Coil pipe centrifugal fan blade structure and forming equipment

Abstract

The utility model relates to the field of coil pipe centrifugal fan blade production, in particular to a coil pipe centrifugal fan blade structure and forming equipment, the coil pipe centrifugal fan blade structure comprises a shaft disc and a first annular fan blade assembly, the shaft disc is provided with a shaft hole and a shaft sleeve, the shaft sleeve is aligned and communicated with the shaft hole, and the shaft sleeve is provided with a limiting piece; the first annular fan blade assembly is connected with the shaft disc, the first annular fan blade assembly and the shaft sleeve are located on the same side of the shaft disc, the shaft sleeve is located in the first annular fan blade assembly, the first annular fan blade assembly is provided with a channel opposite to the limiting piece, and an arch-shaped piece connected with the first annular fan blade assembly is arranged in the channel; the arched piece reinforces the channel, improves the blade strength and prevents the blade from being cracked during injection molding; the forming equipment is provided with a forming structure and an ejector pin, an arch-shaped piece and a channel are formed during injection molding of the forming structure, and the ejector pin conveniently abuts against the arch-shaped piece for demolding.

Description

Technical Field

[0001] The utility model relates to the field of production of coil centrifugal air blades, and particularly relates to a coil centrifugal air blade structure and a forming device thereof. Background Art

[0002] The existing circular screw hole design of the coil centrifugal air blade structure is to open holes on the blade. During injection molding, a circular forming structure forms a through hole at a specified position on the blade. The bolt is aligned through the through hole, so that the tool can extend into the through hole to rotate the bolt, and the coil centrifugal air blade structure is fixed on the rotating shaft by tightening the bolt.

[0003] However, the method of forming a through hole on the blade reduces the local strength of the open blade. After forming, due to the forming structure occupying the position of the ejector pin, the coil centrifugal air blade structure cannot be uniformly stressed during demolding, making demolding difficult. Moreover, the cylindrical forming structure is prone to cause the blade to crack during the forming of the through hole, resulting in difficult production of the coil centrifugal air blade structure and waste of raw materials. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the deficiencies in the prior art that the coil centrifugal air blade structure is difficult to demold and the blade is prone to cracking during forming, and to provide a coil centrifugal air blade structure and a forming device thereof.

[0005] In a first aspect, the utility model provides a coil centrifugal air blade structure, including

[0006] A shaft disc, the shaft disc is provided with a shaft hole and a shaft sleeve, the shaft sleeve is aligned and communicated with the shaft hole, and the shaft sleeve is provided with a limiting member for limiting and fixing the rotating shaft;

[0007] A first annular air blade assembly, the first annular air blade assembly is connected to the shaft disc, the first annular air blade assembly and the shaft sleeve are located on the same side of the shaft disc, the shaft sleeve is located inside the first annular air blade assembly, the first annular air blade assembly is provided with a channel, the channel is disposed opposite to the limiting member, and an arch member is disposed in the channel, and the arch member is connected to the first annular air blade assembly.

[0008] For a coil centrifugal air blade structure of the utility model, the rotating shaft passes through the shaft sleeve and the shaft hole, and the shaft disc is fixed on the rotating shaft by the limiting member abutting against the rotating shaft; a channel is opened on the first annular air blade, and the tool operates on the limiting member through the channel to fix the shaft disc and the rotating shaft; an arch member is disposed in the channel to reinforce the channel, so that the blade strength of the first annular air blade assembly is higher, avoiding blade cracking during the forming of the first annular air blade assembly, thereby improving the injection molding yield rate of the coil centrifugal air blade structure and improving the injection molding production efficiency of the coil centrifugal air blade structure.

[0009] The middle part of the bushing has a rotating shaft channel opened, and the rotating shaft channel is aligned and communicated with the shaft hole.

[0010] Preferably, a second annular blade assembly, the second annular blade assembly is connected to the shaft disc, and the first annular blade assembly and the second annular blade assembly are respectively located on both sides of the shaft disc; the shaft hole penetrates through the middle of the shaft disc, and the first annular blade assembly and the second annular blade assembly are both coaxially arranged with the shaft disc.

