CN108312550B

CN108312550B - Hot melt joint capable of being positioned rapidly and water-soluble core injection molding process thereof

Info

Publication number: CN108312550B
Application number: CN201810393988.0A
Authority: CN
Inventors: 陈友苗; 陈奎宏
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-04-27
Filing date: 2018-04-27
Publication date: 2023-07-21
Anticipated expiration: 2038-04-27
Also published as: CN108312550A

Abstract

The invention belongs to the technical field of pipe fitting plastics, and particularly relates to a hot-melt joint capable of being positioned quickly and a water-soluble core injection molding process thereof. The hot melt pipe comprises a joint main body provided with at least one mounting end, wherein a mounting position is arranged on the inner wall of the joint main body, a guide core is arranged on the mounting position, the outer side wall of the guide core is a guide surface, a hot melt guide part matched with the wall thickness of the hot melt pipe is formed between the guide surface and the inner wall of the mounting end, and the outer end of the hot melt guide part is provided with a guide opening. The guide core of the present invention has the following functions: a, when heating, inclination or unilateral heating can be prevented; and b, keeping the pipeline and the joint in a straight line during heat welding, so that the annular welding surfaces are uniformly welded, and the phenomenon of unilateral welding is avoided. The injection molding process is mainly applied to the plastic industry, and mainly aims at plastic products which have complex inner cavities, have larger inner cavities than outer openings and are not suitable for demolding treatment of inner cores.

Description

Hot melt joint capable of being positioned rapidly and water-soluble core injection molding process thereof

Technical Field

The invention belongs to the technical field of plastic pipe fittings, and particularly relates to a hot-melt joint capable of being positioned quickly and a water-soluble core injection molding process thereof.

Background

The hot melt connection (hereinafter referred to as fusion) is widely applied to connection of novel pipes such as PP-R pipes, PB pipes, PE-RT pipes, metal composite pipes, curved spring vector aluminum alloy plastic-lined composite pipe systems and the like with pipe fittings, and is a connection mode after heating to a liquid melting point. In the conventional welding process, the following problems easily occur if the experience of the operator is insufficient:

1. when the hot-melting machine is used for heating, the hot-melting part can be heated obliquely or unilaterally, so that the defects of oblique installation, insufficient sealing performance and the like of the water pipe are easily caused.

2. When the hot melting machine is used for heating, workers with insufficient experience shake hands easily, the welding position is overlarge, the welding leakage after extrusion is easy to occur, and the problems of liquid leakage and the like are solved.

3. Traditional hot melt joint does not have limit structure, is difficult to control the welding position degree of depth: too long wastes time and cost; too short results in less problems such as insufficient strength and poor sealing property.

4. After welding, the molten plastic is easily solidified on the inner wall of the water pipe, resulting in a reduction in the flow passage cross section, affecting normal pipeline use.

Disclosure of Invention

The invention aims to provide a hot-melt joint which has a simple structure and can be used for rapidly and accurately positioning hot-melt installation.

The purpose of the invention is realized in the following way:

the utility model provides a hot melt joint that can fix a position fast, is including the joint main part that is provided with at least one installation end, be provided with the installation position on the joint main part inner wall, be provided with the direction core on the installation position, the lateral wall of direction core is the guide surface, and the shaping has the hot melt guide part with hot melt pipe wall thickness looks adaptation between guide surface and the installation end inner wall, hot melt guide part outer end sets up the direction and uncovered.

Preferably, a hot melt pipe limiting part and a hot melt filling groove are formed at the bottom end of the hot melt guiding part.

Preferably, a hot-melt flow-limiting ring groove is formed on the end face of the mounting end.

Preferably, the outer end surface of the guide core is formed with a saw-tooth structure.

Preferably, the fixed mounting portion of the guide core is provided with threads or knurling teeth or burrs, which are fixed on the mounting location.

Preferably, the guide core is a water-soluble guide core, and the components thereof are: 58-70 parts of sugar, 5-15 parts of fiber and 25-40 parts of starch.

Preferably, the guide core is a metal tube guide core, and the hot melt tube limiting part is a limiting convex ring.

Preferably, the mounting position of the metal pipe guide core is provided with an insert connecting tooth or an insert mounting hole, and is integrally formed in the joint main body.

