Automobile accessory automatic injection molding device facilitating demolding

Abstract

The application relates to the technical field of injection mold stripping, and particularly relates to an automatic injection molding device for automobile parts which is convenient to strip, a side mold block is composed of a mold body part, a transition connecting part and a sliding block part, an upward installation groove is formed in the bottom of the mold body part, a rectangular through hole which is communicated with the installation groove is arranged at the center of a rectangular convex mold block, an elastic push strip, a groove positioner for guiding the elastic push strip to stretch out of the rectangular through hole in an oblique upward direction and a magnetic repulsion mechanism for pushing the elastic push strip outwards are arranged in the installation groove, a switch mechanism for starting the magnetic repulsion mechanism is arranged between the sliding block part and a limiting block, the magnetic repulsion mechanism comprises a cylindrical electromagnet and a circular magnet, and an enlarged part which is consistent with the wall thickness of an injection molding part is arranged at the outer end of the elastic push strip. The application can complete the stripping of the injection molding part in the process of mold opening, thereby effectively avoiding the defects of poor appearance and internal surface injection quality caused by traditional ejector pins.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of injection mold stripping, in particular to an automatic injection molding device for automobile parts facilitating stripping. BACKGROUND

[0002] A plastic mold is a tool used in the plastics processing industry and matched with a plastics forming machine to give a complete configuration and accurate size to a plastic product. Due to the variety of plastic products and processing methods, the structure of the plastics forming machine and the plastic product is various, and the types and structures of the plastic mold are also various.

[0003] The plastic mold is a tool for producing plastic products, which is composed of several parts, and the combination has a forming cavity. During injection molding, the mold is clamped on the injection molding machine, the molten plastic is injected into the forming cavity, and then the mold is opened, the product is ejected from the cavity through the ejection system, and finally the mold is closed for the next injection molding. The whole injection molding process is cyclic.

[0004] At present, the ejection system of the mold is mostly needle type, the needle is arranged at the center of the lower mold, and is responsible for vertically upwardly ejecting the injection molded part after injection molding. However, since the top of the needle is directly connected with the cavity, that is, the top surface of the needle directly contacts the inner wall of the injection molded part during injection molding, therefore, there are several circular spots similar to the water gap on the inner wall of the injection molded product, which directly affects the appearance quality of the product. In addition, as the needle is continuously worn, the gap between the needle and the hole wall of the mold gradually increases, and a sharp thin water gap-shaped protrusion is gradually formed at the circular spot. In this case, the inner surface of the injection molded part after stripping needs to be treated to remove the water gap, which increases the processing procedure of the injection molded part. In addition, many injection molded parts have side wall openings, and a side mold needs to be added. The side mold translates with the upper mold through the inclined pin structure. Due to the existence of assembly tolerance, the side mold and the side wall of the center mold column are not tightly fitted, which further causes poor forming quality of the side wall opening of the injection molded part. SUMMARY

[0005] Therefore, it is necessary to provide an automatic injection molding device for automobile parts facilitating stripping, which can complete the stripping of the injection molded part during mold opening, thereby effectively avoiding the poor appearance and inner surface injection quality caused by the traditional needle.

[0006] To solve the problems in the prior art, the technical scheme adopted by the application is as follows:

[0007] The utility model provides an automobile accessory automatic injection molding device of easy demoulding, including upper die seat and lower die seat, upper die seat and lower die seat are equipped with upper die and lower die respectively, the lower die is embedded with two inner die columns for forming the inner wall of injection molding part, both sides of each inner die column are provided with the side mould for forming the side wall of injection molding part, the side mould is slidably arranged in the lower die seat, the upper die seat is provided with a plurality of inclined pin columns for driving the side mould close to the inner die column during the clamping process, each side mould is provided with an inclined through hole for matching the inclined pin column, the both sides of lower die seat are further fixedly provided with a plurality of limiting blocks for limiting the side mould during the opening process, the side of the side mould and the inner die column is provided with two rectangular convex moulds for forming the rectangular opening of the side wall of injection molding part, the side mould is composed of mould body part, transition connecting part and sliding block part, the mould body part and the sliding block part are located at both sides of the transition connecting part, the upper end of the transition connecting part is connected with one end of the mould body part, and the lower end is connected with one end of the sliding block part, the sliding block part is slidably connected with the lower die seat, the rectangular convex mould is formed on the end side wall of the mould body part away from the sliding block part, the inclined through hole is formed on the sliding block part, the bottom of the mould body part is formed with an upward installation groove, the center of the rectangular convex mould is provided with a rectangular through hole connected to the installation groove, the installation groove is provided with an elastic push strip, a groove positioner for guiding the elastic push strip to obliquely extend out of the rectangular through hole and a magnetic repulsion mechanism for pushing the elastic push strip outwards, the sliding block part and the limiting block are provided with a switch mechanism for starting the magnetic repulsion mechanism;

[0008] The magnetic repulsion mechanism includes a cylindrical electromagnet fixed in the transition connecting part and a circular magnet connected with the two elastic push strips, when the magnetic repulsion mechanism works, the circular magnet is separated from the cylindrical electromagnet, and when the magnetic repulsion mechanism is powered off, the circular magnet is attracted to the cylindrical electromagnet.

