A double-station opening and closing model blow molding machine

Abstract

The present invention discloses a double-station opening and closing model blow molding machine, including a base frame, two opening and closing mold mechanisms arranged side by side are provided on the base frame, an upper platform is provided above the base frame, an extrusion mechanism is provided on the upper platform, the end of the extrusion mechanism is connected to a die head provided above the opening and closing mold mechanism, a swing mechanism is provided on the upper platform, the swing mechanism includes a swing frame, a rotating table is provided below the end of the swing frame away from the die head, the rotating table is installed on the upper platform, a plurality of track wheels are rotatably connected to the swing frame, a plurality of arc tracks matching the track wheels are provided on the upper platform, the plurality of arc tracks are all arranged with the rotating table as the center of a circle, and a swing drive assembly is provided on one side of the swing frame along the direction from the die head to the rotating table. The beneficial effects of the present invention are: continuous feeding of the two opening and closing mold mechanisms is achieved, shortening the product molding cycle; high work efficiency, ensuring continuous production of products; ingenious structural design, easy assembly and adjustment, and light weight of the entire equipment, which is conducive to improving control accuracy.

Description

Technical Field

[0001] The invention relates to the technical field of blow molding machines, in particular to a double-station opening and closing model blow molding machine. Background Art

[0002] Blow molding, also known as hollow blow molding, is a rapidly developing plastics processing method. A tubular plastic preform, obtained by extrusion or injection molding of a thermoplastic resin, is placed in a split mold while hot (or heated to a softened state). Immediately after the mold is closed, compressed air is introduced into the preform, causing it to expand and adhere tightly to the mold's inner wall. After cooling and demolding, various hollow products are obtained. Blow molding can be divided into extrusion blow molding and injection blow molding. Blow molding machines are a type of plastics processing machine and can be divided into three categories: extrusion blow molding machines, injection blow molding machines, and special-structure blow molding machines. Existing blow molding machines are mostly single-station machines, meaning that each die head has a corresponding mold opening and closing mechanism. The process involves extruding the preform from the die head, closing the mold head, blowing to set the shape, cooling, and then opening the mold for unloading. The die head must stop extruding material after closing the mold head and before opening the mold head, even though it can continue to feed and extrude material. This results in significant time waste and affects production efficiency. Some are large double-station blow molding machines, but the extrusion system is fixed, and the double-station mold opening and closing device moves alternately left and right to clamp the material embryo extruded by the die head. This method has the problem that the mold opening and closing device occupies a large area, increasing investment costs; and the double-station mold opening and closing device moves alternately left and right, which takes up molding cycle time and has low output. There are also double-injection barrels, double mold heads and double opening and closing mechanisms to achieve double-station blow molding, such as a new double-station blow molding machine disclosed in patent publication number CN214214712U. Its structure is complex, large, heavy, and occupies a large area. Not only is the investment cost high, but the assembly and operation are also difficult, which is not conducive to precise control. Summary of the Invention

[0003] The object of the present invention is to provide a double-station opening and closing mold blow molding machine to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a double-station opening and closing model blow molding machine, comprising a base frame, wherein the base frame is provided with two opening and closing mold mechanisms arranged side by side, an upper platform is mounted above the base frame, an extrusion mechanism is arranged on the upper platform, the end of the extrusion mechanism is connected to a die head mounted above the opening and closing mold mechanism, and a swing mechanism is provided on the upper platform, wherein the swing mechanism includes a swing frame, the extrusion mechanism and the die head are mounted on the swing frame, a rotating table is provided below the swing frame away from the die head end, the rotating table is mounted on the upper platform, a plurality of track wheels are rotatably connected to the swing frame, and the plurality of track wheels are symmetrically arranged on both sides of the swing frame along the direction from the die head to the rotating table, a plurality of arc tracks matching the track wheels are provided on the upper platform, and the plurality of arc tracks are all arranged with the rotating table as the center of a circle, and a swing drive assembly is provided on one side of the swing frame along the direction from the die head to the rotating table.

[0005] Further preferably, the swing drive assembly includes a swing motor, which is vertically slidably mounted on the side of the swing frame. The lower output shaft of the swing motor is connected to a second gear, which is meshedly connected to a second rack, and the second rack is horizontally mounted on the upper platform. The swing motor can drive the second gear to rotate, so that the second gear can move back and forth along the second rack, driving the swing motor to move back and forth, thereby driving the swing frame to swing back and forth.

