Fool-proof structure for cavity assembly on cavity plate and bottle blank mold

Abstract

The utility model relates to the technical field of mold parts, provides a mold cavity assembly fool-proof structure for a cavity plate and a bottle blank mold, and aims to solve the problems that a cooling passage of a bottom mold in a mold cavity assembly is easily communicated with a cooling passage of a bottom mold in an adjacent mold cavity assembly due to the fact that an existing mold cavity assembly is not provided with a fool-proof structure; the cooling agent cannot pass through the cooling passage of the cavity, so that the bottle blank manufacturing melt in the cavity cannot be cooled by the cooling agent, and the quality of the bottle blank is influenced. Comprising a cavity used for being arranged in the cavity plate; the flange is arranged on the cavity; and the positioning piece is arranged between the cavity and the flange and is used for determining a first lateral position of the positioning piece relative to the cavity plate.

Description

Technical Field

[0001] The present application relates to the technical field of mold parts, and more specifically, to a fool-proof structure of a cavity component on a cavity plate and a preform mold. Background Art

[0002] The preform mold is generally composed of a core plate, a separation plate and a cavity plate, wherein the core plate and the separation plate serve as a movable mold plate, and the cavity plate serves as a fixed mold plate. The movable mold plate is molded together with the fixed mold plate to form one or more mold cavities. The preform manufacturing melt is injected into the mold cavity through the runner under high pressure. The preform manufacturing melt in the mold cavity is cooled to form a preform, and the preform can be formed into a plastic bottle through subsequent blow molding.

[0003] The mold cavity is generally defined by the space between the cavity assembly, the mouth mold assembly and the core rod assembly. The cavity assembly is used to be arranged on the cavity plate and at least defines the bottle body portion of the external shape of the bottle blank; the mouth mold assembly is used to be arranged on the separation plate and at least defines the neck portion of the external shape of the bottle blank; the core rod assembly is used to be arranged on the core plate and at least defines the internal shape of the bottle blank.

[0004] In order to improve the manufacturing efficiency of preforms, usually as many cavity components as possible are set on a cavity plate, and in order to utilize space, the gaps between cavity components are set as small as possible. Among them, the cavity component usually includes a flange, a cavity and a bottom mold which are precisely connected in sequence. The cavity is set in the cavity plate, the flange is set above the cavity plate, and the bottom mold is set below the cavity plate. In order to make the preform manufacturing melt injected into the mold cavity cool as quickly as possible to form a preform, the cavity and the bottom mold in the cavity component usually have cooling channels, and the cooling channels on the cavity and the bottom mold of the same cavity component are connected. Not only that, the cooling channels between adjacent cavity components are also connected to facilitate the control of the cooling channels.

[0005] It can be foreseen that if the cooling passages of the cavities are connected with the cooling passages of the cavities, and the cooling passages of the bottom molds are connected with the cooling passages of the bottom molds between adjacent cavity assemblies, on a cavity plate, since the cavity is arranged above the bottom mold, that is, the height of the cavity of each cavity assembly relative to the cavity plate will be greater than the height of the bottom mold of the cavity assembly relative to the cavity plate. If the above arrangement is followed, the coolant can only pass through the cooling passage of the bottom mold, but not through the cooling passage of the cavity. Therefore, how to make the cooling passage of the cavity in the cavity assembly connected with the cooling passage of the bottom mold in its adjacent cavity assembly, and prevent the cooling passage of the bottom mold in the cavity assembly from being connected with the cooling passage of the bottom mold in its adjacent cavity assembly, is a problem that needs to be solved in the present application.

[0006] Therefore, the prior art needs to be improved. Utility Model Content

[0007] The purpose of the present application is to provide a fool-proof structure for a cavity assembly on a cavity plate and a preform mold, so as to solve the problem that the existing cavity assembly is not provided with a fool-proof structure, which easily causes the cooling passage of the bottom mold in the cavity assembly to be connected with the cooling passage of the bottom mold in its adjacent cavity assembly, resulting in the coolant being unable to pass through the cooling passage of the cavity, resulting in the bottle preform manufacturing melt in the cavity being unable to be cooled by the coolant and affecting the quality of the bottle preform.

