when the grounding output rotating shaft 12 rotates to drive the grounding switch 13 to open, the opening limiting bolt 17 abuts against the opening limiting crank arm 12-2 to limit it.

[0051] The transmission device of the circuit breaker is a multi-link mechanism, mainly including an upper rotating shaft 2, an upper crank arm 3, a connecting shaft 5, a lower crank arm 6 and a lower rotating shaft 7.

[0052] One end of the upper rotating shaft 2 is rotatably arranged on the side plate 1, and the other end away from the side plate 1 is provided with the upper crank arm 3, the upper rotating shaft 2 and the upper crank arm 3 are limited and fixed by the bearing seat 4 to realize synchronous rotation, specifically, the bearing seat 4 and the upper rotating shaft 2 are circumferentially fixed by the elastic cylindrical pin 13, the bearing seat 4 and the upper crank arm 3 are matched by the square rod and the square groove to realize circumferential fixing, meanwhile, the top end of the upper rotating shaft 2 on the same side is provided with a tool slot for facilitating insertion of a tool to rotate the upper rotating shaft 2, and rotating the upper rotating shaft 2 can drive the bearing seat 4 and the upper crank arm 3 to link simultaneously.

[0053] The upper crank arm 3 is rotatably connected with the connecting shaft 5, the connecting shaft 5 is rotatably connected with the lower crank arm 6, and the lower crank arm 6 is movably connected with the lower rotating shaft 7. Specifically, the connecting shaft 5 includes a Y-shaped connecting shaft 5-1 and an adjusting shaft 5-2, the Y-shaped connecting shaft 5-1 is connected with the upper crank arm 3 through a pin shaft at the Y end, the other side opposite to the Y end is provided with a thread, the adjusting shaft 5-2 is provided with a threaded hole at one end corresponding to the Y-shaped connecting shaft 5-1, and the two are connected through threads, and the outside is fixed through a nut to achieve fastening effect. The advantage of such arrangement is that when the circuit breaker is installed and debugged on site, the length of the connecting shaft 5 can be adjusted by adjusting the thread, the assembly error between parts is reduced, and the assembly requirements of the circuit breaker are met.

[0054] As shown in Figure 2 The lower crank arm 6 includes a crank arm sleeve 6-1 and a crank arm 6-2, one end of the lower rotating shaft 7 is sleeved in the crank arm sleeve 6-1 and rotatably connected with the lower crank arm, and the other end rotatably penetrates through the side plate 1 and is connected with the grounding output rotating shaft 12.

[0055] Specifically, the adjusting shaft 5-2 is rotatably connected with the toggle arm 6-2 through a pin shaft, the side wall of the toggle arm sleeve 6-1 is provided with a toggle arm sleeve long waist hole 6-1-1, the end of the lower rotating shaft 7 is provided with a lower rotating shaft through hole, the end of the lower rotating shaft 7 is inserted into the toggle arm sleeve 6-1, the lower rotating shaft through hole corresponds to the toggle arm sleeve long waist hole 6-1-1, a cylindrical pin 8 is inserted from the toggle arm sleeve long waist hole 6-1-1, one end of the cylindrical pin 8 is fully inserted into the lower rotating shaft through hole, and the other end protrudes in the toggle arm sleeve long waist hole 6-1-1, as shown in Figure 2 Therefore, the relative movement between the lower rotating shaft 7 and the lower toggle arm 6 can form a certain angle of rotation idle stroke, the idle angle is 2 times the rotation idle stroke, the larger the toggle arm sleeve long waist hole 6-1-1, the larger the rotation idle stroke. According to the design requirement, the embodiment sets the idle stroke of 20°-30° rotation of the lower toggle arm, and 25° is the best. For example, the idle angle is 50°, the rotation idle stroke is 25°, and the rotation idle stroke is set for clockwise rotation and counterclockwise rotation.

[0056] Here, the cylindrical pin 8 can be in interference fit or other fixed manner, and is stably connected with the lower rotating shaft through hole of the lower rotating shaft 7.

[0057] The advantages of such setting are that: due to the effect of the cylindrical pin 8, the lower toggle arm 6 can rotate relative to the lower rotating shaft 7, and at the same time, due to the fact that the cylindrical pin 8 is also limited in the toggle arm sleeve long waist hole 6-1-1, the rotation angle of the lower toggle arm 6 relative to the lower rotating shaft 7 can also be limited. When the Y-shaped connecting shaft 5-1, the adjusting shaft 5-2 and the toggle arm 6-2 are in a straight line during the opening process of the grounding switch, it is easy to form a mechanical dead point. The design of the rotation idle stroke is to facilitate the passing of the mechanical dead point and prevent the problem of mechanism jam caused by machining error of parts.

[0058] During the closing process of the grounding switch, the lower toggle arm 6 rotates counterclockwise, first counterclockwise idle stroke 25°, and then drives the lower rotating shaft 7 to rotate counterclockwise. During the opening process of the grounding switch, the lower toggle arm 6 rotates clockwise, first clockwise idle stroke 25°, and then drives the lower rotating shaft 7 to rotate clockwise.

