Flaring forming tool for cold water dip tube in heating system

Abstract

The utility model discloses a flaring forming tool for a cold water dip tube in a heating system. The cold water dip tube is in a bent tube shape. The flaring forming tool comprises a tool positioning plate assembly which comprises an upper tool positioning plate and a lower tool positioning plate, and a bent pipe cavity is formed between the upper tool positioning plate and the lower tool positioning plate. The port positioning rod assembly can extend into the cold water dip tube; the lateral supporting block assembly can abut against the outer wall of the cold water dip tube; the flaring extrusion rod assembly can stretch into the cold water dip tube so that the cold water dip tube can be extruded to form a flaring section. The cold water dip tube forming device is provided with the bent tube cavity, and a flaring section of a cold water dip tube is stably and reliably pressurized and formed by means of the flaring extrusion rod assembly; the positioning rod assembly and the lateral supporting block assembly can position and support the cold water dip tube, the upper tool positioning plate can provide a stable bent tube cavity after being folded relative to the lower tool positioning plate, external environment interference is eliminated, and machining precision is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of processing heating pipe fittings, in particular to an expansion forming tool for a cold water suction pipe in a heating system. Background Art

[0002] Cold water dip pipes usually refer to the piping system used to draw cold water from a water source. This system is usually used for tap water supply in houses, buildings or other places. In this system, the cold water pipe is connected to the main water source, such as a tap water pipe or a water tank, and delivers cold water to places where water is needed, such as kitchens, bathrooms, toilets, etc. The design and installation of cold water dip pipes need to consider many factors, including the location of the water source, the material of the pipe, the diameter of the pipe, the insulation and heat preservation of the pipe, etc. Usually, these pipes are buried underground or installed in the walls or floors of the building. When designing and installing cold water dip pipes, relevant building and pipeline safety specifications need to be followed to ensure the normal operation and safe use of the system. At the same time, it is also very important to regularly inspect and maintain the cold water dip pipe system to ensure that it can effectively provide clean and safe cold water supply in the long term.

[0003] Conventionally, the cold water suction pipe in the heating system is mostly made of metal materials such as copper, brass, stainless steel, etc., and the end of the cold water suction pipe needs to be formed with structures such as threads for connection. Therefore, the wall thickness of the cold water suction pipe will increase, and the difficulty of production and installation will be increased. In order to solve the above product defects, the applicant has optimized the structure of the end of the cold water suction pipe, that is, formed a flared section. In the later assembly process, after the flared section and the external connector are positioned and matched with each other, they are riveted by an instrument to deform the flared section and connect with the external connector.

[0004] In order to form a flared section on the cold water suction pipe, the existing processing tooling is similar to patent document CN212682229U, which belongs to the technical field of evaporator accessories processing, and is specifically a copper tube flaring tooling, wherein a fixture tooling bracket is arranged on the right side of the positioning tooling bracket, and a flaring mold bracket is arranged on the right side of the fixture tooling bracket, a sliding plate is movably installed above the positioning tooling bracket, a positioning plate is installed above the sliding plate, a placement groove is opened on the right side above the body of the positioning plate, pneumatic push rods are installed on the front and rear sides of the upper part of the fixture tooling bracket, and chucks are movably installed on the front and rear sides of the upper part of the fixture tooling bracket, and one end of the two chucks is respectively connected to the telescopic ends of the two pneumatic push rods, and the sliding plate can drive the positioning plate to slide left and right, and the flaring depth of the copper tube is adjusted by adjusting the distance between the positioning plate and the die head, and the flaring depth of the copper tube is fixed by fixing the movable plate and the positioning plate, thereby ensuring that the flaring depth of each pass is the same.

[0005] However, the tooling mentioned in the above literature has certain defects, such as: 1. It is only applicable to straight-tube cold water suction tubes, but not to curved-tube cold water suction tubes; 2. It lacks an effective positioning structure. Once product displacement occurs during the processing, the product will be unqualified; 3. The tooling is an open structure, which is easily disturbed by external factors during the processing, resulting in a decrease in processing accuracy.

