Plastic product negative pressure injection molding mold and method

Abstract

The present invention provides a negative pressure injection molding mold for plastic products and a method thereof, and relates to the technical field of plastic injection molding. The negative pressure injection molding mold for plastic products and a method thereof comprise a combined mold mechanism, a linkage ejection mechanism and a linkage repair mechanism. The lower linkage end of the combined mold mechanism is provided with a linkage ejection mechanism, and the upper linkage end of the combined mold mechanism is provided with a linkage repair mechanism. With the assistance of the externally threaded column rotated by the internal thread column and the ejection pool that is restricted from rotating by the lower mold table, the ejection pool is displaced toward the opening direction of the lower mold table, the molded blank of the plastic shell is pushed up, and gradually separated from the lower mold table, so that the fixed arm can form a vertical state at the same time as the secondary linkage shell completes the mold opening, and contacts the molded blank that gradually separates from the lower mold table, and cuts off the protruding part formed by the lower mold table and the injection end tube, thereby forming a mold opening and repairing operation at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic injection molding, in particular to a negative pressure injection molding mold for plastic products and a method thereof. Background Art

[0002] Injection molding of plastic products is a processing method used in the mass production of certain complex-shaped components. Specifically, it refers to the process of injecting heated and molten material into the mold cavity under high pressure, and then cooling and solidifying it to obtain a molded product. Recently, with the development of the plastics industry, the application range of plastic products has continued to expand, and the proportion of plastic products has also increased rapidly. A plastic mold is a combined plastic mold used for extrusion, injection, compression molding, blow molding and low-foaming molding. It mainly includes a movable mold and a fixed mold. Usually, the movable mold is provided with a core, and the fixed mold is provided with a cavity.

[0003] After injection molding is completed, the waste material at the gate of the plastic product is difficult to separate from the plastic product, and it is very easy to leave sealing marks at the gate, affecting the quality and appearance of the product. On the other hand, when the injection mold is molding some accessories with deeper molding positions, the accessories will stick to the mold during demolding, causing the accessories to break and unable to be demolded smoothly. At the same time, there will be protruding parts that cannot be removed between the injection mold and the injection port, which cannot be quickly removed at the same time as the mold is opened, thus causing defects. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the present invention provides a negative pressure injection molding mold for plastic products and a method thereof, which solves the problem that the demoulding and blank repair cannot be carried out simultaneously when the plastic injection mold is opened.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a negative pressure injection molding mold for plastic products, comprising a combined mold mechanism, a linkage ejection mechanism, and a linkage repair mechanism, wherein the lower linkage end of the combined mold mechanism is provided with a linkage ejection mechanism, and the upper linkage end of the combined mold mechanism is provided with a linkage repair mechanism;

[0006] The linkage ejection mechanism includes an ejection pool, an internal threaded column, a linkage rod, an external threaded column, a worm gear 1, a linkage roller, a worm gear 2, a linkage main shaft, a linkage worm gear 1, a transmission worm gear and a stable frame, the ejection pool is slidably connected to the inside of the lower mold table, the bottom wall of the ejection pool is fixedly connected with the internal threaded column, the linkage rod is rotatably connected to the bottom wall of the lower mold table, the top of the linkage rod is fixedly connected with the external threaded column, the external threaded column is threadedly connected to the inside of the internal threaded column, the bottom end of the linkage rod is fixedly connected to the worm gear 1, between the bottom rotating shafts, the side wall of the linkage roller is fixedly connected with the worm gear 2, the linkage main shaft is rotatably connected to the inside of the main linkage housing, the linkage main shaft is fixedly connected to the linkage worm gear 1 at one end in the opposite direction of the input wall of the main linkage housing, the linkage worm gear 1 is meshed with the worm gear 2, the side wall of the linkage main shaft is fixedly connected with the transmission worm gear, and the transmission worm gear is meshed with the worm gear 1.

[0007] Preferably, the combined mold mechanism includes a main linkage shell, an expansion linkage rod, a secondary linkage shell, an upper mold table, a sealing strip, a mold cavity, a lower mold table, a sealing groove, a hydraulic drive assembly, a fixed swivel seat, a film injection end tube and a vacuum pump. The side walls adjacent to the input wall of the main linkage shell are rotatably connected to the expansion linkage rod, and the other ends of the expansion linkage rods are rotatably connected to the secondary linkage shell. The lower mold table is fixedly connected to the inside of the main linkage shell, and an ejection pool is provided in the inner cavity of the lower mold table. The side walls adjacent to the input wall of the main linkage shell are rotatably connected to the hydraulic drive assembly, and the other ends of the hydraulic drive assembly are rotatably connected to the side walls of the secondary linkage shell. The expansion linkage rod is fixedly connected to the fixed swivel seat.

