CN115399586A

CN115399586A - Rotating wheel with random variable diameter for compact shelf

Info

Publication number: CN115399586A
Application number: CN202210840751.9A
Authority: CN
Inventors: 张文渟; 杨武; 谢志新
Original assignee: Jiangxi Jinhu Insurance Equipment Group Co Ltd
Current assignee: Jiangxi Jinhu Insurance Equipment Group Co Ltd
Priority date: 2022-07-18
Filing date: 2022-07-18
Publication date: 2022-11-29
Anticipated expiration: 2042-07-18
Also published as: CN115399586B

Abstract

A variable diameter runner for a compact shelf, comprising: the Y-shaped frame comprises a central cylinder and a plurality of support arms, wherein the support arms are circumferentially arrayed on the central cylinder, a cavity is formed inside each support arm, a sliding groove is formed in the bottom of each support arm, the number of the arc arms is consistent with that of the support arms, any arc arm comprises an arc rod part and a straight handle part which are connected, the straight handle part is arranged in the cavity of each support arm, the bottom of the straight handle part is connected with a push rod part, and the push rod part is exposed out of the sliding groove; the turntable is coaxially sleeved outside the central cylinder, the circumference of the turntable is provided with through arc grooves in an array mode, and the push rod part penetrates through the arc grooves; and the handle is connected to the arc arm, and the diameter of the rotating wheel can be controlled to be adjusted or not by controlling the folding state of the handle. The handle of the invention is used as a rotating stress part and simultaneously controls the current diameter to be constant, and when the diameter is adjusted, all arc arms can be linked to move synchronously with the same amplitude by adjusting any one arc arm.

Description

Rotating wheel with random variable diameter for compact shelf

Technical Field

The invention relates to the field of reducing rotary tables, in particular to a rotating wheel capable of reducing at will for a compact shelf.

Background

The compact shelf is a novel harness suitable for books, files, prices, financial documents and goods in book data rooms, file rooms, sample rooms and the like of institutions, enterprises and public institutions, has the advantages of large storage capacity, space saving and the like compared with the conventional bookshelf, goods shelf and file shelf, and can store the files, the data and other articles on the compact shelf.

The bottom of the compact shelf is provided with an integrated chassis used for bearing a main shelf body, the integrated chassis is provided with rollers used for pushing the compact shelf to move or steer, the shelf body is provided with a rotatable rotating wheel at a certain height, and the rotating wheel is transmitted to the chassis through a power transmission system so as to drive the rollers of the chassis to rotate. However, the diameter of the current rotating wheel is fixed, that is, the diameter of the disc is constant, in the practical process, according to the mechanics principle, the larger the disc diameter is, the larger the force arm is, the more labor is saved in the rotation, but the disc needs to be adapted to the optimal operation diameter of different operations, so that the diameter of the rotating wheel needs to be adjusted, and how to fix the diameter of the current rotating wheel after adjusting to any diameter will cause the technical problem to be solved by the application.

Disclosure of Invention

The invention provides a variable diameter rotating wheel for a compact shelf to solve the problems in the prior art, and the invention is further explained below.

A variable diameter runner for a compact shelf, comprising:

a Y-shaped frame which comprises a central cylinder and a plurality of support arms, wherein the support arms are circumferentially arrayed on the central cylinder, the interior of each support arm is a hollow cavity, the bottom of each support arm is provided with a sliding chute,

the arc arms are the same as the support arms in number, any arc arm comprises an arc rod part and a straight handle part which are connected, the straight handle part is arranged in the cavity of the support arm, the bottom of the straight handle part is connected with a push rod part, and the push rod part is exposed out of the sliding groove;

the turntable is coaxially sleeved outside the central cylinder, the circumference of the turntable is provided with through arc grooves in an array mode, and the push rod part penetrates through the arc grooves;

a handle connected to the arc arm;

a protruding guide projection is arranged on the inner wall of one support arm, an arc arm is matched on the guide projection, and a gap is formed between the guide projection and the sliding groove; the bottom of the support arm is provided with a latch facing the sliding chute; the push rod part is sleeved with two rotary drums, a torsion spring sleeved outside the push rod part is arranged in each rotary drum, positioning holes are formed in the two rotary drums, and two free ends of the torsion spring are respectively matched in the positioning holes; the outer walls of the two rotary drums are integrally provided with raised clamping hook parts which can be clamped with or separated from the clamping teeth.