[0008] To achieve the above objectives, the technical solution adopted in the first embodiment of the present application is:

[0009] A cavity assembly foolproof structure for a cavity plate, comprising:

[0010] a cavity, which is used to be arranged in the cavity plate;

[0011] A flange is disposed on the cavity;

[0012] A positioning member is disposed between the cavity and the flange and is used to determine a first lateral position thereof relative to the cavity plate.

[0013] According to the above-mentioned fool-proof structure of the cavity assembly on the cavity plate, a positioning hole matching the positioning member is opened on the cavity, a clearance groove is opened on the flange, the positioning member passes through the clearance groove and is arranged in the positioning hole.

[0014] According to the above-mentioned fool-proof structure of the cavity assembly on the cavity plate, a positioning hole matching the positioning member is provided on the flange, a clearance groove is provided on the cavity, the positioning member passes through the clearance groove and is arranged in the positioning hole.

[0015] According to the above-mentioned cavity assembly fool-proof structure for the cavity plate, at least one first threaded hole and at least one second threaded hole are provided on the flange, the first threaded hole is provided on one side of the flange, and the second threaded hole is provided on the other side of the flange, and the fool-proof structure further includes:

[0016] a first threaded fastener passing through the corresponding first threaded hole and disposed on the cavity plate;

[0017] a second threaded fastener passing through the corresponding second threaded hole and disposed on the cavity plate;

[0018] Wherein, the first threaded hole is different from the second threaded hole, and the first threaded fastener is different from the second threaded fastener.

[0019] According to the above-mentioned foolproof structure for the cavity assembly on the cavity plate, the size of the first threaded hole is different from the size of the second threaded hole, and the size of the first threaded fastener is different from the size of the second threaded fastener.

[0020] According to the above-described foolproof structure for the cavity assembly on the cavity plate, the type of the first threaded hole is different from the type of the second threaded hole, and the type of the first threaded fastener is different from the type of the second threaded fastener.

[0021] According to the above-mentioned cavity assembly fool-proof structure for the cavity plate, the cavity assembly fool-proof structure further includes:

[0022] A bottom mold, which is arranged on an end of the cavity away from the flange, and the bottom mold is provided with at least one fixed positioning groove, and the fixed positioning groove is used to determine its second lateral position relative to the cavity plate;

[0023] The third threaded fastener has an end head and an end tail, wherein the end head part abuts against the fixed positioning groove and the other part is used to abut against the cavity plate, and the end tail is arranged on the cavity plate to fix the bottom mold on the cavity plate.

[0024] According to the above-mentioned cavity assembly fool-proof structure for the cavity plate, the cavity assembly fool-proof structure further includes:

[0025] A sleeve seat, part of which is against the fixed positioning groove and the other part is used to be against the cavity plate. The end of the third threaded fastener is arranged on the sleeve seat, and the end tail passes through the sleeve seat and is arranged on the cavity plate.

[0026] According to the above-mentioned fool-proof structure for the cavity assembly on the cavity plate, each of the bottom molds is provided with two fixed positioning grooves, and two third threaded fasteners are provided.

[0027] The technical solution adopted in the second embodiment of the present application is:

[0028] A bottle blank mold comprises the above-mentioned fool-proof structure for the cavity assembly on the cavity plate.

[0029] The beneficial effects of a cavity assembly foolproof structure and a preform mold provided by the present application are at least:

[0030] It can be foreseen that, on a cavity plate, two positioning members of adjacent cavity assemblies, one for installation on the left side of the cavity plate and the other for installation on the right side of the cavity plate, under this setting, the cooling passage of the cavity of the cavity assembly can be connected with the cooling passage of the bottom mold of its adjacent cavity assembly. That is to say, on the cavity plate, the positioning member can be located at the first lateral position of the cavity plate to intuitively determine the orientation between the cooling passage of the cavity assembly and the cooling passage of the adjacent cavity assembly, thereby ensuring that the cooling passage of the cavity of the cavity assembly is connected with the cooling passage of the bottom mold of its adjacent cavity assembly, thereby achieving an anti-foolproof effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 A schematic diagram of a planar structure in which a fool-proof structure of a cavity assembly on a cavity plate is provided in an embodiment of the present application.