[0009] The outer end of the elastic push strip is provided with a thickened part consistent with the wall thickness of the injection molding part.

[0010] Further, the groove positioner includes a U-shaped upper groove block, a U-shaped lower groove block and a strip-shaped connecting plate, the two ends of the U-shaped upper groove block and the U-shaped lower groove block are embedded in the rectangular through hole, the top of the U-shaped lower groove block located in the inner part of the installation groove is formed with two symmetrical pads, the bottom of the U-shaped upper groove block is fixedly connected to the top of the pads, the height of the pad is greater than the thickness of the elastic push strip, the U-shaped upper groove block and the U-shaped lower groove block form an accommodation gap on the outside of the two pads for accommodating the elastic push strip, the strip-shaped connecting plate is located on one side of the installation groove close to the cylindrical electromagnet, the two ends of the strip-shaped connecting plate are provided with embedding joints for embedding the elastic push strip, one end of the elastic push strip is fixed through a bolt between the embedding joint, and one side of the strip-shaped connecting plate close to the cylindrical electromagnet is provided with a sunken groove for embedding the circular magnet.

[0011] Further, the front end of the U-shaped upper groove block is formed with an inclined corner part for guiding the end of the elastic push strip close to the thickened part, and the front end of the U-shaped lower groove block is formed with an inclined corner step part for matching the inclined corner part to jointly accommodate the thickened part.

[0012] Further, a limiting filler is arranged in the mounting groove, one end of the limiting filler is tightly attached to one side wall of the mounting groove, and the other end is tightly attached to the same end of the U-shaped upper groove block and the U-shaped lower groove block, the top of one end of the limiting filler is formed with a supporting groove for supporting the sliding and translation of the strip-shaped connecting plate, both ends of the side of the strip-shaped connecting plate away from the cylindrical electromagnet are formed with a pair of limiting pressure plates, each pair of limiting pressure plates is located above and below the caulking joint, the spacing between each pair of limiting pressure plates is consistent with the spacing of the caulking joint, the width of the limiting pressure plate is less than half the width of the elastic push strip, the top of both sides of the limiting filler is fixedly connected with a cover plate for downwardly pressing the elastic push strip, and the top of the limiting filler and the bottom of the cover plate are formed with accommodating grooves for accommodating the translation of the limiting pressure plate.

[0013] Further, a positioning shaft is fixedly clamped between the U-shaped upper groove block and the U-shaped lower groove block, the positioning shaft is sleeved with a first spring, and the two ends of the first spring are tightly attached to the strip-shaped connecting plate and the U-shaped lower groove block, respectively.

[0014] Further, the top of the transition connecting part is formed with a deep groove extending downward and communicating with the mounting groove, one side of the deep groove away from the mold body part is formed with a rectangular limiting insertion groove, the tail of the cylindrical electromagnet is fixedly connected with a rectangular back plate, the rectangular back plate is located in the lower half of the rectangular limiting insertion groove, and the upper half of the deep groove is fixedly embedded with a closed embedding block for tightly pressing the rectangular back plate in the deep groove.

[0015] Further, the rectangular back plate is provided with an avoiding notch for the wiring of the cylindrical electromagnet, the transition connecting part is formed with a wire passing through hole corresponding to the avoiding notch, and the transition connecting part and the sliding block part are both provided with wire grooves for the wiring of the cylindrical electromagnet to the switch mechanism.

[0016] Further, the switch mechanism comprises a spring needle small plate and a contact small plate, the outer end side wall of the sliding block part is provided with a mounting hole for mounting the spring needle small plate, and the contact small plate is mounted on the limiting block and is arranged corresponding to the spring needle small plate.

[0017] Further, the side of the transition connecting part close to the sliding block part is inclined to be arranged on the upper die seat, a transverse through groove is formed in the side wall, a first strip-shaped magnet is fixedly embedded in the transverse through groove, one end of the wire groove is located at the groove bottom of the transverse through groove, and the upper die seat is provided with a second strip-shaped magnet corresponding to the first strip-shaped magnet.

[0018] Further, the bottom of the sliding block part is provided with a limiter, the limiter comprises a seat body, a floating body movably arranged in the seat body and a second spring arranged in the floating body, a circular through hole for the floating body to leak upward is formed in the top of the seat body, the second spring is used for upwardly abutting against the floating body, the top of the floating body is formed with a limiting three-rib, the bottom of the sliding block part is formed with a first positioning hole and a second positioning hole corresponding to the open mold state and the closed mold state respectively, and the width of the second positioning hole is greater than that of the first positioning hole.

[0019] Compared with the prior art, the present application has the beneficial effects that:

[0020] Firstly, the present application can effectively realize the demolding of the injection molded part with the open side wall without the ejector pin, thereby ensuring the forming quality of the inner wall of the injection molded part.

