A PET plastic bottle preform injection mold and a use method thereof

Abstract

This invention belongs to the field of plastic bottle processing technology, specifically a PET plastic bottle preform injection mold and its usage method. The PET plastic bottle preform injection mold includes a base, a molding die holder fixed to one side of the top of the base, and a movable plate mounted on the other side of the top of the base. A push plate is provided on one side wall of the movable plate, and multiple evenly distributed double-layer hollow fixing rings are fixed to the outer wall of the push plate. Multiple evenly distributed die heads are fixed to one side wall of the movable plate, and the die heads move through the push plate and fixing rings. A liquid pump is fixedly installed on the top of the movable plate. This invention uses a second electric push rod to move the push plate. After the preform is demolded by the fixing rings, during the return movement, the liquid pump draws out a release agent and introduces it into the cavity of the fixing ring through a conduit. The release agent is then evenly sprayed onto the die head surface through the holes, allowing for release agent application before each injection, which helps avoid damage to the preform during demolding.

Description

Technical Field

[0001] This invention relates to the field of plastic bottle processing technology, specifically to a PET plastic bottle preform injection mold and its usage method. Background Technology

[0002] PET plastic bottles are widely used in beverage packaging, including carbonated drinks, drinking water, juice, enzymes, and tea drinks. They are the most widely used beverage packaging today. PET plastic is also widely used in many other fields such as food, chemical, and pharmaceutical packaging. PET plastic has a wide range of applications in the packaging industry, whether it is packaging film or roll material.

[0003] In the current production and processing of PET plastic bottles, injection molds are used to form the preform. Injection molding machines are the main molding equipment used to create various shapes of plastic products from thermoplastic or thermosetting materials using plastic molds. Injection molding is achieved through the injection molding machine and the mold. Existing injection molds utilize a moving plate to push the preform during actual use, thereby demolding it. However, the mold head is used frequently during injection molding, and existing equipment lacks the ability to automatically spray mold release agent onto the mold head. This easily leads to damage to the preform during demolding, resulting in an increased defect rate. Furthermore, fine particulate impurities remain on the surface of the mold head after demolding, which can affect the results of subsequent injection molding. Therefore, a new technical solution is needed to address this issue. Summary of the Invention

[0004] The purpose of this invention is to provide a PET plastic bottle preform injection mold and its usage method, which solves the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a PET plastic bottle preform injection mold, comprising a base, a molding mold base fixed on one side of the top of the base, a support plate installed on the other side of the top of the base, a first electric push rod fixed on one side wall of the support plate, the push rod of the first electric push rod passing through the support plate and fixedly connected to a movable plate, a pushing plate provided on one side wall of the movable plate, a plurality of evenly distributed double-layer hollow structure fixing rings fixed on the outer wall of the pushing plate, a plurality of evenly distributed mold heads fixed on one side wall of the movable plate, the mold heads movably passing through the pushing plate and the fixing rings, and a second electric push rod fixed on one side wall of the movable plate, the push rod of the second electric push rod passing through the movable plate and fixedly connected to the pushing plate;

[0006] A liquid pump is fixedly installed on the top of the movable plate. One end of the liquid pump is fixedly connected to a liquid supply pipe, and the other end of the liquid pump is fixedly connected to a conduit. An annular groove is formed on the inner wall of the end of the fixed ring near the push plate. Multiple evenly distributed holes are formed on the inner wall of the annular groove. The conduit passes through the push plate and communicates with multiple fixed ring cavities.

