An integrated plastic wire spool formed by stepwise injection molding and its molding die

Abstract

The utility model discloses an integrated plastic wire winding disc formed by step-by-step injection molding and a molding die thereof, which comprises an integrated disc body. The integrated disc body includes a first disc body and a second disc body arranged in parallel at intervals. A cylinder body is connected between the first disc body and the second disc body. A wire winding space is formed among the first disc body, the second disc body and the cylinder body. The integrated plastic wire winding disc further includes inner support blocks. There are two inner support blocks, and the inner support blocks are integrally injection molded for the first time. The inner support blocks include a support ring portion, a sector-shaped support portion and an inner support cylinder. The support ring portion is of a circular structure. There are at least two sector-shaped support portions, and the at least two sector-shaped support portions are arranged at intervals along the circumferential direction on the outer side wall of the support ring portion, extend outward in the radial direction, and the width gradually increases from inside to outside. The utility model adopts step-by-step injection molding twice, which not only solves the problems of high assembly cost, low efficiency and mutual position offset of parts, but also effectively reduces the structure of the molding die and the mold opening and closing actions, improves the strength of the injection molded cable disc, eliminates the manual assembly process, and reduces the process cost of the cable disc.

Description

Technical Field

[0001] The utility model relates to the field of winding drum moulds, in particular to an integrated plastic winding drum and a moulding mould thereof which adopts step-by-step injection moulding. Background Art

[0002] Cables are a basic raw material in the fields of electricity, communications, etc. During the production process, the manufactured cables need to be wound on a winding drum and stored and transported by winding. The cable winding drum is a common tool for winding cables. The winding drum is generally made of plastic. In the existing winding drum manufacturing process, injection molding is generally adopted. The winding drum includes an upper drum body and a lower drum body which are spaced apart from each other. A support tube with a cylindrical structure is connected between the upper and lower drum bodies. The upper and lower drum bodies and the external space of the support tube form a winding space for winding cables. The middle part of the support tube is connected from top to bottom.

[0003] The existing winding drum manufacturing process includes an integrated molding process and a separate manufacturing process for accessories. Since a reinforcing component needs to be set inside the cylinder of the winding drum to enhance the load-bearing capacity, the integrated molding process results in a complex mold structure, many mold closing and opening actions, a low injection molding yield, and high injection molding costs; while the process of using separate accessories is to independently manufacture the three accessories of the upper disk body, the lower disk body, and the support cylinder, and then combine the three accessories to form a complete winding drum. This manufacturing method has a complex accessory assembly process, high assembly cost, low assembly efficiency, and the relative position of the accessories is prone to positional displacement during use. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide an integrated winding reel and its mold by step-by-step injection molding of an inner support block and an integrated reel body in response to the deficiencies of the above-mentioned prior art, which not only solves the problems of high assembly cost and low efficiency of spare parts and mutual position offset of accessories, but also effectively reduces the molding mold structure and the opening and closing mold actions, improves the injection molding yield rate, improves the strength of the injection-molded cable reel, eliminates the manual assembly process, and reduces the process cost of the cable reel.

[0005] The technical solution adopted by the utility model is as follows: an integrated plastic winding drum and its molding mold using step-by-step injection molding, including an integrated drum body, the integrated drum body including a first drum body and a second drum body arranged in parallel and spaced apart, a cylinder body connected between the first drum body and the second drum body, a winding space formed between the first drum body, the second drum body and the cylinder body, and an inner support block; the inner support block includes two blocks, and the inner support block is firstly integrated and injection-molded by a first mold; the inner support block includes a support ring part, a fan-shaped support part and an inner support cylinder; the support ring part is a circular structure; the fan-shaped support part includes at least two, at least two fan-shaped support parts are arranged on the outer side wall of the support ring part at intervals along the circumferential direction, and extend outwardly along the radial direction, and the width increases gradually from the inside to the outside; after the inner support block is integrated and molded, the two inner support blocks are respectively placed in the mold along the axial direction, and then the first drum body, the second drum body and the cylinder body are secondly integrated and injection-molded by a second mold, so that the inner support block is connected to the inner side wall of the upper and lower ends of the cylinder body to form a winding drum.

