A new heating device for a bottle preform machine

Abstract

This utility model belongs to the field of preform machine technology, specifically a novel preform machine heating device, including a preform machine. A screw extruder is installed on the top right side of the preform machine, an injection molding assembly is installed on the top left side of the preform machine, and a discharge port is provided at the bottom left side of the preform machine. This utility model independently mounts a ceramic heating tube and equips it with a temperature sensor on each injection tube. The temperature of each injection port can be individually monitored and adjusted by a controller. When a certain injection port has poor molding, the controller can control the corresponding ceramic heating tube to reduce the heating power or stop heating, so that the temperature of the injection port drops to a state where the plastic melt cannot flow, thereby realizing the individual closure of the injection port. This can not only accurately solve the problem of poor molding of a single injection port, but also avoid affecting the normal production of other injection ports, fundamentally eliminating the quality risk caused by poor preform bottom molding.

Description

Technical Field

[0001] This utility model relates to the field of bottle preform machine technology, specifically a novel bottle preform machine heating device. Background Technology

[0002] A preform injection molding machine (PET preform injection molding machine) is a specialized piece of equipment used to produce plastic preforms. It melts PET raw material at high temperatures and injects it into a mold to form a semi-finished preform. After subsequent blow molding, the preform can be made into various types of plastic bottles, widely used in the packaging of beverages, food, cosmetics, pharmaceuticals, and other industries. It is a core piece of equipment for achieving efficient and large-scale production of plastic containers, offering advantages such as high precision, high efficiency, and environmental recyclability.

[0003] In the existing field of bottle preform machine technology, the heating device of the bottle preform machine often faces the problem of insufficient temperature control in actual production applications. When the injection port has poor molding, the traditional heating device is difficult to achieve precise temperature adjustment for a single injection port, and it is also impossible to shut down the problematic injection port individually. This makes it difficult to effectively solve the problem of poor preform bottom molding caused by improper injection port temperature control, which in turn generates a large quality risk and affects the quality of bottle preform products and production efficiency. To address this, we propose a new type of bottle preform machine heating device. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a novel preform heating device. Each injection tube is independently fitted with a ceramic heating tube and equipped with a temperature sensor. The temperature of each injection port can be individually monitored and adjusted via a controller, thus solving the problems mentioned earlier.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a novel preform heating device, comprising a preformer, a screw extruder mounted on the top right side of the preformer, an injection molding assembly mounted on the top left side of the preformer, and a discharge port located at the bottom left side of the preformer; the injection molding assembly includes a mounting block and a fixing plate, both fixedly mounted on the top left side of the preformer, and four sets of guide columns fixedly connected between the mounting block and the fixing plate, with sliding supports mounted on the guide columns. The device is equipped with a push-pull plate, and a push-pull device is installed on the mounting block. The output end of the push-pull device is installed on the left side of the push-pull plate. A moving mold base is fixedly installed on the right side of the push-pull plate. Several mold rods are installed on the right side of the moving mold base. A pad is fixedly installed on the left side of the fixing plate. A fixed mold base is fixedly installed on the left side of the pad. A forming plate is fixedly installed on the left side of the fixed mold base. Several mounting cavities are opened through the forming plate. An injection molding mechanism is installed inside each of the mounting cavities. A demolding mechanism is also installed on the right side of the moving mold base.

[0006] Preferably, the injection molding mechanism includes a molding tube disposed inside the mounting cavity. A fixing plate two is fixedly sleeved on the left end of the molding tube and fixedly installed on the left side of the molding plate. An injection molding tube is fixedly connected to the right end of the molding tube. A plurality of injection ports are opened on the left side of the fixed mold base. The input end of the injection port is fixedly connected to the output end of the screw extruder, and the input end of the injection molding tube is fixedly connected to the output end of the injection port. A ceramic heating tube is sleeved on the injection molding tube, and a temperature sensor is installed on the ceramic heating tube.

