Pipe expanding device and pipe expanding method

Abstract

The application discloses a pipe expanding device and a pipe expanding method, and relates to the technical field of pipe processing. The pipe expanding device comprises a rack, a preheating mechanism, a clamping mechanism, a translation mechanism and a core mold. The preheating mechanism, the clamping mechanism and the translation mechanism are all installed on the rack, the translation mechanism is connected with the core mold, the preheating mechanism is used for preheating the port section of the pipe, the clamping mechanism is used for clamping and fixing the preheated pipe, so that the pipe and the core mold are coaxially and spacedly arranged, the translation mechanism is used for driving the core mold to insert into the pipe from the port section, so as to expand the port section along the radial direction outward, the core mold is provided with a locking assembly, and the locking assembly is used for locking the expanded port section, so as to prevent the port section from being retracted along the axial direction. The pipe expanding device provided by the application can prevent the port section of the pipe from being axially retracted in the subsequent pipe forming process, ensure the strength, toughness and impact resistance of the expanded pipe, improve the yield, and ensure the product stability.

Description

Technical Field

[0001] This invention relates to the field of pipe processing technology, and more specifically, to a pipe flaring device and a flaring method thereof. Background Technology

[0002] Currently, in the flaring process of pipes, one end of the pipe is typically heated and softened before being inserted into a flaring mold. This allows the heated end to expand during insertion, followed by pipe forming. However, for biaxially oriented polyvinyl chloride (PVC-O) pipes, the biaxial orientation structure shrinks and loses its orientation characteristics during high-temperature heating, and may even be axially compressed. This significantly reduces the strength, toughness, and impact resistance of the subsequently formed socket section, resulting in a high defect rate and unstable product performance.

[0003] In view of this, designing a pipe flaring device and flaring method that can prevent shrinkage is particularly important in pipe processing. Summary of the Invention

[0004] The purpose of this invention is to provide a pipe flaring device that can prevent the end section of the pipe from axially shrinking during the subsequent pipe forming process, ensuring the strength, toughness and impact resistance of the flared pipe, improving the yield rate and ensuring product stability.

[0005] Another objective of this invention is to provide a flaring method for a pipe flaring device, which can prevent the end section of the pipe from axially shrinking during subsequent pipe forming, ensuring the strength, toughness, and impact resistance of the flared pipe, improving the yield rate, and ensuring product stability.

[0006] The present invention is achieved by the following technical solution.

[0007] A pipe flaring device includes a frame, a preheating mechanism, a clamping mechanism, a translation mechanism, and a mandrel. The preheating mechanism, clamping mechanism, and translation mechanism are all mounted on the frame. The translation mechanism is connected to the mandrel. The preheating mechanism is used to preheat the end section of the pipe. The clamping mechanism is used to clamp and fix the preheated pipe so that the pipe and the mandrel are coaxial and spaced apart. The translation mechanism is used to drive the mandrel to be inserted into the pipe from the end section to flare the end section radially outward. The mandrel is provided with a locking component to lock the flared end section to prevent the end section from retracting axially.

[0008] Optionally, the core mold includes a core mold body and a molding insert. The molding insert is fitted outside the core mold body and is fixedly connected to the core mold body. The molding insert and the core mold body together form a molding groove. The core mold body is used to insert the pipe and to push the end segment outward during the insertion process. The molding groove is used to allow the end segment to extend into the molding. The locking component is installed on the core mold body and / or the molding insert.

[0009] Optionally, the locking assembly includes a cooling channel disposed within the core mold body. The cooling channel is positioned corresponding to the molding groove. The cooling channel is used to supply cooling water to cool the end section within the molding groove, causing it to contract radially and fit tightly against the core mold body.

[0010] Optionally, the locking assembly includes a first pneumatic expansion ring, the molding insert has an installation groove that communicates with the molding groove, the first pneumatic expansion ring is installed in the installation groove, and the first pneumatic expansion ring is used to expand after inflation to press the end section in the molding groove against the core mold body.

