A kind of injection molding machine and control method thereof

Abstract

The present application discloses a reverse injection molding machine: comprising a frame, a clamping device and an injection device; the injection device comprises a first injection unit and a second injection unit, the injection device and the clamping device are mounted on the frame, the clamping device is arranged between the first injection unit and the second injection unit, the clamping device comprises a first template, a second template and a third template, a first mold is mounted between the first template and the third template, a second mold is mounted between the second template and the third template, one of the three templates is fixedly mounted on the frame, and the template of the three templates that is not fixedly mounted on the frame is slidably connected to the frame. The productivity of the injection molding machine of the present application is the same as that of two conventional injection molding machines, but the space occupied is saved by 1 / 3 compared with the two injection molding machines, and at the same time, the manufacturing cost of the injection molding machine can be reduced and the mold clamping accuracy can be ensured.

Description

Technical Field

[0001] The invention relates to the field of injection molding, and in particular to a reverse injection molding machine and a control method thereof. Background Art

[0002] Injection molding machine is also called injection molding machine or injection unit. It is the main molding equipment that uses plastic molding molds to make plastic products of various shapes from thermoplastics or thermosetting plastics. It is divided into vertical, horizontal and all-electric types. The injection molding machine can heat the plastic and apply high pressure to the molten plastic to make it eject and fill the mold cavity. Most of the injection molding machines on the market are single-color injection molding machines and two-color opposite-shot injection molding machines.

[0003] As we all know, the existing single-color injection molding technology uses a production method in which one injection molding machine is equipped with a set of molds. This one-out-of-one production method is not only inefficient, but also requires multiple injection molding machines for mass production. The injection molding machine occupies a large amount of site space, and the site space for placing the injection molding machine is limited. When producing large quantities of plastic products, multiple injection molding machines are required to work at the same time, which greatly increases the demand for site size and energy consumption costs. Summary of the invention

[0004] In order to solve the above technical problems, the present application provides a double-shot injection molding machine to solve the problem that large-scale injection molding machines occupy a large space. Different from traditional injection molding machines, the present invention adopts three templates for injection molding production. Under the same conditions as the productivity of two traditional injection molding machines, the two injection units share a clamping device and a frame, which saves 1 / 3 of the space and ensures the accuracy of mold closing.

[0005] To achieve the above-mentioned purpose, the present application is implemented by the following scheme: a double-shot injection molding machine, comprising a frame, a clamping device and an injection device; the injection device comprises a first injection unit and a second injection unit, the first injection unit, the second injection unit and the clamping device are installed on the frame, the clamping device is arranged between the first injection unit and the second injection unit, the clamping device comprises a first template, a second template and a third template, the first template is close to the first injection unit, the second template is close to the second injection unit, the third template is arranged between the first template and the second template, an external first mold is installed between the first template and the third template, an external second mold is installed between the second template and the third template, one of the first template, the second template and the third template is fixedly installed on the frame, and the template of the first template, the second template and the third template that is not fixedly installed with the frame is slidably connected with the frame, and during operation, the first injection unit and the first template move in the same direction on the frame, or the second injection unit and the second template move in the same direction on the frame to complete the action of closing or opening the mold.

[0006] Preferably, the locking device also includes a booster cylinder, a pull rod, a mold shifting mechanism, a sliding foot mechanism and a brake mechanism. The first template is fixedly mounted on the frame, the booster cylinder is fixedly mounted on the first template, one end of the pull rod passes through the first template and is connected to the booster cylinder, the other end of the pull rod passes through the third template and the second template and is installed in the brake mechanism on the back of the second template, the sliding foot mechanism is also provided at the bottom ends of the third template and the second template, the mold shifting mechanism is arranged between the first template and the third template and between the second template and the first template, and is used for closing and opening the first mold and the second mold; driven by the sliding foot mechanism, the third template can be moved on the frame or the pull rod, and the brake mechanism is used to lock the pull rod and fix the position of the second template after movement.

[0007] Preferably, the mold shifting mechanism includes a mold shifting cylinder, a joint bearing, a locating pin and a mold shifting hinge seat, one end of the piston rod of the mold shifting cylinder is fixedly connected to one end of the joint bearing, the other end of the joint bearing is connected to the mold shifting hinge seat through the locating pin, and the mold shifting hinge seat is fixedly connected to the third template.