[0011] A first annular blade and a second annular blade are respectively arranged on opposite sides of the shaft disc. When the rotating shaft drives the shaft disc to rotate, the shaft disc can make the first annular blade and the second annular blade rotate, so as to make the coil centrifugal blade structure generate air flow. When the rotating shaft rotates, it can drive the first annular blade and the second annular blade to rotate around the axis of the shaft disc, so as to ensure the dynamic balance of the coil centrifugal blade structure.

[0012] Preferably, the first annular blade assembly includes a first hoop and a plurality of first blades. The plurality of first blades are arranged in a ring centered on the axis of the shaft disc, and adjacent first blades have intervals. The first blades are connected to the shaft disc, the first hoop is connected to the first blades, and the arch-shaped member is connected to the first blades; the second annular blade assembly includes a second hoop and a plurality of second blades. The plurality of second blades are arranged in a ring centered on the axis of the shaft disc, and adjacent second blades have intervals. The second blades are connected to the shaft disc, and the second hoop is connected to the second blades.

[0013] Reinforced by the first hoop, the first blades are not easily deformed during rotation. Reinforced by the second hoop, the second blades are not easily deformed during rotation.

[0014] Preferably, both the first hoop and the second hoop are annular structural members. A plurality of the first blades are arranged in a ring on the inner ring side of the first hoop, and a plurality of the second blades are arranged in a ring on the inner ring side of the second hoop.

[0015] Each first blade is connected to the first hoop to prevent the first blade from deforming; each second blade is connected to the second hoop to prevent the second blade from deforming.

[0016] Preferably, the arch-shaped member is a U-shaped through groove. The end of the arch-shaped member is connected to the shaft disc to form the channel, and the top of the arch-shaped member is connected to the first blade.

[0017] The U-shaped through groove is buckled on the shaft disc to form a channel, so that the end of the U-shaped through groove is connected to the shaft disc, and a blade is connected to the top of the U-shaped through groove, thereby ensuring the structural strength of the first blade connected to the arch-shaped member.

[0018] Preferably, a plurality of the first blades are arranged at the edge of the shaft disc, and a plurality of the second blades are arranged at the edge of the shaft disc.

[0019] By connecting the blades to the edge of the shaft disc, more blades can be arranged on the shaft disc, ensuring the gas flow efficiency.

[0020] Preferably, the shaft sleeve includes a frustum-shaped member and a sleeve. The frustum-shaped member is provided with a through hole adapted to the shaft hole, the through hole is aligned and communicated with the shaft hole, the frustum-shaped member is connected to the shaft disc, the sleeve is aligned and communicated with the through hole, the sleeve is connected to the frustum-shaped member, and the limiting member is connected to the sleeve.

[0021] The frustum-shaped member increases the contact area with the shaft disc, making the connection between the shaft disc and the shaft sleeve firm. The rotating shaft sequentially passes through the through hole of the sleeve and the shaft hole, so that the shaft disc is fixed on the rotating shaft; by the limiting member abutting against the rotating shaft, the shaft sleeve is firmly fixed to the rotating shaft; the cylindrical channel in the middle of the sleeve is aligned and communicated with the through hole, thus forming a rotating shaft channel.

[0022] Preferably, the sleeve is provided with a through limiting hole in the radial direction, and the limiting member includes a limiting bolt, and the limiting bolt is threadedly connected with the limiting hole.

[0023] The limiting hole penetrates the side wall of the sleeve along the radial direction of the sleeve. A limiting member is inserted into the limiting hole. By rotating the limiting member, the end of the limiting member can abut against the rotating shaft, realizing the limiting and fixing between the shaft sleeve and the shaft disc.

[0024] Preferably, the shaft disc, the first annular wind blade assembly and the arched member are integrally formed structural members.

[0025] Ensure the structural strength of the coiled pipe centrifugal wind blade structure.

[0026] In a second aspect, the present invention provides a forming device for a coiled pipe centrifugal wind blade structure. The forming device is used for the above-mentioned coiled pipe centrifugal wind blade structure, and includes a device body. The device body is provided with a forming structure for forming the arched member, and the forming structure is slidably connected with the device body; the device body is provided with a thimble for demolding, the thimble is slidably connected with the device body, and the thimble can abut against the arched member.

