Heat preservation cover and mold

By adopting a split structure and mortise and tenon connection in the insulation cover body, combining the sealing ring and sandwich layer, the problem of insufficient physical mechanical properties of the traditional insulation cover is solved, high strength and good sealing are achieved, and overall performance is improved.

CN222241872UActive Publication Date: 2024-12-27HARBIN FRP INST
View PDF 0 Cites 0 Cited by

Patent Information

Application Number
CN202420853256.6
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-04-24
Publication Date
2024-12-27
Estimated Expiration
2034-04-24

AI Technical Summary

Technical Problem

The mechanical properties of the traditional thermal insulation cover are insufficient, the overall stiffness is poor, it is prone to deformation, and the dimensions are unstable, and it is difficult for traditional splicing methods to achieve better structural strength and sealing.

Method used

The insulation cover with split structure is adopted, and the mortise and tenon connection structure of the cover frame and the cover frame is combined with the sealing ring and sandwich layer to improve structural strength and sealing, ensuring good mechanical properties when connecting the split structure and Insulation effect.

Benefits of technology

High strength and good sealing when connecting the split structure of the insulation cover body are achieved, and the problems of insufficient overall stiffness and dimensional instability caused by traditional methods are avoided, and the overall performance of the insulation cover is improved.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN222241872U_ABST
    Figure CN222241872U_ABST
Patent Text Reader

Abstract

The utility model provides a heat preservation cover and a mold, and belongs to the field of heat preservation cover forming. The problem that a traditional cover body is insufficient in mechanical performance is solved. A heat preservation cover comprises an upper cover body and a lower cover body, a first opening is formed in one side of the upper cover body, an opening covering frame is arranged on the end face of the first opening, and the opening covering frame is of a frame structure and comprises a first frame and a second frame which are connected through a first mortise and tenon joint piece; a second opening matched with the first opening is formed in the side, close to the upper cover body, of the cover body, a cover opening frame clamped with the cover opening frame is arranged on the end face of the first opening, the end face of the second opening and the end face of the first opening are connected in a sealed mode through a sealing connecting piece, the cover opening frame comprises a third frame and a fourth frame, and the third frame and the fourth frame are connected through a second mortise and tenon joint piece. And the plurality of connecting catches are distributed at the splicing part of the upper cover body and the cover body and are used for relatively fixing the upper cover body and the cover body. The device is mainly used for heat preservation.
Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] The utility model belongs to the field of heat preservation cover molding, in particular to a heat preservation cover and a mold. Background Art

[0002] Composite insulation covers are often used as protective covers for high-end special equipment. They are windproof, rainproof, dustproof, and have good sealing properties and excellent insulation effects. They are generally composed of inner and outer skins, frames, supports, and sandwich layers. The molding molds for the upper cover and the cover body are designed based on their structure.

[0003] The inner and outer skins provide the complete inner and outer shapes. Its matrix material is generally made of epoxy resin, vinyl ester resin or unsaturated polyester resin that cures at room temperature. The reinforcing material is generally glass fiber or carbon fiber. Carbon fiber is used here. The frame and support parts mainly provide the overall mechanical strength and rigidity of the cover. The sandwich layer is generally made of foam plastic to keep warm, provide a certain rigidity, and reduce the overall weight of the insulation cover.

[0004] The frame of the cover body is particularly important in the overall structure of the cover body because it supports the entire cover body and is related to the bearing capacity of the entire cover body. In the past, the cover body basically relied on the flanges of the inner and outer skins to achieve this bearing capacity. As a result, the overall rigidity was poor, the cover body was easily deformed, and the size was unstable. Although some covers used insulating laminates as the frame, it was difficult to achieve good overall strength and rigidity due to simple splicing. Utility Model Content

[0005] In view of this, the utility model aims to provide a heat preservation cover and a mold to solve the problem of insufficient mechanical properties of the traditional cover.

