Low voltage switch closing method

Abstract

The application provides a low-voltage switch closing method, and relates to the technical field of circuit breaker reclosing, which comprises the following steps: a, preparation; b, judging tripping; c, judging tripping type; d, judging whether the voltage fault is recovered; e, automatic closing operation; and f, judging closing result. The closing method can automatically distinguish the voltage loss tripping from other tripping, and can automatically close the low-voltage switch when the voltage is recovered to normal after the voltage loss tripping. The application provides a low-voltage switch closing method, and the closing device of the application adopts a ratchet structure. The application does not affect the original performance of the low-voltage switch, and the automatic closing device only acts on the reclosing operation after the voltage loss tripping of the low-voltage switch.

Description

Technical Field

[0001] This invention relates to the field of circuit breaker reclosing technology, specifically to a method for closing a low-voltage switch. Background Technology

[0002] Short circuits and grounding faults frequently occur in power transmission lines, causing temporary voltage fluctuations in the low-voltage distribution network. This leads to numerous low-voltage distribution network switches tripping due to voltage loss, resulting in widespread power outages for residents. Once the power transmission lines are repaired and the grid voltage returns to normal, the low-voltage distribution network switches lack the function of reclosing after voltage loss. Currently, power is restored manually on-site, which is time-consuming, labor-intensive, inefficient, and lacks reliable power supply. The long restoration time also leads to numerous complaints and power outages. To quickly restore power to residents, improve power supply efficiency, reduce work orders and complaints, and save time and effort, there is an urgent need to develop an automatic reclosing device for low-voltage distribution network switches that trips due to voltage loss. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide an automatic closing device for low-voltage switch undervoltage tripping, so as to solve the drawback of the prior art that it is impossible to reclose the low-voltage switch undervoltage tripping in the pipeline.

[0004] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0005] An automatic closing device for a low-voltage switch undervoltage trip includes a body, a rotating shaft, a transmission mechanism, power supply devices, and a control board. The body is provided with several hook mechanisms for fixing the body and the low-voltage switch. The rotating shaft passes through the body, and the transmission mechanism passes through the rotating shaft. A drive device is provided on one side of the transmission mechanism, and the drive device is connected to the transmission mechanism. There are four power supply devices, each connected to the body by a flexible wire. Three power supply devices are located at the upper end of the body, and one power supply device is located at the lower end of the body. The control board is electrically connected to the drive device and the power supply devices respectively.

[0006] According to a further preferred embodiment of the above technical solution, the transmission mechanism includes a first gear, a second gear, and a ratchet. The first gear and the second gear are meshed together. The ratchet is sleeved inside the first gear and rotates coaxially with the first gear. The first gear is provided with a fixing pin, and a pawl is sleeved on the fixing pin. The pawl abuts against the ratchet. The second gear is fixedly connected to the output shaft of the drive device.

[0007] Preferably, there is one, two, three, or four fixing pins, and a torsion spring is fitted on the fixing pin. One end of the torsion spring is fixedly connected to the first gear, and the other end of the torsion spring is fixedly connected to the pawl.

[0008] Preferably, the ratchet is welded to the shaft, or keyed, or pinned, and the first gear is connected to the shaft bearing.

[0009] Preferably, the outer end of the rotating shaft is provided with an internal hexagonal cylindrical head, and the inner end of the rotating shaft is provided with a hexagonal square head. The internal hexagonal cylindrical head is used to abut against an internal hexagonal wrench, and the hexagonal square head is used to abut against a low-voltage switch.

[0010] Preferably, the power-collecting device includes a housing, a magnet, a power-collecting needle, and a handle. The handle is disposed on the housing, the magnet is embedded in the housing, and the power-collecting needle is connected to a control board wire. The housing has a probe groove, the power-collecting needle is disposed in the probe groove and slides freely along the probe groove, the end of the power-collecting needle extends out of the housing, and a spring is passed through the power-collecting needle. The spring causes the power-collecting needle to move away from the probe groove. The housing and the handle are both made of insulating material.

[0011] Preferably, the hook mechanism includes a hook plate, a support plate, and a pressure plate. The end of the hook plate is provided with hook teeth. One end of the support plate is fixedly connected to the main body, and the other end of the support plate is connected to the rotating shaft of the pressure plate. One end of the hook plate is connected to the rotating shaft of the middle section of the pressure plate. There are eight hook mechanisms, which are distributed at the upper and lower ends of the main body respectively.

