Injection mold capable of avoiding burrs on leaning and breaking surface of mold

Abstract

The utility model discloses an injection mold capable of avoiding burrs of a mold leaning and breaking surface, which belongs to the technical field of rotary transformer stator manufacturing and comprises a moving table, a base for mounting the mold is arranged at the upper end of the moving table through a moving component, a bottom mold is fixed at the top of the base, and a demolding component for demolding is arranged in the bottom mold. An injection molding mechanism for injection molding is arranged at the top of the bottom mold, the injection molding mechanism comprises a contact assembly for mold closing, a spacing structure and a feeding structure for pressure relief, the contact assembly is in limited fit with the top of the bottom mold, and the contact assembly is movably connected with the feeding structure through the spacing structure. By means of the mode, the feeding structure can continue to descend and extrude the redundant part of an injection molding material in the mold closing process of the contact assembly and the bottom mold in the descending process, and finally the feeding structure makes complete contact with the opening in the top of the mold to achieve the sealing effect, so that the problem of burrs caused by too large pressure of injection molding liquid and untight mold closing is avoided; and the product quality can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of rotary transformer stator manufacturing, in particular to an injection mold which can avoid mold surface breakage and burrs. Background Art

[0002] Plastic-encapsulated motors have good prospects for use, and compared with metal-shell motors, they have the advantages of beautiful appearance, low noise and good insulation performance. The rotor part of the plastic-encapsulated motor is manufactured by injection molding.

[0003] Chinese Patent: CN115519741B (Low Burr Rate Injection Mold) discloses an upper mold and a lower mold that are interlocked, wherein the upper mold is provided with an upper cavity, and the lower mold is provided with a lower cavity. The pressure of the airflow is used to offset the overflow tendency of the molten plastic in the molding cavity, thereby reducing the possibility of burrs during injection molding. The airflow can also accelerate the cooling speed of the plastic at the burr, and the cooled plastic prevents other plastics from overflowing into the gap, thereby further reducing the effect of the injection molding burr rate.

[0004] However, the existing devices still have the following problems: 1. The main reasons for the generation of burrs in the injection mold after production include small gaps on the mold surface, excessive mold temperature and excessive pressure inside the mold. Combined with the existing technology, in actual use, the existing technology will process by injecting a certain amount of injection liquid. Whenever the amount of injection liquid is slightly greater than the maximum load-bearing capacity of the mold, pressure will be generated inside the mold, causing uneven force on the material, resulting in burrs during cooling and demolding; 2. The existing technology uses airflow to offset pressure, which will cause dense bubbles to form inside the injection molded part, affecting the quality of the injection molded part. At the same time, some material will overflow from the injection mold during production, causing waste, increasing production costs.

[0005] Based on this, the utility model designs an injection mold which can avoid the mold surface burrs to solve the above problems. Utility Model Content

[0006] In view of the above-mentioned shortcomings of the prior art, the utility model provides an injection mold which can avoid the mold surface burrs.

[0007] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] An injection mold for preventing mold from being broken and burred, comprising a moving table, wherein the upper end of the moving table is provided with a base for mounting the mold through a moving component;

[0009] A bottom mold is fixed on the top of the base, and a demoulding component for demoulding is arranged inside the bottom mold;

[0010] The top of the bottom mold is provided with an injection molding mechanism for injection molding;

[0011] The injection molding mechanism includes a contact component for mold closing, a spacing structure and a feeding structure for pressure relief;

[0012] The contact component is limitedly fitted with the top of the bottom mold, and the contact component is movably connected with the feeding structure through a spacing structure.

[0013] Furthermore, the moving assembly includes a moving plate and a cylinder, the moving plate is fixed on the top of the moving platform, and the cylinder is fixedly installed on the right side of the moving platform.

[0014] Furthermore, the base is slidably connected to the base via a slide rail on the top of the movable plate.

[0015] Furthermore, the output end of the cylinder is fixedly connected to the right outer wall of the base.

[0016] Furthermore, the demoulding assembly includes an air pipe and a push rod, the interior of the bottom mold is slidably connected with the push rod, and the push rod is fixedly installed with the air pipe, and the air pipe is fixedly installed on the front side of the bottom mold.

[0017] Furthermore, the contact assembly includes a contact plate and a cover plate, wherein the cover plate is fixed at the bottom center of the contact plate, and the bottom end of the contact plate is fitted with the top of the bottom mold.

[0018] Furthermore, the spacing structure includes a spacing disk and a retractable rod, the spacing disk is placed on the top of the cover plate and sleeved, and the retractable rod is fixed on the top of the contact plate.

[0019] Furthermore, the feeding structure includes a pressure plate, a feed tray and a pressure relief needle. The feed tray is fixed at the bottom center of the pressure plate, the pressure relief needles are evenly distributed at the bottom of the feed tray, and a soft sealing ring is fixed to the outer wall of the pressure relief needle.