[0008] Preferably, a first circular hole and a second circular hole are provided on the mold shifting hinge seat, the locating pin includes a first locating pin and a second locating pin, the joint bearing includes a first joint bearing and a second joint bearing, the mold shifting cylinder includes a first mold shifting cylinder and a second mold shifting cylinder, the first mold shifting cylinder is fixedly installed on the first template, and the second mold shifting cylinder is fixedly installed on the second template, the piston rod of the first mold shifting cylinder is connected to one end of the first joint bearing, and the other end of the first joint bearing is installed in the first circular hole through the first locating pin; the piston rod of the second mold shifting cylinder is connected to one end of the second joint bearing, and the other end of the second joint bearing is installed in the second circular hole through the second locating pin; the first mold shifting cylinder drives the third template to translate, and the second mold shifting cylinder drives the second template to translate, and in the process of closing and opening the first mold and the second mold, the closing and opening actions of the first mold and the second mold are synchronized.

[0009] Preferably, the sliding foot mechanism includes a sliding foot, an inclined iron, a pad, a baffle and an adjusting screw. The bottom of the sliding foot is set with a certain slope, the inclined iron also has a certain slope and is adapted to the sliding foot, the pad is fixedly installed on the bottom of the inclined iron, the baffle is installed on the front side of the sliding foot, and the adjusting screw is installed to connect the baffle and the inclined iron.

[0010] Preferably, the sliding foot mechanism also includes a transmission gear, a gear shaft, a drive motor and a rack, the drive motor is fixedly mounted on the inner side of the sliding foot, the gear shaft is fixedly connected to the drive motor, the gear shaft is meshingly connected to the transmission gear, the rack is meshingly connected to the transmission gear and the gear shaft, and the rack is fixedly connected to the bevel iron.

[0011] Preferably, a position signal generator is fixedly installed at the center position of the side of the second template and the first template, and two position signal receivers are fixedly installed at the center position of the side of the third template. The position signal receivers receive the signals sent by the position signal generators and determine whether the first template and the second template are at the same height as the center position of the third template.

[0012] Alternatively, the locking device includes a booster cylinder, a pull rod and a brake mechanism, wherein the booster cylinder and the brake mechanism are arranged on the same side of the second template, one end of the pull rod is fixedly connected to the first template, and the other end passes through the third template, the second template and the brake mechanism in sequence and is connected to the booster cylinder.

[0013] At the same time, the present invention also proposes a control method for a double-shot injection molding machine, comprising the steps of:

[0014] S1. A first template, a third template, and a second template are arranged on a frame. If the first template is fixedly mounted on the frame, the third template and the second template are slidably connected to the frame, a first injection unit is arranged near the first template, and a second injection unit is arranged near the second template. A first mold and a second mold of an external device are respectively installed on both sides of the third template;

[0015] S2. The position signal receiver on the third template receives the signal sent by the signal generator on the first template, and determines whether the center positions of the third template and the first template are at the same horizontal height, and drives the sliding foot mechanism to adjust the height of the center position of the third template to be the same as the height of the center position of the first template; The position signal receiver on the third template receives the signal sent by the signal generator on the second template, and determines whether the center positions of the second template and the third template are at the same horizontal height, and adjusts the height of the center position of the second template to be the same as the height of the center position of the third template;

[0016] S3. After the injection device completes plasticization, the third template is translated toward the first template, and the second template is translated toward the third template. At the same time, the second injection unit on the second template side moves synchronously with the second template and the relative position remains stationary until the first mold and the second mold on both sides of the third template are closed, the first mold and the second mold are closed synchronously, and the brake mechanism locks the pull rod and fixes the position of the second template and the third template;

[0017] S4. After the first mold and the second mold are closed, the first injection unit and the second injection unit simultaneously inject the molten material into the first mold and the second mold at a certain speed and pressure, and cool the inside of the mold cavity of the first mold and the second mold at a preset value;

[0018] S5. After the pressure holding and cooling are completed, the position of the second template is unlocked and the mold is opened. The second injection unit on the second template side and the second template and the third template move in the opposite direction of the first template, and keep synchronization during the movement. When the third template and the second template reach the preset position, the product is ejected, and the injection device starts pre-plasticization at the same time to complete one cycle of injection molding.