[0059] The lower rotating shaft 7 is installed on the side plate 1 side with a lug shaft sleeve 9, the lug shaft sleeve 9 is provided with a protruding lug 9-1, one end of the spring mounting rod 10 is rotatably connected with the lug 9-1, the other end is provided with a mounting rod long waist hole 10-1, and the other end is rotatably connected with the side plate 1 through a pin shaft. The fixed position of the pin shaft and the position of the lower rotating shaft 7 passing through the side plate 1 are in vertical state, and the spring 11 is sleeved on the spring mounting rod 10 and is provided with a pre-tightening pressure.

[0060] When the lower rotating shaft 7 rotates clockwise or counterclockwise, the lug sleeve 9 rotates synchronously, and the lug 9-1 pushes the spring mounting rod 10 to move up and down. When the lug 9-1 and the spring mounting rod 10 rotate to the vertical position, the spring 11 is subjected to the maximum pressure. Once the lug 9-1 drives the spring mounting rod 10 to pass the vertical position, the pressure of the spring 11 is released, and the lug sleeve 9 is prevented from rotating back, so that the lower rotating shaft 7 drives the grounding output rotating shaft 12 to no longer rotate back, thereby ensuring that the grounding switch does not bounce and shake during the closing or opening process, preventing the phenomenon of air insulation breakdown caused by excessive bounce and insufficient insulation distance, and improving the reliability of the grounding switch.

[0061] As shown in Figures 3-6 , the process of closing the grounding switch by the circuit breaker is as follows:

[0062] Insert a tool into the tool slot at the end of the upper rotating shaft 2, and rotate the upper rotating shaft 2 clockwise to drive the bearing seat 4 and the upper crank arm 3 to rotate synchronously clockwise, as shown in Figure 6 , the upper crank arm 3 drives the adjusting shaft 5-2 and the Y-shaped connecting shaft 5-1 to move downward, as shown in Figure 6 , the adjusting shaft 5-2 and the Y-shaped connecting shaft 5-1 push the lower crank arm 6 to rotate counterclockwise. After the lower crank arm 6 rotates through the idle stroke, it drives the lower rotating shaft 7 to rotate counterclockwise, and the lower rotating shaft 7 drives the grounding output rotating shaft 12 to rotate counterclockwise, thereby driving the grounding switch 13 to close with the grounding row 15, and the sensor 14 displays no electrification on the electrification display.

[0063] At the same time, the lower rotating shaft 7 rotates counterclockwise, and the lug 9-1 drives the spring mounting rod 10 to rotate counterclockwise from the right side of the vertical position to the left side. When the vertical position, the spring 11 is subjected to the maximum pressure. Once the vertical position is passed, the pressure of the spring 11 is released, and the lug sleeve 9 is always positioned on the left side and no longer rotates back, thereby ensuring the reliability of the grounding switch closing.

[0064] At this time, the closing limit bolt 16 abuts against the closing limit crank arm 12-1, as shown in Figure 5 .

[0065] As shown in Figures 7-10 , the process of opening the grounding switch by the circuit breaker is as follows:

[0066] Insert a tool into the tool slot at the end of the upper rotating shaft 2, and rotate the upper rotating shaft 2 counterclockwise to drive the bearing seat 4 and the upper crank arm 3 to rotate synchronously counterclockwise, as shown in Figure 10 , the upper crank arm 3 drives the adjusting shaft 5-2 and the Y-shaped connecting shaft 5-1 to move upward, as shown in Figure 10As shown, the adjusting shaft 5-2 and the Y-shaped connecting shaft 5-1 push the lower crank 6 to rotate clockwise, and after the lower crank 6 rotates through the idle stroke, the lower rotating shaft 7 is driven to rotate clockwise, the lower rotating shaft 7 drives the grounding output rotating shaft 12 to rotate clockwise, thereby driving the grounding switch 13 to separate from the grounding row 15, and the sensor 14 displays the electrification on the electrification display.

[0067] At the same time, the lower rotating shaft 7 rotates clockwise, the lug 9-1 drives the spring mounting rod 10 to rotate clockwise from the left side of the vertical position to the right side, when the spring 11 is in the vertical position, the spring 11 is subjected to the maximum pressure, and when the spring 11 is over the vertical position, the pressure of the spring 11 is released, and the lug shaft sleeve 9 can be always positioned on the right side, and no longer rotates, thereby ensuring the reliability of the opening of the grounding switch.

[0068] At this time, the opening limiting bolt 17 abuts against the opening limiting crank 12-2, and the opening limiting is achieved, as shown. Figure 10

[0069] In the embodiment, due to the effects of the upper rotating shaft 2 and the lower rotating shaft 7, the upper crank 3, the connecting shaft 5 and the lower crank 6 are away from the circuit breaker, thereby meeting the air insulation requirement of the medium voltage switch, and avoiding the discharge of the multi-link mechanism when the grounding switch is separated.