[0027] The forming device for the coiled pipe centrifugal wind blade structure of the present invention strengthens the blade strength by designing an arched member reinforcement channel and reduces the positioning difficulty; during demolding, the thimble can abut against the arched member to easily eject the blade, reducing the scratching and deformation of the blade, reducing the production difficulty of the coiled pipe centrifugal wind blade structure, and reducing the economic loss caused by blade damage.

[0028] Compared with the prior art, the beneficial effects of the present invention:

[0029] 1. A coiled centrifugal fan blade structure of the present utility model, where a rotating shaft passes through a shaft sleeve and a shaft hole, and a shaft disc is fixed on the rotating shaft by a limiting member abutting against the rotating shaft; a channel is formed on the first annular fan blade, and a tool operates on the limiting member through the channel to fix the shaft disc to the rotating shaft; an arch-shaped member is arranged in the channel to reinforce the channel through the arch-shaped member, making the blade strength of the first annular fan blade assembly higher, avoiding blade cracking during the forming of the first annular fan blade assembly, thereby improving the injection molding yield of the coiled centrifugal fan blade structure and improving the injection molding production efficiency of the coiled centrifugal fan blade structure;

[0030] 2. A forming device for a coiled centrifugal fan blade structure of the present utility model, by designing an arch-shaped member to reinforce the channel, enhancing the blade strength and reducing the positioning difficulty; during demolding, the ejector pin can abut against the arch-shaped member to easily eject the blade, reducing blade scratching and deformation, reducing the production difficulty of the coiled centrifugal fan blade structure, and reducing the economic loss caused by blade damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic structural diagram of a coiled centrifugal fan blade structure of the present utility model;

[0032] Figure 2 is a schematic structural diagram of the shaft disc of the present utility model;

[0033] Figure 3 is a schematic structural diagram of the shaft sleeve of the present utility model;

[0034] Figure 4 is a schematic diagram of the use state of the ejector pin and the forming structure of the forming device of the present utility model.

[0035] Markings in the figure:

[0036] 1 - shaft disc, 2 - first annular fan blade assembly, 21 - first blade, 22 - first hoop, 3 - second annular fan blade assembly, 31 - second blade, 32 - second hoop, 4 - arch-shaped member, 5 - channel, 6 - shaft sleeve, 61 - frustum member, 62 - sleeve, 7 - limiting member, 8 - shaft hole, 9 - forming structure, 10 - ejector pin. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] The following further describes the present utility model in detail with reference to specific embodiments. However, this should not be construed as limiting the scope of the above-mentioned subject matter of the present utility model to the following embodiments. Any technology implemented based on the content of the present utility model belongs to the scope of the present utility model.

[0038] Unless otherwise specified, in the description of the specific embodiments of the present utility model, the expression terms indicating the orientation or positional relationship such as "upper", "lower", "left", "right", "center", "inner", "outer", etc. are all based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product / device / installation of the present utility model is commonly used. These terms of orientation or positional relationship are only for the convenience of describing the solution of the present utility model or simplifying the description in the specific embodiments, so as to facilitate technicians to quickly understand the solution, rather than indicating or implying that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, it should not be construed as a limitation to the present utility model.

[0039] In addition, if terms such as "horizontal", "vertical", "hanging", "parallel", etc. appear, it does not mean that the corresponding device / component / element is required to be absolutely horizontal or vertical or hanging or parallel, but can be slightly inclined or have a deviation. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined. Or, it can be simply understood that the corresponding device / component / element is arranged in the directions of "horizontal", "vertical", "hanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still perform its function in the solution of the present utility model.

[0040] In addition, the expressions such as "first", "second", "third", etc. in the terms are only used to distinguish the description of the same or similar components, and should not be understood as emphasizing or implying the relative importance of specific components.

[0041] In addition, in the description of the embodiments of the present utility model, "several", "multiple", "a number of" represent at least 2. It can be any situation such as 2, 3, 4, 5, 6, 7, 8, 9, etc., and even can be more than 9.