[0020] The utility model has the following technical effects:

[0021] 1. The feeding structure of the utility model will continue to descend and squeeze out the excess part of the injection material in the contact component and the bottom mold during the descending process. Finally, the feeding structure is completely in contact with the top opening of the mold and achieves a sealing effect, thereby avoiding excessive pressure of the injection liquid and burrs caused by loose mold closing, which is beneficial to improving product quality.

[0022] 2. In the utility model, excess overflowing injection molding liquid will fall on the top of the spacer disk, and a drainage port is provided on the right side of the inner side of the contact plate, and the overflowing injection molding liquid will flow out along the drainage port, thereby collecting excess material, avoiding the generation of burrs, improving the recovery rate and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 This is a three-dimensional diagram of the assembly of an injection mold for avoiding mold surface burrs according to the utility model;

[0025] Figure 2 This is an assembly front view of an injection mold for avoiding mold surface burrs of the utility model;

[0026] Figure 3 A three-dimensional diagram of an injection mold for avoiding burrs on the mold surface according to the utility model;

[0027] Figure 4 This is a structural disassembly diagram of an injection mold for avoiding mold surface burrs of the utility model;

[0028] Figure 5 A three-dimensional diagram of a feeding structure of an injection mold for avoiding mold surface burrs according to the utility model;

[0029] Figure 6 A three-dimensional diagram of a demoulding component of an injection mold for preventing mold surface burrs from being broken according to the utility model;

[0030] Figure 7 The utility model is a front cross-sectional view of the mold clamping plate and the contact plate of an injection mold for avoiding mold surface burrs.

[0031] The numbers in the figure represent:

[0032] 1. Moving table; 2. Moving assembly; 21. Moving plate; 22. Cylinder; 3. Base; 4. Bottom mold; 6. Demolding assembly; 61. Air pipe; 62. Push rod; 7. Injection molding mechanism; 71. Contact assembly; 711. Contact plate; 712. Cover plate; 72. Spacer structure; 721. Spacer disk; 722. Retraction rod; 73. Feeding structure; 731. Pressing plate; 732. Feeding tray; 733. Pressure relief needle. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] The utility model is further described below in conjunction with embodiments.

[0035] The terms “left”, “right”, “front”, “back”, “up” and “down” mentioned in the following description are oriented in the viewing direction of the front view.

[0036] Example 1

[0037] Please refer to the instruction manual Figure 1-7 , an injection mold for avoiding mold surface burrs, comprising a moving table 1;

[0038] The upper end of the moving platform 1 is provided with a base 3 for mounting the mold through a moving component 2;

[0039] A bottom mold 4 is fixed on the top of the base 3, and a demoulding component 6 for demoulding is arranged inside the bottom mold 4;

[0040] An injection molding mechanism 7 for injection molding is provided on the top of the bottom mold 4;

[0041] The injection molding mechanism 7 includes a contact component 71 for mold closing, a spacing structure 72 and a material feeding structure 73 for pressure relief;

[0042] The contact component 71 is limitedly fitted with the top of the bottom mold 4 , and the contact component 71 is movably connected to the feeding structure 73 through the spacing structure 72 .

[0043] First, the feeding structure 73 descends, driving the spacing structure 72 to descend. Then, the bottom end of the spacing structure 72 contacts the top of the contact component 71, and the bottom end of the contact component 71 contacts the top of the bottom mold 4, and the grooves inside the contact component 71, the spacing structure 72 and the feeding structure 73 are aligned. At this time, the feeding structure 73 injects the injection molding material, and the material passes through the spacing structure 72 and the contact component 71 into the molding groove of the bottom mold 4 and fills it. When it is about to be filled, the feeding structure 73 descends again, and the contact pressure is reduced under the action of the spacing structure 72 to avoid damaging the mold contact surface. At this time, the feeding structure 73 will continue to descend and squeeze out the excess part of the injection molding material in the mold closing between the contact component 71 and the bottom mold 4 during the descent process. Finally, the feeding structure 73 is completely in contact with the top opening of the mold and achieves a sealing effect, thereby avoiding excessive injection liquid pressure and burrs caused by loose mold closing, which is beneficial to improving product quality.

[0044] Example 2

[0045] like Figure 1-7 As shown, as a preferred embodiment of the utility model, the moving assembly 2 includes a moving plate 21 and a cylinder 22, the moving plate 21 is fixed on the top of the moving platform 1, and the cylinder 22 is fixedly installed on the right side of the moving platform 1;

[0046] The base 3 is slidably connected to the base 3 via a slide rail at the top of the movable plate 21;

[0047] The output end of the cylinder 22 is fixedly connected to the right outer wall of the base 3;

[0048] The demoulding assembly 6 includes an air pipe 61 and a push rod 62. The push rod 62 is slidably connected to the interior of the bottom mold 4, and the push rod 62 is fixedly installed with the air pipe 61. The air pipe 61 is fixedly installed on the front side of the bottom mold 4.