[0008] Preferably, the linkage batch repair mechanism includes a main linkage arm, a linkage slide, a secondary linkage arm, a sliding swivel, a fixed arm, a cutting disc and an auxiliary linkage arm. The one side end of the main linkage arm in the opposite direction of the input wall of the main linkage shell is rotatably connected to the upper rotating shaft of the unfolding linkage rod, the bottom of the main linkage arm is fixedly connected to the linkage slide, the one side end of the secondary linkage arm in the opposite direction of the input wall of the main linkage shell is rotatably connected to the fixed swivel, the other side end of the main linkage arm is rotatably connected to the fixed arm, the cutting disc is fixedly connected between the fixed arms, the side wall of the fixed arm is rotatably connected to the auxiliary linkage arm, and the other end of the auxiliary linkage arm is rotatably connected to the secondary linkage arm.

[0009] Preferably, the interior of the secondary linkage housing is fixedly connected to the upper mold platform, and the side wall of the cavity of the upper mold platform is fixedly connected to a sealing strip.

[0010] Preferably, a mold cavity is provided inside the upper mold platform, and a sealing groove is provided on the side wall of the cavity of the lower mold platform.

[0011] Preferably, the input wall of the main linkage housing is fixedly connected with a film injection end tube, and the output end of the film injection end tube extends to the interior of the lower mold table.

[0012] Preferably, the stabilizing frame is fixedly connected to the ejection pool, the transmission worm wheel is arranged inside the stabilizing frame, and a bottom end of the worm is rotatably connected to the side wall of the stabilizing frame.

[0013] Preferably, the other side end of the secondary linkage arm is rotatably connected to a sliding swivel seat, and the sliding swivel seat is slidably connected inside the linkage slide.

[0014] Preferably, the negative pressure injection molding method for plastic products comprises the following steps:

[0015] S1. First, the hydraulic drive assembly is turned on to generate a pulling force, which pulls the secondary linkage shell connected to the output end of the hydraulic drive assembly to one side. The secondary linkage shell is restricted by the secondary linkage shell that is rotatably installed between the secondary linkage shell and the main linkage shell, and performs arc rotation displacement. The end of the hydraulic drive assembly connected to the main linkage shell also drives the hydraulic drive assembly to rotate, so that the secondary linkage shell can cover the top of the main linkage shell, and at the same time, the upper mold table inside the secondary linkage shell and the lower mold table inside the main linkage shell are covered with each other. At the same time, the sealing groove of the lower mold table and the sealing strip installed on the upper mold table are matched with each other, and the mold cavities inside the upper and lower mold tables form a sealed space. The external injection molding machine is connected to the film injection end tube, and the molten raw material of the plastic shell is added into the mold cavity, and the molten raw material is waited for to be formed.

[0016] S2. After the molten raw material is formed, the hydraulic drive assembly is turned on to enable the secondary linkage shell to be re-displaced along the arc trajectory and detached from the main linkage shell, so that the molded blank inside the mold cavity is exposed to the outside. When the arc displacement of the secondary linkage shell is turned on, the hydraulic drive assembly starts to rotate along the rotating end installed by the main linkage shell, and the rotating shaft of its rotating end drives the linkage roller to rotate accordingly, and the linkage roller also drives the worm gear 2 to rotate accordingly. At the same time, the linkage worm gear 1 engaged with the worm gear 2 also drives the linkage main shaft to rotate inside the main linkage shell, and another set of transmission worm gears installed on the linkage main shaft rotates with the linkage main shaft while driving the worm gear 1 engaged with it and the linkage rod fixed to the worm gear 1 to rotate. The external threaded column of the linkage rod rotates accordingly and also rotates inside the internal threaded column located inside the lower mold table. The internal threaded column, with the assistance of the rotating external threaded column and the ejector pool that is restricted from rotating by the lower mold table, displaces the ejector pool toward the opening direction of the lower mold table, pushes up the molded blank of the plastic shell, and gradually separates from the lower mold table;

