Inner ring hidden type pre-tightening hoop device and modularly-assembled broom

Abstract

According to the pre-tightening hoop device with the hidden inner ring and the modularly-assembled broom, through the design that the outlet end of the adjusting clamping groove is connected with the inner ring of the belt body or the adjusting clamping groove and an inner ring inserting groove are designed, the redundant belt body can be completely hidden in the inner ring of the hoop, and the exposed part is prevented from scraping and touching an object or a human body; the tool is particularly suitable for handheld tools; the deformable belt supports large-range length adjustment, and can adapt to objects with different diameters without cutting through meshing transmission of the tooth groove and the external thread part.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical fastening devices, and specifically to an inner-ring hidden pre-tightening hoop device and a modularly assembled broom, which are particularly suitable for fastening scenarios that require adjustability, strong versatility, and a simple appearance, such as bamboo brooms, multi-pipe connections, multi-cable bundling, etc. Background Art

[0002] Traditional hoop devices, such as metal steel hoops and plastic ties, when surrounding and fastening an object, usually adopt a locking structure where one end is fixed and the other end surrounds multiple target objects and then inserts into one end for connection. During the pre-tightening process, the other end extends from the outer ring until multiple target objects are fixed together.

[0003] However, such devices have the following defects:

[0004] 1. Difficulty in storing the extended end

[0005] When the length of the hoop exceeds the circumference of the fastened object, the extra extended part is exposed on the outer ring, and it is easy to scrape against surrounding objects or the human body due to shaking (for example, scraping against the ground or the user's leg when using a broom), posing a safety hazard and affecting the appearance.

[0006] 2. Poor adaptability of rigid materials

[0007] Metal steel hoops need to be precisely cut according to the circumference of the object. If cut too short, they cannot be used; if too long, additional tools are required for trimming, which is cumbersome and has low versatility.

[0008] 3. Insufficient strength of flexible materials

[0009] Of course, as an alternative solution, users can choose to use existing plastic ties, but their flexible materials have insufficient strength. Although plastic ties can be cut, they cannot be adjusted repeatedly, and their tensile strength is low, and they are prone to aging and breaking after long-term use.

[0010] In the prior art, to solve the above problems, some solutions select the appropriate length of the steel hoop belt by measuring the approximate diameter of multiple target objects, but their adjustment range is limited, adding the step of measurement, and there is still a risk of scratching at the exposed end of the steel hoop. Therefore, there is an urgent need for a hoop device that can hide the extra part and achieve quick adjustment and high versatility. Summary of the Invention

[0011] The embodiments of the present application provide an inner-ring hidden pre-tightening hoop device and a modularly assembled broom. Among them, by adjusting the connection of the outlet end of the slot to the inner ring of the belt body or through the design of the slot and the inner-ring slot, the excess belt body can be completely hidden inside the hoop, avoiding scratching objects or the human body by the exposed part, especially suitable for hand-held tools; the deformable belt supports a large range of length adjustment, and through the meshing transmission of the tooth grooves and the external thread part, it can adapt to objects of different diameters without cutting.

[0012] An inner-ring hidden pre-tightening hoop device according to an embodiment of the present application includes:

[0013] A deformable belt, including a belt body and a plurality of tooth grooves uniformly arranged on the belt body;

[0014] A pre-tightening connection shell, which is hollow inside and is connected to one end of the belt body;

[0015] A fastener, with an external thread part adapted to the tooth grooves arranged on its outer periphery. The fastener is arranged inside the pre-tightening connection shell, and both ends of the fastener are rotatably connected to the pre-tightening connection shell respectively, and one end extends out of the pre-tightening connection shell;

[0016] A through adjustment slot is arranged at the bottom of the pre-tightening connection shell. The other end of the belt body can be bent under an external force and inserted into the adjustment slot, and is slidably connected to the adjustment slot, and the tooth grooves are meshed with the external thread part; the external thread part can be rotated under an external force and drive the tooth grooves to move axially along the external thread part;

[0017] The outlet end of the adjustment slot is arranged at the bottom of one end of the belt body, so that the other end of the belt body can contract along the inner ring of the belt body; or

[0018] A slot for the other end of the belt body to be inserted into the inner ring after bending is arranged at one end of the belt body. The outlet end of the adjustment slot is arranged at the top of one end of the belt body, so that after the other end of the belt body extends out of the outlet end of the adjustment slot, it can be inserted into the inner ring along the outer ring of the belt body through the slot.

