Rotary clamping device and electrode lengthening equipment

Abstract

The utility model relates to the technical field of electrode extension, in particular to a rotary clamping device and electrode extension equipment. The rotary clamping device comprises a mounting cylinder, a rotating cylinder, a positioning cylinder, a driving device and a plurality of clamping blocks, the rotating cylinder coaxially sleeves the outer side of the mounting cylinder, the rotating cylinder and the mounting cylinder can relatively and circumferentially rotate, and all the clamping blocks are circumferentially mounted on the cylinder wall of the mounting cylinder at intervals; the rotating cylinder and the positioning cylinder are coaxially sleeved, and the driving device can drive the rotating cylinder to rotationally ascend or descend in the axial direction of the positioning cylinder; wherein the rotating cylinder which rotates and descends can drive the clamping blocks to move inwards from the cylinder wall of the mounting cylinder in the radial direction, so that all the clamping blocks clamp the new electrode and drive the new electrode to rotate and descend; and the rotating cylinder which rotates and ascends can drive the clamping blocks to move outwards in the radial direction from the cylinder wall of the mounting cylinder, so that all the clamping blocks are separated from the new electrode and rotate and ascend along with the rotating cylinder. According to the rotary clamping device, electrode butt joint can be achieved only through the rotary clamping device, the structure is simpler, and cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of electrode extension, in particular to a rotary clamping device and electrode extension equipment. Background Art

[0002] Cylindrical electrodes made of graphite are needed in the smelting process. However, the electrodes will be consumed continuously during the smelting process, so after the old electrode is consumed, a new electrode needs to be connected to the top of the old electrode (this process is also called electrode extension).

[0003] The bottom end of the electrode is provided with an external thread, and the top end thereof is provided with an internal thread. In the process of installing the new electrode on the old electrode, it is necessary to drive the new electrode downward while rotating the new electrode so that the bottom end of the new electrode is screwed into the top end of the old electrode, thereby making the two threadedly connected.

[0004] At present, the connection between the new and old electrodes is completed by a rotary clamping device. The traditional rotary clamping device includes multiple independent action mechanisms, such as a clamping cylinder mechanism responsible for clamping the new electrode, a driving mechanism responsible for driving the new electrode to rotate, and a lifting mechanism responsible for lifting the new electrode. In addition, the clamping cylinder mechanism also requires a supporting hydraulic system. Therefore, the composition of the traditional rotary clamping device is too complicated and the equipment cost is high. Utility Model Content

[0005] The utility model aims to overcome the problems of complex composition and high equipment cost of the traditional rotary clamping device in the prior art.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a rotating clamping device on the one hand, which includes a mounting tube, a rotating tube, a positioning tube, a driving device and a plurality of clamping blocks; the rotating tube is coaxially sleeved on the outer side of the mounting tube, and the rotating tube and the mounting tube can rotate circumferentially relative to each other, and all the clamping blocks are circumferentially installed on the tube wall of the mounting tube; the rotating tube and the positioning tube are coaxially sleeved, and the driving device can drive the rotating tube to rotate up or down along the axial direction of the positioning tube; wherein the rotating tube that rotates down can drive the clamping blocks to move radially inward from the tube wall of the mounting tube, so that all the clamping blocks clamp the new electrode inserted into the mounting tube and drive the new electrode to rotate down; the rotating tube that rotates up can drive the clamping blocks to move radially outward from the tube wall of the mounting tube, so that all the clamping blocks are detached from the new electrode inserted into the mounting tube and rotate up with the rotating tube.

[0007] In some embodiments, the rotating cylinder can be rotated and positioned relative to the positioning cylinder.

[0008] In some embodiments, the thread pitch of the positioning cylinder is in the range of 6 mm to 9 mm, and the thread pitch of the positioning cylinder is the same as the thread pitch of the electrode.

[0009] In some embodiments, the thread pitch range of the positioning cylinder and the thread pitch range of the rotating cylinder are 6 mm-9 mm.