[0006] Therefore, it is urgent to develop a new tool that can accurately form the flared section on the cold water suction pipe. Summary of the invention

[0007] In order to overcome the above-mentioned deficiencies in the prior art, the utility model provides a tool for expanding and forming a cold water suction pipe in a heating system.

[0008] The utility model solves the technical problem by providing a flaring forming tool for a cold water suction pipe in a heating system, wherein the cold water suction pipe is in a curved pipe shape, and one end of the cold water suction pipe is a second port, and the other end is a first port;

[0009] The expansion forming tooling includes:

[0010] A tooling positioning plate assembly, comprising an upper tooling positioning plate and a lower tooling positioning plate that can be closed or separated from each other, and when the upper tooling positioning plate and the lower tooling positioning plate are closed, a curved pipe cavity for accommodating a cold water suction pipe is formed between the two;

[0011] A port positioning rod assembly, which is movably arranged at one end of the tooling positioning plate assembly near the first port, the port positioning rod assembly can extend into the cold water draw pipe through the first port, and the rear end of the port positioning rod assembly can abut against the first port of the cold water draw pipe to form a limit fit;

[0012] A lateral support block assembly, which is movably arranged on one side of the tooling positioning plate assembly, and the lateral support block assembly can abut against the outer wall of the cold water extraction pipe;

[0013] A flared extrusion rod assembly is movably arranged at one end near the second port. The flared extrusion rod assembly is in the shape of a cone with a small front and a large rear. The flared extrusion rod assembly can extend into the cold water suction tube through the second port and form an interference fit with the second port of the cold water suction tube to extrude the second port of the cold water suction tube into a flared section.

[0014] The specific structural scheme of the port positioning rod assembly is that the port positioning rod assembly includes a first hydraulically driven cylinder, a first slide seat having a first linear guide groove, a first sliding block slidably arranged in the first linear guide groove and acted upon by the first hydraulically driven cylinder, and a first contoured positioning rod fixed at the front end of the first sliding block.

[0015] Furthermore, the first contoured positioning rod includes a small diameter rod section and a large diameter rod section, the small diameter rod section extends into the cold water extraction tube through the first port, and the large diameter rod section abuts against the first port of the cold water extraction tube to form a limiting fit.

[0016] The specific structural scheme of the lateral support block assembly is that the lateral support block assembly includes a second hydraulically driven cylinder, a second slide seat with a second linear guide groove, a second sliding block slidably arranged in the second linear guide groove and acted upon by the second hydraulically driven cylinder, and a contoured support block fixed at the front end of the second sliding block.

[0017] Furthermore, the front end of the profiling support block has an arc section, and the rear part of the profiling support block is provided with a positioning oblique insertion hole, and a positioning rod can be inserted into the positioning oblique insertion hole.

[0018] The specific structural scheme of the flaring extrusion rod assembly is that the flaring extrusion rod assembly includes a third hydraulically driven cylinder, a third slide seat having a third arc-shaped guide groove, a third sliding block slidably arranged in the third arc-shaped guide groove and acted upon by the third hydraulically driven cylinder, a second profiling positioning rod fixed at the front end of the third sliding block, and a flaring extrusion sleeve rod sleeved on the second profiling positioning rod;

[0019] Wherein, the second contoured positioning rod extends into the cold water extraction tube through the second port and abuts against the first contoured positioning rod;

[0020] The flared extrusion sleeve rod is in a conical shape with a small front and a large rear. The flared extrusion sleeve rod abuts against and acts on the inner wall of the cold water extraction pipe to extrude the second port of the cold water extraction pipe into a flared section.

[0021] Furthermore, the third hydraulic drive cylinder forms a transmission fit with the third sliding block via a Y-shaped rotating joint, wherein the fixed end of the Y-shaped rotating joint is connected to the third sliding block, and the rotating end of the Y-shaped rotating joint is connected to the third hydraulic drive cylinder.