[0021] Secondly, the present application realizes the demolding process by arranging the elastic pushing rib of the magnetic outward pushing in the side mold to extend into the open side wall of the injection molded part and to push it upward, and the whole process is smooth and efficient.

[0022] Thirdly, the present application ensures the quality of the open side wall of the injection molded part by applying the magnetic repulsive force to the side mold after the mold is closed. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a schematic diagram of the three-dimensional structure of the present application;

[0024] Figure 2 is a schematic diagram of the exploded three-dimensional structure of the present application;

[0025] Figure 3 is a schematic diagram of the partial exploded three-dimensional structure of the present application;

[0026] Figure 4 is a schematic diagram of the three-dimensional structure of the side mold block and the inner mold column of the present application;

[0027] Figure 5 is a partial sectional view of the present application;

[0028] Figure 6 is a schematic diagram of the exploded three-dimensional structure of the side mold block and the inner mold column of the present application;

[0029] Figure 7 is a schematic diagram of the three-dimensional structure of the side mold block of the present application Figure 1 ;

[0030] Figure 8 is an enlarged schematic diagram of the structure at A in Figure 5 ;

[0031] Figure 9 is a schematic diagram of the three-dimensional structure of the side mold block of the present application Figure 2 ;

[0032] Figure 10 is a perspective exploded view of the side module of the present application Figure 1 ;

[0033] Figure 11 is a perspective exploded view of the side module of the present application Figure 2 ;

[0034] Figure 12 is a plane schematic view of the side module of the present application;

[0035] Figure 13 is a sectional view along the line B-B in Figure 12 ;

[0036] Figure 14 is a sectional view along the line C-C in Figure 12 ;

[0037] Figure 15 is a perspective structural schematic view of the elastic push strip, slot positioner and magnetic repulsion mechanism of the present application;

[0038] Figure 16 is a perspective structural exploded schematic view of the elastic push strip, slot positioner and magnetic repulsion mechanism of the present application;

[0039] The figure reference is: 1, injection molding part; 2, upper die holder; 3, lower die holder; 4, upper die core; 5, lower die core; 6, inner die column; 7, inclined pin column; 8, inclined through hole; 9, limit block; 10, rectangular convex module; 11, side module; 12, die body part; 13, transition connection part; 14, slider part; 15, mounting slot; 16, rectangular through hole; 17, elastic push strip; 18, cylindrical electromagnet; 19, circular magnet; 20, thickened part; 21, U-shaped upper slot block; 22, U-shaped lower slot block; 23, strip-shaped connecting plate; 24, pad; 25, containing gap; 26, caulking; 27, sink; 28, bevel part; 29, bevel step part; 30, limit filler block; 31, bracket slot; 32, limit pressing plate; 33, cover plate; 34, containing slot; 35, positioning shaft; 36, first spring; 37, deep slot; 38, rectangular limit insertion slot; 39, rectangular back plate; 40, closed embedded block; 41, avoidance notch; 42, threading through hole; 43, wire slot; 44, spring thimble plate; 45, contact plate; 46, transverse through slot; 47, first strip-shaped magnet; 48, second strip-shaped magnet; 49, seat body; 50, float body; 51, second spring; 52, circular through hole; 53, limit three-edged strip; 54, first positioning hole; 55, second positioning hole; 56, rectangular opening; 57, mounting hole. DETAILED DESCRIPTION

[0040] In order to further understand the features, technical means and achieved specific purposes and functions of the present application, the present application is described in further detail below in combination with the drawings and specific embodiments.

[0041] Referring to Figures 1 to 16 The utility model provides an automobile accessory automatic injection molding device of facilitating demolding, including upper die seat 2 and lower die seat 3, upper die seat 2 and lower die seat 3 are equipped with upper die core 4 and lower die core 5 respectively, two inner die columns 6 for forming the inner wall of injection molding piece 1 are embedded in lower die core 5, the both sides of each inner die column 6 are provided with side die block 11 for forming the side wall of injection molding piece 1, side die block 11 is slidably arranged in lower die seat 3, upper die seat 2 is provided with several inclined pin columns 7 for driving side die block 11 close to inner die column 6 during clamping, inclined through hole 8 for cooperating with inclined pin column 7 is arranged on each side die block 11, the both sides of lower die seat 3 are also fixedly provided with several limiting blocks 9 for limiting side die block 11 during unclamping, the side of side die block 11 close to inner die column 6 is provided with two rectangular convex die blocks 10 (as shown in Figure 6 The utility model provides an automobile accessory automatic injection molding device of facilitating demolding, including upper die seat 2 and lower die seat 3, upper die seat 2 and lower die seat 3 are equipped with upper die core 4 and lower die core 5 respectively, two inner die columns 6 for forming the inner wall of injection molding piece 1 are embedded in lower die core 5, the both sides of each inner die column 6 are provided with side die block 11 for forming the side wall of injection molding piece 1, side die block 11 is slidably arranged in lower die seat 3, upper die seat 2 is provided with several inclined pin columns 7 for driving side die block 11 close to inner die column 6 during clamping, inclined through hole 8 for cooperating with inclined pin column 7 is arranged on each side die block 11, the both sides of lower die seat 3 are also fixedly provided with several limiting blocks 9 for limiting side die block 11 during unclamping, the side of side die block 11 close to inner die column 6 is provided with two rectangular convex die blocks 10 (as shown in Figure 11 The utility model provides an automobile accessory automatic injection molding device of facilitating demolding, including upper die seat 2 and lower die seat 3, upper die seat 2 and lower die seat 3 are equipped with upper die core 4 and lower die core 5 respectively, two inner die columns 6 for forming the inner wall of injection molding piece 1 are embedded in lower die core 5, the both sides of each inner die column 6 are provided with side die block 11 for forming the side wall of injection molding piece 1, side die block 11 is slidably arranged in lower die seat 3, upper die seat 2 is provided with several inclined pin columns 7 for driving side die block 11 close to inner die column 6 during clamping, inclined through hole 8 for cooperating with inclined pin column 7 is arranged on each side die block 11, the both sides of lower die seat 3 are also fixedly provided with several limiting blocks 9 for limiting side die block 11 during unclamping, the side of side die block 11 close to inner die column 6 is provided with two rectangular convex die blocks 10 (as shown in

