Lifting appliance for partition plate of steam turbine

Abstract

The utility model relates to a steam turbine partition plate lifting appliance which comprises a first clamping rod, a second clamping rod and a first elastic piece, and a first clamping part and a first lifting part are arranged at the two ends of the first clamping rod respectively; the second clamping rod and the first clamping rod form an X shape, the middle of the second clamping rod is hinged to the middle of the first clamping rod, a second clamping part and a second hoisting part are arranged at the two ends of the second clamping rod respectively, and the second hoisting part and the first hoisting part are oppositely arranged and used for allowing a hoisting belt to penetrate through. The second clamping part and the first clamping part are oppositely arranged and are used for jointly clamping the steam turbine partition plate; the first elastic piece is connected with the first clamping rod and the second clamping rod and used for applying elastic force enabling the first clamping part and the second clamping part to be close to each other to the first clamping rod and the second clamping rod. Before lifting, the first clamping part and the second clamping part can be kept in a clamping state for the turbine partition plate through the first elastic piece, and the lifting appliance is prevented from being separated from the turbine partition plate.

Description

Technical Field

[0001] The utility model relates to the technical field of steam turbine hoisting equipment, in particular to a steam turbine partition hoist. Background Art

[0002] In the related art, the transportation of steam turbine parts needs to be completed with the help of lifting equipment to improve the convenience of lifting.

[0003] For the hoisting of a steam turbine partition, a patent document with a publication number of CN207608201U discloses a steam turbine partition lifting tool, in which a hoist includes a hoisting clamp A and a hoisting clamp B which are cross-connected by a connecting rod. When in use, one end of a sling is passed through a sling stopper A at the upper end of the sling A and a sling stopper B at the upper end of the sling B, and the other end is hung on a hook; the sling A is separated from the sling B, and the sling is opened so that the hoisting stopper A on the inner side of the lower end of the sling A and the hoisting stopper B on the inner side of the lower end of the sling B enter the hoisting holes on both sides of the steam turbine partition respectively; after installation, the hook is lifted to tighten the sling, and the sling will tighten the sling stopper A and the sling stopper B on the hoist, so that the sling A and the sling B clamp the steam turbine partition, and the hook continues to rise, and the hoisting stopper A and the hoisting stopper B are stuck in the hoisting holes on both sides of the steam turbine partition, and the steam turbine partition is hoisted.

[0004] However, in actual use, the hoist still separates from the partition. Especially before lifting, that is, when the turbine partition hoist is just matched with the turbine partition, the sling has not yet pulled the hoist upward, and the sling has not tightened the sling stopper A and the sling stopper B on the hoist to make the clamp clamp the turbine partition. At this time, the hoisting stopper A and the hoisting stopper B cannot be fixed in the lifting holes on both sides of the turbine partition, and are easy to fall off from the lifting holes, resulting in the sling and the turbine partition falling off during the subsequent lifting process, and the turbine partition cannot be lifted, affecting the lifting efficiency and reliability. Utility Model Content

[0005] The utility model aims to provide a steam turbine diaphragm lifting device to solve the problem that the existing steam turbine diaphragm lifting device is easy to fall off from the steam turbine diaphragm during the lifting process of the steam turbine diaphragm.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a turbine partition hanger, which includes a first clamping rod, a second clamping rod and a first elastic member, the first clamping rod is respectively provided with a first clamping portion and a first lifting portion at both ends; the second clamping rod and the first clamping rod form an X shape, and the middle part of the second clamping rod is hinged to the middle part of the first clamping rod, the second clamping portion and the second lifting portion are respectively provided at both ends of the second clamping rod, the second lifting portion is arranged opposite to the first lifting portion and is used for a sling to pass through, and the second clamping portion is arranged opposite to the first clamping portion and is used to jointly clamp the turbine partition; the first elastic member connects the first clamping rod and the second clamping rod, and the first elastic member is used to apply an elastic force to the first clamping rod and the second clamping rod that can bring the first clamping portion and the second clamping portion close to each other.