[0019] Further, as a more preferred implementation of the present invention, the deformable belt includes at least a pair of folding ears arranged on both sides of one end of the belt body, and the at least a pair of folding ears are arranged towards the inner ring after the belt body is bent; a gap through which the other end of the belt body can pass can be formed between the folding ears on both sides of the belt body.

[0020] Further, as a more preferred implementation of the present invention, the included angle between the folding ear and the belt body is 60° - 90°.

[0021] Furthermore, as a more preferred embodiment of the present invention, the thickness of the folded ear portion is 1 to 20 mm, and the length of the gap between adjacent folded ear portions on the same side is 1 to 20 mm.

[0022] Further, as a more preferred embodiment of the present invention, a limit groove is provided on the end surface of one end of the fastener, and the limit groove is used for inserting a screwdriver bit to rotate by leveraging force; or

[0023] One end of the fastener is fixedly connected with a rotating handle, and the rotating handle is used for a user to hold and rotate the fastener.

[0024] Furthermore, as a more preferred embodiment of the present invention, a notch connected to the interior is provided at the bottom of the pre-tightening connection shell, and slide rail parts are respectively provided on both sides of the notch, and the adjustment slot is formed between the slide rail parts, and at least a part of the outer periphery of the external thread part extends between the two slide rail parts, and the belt body can be inserted between the two slide rail parts and clamp the tooth groove to engage with the external thread part.

[0025] Based on the same inventive concept, this embodiment also provides a modular assembled broom, which can integrate the clamp device into a modular broom or other tool, and achieve quick replacement and maintenance through the plug-in connection between the flexible sleeve and the gripping rod, thereby reducing the cost of wholesale and retail transportation, and providing the convenience of flexible replacement after a single unit is damaged. These include:

[0026] A plurality of shaft branch connecting members, one end of which is provided with at least one thin branch portion, wherein the at least one thin branch portion is used to sweep the ground target;

[0027] A flexible sleeve, the other ends of the plurality of shaft-branch connectors are respectively arranged around the flexible sleeve;

[0028] A holding rod, one end of which can be inserted into and removed from the flexible sleeve;

[0029] At least one inner ring hidden pre-tightening clamp device as described above can surround the outer circumference of multiple shaft branch connectors and fasten the multiple shaft branch connectors and the flexible sleeve to one end of the holding rod.

[0030] Furthermore, as a more preferred embodiment of the present invention, the flexible sleeve includes a tube body, and the tube wall of the tube body is corrugated.

[0031] Furthermore, as a more preferred embodiment of the present invention, the flexible sleeve further comprises a spiral skeleton, and the spiral skeleton is integrally formed on the inner wall of the tube body.

[0032] Furthermore, as a more preferred embodiment of the present invention, the flexible sleeve also includes a rubber protrusion or a rubber ring arranged on the inner wall of the tube body. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments.

[0034] Figure 1 It is a schematic diagram of the overall structure when the inner-ring hidden pre-tightening hoop device in this embodiment is in use.

[0035] Figure 2 It is a schematic diagram of the overall structure when another inner-ring hidden pre-tightening hoop device in this embodiment is in use.

[0036] Figure 3 It is a schematic diagram of the overall structure when the inner-ring hidden pre-tightening hoop device in this embodiment is not in use.

[0037] Figure 4 It is another schematic diagram of the overall structure when the inner-ring hidden pre-tightening hoop device in this embodiment is not in use.

[0038] Figure 5 It is a schematic diagram of the structure with folding ears provided on both sides of the belt body in this embodiment.

[0039] Figure 6 It is another schematic diagram of the structure with folding ears provided on both sides of the belt body in this embodiment.

[0040] Figure 7 It is a schematic diagram of another structure with folding ears provided on both sides of the belt body in this embodiment.

[0041] Figure 8 It is a schematic diagram of the structure of an inner-ring hidden pre-tightening hoop device with folding ears in this embodiment.

[0042] Figure 9 It is another schematic diagram of the structure of an inner-ring hidden pre-tightening hoop device with folding ears in this embodiment.

[0043] Figure 10 It is a schematic diagram of another structure of an inner-ring hidden pre-tightening hoop device with folding ears in this embodiment.

