A polishing chucking device

Abstract

The application relates to the polishing technical field and provides a polishing clamping device which comprises a mounting seat, the mounting seat being rotationally arranged; a lower clamping block, the lower clamping block being arranged on the mounting seat; a rotating part, the rotating part being rotationally arranged on the mounting seat; an upper clamping block, the upper clamping block being rotationally arranged on the rotating part, insulators being clamped between the upper clamping block and the lower clamping block, the rotating axes of the upper clamping block, the mounting seat and the rotating part being parallel to each other; a guide part, the guide part being arranged on one side of the mounting seat at intervals, the guide part being located on the rotating surface and the rotating path of the rotating part, when the rotating part rotates to abut against the guide part, the guide part drives the rotating part to rotate and makes the lower clamping block gradually close to the lower clamping block; and a driving piece, the driving piece being used for driving the mounting seat to rotate and adjust. Based on the polishing clamping device, the clamping stability and reliability of the insulators can be improved during polishing.

Description

TECHNICAL FIELD

[0001] The present application relates to the polishing technical field, in particular to a polishing clamping device. BACKGROUND

[0002] The insulator is a kind of insulation control, usually made of glass or ceramic, can be used to increase the creepage distance, realize electrical insulation and mechanical fixation.And in the production process of insulator, a long insulator material needs to be cut into several sections, but the end face of the cut insulator is rough, so polishing device is needed to polish the two ends of the insulator to ensure the surface smoothness of the insulator.

[0003] For the related technology in the above, when polishing, the insulator needs to be clamped and fixed by the clamping assembly on the polishing device first, so that the insulator remains stable.However, the outer surface of the existing columnar insulator generally has a plurality of umbrella skirts, the umbrella skirts are annular sheet-shaped and arranged at intervals on the outer side of the insulator;Due to the existence of umbrella skirt, and the insulator will be subjected to asymmetric external force during polishing, the clamping position of the umbrella skirt is unstable, and the clamping stability is poor. SUMMARY

[0004] In order to improve the clamping stability and reliability of the insulator during polishing, the present application provides a polishing clamping device.

[0005] The polishing clamping device provided by the present application adopts the following technical scheme:

[0006] A polishing clamping device, comprising, a mounting seat, the mounting seat is rotationally arranged;A lower clamping block, the lower clamping block is arranged on the mounting seat;A rotating part, the rotating part is rotationally arranged on the mounting seat;An upper clamping block, the upper clamping block is rotationally arranged on the rotating part, the insulator is clamped between the upper clamping block and the lower clamping block, the rotating axes of the upper clamping block, the mounting seat and the rotating part are parallel to each other;A guide part, the guide part is arranged at intervals on one side of the mounting seat, the guide part is located on the rotating surface and rotating path of the rotating part, when the rotating part rotates to abut against the guide part, the guide part drives the rotating part to rotate itself and makes the lower clamping block gradually close to the lower clamping block;A driving member, the driving member is used to drive the mounting seat to rotate and adjust.

[0007] By adopting the technical scheme, the insulator is placed on the lower clamp block, then the mounting seat is driven to rotate by the driving member, when the rotating part contacts the guiding part, the relative rotation between the rotating part and the mounting seat occurs under the limitation of the guiding part, the upper clamp block and the lower clamp block are close to each other and gradually clamp the insulator, the rotating upper clamp block can be better pressed on the outside of the insulator, thereby realizing the mechanical clamping of the insulator, and unlike the traditional cylinder clamping, the clamping stability and reliability of the insulator during polishing are improved.

[0008] Preferably, the upper clamp block and the lower clamp block are located at the outer circumferential side of the mounting seat, the lower clamp block is provided with a first clamping opening with an opening upward, and the side of the upper clamp block facing the lower clamp block is provided with a second clamping opening, the first clamping opening and the second clamping opening are oppositely arranged, and the insulator is clamped between the first clamping opening and the second clamping opening.

[0009] By adopting the technical scheme, the insulator can be preliminarily positioned by the first clamping opening, so that the insulator can be stably placed on the lower clamp block, and the outside of the insulator can be better covered by the upper clamp block and the lower clamp block through the second clamping opening, thereby improving the clamping stability of the insulator.

