Automatic spring pressing device for spring mechanism and operating method

Abstract

The application relates to an automatic spring pressing device for a spring mechanism, which comprises detachably connected support units and a spring pressing outer cylinder, the support units are provided with a plurality of top rods arranged in the circumferential direction and having top ends supporting a spring pressing plate of the spring pressing outer cylinder, and a driving device for driving the plurality of top rods to synchronously slide in the height direction. In use, the plurality of top rods are driven by the driving device to synchronously slide in the height direction, so that the plurality of top rods can all play a compression role, stress concentration is avoided, and damage of the spring pressing plate is avoided; the third electric push rod is arranged to drive the screwing motor and the screwing sleeve to extend in the height direction, the screwing motor drives the screwing sleeve to rotate, and the inner nut is driven to move in the height direction under the action of the screwing motor and the third electric push rod.

Description

Technical Field

[0001] This invention relates to the field of maintenance of high-voltage circuit breaker operating mechanisms, and more particularly to the field of automatic spring compression device technology, specifically an automatic spring compression device for a spring mechanism and its operating method. Background Technology

[0002] The spring mechanism is the core unit for high-voltage circuit breakers to complete rapid opening and closing actions. It is widely used in the power transmission and transformation industry. As the number of switching operations increases, the opening and closing springs in the spring mechanism become fatigued and their mechanical characteristics fail to meet the standards. At this time, it is necessary to replace the opening and closing springs in a timely manner.

[0003] In the existing technology, a compression spring presses against a compression spring plate, and two screws support the compression spring plate. Then, the two screws are manually rotated alternately to compress the opening and closing spring pressure plate. This construction method is time-consuming and labor-intensive. Moreover, when the screws are rotated alternately, only one screw plays a compression role, which can easily cause damage to the compression spring base plate due to stress concentration. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an automatic compression spring device and operating method for a spring mechanism. It uses multiple push rods to support the compression spring plate and allows multiple compression springs to slide simultaneously, so that all the push rods can exert a compression effect, avoiding stress concentration and damage to the compression spring plate.

[0005] The present invention is achieved through the following technical solution: an automatic compression spring device for a spring mechanism, comprising a detachably connected support unit and a compression spring outer cylinder, characterized in that: the support unit is provided with a plurality of top rods arranged circumferentially and whose top ends are all supported on the compression spring plate of the compression spring outer cylinder, and a driving device for driving the plurality of top rods to slide synchronously along the height direction.

[0006] In use, the present invention drives several push rods to slide synchronously along the height direction through a driving device, so that multiple push rods can play a compression role, avoiding stress concentration and damage to the compression spring plate.

[0007] Preferably, the driving device includes a gear ring rotatably connected to the support unit, a sun gear located inside the gear ring, and planet gears meshing with the sun gear and the gear ring respectively. The planet gears are shafted onto the planet carrier, and a lead screw is fixedly connected to the planet gear, which is coaxial with the planet gear and corresponds to the push rod. The lead screw is threaded onto the corresponding push rod. The support unit is also provided with a first limiting device for limiting the rotation of the gear ring and a second limiting device for limiting the rotation of the planet carrier. The support unit is also provided with a first motor that drives the sun gear to rotate.

[0008] As a preferred embodiment, this preferred embodiment restricts the rotation of the gear ring and planetary carrier by setting the first limiting device and the second limiting device, thereby increasing the torque or speed of the lead screw rotation, and thus changing the sliding speed of the compression spring plate.

[0009] Preferably, the first limiting device includes a first electric push rod disposed on the support unit and whose extended end moves radially along the gear ring. The extended end of the first electric push rod is provided with a first limiting pin. The outer circumferential surface of the gear ring is provided with first grooves evenly arranged in the circumferential direction for the first limiting pin to be inserted.

[0010] This preferred solution achieves the restriction of the gear ring by setting the first limit pin to move in and out of the first groove through the first electric push rod.

[0011] Preferably, the second limiting device includes a second electric push rod disposed on the support unit and whose extended end moves radially along the rotating cylinder of the planetary carrier. The extended end of the second electric push rod is provided with a second limiting pin. The outer circumferential surface of the rotating cylinder is provided with a second groove evenly arranged in the circumferential direction for the second limiting pin to be inserted.

