Portable fixing device

Abstract

The utility model provides a portable fixing device. The portable fixing device comprises a mounting part, a connecting part and a locking assembly, the mounting part is used for mounting a to-be-fixed object; the connecting part is of a cylindrical structure and is composed of a plurality of connecting plates distributed in the circumferential direction, the first ends of the connecting plates are hinged to the first end of the mounting part, and the connecting plates can turn over in the plane where the axis of the connecting part is located; the locking assembly is used for locking the overturning state of the connecting plate; a plurality of magnetic attraction blocks are embedded in the connecting plate, and the inner side surfaces and the outer side surfaces of the magnetic attraction blocks protrude out of the inner side surfaces and the outer side surfaces of the connecting plate correspondingly. Based on the technical scheme of the utility model, on the basis of iron or iron alloy fixing members such as vehicles, workbenches and the like on a field construction site, corresponding indicating tools can be fixed by at least adopting a magnetic attraction mode, and the structure of the indicating tool is adjustable, so that the indicating tool can adapt to different fixing positions and fixing modes. Meanwhile, the overall size of the fixing device is moderate, and the fixing device has good portability.

Description

Technical Field

[0001] The utility model relates to the technical field of connecting components, in particular to a portable fixing device. Background Art

[0002] The process of oil and gas extraction involves a lot of field construction, and some indicator tools are often used temporarily at the construction site, such as wind vane, anemometer or some other indicator flags, signs, etc. These tools will first face the problem of how to fix them during field construction. At present, most of the fixing methods for these tools are to insert the corresponding fixing rod into the ground, or to set a larger base at the bottom of the fixing rod and place it directly on the ground. For example, the prior art with announcement number CN209342751U uses a larger base, but the actual use effect of the above two methods is not good.

[0003] Among them, since the above-mentioned indicating tools usually need to be installed at a higher place, a long fixing rod is often required, and the stability of a long fixing rod is poor. If it is directly inserted into the ground or placed on a base, but the base is not large or heavy enough, it is very easy to tilt or even fall. If a base of sufficient size and weight is used, its transportation and installation are very troublesome, and it is not portable enough for field construction. Utility Model Content

[0004] In order to solve the above problems in the prior art, the utility model proposes a portable fixing device.

[0005] The utility model provides a portable fixing device, comprising:

[0006] A mounting portion, which is used to mount the object to be fixed;

[0007] The connecting portion is configured as a cylindrical structure and is composed of a plurality of connecting plates distributed along the circumferential direction, wherein the connecting plate is configured as a strip structure extending along the axial direction of the connecting portion and a first end of the connecting plate is hinged to the first end of the mounting portion, and the connecting plate can be turned over in the plane where the axis of the connecting portion is located; and

[0008] A locking assembly, used for locking the flipped state of the connecting plate, so that the connecting plate is fixed relative to the mounting portion when flipped to be parallel or perpendicular to the axial direction of the connecting portion;

[0009] Wherein, a plurality of magnetic blocks are embedded on the connecting plate, and the inner and outer surfaces of the magnetic blocks protrude from the inner and outer surfaces of the connecting plate respectively.

[0010] In one embodiment, the locking assembly includes a sleeve sleeved at the connection between the mounting portion and the connecting portion, the connecting plate is configured with a locking member protruding from the outer wall thereof near the first end thereof, the locking member is bent toward the side where the mounting portion is located and is spaced from the outer wall of the connecting portion;

[0011] Wherein, when the connecting plate is in a state parallel to the axial direction of the connecting portion, the sleeve can be partially inserted into the bayonet formed between the locking member and the outer wall of the connecting portion by moving along the axial direction of the connecting portion, and the sleeve now spans the mounting portion and the connecting portion;

[0012] When the connecting plate is in a state perpendicular to the axial direction of the connecting portion, the sleeve can abut against the locking member, and the sleeve is now sleeved outside the mounting portion.

[0013] In one embodiment, when the connecting plate is in a state perpendicular to the axial direction of the connecting portion, an end of the locking member close to the first end of the connecting plate abuts against an outer wall of the mounting portion.

[0014] In one embodiment, a positioning step is configured on the outer wall of the mounting portion, the sleeve is located between the positioning step and the connecting portion, and a spring is disposed between one end of the sleeve and the positioning step.

