Injection mold for sleeving plastic transmission rod with metal rod

Abstract

The utility model relates to the technical field of injection molds, in particular to an injection mold for sleeving a plastic transmission rod with a metal rod. Comprising a lower die holder and an upper die holder movably mounted at the top of the lower die holder, and the upper die holder and the lower die holder can define a main body forming cavity for forming the plastic transmission rod after being closed; the lower die base is provided with a first insert, and the top of the first insert is provided with a first magnet used for magnetically attracting and fixing the metal rod. And the first insert extends towards one end of the main body forming cavity, so that the first magnet extends into the main body forming cavity. Compared with the prior art, before the plastic transmission rod is subjected to injection molding, a metal rod is fed into the main body molding cavity, and the metal rod is magnetically attracted and fixed through the first magnet; according to the injection mold, the defect that the metal rod deviates due to vibration in the mold closing process of the injection mold can be overcome, and after the plastic transmission rod is subjected to injection molding, the metal rod cannot be subjected to mold pressing, so that the production yield of sleeving the metal rod with the plastic transmission rod is increased, and the manufacturing cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and in particular to an injection mold for inserting a metal rod into a plastic transmission rod. Background Technology

[0002] In related technologies, hair styling devices are equipped with transmission rods to drive the movement of components. These transmission rods are typically injection-molded from plastic material, with a metal rod embedded within them to enhance the overall rigidity of the plastic transmission rod. Before injection molding the plastic transmission rod, the metal rod needs to be placed in the molding cavity of the mold. Then, hot melt slurry is injected through the injection mold to mold the plastic transmission rod, achieving a seamless molding process by the plastic transmission rod encapsulating the metal rod.

[0003] However, the inventors discovered in actual production operations that, since the metal rod is a cylindrical structure, after the metal rod is placed in the molding cavity, it will be displaced due to vibration during the mold closing process, resulting in misalignment. Once the metal rod is misaligned, the injection molding transmission rod will have molding defects, resulting in a low injection molding yield of the transmission rod.

[0004] Therefore, a new technical solution needs to be researched to address the above problems. Utility Model Content

[0005] In view of this, the present invention addresses the deficiencies of the existing technology, and its main objective is to provide an injection mold for a plastic transmission rod sleeved with a metal rod, effectively solving the technical defect of low production yield in the existing injection molds used for injection molding plastic transmission rods.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an injection mold for molding a plastic transmission rod into a metal rod, comprising a lower mold base and an upper mold base movably installed on the top of the lower mold base, wherein the upper mold base and the lower mold base, after being closed, can form a main molding cavity for molding the plastic transmission rod.

[0007] The lower mold base is provided with a first insert, and the top of the first insert is provided with a first magnet for magnetically fixing the metal rod; the first insert extends to one end of the main body molding cavity, so that the first magnet extends into the main body molding cavity.

[0008] The beneficial effects of the injection mold for the plastic transmission rod sleeve with metal rod provided in this application are as follows: Compared with the prior art, by setting a first magnet on the top of the first insert, the metal rod is loaded into the main body molding cavity before injection molding the plastic transmission rod, and the metal rod is magnetically fixed by the first magnet; this can solve the defect of metal rod misalignment caused by vibration during the mold closing process. After the plastic transmission rod is injection molded, the metal rod will not be crushed, thereby improving the production yield of the plastic transmission rod sleeve with metal rod and reducing the manufacturing cost.

[0009] As a preferred embodiment: the lower mold base has a lower mold core at the top, and the upper mold base has an upper mold core at the bottom;

[0010] The main molding cavity includes a first recess located at the top of the lower mold core and a second recess located at the bottom of the upper mold core. When the upper mold base moves down relative to the lower mold base, the upper mold core can close with the lower mold core, so that the first recess and the second recess surround the main molding cavity.

[0011] As a preferred embodiment: the lower mold core is provided with a first mounting hole penetrating its upper and lower surfaces, and the top of the first mounting hole communicates with the first cavity;

[0012] The first insert is fixedly installed in the first mounting hole, and the first magnet extends into the main body molding cavity through the top of the first mounting hole.

[0013] As a preferred embodiment: the upper mold core is provided with a second mounting hole that penetrates its upper and lower surfaces, and the bottom of the second mounting hole is connected to the second cavity;

[0014] The second mounting hole is fixedly installed with the second insert, the bottom of the second insert extending downward into the main body molding cavity;

[0015] The first magnet is used for the lower hole of the injection-molded plastic transmission rod, and the second insert is used for the upper hole of the injection-molded plastic transmission rod.

