Hot melting connecting pipe fitting, pipe connecting assembly and hot melting equipment

Abstract

The utility model relates to a hot melting connecting pipe fitting which comprises a plurality of connecting ends and bonding layers arranged in the connecting ends, the pipe fitting and a pipe are bonded after the bonding layers are melted, and the melting point of the bonding layers is lower than that of the connecting ends. The utility model further comprises a pipe connecting assembly and hot melting equipment. The bonding layer is arranged in the connecting end, during bonding work, the bonding layer is heated to be molten, then the connecting end and the pipe are bonded together through the molten bonding layer, use of solvent type glue is avoided, health of operators is protected, meanwhile, the thickness of the bonding layer can be controlled in a standardized mode, and the service life of the connecting end and the pipe is prolonged. And the heating temperature and the heating time of the bonding layer are controlled in a normative manner, so that the bonding work is normative, and when different operators carry out pipe bonding work, the stable bonding effect can be achieved through the normative operation, the bonding quality of the pipe is ensured, and the probability of water leakage of the pipe is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline connection, and more specifically, to a hot-melt connection pipe fitting, a pipe connection assembly and a hot-melt device. Background Art

[0002] PVC plastic pipe system is one of the main pipes used in modern urban drainage systems. Its connection method mainly adopts PVC pipe fittings for connection. Generally, solvent-based glue is used to bond PVC pipes. This method is greatly affected by the operator's operation skills. Generally, solvent-based glue is used to bond PVC pipe fittings and PVC pipes together to form a complete PVC pipe system. The operation method is generally that the installer manually applies glue on site for connection operation. The connection quality depends entirely on whether the operator's technique is proficient and the quality of the glue itself. The connection effects of different operators vary greatly, which is difficult to standardize. The connection quality is difficult to guarantee, and it is easy to have poor pipe connection and the risk of pipe leakage. Moreover, many components in solvent-based glue are toxic and harmful volatile components. The odor in the connected pipe cannot be eliminated for a long time, which has a potential impact on people's health, especially for operators. They are exposed to solvent-based glue for a long time, and the impact of glue volatile substances on health cannot be ignored.

[0003] In the prior art, there is a hot-melt welding pipeline connection solution, which requires heating and melting the inner wall of the pipe fitting and the outer wall of the pipe material, and plugging and bonding the pipe fitting and the pipe material together when the surface is molten. This solution is relatively cumbersome in operation, and it is also necessary to ensure that the surfaces of the pipe fitting and the pipe material are in a molten state during plugging, and the connection quality is also difficult to control. In addition, there is an electric fusion welding pipeline connection solution, which requires setting an electric fuse in the pipe fitting, heating the electric fuse to melt the pipe fitting and the pipe material, and then achieving bonding. The connection quality of this solution is relatively stable, but the manufacturing cost of the pipe fitting is high, and it is not applicable in many scenarios. Utility Model Content

[0004] The utility model aims to overcome the defects in the above-mentioned prior art that hot-melt pipe welding is mainly performed by plugging the pipe and the pipe fitting surface in a molten state, which is troublesome to operate and the connection quality is also difficult to control. A hot-melt connecting pipe fitting, a pipe connecting assembly and a hot-melt device are provided. The pipe and the pipe fitting are first plugged together, and then a specific part of the pipe fitting is heated and melted to achieve the bonding of the pipe fitting and the pipe, thereby ensuring the bonding quality.

[0005] To solve the above technical problems, the technical solution adopted by the utility model is: a hot-melt connecting pipe, comprising: a plurality of connecting ends and an adhesive layer arranged in the connecting ends, wherein the melting point of the adhesive layer is lower than the melting point of the connecting ends.

