PPR pipe fitting hot melting die head

Abstract

The utility model relates to the technical field of hot melting die heads, in particular to a PPR pipe fitting hot melting die head which comprises a male die head and a female die head corresponding to the male die head, the male die head comprises a hot melting section, a first cylinder is fixedly welded to the right side of the hot melting section, a first sliding groove is formed in the outer wall of the first cylinder, and a first cleaning assembly is arranged in the first sliding groove. A second column is fixedly connected to the left side of the female die head, a second sliding groove is formed in the outer wall of the second column, a third sliding groove is longitudinally formed in the right side of the second sliding groove, the second sliding groove communicates with the third sliding groove, and a second cleaning assembly is arranged in the second sliding groove. According to the hot melting device, the pipe material is accumulated in the pipe fitting in the hot melting process, secondary plugging is formed between the pipe material and the pipe fitting, continuous welding use is affected, the problem that the connected pipe needing to be heated is blocked due to accumulation of excessive residues is solved through the two scrapers, and daily maintenance is facilitated.

Description

Technical Field

[0001] This utility model relates to the field of hot melt die head technology, specifically a hot melt die head for PPR pipe fittings. Background Technology

[0002] The development of PPR pipe fitting hot melt dies was to solve the problem of weak connections in traditional plastic pipes. Early welding used ordinary heating plates, which had poor temperature control and easily led to leaks or material aging at the joints. With the popularization of PPR materials, modern dies have been upgraded to zoned precise heating, which can adjust the temperature for different parts of the pipe and joint, avoiding scorching or insufficient melting. The inside of the die is also designed with special grooves that fit the shape of the pipe fitting like building blocks, allowing the molten plastic to fuse evenly. At the same time, a gas protection function has been added to prevent high-temperature oxidation and extend service life.

[0003] The utility model with publication number CN217752811U discloses a hot melt die head for PPR pipe fittings, including a punch head and a die head. One side of the punch head is a convex arc surface, and the other side is a plane and is provided with a first screw hole. One side of the die head is provided with a concave arc surface that matches the convex arc surface, and the other side is a plane and is provided with a second screw hole.

[0004] The above-mentioned technical solution is mainly used for hot-melt butt welding of pipe outer diameter. By changing the die head model, hot-melt butt welding can be performed without cutting the pipe. After bonding, it can be opened with an opening tool, which saves time, effort and cost. However, after long-term operation, the inner wall of the mold cavity flow channel and the outer wall of the mold lip are prone to polymer residue due to high temperature oxidation, material degradation and melt retention effect, which leads to flow channel blockage. In addition, the interface between the hot-melt die head and the mold is prone to micro-displacement and sealing failure due to mechanical vibration. Traditional dies use cylindrical channels, and pipe material accumulates outside the pipe during welding, affecting the connection effect and water flow capacity. Therefore, we propose a hot-melt die head for PPR pipe fittings. Utility Model Content

[0005] The purpose of this invention is to provide a PPR pipe fitting hot melt die head to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A PPR pipe fitting hot melt die head includes a punch and a corresponding die head. The punch includes a hot melt section. A first column is welded and fixed to the right side of the hot melt section. A circular groove is formed at the center of the right side of the first column. A hot melt chamber is formed inside the die head. A second column is fixedly connected to the left side of the die head. A threaded groove is formed at the center of the left side of the second column. A bolt is provided in the circular groove. The left half of the bolt is rotatably connected to the circular groove, and the right half is threadedly connected to the threaded groove. A first sliding groove is formed on the outer wall of the first column. A first cleaning component is provided in the first sliding groove. A second sliding groove is formed on the outer wall of the second column. A third sliding groove is formed longitudinally on the right side of the second sliding groove. The second sliding groove and the third sliding groove are connected. A second cleaning component is provided in the second sliding groove.

[0008] The first cleaning component includes a movable block and a first scraper rotatably connected to the movable block. The top of the movable block is provided with a first wooden handle, and the bottom of the movable block is provided with a first slider. Both sides of the first slider are provided with first limiting rods.

[0009] The second cleaning component includes a hollow column and an extension rod slidably connected to the hollow column. A second scraper is fixedly connected to the bottom of the extension rod, and a second wooden handle is fixedly connected to the top of the hollow column.

[0010] Preferably, both the hot-melt section and the first column are hollow, and the top of the left end of the hot-melt section has an opening. The outer wall of the first column has symmetrical first heat dissipation holes. The hot-melt section is a three-section connection in a longitudinal stepped shape.