[0006] Preferably, a circular through hole extending in the axial direction is provided in the middle of the cylinder; and the inner support block is connected and fixed to the inner side wall of the circular through hole.

[0007] Preferably, the inner support block further comprises an inner support tube, which is connected to the end wall of the support ring portion and extends in the axial direction, and the inner support tube is communicated with the middle through hole of the support ring portion.

[0008] Preferably, when the inner support block is subjected to the second integrated injection molding, the inner support tubes of the two inner support blocks extend into the cylinder body respectively and butt joint with each other to form a cylindrical structure having the same center as the cylinder body.

[0009] Preferably, the inner support block further comprises an inner support ring, which is arranged in the middle of the support ring portion and is cocentric with the support ring portion.

[0010] Preferably, one side end wall of the inner support block is a planar structure, and the other side of the inner support block is provided with an empty groove; at least two reinforcing ribs are provided in the empty groove; at least two reinforcing ribs are arranged in the empty groove on the other side of the support ring part and the fan-shaped support part to enhance the bearing capacity.

[0011] Preferably, a concave-convex ring portion is provided on the outer end wall of the fan-shaped support portion; the concave-convex ring portion extends along an arc direction on the outer end wall of the fan-shaped support portion, and the concave-convex ring portion is provided with protrusions and first grooves alternately spaced along the arc direction; the concave-convex ring portion is connected to the inner wall of the circular through hole during the second integrated molding process, and fluid plastic is injected into the first groove to strengthen the connection strength between the fan-shaped support portion and the inner wall of the circular through hole.

[0012] Preferably, a second groove is provided on the outer end wall of the fan-shaped support portion; the second groove includes at least two, at least two second grooves are spaced apart on the outer end wall of the fan-shaped support portion and extend along an arc direction; the second groove is connected to the inner wall of the circular through hole during the second integrated molding process, and fluid plastic is injected into the second groove to strengthen the connection strength between the fan-shaped support portion and the inner wall of the circular through hole.

[0013] A molding die for an integrated plastic winding reel using step-by-step injection molding comprises a first mold and a second mold, wherein the first mold is used to mold the inner support block; the second mold is used to carry two inner support blocks spaced apart in the axial direction, and to integrally injection mold the first disk body, the second disk body and the cylinder body, so that the inner support blocks are connected to the inner side walls of the upper and lower ends of the cylinder body to form a winding reel.

[0014] Preferably, the first mold comprises a first lower mold, a first protrusion, a first upper mold and a molding groove, wherein the first upper mold and the first lower mold are arranged at intervals in the upper and lower parts; the surface of the first lower mold is provided with a first protrusion protruding upward, and the middle part of the first protrusion is provided with a molding through hole extending downward; an axis core is inserted in the molding through hole; a molding groove recessed upward is provided on the bottom surface of the first upper mold; after the first lower mold and the first upper mold are close to each other and molded, the first protrusion is embedded in the molding groove, the gap space between the first protrusion and the molding groove is used to form the support ring part and the fan-shaped support part of the inner support block, and the gap space between the axis core and the molding through hole is used to form the inner support tube of the inner support block; the second mold comprises a second lower mold, a limiting strip, a side core seat, a second upper mold and an inner core, wherein the limiting strip comprises two, and the two limiting strips are fixedly arranged in parallel and spaced apart; the second lower mold is arranged below the limiting strip, the surface of the second lower mold is provided with a second protrusion, and the front and rear sides of the second protrusion are respectively provided with a first embedding groove, and the second lower mold is embedded in the two limiting strips from below through the first embedding groove; the side core seat comprises two The two side core seats are arranged at intervals on the left and right, and are slidably connected to the two limit strips through the second embedding grooves arranged on the front and rear sides below them, so as to open or close the mold. The side walls of the two side core seats close to each other are respectively provided with semicircular semicircular grooves, and the upper and lower surfaces of the two side core seats are respectively provided with semi-annular grooves; after the two side core seats are closed, the two semicircular grooves are combined to form a circular through groove, and the two semi-annular grooves are combined to form an annular groove; the second upper mold is arranged above the side core seat, and the bottom of the second upper mold is provided with a second protrusion; the inner core is arranged between the two side core seats The upper and lower surfaces of the inner core are respectively provided with at least two fan-shaped grooves, and the at least two fan-shaped grooves are arranged at intervals along the circumferential direction for placing the inner support block; after the mold is closed, the gap space between the inner core and the circular through groove is used to form the cylinder body, the gap space between the second protrusion on the second lower mold and the lower circular groove is used to form the first disk body, the gap space between the second protrusion on the second upper mold and the upper circular groove is used to form the second disk body, and the plastic material injected into the gap space between the outer wall of the inner support block and the inner wall of the circular through groove is used to connect the inner support block with the cylinder body.