[0022] In a preferred embodiment of the present utility model, heating wires are further provided in the upper tooling positioning plate and the lower tooling positioning plate, and the heating wires are located near the second port of the cold water extraction tube.

[0023] In a preferred embodiment of the utility model, the upper tooling positioning plate and the lower tooling positioning plate are further provided with heat dissipation channels, the heat dissipation channels are filled with heat dissipation liquid, and the ends of the heat dissipation channels are matched with the ends of the flared sections.

[0024] In the utility model, one of the upper tooling positioning plate and the lower tooling positioning plate is provided with a positioning protrusion, and the other is provided with a positioning groove, and the positioning protrusion is embedded in the positioning groove.

[0025] The beneficial effects of the utility model are:

[0026] 1. It has a curved tube cavity, which is specially used for processing curved tube-type cold water suction tubes. With the help of the flaring extrusion rod assembly, the flaring section of the cold water suction tube is stably and reliably pressurized and formed.

[0027] 2. The positioning rod assembly and the lateral support block assembly can position and support the cold water suction pipe. When the upper tooling positioning plate is closed relative to the lower tooling positioning plate, it can provide a stable curved pipe cavity, eliminate external environmental interference, and improve processing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram comparing the structures of the cold water suction pipe before and after the expansion section is formed.

[0029] Figure 2 It is a structural schematic diagram of the utility model (the upper tooling positioning plate and the lower tooling positioning plate are closed).

[0030] Figure 3 It is a schematic diagram of the disassembly of each component in the utility model.

[0031] Figure 4 It is a schematic diagram of the internal structure of the utility model (excluding the cold water extraction tube).

[0032] Figure 5 It is a schematic diagram of the internal structure of the utility model (including the cold water extraction tube).

[0033] Figure 6 is an exploded view of the port locating rod assembly.

[0034] Figure 7 is an exploded view of the lateral support block assembly.

[0035] Figure 8 It is an assembly diagram of the flared extruded rod assembly.

[0036] Fig. 9 is an exploded view of the flared extruded rod assembly.

[0037] Fig.10 It is a structural schematic diagram of the upper tooling positioning plate in the third embodiment.

[0038] Fig.11 It is a structural schematic diagram of the lower tooling positioning plate in the third embodiment.

[0039] In the figure: 1, cold water suction pipe; 101, first port; 102, second port; 103, flared section; 2, tooling positioning plate assembly; 21, upper tooling positioning plate; 22, lower tooling positioning plate; 23, elbow cavity; 24, heating wire; 25, heat dissipation channel; 251, liquid inlet and outlet; 26, positioning protrusion; 27, positioning groove; 3, port positioning rod assembly; 31, first hydraulic drive cylinder; 32, first slide seat; 321, first linear guide groove; 33, first slide block; 34, first contour positioning rod; 341, Small diameter rod section; 342, large diameter rod section; 4, lateral support block assembly; 41, second hydraulic drive cylinder; 42, second slide seat; 421, second linear guide groove; 43, second sliding block; 44, contour support block; 441, arc section; 442, positioning oblique socket; 45, positioning rod; 5, flaring extrusion rod assembly; 51, third hydraulic drive cylinder; 52, third slide seat; 521, third arc guide groove; 53, third sliding block; 54, second contour positioning rod; 55, flaring extrusion sleeve rod; 56, Y-type rotating joint. DETAILED DESCRIPTION

[0040] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments are only specific descriptions of the present invention, and their purpose is to allow those skilled in the art to better understand the technical solution of the present invention, and should not be regarded as limiting the present invention.