[0019] Compared with the prior art, the present application adopts a method in which two injection units share one frame, a set of molds is installed between every two templates, and two injection units inject two sets of molds at the same time. Two sets of molds are injected on the same frame, breaking through the traditional injection molding method of producing a set of mold products in one injection. Because they share one frame and one set of clamping devices, the space utilization rate and economic cost are far lower than the consumption of two injection molding machines.

[0020] Compared with the existing two-color opposite-shot injection molding machine, no turntable is arranged at the bottom of the third template, and a height-adjustable sliding foot mechanism is adopted, which not only reduces the complexity of the machine, but also saves the turntable rotation time and manufacturing cost.

[0021] Arranging a position signal generator on the first template and the second template and a position signal receiver on the third template can determine whether the centers of the three templates are at the same horizontal height before injection molding, which can improve the mold closing accuracy during injection molding; using a motor to adjust the sliding foot mechanism and adopting a gear rack transmission method can improve the accuracy of fine-tuning the sliding foot and reduce the complexity of workers' operations. When one motor adjusts one sliding foot mechanism, the inclined irons on both sides of the sliding foot can maintain synchronization and the same precision of displacement, avoiding the problem of template tilting due to inconsistent movement of the left and right inclined irons.

[0022] The mold shifting cylinder does not provide clamping force, so the diameter of the mold shifting cylinder is much smaller than that of the booster cylinder, which is beneficial to increasing the movement speed of the third template and the second template; by adjusting the oil inlet speed of the mold shifting cylinder, the movement speed of the first template relative to the second template and the movement speed of the third template relative to the second template make the closing and opening of the two clamped molds synchronized, and during the mold opening process, the mold opening can be stopped only when it reaches the preset position, which is beneficial to accurately control the injection cycle and improve the injection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a diagram of a shot-to-shot injection molding machine;

[0024] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0025] Figure 3 It is a cross-sectional view of the sliding foot mechanism;

[0026] Figure 4 It is a flow chart of the control method of the shot injection molding machine of the present application;

[0027] In the figure, 1, frame; 2, first injection unit; 2', second injection unit; 3, second template; 4, third template; 5, first template; 6, brake mechanism; 7, slide mechanism; 8, pull rod; 9, booster cylinder; 10, position signal generator; 11, position signal receiver; 12, mold shifting mechanism; 13, mold shifting cylinder; 131, first mold shifting cylinder; 132, second mold shifting cylinder; 14, mold shifting piston rod; 141, first mold shifting piston rod; 142, second mold shifting piston rod; 41, joint bearing; 411, first joint bearing; 412, second joint bearing; 42, mold shifting hinge; 43, locating pin; 431, first locating pin; 432, second locating pin; 71, slide; 72, inclined iron; 73, pad; 74, adjusting screw; 75, baffle; 76, rack; 77, transmission gear; 78, gear shaft; DETAILED DESCRIPTION

[0028] The present application is described in detail below, and examples of embodiments of the present application are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar components or components with the same or similar functions. In addition, if the detailed description of the known technology is unnecessary for the features of the present application shown, it will be omitted. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be interpreted as limiting the present application.

[0029] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with those in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless specifically defined as here.

[0030] Those skilled in the art will appreciate that, unless expressly stated otherwise, the singular forms "a", "an", "" and "the" used herein may also include the plural forms. It should be further understood that the term "comprising" used in the specification of the present application refers to the presence of features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when we refer to an element as being "connected" or "coupled" to another element, it may be directly connected or coupled to the other elements, or there may be intermediate elements. In addition, "connected" or "coupled" as used herein may include wireless connections or wireless couplings. The term "and / or" as used herein includes all or any unit and all combinations of one or more associated listed items.

[0031] like Figure 1-3As shown, the present invention discloses a counter-injection molding machine, comprising a frame 1, a clamping device and an injection device; the injection device comprises a first injection unit 2 and a second injection unit 2', the first injection unit 2 and the second injection unit 2' and the clamping device are installed on the frame 1, the clamping device is arranged between the first injection unit 2 and the second injection unit 2', the clamping device comprises a first template 5, a second template 3 and a third template 4, the first template 5 is close to the first injection unit 2, the second template 3 is close to the second injection unit 2', the third template 4 is arranged between the first template 5 and the second template 3, an external first mold is installed between the first template 5 and the third template 4, an external second mold is installed between the second template 3 and the third template 4, one of the first template 5, the second template 3 and the third template 4 is fixedly installed on the frame 1, and the template that is not fixedly installed with the frame 1 among the first template 5, the second template 3 and the third template 4 is slidably connected with the frame 1, during operation, the first injection unit 2 and the first template 5 move in the same direction on the frame 1, or the second injection unit 2' and the second template 3 move in the same direction on the frame 1, so as to complete the action of closing or opening the mold.