[0015] In one embodiment, the mounting portion is cylindrical in shape, the sleeve is a cylinder threadably matched with an outer wall of the mounting portion, and the plurality of bayonet holes corresponding to the plurality of locking members are located on the circumference of the same circle.

[0016] In one embodiment, the mounting portion is cylindrical in shape, and the connecting portion is coaxial with the mounting portion and has the same outer diameter as the connecting portion, or the connecting portion is coaxial with the mounting portion but has a smaller outer diameter as the cylindrical or non-cylindrical structure.

[0017] In one embodiment, the mounting portion is configured as a cylindrical structure capable of at least partially accommodating the object to be fixed, and a partition is provided inside the mounting portion near the first end thereof, and a through hole is opened on the partition.

[0018] In one embodiment, a bolt is passed through the cylinder of the mounting portion, and the bolt is used to tighten the portion of the object to be fixed accommodated in the mounting portion.

[0019] In one embodiment, the plurality of magnetic blocks are evenly spaced apart along the length direction of the connecting plate, and the inner and outer side surfaces of all the magnetic blocks on one connecting plate are flush with each other.

[0020] In one embodiment, the connecting plate is a flat plate structure and a plurality of the connecting plates form the connecting portion of a square cylindrical structure; or, the connecting plate is an arc-shaped plate structure and a plurality of the connecting plates form the connecting portion of a cylindrical structure;

[0021] Wherein, for the connecting plate of the arc-shaped plate structure, in a cross section perpendicular to the axis of the connecting portion, the connecting plate is completely located in the area between the inner and outer surfaces of the magnetic attraction block.

[0022] The above technical features can be combined in various suitable ways or replaced by equivalent technical features as long as the purpose of the utility model can be achieved.

[0023] The portable fixing device provided by the utility model has at least the following features compared with the prior art:

[0024] Beneficial effects:

[0025] The utility model is a portable fixing device, based on the field construction site with iron or iron alloy fixing components such as vehicles and workbenches, which can at least use magnetic suction to fix the corresponding indicating tool, is easy to operate, has high stability, and its structure is adjustable, which can adapt to different fixing positions and fixing methods. At the same time, the overall size of the fixing device is moderate, and has good portability. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0027] Figure 1 A schematic diagram showing the structure of the fixing device of the utility model in a folded state;

[0028] Figure 2 A schematic diagram showing the structure of the fixing device of the utility model in an unfolded state;

[0029] Figure 3 A cross-sectional schematic diagram showing one structure of the connecting portion of the fixing device of the present invention;

[0030] Figure 4 A cross-sectional schematic diagram showing another structure of the connecting portion of the fixing device of the present invention;

[0031] Figure 5 A structural schematic diagram showing another optional implementation of the fixing device of the utility model.

[0032] In the drawings, like reference numerals are used for like parts. The drawings are not necessarily to scale.

[0033] Reference numerals:

[0034] 1-installation part, 11-partition, 12-through hole, 2-connecting part, 21-connecting plate, 22-magnetic block, 23-locking piece, 24-bayonet, 3-locking assembly, 31-sleeve, 4-spring, 5-bolt. DETAILED DESCRIPTION

[0035] The utility model will be further described below in conjunction with the accompanying drawings.

[0036] An embodiment of the utility model provides a portable fixing device, comprising a mounting portion 1, a connecting portion 2 and a locking assembly 3; the mounting portion 1 is used to mount an object to be fixed; the connecting portion 2 is constructed as a cylindrical structure and is composed of a plurality of connecting plates 21 distributed along the circumferential direction, the connecting plate 21 is constructed as a strip structure extending along the axial direction of the connecting portion 2 and its first end is hinged to the first end of the mounting portion 1, and the connecting plate 21 can be flipped within a plane where the axis of the connecting portion 2 is located; the locking assembly 3 is used to lock the flipping state of the connecting plate 21, so that the connecting plate 21 is relatively fixed to the mounting portion 1 when flipped to be parallel or perpendicular to the axial direction of the connecting portion 2; wherein, a plurality of magnetic blocks 22 are embedded on the connecting plate 21, and the inner and outer surfaces of the magnetic blocks 22 protrude from the inner and outer surfaces of the connecting plate 21 respectively.

