A structure, filter and mold for enhancing bonding strength between injection molded parts and filter screen

Abstract

The present invention provides a structure for enhancing the bonding strength between an injection molded part and a filter screen, a structure for enhancing the bonding strength between an injection molded part and a filter screen, the filter screen having a connection hole, the connection end of the injection molded part being formed and connected to the connection hole, characterized in that: the portion of the connection end located above the filter screen is provided with a plurality of upper notches to form a plurality of upper teeth, the portion of the connection end located below the filter screen is provided with a plurality of lower notches staggered with the upper notches to form a plurality of lower teeth, the upper teeth cover the lower notches below them, and the lower teeth cover the upper notches above them. The connection end of the injection molded part in the present invention is designed with alternating slots, which can increase the contact area between the particle flow material and the filter screen after solidification, avoid virtual connection, increase the connection strength and reduce the amount of particles used.

Description

Technical Field

[0001] The invention belongs to the technical field of filters, and in particular relates to a structure, a filter and a mold for enhancing the bonding strength between an injection molded part and a filter net. Background Art

[0002] like Figure 1 A filter shown includes an injection molded part and a filter. The filter has a connecting hole, and one end of the injection molded part is a ring structure. The ring structure is connected to the connecting hole of the filter through an injection molding process. During production, the filter needs to be placed in a mold, and then the mold is closed for injection molding. After pressure maintenance, the mold is opened to obtain a molded product. Since the particle flow material solidifies quickly, this ring structure will cause a virtual connection when the particle flow material contacts the filter during injection molding, affecting the connection strength. In addition, since the filter is a flexible material, the part of the filter located in the mold cavity during injection molding will be offset by the particle flow material, which will also affect the connection strength of the product after molding. Summary of the invention

[0003] The object of the present invention is to provide a structure for enhancing the bonding strength between an injection molded part and a filter screen, which can reduce virtual connections, prevent the filter screen from shifting, and thus improve the product yield.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a structure for enhancing the bonding strength between an injection molded part and a filter screen, the filter screen having a connecting hole, the connecting end of the injection molded part being formed and connected at the connecting hole, characterized in that: a portion of the connecting end located above the filter screen is provided with a plurality of upper notches to form a plurality of upper teeth, a portion of the connecting end located below the filter screen is provided with a plurality of lower notches staggered with the upper notches to form a plurality of lower teeth, the upper teeth cover the lower notches below them, and the lower teeth cover the upper notches above them.

[0005] Furthermore, the radial dimensions of the upper notch and the lower notch are not less than half of the radial dimension of the connection portion between the filter screen and the connection end.

[0006] Furthermore, upper fillets are provided between the outer circumferential surface of the upper tooth portion and the side surfaces of the upper notches on both sides thereof, and lower fillets are provided between the outer circumferential surface of the lower tooth portion and the side surfaces of the lower notches on both sides thereof.

[0007] Furthermore, a connection fillet is provided at a connection point between the connection end of the injection molded part and its body.

[0008] The present invention also provides a filter, comprising an injection molded part and a filter net, wherein the injection molded part and the filter net are connected via the above structure.

[0009] The present invention also provides a mold, including an upper mold core and a lower mold core, the upper mold core has an upper cavity, and the lower mold core has a lower cavity. After the upper mold core and the lower mold core are molded together, the upper cavity and the lower cavity form an injection cavity for injecting the molded part in the above-mentioned filter.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] 1) The connection end of the injection molded part of the present invention is designed with an alternate slot, which can increase the contact area between the particle flow material and the filter screen after solidification, avoid virtual connection, improve the connection strength and reduce the amount of particles.

[0012] 2) Due to the slotted structure of the connection end of the injection molded part, the mold of the present invention adds a positioning structure near the connection hole of the filter screen, thereby preventing the filter screen from being offset due to the particle flow, which helps to improve the injection molding quality.

[0013] 3) The present invention is applicable to various types of plastic materials and mesh materials, including but not limited to polyethylene, polypropylene, nylon, and various metal and fiber mesh parts. It can also be realized by injection molding, 3D printing or mechanical processing, without the need for complex process flow, and is easy to mass produce. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural stereogram of the prior art;

[0015] Figure 2 It is a structural stereogram of Embodiment 1 of the present invention;

[0016] Figure 3 for Figure 2 An exploded view of the structure of the embodiment shown;

[0017] Figure 4 for Figure 2 A top view of the structure of the illustrated embodiment;

[0018] Figure 5 for Figure 4 Structural cross-section view along the AA axis;

[0019] Figure 6 It is a partial enlarged view of the second embodiment of the present invention.

[0020] Figure numerals: 1. filter screen; 1.1. connecting hole; 2. injection molded part; 2.1. connecting end; 2.1a. upper tooth portion; 2.1b. lower tooth portion; 2.1c. upper slot; 2.1d. lower slot; 2.1e. upper fillet; 2.1f. lower fillet; 2.1g. connecting fillet; 2.2. body; 3. upper mold core; 3.1. upper cavity; 4. lower mold core; 4.1. lower cavity. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention are described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Embodiment 1: Figures 2 to 5 As shown, this embodiment discloses a filter, including an injection molded part 2 and a filter screen 1, the filter screen 1 has a connecting hole 1.1, the injection molded part 2 has a body 2.2 and a connecting end 2.1 formed with one end of the body 2.2, and the connecting end 2.1 is formed at the connecting hole 1.1 of the filter screen 1 so as to fix the filter screen 1 and the injection molded part 2.