[0033] Figure 2 A schematic diagram of the front three-dimensional structure of a cavity assembly fool-proof structure provided on a cavity plate in an embodiment of the present application.

[0034] Figure 3 for Figure 2 Enlarged view of point A.

[0035] Figure 4 A schematic diagram of the front three-dimensional structure of a cavity assembly fool-proof structure provided in an embodiment of the present application, which is arranged on the cavity plate after the flange is removed.

[0036] Figure 5 for Figure 4 Enlarged view of point B.

[0037] Figure 6 A schematic diagram of the back three-dimensional structure of a cavity assembly fool-proof structure provided on a cavity plate in an embodiment of the present application, wherein the fool-proof structure is arranged on the cavity plate.

[0038] Figure 7 for Figure 6 Enlarged view of point C.

[0039] Figure 8 A schematic diagram of the back three-dimensional structure of a cavity assembly fool-proof structure provided in an embodiment of the present application, which is provided on the cavity plate after removing the third threaded fastener and the socket.

[0040] Fig. 9 for Figure 8 Enlarged view of point D.

[0041] Fig.10 An exploded view of a fool-proof structure for a cavity assembly on a cavity plate provided in an embodiment of the present application.

[0042] Among them, the reference numerals in the figure are:

[0043] 1. Cavity; 11. Positioning hole; 2. Flange; 21. First threaded hole; 22. Second threaded hole; 3. Positioning piece; 41. First threaded fastener; 42. Second threaded fastener; 5. Bottom mold; 51. Fixed positioning groove; 6. Third threaded fastener; 7. Socket seat; 8. Cavity plate. DETAILED DESCRIPTION

[0044] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0045] It should be noted that when a component is referred to as being "fixed on" or "disposed on" another component, it may be directly or indirectly located on the other component. When a component is referred to as being "connected to" another component, it may be directly or indirectly connected to the other component. The directions or positions indicated by the terms "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the directions or positions shown in the accompanying drawings and are only for the convenience of description and cannot be understood as limitations on the present technical solution. The terms "first" and "second" are only used for the convenience of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0046] The preform mold is generally composed of a core plate, a separation plate and a cavity plate, wherein the core plate and the separation plate serve as a movable mold plate, and the cavity plate serves as a fixed mold plate. The movable mold plate is molded together with the fixed mold plate to form one or more mold cavities. The preform manufacturing melt is injected into the mold cavity through the runner under high pressure. The preform manufacturing melt in the mold cavity is cooled to form a preform, and the preform can be formed into a plastic bottle through subsequent blow molding.

[0047] The mold cavity is generally defined by the space between the cavity assembly, the mouth mold assembly and the core rod assembly. The cavity assembly is used to be arranged on the cavity plate and at least defines the bottle body portion of the external shape of the bottle blank; the mouth mold assembly is used to be arranged on the separation plate and at least defines the neck portion of the external shape of the bottle blank; the core rod assembly is used to be arranged on the core plate and at least defines the internal shape of the bottle blank.

[0048] In order to improve the manufacturing efficiency of preforms, usually as many cavity components as possible are set on a cavity plate, and in order to utilize space, the gaps between cavity components are set as small as possible. Among them, the cavity component usually includes a flange, a cavity and a bottom mold which are precisely connected in sequence. The cavity is set in the cavity plate, the flange is set above the cavity plate, and the bottom mold is set below the cavity plate. In order to make the preform manufacturing melt injected into the mold cavity cool as quickly as possible to form a preform, the cavity and the bottom mold in the cavity component usually have cooling channels, and the cooling channels on the cavity and the bottom mold of the same cavity component are connected. Not only that, the cooling channels between adjacent cavity components are also connected to facilitate the control of the cooling channels.