[0012] This preferred embodiment uses a second electric push rod to move a second limit pin in and out of a second groove to restrict the planetary carrier.

[0013] Preferably, the top end of each push rod is fixedly connected to a bull's eye bearing that supports the compression spring plate.

[0014] This preferred solution reduces wear on the push rod and compression spring plate by using a bullseye bearing, and facilitates the rotational connection between the push rod and the compression spring plate.

[0015] Preferably, the support unit is further provided with a sleeve, and the top rod is located inside the sleeve.

[0016] This preferred solution protects the push rod by using a sleeve.

[0017] Preferably, the sleeve is provided with an automatic screwing unit located between the push rods. The automatic screwing unit includes a third electric push rod connected to the sun gear and extending upward, a screwing motor fixed to the extending end of the third electric push rod, and a screwing sleeve fixed to the output shaft of the screwing motor and facing the nut inside the outer cylinder of the compression spring.

[0018] This preferred solution uses a third electric push rod to drive the screw motor and screw sleeve to extend along the height direction. The screw motor drives the screw sleeve to rotate, and under the action of the screw motor and the third electric push rod, the inner nut moves along the height direction.

[0019] Preferably, a pressure sensor is provided on the top surface of the push rod, located between the bullseye bearing and the push rod.

[0020] This preferred solution uses a pressure sensor. When the pressure sensor reaches a certain pressure, it drives the third electric push rod to extend, which in turn drives the screw motor to rotate the screw sleeve, causing the inner nut of the outer sleeve of the compression spring to be inserted into the screw sleeve. Then, while continuing to drive the third electric push rod to extend, it drives the screw motor to rotate the inner nut upward, thereby realizing the installation of the inner nut.

[0021] Preferably, the device also includes several spacer rods that connect the outer cylinder of the compression spring and the support unit and are evenly arranged circumferentially. Two support nuts for fixing the support unit and a compression spring nut for fixing the outer cylinder of the compression spring are threaded onto the spacer rods.

[0022] This preferred solution uses a spacer rod to fix the support unit and the outer cylinder of the compression spring, and uses a nut to facilitate adjustment of the distance between the outer cylinder of the compression spring and the support unit.

[0023] An operating method for an automatic compression spring device for a spring mechanism includes the following steps: During disassembly, the third electric push rod is extended, which in turn drives the screw motor to rotate the screw sleeve, so that the inner nut of the outer sleeve of the compression spring is inserted into the screw sleeve. Then, while the third electric push rod is retracted, the screw motor is driven to rotate the inner nut downward, thereby realizing the disassembly of the inner nut. The push rod drives the bullseye bearing to support the compression spring plate. The first limiting device restricts the rotation of the gear ring. When the second limiting device does not restrict the rotation of the planetary carrier, it drives the first motor to drive the sun gear to rotate, thereby driving the planet gears to rotate. The simultaneous rotation of several planet gears drives several lead screws to rotate simultaneously, thereby driving several push rods to retract simultaneously. Conversely, during installation, when the first limiting device restricts the rotation of the gear ring and the second limiting device does not restrict the rotation of the planetary carrier, the first motor drives the sun gear to rotate, thereby causing the planetary gears to revolve around the sun gear while simultaneously rotating on their own axis. The simultaneous rotation of several planetary gears drives several lead screws to rotate simultaneously, thereby causing several push rods to extend simultaneously. As the compression spring plate moves upward to compress the compression spring inside the outer cylinder, the structural torque of the planetary gears increases while the sun gear drives the planetary gears to rotate and revolve, increasing the rotational torque of the lead screws, thus gradually increasing the elastic force brought by the compression spring. As the compression spring plate rises, the spring force on it increases. Since the spring force is constant at a given length, meaning the pressure sensor receives a constant pressure, the pressure sensor reaches a certain pressure after the compression spring plate rises a certain distance. At this point, the inner nut needs to be turned in reverse. The pressure sensor transmits a signal to the control console, which then drives the first motor to stop rotating and simultaneously extends the third electric push rod. Correspondingly, the distance between the compression spring plate and the turning sleeve, as well as the distance between the turning sleeve and the inner nut, are constant. The inner nut is screwed onto the bottom end of the inner screw inside the outer cylinder of the compression spring. Therefore, the first... The extension length of the three electric push rods enables the connection between the screwing sleeve and the inner nut. The screwing motor drives the screwing sleeve to rotate, allowing the inner nut of the outer sleeve of the compression spring to be inserted into the screwing sleeve. Then, while continuing to drive the third electric push rod to extend, the screwing motor drives the inner nut to rotate upward. The distance the third electric push rod extends is the screwing depth of the inner nut. The screwing motor is equipped with a torque sensor. When the inner nut is screwed into place, the torque sensor transmits a signal to the control console. The control console stops the rotation of the third electric push rod and the screwing motor, thus completing the installation of the inner nut. Finally, the third electric push rod is driven to retract and reset.