[0007] By adopting the above technical solution, the first electric push rod is activated to move the movable plate and the push plate as a whole, so that the die head is inserted into the inner cavity of the forming die base. Then, the raw material is introduced into the inner cavity of the forming die base, thereby forming the blank using the forming die base and the die head. After forming, the first electric push rod is activated to move the movable plate and the push plate back to their original positions. Then, the second electric push rod is activated to move the push plate and the fixed ring along the die head, thereby pushing the formed blank out of the die. After the blank is pushed out of the die, when the second electric push rod moves the push plate and the fixed ring back, the liquid pump is activated to draw the release agent supplied by the liquid supply pipe into the conduit, and then into the cavity of the fixed ring through the conduit. Then, it can be evenly sprayed onto the surface of each die head through the holes, thereby achieving the spraying of release agent onto the die head. This reduces the friction between the blank and the die head during demolding after re-forming, thereby reducing wear and helping to reduce the defect rate of the blank in the later stage, while also improving the efficiency of demolding.

[0008] In a preferred embodiment of the present invention, both sides of the forming mold base are fixed with fixing plates, and both sides of the bottom of the fixing plates are fixedly connected to the top of the base through connecting blocks. The inner side wall of the fixing plate is provided with a sliding groove, the inner cavity of the sliding groove is fixed with a slide rail, the outer wall of the slide rail is fitted with a matching slider, and the outer wall of the slider is fixedly connected to the side wall of the movable plate.

[0009] By adopting the above technical solution, when the first electric actuator drives the movable plate to move, the movable plate can use the slider to slide along the slide rail to limit its movement, thereby ensuring high stability of the movable plate's movement.

[0010] In a preferred embodiment of the present invention, a blower is fixed to one side of the top of the base, a carrier plate is installed on the top plate of the fixing plate, a hollow plate is connected to the top of the carrier plate, a plurality of evenly distributed air outlets are fixedly connected to the inner side wall of the hollow plate, an air duct is fixedly connected to the output end of the blower, and the outer end of the air duct is connected to two of the hollow plates respectively.

[0011] By adopting the above technical solution, the blower can generate airflow to guide the airflow into the cavity of the hollow plate, and then the air outlet can blow the airflow onto the surface of the mold head. This can remove impurities from the surface of the mold after demolding, thus helping to avoid affecting the injection quality during subsequent injection molding.

[0012] In a preferred embodiment of the present invention, a mounting groove is provided at the top center of the carrier plate, and a servo motor is fixedly installed in the inner cavity of the mounting groove. The outer end of the drive shaft of the servo motor is fixedly connected to the bottom center of the hollow plate.

[0013] By adopting the above technical solution, the servo motor can drive the hollow plate to rotate back and forth at small angles to both sides, thereby achieving blowing at different angles, which is beneficial to improving the effect of blowing away impurities. At the same time, when the air is blown through the air outlet on the hollow plate, it can generate a pushing force on the demolded bottle body from the outside, thereby causing the preforms after demolding on both sides to concentrate towards the middle, thus ensuring that they fall accurately into the discharge hole, which helps to prevent the preforms from falling to other places and ensures the accuracy of discharge.

[0014] In a preferred embodiment of the present invention, a feed hole is provided on one side wall of the fixing ring, and the feed hole is connected to the guide tube.

[0015] By adopting the above technical solution, the material can enter the cavity of the fixed ring through the feed hole.

[0016] In a preferred embodiment of the present invention, a discharge hole is provided at the center of the top of the base.

[0017] By adopting the above technical solution, the design of the discharge hole allows the preform to fall directly into the discharge hole after demolding, and then be discharged through the discharge hole.

[0018] In a preferred embodiment of the present invention, a feed pipe is fixedly connected to the top of the molding die base.

[0019] By adopting the above technical solution, the feed pipe is designed to continuously supply injection molding materials into the molding die.

[0020] In a preferred embodiment of the present invention, mounting holes are provided at the four corners of the top of the base.

[0021] By adopting the above technical solution, the installation holes facilitate the installation and fixation of the entire device.

