Injection pipe structure of headrest foaming mold

Abstract

The utility model provides a material injection pipe structure of a headrest foaming mould, which comprises a material injection pipe capable of being connected with a material injection port of the foaming mould, the material injection pipe comprises a funnel part and a connecting seat which is fixedly connected with the upper end of the funnel part and can be detachably and fixedly connected with the foaming mould, and the connecting seat is provided with a through hole communicated with the interior of the funnel part. A valve capable of sealing the through hole is arranged in the connecting seat; in a normal state, the valve is in an open state, or the valve can be ejected by a gun nozzle when the gun nozzle of the material injection equipment is inserted; and when material injection is finished and the gun nozzle leaves, the valve can be closed to seal the through hole under the pressure action of the foaming material. According to the utility model, the valve is arranged in the material injection pipe, and after material injection is finished, the valve is closed, so that a foaming material can be prevented from overflowing from the material injection pipe, the overflowing waste of the foaming material is reduced, and the foaming material injected into the headrest cover by material injection equipment is reduced, thereby saving the cost; and after the valve is arranged in the material injection pipe, the retention time of the gun nozzle in the material injection pipe does not need to be prolonged, and the production efficiency is not influenced.

Description

Technical Field

[0001] The utility model belongs to the field of foaming moulds, and in particular relates to an injection pipe structure of a headrest foaming mould. Background Art

[0002] The mold for foaming molding is a plastic foaming mold. During the foaming molding process, a large number of tiny bubble nuclei are formed through the addition and reaction of physical foaming agents or chemical foaming agents. The bubble nuclei grow to form a honeycomb or porous structure to make foam plastic parts.

[0003] When injecting material into the headrest foaming mold, the nozzle of the injection equipment is aligned with and inserted into the injection tube of the foaming mold, and the foaming material enters the headrest cover in the cavity through the injection tube, such as the foaming headrest injection tube mechanism disclosed in CN202022218793.8. After the injection is completed, the pressure in the headrest cover increases, and there is a problem of foaming material flowing back and staining the injection tube and overflowing from the injection tube. By removing the injection tube and soaking it in hot water or a release agent, the remaining foaming material can be easily pulled out and the residual material in the injection tube can be cleaned up; however, if the foaming material overflows from the injection tube, it will cause waste. By making the nozzle leave the injection tube later, the foaming material overflowing from the injection tube can be reduced, the waste of foaming material can be reduced, and costs can be saved. However, the injection time will be extended, which will affect production efficiency, and it is necessary to make improvements. Utility Model Content

[0004] The utility model aims to solve the technical problems existing in the prior art and provides an injection pipe structure of a headrest foaming mould.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: an injection tube structure of a headrest foaming mold, comprising an injection tube that can be connected to the injection port of the foaming mold, the injection tube comprising a tapered funnel portion, and a connecting seat fixedly connected to the upper end of the funnel portion and capable of being detachably fixedly connected to the foaming mold, the connecting seat having a through hole connected to the interior of the funnel portion, and a valve capable of closing the through hole being provided in the connecting seat; in normal state, the valve is in an open state, or the valve can be pushed open by the gun nozzle when the gun nozzle of the injection equipment is inserted; when the gun nozzle is removed after the injection is completed, the valve can automatically close to close the through hole under the action of the pressure of the foaming material.

[0006] The above technical scheme, by arranging a valve in the injection tube, the valve is closed after the injection is completed, which can prevent the foaming material from overflowing from the injection tube, reducing the overflow waste of the foaming material. While maintaining the amount of foaming material in the headrest cover, the foaming material injected into the headrest cover by the injection equipment can be reduced to save costs; and after the valve is arranged in the injection tube, there is no need to extend the residence time of the gun nozzle in the injection tube, which does not affect the production efficiency.

[0007] In a preferred embodiment of the utility model, the valve includes a baffle plate disposed in the through hole and capable of closing the through hole, one end of the baffle plate is rotatably connected to the inner wall of the through hole via a rotating shaft, and the other end of the baffle plate is a free end capable of turning downward around the rotating shaft.