[0010] Preferably, one side of the rotating part facing the guiding part is rotatably provided with an abutting block, the rotating axis of the abutting block is parallel to the rotating axis of the rotating part, a first elastic member is arranged between the opposite side of the abutting block and the rotating part, one end of the first elastic member is connected with the rotating part, the other end of the first elastic member is connected with the abutting block, and the guiding part is located on the path of the abutting block rotating with the mounting seat; when the abutting block contacts the guiding part, the first elastic member is extruded.

[0011] By adopting the technical scheme, the rotating part indirectly contacts the guiding part through the abutting block, and when the abutting block abuts against the guiding part, the first elastic member is extruded, so that the upper clamp block can better elastically abut against the insulator.

[0012] Preferably, one end of the abutting block is rotatably provided with a guide wheel, the rotating axis of the guide wheel is parallel to the rotating axis of the abutting block, and when the abutting block abuts against the guiding part, the guide wheel rotates against the guiding part.

[0013] By adopting the technical scheme, when the abutting block slides against the guiding part, the guide wheel can rotate along the guiding part, avoiding the direct sliding friction between the abutting block and the guiding part, and reducing the wear between the abutting block and the guiding part.

[0014] Preferably, two abutting blocks are spaced apart along the length direction of the insulator, and two guiding parts are also spaced apart along the length direction of the insulator.

[0015] By adopting the above technical scheme, the two abutting blocks and the two guide portions arranged at intervals can generate two-point pressure on the rotating portion, so that the rotating portion exerts more stable pressure on the upper clamping block, thereby improving the clamping stability of the insulator.

[0016] Preferably, a connecting portion is arranged on the mounting base near the rotating axis of the rotating portion, a second elastic member is arranged on the connecting portion, one end of the second elastic member is fixed to the connecting portion, and the other end of the second elastic member is fixed to the rotating portion.

[0017] By adopting the above technical scheme, through cooperation between the connecting portion and the second elastic member, the second elastic member can pull the freely rotating rotating portion, so that the upper clamping block and the lower clamping block maintain a certain distance, facilitating the taking and placing of the insulator between the upper clamping block and the lower clamping block.

[0018] Preferably, a supporting plate is independently arranged on the side of the first clamping opening away from the mounting base, and the supporting plate is spaced apart from the mounting base and the lower clamping block.

[0019] By adopting the above technical scheme, when the insulator is placed on the lower clamping block for clamping by artificial operation, the insulator may slip or fall due to its columnar shape, but the supporting plate can catch the falling insulator, thereby reducing the impact of the insulator falling directly to the ground.

[0020] Preferably, a positioning portion is arranged on one side of the lower clamping block, and the positioning portion is adjustably arranged along the length direction of the insulator.

[0021] By adopting the above technical scheme, by arranging the positioning portion, when the insulator is placed on the lower clamping block, one end of the insulator can be attached to the positioning portion, thereby improving the clamping position accuracy of the insulator; at the same time, by adjusting the position of the positioning portion, the positioning of insulators of different lengths can be achieved.

[0022] Preferably, a housing is further included, the housing covers the mounting base, an opening is arranged on one side of the housing, and the upper clamping block and the lower clamping block are arranged near the opening.

[0023] By adopting the above technical scheme, by arranging the housing, the dust generated during polishing can be better covered, thereby reducing the influence of the dust on the surrounding environment; and the upper clamping block and the lower clamping block are arranged near the opening, thereby facilitating the clamping and taking and placing operation of the insulator, and when the mounting base is gradually rotated, the insulator is moved into the housing.

[0024] Preferably, the guide part is a circular arc guide rail on the rotating surface of the mounting seat, the circular arc guide rail is arranged outside the path of the rotating part rotating with the mounting seat, and one side of the guide part is provided with a notch; when the rotating part abuts against the guide part, the insulator is in a clamped state, and when the rotating part is located at the notch position, the insulator is in a released state.

[0025] By adopting the technical scheme, when the mounting seat rotates, the rotating part rotates with the mounting seat and is continuously limited by the circular arc guide rail, so that the upper clamping block on the rotating part can always clamp the insulator together with the lower clamping block; when the rotating part moves to the notch, the rotating part no longer contacts the circular arc guide rail, at this time, the rotating part and the mounting seat are relatively free to rotate, and the insulator is in a released state.