[0010] In some embodiments, an annular support platform and an annular limit platform are provided on the inner side of the rotating cylinder, the limit platform is located above the support platform, and the bottom surface of the mounting cylinder is in contact with the support platform; a limit ring is provided on the outer ring of the top of the mounting cylinder, and the bottom surface of the limit ring is in contact with the top surface of the limit platform.

[0011] In some embodiments, the top surface of the rotating cylinder is flush with the top surface of the limiting ring, and an annular cover plate is fixedly mounted on the top surface of the rotating cylinder.

[0012] In some embodiments, the driving device is a driving motor, the outer ring of the rotating cylinder is provided with a transmission gear ring, the output shaft of the driving motor is provided with a driving gear, and the driving gear is meshed with the transmission gear ring.

[0013] In some embodiments, a plurality of mounting holes extending through the wall of the mounting cylinder are provided, and all clamps are rotatably installed in the mounting holes one by one; the clamps include a driving portion, a connecting portion and a clamping portion, the connecting portion is located in the mounting hole, and the connecting portion is connected to the mounting cylinder by a pin shaft; the driving portion is connected to the side of the connecting portion facing the rotating cylinder, and the clamping portion is connected to the connecting portion; a plurality of slots are provided on the side of the rotating cylinder facing the mounting cylinder, and all the driving portions extend into the slots one by one.

[0014] In some embodiments, the outer surface of the clamping portion has a plurality of teeth.

[0015] On the other hand, the utility model further provides an electrode extension device, which comprises the rotary clamping device of any one of the above embodiments.

[0016] The above technical solution has the following beneficial effects:

[0017] The driving device can drive the rotating cylinder to rotate and descend, and the rotating cylinder that rotates and descends can drive the clamping block to clamp the new electrode, and then the rotating cylinder drives the clamped new electrode to rotate and descend through the clamping block on the mounting cylinder for rotational docking. The driving device can drive the rotating cylinder to rotate and ascend, and the rotating cylinder that rotates and ascends can drive the clamping block to detach from the new electrode, and then the rotating cylinder drives the mounting cylinder to return to the initial position. Compared with the traditional rotating clamping device, the composition and structure of the rotating clamping device of the utility model are simpler, and the equipment cost is lower;

[0018] In addition, after the clamping block clamps the new electrode, the driving device can drive the rotating cylinder to continue rotating and descending and docking with the old electrode. During the docking process between the new electrode and the old electrode, the rotating cylinder and the clamping block can support and position the new electrode to prevent the weight of the new electrode from completely pressing against the old electrode, preventing the threads of the old and new electrodes from being damaged, and the two electrodes are more smooth when connected by thread, which can not only reduce the loss of replacing the electrode, but also improve the efficiency of electrode replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional schematic diagram of a rotary clamping device in one embodiment of the utility model;

[0020] Figure 2 It is a vertical cross-sectional schematic diagram of a rotary clamping device in one embodiment of the utility model;

[0021] Figure 3 It is a top view schematic diagram of a rotary clamping device in one embodiment of the utility model;

[0022] Figure 4 This is a schematic diagram of the installation of a clamping block in one embodiment of the utility model;

[0023] Figure 5 It is a three-dimensional schematic diagram of a rotating drum in one embodiment of the utility model.

[0024] Description of Reference Numerals

[0025] 1. Mounting cylinder; 11. Mounting hole; 12. Limiting ring; 2. Rotating cylinder; 21. Slot; 22. Support platform; 23. Limiting platform; 24. Transmission gear ring; 3. Positioning cylinder; 4. Clamping block; 41. Clamping part; 42. Connecting part; 43. Driving part; 44. Clamping teeth; 5. Cover plate. DETAILED DESCRIPTION

[0026] The features and exemplary embodiments of various aspects of the utility model will be described in detail below. In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the utility model, rather than to limit the utility model. For those skilled in the art, the utility model can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the utility model by showing examples of the utility model.