[0006] The connecting end refers to the connecting part of the pipe fitting. The number of connecting ends of different pipe fittings is also different, generally two or three, corresponding to two-way pipe fittings and three-way pipe fittings; specifically, the adhesive layer connected to the connecting end is solid at room temperature, and has viscosity after melting. The adhesive layer is set in the connecting end of the pipe fitting as an adhesive material. At the same time, there are many ways to connect the adhesive layer and the connecting end. The adhesive layer can be set as a cylindrical piece and then inserted into the connecting end, or the adhesive layer and the connecting end can be set integrally, etc. Connecting ends of different pipe diameters are connected to adhesive layers of different thicknesses, and connecting ends of the same pipe diameter are connected to adhesive layers of the same thickness. When performing melt bonding, the heating temperature and heating time are controlled in a standardized manner. , so that the bonding quality of the pipe is better guaranteed, the pipeline connection effect is also relatively stable, and the probability of pipe leakage is reduced. At the same time, no solvent-based glue is needed during the bonding process, which also protects the health of the operators; when connecting the pipe, the pipe is inserted into the connecting end, at this time the bonding layer is located between the pipe and the connecting end, and then the heating equipment is used to melt the bonding layer, and then the pipe and the pipe fitting are connected together, wherein the melting point of the bonding layer is lower than the melting point of the connecting end and the pipe, when the bonding layer melts, the connecting end and the pipe structure itself can still remain stable, at the same time, the pipe fitting is more suitable for connecting plastic pipe fittings, and the bonding layer adopts a material similar to and compatible with the pipe fitting; further, the material of the bonding layer is EVA. Among the existing materials, EVA, EAA and similar polymers with lower melting points than pipes can meet the use requirements of the adhesive layer. The melting point of EVA is about 80℃-110℃, and the melting point of EAA is about 70℃-90℃. Among them, the melting point of EVA is close to the softening point of PVC, and PVC pipes are the most widely used pipes. When EVA is heated and melted, PVC is softened, so that EVA and PVC can be fully fused together, and the bonding effect is better, so EVA material is preferred.

[0007] Preferably, the adhesive layer is a composite layer of the connecting end.

[0008] The bonding layer is configured as a composite layer, so that the connection between the bonding layer and the connection is more stable, and dust or other impurities between the bonding layer and the connection end are avoided, which may affect the bonding effect.

[0009] Preferably, a groove portion is provided on the inner side surface of the connecting end, and a convex strip portion matching with the groove portion is provided on the adhesive layer.

[0010] The groove part and the convex strip part which cooperate with each other are arranged to make the connection between the adhesive layer and the connection end more stable.

[0011] Preferably, the groove portion comprises a bottom surface, a first inclined surface and a second inclined surface, and the angles between the first inclined surface and the second inclined surface and the bottom surface are both obtuse angles.

[0012] The groove portion includes a first inclined surface and a second inclined surface, and the convex strip portion is also provided with an inclined surface that fits therewith. At the same time, the angles between the first inclined surface and the second inclined surface and the bottom surface are both obtuse angles. The first inclined surface and the second inclined surface face the surface of the pipe. When the adhesive layer expands due to heat, it will be squeezed toward the surface of the pipe under the action of the first inclined surface and the second inclined surface, so that the connection between the adhesive layer and the pipe is tighter, further enhancing the bonding effect.

[0013] Preferably, a retaining ring connected to the adhesive layer is provided at the end of the connecting end.

[0014] A retaining ring is provided to block the adhesive layer. When the adhesive layer expands due to heat, the retaining ring blocks the adhesive layer between the connection end and the pipe, and utilizes the pressure of the expansion of the adhesive layer to further enhance the bonding effect. At the same time, the retaining ring may completely cover the side of the adhesive layer or may not completely cover it, depending on the specific situation.

[0015] Preferably, a protrusion is provided on the surface of the adhesive layer.

[0016] In actual use, the inner diameter of the pipe fitting is consistent with the outer diameter of the pipe. When the pipes are connected, the friction is relatively large. Providing a raised portion can reduce the friction between the adhesive layer and the pipe, making the connection easier. At the same time, the volume of the raised portion is smaller than the overall volume of the adhesive layer. When heating and bonding are performed, the raised portion will be melted first, and can also play a role of pre-bonding during the bonding process, thereby improving the bonding effect. At the same time, the shape of the raised portion is not limited, and can be set to mesh stripes, annular stripes, or stripe stripes, etc.

[0017] Preferably, it further comprises a limiting portion arranged in the connecting end, the adhesive layer is connected to a side surface of the limiting portion, and the inner diameter of the limiting portion is smaller than the inner diameter of the adhesive layer.

[0018] In the prior art, many pipe fittings are provided with a limiting portion inside to limit the end of the pipe. In this solution, the material of the limiting portion is consistent with that of the pipe fitting body, and the bonding portion is arranged on the side of the limiting portion to prevent the limiting portion from melting during heating.

[0019] A pipe connection assembly comprises a pipe and the above-mentioned hot-melt connection pipe fitting, wherein the outer diameter of the pipe is not less than the inner diameter of the bonding layer, and the pipe and the hot-melt connection pipe fitting are bonded after the bonding layer is melted.

[0020] In the pipe connection assembly, the outer diameter of the pipe is not less than the inner diameter of the bonding layer to ensure a stable connection. At the same time, the material of the pipe fitting is consistent with the pipe, for example, both are made of PVC.