[0044] Figure 11 It is a schematic diagram of the structure of a modularly assembled broom in this embodiment.

[0045] Figure 12 It is an unfolded schematic diagram of the structure of a modularly assembled broom in this embodiment.

[0046] Figure 13 It is a schematic diagram of the half-section structure after assembly of a modularly assembled broom in this embodiment.

[0047] Reference Signs:

[0048] 1 - deformable belt, 11 - belt body, 111 - slot, 12 - tooth groove, 13 - folding ear part.

[0049] 2 - pre - tightening connection shell, 21 - adjustment card slot, 22 - notch, 23 - slide rail part.

[0050] 3 - fastener, 31 - external thread part, 32 - limit groove, 33 - rotating handle.

[0051] 100 - inner - ring hidden pre - tightening hoop device.

[0052] 200 - modularly assembled broom, 210 - shaft - branch connecting piece, 211 - thin - branch part, 220 - flexible sleeve, 221 - pipe body, 222 - spiral skeleton, 223 - rubber ring, 230 - holding rod, 231 - sharp part.

[0053] a - inlet end, b - outlet end. Detailed implementation manners

[0054] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of this application.

[0055] It should be noted that when an element is referred to as "fixed to" or "disposed on" another component, it can be directly on the other component or indirectly disposed on the other component; when a component is referred to as "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component.

[0056] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to this application.

[0057] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, the meaning of "a plurality of" and "several" is two or more, unless otherwise specifically defined.

[0058] It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in this technology to understand and read, and are not used to limit the implementable conditions of this application. Therefore, they do not have substantial technical significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the efficacy that this application can produce and the purpose that can be achieved, should still fall within the scope that the technical content disclosed in this application can cover.

[0059] Embodiment

[0060] This embodiment aims to facilitate the solution of the problems in the prior art that when the traditional hoop device surrounds and fastens an object, the extension end is difficult to store and the adaptability to rigid materials is poor. For this purpose, an inner-ring hidden pre-tightening hoop device 100 and a modularly assembled broom are proposed. Among them, by adjusting the outlet end b of the card slot 21 to connect the inner ring of the belt body 11 or through the design of the card slot 21 and the inner-ring slot 111, the redundant belt body 11 can be completely hidden in the inner ring of the hoop, avoiding the exposed part from scratching the object or the human body, especially suitable for hand-held tools; the deformable belt 1 supports a large range of length adjustment, and through the meshing transmission of the tooth grooves 12 and the external thread part 31, it can adapt to objects of different diameters without cutting.

[0061] Refer to Figures 1-4 As shown, an inner-ring hidden pre-tightening hoop device 100 includes a deformable belt 1, a pre-tightening connection shell 2, and a fastener 3.

[0062] Among them, the deformable belt 1 includes a belt body 11 and a plurality of tooth grooves 12 evenly arranged on the belt body 11. Exemplarily, the belt body 11 can be a metal part made of stainless steel, the tooth grooves 12 are rectangular, evenly arranged along the length direction of the belt body 11, the distance between adjacent tooth grooves 12 is 2 - 10 mm, and the depth is 1 - 3 mm. In some embodiments, the tooth grooves 12 are obliquely arranged, that is, the inner wall of the tooth grooves 12 has a guiding inclined surface, which is convenient for better meshing with the external thread part 31 and guiding the movement of the belt body 11.

[0063] Among them, the inside of the pre-tightening connection shell 2 is hollow and is connected to one end of the belt body 11.

[0064] Among them, an external thread portion 31 adapted to the tooth groove 12 is provided on the outer periphery of the fastener 3. The fastener 3 is disposed inside the pre-tightening connection housing 2. Both ends of the fastener 3 are rotatably connected to the pre-tightening connection housing 2 respectively, and one end extends out of the pre-tightening connection housing 2. Exemplarily, both sides of the pre-tightening connection housing 2 are rotatably connected to the pre-tightening connection housing 2 through shaft hole fitting. The end extending out of the pre-tightening connection housing 2 is processed into a hexagon head or a cross recess, which is adapted to standard tools such as wrenches and screwdrivers.