Preferably, the two drums are fixed to the push rod part by snap springs.

Preferably, the two clamping hook parts are connected with a first connecting rod, the end parts of the two first connecting rods are pivoted on the same first pivot, the two first connecting rods are respectively pivoted with a second connecting rod, and the two second connecting rods are pivoted on the same second pivot; the first connecting rod, the first pivot, the second connecting rod and the second pivot form a diamond structure; the first pivot or the second pivot is connected with a pull wire.

Preferably, the pull wire is connected to the second pivot, and the first pivot is provided with a through hole through which the pull wire passes. The purpose is to limit the first pivot and the second pivot through the pull wire, and maintain the deformation of the diamond-shaped mechanism in the pull wire direction so as to ensure that the two clamping hook parts synchronously move with the same amplitude.

Preferably, the inclined direction of the latch forms an obtuse angle with the pulling direction of the wire. The function is to better counteract the centrifugal force generated by the rotation of the runner.

Preferably, the arc arm is provided with a mounting groove at the joint of the arc rod part and the straight handle part, the arc rod part is provided with a through groove communicated to the mounting groove, and the through groove is matched with a movable rod; the arc arm is fixedly connected with a bracket, the handle is pivoted on the bracket through a pivot, and the end part of the handle is provided with a pressure head part with an arc surface; the movable rod is connected with a pressing plate part, and a first spring sleeved on the movable rod is arranged between the pressing plate part and the arc rod part; a movable block is arranged in the mounting groove and connected with a bayonet lock penetrating through the arc rod part, and a penetrating movable groove is formed in the movable block; the bottom of the movable rod is provided with a wedge-shaped wedge head part, the inner wall of the movable groove is provided with an inclined plane which is in surface contact with the wedge head part, and when the movable rod moves downwards, the movable block is pushed to move towards the direction far away from the push rod part; a second spring is sleeved on the clamping pin and tightly pressed between the movable block and the inner wall of the mounting groove; the bottom of the movable block is integrally connected with a winding rod, and the stay wire is connected to the winding rod.

Preferably, one side of the movable block, different from the connecting bayonet, is provided with a positioning protrusion, the straight handle part is provided with a positioning groove communicated with the mounting groove, and the positioning protrusion is matched with the positioning groove. The positioning protrusion is used for conducting redundant guiding and height fixing on the movable block together with the clamping pin.

Preferably, the bracket is fixedly provided with a stop block coaxial with the pivot, the stop block is provided with a movable notch, one end of the pivot is provided with a radially protruding stop protrusion, the stop protrusion is positioned in the movable notch, and the pivot is connected with the handle in a non-rotating manner. The stop block has the function of limiting the range of the rotation angle of the handle, and can limit the handle in the rotation process and eliminate the rotation freedom degree of the handle.

Has the advantages that: compared with the prior art, the diameter of the rotating wheel can be controlled to be adjusted or not by controlling the folding state of the handle 4, the handle 4 is used as a rotating stress part and simultaneously controls the current diameter to be constant, and when the diameter is adjusted, all the arc arms can be linked to move synchronously at the same amplitude by adjusting any one arc arm.

Drawings

FIG. 1: a top view of the wheel of the present invention;

FIG. 2: the structure in FIG. 1 is shown inbase:Sub>A sectional view at A-A;

FIG. 3: the structure at A in FIG. 2 is enlarged schematically;

FIG. 4: the structure at B in FIG. 2 is enlarged schematically;

FIG. 5: the structure of the rhombus structure pulling drum is schematic;