[0012] Preferably, the drive mechanism includes a motor and a reduction mechanism.

[0013] Preferably, the control board includes a microcontroller module, a memory module, a voltage transformer module, a comparator module, and a rectifier module. The microcontroller module is the control center of the control board. The voltage transformer module is used to detect the voltage at the front and rear ends of the switch. The comparator module is used to determine whether the drive mechanism has started. The rectifier module is used to provide power to the drive mechanism.

[0014] An automatic closing method for a low-voltage switch that has tripped due to undervoltage, the automatic closing method comprising the following steps:

[0015] Step a, preparation work: install the low-voltage switch undervoltage trip automatic closing device on the low-voltage switch, and magnetically attach each power supply device to the bolts of each terminal of the low-voltage switch.

[0016] Step b, determine the tripping status. The control board determines whether the low-voltage switch has tripped and opened based on the voltage detection of the power supply devices at the front and rear ends of the switch. If there is voltage at the front end of the low-voltage switch but no voltage at the rear end, the switch is in the tripped and opened state.

[0017] Step c: Determine the tripping type. The control board determines whether it is a voltage undervoltage trip based on the voltage detection of the four power supply devices at the front end of the low-voltage switch. If an abnormal voltage is detected at the front end of the low-voltage switch, it is a voltage undervoltage trip. If no abnormal voltage is detected at the front end of the low-voltage switch, it is a tripping trip due to other faults.

[0018] Step d: Determine whether the undervoltage fault has been recovered. If the tripping type in step b above is undervoltage tripping, then determine whether the undervoltage fault has been recovered by checking the voltage of the four power supply devices at the front end of the low-voltage switch. After the undervoltage fault is eliminated, perform a delay for a period of time to check if the voltage is qualified, and then start the undervoltage tripping automatic closing procedure.

[0019] Step e, automatic closing operation, the control board outputs the drive mechanism to act, under the action of the drive mechanism, the second gear and the first gear are driven to rotate in sequence, thereby driving the ratchet to rotate, and then the rotating shaft drives the closing mechanism of the low voltage switch to close the circuit breaker;

[0020] Step f: Determine the closing result. According to step d, the low-voltage switch starts the closing action under the drive of the rotating shaft. When the low-voltage switch is successfully closed, the power supply device at the back end of the low-voltage switch detects the voltage, which means that the low-voltage switch is successfully closed. At this time, the control board controls the drive mechanism to stop rotating, completing the automatic closing operation.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1. This invention provides an automatic closing device and method for low-voltage switch undervoltage trip. This invention can automatically distinguish between undervoltage trip and other fault trips. After the voltage returns to normal when the undervoltage trip occurs, the low-voltage switch can be automatically closed.

[0023] 2. This invention provides an automatic closing device and method for low-voltage switch undervoltage tripping. The invention is designed with a detachable structure, which facilitates the installation and fixing or removal of the device from the low-voltage switch. The installation and disassembly process is simple, convenient, safe and reliable.

[0024] 3. This invention provides an automatic closing device and method for low-voltage switch undervoltage trip. The closing device of this invention adopts a ratchet structure. The application of this device does not affect the original performance of the low-voltage switch. The automatic closing device of this invention only performs the reclosing operation after the low-voltage switch undervoltage trip. Attached Figure Description

[0025] Figure 1 This is a side view of the actual device of the present invention;

[0026] Figure 2 This is a schematic diagram of the internal structure of the device of the present invention;

[0027] Figure 3 This is a front view schematic diagram of the device of the present invention;

[0028] Figure 4 This is a schematic diagram of the transmission mechanism of the device of the present invention;

[0029] Figure 5 This is an enlarged schematic diagram of the hook mechanism of the device of the present invention;

[0030] Figure 6 This is a schematic diagram of the power supply device structure of the present invention;

[0031] Figure 7 This is a bottom view of the power supply device of the present invention.

[0032] Figure 8 This is an enlarged schematic diagram of the electro-acquisition needle structure of the device of the present invention;

[0033] Figure 9 This is a schematic diagram of the control flow structure of the device of the present invention.