[0016] As a preferred embodiment: a third mounting hole is provided on the right side of the lower mold core, and a first positioning insert is installed in the third mounting hole, with the top of the first positioning insert extending upward into the main body molding cavity;

[0017] The upper mold core has a fourth mounting hole on its right side, and a second positioning insert is installed in the fourth mounting hole. The bottom of the second positioning insert extends downward into the main body molding cavity.

[0018] After the metal rod is fed into the main molding cavity, the right side of the metal rod can abut against the left side of the first positioning insert and the second positioning insert.

[0019] As a preferred embodiment: a first slide is movably mounted on the left side of the lower mold base, the left side of the first slide is provided with a first working inclined surface, and the right side of the first slide is provided with a third positioning insert;

[0020] A first abutment is fixedly installed on the bottom left side of the upper mold base, and a second working inclined surface is provided on the right side of the first abutment. When the upper mold base moves down relative to the lower mold base, the first abutment can act to move the first sliding position to the right, so that the third positioning insert abuts against the left side of the metal rod.

[0021] As a preferred embodiment: the lower mold base is equipped with a first movable plate that can move up and down, and an inclined insert is pivotally connected to the top of the first movable plate;

[0022] The main molding cavity also includes a third cavity recessed at the bottom of the first cavity. The lower mold core is provided with an oblique through hole that penetrates its upper and lower surfaces and communicates with the third cavity. The top of the oblique insert can pass through the oblique through hole and extend into the third cavity. The oblique insert and the third cavity together form a molding chamber for injection molding of the plastic transmission rod extension block.

[0023] As a preferred embodiment: the top of the first movable plate is provided with a first pivot seat, the first pivot seat is provided with a pivot groove, and the bottom of the inclined insert is provided with a pivot protrusion that can be rotatably installed in the pivot groove.

[0024] As a preferred embodiment: the top of the inclined insert is provided with a first limiting groove, the first limiting groove extends through its left and right surfaces, and the width of the first limiting groove in the front-to-back direction is greater than the width of the metal rod in the front-to-back direction.

[0025] As a preferred embodiment: a second movable plate is stacked on top of the first movable plate, and a first ejector pin is provided on the top of the second movable plate;

[0026] The lower mold core is provided with a first through hole that penetrates its upper and lower surfaces and connects to the first concave cavity, and the first ejector pin can pass through the first through hole and extend into the main body molding cavity. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a three-dimensional structural schematic diagram of the injection mold for the plastic transmission rod sleeve and metal rod provided in the embodiments of this application;

[0029] Figure 2 yes Figure 1 The diagram shows the specific structure of the lower mold base in the injection mold for the plastic transmission rod sleeve and the metal rod.

[0030] Figure 3 yes Figure 2The image shows a magnified view of point A on the lower mold base of the injection mold for the plastic transmission rod sleeved with a metal rod.

[0031] Figure 4 yes Figure 1 The diagram shows the specific structure of the upper mold base in the injection mold for the plastic transmission rod sleeve and the metal rod.

[0032] Figure 5 yes Figure 1 The first cross-sectional view of the injection mold for the plastic transmission rod sleeve and the metal rod shown.

[0033] Figure 6 yes Figure 5 A magnified view of part B in the injection mold for the plastic transmission rod sleeve and the metal rod shown;

[0034] Figure 7 yes Figure 1 The diagram shows a three-dimensional structure of a plastic transmission rod sleeved with a metal rod, formed by injection molding.

[0035] The following are the labeling elements in the figure:

[0036] 100. Injection mold for plastic transmission rod sleeve and metal rod;

[0037] 10. Lower mold base; 11. Lower mold core; 111. First mounting hole; 112. Third mounting hole; 113. Angled through hole; 114. First through hole; 12. First insert; 121. First magnet; 13. First positioning insert; 14. First slide; 141. First acting inclined surface; 142. Third positioning insert; 15. First movable plate; 151. First pivot seat; 152. Pivot groove; 16. Angled insert; 161. Pivot protrusion; 162. First limiting groove; 17. Second movable plate; 171. First ejector pin;

[0038] 20. Upper mold base; 21. Upper mold core; 211. Second mounting hole; 212. Fourth mounting hole; 22. Second insert; 23. Second positioning insert; 24. First abutment; 241. Second working slope; 25. Glue inlet;

[0039] 30. Main body forming cavity; 31. First concave cavity; 32. Second concave cavity; 33. Third concave cavity;

[0040] 200. Plastic transmission rod; 2001. Lower side hole; 2002. Upper side hole; 2003. Extension block;

[0041] 300. Metal rod. Detailed Implementation

[0042] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0043] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0044] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0046] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0047] Please refer to the following: Figures 1 to 7 The injection mold 100 for molding a plastic transmission rod into a metal rod, as provided in the embodiments of this application, will now be described. The injection mold 100 for molding a plastic transmission rod into a metal rod includes a lower mold base 10 and an upper mold base 20.