[0042] In addition, in the description of the technical solution of the present utility model, unless otherwise clearly specified / defined / restricted, where terms such as "set", "installed", "connected", "linked", "provided with", "laid", "arranged" appear, they 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 connection means commonly used in the art such as welding, riveting, bolting, threaded connection, etc. Such a connection can be a mechanical connection, an electrical connection or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements.

[0043] Example 1

[0044] As Figures 1 - 3 shown, a coiled pipe centrifugal fan blade structure includes

[0045] a shaft disc 1, the shaft disc 1 is provided with a shaft hole 8 and a shaft sleeve 6, the shaft sleeve 6 is aligned and communicated with the shaft hole 8, and the shaft sleeve 6 is provided with a limiting member 7 for limiting and fixing a rotating shaft;

[0046] a first annular fan blade assembly 2, the first annular fan blade assembly 2 is connected to the shaft disc 1, the first annular fan blade assembly 2 and the shaft sleeve 6 are located on the same side of the shaft disc 1, the shaft sleeve 6 is located inside the first annular fan blade assembly 2, the first annular fan blade assembly 2 is provided with a channel 5, the channel 5 is disposed opposite to the limiting member 7, and an arch member 4 is disposed in the channel 5, and the arch member 4 is connected to the first annular fan blade assembly 2.

[0047] The rotating shaft passes through the shaft sleeve 6 and the shaft hole 8, and the shaft disc 1 is fixed on the rotating shaft by the limiting member 7 abutting against the rotating shaft; a channel 5 is opened on the first annular fan blade, and a tool operates on the limiting member 7 through the channel 5 to fix the shaft disc 1 and the rotating shaft; an arch member 4 is disposed in the channel 5, and the channel 5 is reinforced by the arch member 4, so that the blade strength of the first annular fan blade assembly 2 is higher, and the blade is prevented from being torn during the molding of the first annular fan blade assembly 2, thereby improving the injection molding yield of the coiled pipe centrifugal fan blade structure and improving the injection molding production efficiency of the coiled pipe centrifugal fan blade structure.

[0048] In one or several embodiments, a second annular fan blade assembly 3, the second annular fan blade assembly 3 is connected to the shaft disc 1, and the first annular fan blade assembly 2 and the second annular fan blade assembly 3 are respectively located on both sides of the shaft disc 1; the shaft hole 8 penetrates through the middle of the shaft disc 1, so that when the rotating shaft drives the shaft disc 1 to rotate, the shaft disc 1 rotates around the axis. By coaxially arranging both the first annular fan blade assembly 2 and the second annular fan blade assembly 3 with the shaft disc 1, a first annular fan blade and a second annular fan blade are respectively disposed on opposite sides of the shaft disc 1. When the rotating shaft drives the shaft disc 1 to rotate, the shaft disc 1 can make the first annular fan blade and the second annular fan blade rotate, thereby generating an air flow in the coiled pipe centrifugal fan blade structure; ensuring that the dynamic balance of the coiled pipe centrifugal fan blade structure during rotation meets the requirements, avoiding the vibration of the rotating shaft, and ensuring that the coiled pipe centrifugal fan blade structure normally generates an air flow.

[0049] In an alternative embodiment, the first annular blade assembly 2 is composed of a first hoop 22 and a plurality of first blades 21. The plurality of first blades 21 are arranged in a ring centered on the axis of the shaft disc 1. Adjacent first blades 21 have a gap therebetween. The first blades 21 are connected to the shaft disc 1, the first hoop 22 is connected to the first blades 21, and the arched member 4 is connected to the first blades 21. The second annular blade assembly 3 includes a second hoop 32 and a plurality of second blades 31. The plurality of second blades 31 are arranged in a ring centered on the axis of the shaft disc 1. Adjacent second blades 31 have a gap therebetween. The second blades 31 are connected to the shaft disc 1, and the second hoop 32 is connected to the second blades 31. The gaps between adjacent first blades 21 allow air flow to pass through, and the gaps between adjacent second blades 31 allow air flow to pass through, causing the blades to rotate to form an air flow. Both the first blades 21 and the second blades 31 are firmly connected to the shaft disc 1. By connecting the first hoop 22 to the first blades 21 and the second hoop 32 to the second blades 31, the first blades 21 and the second blades 31 are strengthened to prevent the first and second blades 31 from shifting in position during rotation. In the first annular blade assembly 2, the arched member 4 is connected to the first blades 21, avoiding weakening the blade strength by opening holes in the blades.

