Precise plastic mold capable of rapidly demolding

Abstract

The utility model discloses a precise plastic mold capable of quickly demolding. The precise plastic mold comprises a top plate, a front mold plate, a rear mold plate, a bottom plate, a rotary core-pulling assembly and an ejector pin assembly, a cavity insert is arranged at the bottom of the front mold plate, a core insert is arranged at the top of the rear mold plate, a forming cavity used for injection molding of a product is formed between the cavity insert and the core insert, and the rotary core pulling assembly is arranged in the forming cavity and comprises a push-pull air cylinder, a straight rack, an arc-shaped rack, a rotating shaft and a first inner core. The first inner core of the rotary core-pulling assembly is used for stretching into the forming cavity so as to be used for forming an arc-shaped position of a product, and when the product needs to be demolded after injection molding is completed, the push-pull air cylinder can drive the spur rack to do telescopic movement so as to drive the arc-shaped rack to rotate, so that the first inner core is controlled to be pulled out of the forming cavity; and then the formed product can be ejected out of the forming cavity by the ejector pin assembly, so that the demolding process is completed, the whole core-pulling demolding process is rapid in action, and the production efficiency of the product is effectively improved.

Description

Technical Field

[0001] The utility model relates to the field of injection molds, in particular to a precise plastic mold capable of rapid demoulding. Background Art

[0002] Injection molds are tools for producing plastic products, and they are also tools for giving plastic products a complete structure and precise dimensions; injection molding is a processing method used in mass production of certain parts with complex shapes. Specifically, it refers to the process of injecting heated and melted plastic into the mold cavity under high pressure by an injection molding machine, and obtaining a molded product after cooling and solidification.

[0003] In the prior art, the core-pulling demolding mechanism of the injection mold usually uses a cylinder to drive the core-pulling block to achieve demolding. This core-pulling method can only be used for core-pulling demolding when the core-pulling direction is parallel to the movement direction of the cylinder piston. For plastic products with arc positions inside, the above method will pull the product and damage the mold during the demolding process, resulting in the core-pulling structure of the mold for such products becoming complicated, affecting the demolding efficiency.

[0004] Therefore, the prior art has defects and needs to be improved. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a precise plastic mold which has a simple structure and can be demoulded quickly without pulling up the product during demoulding.

[0006] To achieve this purpose, the utility model adopts the following technical solutions: a precision plastic mold capable of rapid demoulding, comprising a top plate, a front mold plate, a rear mold plate, a bottom plate, a rotating core pulling assembly and an ejector pin assembly;

[0007] The top plate is arranged on the top of the front template, the rear template is arranged below the front template, and the bottom of the rear template is connected to the bottom plate through a mold foot;

[0008] A cavity insert is provided at the bottom of the front template, a core insert is provided at the top of the rear template, a molding cavity for injection molding products is formed between the cavity insert and the core insert, and the rotary core pulling assembly is arranged in the molding cavity;

[0009] The ejector assembly is arranged between the rear template and the bottom plate, and is used to eject the product after injection molding upwards;

[0010] The rotary core pulling assembly includes a push-pull cylinder, a straight rack, an arc-shaped rack, a rotating shaft and a first inner core, wherein the rotating shaft is located on the rear template, the arc-shaped rack is sleeved on the rotating shaft, and the first inner core is located on one end of the arc-shaped rack, and the first inner core is used to extend into the molding cavity or be pulled out from the molding cavity as the arc-shaped rack rotates;

[0011] The spur rack is arranged at the side end of the arc-shaped rack, and the spur rack is meshingly connected with the arc-shaped rack. The push-pull cylinder is arranged on the side wall of the rear template, and its movable end is connected with the spur rack to drive the spur rack to move telescopically.

[0012] By adopting the above-mentioned technical solutions, in the precision plastic mold capable of rapid demoulding, the arc-shaped rack includes a sleeve portion and an arc-shaped tooth portion connected to the sleeve portion;

[0013] The sleeve portion is connected to the rotating shaft via a key, and the arc-shaped tooth portion is meshedly connected to the spur rack.