[0034] In the diagram: 1. Body, 2. Shaft, 21. Socket hexagonal head, 22. Hexagonal square head, 3. Transmission mechanism, 31. First gear, 32. Second gear, 33. Ratchet, 34. Fixing pin, 35. Pawl, 36. Torsion spring, 37. 4. Power supply device, 41. Housing, 42. Magnet, 43. Power supply needle, 44. Handle, 45. Spring, 46. Probe groove, 5. Control board, 6. Hook mechanism, 61. Hook plate, 62. Support plate, 63. Pressure plate, 7. Drive device, 8. Wiring lug, 9. Fixing bolt, 10. Low-voltage switch. Detailed Implementation

[0035] In this disclosure, terms such as "upper," "lower," "left," "right," "front," "back," "vertical," "horizontal," "first," "second," and "middle end" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are merely relational terms determined for the convenience of describing the structural relationship of the various components or elements in this disclosure and do not specifically refer to any component or element in this disclosure, nor should they be construed as limiting this disclosure.

[0036] The present invention will be further described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0037] like Figures 1-9As shown, the present invention provides an automatic closing device for a low-voltage switch undervoltage trip, comprising a body 1, a rotating shaft 2, a transmission mechanism 3, a power supply device 4, and a control board 5; the body 1 is provided with a plurality of hook mechanisms 6, which are used to fix the body 1 and the low-voltage switch; the rotating shaft 2 passes through the body 1, and the transmission mechanism 3 passes through the rotating shaft 2; a drive device 7 is provided on one side of the transmission mechanism 3, and the drive device 7 is connected to the transmission mechanism 3 in a driving connection; there are four power supply devices 4, which are connected to the body 1 by flexible wires, with three power supply devices 4 located at the upper end of the body 1 and one power supply device 4 located at the lower end of the body 1; the control board 5 is electrically connected to the drive device 7 and the power supply devices 4 respectively. In this embodiment of the invention, the main body 1 of the device is fixedly connected to the low-voltage switch 10 by the hook mechanism 6. The power taking device 4 is magnetically attracted to the fixing bolt 9 of the wiring lug 8. In this embodiment of the invention, the power taking device 4 is provided with a groove structure, which can be set according to the size of the fixing bolt 9 so that the power taking device 4 is just stuck on the fixing bolt 9. At the same time, the power taking pin on the power taking device 4 abuts against the wiring lug 8, and obtains the power from the front end of the low-voltage switch through the power taking pin to supply the control board 5 of the device to work. The device of this invention is applicable to low-voltage switches 10 from different manufacturers and models. Generally, the low-voltage switch 10 is an intelligent reclosing circuit breaker, equipped with a manual closing knob. A commonly used Allen wrench is used as the manual closing wrench to prevent the low-voltage switch from failing to close automatically when damaged. The device of this invention can be designed with a suitable position of the rotating shaft 2 according to the different manual closing positions of different manufacturers and models. When the device of this invention controls the closing of the low-voltage switch 10, the rotating shaft 2 of this invention is inserted into the manual closing position of the low-voltage switch 10 through the hexagonal square head 22. The drive device 7 is controlled by the control board 5 to realize the rotation of the rotating shaft 2 to achieve the purpose of closing.

[0038] The transmission mechanism 3 includes a first gear 31, a second gear 32, and a ratchet 33. The first gear 31 and the second gear 32 are meshed together. The ratchet 33 is sleeved inside the first gear 31 and rotates coaxially with the first gear 31. The first gear 31 is provided with a fixing pin 34, and a pawl 35 is sleeved on the fixing pin 34. The pawl 35 abuts against the ratchet 33. The second gear 32 is fixedly connected to the output shaft of the drive device 7. The transmission mechanism 3 in this embodiment of the invention includes a first gear 31, a second gear 32, and a ratchet 33. The first gear 31 has an inner groove, and the ratchet 33 is disposed in the inner groove of the first gear 31 and rotates coaxially. The ratchet 33 is fixedly connected to the rotating shaft 2 and is used to drive the rotating shaft 2 to rotate. The ratchet 33 has helical teeth to control the unidirectional rotation of the ratchet 33. The inner groove of the first gear 31 also has a pawl 35, which abuts against the helical teeth of the ratchet 33. When the first gear 31 rotates clockwise, it can drive the ratchet 33 to rotate. When the ratchet 33 rotates clockwise, the ratchet cannot drive the first gear 31 to rotate. A torsion spring 36 is provided on the fixing pin 34 to control the pawl 35 to cooperate tightly with the ratchet 33 and prevent the ratchet 33 from slipping. The design of the transmission mechanism 3 of the present invention does not affect the original performance of the low-voltage switch 10. The automatic closing device of the present invention only acts on the reclosing operation after the low-voltage switch loses pressure and trips.