[0065] Among them, a through adjustment card slot 21 is provided at the bottom of the pre-tightening connection housing 2. The other end of the belt body 11 can be bent under an external force and inserted into the adjustment card slot 21, and is slidably connected to the adjustment card slot 21, and the tooth groove 12 meshes with the external thread portion 31; the external thread portion 31 can be rotated under an external force and drive the tooth groove 12 to axially drive along the external thread portion 31; Exemplarily, the material of the pre-tightening connection housing 2 is made of stainless steel or aluminum alloy. The size of the internal hollow cavity is slightly larger than the outer diameter of the fastener 3. It should be added that the slot width of the adjustment card slot 21 is slightly larger than the thickness of the belt body 11. Exemplarily, when the belt body 11 is 1 mm thick, the slot width is 1.2 mm. In some embodiments, a guiding chamfer is provided at the inlet end a of the adjustment card slot 21, and the angle can be 30°-45°, which is convenient for the belt body 11 to be inserted.

[0066] It should be added that the external thread portion 31 is a single-start or double-start thread, and the pitch is the same as the pitch of the tooth groove 12. Exemplarily, for example, when the pitch of the tooth groove 12 is 5 mm, the pitch is 5 mm, ensuring that the belt body 11 moves one tooth pitch for each rotation. The thread profile angle is 60°, which matches the guiding inclined surface of the tooth groove 12 to reduce meshing friction. Example steps of transmission: Step 1: Bend the other end of the belt body 11 and insert it into the adjustment card slot 21 so that the last tooth groove 12 is initially meshed with the external thread portion 31. Step 2: Rotate the fastener 3 clockwise, and the external thread portion 31 pushes the tooth groove 12 to move towards the pre-tightening connection housing 2, and the belt body 11 contracts along the inner circle, and the excess part is hidden inside the inner circle. Step 3: Rotate counterclockwise to loosen, and the belt body 11 can be withdrawn from the adjustment card slot 21 in the reverse direction to achieve quick disassembly.

[0067] Refer to Figure 2 As shown, in some embodiments, the outlet end b of the adjustment card slot 21 is disposed at the bottom of one end of the belt body 11 so that the other end of the belt body 11 can contract along the inner circle of the belt body 11. After the belt body 11 is inserted, it bends along the inner circle, and the excess part is naturally stacked under the inner circle.

[0068] Refer to Figure 1 、 3As shown in FIG. 4 , in some embodiments, one end of the belt body 11 is provided with a slot 111 for inserting the other end of the belt body 11 into the inner ring after bending, and the outlet end b of the adjustment slot 21 is arranged at the top of one end of the belt body 11, so that the other end of the belt body 11 can be inserted into the inner ring through the slot 111 along the outer ring of the belt body 11 after extending from the outlet end b of the adjustment slot 21. It should be noted that after the belt body 11 passes through the top of the adjustment slot 21, it is bent along the outer ring by external force and inserted into the inner ring through the slot 111, forming a ring lock. It is particularly suitable for scenes where tensile strength needs to be enhanced, such as cable binding.

[0069] Reference Figures 5-10 As shown, in some embodiments, the deformable belt 1 includes at least one pair of folded ear portions 13 arranged on both sides of one end of the belt body 11, and at least one pair of folded ear portions 13 are arranged toward the inner circle after the belt body 11 is bent; a gap can be formed between the folded ear portions 13 on both sides of the belt body 11 for the other end of the belt body 11 to pass through. It should be supplemented that the folded ear portions 13 and the belt body 11 are integrally formed. In the initial state, the folded ear portions 13 and the belt body 11 are located in the same plane, and the folded ear portions 13 are bent to a specified angle through a bending process. The width of the folded ear portions 13 is consistent with the width of the belt body 11, and the edges and ends are rounded. It should be supplemented that the folded ear portions 13 also have a bite-limiting function. When in the locked state, the greater the stress received by the folded ear portions 13, the greater the friction between the folded ear portions 13 and the hooped object, and the overall rotation is not easy to occur.

[0070] Furthermore, the angle between the folded ear portion 13 and the belt body 11 is 60° to 90°. The thickness of the folded ear portion 13 includes 1 to 20 mm, and the gap length between adjacent folded ear portions 13 on the same side includes 1 to 20 mm. When the folded ear portions 13 are densely distributed, such as the spacing is ≤5 mm, it is suitable for small diameter objects; sparsely distributed, such as the spacing is ≥10 mm, it is suitable for large diameter objects.

[0071] Reference Figure 6 As shown, it should be noted that the folded ear portion 13 is bent toward the inner circle of the belt body 11 to form a "guide channel" to ensure that the other end of the belt body 11 can move along the inner circle guide fixed path when passing through the gap.