[0024] The beneficial effects of this invention are as follows: The driving device drives several push rods to slide synchronously along the height direction, thereby enabling all push rods to exert a compression effect, avoiding stress concentration and damage to the compression spring plate; the first and second limiting devices restrict the rotation of the gear ring and planetary carrier, thereby increasing the torque or speed of the lead screw rotation, thus changing the sliding speed of the compression spring plate; the third electric push rod drives the turning motor and turning sleeve to extend along the height direction, and the turning motor drives the turning sleeve to rotate. Under the action of the turning motor and the third electric push rod, the inner nut moves along the height direction. Attached Figure Description

[0025] Figure 1 This is a three-dimensional schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the main structure of the present invention; Figure 3 for Figure 2 Schematic diagram of the cross-section at point AA; Figure 4 for Figure 3 Enlarged view of point B in the middle; Figure 5 for Figure 3 Enlarged view of point E in the middle; Figure 6 for Figure 2 Schematic diagram of the cross-section at point C; Figure 7 This is a three-dimensional schematic diagram of a portion of the structure of the present invention; Figure 8 This is a schematic diagram of the console logic; As shown in the figure: 1. Drive unit; 2. Push rod; 3. Support unit; 4. Automatic screwing unit; 5. Compression spring outer cylinder; 11. First motor; 12. Planetary gear; 13. Sun gear; 14. First electric push rod; 15. Second electric push rod; 16. Gear ring; 17. First limit pin; 21. Lead screw; 22. Bullseye bearing; 31. Fixed frame; 32. Spacer rod; 33. Compression spring nut; 34. Sleeve; 41. Third electric push rod; 42. Screw motor; 43. Screw sleeve; 44. Connecting block; 51. Compression spring plate; 52. Inner nut. Detailed Implementation

[0026] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0027] See attached document Figure 1-8 This invention discloses an automatic compression spring device and operating method for a spring mechanism. A compression spring is provided inside a compression spring outer cylinder 5, and a compression spring plate 51 is provided to restrict the compression spring. An inner screw rod is provided inside the compression spring outer cylinder 5, which penetrates downward through the compression spring plate 51. The inner screw rod is threadedly connected to an inner nut 52 located below the compression spring outer cylinder. A fastening nut is provided between the inner nut and the compression spring plate. The fastening nut is threadedly connected to the inner screw rod. A washer is also provided between the fastening nut and the compression spring plate. The compression spring drives the compression spring plate to move downward. The compression spring plate drives the inner screw rod to move downward through the washer and the fastening nut. The compression spring outer cylinder, the inner screw rod, and the compression spring plate are all prior art.

[0028] The lower end of the compression spring outer cylinder 5 is provided with a support unit 3. The support unit 3 includes a fixed frame 31. The fixed frame 31 and the compression spring outer cylinder 5 are connected by several spacers 32. The spacers 32 are evenly arranged in the circumferential direction. Two support nuts located on the top and bottom surfaces of the fixed frame 31 are threaded onto the spacers 32. Side ears are provided on the circumferential surface of the compression spring outer cylinder 5. The spacers 32 pass through the side ears in the height direction. Compression spring nuts 33 that are threadedly connected to the spacers 32 are provided on the top and bottom surfaces of the side ears.

[0029] Three push rods 2 are also provided between the support unit 3 and the compression spring plate 51. The top surface of the push rod 2 is provided with a bullseye bearing 22 that supports the compression spring plate 51. The top surface of the push rod 2 is also provided with a pressure sensor that supports the bullseye bearing 22. That is, the top surface of the push rod 2 is provided with a pressure sensor located between the bullseye bearing 22 and the push rod 2.