[0039] The fixing pin 34 can be one, two, three, or four. A torsion spring 36 is fitted onto each fixing pin 34. One end of the torsion spring 36 is fixedly connected to the first gear 31, and the other end of the torsion spring 36 is fixedly connected to the pawl 35. The number of fixing pins 34 in the device of this invention can be one, two, three, or four. In this embodiment, two fixing pins are used, respectively positioned at opposite ends of the ratchet 33. This configuration achieves unidirectional transmission while reducing the design complexity of the transmission structure, exhibiting strong practicality and simplicity.

[0040] The ratchet 33 is fixedly connected to the rotating shaft 2 by welding, keying, or pin, and the first gear 31 is connected to the rotating shaft 2 by bearing.

[0041] The outer end of the rotating shaft 2 is provided with an internal hexagonal cylindrical head 21, and the inner end of the rotating shaft 2 is provided with a hexagonal square head 22. The internal hexagonal cylindrical head 21 is used to abut against an internal hexagonal wrench, and the hexagonal square head 22 is used to abut against a low-voltage switch. In this embodiment of the invention, the rotating shaft 2 can be cylindrical, square, or hexagonal. In this embodiment of the invention, a hexagonal shape is used, integrally formed with the hexagonal square head 22.

[0042] The power-collecting device 4 includes a housing 41, a magnet 42, a power-collecting needle 43, and a handle 44. The handle 44 is disposed on the housing 41, the magnet 42 is embedded inside the housing 41, and the power-collecting needle 43 is connected to the control board 5 by wires. The housing 41 is provided with a probe groove 46, and the power-collecting needle 43 is disposed in the probe groove 46 and slides freely along the probe groove 46. The end of the power-collecting needle 43 extends out of the housing 41, and a spring 45 passes through the power-collecting needle 43. The spring 45 causes the power-collecting needle 43 to move away from the probe groove 46. The housing 41 and the handle 44 are both made of insulating material. In this embodiment of the invention, the power-collecting needle 43 and the housing 41 of the power-collecting device can move relative to each other, and the end of the power-collecting needle 43 protrudes from the housing 41 of the power-collecting device for contacting the live power source with the connector lug. The power-collecting needle 43 is equipped with a spring 45, which causes the power-collecting needle 43 to tend to pop out of the probe groove 46. When the power-collecting device 4 is attracted to the fixing bolt, the magnetic force generates a squeezing force on the power-collecting needle 43. Under the combined action of the spring force and the magnetic force, the power-collecting needle 43 makes better contact with the connector lug. In this embodiment of the invention, the design can also avoid the drawbacks such as poor power collection caused by the uncertain contact position between the power-collecting device 4 and the connector lug.

[0043] The outer casing 41 is embedded with a magnet 42 and a power-taking needle 43, which is connected to the control board 5 via wires. Both the outer casing 41 and the handle 44 are made of insulating material. The power-taking device 4 in this invention is used to obtain power from the power grid and also to detect whether the low-voltage switch 10 has tripped, and to determine the type of tripping via the control board 5. In this embodiment, there are four power-taking devices 4: three at the front end of the low-voltage switch 10, each using one of the three phases of the low-voltage switch's voltage; and one at the rear end of the low-voltage switch 10, used to detect whether the low-voltage switch 10 has successfully closed. In this embodiment, the power-taking device 4 has an embedded magnet for attaching to the fixing bolts. This device is easy to assemble and disassemble; it can be removed from the low-voltage switch 10 when not in use, and when needed, it simply needs to be clipped onto the outer casing of the low-voltage switch 10, with the four power-taking devices 4 attached to their respective positions.

[0044] The hook mechanism 6 includes a hook plate 61, a support plate 62, and a pressure plate 63. The hook plate 61 has hook teeth at its end. One end of the support plate 62 is fixedly connected to the body 1, and the other end of the support plate 62 is connected to the pressure plate 63 by a rotating shaft. One end of the hook plate 61 is connected to the middle section of the pressure plate 63 by a rotating shaft. There are eight hook mechanisms 6, which are distributed at the upper and lower ends of the body 1 respectively.

