A mold closing and pressurizing device for blow molding

Abstract

The utility model relates to a kind of blow molding production with die assembly pressurizing device, characteristics are: front template, middle template and rear template are sequentially arranged in parallel front and back;The lower end of three templates is connected on die assembly device support table by a set of linear guide vice on both sides respectively;Two mold blocks are respectively fixed on the back of front template and the front of middle template;Three templates and two mold blocks constitute mold set;Opening and closing mold quick drive mechanism uses opening and closing mold drive cylinder, it is installed on die assembly device support table, its cylinder rod end is connected with the back of middle template by telescopic component and drive;Synchronous mechanism is the mechanism of the synchronous movement of front template and middle template and the synchronous movement of back-to-back, it is set on the side of mold set;Die assembly pressurizing mechanism uses pressurizing drive cylinder, it is vertically fixed and installed on the back of rear template, the cylinder rod of pressurizing drive cylinder is worn through the reserved hole on rear template, and its cylinder rod front end is fixed with the back of middle template.The device improves production efficiency, and guarantees die membrane pressure.

Description

Technical Field

[0001] This utility model belongs to the technical field of blow molding production equipment, specifically relating to a mold clamping and pressurizing device for blow molding production. Background Technology

[0002] In blow molding production equipment, the mold closing device is a key structure for product molding. It typically consists of two relatively movable mold plates, with mold closing cavities located on opposite sides of the plates. After the two plates close, a complete mold closing cavity is formed inside. The opening and closing of the two mold plates is achieved through a mold opening and closing drive mechanism. Existing mold opening and closing drive mechanisms generally have two structural forms:

[0003] 1. It adopts a single-sided drive mechanism with a synchronous structure;

[0004] 2. It adopts a dual-side drive structure.

[0005] Among them, the single-sided drive mechanism with a synchronous structure can achieve good synchronization and is currently the main type of mold clamping drive mechanism. However, the single-sided drive mechanism with a synchronous structure currently has the following problems in practical use:

[0006] 1. To ensure the production efficiency of blow molding, the two mold plates need to achieve rapid mold closing and opening. The problems with rapid mold opening and closing are: the mold closing speed is too fast and it is easy to cause mold collision, which can easily damage the mold and reduce its service life. In addition, it cannot achieve a large mold closing pressure. For large-capacity blow molded parts (25L and above), if the mold closing pressure is insufficient, the thickness of the connection between the material edge and the body of the molded plastic part will be too large, making subsequent edge trimming more difficult.

[0007] If it is considered that it is easier to remove the edges and reduce the damage to the mold during mold closing, a slow and high-pressure mold closing method can be used, but this will reduce the efficiency of blow molding production. Summary of the Invention

[0008] This invention addresses the shortcomings of existing technologies by proposing a mold closing and pressurizing device for blow molding production that enables rapid mold closing and ensures sufficiently high mold closing pressure.

[0009] The above-mentioned objective of this utility model is achieved through the following technical solution:

[0010] A mold closing and pressurizing device for blow molding production, characterized in that it includes a front mold plate, a middle mold plate, a rear mold plate, a mold opening and closing rapid drive mechanism, a synchronization mechanism, and a mold closing and pressurizing mechanism;

[0011] The front template, middle template, and rear template are arranged in parallel front to back; the lower ends of the front template, the middle template, and the rear template are all connected to the mold closing device support platform via a set of linear guide rails; two mold blocks are fixed on the back of the front template and the front of the middle template, respectively, and semi-mold cavities are arranged opposite each other on the two mold blocks; after the two mold blocks are closed, the two semi-mold cavities form a complete mold cavity; the front template, middle template, rear template, and the two mold blocks constitute a mold assembly;

[0012] The mold opening and closing rapid drive mechanism adopts a mold opening and closing drive cylinder, which is installed on the mold closing device support platform; the cylinder rod end of the mold opening and closing drive cylinder is vertically driven connected to the rear end of the middle template through a telescopic component.