[0032] There is a preferred solution, such as Figure 1 As shown, the locking device also includes a booster cylinder 9, a pull rod 8, a mold shifting mechanism 12, a sliding foot mechanism 7 and a brake mechanism 6. The first template 5 is fixedly installed on the frame 1, the booster cylinder 9 is fixedly installed on the first template 5, one end of the pull rod 8 passes through the first template 5 and is connected to the booster cylinder 9, and the other end of the pull rod 8 passes through the third template 4 and the second template 3 and is installed in the brake mechanism 6 on the back of the second template 3. The third template 4 and the second template 3 are also provided with a sliding foot mechanism 7 at the bottom end. The mold shifting mechanism 12 is arranged between the first template 5 and the third template 4 and between the second template 3 and the first template 5, and is used for closing and opening the first mold and the second mold; driven by the sliding foot mechanism 7, the third template 4 can move on the frame 1 or on the pull rod 8, and the brake mechanism 6 is used to lock the pull rod 8 and fix the position of the second template 3 after moving.

[0033] There is a preferred solution, such as Figure 1 and Figure 2 As shown, the mold shifting mechanism 12 includes a mold shifting cylinder, a joint bearing 41, a locating pin 43 and a mold shifting hinge seat 42. One end of the piston rod 14 of the mold shifting cylinder is fixedly connected to one end of the joint bearing 41, and the other end of the joint bearing 41 is connected to the mold shifting hinge seat 42 through the locating pin 43. The mold shifting hinge seat 42 is fixedly connected to the third mold plate 4.

[0034] The mold shifting hinge seat 42 is provided with a first circular hole and a second circular hole, the positioning pin 43 includes a first positioning pin 43143 and a second positioning pin 43243, the joint bearing 41 includes a first joint bearing 41141 and a second joint bearing 41241, the mold shifting cylinder includes a first mold shifting cylinder 131 and a second mold shifting cylinder 132, the first mold shifting cylinder 131 is fixedly mounted on the first template 5, the second mold shifting cylinder 132 is fixedly mounted on the second template 3, the piston rod 14 of the first mold shifting cylinder 131 is connected to one end of the first joint bearing 41141, and the second mold shifting cylinder 132 is fixedly mounted on the second template 3. The other end of a joint bearing 41141 is installed in the first circular hole through a first locating pin 43143; the piston rod 14 of the second mold shifting cylinder 132 is connected to one end of the second joint bearing 41241, and the other end of the second joint bearing 41241 is installed in the second circular hole through a second locating pin 43243; the first mold shifting cylinder 131 drives the third mold plate 4 to translate, and the second mold shifting cylinder 132 drives the second mold plate 3 to translate. During the closing and opening process of the first mold and the second mold, the closing and opening actions of the first mold and the second mold are synchronized.

[0035] There is a preferred solution, such as Figure 3 As shown, the sliding foot mechanism 7 includes a sliding foot 71, an inclined iron 72, a pad 73, a baffle 75 and an adjusting screw 74. The bottom of the sliding foot 71 is set with a certain slope, and the inclined iron 72 also has a certain slope and is adapted to the sliding foot 71. The pad 73 is fixedly installed at the bottom of the inclined iron 72, the baffle 75 is installed on the front side of the sliding foot 71, and the adjusting screw 74 is installed to connect the baffle 75 and the inclined iron 72.

[0036] The sliding foot mechanism 7 also includes a transmission gear 77, a gear shaft 78, a driving motor and a rack 76. The driving motor is fixedly mounted on the inner side of the sliding foot 71. The gear shaft 78 is fixedly connected to the driving motor. The gear shaft 78 is meshedly connected with the transmission gear 77. The rack 76 is meshedly connected with the transmission gear 77 and the gear shaft 78. The rack 76 is fixedly connected to the bevel iron 72.

[0037] There is a preferred solution, such as Figure 1 As shown, a position signal generator 10 is fixedly installed at the center position of the side of the second template 3 and the first template 5, and two position signal receivers 11 are fixedly installed at the center position of the side of the third template 4. The position signal receiver 11 receives the signal sent by the position signal generator 10 and determines whether the first template 5 and the second template 3 are at the same height as the center position of the third template 4.