[0072] Reference Figure 7 As shown, in some embodiments, a limiting groove 32 is provided on the end surface of one end of the fastener 3, and the limiting groove 32 is used for the screwdriver bit to be inserted and rotated by force. Exemplarily, the limiting groove 32 can be a cross groove, a slotted groove, a hexagonal groove or a plum blossom groove. The limiting groove 32 is provided with a guide cone angle to facilitate the quick alignment and insertion of the bit.

[0073] Reference Figure 1As shown, in some embodiments, one end of the fastener 3 is fixedly connected with a rotating handle 33, and the rotating handle 33 is used for a user to hold and rotate the fastener 3. The handle can be circular, straight rod-shaped, L-shaped or T-shaped. The handle and the fastener 3 can be fixed by welding or integrally formed.

[0074] Referring to Figure 10 As shown, in some embodiments, a notch 22 communicating with the inside is provided at the bottom of the pre-tightening connection shell 2. Slide rail parts 23 are respectively arranged at the bottom of both sides of the notch 22, and an adjustment clamping groove 21 is formed between the slide rail parts 23. At least a part of the outer circumference of the external thread part 31 extends between the two slide rail parts 23, and the belt body 11 can be inserted between the two slide rail parts 23 and the tooth groove 12 is clamped to mesh with the external thread part 31. Exemplarily, the slide rail part 23 can be L-shaped or U-shaped, and its inner surface is smooth to reduce the frictional resistance when the belt body 11 is inserted.

[0075] Exemplarily, the width of the adjustment clamping groove 21 is 0.1 - 0.3 mm larger than the thickness of the belt body 11. For example, when the belt body 11 is 1 mm thick, the groove width is 1.1 - 1.3 mm, allowing the belt body 11 to slide smoothly without shaking. In some embodiments, a flared angle is provided at the entrance of the notch 22, and the angle is 45° - 60°, which is convenient for the initial insertion of the belt body 11.

[0076] Traditional brooms usually adopt an integral structure, and bamboo branches or plastic branches are directly fixed to the end of the holding rod. After the broom branches are unfolded, they occupy a large space and are difficult to be densely packed in boxes, resulting in high transportation costs and being easily damaged due to extrusion. When some branches are damaged, the whole needs to be replaced, causing waste of resources. The fixing method of the holding rod and the broom branches is single and cannot adapt to rod bodies of different lengths or diameters. For this reason, referring to Figures 11-13 As shown, this embodiment also provides a modularly assembled broom 200, including: a plurality of shaft branch connectors 210, a flexible sleeve 220 and an inner ring hidden pre-tightening hoop device 100. Among them, the modularly assembled broom in this embodiment adopts a split design, and the shaft branch connector and the flexible sleeve are fastened into an independent module through the inner ring hidden pre-tightening hoop device, and the holding rod can be inserted and pulled out of the flexible sleeve. This design significantly improves the transportation and storage efficiency: the shaft branch connector and the flexible sleeve are fixed into a compact unit through the hoop device, and the holding rod is transported separately, greatly reducing the overall volume, increasing the packing stacking density and reducing the logistics cost. The corrugated pipe body and the spiral skeleton design of the flexible sleeve can buffer external force impacts during transportation and avoid the thin branch part of the shaft branch connector from being deformed or broken due to extrusion. The user only needs to insert the holding rod into the flexible sleeve and lock the hoop device to complete the assembly, without the need for professional tools or complex operations, and damaged parts can also be quickly replaced during maintenance.

[0077] Referring to Figures 11-12As shown, one end of a plurality of shaft and branch connectors 210 is provided with at least one thin branch portion 211, and the at least one thin branch portion 211 is used for sweeping and poking ground targets; the targets include leaves, garbage, and particulate matters on the ground, etc. Exemplarily, the material of the thin branch portion 211 can be natural bamboo branches, plastic bionic branches, nylon filament bundles, etc. It should be noted that the miscellaneous branches on the surface of the bamboo branches can be shaved off. The shaft and branch connector 210 can be a thin bamboo pole, and the thin branches and branches and leaves of the bamboo pole are retained as the thin branch portion 211, and its surface is polished.

[0078] Refer to Figure 12 As shown, the other ends of the plurality of shaft and branch connectors 210 are respectively arranged around the flexible sleeve.