[0037] Specifically, as shown in the attached figure Figure 1 As shown, the fixing device of the utility model mainly includes three parts in structure: a mounting part, a connecting part and a locking assembly, wherein:

[0038] The mounting portion 1 is used to mount the object to be fixed, and its specific structure and the specific mounting method with the object to be fixed can be selected according to the specific situation. For example, in the present embodiment, the object to be fixed is a windsock, anemometer, and various flags and signs. These tools themselves have a rod body in structure. Therefore, optionally, the mounting portion 1 is constructed as a cylindrical structure that can at least partially accommodate the object to be fixed. The rod body of the above-mentioned tool can be at least partially inserted into the mounting portion 1, and a partition 11 is provided inside the mounting portion 1 near its first end. The partition 11 can stably support the bottom of the rod body. A through hole 12 (with a radial dimension smaller than the rod body) is further provided on the partition 11. The through hole 12 is connected to the inside of the connecting portion 2 for draining rainwater or other debris entering the inside of the mounting portion 1. Preferably, a bolt 5 is penetrated on the barrel of the mounting portion 1, and the bolt 5 is used to tighten the part of the object to be fixed accommodated in the mounting portion 1 (i.e., the rod body), so as to further strengthen the connection between the object to be fixed and the mounting portion 1.

[0039] The connecting portion 2 is connected to the first end of the mounting portion 1. The connecting portion 2 is a cylindrical structure formed by splicing a plurality of connecting plates 21 along the circumferential direction. The first end of the connecting plate 21 is hinged to the first end of the mounting portion 1. The hinge axis is perpendicular to the axis of the connecting portion 2. Therefore, each connecting plate 21 can be flipped in the plane where the axis of the connecting portion 2 is located, and then the connecting portion 2 as a whole exists as shown in the figure. Figure 1 and Figure 2 The folded and fully extended states are shown respectively. A magnetic block 22 is embedded in the connecting plate 21. The function of the magnetic block 22 is to enable the connecting part 2 to be fixed on other fixed components at the construction site (according to actual observations, most components at outdoor construction sites are made of iron or iron alloys, so they can meet the basic conditions for magnetic fixation), thereby achieving the fixation of the aforementioned tools. Depending on the state of the connecting part 2, the fixing method may vary. For example, if the side of other fixed components at the construction site can be fixed, the connecting part 2 can be placed in a folded state, as shown in the attached figure. Figure 1 As shown, at this time, the outer surface of the magnetic block 22 on any one of the connecting plates 21 can be adsorbed on the side of the corresponding fixed component (such as the top side of the vehicle, the side of various workbenches), so as to keep the mounting portion 1 and the connecting portion 2 in a vertical state and complete the fixation of the tool; if the top surface of other fixed components on the construction site is available for fixation, the connecting portion 2 can be placed in a fully extended state, as shown in the accompanying drawings Figure 2 As shown, at this time, the multiple unfolded connecting plates 21 form a structure similar to a base, and the inner side surface of the magnetic block 22 on the connecting plate 21 forms the bottom surface of the base, thereby adsorbing on the top surface of the corresponding fixed component (such as the roof of the vehicle, the top of various workbenches), keeping the installation part 1 and the connecting part 2 in a vertical state, and completing the fixation of the tool. At the same time, for other rod-shaped fixing components of suitable size at the construction site, the connecting part 2 can be folded into a cylindrical structure, so that the rod-shaped fixing component can be relatively inserted into the interior of the connecting part 2, and the tool can also be fixed.

[0040] The locking assembly 3 is used to lock the folded or unfolded state of the connecting plate 21 of the connecting part 2 so that the connecting plate 21 maintains the corresponding state, thereby achieving stability in the fixing device fixing the corresponding tool on other fixing components at the construction site.

[0041] In addition, when the mounting portion 1 and the connecting portion 2 are folded into a rod shape, the length does not exceed 0.5m, and the radial dimension does not exceed 5cm, which has good portability. The connection plate 21 of the connecting portion 2 can be flexibly selected. For example, in this embodiment, the connecting portion 2 is composed of four connection plates 21 of the same size, and two adjacent connection plates 21 in the circumferential direction are in an orthogonal orientation to each other, so the cross-sectional shape of the connecting portion 2 is a square or a circle, as shown in the accompanying drawings. Figure 3 and Figure 4 shown.