[0017] S3. When the arc of the secondary linkage shell separates from the main linkage shell, the unfolding linkage rod rotates in the opposite direction, and the fixed swivel seat installed on it drives the secondary linkage arm to rotate. The displacement of the secondary linkage shell causes the main linkage arm installed on the secondary linkage shell to rotate. The main linkage arm itself also rotates and displaces at the same time. The secondary linkage arm and the sliding swivel seat installed at one end of it are restricted in the sliding of the linkage slide installed at the bottom of the main linkage arm, so that the main linkage arm rotates in the opposite direction of the displacement of the secondary linkage shell, pushing the fixed arm in the injection direction of the molded blank. While the fixed arm is displacing, the auxiliary linkage arm installed between it and the secondary linkage arm rotates so that the fixed arm has a directional dragging force, so that the fixed arm can form a vertical state when the secondary linkage shell completes the mold opening, and contact the molded blank that gradually separates from the lower mold table, and cuts off the protruding part formed by the lower mold table and the injection end tube, thereby forming a batch repairing operation at the same time as the mold opening.

[0018] Preferably, in step S1, after the mold cavities inside the upper mold table and the lower mold table form a sealed space, a vacuum pump is turned on to evacuate the interior of the mold cavity into a vacuum space.

[0019] The present invention provides a negative pressure injection molding mold for plastic products and a method thereof. It has the following beneficial effects:

[0020] 1. The present invention turns on the hydraulic drive assembly so that the secondary linkage shell can be re-displaced along the arc trajectory and separated from the main linkage shell, so that the molded blank inside the mold cavity is exposed to the outside. When the arc displacement of the secondary linkage shell is turned on, the hydraulic drive assembly starts to rotate along the rotating end installed by the main linkage shell, and the rotating shaft of its rotating end drives the linkage roller to rotate accordingly, and the linkage roller also drives the worm gear 2 to rotate. At the same time, the linkage worm gear 1 engaged with the worm gear 2 also drives the linkage main shaft to rotate inside the main linkage shell, and another set of transmission worm gears installed on the linkage main shaft rotates with the linkage main shaft while driving the worm gear 1 engaged with it and the linkage rod fixed to the worm gear 1 to rotate. The external threaded column of the linkage rod rotates accordingly and also rotates inside the internal threaded column located inside the lower mold table. The internal threaded column, with the assistance of the rotating external threaded column and the ejection pool that is restricted from rotating by the lower mold table, displaces the ejection pool toward the opening direction of the lower mold table, pushes up the molded blank of the plastic shell, and gradually separates from the lower mold table.

[0021] 2. The present invention separates the secondary linkage shell from the main linkage shell through the arc of the secondary linkage shell, and the unfolded linkage rod rotates in the opposite direction accordingly, and the fixed swivel seat installed on itself drives the secondary linkage arm to rotate, and the displacement of the secondary linkage shell causes the main linkage arm installed on the secondary linkage shell to rotate. The main linkage arm itself also rotates and displaces at the same time, and the secondary linkage arm and the sliding swivel seat installed at one end of it are restricted by the sliding inside the linkage slide installed at the bottom of the main linkage arm, so that the main linkage arm rotates in the opposite direction of the displacement of the secondary linkage shell, pushing the fixed arm in the injection direction of the molded blank, and while the fixed arm is displacing, the auxiliary linkage arm installed between it and the secondary linkage arm rotates so that the fixed arm has a directional dragging force, so that the fixed arm can form a vertical state at the same time as the secondary linkage shell completes the mold opening, and contacts the molded blank gradually separated from the lower mold table, and cuts off the protruding part formed by the lower mold table and the injection end tube, thereby forming a mold opening and batch repairing operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is an isometric schematic diagram of the present invention;

[0023] Figure 2 It is a schematic diagram of the upper and lower isometric angles of the present invention;

[0024] Figure 3 It is a schematic diagram of the front and rear isometric views of the present invention;

[0025] Figure 4 This is a schematic diagram of an axonometric view of the present invention at a depression angle of 120 degrees;

[0026] Figure 5 This is a schematic diagram of an axonometric view of the present invention at an elevation angle of 120 degrees;

[0027] Figure 6 This is a schematic diagram of the assembly structure of the ejection pool of the present invention;

[0028] Figure 7 It is a rear perspective schematic diagram of the present invention;

[0029] Figure 8 For the present invention Figure 5 Enlarged schematic diagram of point A in the middle.