[0045] The drive device 7 includes a motor and a reduction gear mechanism. The motor in this device can be a DC motor or an AC motor; in this embodiment, a DC motor is used because DC motors have high starting torque, facilitating the rotation of the shaft 2. In this embodiment, the power supply for the drive device 7 is provided by the control board 5.

[0046] The control board 5 includes a microcontroller module, a memory module, a voltage transformer module, a comparator module, and a rectifier module. The microcontroller module is the control center of the control board 5. The voltage transformer module is used to detect the voltage at the front and rear ends of the switch. The comparator module is used to determine whether the drive device 7 is started. The rectifier module is used to provide power to the drive device 7. In this invention, the control board 5 is a microcontroller control board. It collects the voltage signal at the front end of the low-voltage switch 10 through the power module 4, and uses the comparator module to determine whether the voltage at the front end of the low-voltage switch 10 is abnormal. If it is abnormal, it also determines whether the low-voltage switch 10 has tripped due to undervoltage based on the voltage at the rear end of the low-voltage switch. When undervoltage tripping occurs, the control board 5 starts the undervoltage tripping reclosing operation after detecting that the voltage at the front end of the low-voltage switch has returned to normal. In this embodiment of the invention, a delay can be made after the voltage is detected to return to normal to prevent the low-voltage switch from tripping again when the voltage is unstable. When the control board 5 successfully controls the device of the present invention to drive the low-voltage switch to close, the voltage signal is detected by the power supply device 4 at the back end of the low-voltage switch, and the drive device 7 is controlled to stop working, thus completing the low-voltage switch undervoltage tripping and reclosing operation.

[0047] like Figure 9 As shown, the present invention provides an automatic closing method for a low-voltage switch that has tripped due to undervoltage, the automatic closing method comprising the following steps:

[0048] Step a, preparation work: install a low-voltage switch undervoltage trip automatic closing device on the low-voltage switch, and attach each power supply device 4 to the bolts of each terminal of the low-voltage switch by magnetic attraction;

[0049] Step b, determine the tripping status. The control board 5 determines whether the low-voltage switch has tripped and opened based on the voltage detection of the power supply devices 4 at the front and rear ends of the switch. If there is voltage at the front end of the low-voltage switch but no voltage at the rear end, the switch is in the tripped and opened state.

[0050] Step c: Determine the tripping type. The control board 5 determines whether it is a voltage undervoltage trip based on the voltage detection of the four power supply devices 4 at the front end of the low-voltage switch. If an abnormal voltage is detected at the front end of the low-voltage switch, it is a voltage undervoltage trip. If no abnormal voltage is detected at the front end of the low-voltage switch, it is a tripping trip due to other faults.

[0051] Step d: Determine whether the undervoltage fault has been recovered. If the tripping type in step b is undervoltage tripping, then determine whether the undervoltage fault has been recovered by checking the voltage of the four power supply devices 4 at the front end of the low-voltage switch. After the undervoltage fault is eliminated, perform a delay to check if the voltage is qualified, and then start the undervoltage tripping automatic closing procedure.

[0052] Step e, automatic closing operation, the control board 5 outputs the drive device 7 to act, under the action of the drive device 7, the second gear 32 and the first gear 31 are driven to rotate in sequence, thereby driving the ratchet 33 to rotate, and then the rotating shaft 2 drives the closing mechanism of the low voltage switch to close.

[0053] Step f: Determine the closing result. According to step d, the low-voltage switch starts the closing action under the drive of the rotating shaft 2. When the low-voltage switch is successfully closed, the power supply device 4 at the back end of the low-voltage switch detects the voltage, which means that the low-voltage switch is successfully closed. At this time, the control board 5 controls the drive device 7 to stop rotating, and the automatic closing operation is completed.