[0013] The synchronization mechanism is a mechanism that drives the front template and the middle template to move synchronously towards each other and synchronously away from each other. It is located on one side of the mold assembly and connects the front template and the middle template.

[0014] The mold clamping and pressurizing mechanism adopts a pressurizing drive cylinder, which is vertically fixedly installed on the back of the rear template. The cylinder rod of the pressurizing drive cylinder passes through the reserved hole on the rear template, and the front end of the cylinder rod is fixedly connected to the back of the middle template.

[0015] Furthermore, it also includes a mold closing and locking mechanism; the mold closing and locking mechanism includes two locking rods, two guide sleeves, a locking drive cylinder, a locking transmission rack and two locking transmission gears; the two locking rods are composed of rod bodies and resistance heads set at the front end of the rod bodies, and the resistance heads are in the shape of elongated flat cylinders; the front part of the two guide sleeves is provided with resistance head guide holes along their axial direction, and the rear part of the two guide sleeves is provided with rod body guide holes along their axial direction, and a bushing is fixed in the rod body guide holes;

[0016] Resistance head guide holes are provided at the upper corner and diagonal position of the front template near the synchronous mechanism; rod through holes are provided at the upper corner and diagonal position of the upper corner near the synchronous mechanism on the middle template and the rear template; the two guide sleeves are fixed to the back of the front template at positions corresponding to the two resistance head guide holes; the two locking rods are inserted and guided by the two guide sleeves; the two locking rods are rotatably and movable relative to the middle template in the front-back direction; the two locking rods are rotatably but limited in the front-back direction in the rear template.

[0017] A locking transmission gear is fixedly installed at the rear end of each of the two locking rods, and the two locking transmission gears mesh with the locking transmission rack on the same side; the locking drive cylinder is fixed to the upper end of the rear template in a direction parallel to the center line connecting the two locking rods, and the cylinder rod end of the locking drive cylinder is drivenly connected to the locking transmission rack.

[0018] Furthermore, the rods on the middle template are fixedly installed with oil-free bearings through the holes, and the front end of the rods on the rear template is coaxially provided with bearing mounting holes, and ball bearings are installed in the bearing mounting holes; the rear parts of the two locking rods pass through the oil-free bearing inner hole, the ball bearing inner hole and the rod through hole on the rear template in sequence.

[0019] Bearing fasteners are fixedly installed on the two locking rods between the back side of the middle template and the front side of the rear template. A pressure bearing is embedded in the bearing hole of the bearing fastener. The pressure bearing is pressed against the outer ring of the ball bearing and the front side of the rear template. A shaft pressure ring and a threaded shaft lock nut are installed on the two locking rods on the back side of the rear template, so that the shaft pressure ring is pressed against the back side of the rear template.

[0020] Furthermore, a rack and pinion guide structure is provided on the back of the rear template, which consists of a guide block at one end and a guide wheel at the other end.

[0021] Furthermore, the synchronization mechanism includes a front rack support, a rear rack support, a first synchronization rack, a second synchronization rack, a synchronization gear, and a gearbox. The front rack support and the rear rack support are fixedly connected to the lower side of the front template and the lower side of the middle template, respectively. Rack mounting holes are provided on the front and rear gear supports, respectively, arranged in the front-to-back direction. The gearbox is located at the middle position between the front rack support and the rear rack support. The synchronization gear is mounted in the gearbox via a synchronization gear shaft. Rack through holes are provided on the gearbox above and below the synchronization gear. The front end of the first synchronization rack is fixedly fitted through the rack mounting hole on the front rack support and passes through the lower rack through hole on the gearbox. The rear end of the second synchronization rack is fixedly fitted through the rack mounting hole on the rear rack support and passes through the upper rack through hole on the gearbox. The first and second synchronization racks mesh with the upper and lower parts of the synchronization gear inside the gearbox.