[0007] Optionally, the turbine partition hanger also includes a rotating shaft, and the first clamping rod and the second clamping rod are hinged through the rotating shaft; the first elastic member is a torsion spring, and the torsion spring is sleeved on the rotating shaft, one end of the torsion spring is connected to the first clamping rod, and the other end of the torsion spring is connected to the second clamping rod.

[0008] Optionally, the rotating shaft is fixed to the first clamping rod, and the second clamping rod is rotatably mounted on the rotating shaft, and the rotating shaft has a protrusion protruding from the second clamping rod in a direction away from the first clamping rod; the turbine partition hanger also includes a shaft cap, which is fixed on the side of the second clamping rod away from the first clamping rod and is mounted on the outside of the protrusion, and the torsion spring is mounted on the protrusion, one end of the torsion spring is fixed to the protrusion, and the other end of the torsion spring is fixed to the shaft cap.

[0009] Optionally, the steam turbine partition hanger also includes a rotating shaft, which is fixed to the first clamping rod, and the second clamping rod is rotatably mounted on the rotating shaft, and the rotating shaft has a locking portion, which is located on the side of the second clamping rod away from the first clamping rod, and the locking portion is provided with a plug-in hole extending radially along the rotating shaft; the steam turbine partition hanger also includes a locking mechanism, which is arranged on the side of the second clamping rod away from the first clamping rod, and the locking mechanism includes a plug-in component, which is movably installed on the locking mechanism along the radial direction of the rotating shaft, and one end of the plug-in component can be inserted into or removed from the plug-in hole.

[0010] Optionally, the locking mechanism further includes a second elastic member, and the second elastic member is used to apply an elastic force to the connector to move it toward the connector hole.

[0011] Optionally, the locking mechanism also includes a guide sleeve and a guide member, the guide sleeve extends radially along the rotating shaft and is fixed to the second clamping rod, the guide member is movably arranged in the guide sleeve, the connector is connected to the guide member, one end of the second elastic member is connected to the guide sleeve, and the other end of the second elastic member is connected to the connector.

[0012] Optionally, a guide rod is provided on the connector, the second elastic member is sleeved on the guide rod, a baffle is provided on the guide sleeve, a through hole is opened on the baffle, the guide rod is movably inserted into the through hole, and one end of the second elastic member is connected to the baffle.

[0013] Optionally, the connector includes a first section and a second section connected to each other, the first section extends along the radial direction of the rotating shaft and is used to be inserted into the connecting hole, and the second section extends along the axial direction of the rotating shaft and is connected to the guide member.

[0014] Optionally, an operating portion is provided at one end of the guide member away from the connector, and the operating portion is used to operate the guide member to move so that the guide member drives the connector to move.

[0015] Optionally, there are a plurality of the plugging holes, which are arranged at intervals along the circumference of the rotating shaft, and the connector can be inserted into any of the plugging holes.

[0016] Through the above technical solution, the lifting belt of the lifting equipment can be passed through the first lifting part and the second lifting part, and then the first clamping part and the second clamping part are clamped on both sides of the steam turbine diaphragm. Since the first elastic member can apply an elastic force to the first clamping rod and the second clamping rod that can make the first clamping part and the second clamping part approach each other, the first clamping part and the second clamping part can maintain the clamping of the steam turbine diaphragm under the action of the first elastic member, so that before and during the lifting, the first clamping part and the second clamping part can always maintain the clamping of the steam turbine diaphragm to prevent the lifting device from being separated from the steam turbine diaphragm.

[0017] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation to the present invention. In the accompanying drawings:

[0019] Figure 1 It is a three-dimensional structural schematic diagram of a steam turbine diaphragm hanger provided by an exemplary embodiment of the utility model;

[0020] Figure 2 is a front view of a steam turbine diaphragm hanger provided by an exemplary embodiment of the utility model;

[0021] Figure 3 yes Figure 2 Schematic diagram of the cross-sectional structure at AA in the middle;

[0022] Figure 4 is a schematic structural diagram of a rotating shaft provided by an exemplary embodiment of the utility model;

[0023] Figure 5 It is a structural schematic diagram of a locking mechanism provided by an exemplary embodiment of the utility model.