FIG. 6: the pivot and the stop block are matched;

in the figure: the device comprises a Y-shaped frame 1, a central barrel 101, a support arm 102, a sliding groove 103, a guide protrusion 104, a spacing 105, a latch 106, an arc arm 2, an arc rod part 201, a straight handle part 202, a push rod part 203, a mounting groove 204, a through groove 205, a positioning groove 206, a rotary disc 3, an arc groove 301, a handle 4, a pressure head part 401, a rotary drum 5, a positioning hole 501, a clamping hook part 502, a clamping spring 6, a torsion spring 7, a first connecting rod 8, a first pivot 9, a second connecting rod 10, a second pivot 11, a pull wire 12, a movable rod 13, a pressure plate part 131, a wedge head part 132, a support 14, a stop block 141, a movable notch 142, a pivot 15, a stop protrusion 151, a first spring 16, a movable block 17, a movable groove 171, an inclined plane 172, a winding rod 173, a positioning protrusion 174, a clamping pin 18 and a second spring 19.

Detailed Description

A specific embodiment of the present invention will be described in detail with reference to fig. 1-6.

Referring to fig. 1-4, an arbitrarily variable diameter rotating wheel for a compact shelf comprises a Y-shaped shelf 1, wherein the Y-shaped shelf 1 comprises a central cylinder 101 and support arms 102 which are integrally connected, the number of the support arms 102 is three, the support arms 102 are circumferentially arrayed on the central cylinder 101, a cavity is arranged inside the support arms 102, a sliding groove 103 is arranged at the bottom of the support arms to communicate the cavity to the outside of the support arms, and the central cylinder 101 is connected to an input end of a mechanism such as an integrated chassis of the compact shelf; any support arm 102 is connected with an arc arm 2, the arc arm 2 comprises an arc rod part 201 and a straight handle part 202 which are integrally connected, the straight handle part 202 is arranged in a cavity of the support arm 102, the straight handle part 202 can slide relative to the cavity under the guidance of the cavity, the bottom of the straight handle part 202 is integrally connected with a push rod part 203, and the push rod part 203 is exposed out of the sliding groove 103; a rotating disc 3 is coaxially sleeved outside the central cylinder 101, through arc grooves 301 are formed in the rotating disc 3 in a circumferential array mode, and the push rod portion 203 penetrates through the arc grooves 301.

Above-mentioned Y shape frame 1, arc arm 2, carousel 3 constitutes a radial synchronous motion structure, specifically, control arbitrary arc arm 2 and for Y shape frame 1 radial slip, push rod portion 203 is through the contact effect with arc groove 301 inner wall and then promote carousel 3 and rotate certain angle during the synchronous radial displacement, pivoted carousel 3 promotes all the other push rod portion 203 radial movement, and then all the other arc arms of interlock 2 are for Y shape frame 1 radial slip, all the other arc arm 2 synchronous motions of accessible carousel 3 interlock when acting on arbitrary arc arm 2 promptly, all the arc arms 2 are synchronous and the same amplitude action in effect.

A handle 4 is connected to the arc arm 2, and the handle 4 is used for an operator to act to drive the Y-shaped frame 1 to rotate.

Through the adjustable runner of above-mentioned structure and action principle to arbitrary diameter, Y shape frame 1, arc arm 2, carousel 3's centroid and focus are close to the coincidence, but rotate the in-process, arc arm 2 exists the risk of breaking away from with Y shape frame 1 under the effect of centrifugal force, and this embodiment is adjusting to the fixed current diameter behind the arbitrary diameter through following technical scheme: a protruding guide protrusion 104 is arranged on the inner wall of one arm 102 of the Y-shaped frame 1, an arc arm 2 is matched on the guide protrusion 104, and a gap 105 is formed between the guide protrusion 104 and the sliding groove 103; the bottom of the support arm 102 is provided with a latch 106 facing the sliding chute 103, the push rod part 203 is sleeved with two rotating cylinders 5, the two rotating cylinders 5 are attached to each other, the two rotating cylinders 5 are fixed on the push rod part 203 at a fixed height through a clamp spring 6, and the two rotating cylinders 5 have relative rotation freedom; a torsion spring 7 sleeved outside the push rod part 203 is arranged in the two rotary drums 5, positioning holes 501 are formed in the two rotary drums 5, and two free ends of the torsion spring 7 are respectively matched in the positioning holes 501; the outer walls of the two drums 5 are integrally provided with raised hook portions 502, and the hook portions 502 can be engaged with or disengaged from the latches 106.