[0011] In this invention, the longitudinal stepped design of the hot-melt section allows the pipe material to accumulate inside the pipe during the hot-melt process, forming a secondary seal between the pipe and the pipe, thus improving the connection effect. The first column is fixed to the bolt-connected circular groove for rotational fixation, so that the punch head is firmly fixed on the outer wall of the heating table. The symmetrically designed heat dissipation holes allow the hot-melt section and the inside of the first column to dissipate heat in a timely manner during the heating process.

[0012] Preferably, the hot melt chamber has an inlet at the top right end, the second column has symmetrically arranged second heat dissipation holes on its outer wall, and the hot melt chamber has an inlet section that matches the hot melt section.

[0013] In this invention, the mold section paired with the hot-melt section ensures that the dimensions of the inserted pipe match after hot-melt, making the pipe firmly connected and not easily loosened. The second column is fixed with the threaded groove of the bolt, so that the concave mold head is firmly fixed on the outer wall of the heating table. The symmetrically designed heat dissipation holes allow the hot-melt chamber and the interior of the second column to dissipate heat and vent air in time during the heating process, which helps the PPR pipe to be inserted for hot-melt fitting.

[0014] Preferably, the first groove surrounds the outer wall of the first column, and a circular hole and a threaded hole are provided on the left side of the movable block near the first groove. The first scraper is provided with a corresponding circular hole and a threaded hole. A rotating rod is connected through the center of the circular hole, and a limit screw is connected through the center of the threaded hole.

[0015] In this invention, the first slide rotates around the first column, driving the first slider, the movable block, and the first scraper to rotate together. The first limiting rod prevents the first slider from falling off during rotation, allowing the first scraper to clean the residue on the outer wall of the hot-melt section, thus avoiding the problem of blockage of the connected heating pipe due to excessive residue accumulation. The rotating rod can rotate the first scraper, lowering and retracting it. The limiting screw fixes the first scraper above the hot-melt section after work, without affecting the hot-melt operation. The first wooden handle prevents the handle from getting too hot after hot-melt operation, making it difficult to rotate the first cleaning component.

[0016] Preferably, the first scraper is L-shaped, with an outer arc-shaped edge on the outer wall of the hot-melt section, and a bending point on the first scraper corresponding to the outer arc-shaped edge, and the shape of the first scraper fits well with the bending point of the outer arc-shaped edge.

[0017] In this invention, the first scraper is designed in an L-shape to fit the outer arc edge, so that the bending point of the first scraper fits with the bending part of the outer arc edge. This allows the first scraper to fit tightly against the outer wall of the hot-melt section during cleaning. Furthermore, the sides of the first scraper are relatively thin, resulting in less contact area with the outer wall of the hot-melt section, which reduces the friction between the first scraper and the outer wall of the hot-melt section. This makes rotation more time-saving and labor-saving, and the sharp end can clean the residue more thoroughly.

[0018] Preferably, the second groove surrounds the outer wall of the second column, the third groove extends from the second groove to the right to near the edge of the second column, the second groove and the third groove are connected together in a T shape, the center of the extension rod is provided with a second limiting rod, the hollow column is provided with a second groove, and the extension rod is slidably fixed inside the top of the second groove, and the second scraper is close to the outer wall of the second column.

[0019] In this invention, the second slide groove rotates around the second column, causing the second slider and the second scraper to rotate together. The second slider enters the third slide groove from left to right until it is close to the edge of the second column. The extension rod slides up and down in the second groove, and the second limiting rod fixes the extension rod in the second groove to prevent it from falling off. The extension rod is lowered, causing the second scraper to be lowered, so that the second scraper enters the hot melt chamber for cleaning. This avoids the problem of the heating pipes being blocked due to excessive residue accumulation. The second wooden handle avoids the problem of the handle being too hot after the hot melt is finished, making it difficult to rotate the second cleaning component.

[0020] Preferably, the second scraper is in the shape of a straight line, and the inner wall of the hot melt chamber is provided with an inner arc-shaped edge. The second scraper is provided with a bending point corresponding to the inner arc-shaped edge, and the shape of the first scraper is fitted to fit the bending point of the inner arc-shaped edge.