[0007] Preferably, the demolding mechanism includes a demolding template, which is disposed on the right side of the moving mold base. Two sets of positioning rods are fixedly connected to the upper and lower sides of the right side of the moving mold base. The demolding template is slidably sleeved on the positioning rods, and several of the molding rods are slidably inserted through the demolding template. A hydraulic cylinder is fixedly installed on the left side of the push-pull plate. The output shaft end of the hydraulic cylinder slides out of the right side of the moving mold base, and the output shaft end of the hydraulic cylinder is fixedly connected to the left side of the demolding template. A discharge mechanism is installed on the right side of the demolding template.

[0008] Preferably, the discharge mechanism includes a sliding plate one and a sliding plate two. The sliding plate two is slidably mounted on the sliding plate one. Slider blocks are fixedly connected to the upper and lower sides of the sliding plate one. Slide grooves are provided on the upper and lower right sides of the demolding template. The sliders are slidably connected to the slide grooves. Two sets of guide blocks are fixedly connected to the rear side of the sliding plate one and the front side of the sliding plate two. Two sets of guide plates are fixedly connected to the front and rear sides of the moving mold base. A guide groove is opened on the side of the guide plate near the guide block. A limit rod is fixedly connected to the side of the guide block near the guide groove. The limit rod is slidably connected to the guide groove.

[0009] Preferably, a plurality of semi-fixed blocks 2 are fixedly connected to the right side of the sliding plate 1, and a plurality of semi-fixed blocks 1 are fixedly connected to the right side of the sliding plate 2, with the rod passing through between the semi-fixed blocks 1 and the semi-fixed blocks 2.

[0010] Preferably, sealing strips are fixedly connected to the right sides of both the first and second semi-fixed blocks, and a sealing groove is provided on the left side of the second fixing plate, with the sealing strips inserted into the sealing groove.

[0011] Preferably, a positioning groove is provided through between the fixed mold base and the forming plate, and the positioning rod is slidably inserted into the positioning groove.

[0012] Preferably, semi-threaded grooves are provided on the side of the semi-fixed block one and semi-fixed block two that are close to each other, and the two sets of semi-threaded grooves form a bottle mouth thread forming groove.

[0013] Preferably, the discharge port is located directly below the left side of the forming plate.

[0014] Preferably, a controller is installed at the center of the front side of the preform machine.

[0015] This utility model provides a novel heating device for a preform machine. Compared with the prior art, it has the following advantages:

[0016] 1. This novel preform heating device features an independently installed ceramic heating tube and temperature sensor on each injection tube. The controller allows for individual monitoring and adjustment of the temperature at each injection port. When a poor molding occurs at a particular injection port, the controller can reduce the heating power of the corresponding ceramic heating tube or stop heating, causing the temperature at that injection port to drop to a state where the plastic melt cannot flow. This allows for the individual closure of that injection port, precisely solving the problem of poor molding at a single injection port while avoiding impacting the normal production of other injection ports. This fundamentally eliminates the quality risks caused by poor preform molding. Attached Figure Description

[0017] Figure 1 This is a front view structural diagram of the main body of this utility model;

[0018] Figure 2 This is a top view of the main structure of the present invention;

[0019] Figure 3 This is a schematic diagram of the injection molding component of this utility model.

[0020] Figure 4 This is a schematic diagram of the injection molding mechanism of this utility model;

[0021] Figure 5 This is a schematic diagram of the cross-sectional structure of the molded tube of this utility model;

[0022] Figure 6 This is a schematic diagram of the demolding mechanism of this utility model;

[0023] Figure 7 This is a schematic diagram of the material discharge mechanism of this utility model.

[0024] In the diagram: 1. Preformer; 2. Screw extruder; 3. Controller; 4. Discharge port; 5. Injection molding assembly; 6. Mounting block; 7. Fixing plate 1; 8. Push-pull device; 9. Push-pull plate; 10. Pad plate; 11. Moving mold base; 12. Fixed mold base; 13. Release plate; 14. Molding plate; 15. Guide post; 16. Positioning rod; 17. Positioning groove; 18. Hydraulic cylinder; 19. Molding rod; 20. Injection port; 21. 1. Mounting cavity; 22. Molding tube; 23. Fixing plate two; 24. Ceramic heating tube; 25. Temperature sensor; 26. Sealing groove; 27. Injection tube; 28. Guide plate; 29. ​​Guide block; 30. Guide groove; 31. Sliding groove; 32. Sliding block; 33. Limiting rod; 34. Sliding plate one; 35. Sliding plate two; 36. Semi-fixed block one; 37. Semi-fixed block two; 38. Sealing strip; 39. Semi-threaded groove. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figure 1-7 This utility model provides a technical solution: a new type of preform heating device, including a preform 1, a screw extruder 2 installed on the top right side of the preform 1, an injection molding assembly 5 installed on the top left side of the preform 1, and a discharge port 4 provided on the bottom left side of the preform 1.