[0006] To achieve the above object, according to one aspect of the utility model, a heat preservation cover is provided, comprising:

[0007] The upper cover body has a first opening on one side and a cover frame on the end surface of the first opening, wherein the cover frame is a frame structure as a whole and includes a first frame and a second frame, wherein the first frame and the second frame are connected by a first mortise and tenon joint;

[0008] The cover body is provided with a second opening adapted to the first opening on one side close to the upper cover body, a cover frame engaged with the cover frame is provided on the end face of the first opening, the end face of the second opening is sealedly connected to the end face of the first opening through a sealing connector, the cover frame includes a third frame and a fourth frame, and the third frame and the fourth frame are connected through a second mortise and tenon joint.

[0009] Furthermore, the upper cover body also includes a support member, a first inner skin, a first outer skin and a first sandwich layer. The upper cover body as a whole is a sandwich structure, and the sandwich structure is that the first sandwich layer is arranged between the first inner skin and the first outer skin. Multiple support members are arranged at intervals on both side end surfaces of the upper cover body.

[0010] Furthermore, a buckle embedded part is arranged on the first outer skin of the upper cover body.

[0011] Furthermore, the cover body also includes a bottom frame, a second inner skin, a second outer skin and a second sandwich layer. The bottom frame is a sandwich structure as a whole, and the second sandwich layer is wrapped in the middle by the second inner skin and the second outer skin.

[0012] Furthermore, a sealing groove is provided on the second opening end surface of the cover body.

[0013] Furthermore, the sealing connection piece is a sealing ring and is arranged in the sealing groove.

[0014] According to another aspect of the utility model, a mold for producing the cover body as described above is provided, comprising: a cover body female mold and a cover body male mold, wherein the cover body female mold and the cover body male mold together form a molding cavity for molding the cover body.

[0015] According to another aspect of the utility model, a mold for producing the upper cover body as described above is provided, comprising: an upper cover body female mold and an upper cover body male mold, wherein the upper cover body female mold and the upper cover body male mold together form a molding cavity for molding the upper cover body.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] 1. The thermal insulation cover adopts a split structure and the split structure is reliably connected through a connecting buckle lock. It can be separated when needed and relatively fixed during thermal insulation, meeting the requirements of convenience. The thermal insulation performance can be guaranteed by setting the first sandwich layer and the second sandwich layer;

[0018] 2. The heat preservation cover is provided with a cover frame and a lid frame, and a sealing ring structure is provided, which can improve the sealing of the heat preservation cover when the split structure is installed as a whole, thereby ensuring that the heat preservation cover can effectively keep warm;

[0019] 3. The hood frame and the cover frame in the thermal insulation hood both adopt a splicing and mortise and tenon structure to improve the connection performance, thereby improving the structural strength of the hood frame and the cover frame, and avoiding the defects of poor overall rigidity, easy deformation of the hood body, and unstable size caused by the traditional hood body relying on the flanging of the inner and outer skins to achieve this load-bearing capacity, thereby achieving better mechanical properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0021] Figure 1 It is a side view of a heat preservation cover described in the utility model;

[0022] Figure 2 A top view of a heat preservation cover according to the utility model;

[0023] Figure 3 For the utility model Figure 2 AA section view;

[0024] Figure 4 For the utility model Figure 3 A partial enlarged schematic diagram of part I;

[0025] Figure 5 It is a side view of the cover frame of the utility model;

[0026] Figure 6 It is a top view of the cover frame described in the utility model;

[0027] Figure 7 For the utility model Figure 6 BB section view;

[0028] Figure 8 This is a structural diagram of the cover body molding described in the utility model;

[0029] Fig. 9 This is a schematic diagram of the female mold structure of the cover body described in the utility model;

[0030] Fig.10 This is a schematic diagram of the male mold structure of the cover body described in the utility model;

[0031] Fig.11 This is a schematic diagram of the three-dimensional structure of the cover body described in the utility model;

[0032] Fig.12 It is a top view of the upper cover body described in the utility model;

[0033] Fig.13 For the utility model Fig.12 CC direction schematic diagram;

[0034] Fig.14 For the utility model Fig.12 DD direction schematic diagram;

[0035] Fig.15This is a structural diagram of the upper cover body of the utility model;

[0036] Fig.16 This is a schematic diagram of the female mold structure of the upper cover body described in the utility model;

[0037] Fig.17 This is a schematic diagram of the positive mold structure of the upper cover body described in the utility model;

[0038] Fig.18 This is a schematic diagram of the upper cover structure of the utility model;

[0039] Fig.19 It is a three-dimensional structural schematic diagram of the mask frame described in the utility model;

[0040] Fig. 20 It is a cross-sectional view of the cover frame of the utility model;

[0041] Fig.21 For the utility model Fig. 20 A local enlarged schematic diagram of part J of FIG.