[0022] This invention also relates to a method of using a PET plastic bottle preform injection mold, comprising the following steps:

[0023] S1: First, starting the first electric push rod can drive the movable plate and the push plate to move as a whole, so that the die head is inserted into the inner cavity of the forming die base, and then the raw material is introduced into the inner cavity of the forming die base, thereby using the forming die base and the die head to form the blank;

[0024] S2: After molding, the first electric push rod is activated to drive the movable plate and the push plate to return to their original positions. Then, the second electric push rod is activated to drive the push plate and the fixed ring to move along the mold head, thereby pushing the molded preform out of the mold. When the preform is being unmolded, the air blown through the air nozzle on the hollow plate can generate a pushing force on the demolded bottle body from the outside, thereby causing the preforms after demolding on both sides to concentrate towards the middle, thus ensuring that they fall accurately into the discharge hole. At the same time, the air blown out by the air nozzle blows towards the surface of the mold head, thereby blowing away impurities on the surface after demolding.

[0025] S3: After the blank is pushed out, when the second electric push rod drives the push plate and the fixed ring to move back, the liquid pump is started to draw the release agent provided by the liquid supply pipe into the conduit, and then enters the cavity of the fixed ring through the conduit, and then can be evenly sprayed onto the surface of each mold head through the holes.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] This invention uses a second electric push rod to move a push plate. After the molded preform is pushed out of the mold by a fixing ring, the mold release agent is introduced into the cavity of the fixing ring through a conduit during the return process by a liquid pump. Then, it can be evenly sprayed on the surface of the mold head through the holes. This allows the mold release agent to be sprayed before each injection, thereby achieving efficient demolding and avoiding damage to the preform during demolding, thus helping to reduce the defect rate.

[0028] The blower generates airflow that is directed into the cavity of the hollow plate and then blown onto the mold head surface through the nozzle. This removes impurities from the surface after demolding, thus helping to avoid affecting the injection quality during subsequent injection molding. At the same time, the servo motor drives the hollow plate to rotate back and forth at small angles to both sides, thereby achieving blowing at different angles and improving the effect of removing impurities.

[0029] When air is blown through the air outlet on the hollow plate, it creates a pushing force on the demolded bottle body from the outside, causing the preforms after demolding on both sides to concentrate towards the middle, thus ensuring that they fall accurately into the discharge hole. This helps to prevent the preforms from falling to other places and ensures the accuracy of discharge. Attached Figure Description

[0030] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0031] Figure 1 This is a schematic diagram of the overall structure of a PET plastic bottle preform injection mold and its usage method according to the present invention;

[0032] Figure 2 This is a schematic diagram of the side plate structure of a PET plastic bottle preform injection mold and its usage method according to the present invention;

[0033] Figure 3 This is a schematic diagram of the fixing ring structure of a PET plastic bottle preform injection mold and its usage method according to the present invention;

[0034] Figure 4 This is a schematic diagram of the hollow plate and carrier plate connection structure of a PET plastic bottle preform injection mold and its usage method according to the present invention.

[0035] In the picture:

[0036] 1. Base; 11. Mounting hole; 12. Discharge hole; 13. Molding mold base; 14. Feed pipe;

[0037] 2. Movable plate; 21. Push plate; 22. Fixing ring; 23. Die head; 24. Support plate; 25. First electric actuator; 26. Second electric actuator; 27. Liquid pump; 28. Annular groove; 29. ​​Hole;

[0038] 3. Fixed plate; 31. Slide rail; 32. Slider;

[0039] 4. Blower; 41. Hollow plate; 42. Air outlet; 43. Carrier plate; 44. Servo motor; 45. Air duct. Detailed Implementation

[0040] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0041] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0042] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The model numbers of the electrical appliances provided in this invention are for reference only, and different models of electrical appliances with the same function can be replaced according to actual usage.