[0030] Among them, 1. Combined mold mechanism; 2. Linkage ejection mechanism; 3. Linkage repair mechanism; 101. Main linkage shell; 102. Expanding linkage rod; 103. Secondary linkage shell; 104. Upper mold table; 105. Sealing strip; 106. Mold cavity; 107. Lower mold table; 108. Sealing groove; 109. Hydraulic drive assembly; 110. Fixed swivel seat; 111. Film injection end pipe; 112. Vacuum pump; 201. Ejector tank; 20 2. Internal threaded column; 203. Linking rod; 204. External threaded column; 205. Worm 1; 206. Linking roller; 207. Worm 2; 208. Linking spindle; 209. Linking worm gear 1; 210. Transmission worm gear; 211. Stabilizing frame; 301. Main linkage arm; 302. Linking slide; 303. Secondary linkage arm; 304. Sliding swivel; 305. Fixed arm; 306. Cutting disc; 307. Auxiliary linkage arm. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] Example:

[0033] like Figure 1-8 As shown, an embodiment of the present invention provides a negative pressure injection molding mold for plastic products, comprising a combined mold mechanism 1, a linkage ejection mechanism 2, and a linkage repair mechanism 3. The lower linkage end of the combined mold mechanism 1 is provided with the linkage ejection mechanism 2, and the upper linkage end of the combined mold mechanism 1 is provided with the linkage repair mechanism 3;

[0034] The linkage ejection mechanism 2 includes an ejection pool 201, an internal threaded column 202, a linkage rod 203, an external threaded column 204, a worm 1 205, a linkage roller 206, a worm 207, a linkage main shaft 208, a linkage worm gear 1 209, a transmission worm gear 210 and a stable frame 211. The ejection pool 201 is slidably connected to the interior of the lower mold table 107, the bottom wall of the ejection pool 201 is fixedly connected to the internal threaded column 202, the linkage rod 203 is rotatably connected to the bottom wall of the lower mold table 107, the top of the linkage rod 203 is fixedly connected to the external threaded column 204, the external threaded column 204 is threadedly connected to the interior of the internal threaded column 202, and the bottom end of the linkage rod 203 is fixedly connected to the worm 1 205, 206 are fixedly connected between the bottom rotating shafts of the hydraulic drive assembly 109, the side wall of the linkage roller 206 is fixedly connected to the worm 207, the linkage main shaft 208 is rotatably connected to the inside of the main linkage housing 101, the end of the linkage main shaft 208 in the opposite direction of the input wall of the main linkage housing 101 is fixedly connected to the linkage worm gear 1 209, the linkage worm gear 1 209 is meshed with the worm 207, the side wall of the linkage main shaft 208 is fixedly connected to the transmission worm gear 210, the transmission worm gear 210 is meshed with the worm 1 205, the stable frame 211 is fixedly connected to the ejection pool 201, the transmission worm gear 210 is arranged inside the stable frame 211, and the bottom end of the worm 1 205 The rotation is connected to the side wall of the stable frame 211. After the molten raw material is formed, the hydraulic drive component 109 is turned on to enable the secondary linkage shell 103 to be re-displaced along the arc trajectory and separated from the main linkage shell 101, so that the molded blank inside the mold cavity 106 is exposed to the outside. When the secondary linkage shell 103 is turned on, the hydraulic drive component 109 starts to rotate along the rotating end installed on the main linkage shell 101, and the rotating shaft of the rotating end drives the linkage roller 206 to rotate accordingly, and the linkage roller 206 also drives the worm 207 to rotate. At the same time, the linkage worm wheel 1 209 engaged with the worm 207 also drives the linkage main shaft 208 to rotate in the main linkage shell 10 1 rotates internally, and another set of transmission worm gears 210 attached to the linkage main shaft 208 rotates in conjunction with the main shaft 208, driving the worm 1 205 meshing with it and the linkage rod 203 fixed with the worm 1 205 to rotate. The externally threaded column 204 of the linkage rod 203 rotates accordingly and also rotates inside the internally threaded column 202 located inside the lower mold table 107. With the assistance of the rotating externally threaded column 204 and the ejector pool 201 that is restricted from rotating by the lower mold table 107, the internally threaded column 202 moves the ejector pool 201 toward the opening direction of the lower mold table 107, thereby pushing up the molded blank of the plastic shell and gradually separating it from the lower mold table 107.