[0026] In summary, the present application has at least one of the following beneficial technical effects:

[0027] (1) By setting the cooperation between the mounting seat, the lower clamping block, the rotating part, the upper clamping block and the driving part, the insulator can be mechanically clamped, thereby improving the clamping stability and reliability of the insulator during polishing;

[0028] (2) By setting the cooperation between the abutting block and the first elastic member, when the upper clamping block and the lower clamping block clamp the insulator, the first elastic member is extruded, so that the upper clamping block and the lower clamping block can elastically abut against the insulator to better clamp the insulator. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a structure schematic view of the polishing and clamping device in the initial state of the embodiment;

[0030] Figure 2 is a partial structure schematic view of the polishing and clamping device of the embodiment;

[0031] Figure 3 is a side view of the polishing and clamping device when clamping a product of the embodiment;

[0032] Figure 4 is a structure schematic view of the polishing and clamping device with a shell of the embodiment.

[0033] The drawings show that: 1, frame body; 2, mounting seat; 3, rotating part; 4, driving part; 5, guide part; 6, lower clamping block; 7, upper clamping block; 8, first clamping opening; 9, second clamping opening; 10, shell; 11, notch; 12, inclined guide rail; 13, abutting block; 14, hinged seat; 15, first elastic member; 16, guide wheel; 17, connecting part; 18, second elastic member; 19, supporting plate; 20, positioning part; 21, mounting block; 22, sliding block; 23, strip-shaped hole. DETAILED DESCRIPTION

[0034] The application will be further described below in conjunction with the accompanying drawings. Figures 1-4 The application will be further described below in conjunction with the accompanying drawings.

[0035] The application discloses a clamping device for polishing. Referring to Figure 1 and Figure 2 , the clamping device is mainly used for clamping and positioning columnar products, and in the embodiment, the columnar insulator product is taken as an example, and the position of the clamping device when the insulator is to be fixed is taken as the initial position and is described in detail. The clamping device comprises a frame body 1, a mounting seat 2, a rotating part 3, a driving part 4, a guide part 5, a lower clamping block 6 and an upper clamping block 7. The mounting seat 2 is in the form of a plate and is vertically arranged, the mounting seat 2 is rotationally connected to the frame body 1, and the rotating axis of the mounting seat 2 is horizontally arranged and vertically penetrates the mounting seat 2. The driving part 4 is a servo motor mounted on the frame body 1, the servo motor is in transmission connection with the rotating shaft of the mounting seat 2, and is used for driving the mounting seat 2 to rotate in the circumferential direction for adjustment.

[0036] The lower clamping block 6 is fixed to the position on the outer circumferential side of the mounting seat 2, and the upper end of the lower clamping block 6 is provided with a V-shaped groove with an opening facing upward, and the V-shaped groove forms a first clamping opening 8 with an opening facing upward. The rotating part 3 is in the form of a rectangular block and is rotationally connected to the outer circumferential side of the mounting seat 2 at one end, and the rotating part 3 is located on the rotating surface of the mounting seat 2. The upper clamping block 7 is rotationally arranged at the other end of the rotating part 3, the rotating axes of the mounting seat 2, the upper clamping block 7 and the rotating part 3 are parallel to each other and are parallel to the length direction of the insulator. A second clamping opening 9 is formed in the side of the upper clamping block 7 facing the lower clamping block 6, the second clamping opening 9 is also in the form of a V-shaped groove, and the first clamping opening 8 and the second clamping opening 9 are oppositely arranged. When the insulator is clamped, the insulator is first placed in the first clamping opening 8, the lower clamping block 6 can preliminarily position the insulator, and the insulator is clamped between the first clamping opening 8 and the second clamping opening 9.

[0037] Referring to Figure 2 and Figure 3 , the guide part 5 is fixed to the frame body 1 and is arranged at intervals on the outer side of the mounting seat 2, the guide part 5 is located on the rotating surface and the rotating path of the rotating part 3, and the guide part 5 is located on the outer side of the path of the rotating part 3 when the mounting seat 2 rotates. When the rotating part 3 rotates with the mounting seat 2, and the end of the rotating part 3 close to the upper clamping block 7 abuts against the guide part 5 on the side facing the mounting seat 2, the guide part 5 drives the rotating part 3 to rotate and drives the upper clamping block 7 to rotate towards the lower clamping block 6, and then drives the upper clamping block 7 and the lower clamping block 6 to gradually approach and clamp the insulator, so as to realize the mechanical clamping of the insulator, which is different from the traditional air cylinder clamping, and improves the clamping stability and reliability of the insulator.