[0024] Description of Reference Numerals

[0025] 100 - first clamping rod; 110 - first clamping portion; 120 - first hoisting portion;

[0026] 200 - second clamping rod; 210 - second clamping portion; 220 - second lifting portion; 230 - shaft cap;

[0027] 300-rotating shaft; 310-protruding portion; 320-locking portion; 321-insertion hole;

[0028] 400-first elastic member;

[0029] 500-locking mechanism; 510-connector; 511-guide rod; 512-first section; 513-second section; 520-second elastic member; 530-guide sleeve; 531-baffle; 540-guide member; 541-operating part. DETAILED DESCRIPTION

[0030] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0031] In the description of the present invention, it should be understood that the terms "upper", "lower", etc. indicating the orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, and a specific orientation structure and operation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "inside and outside" refer to the inside and outside of the corresponding structural contour. In addition, the terms "first", "second", etc. are only used to distinguish one element from another, and do not have order and importance.

[0032] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connect", "connected", and "installed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] Because the existing turbine partition hanger may fall off from the turbine partition before lifting, that is, when the turbine partition hanger just cooperates with the turbine partition and the hanger has not yet pulled the turbine partition hanger upward to clamp the turbine partition, the turbine partition hanger may fall off from the turbine partition. Therefore, the utility model provides a turbine partition hanger to solve the problem that the existing hanger and the turbine partition are prone to fall off before lifting.

[0034] like Figures 1 to 5 As shown, the steam turbine diaphragm lifting device provided by the utility model comprises a first clamping rod 100, a second clamping rod 200 and a first elastic member 400. The first clamping rod 100 is provided with a first clamping portion 110 and a first hoisting portion 120 at both ends. The second clamping rod 200 forms an X shape with the first clamping rod 100, and the middle part of the second clamping rod 200 is hinged with the middle part of the first clamping rod 100, and the second clamping portion 210 and the second hoisting portion 220 are provided at both ends of the second clamping rod 200. The second hoisting portion 220 is arranged opposite to the first hoisting portion 120 and is used for the lifting belt to pass through, and the second clamping portion 210 is arranged opposite to the first clamping portion 110 and is used to clamp the steam turbine diaphragm together. The first elastic member 400 connects the first clamping rod 100 and the second clamping rod 200, and the first elastic member 400 is used to apply an elastic force to the first clamping rod 100 and the second clamping rod 200 so as to bring the first clamping portion 110 and the second clamping portion 210 closer to each other.

[0035] Through the above technical solution, when it is necessary to hoist the steam turbine diaphragm, the lifting belt of the hoisting equipment can be passed through the first hoisting part 120 and the second hoisting part 220, and then the first clamping part 110 and the second clamping part 210 are clamped on both sides of the steam turbine diaphragm. Since the first elastic member 400 can apply an elastic force to the first clamping rod 100 and the second clamping rod 200 that can make the first clamping part 110 and the second clamping part 210 approach each other, the first clamping part 110 and the second clamping part 210 can maintain the clamping of the steam turbine diaphragm under the action of the first elastic member 400, so that before and during the hoisting, the first clamping part 110 and the second clamping part 210 can always maintain the clamping of the steam turbine diaphragm to prevent the hoist from being separated from the steam turbine diaphragm.

[0036] It is understood that in order to allow the lifting belt to pass through the first lifting part 120 and the second lifting part 220, the first lifting part 120 and the second lifting part 220 have holes for the lifting belt to pass through. The lifting belt passes through the holes on the first lifting part 120 and the holes on the second lifting part 220. During the lifting process, the lifting belt pulls the steam turbine diaphragm lifting device upward, so that the first clamping rod 100 and the second clamping rod 200 can be close to each other, so that the first clamping part 110 and the second clamping part 210 clamp the steam turbine diaphragm. In addition, the first lifting part 120 and the second lifting part 220 can both be lifting rods, which can extend into the lifting groove on the steam turbine diaphragm.