[0014] By adopting the above-mentioned technical solutions, in the precision plastic mold capable of rapid demoulding, the upper end surface and the lower end surface of the arc-shaped tooth portion are respectively provided with arc-shaped wear-resistant plates.

[0015] By adopting the above-mentioned technical solutions, in the precision plastic mold capable of rapid demoulding, the rear mold plate is provided with a first slide groove for allowing the spur rack to perform telescopic movement.

[0016] By adopting the above-mentioned technical solutions, the precision plastic mold capable of rapid demoulding further comprises a lateral core pulling assembly, wherein the lateral core pulling assembly comprises a slide seat, a guide column and a second inner core;

[0017] A second slide groove is provided on the rear template at the side end of the core insert, the slide seat is arranged in the second slide groove, an inclined hole is provided in the middle of the slide seat, an inclined surface structure adapted to the shape of the inclined hole is provided at the bottom of the guide column, and the top of the guide column is connected to the front template, and the guide column is used to drive the slide seat to move along the second slide groove as the front template moves up and down;

[0018] The second inner core is arranged on the side wall of the slide seat close to the core insert, and the second inner core is used to extend into the molding cavity or be drawn out from the molding cavity as the slide seat moves.

[0019] By adopting the above-mentioned technical solutions, the precision plastic mold capable of rapid demoulding further comprises side baffles, which are arranged on both sides of the second slide groove and abut against the side walls of the slide seat.

[0020] By adopting the above-mentioned technical solutions, the precision plastic mold that can be demolded quickly also includes a limit rod, which is arranged at the bottom of the front template above the second slide groove, and the bottom of the limit rod is exposed downward from the front template. The limit rod is used to limit the slide seat from slipping out of the second slide groove.

[0021] By adopting the above-mentioned technical solutions, the precision plastic mold that can be demolded quickly also includes a first guide column, four of which are arranged between the front template and the rear template, and the first guide column is used to guide the front template to move vertically up and down.

[0022] By adopting the above-mentioned technical solutions, in the precision plastic mold capable of rapid demoulding, the ejector assembly comprises an ejector plate, an ejector, a spring and a second guide column;

[0023] The ejector plate is arranged between the rear template and the bottom plate, the bottom of the second guide column is connected to the ejector plate, a penetrating guide hole is arranged on the rear template, the second guide column can reciprocate along the guide hole, and the spring is arranged between the ejector plate and the rear template;

[0024] The bottoms of the ejector pins are arranged on the ejector plate, and the tops of the ejector pins pass through the rear template from bottom to top and are located in the molding cavity. The ejector pins are used to eject the injection molded product from the molding cavity as the ejector plate moves upward.

[0025] Compared with the prior art, the utility model has the following beneficial effects:

[0026] The first inner core of the rotary core-pulling assembly of the utility model is used to extend into the molding cavity to form an arc-shaped position of the product. When the product needs to be demolded after injection molding, the push-pull cylinder can drive the spur rack to telescopically move, thereby driving the arc-shaped rack to rotate, so as to control the first inner core to be pulled out of the molding cavity, and then the molded product can be ejected from the molding cavity by the ejector assembly, thereby completing the demolding process. The entire core-pulling and demolding process is fast, and the production efficiency of the product is effectively improved. A first sliding groove for the telescopic movement of the spur rack is provided on the rear template, thereby improving the movement stability of the spur rack, so that the spur rack can maintain a smooth movement trajectory during the telescopic process, and avoid the first inner core from being offset due to unstable movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] 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 description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0028] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed by the present invention.

[0029] Figure 1 It is a schematic diagram of the explosion structure of the utility model;

[0030] Figure 2 This is a schematic diagram of the installation structure of the rotary core pulling assembly of the utility model;

[0031] Figure 3 This is a schematic diagram of the structure of the rotary core pulling assembly of the utility model;

[0032] Figure 4 This is a schematic diagram of the arc-shaped rack assembly structure of the utility model;

[0033] Figure 5 This is a schematic diagram of the structure of the lateral core pulling assembly of the utility model;

[0034] Figure 6 This is a schematic diagram of the structure of the ejector pin assembly of the utility model. DETAILED DESCRIPTION

[0035] In order to make the utility model's purpose, features, and advantages more obvious and easy to understand, the following will be combined with the drawings in the utility model embodiments to clearly and completely describe the technical solutions in the utility model embodiments. Obviously, the embodiments described below are only part of the utility model embodiments, not all of the embodiments. Based on the embodiments in 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.