An injection molding process of a water-soluble core, comprising the steps of:

(1) Raw material selection: 58-70 parts of sugar, 5-15 parts of fiber and 25-40 parts of starch;

(2) And (3) primary pulp preparation: continuously stirring and melting all the powdery raw materials to a uniform dissolution state at 170-200 ℃;

(3) And (3) preparing a water-soluble core: injecting the primary pulp into an injection mold for manufacturing a water-soluble core, and cooling to form the water-soluble core;

(4) And (3) manufacturing a product: placing the water-soluble core into an injection mold for manufacturing a product, and injecting and cooling the product with the water-soluble core;

(5) Dissolution water dissolution core: and (3) putting the product with the water dissolving core into water for dissolving.

Preferably, 5-10 parts of sodium chloride can be added in the raw material selection.

Compared with the prior art, the invention has the following outstanding and beneficial technical effects:

1. the guide core of the present invention has the following functions:

and (a) can prevent inclination or unilateral heating during heating, so that the guide core can keep annular vertical uniform heating.

And b, keeping the pipeline and the joint in a straight line during heat welding, so that the annular welding surfaces are uniformly welded, and the phenomenon of unilateral welding is avoided.

The hot melting pipe limiting part has a limiting function and can not be welded.

And d, the welding leakage after the hands shake and squeeze can be completely prevented, and the water leakage phenomenon and hidden danger of water leakage are not easy to cause.

The hot melt filling groove of the invention limits the hot melt material from overflowing and plays a role of not reducing the pipe diameter.

2. The inner diameter of the water dissolution guide core is as large as that of a common joint, and the water dissolution guide core can be slowly dissolved under the scouring of water flow in the use process after fusion molding, so that the flow passage area is ensured, and the water dissolution guide core becomes a full-path pipeline. Wherein the material for limiting the thermal dissolution is not overflowed, and the redundant dissolution substances are limited to be inclined under the action of the inclined thermal melting filling groove, so that the water flow is smoother.

3. The metal guide core is a sub-option, and has the advantages of easy material collection, mature process, convenient manufacture and the like.

4. The injection molding process is mainly applied to the plastic industry, and mainly aims at plastic products which have complex inner cavities, larger inner cavities than outer openings and are not suitable for demolding treatment of inner cores, in particular to plastic products such as plastic valve bodies, plastic pipe joints, plastic kettles, pump bodies of plastic water pumps and the like. The plastic product produced by the process can be integrally formed into a complex inner cavity, the inner core is not required to be demolded, the manufacturing cost is low, and the water-soluble core can be easily removed by water flushing.

Drawings

FIG. 1 is a schematic view showing the structure of a built-in integrated water-soluble guide core according to a first embodiment of the present invention.

Fig. 2 is a cross-sectional view at A-A in fig. 1.

FIG. 3 is a schematic view showing the structure of a built-in split type water-soluble guide core according to a second embodiment of the present invention.

FIG. 4 is a schematic view showing the structure of a built-in large and small head type water-soluble guide core according to a third embodiment of the present invention.

FIG. 5 is a schematic view of a structure of a built-in three-way in-line water dissolution guide core according to a fourth embodiment of the present invention.

FIG. 6 is a schematic view showing the structure of a water-soluble guide core with a built-in loose joint according to a fifth embodiment of the present invention.

Fig. 7 is a schematic structural view of a built-in integral metal guide core according to a sixth embodiment of the present invention.

Fig. 8 is a schematic structural view of a tee fitting incorporating a split metal guide core according to a seventh embodiment of the present invention.

Fig. 9 is a schematic structural view of a split metal guide core of the present invention.

Fig. 10 is a schematic view showing the structure of a built-in metal guide core and an insert according to an eighth embodiment of the present invention.

Fig. 11 is a schematic structural view of a built-in integrated guide core and insert according to a ninth embodiment of the present invention.

Fig. 12 is a cross-sectional view at B-B in fig. 11.

Fig. 13 is a schematic view showing a structure of a built-in integrated guide core and an insert according to a tenth embodiment of the present invention.

Fig. 14 is a cross-sectional view at C-C in fig. 13.

FIG. 15 is a schematic view of a tube-in-tube structure of a two-way tube according to an eleventh embodiment of the present invention.

Fig. 16 is a schematic view of a tube-in-tube structure of a tee according to a twelfth embodiment of the present invention.

Fig. 17 is a schematic structural view of an elbow joint with a split metal guide core built in according to a thirteenth embodiment of the present invention.

Fig. 18 is a schematic view of the structure of the water-soluble core injection molding process of the present invention applied to the bridge head.