[0006] Further preferably, two second linear guide rails arranged in parallel up and down are provided between the swing motor and the swing frame to ensure a firm connection between the swing motor and the swing frame, and to ensure that the swing motor slides smoothly and stably relative to the swing frame; the guide rail of the second linear guide rail is installed on the swing frame, and the slider of the second linear guide rail is connected to the swing motor.

[0007] Further preferably, the second gear and the second rack are both installed in the channel steel to protect the second gear and the second rack.

[0008] Further preferably, a plurality of columns are provided on the edge of the base frame to support the upper platform; a lifting assembly is provided at the upper end of each of the columns, and the lifting assembly is connected to the upper platform, and the lifting and lowering of the upper platform is achieved through the lifting assembly to achieve height adjustment of the upper platform.

[0009] Further preferably, the lifting assembly includes a lifting motor and a lifting screw, the lifting screw being vertically mounted on the column, the upper end of the lifting screw being connected to the upper platform, and a lifting gearbox being connected between the lifting screw and the lifting motor. The lifting gearbox is capable of converting the rotation of the lifting motor into the vertical linear motion of the lifting screw, that is, the lifting motor can drive the lifting screw up and down through the lifting gearbox to achieve the raising and lowering of the upper platform.

[0010] Further preferably, the extrusion mechanism includes an injection barrel, the injection end of which is connected to the die head. A material-spinning motor and a hopper are provided at the end of the injection barrel remote from the die head, and the material-spinning motor is connected to a reducer. The rubber motor drives a screw in the injection barrel to rotate, thereby conveying plastic pellets in the hopper into the injection barrel and driving the plastic pellets toward the nozzle. The plastic pellets melt into a plastic melt within the injection barrel, which is continuously conveyed toward the nozzle by the screw and ultimately injected into the die head, achieving extrusion and loading.

[0011] Further preferably, the mold opening and closing mechanism comprises three mold plates, a first mold plate, a second mold plate, and a third mold plate, which are arranged in parallel in sequence. Two pull rods are connected between the first mold plate and the third mold plate, and the pull rods move through the second mold plate. A mold opening and closing cylinder is installed in the middle of the third mold plate, and the piston rod end of the mold opening and closing cylinder is vertically connected to the second mold plate. The third mold plate is provided with two mold locking cylinders parallel to the mold opening and closing cylinders, and the two mold locking cylinders are symmetrically arranged on both sides of the mold opening and closing cylinders. The piston rods of the mold locking cylinders are vertically connected to the second mold plate. The first mold plate and the second mold plate are used for the installation of the mold. The mold opening and closing cylinders can push the second mold plate to move toward or away from the first mold plate to realize the mold closing or mold opening action. The mold locking during mold closing is realized by the mold locking cylinder to ensure the molding quality of the product.

[0012] Further preferably, the second template is slidably set on the base frame, and a first linear guide rail is provided between the second template and the base frame to ensure smooth movement of the second template; the first template and the third template are respectively fixed at both ends of the guide rail of the first linear guide rail to facilitate the installation and adjustment of the first template and the third template.

[0013] Further preferably, a buffer assembly is provided between the second and third templates, the buffer assembly comprising a first gear and a first rack. The first gear is mounted on a base frame, and two first racks are disposed on upper and lower sides of the first gear and are both meshed with the first gear. One of the two first racks is fixedly connected to the second template, and the other of the two first racks is fixedly connected to the third template. The meshing transmission between the two first racks and the first gear can reduce the speed and impact of the second template's movement, providing a stabilizing effect and ensuring smooth opening and closing of the mold opening and closing mechanism.

[0014] Beneficial effects: The double-station opening and closing model blow molding machine of the present invention realizes continuous feeding of the two opening and closing mold mechanisms through a swing mechanism, which can prevent the plastic melt from being stored in the die head for a long time to cause black material, and then cause material waste, thereby saving materials and reducing costs; the two opening and closing mold mechanisms work alternately, with high working efficiency, which can ensure continuous production of products, shorten the product molding cycle, and increase output; the die head can be moved back and forth through the swing mechanism, the structure is simple, easy to process and maintain, and the cost is low, the occupied area is small, the weight is light, and it is conducive to improving control accuracy; the blow molding machine has a clever structural design, is easy to assemble and adjust, and is simple to operate and has high production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the axial structure of the double-station opening and closing model blow molding machine disclosed in an embodiment of the present invention;