[0038] Further, the guide part 5 is a circular arc guide rail, which is located in the rotating surface of the mounting base 2 and surrounds the path of the rotating part 3 when the mounting base 2 rotates. The horizontal side of the circular arc guide rail is provided with a gap 11. A downward extending inclined guide rail 12 is fixed to the upper side of the gap 11. The inclined guide rail 12 is also located outside the path of the rotating part 3 when the mounting base 2 rotates.

[0039] When the rotating part 3 rotates with the mounting base 2 to abut against the guide part 5, the rotating part 3 first gently transitions to abut against the side of the inclined guide rail 12 facing the mounting base 2. At this time, the upper clamp block 7 begins to gradually approach the lower clamp block 6, so that the insulator is not easily separated from the upper clamp block 7 and the lower clamp block 6. Then, until the rotating part 3 transitions from the inclined guide rail 12 to the circular arc guide rail, the insulator remains in the clamped state. When the rotating part 3 is located at the gap 11, one end of the rotating part 3 is not in contact with the circular arc guide rail and the inclined guide rail 12. At this time, the insulator is in a released state, which is convenient for taking and placing the insulator.

[0040] According to some embodiments of the present application, optionally, one side of the rotating part 3 facing the guide part 5 is provided with an abutting block 13 which is rotatable through a hinged seat 14. The abutting block 13 is also in the shape of a rectangular strip. The length of the abutting block 13 is less than the length of the rotating part 3. The hinged seat 14 is located at the middle position of the rotating part 3 and the abutting block 13. The rotating axis of the abutting block 13 is parallel to the rotating axis of the rotating part 3. A first elastic member 15 is fixed between the opposite side of the abutting block 13 and the rotating part 3. The first elastic member 15 is a spring or an elastic column. In this embodiment, the first elastic member 15 is taken as an example. The first elastic member 15 is located at the side of the hinged seat 14 away from the mounting base 2. One end of the first elastic member 15 is connected with the rotating part 3, and the other end of the first elastic member 15 is connected with the abutting block 13. The guide part 5 is located on the path of the abutting block 13 when the mounting base 2 rotates. Although the abutting block 13 has its own gravity, when it is not in contact with the circular arc guide rail and the inclined guide rail 12 and under the action of the first elastic member 15, the abutting block 13 and the rotating part 3 are relatively stationary.

[0041] The distance from the lower clamp block 6 to the rotating axis of the mounting base 2 is less than the distance from the circular arc guide rail and the inclined guide rail to the rotating axis of the mounting base 2, so as to ensure that the components other than the abutting block 13 will not be interfered by the guide part 5. When the abutting block 13 abuts against the circular arc guide rail and the inclined guide rail 12, the first elastic member 15 begins to be compressed, and at the same time, it exerts pressure on the rotating part 3, so that the upper clamp block 7 and the lower clamp block 6 gradually approach each other, so as to achieve the elastic clamping of the insulator by the upper clamp block 7 and the lower clamp block 6.

[0042] According to some embodiments of the present application, the abutting block 13 is rotatably arranged at one end of the mounting base 2 away from the mounting base 2, and a guide wheel 16 is arranged at the abutting block 13, the rotation axis of the guide wheel 16 is parallel to the rotation axis of the abutting block 13, when the abutting block 13 abuts against the circular arc guide rail or the inclined guide rail 12, the guide wheel 16 rotates along the circular arc guide rail or the inclined guide rail 12, thereby reducing the friction between the abutting block 13 and the circular arc guide rail or the inclined guide rail 12.

[0043] According to some embodiments of the present application, the abutting block 13 is arranged at two positions along the length direction of the insulator, and the guide portion 5 is also arranged at two positions along the length direction of the insulator, and in other embodiments, the number of the abutting block 13 and the guide portion 5 can be more than two; therefore, the abutting block 13 can generate more than two point pressures on the rotating portion 3, so that the rotating portion 3 applies more stable pressure on the upper clamping block 7, thereby improving the clamping stability of the insulator.

