Forming mold for medical mask

Abstract

The utility model discloses a forming die for a medical mask, which comprises an upper die, a lower die and an elastic ejection component arranged in the lower die, the elastic ejection component consists of a spring ejector pin and a cavity insert, the spring ejector pin comprises an ejector pin part and an ejection spring, and the lower die is provided with a limiting groove for placing the ejection spring. The upper mold is provided with an air inlet and a cylindrical limiting groove, the air inlet is located in a non-forming key area of the neck of the upper mold, during working, a green body is put into an upper mold cavity and then mold closing is conducted, the cylindrical limiting groove pushes the cavity insert to move downwards to compress the spring ejector pin, the cavity is closed, and supercritical fluid is injected into the cavity through the air inlet to be foamed and formed; during demolding, the upper mold moves upwards, the spring ejector pin rebounds to push the cavity insert to move upwards, the forming mask is driven to be separated from the lower mold, and convenient demolding is achieved. The problem that demolding is difficult is solved through the elastic ejection assembly, the conical exhaust hole exhausts air thoroughly, the air inlet hole is reasonable in arrangement, the product quality and the production efficiency are improved, and the medical mask mold is suitable for batch production of medical masks.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical forming die technical field, concretely relates to a medical mask forming die. BACKGROUND

[0002] Medical mask as important protective equipment, its forming quality directly influences the protection effect and the wearing comfort. Supercritical foaming process can prepare the foam material with uniform density and good air permeability, and has been widely used in medical mask production, but the traditional mold adopts manual prying or single ejector pin demolding, which is easy to cause mask edge damage and deformation, reduce product pass rate and production efficiency; the air in the cavity and the excess gas after supercritical fluid reaction cannot be discharged in time, which is easy to form bubbles and shrinkage holes in the mask, affecting the structural density and protection performance; the gas inlet hole is usually arranged in the key forming area, which is easy to leave marks on the mask surface, and the supercritical fluid is unevenly distributed, resulting in inconsistent mask thickness.

[0003] In view of the above problems, it is urgent to design a medical mask forming die which takes into account convenient demolding, efficient exhaust and uniform gas inlet, to adapt to the production needs of supercritical foaming process. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a medical mask forming die, which solves the problems of difficult demolding, poor exhaust and unreasonable gas inlet of the existing mold, and improves product quality and production efficiency.

[0005] A medical mask forming die, comprising an upper die and a lower die, the upper die and the lower die form a cavity matched with the medical mask after clamping; further comprising an elastic ejection assembly, the elastic ejection assembly is arranged in the lower die and is composed of a spring ejector pin and a cavity insert block, the spring ejector pin comprises a separable ejector pin part and an ejection spring, a plurality of limiting grooves for placing the ejection spring are arranged on the plane of the lower die which is in close contact with the lower plane of the cavity insert block, the diameter of the limiting groove is slightly larger than the outer diameter of the ejection spring, the top end of the ejector pin part is in contact with the bottom of the cavity insert block during clamping, and the bottom end is in contact with the ejection spring; a conical exhaust hole and a gas inlet hole are arranged on the mold, the gas inlet hole is arranged in the neck part of the upper die in a non-key forming area, the conical exhaust hole is composed of the micro-exhaust groove of the parting surface edge of the mold after clamping, and the conical exhaust hole extends along the edge of the cavity; a cylindrical limiting groove is arranged on the inner top of the upper die, and the cylindrical limiting groove is used to push the cavity insert block to move downward during clamping.

[0006] Further, the number of gas inlet holes is 2-3, and the hole diameter is 1.5-2mm, which ensures that the supercritical fluid is uniformly injected into the cavity.

[0007] Further, the inner diameter of the conical exhaust hole is 0.15-0.3mm, and the outer diameter is 1-1.5mm, the small hole on the inner side can prevent the overflow of the formed material, and the large hole on the outer side can improve the exhaust efficiency.

[0008] Further, the spring ejector pins are arranged in an annular array of 3-6 on the bottom of the cavity insert, ensuring balanced force on the cavity insert and smooth demolding.

[0009] Further, the cavity insert is made of hard alloy material, and the forming surface is provided with a polishing layer to improve the smoothness of the forming surface and reduce mask adhesion.