[0037] like Figure 2 and Figure 3 As shown, in some optional embodiments, the steam turbine diaphragm hanger further includes a rotating shaft 300, and the first clamping rod 100 and the second clamping rod 200 are hinged through the rotating shaft 300. The first elastic member 400 is a torsion spring, which is sleeved on the rotating shaft 300, one end of the torsion spring is connected to the first clamping rod 100, and the other end of the torsion spring is connected to the second clamping rod 200. Using a torsion spring as the first elastic member 400 and sleeved on the rotating shaft 300 can make the structure of the hanger more compact and easy to arrange.

[0038] In other embodiments, the first elastic member 400 may also be a spring, which is located between the first clamping rod 100 and the second clamping rod 200 , with one end of the spring connected to the first clamping rod 100 and the other end of the spring connected to the second clamping rod 200 .

[0039] To facilitate the torsion spring to be sleeved on the rotating shaft 300, in some optional embodiments, the rotating shaft 300 is fixed to the first clamping rod 100, the second clamping rod 200 is rotatably sleeved on the rotating shaft 300, and the rotating shaft 300 has a protrusion 310 protruding from the second clamping rod 200 in a direction away from the first clamping rod 100. The steam turbine diaphragm hanger also includes a shaft cap 230, which is fixed on the side of the second clamping rod 200 away from the first clamping rod 100 and sleeved on the outside of the protrusion 310, the torsion spring is sleeved on the protrusion 310, one end of the torsion spring is fixed to the protrusion 310, and the other end of the torsion spring is fixed to the shaft cap 230.

[0040] The rotating shaft 300 is fixed to the first clamping rod 100, and the torsion spring is fixed to the protrusion 310 of the rotating shaft 300, so that the torsion spring can provide elastic force for the rotating shaft 300 and the first clamping rod 100. In addition, the protrusion 310 protrudes from the second clamping rod 200 in a direction away from the first clamping rod 100, so that the protrusion 310 can be located on one side of the second clamping rod 200, which is convenient for installing and fixing the torsion spring. Since the shaft cap 230 is sleeved outside the protrusion 310, the torsion spring is located between the shaft cap 230 and the protrusion 310, so that the shaft cap 230 can protect the torsion spring and increase the service life of the torsion spring.

[0041] like Figures 1 to 5 As shown, in some optional embodiments, the steam turbine diaphragm hanger further includes a rotating shaft 300, the rotating shaft 300 is fixed to the first clamping rod 100, the second clamping rod 200 is rotatably sleeved on the rotating shaft 300, the rotating shaft 300 has a locking portion 320, the locking portion 320 is located on the side of the second clamping rod 200 away from the first clamping rod 100, and the locking portion 320 is provided with a plug hole 321 extending radially along the rotating shaft 300. The steam turbine diaphragm hanger further includes a locking mechanism 500, the locking mechanism 500 is arranged on the side of the second clamping rod 200 away from the first clamping rod 100, the locking mechanism 500 includes a plug-in component 510, the plug-in component 510 is movably installed on the locking mechanism 500 along the radial direction of the rotating shaft 300, and one end of the plug-in component 510 can be inserted into or removed from the plug-in hole 321.

[0042] A locking mechanism 500 is provided on the second clamping rod 200. By inserting the connector 510 in the locking mechanism 500 into the plug-in hole 321 on the locking portion 320 of the rotating shaft 300, the relative rotation between the second clamping rod 200 and the rotating shaft 300 can be limited. The rotor is fixed to the first clamping rod 100, so that the locking mechanism 500 can prevent the first clamping rod 100 and the second clamping rod 200 from accidentally opening under external force and causing separation from the turbine partition.

[0043] It should be noted that the connector 510 is fixed to the second clamping rod 200 when the connector 510 is inserted into the plug hole 321 or when it is removed from the plug hole 321. When the connector 510 is removed from the plug hole 321, the restriction of the second clamping rod 200 and the rotating shaft 300 by the locking mechanism 500 can be released, so that the second clamping rod 200 can rotate relative to the rotating shaft 300, and then the second clamping rod 200 can rotate relative to the first clamping rod 100. The first elastic member 400 and the locking mechanism 500 can be provided on the turbine diaphragm lifting device at the same time to provide better protection against the risk of the turbine diaphragm being separated from the lifting device during the lifting process.