[0035] The combined mold mechanism 1 includes a main linkage shell 101, an expansion linkage rod 102, a sub-linkage shell 103, an upper mold table 104, a sealing strip 105, a mold cavity 106, a lower mold table 107, a sealing groove 108, a hydraulic drive assembly 109, a fixed swivel seat 110, a film injection end tube 111 and a vacuum pump 112. The side walls adjacent to the input wall of the main linkage shell 101 are rotatably connected to the expansion linkage rod 102, and the other end of the expansion linkage rod 102 is rotatably connected to the sub-linkage shell 103. The interior of the main linkage shell 101 is fixedly connected to the lower mold table 107, and the inner cavity of the lower mold table 107 is provided with an ejection pool 201. The side walls adjacent to the input wall of the dynamic housing 101 are rotatably connected to the hydraulic drive assembly 109, and the other ends of the hydraulic drive assembly 109 are rotatably connected to the side wall of the secondary linkage housing 103. The interior of the expansion linkage rod 102 is fixedly connected to a fixed swivel seat 110, and the interior of the secondary linkage housing 103 is fixedly connected to the upper mold table 104. The side wall of the cavity of the upper mold table 104 is fixedly connected to a sealing strip 105. A mold cavity 106 is provided inside the upper mold table 104, and a sealing groove 108 is provided on the side wall of the cavity of the lower mold table 107. The input wall of the main linkage housing 101 is fixedly connected to the injection molding end tube 111, and the input of the injection molding end tube 111 is fixedly connected to the injection molding end tube 111. The output end extends to the inside of the lower mold table 107, and by turning on the hydraulic drive component 109, the hydraulic drive component 109 generates a pulling force, which rotates the auxiliary linkage shell 103 connected to the output end of the hydraulic drive component 109 to pull it to one side, and the auxiliary linkage shell 103 is restricted by the auxiliary linkage shell 103 installed between the main linkage shell 101, and performs arc rotation displacement, and the end of the hydraulic drive component 109 connected to the main linkage shell 101 also drives the hydraulic drive component 109 to rotate, so that the auxiliary linkage shell 103 can cover the top of the main linkage shell 101, and at the same time, the upper mold table 101 inside the auxiliary linkage shell 103 is 04 and the lower mold table 107 inside the main linkage shell 101 cover each other, and at the same time, the sealing groove 108 opened in the lower mold table 107 fits with the sealing strip 105 installed on the upper mold table 104, and the upper mold table 104 and the mold cavity 106 inside the lower mold table 107 form a sealed space. The external injection molding machine and the film injection end tube 111 are connected to each other. After the mold cavity 106 inside the upper mold table 104 and the lower mold table 107 form a sealed space, turn on the vacuum pump 112 to evacuate the inside of the mold cavity 106 into a vacuum space, add the molten raw material of the plastic shell into the mold cavity 106, and wait for the molten raw material to be formed.

[0036] The linkage repair mechanism 3 includes a main linkage arm 301, a linkage slide 302, a secondary linkage arm 303, a sliding swivel 304, a fixed arm 305, a cutting knife disc 306 and an auxiliary linkage arm 307. The main linkage arm 301 is rotatably connected to the upper rotating shaft of the unfolding linkage rod 102 at one end in the opposite direction of the input wall of the main linkage shell 101. The bottom of the main linkage arm 301 is fixedly connected to the linkage slide 302, and the secondary linkage arm 303 is rotatably connected to the one end in the opposite direction of the input wall of the main linkage shell 101. The fixed swivel seat 110, the other side end of the main linkage arm 301 is rotatably connected to the fixed arm 305, and the cutting knife disc 306 is fixedly connected between the fixed arms 305. The side wall of the fixed arm 305 is rotatably connected to the auxiliary linkage arm 307, and the other end of the auxiliary linkage arm 307 is rotatably connected to the secondary linkage arm 303. The other side end of the secondary linkage arm 303 is rotatably connected to the sliding swivel seat 304, and the sliding swivel seat 304 is slidably connected to the inside of the linkage slide 302. At the same time, the secondary linkage shell 103 arcs away from the main linkage shell 101 When the linkage rod 102 is unfolded, it rotates in the opposite direction, and the fixed swivel seat 110 installed on it drives the secondary linkage arm 303 to rotate, and the displacement of the secondary linkage shell 103 causes the main linkage arm 301 to rotate. The main linkage arm 301 itself also rotates and displaces at the same time, and the secondary linkage arm 303 and the sliding swivel seat 304 installed on one end of the main linkage arm 301 slide within the linkage slide 302 installed at the bottom of the main linkage arm 301, so that the main linkage arm 301 rotates in the opposite direction of the displacement of the secondary linkage shell 103. , pushing the fixed arm 305 in the direction of injecting the molded blank, and while the fixed arm 305 is displacing, the auxiliary linkage arm 307 installed between the fixed arm 305 and the secondary linkage arm 303 rotates to provide a directional dragging force on the fixed arm 305, so that the fixed arm 305 can form a vertical state at the same time as the secondary linkage shell 103 completes the mold opening, and contact the molded blank that is gradually separated from the lower mold table 107, and cut off the protruding part formed by the lower mold table 107 and the injection end tube 111, thereby forming a batch repairing operation at the same time as the mold opening.