[0042] The utility model provides an automobile accessory automatic injection molding device of facilitating demolding, including upper die seat 2 and lower die seat 3, upper die seat 2 and lower die seat 3 are equipped with upper die core 4 and lower die core 5 respectively, two inner die columns 6 for forming the inner wall of injection molding piece 1 are embedded in lower die core 5, the both sides of each inner die column 6 are provided with side die block 11 for forming the side wall of injection molding piece 1, side die block 11 is slidably arranged in lower die seat 3, upper die seat 2 is provided with several inclined pin columns 7 for driving side die block 11 close to inner die column 6 during clamping, inclined through hole 8 for cooperating with inclined pin column 7 is arranged on each side die block 11, the both sides of lower die seat 3 are also fixedly provided with several limiting blocks 9 for limiting side die block 11 during unclamping, the side of side die block 11 close to inner die column 6 is provided with two rectangular convex die blocks 10 (as shown in Figure 14 The utility model provides an automobile accessory automatic injection molding device of facilitating demolding, including upper die seat 2 and lower die seat 3, upper die seat 2 and lower die seat 3 are equipped with upper die core 4 and lower die core 5 respectively, two inner die columns 6 for forming the inner wall of injection molding piece 1 are embedded in lower die core 5, the both sides of each inner die column 6 are provided with side die block 11 for forming the side wall of injection molding piece 1, side die block 11 is slidably arranged in lower die seat 3, upper die seat 2 is provided with several inclined pin columns 7 for driving side die block 11 close to inner die column 6 during clamping, inclined through hole 8 for cooperating with inclined pin column 7 is arranged on each side die block 11, the both sides of lower die seat 3 are also fixedly provided with several limiting blocks 9 for limiting side die block 11 during unclamping, the side of side die block 11 close to inner die column 6 is provided with two rectangular convex die blocks 10 (as shown in

[0043] The utility model provides an automobile accessory automatic injection molding device of facilitating demolding, including upper die seat 2 and lower die seat 3, upper die seat 2 and lower die seat 3 are equipped with upper die core 4 and lower die core 5 respectively, two inner die columns 6 for forming the inner wall of injection molding piece 1 are embedded in lower die core 5, the both sides of each inner die column 6 are provided with side die block 11 for forming the side wall of injection molding piece 1, side die block 11 is slidably arranged in lower die seat 3, upper die seat 2 is provided with several inclined pin columns 7 for driving side die block 11 close to inner die column 6 during clamping, inclined through hole 8 for cooperating with inclined pin column 7 is arranged on each side die block 11, the both sides of lower die seat 3 are also fixedly provided with several limiting blocks 9 for limiting side die block 11 during unclamping, the side of side die block 11 close to inner die column 6 is provided with two rectangular convex die blocks 10 (as shown in

[0044] After the injection molding part 1 is completely cooled, the upper mold base 2 is connected with the upper mold core 4 and rises upward during the mold opening process. In this process, the side mold block 11 on the lower mold base 3 is driven to move outward by the guiding action of the inclined pin column 7, so that the rectangular convex mold block 10 at the front end of the side mold block 11 is withdrawn from the rectangular opening 56 of the molded injection molding part 1. At this time, the switch mechanism at the rear end of the side mold block 11 is contacted by the limiting block 9, thereby starting the magnetic repulsion mechanism in the side mold block 11. The magnetic repulsion mechanism works, the cylindrical electromagnet 18 generates a magnetic force after being electrified. At this time, the side poles of the cylindrical electromagnet 18 and the circular magnet 19 are the same, thereby generating a magnetic repulsion force. The circular magnet 19 drives the two elastic push strips 17 connected thereto to extend obliquely out of the rectangular through hole 16 along the groove positioner. As shown in Figure 13 and Figure 14 After the elastic push strip 17 extends obliquely upward from the rectangular through hole 16 and reaches the rectangular opening 56 of the injection molding part 1, the thickened part 20 moves upward along the side wall of the inner mold column 6 until it contacts the injection molding part 1 upward. Under the action of the magnetic repulsion force, the injection molding part 1 is subjected to an upward force, thereby separating the injection molding part 1 from the inner mold column 6. After the injection molding part 1 is separated by the short-term work of the cylindrical electromagnet 18, the controller (not shown in the figure) reverses the current of the cylindrical electromagnet 18, thereby reversing the magnetic poles. Alternatively, the controller directly cuts off the current of the cylindrical electromagnet 18 to stop its work. At this time, the circular magnet 19 is adsorbed on the suction disc of the cylindrical electromagnet 18, thereby driving the elastic push strip 17 to reset until the thickened part 20 is retracted into the rectangular through hole 16. Then, the injection molding part 1 can be smoothly taken out.