[0015] The beneficial effects of the utility model are:

[0016] In view of the defects and shortcomings of the prior art, the utility model independently developed and designed a one-piece winding reel that adopts two-step injection molding of the inner support block and the integrated reel body, which not only solves the problems of high assembly cost and low efficiency of spare parts and mutual position offset of accessories, but also effectively reduces the molding mold structure and the opening and closing mold actions, improves the injection molding yield rate, improves the strength of the injection molded cable reel, eliminates the manual assembly process, and reduces the process cost of the cable reel.

[0017] The utility model is developed based on the defects of the existing integrated injection molding of the winding reel. It creatively provides a step-by-step injection molding winding reel, which not only avoids the problems of high assembly cost, low efficiency and mutual position offset of parts in the manufacturing method using spare parts assembly; at the same time, it solves the problems of complex mold structure and many opening and closing mold actions in the integrated injection molding method, which lead to high molding cost and low yield rate. Based on the integrated injection molding, the structure of the winding reel is divided into an inner support block inside the cylinder and an integrated disk body including a first disk body, a second disk body and a cylinder body. In the manufacturing process, two inner support blocks are firstly molded by the first injection molding, and then the two inner support blocks are placed in the mold at intervals in the axial direction, and then the integrated disk body is molded by the second injection molding, so that the inner support block is connected and fixed to the inner wall of the circular through hole of the cylinder to form a complete winding reel. In particular, the inner support block of the utility model uses the circular support ring portion in the middle as the bearing base, and a plurality of fan-shaped support portions are provided on the outer wall of the support ring portion at intervals along its circumferential direction. The fan-shaped support portions extend from the outside in the radial direction, and the width gradually increases to improve the bearing capacity. The outer end wall surface of the fan-shaped support portion is connected to the inner wall of the circular through hole of the cylinder body during the second injection molding to form an integral injection support, and to ensure the connection strength, an arc-shaped concave-convex ring portion or a plurality of second grooves are provided on the outer end wall surface of the fan-shaped support portion. During the second injection molding, the fluid plastic material flows into the first groove or the second groove of the concave-convex ring portion to improve the connection strength. Specifically, the utility model includes the following advantages: segmented molding, 1. This product uses two pairs of molds and is injection molded in two steps; 2. The rubber used in the two steps is the same rubber or two miscible rubbers; 3. During production, the first step is to use the first pair of molds to injection mold the two middle parts (inner support blocks); 4. During the second step of molding, the parts (inner support blocks) molded in the first step are installed in the second pair of molds, and then the molds are closed for injection molding, and the molten rubber injected for the second time is fused with the parts molded in the first step to form a whole; then the mold is opened to take out the finished product. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is one of the three-dimensional structural schematic diagrams of Example 1 of the utility model.

[0019] Figure 2 This is the second schematic diagram of the three-dimensional structure of Example 1 of the utility model.

[0020] Figure 3 This is one of the schematic diagrams of the component disassembly structure of Example 1 of the utility model.