[0027] like Figures 1 to 3As shown, the utility model provides a rotary clamping device, which includes a mounting tube 1, a rotating tube 2, a positioning tube 3, a driving device and a plurality of clamping blocks 4. The rotating tube 2 is coaxially sleeved on the outside of the mounting tube 1, and the rotating tube 2 and the mounting tube 1 can rotate relative to each other in the circumferential direction. All the clamping blocks 4 are installed on the tube wall of the mounting tube 1 at circumferential intervals. The rotating tube 2 and the positioning tube 3 are coaxially sleeved, and the driving device can drive the rotating tube 2 to rotate up or down along the axial direction of the positioning tube 3. Among them, the rotating tube 2 that rotates down can drive the clamping blocks 4 to move radially inward from the tube wall of the mounting tube 1, so that all the clamping blocks 4 clamp the new electrode inserted in the mounting tube 1 and drive the new electrode to rotate down; the rotating tube 2 that rotates up can drive the clamping blocks 4 to move radially outward from the tube wall of the mounting tube 1, so that all the clamping blocks 4 are detached from the new electrode inserted in the mounting tube 1 and rotate up with the rotating tube 2.

[0028] Specifically, the driving device can drive the rotating cylinder 2 to rotate and descend along the positioning cylinder 3 on the positioning cylinder 3, and the rotating and descending rotating cylinder 2 can drive the clamping block 4 to move radially inward from the cylinder wall of the mounting cylinder 1. All the clamping blocks 4 are installed on the cylinder wall of the mounting cylinder 1 at circumferential intervals, so these clamping blocks 4 can surround the new electrode circumferentially. These clamping blocks 4 that move radially inward from the cylinder wall of the mounting cylinder 1 can clamp the new electrode so that the new electrode is vertically fixed in the mounting cylinder 1. When the new electrode is clamped, the position of the clamping block 4 is fixed, and the driving device drives the rotating cylinder 2 to continue to rotate and descend. The rotating cylinder 2 drives the new electrode to rotate and descend through the clamping block 4 on the mounting cylinder 1, so that the new electrode is screwed into the old electrode below. After the new electrode is docked, the driving device drives the rotating cylinder 2 to rotate and ascend along the positioning cylinder 3 on the positioning cylinder 3, and the rotating and ascending rotating cylinder 2 can drive the clamping block 4 to move radially outward from the cylinder wall of the mounting cylinder 1, so that the clamping block 4 is separated from the new electrode. And the clamping block 4 that is separated from the new electrode will rotate and ascend with the rotating cylinder 2.

[0029] In this embodiment, the driving device can drive the rotating cylinder 2 to rotate and descend, and the rotating cylinder 2 that rotates and descends can drive the clamping block 4 to clamp the new electrode, and then the rotating cylinder 2 drives the clamped new electrode to rotate and descend through the clamping block 4 on the mounting cylinder 1 for rotational docking. The driving device can drive the rotating cylinder 2 to rotate and ascend, and the rotating cylinder 2 that rotates and ascends can drive the clamping block 4 to disengage the new electrode, and then the rotating cylinder 2 drives the mounting cylinder 1 to return to the initial position. Compared with the traditional rotating clamping device, the composition and structure of the rotating clamping device of the utility model are simpler, and the equipment cost is lower.

[0030] In some embodiments of the present invention, the rotating cylinder 2 can be rotated and positioned relative to the positioning cylinder 3 .

[0031] Specifically, the driving device can drive the rotating cylinder 2 to rotate relative to the positioning cylinder 3, and the rotating rotating cylinder 2 can drive the clamping block 4 to move radially inward from the cylinder wall of the mounting cylinder 1 to clamp the new electrode. After the clamping block 4 clamps the new electrode, the driving device can drive the rotating cylinder 2 to continue to rotate and descend and dock the new electrode with the old electrode. During the docking process between the new electrode and the old electrode, the rotating cylinder 2 and the clamping block 4 can support and position the new electrode to avoid the weight of the new electrode completely pressing against the old electrode, prevent the threads of the old electrode and the new electrode from being damaged, and the two electrodes are smoother when threaded together, thereby reducing the loss of replacing the electrode and improving the efficiency of electrode replacement.