[0043] Please see Figure 1-4The present invention provides a technical solution: a PET plastic bottle preform injection mold, including a base 1, a molding mold base 13 fixed on one side of the top of the base 1, a support plate 24 installed on the other side of the top of the base 1, a first electric push rod 25 fixed on one side wall of the support plate 24, the push rod of the first electric push rod 25 passing through the support plate 24 and fixedly connected to a movable plate 2, a push plate 21 provided on one side wall of the movable plate 2, a plurality of evenly distributed double-layer hollow structure fixing rings 22 fixed on the outer wall of the push plate 21, a plurality of evenly distributed mold heads 23 fixed on one side wall of the movable plate 2, the mold heads 23 movably passing through the push plate 21 and the fixing rings 22, a second electric push rod 26 fixed on one side wall of the movable plate 2, the push rod of the second electric push rod 26 passing through the movable plate 2 and fixedly connected to the push plate 21;

[0044] A liquid pump 27 is fixedly installed on the top of the movable plate 2. One end of the liquid pump 27 is fixedly connected to a liquid supply pipe, and the other end of the liquid pump 27 is fixedly connected to a conduit. An annular groove 28 is opened on the inner wall of the end of the fixed ring 22 near the push plate 21. Multiple evenly distributed holes 29 are opened on the inner wall of the annular groove 28. The conduit passes through the push plate 21 and is connected to the cavities of multiple fixed rings 22.

[0045] In actual use, the first electric actuator 25 is activated to move the movable plate 2 and the push plate 21 as a whole, so that the die head 23 is inserted into the inner cavity of the forming die base 13. Then, the raw material is introduced into the inner cavity of the forming die base 13, thereby forming the blank using the forming die base 13 and the die head 23. After forming, the first electric actuator 25 is activated to move the movable plate 2 and the push plate 21 back to their original positions. Then, the second electric actuator 26 is activated to move the push plate 21 and the fixing ring 22 along the die head 23, thereby pushing the formed blank out of the die. After the blank is unloaded, when the second electric push rod 26 drives the push plate 22 and the fixing ring 22 to move back, the liquid pump 27 is started to draw the release agent provided by the liquid supply pipe into the conduit, and then enters the cavity of the fixing ring 22 along the conduit. Then, it can be evenly sprayed onto the surface of each mold head 23 through the holes 29, thereby achieving the spraying of release agent onto the mold head 23. This reduces the friction between the blank and the mold head 23 during demolding after remolding, thereby reducing wear and helping to reduce the defect rate of the blank in the later stage. At the same time, it can also improve the efficiency of demolding.

[0046] Furthermore, mounting holes 11 are provided at the four corners of the top of the base 1. The mounting holes 11 facilitate the installation and fixation of the entire device.

[0047] Furthermore, a discharge hole 12 is provided at the top center of the base 1. The discharge hole 12 is designed so that the blank can fall directly into the discharge hole 12 after demolding and then be discharged through the discharge hole 12.

[0048] It is worth mentioning that the top of the molding die holder 13 is fixedly connected to the feed pipe 14, which enables the continuous supply of injection molding material into the molding die holder 13.

[0049] It should be noted that a feed hole is provided on one side wall of the fixed ring 22. The feed hole is connected to the guide tube, so that the material can enter the cavity of the fixed ring 22 through the feed hole.

[0050] like Figure 1 and 2 As shown; both sides of the molding mold base 13 are fixed with fixing plates 3. The bottom sides of the fixing plates 3 are fixedly connected to the top of the base 1 through connecting blocks. The inner side wall of the fixing plate 3 is provided with a sliding groove. The inner cavity of the sliding groove is fixed with a slide rail 31. The outer wall of the slide rail 31 is fitted with a matching slider 32. The outer wall of the slider 32 is fixedly connected to the side wall of the movable plate 2.

[0051] In actual use, when the first electric actuator 25 drives the movable plate 2 to move, the movable plate 2 can use the slider 32 to slide along the slide rail 31 to limit its movement, thereby ensuring high stability of the movement of the movable plate 2.

[0052] like Figure 1 and 2 As shown in Figure 4; a blower 4 is fixed on one side of the top of the base 1, a carrier plate 43 is installed on the top plate of the fixing plate 3, a hollow plate 41 is connected to the top of the carrier plate 43, a plurality of evenly distributed air outlets 42 are fixedly connected to the inner side wall of the hollow plate 41, and an air duct 45 is fixedly connected to the output end of the blower 4, and the outer end of the air duct 45 is connected to two hollow plates 41 respectively.