[0010] Further, the upper die and the lower die are both made of die steel, and the surface is provided with a nitriding treatment layer to improve the hardness, wear resistance and corrosion resistance of the mold and prolong the service life.

[0011] Further, the lower die is provided with a guide sleeve corresponding to the position of the spring ejector pin, and the spring ejector pin slides through the guide sleeve to ensure the coaxiality and stability of the reciprocating motion of the spring ejector pin.

[0012] Further, the lower bottom surface of the cavity insert is provided with a protruding cylindrical block, and the plane of the lower die that is in contact with the lower bottom surface of the cavity insert is provided with a circular groove that matches the protruding cylindrical block to improve the stability of the mold clamping.

[0013] Advantages

[0014] Convenient and efficient demolding: the elastic ejection assembly is reset by the spring ejector pin, which drives the cavity insert to synchronously lift the forming mask, realizing the stable separation of the mask and the lower die, avoiding product damage caused by manual prying, and improving the demolding efficiency without damaging the edge of the mask; the split structure of the spring ejector pin and the limiting groove design facilitate installation and replacement, reducing the use and maintenance cost.

[0015] Complete exhaust without defects: the conical exhaust hole extends along the edge of the cavity, the small hole on the inside prevents material overflow, and the large hole on the outside improves efficiency, ensuring that the air and excess supercritical fluid inside the cavity are completely exhausted, and the mask formed has no defects such as air bubbles, shrinkage holes, and material defects.

[0016] Uniform air intake with high quality: the air intake hole is arranged on the neck of the upper die in a non-critical forming area, which does not affect the appearance and performance of the critical forming surface of the mask, and can also make the supercritical fluid uniformly distributed in the cavity, ensuring that the mask has consistent thickness and uniform density, and the wearing comfort and protection performance are significantly improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present application, and constitute a part of the specification, together with the embodiments of the present application, to explain the present application, and do not constitute a limitation on the present application. In the drawings:

[0018] Figure 1 is a structural schematic diagram of the present application;

[0019] Figure 2The upper die structure schematic view of the utility model;

[0020] Figure 3 The upper die structure schematic view of the utility model;

[0021] Figure 4 The conical exhaust hole cross section enlarged structure schematic view of the utility model;

[0022] Figure 5 The lower die structure schematic view of the utility model;

[0023] Figure 6 The lower die structure schematic view of the utility model;

[0024] Figure 7 The cavity insert structure schematic view of the utility model;

[0025] In the drawing,

[0026] 1-upper die, 2-lower die, 3-spring ejector pin, 4-conical exhaust hole, 5-inlet hole, 6-cylindrical limiting groove, 7-cavity insert, 8-protruding cylindrical block, 9-circular groove. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the utility model will be apparently and completely described in conjunction with the drawings of the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0028] As Figures 1-7 indicated;

[0029] A medical mask forming die.

[0030] In the embodiment: to solve the technical problems existing in the prior art, as disclosed in the background art above, "the traditional die is usually manually pried or single ejector pin demoulding, which is easy to cause the edge of the mask to be damaged and deformed, reduce the product qualified rate and production efficiency, the excess gas in the cavity and after the supercritical fluid reaction cannot be discharged in time, which is easy to form bubbles and shrinkage holes in the mask, and affect the structural density and protection performance, the inlet hole is usually arranged in the key forming area, which is easy to leave marks on the surface of the mask, and the supercritical fluid is unevenly distributed, which causes the mask thickness to be inconsistent", in combination with the actual use, this problem is obviously a practical problem and is relatively difficult to solve, therefore, to solve this technical problem, a medical mask forming die is provided on this basis.

[0031] Embodiment 1

[0032] AsFigure 1 、 Figure 5 、 Figure 6 and Figure 7 as shown in the drawings;

[0033] The embodiment provides a medical mask forming die, and the specific structure is as follows:

[0034] The upper die 1 and the lower die 2 are both made of die steel, and the surfaces are subjected to nitriding treatment to improve the hardness and corrosion resistance of the die; after the upper die 1 and the lower die 2 are combined, a cavity completely matched with the profile of the medical mask is formed, thereby ensuring the precision of the product size.