[0032] like Figure 1 As shown, in some embodiments of the present invention, the positioning cylinder 3 is sleeved on the outside of the rotating cylinder 2, and the positioning cylinder 3 and the rotating cylinder 2 are threadedly connected.

[0033] Specifically, the inner wall of the positioning cylinder 3 is provided with an internal thread, and the outer wall of the rotating cylinder 2 is provided with an external thread, and the internal thread and the external thread are threadedly connected. Of course, the external thread has a sufficient height so that the new electrode can be connected to the old electrode. The positioning cylinder 3 is sleeved on the outer side of the rotating cylinder 2, which helps to reduce the volume of the rotating cylinder 2, thereby reducing the weight of the entire rotating clamping device.

[0034] In some embodiments, when the rotating cylinder 2 is in the initial position, the bottom surface of the positioning cylinder 3 is flush with the bottom surface of the rotating cylinder 2. And the vertical height of the external thread is greater than the vertical height of the internal thread, so that the rotating cylinder 2 descends sufficiently to allow the new electrode to dock.

[0035] In other embodiments, the inner wall of the positioning cylinder 3 is provided with a spirally extending slide groove, and the outer wall of the rotating cylinder 2 is provided with a row of sliders arranged in a spiral line, and the row of sliders is slidably installed in the slide groove. When the driving device drives the rotating cylinder 2 to rotate, the slider moves along the slide groove to make the rotating cylinder 2 rotate up or down.

[0036] In some embodiments of the present invention, the thread pitch of the electrode is generally 6mm-9mm, for example, the thread pitch is 6.35mm or 8.47mm. Correspondingly, the thread pitch range of the positioning cylinder 3 and the thread pitch range of the rotating cylinder 2 are 6mm-9mm, for example, the thread pitch can also be 6.35mm or 8.47mm. Therefore, the rotary clamping device of the present invention can adapt to various types of electrodes, and the rotating cylinder 2 and the new electrode are synchronously lowered, and the lowering height of the rotating cylinder 2 is the same as the lowering height of the new electrode, so as to avoid damaging the threads of the new and old electrodes due to the rotating cylinder 2 falling too fast or too slowly.

[0037] like Figure 2 and Figure 5As shown, in some embodiments of the utility model, an annular support platform 22 and an annular stop platform 23 are provided on the inner side of the rotating cylinder 2, the stop platform 23 is located above the support platform 22, and the bottom surface of the mounting cylinder 1 is in contact with the support platform 22. A stop ring 12 is provided on the outer side of the top of the mounting cylinder 1, and the bottom surface of the stop ring 12 is in contact with the top surface of the stop platform 23.

[0038] Specifically, the support platform 22 and the limit platform 23 both extend radially inward from the inner wall of the rotating cylinder 2, and the inner diameter of the support platform 22 is smaller than the inner diameter of the limit platform 23. The limit platform 23 is located above the support platform 22, and the bottom surface of the limit platform 23 is flush with the top surface of the support platform 22. The mounting cylinder 1 is mounted on the top surface of the support platform 22 to support the mounting cylinder 1. The limit platform 23 circumferentially surrounds the mounting cylinder 1, and there is a radial gap between the limit platform 23 and the mounting cylinder 1 to allow relative rotation between the mounting cylinder 1 and the rotating cylinder 2. The limit ring 12 is mounted on the top surface of the limit platform 23, and the limit platform 23 can support the limit ring 12. In addition, the slot 21 extends outward from the radial inner side surface of the limit platform 23 to the cylinder wall of the rotating cylinder 2.