[0045] In order to realize that the circular magnet 19 can synchronously drive the two elastic push strips 17 to move in the groove positioner, the following features are specifically provided:

[0046] The groove positioner includes a U-shaped upper groove block 21, a U-shaped lower groove block 22, and a strip-shaped connecting plate 23. The two ends of the U-shaped upper groove block 21 and the U-shaped lower groove block 22 are embedded in the rectangular through hole 16. The top of the U-shaped lower groove block 22 located in the inner part of the mounting groove 15 is formed with two symmetrical pad tables 24. The bottom of the U-shaped upper groove block 21 is fixedly connected to the top of the pad table 24. The height of the pad table 24 is greater than the thickness of the elastic push strip 17. The U-shaped upper groove block 21 and the U-shaped lower groove block 22 form a containing gap 25 for accommodating the elastic push strip 17 on the sides of the two pad tables 24. The strip-shaped connecting plate 23 is located on one side of the mounting groove 15 close to the cylindrical electromagnet 18. The two ends of the strip-shaped connecting plate 23 are provided with embedded joints 26 for embedding the elastic push strip 17. One end of the elastic push strip 17 is fixed by a bolt between the embedded joint 26. The side of the strip-shaped connecting plate 23 close to the cylindrical electromagnet 18 is provided with a sunken groove 27 for embedding the circular magnet 19.

[0047] The elastic push strip 17 of the present application adopts an elastic metal sheet with a thickness of 0.8 mm, and the thickness of the accommodating gap 25 is 1 mm, which ensures that the elastic push strip 17 can move freely in the accommodating gap 25 without bending. The ends of the two elastic push strips 17 are embedded in the strip-shaped connecting plate 23 and locked by bolts, which ensures that the strip-shaped connecting plate 23 can drive the two elastic push strips 17 to move in the accommodating gap 25 of the slot positioner under the action of magnetic force.

[0048] In order to ensure that the elastic push strip 17 can smoothly enter the rectangular opening 56 of the injection molding part 1 obliquely and can be completely accommodated in the rectangular through hole 16 of the side mold 11, the following features are specifically provided:

[0049] The front end of the U-shaped upper groove block 21 is formed with a bevel angle part 28 for oblique guiding of one end of the elastic push strip 17 close to the thickened part 20, and the front end of the U-shaped lower groove block 22 is formed with a bevel step part 29 for cooperating with the bevel angle part 28 to accommodate the thickened part 20.

[0050] During the outward pushing process of the elastic push strip 17, the elastic push strip 17 is obliquely guided out of the rectangular through hole 16 under the guiding action of the bevel angle part 28. When the elastic push strip 17 is retracted, the thickened part 20 is accommodated in the space between the bevel angle part 28 and the bevel step part 29, so as to avoid the thickened part 20 being exposed and hindering the upward demolding and taking out process of the injection molding part 1.

[0051] In order to avoid local stress deformation of the elastic push strip 17, which causes the elastic push strip 17 to fail to transmit the pushing force to the injection molding part 1, the following features are specifically provided:

[0052] The mounting groove 15 is further provided with a limiting filler block 30, one end of the limiting filler block 30 is tightly attached to one side wall of the mounting groove 15, and the other end is tightly attached to the same end of the U-shaped upper groove block 21 and the U-shaped lower groove block 22. The top of one end of the limiting filler block 30 is formed with a supporting groove 31 for supporting the sliding and translation of the strip-shaped connecting plate 23. The side away from the cylindrical electromagnet 18 of the strip-shaped connecting plate 23 is formed with a pair of limiting pressure plates 32 at both ends. Each pair of limiting pressure plates 32 is located above and below the caulking 26, and the spacing between each pair of limiting pressure plates 32 is consistent with the spacing of the caulking 26. The width of the limiting pressure plate 32 is less than half the width of the elastic push strip 17. The top of both sides of the limiting filler block 30 is fixedly connected with a cover plate 33 for downward pressing of the elastic push strip 17. The top of the limiting filler block 30 and the bottom of the cover plate 33 are both formed with an accommodating groove 34 for accommodating the translation of the limiting pressure plate 32.