[0030] The fixed frame 31 is also provided with a driving device 1. The driving device 1 includes a gear ring 16 rotatably connected to the fixed frame. The outer circumferential surface of the gear ring 16 is provided with a rotating ring inserted into the fixed frame 31. The bottom surface of the rotating ring is provided with an annular slider. The fixed frame 31 is provided with an annular groove that slides with the slider. The fixed frame 31 is also provided with a first limiting device that restricts the rotation of the gear ring 16. The first limiting device includes a first electric push rod 14 provided on the support unit 3 and whose protruding end moves radially along the gear ring 16. The protruding end of the first electric push rod 14 is provided with a first limiting pin 17. The outer circumferential surface of the gear ring 16 is provided with first grooves evenly arranged circumferentially for the first limiting pin 17 to be inserted.

[0031] The ring gear 16 contains a sun gear 13 and a planet gear 12 that meshes with the sun gear 13 and the ring gear 16. The planet gear 12 is axially connected to the planet carrier. The fixed frame 31 is also provided with a second limiting device to restrict the rotation of the planet carrier. The second limiting device includes a second electric push rod 15 that is set on the support unit 3 and whose protruding end moves radially along the planet carrier cylinder. The protruding end of the second electric push rod 15 is provided with a second limiting pin. The outer circumferential surface of the cylinder is provided with second grooves that are evenly arranged circumferentially and are for the insertion of the second limiting pin.

[0032] The fixed frame 31 is still equipped with a first motor 11 that drives the sun gear 13 to rotate.

[0033] The planetary gear 12 is also connected to an upwardly extending lead screw 21 that is threaded to the push rod 2. The sun gear 13, the inner nut 52, and the compression spring plate 51 are arranged coaxially. A sleeve 34 is provided on the fixed frame 31. The top rod 2 is located inside the sleeve 34. An automatic screwing unit 4 is provided inside the sleeve 34 between the top rods 2. The automatic screwing unit 4 includes a third electric push rod 41 connected to the sun gear 13 and extending upward, a screwing motor 42 fixed to the extending end of the third electric push rod 41, and a screwing sleeve 43 fixed to the output shaft of the screwing motor 42 and facing the nut 52 inside the outer cylinder 5 of the compression spring. The third electric push rod 41 is connected to the sun gear 13 through a connecting block 44.

[0034] The pressure sensor, the first motor 11, the first electric push rod 14, the second electric push rod 15, the third electric push rod 41, and the rotary motor 42 are all electrically connected to the control console. The control console includes a microcontroller. The control console is existing technology. The control console can also be used to manually operate and control the actions of the first motor 11, the first electric push rod 14, the second electric push rod 15, the third electric push rod 41, and the rotary motor 42.