[0041] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] Reference Figures 1 to 11 , a tool for expanding and forming a cold water suction pipe in a heating system, wherein the cold water suction pipe 1 is in a curved pipe shape, and one end of the cold water suction pipe 1 is a first port 101, and the other end is a second port 102;

[0044] The expansion forming tooling includes:

[0045] The tooling positioning plate assembly 2 includes an upper tooling positioning plate 21 and a lower tooling positioning plate 22 that can be closed or separated from each other. When the upper tooling positioning plate 21 and the lower tooling positioning plate 22 are closed, a curved tube cavity 23 for accommodating the cold water suction pipe 1 is formed between the two.

[0046] The port positioning rod assembly 3 is movably arranged at one end of the tooling positioning plate assembly 2 close to the first port 101, and the port positioning rod assembly 3 can extend into the cold water suction pipe 1 through the first port 101, and the rear end of the port positioning rod assembly 3 can abut against the first port 101 of the cold water suction pipe 1 to form a limit fit;

[0047] A lateral support block assembly 4, which is movably arranged on one side of the tooling positioning plate assembly 2, and the lateral support block assembly 4 can abut against the outer wall of the cold water extraction pipe 1;

[0048] The flared extrusion rod assembly 5 is movably arranged at one end close to the second port 102. The flared extrusion rod assembly 5 is in the shape of a cone with a small front and a large rear. The flared extrusion rod assembly 5 can extend into the cold water suction tube 1 through the second port 102 and form an interference fit with the second port 102 of the cold water suction tube 1 to extrude the second port 102 of the cold water suction tube 1 into a flared section 103.

[0049] The above content is the basic scheme of the expansion and forming tooling used in the production and processing of the cold water suction tube 1 in the utility model, and its usage is: first, the cold water suction tube 1 to be processed is placed into the corresponding curved tube cavity 23 on the lower tooling positioning plate 22, and then the port positioning rod assembly 3 and the lateral support block assembly 4 are started and play a positioning and supporting role for the cold water suction tube 1, and then the upper tooling positioning plate 21 is closed relative to the lower tooling positioning plate 22 to form a closed curved tube cavity 23, and then the expansion extrusion rod assembly 5 is started and extended into the cold water suction tube 1 to extrude the second port 102 of the cold water suction tube 1 into a flared section 103, and finally the upper tooling positioning plate 21 is separated relative to the lower tooling positioning plate 22, the tooling positioning plate assembly 2, the lateral support block assembly 4 and the expansion extrusion rod assembly 5 are retreated and reset, and the finished cold water suction tube 1 after expansion is taken out.

[0050] It is worth mentioning that compared with the prior art, the utility model has a bent tube cavity 23, which is specially used for processing a bent tube type cold water suction tube 1, and uses the expanding extrusion rod assembly 5 to stably and reliably pressurize and form the expanding section 103 of the cold water suction tube 1; and the positioning rod assembly and the lateral support block assembly 4 can play a positioning and supporting role for the cold water suction tube 1. When the upper tooling positioning plate 21 is closed relative to the lower tooling positioning plate 22, a stable bent tube cavity 23 can be provided, thereby eliminating external environmental interference and improving processing accuracy.

[0051] Embodiment 2

[0052] Based on the structure of the first embodiment, this embodiment provides a preferred structural composition scheme of each component, which is as follows:

[0053] 1. The specific structural scheme of the port positioning rod assembly 3 is as follows: Figure 6 , including a first hydraulically driven cylinder 31, a first slide seat 32 having a first linear guide groove 321, a first sliding block 33 slidably arranged in the first linear guide groove 321 and acted upon by the first hydraulically driven cylinder 31, and a first contoured positioning rod 34 fixed at the front end of the first sliding block 33.

[0054] The working principle of the port positioning rod assembly 3 is as follows: the first hydraulic drive cylinder 31 is started to drive the first sliding block 33 to move forward linearly along the first linear guide groove 321, so that the first sliding block 33 drives the first contoured positioning rod 34 to move forward and form a match with the cold water suction pipe 1 to be processed.