[0042] According to the above content, it can be seen that the fixing device of the utility model, based on the iron or iron alloy fixing components such as vehicles and workbenches at the field construction site, can at least use magnetic suction to fix the corresponding indicating tools, which is easy to operate and has high stability. Its structure is adjustable and can adapt to different fixing positions and fixing methods. At the same time, the overall size of the fixing device is moderate and has good portability.

[0043] Preferably, multiple magnetic blocks 22 are evenly spaced along the length direction of the connecting plate 21, and the inner and outer surfaces of all the magnetic blocks 22 on a connecting plate 21 are flush with each other, that is, the inner surfaces of all the magnetic blocks 22 on a connecting plate 21 are flush with each other, and the outer surfaces are also flush with each other, thereby ensuring that the magnetic blocks 22 can stably engage with the corresponding fixed plane.

[0044] In one embodiment, the locking assembly 3 includes a sleeve 31 that is sleeved at the connection between the mounting portion 1 and the connecting portion 2. The connecting plate 21 is configured with a locking member 23 protruding from its outer wall near its first end. The locking member 23 is bent toward the side where the mounting portion 1 is located and is spaced from the outer wall of the connecting portion 2.

[0045] Among them, when the connecting plate 21 is in a state parallel to the axial direction of the connecting part 2, the sleeve 31 can be partially inserted into the bayonet 24 formed between the locking piece 23 and the outer wall of the connecting part 2 by moving along the axial direction of the connecting part 2, and the sleeve 31 now spans the mounting part 1 and the connecting part 2; when the connecting plate 21 is in a state perpendicular to the axial direction of the connecting part 2, the sleeve 31 can abut against the locking piece 23, and the sleeve 31 is now sleeved outside the mounting part 1.

[0046] Specifically, as shown in the attached figure Figure 1 As shown, the locking assembly 3 mainly includes a sleeve 31, which can cooperate with the locking member 23 on the connecting plate 21 to achieve locking of the connecting plate 21 in the flipped state. When the connecting plate 21 is in the retracted state (the connecting plate 21 is parallel to the axial direction of the connecting portion 2), as shown in the accompanying drawings Figure 1 As shown, a bayonet 24 is formed between the locking piece 23 protruding from the outer wall of the connecting plate 21 and the connecting plate 21, and the bayonet 24 faces the sleeve 31. At this time, the sleeve 31 can be moved and inserted into the bayonet 24, so that the connecting plate 21 cannot be turned outward, and the multiple connecting plates 21 are tightly spliced ​​with each other, which restricts them from turning inward further. Therefore, at this time, the sleeve 31 can lock the connecting plate 21 in a retracted state, and the sleeve 31 can be moved upward out of the bayonet 24 to release the lock.

[0047] When the connecting plate 21 is in a fully expanded state (the connecting plate 21 is perpendicular to the axial direction of the connecting portion 2), as shown in the accompanying drawings Figure 2As shown, the locking member 23 corresponds to the mounting portion 1 and the end of the sleeve 31 after the connecting plate 21 is turned outward, and the wall of the bayonet 24 facing the mounting portion 1, and at this time, the end of the sleeve 31 can abut the outer wall of the locking member 23. The further turning outward of the connecting plate 21 can be limited by the maximum rotation angle of the hinge, and the inward turning of the connecting plate 21 needs to drive the locking member 23 in structure, and the inward turning of the connecting plate 21 can be limited by the abutment of the sleeve 31 on the locking member 23, so at this time, the sleeve 31 can lock the connecting plate 21 in a fully expanded state.

[0048] Furthermore, when the connecting plate 21 is in a state perpendicular to the axial direction of the connecting portion 2 , the end of the locking member 23 close to the first end of the connecting plate 21 abuts against the outer wall of the mounting portion 1 .