[0011] Optionally, the core mold body includes a first mold segment, a second mold segment, a third mold segment, a first heat insulation pad, and a second heat insulation pad. The first mold segment, the second mold segment, and the third mold segment are connected in sequence. The first heat insulation pad is disposed between the first mold segment and the second mold segment. The second heat insulation pad is disposed between the second mold segment and the third mold segment. The third mold segment is connected to the translation mechanism. The molding insert is sleeved on the outside of the third mold segment.

[0012] Optionally, the pipe flaring device further includes a sliding mechanism and a heater. The sliding mechanism is mounted on the frame and connected to the heater. The heater is located between the clamping mechanism and the mandrel. The sliding mechanism is used to drive the heater to a preset position so that the heater heats the socket section of the pipe, wherein the socket section is located inside the port section.

[0013] Optionally, a heating module is provided inside the core mold, the position of which corresponds to the position of the socket section, and the heating module is used to heat the socket section.

[0014] Optionally, the pipe flaring device also includes a forming mold, which is connected to the sliding mechanism and disposed between the heater and the clamping mechanism. The sliding mechanism is used to drive the forming mold to a preset position after the socket section is heated. The forming mold is used to close the mold and form a cavity so that the socket section is placed in the cavity. The core mold is provided with an airflow channel for high-pressure gas to be introduced so that the socket section expands and forms, and fits against the inner surface of the cavity.

[0015] Optionally, a positioning groove is provided on the circumferential surface of the core mold, and a second air pressure expansion ring is provided in the positioning groove. The second air pressure expansion ring is used to expand after inflation to seal the gap between the core mold and the tube, and to prevent the high-pressure gas introduced from the airflow channel from overflowing outward.

[0016] A method for flaring a pipe flaring device, applied to the aforementioned pipe flaring device, the method comprising: preheating the end segment of the pipe using a preheating mechanism; clamping and fixing the pipe using a clamping mechanism; inserting a mandrel into the pipe from the end segment using a translation mechanism to flare the end segment radially outward; and locking the end segment using a locking assembly to prevent the end segment from retracting axially.

[0017] Optionally, after locking the port segment with a locking assembly to prevent the port segment from retracting along its axial direction, the flaring method of the pipe flaring device further includes: using a sliding mechanism to move the heater to a preset position so that the heater heats the socket section of the pipe, wherein the socket section is located inside the port segment.

[0018] Optionally, the heater is moved to a preset position by a sliding mechanism so that the heater heats the socket section of the pipe. After the step of the socket section being located inside the end section, the flaring method of the pipe flaring device further includes: moving the forming mold to a preset position by a sliding mechanism; controlling the forming mold to close and form a cavity so that the socket section is placed in the cavity; and introducing high-pressure gas through the airflow channel of the core mold so that the socket section expands and forms, and fits against the inner surface of the cavity.

[0019] The pipe flaring device and flaring method provided by this invention have the following beneficial effects:

[0020] The pipe flaring device provided by this invention comprises a preheating mechanism, a clamping mechanism, and a translation mechanism all mounted on a frame. The translation mechanism is connected to a mandrel. The preheating mechanism preheats the end section of the pipe, and the clamping mechanism clamps and fixes the preheated pipe to ensure that the pipe and mandrel are coaxial and spaced apart. The translation mechanism drives the mandrel to be inserted into the pipe from the end section, thus flaring the end section radially outward. The mandrel is equipped with a locking component to lock the flared end section and prevent it from retracting axially. Compared with the prior art, the pipe flaring device provided by this invention, due to the use of a mandrel connected to the translation mechanism and a locking component on the mandrel, can prevent the end section of the pipe from axially retracting during subsequent pipe forming, ensuring the strength, toughness, and impact resistance of the flared pipe, improving yield, and ensuring product stability.

[0021] The flaring method of the pipe flaring device provided by the present invention, applied to the pipe flaring device, can prevent the end section of the pipe from axially shrinking during the subsequent pipe forming process, ensuring the strength, toughness and impact resistance of the flared pipe, improving the yield rate and ensuring product stability. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the pipe flaring device provided in an embodiment of the present invention;

[0024] Figure 2 This is a cross-sectional view of the pipe flaring device provided in an embodiment of the present invention;

[0025] Figure 3 This is a cross-sectional view of the pipe flaring device provided in an embodiment of the present invention when heating the socket section of the pipe.