[0022] Furthermore, an inlet and a return interface are provided on the side of the two mold blocks near the synchronization mechanism. A water distribution block is fixedly installed on the upper end of the gearbox of the synchronization mechanism. A main water inlet and a main water return outlet are provided on the upper end of the water distribution block. A secondary water inlet and a secondary water return outlet are provided on both sides of the water distribution block. The secondary water inlets on both sides are connected to the main water inlet through the water inlet passage inside the water distribution block, and the secondary water return outlets on both sides are connected to the main water return outlet through the water return passage inside the water distribution block. The secondary water inlets and secondary water return outlets on both sides of the water distribution block are connected to the water inlet interface and the water return interface on the corresponding side mold block through the water inlet pipe and the water return pipe, respectively.

[0023] Furthermore, the telescopic assembly consists of a guide sleeve and a thrust head; the inner hole of the guide sleeve is a T-shaped hole with a larger diameter at the front and a smaller diameter at the back, and a groove is provided at the end of the larger front hole, in which a gasket is embedded; the guide sleeve is vertically and fixedly connected to the rear end of the middle template; the thrust head is a T-shaped head, with its large diameter front end slidably fitted into the large front hole of the guide sleeve, and the axial length of the large diameter front end of the thrust head is less than the depth of the large front hole of the guide sleeve; the small diameter rear end of the thrust head is slidably fitted into the small rear hole of the guide sleeve; the rear end of the pusher head is coaxially and fixedly connected to the cylinder rod end of the mold opening and closing drive cylinder.

[0024] The advantages and positive effects of this utility model are as follows:

[0025] 1. The mold opening and closing control of this utility model adopts a combination of a mold opening and closing rapid drive mechanism and a mold closing pressure mechanism. The mold opening and closing near limit positions are achieved by the mold opening and closing rapid drive mechanism, and then the mold closing pressure is achieved by the small stroke and slow movement of the mold closing pressure mechanism. This ensures the production efficiency of the mold opening and closing, and also ensures that a sufficiently large mold closing pressure is achieved, thereby avoiding excessive thickness at the connection between the plastic part edge and the plastic part body.

[0026] This invention simplifies the oil circuit and avoids oil circuit conflicts. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention in the mold-opening state. Figure 1 ;

[0028] Figure 2 This is a schematic diagram of the overall structure of the present invention in the mold-opening state. Figure 2 ;

[0029] Figure 3 This is a schematic diagram of the overall structure of this utility model in the mold-closed state and after the resistance head has rotated;

[0030] Figure 4 This is a schematic diagram of the synchronization mechanism of this utility model;

[0031] Figure 5 This is a cross-sectional view of the mold closing and locking mechanism of this utility model in cooperation with the front template, middle template and rear template;

[0032] Figure 6 This is a structural diagram of the mold closing and locking mechanism of this utility model in the mold opening state;

[0033] Figure 7 This is a structural diagram of the mold closing and locking mechanism of this utility model in the mold closing state;

[0034] Figure 8This is a schematic diagram of the telescopic assembly connecting the mold opening and closing drive cylinder and the middle mold plate of this utility model;

[0035] In the diagram: 1. Front template; 2. Mold block; 3. Middle template; 4. Rear template; 5. Water inlet pipe; 6. Water return pipe; 7. Water distribution block; 8. Gearbox; 9. Guide sleeve; 10. Locking rod; 10.1. Resistance head; 11. Locking transmission gear; 12. Guide wheel; 13. Locking transmission rack; 14. Locking drive cylinder; 15. Pressurizing drive cylinder; 16. Guide block; 17. Mold opening and closing drive cylinder; 18. Front rack support seat; 19. Second synchronous rack; 20. First synchronous rack; 21. Synchronous gear; 22. Rear rack support seat; 23. Bushing; 24. Bearing fixing component; 25. Pressure bearing; 26. Ball bearing; 27. Shaft pressure ring; 28. Shaft lock nut; 29. ​​Gasket; 30. Guide sleeve; 31. Thrust head. Detailed Implementation

[0036] The structure of this utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that these embodiments are descriptive and not limiting.

