Hand-held rebar tying machine with spool assembly and spool body and adapter

Abstract

The utility model relates to a kind of thread spool assembly for portable reinforcing steel bar binding machine and its thread spool body, adapter.Thread spool assembly for portable reinforcing steel bar binding machine includes thread spool body and adapter, thread spool body has winding drum and first baffle ring, second baffle ring, adapter has end cap portion and plug shaft portion, plug shaft portion is inserted with winding drum, first baffle ring and the opposite side wall of end cap portion are equipped with protruding structure, the inner hole of the winding drum is profiled hole, at least one first rotation-stopping limiting section is present on the profile line of its cross section, at least one second rotation-stopping limiting section is present on the profile line of the lateral wall of plug shaft portion cross section, when plug shaft portion is inserted with the winding drum, the first rotation-stopping limiting section and second rotation-stopping limiting section are adapted to fit to make both rotation-stopping assembly.Guarantee circumferential stop function while effectively reducing the radial dimension of winding drum, so that winding drum can accommodate more turns of iron wire under the same volume.

Description

Technical Field

[0001] This utility model relates to the technical field of rebar tying equipment, and in particular to a spool assembly for a handheld rebar tying machine, as well as its spool body and adapter. Background Technology

[0002] Reinforcing steel bars are a common raw material in construction projects. During construction, it is necessary to bind the connected steel bars, and currently, handheld automatic binding machines are mainly used for automatic binding connections. The spool is a key component of the handheld binding machine. The wire wound on the spool is gradually output under the traction of a motor inside the machine. During the output process, the spool rotates with the motor, thus gradually outputting the wire. Existing spools are of a single-piece structure, mainly consisting of a drive plate, a winding spool, and a brake plate. The drive plate and brake plate are not only structurally complex and difficult to manufacture as a single piece, but also require replacement of the entire spool if any one component fails, resulting in high maintenance costs.

[0003] To address the aforementioned issues, the applicant disclosed a universal spool assembly for a portable rebar tying machine in a prior authorized Chinese utility model patent document with publication number CN220766166U. This assembly features a spool designed as a split structure, comprising a spool body and a spool cover. The spool body has an annular spacer with a limiting groove within it. Correspondingly, the spool cover has a clearance hole at its center, with a positioning boss extending from the clearance hole. The positioning boss and the limiting groove are engaged to achieve circumferential blocking assembly.

[0004] However, this bobbin assembly still has the following problems in actual use: the limiting groove is set within the annular interval, which increases the diameter of the winding cylinder, thereby increasing the overall volume of the bobbin and reducing the number of winding loops. When winding wire onto the bobbin, the overall size becomes larger, making it impossible to wind excessively long wires. Furthermore, the increased overall volume of the bobbin may affect its versatility for use with different types of binding machines. In addition, this method of machining complex limiting structures inside the bobbin results in more complex mold opening and process routes during parts production, increasing costs. Utility Model Content

[0005] The purpose of this utility model is to provide a spool assembly for a handheld rebar tying machine, so as to solve the problems of increased overall spool volume and increased cost caused by complex limiting structure in the prior art; the purpose of this utility model is also to provide a spool body and adapter for the spool assembly.

[0006] To solve the above problems, the spool assembly for the portable rebar tying machine involved in this utility model adopts the following technical solution: A spool assembly for a handheld rebar tying machine includes a spool body and an adapter. The spool body has a winding drum and a first retaining ring and a second retaining ring fixed at both ends of the winding drum. The adapter has an end cap portion and an insert shaft portion coaxially connected to the end cap portion. The insert shaft portion is inserted into the winding drum so that the end cap portion fits against the second retaining ring. The opposite sidewalls of the first retaining ring and the end cap portion are provided with protruding structures. The inner hole of the winding drum is an irregularly shaped hole, and its cross-sectional contour line has at least one first anti-rotation limiting segment. The outer sidewall of the insert shaft portion has at least one second anti-rotation limiting segment. When the insert shaft portion is inserted into the winding drum, the first anti-rotation limiting segment and the second anti-rotation limiting segment are adapted to fit together so that the two are anti-rotationally assembled.

[0007] In a preferred embodiment, both the first anti-rotation limiting segment and the second anti-rotation limiting segment are adapted and fitted planes.