[0036] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally arranged component at the same time.

[0037] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0038] like Figures 1 to 6 As shown, the embodiment of the utility model provides a precision plastic mold that can be quickly demoulded, including a top plate 1, a front template 2, a rear template 3, a bottom plate 4, a rotating core pulling assembly 5 and an ejector assembly 6; the top plate 1 is arranged on the top of the front template 2, the rear template 3 is arranged below the front template 2, and the bottom of the rear template 3 is connected to the bottom plate 4 through a mold foot 7; a cavity insert 21 is provided at the bottom of the front template 2, and a core insert 31 is provided at the top of the rear template 3, a molding cavity for injection molding products is formed between the cavity insert 21 and the core insert 31, and the rotating core pulling assembly 5 is provided at the bottom of the front template 2. The rotating core pulling assembly 5 is arranged in the molding cavity; the ejector assembly 6 is arranged between the rear template 3 and the bottom plate 4, and the ejector assembly 6 is used to eject the product after injection molding upward; the molding cavity is a space formed between the cavity insert 21 and the core insert 31, which can accommodate the injection molding material in a molten state and form the appearance of the product. The rotating core pulling assembly 5 is located in the molding cavity. When the product is completed by injection molding, the rotating core pulling assembly 5 can pull the arc-shaped inner core of the product out of the product through a rotating action, so that the ejector assembly 6 can quickly eject the product from the molding cavity during demolding.

[0039] like Figures 1 to 4 As shown, the rotary core-pulling assembly 5 includes a push-pull cylinder 51, a spur rack 52, an arc-shaped rack 53, a rotating shaft 54 ​​and a first inner core 55. The rotating shaft 54 ​​is located on the rear template 3, the arc-shaped rack 53 is sleeved on the rotating shaft 54, the first inner core 55 is arranged on one end of the arc-shaped rack 53, and the first inner core 55 is used to extend into the molding cavity or be pulled out from the molding cavity as the arc-shaped rack 53 rotates. The spur rack 52 is arranged at the side end of the arc-shaped rack 53, and the spur rack 52 is connected to the arc-shaped rack 53 by meshing. The push-pull cylinder 51 is arranged on the side wall of the rear template 3, and its movable end is connected to the spur rack 52 to drive the spur rack 52 to telescopically move. In this embodiment, the first inner core 55 is used to extend into the molding cavity to form the arc position of the molded product. When the product needs to be demolded after injection molding, the push-pull cylinder 51 can drive the spur rack 52 to telescopically move, thereby driving the arc rack 53 to rotate, thereby controlling the first inner core 55 to be withdrawn from the molding cavity, and then the molded product can be ejected from the mold, thereby completing the demolding process. The entire process is executed quickly, effectively improving the demolding efficiency of the product.

[0040] like Figure 4As shown, further, the arc-shaped rack 53 includes a sleeve portion 531 and an arc-shaped tooth portion 532 connected to the sleeve portion 531, the sleeve portion 531 is connected to the rotating shaft 54 ​​via a key, the arc-shaped tooth portion 532 is meshedly connected to the spur rack 52, and the sleeve portion 531 is connected to the rotating shaft 54 ​​via a key. Such an arrangement can improve the connection stability between the arc-shaped rack 53 and the rotating shaft 54.

[0041] like Figures 2 to 4 As shown, further, the upper end face and the lower end face of the arc-shaped tooth portion 532 are respectively provided with an arc-shaped wear-resistant plate 56. Since the arc-shaped rack 53 is prone to frequent contact with the surfaces of the front template 2 and the rear template 3 during rotation, the upper end face and the lower end face of the arc-shaped tooth portion 532 are prone to wear. The provision of the arc-shaped wear-resistant plate 56 can effectively reduce wear, thereby extending the service life of the mold.