[0079] Refer to Figure 12 As shown, one end of the holding rod 230 is pluggable into the flexible sleeve 220.

[0080] Refer to Figure 12 As shown, the above-mentioned inner ring hidden pre-tightening hoop device 100 can surround the outer periphery of the plurality of shaft and branch connectors 210 and fasten the plurality of shaft and branch connectors 210 and the flexible sleeve 220 to one end of the holding rod 230.

[0081] Refer to Figures 11-13 As shown, taking a bamboo broom as an example, its assembly steps are as follows:

[0082] Arrange the plurality of shaft and branch connectors 210 around the flexible sleeve 220;

[0083] Surround the outer periphery of the shaft and branch connectors 210 with two hoop devices, insert the belt body 11 into the adjustment slot 21 and engage with the external thread portion 31;

[0084] Use a screwdriver or rotate the handle 33 to rotate the fastener 3, drive the belt body 11 to contract until the shaft and branch connector 210 and the flexible sleeve 220 are in mutual contact; the excess belt body 11 is completely hidden inside the inner ring and there is no exposed part;

[0085] Insert the holding rod 230 into the sleeve, use a screwdriver or rotate the handle 33 to rotate the fastener 3, and completely lock the shaft and branch connector 210, the flexible sleeve 220 and the holding rod 230 into a whole, and wave the holding rod 230 to drive the whole broom to sweep and poke the target.

[0086] When disassembly and maintenance are required, rotate the fastener 3 in the reverse direction and pull out the belt body 11 to replace or adjust the shaft and branch connector 210 or the holding rod 230.

[0087] When sub-packaging and transportation are required, the shaft branch connector 210 and the flexible sleeve 220 bundled by the hoop device are transported as a whole, and the holding rod 230 is transported as a single entity, which are respectively bagged or boxed. The stacking density is higher, and more can be loaded in the same volume, reducing the transportation and logistics costs. Moreover, after the user receives the goods, the holding rod 230 can be inserted into the flexible sleeve 220, and multiple hoop devices are locked to be used.

[0088] Referring to Figure 13 As shown, in some embodiments, the flexible sleeve 220 includes a tube body 221, and the tube wall of the tube body 221 is corrugated. Exemplarily, the flexible sleeve 220 can be a corrugated tube, and the corrugations of the tube body 221 are composed of alternating convex rings and concave rings, and the outer diameter of the convex ring is 3-5 mm larger than that of the concave ring to achieve radial elastic clamping after the holding rod is inserted.

[0089] Referring to Figure 13 As shown, in some embodiments, the flexible sleeve 220 further includes a spiral skeleton 222, and the spiral skeleton 222 is integrally formed on the inner wall of the tube body 221. Exemplarily, the spiral skeleton 222 can be a metal spring, and the spiral skeleton 222 is a spring wire with a diameter of 1-2 mm embedded in the inner wall of the tube body 221. Among them, the spiral skeleton 222 can improve the support performance of the tube body 221, and when multiple shaft branch connectors 210 are pre-wound around the outer periphery of the tube body 221, they can be well fixed by the hoop, avoiding deformation and inward concavity, and can also ensure that the radial elastic clamping after the holding rod is inserted is not affected.

[0090] Referring to Figure 13 As shown, it should be added that the inner-ring hidden pre-tightening hoop device 100 surrounds the shaft branch connector 210, and the shaft branch connector 210 is arranged around the tube body 221; when the fastener 3 rotates, the inner ring of the deformable belt 1 contracts, forcing the shaft branch connector 210 to gather towards the center of the sleeve, and at the same time the flexible sleeve 220 is radially compressed and contracts to clamp the holding rod.

[0091] Referring to Figure 13 As shown, in some embodiments, the flexible sleeve 220 further includes rubber protrusions or rubber rings 223 provided on the inner wall of the tube body 221, which can enhance the anti-detachment property of the holding rod and further increase the friction between the holding rod and the inner wall of the flexible sleeve 220 to prevent relative rotation.

[0092] Referring to Figure 13As shown, in some embodiments, the end of the holding rod is sharpened to facilitate insertion into the flexible sleeve 220. In the case where the flexible sleeve 220 is flattened or concave, the concave part of the flexible sleeve 220 can be lifted by guiding with the sharp part 231 of the holding rod. In some embodiments, the sharp part 231 of the holding rod penetrates through the entire flexible sleeve 220 and is inserted into the dense intersection of the thin branch parts 211 of the shaft branch connector 210, increasing the relative clamping position between the holding rod and the shaft branch connector 210 and preventing relative rotation.