[0053] Since the strip-shaped connecting plate 23 needs to drive the elastic push strip 17 to move horizontally, a sufficient distance for the movement of the strip-shaped connecting plate 23 needs to be reserved between the strip-shaped connecting plate 23 and the U-shaped lower groove block 22, and the elastic push strip 17 on the distance will be bent due to the lack of support on the upper and lower sides, so that the length of the bent elastic push strip 17 cannot be converted into the length of the obliquely protruding rectangular through hole 16 to push up the injection molded part 1, and the limiting filler 30 and the limiting pressing plate 32 are added at the position of the elastic push strip 17, which can prevent the U-shaped lower groove block 22 from loosening in the mounting groove 15, and provide support for the lower side of the elastic push strip 17 to prevent the elastic push strip 17 from bending downward, and the upper cover plate 33 provides support for the elastic push strip 17 from above to prevent the elastic push strip 17 from bending upward.

[0054] In order to assist the retraction process of the elastic push strip 17 and limit the movement stroke of the strip-shaped connecting plate 23, the following features are specifically provided:

[0055] A positioning shaft 35 located at the center of the mounting groove 15 is fixedly clamped between the U-shaped upper groove block 21 and the U-shaped lower groove block 22, a first spring 36 is sleeved on the positioning shaft 35, and the two ends of the first spring 36 are respectively abutted against the strip-shaped connecting plate 23 and the U-shaped lower groove block 22. The first spring 36 further assists the retraction of the elastic push strip 17, and the positioning shaft 35 is used for sleeving the first spring 36 and contacting and limiting the strip-shaped connecting plate 23.

[0056] In order to conveniently install or replace the cylindrical electromagnet 18 later, the following features are specifically provided:

[0057] The top of the transition connecting part 13 is formed with a deep groove 37 extending downward and communicating with the mounting groove 15, the side of the deep groove 37 away from the mold body part 12 is formed with a rectangular limiting insertion groove 38, the tail of the cylindrical electromagnet 18 is fixedly connected with a rectangular back plate 39, the rectangular back plate 39 is located in the lower half of the rectangular limiting insertion groove 38, and the upper half of the deep groove 37 is fixedly embedded with a closed embedded block 40 for pressing the rectangular back plate 39 in the deep groove 37.

[0058] The cylindrical electromagnet 18 is fixedly connected with the rectangular back plate 39 through bolts, and is inserted into the deep groove 37 together with the rectangular back plate 39, wherein the rectangular limiting insertion groove 38 is used for limiting the rectangular back plate 39, so that the cylindrical electromagnet 18 is fixed in place to prevent it from being pulled into the mounting groove 15 by the circular magnet 19, and the closed embedded block 40 is fastened in the slot of the deep groove 37 through bolts, so as to prevent the cylindrical electromagnet 18 from being out of groove.

[0059] In order to enable the electrode lead of the cylindrical electromagnet 18 to smoothly pass out of the deep groove 37 and be connected to the switch mechanism, the following features are specifically provided:

[0060] The rectangular back plate 39 is provided with a gap 41 for the cylindrical electromagnet 18 to pass through, and the transition connecting part 13 is provided with a through hole 42 corresponding to the gap 41. The transition connecting part 13 and the slider part 14 are both provided with a wire groove 43 for the cylindrical electromagnet 18 to pass through to the switch mechanism. The two electrode leads of the cylindrical electromagnet 18 pass through the through hole 42 in the deep groove 37, then pass through the wire groove 43 to the tail of the slider part 14 and are connected to the switch mechanism.

[0061] In order to realize the smooth electrical connection of the cylindrical electromagnet 18 after the mold is opened, so that the controller can control its on-off, the following features are specifically provided:

[0062] The switch mechanism includes a spring needle plate 44 and a contact plate 45. The outer end side wall of the slider part 14 is provided with a mounting hole 57 for mounting the spring needle plate 44, and the contact plate 45 is mounted on the limiting block 9 and corresponds to the spring needle plate 44.

[0063] When the side module 11 moves outward during the mold opening and stops until it contacts the limiting block 9, the spring needle plate 44 and the contact plate 45 complete the contact to realize the electrical connection, so that the controller can control the working state of the cylindrical electromagnet 18.

[0064] In order to ensure that the side module 11 can avoid affecting the edge quality of the injection molded part 1 due to the gap tolerance between parts, the following features are specifically provided:

[0065] The transition connecting part 13 is inclined towards the upper die seat 2 on one side close to the slider part 14, and a transverse groove 46 is formed in the side wall. A first bar magnet 47 is fixedly embedded in the transverse groove 46. One end of the wire groove 43 is located at the groove bottom of the transverse groove 46. The upper die seat 2 is provided with a second bar magnet 48 corresponding to the first bar magnet 47.