[0050] In an alternative embodiment, both the first hoop 22 and the second hoop 32 are annular structural members. A plurality of first blades 21 are arranged in a ring on the inner ring side of the first hoop 22, and a plurality of second blades 31 are arranged in a ring on the inner ring side of the second hoop 32. A plurality of first blades 21 are arranged in a ring on the inner wall of the first hoop 22, and a plurality of second hoops 32 are arranged on the inner wall of the second hoop 32. The first hoop 22 is spaced from the shaft disc 1, and the first hoop 22 is spaced from the shaft disc 1 to strengthen the first blades 21 and the second blades 31. In some embodiments, the first hoop 22 is connected to the ends of the first blades 21, and the second hoop 32 is connected to the ends of the second blades 31.

[0051] In an alternative embodiment, the arched member 4 is a U-shaped through groove. The ends of the arched member 4 are connected to the shaft disc 1 to form a channel 5, and the top of the arched member 4 is connected to the first blades 21. The U-shaped through groove is buckled on the shaft disc 1, so that the ends of the U-shaped through groove are connected to the shaft disc 1, and the arc section at the top of the U-shaped through groove is connected to the first blades 21.

[0052] In an alternative embodiment, a plurality of first blades 21 are arranged on the edge of the shaft disc 1, and a plurality of second blades 31 are arranged on the edge of the shaft disc 1.

[0053] In one or several embodiments, the bushing 6 is composed of a frustum-shaped member 61 and a sleeve 62. The frustum-shaped member 61 is provided with a through hole adapted to the shaft hole 8. The through hole is aligned and communicated with the shaft hole 8. The frustum-shaped member 61 is connected to the shaft disc 1. The diameter of the frustum-shaped member 61 is larger than that of the sleeve 62. The frustum-shaped member 61 has a larger area, which can ensure that the shaft disc 1 is stressed more evenly and prevent the shaft disc 1 from being damaged when rotating. The sleeve 62 is aligned and communicated with the through hole. The sleeve 62 is connected to the frustum-shaped member 61. The limiting member 7 is connected to the sleeve 62. In some embodiments, the shaft disc 1, the frustum-shaped member 61 and the sleeve 62 are integrally formed as a single piece 9.

[0054] In an alternative embodiment, the sleeve 62 is provided with a through limiting hole in the radial direction. The limiting member 7 is a limiting bolt, and the limiting bolt is threadedly connected to the limiting hole; this facilitates the operator to operate the limiting member 7 through the through hole using a tool.

[0055] In one or several embodiments, the shaft disc 1, the first annular blade assembly 2, the second annular blade assembly 3 and the arched member 4 are integrally formed as a single piece 9; this ensures the structural strength of the coiled tube centrifugal fan blade structure.

[0056] By changing the shape of the screw hole through the arched member 4, the blade strength is improved, and the positioning difficulty of the formed structure 9 can be reduced during core pulling.

[0057] Embodiment 2

[0058] As Figure 4 shown, a forming device for a coiled tube centrifugal fan blade structure. The forming device is used for injection molding of a coiled tube centrifugal fan blade structure in Embodiment 1, and includes a device body. The device body is provided with a forming structure 9 for forming the arched member 4. The forming structure 9 is slidably connected to the device body. The device body is provided with an ejector pin 10 for demolding. The ejector pin 10 is slidably connected to the device body, and the ejector pin 10 can abut against the arched member 4.

[0059] By designing the arched member 4 to reinforce the channel 5, the blade strength is enhanced, and the positioning difficulty is reduced; during demolding, the ejector pin 10 can abut against the arched member 4 to easily eject the blade, reducing the scratching and deformation of the blade, reducing the production difficulty, and reducing the economic loss caused by blade damage.