[0021] A hot melt device comprises: a control component, and a first infrared heating head and a second infrared heating head respectively connected to the control component, wherein the first infrared heating head and the second infrared heating head are used to heat the above-mentioned hot melt connecting pipe.

[0022] In hot-melt connecting pipe fittings, when bonding is performed, the bonding layer is located between the connecting end and the pipe, and contact heating cannot be used. This solution uses hot-melt equipment with infrared heating function to bond the bonding layer, wherein the first infrared heating head and the second infrared heating head are heating components to heat the bonding layer, and the control component is used to control the heating temperature of the first infrared heating head and the second infrared heating head. Furthermore, when the bonding layer in the pipe fitting is made of EVA material, the heating temperature of the first infrared heating head and the second infrared heating head is set between 140°C and 165°C.

[0023] Preferably, both the first infrared heating head and the second infrared heating head are provided with an arc-shaped heating portion.

[0024] The first infrared heating head and the second infrared heating head are provided with arc-shaped heating parts. When heating, the pipe and the pipe fitting are located between the arc-shaped heating parts, so that the heat can be transferred to the bonding layer more evenly, thereby ensuring the heating effect.

[0025] Compared with the prior art, the utility model has the following beneficial effects:

[0026] An adhesive layer is provided in the connection end. When the bonding work is performed, the adhesive layer is heated to melt it, and the connection end and the pipe are bonded together using the melted adhesive layer, thereby avoiding the use of solvent-based glue and protecting the health of the operators. At the same time, the thickness of the adhesive layer can be standardized, and then the heating temperature and heating time of the adhesive layer are controlled in a standardized manner, so that the bonding work is standardized, so that different operators can achieve stable bonding effects through standardized operations when performing pipe bonding work, thereby ensuring the bonding quality of the pipe and reducing the probability of pipe leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of a first connection structure of a pipe connection assembly of the utility model;

[0028] Figure 2 This is a schematic diagram of a second connection structure of a pipe connection assembly of the utility model;

[0029] Figure 3 This is a schematic diagram of the connection structure of a pipe connection assembly of the utility model from another angle;

[0030] Figure 4 yes Figure 3 A magnified schematic diagram of part A;

[0031] Figure 5 The invention is a working diagram of a hot melt connection device heating a hot melt connection pipe fitting.

[0032] In the figure: 1, connecting end; 101, retaining ring; 2, adhesive layer; 3, groove portion; 301, bottom surface; 302, first inclined surface; 303, second inclined surface; 4, convex strip portion; 5, raised portion; 6, limiting portion; 7, control component; 8, first infrared heating head; 9, second infrared heating head; 10, arc heating portion; 11, pipe. DETAILED DESCRIPTION

[0033] The drawings are only for illustrative purposes and cannot be construed as limiting the present invention. To better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are only for illustrative purposes and cannot be construed as limiting the present invention.

[0034] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "long", "short" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0035] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0036] Example 1

[0037] like Figure 1 As shown, a hot-melt connecting pipe comprises: a plurality of connecting ends 1 and an adhesive layer 2 arranged in the connecting ends 1 , wherein the melting point of the adhesive layer 2 is lower than the melting point of the connecting ends 1 .

[0038] The connection end 1 refers to the connection part of the pipe fitting. The number of connection ends 1 of different pipe fittings is also different, generally two or three, corresponding to two-way pipe fittings and three-way pipe fittings; specifically, the adhesive layer 2 connected to the connection end 1 is solid at room temperature, and has viscosity after melting. The adhesive layer 2 is set in the connection end 1 of the pipe fitting as an adhesive material. At the same time, there are many ways to connect the adhesive layer 2 and the connection end 1. The adhesive layer 2 can be set as a cylindrical piece and then inserted into the connection end 1, or the adhesive layer 2 can be set integrally with the connection end 1, etc. Connection ends 1 of different pipe diameters are connected to adhesive layers 2 of different thicknesses, and connection ends 1 of the same pipe diameter are connected to adhesive layers 2 of the same thickness. When performing melt bonding, the pipe 1 is made to be tight by controlling the heating temperature and heating time in a standardized manner. The bonding quality of 1 is well guaranteed, the pipeline connection effect is relatively stable, and the probability of water leakage of the pipe 11 is reduced. At the same time, no solvent-based glue is needed during the bonding process, which also protects the health of the operator. When connecting the pipe 11, the pipe 11 is inserted into the connecting end 1. At this time, the bonding layer 2 is located between the pipe 11 and the connecting end 1. The heating equipment is then used to melt the bonding layer 2, and then the pipe 11 and the pipe fitting are connected together. Among them, the melting point of the bonding layer 2 is lower than the melting point of the connecting end 1 and the pipe 11. When the bonding layer 2 melts, the structure of the connecting end 1 and the pipe 11 itself can still remain stable. At the same time, the pipe fitting is more suitable for connecting plastic pipe fittings, and the bonding layer 2 adopts a material similar to and compatible with the pipe fitting; further, the material of the bonding layer 2 is EVA. Among the existing materials, EVA, EAA and similar polymers with a lower melting point than the pipe 11 can meet the use requirements of the adhesive layer 2. The melting point of EVA is approximately 80°C-110°C, and the melting point of EAA is approximately 70°C-90°C. Among them, the melting point of EVA is close to the softening point of PVC, and PVC pipe 11 is a more widely used pipe 11. When EVA is heated and melted, PVC is softened, so that EVA and PVC can be fully fused together, and the bonding effect is better, so EVA material is preferred.