[0021] In this invention, the second scraper is designed in a straight line shape that matches the inner arc-shaped edge, so that the bending point of the second scraper fits into the bending part of the inner arc-shaped edge. This allows the second scraper to fit tightly against the inner wall of the hot melt chamber during cleaning. Furthermore, the sides of the second scraper are relatively thin, resulting in less contact area with the inner wall of the hot melt chamber, which reduces the friction between the second scraper and the inner wall of the hot melt chamber. This makes rotation more time-saving and labor-saving, and the sharp end can clean the residue more thoroughly.

[0022] Compared with the prior art, the beneficial effects of this utility model are:

[0023] 1. This utility model, through the cooperation of a punch head, a die head, a first cleaning component, and a second cleaning component, and the stepped pairing design of the hot-melt section and the hot-melt chamber, prevents the pipe material from accumulating inside the pipe during the hot-melt process, thus avoiding secondary blockage between the pipe and the pipe and affecting continuous welding. Two sliders drive two scrapers to rotate around the hot-melt section and the hot-melt chamber, allowing the two scrapers to clean the residue on the outer wall of the hot-melt section and the inner wall of the hot-melt chamber, thereby avoiding the problem of blockage of the connected pipe that needs to be heated due to excessive residue accumulation.

[0024] 2. This utility model, through the cooperation of the punch head, the die head, and the bolts, allows the punch head and the die head to be tightly fixed to the left and right outer walls of the heating table. The bolts can withstand high temperatures and will not reduce the stability of the punch head and the die head due to temperature rise. During the heating process, the punch head and the die head are tightly fixed. When the die head expands due to heat, the bolts can automatically adjust their tightness to avoid deformation and jamming. Moreover, it is easy to disassemble and assemble. During maintenance, the die head can be quickly separated for cleaning by unscrewing the bolts, which is also convenient for daily maintenance. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0026] Figure 2 This is a schematic diagram of the structure of the first cleaning component of this utility model;

[0027] Figure 3 This is a schematic diagram of the structure of the second cleaning component of this utility model;

[0028] Figure 4 This is a schematic diagram of the punch head and the first cleaning component of this utility model;

[0029] Figure 5 This is a schematic diagram of the structure of the concave die head and the second cleaning component of this utility model;

[0030] Figure 6 This is a schematic diagram of the bolt structure of this utility model;

[0031] Figure 7 In this utility model Figure 4 Enlarged structural diagram of part A;

[0032] Figure 8 In this utility model Figure 5 A magnified structural diagram of part B.

[0033] The meanings of the labels in the diagram are as follows:

[0034] 1. Punch head; 101. Hot melt section; 102. First column; 103. First heat dissipation hole; 104. Circular groove; 105. First sliding groove; 106. Outer arc edge;

[0035] 2. Die head; 201. Hot melt chamber; 202. Second column; 203. Mold inlet; 204. Second heat dissipation hole; 205. Threaded groove; 206. Second slide groove; 207. Third slide groove; 208. Inner arc edge;

[0036] 3. Bolts;

[0037] 4. First cleaning component; 401. First slider; 402. First limiting rod; 403. Movable block; 404. Rotating rod; 405. Limiting screw; 406. First groove; 407. First scraper; 408. First wooden handle; 409. Circular hole; 410. Threaded hole;

[0038] 5. Second cleaning component; 501. Second slider; 502. Second limiting rod; 503. Hollow column; 504. Extension rod; 505. Second scraper; 506. Second groove; 507. Second wooden handle. Detailed Implementation

[0039] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0040] Please see Figures 1-8 This embodiment provides a technical solution:

[0041] A PPR pipe fitting hot melt die head includes a punch head 1 and a corresponding concave die head 2. The punch head 1 includes a hot melt section 101. A first column 102 is welded and fixed to the right side of the hot melt section 101. A circular groove 104 is opened at the center of the right side of the first column 102. Furthermore, both the hot melt section 101 and the first column 102 are hollow designs, and an opening is opened at the top left end of the hot melt section 101. First heat dissipation holes 103 are symmetrically opened on the outer wall of the first column 102. The hot melt section 101 is three connected segments and has a longitudinal stepped shape.

[0042] In this embodiment, the longitudinal stepped design of the hot melt section 101 allows the pipe material to accumulate inside the pipe during the hot melt process, forming a secondary seal between the pipe and the pipe, thus improving the connection effect. The first column 102 is fixedly connected to the bolt 3 and rotated to fix the circular groove 104, so that the punch head 1 is firmly fixed on the outer wall of the heating table. The symmetrically designed first heat dissipation hole 103 allows the hot melt section 101 and the interior of the first column 102 to dissipate heat in time during the heating process.

