Hot melting die head capable of sealing end of section of pipe

Abstract

The utility model relates to a hot melting die head capable of sealing the cross section of a pipe. The technical problem that in the prior art, design is not reasonable enough is solved. Comprising a die head body, a die head base, an outer ring body, an inner ring body and a melt groove, the melt groove is horizontally or obliquely arranged, the cross section of the melt groove is in an arc shape, and a flow guide structure communicating with the melt groove is arranged on the circumferential inner side of the end, close to the die head base, of the outer ring body; the end, away from the die head base, of the outer ring body is a birdmouth allowing a pipe fitting to be inserted therein, the birdmouth is provided with a birdmouth guide structure, and a counter bore type mounting hole is formed in the die head base. The aluminum-plastic pipe has the advantages that the melting groove with the arc-shaped section is formed between the inner ring and the outer ring, flowing plastic preferentially fills the melting groove during welding, the flowing plastic wraps and seals the section of the aluminum-plastic pipe, the problem that an aluminum strip on the section of the aluminum-plastic pipe is exposed during conventional hot melting is solved, and the problem that the section is layered when encountering water is solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to pipe fitting processing equipment technical field, specifically relates to a kind of hot melt die head that can make pipe section end sealing. BACKGROUND

[0002] At present, aluminum plastic pipe and PPR pipe are widely used in concealed water supply pipe system of home decoration, and most of them are hot melt welding. That is, the heating plate of the hot melt machine is powered to generate high temperature, and the port of the pipe in contact is heated and melted before being connected. For aluminum plastic pipe, special double hot melt die head and special double hot melt die head are often needed during welding. Special double hot melt pipe fittings are needed to be used, and due to the high cost of pipe fittings and the trouble of die head replacement, once the welding problem occurs, it will cause functional loss of the system, and it is difficult to find out in the first time.

[0003] If aluminum plastic pipe and PPR pipe need to be welded at the same time, the replacement of die head will also affect the construction efficiency. At the same time, the welding technology of electrician in the market is uneven, and the depth of socket is not marked during hot melt welding due to the operation habit of construction workers, which leads to the situation that socket is too deep or not in place. Excessive socket makes the molten material of pipe port accumulate in the pipe, which leads to reduction in diameter, and insufficient socket of aluminum plastic pipe leads to contact between pipe port section and water, which leads to product delamination under long-term water scouring.

[0004] In order to solve the problems existing in the prior art, people have carried out long-term exploration and put forward various kinds of solutions. For example, Chinese patent document discloses a concave type fusion joint die head of hot melt machine [201620526134.1], which includes a concave die body with one end opening and capable of accommodating pipe fittings. The concave die body forms an accommodating cavity capable of accommodating the end of pipe fitting inside, and a protrusion with size and shape matched with the inner cavity of pipe fitting is formed inside the accommodating cavity and at the bottom of the concave die body.

[0005] The above scheme solves the problem of molten material accumulation in pipe port to some extent, which leads to reduction in diameter, but in the scheme, the pipe section cannot be closed, especially when used in aluminum plastic pipe hot melt socket, which is easy to cause contact between pipe port section and water, which leads to product delamination under long-term water scouring. SUMMARY

[0006] The utility model aims at the above problems, and provides a kind of hot melt die head that can make pipe section end sealing.

[0007] To achieve the above object, the utility model discloses the following technical scheme: a hot melt die that can make pipe material cross section end sealing, including die body, the die body has die seat, one end of die seat is connected with the outer ring body and the inner ring body of the coaxial arrangement of die seat, the inner ring body is located the circumferential inside of outer ring body, the outer ring body and the inner ring body between form the annular melt channel at one end of die seat, melt channel is horizontally or obliquely arranged and the cross section of melt channel is arc, the circumferential inside of one end of outer ring body close to die seat has the flow guide structure that is linked with melt channel, one end of outer ring body away from die seat is the receiving port for pipe fitting insertion and the receiving port on has the socket guide structure, the die seat is equipped with the counterbore type mounting hole.