[0044] In some optional embodiments, the locking mechanism 500 further includes a second elastic member 520, which is used to apply an elastic force to the plug connector 510 to move it toward the plug hole 321. By providing the second elastic member 520 to provide the plug connector 510 with an elastic force to move toward the plug hole 321, after the plug connector 510 is inserted into the plug hole 321, the second elastic member 520 can keep the plug connector 510 in the plug hole 321, and it is not easy to accidentally fall out of the plug hole 321.

[0045] In some optional embodiments, the locking mechanism 500 also includes a guide sleeve 530 and a guide member 540, the guide sleeve 530 extends radially along the rotating shaft 300 and is fixed to the second clamping rod 200, the guide member 540 is movably disposed in the guide sleeve 530, the connector 510 is connected to the guide member 540, one end of the second elastic member 520 is connected to the guide sleeve 530, and the other end of the second elastic member 520 is connected to the connector 510.

[0046] The guide sleeve 530 and the guide member 540 are provided to enable the guide member 540 to slide linearly in the guide sleeve 530, and the connector 510 is fixedly connected to the guide member 540 to enable the guide member 540 to move linearly, thereby facilitating the connector 510 to be inserted into or removed from the connector slot.

[0047] In some optional embodiments, a guide rod 511 is provided on the connector 510, the second elastic member 520 is sleeved on the guide rod 511, a baffle 531 is provided on the guide sleeve 530, a through hole is opened on the baffle 531, the guide rod 511 is movably inserted into the through hole, and one end of the second elastic member 520 is connected to the baffle 531.

[0048] By setting the guide rod 511 and the baffle 531, a mounting base can be provided for the second elastic member 520, and the deformation direction of the second elastic member 520 can be limited, so that the elastic force provided by the second elastic member 520 can act more on the connector 510, further preventing the connector 510 from falling out of the connector hole 321 after being inserted into the connector hole 321.

[0049] In some optional embodiments, the connector 510 includes a first section 512 and a second section 513 connected to each other, wherein the first section 512 extends radially along the shaft 300 and is used to be inserted into the connector hole 321 , and the second section 513 extends axially along the shaft 300 and is connected to the guide member 540 .

[0050] Dividing the connector 510 into a first section 512 and a second section 513 allows the first section 512 and the second section 513 to be arranged in a straight line or at an angle, thereby allowing the position of the first section 512 of the connector 510 to be adjusted as needed.

[0051] Optionally, the first section 512 is parallel to the guide rod 511 , so that the plugging direction of the first section 512 is consistent with the axial direction of the guide rod 511 , and the second elastic member 520 provides better elastic force for the first section 512 .

[0052] In some optional embodiments, an operating portion 541 is provided at one end of the guide member 540 away from the connector 510, and the operating portion 541 is used to operate the guide member 540 to move, so that the guide member 540 drives the connector 510 to move. The operator can control the movement of the guide member 540 by holding the operating portion 541, thereby driving the connector 510 to move.

[0053] In some optional embodiments, there are multiple plug-in holes 321 , and the multiple plug-in holes 321 are arranged at intervals along the circumference of the rotating shaft 300 , and the connector 510 can be inserted into any plug-in hole 321 .

[0054] A plurality of plug holes 321 are provided. When the plug connector 510 is inserted into different plug holes 321, the first clamping rod 100 and the second clamping rod 200 can be locked at different angles, so as to adapt to turbine diaphragms of different sizes.

[0055] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the present invention.