[0016] Figure 2 This is a schematic diagram of the main structure of a double-station opening and closing model blow molding machine disclosed in an embodiment of the present invention;

[0017] Figure 3 This is a schematic diagram of the axonometric structure of a double-station opening and closing model blow molding machine without a guardrail disclosed in an embodiment of the present invention;

[0018] Figure 4 A schematic structural diagram of the swing mechanism disclosed in an embodiment of the present invention;

[0019] Figure 5 for Figure 4 A schematic diagram of the enlarged structure of the structure at A in the middle;

[0020] Figure 6 A schematic structural diagram of the mold opening and closing mechanism disclosed in an embodiment of the present invention;

[0021] Figure 7 for Figure 6 Schematic diagram of the enlarged structure of the structure at point B in the middle.

[0022] Figure markings: 1-base frame, 2-column, 3-upper platform, 4-extrusion mechanism, 41-injection mechanism, 41-injection barrel, 42-cranking motor, 43-hopper, 5-die head, 6-mold opening and closing mechanism, 61-first template, 62-second template, 63-third template, 64-pull rod, 65-mold opening and closing cylinder, 66-locking cylinder, 67-first linear guide, 68-buffer assembly, 681-first gear, 682-first rack, 7-swing mechanism, 71-swing frame, 72-rotating table, 73-track wheel, 74-track, 75-swing drive assembly, 751-swing motor, 752-second gear, 753-second rack, 754-second linear guide, 755-channel steel, 8-lifting assembly, 81-lifting motor, 82-lifting screw, 9-mold. DETAILED DESCRIPTION

[0023] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments. Example

[0024] like Figure 1-7As shown, a double-station opening and closing mold blow molding machine includes a base frame 1, on which are two opening and closing mold mechanisms 6 arranged side by side, which can perform alternating molding of two products, with high product production efficiency; an upper platform 3 is mounted above the base frame 1, on which is mounted an extrusion mechanism 4, the end of which is connected to a die head 5 mounted above the opening and closing mold mechanism 6. Plastic particles can be melted by the extrusion mechanism 4 to form a plastic melt, which is then transported into the die head 5 through the extrusion mechanism 4, and then transported into the opening and closing mold mechanism 6 through the die head 5 and blown into the opening and closing mold mechanism 6. After cooling, the product can be obtained. A swing mechanism 7 is mounted on the upper platform 3, which can drive the extrusion mechanism 4 and the die head 5 to move back and forth so that they are respectively aligned with the two opening and closing mold mechanisms 6, thereby achieving continuous feeding of the two opening and closing mold mechanisms 6. The swing mechanism 7 includes a swing frame 71, the extrusion mechanism 4 and the die head 5 are installed on the swing frame 71, and a rotating table 72 is provided below the end of the swing frame 71 away from the die head 5. The rotating table 72 is installed on the upper platform 3, and the rotating table 72 is used as the rotation center and fulcrum of the swing frame 71 to ensure that the swing frame 71 can swing back and forth; a plurality of track wheels 73 are rotatably connected to the swing frame 71, and the plurality of track wheels 73 are symmetrically arranged on both sides of the swing frame 71 along the direction from the die head 5 to the rotating table 72, and a plurality of arc tracks 74 are provided on the upper platform 3 to match the track wheels 73, and the plurality of arc tracks 74 are all arranged with the rotating table 72 as the center of the circle, and a swing drive assembly 75 is provided on one side of the swing frame 71 along the direction from the die head 5 to the rotating table 72. Among them, the track wheel 73 is used to support the swing frame 71. The track wheel 73 is H-shaped and is rolled on the track 74. It can roll along the track 74 and drive the swing frame 71 to swing back and forth with the rotating table 72 as the center; the swing drive assembly 75 is used to drive the swing frame 71 to swing back and forth, so as to switch the die head 5 between the two mold opening and closing mechanisms 6 and to transport the plastic melt to the two mold opening and closing mechanisms 6. In this application, the continuous feeding of the two mold opening and closing mechanisms 6 is achieved through the swing mechanism 7, which can prevent the plastic melt from being stored in the die head 5 for a long time, causing black material, and then causing material waste, thereby saving materials and reducing costs; at the same time, the two mold opening and closing mechanisms 6 work alternately, with high work efficiency; the swing mechanism 7 can realize the forward and backward movement of the die head 5, which has a simple structure, is easy to process and maintain, and has a low cost.