[0042] like Figure 2 As shown, further, the rear template 3 is provided with a first slide groove 32 for the spur rack 52 to perform telescopic movement. The setting of the first slide groove 32 can increase the movement stability of the spur rack 52, so that the spur rack 52 can maintain a smooth movement trajectory during the telescopic process, avoiding the displacement of the first inner core 55 due to unstable movement.

[0043] like Figure 2 , Figure 5 and Figure 6 As shown, further, it also includes a lateral core pulling component 8, the lateral core pulling component 8 includes a slide 81, a guide column 82 and a second inner core 83, a second slide groove 33 is provided on the rear template 3 at the side end of the core insert 31, the slide 81 is arranged in the second slide groove 33, an inclined hole 810 is provided in the middle of the slide 81, and a slope structure 821 adapted to the shape of the inclined hole 810 is provided at the bottom of the guide column 82, the top of the guide column 82 is connected to the front template 2, the guide column 82 is used to drive the slide 81 to move along the second slide groove 33 as the front template 2 moves up and down, the second inner core 83 is provided on the side wall of the slide 81 close to the core insert 31, and the second inner core 83 is used to extend into the molding cavity or be drawn out from the molding cavity as the slide 81 moves. In this embodiment, the first inner core 55 is used to extend into the molding cavity for the inner hole position of the molding product. When the product needs to be demolded after injection molding, the guide column 82 can move upward with the rise of the front template 2. With the cooperation of the inclined structure 821 at the bottom of the guide column 82 and the inclined hole 810 of the slide seat 81, the slide seat 81 can be pushed to move in the direction away from the molding cavity, thereby pulling the first inner core 55 out of the molding cavity, thereby realizing core pulling and demolding.

[0044] like Figure 5As shown, further, side baffles 84 are included, which are arranged on both sides of the second slide groove 33 and abut against the side walls of the slide seat 81. The side baffles 84 can play a role in positioning and stabilizing the slide seat 81, preventing the slide seat 81 from deflecting or shaking during movement, thereby improving the movement accuracy of the second inner core 83.

[0045] like Figure 5 and Figure 6 As shown, further, it also includes a limit rod 85, which is arranged at the bottom of the front template 2 above the second slide groove 33, and the bottom of the limit rod 85 is exposed downward from the front template 2. The limit rod 85 is used to limit the slide seat 81 from slipping out of the second slide groove 33 to play a limiting protection role.

[0046] like Figure 1 As shown, further, a first guide column 9 is included, and four first guide columns 9 are arranged between the front template 2 and the rear template 3, and the first guide columns 9 are used to guide the front template 2 to move vertically up and down. The arrangement of the first guide columns 9 can achieve accurate alignment between the front template 2 and the rear template 3, avoiding affecting the injection molding accuracy of the product due to inaccurate alignment.

[0047] like Figure 6 As shown, further, the ejector assembly 6 includes an ejector plate 61, an ejector 62, a spring 63 and a second guide column 64, the ejector plate 61 is arranged between the rear template 3 and the bottom plate 4, the bottom of the second guide column 64 is connected to the ejector plate 61, the rear template 3 is provided with a penetrating guide hole, the second guide column 64 can reciprocate along the guide hole, the spring 63 is arranged between the ejector plate 61 and the rear template 3, the bottom of a plurality of ejector pins 62 is arranged on the ejector plate 61, and the top of the ejector pin 62 passes through the rear template 3 from bottom to top and is located in the molding cavity, and the ejector pin 62 is used to eject the injection molded product from the molding cavity as the ejector plate 61 moves upward. When the injection molding is completed, the ejector plate 61 moves upward under the push of the external push rod mechanism, so as to drive the ejector pin 62 to rise and contact the product at the same time. As the ejector plate 61 continues to move upward, the ejector pin 62 applies pressure to eject the product from the molding cavity, thereby completing the demolding operation. The setting of the second guide column 64 can improve the stability of the up and down movement of the ejector plate 61.