[0037] An embodiment of the present invention provides a negative pressure injection molding method for a plastic product, comprising the following steps:

[0038] S1. First, the hydraulic drive assembly 109 is turned on to generate a pulling force, and the auxiliary linkage shell 103 connected to the output end of the hydraulic drive assembly 109 is rotated to one side, and the auxiliary linkage shell 103 is restricted by the auxiliary linkage shell 103 installed between the main linkage shell 101, and performs arc rotation displacement. The end of the hydraulic drive assembly 109 connected to the main linkage shell 101 also drives the hydraulic drive assembly 109 to rotate, so that the auxiliary linkage shell 103 can cover the top of the main linkage shell 101, and at the same time, the upper mold table 104 inside the auxiliary linkage shell 103 is aligned with the main linkage shell 101. The lower mold table 107 inside the dynamic shell 101 covers each other, and the sealing groove 108 opened in the lower mold table 107 fits with the sealing strip 105 installed on the upper mold table 104. The upper mold table 104 and the mold cavity 106 inside the lower mold table 107 form a sealed space. The external injection molding machine and the film injection end tube 111 are connected to each other. After the mold cavity 106 inside the upper mold table 104 and the lower mold table 107 form a sealed space, the vacuum pump 112 is turned on to evacuate the mold cavity 106 into a vacuum space, and the molten raw material of the plastic shell is added into the mold cavity 106, and the molten raw material is allowed to form.

[0039] S2. After the molten raw material is formed, the hydraulic drive component 109 is turned on to enable the secondary linkage shell 103 to be re-displaced along the arc trajectory and separated from the main linkage shell 101, so that the molded blank inside the mold cavity 106 is exposed to the outside. When the secondary linkage shell 103 is turned on, the hydraulic drive component 109 starts to rotate along the rotating end installed on the main linkage shell 101, and the rotating shaft of its rotating end drives the linkage roller 206 to rotate accordingly, and the linkage roller 206 also drives the worm 207 to rotate. At the same time, the linkage worm wheel 1 209 engaged with the worm 207 also drives the linkage main shaft 208 to rotate inside the main linkage shell 101. , and another set of transmission worm gears 210 installed on the linkage main shaft 208 rotates along with the linkage main shaft 208, while driving the worm 1 205 meshing with it and the linkage rod 203 fixed with the worm 1 205 to rotate. The external threaded column 204 rotating along with the linkage rod 203 also rotates inside the internal threaded column 202 located inside the lower mold table 107. The internal threaded column 202, with the assistance of the rotating external threaded column 204 and the ejector pool 201 that is restricted from rotating by the lower mold table 107, displaces the ejector pool 201 toward the opening direction of the lower mold table 107, thereby pushing up the molded blank of the plastic shell and gradually separating it from the lower mold table 107.

[0040] S3, when the secondary linkage shell 103 arcs away from the main linkage shell 101, the unfolded linkage rod 102 rotates in the opposite direction, and the fixed swivel seat 110 installed on it drives the secondary linkage arm 303 to rotate, and the displacement of the secondary linkage shell 103 causes the main linkage arm 301 to rotate. The main linkage arm 301 installed on the secondary linkage shell 103 also rotates and displaces at the same time, and the secondary linkage arm 303 and the sliding swivel seat 304 installed on one end of the secondary linkage arm 303 are restricted by the internal sliding of the linkage slide 302 installed at the bottom of the main linkage arm 301, so that the main linkage arm 301 moves toward the secondary linkage The shell 103 is displaced and rotated in the opposite direction, pushing the fixed arm 305 in the injection direction of the molded blank. While the fixed arm 305 is displaced, the auxiliary linkage arm 307 installed between the auxiliary linkage arm 303 rotates to provide a directional dragging force on the fixed arm 305, so that the fixed arm 305 can form a vertical state at the same time as the auxiliary linkage shell 103 completes the mold opening, and contact the molded blank that is gradually separated from the lower mold table 107, and cut off the protruding part formed by the lower mold table 107 and the injection end tube 111, thereby completing the mold opening and batch repairing operation.