[0049] Specifically, as shown in the attached figure Figure 2 As shown, the locking member 23 is further designed so that after the connecting plate 21 is turned outward, the end of the locking member 23 can abut against the outer wall of the mounting portion 1, thereby also limiting the further turning outward of the connecting plate 21. Figure 1 In the retracted state shown in FIG. 1 , in the axial direction of the connecting portion 2, the outermost edge of the hinge structure between the connecting plate 21 and the mounting portion 1 on the side close to the connecting plate 21 needs to be in the same target position as the end of the locking member 23 (see FIG. Figure 1 ), so that when the connecting plate 21 is in a state perpendicular to the axial direction of the connecting portion 2, the end of the locking member 23 can just abut against the outer wall of the mounting portion 1.

[0050] In one embodiment, a positioning step (not shown in the drawings) is configured on the outer wall of the mounting portion 1 , the sleeve 31 is located between the positioning step and the connecting portion 2 , and a spring 4 is disposed between one end of the sleeve 31 and the positioning step.

[0051] Specifically, based on the use of the sleeve 31 and the locking member 23 to lock the state of the connecting plate 21, it is necessary to achieve reliability of the cooperation between the sleeve 31 and the locking member 23, and this embodiment uses the spring 4 to achieve this. Figure 5 As shown, the elastic force applied by the spring 4 to the sleeve 31 enables the sleeve 31 to be stably stuck in the bayonet 24 when the connecting plate 21 is folded, and enables the sleeve 31 to apply a sufficiently large force to the locking member 23 when the connecting plate 21 is unfolded, thereby ensuring the reliability of the limiting function. The spring 4 can be a cylindrical spring 4 or a prismatic spring 4 according to the outer shapes of the mounting portion 1 and the connecting portion 2.

[0052] In one embodiment, the mounting portion 1 is cylindrical in shape, the sleeve 31 is a cylinder threadedly matched with the outer wall of the mounting portion 1, and the plurality of bayonet holes 24 corresponding to the plurality of locking members 23 are located on the circumference of the same circle.

[0053] Specifically, in this embodiment, threaded matching is used to achieve the reliability of the matching between the sleeve 31 and the locking member 23, that is, based on the cylindrical structure design of the mounting portion 1, internal threads and external threads are respectively processed on the inner wall of the sleeve 31 and the outer wall of the first end of the mounting portion 1, and the movement of the sleeve 31 along the circumference of the connecting portion 2 needs to be achieved by rotation, so the reliability of the limiting function can also be guaranteed. At this time, it is necessary to ensure that the multiple bayonet holes 24 are located on the circumference of the same circle, which is a concentric circle of the outer contour circle of the cylindrical mounting portion 1.

[0054] Furthermore, when the mounting portion 1 is cylindrical in shape, the connecting portion 2 is coaxial with the mounting portion 1 and has the same outer diameter as the cylindrical structure, or the connecting portion 2 is coaxial with the mounting portion 1 but has a smaller outer diameter as the cylindrical or non-cylindrical structure.

[0055] Specifically, since the mounting portion 1 and the sleeve 31 are matched with each other using a threaded structure, and the sleeve 31 needs to cross the mounting portion 1 and the connecting portion 2 during movement, the connecting portion 2 cannot affect the movement and rotation of the sleeve 31. When the outer shape structure of the connecting portion 2 is not restricted, the radial dimension of the connecting portion 2 needs to be smaller than that of the mounting portion 1; if the connecting portion 2 is constructed as a cylindrical structure, its outer diameter can be consistent with that of the mounting portion 1.

[0056] In one embodiment, the connecting plate 21 is a flat plate structure and a plurality of connecting plates 21 constitute a connecting portion 2 of a square cylindrical structure; or, the connecting plate 21 is an arc-shaped plate structure and a plurality of connecting plates 21 constitute a connecting portion 2 of a cylindrical structure; wherein, for the connecting plate 21 of the arc-shaped plate structure, in a cross section perpendicular to the axis of the connecting portion 2, the connecting plate 21 is completely within the area between the inner and outer surfaces of the magnetic block 22.

[0057] Specifically, as shown in the attached figure Figure 3 and Figure 4 As shown, since the connecting part 2 mainly relies on the magnetic block 22 to absorb the corresponding plane, the shape structure of the connecting plate 21 itself can be adjusted as needed, that is, the connecting plate 21 can be a flat plate or an arc-shaped plate. It only needs to ensure that the outer surface and the inner surface of the magnetic block 22 are flat and relatively protrude from any position of the connecting plate 21.