[0060] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A coiled centrifugal fan blade structure, characterized in that, including a shaft disc (1), the shaft disc (1) is provided with a shaft hole (8) and a shaft sleeve (6), the shaft sleeve (6) is aligned and communicated with the shaft hole (8), and the shaft sleeve (6) is provided with a limiting member (7) for limiting and fixing a rotating shaft; a first annular blade assembly (2), the first annular blade assembly (2) is connected to the shaft disc (1), the first annular blade assembly (2) and the shaft sleeve (6) are located on the same side of the shaft disc (1), the shaft sleeve (6) is located inside the first annular blade assembly (2), the first annular blade assembly (2) is provided with a channel (5), the channel (5) is arranged opposite to the limiting member (7), and an arch member (4) is arranged in the channel (5), and the arch member (4) is connected to the first annular blade assembly (2).

2. The coiled centrifugal fan blade structure according to claim 1, wherein, It further includes a second annular blade assembly (3), the second annular blade assembly (3) is connected to the shaft disc (1), and the first annular blade assembly (2) and the second annular blade assembly (3) are respectively located on both sides of the shaft disc (1); the shaft hole (8) penetrates through the middle of the shaft disc (1), and the first annular blade assembly (2) and the second annular blade assembly (3) are both coaxially arranged with the shaft disc (1).

3. The coiled centrifugal fan blade structure according to claim 2, characterized in that, The first annular blade assembly (2) includes a first hoop (22) and a plurality of first blades (21), the plurality of first blades (21) are arranged in a ring centered on the axis of the shaft disc (1), adjacent first blades (21) have intervals, the first blades (21) are connected to the shaft disc (1), the first hoop (22) is connected to the first blades (21), and the arch member (4) is connected to the first blades (21); the second annular blade assembly (3) includes a second hoop (32) and a plurality of second blades (31), the plurality of second blades (31) are arranged in a ring centered on the axis of the shaft disc (1), adjacent second blades (31) have intervals, the second blades (31) are connected to the shaft disc (1), and the second hoop (32) is connected to the second blades (31).

4. A coiled centrifugal fan blade structure according to claim 3, characterized in that, Both the first hoop (22) and the second hoop (32) are annular structural members, the plurality of first blades (21) are arranged in a ring on the inner ring side of the first hoop (22), and the plurality of second blades (31) are arranged in a ring on the inner ring side of the second hoop (32).

5. The coiled centrifugal fan blade structure according to claim 3, wherein, The arch member (4) is a U-shaped through groove, the end of the arch member (4) is connected to the shaft disc (1) to form the channel (5), and the top of the arch member (4) is connected to the first blade (21).

6. The coil centrifugal fan blade structure according to claim 5, characterized in that, The plurality of first blades (21) are arranged on the edge of the shaft disc (1), and the plurality of second blades (31) are arranged on the edge of the shaft disc (1).

7. A coil centrifugal fan blade structure according to claim 1, characterized in that The bushing (6) includes a frustum member (61) and a sleeve (62). The frustum member (61) is provided with a through hole adapted to the shaft hole (8). The through hole is aligned and communicated with the shaft hole (8). The frustum member (61) is connected to the shaft disc (1). The sleeve (62) is aligned and communicated with the through hole. The sleeve (62) is connected to the frustum member (61). The limiting member (7) is connected to the sleeve (62).

8. The structure of a coiled centrifugal airfoil according to claim 7, characterized in that, The sleeve (62) is provided with a through limiting hole in the radial direction. The limiting member (7) includes a limiting bolt, and the limiting bolt is threadedly connected to the limiting hole.

9. A coil centrifugal fan blade structure according to any one of claims 1 - 8, characterized in that, The shaft disc (1), the first annular wind blade assembly (2) and the arch member (4) are integrally formed structural (9) members.

10. A forming device for a coiled centrifugal fan blade structure, the forming device being used to form a coiled centrifugal fan blade structure as claimed in claim 9, characterized in that, It includes a device body. The device body is provided with a forming structure (9) for forming the arch member (4). The forming structure (9) is slidably connected to the device body. The device body is provided with a thimble (10) for demolding. The thimble (10) is slidably connected to the device body, and the thimble (10) can abut against the arch member (4).

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