[0039] The beneficial effects of this embodiment are as follows: an adhesive layer 2 is provided in the connection end 1. When the bonding work is performed, the adhesive layer 2 is heated to melt it, and the connection end 1 and the pipe 11 are bonded together using the melted adhesive layer 2, thereby avoiding the use of solvent-based glue and protecting the health of the operator. At the same time, the thickness of the adhesive layer 2 can be standardized, and then the heating temperature and heating time of the adhesive layer 2 are controlled in a standardized manner, so that the bonding work is standardized, so that different operators can achieve a stable bonding effect through standardized operations when performing the bonding work of the pipe 11, thereby ensuring the bonding quality of the pipe 11 and reducing the probability of water leakage of the pipe 11.

[0040] Example 2

[0041] like Figure 2-4As shown, based on Example 1, the difference from Example 1 is that:

[0042] The adhesive layer 2 is a composite layer of the connection end 1. A groove portion 3 is provided on the inner side surface of the connection end 1, and a convex strip portion 4 matching the groove portion 3 is provided on the adhesive layer 2. The groove portion 3 includes a bottom surface 301, a first inclined surface 302 and a second inclined surface 303, and the angles between the first inclined surface 302 and the second inclined surface 303 and the bottom surface 301 are both obtuse angles. A retaining ring 101 connected to the adhesive layer 2 is provided at the end of the connection end 1. A protrusion 5 is provided on the surface of the adhesive layer 2. It also includes a limiting portion 6 arranged in the connection end 1, and the adhesive layer 2 is connected to the side of the limiting portion 6, and the inner diameter of the limiting portion 6 is smaller than the inner diameter of the adhesive layer 2.

[0043] The adhesive layer 2 is set as a composite layer, so that the connection between the adhesive layer 2 and the connection is more stable, and dust or other impurities between the adhesive layer 2 and the connection end 1 can be avoided to affect the bonding effect. The groove part 3 and the convex strip part 4 that cooperate with each other are set to make the connection between the adhesive layer 2 and the connection end 1 more stable. The groove part 3 includes a first inclined surface 302 and a second inclined surface 303, and the convex strip part 4 is also provided with an inclined surface that fits therewith. At the same time, the angles between the first inclined surface 302 and the second inclined surface 303 and the bottom surface 301 are both obtuse angles. The first inclined surface 302 and the second inclined surface 303 face the surface of the pipe 11. When the adhesive layer 2 expands due to heat, it will be squeezed toward the surface of the pipe 11 under the action of the first inclined surface 302 and the second inclined surface 303, so that the connection between the adhesive layer 2 and the pipe 11 is tighter, and the bonding effect is further enhanced. The retaining ring 101 is provided to block the adhesive layer 2. When the adhesive layer 2 expands due to heat, the retaining ring 101 blocks the adhesive layer 2 between the connection end 1 and the pipe 11, and uses the pressure of the expansion of the adhesive layer 2 to further enhance the bonding effect. At the same time, the retaining ring 101 can completely cover the side of the adhesive layer 2, or it can not completely cover it, depending on the specific situation. In actual use, the inner diameter of the pipe fitting is consistent with the outer diameter of the pipe 11. When the pipe 11 is connected to the pipe fitting, the friction force is relatively large. The protrusion 5 can reduce the friction between the adhesive layer 2 and the pipe 11, and facilitate the connection. At the same time, the volume of the protrusion 5 is relatively small relative to the overall volume of the adhesive layer 2. When heating and bonding, the protrusion 5 will be melted first, and it can also play a role of pre-bonding in the bonding process to improve the bonding effect. At the same time, the shape of the protrusion 5 is not limited, and can be set to mesh stripes, ring stripes or stripes, etc. In the prior art, many pipe fittings are provided with a limiting portion 6 inside to limit the end of the pipe 11. In this solution, the material of the limiting portion 6 is consistent with the pipe fitting body, and the bonding portion is arranged on the side of the limiting portion 6 to prevent the limiting portion 6 from melting during heating.