[0035] An operating method for an automatic compression spring device for a spring mechanism includes the following steps: During disassembly, the third electric push rod 41 is extended, thereby driving the screw motor 42 to rotate the screw sleeve 43, so that the inner nut 52 of the outer sleeve 5 of the compression spring is inserted into the screw sleeve 43. Then, while the third electric push rod 41 is retracted, the screw motor 42 is driven to rotate the inner nut 52 downward, thereby realizing the disassembly of the inner nut 52. The push rod 2 drives the bullseye bearing 22 to support the compression spring plate 51. The first limiting device restricts the rotation of the gear ring 16. When the second limiting device does not restrict the rotation of the planetary carrier, the first motor 11 drives the sun gear 13 to rotate, thereby driving the planet gear 12 to rotate. The simultaneous rotation of several planet gears 12 drives several lead screws 21 to rotate simultaneously, thereby driving several push rods 2 to retract simultaneously. Conversely, during installation, when the first limiting device restricts the rotation of the gear ring 16 and the second limiting device does not restrict the rotation of the planetary carrier, the first motor 11 drives the sun gear 13 to rotate, thereby driving the planet gears 12 to revolve around the sun gear 13 while the planet gears 12 rotate on their own axis. The simultaneous rotation of several planet gears 12 drives several lead screws 21 to rotate simultaneously, thereby driving several push rods 2 to extend simultaneously. As the compression spring plate 51 moves upward to compress the compression spring inside the compression spring outer cylinder 5, the structural torque of the planet gears 12 increases while the sun gear 13 drives the planet gears 12 to rotate and revolve, increasing the rotational torque of the lead screws 21, thereby gradually increasing the elastic force brought by the compression spring. As the spring plate 51 rises, the spring force on it increases. Since the spring force is constant at a certain length, meaning the pressure sensor receives a constant pressure, the pressure sensor reaches a certain pressure after the spring plate 51 rises a certain distance. At this point, the inner nut 52 needs to be turned in reverse. The pressure sensor transmits a signal to the control console, which drives the first motor 11 to stop rotating and simultaneously drives the third electric push rod 41 to extend. Correspondingly, the distance between the spring plate 51 and the turning sleeve 43, and the distance between the turning sleeve 43 and the inner nut 52, are constant. The inner nut 52 is screwed onto the bottom end of the inner screw inside the outer sleeve 5 of the spring. Therefore, the third electric push rod 41 can be determined. The extension length is sufficient to connect the screwing sleeve 43 and the inner nut 52. The screwing motor 42 is driven to rotate the screwing sleeve 43, so that the inner nut 52 of the outer sleeve 5 of the compression spring is inserted into the screwing sleeve 43. Then, while continuing to drive the third electric push rod 41 to extend, the screwing motor 42 is driven to rotate the inner nut 52 upward. The distance the third electric push rod 41 extends is the screwing depth of the inner nut 52. The screwing motor 42 is equipped with a torque sensor. When the inner nut 52 is screwed into place, the torque sensor transmits a signal to the control console. The control console stops the rotation of the third electric push rod 41 and the screwing motor 42 to realize the installation of the inner nut 52. Finally, the third electric push rod 41 is driven to retract and reset.

[0036] Of course, the above description is not limited to the examples above. Technical features not described in this invention can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solutions of this invention and are not intended to limit this invention. This invention has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this invention do not depart from the spirit of this invention and should also fall within the scope of protection of the claims of this invention.

Claims

1. An automatic compression spring device for a spring mechanism, comprising a detachably connected support unit (3) and a compression spring outer cylinder (5), characterized in that: The support unit (3) is provided with a number of top rods (2) arranged circumferentially and supported at the top of the compression spring plate (51) on the compression spring outer cylinder (5), and a drive device (1) that drives the number of top rods (2) to slide synchronously in the height direction. The drive device (1) includes a gear ring (16) rotatably connected to the support unit (3), a sun gear (13) located in the gear ring (16), and planet gears (12) meshing with the sun gear (13) and the gear ring (16) respectively. The planet gears (12) are axially connected to the planet carrier. A lead screw (21) is fixedly connected to the planet gear and is coaxially arranged with it and corresponding to the push rod (2). The lead screw (21) is threadedly connected to the corresponding push rod (2). The support unit (3) is also provided with a first limiting device for limiting the rotation of the gear ring (16) and a second limiting device for limiting the rotation of the planet carrier. The support unit (3) is also provided with a first motor (11) that drives the sun gear (13) to rotate.

2. The automatic spring compression device for the spring mechanism according to claim 1, characterized in that: The first limiting device includes a first electric push rod (14) disposed on the support unit (3) and whose extended end moves radially along the gear ring (16). The extended end of the first electric push rod (14) is provided with a first limiting pin (17). The outer circumferential surface of the gear ring (16) is provided with a first groove evenly arranged in the circumferential direction for the first limiting pin (17) to be inserted.

3. The automatic compression spring device for the spring mechanism according to claim 1 or 2, characterized in that: The second limiting device includes a second electric push rod (15) disposed on the support unit (3) and whose extended end moves radially along the rotating cylinder of the planetary carrier. The extended end of the second electric push rod (15) is provided with a second limiting pin. The outer circumferential surface of the rotating cylinder is provided with a second groove that is evenly arranged in the circumferential direction and is used for the insertion of the second limiting pin.

4. The automatic spring compression device for the spring mechanism according to claim 3, characterized in that: The top of each of the top rods (2) is fixed with a bull's eye bearing (22) that supports the compression spring plate (51).

5. The automatic spring compression device for the spring mechanism according to claim 4, characterized in that: The support unit (3) is also provided with a sleeve (34), and the top rod (2) is located inside the sleeve (34).