[0043] Specifically, a hot melt chamber 201 is provided inside the die head 2. A second column 202 is fixedly connected to the left side of the die head 2. A threaded groove 205 is provided at the center of the left side of the second column 202. A bolt 3 is provided in the circular groove 104. The left half of the bolt 3 is rotatably connected to the circular groove 104, and the right half is threadedly connected to the threaded groove 205. Furthermore, an inlet 203 is provided at the top right end of the hot melt chamber 201. Second heat dissipation holes 204 are symmetrically provided on the outer wall of the second column 202. An inlet section matching the hot melt section 101 is provided inside the hot melt chamber 201.

[0044] In this embodiment, the mold insertion section paired with the hot melt section 101 ensures that the dimensions of the inserted pipe match after hot melt, making the pipe firmly connected and not easily loosened. The second column 202 is fixedly connected to the bolt 3 via the threaded groove 205, so that the concave mold head 2 is firmly fixed on the outer wall of the heating table. The symmetrically designed second heat dissipation holes 204 allow the hot melt chamber 201 and the interior of the second column 202 to dissipate heat and exhaust air in a timely manner during the heating process, which helps the PPR pipe to be inserted for hot melt fitting.

[0045] Specifically, a first groove 105 is formed on the outer wall of the first column 102, and a first cleaning component 4 is provided in the first groove 105. The first cleaning component 4 includes a movable block 403 and a first scraper 407 rotatably connected to the movable block 403. A first wooden handle 408 is provided on the top of the movable block 403, and a first slider 401 is provided on the bottom of the movable block 403. A first limiting rod 402 is provided on both sides of the first slider 401. Furthermore, the first groove 105 surrounds the outer wall of the first column 102, and the left side of the movable block 403 is close to the first... A circular hole 409 and a threaded hole 410 are provided at a groove 406. A first scraper 407 is provided with a corresponding circular hole 409 and a threaded hole 410. A rotating rod 404 is connected through the center of the circular hole 409, and a limit screw 405 is connected through the center of the threaded hole 410. The first scraper 407 is L-shaped, and an outer arc edge 106 is provided on the outer wall of the hot melt section 101. A bending point is provided on the first scraper 407 at the position corresponding to the outer arc edge 106, and the shape of the first scraper 407 fits well with the bending point of the outer arc edge 106.

[0046] In this invention, the first slide groove 105 rotates around the first column 102, causing the first slider 401, the movable block 403, and the first scraper 407 to rotate together. The first limiting rod 402 prevents the first slider 401 from falling off during rotation, allowing the first scraper 407 to clean residues on the outer wall of the hot melt section 101, thus avoiding blockage of the connected heating pipes due to excessive residue accumulation. The rotating rod 404 can rotate the first scraper 407, allowing it to be lowered and retracted. The limiting screw 405 fixes the first scraper 407 above the hot melt section 101 after work is completed. Without affecting the hot-melting process, the first wooden handle 408 avoids the problem of the handle getting too hot after the hot-melting process, making it difficult to rotate the first cleaning component 4. The first scraper 407 is designed in an L-shape to fit the outer arc edge 106, so that the bending point of the first scraper 407 fits with the bending part of the outer arc edge 106. This allows the first scraper 407 to fit tightly against the outer wall of the hot-melting section 101 during cleaning. In addition, the sides of the first scraper 407 are relatively thin, resulting in less contact area with the outer wall of the hot-melting section 101, reducing the friction between the first scraper 407 and the outer wall of the hot-melting section 101. This makes rotation more time-saving and labor-saving, and the sharp end can clean the residue more thoroughly.

[0047] Specifically, a second groove 206 is formed on the outer wall of the second column 202, and a third groove 207 is formed longitudinally on the right side of the second groove 206. The second groove 206 and the third groove 207 are connected. A second cleaning component 5 is provided in the second groove 206. The second cleaning component 5 includes a hollow column 503 and an extension rod 504 slidably connected to the hollow column 503. A second scraper 505 is fixedly connected to the bottom of the extension rod 504. A second wooden handle 507 is fixedly connected to the top of the hollow column 503. Furthermore, the second groove 206 surrounds the outer wall of the second column 202, and the third groove 207 extends to the right from the second groove 206. The extension rod 504 extends to the edge of the second column 202. The second groove 206 and the third groove 207 are connected together in a T-shape. The center of the extension rod 504 is provided with the second limiting rod 502. The hollow column 503 has a second groove 506 inside, and the extension rod 504 is slidably fixed inside the top of the second groove 506. The second scraper 505 is close to the outer wall of the second column 202. The second scraper 505 is in the shape of a straight line. The inner wall of the hot melt chamber 201 is provided with an inner arc edge 208. The second scraper 505 has a bending point corresponding to the inner arc edge 208. The shape of the first scraper 407 fits and matches the bending point of the inner arc edge 208.