[0038] In a specific embodiment, before injection molding, the height position of the third template 4 and the second template 3 is adjusted, such as Figure 1As shown, when the mold is installed to the left and right sides of the third template 4, the position signal generator 10 on the first template 5 sends a signal, which is received by the position signal receiver 11 on the third template 4 and determines whether the center positions of the third template 4 and the first template 5 are at the same height. At this time, they are not at the same height, and the driving motor drives the gear shaft 78 to rotate, and the gear shaft 78 drives the transmission gear 77 to rotate. The left and right racks 76 move to the left and right respectively under the engagement of the gear shaft 78 and the transmission gear 77, and the rack 76 drives the bevel iron 72 to move. When the center positions of the third template 4 and the first template 5 are adjusted to the same height, tighten the adjusting screw 74 to fix the position of the bevel iron 72 and the sliding foot 71, and the third mold is completed. The position height of the plate 4 is adjusted; then the position signal generator 10 on the second template 3 sends a signal, which is received by the position signal receiver 11 on the third template 4 and determines whether the center positions of the third template 4 and the second template 3 are at the same height. If they are not at the same height at this time, the driving motor starts to drive the gear shaft 78 to rotate, and the gear shaft 78 drives the transmission gear 77 to rotate. The left and right racks 76 move to the left and right respectively under the meshing of the gear shaft 78 and the transmission gear 77, and the rack 76 drives the inclined iron 72 to move. When the center positions of the third template 4 and the first template 5 are adjusted to the same height, tighten the adjusting screw 74 to fix the positions of the inclined iron 72 and the sliding foot 71, and complete the position height adjustment of the second template 3;

[0039] Start mold closing, such as Figure 1 As shown, the first mold-shifting oil cylinder 131 is driven to drive the first mold-shifting piston rod 141 to move. Since the first mold-shifting piston rod 141 and the third mold plate 4 are fixed, the third mold plate 4 also moves with the first mold-shifting piston rod 141. At the same time, the second mold-shifting oil cylinder 132 is driven. Since the second mold-shifting oil cylinder 132 is fixed on the second mold plate 3 and the second mold plate 3 is slidable on the frame 1, the second mold plate 3 moves toward the third mold plate 4 under the pull of the second mold-shifting piston rod 142. At this time, the moving speeds of the third mold plate 4 and the second mold plate 3 are adjusted so that the mold closing of the two clamped molds is synchronized, that is, the mold closing actions of the third mold plate 4 and the first mold plate 5 and the third mold plate 4 and the second mold plate 3 are completed simultaneously;

[0040] After the mold is completed, Figure 1 As shown, the brake mechanism 6 fixes the positions of the second template 3 and the third template 4; thereafter, the first injection unit 2 and the second injection unit 2' inject into the two molds respectively, and the molds are opened after pressure holding and cooling. The mold opening action and the unlocking action of the brake mechanism 6 are exactly opposite to the previous ones, and the moving speed of the third template 3 and the second template 3 are adjusted so that the closing of the two clamped molds is synchronized, until the third template 4 and the second template 3 reach the preset position and the product is ejected, completing a cycle of injection molding.

[0041] There is a supplementary solution, the locking device includes a booster cylinder 9, a pull rod 8 and a brake mechanism 6, the booster cylinder 9 and the brake mechanism 6 are arranged on the same side of the second template 4, one end of the pull rod 8 is fixedly connected to the first template 5, and the other end passes through the third template 4, the second template 3 and the brake mechanism 6 in sequence and is connected to the booster cylinder 9.

[0042] See also Figure 4 , Figure 4 The present invention is a flow chart of a control method for a three-plate injection molding machine. As shown in the figure, the method includes the following steps:

[0043] S1. A first template 5, a third template 4, and a second template 3 are arranged on the frame 1. If the first template 5 is fixedly mounted on the frame 1, the third template 4 and the second template 3 are slidably connected to the frame 1, a first injection unit 2 is arranged near the first template 5, a second injection unit 2' is arranged near the second template 3, and a first mold and a second mold of an external device are respectively installed on both sides of the third template 4;