[0055] Preferably, the first contoured positioning rod 34 includes a small diameter rod segment 341 and a large diameter rod segment 342, the small diameter rod segment 341 extends into the cold water suction tube 1 through the first port 101, and the large diameter rod segment 342 abuts against the first port 101 of the cold water suction tube 1 and forms a limit fit to prevent insertion transition, thereby improving the positioning accuracy of the first contoured positioning rod 34 on the cold water suction tube 1.

[0056] 2. The specific structural scheme of the lateral support block assembly 4 is as follows: Figure 7 , including a second hydraulic drive cylinder 41, a second slide seat 42 with a second linear guide groove 421, a second sliding block 43 slidably arranged in the second linear guide groove 421 and acted upon by the second hydraulic drive cylinder 41, and a contoured support block 44 fixed at the front end of the second sliding block 43.

[0057] The working principle of the lateral support block assembly 4 is as follows: the second hydraulic drive cylinder 41 is started to drive the second sliding block 43 to move forward linearly along the second linear guide groove 421, so that the second sliding block 43 drives the contoured support block 44 to move forward and cooperate with the cold water suction pipe 1 to be processed.

[0058] Preferably, the front end of the profiling support block 44 has an arc section 441, and the rear part of the profiling support block 44 is provided with a positioning oblique socket 442, into which a positioning rod 45 can be inserted. The arc section 441 is adapted to the shape of the outer wall of the cold water extraction tube 1 to increase the contact area and provide a better support and positioning effect; and the cooperation between the positioning rod 45 and the positioning oblique socket 442 can prevent the profiling support block 44 from being forced to retreat, thereby ensuring the position stability of the profiling support block 44 during operation, so as to prevent the cold water extraction tube 1 from being displaced unnecessarily and improve the processing accuracy. It should be noted that the oblique insertion direction of the positioning rod 45 and the movement direction of the profiling support block 44 are interlaced to form a multi-directional locking and positioning effect. In addition, when the lateral support block assembly 4 is reset, the positioning rod 45 needs to be pulled out of the positioning oblique socket 442 to eliminate the limit.

[0059] 3. The specific structural scheme of the expanded extrusion rod assembly 5 is as follows: Figure 8-Figure 9 , including a third hydraulic drive cylinder 51, a third slide seat 52 having a third arc-shaped guide groove 521, a third sliding block 53 slidably arranged in the third arc-shaped guide groove 521 and acted upon by the third hydraulic drive cylinder 51, a second profiling positioning rod 54 fixed to the front end of the third sliding block 53, and an expanded extrusion sleeve rod 55 sleeved on the second profiling positioning rod 54;

[0060] The second contoured positioning rod 54 extends into the cold water extraction tube 1 through the second port 102 and abuts against the first contoured positioning rod 34;

[0061] The flared extrusion sleeve 55 is in a conical shape with a small front and a large rear. The flared extrusion sleeve 55 abuts against and acts on the inner wall of the cold water extraction tube 1 to extrude the second port 102 of the cold water extraction tube 1 into a flared section 103 .

[0062] The working principle of the flaring extrusion rod assembly 5 is as follows: the third hydraulic drive cylinder 51 is started to drive the third sliding block 53 to move forward in an arc shape along the third arc guide groove 521, so that the front part of the forward movement of the third sliding block 53 drives the second contour positioning rod 54 to extend into the cold water suction tube 1 through the second port 102, and the rear part of the forward movement of the third sliding block 53 drives the flaring extrusion sleeve rod 55 to abut against the inner wall of the cold water suction tube 1, so as to extrude the second port 102 of the cold water suction tube 1 into a flared section 103.

[0063] It is worth mentioning that the third hydraulic drive cylinder 51 outputs power in a straight line forward when working, and the third sliding block 53 needs to move forward in an arc shape along the third arc guide groove 521, so it is necessary to realize power steering. In order to realize the above functions, the third hydraulic drive cylinder 51 forms a transmission match with the third sliding block 53 through a Y-shaped rotating joint 56, wherein the fixed end of the Y-shaped rotating joint 56 is connected to the third sliding block 53, and the rotating end of the Y-shaped rotating joint 56 is connected to the third hydraulic drive cylinder 51.