[0048] The upper mold base 20 is movably mounted on top of the lower mold base 10. During injection molding, both the upper mold base 20 and the lower mold base 10 are mounted on the injection molding machine. The upper mold base 20 is driven by the drive rod of the injection molding machine to move relative to the lower mold base 10 to close or open the mold. After the upper mold base 20 and the lower mold base 10 are closed, they can form the main molding cavity 30 for molding the plastic transmission rod 200. The lower mold base 10 is provided with a first insert 12. The top of the first insert 12 is provided with a first magnet 121 for magnetically fixing the metal rod 300. The first insert 12 extends towards one end of the main molding cavity 30, so that the first magnet 121 extends into the main molding cavity 30.

[0049] Specifically, by setting a first magnet 121 on the top of the first insert 12, the metal rod 300 is loaded into the main body molding cavity 30 before injection molding the plastic transmission rod, and the first magnet 121 is used to magnetically fix the metal rod 300. This solves the defect of the metal rod 300 being misaligned due to vibration during the mold closing process. After the plastic transmission rod 200 is injection molded, the metal rod 300 will not be compressed, thereby improving the production yield of the plastic transmission rod 200 and the metal rod 300 and reducing the manufacturing cost.

[0050] In some embodiments of this application, the lower mold base 10 is provided with a lower mold core 11 at the top, and the upper mold base 20 is provided with an upper mold core 21 at the bottom; the main body molding cavity 30 includes a first cavity 31 provided at the top of the lower mold core 11 and a second cavity 32 provided at the bottom of the upper mold core 21. When the upper mold base 20 moves down relative to the lower mold base 10, the upper mold core 21 can close with the lower mold core 11, so that the first cavity 31 and the second cavity 32 surround the main body molding cavity 30.

[0051] It should be noted that the upper mold base 20 is provided with a glue inlet 25, which is connected to the main molding cavity 30 through a flow channel. The injection molding machine injects hot melt slurry through the glue inlet 25, and the hot melt slurry flows into the main molding cavity 30 through the flow channel. This is a conventional design method for those skilled in the art, and will not be described in detail here.

[0052] Specifically, the lower mold core 11 is provided with a first mounting hole 111 penetrating its upper and lower surfaces, and the top of the first mounting hole 111 communicates with the first cavity 31; the first insert 12 is fixedly installed in the first mounting hole 111, and the first magnet 121 extends through the top of the first mounting hole 111 into the main body molding cavity 30. The upper mold core 21 is provided with a second mounting hole 211 penetrating its upper and lower surfaces, and the bottom of the second mounting hole 211 communicates with the second cavity 32; the second insert 22 is fixedly installed in the second mounting hole 211, and the bottom of the second insert 22 extends downward into the main body molding cavity 30; the first magnet 121 is used for injection molding the lower hole 2001 of the plastic transmission rod 200, and the second insert 22 is used for injection molding the upper hole 2002 of the plastic transmission rod 200.

[0053] Furthermore, the lower mold core 11 has a third mounting hole 112 on its right side, and a first positioning insert 13 is installed in the third mounting hole 112. The top of the first positioning insert 13 extends upward into the main molding cavity 30. The upper mold core 21 has a fourth mounting hole 212 on its right side, and a second positioning insert 23 is installed in the fourth mounting hole 212. The bottom of the second positioning insert 23 extends downward into the main molding cavity 30. When the metal rod is fed into the main molding cavity 30, the right side of the metal rod can abut against the left side of the first positioning insert 13 and the second positioning insert 23. The lower mold base 10 has a first sliding position 14 movably installed on its left side. The first sliding position 14 has a first working inclined surface 141 on its left side and a third positioning insert 142 on its right side. The upper mold base 20 has a first abutting part 24 fixedly installed on its bottom left side and a second working inclined surface 241 on its right side. When the upper mold base 20 moves down relative to the lower mold base 10, the first abutting part 24 can move the first sliding position 14 to the right, so that the third positioning insert 142 abuts against the left side of the metal rod 300.