[0070] Finally, it should be noted that: the above is only the preferred embodiment of the present application, and is not used to limit the present application, although the present application is described in detail with reference to the embodiments, for those skilled in the art, the technical solutions recorded in the above embodiments can be modified, or some technical features can be replaced, but any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application should be included in the protection scope of the present application.​

Claims

1. A drive for a circuit breaker, characterized in that The upper rotating shaft (2) and the lower rotating shaft (7) are arranged at the upper and lower sides of the side plate (1) of the circuit breaker respectively, the upper rotating shaft (2) is provided with the upper crank arm (3) capable of synchronous rotation, the upper crank arm (3) is rotatably connected with the connecting shaft (5), the connecting shaft (5) is connected with the lower crank arm (6) capable of rotation, the lower rotating shaft (7) is rotatably connected with the lower crank arm (6), and the rotating idle stroke is arranged between the two. The lower rotating shaft (7) is connected with the grounding output rotating shaft (12), the lower crank arm (6) drives the lower rotating shaft (7) and the grounding output rotating shaft (12) to rotate in turn after rotating through the idle stroke, and the opening or closing of the grounding switch (13) is realized.

2. A drive for a circuit breaker according to claim 1, wherein The lower crank arm (6) comprises a crank arm sleeve (6-1), the crank arm sleeve (6-1) is provided with a crank arm sleeve long waist hole (6-1-1), the lower rotating shaft (7) is provided with a lower rotating shaft through hole corresponding to the position of the crank arm sleeve long waist hole (6-1-1), a cylindrical pin (8) is fully inserted into the lower rotating shaft through hole at one end and protrudes into the crank arm sleeve long waist hole (6-1-1) at the other end, and the size of the crank arm sleeve long waist hole (6-1-1) is matched with the idle angle of the lower crank arm (6).

3. A drive for a circuit breaker according to claim 1, wherein The connecting shaft (5) comprises a Y-shaped connecting shaft (5-1) and an adjusting shaft (5-2), the two are threadedly connected, the lower crank arm (6) further comprises a crank arm (6-2), the Y-shaped connecting shaft (5-1) is rotatably connected with the upper crank arm (3), and the adjusting shaft (5-2) is rotatably connected with the crank arm (6-2).

4. A drive for a circuit breaker according to claim 1, wherein The lower rotating shaft (7) is provided with an ear shaft sleeve (9) close to one end of the side plate (1), the ear shaft sleeve (9) is provided with a protruding ear (9-1), one end of a spring mounting rod (10) is rotatably connected with the ear (9-1), the other end is provided with a mounting rod long waist hole (10-1), and the spring mounting rod (10) is movably connected with the side plate (1) by inserting a pin shaft, a spring (11) is sleeved on the spring mounting rod (10), and the position of the pin shaft is fixed on the same vertical line as the position of the lower rotating shaft (7) penetrating through the side plate (1).

5. A drive for a circuit breaker according to claim 1, wherein, The circuit breaker is provided with a closing limiting bolt (16) and an opening limiting bolt (17), the grounding output rotating shaft (12) is respectively provided with a closing limiting crank arm (12-1) and an opening limiting crank arm (12-2), when the grounding switch (13) is closed, the closing limiting bolt (16) abuts against the closing limiting crank arm (12-1) to realize limiting, and when the grounding switch (13) is opened, the opening limiting bolt (17) abuts against the opening limiting crank arm (12-2) to realize limiting.

6. A drive for a circuit breaker according to claim 1, wherein, The upper rotating shaft (2) and the upper crank arm (3) are limited and fixed through the bearing seat (4), and the top end of the upper rotating shaft (2) is provided with a tool groove.

7. A drive for a circuit breaker according to claim 1, wherein The upper crank arm (3), the connecting shaft (5) and the lower crank arm (6) are arranged at the end of the upper rotating shaft (2) and the lower rotating shaft (7) away from the side plate (1).

8. A drive for a circuit breaker according to claim 2, wherein, The idle angle is 20°-30°.

9. A drive for a circuit breaker according to claim 1 wherein, When closing the grounding switch, the tool is inserted into the tool slot, the upper rotating shaft (2) is rotated clockwise, the upper crank arm (3) is rotated clockwise synchronously, the connecting shaft (5) is moved downward, the lower crank arm (6) is rotated counterclockwise, the lower crank arm (6) is rotated through the idle stroke, the lower rotating shaft (7) is rotated counterclockwise, the grounding output rotating shaft (12) is rotated counterclockwise, and the grounding switch (13) is closed with the grounding row (15).

10. A drive for a circuit breaker according to claim 1, wherein, When opening the grounding switch, the tool is inserted into the tool slot, the upper rotating shaft (2) is rotated counterclockwise, the upper crank arm (3) is rotated counterclockwise synchronously, the connecting shaft (5) is moved upward, the lower crank arm (6) is rotated clockwise, the lower crank arm (6) is rotated through the idle stroke, the lower rotating shaft (7) is rotated clockwise, the grounding output rotating shaft (12) is rotated clockwise, and the grounding switch (13) is separated from the grounding row (15).

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