When the diameter of the current rotating wheel needs to be changed, the clamping hook parts 502 of the two rotating drums 5 are driven to rotate oppositely, namely the included angle between the two clamping hook parts 502 is reduced, the torsional spring 7 recovers deformation and energy storage is reduced, at the moment, the clamping hook parts 502 are separated from the latch 106, and at the moment, the arc arm 2 is pulled to change the diameter of the rotating wheel in a linkage manner; after the target diameter is adjusted, the two rotary drums 5 rotate in the opposite directions under the driving of external power, the included angle between the two clamping hook portions 502 is enlarged, the clamping hook portions 502 and the clamping teeth 106 restore the clamping state, the torsion springs 7 are deformed to store energy, the rotating wheel is rotated at the moment, and the arc arm 2 is fixed relative to the Y-shaped frame based on the clamping state of the clamping hook portions 502 and the clamping teeth 106.

Referring to fig. 5, two hook portions 502 are connected to a first connecting rod 8, ends of the two first connecting rods 8 are pivoted to a same first pivot 9, the two first connecting rods 8 are respectively pivoted to a second connecting rod 10, the two second connecting rods 10 are pivoted to a same second pivot 11, and the first connecting rod 8, the first pivot 9, the second connecting rod 10 and the second pivot 11 form a diamond structure; the second pivot 11 is connected with a pull wire 12, and the pull wire 12 is connected to a pulling assembly and used for driving the two rotary drums 5 to rotate synchronously.

After the target diameter is reached, the hook portion 502 is controlled to be engaged with the latch 106 by pulling the pull wire 12 to fix the current diameter: after the pull wire 12 is pulled, the pull wire 12 is linked to deform the rhombic structure, the included angle of the two first connecting rods 8 is increased, the two rotary drums 5 are linked to rotate in opposite directions, namely the included angle of the two clamping hook parts 502 is increased, the clamping hook parts 502 abut against the latch 106, the arc arm 2 is pulled outwards in the pull wire direction, the push rod part 203 moves forwards by a small distance, namely the clamping hook parts are clamped on the latch 106, and at the moment, the rotating wheel keeps the current diameter unchanged under the action of centrifugal force; when the diameter of the rotating wheel needs to be changed, the pulling force of the pull wire 12 on the diamond structure is released, at the moment, the two rotating drums 5 rotate under the elastic force of the torsional spring 7 which restores to deform, the hook portion 502 is disengaged from the latch 106, the push rod portion 203 (the arc arm 2) has relative displacement relative to the latch 106 (the Y-shaped frame 1) at the moment of disengagement, in practice, an operator can push the arc arm 2 instead of relying on the elastic force of the torsional spring 7, the purpose of overcoming the friction force between the arc arm 2 and the Y-shaped frame 1 is achieved, and the elastic force of the torsional spring 7 maintains the state that the hook portion 502 is disengaged from the latch 106 so as to adjust the diameter of the rotating wheel.

The two drums 5 are vertically sleeved on the push rod portion 203, and the hook portions 502 on the two drums are matched with the latch 106. At this time, one first link 8 is located at the top of the upper hook 502, and the other first link 8 is located at the bottom of the lower hook 502, i.e. there is a height difference between the two first links 8 and the second link 10, and the height difference is compensated and connected by the first pivot 9 and the second pivot 11, i.e. there is a certain length between the first pivot 9 and the second pivot 11. Based on this, the pulling wire 12 is connected to the second pivot 11, and the first pivot 9 is provided with a through hole through which the pulling wire 12 passes, so as to limit the first pivot 9 and the second pivot 11 by the pulling wire, and maintain the deformation of the diamond-shaped mechanism in the pulling direction, thereby ensuring the two hook portions 502 to synchronously operate at the same amplitude.

The inclined direction of the latch 106 forms an obtuse angle with the pulling direction of the pull wire, and the function is to better counteract the centrifugal force generated by the rotation of the rotating wheel.