[0035] The elastic ejection assembly is arranged in the lower die 2 and comprises separable spring ejectors 3 and a cavity insert 7; in the embodiment, the spring ejectors 3 are arranged in an annular array on the bottom of the cavity insert 7 and are uniformly distributed at equal intervals, thereby ensuring force balance; the spring ejector 3 comprises a separable ejector part and an ejection spring; a plurality of limiting grooves for placing the ejection spring are arranged on the plane of the lower die 2 in close contact with the lower plane of the cavity insert 7, the diameter of the limiting groove is slightly larger than the outer diameter of the spring, the difference is between 0.5 cm and 1 cm, so that the ejection spring can be easily compressed and rebounded in the limiting groove, and the stable transmission direction of the force is ensured; the top end of the ejector part abuts against the bottom of the cavity insert 7 when the die is combined, and the bottom end abuts against the ejection spring; when the die is first installed, the ejection spring is installed in the limiting groove, and then the ejector part is put in; at this time, the ejector part is partially located in the limiting groove to play a positioning and guiding role, and is partially exposed outside the limiting groove to be pressed down by the bottom of the cavity insert 7 when the die is combined, thereby compressing the ejection spring, realizing the combination of the die, and when the die is opened, the rebounding force of the ejection spring is transmitted through the ejector part to eject the cavity insert 7 by a small distance, thereby realizing the demolding of the mask. Through the structure design, on the one hand, the installation is convenient and the subsequent replacement of the spring ejector 3 is also easy, and on the other hand, the function is easy to implement, the ejection of the mask product can be realized through a very low-cost structure, and the problem of mask damage caused by the traditional demolding mode is avoided.

[0036] The lower bottom surface of the cavity insert 7 is provided with a protruding cylindrical block 8, and the plane of the lower die 2 in close contact with the lower bottom surface of the cavity insert 7 is provided with a circular groove 9 matched with the protruding cylindrical block 8, thereby realizing the preliminary positioning of the cavity insert 7 during installation and improving the stability during overall die combination.

[0037] As shown in the drawings, Figure 3 the neck part of the upper die 1 is provided with air inlet holes 5 in a non-molding key area, the number of the air inlet holes 5 is two, the air inlet holes 5 are symmetrically distributed, the hole diameter is 1.8 mm, the air inlet holes 5 are sealingly connected with the gas injection pipeline of the supercritical foaming equipment, and the supercritical fluid is uniformly injected into the cavity.

[0038] As shown in the drawings, Figure 2 and Figure 4As shown, the parting surface edge of the mold is provided with a micro exhaust groove, and the micro exhaust grooves on the upper mold 1 and the lower mold 2 form a conical exhaust hole 4 after the mold is closed. The conical exhaust hole 4 has four numbers, respectively extending to the southeast, southwest and northwest. The conical exhaust hole 4 continuously extends along the edge of the cavity until it is connected with the outside of the mold. The inner diameter of the conical exhaust hole 4 is 0.2mm, and the outer diameter is 1.2mm. The inner side is communicated with the cavity, and the outer side is communicated with the atmosphere, realizing efficient exhaust and preventing overflow.

[0039] As shown in Figure 3 , Figure 6 and, Figure 7 , the inner top of the upper mold 1 is integrally formed with a cylindrical limiting groove 6. The axis of the cylindrical limiting groove 6 coincides with the center axis of the cavity insert 7. When the mold is closed, the cylindrical limiting groove 6 can precisely act on the center of the cylindrical part at the top of the cavity insert 7, and push the cavity insert 7 to move downward stably. Figure 7 As shown in Figure 7 , the lower bottom surface of the cavity insert 7 can be further provided with a protruding cylindrical block 8. The lower mold 2 is further provided with a circular groove 9 on the plane which is in close contact with the lower bottom surface of the cavity insert 7, so as to realize the preliminary positioning of the cavity insert 7 during installation and improve the stability during overall mold closing. The cavity insert 7 is made of hard alloy material, and the forming surface is mirror polished to reduce the adhesion between the forming surface cover and the cavity insert 7, and to improve the smoothness of demolding and the surface finish of the product.

[0040] The working process of the embodiment is as follows:

[0041] Green body placement: the foaming material green body is placed in the cavity inside the upper mold 1. The size of the green body is slightly smaller than the cavity to ensure that there is expansion space after the mold is closed.