[0027] The injection molding assembly 5 includes a mounting block 6 and a fixing plate 7. Both the mounting block 6 and the fixing plate 7 are fixedly installed on the top left side of the preform machine 1. Four sets of guide columns 15 are fixedly connected between the mounting block 6 and the fixing plate 7. A push-pull plate 9 is slidably installed on the guide columns 15. A push-pull device 8 is installed on the mounting block 6. The output end of the push-pull device 8 is installed on the left side of the push-pull plate 9. A moving mold base 11 is fixedly installed on the right side of the push-pull plate 9. Several mold rods 19 are installed on the right side of the moving mold base 11. A pad 10 is fixedly installed on the left side of the fixing plate 7. A fixed mold base 12 is fixedly installed on the left side of the pad 10. A molding plate 14 is fixedly installed on the left side of the fixed mold base 12. Several mounting cavities 21 are opened through the molding plate 14. An injection molding mechanism is installed inside each of the mounting cavities 21. A demolding mechanism is also installed on the right side of the moving mold base 11.

[0028] During operation, the preformer 1 runs, and the screw extruder 2 feeds molten plastic into the injection tube 27 through the injection port 20, and then into the molding tube 22. The push-pull device 8 on the mounting block 6 operates, and its output end pushes the push-pull plate 9 to slide on the guide column 15, which drives the moving mold base 11 and the mold rod 19 to move, and cooperates with the fixed mold base 12 and the molding plate 14 to perform injection molding. After molding, the demolding mechanism is activated, and the demolding mechanism on the right side of the moving mold base 11 pushes the molded preform out of the mold rod 19 and discharges it through the discharge port 4.

[0029] The injection molding mechanism includes a molding tube 22, which is located inside the mounting cavity 21. A fixing plate 23 is fixedly sleeved on the left end of the molding tube 22. The fixing plate 23 is fixedly installed on the left side of the molding plate 14. An injection tube 27 is fixedly connected to the right end of the molding tube 22. Several injection ports 20 are opened on the left side of the fixed mold base 12. The input end of the injection port 20 is fixedly connected to the output end of the screw extruder 2, and the input end of the injection tube 27 is fixedly connected to the output end of the injection port 20. A ceramic heating tube 24 is sleeved on the injection tube 27, and a temperature sensor 25 is installed on the ceramic heating tube 24.

[0030] When the injection molding mechanism is working, the screw extruder 2 feeds molten plastic into the injection tube 27 through the injection port 20. Since the input end of the injection tube 27 is fixedly connected to the output end of the injection port 20, the molten plastic enters the molding tube 22 through the injection tube 27. The molding tube 22 is set in the mounting cavity 21, and its left end is fixedly installed on the left side of the molding plate 14 by the fixing plate 23 to ensure stable position. The ceramic heating tube 24 sleeved on the injection tube 27 heats the molten plastic, and the temperature sensor 25 monitors the temperature in real time to ensure that the molten plastic is in a suitable temperature state during the injection process so that subsequent molding operations can be carried out smoothly in the molding tube 22.

[0031] The demolding mechanism includes a demolding template 13, which is located on the right side of the moving mold base 11. Two sets of positioning rods 16 are fixedly connected to the upper and lower sides of the right side of the moving mold base 11. The demolding template 13 is slidably sleeved on the positioning rods 16, and several rods 19 are slidably inserted through the demolding template 13. A hydraulic cylinder 18 is fixedly installed on the left side of the push-pull plate 9. The output shaft end of the hydraulic cylinder 18 slides out of the right side of the moving mold base 11, and the output shaft end of the hydraulic cylinder 18 is fixedly connected to the left side of the demolding template 13. A discharge mechanism is installed on the right side of the demolding template 13.