According to the above, the handle 4 is operated by an operator to drive the Y-shaped frame 1 to rotate, on one hand, before rotation, the pull wire 12 is required to pull the diamond-shaped structure so that the hook portion 502 is clamped with the latch 106 to fix the current diameter of the rotating wheel, and when the diameter needs to be changed, the pull wire 12 is required to release the pulling force on the diamond-shaped structure; on the other hand, when the rotating wheel is rotated, the handle 4 is required to be perpendicular to the arc arm 2, and when the rotating wheel is not operated, the handle 4 is required to be folded and leaned on the arc arm 2, so that the occupied space is reduced. It can be seen that the handle 4 has two states, and the pull wire 12 also has two effects on the diamond structure, based on which, the pull force control source for the pull wire 12 is set as the handle 4 in the present embodiment, i.e. the operation component of the present invention can be controlled as a single component, and the specific scheme is as follows:

the arc arm 2 is provided with a mounting groove 204 at the joint of the arc rod part 201 and the straight handle part 202, the arc rod part 201 is provided with a through groove 205 communicated to the mounting groove 204, the through groove 205 is matched with a movable rod 13, and the movable rod 13 can move at the through groove 205; the arc arm 2 is fixedly connected with a bracket 14, the handle 4 is pivoted on the bracket 14 through a pivot 15, the handle 4 can rotate around the pivot 15, and the end part of the handle 4 is provided with a pressure head part 401 with an arc surface; the movable rod 13 is integrally connected with a pressing plate part 131, a first spring 16 sleeved on the movable rod 13 is arranged between the pressing plate part 131 and the arc rod part 201, and the pressing plate part 401 has a pushing effect on the pressing plate part 131 in the rotating process of the handle 4 and can push the movable rod 13 to move downwards; a movable block 17 is arranged in the mounting groove 204, the movable block 17 is in threaded connection with a bayonet 18 penetrating through the arc rod part 201, the bayonet 18 has the function that the movable block 17 can be arranged in the mounting groove 204 when the movable block 17 is mounted in a detachable connection mode, the movable block 17 is positioned at a certain height, and a penetrating movable groove 171 is formed in the movable block 17; the bottom of the movable rod 13 is provided with a wedge-shaped wedge head 132, the inner wall of the movable groove 171 is provided with an inclined plane 172 in surface contact with the wedge head 132, the surface contact has the function of converting the vertical action of the movable rod 13 into the horizontal action of the movable block 17, and it should be noted that the reversing direction is the direction in which the movable block 17 is pushed to move away from the push rod part 203 when the movable rod 13 moves downwards; the bayonet pin 18 is sleeved with a second spring 19, and the second spring 19 is tightly pressed between the movable block 17 and the inner wall of the mounting groove 204; a winding rod 173 is integrally connected to the bottom of the movable block 17, and the pull wire 12 is connected to the winding rod 173.

Furthermore, a positioning protrusion 174 is arranged on one side of the movable block 17 different from the side connected with the bayonet 18, a positioning groove 206 communicated with the mounting groove 204 is arranged on the straight handle part 202, the positioning protrusion 174 is matched with the positioning groove 206, and the positioning protrusion 174 and the bayonet 18 are used for conducting redundant guiding and height fixing on the movable block 17. The positioning protrusion 174 and the positioning groove 206 are in clearance fit or a vent groove communicated with the positioning groove 206 is formed on the straight shank portion 202, so as to avoid the obstruction of the pressure difference to the action of the movable block 17.

Referring to fig. 6, a stop block 141 coaxial with the pivot 15 is fixedly disposed on the bracket 14, the stop block 141 has a movable notch 142, one end of the pivot 15 is provided with a radially protruding stop protrusion 151, the stop protrusion 151 is disposed in the movable notch 142, and the pivot 15 is connected to the handle 4 without rotation. The stop block 141 is used to limit the range of the rotation angle of the handle 4, for example, 0 to 90 ° in this embodiment, that is, when the handle 4 is at two limit positions, the handle is respectively in a state of being folded toward the arc arm 2 and in a state of being operated by the vertical arc arm 2, and the handle can be limited during the rotation process, so that the degree of freedom of the rotation is eliminated.