[0042] Fig. 22 It is a top view of the cover frame described in the utility model;

[0043] Fig.23 This is a bottom view of the mask frame of the utility model;

[0044] Fig.24 It is a side view of the cover frame of the utility model;

[0045] Fig.25 It is a three-dimensional structural schematic diagram of the cover frame of the utility model;

[0046] Fig.26 It is a cross-sectional view of the cover frame of the utility model;

[0047] Fig. 27 For the utility model Fig.26 A local enlarged schematic diagram of the K part;

[0048] Fig.28 This is a demonstration diagram of the cover frame described in the utility model;

[0049] Fig.29 It is a top view of the cover frame described in the utility model;

[0050] Fig.30 It is a side view of the cover frame of the utility model;

[0051] Fig.31 It is a front view of the first mortise and tenon component and the second mortise and tenon component of the utility model;

[0052] Fig.32 A top view of the first mortise and tenon component and the second mortise and tenon component of the utility model;

[0053] Fig.33 It is a right side view of the first mortise and tenon component and the second mortise and tenon component of the utility model;

[0054] Fig.34 This is a schematic diagram of the matching relationship between the cover frame and the hood frame of the utility model;

[0055] Fig.35 This is the front view of the bottom frame of the utility model;

[0056] Fig.36 For the utility model Fig.35 A cross-sectional view of

[0057] Fig.37 This is a front view of the support member described in the utility model;

[0058] Fig.38 It is a left side view of the support member described in the utility model;

[0059] Fig.39 This is a front view of the buckle lock embedded part of the utility model;

[0060] Fig.40 It is a left side view of the buckle lock embedded part described in the utility model.

[0061] Upper cover body 1; cover opening frame 1-1; first frame 1-1-1; second frame 1-1-2; first mortise and tenon piece 1-1-3; support piece 1-2; buckle embedded part 1-3; first inner skin 1-4; first outer skin 1-5; first sandwich layer 1-6; cover body 2; bottom frame 2-1; cover opening frame 2-2; third frame 2-2-1; fourth frame 2-2-2; second mortise and tenon piece 2-2-3; sealing groove 2-2-4; second inner skin 2-3; second outer skin 2-4; second sandwich layer 2-5; connecting buckle 3; sealing ring 4; cover body female mold 5; cover body male mold 6; clamping bolt 7; upper cover body female mold 8; upper cover body male mold 9. DETAILED DESCRIPTION

[0062] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely explain the technical solutions in the embodiments of the utility model. It should be noted that the embodiments and features in the embodiments of the utility model can be combined with each other without conflict, and the described embodiments are only part of the embodiments of the utility model, not all of the embodiments.

[0063] It should be noted that the descriptions of the present invention regarding directions such as "left", "right", "left side", "right side", "upper", "lower", "top", "bottom", etc. are all defined based on the relationship between the orientations or positions shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the structure described must be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention. In the description of the present invention, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0064] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0065] Referring to the accompanying drawings, this embodiment is described. According to one aspect of the utility model, a heat preservation cover is provided, comprising:

[0066] The upper cover body 1 is provided with a first opening on one side and a cover frame 1-1 is provided on the end surface of the first opening, the cover frame 1-1 is an overall frame structure and includes a first frame 1-1-1 and a second frame 1-1-2, the first frame 1-1-1 and the second frame 1-1-2 are connected by a first mortise and tenon 1-1-3; the upper cover body 1 is supported by the cover frame 1-1, so that the structural mechanical properties can be improved, and the cover frame 1-1 is formed by splicing the first frame 1-1-1 and the second frame 1-1-2, the first frame 1-1-1 and the second frame 1-1-2 are both U-shaped and connected at a certain angle, so as to be spliced ​​into an overall continuous ring, which can be adapted to the opening shape of the upper cover body 1, and at the same time, connected by the mortise and tenon structure, better structural strength can be obtained, and the defects of poor overall rigidity, easy deformation of the cover body, and unstable size when the traditional method of achieving such load-bearing capacity by flanging the inner and outer skins can be avoided.