[0041] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A negative pressure injection molding mold for plastic products, comprising a combined mold mechanism (1), a linkage ejection mechanism (2) and a linkage repair mechanism (3), characterized in that: The lower linkage end of the combined mold mechanism (1) is provided with a linkage ejection mechanism (2), and the upper linkage end of the combined mold mechanism (1) is provided with a linkage repair mechanism (3); The combined mold mechanism (1) comprises a main linkage shell (101), an expansion linkage rod (102), a secondary linkage shell (103), an upper mold platform (104), a sealing strip (105), a mold cavity (106), a lower mold platform (107), a sealing groove (108), a hydraulic drive assembly (109), a fixed swivel seat (110), a film injection end tube (111) and a vacuum pump (112). The side walls adjacent to the input wall of the main linkage shell (101) are rotatably connected to the expansion linkage rod (102). The expansion linkage rod ( 102) and the other end thereof are rotatably connected to the secondary linkage housing (103); a lower mold platform (107) is fixedly connected inside the main linkage housing (101); an ejection pool (201) is provided in the inner cavity of the lower mold platform (107); the side walls adjacent to the input wall of the main linkage housing (101) are rotatably connected to hydraulic drive components (109); the other ends of the hydraulic drive components (109) are rotatably connected to the side walls of the secondary linkage housing (103); and a fixed swivel seat (110) is fixedly connected inside the deployment linkage rod (102); The linkage ejection mechanism (2) comprises an ejection pool (201), an internal thread column (202), a linkage rod (203), an external thread column (204), a worm (205), a linkage roller (206), a worm (207), a linkage main shaft (208), a linkage worm wheel (209), a transmission worm wheel (210) and a stabilizing frame (211); the ejection pool (201) is slidably connected to the interior of the lower mold platform (107); the bottom wall of the ejection pool (201) is fixedly connected to the internal thread column (202); the linkage rod (203) is rotatably connected to the bottom wall of the lower mold platform (107); the top end of the linkage rod (203) is fixedly connected to the external thread column (204); the external thread column (204) is threadedly connected to the internal thread column (202), the bottom end of the linkage rod (203) is fixedly connected to a worm (205), the linkage roller (206) is fixedly connected between the bottom rotating shafts of the hydraulic drive assembly (109), the side wall of the linkage roller (206) is fixedly connected to a worm (207), the linkage main shaft (208) is rotatably connected to the inside of the main linkage housing (101), the linkage main shaft (208) is fixedly connected to a linkage worm gear (209) at one end opposite to the input wall of the main linkage housing (101), the linkage worm gear (209) is meshed with the worm (207), the side wall of the linkage main shaft (208) is fixedly connected to a transmission worm gear (210), the transmission worm gear (210) is meshed with the worm (205); The linkage batch repair mechanism (3) includes a main linkage arm (301), a linkage slide (302), a secondary linkage arm (303), a sliding swivel seat (304), a fixed arm (305), a cutting knife disc (306) and an auxiliary linkage arm (307). The main linkage arm (301) is rotatably connected to the upper rotation axis of the unfolding linkage rod (102) at one end in the opposite direction to the input wall of the main linkage shell (101). The bottom of the main linkage arm (301) is fixedly connected to the linkage slide (302). The secondary linkage arm (303) is rotatably connected to the input wall of the main linkage shell (101). One side end of the main linkage arm (301) is rotatably connected to a fixed swivel seat (110), the other side end of the main linkage arm (301) is rotatably connected to a fixed arm (305), a cutting knife disc (306) is fixedly connected between the fixed arms (305), a side wall of the fixed arm (305) is rotatably connected to an auxiliary linkage arm (307), the other end of the auxiliary linkage arm (307) is rotatably connected to a secondary linkage arm (303), the other side end of the secondary linkage arm (303) is rotatably connected to a sliding swivel seat (304), and the sliding swivel seat (304) is slidably connected to the inside of the linkage slide (302).

2. The negative pressure injection molding die for plastic products according to claim 1, characterized in that: The interior of the secondary linkage housing (103) is fixedly connected to the upper mold platform (104), and the side wall of the cavity of the upper mold platform (104) is fixedly connected to a sealing strip (105).

3. The negative pressure injection molding die for plastic products according to claim 1, characterized in that: A mold cavity (106) is provided inside the upper mold platform (104), and a sealing groove (108) is provided on the side wall of the cavity of the lower mold platform (107).

4. The negative pressure injection molding die for plastic products according to claim 1, characterized in that: The input wall of the main linkage housing (101) is fixedly connected to a film injection end tube (111), and the output end of the film injection end tube (111) extends to the interior of the lower mold platform (107).