[0039] like Figure 1 and Figure 2 As shown, in some embodiments of the present invention, the top surface of the rotating cylinder 2 is flush with the top surface of the limiting ring 12 , and an annular cover plate 5 is fixedly mounted on the top surface of the rotating cylinder 2 .

[0040] Specifically, the top surface of the rotating cylinder 2 is flush with the top surface of the limiting ring 12, which is helpful for installing the cover plate 5. The cover plate 5 is set to be annular, and the outer diameter of the cover plate 5 is equal to the outer diameter of the top of the rotating cylinder 2, and the inner diameter of the cover plate 5 is equal to the inner diameter of the installation cylinder 1. The cover plate 5 can limit the axial movement of the installation cylinder 1 to prevent the installation cylinder 1 from detaching from the top of the rotating cylinder 2. The cover plate 5 can be installed on the top of the rotating cylinder 2 by a plurality of bolts.

[0041] In some embodiments of the present invention, the driving device is a driving motor, the outer ring of the rotating cylinder 2 is provided with a transmission gear ring 24 , the output shaft of the driving motor is provided with a driving gear, and the driving gear is meshed with the transmission gear ring 24 .

[0042] Specifically, the transmission gear ring 24 is coaxially sleeved on the outer side of the rotating drum 2, and the transmission gear ring 24 and the rotating drum 2 are fixedly connected. The transmission gear ring 24 is located in the middle of the rotating drum 2. The transmission gear ring 24 has external meshing teeth on the radial outer side. The driving motor can drive the transmission gear ring 24 to rotate through the driving gear, and the transmission gear ring 24 can further drive the rotating drum 2 to rotate up or down.

[0043] In some embodiments, a mounting platform is provided around the radial outer side of the rotating drum 2 , and the bottom surface of the transmission gear ring 24 is attached to the top surface of the mounting platform. The mounting platform is located above the external thread of the rotating drum 2 .

[0044] like Figure 1 As shown, in some embodiments of the present invention, the positioning cylinder 3 is located below the installation cylinder 1 to facilitate the disassembly and assembly of the installation cylinder 1. For example, the installation cylinder 1 is installed on the upper part of the rotating cylinder 2, and the positioning cylinder 3 is installed on the lower part of the rotating cylinder 2.

[0045] In some embodiments, the external thread is disposed on the outer side of the lower portion of the rotating cylinder 2, and the external thread is radially opposite to the support platform 22. The outer diameter of the lower portion of the rotating cylinder 2 is smaller than the outer diameter of the upper portion of the rotating cylinder 2, and the outer diameter of the positioning cylinder 3 is equal to the diameter of the upper portion of the rotating cylinder 2, so as to reduce the weight and volume of the entire rotating clamping device.

[0046] In this embodiment, a positioning plate is provided on the outer ring of the positioning tube 3, and a screw hole extending vertically therethrough is provided on the positioning plate.

[0047] like Figures 1 to 4 As shown, in some embodiments of the utility model, a plurality of mounting holes 11 extending therethrough are provided on the wall of the mounting cylinder 1, and all the clamping blocks 4 are rotatably installed in the mounting holes 11 one by one; wherein, based on the drive of the rotating cylinder 2, the clamping portion 41 of the clamping block 4 can be rotated out of the mounting hole 11 or rotated into the mounting hole 11.

[0048] Specifically, the mounting holes 11 penetrate the wall of the mounting tube 1 along the radial direction of the mounting tube 1, and the mounting holes 11 are evenly distributed along the circumference of the mounting tube 1. When the rotating tube 2 rotates and descends, the rotating tube 2 can drive the clamping portion 41 of the clamping block 4 to rotate horizontally, so that the clamping portion 41 of the clamping block 4 can rotate out of the mounting hole 11; all the clamping portions 41 rotated out of the mounting hole 11 can clamp the new electrode, and the rotating tube 2 that rotates and descends can screw the bottom end of the new electrode to the top end of the old electrode. When the rotating tube 2 rotates and ascends, the rotating tube 2 can reversely drive the clamping portion 41 of the clamping block 4 to rotate, so that the clamping portion 41 of the clamping block 4 can rotate into the mounting hole 11; the clamping portion 41 rotated into the mounting hole 11 will be out of contact with the new electrode, and the rotating tube 2 that rotates and ascends can return to the initial position.