[0008] In the above technical solution, the baffle is rotatably connected to the inner wall of the through hole via the rotating shaft, and the valve can be opened or closed by rotating the baffle around the rotating shaft, which is simple to operate.

[0009] In a preferred embodiment of the present invention, a limiting portion capable of limiting the upper end of the baffle in a closed state is provided on the inner wall of the through hole.

[0010] The above technical solution, by providing the limiting part, can prevent the baffle from being pushed upward too much and opened by the pressure of the foaming material when the gun nozzle leaves after the injection is completed.

[0011] In a preferred embodiment of the utility model, the valve also includes a torsion spring sleeved on the rotating shaft and fixed thereto. In normal state, under the action of the torsion spring, the baffle is in a closed state, and the baffle can be pushed downward by the gun nozzle when the gun nozzle is inserted. When the injection is completed and the gun nozzle is removed, the baffle can be reset and is in a closed state under the action of the torsion spring.

[0012] The above technical solution, by setting a torsion spring, makes the valve a normally closed valve, which can prevent the baffle from swinging in the through hole in normal state; when the injection is completed and the gun nozzle leaves, the torsion spring resets the baffle to close the through hole.

[0013] In another preferred embodiment of the utility model, a receiving groove communicated with the through hole is provided in the connecting seat, one end of the baffle plate rotating shaft is elastically connected to the receiving groove through an elastic member, the rotating shaft is connected to a handle extending outside the connecting seat, and the baffle plate can be stored in the receiving groove by pulling the handle in a direction away from the through hole.

[0014] The above technical solution, by providing a receiving groove to receive the baffle, does not need to flip the baffle upwards to occupy the space of the through hole when the residual foaming material needs to be pulled out, which is more conducive to the smooth pulling out of the residual foaming material.

[0015] In another preferred embodiment of the utility model, a handle is connected to each of the rotating shafts on both sides of the baffle, and a slide groove communicating with the accommodating groove is provided on the side wall of the connecting seat, and the handle is located in the slide groove and can slide in the slide groove.

[0016] The above technical solution provides two handles, which can distribute force more evenly, making the sliding of the baffle smoother, and the two handles are more conducive to applying force, so that it can be operated with one hand.

[0017] In another preferred embodiment of the present invention, the through hole is a rectangular hole, and the lower end of the through hole and the upper end of the funnel portion are smoothly transitioned.

[0018] In the above technical solution, compared with the circular hole, the rectangular hole can connect the rotating shaft with the side of the baffle, so that the effective space of the opened through hole is larger, which is conducive to the insertion of the gun nozzle.

[0019] In another preferred embodiment of the present invention, the lower end of the funnel portion is connected to a circular tube of equal diameter, and the inner diameter of the circular tube is equal to the inner diameter of the small end of the funnel portion.

[0020] The above technical solution facilitates the insertion of the injection tube into the injection port of the mold by arranging the cylinder.

[0021] In another preferred embodiment of the present invention, a slot is provided on the outer wall of the connecting seat, and the foaming mold is provided with a movable block that can be inserted into or out of the slot.

[0022] The above technical solution enables the injection tube to be detachably connected to the foaming mold by means of a movable clamping block and a clamping slot, and is easy to operate.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0025] Figure 1 This is a front cross-sectional view of the injection pipe structure of the headrest foaming mold of the first embodiment. Figure 1 , the baffle is in closed state.

[0026] Figure 2 yes Figure 1 AA section diagram in.

[0027] Figure 3 This is a front cross-sectional view of the injection pipe structure of the headrest foaming mold of Example 1. Figure 2 , the baffle is in the open state.

[0028] Figure 4 This is a front cross-sectional view of the injection pipe structure of the headrest foaming mold of the first embodiment. Figure 3 , the baffle is stored in the receiving groove.

[0029] Figure 5 yes Figure 4 BB cross-sectional view in .

[0030] Figure 6 It is a top view schematic cross-sectional view of the injection pipe structure of the headrest foaming mold of the second embodiment, and the baffle is in a closed state.