[0025] In the present application, the swing drive assembly 75 includes a swing motor 751, which is vertically slidably mounted on the side of the swing frame 71. The lower output shaft of the swing motor 751 is connected to a second gear 752, which is meshedly connected to a second rack 753. The second rack 753 is horizontally mounted on the upper platform 3. The second rack 753 is arranged in a front-to-back manner. The swing motor 751 can drive the second gear 752 to rotate. The second gear 752 is meshed with the second rack 753, allowing the second gear 752 to move forward and backward along the second rack 753, thereby driving the swing motor 751 to move forward and backward. Since the swing motor 751 is slidably mounted on the swing frame 71, the swing motor 751 can drive the swing frame 71 to move forward and backward, and the swing motor 751 can move back and forth along the side of the swing frame 71. Two second linear guide rails 754 arranged parallel to each other in the upper and lower directions are provided between the swing motor 751 and the swing frame 71 to ensure that the swing motor 751 is firmly connected to the swing frame 71 and that the swing motor 751 slides smoothly relative to the swing frame 71; the guide rail of the second linear guide rail 754 is installed on the swing frame 71, and the slider of the second linear guide rail 754 is connected to the swing motor 751, which facilitates the installation of the second linear guide rail 754 between the swing frame 71 and the swing motor 751.

[0026] In the present application, the second gear 752 and the second rack 753 are both installed in the channel steel 755 to protect the second gear 752 and the second rack 753 and improve the structural safety of the swing drive assembly 75.

[0027] In this application, the edge of the base frame 1 is provided with multiple columns 2 for supporting the upper platform 3; the upper ends of the multiple columns 2 are provided with a lifting assembly 8, which is connected to the upper platform 3. The installation of the lifting assembly 8 ensures that the upper platform 3 can move up and down, facilitating rough alignment between the die head 5 and the mold opening and closing mechanism 6, facilitating the installation of the blow molding machine, and reducing the difficulty of installation. Among them, the lifting assembly 8 includes a lifting motor 81 and a lifting screw 82. The lifting motor 81 can drive the lifting screw 82 to rise and fall, driving the upper platform 3 to rise and fall; the lifting screw 82 is vertically installed on the column 2, the upper end of the lifting screw 82 is connected to the upper platform 3, and a lifting gear box 83 is connected between the lifting screw 82 and the lifting motor 81. In this application, the lifting gearbox 83 is composed of a worm wheel, a worm and a nut, wherein the worm is connected to the output shaft of the lifting motor 81, the worm wheel and the nut are fixedly connected and the nut is screwed to the lifting screw 82. The lifting motor 81 can drive the worm to rotate, and then the worm wheel is driven to rotate by the worm, thereby driving the nut to rotate. The nut and the lifting screw 82 are screwed together, and the rotation of the nut can be converted into the up and down linear motion of the lifting screw, thereby driving the lifting screw to move up and down.

[0028] In this application, the extrusion mechanism 4 includes an injection barrel 41, the injection end of the injection barrel 41 is connected to the die head 5, and the end of the injection barrel 41 away from the die head 5 is provided with a material twisting motor 42 and a hopper 43, and the material twisting motor 42 is connected to a reducer. The material twisting motor 42 can drive the screw in the injection barrel 41 to rotate, and the plastic particles in the hopper 43 are transported into the injection barrel 41, where they are melted and transported to the position of the die head 5, thereby achieving melting and transportation of the plastic particles.

[0029] In the present application, the mold opening and closing mechanism 6 includes three first templates 61, second templates 62 and third templates 63 arranged in parallel in sequence. Two pull rods 64 are connected between the first template 61 and the third template 63. The pull rods 64 move through the second template 62. A mold opening and closing cylinder 65 is installed in the middle of the third template 63. The piston rod end of the mold opening and closing cylinder 65 is vertically connected to the second template 62. Two locking cylinders 66 parallel to the mold opening and closing cylinder 65 are provided on the third template 63. The two locking cylinders 66 are symmetrically arranged on both sides of the mold opening and closing cylinder 65, and the piston rod of the locking cylinder 66 is vertically connected to the second template 62. Among them, the first template 61 and the second template 62 are used to install the mold 9 for product molding. The second template 62 can be pushed to the left by the mold opening and closing cylinder 65 to realize the clamping of the mold 9 installed on the first template 61 and the second template 62. The second template 62 is pushed synchronously by the two clamping cylinders 66 to realize the locking of the mold 9 on the first template 61 and the second template 62, ensuring that the clamping of the mold 9 has sufficient clamping force, and the two clamping cylinders 66 ensure that the second template 62 is evenly stressed, moves smoothly, and has sufficient clamping force, thereby ensuring the qualified rate of the product.