The meaning indicated by the reference numerals in the figures:

1-a joint body; 2-a guide core; 3-a hot melt guide; 4-inserts; 5-water-soluble core; 6-product; 7-a fluid channel;

11-mounting position; 12-a hot melt flow-limiting ring groove;

21-a guide surface; 22-insert connection teeth; 23-insert mounting holes; 24-reinforcing ribs;

30-guiding the opening; 31-a hot melt pipe limiting part; 32-hot melt filling the groove.

Detailed Description

The invention is further described with reference to the following specific examples:

basic examples:

as shown in fig. 1-2: the invention relates to a quick positioning hot-melt joint, which comprises a joint main body 1 provided with at least one mounting end, wherein a mounting position 11 is arranged on the inner wall of the joint main body 1, a guide core 2 is arranged on the mounting position 11, the outer side wall of the guide core 2 is a guide surface 21, a hot-melt guide part 3 which is matched with the wall thickness of a hot-melt pipe is formed between the guide surface 21 and the inner wall of the mounting end, a guide opening 30 is arranged at the outer end of the hot-melt guide part 3, and the guide opening 30 consists of a chamfer of the guide core 2 and a chamfer of the mounting end.

The guide core of the present invention has the following functions:

In a word, the problems are solved by the method, namely the biggest pain point in the industry is solved, the safety of the joint is greatly improved, and the operation of common workers can reach and exceed the level of a professional master.

Preferably, the inner end of the hot melt guiding part 3 is formed with a hot melt pipe limiting part 31 for limiting the pipe position and a hot melt filling groove 32 for filling the surplus digestion.

Preferably, a hot-melt flow-limiting ring groove 12 is formed on the end surface of the mounting end, and the hot-melt flow-limiting ring groove 12 is used for shaping the shape of superfluous dissolution of the joint, so that the strength and the tightness of the joint are improved.

Preferably, the guide core 2 is a solid annular structure or an annular structure formed by a plurality of sheets.

Preferably, the outer end surface of the guide core 2 is formed with a saw-tooth structure, so that the contact area is reduced, friction during pipe fitting insertion is reduced, and meanwhile, the strength of a pipeline is increased.

In addition, when the joint of the invention is hot melted by a hot melting machine, the heating core of the hot melting machine is not contacted with the guiding core of the invention, so that the guiding precision of the guiding surface 21 is prevented from being influenced by the thermal deformation of the guiding core.

Example 1

As shown in fig. 1-2, the scheme of the basic embodiment of this embodiment is further provided with: the guide core 2 is a water-soluble guide core, and comprises the following components: 58-70 parts of sugar, 5-15 parts of fiber and 25-40 parts of starch. The inner diameter of the water dissolution guide core is as large as that of a common joint, and the water dissolution guide core can be slowly dissolved under the scouring of water flow in the use process after fusion molding, so that the flow passage area is ensured, and the water dissolution guide core becomes a full-path pipeline.

Preferably, the inner end of the hot melt guiding portion 3 is formed with a hot melt pipe limiting portion 31 for limiting the position of the pipe fitting and a hot melt filling groove 32 for filling the redundant dissolution product, in the embodiment of the water dissolution guiding core, the hot melt pipe limiting portion 31 is in a step structure, the hot melt filling groove 32 is an inclined slope, when the water dissolution guiding core is dissolved under the flushing of water flow, the redundant dissolution product is limited to be in an inclined shape, so that the water flow is smoother, meanwhile, the shape of the redundant dissolution product of the pipe fitting is shaped, and the strength and the sealing performance of the connecting position are increased.

Preferably, the water-soluble guide core may be inserted during injection molding, or may be installed after using an adhesive.

Example two

As shown in fig. 3, this embodiment is substantially the same as the first embodiment, except that: the connector is characterized in that two mounting ends are coaxially arranged on the connector body 1, two guide cores 2 with the same structure are reversely arranged on the mounting position 11, embossing is arranged on the outer side wall of the inner end of each guide core 2, and the strength of the fixing position is improved. The method of the embodiment is convenient to process and low in manufacturing cost.

Example III

As shown in fig. 4, this embodiment is substantially the same as the first embodiment, except that: the joint main body 1 is provided with two mounting ends, and the apertures of the mounting ends are different, commonly called as a big-small joint.