[0021] Figure 4 This is the second schematic diagram of the component disassembly structure of Example 1 of the utility model.

[0022] Figure 5It is a schematic diagram of the three-dimensional structure of the inner support block of Example 1 of the utility model.

[0023] Figure 6 This is one of the three-dimensional structural schematic diagrams of Example 2 of the utility model.

[0024] Figure 7 This is the second schematic diagram of the three-dimensional structure of Example 2 of the utility model.

[0025] Figure 8 This is one of the schematic diagrams of the component disassembly structure of Example 2 of the utility model.

[0026] Fig. 9 This is the second schematic diagram of the component disassembly structure of Example 2 of the utility model.

[0027] Fig.10 It is a schematic diagram of the three-dimensional structure of the inner support block of Example 2 of the utility model.

[0028] Fig.11 This is one of the schematic diagrams of the component disassembly structure of the first mold of the utility model.

[0029] Fig.12 This is the second schematic diagram of the component disassembly structure of the first mold of the utility model.

[0030] Fig.13 This is one of the schematic diagrams of the component disassembly structure of the second mold of the utility model.

[0031] Fig.14 This is the second schematic diagram of the component disassembly structure of the second mold of the utility model.

[0032] Fig.15 This is the third schematic diagram of the component disassembly structure of the second mold of the utility model.

[0033] Fig.16 This is the fourth schematic diagram of the component disassembly structure of the second mold of the utility model. DETAILED DESCRIPTION

[0034] The utility model will be further described below in conjunction with the accompanying drawings:

[0035] like Figures 1 to 10As shown, the technical solution adopted in this embodiment is as follows: an integrated plastic winding reel and its molding mold using step-by-step injection molding, including an integrated reel body, the integrated reel body including a first reel body 2 and a second reel body 3 arranged in parallel and spaced apart, a cylinder body 1 is connected between the first reel body 2 and the second reel body 3, a winding space is formed between the first reel body 2, the second reel body 3 and the cylinder body 1, and also includes an inner support block 4; the inner support block 4 includes two blocks, and the inner support block 4 is firstly integrated and injection-molded by a first mold; the inner support block 4 includes a support ring portion 41, a fan-shaped support portion 42 and an inner support block 43 ... Support tube 43; the support ring portion 41 is a circular structure; the fan-shaped support portion 42 includes at least two, at least two fan-shaped support portions 42 are arranged on the outer wall of the support ring portion 41 at intervals along the circumferential direction, and extend outward in the radial direction, and the width increases gradually from the inside to the outside; after the inner support block 4 is integrally formed, the two inner support blocks 4 are respectively placed in the mold along the axial direction, and then the first disk body 2, the second disk body 3 and the cylinder body 1 are integrally injection molded for the second time through the second mold, so that the inner support block 4 is connected to the inner side walls of the upper and lower ends of the cylinder body 1 to form a winding drum.

[0036] A circular through hole A extending in the axial direction is provided in the middle of the cylinder 1 ; the inner support block 4 is connected and fixed to the inner side wall of the circular through hole A. Example 1

[0037] like Figures 1 to 5 As shown, as an embodiment of the utility model, the inner support block 4 of this embodiment also includes an inner support tube 43, which is connected to the end wall of the support ring part 41 and extends along the axial direction. The inner support tube 43 is connected to the middle through hole of the support ring part 41.

[0038] During the second integral injection molding of the inner support block 4 , the inner support tubes 43 of the two inner support blocks 4 extend into the cylinder body 1 respectively and butt joint with each other to form a cylindrical structure having the same center as the cylinder body 1 .

[0039] A concave-convex ring portion 44 is provided on the outer end wall of the fan-shaped support portion 42; the concave-convex ring portion 44 extends along an arc direction on the outer end wall of the fan-shaped support portion 42, and the concave-convex ring portion 44 is provided with protrusions and first grooves B alternately spaced along the arc direction; the concave-convex ring portion 44 is connected to the inner wall of the circular through hole A during the second integrated molding process, and liquid plastic is injected into the first groove B to strengthen the connection strength between the fan-shaped support portion 42 and the inner wall of the circular through hole A.