[0049] It should be noted that the clamping block 4 can be any structural form that can achieve the above-mentioned effect, and the cooperation between the clamping block 4 and the rotating drum 2 can also be any structural form that can achieve the above-mentioned effect, and the present utility model does not limit this.

[0050] like Figure 3 to Figure 4As shown, in some embodiments of the present invention, the clamping block 4 includes a driving portion 43, a connecting portion 42 and a clamping portion 41. The connecting portion 42 is located in the mounting hole 11, and the connecting portion 42 is connected to the mounting cylinder 1 through a pin. The driving portion 43 is connected to the side of the connecting portion 42 facing the rotating cylinder 2, and the clamping portion 41 is connected to the connecting portion 42; a plurality of card slots 21 are provided on the side of the rotating cylinder 2 facing the mounting cylinder 1, and all the driving portions 43 extend into the card slots 21 one by one.

[0051] Specifically, the driving part 43, the connecting part 42 and the clamping part 41 can be integrally formed or connected by welding or the like. The driving part 43 extends into the card slot 21 from the side of the connecting part 42 facing the rotating cylinder 2. The driving part 43 can be a block-shaped component with high structural strength. The connecting part 42 is provided with a first pin shaft hole extending vertically through, the pin shaft is vertically installed in the first pin shaft hole, and the top and bottom ends of the pin shaft are respectively connected to the cylinder wall of the mounting cylinder 1 for rotation. Of course, the radial thickness of the cylinder wall of the mounting cylinder 1 is much greater than the diameter of the pin shaft. The pin shaft helps the smooth rotation of the connecting part 42. The card slot 21 is recessed from the inner wall of the rotating cylinder 2 to the outer wall of the rotating cylinder 2, and the vertical height of the rotating cylinder 2 can be 2-3 times the vertical height of the card slot 21. Of course, the width of the card slot 21 can be greater than the width of the driving part 43, which helps to increase the rotation amplitude of the clamping part 41, and is also conducive to the clamping part 41 being completely rotated out of the mounting hole 11 or completely rotated into the mounting hole 11, thereby helping to fully clamp the new electrode. For example, the width of the slot 21 is 1.5-2 times the width of the driving portion 43 .

[0052] like Figure 4 As shown, in some embodiments of the present invention, the outer surface of the clamping portion 41 has a plurality of latch teeth 44 to increase the friction force of the outer surface of the clamping portion 41 .

[0053] Specifically, the latch teeth 44 extend outward from the outer surface of the clamping portion 41, and the latch teeth 44 can be sharp protrusions or sharp edges, etc., which are not limited by the present invention. When the clamping portion 41 is rotated out of the mounting hole 11, the latch teeth 44 can be clamped on the side surface of the new electrode.

[0054] In some embodiments, the latch teeth 44 are vertically extending edges, and the outward end of the edge is a sharp end. In other embodiments, the outer surface of the clamping portion 41 can be a frosted surface.

[0055] The utility model also provides an electrode extension device, which comprises the rotary clamping device of any one of the above embodiments.

[0056] Specifically, since the electrode extension device includes the rotary clamping device of any of the above embodiments, the electrode extension device can also achieve the beneficial effects of any of the above embodiments.

[0057] It should be noted that Figure 1 The drive device is not shown.

[0058] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the method and core ideas of the utility model. The above are only preferred implementation methods of the utility model. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of the utility model, they can make several improvements, modifications or changes, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the utility model to other occasions without improvement, should be regarded as the protection scope of the utility model.