[0064] Embodiment 3

[0065] Based on the structure of any of the above embodiments, this embodiment provides a more preferred tooling structure solution, referring to Figure 3 , Figure 10-11 , specifically:

[0066] 1. A heating wire 24 is also provided in the upper tooling positioning plate 21 and the lower tooling positioning plate 22 . The heating wire 24 is located near the second port 102 of the cold water extraction tube 1 .

[0067] The heating wire 24 is connected to the power supply outside the tooling and powered on to heat the area near the second port 102 of the cold water suction tube 1 to increase the temperature of the second port 102 of the cold water suction tube 1. At high temperature, the second port 102 is more easily extruded by the flaring extrusion rod assembly 5 to form a flared section 103, thereby improving processing accuracy, shortening processing time, and improving the production efficiency of extrusion molding.

[0068] Second, the upper tooling positioning plate 21 and the lower tooling positioning plate 22 are also provided with a heat dissipation channel 25, which is filled with heat dissipation liquid, and the end of the heat dissipation channel 25 is adapted to the end of the flared section 103. After heating and extrusion molding, heat dissipation liquid (such as water-cooled liquid or fluorinated liquid, etc.) is passed into the heat dissipation channel 25 to quickly dissipate heat and cool down the end of the flared section 103, so that the processed cold water suction tube 1 can quickly return to a normal temperature state, so that it is convenient for the staff to take out the product and improve the material discharging efficiency.

[0069] Preferably, the upper tooling positioning plate 21 and / or the lower tooling positioning plate 22 are provided with a liquid inlet and outlet 251 which is the same as the heat dissipation channel 25 to input / output the heat dissipation liquid.

[0070] 3. One of the upper tooling positioning plate 21 and the lower tooling positioning plate 22 is provided with a positioning protrusion 26, and the other is provided with a positioning groove 27, and the positioning protrusion 26 is embedded in the positioning groove 27. Through the cooperation of the positioning protrusion 26 and the positioning groove 27, when the upper tooling positioning plate 21 and the lower tooling positioning plate 22 are closed, a limited fit is formed between the two, thereby preventing the two from loosening and shifting each other, so as to provide a more stable elbow cavity 23, thereby improving the processing accuracy.

[0071] It is worth noting that other technical solutions of the present invention belong to the prior art and will not be described in detail.

[0072] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the concept of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A tool for expanding and forming a cold water suction pipe in a heating system, wherein the cold water suction pipe (1) is in a curved pipe shape, and one end of the cold water suction pipe (1) is a second port (102), and the other end is a first port (101); It is characterized in that The expansion forming tooling includes: A tooling positioning plate assembly (2), comprising an upper tooling positioning plate (21) and a lower tooling positioning plate (22) that can be closed or separated from each other, and when the upper tooling positioning plate (21) and the lower tooling positioning plate (22) are closed, a curved pipe cavity (23) for accommodating a cold water suction pipe (1) is formed between the two. A port positioning rod assembly (3) is movably arranged at one end of the tooling positioning plate assembly (2) close to the first port (101); the port positioning rod assembly (3) can extend into the cold water suction pipe (1) through the first port (101), and the rear end of the port positioning rod assembly (3) can abut against the first port (101) of the cold water suction pipe (1) to form a limiting fit; A lateral support block assembly (4) which is movably arranged on one side of the tooling positioning plate assembly (2), wherein the lateral support block assembly (4) can abut against the outer wall of the cold water extraction pipe (1); A flared extrusion rod assembly (5) is movably arranged at one end close to the second port (102). The flared extrusion rod assembly (5) is in the shape of a cone with a small front and a large rear. The flared extrusion rod assembly (5) can extend into the cold water suction pipe (1) through the second port (102) and form an interference fit with the second port (102) of the cold water suction pipe (1), so as to extrude the second port (102) of the cold water suction pipe (1) to form a flared section (103).