Example IV

As shown in fig. 5, this embodiment is substantially the same as the first embodiment, except that: the joint main body 1 is provided with three mounting ends commonly called as a tee joint, wherein one mounting end is provided with internal threads or external threads through an embedded piece 4. By analogy, the present embodiment may also be designed as a "four-way" or a "five-way" embodiment.

Example five

As shown in fig. 6, this embodiment is substantially the same as the first embodiment, except that: the connector body 1 is provided with two mounting ends, one of which is provided with a water dissolution guide core, and the other end is provided with a mounting protrusion, and the connector body is fixed by a nut in a manner commonly called 'loose joint'.

Example six:

as shown in fig. 7, this embodiment is substantially the same as the first embodiment, except that: the guide core 2 is a metal tube guide core, and the hot melt tube limiting part 31 is a limiting convex ring. In the environment with poor water quality, a layer of high-temperature resistant plastic coating is sprayed on the surface of the metal guide core, so that the service life is ensured.

Preferably, the metal pipe guide core 2 is formed with an insert mounting hole 23 at a mounting position and integrally formed in the joint body 1.

Preferably, a plurality of reinforcing protrusions are formed on the side wall of the metal pipe guide core, for increasing strength and reducing contact area with the pipe.

Preferably, the side wall of the metal pipe guide core is provided with a plurality of reinforcing ribs 24 for increasing the strength of the pipe.

Embodiment seven:

as shown in fig. 17, this embodiment is substantially the same as the sixth embodiment, except that: the metal tube guiding core is sequentially provided with a guiding surface, a hot-melting tube limiting part 31, a hot-melting filling groove 32 and a fixed mounting part, and the fixed mounting part is provided with threads or knurling teeth or burrs. The metal tube guide core is fixed in a threaded connection mode, and has the advantages that: convenient assembly, firm fixation and low manufacturing cost. The sub-scheme is that the knurling teeth or burrs are directly tightly pressed into the mounting positions 11, so that the assembly is easy.

Example eight:

as shown in fig. 8 to 9, this embodiment is substantially the same as the sixth embodiment, except that: the mounting position of the metal pipe guide core 2 is provided with an insert connecting tooth 22, and is integrally formed in the joint main body 1.

Example nine:

as shown in fig. 10, this embodiment is substantially the same as the sixth embodiment, except that: the joint main body 1 is provided with at least two mounting ends, one of the mounting ends is provided with a metal pipe guide core, and the other end is provided with internal threads or external threads through the embedded piece 4.

Example ten:

as shown in fig. 13 to 14, the present embodiment is further provided with, in the scheme of the base embodiment: the guide core 2 is integrally formed inside the mounting end, and the guide core 2 is of an annular structure formed by a plurality of sheet bodies. At least three or more sheets can be positioned and guided, and four sheets are better to open the die. The sheet body has certain obstruction to water flow, can be applied when the pipeline is relatively short, and is relatively convenient to manufacture.

Example eleven:

as shown in fig. 11-12, the scheme of the basic embodiment of this embodiment is further provided with: the connector body 1 is provided with at least two mounting ends, wherein one mounting end is provided with an integrally formed annular guide core 2, and the other end is provided with internal threads or external threads through an embedded piece 4. The pipe diameter of the joint is reduced more, so that the joint has a certain obstruction to water flow, and the joint can be applied when a pipeline is shorter. Because the pipeline water outlet joint has low requirement on pipeline, the joint is most suitable for the application of the water outlet joint. In addition, the joint is convenient to manufacture as common joints.

Embodiment twelve:

as shown in fig. 15, which is a tube-in-tube hot melt joint for connecting a tube-in-tube. The pipe-in-pipe refers to a pipe type in which an inner pipe is coaxially arranged inside an outer pipe, namely, two independent flow passages are arranged in the same pipe. In the pipe-in-pipe hot melt joint, the end part of the joint inner pipe connected with the pipe-in-pipe inner pipe is equivalent to a guide core, and the outer wall of the joint inner pipe is also provided with a limiting part which plays a role in rapidly positioning the pipe-in-pipe inner pipe; the joint body of the tube-in-tube hot melt joint melts the side wall of the tube-in-tube outer tube. After the pipe is installed, an outer flow passage matched with the outer pipe of the pipe in the pipe is formed between the inner pipe of the joint and the main body of the joint, and an inner flow passage is formed between the inner pipe of the joint and the inner pipe of the pipe in the pipe.