[0044] According to some embodiments of the present application, a connecting portion 17 is fixed at the outer periphery of the mounting base 2 and close to the rotation axis of the rotating portion 3, the connecting portion 17 is in a columnar shape, a second elastic member 18 is arranged on the connecting portion 17, the second elastic member 18 is also a spring or an elastic column, and in the present embodiment, the second elastic member 18 is taken as an example; one end of the second elastic member 18 is fixedly connected with the end of the connecting portion 17 away from the mounting base 2, and the other end of the second elastic member 18 is fixedly connected with the rotating portion 3. The second elastic member 18 can pull the freely rotating rotating portion 3, so that the upper clamping block 7 and the lower clamping block 6 maintain a certain distance, thereby facilitating the taking and placing of the insulator between the upper clamping block 7 and the lower clamping block 6; and when the upper clamping block 7 abuts against the guide portion 5, the second elastic member 18 is stretched.

[0045] According to some embodiments of the present application, a supporting plate 19 is fixed on the mounting base 2 at a position away from the mounting base 2 and close to the first clamping opening 8, the supporting plate 19 has a spacing between the outer periphery of the mounting base 2 and the lower clamping block 6, the supporting plate 19 extends away from the mounting base 2, the spacing between the supporting plate 19 and the lower clamping block 6 is smaller than the outer diameter of the insulator, and the supporting plate 19 is close to the lower side of the notch 11 of the circular arc guide rail; when the insulator is taken or placed on the lower clamping block 6, if it is accidentally dropped, the supporting plate 19 can support the dropped insulator, thereby reducing the possibility of the insulator directly falling to the ground.

[0046] According to some embodiments of the present application, a positioning portion 20 is fixed on the frame body 1, the positioning portion 20 is in a block shape, the positioning portion 20 is arranged at one side of the lower clamping block 6, the positioning portion 20 is adjustably arranged along the length direction of the insulator, and the positioning portion 20 is located at one side of the length direction of the insulator; when the insulator is placed on the lower clamping block 6, one end of the insulator abuts against the positioning portion 20, thereby positioning the placement position of the insulator, improving the clamping accuracy of the insulator; and by adjusting the position of the mounting portion, the positioning of insulators with different lengths can be achieved.

[0047] Specifically, the mounting block 21 is fixed on the frame body 1, a sliding groove is formed on the mounting block 21, the slide block 22 is fixed on the side of the positioning part 20 away from the lower clamping block 6, the slide block 22 is slidably connected to the sliding groove, and opposite strip-shaped holes 23 are formed on the mounting block 21 and the slide block 22. The slide block 22 is locked to the strip-shaped holes 23 through a bolt and nut assembly, and the bolt passes through the two strip-shaped holes 23 at the same time, so as to adjust the position of the positioning part 20.

[0048] According to some embodiments of the present application, referring to Figure 4 Optionally, the mounting seat 2 and the frame body 1 are covered with a rectangular shell 10, one side of the shell 10 is provided with an opening, and the upper clamping block 7 and the lower clamping block 6 are located close to the opening; specifically, the upper clamping block 7 and the lower clamping block 6 are located outside the opening, and when the mounting seat 2 rotates, the upper clamping block 7 and the lower clamping block 6 drive the insulator to enter the shell 10 for polishing, which can reduce the dust overflow generated during polishing.

[0049] The implementation principle of the polishing and clamping device in the embodiment of the present application is as follows: when clamping, first, the insulator is placed in the first clamping opening 8 of the lower clamping block 6 to achieve preliminary positioning of the insulator; the second elastic member 18 can pull the rotating part 3, so that the upper clamping block 7 and the lower clamping block 6 maintain a certain distance, then the driving member 4 drives the mounting seat 2 to rotate, at this time, the rotating part 3, the abutting block 13 and the upper clamping block 7 all rotate with the mounting seat 2; when one end of the abutting block 13 contacts the inclined guide rail 12, the abutting block 13 is extruded to generate pressure on the rotating part 3, so that the rotating part 3 and the mounting seat 2 rotate relatively, and the upper clamping block 7 and the lower clamping block 6 begin to approach, and the first elastic member 15 is compressed to gradually press the insulator; and when the abutting block 13 transitions from the inclined guide rail 12 to the abutting arc guide rail, the insulator remains in the clamped state, at this time, the insulator can be polished; when the abutting block 13 moves to the gap 11 of the arc guide rail and does not contact the guide part 5, the upper clamping block 7 and the lower clamping block 6 are opened, and the insulator can be removed; the mechanical clamping of the insulator is achieved, which is different from the traditional cylinder clamping, and the clamping stability and reliability of the insulator are improved.