[0066] Because there is an equipment gap between the inclined pin column 7 and the inclined through hole 8, which may cause the rectangular convex module 10 and the inner mold column 6 to not fit tightly after the mold is closed. Therefore, the first bar magnet 47 is arranged on the side module 11, and the second bar magnet 48 is arranged at the corresponding position on the upper die seat 2, so that the magnetic repulsion force of the first bar magnet 47 and the second bar magnet 48 can always push the side module 11 after the mold is closed, so that the rectangular convex module 10 at the end of the side module 11 can tightly fit with the side wall of the inner mold column 6. On the other hand, the first bar magnet 47 installed in the transverse groove 46 can also tightly bury the electrode leads of the cylindrical electromagnet 18 in the wire groove 43.

[0067] In order to position the side module 11 in the mold closing and mold opening states, the following features are specifically provided:

[0068] The bottom of the slider part 14 is provided with a limiter, which comprises a seat body 49, a floating body 50 movably arranged in the seat body 49, and a second spring 51 in the floating body 50. A circular through hole 52 for upward leakage of the floating body 50 is formed in the top of the seat body 49. The second spring 51 is used to upwardly abut against the floating body 50. The top of the floating body 50 is shaped with a limiting triangular strip 53. The bottom of the slider part 14 is shaped with a first positioning hole 54 and a second positioning hole 55 corresponding to the open mold state and the closed mold state respectively. The width of the second positioning hole 55 is greater than that of the first positioning hole 54.

[0069] When the side mold block 11 is in the open mold state, the limiting triangular strip 53 on the floating body 50 is upwardly embedded in the first positioning hole 54, and the width of the first positioning hole 54 is consistent with the width of the limiting triangular strip 53, so as to ensure the stability of the current position state of the side mold block 11, and further ensure the stable contact of the spring needle small plate 44 and the contact small plate 45. When the side mold block 11 is in the closed mold state, the limiting triangular strip 53 on the floating body 50 is upwardly embedded in the second positioning hole 55. Since the width of the second positioning hole 55 is greater than the width of the limiting triangular strip 53, the side mold block 11 has a certain activity allowance at this time. In this case, due to the magnetic repulsion of the first bar magnet 47 and the second bar magnet 48, the side mold block 11 keeps close to the inner mold column 6 in the activity allowance, so as to ensure the inner edge injection quality of the rectangular opening 56 of the injection molded part 1, and effectively avoid the injection material from entering the rectangular through hole 16.

[0070] The above embodiments only express one or several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as the limitation of the patent scope of the present application. It should be noted that, for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An automatic injection molding device for automobile parts that is easy to demould, comprising an upper mold base (2) and a lower mold base (3), wherein an upper mold core (4) and a lower mold core (5) are respectively provided in the upper mold base (2) and the lower mold base (3), wherein two inner mold columns (6) for molding the inner wall of the injection molded part (1) are embedded in the lower mold core (5), and both sides of each inner mold column (6) are provided with side modules (11) for molding the two side walls of the injection molded part (1), and the side modules (11) are slidably provided in the lower mold base (3), and the upper mold base (2) is provided with a plurality of In the process of mold closing, the side module (11) is driven to be close to the inclined pin column (7) of the inner mold column (6). Each side module (11) is provided with an inclined through hole (8) for matching the inclined pin column (7). The two sides of the lower mold base (3) are also fixed with a plurality of limit blocks (9) for contact limiting the side module (11) during the mold opening process. The side of the side module (11) that is in contact with the inner mold column (6) is provided with two rectangular convex modules (10) for forming a rectangular opening (56) on the side wall of the injection molded part (1). It is characterized in that: The side module (11) is formed with a mounting groove (15), a rectangular through hole (16) connected to the mounting groove (15) is provided at the center of the rectangular convex module (10), an elastic push strip (17), a slot device for guiding the elastic push strip (17) to extend obliquely upward from the rectangular through hole (16), and a magnetic repulsion mechanism for pushing the elastic push strip (17) outward, and a switch mechanism for activating the magnetic repulsion mechanism is provided at the outer end of the side module (11); The magnetic repulsion mechanism comprises a cylindrical electromagnet (18) fixed in the side module (11) and a circular magnet (19) connected to two elastic push bars (17); when the magnetic repulsion mechanism is in operation, the circular magnet (19) is separated from the cylindrical electromagnet (18); when the magnetic repulsion mechanism is powered off, the circular magnet (19) is attracted to the cylindrical electromagnet (18); The outer end of the elastic push strip (17) is provided with a thickened portion (20) having the same thickness as the wall of the injection molded part (1); The slot device comprises a U-shaped upper slot block (21), a U-shaped lower slot block (22) and a strip connecting plate (23), both ends of the U-shaped upper slot block (21) and the U-shaped lower slot block (22) are embedded in the rectangular through hole (16), the top of the U-shaped lower slot block (22) located in the installation slot (15) is formed with two symmetrical pads (24), the bottom of the U-shaped upper slot block (21) is fixedly connected to the top of the pad (24), the height of the pad (24) is greater than the thickness of the elastic push strip (17), the U-shaped upper slot block (21) and the U-shaped lower slot are respectively The block (22) forms an accommodating gap (25) for accommodating the elastic push strip (17) on the outer sides of the two pads (24); the strip connecting plate (23) is located in the mounting groove (15) on the side close to the cylindrical electromagnet (18); both ends of the strip connecting plate (23) are provided with caulking (26) for embedding the elastic push strip (17); one end of the elastic push strip (17) is fixed to the caulking (26) by bolts; and a sinking groove (27) for embedding the circular magnet (19) is provided on the side of the strip connecting plate (23) close to the cylindrical electromagnet (18).