[0008] In a preferred embodiment, the cross-section of the irregular hole is arc-shaped, including an arc segment and a planar segment connecting the arc segment. The planar segment constitutes the first anti-rotation limiting segment. The outer wall of the insert shaft portion has a stepped plane that fits with the planar segment. The stepped plane constitutes the second anti-rotation limiting segment.

[0009] In a preferred embodiment, the middle part of the insert shaft portion has a clearance hole, and the side wall of the insert shaft portion is recessed inwardly with a clearance groove, and the groove wall of the clearance groove has a signal line through hole.

[0010] In a preferred embodiment, a fixing hole is provided on the first anti-rotation limiting section for the wire to pass through.

[0011] In a preferred embodiment, the inner wall of the end cap portion is provided with an axially extending positioning boss, and the outer wall of the second retaining ring is provided with a positioning groove. The two are positioned and inserted into each other to prevent rotation during assembly.

[0012] The bobbin body involved in this utility model adopts the following technical solution: The bobbin body includes a winding drum and a first retaining ring and a second retaining ring fixed at both ends of the winding drum. The winding drum has an inner hole that is irregularly shaped, and its outer contour line has at least one first anti-rotation limiting section for cooperating with the adapter anti-rotation limiting section.

[0013] In a preferred embodiment, the irregular hole is arc-shaped, including an arc segment and a planar segment connecting the arc segment, the planar segment constituting the first anti-rotation limiting segment.

[0014] The adapter involved in this utility model adopts the following technical solution: An adapter includes an end cap portion and a shaft portion, the end cap portion and the shaft portion being coaxially connected. The shaft portion is used to mate with a winding spool so that the end cap portion fits against a second retaining ring of the spool body. The side wall of the end cap portion facing away from the shaft portion has a protruding structure. The adapter is characterized in that the outer side wall of the shaft portion has at least one second anti-rotation limiting segment on the outline of its cross-section. The second anti-rotation limiting segment is used to adapt and fit against a first anti-rotation limiting segment when the shaft portion is mated with the winding spool so that the two are assembled to prevent rotation.

[0015] In a preferred embodiment, the second anti-rotation limiting segment is a stepped plane formed on the outer side wall of the insert shaft portion.

[0016] As described above, this utility model has the following beneficial effects: Compared with the prior art, the spool assembly for the portable rebar tying machine designed in this utility model breaks away from the rigid connection of the traditional integrated spool by using a separate structure for the spool body and the adapter. The detachable structure is formed by the insertion and assembly of the winding drum and the insert shaft, retaining the functional separation of the drive plate and brake plate while reducing the overall structural processing complexity. The anti-rotation limiting section of the irregular hole and the insert shaft adopts an assembly method that matches the outer contour line, effectively reducing the radial dimension of the winding drum while ensuring the circumferential stopping function, allowing the winding drum to accommodate more turns of wire in the same volume. Torque transmission is achieved through contact with the outer contour line, reducing processing depth and mold complexity compared to the traditional internal groove structure. Furthermore, the irregular outer contour structure facilitates standardized production. The structure is simple and highly versatile. At the same time, by adopting this separate arrangement of the adapter and the spool body, a single spool body can be connected to different adapters, ensuring compatibility on different models of machines. Only the adapter needs to be changed, avoiding the waste of raw materials due to machine incompatibility. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly described below: Figure 1 This is a schematic diagram of a specific embodiment of the spool assembly for the portable rebar tying machine of this utility model; Figure 2 for Figure 1 The split state diagram; Figure 3 for Figure 2 A schematic diagram of the structure of the bobbin body in the diagram; Figure 4 for Figure 2 A schematic diagram of the adapter structure.

[0018] Explanation of reference numerals in the attached figures: 1-Spool body; 11-Winding spool; 111-Threading hole; 112-Inner hole; 113-Circular arc segment; 114-Planar segment; 12-First retaining ring; 121-Limiting protrusion; 13-Second retaining ring; 131-Positioning groove; 132-First smooth surface; 2-Adapter; 21-End cap portion; 211-Protruding structure; 212-Positioning boss; 213-Second smooth plane; 22-Insertion shaft section; 221-Stepped plane; 222-Allowing groove; 223-Signal line through hole. Detailed Implementation

[0019] To make the technical objectives, technical solutions, and beneficial effects of this utility model clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model; that is, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown herein can generally be arranged and designed in various different configurations.