[0067] The cover body 2 is provided with a second opening adapted to the first opening on one side close to the upper cover body 1, a cover frame 2-2 engaged with the cover frame 1-1 is provided on the end face of the first opening, the end face of the second opening is sealedly connected to the end face of the first opening through a sealing connector, the cover frame 2-2 comprises a third frame 2-2-1 and a fourth frame 2-2-2, the third frame 2-2-1 and the fourth frame 2-2-2 are connected through a second mortise and tenon 2-2-3; similarly, the cover frame 2-2 is also formed by splicing two U-shaped third frames 2-2-1 and fourth frames 2-2-2, and similar second mortise and tenon 2-2-3 are also used for splicing, which can improve the structural strength, and at the same time, the cover frame 2-2 and the cover frame 1-1 can be adapted in shape, and the cover frame 1-1 can be adapted and engaged with the groove provided on the cover frame 2-2, so as to obtain a tighter connection effect, and cooperate with the use of the sealing connector to achieve a good connection and sealing effect.

[0068] The connecting buckle locks 3 are provided in multiple numbers and are distributed at the joint of the upper cover body 1 and the cover body 2 for relative fixation of the upper cover body 1 and the cover body 2. Specifically, one end of the connecting buckle lock 3 is connected to the upper cover body 1 and the other end is connected to the cover body 2, and the two ends are connected by the buckle lock. This structure mainly plays a splicing role, and the existing structure can be used. Any functional component that can reliably connect two separate components can be used in this device.

[0069] In this embodiment, the upper cover body 1 further includes a support member 1-2, a first inner skin 1-4, a first outer skin 1-5 and a first sandwich layer 1-6. The upper cover body 1 is a sandwich structure as a whole. The sandwich structure is that the first sandwich layer 1-6 is arranged between the first inner skin 1-4 and the first outer skin 1-5. Multiple support members 1-2 are arranged at intervals in the end faces of both sides of the upper cover body 1. Multiple support members 1-2 arranged at intervals are arranged inside the upper cover body 1, which can improve the structural strength and play a role in supporting the skeleton. The first sandwich layer 1-6 is foamed by curing the foam stock solution and has thermal insulation performance.

[0070] In this embodiment, a snap lock embedded part 1-3 is provided on the first outer skin 1-5 of the upper cover body 1. The snap lock embedded part 1-3 is provided to form a connection point when connected with the connecting snap lock 3, and one end of the connecting snap lock 3 can be welded to the snap lock embedded part 1-3 or connected with bolts.

[0071] In this embodiment, the cover body 2 also includes a bottom frame 2-1, a second inner skin 2-3, a second outer skin 2-4 and a second sandwich layer 2-5. The bottom frame 2-1 is a sandwich structure as a whole and the second inner skin 2-3 and the second outer skin 2-4 wrap the second sandwich layer 2-5 in the middle.

[0072] In this embodiment, a sealing groove 2-2-4 is provided on the second opening end surface of the cover body 2. The sealing groove 2-2-4 is provided to provide a bonding space for the sealing connector.

[0073] In this embodiment, the sealing connection member is a sealing ring 4 and is arranged in the sealing groove 2-2-4. The sealing ring 4 is easy to obtain and has good sealing performance, which is suitable for the use conditions of the sealing cover. At the same time, for the sealing ring 4, there is no need to adopt a more complex sealing structure, because with the use of the cover frame 1-1 and the cover frame 2-2, a better sealing and heat preservation performance can be obtained.