2. The expansion forming tool for the cold water suction pipe in the heating system according to claim 1, characterized in that: The port positioning rod assembly (3) comprises a first hydraulically driven cylinder (31), a first slide seat (32) having a first linear guide groove (321), a first sliding block (33) slidably arranged in the first linear guide groove (321) and acted upon by the first hydraulically driven cylinder (31), and a first contoured positioning rod (34) fixed to the front end of the first sliding block (33).

3. The expansion forming tool for the cold water suction pipe in the heating system according to claim 2, characterized in that: The first contoured positioning rod (34) comprises a small-diameter rod section (341) and a large-diameter rod section (342); the small-diameter rod section (341) extends into the cold water extraction pipe (1) through the first port (101); and the large-diameter rod section (342) abuts against the first port (101) of the cold water extraction pipe (1) to form a limiting fit.

4. The expansion forming tool for the cold water suction pipe in the heating system according to claim 1, characterized in that: The lateral support block assembly (4) comprises a second hydraulically driven cylinder (41), a second slide seat (42) having a second linear guide groove (421), a second sliding block (43) slidably arranged in the second linear guide groove (421) and acted upon by the second hydraulically driven cylinder (41), and a contoured support block (44) fixed at the front end of the second sliding block (43).

5. The expansion forming tool for the cold water suction pipe in the heating system according to claim 4, characterized in that: The front end of the profiling support block (44) has an arc section (441), and the rear part of the profiling support block (44) is provided with a positioning oblique insertion hole (442), and a positioning rod (45) can be inserted into the positioning oblique insertion hole (442).

6. The expansion forming tool for the cold water suction pipe in the heating system according to claim 2, characterized in that: The flaring extrusion rod assembly (5) comprises a third hydraulically driven cylinder (51), a third slide seat (52) having a third arc-shaped guide groove (521), a third sliding block (53) slidably arranged in the third arc-shaped guide groove (521) and acted upon by the third hydraulically driven cylinder (51), a second profiling positioning rod (54) fixed at the front end of the third sliding block (53), and a flaring extrusion sleeve rod (55) sleeved on the second profiling positioning rod (54); The second contoured positioning rod (54) extends into the cold water extraction pipe (1) through the second port (102) and abuts against the first contoured positioning rod (34); The flared extrusion sleeve (55) is in the shape of a cone with a small front and a large rear. The flared extrusion sleeve (55) abuts against and acts on the inner wall of the cold water extraction tube (1) to extrude the second port (102) of the cold water extraction tube (1) to form a flared section (103).

7. The expansion forming tool for the cold water suction pipe in the heating system according to claim 6, characterized in that: The third hydraulic drive cylinder (51) forms a transmission cooperation with the third sliding block (53) through a Y-shaped rotating joint (56), wherein the fixed end of the Y-shaped rotating joint (56) is connected to the third sliding block (53), and the rotating end of the Y-shaped rotating joint (56) is connected to the third hydraulic drive cylinder (51).

8. The expansion forming tool for the cold water suction pipe in the heating system according to any one of claims 1 to 7, characterized in that: The upper tooling positioning plate (21) and the lower tooling positioning plate (22) are also provided with a heating wire (24), and the heating wire (24) is located near the second port (102) of the cold water extraction pipe (1).

9. The expansion forming tool for the cold water suction pipe in the heating system according to claim 8, characterized in that: The upper tooling positioning plate (21) and the lower tooling positioning plate (22) are also provided with heat dissipation channels (25), the heat dissipation channels (25) are filled with heat dissipation liquid, and the ends of the heat dissipation channels (25) are adapted to the ends of the flared sections (103).

10. The expansion forming tool for the cold water suction pipe in the heating system according to claim 1, characterized in that: One of the upper tooling positioning plate (21) and the lower tooling positioning plate (22) is provided with a positioning protrusion (26), and the other is provided with a positioning groove (27), and the positioning protrusion (26) is embedded in the positioning groove (27).

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