2. The automatic injection molding device for automobile parts with easy demoulding according to claim 1, characterized in that: The side module (11) is composed of a mold body (12), a transition connection part (13) and a slider part (14). The mold body (12) and the slider part (14) are respectively located on both sides of the transition connection part (13). The upper end of the transition connection part (13) is connected to one end of the mold body (12), and the lower end is connected to one end of the slider part (14). The slider part (14) is slidably connected to the lower mold base (3). The rectangular convex module (10) is formed on the side wall of the mold body (12) away from the slider part (14). The oblique through hole (8) is formed on the slider part (14). The mounting groove (15) is formed at the bottom of the mold body (12). The switch mechanism is located between the slider part (14) and the limit block (9).

3. The automatic injection molding device for automobile parts with easy demoulding according to claim 1, characterized in that: The front end of the U-shaped upper groove block (21) is formed with an angled portion (28) for guiding an end of the elastic push strip (17) close to the thickened portion (20) on an inclined surface, and the front end of the U-shaped lower groove block (22) is formed with an angled step portion (29) for cooperating with the angled portion (28) to jointly accommodate the thickened portion (20).

4. The automatic injection molding device for automobile parts with easy demoulding according to claim 3, characterized in that: A limiting filling block (30) is further provided in the installation groove (15), one end of the limiting filling block (30) is pressed against a side wall of the installation groove (15), and the other end is pressed against the same end of the U-shaped upper groove block (21) and the U-shaped lower groove block (22). A bracket (31) for supporting the sliding translation of the strip connecting plate (23) is formed on the top of one end of the limiting filling block (30), and a pair of limiting pressure plates (32) are formed on both ends of the side of the strip connecting plate (23) away from the cylindrical electromagnet (18). Each pair of limiting pressure plates (32) 2) are respectively located above and below the caulking (26), the spacing between each pair of limiting pressure plates (32) is consistent with the spacing of the caulking (26), the width of the limiting pressure plates (32) is less than half the width of the elastic push strip (17), the tops of both sides of the limiting filling block (30) are fixedly connected with cover plates (33) for pressing the elastic push strip (17) downward, and the top of the limiting filling block (30) and the bottom of the cover plate (33) are both formed with accommodating grooves (34) for accommodating the translational movement of the limiting pressure plates (32).

5. The automatic injection molding device for automobile parts with easy demoulding according to claim 1, characterized in that: A positioning shaft (35) located at the center of the mounting groove (15) is fixedly clamped between the U-shaped upper groove block (21) and the U-shaped lower groove block (22). A first spring (36) is sleeved on the positioning shaft (35). Two ends of the first spring (36) respectively press against the strip connecting plate (23) and the U-shaped lower groove block (22).

6. The automatic injection molding device for automobile parts with easy demoulding according to claim 2, characterized in that: The top of the transition connection part (13) is formed with a deep groove (37) extending downward and connected to the installation groove (15), and a rectangular limiting slot (38) is formed on the side of the deep groove (37) away from the mold body part (12). The tail of the cylindrical electromagnet (18) is fixedly connected with a rectangular back plate (39), and the rectangular back plate (39) is located in the lower half of the rectangular limiting slot (38). The upper half of the deep groove (37) is fixedly embedded with a closed insert (40) for pressing the rectangular back plate (39) into the deep groove (37).

7. The automatic injection molding device for automobile parts with easy demoulding according to claim 6, characterized in that: The rectangular back plate (39) is provided with an escape notch (41) for routing the cylindrical electromagnet (18); the transition connection portion (13) is formed with a wire through hole (42) corresponding to the escape notch (41); and the transition connection portion (13) and the slider portion (14) are both provided with a wire groove (43) for routing the cylindrical electromagnet (18) to the switch mechanism.

8. The automatic injection molding device for automobile parts with easy demoulding according to claim 2, characterized in that: The switch mechanism comprises a spring ejector plate (44) and a contact plate (45); a mounting hole (57) for mounting the spring ejector plate (44) is provided on the outer side wall of the slider portion (14); the contact plate (45) is mounted on the limiting block (9) and is arranged corresponding to the spring ejector plate (44).

9. The automatic injection molding device for automobile parts with easy demoulding according to claim 7, characterized in that: The side of the transition connecting portion (13) close to the slider portion (14) is inclined toward the upper die base (2), and a transverse through groove (46) is provided on the side wall. A first bar magnet (47) is fixedly embedded in the transverse through groove (46). One end of the line groove (43) is located at the bottom of the transverse through groove (46). A second bar magnet (48) corresponding to the first bar magnet (47) is provided in the upper die base (2).

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