[0008] In the above-mentioned hot melt die that can make pipe material cross section end sealing, the die seat is disc-shaped, and the outer ring body and the inner ring body are integrally formed at one end of the die seat.

[0009] In the above-mentioned hot melt die that can make pipe material cross section end sealing, the counterbore type mounting hole includes a screw hole arranged at the center of the die seat and axially penetrating through the die seat, and one end of the screw hole is in communication with a screw hole counterbore arranged at one end of the die seat and located on the circumferential inside of the inner ring body.

[0010] In the above-mentioned hot melt die that can make pipe material cross section end sealing, the melt channel has equal height on both sides, the melt channel is horizontally arranged, and the central axis of the melt channel and the central axis of the die seat are arranged in parallel.

[0011] In the above-mentioned hot melt die that can make pipe material cross section end sealing, the melt channel is obliquely arranged towards the circumferential outside of the inner ring body, and the height of the melt channel near the outer ring body is greater than the height of the melt channel near the inner ring body.

[0012] In the above-mentioned hot melt die that can make pipe material cross section end sealing, an included angle is formed between the central axis of the melt channel and the central axis of the die seat, and the included angle is an acute angle.

[0013] In the above-mentioned hot melt die that can make pipe material cross section end sealing, the height of the inner ring body is less than the height of the outer ring body, and the height of the outer ring body is 9-11 times the height of the inner ring body.

[0014] In the above-mentioned hot melt die that can make pipe material cross section end sealing, the flow guide structure includes a plurality of flow guide grooves arranged on the circumferential inside of one end of the outer ring body close to the die seat and extending along the axis of the outer ring body, one end of the flow guide groove extends into the melt channel and is in communication with the melt channel, and the depth of one end of the flow guide groove extending into the melt channel gradually decreases to the depth of the other end.

[0015] In the hot melt die capable of sealing the section of the pipe material, the die body is a hot melt female die, the width of the melt groove is not less than the wall thickness of the pipe, and the outer ring body circumferential outer side, the inner ring body circumferential outer side, the upper end face and the melt groove are respectively provided with an anti-sticking layer, and the anti-sticking layer is a polytetrafluoroethylene layer.

[0016] In the hot melt die capable of sealing the section of the pipe material, the socket guiding structure comprises a socket arc chamfer portion arranged in the circumferential direction of the socket, and the socket arc chamfer portion extends to one end face of the outer ring body on one side and extends to the circumferential inner side of the outer ring body on the other side.

[0017] Compared with the prior art, the hot melt die has the advantages that:

[0018] 1, the hot melt die is an inner and outer ring structure, and the inner and outer rings are connected by a melt groove with an arc-shaped section, so that the flowing plastic can fill the melt groove first during welding, thereby avoiding the problem of excessive melt bumps and internal extrusion of the pipe material in the double hot melt die, and the flowing plastic can wrap and seal the section of the aluminum-plastic pipe, thereby solving the problem of aluminum strip exposure in the conventional hot melting of the aluminum-plastic pipe section, reducing the problem of delamination of the section when encountering water, and reducing the requirement of special double hot melting for the aluminum-plastic pipe.

[0019] 2, the socket guiding structure can facilitate the insertion of the pipe into the outer ring body, and is more labor-saving, and the design of the flow guiding structure can make the flowing plastic fill the melt groove better. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a sectional view of the embodiment one of the utility model.

[0021] Figure 2 is a structural schematic view of the embodiment one of the utility model.

[0022] Figure 3 is a sectional view of the embodiment two of the utility model.

[0023] In the drawing: die body 1, die seat 11, outer ring body 12, inner ring body 13, melt groove 14, socket 15, anti-sticking layer 16, flow guiding structure 2, flow guiding groove 21, socket guiding structure 3, socket arc chamfer portion 31, counterbore mounting hole 4, screw hole 41, screw hole counterbore 42, included angle α. DETAILED DESCRIPTION

[0024] The utility model will be explained in further detail in combination with the drawings and specific implementation.