Embodiment thirteen:

as shown in fig. 16, this embodiment is substantially the same as the tenth embodiment, except that: the pipe-in-pipe hot melt joint is three-way, and the installation end of the pipe-in-pipe hot melt joint is provided with internal threads or external threads through the inner insert 4.

Through the research and development of the water-soluble guide core, the invention develops an injection molding process for producing the water-soluble core, which is mainly applied to the plastic industry and mainly aims at plastic products with complex inner cavities, larger inner cavities than outer openings and unsuitable for demolding treatment of inner cores, in particular plastic products such as plastic valve bodies, plastic pipe joints, plastic kettles, pump bodies of plastic water pumps and the like, and the bridge joint is shown in figure 17. The plastic product produced by the process can be integrally formed into a complex inner cavity, the inner core is not required to be demolded, the manufacturing cost is low, and the water-soluble core can be easily removed by water flushing.

An injection molding process of a water-soluble core, comprising the steps of:

the water-soluble core is preferably a sugar core, the sugar core is easy to manufacture, the performance is almost the same as that of plastics, the dissolution temperature is almost the same, and the water-soluble core has plasticity. In addition, the sugar can be recycled, is environment-friendly and harmless, and has high material cost performance.

The fibers are food-grade bamboo fibers, tapioca fibers and the like, and are used for increasing the strength; glass fiber can also be used, so that the glass fiber can be reused conveniently.

Starch is used to resist sugar crystallization, change the properties of sugar, and increase toughness and plasticity.

(2) And (3) primary pulp preparation: continuously stirring and melting all the powdery raw materials to a uniform dissolution state at 170-200 ℃; preferably, the dissolution effect is optimal when the temperature is controlled between 180 ℃ and 190 ℃.

(4) And (3) manufacturing a product: placing the water-soluble core into an injection mold for manufacturing the product 6, and injecting and cooling the product 6 with the water-soluble core;

(5) Dissolution water dissolution core: the product 6 with the water-soluble core is put into water for dissolution.

Preferably, 5-10 parts of sodium chloride can be added in the raw material selection, and the sodium chloride has an antibacterial effect.

Preferably, the water-soluble core is coated with a layer of gelatin, which acts as a moisture barrier.

Preferably, a fluid channel 7 is provided inside the water-dissolving core as shown to facilitate the flow and dissolution of water.

The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention in this way, therefore: all equivalent changes in structure, shape and principle of the invention should be covered in the scope of protection of the invention.

Claims

1. The utility model provides a hot melt joint that can fix a position fast, is including being provided with joint main part (1) of at least one installation end, its characterized in that: the hot melt pipe connector is characterized in that an installation position (11) is arranged on the inner wall of the connector main body (1), a guide core (2) is arranged on the installation position (11), the outer side wall of the guide core (2) is a guide surface (21), a hot melt guide part (3) which is matched with the wall thickness of a hot melt pipe is formed between the guide surface (21) and the inner wall of the installation end, and a guide opening (30) is formed in the outer end of the hot melt guide part (3);

a hot melt pipe limiting part (31) and a hot melt filling groove (32) are formed at the inner end of the hot melt guiding part (3);

the guide core (2) is a water-soluble guide core, and comprises the following components: 58-70 parts of sugar, 5-15 parts of fiber and 25-40 parts of starch.

2. A quick positionable hot melt joint according to claim 1, wherein: the end face of the mounting end is provided with a hot-melt flow-limiting ring groove (12).

3. A quick positionable hot melt joint according to claim 2, wherein: the guide core (2) is of a solid annular structure or an annular structure formed by a plurality of sheet bodies.

4. A quick locatable hot melt connector as defined in claim 1 or 3 wherein: the fixed installation part of the guide core (2) is provided with threads or knurling teeth or burrs, and the fixed installation part is fixedly arranged on the installation position (11).

5. An injection molding process for a water-soluble core is characterized in that: the method comprises the following steps:

(4) And (3) manufacturing a product: placing the water-soluble core into an injection mold for manufacturing a product, and injecting and cooling to form a product (6) with the water-soluble core, wherein the product (6) is a hot melt joint capable of being rapidly positioned according to any one of claims 1-4;

(5) Dissolution water dissolution core: the product (6) with the water-soluble core is put into water for dissolution.

6. The water soluble core injection molding process of claim 5, wherein: 5-10 parts of sodium chloride can be added in the raw material selection.

7. The water soluble core injection molding process of claim 5, wherein: the water-soluble core is wrapped with a layer of gelatin.