[0037] Please refer to the following: A mold clamping and pressurizing device for blow molding production. Figure 1 The invention features include a front template 1, a middle template 3, a rear template 4, a rapid mold opening and closing drive mechanism, a synchronization mechanism, a mold closing pressure mechanism, and a mold closing locking mechanism.

[0038] The front template, middle template, and rear template are arranged in parallel front to back. The lower ends of the front template, the middle template, and the rear template are all connected to the mold-closing device support platform via a set of linear guide rails (not shown in the attached drawings). Two mold blocks 2 are fixed to the back of the front template and the front of the middle template, respectively, with semi-mold cavities arranged opposite each other on the two mold blocks. After the two mold blocks are closed, the two semi-mold cavities form a complete mold cavity. The front template, middle template, rear template, and two mold blocks constitute a mold assembly.

[0039] The quick-drive mechanism for opening and closing the mold employs a mold-opening and closing drive cylinder 17. This cylinder is a large-stroke, small-diameter drive cylinder, which can be an electric cylinder, pneumatic cylinder, or hydraulic cylinder; in this invention, an electric cylinder is used. The mold-opening and closing drive cylinder is mounted on the mold-closing device support platform. A clearance groove for the mold-opening and closing drive cylinder is provided at the lower part of the rear template, located between the two linear guide rail pairs. The cylinder rod end of the mold-opening and closing drive cylinder is vertically driven connected to the rear end of the middle template via a telescopic assembly. The telescopic assembly consists of a guide sleeve 30 and a thrust head 31. The inner hole of the guide sleeve is a T-shaped hole, larger at the front and smaller at the rear, with a groove at the end of the larger front hole. A gasket 29, which can be made of polytetrafluoroethylene (PTFE), is embedded in the groove. The guide sleeve is vertically fixedly connected to the rear end of the middle template. The thrust head is T-shaped, with its large-diameter front end slidably fitted into the large front hole of the guide sleeve. The axial length of the large-diameter front end of the thrust head is less than the depth of the large front hole in the guide sleeve, allowing for expansion and contraction between the guide sleeve and the thrust head. The small-diameter rear end of the thrust head slidably fits into the small rear hole of the guide sleeve. The rear end of the pusher head is coaxially and fixedly connected to the cylinder rod end of the mold opening / closing drive cylinder.

[0040] In this invention, the mold opening and closing drive cylinder is a fast-moving cylinder, which can realize fast mold closing and fast mold opening.

[0041] The rapid mold closing process: The cylinder rod of the mold opening and closing drive cylinder pushes the middle mold plate to move towards the center, and the front mold plate also moves towards the center through the synchronization mechanism. When the distance between the two mold plates is between 5mm and 30mm (the distance is determined according to different products), the mold opening and closing drive cylinder stops moving. There is a proximity switch on the cylinder body of the mold opening and closing drive cylinder (the proximity switch can also be arranged in other positions) to sense the mold closing position signal. The rapid mold opening process: The cylinder rod of the mold opening and closing drive cylinder pulls the middle mold plate to move outward, and the front mold plate also moves outward through the synchronization mechanism. There is a proximity switch on the cylinder body of the mold opening and closing drive cylinder to sense the mold opening position signal.