[0025] Embodiment one

[0026] As Figures 1-2As shown, a hot melt die head capable of sealing the cross section of pipe material, comprising a die head body 1, where the die head body 1 is a hot melt female die, the die head body 1 has a die head seat 11, one end of the die head seat 11 is connected with an outer ring body 12 and an inner ring body 13 coaxially arranged with the die head seat 11, the inner ring body 13 is located on the circumferential inner side of the outer ring body 12, wherein the die head seat 11 here is disc-shaped and the outer ring body 12 and the inner ring body 13 are integrally formed on one end of the die head seat 11. The outer ring body 12 and the inner ring body 13 form a molten material groove 14 in the form of a ring at one end of the die head seat 11, the molten material groove 14 is horizontally or obliquely arranged and the cross section of the molten material groove 14 is arc-shaped, the circumferential inner side of the end of the outer ring body 12 close to the die head seat 11 has a flow guide structure 2 connected with the molten material groove 14, the end of the outer ring body 12 away from the die head seat 11 is a receiving port 15 for pipe insertion and the receiving port 15 has a socket guide structure 3 thereon, the groove width of the molten material groove 14 is not less than the wall thickness of the pipe, and the die head seat 11 is provided with a counterbore type mounting hole 4. The die head body 1 is an inner and outer ring structure, and the molten material groove 14 is between the inner and outer rings. When heated, the flowing plastic will fill the molten material groove 14 first, avoiding the formation of a melt tumor. And the cross section of the molten material groove 14 is arc-shaped, which makes the flowing plastic evenly cover the end port of the pipe material, preventing the aluminum strip from being exposed and preventing the pipe material end port from contacting water to cause product delamination. The flow guide structure 2 here plays a role in guiding the flowing plastic, enabling the flowing plastic to be guided into the molten material groove 14 when the pipe is inserted relative to the outer ring body 12.

[0027] Wherein, the counterbore type mounting hole 4 here includes a threaded hole 41 arranged at the center of the die head seat 11 and axially penetrating through the die head seat 11, and one end of the threaded hole 41 is in communication with a threaded hole counterbore 42 arranged at one end of the die head seat 11 and located on the circumferential inner side of the inner ring body 13. During installation, the die head body 1 is installed on one side of the heating plate of the heating machine by passing the threaded hole 41 through the bolt, and the hot melt male die is located on the other side and coaxially arranged with the die head body 1.

[0028] Further, the height of the molten material groove 14 on both sides is equal, the molten material groove 14 is horizontally arranged and the central axis of the molten material groove 14 and the central axis of the die head seat 11 are arranged in parallel with each other. Wherein, the height of the inner ring body 13 is less than the height of the outer ring body 12 and the height of the outer ring body 12 is 9-11 times the height of the inner ring body 13.

[0029] In order to facilitate the flow of plastic, the flow guide structure 2 here includes a plurality of flow guide grooves 21 arranged on the circumferential inner side of the end of the outer ring body 12 close to the die head seat 11 and arranged axially along the outer ring body 12, one end of the flow guide groove 21 extends into the molten material groove 14 and is in communication with the molten material groove 14, and the depth of one end of the flow guide groove 21 extending into the molten material groove 14 gradually decreases from the other end.

[0030] The outer ring body 12, the inner ring body 13 and the upper end face are respectively provided with an anti-sticking layer 16 on the outer side, the inner side and the upper end face, and the molten material groove 14. The anti-sticking layer 16 is a polytetrafluoroethylene layer. The die is coated with Teflon material around the die to prevent sticking of the material under special circumstances after the temperature rises.