[0044] S2. The position signal receiver 11 on the third template 4 receives the signal from the signal generator on the first template 5, and determines whether the center positions of the third template 4 and the first template 5 are at the same horizontal height, and drives the sliding foot mechanism 7 to adjust the height of the center position of the third template 4 to be the same as the center position height of the first template 5; The position signal receiver 11 on the third template 4 receives the signal from the signal generator on the second template 3, and determines whether the center positions of the second template 3 and the third template 4 are at the same horizontal height, and adjusts the height of the center position of the second template 3 to be the same as the center position height of the third template 4;

[0045] S3. After the injection device completes plasticization, the third template 4 is translated toward the first template 5, and the second template 3 is translated toward the third template 4. At the same time, the second injection unit 2' on the second template 3 side moves synchronously with the second template 3 and the relative position remains stationary until the first mold and the second mold on both sides of the third template 4 are closed, the first mold and the second mold are closed synchronously, and the brake mechanism 6 locks the pull rod 8 and fixes the position of the second template 3 and the third template 4;

[0046] S4. After the first mold and the second mold are closed, the first injection unit 2 and the second injection unit 2' simultaneously inject the molten material into the first mold and the second mold at a certain speed and pressure, and the first mold and the second mold are pressure-cooled inside the mold cavity according to a preset value;

[0047] S5. After the pressure-holding cooling is completed, the position of the second template 3 is unlocked, and the mold is opened. The second injection unit 2' and the second template 3 and the third template 4 on the side of the second template 3 move in the opposite direction of the first template 5, and keep synchronization during the movement. When the third template 4 and the second template 3 reach the preset position, the product is ejected, and the injection device starts pre-plasticization at the same time, completing a cycle of injection molding.

[0048] To sum up, the present application is different from the existing single-color injection molding machines and two-color shot machines. Two injection units are installed on the same frame, and a movable third template and a second template are installed at the same time. Not only is the space cost far lower than two injection molding machines with the same productivity, but the injection efficiency is also significantly improved. The use of motors and gears to drive the inclined irons on both sides of the sliding foot mechanism avoids the problem of insufficient manual operation precision, while also reducing the difficulty of adjusting the sliding foot height and increasing the precision when closing the mold. By controlling the speed of the mold moving cylinder, during the closing and opening process of the mold, the moving speed of the third template relative to the first template is equal to the moving speed of the second template relative to the third template, so that the closing and opening of the first mold and the second mold are synchronized, which is conducive to precise control of the injection molding cycle and improved injection molding efficiency.

[0049] Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims

1. A reverse injection molding machine, characterized in that: The invention comprises a frame, a mold locking device and an injection device; the injection device comprises a first injection unit and a second injection unit, the first injection unit, the second injection unit and the mold locking device are installed on the frame, the mold locking device is arranged between the first injection unit and the second injection unit, the mold locking device comprises a first template, a second template and a third template, the first template is close to the first injection unit, the second template is close to the second injection unit, the third template is arranged between the first template and the second template, an external first mold is installed between the first template and the third template, an external second mold is installed between the second template and the third template, one of the first template, the second template and the third template is fixedly installed on the frame, the template of the first template, the second template and the third template that is not fixedly installed with the frame is slidably connected with the frame, and during operation, the second injection unit and the second template move in the same direction on the frame to complete the action of mold closing or mold opening; The mold locking device also includes a booster cylinder, a pull rod, a mold shifting mechanism, a sliding foot mechanism and a brake mechanism. The first template is fixedly mounted on the frame, the booster cylinder is fixedly mounted on the first template, one end of the pull rod passes through the first template and is connected to the booster cylinder, the other end of the pull rod passes through the third template and the second template and is installed in the brake mechanism on the back of the second template. The third template and the second template are also provided with the sliding foot mechanism at the bottom ends. The mold shifting mechanism is arranged between the second template and the first template, and is used for closing and opening the first mold and the second mold. Driven by the sliding foot mechanism, the third template can move on the frame or the pull rod, and the brake mechanism locks the pull rod and fixes the position of the second template after it moves. A position signal generator is fixedly installed at the center position of the side of the second template and the first template, and two position signal receivers are fixedly installed at the center position of the side of the third template. The position signal receivers receive the signals sent by the position signal generator and determine whether the first template and the second template are at the same height as the center position of the third template.