[0042] The synchronization mechanism is used to achieve synchronous opposite-direction movement of the front and middle mold plates during mold closing and synchronous opposite-direction movement during mold opening. The synchronization mechanism employs a rack and pinion transmission mechanism, which is integrally mounted on one side of the mold assembly and includes a front rack support 18, a rear rack support 23, a first synchronous rack 20, a second synchronous rack 19, a synchronous gear 21, and a gearbox 8. The front and rear rack supports are fixedly connected to the lower sides of the front and middle mold plates, respectively. Rack mounting holes are provided on the front and rear gear supports, respectively, arranged in the front-rear direction. The gearbox is located in the middle between the front and rear rack supports. The synchronous gear is mounted in the gearbox via a synchronous gear shaft, specifically, the synchronous gear shaft is rotatably supported on the side wall of the gearbox via bearings. Rack through holes are provided above and below the synchronous gear on the gearbox. The front end of the first synchronizing rack is fixed to the rack mounting hole on the front rack support and passes through the lower rack through hole on the gearbox body. The rear end of the second synchronizing rack is fixed to the rack mounting hole on the rear rack support and passes through the upper rack through hole on the gearbox body. The first and second synchronizing racks mesh with the upper and lower parts of the synchronizing gear inside the gearbox body. Because the second synchronizing rack is located above the first synchronizing rack, the rear rack support adopts a support structure that is higher than the front rack support. To avoid interference between the first synchronizing rack and the rear rack support during mold closing, an avoidance hole (see attached figure) or an avoidance notch can be provided on the lower part of the rear rack support.

[0043] The front end of the first synchronous rack and the rear end of the second synchronous rack are provided with screw sections. The screw sections are fitted into the corresponding rack mounting holes, and locking nuts are installed at the front and rear of the fitting parts to fix the synchronous racks.

[0044] The mold-closing pressurizing mechanism is used to achieve low-speed mold-closing pressurization at the end of the mold-closing process. A pressurizing drive cylinder 15 is used; this cylinder is a short-stroke, large-diameter pressurizing drive cylinder, which can be a pneumatic cylinder, hydraulic cylinder, or electric cylinder. In this invention, the thrust of the pressurizing drive cylinder is 6-10 times the thrust of the rapid mold-closing drive cylinder. The pressurizing drive cylinder is vertically fixedly installed on the back of the rear template, and its cylinder rod passes through a pre-drilled hole on the rear template, with its front end fixedly connected to the back of the middle template.

[0045] The mold closing and locking mechanism is used to lock the mold assembly along the front-to-back direction after the two mold blocks are closed and pressurized. The mold closing and locking mechanism includes two locking rods 10, two guide sleeves 9, a locking drive cylinder 14, a locking transmission rack 13, and two locking transmission gears 11. The locking drive cylinder 14, locking transmission rack 13, and two locking transmission gears are combined to achieve the rotation of the two locking rods, serving as a locking rod rotation drive assembly. The two locking rods consist of rod bodies and resistance heads 10.1 located at the front end of the rod bodies. The resistance heads are elongated cylindrical, formed by milling two flat surfaces opposite each other at the head of the cylindrical body. Flanges are provided at the front ends of the two guide sleeves, and resistance head guide holes 9.1 are provided along their axial direction at the front of the two guide sleeves. The shape of the resistance head guide holes matches the shape of the resistance heads, guiding the resistance heads and restricting their rotation. Rod body guide holes are provided along the axial direction at the rear ends of the two guide sleeves, and bushings 23 are fixed within these guide holes.

[0046] On the front template, at the upper corner and diagonally opposite the location of the synchronizing mechanism, guide holes matching the shape of the locking rod's resistance head are respectively provided. On the middle and rear templates, at the upper corner and diagonally opposite the upper corner of the synchronizing mechanism, rod passage holes are respectively provided. Furthermore, an oil-free bearing is fixed inside the rod passage hole on the middle template, and a bearing mounting hole is coaxially provided at the front end of the rod passage hole on the rear template, with a ball bearing 26 installed inside the bearing mounting hole.