[0032] The material discharge mechanism includes a sliding plate 34 and a sliding plate 35. The sliding plate 35 is slidably mounted on the sliding plate 34. Slider 32 is fixedly connected to the upper and lower sides of the sliding plate 34. The upper and lower sides of the right side of the ejector plate 13 are provided with slide grooves 31. The slider 32 is slidably connected to the slide grooves 31. Two sets of guide blocks 29 are fixedly connected to the rear side of the sliding plate 34 and the front side of the sliding plate 35. Two sets of guide plates 28 are fixedly connected to the front and rear sides of the moving mold base 11. A guide groove 30 is opened on the side of the guide plate 28 near the guide block 29. A limit rod 33 is fixedly connected to the side of the guide block 29 near the guide groove 30. The limit rod 33 is slidably connected to the guide groove 30.

[0033] Several semi-fixed blocks 37 are fixedly connected to the right side of sliding plate 34, and several semi-fixed blocks 36 are fixedly connected to the right side of sliding plate 35. The rod 19 passes through the semi-fixed blocks 36 and semi-fixed blocks 37.

[0034] A sealing strip 38 is fixedly connected to the right side of both the semi-fixed block 1 36 and the semi-fixed block 2 37. A sealing groove 26 is opened on the left side of the fixing plate 23, and the sealing strip 38 is inserted into the sealing groove 26.

[0035] A positioning groove 17 is provided through the mold base 12 and the forming plate 14, and the positioning rod 16 is slidably inserted into the positioning groove 17.

[0036] Semi-fixed block 1 36 and semi-fixed block 2 37 are provided with semi-threaded grooves 39 on their adjacent sides, and the two sets of semi-threaded grooves 39 form a bottle mouth thread forming groove.

[0037] When the demolding mechanism is working, the push-pull device 8 pulls the push-pull plate 9, causing the moving mold base 11 and the molding rod 19 to slide to the left on the guide column 15. At the same time, the positioning rod 16 slides to the left in the positioning groove 17 between the fixed mold base 12 and the molding plate 14, and gradually disengages from the positioning groove 17. Then, after the hydraulic cylinder 18 is started, it pushes the demolding plate 13 to slide on the positioning rod 16 through the output shaft. The demolding plate 13 slides in the sliding groove 31 through the slider 32 to limit the sliding of the first sliding plate 34. Since the second sliding plate 35 is slidably installed on the first sliding plate 34, the sliding of the first sliding plate 34 and the second sliding plate 35 is limited. At the same time, the first sliding plate 34... 4 and the guide block 29 on the sliding plate 25 slide in the guide groove 30 of the guide plate 28 through the limiting rod 33, so that the sliding plate 1 34 and the sliding plate 2 35 move away from each other under the guidance of the guide groove 30. When the sliding plate 1 34 and the sliding plate 2 35 move away from each other, the semi-fixed block 1 36 and the semi-fixed block 2 37 separate, and the bottle preform sleeved on the molding rod 19 loses the clamping force. At this time, the bottle mouth thread forming groove formed by the semi-thread groove 39 separates, and the bottle preform falls off the molding rod 19. During the process of the molding rod 19 separating from the forming tube 22, the sealing strip 38 separates from the sealing groove 26 of the fixing plate 23, and finally the formed bottle preform is discharged from the discharge port 4.

[0038] The discharge port 4 is located directly below the left side of the molding plate 14. When the preform is injection molded on the left side of the molding plate 14 and pushed out from the mold rod 19 by the demolding mechanism, it will naturally fall to the discharge port 4 directly below the left side of the molding plate 14 and be discharged out of the preform machine 1 through the discharge port 4, thus realizing the output of the molded preform.

[0039] The preform machine 1 has a controller 3 installed in the middle of the front side. It controls the operation of the push-pull device 8 to drive the push-pull plate 9 to move, controls the hydraulic cylinder 18 to push the demolding plate 13 to slide, and can also receive the temperature signal monitored by the temperature sensor 25 and control the heating state of the ceramic heating tube 24 accordingly, so as to realize the control of the equipment operation process.