[0020] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intervening element. The terms "first," "second," and similar words do not indicate any order, quantity, or importance, but are only used to distinguish different components. The terms "installed," "connected," and "linked" should be interpreted broadly, for example, they can refer to mechanical or electrical connections, or internal connections between two elements, and can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0022] Specific embodiments of the spool assembly for the portable rebar tying machine involved in this utility model are as follows: Figures 1 to 4 As shown, this spool assembly is used in the wire winding component of a rebar tying machine. The spool assembly in this application includes a spool body 1 and an adapter 2, which are coaxially inserted to form a structure similar in function to existing integrated spool structures. This separate insertion method retains the functions of the drive plate and brake plate while reducing the overall structural processing complexity. Of course, in actual use, the spool body 1 can be used alone in the tying machine or in combination with the adapter 2.

[0023] Specifically, the spool body 1 includes a winding drum 11, whose axis extends left and right. The winding drum 11 has a straight cylindrical structure with an inner hole 112. A first retaining ring 12 and a second retaining ring 13 are located on both axial sides of the winding drum 11. The first retaining ring 12 and the second retaining ring 13 facilitate the confinement of the wire within the winding drum 11. Simultaneously, the left surface of the first retaining ring 12 has a limiting protrusion 121, which can be designed as a drive structure or a brake structure, without specific limitations. The right surface of the second retaining ring 13 is a first smooth plane 132. This design is mainly to ensure that the spool body 1, when used alone, fits snugly against the positioning surface of the binding machine, guaranteeing stable and smooth rotation of the spool body 1 and preventing jamming.

[0024] The winding drum 11 has a wire-passing hole 111 on its side wall, through which the end of the iron wire passes from the outside to the inside and is fixed inside the winding drum 11. The specific fixing method is the same as the prior art. After inserting the steel wire from the outside, the winding rod of the binding machine is inserted into the winding drum 11. After the iron wire passes through the end notch of the winding rod, the winding rod is rotated. The iron wire is twisted into a knot in the inner hole 112 as the winding rod rotates, thus fixing the end of the iron wire. Then the winding rod is pulled out and the iron wire is wound around the winding drum 11 one turn at a time.

[0025] The adapter 2 described above has an end cap portion 21 and a shaft portion 22 coaxially connected to the end cap portion 21. The shaft portion 22 is inserted into the winding spool 11 so that the end cap portion 21 fits against the second retaining ring 13. Specifically, the end cap portion 21 has a second smooth plane 213 on its left side wall. After the adapter 2 is inserted into the spool body 1, the first smooth plane 132 and the second smooth plane 213 fit together to achieve a tight coaxial assembly of the two.

[0026] The right side wall of the end cap portion 21 is provided with a protruding structure 211. This protruding structure 211 can be used in conjunction with the braking structure of the binding machine to stop the bobbin body 1, or it can be used in conjunction with the signal detection structure of the binding machine to detect information such as the number of rotations of the bobbin body 1 during the sampling process.

[0027] In addition, the inner hole 112 of the winding drum 11 is an irregular hole, and the outer contour line of its cross-section has at least one first anti-rotation limiting section. The outer contour line of the outer wall of the insertion shaft portion 22 has at least one second anti-rotation limiting section. When the insertion shaft portion 22 is inserted into the winding drum 11, the first anti-rotation limiting section and the second anti-rotation limiting section are adapted to fit together so that the two anti-rotation assembly.

[0028] Specifically, in this application, the irregular hole is used to indicate the non-circular cross-sectional structure of the inner hole 112 of the winding cylinder 11, which can be implemented using a common or polygonal cross-section. The first anti-rotation limiting segment and the second anti-rotation limiting segment transmit torque through the contact between the mating surfaces. The structure of the surface can be designed as a plane, or as a curved surface, a wavy surface, or other irregular surface, without specific limitations.

[0029] The insertion depth of the winding drum 11 and the insertion shaft portion 22 is controlled by the contact surface between the second retaining ring 13 and the end cap, ensuring the axial positioning accuracy of the split assembly. When the second anti-rotation limiting section of the outer wall of the insertion shaft portion 22 is fully or partially in contact with the first anti-rotation limiting section of the inner hole 112 of the winding drum 11, the two form a surface contact torque transmission interface, preventing relative rotation between the winding drum 11 and the adapter 2. The contour design of the irregular hole minimizes the outer diameter while maintaining structural strength, thereby increasing the winding space within the same volume. The contour matching method between the anti-rotation section of the outer wall of the insertion shaft portion 22 and the inner hole 112 of the winding drum 11 eliminates the deep hole machining process required by traditional internal groove structures.