[0047] The two guide sleeves are respectively fixed to the back of the front template at positions corresponding to the guide holes of the two resistance heads by screws. The two locking rods are inserted and guided by the two guide sleeves, that is, the resistance head is guided by the resistance head guide hole on the corresponding guide sleeve with clearance, and the rod body is guided by the bushing in the rod body guide hole on the corresponding guide sleeve with clearance. The two locking rods are rotatable relative to the middle template and movable relative to each other in the front-back direction. The two locking rods are rotatable relative to the rear template but limited in the front-back direction. Specifically, the rear parts of the two locking rods pass through the inner hole of the oilless bearing in the middle template, the inner hole of the ball bearing in the rear template, and the rod through hole on the rear template in sequence. Among them, the rear part of the locking rod is clearance-fitted with the inner hole of the oilless bearing in the middle template, and is interference-fitted with the inner hole of the ball bearing. There is a gap between the rear part of the locking rod and the rod through hole on the rear template.

[0048] To achieve front-to-back positioning of the locking rods and the rear template, bearing fasteners 24 are fixedly installed on the two locking rods between the back of the middle template and the front of the rear template. For ease of installation, the bearing fasteners adopt a two-part connection structure. A pressure bearing 25 is embedded in the bearing hole of the bearing fastener. The pressure bearing is in close contact with the outer ring of the ball bearing and the front of the rear template. A shaft pressure ring 27 and a threaded shaft lock nut 28 are installed on the two locking rods on the back of the rear template, so that the shaft pressure ring is pressed against the back of the rear template, thereby achieving front-to-back positioning of the two locking rods and the rear template.

[0049] A locking transmission gear is fixedly installed at the rear end of each of the two locking rods, and the two locking transmission gears mesh with the locking transmission rack on the same side. The locking drive cylinder is fixed to the upper end of the rear template in a direction parallel to the center line connecting the two locking rods, and the cylinder rod end of the locking drive cylinder is drivenly connected to the locking transmission rack. In addition, a rack guide structure is provided on the back of the rear template to ensure stable meshing of the rack with the two transmission gears. In this utility model, the rack guide structure can adopt, but is not limited to, a structure with a guide block 16 at one end and a guide wheel 12 at the other end.

[0050] In addition to the main technical features mentioned above, to address the cooling issue of the mold blocks, an inlet and a return interface can be provided on the side of the two mold blocks near the synchronization mechanism. A water distribution block 7 is fixedly installed at the upper end of the gearbox of the synchronization mechanism. A main water inlet and a main water return outlet are provided at the upper end of the water distribution block. Sub-inlets and sub-return outlets are provided on both sides of the water distribution block. The sub-inlets on both sides are connected to the main water inlet through the water inlet passage inside the water distribution block, and the sub-return outlets on both sides are connected to the main water return outlet through the water return passage inside the water distribution block. The sub-inlets and sub-return outlets on both sides of the water distribution block are connected to the water inlet and return interfaces on the corresponding mold blocks through water inlet pipes 5 and water return pipes 6, respectively.

[0051] The water-cooling structure of the mold clamping device adopts the above-mentioned arrangement, which has the advantages of reasonable design, convenient pipeline layout, compact overall structure and small space occupation.

[0052] The working principle of this utility model:

[0053] This blow molding production mold closing and pressurizing device goes through three stages during the mold closing action: rapid mold closing, locking rod rotation, slow mold closing and pressurization, and mold closing and locking.

[0054] Rapid mold closing: The cylinder rod of the mold opening and closing drive cylinder extends, causing the thrust head to move forward to contact the rear end of the gasket, pushing the middle mold plate forward. The middle mold plate, through the pressure drive cylinder, synchronously drives the rear mold plate forward. At this time, the relative distance between the middle mold plate and the rear mold plate remains unchanged. Simultaneously, under the action of the synchronization mechanism, the front mold plate moves backward synchronously. When the mold opening and closing drive cylinder has moved the set stroke, rapid mold closing is completed. At this time, the distance between the two mold blocks reaches 5mm-30mm (the spacing is determined according to different products).

[0055] During the rapid mold closing process, the two locking rods and their corresponding guide sleeves move relative to each other. After the rapid mold closing action is completed, the resistance heads at the front ends of the two locking rods extend from the front of the front mold plate and form a gap between the back of the resistance heads and the front of the front mold plate.