[0044] The remaining features and working principles of this embodiment are consistent with those of Embodiment 1.

[0045] Example 3

[0046] like Figure 2-4 As shown, a pipe connection assembly includes a pipe 11 and the hot-melt connection pipe fitting in Example 1 or Example 2. The outer diameter of the pipe 11 is not less than the inner diameter of the adhesive layer 2. After the adhesive layer 2 is melted, the pipe 11 and the hot-melt connection pipe fitting are bonded.

[0047] In the pipe 11 connection assembly, the outer diameter of the pipe 11 is not less than the inner diameter of the adhesive layer 2 to ensure a stable connection. At the same time, the material of the pipe fitting is consistent with that of the pipe 11, for example, both are made of PVC.

[0048] Example 4

[0049] like Figure 5 As shown, a hot melt device includes: a control component 7, and a first infrared heating head 8 and a second infrared heating head 9 respectively connected to the control component 7, the first infrared heating head 8 and the second infrared heating head 9 are used to heat the hot melt connection pipe fittings in the above embodiment. The first infrared heating head 8 and the second infrared heating head 9 are both provided with an arc heating portion 10.

[0050] In the hot-melt connection pipe fittings, when the bonding work is performed, the bonding layer 2 is located between the connection end 1 and the pipe 11, and the contact heating setting cannot be used. This solution uses a hot-melt device with an infrared heating function to bond the bonding layer 2, wherein the first infrared heating head 8 and the second infrared heating head 9 are heating components to heat the bonding layer 2, and the control component 7 is used to control the heating temperature of the first infrared heating head 8 and the second infrared heating head 9. Further, when the bonding layer 2 in the pipe fitting is made of EVA material, the heating temperature of the first infrared heating head 8 and the second infrared heating head 9 is set between 140°C and 165°C. The first infrared heating head 8 and the second infrared heating head 9 are provided with an arc heating part 10, and when heating, the pipe 11 and the pipe fitting are located between the arc heating part 10, so that the heat can be more evenly transferred to the bonding layer 2 to ensure the heating effect.

[0051] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A hot melt connecting pipe, characterized in that: include: A plurality of connection ends (1) and an adhesive layer (2) arranged inside the connection ends (1), wherein the melting point of the adhesive layer (2) is lower than the melting point of the connection ends (1), a groove portion (3) is provided on the inner side surface of the connection end (1), and a convex strip portion (4) matching the groove portion (3) is provided on the adhesive layer (2).

2. A hot melt connection pipe fitting according to claim 1, characterized in that: The adhesive layer (2) is a composite layer of the connecting end (1).

3. A hot melt connection pipe fitting according to claim 1, characterized in that: The groove portion (3) comprises a bottom surface (301), a first inclined surface (302) and a second inclined surface (303); the angles between the first inclined surface (302) and the second inclined surface (303) and the bottom surface (301) are both obtuse angles.

4. A hot melt connecting pipe fitting according to claim 1, characterized in that: The end of the connection end (1) is provided with a retaining ring (101) connected to the adhesive layer (2).

5. A hot melt connection pipe fitting according to claim 1, characterized in that: A protrusion (5) is provided on the surface of the adhesive layer (2).

6. A hot melt connection pipe fitting according to claim 1, characterized in that: It also comprises a limiting portion (6) arranged in the connecting end (1), the adhesive layer (2) is connected to the side surface of the limiting portion (6), and the inner diameter of the limiting portion (6) is smaller than the inner diameter of the adhesive layer (2).

7. A pipe connection assembly, comprising a pipe (11), characterized in that: It also includes the hot-melt connecting pipe fitting according to any one of claims 1 to 6, wherein the outer diameter of the pipe (11) is not less than the inner diameter of the adhesive layer (2), and the pipe (11) and the hot-melt connecting pipe fitting are bonded after the adhesive layer (2) is melted.

8. A hot melt device, characterized in that: include: A control component (7), and a first infrared heating head (8) and a second infrared heating head (9) respectively connected to the control component (7), wherein the first infrared heating head (8) and the second infrared heating head (9) are used to heat a pipe connection component as described in claim 7.

9. A hot melt device according to claim 8, characterized in that: The first infrared heating head (8) and the second infrared heating head (9) are both provided with an arc-shaped heating portion (10).

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