[0048] As described above, the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model 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 can still be modified, or some of the technical features can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A precision plastic mold that can be demoulded quickly, characterized in that: It includes a top plate, a front template, a rear template, a bottom plate, a rotating core pulling assembly and an ejector pin assembly; The top plate is arranged on the top of the front template, the rear template is arranged below the front template, and the bottom of the rear template is connected to the bottom plate through a mold foot; A cavity insert is provided at the bottom of the front template, a core insert is provided at the top of the rear template, a molding cavity for injection molding products is formed between the cavity insert and the core insert, and the rotary core pulling assembly is arranged in the molding cavity; The ejector assembly is arranged between the rear template and the bottom plate, and is used to eject the product after injection molding upwards; The rotary core pulling assembly includes a push-pull cylinder, a straight rack, an arc-shaped rack, a rotating shaft and a first inner core, wherein the rotating shaft is located on the rear template, the arc-shaped rack is sleeved on the rotating shaft, and the first inner core is located on one end of the arc-shaped rack, and the first inner core is used to extend into the molding cavity or be pulled out from the molding cavity as the arc-shaped rack rotates; The spur rack is arranged at the side end of the arc-shaped rack, and the spur rack is meshingly connected with the arc-shaped rack. The push-pull cylinder is arranged on the side wall of the rear template, and its movable end is connected with the spur rack to drive the spur rack to move telescopically.

2. The precision plastic mold capable of rapid demoulding according to claim 1, characterized in that: The arc-shaped rack includes a sleeve portion and an arc-shaped tooth portion connected to the sleeve portion; The sleeve portion is connected to the rotating shaft via a key, and the arc-shaped tooth portion is meshedly connected to the spur rack.

3. The precision plastic mold capable of rapid demoulding according to claim 2, characterized in that: The upper end surface and the lower end surface of the arc-shaped tooth portion are respectively provided with an arc-shaped wear-resistant plate.

4. The precision plastic mold capable of rapid demoulding according to claim 1, characterized in that: The rear template is provided with a first sliding groove for allowing the spur rack to move telescopically.

5. The precision plastic mold capable of rapid demoulding according to claim 1, characterized in that: Also included is a lateral core pulling assembly, which includes a slide seat, a guide column and a second inner core; A second slide groove is provided on the rear template at the side end of the core insert, the slide seat is arranged in the second slide groove, an inclined hole is provided in the middle of the slide seat, an inclined surface structure adapted to the shape of the inclined hole is provided at the bottom of the guide column, and the top of the guide column is connected to the front template, and the guide column is used to drive the slide seat to move along the second slide groove as the front template moves up and down; The second inner core is arranged on the side wall of the slide seat close to the core insert, and the second inner core is used to extend into the molding cavity or be drawn out from the molding cavity as the slide seat moves.

6. The precision plastic mold capable of rapid demoulding according to claim 5, characterized in that: It also includes side baffles, which are arranged on both sides of the second slide groove and abut against the side walls of the slide seat.

7. The precision plastic mold capable of rapid demoulding according to claim 5, characterized in that: It also includes a limiting rod, which is arranged at the bottom of the front template above the second slide groove, and the bottom of the limiting rod is exposed downward from the front template. The limiting rod is used to limit the slide seat from slipping out of the second slide groove.

8. The precision plastic mold capable of rapid demoulding according to claim 1, characterized in that: It also includes first guide posts, four of which are arranged between the front template and the rear template, and are used to guide the front template to move vertically up and down.

9. The precision plastic mold capable of rapid demoulding according to claim 1, characterized in that: The ejector assembly includes an ejector plate, an ejector, a spring and a second guide column; The ejector plate is arranged between the rear template and the bottom plate, the bottom of the second guide column is connected to the ejector plate, a penetrating guide hole is arranged on the rear template, the second guide column can reciprocate along the guide hole, and the spring is arranged between the ejector plate and the rear template; The bottoms of the ejector pins are arranged on the ejector plate, and the tops of the ejector pins pass through the rear template from bottom to top and are located in the molding cavity. The ejector pins are used to eject the injection molded product from the molding cavity as the ejector plate moves upward.

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