[0040] Working principle: When the heating device of this new type of preform machine is in use, the preform machine 1 is running, and the push-pull device 8 on the mounting block 6 is operating. Its output end pushes the push-pull plate 9 to slide on the guide column 15, driving the moving mold base 11 and the molding rod 19 to move until the molding rod 19 is inserted into the forming tube 22, and the positioning rod 16 slides in the positioning groove 17 between the fixed mold base 12 and the forming plate 14 to achieve stable positioning. The sealing strips 38 of the semi-fixed block 1 36 and the semi-fixed block 2 37 are inserted into the sealing groove 26 of the fixed plate 23 to achieve sealing. The semi-fixed block 1 36 and the semi-fixed block 2 37 form the bottle neck thread forming groove to achieve the forming of the bottle neck thread of the preform. Then the screw extruder 2 pushes the molten plastic through the injection port 2. The injection tube 27 is connected to the injection port 20. Molten plastic enters the molding tube 22 through the injection tube 27 and cooperates with the molding rod 19 to form the preform. The molding tube 22 is set in the mounting cavity 21. Its left end is fixedly installed on the left side of the molding plate 14 by the fixing plate 23 to ensure stable position. The ceramic heating tube 24 sleeved on the injection tube 27 heats the molten plastic. The temperature sensor 25 monitors the temperature in real time. The controller 3 receives the temperature signal monitored by the temperature sensor 25 and controls the heating state of the ceramic heating tube 24 accordingly to ensure that the molten plastic is in a suitable temperature state during the injection process so that the preform can be formed smoothly in the molding tube 22.

[0041] After molding, the push-pull device 8 pulls the push-pull plate 9, causing the moving mold base 11 and the molding rod 19 to slide to the left on the guide post 15. At the same time, the positioning rod 16 slides to the left in the positioning groove 17 between the fixed mold base 12 and the molding plate 14, and gradually disengages from the positioning groove 17. Then, after the hydraulic cylinder 18 is started, it pushes the ejector plate 13 to slide on the positioning rod 16 through the output shaft. The ejector plate 13 slides in the slide groove 31 through the slider 32 to limit the sliding of the first sliding plate 34. Since the second sliding plate 35 is slidably installed on the first sliding plate 34, the sliding plate 34 and the second sliding plate 35 are thus limited. The sliding limit of the second sliding plate 35, and the guide blocks 29 on the first sliding plate 34 and the second sliding plate 35 slide in the guide groove 30 of the guide plate 28 through the limit rod 33, so that the first sliding plate 34 and the second sliding plate 35 move away from each other under the guidance of the guide groove 30. When the first sliding plate 34 and the second sliding plate 35 move away from each other, the first semi-fixed block 36 and the second semi-fixed block 37 separate, and the bottle preform sleeved on the molding rod 19 loses the clamping force. At this time, the bottle mouth thread forming groove formed by the semi-thread groove 39 separates, the bottle preform falls off the molding rod 19, and finally the formed bottle preform is discharged from the discharge port 4.

[0042] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0043] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A novel preform heating device, comprising a preform machine (1), characterized in that: A screw extruder (2) is installed on the top right side of the preformer (1), an injection molding assembly (5) is installed on the top left side of the preformer (1), and a discharge port (4) is provided on the bottom left side of the preformer (1). The injection molding assembly (5) includes a mounting block (6) and a fixing plate (7). The mounting block (6) and the fixing plate (7) are both fixedly installed on the top left side of the preform machine (1). Four sets of guide columns (15) are fixedly connected between the mounting block (6) and the fixing plate (7). A push-pull plate (9) is slidably installed on the guide column (15). A push-pull device (8) is installed on the mounting block (6). The output end of the push-pull device (8) is installed on the left side of the push-pull plate (9), and the right side of the push-pull plate (9) is fixed. A moving mold base (11) is installed, and several mold rods (19) are installed on the right side of the moving mold base (11). A pad (10) is fixedly installed on the left side of the fixed plate (7). A fixed mold base (12) is fixedly installed on the left side of the pad (10). A molding plate (14) is fixedly installed on the left side of the fixed mold base (12). Several mounting cavities (21) are opened through the molding plate (14). An injection molding mechanism is installed inside each of the mounting cavities (21). A demolding mechanism is also installed on the right side of the moving mold base (11).