[0074] According to another aspect of the utility model, a mold for producing the cover body as described above is provided, characterized in that it includes: a cover body female mold 5 and a cover body male mold 6, wherein the cover body female mold 5 and the cover body male mold 6 enclose a molding cavity for molding the cover body 2.

[0075] According to another aspect of the utility model, a method for producing a cover body using the above-mentioned mold is provided, comprising the following steps: the second outer skin 2-4 is formed, the inner surface of the cover body female mold 5 is laid with prepreg with a preset number of layers and ply direction that meet the thickness requirements, and then vacuum cured, the vacuum curing method is to enter a vacuum autoclave for vacuuming and cure according to the curing system of the prepreg matrix material, remove the vacuum assisted molding material after curing, trim according to the contour of the second outer skin 2-4, cut off the excess burrs during the correction process, and then form the second outer skin 2-4, grind the cover mouth frame 2-2 and the second outer skin 2-4 bonding part, the grinding method uses 100 mesh sandpaper to grind the cover mouth frame and the bottom frame bonding part, wipe the bonding surface with cotton yarn dipped in acetone and then bond the cover mouth frame 2-2 and the second outer skin 2-4, and open an injection hole on the outer skin to facilitate the later injection of foam concentrate; the second inner skin 2-3 is formed, and the outer surface of the cover body male mold 6 is laid to meet the thickness requirements The prepreg with the number of layers and the direction of plying is pre-set, and the vacuum-assisted molding material is removed after vacuum curing. The curing method is to put it into a vacuum autoclave for vacuuming and cure it according to the curing system of the prepreg matrix material. The second inner skin 2-3 is trimmed according to the contour and the excess flash is cut off; the cover frame 2-2 and the bottom frame 2-1 are polished with 100 mesh sandpaper, and then the bonding surface is wiped with cotton yarn dipped in acetone and then bonded and cured. The bonding part of the second outer skin 2-4 is coated with enough special adhesive together with The female mold 5 of the cover body is molded and cured together with the male mold 6 of the cover body, and the molds are connected by the mold bolts 7; the special foaming foam stock solution is injected into the cavity between the second inner skin 2-3 and the second outer skin 2-4 through the injection hole of the female mold 5 of the cover body and then cured. The foaming foam stock solution injection process should ensure full filling, and the specific amount can be based on overflow; after the foam stock solution is cured, the second sandwich layer 2-5 is formed and demoulding is carried out; after demoulding, the cover body 2 is trimmed to obtain the cover body 2.

[0076] According to another aspect of the utility model, a mold for producing the upper cover body as described above is provided, comprising: an upper cover body female mold 8 and an upper cover body male mold 9, wherein the upper cover body female mold 8 and the upper cover body male mold 9 enclose a molding cavity for molding the upper cover body 1.

[0077] According to another aspect of the utility model, a method for producing an upper cover body using the above-mentioned mold is provided, comprising the following steps: forming the first outer skin 1-5: the inner surface of the upper cover body female mold 8 is laid with prepregs of pre-set number of layers and ply directions that meet the thickness requirements, and then vacuum curing is performed, the curing method is to enter a vacuum autoclave for vacuuming and cure according to the curing system of the prepreg matrix material, remove the vacuum-assisted molding material after curing, and polish the cover frame 1-1, the support member 1-2 and the buckle embedded member 1-3 with 100 mesh sandpaper after trimming according to the contour of the first outer skin 1-5, wipe the bonding parts with cotton yarn dipped in acetone, and then open a material injection hole on the first outer skin 1-5; forming the first inner skin 1-4: the outer surface of the upper cover body male mold 9 is laid with prepregs of pre-set number of layers and ply directions that meet the thickness requirements, and vacuum curing is performed to remove the vacuum-assisted molding material, and the cover frame 1-1 is polished after trimming according to the contour of the first outer skin 1-5. , the bonding parts of the support members 1-2 and the buckle embedded members 1-3 and wipe the bonding surface; the upper cover body 1 bonding assembly: the cover frame 1-1, the support members 1-2 and the buckle embedded members 1-3 and the first inner skin 1-4 are coated with sufficient special adhesive, and the cover frame 1-1, the support members 1-2 and the buckle embedded members 1-3 are glued to the first inner skin 1-4 after being fixed with a clamp, and then cured, and trimmed after curing; the first outer skin 1-5 bonding parts are coated with sufficient special adhesive together with the upper The cover body female mold 8 is molded together with the upper cover body male mold 9 to adhere the first outer skin 1-5 to the cover frame 1-1, the support part 1-2 and the buckle embedded part 1-3 and then solidify; the first sandwich layer 1-6 is made: the special foaming foam solution is injected into the cavity between the first inner skin 1-4 and the first outer skin 1-5 through the injection hole on the upper cover body female mold 8, and then solidified to form the first sandwich layer 1-6; the upper cover body 1 is demoulded: after demoulding, the injection hole is trimmed to obtain the upper cover body 1.