[0026] Figure 4 A cross-sectional view of the pipe flaring device provided in an embodiment of the present invention during the flaring of the socket section of a pipe.

[0027] Figure 5 A schematic diagram of the structure of the pipe before flaring in which the pipe flaring device provided in this embodiment of the invention is applied;

[0028] Figure 6 A schematic diagram of the structure of the pipe used in the pipe flaring device provided in the embodiment of the present invention when the flaring of the end section is completed;

[0029] Figure 7 A schematic diagram of the structure of the pipe used in the pipe flaring device provided in this embodiment of the invention when both the end section and the socket section are flared.

[0030] Figure 8 A cross-sectional view of the preheating mechanism in the pipe flaring device provided in an embodiment of the present invention;

[0031] Figure 9 This is a cross-sectional view of the core mold in the pipe flaring device provided in an embodiment of the present invention.

[0032] Icons: 100 - Pipe flaring device; 110 - Frame; 120 - Preheating mechanism; 121 - Preheating rigid body; 122 - Electric heating rod; 123 - Preheating tank; 130 - Clamping mechanism; 140 - Translation mechanism; 150 - Core mold; 151 - Locking assembly; 1511 - Cooling water channel; 1512 - First air pressure expansion ring; 152 - Core mold body; 1521 - First mold section; 1522 - Second mold section; 1523 - Third mold section; 1524 - First heat insulation pad; 1525 - Second... 153-Insulation pad; 1531-Mounting groove; 154-Molding groove; 155-Airflow channel; 156-Fluid filter element; 157-Positioning groove; 158-Second air pressure expansion ring; 159-Heating module; 160-Sliding mechanism; 170-Heater; 180-Molding die; 182-Mounting bracket; 183-First driving component; 184-Second driving component; 185-Upper template; 186-Lower template; 200-Pipe; 210-Port section; 220-Socket section. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0035] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0036] In the description of this invention, it should be noted that the terms "inner," "outer," "upper," "lower," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0037] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," "installed," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0038] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, features in the following embodiments can be combined with each other.

[0039] Please refer to the reference. Figures 1 to 9 This invention provides a pipe flaring device 100 for flaring pipes 200. It prevents the end section 210 of the pipe 200 from axially shrinking during subsequent pipe forming, ensuring the strength, toughness, and impact resistance of the flared pipe 200, improving yield, and guaranteeing product stability.

[0040] In this embodiment, the pipe flaring device 100 is used for flaring pipe 200, which is a biaxially oriented polyvinyl chloride (PVC-O) pipe. The end of the pipe 200 is sequentially provided with a port section 210 and a socket section 220. Both the port section 210 and the socket section 220 need to be flared, with the socket section 220 located inside the port section 210. However, this is not the only embodiment. In other embodiments, the pipe flaring device 100 can also be used for flaring pipe 200 made of other materials, without specific limitations on the material of the pipe 200.

[0041] The pipe flaring device 100 includes a frame 110, a preheating mechanism 120, a clamping mechanism 130, a translation mechanism 140, a mandrel 150, a sliding mechanism 160, a heater 170, and a forming mold 180. The preheating mechanism 120, clamping mechanism 130, and translation mechanism 140 are all mounted on the frame 110, and the translation mechanism 140 is connected to the mandrel 150. The preheating mechanism 120 preheats the end section 210 of the pipe 200 to soften it, facilitating flaring deformation. The clamping mechanism 130 clamps and fixes the preheated pipe 200, ensuring that the pipe 200 and mandrel 150 are coaxial and spaced apart. The end section 210 of the pipe 200 is positioned close to the mandrel 150 to allow the mandrel 150 to be inserted into the pipe 200 through the end section 210. The translation mechanism 140 is used to drive the mandrel 150 to be inserted into the tube 200 from the end segment 210, thereby expanding the end segment 210 radially outward to achieve the flaring function of the end segment 210. When the mandrel 150 is inserted into the tube 200 for a certain length, the flaring of the end segment 210 is completed. After that, the translation mechanism 140 remains stationary, and the mandrel 150 supports and positions the end segment 210. The mandrel 150 and the clamping mechanism 130 work together to further fix the position of the tube 200 and prevent the tube 200 from shifting or rotating. Specifically, the mandrel 150 is provided with a locking component 151, which is used to lock the flared end segment 210 to prevent the end segment 210 from shrinking back along its axis during the subsequent tube 200 forming process, ensuring the strength, toughness, and impact resistance of the flared tube 200, improving the yield rate, and ensuring product stability.