2. The novel preform heating device according to claim 1, characterized in that: The injection molding mechanism includes a molding tube (22), which is located inside the mounting cavity (21). A fixing plate (23) is fixedly sleeved on the left end of the molding tube (22). The fixing plate (23) is fixedly installed on the left side of the molding plate (14). An injection tube (27) is fixedly connected to the right end of the molding tube (22). Several injection ports (20) are opened on the left side of the fixed mold base (12). The input end of the injection port (20) is fixedly connected to the output end of the screw extruder (2), and the input end of the injection tube (27) is fixedly connected to the output end of the injection port (20). A ceramic heating tube (24) is sleeved on the injection tube (27), and a temperature sensor (25) is installed on the ceramic heating tube (24).

3. The novel preform heating device according to claim 2, characterized in that: The demolding mechanism includes a demolding template (13), which is located on the right side of the moving mold base (11). Two sets of positioning rods (16) are fixedly connected to the upper and lower sides of the right side of the moving mold base (11). The demolding template (13) is slidably sleeved on the positioning rods (16), and several of the molding rods (19) are slidably inserted on the demolding template (13). A hydraulic cylinder (18) is fixedly installed on the left side of the push-pull plate (9). The output shaft end of the hydraulic cylinder (18) slides out of the right side of the moving mold base (11), and the output shaft end of the hydraulic cylinder (18) is fixedly connected to the left side of the demolding template (13). A material discharge mechanism is installed on the right side of the demolding template (13).

4. The novel preform heating device according to claim 3, characterized in that: The discharge mechanism includes a sliding plate one (34) and a sliding plate two (35). The sliding plate two (35) is slidably mounted on the sliding plate one (34). The upper and lower sides of the sliding plate one (34) are fixedly connected to sliders (32). The upper and lower sides of the right side of the demolding template (13) are provided with grooves (31). The sliders (32) are slidably connected to the grooves (31). The rear side of the sliding plate one (34) and the front side of the sliding plate two (35) are fixedly connected to two sets of guide blocks (29). The front and rear sides of the moving mold base (11) are fixedly connected to two sets of guide plates (28). The guide plate (28) has a guide groove (30) on the side near the guide block (29). The guide block (29) has a limit rod (33) fixedly connected on the side near the guide groove (30). The limit rod (33) is slidably connected to the guide groove (30).

5. The novel preform heating device according to claim 4, characterized in that: The right side of the sliding plate 1 (34) is fixedly connected to several semi-fixed blocks 2 (37), the right side of the sliding plate 2 (35) is fixedly connected to several semi-fixed blocks 1 (36), and the rod (19) passes between the semi-fixed blocks 1 (36) and the semi-fixed blocks 2 (37).

6. The novel preform heating device according to claim 5, characterized in that: A sealing strip (38) is fixedly connected to the right side of both the first semi-fixed block (36) and the second semi-fixed block (37). A sealing groove (26) is opened on the left side of the second fixing plate (23), and the sealing strip (38) is inserted into the sealing groove (26).

7. The novel preform heating device according to claim 3, characterized in that: A positioning groove (17) is provided between the fixed mold base (12) and the forming plate (14), and the positioning rod (16) is slidably inserted into the positioning groove (17).

8. The novel preform heating device according to claim 5, characterized in that: The semi-fixed block one (36) and the semi-fixed block two (37) are provided with semi-threaded grooves (39) on the side that are close to each other, and the two sets of semi-threaded grooves (39) form a bottle mouth thread forming groove.

9. A novel preform heating device according to claim 1, characterized in that: The discharge port (4) is located directly below the left side of the forming plate (14).

10. A novel preform heating device according to claim 1, characterized in that: A controller (3) is installed on the front middle of the preform machine (1).

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