[0078] The inner skin and the outer skin mentioned in the present application are both made of carbon fiber materials. The first sandwich layer 1-6 and the second sandwich layer 2-5 are foamed with heat-insulating properties.

[0079] The grinding method, wiping method and curing method mentioned in the above description can all be done by existing technologies and will not be described in detail here.

[0080] The embodiments of the utility model disclosed above are only used to help explain the utility model. The embodiments do not describe all the details in detail, nor do they limit the utility model to the specific implementation methods described. According to the content of this specification, many modifications and changes can be made. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model.

Claims

1. A heat preservation cover, characterized in that: include: An upper cover body (1) is provided with a first opening on one side and a cover frame (1-1) is provided on the end surface of the first opening, the cover frame (1-1) is in a frame structure as a whole and comprises a first frame (1-1-1) and a second frame (1-1-2), the first frame (1-1-1) and the second frame (1-1-2) being connected via a first mortise and tenon member (1-1-3); A cover body (2) is provided with a second opening adapted to the first opening on one side close to the upper cover body (1); a cover frame (2-2) engaged with the cover frame (1-1) is provided on the end surface of the first opening; the end surface of the second opening is sealedly connected to the end surface of the first opening via a sealing connector; the cover frame (2-2) comprises a third frame (2-2-1) and a fourth frame (2-2-2); the third frame (2-2-1) and the fourth frame (2-2-2) are connected via a second mortise and tenon joint (2-2-3).

2. A heat preservation cover according to claim 1, characterized in that: The upper cover body (1) further comprises a support member (1-2), a first inner skin (1-4), a first outer skin (1-5) and a first sandwich layer (1-6); the upper cover body (1) as a whole is a sandwich structure, wherein the first sandwich layer (1-6) is arranged between the first inner skin (1-4) and the first outer skin (1-5); and a plurality of support members (1-2) are arranged at intervals on both side end surfaces of the upper cover body (1).

3. A heat preservation cover according to claim 2, characterized in that: A buckle-lock embedded part (1-3) is provided on the first outer skin (1-5) of the upper cover body (1).

4. The heat preservation cover according to claim 1, characterized in that: The cover body (2) further comprises a bottom frame (2-1), a second inner skin (2-3), a second outer skin (2-4) and a second sandwich layer (2-5); the bottom frame (2-1) is a sandwich structure as a whole and the second inner skin (2-3) and the second outer skin (2-4) wrap the second sandwich layer (2-5) in the middle.

5. The heat preservation cover according to claim 1, characterized in that: A sealing groove (2-2-4) is provided on the second opening end surface of the cover body (2).

6. A heat preservation cover according to claim 5, characterized in that: The sealing connection piece is a sealing ring (4) and is arranged in the sealing groove (2-2-4).

7. A mold for producing a cover body as claimed in any one of claims 1 to 6, characterized in that: include: A cover body female mold (5) and a cover body male mold (6), wherein the cover body female mold (5) and the cover body male mold (6) enclose a molding cavity for molding the cover body (2).

8. A mold for producing an upper cover as claimed in any one of claims 1 to 6, characterized in that: include: An upper cover body female mold (8) and an upper cover body male mold (9), wherein the upper cover body female mold (8) and the upper cover body male mold (9) are combined to form a molding cavity for molding the upper cover body (1).