[0053] The blower 4 generates airflow which is directed into the cavity of the hollow plate 41 and then blown onto the surface of the mold head 23 by the air outlet 42. This helps to remove impurities from the surface of the mold after demolding, thus avoiding affecting the injection quality during subsequent injection molding.

[0054] Furthermore, a mounting groove is provided at the top center of the carrier plate 43, and a servo motor 44 is fixedly installed in the inner cavity of the mounting groove. The outer end of the drive shaft of the servo motor 44 is fixedly connected to the bottom center of the hollow plate 41.

[0055] The servo motor 44 can drive the hollow plate 41 to rotate back and forth at small angles to both sides, thereby achieving blowing at different angles, which is beneficial to improving the effect of blowing away impurities. At the same time, when the air is blown through the air outlet 42 on the hollow plate 41, it can generate a pushing force on the demolded bottle body from the outside, thereby causing the preforms after demolding on both sides to concentrate towards the middle, thus ensuring that they fall accurately into the discharge hole 12, which helps to prevent the preforms from falling to other places and ensures the accuracy of discharge.

[0056] A method for using a PET plastic bottle preform injection mold, the specific operation is as follows:

[0057] S1: First, starting the first electric push rod 25 can drive the movable plate 2 and the push plate 21 to move as a whole, so that the die head 23 is inserted into the inner cavity of the forming die base 13, and then the raw material is introduced into the inner cavity of the forming die base 13, thereby using the forming die base 13 and the die head 23 to form the blank.

[0058] S2: After molding, the first electric push rod 25 is activated to drive the movable plate 2 and the push plate 21 to move back to their original positions. Then, the second electric push rod 26 is activated to drive the push plate 21 and the fixed ring 22 to move along the mold head 23, thereby pushing the molded blank to be discharged. When discharging, the air blown by the air outlet 42 on the hollow plate 41 can generate a pushing force on the demolded bottle body from the outside, thereby causing the blanks after demolding on both sides to concentrate towards the middle, thus ensuring that they fall accurately into the discharge hole 12. At the same time, the air blown by the air outlet 42 blows towards the surface of the mold head 23, thereby blowing away the impurities on its surface after demolding.

[0059] S3: After the blank is pushed out, when the second electric push rod 26 drives the push plate 22 and the fixing ring 22 to move back, the liquid pump 27 is started to draw the release agent provided by the liquid supply pipe into the conduit, and then enters the cavity of the fixing ring 22 along the conduit, and then can be evenly sprayed onto the surface of each mold head 23 along the hole 29.

[0060] Furthermore, the components included in the PET plastic bottle preform injection mold and its usage method of this invention are all general standard parts or parts known to those skilled in the art. Their structures and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods. In the idle space of this device, all the above-mentioned electrical components, which refer to power components, electrical components, and the matching monitoring computer and power supply, are connected by wires. The specific connection method should refer to the working principle below, and the electrical connection between each electrical component is completed in the order of operation. The detailed connection method is a well-known technology in the art. The following mainly introduces the working principle and process, and will not explain the electrical control.

[0061] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0062] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A PET plastic bottle preform injection mold, comprising a base (1), characterized in that: A molding mold base (13) is fixed on one side of the top of the base (1), and a support plate (24) is installed on the other side of the top of the base (1). A first electric push rod (25) is fixed on one side wall of the support plate (24). The push rod of the first electric push rod (25) passes through the support plate (24) and is fixedly connected to a movable plate (2). A push plate (21) is provided on one side wall of the movable plate (2). A plurality of evenly distributed double-layer hollow structure fixing rings (22) are fixed on the outer wall of the push plate (21). A plurality of evenly distributed mold heads (23) are fixed on one side wall of the movable plate (2). The mold heads (23) move through the push plate (21) and the fixing rings (22). A second electric push rod (26) is fixed on one side wall of the movable plate (2). The push rod of the second electric push rod (26) passes through the movable plate (2) and is fixedly connected to the push plate (21). A liquid pump (27) is fixedly installed on the top of the movable plate (2). One end of the liquid pump (27) is fixedly connected to a liquid supply pipe, and the other end of the liquid pump (27) is fixedly connected to a conduit. An annular groove (28) is opened on the inner wall of the fixed ring (22) near the push plate (21). Multiple evenly distributed holes (29) are opened on the inner wall of the annular groove (28). The conduit passes through the push plate (21) and is connected to the cavities of multiple fixed rings (22).