[0048] In this invention, the second slide groove 206 rotates around the second column 202, causing the second slider 501 and the second scraper 505 to rotate together. The second slider 501 enters the third slide groove 207 from left to right until it is close to the edge of the second column 202. The extension rod 504 slides up and down in the second groove 506. The second limiting rod 502 fixes the extension rod 504 in the second groove 506 to prevent it from falling off. The extension rod 504 lowers, causing the second scraper 505 to lower, so that the second scraper 505 can enter the hot melt chamber 201 for cleaning, thereby avoiding the blockage of the connected heating pipes due to excessive residue accumulation. To address the issue of clogging, the second wooden handle 507 prevents the handle from becoming too hot after the heat-melting process, making it difficult to rotate the second cleaning component 5. The second scraper 505 is designed in a straight shape that matches the inner arc-shaped edge 208, so that the bending point of the second scraper 505 fits into the bending part of the inner arc-shaped edge 208. This allows the second scraper 505 to fit tightly against the inner wall of the heat-melting chamber 201 during cleaning. Furthermore, the sides of the second scraper 505 are relatively thin, resulting in less contact area with the inner wall of the heat-melting chamber 201, reducing the friction between the second scraper 505 and the inner wall of the heat-melting chamber 201. This makes rotation more time-saving and labor-saving, and the sharp end can clean residue more thoroughly.

[0049] In this embodiment, when the PPR pipe fitting hot melt die head is in use, the punch head 1 and the die head 2 are respectively rotatably connected to the bolt 3 through the circular groove 104 and threadedly connected to the threaded groove 205. The first slider 401 with the first limiting rod 402 is slidably connected in the first slide groove 105. The movable block 403 is fixedly connected to the first slider 401. The first scraper 407 is inserted into the first groove 406. The limiting screw 405 and the rotating rod 404 limit, fix and rotate the first scraper 407 through the threaded hole 410 and the circular hole 409, respectively. The first wooden handle 408 is installed on the movable block 403. Then, the second slider 501 is slidably connected in the second slide groove 206. Then, the hollow column 503 and the second slider 501 are fixedly connected. The second limiting rod 502 with the extension rod 504 is slidably fixed in the second groove 506. Then, the second scraper 505 is fixedly connected to the extension rod 504. The second wooden handle 507 is installed on the hollow column 503.

[0050] When pipe hot melting is required, first adjust the punch head 1 and the die head 2 to fit tightly against both sides of the heating table, insert the outer mold tube to be hot melted into the outer wall of the heated hot melt section 101 until it is connected to the first column 102, and then insert the inner mold tube into the inner wall of the heated hot melt chamber 201 until it is connected to the second column 202.

[0051] After heating the inner and outer mold tubes for ten seconds according to the thickness of the mold tube, remove the inner and outer mold tubes. After the hot melting work is completed, wait for the punch head 1 and the die head 2 to cool down, then unscrew the limit screw 405, so that the first scraper 407 hangs down toward the side wall of the hot melting section 101, so that the bending point of the first scraper 407 fits with the bending point of the outer arc edge 106. Then, by pushing the first wooden handle 408, the entire first cleaning component 4 rotates in the first slide groove 105, driving the scraper to clean the outer wall of the hot melting section 101. After cleaning, retract the first scraper 407 upwards and screw back the limit screw 405 to limit and fix the first scraper 407.

[0052] Then push the hollow column 503 to the junction of the second slide groove 206 and the third slide groove 207, pushing the hollow column 503 into the slide of the third slide groove 207. The hollow column 503 drives the operation of the entire second cleaning component 5. The hollow column 503 moves to the outermost edge of the third slide groove 207, and pull the extension rod 504 downward, driving the second scraper 505 downward until it can not be lowered any further. Then push the hollow column 503 back into the slide of the second slide groove 206. At this time, the bending point of the second scraper 505 is in close contact with the bending point of the inner arc edge 208. Push the second wooden handle 507 to drive the entire second cleaning component 5 to rotate around the second slide 206, cleaning the inner wall of the hot melt chamber 201. After cleaning, tilt the entire die head 2 to tilt out the impurities in the hot melt chamber 201. Move the hollow column 503 to the outermost edge of the third slide 207 again, pull the extension rod 504 upward, driving the second scraper 505 upward until it can no longer be pulled up, and then push the hollow column 503 back into the slide of the second slide 206. At this time, the second cleaning component 5 is retracted.