[0031] The figure marks in the drawings of the specification include: injection tube 10, connecting seat 11, through hole 111, slot 112, limiting portion 113, accommodating slot 114, slide slot 115, funnel portion 12, round tube 13, valve 20, baffle 21, rotating shaft 22, torsion spring 23, elastic member 30, counter block 40, handle 50, blind hole 51. DETAILED DESCRIPTION

[0032] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0033] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "vertical", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0034] In the description of the present utility model, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection of two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0035] Embodiment 1

[0036] This embodiment provides an injection pipe structure of a headrest foaming mold, such as Figure 1-Figure 3As shown, in a preferred embodiment, the injection tube structure includes an injection tube 10 that can be connected to the injection port of the foaming mold. The injection tube 10 is made of plastic as a whole. The injection tube 10 includes a conical funnel 12 and a rectangular connecting seat 11 fixed to the upper end of the funnel 12 and can be detachably fixedly connected to the foaming mold. The connecting seat 11 has a through hole 111 that is connected to the inside of the funnel 12, and a valve 20 that can close the through hole 111 is provided in the connecting seat 11. Specifically, a card slot 112 can be provided on the two opposite outer walls of the connecting seat 11, and the foaming mold is provided with a movable card block that can be inserted into or out of the card slot 112. By means of the movable card block and the card slot 112, the injection tube 10 is detachably connected to the foaming mold, which is convenient to operate; preferably, the lower end of the funnel 12 is connected to a circular tube 13 of equal diameter, the inner diameter of the circular tube 13 is equal to the inner diameter of the small end of the funnel 12, and the lower end of the circular tube 13 has a guide angle.

[0037] Under normal circumstances, the valve 20 is in an open state, or when the nozzle of the injection device is inserted, the valve 20 can be pushed open by the nozzle, so that the injection process of the foaming material can proceed smoothly; when the injection is completed and the nozzle is removed, under the pressure of the foaming material in the headrest cover, the valve 20 can automatically close to seal the through hole 111, thereby preventing the foaming material from overflowing from the injection pipe 10, reducing the waste of the foaming material and saving costs.

[0038] When it is necessary to clean the residual foaming material in the injection tube 10, remove the injection tube 10 from the foaming mold, soak the injection tube 10 with hot water or a mold release agent, open the valve 20, and then the residual foaming material in the injection tube 10 can be easily pulled out from the through hole 111. It should be noted that in order not to affect production, several injection tubes 10 are configured on site. After removing the used injection tube 10, a clean injection tube 10 with the foaming material removed is replaced during the next injection.

[0039] In this embodiment, the valve 20 includes a baffle 21 disposed in the through hole 111 and capable of closing the through hole 111, and the shape and size of the baffle 21 are adapted to the through hole 111. Both sides of one end of the baffle 21 are rotatably connected to the inner wall of the through hole 111 through a rotating shaft 22, the axis of the rotating shaft 22 is perpendicular to the center line of the through hole 111, and the other end of the baffle 21 is a free end that can be turned downward around the rotating shaft 22. Among them, the through hole 111 is a rectangular hole, and preferably the lower end of the through hole 111 and the upper end of the funnel portion 12 are smoothly transitioned.

[0040] Normally, such as Figure 3 As shown, under the action of gravity, the baffle 21 turns downward and is in an open state; or the baffle 21 completely or partially closes the through hole 111. When the gun nozzle is inserted, the gun nozzle pushes the baffle 21 downward to rotate around the rotation axis 22 to open. When the injection is completed and the gun nozzle is removed, under the pressure of the foaming material in the headrest cover, the baffle 21 rotates upward around the rotation axis 22 to a horizontal state to close the through hole 111.