[0056] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0057] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A steam turbine diaphragm hanger, characterized in that: include: A first clamping rod, wherein two ends of the first clamping rod are respectively provided with a first clamping portion and a first hoisting portion; a second clamping rod, wherein the second clamping rod and the first clamping rod form an X shape, and the middle portion of the second clamping rod is hinged to the middle portion of the first clamping rod, and the second clamping portion and the second hoisting portion are respectively provided at both ends of the second clamping rod, the second hoisting portion is arranged opposite to the first hoisting portion and is used for the lifting belt to pass through, and the second clamping portion is arranged opposite to the first clamping portion and is used to jointly clamp the turbine diaphragm; The first elastic member connects the first clamping rod and the second clamping rod, and the first elastic member is used to apply an elastic force to the first clamping rod and the second clamping rod so as to bring the first clamping portion and the second clamping portion closer to each other.

2. The steam turbine diaphragm hanger according to claim 1, characterized in that: The steam turbine diaphragm hanger further comprises a rotating shaft, and the first clamping rod and the second clamping rod are hingedly connected via the rotating shaft; The first elastic member is a torsion spring, which is sleeved on the rotating shaft, one end of the torsion spring is connected to the first clamping rod, and the other end of the torsion spring is connected to the second clamping rod.

3. The steam turbine diaphragm hanger according to claim 2, characterized in that: The rotating shaft is fixed to the first clamping rod, the second clamping rod is rotatably sleeved on the rotating shaft, and the rotating shaft has a protrusion protruding from the second clamping rod in a direction away from the first clamping rod; The turbine partition hanger also includes a shaft cap, which is fixed on the side of the second clamping rod away from the first clamping rod and is sleeved on the outside of the protrusion. The torsion spring is sleeved on the protrusion, one end of the torsion spring is fixed to the protrusion, and the other end of the torsion spring is fixed to the shaft cap.

4. The steam turbine diaphragm hanger according to claim 1, characterized in that: The steam turbine diaphragm hanger further comprises a rotating shaft, the rotating shaft is fixed to the first clamping rod, the second clamping rod is rotatably sleeved on the rotating shaft, the rotating shaft has a locking portion, the locking portion is located at a side of the second clamping rod away from the first clamping rod, and the locking portion is provided with a plug-in hole extending radially along the rotating shaft; The steam turbine partition hanger also includes a locking mechanism, which is arranged on the side of the second clamping rod away from the first clamping rod. The locking mechanism includes a connector, which is movably installed on the locking mechanism along the radial direction of the rotating shaft, and one end of the connector can be inserted into or removed from the connector hole.

5. The steam turbine diaphragm hanger according to claim 4, characterized in that: The locking mechanism further comprises a second elastic member, and the second elastic member is used to apply an elastic force to the plug-in component to move the plug-in component toward the plug-in hole.

6. The steam turbine diaphragm hanger according to claim 5, characterized in that: The locking mechanism also includes a guide sleeve and a guide member, wherein the guide sleeve extends radially along the rotating shaft and is fixed to the second clamping rod, the guide member is movably arranged in the guide sleeve, the connector is connected to the guide member, one end of the second elastic member is connected to the guide sleeve, and the other end of the second elastic member is connected to the connector.

7. The steam turbine diaphragm hanger according to claim 6, characterized in that: The connector is provided with a guide rod, the second elastic member is sleeved on the guide rod, the guide sleeve is provided with a baffle, a through hole is opened on the baffle, the guide rod is movably inserted into the through hole, and one end of the second elastic member is connected to the baffle.

8. The steam turbine diaphragm hanger according to claim 6, characterized in that: The plug-in connector includes a first section and a second section connected to each other, wherein the first section extends along the radial direction of the rotating shaft and is used to be inserted into the plug-in hole, and the second section extends along the axial direction of the rotating shaft and is connected to the guide member.

9. The steam turbine diaphragm hanger according to claim 6, characterized in that: An operating portion is provided at one end of the guide member away from the connector, and the operating portion is used to operate the guide member to move so that the guide member drives the connector to move.

10. The steam turbine diaphragm hanger according to any one of claims 4 to 9, characterized in that: There are a plurality of the plugging holes, which are arranged at intervals along the circumference of the rotating shaft, and the connector can be inserted into any of the plugging holes.

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