Claims

1. A rotary clamping device, characterized in that: It comprises a mounting cylinder (1), a rotating cylinder (2), a positioning cylinder (3), a driving device and a plurality of clamping blocks (4); The rotating cylinder (2) is coaxially sleeved on the outside of the mounting cylinder (1), and the rotating cylinder (2) and the mounting cylinder (1) can rotate relative to each other in the circumferential direction, and all the clamping blocks (4) are circumferentially spaced and installed on the cylinder wall of the mounting cylinder (1); the rotating cylinder (2) and the positioning cylinder (3) are coaxially sleeved, and the driving device can drive the rotating cylinder (2) to rotate upward or downward along the axial direction of the positioning cylinder (3); The rotating cylinder (2) that is rotating downward can drive the clamping blocks (4) to move radially inward from the cylinder wall of the mounting cylinder (1), so that all the clamping blocks (4) clamp the new electrode inserted into the mounting cylinder (1) and drive the new electrode to rotate downward; the rotating cylinder (2) that is rotating upward can drive the clamping blocks (4) to move radially outward from the cylinder wall of the mounting cylinder (1), so that all the clamping blocks (4) are detached from the new electrode inserted into the mounting cylinder (1) and rotate upward with the rotating cylinder (2).

2. The rotary clamping device according to claim 1, characterized in that: The rotating cylinder (2) can be rotated and positioned relative to the positioning cylinder (3).

3. The rotary clamping device according to claim 2, characterized in that: The positioning cylinder (3) is sleeved on the outside of the rotating cylinder (2), and the positioning cylinder (3) and the rotating cylinder (2) are threadedly connected.

4. The rotary clamping device according to claim 3, characterized in that: The thread pitch of the positioning cylinder (3) ranges from 6 mm to 9 mm, and the thread pitch of the positioning cylinder (3) is the same as the thread pitch of the electrode.

5. The rotary clamping device according to claim 1, characterized in that: An annular support platform (22) and an annular limit platform (23) are provided on the inner side of the rotating cylinder (2); the limit platform (23) is located above the support platform (22); the bottom surface of the mounting cylinder (1) is in contact with the support platform (22); a limit ring (12) is provided on the outer side of the top of the mounting cylinder (1); the bottom surface of the limit ring (12) is in contact with the top surface of the limit platform (23).

6. The rotary clamping device according to claim 5, characterized in that: The top surface of the rotating cylinder (2) is flush with the top surface of the limiting ring (12), and an annular cover plate (5) is fixedly mounted on the top surface of the rotating cylinder (2).

7. The rotary clamping device according to claim 1, characterized in that: The driving device is a driving motor. The outer ring of the rotating cylinder (2) is provided with a transmission gear ring (24). The output shaft of the driving motor is provided with a driving gear, and the driving gear is meshed with the transmission gear ring (24).

8. The rotary clamping device according to any one of claims 1 to 7, characterized in that: The wall of the installation cylinder (1) is provided with a plurality of installation holes (11) extending therethrough, and all the clamping blocks (4) are rotatably installed in the installation holes (11) in a one-to-one correspondence; The clamping block (4) comprises a driving portion (43), a connecting portion (42) and a clamping portion (41); the connecting portion (42) is located in the mounting hole (11), and the connecting portion (42) is connected to the mounting cylinder (1) via a pin shaft; the driving portion (43) is connected to a side of the connecting portion (42) facing the rotating cylinder (2), and the clamping portion (41) is connected to the connecting portion (42); A plurality of slots (21) are provided on one side of the rotating cylinder (2) facing the mounting cylinder (1), and all the driving parts (43) extend into the slots (21) in a one-to-one correspondence.

9. The rotary clamping device according to claim 8, characterized in that: The outer surface of the clamping portion (41) has a plurality of latch teeth (44).

10. An electrode extension device, characterized in that: A rotary clamping device comprising the rotary clamping device described in any one of claims 1 to 9.

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