2. The reverse injection molding machine according to claim 1, further characterized in that: The mold shifting mechanism includes a mold shifting cylinder, a joint bearing, a locating pin and a mold shifting hinge seat. One end of the piston rod of the mold shifting cylinder is fixedly connected to one end of the joint bearing, and the other end of the joint bearing is connected to the mold shifting hinge seat through the locating pin. The mold shifting hinge seat is fixedly connected to the third template.

3. The reverse injection molding machine according to claim 2, further characterized in that: The mold shifting hinge seat is provided with a first circular hole and a second circular hole, the positioning pin includes a first positioning pin and a second positioning pin, the joint bearing includes a first joint bearing and a second joint bearing, the mold shifting cylinder includes a first mold shifting cylinder and a second mold shifting cylinder, the first mold shifting cylinder is fixedly mounted on the first template, the second mold shifting cylinder is fixedly mounted on the second template, the piston rod of the first mold shifting cylinder is connected to one end of the first joint bearing, and the other end of the first joint bearing is mounted in the first circular hole through the first positioning pin; The piston rod of the second mold-shifting cylinder is connected to one end of the second joint bearing, and the other end of the second joint bearing is installed in the second circular hole through the second locating pin; the first mold-shifting cylinder drives the third template to translate, and the second mold-shifting cylinder drives the second template to translate, and during the mold closing and mold opening process of the first mold and the second mold, the mold closing and mold opening actions of the first mold and the second mold are synchronized.

4. The reverse injection molding machine according to claim 1, further characterized in that: The sliding foot mechanism includes a sliding foot, an inclined iron, a pad, a baffle and an adjusting screw. The bottom of the sliding foot is set with a certain slope, and the inclined iron also has a certain slope and is adapted to the sliding foot. The pad is fixedly installed on the bottom of the inclined iron, and the baffle is installed on the front side of the sliding foot. The adjusting screw is installed to connect the baffle and the inclined iron.

5. The reverse injection molding machine according to claim 4, further characterized in that: The slide mechanism also includes a transmission gear, a gear shaft, a drive motor and a rack. The drive motor is fixedly mounted on the inner side of the slide, the gear shaft is fixedly connected to the drive motor, the gear shaft is meshed with the transmission gear, the rack is meshed with the transmission gear and the gear shaft, and the rack is fixedly connected to the bevel iron.

6. The reverse injection molding machine according to claim 1, further characterized in that: The clamping device includes a booster cylinder, a pull rod and a brake mechanism. The booster cylinder and the brake mechanism are arranged on the same side of the second template. One end of the pull rod is fixedly connected to the first template, and the other end passes through the third template, the second template and the brake mechanism in sequence and is connected to the booster cylinder.

7. A control method for a shot injection molding machine, wherein the injection molding machine is the injection molding machine according to any one of claims 1 to 6, characterized in that: S1. A first template, a third template, and a second template are arranged on a frame, wherein the first template is fixedly mounted on the frame, the third template and the second template are slidably connected to the frame, a first injection unit is arranged near the first template, a second injection unit is arranged near the second template, and a first mold and a second mold of an external device are respectively installed on both sides of the third template; S2. The position signal receiver on the third template receives the signal sent by the signal generator on the first template, and determines whether the center positions of the third template and the first template are at the same horizontal height, and drives the sliding foot mechanism to adjust the height of the center position of the third template to be the same as the height of the center position of the first template; The position signal receiver on the third template receives the signal sent by the signal generator on the second template, and determines whether the center positions of the second template and the third template are at the same horizontal height, and adjusts the height of the center position of the second template to be the same as the height of the center position of the third template; S3. After the injection device completes plasticization, the third template is translated toward the first template, and the second template is translated toward the third template. At the same time, the second injection unit on the second template side moves synchronously with the second template and the relative position remains stationary until the first mold and the second mold on both sides of the third template are closed, the first mold and the second mold are closed synchronously, and the brake mechanism locks the pull rod and fixes the position of the second template and the third template; S4. After the first mold and the second mold are closed, the first injection unit and the second injection unit simultaneously inject the molten material into the first mold and the second mold at a certain speed and pressure, and cool the inside of the mold cavity of the first mold and the second mold at a preset value; S5. After the pressure holding and cooling are completed, the position of the second template is unlocked and the mold is opened. The second injection unit on the second template side and the second template and the third template move in the opposite direction of the first template, and keep synchronization during the movement. When the third template and the second template reach the preset position, the product is ejected, and the injection device starts pre-plasticization at the same time to complete one cycle of injection molding.

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