[0040] One side end wall of the inner support block 4 is a planar structure, and the other side of the inner support block 4 is provided with an empty groove; at least two reinforcing ribs 45 are provided in the empty groove; at least two reinforcing ribs 45 are arranged in the empty groove on the other side of the support ring part 41 and the fan-shaped support part 42 to enhance the bearing capacity. Example 2

[0041] like Figures 6 to 10 As shown, as an embodiment of the present utility model, the inner support block 4 further includes an inner support ring 46 , which is disposed in the middle of the support ring portion 41 and is cocentric with the support ring portion 41 .

[0042] A second groove C is provided on the outer end wall of the fan-shaped support portion 42; the second groove C includes at least two, at least two second grooves C are spaced apart on the outer end wall of the fan-shaped support portion 42, and extend along the arc direction; the second groove C is connected to the inner wall of the circular through hole A during the second integrated molding process, and fluid plastic is injected into the second groove C to strengthen the connection strength between the fan-shaped support portion 42 and the inner wall of the circular through hole A.

[0043] One side end wall of the inner support block 4 is a planar structure, and the other side of the inner support block 4 is provided with an empty groove; at least two reinforcing ribs 45 are provided in the empty groove; at least two reinforcing ribs 45 are arranged in the empty groove on the other side of the support ring part 41 and the fan-shaped support part 42 to enhance the bearing capacity. Example 3

[0044] like Figures 11 to 16 As shown, as an embodiment of the utility model, this embodiment is a molding mold of an integrated plastic winding reel using step-by-step injection molding, including a first mold and a second mold, wherein the first mold is used to mold the inner support block 4; the second mold is used to carry two inner support blocks 4 at intervals along the axial direction, and to integrally injection mold the first disk body 2, the second disk body 3 and the cylinder body 1, so that the inner support block 4 is connected to the inner side walls of the upper and lower ends of the cylinder body 1 to form a winding reel. Example 4

[0045] like Figure 11 to Figure 12 As shown, as an embodiment of the utility model, the first mold of this embodiment includes a first lower mold 01, a first protrusion 02, a first upper mold 04 and a molding groove E, wherein the first upper mold 04 and the first lower mold 01 are arranged at intervals in the upper and lower parts; the surface of the first lower mold 01 is provided with a first protrusion 02 protruding upward, and the middle part of the first protrusion 02 is provided with a molding through hole D extending downward; an axis core 03 is inserted in the molding through hole D; an upwardly recessed molding groove E is provided on the bottom surface of the first upper mold 04; after the first lower mold 01 and the first upper mold 04 are close to each other and molded, the first protrusion 02 is embedded in the molding groove E, and the gap space between the first protrusion 02 and the molding groove E is used to mold the support ring portion 41 and the fan-shaped support portion 42 of the inner support block 4, and the gap space between the axis core 03 and the molding through hole D is used to mold the inner support tube 43 of the inner support block 4. Example 5