[0042] The preheating mechanism 120 includes a preheating rigid body 121 and an electric heating rod 122. The electric heating rod 122 is embedded in the preheating rigid body 121, and the preheating rigid body 121 has a preheating groove 123 for inserting the end section 210 of the pipe 200. The end section 210 is tightly fitted with the preheating groove 123, and the electric heating rod 122 is used to heat the end section 210 after being energized. Specifically, during the preheating process of the port segment 210, the electric heating rod 122 is energized and generates heat, which is transferred to the port segment 210 through the preheating rigid body 121 to achieve contact heating of the port segment 210. During this process, since the port segment 210 is tightly fitted with the preheating tank 123, the preheating rigid body 121 can suppress the port segment 210 from shrinking inward along its axial direction. After the preheating mechanism 120 heats the port segment 210 to a temperature suitable for plastic deformation, the port segment 210 is pulled out of the preheating tank 123, and the entire pipe 200 is transferred to the clamping mechanism 130.

[0043] It should be noted that the sliding mechanism 160 is mounted on the frame 110 and connected to the heater 170. The heater 170 is positioned between the clamping mechanism 130 and the mandrel 150. The sliding mechanism 160 is used to move the heater 170 to a preset position so that the heater 170 heats the socket section 220 of the pipe 200, thereby softening the socket section 220 and facilitating its flaring deformation. Specifically, during the high-temperature heating of the socket section 220 by the heater 170, the biaxial orientation structure in the socket section 220 will lose its orientation characteristics and have an axial retraction tendency (towards the direction away from the port section 210). However, since the locking assembly 151 has already locked the port section 210 at this time, the socket section 220 will not axially retract, and there will be no reduction in the performance of the socket section 220, thus ensuring the yield rate.

[0044] In this embodiment, the heater 170 is a far-infrared heater 170. The heater 170 is annular, and the pipe 200 passes through the heater 170. When the heater 170 moves to a preset position, it can uniformly heat the outer circumferential surface of the socket section 220 of the pipe 200, ensuring the uniformity of the temperature rise of the socket section 220 and improving the flaring effect of the subsequent socket section 220.

[0045] Furthermore, a heating module 159 is provided inside the mandrel 150. The position of the heating module 159 corresponds to the position of the socket section 220. The heating module 159 is used to provide auxiliary heating to the socket section 220 to soften it and facilitate its flaring deformation. Specifically, when the mandrel 150 is inserted into the pipe 200 until the end section 210 is flared, the socket section 220 is precisely fitted outside the heating module 159. At this time, the heating module 159 can uniformly heat the inner circumferential surface of the socket section 220 to further improve the uniformity of the temperature rise of the socket section 220. In this embodiment, the heating module 159 is a resistance block and is annular.

[0046] It is worth noting that the molding die 180 is connected to the sliding mechanism 160 and is located between the heater 170 and the clamping mechanism 130. The sliding mechanism 160 is used to drive the molding die 180 to a preset position after the socket section 220 is heated. The molding die 180 is used to close the mold at the preset position and form a cavity (not shown), so that the socket section 220 is placed in the cavity. Specifically, the core mold 150 is provided with an airflow channel 155, which is used to allow high-pressure gas to pass through, so that the socket section 220 expands and forms under the action of high-pressure gas and fits against the inner surface of the cavity, thereby realizing the flaring function of the socket section 220.