The working principle of the runner is completely explained in the embodiment:

sleeving a central tube 101 of a Y-shaped frame 1 of a rotating wheel on an input end of a mechanism such as an integrated chassis of a compact shelf, and synchronously rotating the Y-shaped frame 1 and the input end; when the diameter of the current rotating wheel needs to be changed, the handle 4 is folded to be close to the arc arm 2, the arc arm 2 is pulled out or pushed inwards, the length of the straight handle part 202 of any arc arm 2 matched with the cavity inside the support arm 102 of the Y-shaped frame 1 is changed in the radial direction, the push rod part 203 is in contact with the inner wall of the arc groove 301 during synchronous radial displacement, the rotating disc 3 is further pushed to rotate by a certain angle, the rotating disc 3 pushes the rest push rod parts 203 to move in the radial direction, and then the rest arc arms 2 are linked to slide in the radial direction of the Y-shaped frame 1, namely, the rest arc arms 2 can be linked to move synchronously through the rotating disc 3 and move in the same amplitude when acting on any arc arm 2.

After the target diameter is reached, the rotating wheel is rotated through the handle 4, the folded handle 4 is rotated at the moment, when the handle 4 is rotated to the state of being vertical to the arc arm 2, the stop boss 151 which is radially protruded on the pivot 15 which rotates synchronously with the handle abuts against the stop block 141 on the bracket 14, and the rotation cannot be continued; meanwhile, in the rotation process of the handle 4, the cambered pressure head part 401 at the end part presses the plate part 131 downwards to push the movable rod 13 to move downwards and compress the first spring 16, when the movable rod 13 moves downwards, the wedge head part 132 at the end part pushes the movable block 17 to move towards the direction far away from the push rod part 203 and compress the second spring 19 after contacting with the inclined surface of the movable groove 171 in the movable block 17, at the moment, the distance between the movable block 17 and the winding rod 173 on the movable block 17 and the push rod part 203 is increased, the winding rod 173 pulls the rhombic structure sleeved on the push rod part 203 through the pull wire 12 connected with the winding rod 173, the included angle of the two first connecting rods 8 is increased, the two linked rotary drums 5 rotate towards opposite directions, the included angle of the two clamping hook parts 502 is increased, the clamping hook parts 502 abut against the clamping teeth 106, the arc arm 2 is pulled outwards towards the pull wire direction, the push rod part 203 can be clamped and blocked on the clamping teeth 106 by a slight distance when the push rod part 203 moves forwards, and at the rotary wheel maintains the current diameter unchanged under the action of centrifugal force.

When the diameter of the rotating wheel needs to be changed again next time, the handle 4 is folded again, the movable rod 13 jacks up the movable rod 13 under the elastic force of the first spring 16 restoring deformation, the movable block 17 loses the lateral displacement under the elastic force of the second spring 19 restoring deformation after the movable rod 13 is blocked, the pull wire 12 releases the pull force on the diamond structure at the moment, the arc arm 2 is radially pushed in the direction of reducing the diameter, the two rotary drums 5 rotate under the elastic force of the torsional spring 7 restoring deformation, the hook part 502 is disengaged from the latch 106, and the elastic force of the torsional spring 7 maintains the state that the hook part 502 is disengaged from the latch 106 so as to adjust the diameter of the rotating wheel.

The diameter of the rotating wheel can be controlled to be adjusted or not by controlling the folding state of the handle 4, the handle 4 is used as a rotating stress part and simultaneously controls the current diameter to be constant, and when the diameter is adjusted, all arc arms can be linked to move synchronously and at the same amplitude by adjusting any one arc arm.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A but, arbitrary reducing runner for intensive, characterized by that includes:

a Y-shaped frame (1) which comprises a central cylinder (101) and a plurality of support arms (102), wherein the support arms (102) are circumferentially arrayed on the central cylinder (101), the interior of each support arm (102) is a cavity, the bottom of each support arm is provided with a sliding chute (103),

the number of the arc arms (2) is consistent with that of the support arms, any arc arm (2) comprises an arc rod part (201) and a straight handle part (202) which are connected, the straight handle part (202) is arranged in a cavity of the support arm (102), the bottom of the straight handle part (202) is connected with a push rod part (203), and the push rod part (203) is exposed out of the sliding groove (103);