[0093] The structural solutions provided in the embodiments of the present application have been introduced in detail above. Specific examples are used herein to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the present application. At the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. An inner ring hidden pre-tightening clamp device, characterized in that: include: A deformable belt, comprising a belt body and a plurality of tooth grooves evenly arranged on the belt body; A pre-tightening connection shell, which is hollow inside and connected to one end of the belt body; A fastener, the outer circumference of which is provided with an external threaded portion adapted to the tooth groove, the fastener is arranged inside the pre-tightening connection shell, the two ends of the fastener are rotatably connected to the pre-tightening connection shell respectively, and one end extends out of the pre-tightening connection shell; The bottom of the pre-tightening connection shell is provided with a penetrating adjustment slot, the other end of the belt body can be bent under the action of external force and inserted into the adjustment slot, and is slidably connected with the adjustment slot, and the tooth groove is meshed with the external threaded portion; the external threaded portion can rotate under the action of external force, and drive the tooth groove to transmit along the axial direction of the external threaded portion; The outlet end of the adjusting slot is located at the bottom of one end of the belt body, so that the other end of the belt body can shrink along the inner circle of the belt body; or One end of the belt body is provided with a slot for the other end of the belt body to be inserted into the inner ring after being bent, and the outlet end of the adjustment slot is arranged at the top of one end of the belt body, so that the other end of the belt body can be inserted into the inner ring through the slot along the outer ring of the belt body after extending from the outlet end of the adjustment slot.

2. The inner ring hidden pre-tightening clamp device according to claim 1, characterized in that: The deformable belt includes at least one pair of folded ears arranged on both sides of one end of the belt body, and the at least one pair of folded ears are arranged toward the inner circle of the belt body after bending; a gap can be formed between the folded ears on both sides of the belt body for the other end of the belt body to pass through.

3. The inner ring hidden pre-tightening clamp device according to claim 2 is characterized in that: The included angle between the folded ear portion and the belt body is 60° to 90°.

4. The inner ring hidden pre-tightening clamp device according to claim 2, characterized in that: The thickness of the folded ear portion is 1 to 20 mm, and the length of the gap between adjacent folded ear portions on the same side is 1 to 20 mm.

5. The inner ring hidden pre-tightening clamp device according to claim 2, characterized in that: The end surface of one end of the fastener is provided with a limiting groove, and the limiting groove is used for inserting a screwdriver bit to rotate by leveraging force; or One end of the fastener is fixedly connected with a rotating handle, and the rotating handle is used for a user to hold and rotate the fastener.

6. The inner ring hidden pre-tightening clamp device according to claim 2, characterized in that: A notch connected to the interior is provided at the bottom of the pre-tightening connection shell, and slide rail parts are respectively provided on both sides of the notch. The adjustment slot is formed between the slide rail parts, and at least a part of the outer circumference of the external thread part extends between the two slide rail parts. The belt body can be inserted between the two slide rail parts and clamp the tooth groove to engage with the external thread part.

7. A modularly assembled broom, characterized in that: include: A plurality of shaft branch connecting members, one end of which is provided with at least one thin branch portion, wherein the at least one thin branch portion is used to sweep the ground target; A flexible sleeve, the other ends of the plurality of shaft-branch connectors are respectively arranged around the flexible sleeve; A holding rod, one end of which can be inserted into and removed from the flexible sleeve; At least one inner ring hidden pre-tightening clamp device as described in any one of claims 1 to 6 can surround the outer circumference of multiple axial branch connectors and fasten the multiple axial branch connectors and the flexible sleeve to one end of the holding rod.

8. The modular assembly broom according to claim 7, characterized in that: The flexible sleeve comprises a tube body, and the tube wall of the tube body is arranged in a corrugated manner.

9. The modular assembly broom according to claim 8, characterized in that: The flexible sleeve further comprises a spiral skeleton, and the spiral skeleton is integrally formed and arranged on the inner wall of the tube body.

10. The modular assembly broom according to claim 8, characterized in that: The flexible sleeve also includes a rubber protrusion or a rubber ring arranged on the inner wall of the tube body.

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