[0054] Before injection molding, the metal rod is first loaded into the main molding cavity 30. The first magnet 121 can generate a magnetic attraction force on the metal rod to fix its position, but the attraction force generated by the first magnet 121 is not a strong magnetic force. Then, the upper mold base 20 can move down relative to the lower mold base 10, so that the upper mold core 21 and the lower mold core 11 can close the mold. During the downward movement of the upper mold base 20, the first sliding block 14 can be displaced to the right, so that the third positioning insert 142 abuts against the left side of the metal rod and the metal rod is displaced to the right to adjust its position in the left and right directions. The right side of the metal rod abuts against the left side of the first positioning insert 13 and the second positioning insert 23, which is the final accurate position.

[0055] It can be seen that by setting the first positioning insert 13, the second positioning insert 23 and the third positioning insert 142, the left and right positioning of the metal rod can be completed during the mold closing process, thereby further improving the reliability and yield of 200 sets of plastic transmission rods for injection molding.

[0056] In some other embodiments of this application, the lower mold base 10 is movably mounted with a first movable plate 15, and the top of the first movable plate 15 is pivotally connected to an inclined insert 16; the main molding cavity 30 also includes a third cavity 33 recessed at the bottom of the first cavity 31, and the lower mold core 11 is provided with an inclined through hole 113 penetrating its upper and lower surfaces and communicating with the third cavity 33. The top of the inclined insert 16 can pass through the inclined through hole 113 and extend into the third cavity 33. The inclined insert 16 and the third cavity 33 enclose a molding chamber for injection molding the extension block 2003 of the plastic transmission rod 200. The top of the inclined insert 16 is provided with a first limiting groove 162, which penetrates its left and right surfaces. The width of the first limiting groove 162 in the front-back direction is greater than the width of the metal rod 300 in the front-back direction.

[0057] Specifically, the first limiting groove 162 is designed to locate the approximate loading position of the metal rod during the loading process. Once the metal rod enters the first limiting groove 162, the magnetic force of the first magnet 121 on the metal rod is triggered, thereby fixing the metal rod in place. Simultaneously, the inclined insert 16 can also interact with the third cavity 33 to injection mold the plastic transmission rod 200 extension block 2003, further reducing the number of inserts and simplifying the overall structure of the injection mold.

[0058] More specifically, the first movable plate 15 has a first pivot seat 151 at its top, the first pivot seat 151 has a pivot groove 152, and the bottom of the inclined insert 16 has a pivot protrusion 161 that can be rotatably installed in the pivot groove 152. A second movable plate 17 is stacked on top of the first movable plate 15, and a first ejector pin 171 is provided on the top of the second movable plate 17; the lower mold core 11 has a first through hole 114 that penetrates its upper and lower surfaces and connects to the first cavity 31, and the first ejector pin 171 can pass through the first through hole 114 and extend into the main body molding cavity 30. During blanking, the displacement of the first movable plate 15 simultaneously drives the displacement of the second movable plate 17, and the inclined insert 16 and the first ejector pin 171 simultaneously eject the plastic transmission rod 200 for blanking.

[0059] It should be noted that multiple main molding chambers can be set according to actual production needs, and corresponding components can be set as needed. This allows a single mold to simultaneously injection mold multiple traditional plastic rods. This is a conventional design method for those skilled in the art, and will not be elaborated on here.

[0060] The above are merely preferred embodiments of the present utility model, and only specifically describe the technical principles of the present utility model. These descriptions are only for explaining the principles of the present utility model and should not be construed as limiting the scope of protection of the present utility model in any way. Based on this explanation, any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model, as well as other specific embodiments of the present utility model that can be conceived by those skilled in the art without creative effort, should be included within the scope of protection of the present utility model.

Claims

1. A plastic transmission rod sleeve metal rod injection mold, comprising a lower mold base (10) and an upper mold base (20) movably installed on the top of the lower mold base (10), and the upper mold base (20) and the lower mold base (10) can form a main molding cavity (30) for molding a plastic transmission rod (200) after closing; characterized in that, the lower mold base (10) is provided with a first insert (12), and the top of the first insert (12) is provided with a first magnet (121) for magnetically fixing a metal rod; the first insert (12) extends to one end of the main molding cavity (30), so that the first magnet (121) extends into the main molding cavity (30).