[0049] The contact assembly 71 includes a contact plate 711 and a cover plate 712. The cover plate 712 is fixed at the bottom center of the contact plate 711. The bottom end of the contact plate 711 is in contact with the top of the bottom mold 4.

[0050] The spacing structure 72 includes a spacing disk 721 and a retracting rod 722. The spacing disk 721 is placed on the top of the cover plate 712 and sleeved, and the retracting rod 722 is fixed on the top of the contact plate 711.

[0051] The feeding structure 73 includes a pressing plate 731 , a feeding tray 732 and a pressure relief needle 733 . The feeding tray 732 is fixed at the bottom center of the pressing plate 731 . The pressure relief needles 733 are evenly distributed at the bottom of the feeding tray 732 . A soft sealing ring is fixed to the outer wall of the pressure relief needle 733 .

[0052] The top of the pressure plate 731 is fixedly connected to the bottom of the feeding structure 73 of the assembly. When the processing starts, the injection molding machine transports the injection molding material to the bottom mold 4 through the pressure plate 731, and when it is about to be filled, the injection molding material will be in a fully loaded state at the slot. At this time, the pressure plate 731 continues to be lowered, and the pressure plate 731 will drive the pressure relief needle 733 to descend synchronously. The diameter of the pressure relief needle 733 is smaller than the diameter of the pipe in the slot. During the descent, it will drive the excess injection molding liquid to overflow until the soft sealing ring of the pressure relief needle 733 is sealed with the pipe mouth in the slot. At this time, the excess overflowed injection molding liquid will fall on the top of the spacer disk 721. A drainage port is opened on the right side of the interior of the contact plate 711, and the overflowed injection molding liquid will flow out along the drainage port, thereby collecting the excess material, avoiding the generation of burrs, while improving the recovery rate and reducing production costs.

[0053] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An injection mold for preventing mold surface burrs, comprising a moving table (1), characterized in that: The upper end of the movable platform (1) is provided with a base (3) for mounting the mold via a movable assembly (2); A bottom mold (4) is fixed on the top of the base (3), and a demoulding component (6) for demoulding is arranged inside the bottom mold (4); An injection molding mechanism (7) for injection molding is arranged on the top of the bottom mold (4); The injection molding mechanism (7) comprises a contact component (71) for mold closing, a spacing structure (72) and a material feeding structure (73) for pressure relief; The contact component (71) is in limited contact with the top of the bottom mold (4), and the contact component (71) is movably connected to the feeding structure (73) via the spacing structure (72).

2. The injection mold for avoiding mold surface burrs according to claim 1, characterized in that: The moving assembly (2) comprises a moving plate (21) and a cylinder (22); the moving plate (21) is fixed on the top of the moving platform (1); and the cylinder (22) is fixedly installed on the right side of the moving platform (1).

3. The injection mold for avoiding mold surface burrs according to claim 2, characterized in that: The base (3) is slidably connected to the base (3) at the top of the movable plate (21) via a slide rail.

4. The injection mold for avoiding mold surface burrs according to claim 2, characterized in that: The output end of the cylinder (22) is fixedly connected to the right outer wall of the base (3).

5. The injection mold for avoiding mold surface burrs according to claim 1, characterized in that: The demoulding assembly (6) comprises an air pipe (61) and a push rod (62); the push rod (62) is slidably connected to the interior of the bottom mold (4), and the push rod (62) is fixedly installed with the air pipe (61); and the air pipe (61) is fixedly installed on the front side of the bottom mold (4).

6. The injection mold for avoiding mold surface burrs according to claim 1, characterized in that: The contact assembly (71) comprises a contact plate (711) and a cover plate (712), wherein the cover plate (712) is fixed at the bottom center of the contact plate (711), and the bottom end of the contact plate (711) is in contact with the top of the bottom mold (4).

7. The injection mold for avoiding mold surface burrs according to claim 6, characterized in that: The spacing structure (72) comprises a spacing disk (721) and a retractable rod (722); the spacing disk (721) is placed on the top of the cover plate (712) and sleeved thereon; and the retractable rod (722) is fixed on the top of the contact plate (711).

8. The injection mold for avoiding mold surface burrs according to claim 1, characterized in that: The feeding structure (73) comprises a pressure plate (731), a feed tray (732) and a pressure relief needle (733); the feed tray (732) is fixed at the bottom center of the pressure plate (731); the pressure relief needle (733) is evenly distributed at the bottom of the feed tray (732); and a soft sealing ring is fixed on the outer wall of the pressure relief needle (733).

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