[0031] Further, the spigot guide structure 3 comprises a spigot arc-shaped chamfer 31 arranged on the circumference of the spigot 15, and the spigot arc-shaped chamfer 31 extends to one end face of the outer ring body 12 on one side and extends to the inner side of the outer ring body 12 on the other side. The spigot 15 is provided with a circular arc chamfer on the circumference to facilitate the insertion of the pipe into the die.

[0032] The principle of the embodiment is that:

[0033] Before the pipe is welded, a suitable die is selected according to the wall thickness of the pipe. The size of the die is determined according to the outer diameter of the pipe and the pipe series, and different specifications of the die are selected according to actual needs. In the embodiment, the width of the die is limited, and the width between the inner and outer rings, i.e. the width of the molten material groove 14, should be equal to or slightly smaller than the wall thickness of the pipe, so that the pipe inserted into the die is in close contact with the inner wall of the die, avoiding excessive extrusion of the molten part to the inside, causing excessive molten tumor. For example, for a dn25 pipe with a wall thickness of 4.2mm, the width between the inner and outer rings of the die is 4.0mm; for a dn25 pipe with a wall thickness of 3.5mm, the width between the inner and outer rings of the die is 3.5mm. The depth of the die is limited to avoid the problem of pipe shrinkage caused by excessive spigot due to poor force control during welding. For example, the standard dn25 pipe stipulates that the minimum spigot depth is 12.5mm, and the die depth is controlled within 13-15mm. During the welding process, the pipe must be spigoted to the bottom to prevent the pipe from being unable to be sealed due to incomplete welding.

[0034] In the embodiment, before the pipe is welded, a suitable size of the die is selected according to the wall thickness of the pipe. The size of the die is determined according to the outer diameter of the pipe, and different specifications of the die are selected according to actual needs.

[0035] In use, the heating plate is powered on to work, and the hot melting male die and the hot melting female die are heated to between 260-280℃. Two pipes to be connected and a pipe or a joint are respectively inserted into the hot melting male die and the hot melting female die without rotation, and are respectively pushed to the bottom of the hot melting male die and the hot melting female die. The hot melting female die is an inner and outer ring structure, and the molten material groove 14 is between the inner and outer rings. When heated, the flowing plastic will fill the molten material groove 14 first, avoiding the generation of molten tumor. Moreover, the flowing plastic will cover the pipe cross-section port, preventing the aluminum belt from being exposed, and preventing the pipe port from being in contact with water to cause the product to be layered. After heating is completed, the pipe and the joint are simultaneously withdrawn from the hot melting male die and the hot melting female die, and the spigot is quickly inserted into the spigot without rotation to form a uniform flange at the end of the spigot.

[0036] Embodiment two

[0037] As Figure 3 The structure, principle and embodiment steps of the present embodiment are similar to those of the first embodiment, except that the melt groove 14 is inclined towards the outer side of the inner ring body 13 in the present embodiment, and the height of the melt groove 14 near the outer ring body 12 is greater than the height of the melt groove 14 near the inner ring body 13, so that the flowing plastic entering the melt groove 14 from the outer ring body 12 flows first to the side of the melt groove 14 near the inner ring body 13, avoiding the accumulation of flowing plastic. The angle α between the central axis of the melt groove 14 and the central axis of the die holder 11 is an acute angle, for example, the angle is about 6 degrees, which can not only play a guiding role, but also prevent the flowing plastic from passing through the inner ring body 13.

[0038] The specific embodiments described herein are merely illustrative of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, without deviating from the spirit of the present application or exceeding the scope defined by the appended claims.

[0039] Although the terms die body 1, die holder 11, outer ring body 12, inner ring body 13, melt groove 14, receiving port 15, anti-sticking layer 16, flow guide structure 2, flow guide groove 21, receiving port guide structure 3, receiving port arc chamfer 31, counterbore mounting hole 4, screw hole 41, screw hole counterbore 42, angle α, etc. are used more frequently herein, but the possibility of using other terms is not excluded. The use of these terms is only to facilitate the description and explanation of the essence of the present application; any interpretation of them as additional limitations is contrary to the spirit of the present application.