the turntable (3) is coaxially sleeved outside the central cylinder (101), the circumference of the turntable is provided with through arc grooves (301), and the push rod part (203) penetrates through the arc grooves (301);

a handle (4) connected to the arc arm (2);

a protruding guide projection (104) is arranged on the inner wall of the support arm (102), the arc arm (2) is matched on the guide projection (104), and a gap (105) is formed between the guide projection (104) and the sliding groove (103); the bottom of the support arm (102) is provided with a latch (106) facing the sliding groove (103); the push rod part (203) is sleeved with two rotary drums (5), torsion springs (7) sleeved outside the push rod part (203) are arranged in the two rotary drums (5), positioning holes (501) are formed in the two rotary drums (5), and two free ends of the torsion springs (7) are respectively matched in the positioning holes (501); the outer walls of the two rotary drums (5) are integrally provided with raised clamping hook parts (502), and the clamping hook parts (502) can be clamped with or separated from the clamping teeth (106).

2. The discretionary variable diameter rotor of claim 1, wherein: the two rotary drums (5) are fixed on the push rod part (203) through clamp springs (6).

3. The discretionary variable diameter rotor of claim 1, wherein: the two clamping hook parts (502) are connected with a first connecting rod (8), the end parts of the two first connecting rods (8) are pivoted on the same first pivot (9), the two first connecting rods (8) are respectively pivoted with a second connecting rod (10), and the two second connecting rods (10) are pivoted on the same second pivot (11); the first connecting rod (8), the first pivot (9), the second connecting rod (10) and the second pivot (11) form a diamond structure; the first pivot (9) or the second pivot (11) is connected with a pull wire (12).

4. The discretionary variable diameter rotor of claim 3, wherein: the pull wire (12) is connected to the second pivot (11), a through hole is arranged on the first pivot (9), and the pull wire (12) penetrates through the through hole.

5. The discretionary variable diameter rotor of claim 4, wherein: the inclined direction of the latch (106) forms an obtuse angle with the pulling direction of the pull wire.

6. The discretionary variable diameter rotor of claim 4, wherein: the arc arm (2) is provided with a mounting groove (204) at the joint of the arc rod part (201) and the straight handle part (202), the arc rod part (201) is provided with a through groove (205) communicated to the mounting groove (204), and the through groove (205) is matched with a movable rod (13); a bracket (14) is fixedly connected to the arc arm (2), the handle (4) is pivoted on the bracket (14) through a pivot (15), and the end part of the handle (4) is provided with a pressure head part (401) with an arc surface; the movable rod (13) is connected with a pressing plate part (131), and a first spring (16) sleeved on the movable rod (13) is arranged between the pressing plate part (131) and the arc rod part (201); a movable block (17) is arranged in the mounting groove (204), the movable block (17) is connected with a bayonet lock (18) penetrating through the arc rod part (201), and a penetrating movable groove (171) is formed in the movable block (17); the bottom of the movable rod (13) is provided with a wedge-shaped wedge head part (132), the inner wall of the movable groove (171) is provided with an inclined surface (172) which is in surface contact with the wedge head part (132), and when the movable rod (13) moves downwards, the movable block (17) is pushed to move towards the direction far away from the push rod part (203); the bayonet lock (18) is sleeved with a second spring (19), and the second spring (19) is tightly pressed between the movable block (17) and the inner wall of the mounting groove (204); the bottom of the movable block (17) is integrally connected with a wire winding rod (173), and the pull wire (12) is connected to the wire winding rod (173).

7. The discretionary variable diameter rotor of claim 6, wherein: the movable block (17) is provided with a positioning protrusion (174) on one side different from the side connected with the bayonet lock (18), the straight handle part (202) is provided with a positioning groove (206) communicated with the mounting groove (204), and the positioning protrusion (174) is matched with the positioning groove (206).

8. The discretionary variable diameter rotor of claim 6, wherein: the stop block (141) coaxial with the pivot (15) is fixedly arranged on the support (14), the stop block (141) is provided with a movable notch (142), one end of the pivot (15) is provided with a radially protruding stop protrusion (151), the stop protrusion (151) is positioned in the movable notch (142), and the pivot (15) is connected with the handle (4) in a non-rotating manner.