6. The automatic spring compression device for the spring mechanism according to claim 5, characterized in that: The sleeve (34) is provided with an automatic screwing unit (4) located between the top rods (2). The automatic screwing unit (4) includes a third electric push rod (41) connected to the sun gear (13) and extending upward, a screwing motor (42) fixed to the extending end of the third electric push rod (41), and a screwing sleeve (43) fixed to the output shaft of the screwing motor (42) and facing the inner nut (52) of the outer sleeve (5) of the compression spring.

7. The automatic compression spring device for the spring mechanism according to claim 6, characterized in that: A pressure sensor is provided on the top surface of the push rod (2) between the bullseye bearing (22) and the push rod (2).

8. The automatic spring compression device for the spring mechanism according to claim 7, characterized in that: It also includes several spacer rods (32) that connect the outer cylinder of the compression spring (5) and the support unit (3) and are evenly arranged in the circumferential direction. The spacer rods (32) are threaded with two support nuts that fix the support unit (3) and a compression spring nut (33) that fixes the outer cylinder of the compression spring (5).

9. The operating method of the automatic compression spring device for the spring mechanism according to claim 8, characterized in that, Includes the following steps: During disassembly, the third electric push rod (41) is extended, thereby driving the screw motor (42) to rotate the screw sleeve (43), so that the inner nut (52) of the outer sleeve (5) of the compression spring is inserted into the screw sleeve (43). Then, while the third electric push rod (41) is retracted, the screw motor (42) is driven to rotate the inner nut (52) downward, thereby realizing the disassembly of the inner nut (52). The push rod (2) drives the bullseye bearing (22) to support the compression spring plate (51). The first limiting device restricts the rotation of the gear ring (16). When the second limiting device does not restrict the rotation of the planetary carrier, it drives the first motor (11) to drive the sun gear (13) to rotate, thereby driving the planet gear (12) to rotate. The simultaneous rotation of several planet gears drives several lead screws (21) to rotate at the same time, thereby driving several push rods (2) to retract at the same time. Conversely, during installation, when the first limiting device restricts the rotation of the gear ring (16) and the second limiting device does not restrict the rotation of the planetary carrier, the first motor (11) drives the sun gear (13) to rotate, thereby driving the planetary gear (12) to revolve around the sun gear (13). At the same time, the planetary gear (12) rotates on its own axis. The simultaneous rotation of several planetary gears drives several lead screws (21) to rotate simultaneously, thereby driving several push rods (2) to extend simultaneously. Since the compression spring plate (51) moves upward to compress the compression spring in the outer cylinder (5), the structural torque of the planetary gear (12) increases while the sun gear (13) drives the planetary gear (12) to rotate and revolve. This increases the rotational torque of the lead screw (21), thereby gradually increasing the elastic force brought by the compression spring. As the spring plate (51) rises, the spring force on the spring plate increases. Since the spring force is constant at a certain length, the pressure obtained by the pressure sensor is constant. Therefore, when the spring plate rises a certain distance, the pressure sensor reaches a certain pressure. At this time, the inner nut needs to be screwed in reverse. The pressure sensor transmits the signal to the control console, which drives the first motor to stop rotating and simultaneously drives the third electric push rod (41) to extend. Correspondingly, the distance between the spring plate and the screwing sleeve and the distance between the screwing sleeve and the inner nut are constant. The inner nut is screwed into the bottom end of the inner screw inside the outer sleeve (5) of the spring plate. Therefore, the third electric push rod can be determined. The extension length of the rod enables the connection between the screwing sleeve and the inner nut. The screwing motor (42) drives the screwing sleeve (43) to rotate, so that the inner nut (52) of the outer sleeve (5) of the compression spring is inserted into the screwing sleeve (43). Then, while continuing to drive the third electric push rod to extend, the screwing motor drives the inner nut to rotate upward. The extension distance of the third electric push rod is the screwing depth of the inner nut. The screwing motor is equipped with a torque sensor. When the inner nut is screwed into place, the torque sensor transmits the signal to the control console. The control console stops the rotation of the third electric push rod and the screwing motor to realize the installation of the inner nut. Finally, the third electric push rod is driven to retract and reset.

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