[0042] Mold closing: the upper mold 1 is controlled to move downward. After the cylindrical limiting groove 6 contacts the top of the cavity insert 7, the cavity insert 7 is pushed to move downward along the vertical direction. The spring ejector pin 3 is compressed until the bottom of the cavity insert 7 is in close contact with the positioning surface in the lower mold 2, and the parting surface of the upper mold 1 and the lower mold 2 is in close contact, and the cavity is closed.

[0043] Supercritical foaming: the supercritical foaming equipment injects supercritical CO2 fluid into the cavity through the gas inlet hole 5. The supercritical fluid uniformly penetrates the green body and makes it expand to fill the cavity. The air and excess fluid in the cavity are discharged through the conical exhaust hole 4. At the same time, according to the conventional foaming parameters, the foaming treatment is carried out.

[0044] Demolding: after the foaming is completed, the upper mold 1 is controlled to move upward. After the cylindrical limiting groove 6 is separated from the cavity insert 7, the top of the cavity insert 7 loses the downward pressure. At this time, the multiple spring ejector pins 3 simultaneously rebound, pushing the cavity insert 7 to move upward by a small distance. The cavity insert 7 drives the forming surface cover to separate from the cavity of the lower mold 2. The operator directly takes down the cover, completing a molding cycle.

[0045] The medical mask supercritical foaming forming convenient demolding, efficient exhaust and uniform air intake are realized by the structure design, and the production efficiency is effectively improved.

[0046] Finally, it should be noted that: the above is only the preferred embodiment of the present application, and is not intended to limit the present application, although the foregoing embodiments of the present application are described in detail, for those skilled in the art, it still can be modified, or part of the technical features of the equivalent replacement. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included within the scope of the present application.

Claims

1. A molding die for a medical face mask, characterized by, The utility model relates to a medical mask injection mold, including upper die (1) and lower die (2), and upper die (1) and lower die (2) form the cavity matched with medical mask after closing mould, still include the elastic ejection assembly for the convenience of stripping, and the elastic ejection assembly is located in lower die (2), including spring ejector pin (3) and cavity insert (7), spring ejector pin (3) includes separable ejector pin part and ejector spring, the plane of lower die (2) and the lower plane of cavity insert (7) is attached to the plane and is equipped with a plurality of limit groove for placing ejector spring, the diameter of limit groove is slightly larger than the outer diameter of ejector spring, the top end of ejector pin part is in contact with the bottom of cavity insert (7) when closing mould, and the bottom end is in contact with ejector spring, the mold is provided with taper exhaust hole (4) and air inlet hole (5), air inlet hole (5) is equipped with in the neck part of upper die (1) non -shaped key area, the taper exhaust hole (4) is equipped with in the micro -exhaust groove of mold parting surface edge, and the micro -exhaust groove on upper die (1) and lower die (2) constitutes taper exhaust hole after closing mould, and the taper exhaust hole extends along the edge of cavity, and the inner top of upper die (1) is provided with cylindrical limit groove (6) for driving cavity insert (7) to move down.

2. The molding die for a medical face mask according to claim 1, wherein The number of air inlet hole (5) is 2-3, and the hole diameter is 1.5-2mm.

3. The molding die for a medical face mask according to claim 1, wherein The inner hole diameter of taper exhaust hole is 0.15-0.3mm, and the outer hole diameter is 1-1.5mm.

4. The molding die for a medical face mask according to claim 1, wherein Spring ejector pin (3) is provided with 3-6, and the annular array is uniformly distributed along the bottom of cavity insert (7).

5. The molding die for a medical face mask according to claim 1, wherein Cavity insert (7) is made of hard alloy material, and the forming surface is provided with a polishing layer.

6. The molding die for a medical face mask according to claim 1, wherein Upper die (1) and lower die (2) are made of die steel, and the surface is provided with a nitriding treatment layer.

7. The molding die for a medical face mask according to claim 1, wherein Lower die (2) is provided with a guide sleeve corresponding to the position of spring ejector pin (3), and spring ejector pin (3) is slidably arranged in the guide sleeve.

8. The molding die for a medical face mask according to claim 1, wherein The lower bottom surface of cavity insert (7) is provided with a protruding cylindrical block (8), and the plane of lower die (2) and the lower bottom surface of cavity insert (7) is provided with a circular groove (9) matched with the protruding cylindrical block.

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