[0049] It can be foreseen that if the cooling passages of the cavities are connected with the cooling passages of the cavities, and the cooling passages of the bottom molds are connected with the cooling passages of the bottom molds between adjacent cavity assemblies, on a cavity plate, since the cavity is arranged above the bottom mold, that is, the height of the cavity of each cavity assembly relative to the cavity plate will be greater than the height of the bottom mold of the cavity assembly relative to the cavity plate. If the above arrangement is followed, the coolant can only pass through the cooling passage of the bottom mold, but not through the cooling passage of the cavity. Therefore, how to make the cooling passage of the cavity in the cavity assembly connected with the cooling passage of the bottom mold in its adjacent cavity assembly, and prevent the cooling passage of the bottom mold in the cavity assembly from being connected with the cooling passage of the bottom mold in its adjacent cavity assembly, is a problem that needs to be solved in the present application.

[0050] See also Figure 1 , Figure 2 , Figure 4 and Figure 5 The first aspect of the embodiment of the present application provides a cavity assembly foolproof structure for a cavity plate, the cavity assembly foolproof structure includes a cavity 1, a flange 2 and a positioning member 3, the cavity 1 is used to be arranged in the cavity plate 8, the flange 2 is arranged on the cavity 1, the positioning member 3 is arranged between the cavity 1 and the flange 2, and is used to determine its first lateral position relative to the cavity plate 8. There are two first lateral positions, one is the left side of the cavity plate 8, and the other is the right side of the cavity plate 8.

[0051] It can be foreseen that on a cavity plate 8, two positioning members 3 of adjacent cavity assemblies, one for installation on the left side of the cavity plate 8 and the other for installation on the right side of the cavity plate 8, under this setting, the cooling passage of the cavity 1 of the cavity assembly can be connected with the cooling passage of the bottom mold 5 of its adjacent cavity assembly. That is to say, on the cavity plate 8, the positioning member 3 can be intuitively located at the first lateral position of the cavity plate 8 to determine the direction between the cooling passage of the cavity assembly and the cooling passage of the adjacent cavity assembly, thereby ensuring that the cooling passage of the cavity 1 of the cavity assembly is connected with the cooling passage of the bottom mold 5 of its adjacent cavity assembly, thereby achieving an anti-foolproof effect.

[0052] Optionally, in one embodiment, the positioning member 3 may be a positioning pin.

[0053] Optional, see Fig.10 In one embodiment, a positioning hole 11 matching the positioning member 3 is formed on the cavity 1, a clearance groove (not shown in the figure) is formed on the flange 2, and the positioning member 3 passes through the clearance groove and is arranged in the positioning hole 11.

[0054] Optionally, in another embodiment, a positioning hole matching the positioning member 3 is formed on the flange 2, a clearance groove is formed on the cavity 1, and the positioning member 3 passes through the clearance groove and is arranged in the positioning hole.

[0055] Optional, see Figure 2 , Figure 3 and Fig.10 In one embodiment, at least one first threaded hole 21 and at least one second threaded hole 22 are provided on the flange 2, the first threaded hole 21 is arranged on one side of the flange 2, and the second threaded hole 22 is arranged on the other side of the flange 2, the fool-proof structure also includes a first threaded fastener 41 and a second threaded fastener 42, the first threaded fastener 41 passes through the corresponding first threaded hole 21 and is arranged on the cavity plate 8, the second threaded fastener 42 passes through the corresponding second threaded hole 22 and is arranged on the cavity plate 8, and this embodiment can fix the flange 2 on the cavity plate 8 by arranging the first threaded fastener 41 and the second threaded fastener 42.

[0056] Since flange 2 is arranged above cavity 1, it covers cavity 1 after installation, in order to further determine the orientation between the cooling passage of the cavity assembly and the cooling passage of the adjacent cavity assembly, it ensures that the cooling passage of cavity 1 of the cavity assembly is connected with the cooling passage of the bottom mold 5 of the adjacent cavity assembly.

[0057] Optionally, in one embodiment, the first threaded hole 21 is different from the second threaded hole 22, and correspondingly, the first threaded fastener 41 is different from the second threaded fastener 42. In this embodiment, the first threaded hole 21 is set to be different from the second threaded hole 22, so that the first threaded fastener 41 can only be installed in the first threaded hole 21 but cannot be installed in the second threaded hole 22, and correspondingly, the second threaded fastener 42 can only be installed in the second threaded hole 22 but cannot be installed in the first threaded hole 21, thereby achieving a foolproof effect.