[0023] Since the diameter of the connection hole 1.1 is smaller than the outer diameter of the connection end 2.1, a circle of mesh at the connection hole 1.1 will inevitably be embedded in the connection end 2.1 after injection molding, thereby dividing the connection end 2.1 into two parts, the upper part located above the filter screen 1 is provided with a plurality of upper notches 2.1c to form a plurality of upper teeth 2.1a, and the lower part located below the filter screen 1 is provided with a plurality of lower notches 2.1d interlaced with the upper notches 2.1c to form a plurality of lower teeth 2.1b. The upper teeth 2.1a cover the lower notches 2.1d below them, and the lower teeth 2.1b cover the upper notches 2.1c above them. In this way, the projections formed by all the teeth on the connection end 2.1 on the filter screen 1 are the same as those formed by the upper notches 2.1d and the lower notches 2.1b. Figure 1 The projection of the contact part of the middle connection end 2.1 and the filter screen 1 is consistent, so that the mesh cloth of the connection hole 1.1 can be fixed. This structure of the connection end 2.1 can reduce the volume of the cavity, so that the particle flow material can better contact with the filter screen 1 before solidification, avoiding virtual connection, thereby improving the bonding strength after solidification.

[0024] In order to improve the bonding strength between the connection end 2.1 and the filter screen 1, as a preferred example, the radial dimension D1 of the upper notch 2.1c and the lower notch 2.1d is not less than half of the radial dimension D2 of the connection portion between the filter screen 1 and the connection end 2.1.

[0025] As a preferred example, lower fillets 2.1f2.1e are provided between the outer circumference of the upper tooth portion 2.1a and the sides of the upper notches 2.1c on both sides thereof, and lower fillets 2.1f are provided between the outer circumference of the lower tooth portion 2.1b and the sides of the lower notches 2.1d on both sides thereof. The fillet structure can reduce the material used in the injection molded part 2 and reduce the manufacturing cost.

[0026] As a preferred example, a connection fillet 2.1g is provided at the connection between the connection end 2.1 of the injection molded part 2 and its body 2.2. The connection fillet 2.1g can avoid stress concentration at the connection and prevent fracture.

[0027] The connection end and the filter screen were separated by a fabric tensile test machine, and the test separation speed was set to 100 mm / min. Then, the bonding separation force values ​​(N) before and after the improvement were quantitatively analyzed and studied. The test data are shown in the following table:

[0028] ;

[0029] It can be seen that after improvement, the bonding separation force value is increased by at least 50%, and the maximum can be close to 80%.

[0030] Embodiment 2: as Figure 6 As shown, the present invention also provides a mold, including an upper mold core 3 and a lower mold core 4, wherein the upper mold core 3 has an upper cavity 3.1, and the lower mold core 4 has a lower cavity 4.1. After the upper mold core 3 and the lower mold core 4 are molded together, the upper cavity 3.1 and the lower cavity 4.1 form an injection cavity for the injection molded part 2 in the first embodiment. Due to the slotted design of the connection end 2.1, there must be a protruding entity structure on the corresponding upper mold core 3 and the lower mold core 4. In this way, the entity structure will squeeze the filter screen 1 during injection molding, playing a positioning role. At this time, when the particle flow enters the injection cavity and acts on the filter screen 1, it is difficult to cause the filter screen 1 to deviate, thereby further improving the bonding strength between the connection end 2.1 and the filter screen 1 and improving the product yield.

[0031] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

[0032] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified and replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A structure for enhancing the bonding strength between an injection molded part and a filter screen, wherein the filter screen has a connection hole, and a connection end of the injection molded part is formed and connected to the connection hole, characterized in that: The portion of the connection end located above the filter screen is provided with a plurality of upper notches to form a plurality of upper teeth, and the portion of the connection end located below the filter screen is provided with a plurality of lower notches staggered with the upper notches to form a plurality of lower teeth, the upper teeth cover the lower notches below them, and the lower teeth cover the upper notches above them.

2. A structure for enhancing the bonding strength between an injection molded part and a filter screen according to claim 1, characterized in that: The radial dimensions of the upper notch and the lower notch are not less than half of the radial dimension of the connection portion between the filter screen and the connection end.

3. A structure for enhancing the bonding strength between an injection molded part and a filter screen according to claim 1, characterized in that: An upper fillet is provided between the outer circumferential surface of the upper tooth portion and the side surfaces of the upper notches on both sides thereof, and a lower fillet is provided between the outer circumferential surface of the lower tooth portion and the side surfaces of the lower notches on both sides thereof.

4. The structure for enhancing the bonding strength between an injection molded part and a filter screen according to claim 1, characterized in that: A connection fillet is provided at the connection point between the connection end of the injection molded part and its body.

5. A filter, comprising an injection molded part and a filter screen, characterized in that: The injection molded part and the filter screen are connected by a structure for enhancing the bonding strength between the injection molded part and the filter screen as described in claim 1.

6. A mold, comprising an upper mold core and a lower mold core, characterized in that: The upper mold core has an upper mold cavity, and the lower mold core has a lower mold cavity. After the upper mold core and the lower mold core are molded together, the upper mold cavity and the lower mold cavity form an injection cavity for injecting the injection molded part in the filter as claimed in claim 5.

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