[0050] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A grinding clamping device, characterized in that, include, Mounting base (2), which is rotatably mounted; Lower clamping block (6), the lower clamping block (6) is disposed on the mounting base (2); Rotating part (3), the rotating part (3) is rotatably disposed on the mounting base (2); The upper clamping block (7) is rotatably disposed on the rotating part (3), and the insulator is clamped between the upper clamping block (7) and the lower clamping block (6). The rotation axes of the upper clamping block (7), the mounting base (2) and the rotating part (3) are parallel to each other. The guide (5) is spaced apart on one side of the mounting base (2). The guide (5) is located on the rotating surface and rotating path of the rotating part (3). When the rotating part (3) rotates to abut against the guide (5), the guide (5) drives the rotating part (3) to rotate itself and makes the upper clamping block (7) gradually approach the lower clamping block (6). A driving component (4) is used to drive the mounting base (2) to rotate and adjust. The upper clamping block (7) and the lower clamping block (6) are located on the outer periphery of the mounting base (2). The lower clamping block (6) is provided with a first clamping opening (8) facing upwards. The upper clamping block (7) is provided with a second clamping opening (9) on the side facing the lower clamping block (6). The first clamping opening (8) and the second clamping opening (9) are arranged opposite to each other. The insulator is clamped between the first clamping opening (8) and the second clamping opening (9). The rotating part (3) is rotatably provided with an abutment block (13) on the side facing the guide part (5). The rotation axis of the abutment block (13) is parallel to the rotation axis of the rotating part (3). A first elastic member (15) is provided between the abutment block (13) and the opposite side of the rotating part (3). One end of the first elastic member (15) is connected to the rotating part (3), and the other end of the first elastic member (15) is connected to the abutment block (13). The guide part (5) is located on the path of the abutment block (13) rotating with the mounting base (2). When the abutment block (13) contacts the guide part (5), the first elastic member (15) is squeezed.

2. The grinding clamping device according to claim 1, characterized in that, One end of the abutment block (13) is rotatably provided with a guide wheel (16). The rotation axis of the guide wheel (16) is parallel to the rotation axis of the abutment block (13). When the abutment block (13) abuts against the guide part (5), the guide wheel (16) rotates along the guide part (5).

3. The grinding clamping device according to claim 2, characterized in that, Two abutting blocks (13) are spaced apart along the length of the insulator, and two guide parts (5) are also spaced apart along the length of the insulator.

4. The grinding clamping device according to claim 1, characterized in that, A connecting part (17) is provided on the mounting base (2) near the rotation axis of the rotating part (3). A second elastic element (18) is provided on the connecting part (17). One end of the second elastic element (18) is fixed to the connecting part (17), and the other end of the second elastic element (18) is fixed to the rotating part (3).

5. A grinding clamping device according to claim 1, characterized in that, It also includes a tray (19) independently disposed on the side of the first clamp (8) away from the mounting base (2), and the tray (19) is spaced apart from the mounting base (2) and the lower clamp (6).

6. A grinding clamping device according to claim 1, characterized in that, The lower clamping block (6) is provided with a positioning part (20) at intervals on one side, and the positioning part (20) is adjustable along the length direction of the insulator.

7. A grinding clamping device according to claim 1, characterized in that, It also includes a housing (10) that covers the mounting base (2), and an opening is provided on one side of the housing (10), with the upper clamping block (7) and the lower clamping block (6) located near the opening.

8. A grinding clamping device according to claim 1, characterized in that, The guide part (5) is an arc guide rail located on the rotating surface of the mounting base (2). The arc guide rail is arranged around the outside of the path of the rotating part (3) as the mounting base (2) rotates. A notch (11) is provided on one side of the guide part (5). When the rotating part (3) abuts against the guide part (5), the insulator is in a clamped state. When the rotating part (3) is located at the notch (11), the insulator is in a loose state.

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