[0058] Optional, see Fig.10 In one embodiment, two first threaded holes 21 are provided on each of the flanges 2, and two second threaded holes 22 are provided on each of the flanges 2. Accordingly, two first threaded fasteners 41 and two second threaded fasteners 42 are provided.

[0059] Optionally, in an embodiment, the size of the first threaded hole 21 is different from the size of the second threaded hole 22 , and accordingly, the size of the first threaded fastener 41 is different from the size of the second threaded fastener 42 .

[0060] Optionally, in another embodiment, the type of the first threaded hole 21 is different from the type of the second threaded hole 22 , and correspondingly, the type of the first threaded fastener 41 is different from the type of the second threaded fastener 42 .

[0061] Optional, see Figure 6 , Figure 7 , Figure 8 and Fig. 9 In one embodiment, the cavity assembly fool-proof structure further includes a bottom mold 5 and a third threaded fastener 6, the bottom mold 5 is arranged on the end of the cavity 1 away from the flange 2, the bottom mold 5 is provided with at least one fixed positioning groove 51, the fixed positioning groove 51 is used to determine its second lateral position relative to the cavity plate 8, the third threaded fastener 6 has an end and an end tail, the end head part is abutted against the fixed positioning groove 51, and the other part is used to abut against the cavity plate 8, and the end tail is arranged on the cavity plate 8 to fix the bottom mold 5 on the cavity plate 8.

[0062] There are two second lateral positions, one is the left side of the cavity plate 8, and the other is the right side of the cavity plate 8, see Figure 6 and Figure 7There are two third threaded fasteners 6 of adjacent cavity assemblies on a cavity plate 8, one for installation on the left side of the cavity plate 8, and the other for installation on the right side of the cavity plate 8. When the third threaded fastener 6 needs to be installed on the left side of the cavity plate 8, a mounting hole will be opened at the left side position of the cavity plate 8, while no mounting hole will be opened at the right side position of the cavity plate 8 corresponding to the third threaded fastener 6, so that the third threaded fastener 6 can be uniquely determined and fixed in the corresponding mounting hole. Accordingly, when the third threaded fastener 6 needs to be installed on the right side of the cavity plate 8, a mounting hole will be opened at the right side position of the cavity plate 8, while no mounting hole will be opened at the left side position of the cavity plate 8 corresponding to the third threaded fastener 6.

[0063] That is to say, the third threaded fasteners 6 on different bottom molds 5 may be installed in different lateral directions (either the left side or the right side). In this embodiment, the orientation of the bottom mold 5 relative to the cavity plate 8 can be determined by whether the third threaded fastener 6 can be installed on the cavity plate 8. It can be foreseen that the third threaded fastener 6 can also play an anti-foolproof effect.

[0064] Optional, see Figure 6 , Figure 7 and Fig.10 In one embodiment, the cavity assembly anti-fool structure also includes a socket 7, a portion of the socket 7 is abutted against the fixed positioning groove 51, and the other portion is used to abut against the cavity plate 8, the end of the third threaded fastener 6 is arranged on the socket 7, and the end tail passes through the socket 7 and is arranged on the cavity plate 8.

[0065] In this embodiment, the sleeve seat 7 is provided. Compared with directly abutting the end of the third threaded fastener 6 against the fixed positioning groove 51 and the cavity plate 8, the provision of the sleeve seat 7 can make the contact area between the third threaded fastener 6 and the fixed positioning groove 51 and the cavity plate 8 larger, thereby making the connection structure of the third threaded fastener 6 used to connect the bottom mold 5 and the cavity plate 8 more stable.

[0066] Optional, see Fig.10 In one embodiment, two fixing positioning grooves 51 are provided on each of the bottom molds 5 , and correspondingly, two third threaded fasteners 6 are provided.

[0067] A second aspect of an embodiment of the present application provides a preform mold, comprising the above-mentioned fool-proof structure for the cavity assembly on the cavity plate.