[0041] In a preferred embodiment, when the injection is completed and the gun nozzle is removed, in order to prevent the pressure of the foaming material from pushing the baffle 21 upward too much and opening it, a limiting portion 113 capable of limiting the upper end of the baffle 21 in a closed state is provided on the inner wall of the through hole 111. In this embodiment, the limiting portion 113 can be an elastic buckle provided on the inner wall of the through hole 111. In normal state, the elastic buckle extends into the through hole 111 and can limit the upper end of the baffle 21; when it is necessary to pull out the residual foaming material, the elastic buckle is pressed to retract it into the inner wall of the through hole 111, and the baffle 21 can be flipped upward (specifically, a pull rod or a pull ring can be provided on the baffle 21 for operation) to pull out the residual foaming material.

[0042] like Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, a receiving groove 114 communicating with the through hole 111 is provided in the connecting seat 11, and one end of the rotating shaft 22 of the baffle 21 is elastically connected to the receiving groove 114 through an elastic member 30; the rotating shaft 22 is connected to a handle 50 extending outside the connecting seat 11, and the baffle 21 can be received in the receiving groove 114 by pulling the handle 50 in a direction away from the through hole 111.

[0043] The elastic member 30 is a columnar spring, the right end of the elastic member 30 is fixedly connected to the right side wall of the receiving groove 114, and the left end of the elastic member 30 is fixedly connected to the abutment block 40. Under the elastic force of the elastic member 30, the left end of the abutment block 40 contacts the right end of the baffle 21, and does not hinder the rotation of the baffle 21 around the rotating shaft 22. When the residual foaming material needs to be pulled out, the handle 50 is pulled to the right to overcome the elastic force of the elastic member 30. The handle 50 makes the baffle 21 slide to the right in the receiving groove 114 through the rotating shaft 22 and is completely received in the receiving groove 114, so that the through hole 111 is fully opened to pull out the residual foaming material. After the residual foaming material is pulled out, the handle 50 is released. Under the action of the elastic member 30, the baffle 21 slides to the left in the receiving groove 114 and finally slides into the through hole 111.

[0044] In this embodiment, when pulling out the residual foaming material, there is no need to flip the baffle plate 21 upwards, but the baffle plate 21 is stored in the receiving groove 114 , and the limiting portion 113 can be a step or a block provided on the inner wall of the through hole 111 .

[0045] Preferably, a handle 50 is connected to the rotating shaft 22 on both sides of the baffle 21, and a slide groove 115 communicating with the receiving groove 114 is provided on the side wall of the connecting seat 11. The handle 50 is located in the slide groove 115 and can slide in the slide groove 115. The left and right ends of the slide groove 115 are respectively used to limit the left and right positions of the handle 50, so that the baffle 21 can completely slide into the through hole 111 or be completely received in the receiving groove 114. When the baffle 21 needs to be received in the receiving groove 114, the injection tube 10 is held with one hand, the thumb is pressed against the right outer wall of the connecting seat 11, and one finger is used to press a handle 50 on each side of the connecting seat 11 to slide in the slide groove 115, and the operation can be completed with one hand.

[0046] In this embodiment, the baffle 21 is fixedly connected to the rotating shaft 22, and the rotating shaft 22 is fixedly connected or rotationally connected to the handle 50. When the rotating shaft 22 and the handle 50 are fixedly connected, the handle 50 can not only slide in the slide groove 115, but also rotate in the slide groove 115, and the handle 50 is a cylindrical handle 50 adapted to the width of the slide groove; when the rotating shaft 22 and the handle 50 are rotationally connected, the handle 50 can only slide in the slide groove 115 and cannot rotate in the slide groove 115, and the handle 50 can adopt a non-cylindrical handle 50, such as a rectangular handle 50 adapted to the width of the slide groove.

[0047] Embodiment 2

[0048] The structural principle of this embodiment is basically the same as that of the first embodiment, except that Figure 6 As shown, the valve 20 further includes a torsion spring 23 which is sleeved on the rotating shaft 22 and fixed thereto. In normal state, under the action of the torsion spring 23, the baffle 21 is in a horizontal closed state, closing the through hole 111, and preventing the baffle 21 from swinging in the through hole 111; when the gun nozzle is inserted, the gun nozzle makes the baffle 21 turn downward around the rotating shaft 22 and push the baffle 21 downward to open the through hole 111; when the gun nozzle leaves after the injection is completed, under the action of the torsion spring 23, the baffle 21 can be reset to a horizontal closed state to prevent the foaming material from overflowing.