[0046] like Figures 13 to 16As shown, as an embodiment of the utility model, the second mold of this embodiment includes a second lower mold 05, a limiting strip 06, a side core seat 07, a second upper mold 08 and an inner core 09, wherein the limiting strip 06 includes two, and the two limiting strips 06 are fixedly arranged in parallel and spaced apart; the second lower mold 05 is arranged below the limiting strip 06, and the surface of the second lower mold 05 is provided with a second protrusion F, and the front and rear sides of the second protrusion F are respectively provided with a first embedding groove G, and the second lower mold 05 is embedded in the two limiting strips 06 from below through the first embedding groove G; the side core seat 07 includes two, and the two side core seats 07 are spaced apart from each other, and are slidably connected to the two limiting strips 06 through the second embedding groove H arranged on the front and rear sides below them, so as to open or close the mold, and semicircular semicircular grooves are respectively provided on the side walls of the two side core seats 07 close to each other, and semi-annular grooves are respectively provided on the upper and lower surfaces of the two side core seats 07 I; after the two side core seats 07 are molded together, the two semicircular grooves are merged to form a circular through groove, and the two semi-annular grooves I are merged to form an annular groove; the second upper mold 08 is arranged above the side core seat 07, and a second protrusion F is provided at the bottom of the second upper mold 08; the inner core 09 is arranged between the two side core seats 07, and the upper and lower surfaces of the inner core 09 are respectively provided with at least two fan-shaped grooves J, and at least two fan-shaped grooves J are arranged at intervals along the circumferential direction for placing the inner support block 4; after the molds are closed, the gap space between the inner core 09 and the circular through groove is used to form the cylinder 1, the gap space between the second protrusion F on the second lower mold 05 and the lower annular groove is used to form the first disk body 2, the gap space between the second protrusion F on the second upper mold 08 and the upper annular groove is used to form the second disk body 3, and the plastic material injected into the gap space between the outer wall of the inner support block 4 and the inner wall of the circular through groove is used to connect the inner support block 4 with the cylinder 1. Example 6

[0047] like Figures 13 to 16 As shown, as an embodiment of the utility model, the inner core 09 of this embodiment is a cylindrical structure with a central hole formed by splicing 6 inner core bodies together. The 6 inner core bodies are arranged in groups of three and staggered along the axial direction, so that the upper and lower ends of the cylindrical structure form upper and lower convex fan-shaped grooves and fan-shaped protrusions respectively.

[0048] Furthermore, the utility model designs a one-piece winding reel that is molded in steps by two injection moldings of the inner support block and the one-piece reel, which not only solves the problems of high assembly cost, low efficiency and mutual positional offset of parts, but also effectively reduces the molding mold structure and the opening and closing mold actions, improves the injection molding yield, improves the strength of the injection-molded cable reel, eliminates the manual assembly process, and reduces the process cost of the cable reel. The utility model is based on the defects of the existing integrated injection molding of the winding reel, and is improved and developed; it creatively provides a step-by-step injection molding winding reel, which not only avoids the problems of high assembly cost, low efficiency and mutual positional offset of parts in the method of assembling parts; at the same time, it solves the problems of high molding cost and low yield caused by complex mold structure and many opening and closing mold actions in the integrated injection molding method. Based on integrated injection molding, the structure of the winding drum is divided into an inner support block inside the cylinder and an integrated disk body including a first disk body, a second disk body and a cylinder body. During the manufacturing process, two inner support blocks are firstly formed by the first injection molding, and then the two inner support blocks are placed in the mold at intervals along the axial direction, and then the integrated disk body is formed by the second injection molding, so that the inner support blocks are connected and fixed to the inner wall of the circular through hole of the cylinder to form a complete winding drum. In particular, the inner support block of the utility model uses the circular support ring portion in the middle as the bearing base, and a plurality of fan-shaped support portions are provided on the outer wall of the support ring portion at intervals along its circumferential direction. The fan-shaped support portions extend from the outside in the radial direction, and the width gradually increases to improve the bearing capacity. The outer end wall surface of the fan-shaped support portion is connected to the inner wall of the circular through hole of the cylinder body during the second injection molding to form an integral injection support, and to ensure the connection strength, an arc-shaped concave-convex ring portion or a plurality of second grooves are provided on the outer end wall surface of the fan-shaped support portion. During the second injection molding, the fluid plastic material flows into the first groove or the second groove of the concave-convex ring portion to improve the connection strength. Specifically, the utility model includes the following advantages: segmented molding, 1. This product uses two pairs of molds and is injection molded in two steps; 2. The rubber used in the two steps is the same rubber or two miscible rubbers; 3. During production, the first step is to use the first pair of molds to injection mold the two middle parts; 4. During the second step of molding, the parts molded in the first step are installed in the second pair of molds, and then the molds are closed for injection molding. The molten rubber injected for the second time is fused with the parts molded in the first step to form a whole; then the mold is opened to take out the finished product.