[0068] In summary, the present application provides a foolproof structure of a cavity assembly on a cavity plate and a preform mold, comprising a cavity 1, a flange 2 and a positioning member 3, wherein the cavity 1 is used to be arranged in the cavity plate 8, the flange 2 is arranged on the cavity 1, and the positioning member 3 is arranged between the cavity 1 and the flange 2, and is used to determine its first lateral position relative to the cavity plate 8. There are two types of first lateral positions, one is the left side of the cavity plate 8, and the other is the right side of the cavity plate 8. It can be foreseen that on a cavity plate 8, two positioning members 3 of adjacent cavity assemblies, one for installation on the left side of the cavity plate 8 and the other for installation on the right side of the cavity plate 8, under this setting, the cooling passage of the cavity 1 of the cavity assembly can be connected with the cooling passage of the bottom mold 5 of its adjacent cavity assembly. That is to say, on the cavity plate 8, the positioning member 3 can be intuitively located at the first lateral position of the cavity plate 8 to determine the direction between the cooling passage of the cavity assembly and the cooling passage of the adjacent cavity assembly, thereby ensuring that the cooling passage of the cavity 1 of the cavity assembly is connected with the cooling passage of the bottom mold 5 of its adjacent cavity assembly, thereby achieving an anti-foolproof effect.

[0069] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A cavity assembly foolproof structure for a cavity plate, characterized in that: include: a cavity, which is used to be arranged in the cavity plate; A flange is disposed on the cavity; A positioning member is disposed between the cavity and the flange and is used to determine a first lateral position thereof relative to the cavity plate.

2. The foolproof structure of the cavity assembly used on the cavity plate according to claim 1, characterized in that: The cavity is provided with a positioning hole matching the positioning member, the flange is provided with a clearance groove, the positioning member passes through the clearance groove and is arranged in the positioning hole.

3. The foolproof structure of the cavity assembly used on the cavity plate according to claim 1, characterized in that: The flange is provided with a positioning hole matching the positioning member, the cavity is provided with a clearance groove, the positioning member passes through the clearance groove and is arranged in the positioning hole.

4. The foolproof structure of the cavity assembly used on the cavity plate according to claim 1, characterized in that: The flange is provided with at least one first threaded hole and at least one second threaded hole, wherein the first threaded hole is provided on one side of the flange, and the second threaded hole is provided on the other side of the flange, and the foolproof structure further comprises: a first threaded fastener passing through the corresponding first threaded hole and disposed on the cavity plate; a second threaded fastener passing through the corresponding second threaded hole and disposed on the cavity plate; Wherein, the first threaded hole is different from the second threaded hole, and the first threaded fastener is different from the second threaded fastener.

5. The foolproof structure of the cavity assembly used on the cavity plate according to claim 4, characterized in that: The size of the first threaded hole is different from the size of the second threaded hole, and the size of the first threaded fastener is different from the size of the second threaded fastener.

6. The foolproof structure of the cavity assembly used on the cavity plate according to claim 4, characterized in that: The type of the first threaded hole is different from the type of the second threaded hole, and the type of the first threaded fastener is different from the type of the second threaded fastener.

7. The foolproof structure of the cavity assembly used on the cavity plate according to claim 1, characterized in that: The cavity component fool-proof structure also includes: A bottom mold, which is arranged on an end of the cavity away from the flange, and the bottom mold is provided with at least one fixed positioning groove, and the fixed positioning groove is used to determine its second lateral position relative to the cavity plate; The third threaded fastener has an end head and an end tail, wherein the end head part abuts against the fixed positioning groove and the other part is used to abut against the cavity plate, and the end tail is arranged on the cavity plate to fix the bottom mold on the cavity plate.

8. The foolproof structure of the cavity assembly used on the cavity plate according to claim 7, characterized in that: The cavity component fool-proof structure also includes: A sleeve seat, part of which is against the fixed positioning groove and the other part is used to be against the cavity plate. The end of the third threaded fastener is arranged on the sleeve seat, and the end tail passes through the sleeve seat and is arranged on the cavity plate.

9. The foolproof structure of the cavity assembly used on the cavity plate according to claim 8, characterized in that: Each of the bottom molds has two fixed positioning grooves, and each of the bottom molds has two third threaded fasteners.

10. A preform mold, characterized in that: It comprises a fool-proof structure for a cavity assembly on a cavity plate as described in any one of claims 1 to 9.

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