2. The injection mold for plastic drive rod sleeve covering metal rod according to claim 1, characterized in that, The top of the lower mold base (10) is provided with a lower mold core (11), and the bottom of the upper mold base (20) is provided with an upper mold core (21); the main molding cavity (30) comprises a first cavity (31) arranged on the top of the lower mold core (11) and a second cavity (32) arranged on the bottom of the upper mold core (21), and after the upper mold base (20) is lowered relative to the lower mold base (10), the upper mold core (21) can be closed with the lower mold core (11), so that the first cavity (31) and the second cavity (32) form the main molding cavity (30).

3. The injection mold for a plastic drive rod sleeve covering a metal rod according to claim 2, characterized in that The lower mold core (11) is provided with a first mounting hole (111) penetrating the upper and lower surfaces thereof, and the top of the first mounting hole (111) is communicated with the first cavity (31); the first insert (12) is fixedly installed in the first mounting hole (111), and the first magnet (121) extends into the main molding cavity (30) through the top of the first mounting hole (111).

4. The injection mold for a plastic drive rod sleeve covering a metal rod according to claim 3, characterized in that The upper mold core (21) is provided with a second mounting hole (211) penetrating the upper and lower surfaces thereof, and the bottom of the second mounting hole (211) is communicated with the second cavity (32); the second mounting hole (211) is fixedly installed with a second insert (22), and the bottom of the second insert (22) extends downward into the main molding cavity (30); the first magnet (121) is used for injection molding a lower side hole (2001) of the plastic transmission rod (200), and the second insert (22) is used for injection molding an upper side hole (2002) of the plastic transmission rod (200).

5. The injection mold for plastic drive rod sleeve covering metal rod according to any one of claims 2-4, characterized in that, The right side of the lower mold core (11) is provided with a third mounting hole (112), and the first positioning insert (13) is installed in the third mounting hole (112), and the top of the first positioning insert (13) extends upward into the main molding cavity (30); the right side of the upper mold core (21) is provided with a fourth mounting hole (212), and the second positioning insert (23) is installed in the fourth mounting hole (212), and the bottom of the second positioning insert (23) extends downward into the main molding cavity (30); after the metal rod is fed into the main molding cavity (30), the right side of the metal rod can abut against the left side surface of the first positioning insert (13) and the second positioning insert (23).

6. The injection mold for plastic drive rod sleeve covering metal rod according to claim 5, wherein, A first row (14) is movably installed on the left side of the lower mold base (10), the left side of the first row (14) is provided with a first acting inclined surface (141), and the right side of the first row (14) is provided with a third positioning insert (142). The first abutting part (24) is fixedly installed on the bottom left side of the upper die seat (20), and the right side of the first abutting part (24) is provided with a second acting inclined surface (241); after the upper die seat (20) is lowered relative to the lower die seat (10), the first abutting part (24) can act on the first row (14) to displace it to the right, so that the third positioning insert (142) abuts against the left side of the metal rod (300).

7. The injection mold for plastic drive rod sleeve over metal rod according to claim 2 or 3 or 4 or 6, characterized in that, The first movable plate (15) is movably installed on the lower die seat (10), and the top of the first movable plate (15) is pivotally connected with the inclined insert (16); The main body forming cavity (30) further comprises a third recess (33) recessed in the bottom of the first recess (31), the lower die core (11) is provided with an inclined through hole (113) penetrating through the upper and lower surfaces thereof and communicating with the third recess (33), the top of the inclined insert (16) can extend into the third recess (33) through the inclined through hole (113), and the inclined insert (16) and the third recess (33) form a forming chamber for injection molding of the extension block (2003) of the plastic transmission rod (200).

8. The injection mold for plastic drive rod sleeve covering metal rod according to claim 7, wherein, The first movable plate (15) is movably installed on the lower die seat (10), and the top of the first movable plate (15) is pivotally connected with the inclined insert (16); 9. The injection mold for plastic drive rod sleeve covering metal rod according to claim 7, wherein, The top of the inclined insert (16) is provided with a first limiting recess (162) penetrating through the left and right surfaces thereof, and the width of the first limiting recess (162) in the front-rear direction is greater than the width of the metal rod (300) in the front-rear direction.

10. The injection mold for plastic drive rod sleeve covering metal rod according to claim 7, wherein, The top of the first movable plate (15) is stacked with a second movable plate (17), and the top of the second movable plate (17) is provided with a first thimble (171). The lower die core (11) is provided with a first through hole (114) penetrating through the upper and lower surfaces thereof and communicating with the first recess (31), and the first thimble (171) can extend into the main body forming cavity (30) through the first through hole (114).

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