[0030] In this application, the second template 62 is slidably set on the base frame 1, and a first linear guide rail 67 is provided between the second template 62 and the base frame 1 to ensure smooth movement of the second template 62; the first template 61 and the third template 63 are respectively fixed at the two ends of the guide rail of the first linear guide rail 67, which facilitates the assembly and adjustment of the first template 61 and the third template 63.

[0031] In the present application, a buffer assembly 68 is provided between the second template 62 and the third template 63 to improve the movement stability of the second template 62 and provide a buffering effect. The buffer assembly 68 comprises a first gear 681 and a first rack 682. The first gear 681 is mounted on the base frame 1. Two first racks 682 are provided on the upper and lower sides of the first gear 681 and are both meshed with the first gear 681. One of the two first racks 682 is fixedly connected to the second template 62, and the other of the two first racks 682 is fixedly connected to the third template 63. When the second template 62 moves to the left, it can pull one of the first racks 682 to move to the left synchronously, driving the first gear 681 to rotate counterclockwise. The counterclockwise rotation of the first gear 681 can push the other rack 682 to move to the right. Through the meshing transmission of the two first racks 682 and the first gear 681, the impact of the movement of the second template 62 can be reduced, providing a stabilizing effect and ensuring the smooth opening and closing of the mold opening and closing mechanism 6.

[0032] In the present application, the working process of the blow molding machine is as follows: the extrusion mechanism 4 is actuated, the plastic particles enter the injection barrel 41 through the hopper 43, and are transported to the left by the screw and melted into a plastic melt under the drive of the twisting motor 42, and enter the die head 5 through the nozzle of the injection barrel 41, and are extruded downward under the diversion of the die head 5; at this time, the die head 5 is located above an opening and closing mold mechanism 6 under the action of the swing mechanism 7, such as the latter opening and closing mold mechanism 6, and the plastic melt in the die head 5 enters the latter closed opening and closing mold mechanism 6, and the plastic melt enters the mold 9, and the product is formed by blowing air into the mold 9. The closing action of the opening and closing mold mechanism 6 is to drive the second template 62 to move to the left by the opening and closing mold cylinder 65, so that the mold 9 installed on the first template 61 and the second template 62 are merged together, and then the locking cylinder 66 is actuated to push the second template 62, the mold 9 on the first template 61 and the second template 62 is locked, completing the mold closing action of the mold opening and closing mechanism 6; at this time, the die head 5 moves forward under the action of the swing mechanism 7. Specifically, the swing motor 751 of the swing drive assembly 75 drives the second gear 752 to rotate clockwise, so that the second gear 752 moves forward linearly along the second rack 753, driving the swing motor 751 to move forward synchronously, and then driving the swing frame 71 to swing forward with the rotating table 72 as the center of the circle, moving the die head 5 installed on the swing frame 71 to the previous mold opening and closing mechanism 6 that has been closed, and the die head 5 injects the plastic melt into the previous mold opening and closing mechanism 6; after the injection of the previous mold opening and closing mechanism 6 is completed, the next mold opening and closing mechanism 6 has completed the product cooling and is removed, at this time the swing mechanism 7 swings the die head 5 backward again and moves it above the next mold opening and closing mechanism 6. The swing mechanism 7 continuously swings back and forth to achieve repeated loading, and the products are alternately molded by the two mold opening and closing mechanisms 6, realizing continuous production of products with high production efficiency. If the mold 9 on one of the mold opening and closing mechanisms 6 is damaged and needs to be repaired, the swing mechanism 7 can be stopped and the unrepaired mold opening and closing mechanism 6 can be loaded and produced separately, which can ensure the continuous processing capacity of the blow molding machine and the production volume of the product.