[0056] Locking rod rotation: The cylinder rod of the locking drive cylinder extends, driving the locking transmission rack to move. The locking transmission rack drives the two locking transmission gears to rotate 90°, and the two locking transmission gears rotate 90° synchronously.

[0057] Slow mold closing pressure and mold closing locking: The cylinder rod of the pressure drive cylinder extends, pushing the middle template to move towards the center of the mold. The middle template drives the guide sleeve of the telescopic component to move, so that the thrust head moves away from the pad. Due to the action of the synchronization mechanism, the center line positions of the middle template and the front template remain unchanged. The rear template moves backward, and the movement of the rear template pulls the two locking rods to move backward. When the resistance head at the front end of the two locking rods contacts the front of the front template, the mold closing pressure is completed and the mold assembly is locked.

[0058] The mold closing and pressurizing device used in this blow molding production process goes through three stages during the mold opening action: slow mold opening and decompression, mold opening and unlocking, locking rod rotation and reset, and rapid mold opening. This is the opposite of the mold closing action described above.

[0059] Although embodiments and drawings of the present invention have been disclosed for illustrative purposes, those skilled in the art will understand that various substitutions, variations and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A mold clamping and pressurizing device for blow molding production, characterized in that: Includes front template, middle template, rear template, quick mold opening and closing drive mechanism, synchronization mechanism, and mold closing pressure mechanism; The front template, middle template, and rear template are arranged in parallel front to back; the lower ends of the front template, the middle template, and the rear template are all connected to the mold closing device support platform via a set of linear guide rails; two mold blocks are fixed on the back of the front template and the front of the middle template, respectively, and semi-mold cavities are arranged opposite each other on the two mold blocks; after the two mold blocks are closed, the two semi-mold cavities form a complete mold cavity; the front template, middle template, rear template, and the two mold blocks constitute a mold assembly; The mold opening and closing rapid drive mechanism adopts a mold opening and closing drive cylinder, which is installed on the mold closing device support platform; the cylinder rod end of the mold opening and closing drive cylinder is vertically driven connected to the rear end of the middle template through a telescopic component. The synchronization mechanism is a mechanism that drives the front template and the middle template to move synchronously towards each other and synchronously away from each other. It is located on one side of the mold assembly and connects the front template and the middle template. The mold clamping and pressurizing mechanism adopts a pressurizing drive cylinder, which is vertically fixedly installed on the back of the rear template. The cylinder rod of the pressurizing drive cylinder passes through the reserved hole on the rear template, and the front end of the cylinder rod is fixedly connected to the back of the middle template.

2. The mold clamping and pressurizing device for blow molding production according to claim 1, characterized in that: It also includes a mold closing and locking mechanism; the mold closing and locking mechanism includes two locking rods, two guide sleeves, a locking drive cylinder, a locking transmission rack and two locking transmission gears; both locking rods are composed of rod bodies and resistance heads set at the front end of the rod bodies, and the resistance heads are in the shape of elongated flat cylinders; the front part of the two guide sleeves is provided with resistance head guide holes along their axial direction, and the rear part of the two guide sleeves is provided with rod body guide holes along their axial direction, and bushings are fixed in the rod body guide holes; Resistance head guide holes are provided at the upper corner and diagonal position of the front template near the synchronous mechanism; rod through holes are provided at the upper corner and diagonal position of the upper corner near the synchronous mechanism on the middle template and the rear template; the two guide sleeves are fixed to the back of the front template at positions corresponding to the two resistance head guide holes; the two locking rods are inserted and guided by the two guide sleeves; the two locking rods are rotatably and movable relative to the middle template in the front-back direction; the two locking rods are rotatably but limited in the front-back direction in the rear template. A locking transmission gear is fixedly installed at the rear end of each of the two locking rods, and the two locking transmission gears mesh with the locking transmission rack on the same side; the locking drive cylinder is fixed to the upper end of the rear template in a direction parallel to the center line connecting the two locking rods, and the cylinder rod end of the locking drive cylinder is drivenly connected to the locking transmission rack.