5. The negative pressure injection molding die for plastic products according to claim 1, characterized in that: The stabilizing frame (211) is fixedly connected to the ejection pool (201), the transmission worm wheel (210) is arranged inside the stabilizing frame (211), and the bottom end of the worm (205) is rotatably connected to the side wall of the stabilizing frame (211).

6. A method for forming a negative pressure injection mold for a plastic product, the negative pressure injection mold for a plastic product according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. First, the hydraulic drive assembly (109) is turned on to generate a pulling force, and the auxiliary linkage shell (103) connected to the output end of the hydraulic drive assembly (109) is pulled to one side. The auxiliary linkage shell (103) is restricted by the auxiliary linkage shell (103) installed between the main linkage shell (101) and performs arc rotation displacement. The end of the hydraulic drive assembly (109) connected to the main linkage shell (101) also drives the hydraulic drive assembly (109) to rotate, so that the auxiliary linkage shell (103) can cover the main linkage shell (101). ) top, and simultaneously make the upper mold platform (104) inside the secondary linkage shell (103) and the lower mold platform (107) inside the main linkage shell (101) cover each other, and at the same time, the sealing groove (108) opened in the lower mold platform (107) and the sealing strip (105) installed on the upper mold platform (104) fit together, and the mold cavity (106) inside the upper mold platform (104) and the lower mold platform (107) form a sealed space, and use the external injection molding machine and the injection end tube (111) to connect with each other, and add the molten raw material of the plastic shell into the mold cavity (106), and wait for the molten raw material to be formed; S2. After the molten raw material is formed, the hydraulic drive assembly (109) is turned on to enable the secondary linkage shell (103) to be re-displaced along the arc trajectory and separated from the main linkage shell (101), so that the molded blank inside the mold cavity (106) is exposed to the outside. When the secondary linkage shell (103) is turned on, the hydraulic drive assembly (109) starts to rotate along the rotating end installed on the main linkage shell (101), and the rotating shaft of the rotating end drives the linkage roller (206) to rotate, and the linkage roller (206) also drives the worm gear 2 (207) to rotate. At the same time, the linkage worm gear 1 (209) meshing with the worm gear 2 (207) also drives the linkage main shaft (208) to rotate inside the main linkage shell (101), and the linkage Another set of transmission worm gears (210) installed on the moving main shaft (208) rotates along with the main shaft (208), and at the same time drives the worm (205) meshing with it and the linkage rod (203) fixed to the worm (205) to rotate. The external threaded column (204) rotated by the linkage rod (203) also rotates inside the internal threaded column (202) located inside the lower mold platform (107). The internal threaded column (202) is assisted by the rotating external threaded column (204) and the ejection pool (201) that is restricted from rotating by the lower mold platform (107), so as to displace the ejection pool (201) toward the opening direction of the lower mold platform (107), thereby pushing up the molded blank of the plastic shell and gradually separating from the lower mold platform (107). S3, when the secondary linkage shell (103) arcs away from the main linkage shell (101), the linkage rod (102) rotates in the opposite direction, and the fixed rotating seat (110) installed on it drives the secondary linkage arm (303) to rotate, and the displacement of the secondary linkage shell (103) causes the main linkage arm (301) to rotate. The main linkage arm (301) installed on the secondary linkage shell (103) also rotates and displaces at the same time, and the secondary linkage arm (303) and the sliding rotating seat (304) installed on one end thereof slide within the linkage slide (302) installed at the bottom of the main linkage arm (301) to limit the main linkage arm (301) to move. The auxiliary linkage shell (103) is displaced and rotated in the opposite direction, pushing the fixed arm (305) in the direction of injection of the molded blank. While the fixed arm (305) is displaced, the auxiliary linkage arm (307) installed between the auxiliary linkage arm (303) rotates to provide a dragging force in one direction on the fixed arm (305), so that the fixed arm (305) can form a vertical state when the auxiliary linkage shell (103) completes the mold opening, and contact the molded blank that gradually separates from the lower mold table (107), and cut off the protruding part formed by the lower mold table (107) and the injection end tube (111), thereby forming a batch repairing operation at the same time as the mold opening.

7. The negative pressure injection molding method for plastic products according to claim 6, characterized in that: In the step S1, after the mold cavity (106) inside the upper mold platform (104) and the lower mold platform (107) forms a sealed space, the vacuum pump (112) is turned on to evacuate the inside of the mold cavity (106) into a vacuum space.

Images