[0049] In this embodiment, the handle 50 is a rectangular handle, the handle 50 is clamped in the slide groove 115 and can slide in the slide groove 115, the rotating shaft 22 is rotatably connected to the handle 50, a blind hole 51 is provided in the handle 50, the end of the rotating shaft 22 is inserted into the blind hole 51 of the handle 50 and can rotate in the blind hole 51, the torsion spring 23 is located in the blind hole 51, and the two torsion arms of the torsion spring 23 are fixedly connected to the inner wall of the blind hole 51. When the gun nozzle is inserted to make the baffle 21 turn downward around the rotating shaft 22, the torsion spring 23 accumulates force, and when the gun nozzle is removed, the torsion spring 23 that accumulates force releases elastic force to reset the baffle 21.

[0050] In the description of this specification, the description with reference to the terms "preferred embodiment", "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0051] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An injection pipe structure of a headrest foaming mold, characterized in that: The invention comprises an injection pipe which can be connected to the injection port of the foaming mold, the injection pipe comprises a conical funnel portion, and a connection seat which is fixed to the upper end of the funnel portion and can be detachably fixedly connected to the foaming mold, the connection seat has a through hole which is connected to the inside of the funnel portion, and a valve which can close the through hole is provided in the connection seat; In normal state, the valve is in an open state, or the valve can be pushed open by the nozzle of the injection device when the nozzle is inserted; When the injection is completed and the gun nozzle is removed, the valve can be automatically closed under the pressure of the foaming material to seal the through hole.

2. The injection pipe structure of the headrest foaming mold according to claim 1, characterized in that: The valve comprises a baffle plate which is arranged in the through hole and can close the through hole. One end of the baffle plate is rotatably connected to the inner wall of the through hole through a rotating shaft, and the other end of the baffle plate is a free end which can be turned downward around the rotating shaft.

3. The injection pipe structure of the headrest foaming mold according to claim 2, characterized in that: A limiting portion capable of limiting the upper end of the baffle in a closed state is provided on the inner wall of the through hole.

4. The injection pipe structure of the headrest foaming mold according to claim 2, characterized in that: The valve also includes a torsion spring sleeved on the rotating shaft and fixed thereto. In normal state, under the action of the torsion spring, the baffle is in a closed state. When the gun nozzle is inserted, the baffle can be pushed downward by the gun nozzle. When the injection is completed and the gun nozzle is removed, under the action of the torsion spring, the baffle can be reset and is in a closed state.

5. The injection pipe structure of the headrest foaming mold according to claim 2, characterized in that: The connecting seat is provided with a receiving groove communicated with the through hole, and one end of the baffle plate is elastically connected to the receiving groove through an elastic member, and the rotating shaft is connected to a handle extending outside the connecting seat, and the baffle plate can be received in the receiving groove by pulling the handle in a direction away from the through hole.

6. The injection pipe structure of the headrest foaming mold according to claim 5, characterized in that: A handle is connected to the rotating shafts on both sides of the baffle respectively, and a sliding groove communicating with the accommodating groove is provided on the side wall of the connecting seat, and the handle is located in the sliding groove and can slide in the sliding groove.

7. An injection pipe structure of a headrest foaming mold according to any one of claims 1 to 6, characterized in that: The through hole is a rectangular hole, and the lower end of the through hole and the upper end of the funnel portion are smoothly transitioned.

8. An injection pipe structure of a headrest foaming mold according to any one of claims 1 to 6, characterized in that: The lower end of the funnel portion is connected with a circular tube of equal diameter, and the inner diameter of the circular tube is equal to the inner diameter of the small end of the funnel portion.

9. An injection pipe structure of a headrest foaming mold according to any one of claims 1 to 6, characterized in that: A card slot is arranged on the outer wall of the connecting seat, and a movable card block which can be inserted into or separated from the card slot is arranged on the foaming mold.

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