[0058] In the description of the present invention, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "back", "inside", "outside", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0059] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments, and other arrangements may be designed without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the features described in the various dependent claims and herein may be combined in a manner different from that described in the original claims. It may also be understood that the features described in conjunction with the individual embodiments may be used in other described embodiments.

Claims

1. A portable fixing device, characterized in that: include: A mounting portion, which is used to mount the object to be fixed; The connecting portion is configured as a cylindrical structure and is composed of a plurality of connecting plates distributed along the circumferential direction, wherein the connecting plate is configured as a strip structure extending along the axial direction of the connecting portion and a first end of the connecting plate is hinged to the first end of the mounting portion, and the connecting plate can be turned over in the plane where the axis of the connecting portion is located; and A locking assembly, used for locking the flipped state of the connecting plate, so that the connecting plate is fixed relative to the mounting portion when flipped to be parallel or perpendicular to the axial direction of the connecting portion; Wherein, a plurality of magnetic blocks are embedded on the connecting plate, and the inner and outer surfaces of the magnetic blocks protrude from the inner and outer surfaces of the connecting plate respectively.

2. The portable fixing device according to claim 1, characterized in that: The locking assembly comprises a sleeve sleeved at the connection between the mounting portion and the connecting portion, the connecting plate is configured with a locking piece protruding from the outer wall thereof near the first end thereof, the locking piece is bent toward the side where the mounting portion is located and is spaced from the outer wall of the connecting portion; Wherein, when the connecting plate is in a state parallel to the axial direction of the connecting portion, the sleeve can be partially inserted into the bayonet formed between the locking member and the outer wall of the connecting portion by moving along the axial direction of the connecting portion, and the sleeve now spans the mounting portion and the connecting portion; When the connecting plate is in a state perpendicular to the axial direction of the connecting portion, the sleeve can abut against the locking member, and the sleeve is now sleeved outside the mounting portion.

3. The portable fixing device according to claim 2, characterized in that: When the connecting plate is in a state perpendicular to the axial direction of the connecting portion, an end of the locking member close to the first end of the connecting plate abuts against an outer wall of the mounting portion.

4. The portable fixing device according to claim 2, characterized in that: A positioning step is configured on the outer wall of the mounting portion, the sleeve is located between the positioning step and the connecting portion, and a spring is disposed between one end of the sleeve and the positioning step.

5. The portable fixing device according to claim 2, characterized in that: The mounting portion is cylindrical in shape, the sleeve is a cylinder threadably matched with the outer wall of the mounting portion, and the plurality of bayonet holes corresponding to the plurality of locking members are located on the circumference of the same circle.

6. The portable fixing device according to claim 5, characterized in that: When the mounting portion is cylindrical in shape, the connecting portion is coaxial with the mounting portion and has the same outer diameter as the connecting portion, or the connecting portion is coaxial with the mounting portion but has a smaller outer diameter as the cylindrical or non-cylindrical structure.

7. The portable fixing device according to any one of claims 1 to 6, characterized in that: The mounting portion is configured as a cylindrical structure capable of at least partially accommodating an object to be fixed, and a partition is disposed inside the mounting portion near a first end thereof, wherein a through hole is formed on the partition.

8. The portable fixing device according to claim 7, characterized in that: Bolts are passed through the cylinder of the mounting portion, and the bolts are used to tighten the portion of the object to be fixed contained in the mounting portion.

9. The portable fixing device according to any one of claims 1 to 6, characterized in that: The plurality of magnetic blocks are evenly spaced and distributed along the length direction of the connecting plate, and the inner and outer side surfaces of all the magnetic blocks on one connecting plate are flush with each other.

10. The portable fixing device according to any one of claims 1 to 6, characterized in that: The connecting plate is a flat plate structure and a plurality of the connecting plates form the connecting portion of a square tube structure; or, the connecting plate is an arc-shaped plate structure and a plurality of the connecting plates form the connecting portion of a cylindrical structure; Wherein, for the connecting plate of the arc-shaped plate structure, in a cross section perpendicular to the axis of the connecting portion, the connecting plate is completely located in the area between the inner and outer surfaces of the magnetic attraction block.

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