Claims

1. A PPR pipe fitting hot melt die head, comprising a punch (1) and a corresponding die head (2), characterized in that: The punch (1) includes a hot melt section (101), a first column (102) is welded and fixed to the right side of the hot melt section (101), a circular groove (104) is provided at the center of the right side of the first column (102), a hot melt chamber (201) is provided inside the die head (2), a second column (202) is fixedly connected to the left side of the die head (2), a threaded groove (205) is provided at the center of the left side of the second column (202), a bolt (3) is provided in the circular groove (104), and the left half of the bolt (3) is connected to the circular groove. (104) Rotary connection, the right half is threadedly connected to the threaded groove (205), the outer wall of the first column (102) is provided with a first sliding groove (105), the first sliding groove (105) is provided with a first cleaning component (4), the outer wall of the second column (202) is provided with a second sliding groove (206), the right side of the second sliding groove (206) is provided with a third sliding groove (207) longitudinally, the second sliding groove (206) and the third sliding groove (207) are connected, the second sliding groove (206) is provided with a second cleaning component (5); The first cleaning component (4) includes a movable block (403) and a first scraper (407) rotatably connected to the movable block (403). The top of the movable block (403) is provided with a first wooden handle (408), and the bottom of the movable block (403) is provided with a first slider (401). The first slider (401) is provided with a first limiting rod (402) on both sides. The second cleaning component (5) includes a hollow column (503) and an extension rod (504) slidably connected to the hollow column (503). A second scraper (505) is fixedly connected to the bottom of the extension rod (504), and a second wooden handle (507) is fixedly connected to the top of the hollow column (503).

2. The PPR pipe fitting hot melt die head according to claim 1, characterized in that: Both the hot melt section (101) and the first column (102) are hollow and the hot melt section (101) has an opening at the top left end. The first heat dissipation hole (103) is symmetrically opened on the outer wall of the first column (102). The hot melt section (101) is three connected sections and has a longitudinal stepped shape.

3. The PPR pipe fitting hot melt die head according to claim 1, characterized in that: The hot melt chamber (201) has an inlet (203) at the top right end, and the second column (202) has symmetrically provided second heat dissipation holes (204) on its outer wall. The hot melt chamber (201) has an inlet section that matches the hot melt section (101) inside.

4. The PPR pipe fitting hot melt die head according to claim 1, characterized in that: The first groove (105) surrounds the outer wall of the first column (102). The movable block (403) has a circular hole (409) and a threaded hole (410) on its left side near the first groove (406). The circular hole (409) and the threaded hole (410) both extend to the first scraper (407). A rotating rod (404) is connected through the center of the circular hole (409), and a limit screw (405) is connected through the center of the threaded hole (410).

5. The PPR pipe fitting hot melt die head according to claim 1, characterized in that: The first scraper (407) is L-shaped, and an outer arc edge (106) is provided on the outer wall of the hot melt section (101). A bending point is provided on the first scraper (407) corresponding to the outer arc edge (106), and the shape of the first scraper (407) fits well with the bending point of the outer arc edge (106).

6. The PPR pipe fitting hot melt die head according to claim 1, characterized in that: The second groove (206) surrounds the outer wall of the second column (202), and the third groove (207) extends from the second groove (206) to the right to the edge of the second column (202). The second groove (206) and the third groove (207) are connected together in a T-shape. The extension rod (504) has a second limiting rod (502) through its center. The hollow column (503) has a second groove (506) inside, and the extension rod (504) is slidably fixed inside the top of the second groove (506). The second scraper (505) is close to the outer wall of the second column (202).

7. The PPR pipe fitting hot melt die head according to claim 1, characterized in that: The second scraper (505) is in the shape of a straight line. The inner wall of the hot melt chamber (201) is provided with an inner arc edge (208). The first scraper (407) is provided with a bending point corresponding to the inner arc edge (208), and the shape of the first scraper (407) is in close fit with the bending point of the inner arc edge (208).

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