[0054] Of course, the above embodiments are not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A method for closing a low-voltage switch, characterized in that: The closing method is based on a closing device, which includes a body (1), a rotating shaft (2), a transmission mechanism (3), a power supply device (4), and a control board (5). The closing method includes the following steps: Step a, Preparation A closing device is installed on a low-voltage switch, and each power-taking device (4) is fixedly connected to the bolts of each terminal of the low-voltage switch; the power-taking device (4) includes a housing (41), a magnet (42), a power-taking needle (43) and a handle (44), the handle (44) is provided on the housing (41), the magnet (42) is embedded in the housing (41), and the power-taking needle (43) is connected to the control board (5) by wires; the housing (41) is provided with a probe groove (46), the power-taking needle (43) is provided in the probe groove (46) and slides freely along the probe groove (46); the end of the power-taking needle (43) extends out of the housing (41), and a spring (45) is provided on the power-taking needle (43), the spring (45) causes the power-taking needle (43) to move away from the probe groove (46); the power-taking device (4) is magnetically attracted to each terminal of the low-voltage switch by the magnet (42); Step b, determine if the tripping has occurred. The control board (5) determines whether the low-voltage switch has tripped and opened based on the voltage detection of the power taking devices (4) at the front and rear ends of the switch. If there is voltage at the front end of the low-voltage switch but no voltage at the rear end, the switch is in the tripped and opened state. Step c, determine the tripping type The control board (5) determines whether the trip is due to undervoltage based on the voltage detection of the four power supply devices (4) at the front end of the low-voltage switch. If an abnormal voltage is detected at the front end of the low-voltage switch, the trip is due to undervoltage. If no abnormal voltage is detected at the front end of the low-voltage switch, the trip is due to other faults. Step d: Determine if the pressure loss fault has been resolved. When the tripping type in step c above is undervoltage tripping, the voltage detection status of the four power taking devices (4) at the front end of the low voltage switch is used to determine whether the undervoltage fault has been restored; after the undervoltage fault is eliminated, a delay is made for a period of time to detect that the voltage is qualified, and then the undervoltage tripping automatic closing procedure is started. Step e, automatic closing operation The control board (5) outputs control to drive the device (7) to operate. The drive device (7) is located on one side of the transmission mechanism (3). The transmission mechanism (3) includes a first gear (31), a second gear (32), and a ratchet (33). The first gear (31) and the second gear (32) are meshed together. The ratchet (33) is sleeved inside the first gear (31). The ratchet (33) rotates coaxially with the first gear (31). The first gear (31) is provided with a fixing pin (34). The fixing pin (34) is provided with a pawl (35). The pawl (35) abuts against the ratchet (33). The second gear (32) is fixedly connected to the output shaft of the drive device (7). Under the action of the drive device (7), the second gear (32) and the first gear (31) are driven to rotate in sequence, thereby driving the ratchet (33) to rotate. Then the rotating shaft (2) drives the closing mechanism of the low-voltage switch to close. Step f: Determine the closing result. According to step e, the low-voltage switch starts the closing action under the drive of the rotating shaft (2). When the low-voltage switch is successfully closed, the power taking device (4) at the back end of the low-voltage switch detects the voltage, which means that the low-voltage switch is successfully closed. At this time, the drive device (7) is controlled to stop rotating by the control board (5) to complete the automatic closing operation.

2. The low-voltage switch closing method according to claim 1, characterized in that: The main body (1) is provided with several hook mechanisms (6), which are used to fix the main body (1) and the low-voltage switch; the rotating shaft (2) passes through the main body (1), and the transmission mechanism (3) passes through the rotating shaft (2); the hook mechanism (6) includes a hook plate (61), a support plate (62) and a pressure plate (63), the end of the hook plate (61) is provided with hook teeth, one end of the support plate (62) is fixedly connected to the main body (1), the other end of the support plate (62) is connected to the rotating shaft of the pressure plate (63), and one end of the hook plate (61) is connected to the middle section of the rotating shaft of the pressure plate (63); there are eight hook mechanisms (6), which are distributed at the upper and lower ends of the main body (1).

3. The low-voltage switch closing method according to claim 1, characterized in that: In step e, there may be one, two, three or four fixing pins (34), and a torsion spring (36) is fitted on the fixing pin (34). One end of the torsion spring (36) is fixedly connected to the first gear (31), and the other end of the torsion spring (36) is fixedly connected to the pawl (35).

4. The low-voltage switch closing method according to claim 1, characterized in that: In step e, the ratchet (33) is welded to the shaft (2) for a fixed connection, or is keyed or pinned, and the first gear (31) is connected to the shaft (2) for a bearing connection.

5. A low-voltage switch closing method according to claim 1, characterized in that: In step e, the outer end of the rotating shaft (2) is provided with an internal hexagonal cylindrical head (21), and the inner end of the rotating shaft (2) is provided with a hexagonal square head (22). The internal hexagonal cylindrical head (21) is used to abut against the internal hexagonal wrench, and the hexagonal square head (22) is used to abut against the low-voltage switch.

Images