[0030] The outer diameter of the winding spool 11 was reduced, increasing the amount of wire wound within the same volume. Simultaneously, the contour-contact anti-rotation structure simplified the manufacturing process and reduced mold costs. The split design allows for individual replacement of the spool body 1 and adapter 2, reducing maintenance costs. The standardized contour matching method between the irregular hole and the outer wall of the insert spool enhances the adaptability of the spool assembly to different models of binding machines.

[0031] In a preferred embodiment, both the first and second anti-rotation limiting sections are fitted flat surfaces. This is achieved by machining a straight surface into the inner hole 112 of the winding drum 11. This flat surface 114 is used to form a contact surface with the corresponding surface on the adapter 2 to transmit torque. The inner hole 112 of the winding drum 11 forms an irregular hole structure by setting the flat surface 114. The insertion shaft portion 22 of the adapter 2 is correspondingly provided with the flat surface 114. When the insertion shaft portion 22 is inserted into the winding drum 11, the flat surface 114 of the two fit together. The flat contact eliminates the need for complex grooves or protrusions 211 inside the winding drum 11, thereby reducing the radial dimension of the winding drum 11 and allowing for a smaller diameter. The reduced diameter of the winding drum 11 allows the bobbin body 1 to accommodate more coils of wire with the same external dimensions. At the same time, the machining process of the flat structure is simple and can be achieved without complex molds, reducing production costs.

[0032] This effectively avoids the problems of excessively large diameter of the winding drum 11, limited number of winding turns, and high processing costs caused by the complex limiting structure of existing bobbin assemblies, and achieves the effects of reducing bobbin volume, increasing winding amount, and simplifying production process.

[0033] In a preferred embodiment, the inner hole 112 of the winding drum 11 of the bobbin assembly adopts an arc-shaped cross-section structure, which consists of an arc segment 113 and a planar segment 114. The planar segment 114 serves as an anti-rotation limiting surface. The insertion shaft portion 22 of the adapter 2 is provided with a stepped plane 221 that fits against the planar segment 114, forming a planar contact anti-rotation structure. The structure of the inner hole 112 of the bobbin assembly can be achieved by stamping, injection molding, 3D printing, milling, or other methods. The arc-shaped cross-section of the inner hole 112 of the winding drum 11 maintains the cylindrical outer contour of the winding drum 11 through the arc segment 113, ensuring the uniformity of wire winding. The planar segment 114 forms a planar contact with the stepped plane 221 of the insertion shaft portion 22. When the adapter 2 is inserted into the winding drum 11, the stepped plane 221 and the planar segment 114 are completely fitted together, preventing relative rotation between the two. This structure achieves circumferential positioning through planar contact of the outer contour, eliminating the need for additional internal limiting grooves in the winding drum 11, thereby reducing the diameter of the inner hole 112 of the winding drum 11 and decreasing the overall volume. Simultaneously, the straight contour of the planar segment 114 simplifies the mold processing technology, eliminating the need to manufacture complex curved surface forming molds.

[0034] In a preferred embodiment, the insert shaft portion 22 has a clearance hole in the middle, and a clearance groove 222 is recessed inward on the side wall of the insert shaft portion 22. A signal wire through-hole 223 is located on the groove wall of the clearance groove 222. This signal wire through-hole 223 can be implemented using a circular or elliptical hole structure to reduce the material usage of the insert shaft portion 22 and create internal space, preventing the outer diameter of the insert shaft from being too large and forcing an increase in the diameter of the winding tube 11. The coordinated design of the clearance hole and clearance groove 222 allows the insert shaft portion 22 to meet the signal wire routing requirements while effectively controlling its overall radial dimension. The diameter of the inner hole 112 of the winding tube 11 does not need to be increased due to the adapter 2 structure, thereby maintaining a smaller outer diameter of the winding tube 11 to increase the number of winding loops.

[0035] In a preferred embodiment, the inner wall of the end cap portion 21 is provided with an axially extending positioning boss 212, and the outer wall of the second retaining ring 13 is provided with a positioning groove 131. The two are positioned and fitted together to prevent rotation. When the end cap portion 21 and the second retaining ring 13 are in contact, the positioning boss 212 is inserted into the positioning groove 131 axially, forming physical interference. During the rotation of the winding drum 11, the boss and the side wall of the groove contact to generate a circumferential constraint force, preventing relative rotation between the end cap and the winding drum 11. Since the limiting structure is set on the outer contact surface of the end cap and the second retaining ring 13, the inner hole 112 of the winding drum 11 does not need to be provided with an additional limiting groove, so that the diameter of the inner hole 112 of the winding drum 11 can be kept to a minimum, thereby increasing the effective winding space of the winding drum 11 under the same outer diameter conditions.