[0049] The embodiments of the utility model are only to introduce its specific implementation methods and are not intended to limit its protection scope. The technicians in this industry can make some modifications inspired by the embodiments, so any equivalent changes or modifications made in accordance with the scope of the utility model patent are within the scope of the claims of the utility model patent.

Claims

1. An integrated plastic winding reel formed by step-by-step injection molding, comprising an integrated reel body, the integrated reel body comprising a first reel body (2) and a second reel body (3) arranged in parallel and spaced apart, a cylinder body (1) being connected between the first reel body (2) and the second reel body (3), a winding space being formed between the first reel body (2), the second reel body (3) and the cylinder body (1), characterized in that: It also includes an inner support block (4); The inner support block (4) comprises two blocks, and the inner support block (4) is integrally injection-molded for the first time using a first mold; The inner support block (4) comprises a support ring portion (41), a fan-shaped support portion (42) and an inner support tube (43); The support ring portion (41) is a circular structure; The fan-shaped support portions (42) include at least two fan-shaped support portions (42), which are arranged at intervals along the circumferential direction on the outer side wall of the supporting ring portion (41), extend outwardly along the radial direction, and have a width that gradually increases from the inside to the outside; After the inner support blocks (4) are integrally formed, the two inner support blocks (4) are respectively placed in the mold along the axial direction, and then the first disk body (2), the second disk body (3) and the cylinder body (1) are integrally injection molded for a second time through a second mold, so that the inner support blocks (4) are connected to the inner side walls of the upper and lower ends of the cylinder body (1), forming a winding disk.

2. The one-piece plastic winding reel formed by step-by-step injection molding according to claim 1, characterized in that: A circular through hole (A) extending in the axial direction is provided in the middle of the cylinder (1); the inner support block (4) is connected and fixed to the inner side wall of the circular through hole (A).

3. The one-piece plastic winding reel formed by step-by-step injection molding according to claim 1, characterized in that: The inner support block (4) further comprises an inner support tube (43), which is connected to the end wall of the support ring portion (41) and extends in the axial direction, and the inner support tube (43) is connected to a middle through hole of the support ring portion (41).

4. The one-piece plastic winding reel formed by step-by-step injection molding according to claim 3, characterized in that: During the second integrated injection molding of the inner support block (4), the inner support cylinders (43) of the two inner support blocks (4) extend into the cylinder body (1) respectively and butt joint with each other to form a cylindrical structure cocentric with the cylinder body (1).

5. The one-piece plastic winding reel formed by step-by-step injection molding according to claim 1, characterized in that: The inner support block (4) further comprises an inner support ring (46), which is arranged in the middle of the support ring portion (41) and is cocentric with the support ring portion (41).

6. The one-piece plastic winding reel formed by step-by-step injection molding according to claim 1, characterized in that: One side end wall of the inner support block (4) is a planar structure, and the other side of the inner support block (4) is provided with an empty groove; at least two reinforcing rib plates (45) are provided in the empty groove; at least two reinforcing rib plates (45) are arranged in the empty groove on the other side of the supporting ring portion (41) and the fan-shaped support portion (42) to enhance the bearing capacity.

7. The one-piece plastic winding reel formed by step-by-step injection molding according to claim 2, characterized in that: A concave-convex ring portion (44) is provided on the outer end wall of the fan-shaped support portion (42); the concave-convex ring portion (44) extends along an arc direction on the outer end wall of the fan-shaped support portion (42), and convex blocks and first grooves (B) are alternately provided on the concave-convex ring portion (44) along the arc direction; the concave-convex ring portion (44) is connected to the inner wall of the circular through hole (A) during the second integrated molding process, and liquid plastic is injected into the first groove (B) to strengthen the connection strength between the fan-shaped support portion (42) and the inner wall of the circular through hole (A).