3. The mold clamping and pressurizing device for blow molding production according to claim 2, characterized in that: The rods on the middle template are fixedly installed with oil-free bearings in the holes. The rods on the rear template are coaxially provided with bearing mounting holes at the front end of the holes, and ball bearings are installed in the bearing mounting holes. The rear parts of the two locking rods pass through the oil-free bearing inner hole, the ball bearing inner hole and the rod through hole on the rear template in sequence. Bearing fasteners are fixedly installed on the two locking rods between the back side of the middle template and the front side of the rear template. A pressure bearing is embedded in the bearing hole of the bearing fastener. The pressure bearing is pressed against the outer ring of the ball bearing and the front side of the rear template. A shaft pressure ring and a threaded shaft lock nut are installed on the two locking rods on the back side of the rear template, so that the shaft pressure ring is pressed against the back side of the rear template.

4. The mold clamping and pressurizing device for blow molding production according to claim 2, characterized in that: A rack and pinion guide structure is also provided on the back of the rear template. The rack and pinion guide structure consists of a guide block at one end and a guide wheel at the other end.

5. The mold clamping and pressurizing device for blow molding production according to claim 1, characterized in that: The synchronization mechanism includes a front rack support, a rear rack support, a first synchronization rack, a second synchronization rack, a synchronization gear, and a gearbox. The front rack support and the rear rack support are fixedly connected to the lower side of the front template and the lower side of the middle template, respectively. Rack mounting holes are provided on the front and rear gear supports, respectively, arranged in the front-to-back direction. The gearbox is located in the middle between the front and rear rack supports. The synchronization gear is mounted in the gearbox via a synchronization gear shaft. Rack through holes are provided on the gearbox above and below the synchronization gear. The front end of the first synchronization rack is fixedly fitted through the rack mounting hole on the front rack support and passes through the lower rack through hole on the gearbox. The rear end of the second synchronization rack is fixedly fitted through the rack mounting hole on the rear rack support and passes through the upper rack through hole on the gearbox. The first and second synchronization racks mesh with the upper and lower parts of the synchronization gear inside the gearbox.

6. The mold clamping and pressurizing device for blow molding production according to claim 5, characterized in that: An inlet and a return interface are provided on the side of the two mold blocks near the synchronization mechanism. A water distribution block is fixedly installed on the upper end of the gearbox of the synchronization mechanism. A main water inlet and a main water return outlet are provided on the upper end of the water distribution block. A secondary water inlet and a secondary water return outlet are provided on both sides of the water distribution block. The secondary water inlets on both sides are connected to the main water inlet through the water inlet passage inside the water distribution block. The secondary water return outlets on both sides are connected to the main water return outlet through the water return passage inside the water distribution block. The secondary water inlets and secondary water return outlets on both sides of the water distribution block are connected to the water inlet interface and the water return interface on the corresponding side mold block through the water inlet pipe and the water return pipe, respectively.

7. The mold clamping and pressurizing device for blow molding production according to claim 1, characterized in that: The telescopic assembly consists of a guide sleeve and a thrust head. The inner hole of the guide sleeve is a T-shaped hole with a larger diameter at the front and a smaller diameter at the back, and a groove is provided at the end of the larger front hole, in which a gasket is embedded. The guide sleeve is vertically and fixedly connected to the rear end of the middle template. The thrust head is a T-shaped head, with its large diameter front end slidably fitted into the large front hole of the guide sleeve, and the axial length of the large diameter front end of the thrust head is less than the depth of the large front hole of the guide sleeve. The small diameter rear end of the thrust head is slidably fitted into the small rear hole of the guide sleeve. The rear end of the thrust head is coaxially and fixedly connected to the cylinder rod end of the mold opening and closing drive cylinder.

Images