[0036] The embodiment of the spool body 1 involved in this application has the same structure as the spool body 1 in the embodiment of the spool assembly for the handheld rebar tying machine described above, and will not be described in detail.

[0037] The embodiment of adapter 2 involved in this application has the same structure as the adapter 2 in the embodiment of the spool assembly for the handheld rebar tying machine described above, and will not be described in detail.

[0038] Finally, it should be noted that the above embodiments are only for illustration and not for limiting the technical solutions of this utility model. Any equivalent substitutions and modifications or partial substitutions that do not depart from the spirit and scope of this utility model should be covered within the scope of protection of the claims of this utility model.

Claims

1. A spool assembly for a handheld rebar tying machine, comprising a spool body and an adapter, the spool body having a winding drum and a first retaining ring and a second retaining ring fixed at both ends of the winding drum, the adapter having an end cap portion and a insertion shaft portion coaxially connected to the end cap portion, the insertion shaft portion being inserted into the winding drum such that the end cap portion fits against the second retaining ring, and the opposite sidewalls of the first retaining ring and the end cap portion having protruding structures, characterized in that... The inner hole of the winding drum is an irregularly shaped hole, and its cross-sectional contour line has at least one first anti-rotation limiting section. The outer side wall of the insertion shaft portion has at least one second anti-rotation limiting section on its cross-sectional contour line. When the insertion shaft portion is inserted into the winding drum, the first anti-rotation limiting section and the second anti-rotation limiting section are adapted to fit together so that the two anti-rotation assembly.

2. The spool assembly for a portable rebar tying machine according to claim 1, characterized in that, Both the first anti-rotation limit segment and the second anti-rotation limit segment are adapted and fitted planes.

3. The spool assembly for a handheld rebar tying machine according to claim 2, characterized in that, The cross-section of the irregular hole is arc-shaped, including an arc segment and a planar segment connecting the arc segment. The planar segment constitutes the first anti-rotation limiting segment. The outer wall of the insert shaft portion has a stepped plane that fits with the planar segment. The stepped plane constitutes the second anti-rotation limiting segment.

4. The spool assembly for a portable rebar tying machine according to claim 3, characterized in that, The middle part of the insert shaft has a clearance hole, and the side wall of the insert shaft is recessed inward with a clearance groove. The groove wall of the clearance groove has a signal line through hole.

5. The spool assembly for a handheld rebar tying machine according to claim 1, characterized in that, The first anti-rotation limiting section has a fixing hole for the wire to pass through.

6. The spool assembly for a portable rebar tying machine according to claim 1, characterized in that, The inner wall of the end cap portion is provided with an axially extending positioning boss, and the outer wall of the second retaining ring is provided with a positioning groove. The two are positioned and inserted into each other to prevent rotation assembly.

7. A bobbin body, comprising a winding drum as described in claim 1 and a first retaining ring and a second retaining ring fixed at both ends of the winding drum, characterized in that, The inner hole of the winding spool is an irregularly shaped hole, and its outer contour line has at least one first anti-rotation limiting section for cooperating with the adapter anti-rotation limiting section.

8. The bobbin body according to claim 7, characterized in that, The irregular hole is bow-shaped, including an arc segment and a planar segment connecting the arc segment, and the planar segment constitutes the first anti-rotation limiting segment.

9. An adapter, comprising an end cap portion and a shaft portion as described in claim 1, the end cap portion and the shaft portion being coaxially connected, the shaft portion being used to mate with a winding spool such that the end cap portion fits against a second retaining ring of the spool body, the end cap portion having a protruding structure on its sidewall facing away from the shaft portion, characterized in that, The outer wall of the insert shaft portion has at least one second anti-rotation limiting segment on its cross-sectional profile. The second anti-rotation limiting segment is used to fit and conform to the first anti-rotation limiting segment when the insert shaft portion is inserted into the winding drum so that the two are anti-rotated during assembly.

10. The adapter according to claim 9, characterized in that, The second anti-rotation limiting segment is a stepped plane formed on the outer side wall of the insert shaft portion.

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