Claims

1. A hot melt die head capable of sealing the cross-section of a pipe, comprising a die head body (1), wherein the die head body (1) has a die head seat (11), one end of the die head seat (11) is connected to an outer ring body (12) and an inner ring body (13) coaxially arranged with the die head seat (11), the inner ring body (13) is located circumferentially inside the outer ring body (12), and an annular melt groove (14) is formed between the outer ring body (12) and the inner ring body (13) at one end of the die head seat (11), characterized in that, The molten material tank (14) is set horizontally or inclined and the cross-section of the molten material tank (14) is arc-shaped. The outer ring body (12) has a flow guiding structure (2) connected to the molten material tank (14) on the inner side of the circumference of the end near the die head seat (11). The outer ring body (12) away from the die head seat (11) is a socket (15) for inserting pipe fittings and the socket (15) has a socket guide structure (3). The die head seat (11) is provided with a countersunk mounting hole (4).

2. The hot melt die head for sealing the cross-section of a pipe according to claim 1, characterized in that, The mold head base (11) is disc-shaped and the outer ring (12) and inner ring (13) are integrally formed on one end of the mold head base (11).

3. The hot melt die head for sealing the cross-section of a pipe according to claim 1, characterized in that, The countersunk mounting hole (4) includes a screw hole (41) located at the center of the die head seat (11) and extending axially through the die head seat (11), and one end of the screw hole (41) is connected to a countersunk screw hole (42) located at one end of the die head seat (11) and on the inner side of the inner ring body (13).

4. A hot melt die head for sealing the cross-section of a pipe according to claim 1, 2, or 3, characterized in that, The two sides of the molten material tank (14) are at the same height, the molten material tank (14) is horizontally set, and the central axis of the molten material tank (14) is parallel to the central axis of the die head seat (11).

5. A hot melt die head for sealing the cross-section of a pipe according to claim 1, 2, or 3, characterized in that, The melting tank (14) is inclined outward toward the inner ring body (13), and the height of the melting tank (14) near the outer ring body (12) is greater than the height of the melting tank (14) near the inner ring body (13).

6. A hot melt die head for sealing the cross-section of a pipe according to claim 5, characterized in that, The central axis of the molten material tank (14) and the central axis of the die head seat (11) form an angle (α), and the angle (α) is an acute angle.

7. A hot melt die head for sealing the cross-section of a pipe according to claim 1, characterized in that, The height of the inner ring (13) is less than the height of the outer ring (12), and the height of the outer ring (12) is 9-11 times the height of the inner ring (13).

8. A hot melt die head for sealing the cross-section of a pipe according to claim 1, characterized in that, The flow guiding structure (2) includes several flow guiding grooves (21) arranged on the inner side of one end of the outer ring body (12) near the die head seat (11) and extending along the axial direction of the outer ring body (12). One end of the flow guiding groove (21) extends into the melt tank (14) and is connected to the melt tank (14). The depth of the flow guiding groove (21) extending into the melt tank (14) gradually decreases from one end to the other end.

9. A hot melt die head for sealing the cross-section of a pipe according to claim 8, characterized in that, The die head body (1) is a hot melt die, the width of the molten material groove (14) is not less than the wall thickness of the pipe, and the outer ring body (12), the inner ring body (13), the upper end face, and the molten material groove (14) are respectively provided with anti-sticking layers (16), which are polytetrafluoroethylene layers.

10. A hot melt die head for sealing the cross-section of a pipe according to claim 1, characterized in that, The socket guide structure (3) includes a socket arc chamfer (31) disposed around the socket (15). One side of the socket arc chamfer (31) extends to one end face of the outer ring body (12) and the other side extends to the inner side of the outer ring body (12) around the circumference.

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