2. The injection mold for a PET plastic bottle preform according to claim 1, characterized in that: The two side walls of the forming mold base (13) are fixed with fixing plates (3). The bottom two sides of the fixing plates (3) are fixedly connected to the top of the base (1) through connecting blocks. The inner side wall of the fixing plates (3) is provided with a sliding groove. The inner cavity of the sliding groove is fixed with a slide rail (31). The outer wall of the slide rail (31) is fitted with a matching slider (32). The outer wall of the slider (32) is fixedly connected to the side wall of the movable plate (2).

3. The injection mold for a PET plastic bottle preform according to claim 2, characterized in that: A blower (4) is fixed on one side of the top of the base (1). A carrier plate (43) is installed on the top plate of the fixing plate (3). A hollow plate (41) is connected to the top of the carrier plate (43). A plurality of evenly distributed air nozzles (42) are fixedly connected to the inner side wall of the hollow plate (41). A duct (45) is fixedly connected to the output end of the blower (4). The outer end of the duct (45) is connected to two hollow plates (41) respectively.

4. The injection mold for a PET plastic bottle preform according to claim 3, characterized in that: The top center of the carrier plate (43) is provided with an installation groove, and a servo motor (44) is fixedly installed in the inner cavity of the installation groove. The outer end of the drive shaft of the servo motor (44) is fixedly connected to the bottom center of the hollow plate (41).

5. The injection mold for a PET plastic bottle preform according to claim 1, characterized in that: The fixed ring (22) has a feed hole on one side wall, and the feed hole is connected to the guide tube.

6. The injection mold for a PET plastic bottle preform according to claim 1, characterized in that: The base (1) has a discharge hole (12) at the top center.

7. The injection mold for a PET plastic bottle preform according to claim 1, characterized in that: The top of the forming mold base (13) is fixedly connected to the feed pipe (14).

8. The injection mold for a PET plastic bottle preform according to claim 1, characterized in that: Mounting holes (11) are provided at the four corners of the top of the base (1).

9. A method of using a PET plastic preform injection mold, applicable to the PET plastic preform injection mold according to any one of claims 1-8, characterized in that: The methods and steps include the following: S1: First, start the first electric push rod (25) to drive the movable plate (2) and the push plate (21) to move as a whole, so that the die head (23) is inserted into the inner cavity of the forming die base (13), and then the raw material is introduced into the inner cavity of the forming die base (13), thereby using the forming die base (13) and the die head (23) to form the blank; S2: After molding, the first electric push rod (25) is started to drive the movable plate (2) and the push plate (21) to move back and reset. Then the second electric push rod (26) is started to drive the push plate (21) and the fixed ring (22) to move along the mold head (23), thereby pushing the molded blank to be discharged. When the blank is discharged, the air blown by the air nozzle (42) on the hollow plate (41) can generate a pushing force on the demolded bottle body on the outside, thereby causing the blanks after demolding on both sides to concentrate in the middle, thus ensuring that they fall accurately into the discharge hole (12). At the same time, the air blown by the air nozzle (42) is blown towards the surface of the mold head (23), thereby blowing away the impurities on its surface after demolding. S3: After the blank is pushed out, when the second electric push rod (26) drives the push plate (21) and the fixed ring (22) to move back, the liquid pump (27) is started to draw the release agent provided by the liquid supply pipe into the conduit, and then enters the cavity of the fixed ring (22) along the conduit, and then can be evenly sprayed onto the surface of each mold head (23) along the hole (29).

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