8. The one-piece plastic winding reel formed by step-by-step injection molding according to claim 2, characterized in that: A second groove (C) is provided on the outer end wall of the fan-shaped support portion (42); the second groove (C) includes at least two second grooves (C), which are arranged at intervals on the outer end wall of the fan-shaped support portion (42) and extend in an arc direction; the second groove (C) is connected to the inner wall of the circular through hole (A) during the second integrated molding process, and fluid plastic is injected into the second groove (C) to strengthen the connection strength between the fan-shaped support portion (42) and the inner wall of the circular through hole (A).

9. A forming mold for an integrated plastic winding reel using step-by-step injection molding as claimed in claim 1, characterized in that: The invention comprises a first mould and a second mould, wherein the first mould is used for forming the inner support block (4); the second mould is used for carrying two inner support blocks (4) at intervals in the axial direction, and for integrally injection moulding the first disc body (2), the second disc body (3) and the cylinder body (1), so that the inner support blocks (4) are connected to the inner side walls of the upper and lower ends of the cylinder body (1), thereby forming a winding disc.

10. The forming mold of the integrated plastic winding reel using step-by-step injection molding according to claim 9, characterized in that: The first mold comprises a first lower mold (01), a first protrusion (02), a first upper mold (04) and a molding groove (E), wherein the first upper mold (04) and the first lower mold (01) are arranged at an interval from top to bottom; the surface of the first lower mold (01) is provided with a first protrusion (02) protruding upward, and the middle of the first protrusion (02) is provided with a molding through hole (D) extending downward; an axis core (03) is inserted into the molding through hole (D); the bottom surface of the first upper mold (04) is provided with a molding groove (E) recessed upward; after the first lower mold (01) and the first upper mold (04) are brought close to each other and molded together, the first protrusion (02) is embedded in the molding groove (E), the gap space between the first protrusion (02) and the molding groove (E) is used to mold the support ring portion (41) and the fan-shaped support portion (42) of the inner support block (4), and the gap space between the axis core (03) and the molding through hole (D) is used to mold the inner support tube (43) of the inner support block (4); The second mold comprises a second lower mold (05), a limiting strip (06), a side core seat (07), a second upper mold (08) and an inner core (09), wherein the limiting strip (06) comprises two, and the two limiting strips (06) are fixedly arranged in parallel and spaced apart; the second lower mold (05) is arranged below the limiting strip (06), a second protrusion (F) is arranged on the surface of the second lower mold (05), and first embedding grooves (G) are respectively arranged on the front and rear sides of the second protrusion (F); the second lower mold (05) is provided with a first embedding groove (G) through The first embedding groove (G) is embedded in the two limiting strips (06) from below; the side core seats (07) include two, the two side core seats (07) are arranged at intervals on the left and right, and are slidably connected to the two limiting strips (06) through the second embedding grooves (H) arranged on the front and rear sides below them, so as to open or close the mold, and the side walls of the two side core seats (07) close to each other are respectively provided with semicircular semicircular grooves, and the upper and lower surfaces of the two side core seats (07) are respectively provided with semi-annular grooves (I); the two side core seats (07 ) after the mold is closed, the two semicircular grooves are combined to form a circular through groove, and the two semi-annular grooves (I) are combined to form an annular groove; the second upper mold (08) is arranged above the side core seat (07), and the bottom of the second upper mold (08) is provided with a second protrusion (F); the inner core (09) is arranged between the two side core seats (07), and the upper and lower surfaces of the inner core (09) are respectively provided with at least two fan-shaped grooves (J), and the at least two fan-shaped grooves (J) are arranged at intervals along the circumferential direction for placing the inner support block (4); after the mold is closed, The gap space between the inner core (09) and the circular groove is used to form the cylinder (1), the gap space between the second protrusion (F) on the second lower mold (05) and the lower circular groove is used to form the first disk (2), the gap space between the second protrusion (F) on the second upper mold (08) and the upper circular groove is used to form the second disk (3), and the plastic material injected into the gap space between the outer wall of the inner support block (4) and the inner wall of the circular groove is used to connect the inner support block (4) to the cylinder (1).

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