[0033] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0034] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A double-station opening and closing mold blow molding machine, comprising a base frame (1), two opening and closing mold mechanisms (6) arranged side by side on the base frame (1), an upper platform (3) arranged above the base frame (1), an extrusion mechanism (4) arranged on the upper platform (3), and a die head (5) arranged above the opening and closing mold mechanisms (6) connected to the end of the extrusion mechanism (4), characterized in that: The upper platform (3) is provided with a swing mechanism (7), the swing mechanism (7) includes a swing frame (71), the extrusion mechanism (4) and the die head (5) are installed on the swing frame (71), a rotating platform (72) is provided below the end of the swing frame (71) away from the die head (5), the rotating platform (72) is installed on the upper platform (3), a plurality of track wheels (73) are rotatably connected to the swing frame (71), the plurality of track wheels (73) are symmetrically arranged on both sides of the swing frame (71) along the direction from the die head (5) to the rotating platform (72), the upper platform (3) is provided with a plurality of arc tracks (74) matching the track wheels (73), the plurality of arc tracks (74) are all arranged with the rotating platform (72) as the center of the circle, and a swing drive component (75) is provided on one side of the swing frame (71) along the direction from the die head (5) to the rotating platform (72); The swing drive assembly (75) includes a swing motor (751), the swing motor (751) is vertically slidably mounted on the side of the swing frame (71), the lower output shaft end of the swing motor (751) is connected to a second gear (752), the second gear (752) is meshedly connected to a second rack (753), and the second rack (753) is horizontally mounted on the upper platform (3); two second linear guide rails (754) arranged in parallel above and below are provided between the swing motor (751) and the swing frame (71), the guide rails of the second linear guide rails (754) are mounted on the swing frame (71), and the slider of the second linear guide rails (754) is connected to the swing motor (751); the second gear (752) and the second rack (753) are both mounted in the channel steel (755).

2. A double-station opening and closing mold blow molding machine according to claim 1, characterized in that: A plurality of columns (2) are provided at the edge of the base frame (1), and a lifting assembly (8) is provided at the upper end of each of the plurality of columns (2), and the lifting assembly (8) is connected to the upper platform (3).

3. A double-station opening and closing mold blow molding machine according to claim 2, characterized in that: The lifting assembly (8) comprises a lifting motor (81) and a lifting screw (82). The lifting screw (82) is vertically mounted on the column (2). The upper end of the lifting screw (82) is connected to the upper platform (3). A lifting gear box (83) is connected between the lifting screw (82) and the lifting motor (81).

4. A double-station opening and closing mold blow molding machine according to claim 1, characterized in that: The extrusion mechanism (4) includes an injection barrel (41), the injection end of the injection barrel (41) is connected to the die head (5), and the end of the injection barrel (41) away from the die head (5) is provided with a material twisting motor (42) and a hopper (43), and the material twisting motor (42) is connected to a reducer.

5. The double-station opening and closing mold blow molding machine according to claim 1, characterized in that: The mold opening and closing mechanism (6) comprises a first template (61), a second template (62) and a third template (63) which are arranged in parallel in sequence. Two pull rods (64) are connected between the first template (61) and the third template (63). The pull rods (64) move through the second template (62). A mold opening and closing cylinder (65) is installed in the middle of the third template (63). The piston rod end of the mold opening and closing cylinder (65) is vertically connected to the second template (62). Two locking cylinders (66) parallel to the mold opening and closing cylinder (65) are provided on the third template (63). The two locking cylinders (66) are symmetrically arranged on both sides of the mold opening and closing cylinder (65). The piston rod of the locking cylinder (66) is vertically connected to the second template (62).

6. A double-station opening and closing mold blow molding machine according to claim 5, characterized in that: The second template (62) is slidably arranged on the base frame (1), a first linear guide rail (67) is provided between the second template (62) and the base frame (1), and the first template (61) and the third template (63) are respectively fixed to the two ends of the first linear guide rail (67).

7. The double-station opening and closing mold blow molding machine according to claim 5, characterized in that: A buffer assembly (68) is provided between the second template (62) and the third template (63), and the buffer assembly (68) includes a first gear (681) and a first rack (682). The first gear (681) is mounted on the base frame (1), and two first racks (682) are respectively provided on the upper and lower sides of the first gear (681) and are both meshed with the first gear (681). One of the two first racks (682) is fixedly connected to the second template (62), and the other of the two first racks (682) is fixedly connected to the third template (63).

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