[0047] The molding die 180 includes a mounting frame 182, a first driving member 183, a second driving member 184, an upper template 185, and a lower template 186. The mounting frame 182 is connected to the sliding mechanism 160. The first driving member 183 and the second driving member 184 are both mounted on the mounting frame 182. The first driving member 183 is connected to the upper template 185, and the second driving member 184 is connected to the lower template 186. The upper template 185 is arranged parallel to each other above the lower template 186. The sliding mechanism 160 can synchronously drive the first driving member 183, the second driving member 184, the upper template 185, and the lower template 186 to move synchronously through the mounting frame 182. The upper template 185 and the lower template 186 can jointly form the molding cavity when the mold is closed, so as to realize the flaring forming of the socket section 220.

[0048] Specifically, when the sliding mechanism 160 drives the forming mold 180 to move to the preset position, the first driving member 183 drives the upper template 185 to descend, and the second driving member 184 drives the lower template 186 to rise, so that the upper template 185 and the lower template 186 close together, thereby realizing the mold closing function of the forming mold 180, so that the socket section 220 is set in the cavity; after the socket section 220 is expanded, the first driving member 183 drives the upper template 185 to rise, and the second driving member 184 drives the lower template 186 to descend, so that the upper template 185 and the lower template 186 separate, thereby realizing the mold opening function of the forming mold 180, which facilitates the discharge of the pipe 200.

[0049] The core mold 150 includes a core mold body 152 and a molding insert 153. The molding insert 153 is sleeved on the core mold body 152 and fixedly connected to the core mold body 152. The molding insert 153 and the core mold body 152 together form a molding groove 154. The core mold body 152 is connected to the translation mechanism 140. The core mold body 152 is used to insert the tube 200 and, during the insertion process, to push the end segment 210 outward. The molding groove 154 is used to allow the end segment 210 to extend into the molding groove. A locking assembly 151 is installed on the core mold body 152 and / or the molding insert 153. The locking assembly 151 is used to lock the end segment 210 located in the molding groove 154.

[0050] Specifically, the forming groove 154 is annular. During the process of the translation mechanism 140 driving the core mold body 152 to insert the tube 200 from the port segment 210, the core mold body 152 first pushes the port segment 210 outward so that the diameter of the port segment 210 is the same as the diameter of the annular shape of the forming groove 154; then the port segment 210 extends into the forming groove 154; when the free end of the port segment 210 abuts against the side wall of the forming groove 154, the tube 200 moves into place and the port segment 210 is widened. After that, the translation mechanism 140 no longer drives the core mold body 152 to move.

[0051] In this embodiment, the locking assembly 151 is simultaneously installed on both the core mold body 152 and the molding insert 153. The locking assembly 151 is used to simultaneously lock the port segment 210 from both sides of the molding groove 154 to enhance the locking effect and further prevent the port segment 210 from axially retracting. However, it is not limited to this. In other embodiments, the locking assembly 151 may be installed only on the core mold body 152 or only on the molding insert 153. In this case, the locking assembly 151 locks the port segment 210 from one side of the molding groove 154.

[0052] The locking assembly 151 includes a cooling water channel 1511 and a first air pressure expansion ring 1512. The cooling water channel 1511 is disposed inside the core mold body 152, and its position corresponds to the position of the forming groove 154. The cooling water channel 1511 is located inside the forming groove 154 and is used to supply cooling water to cool the port section 210 in the forming groove 154, causing it to shrink radially and fit tightly against the outside of the core mold body 152. In this way, under the cooling effect of the cooling water, the port section 210 shrinks radially and fits tightly against the outside of the core mold body 152. The shrinkage force of the port section 210 itself locks it against the outside of the core mold body 152, preventing the port section 210 from axially retracting during the subsequent flaring and forming of the socket section 220.

[0053] Furthermore, the molding insert 153 has a mounting groove 1531, which communicates with the molding groove 154. A first air pressure expansion ring 1512 is installed in the mounting groove 1531. The first air pressure expansion ring 1512 is used to expand after inflation to press the port segment 210 in the molding groove 154 against the outside of the core mold body 152. In this way, under the pressing action of the first air pressure expansion ring 1512, the port segment 210 is tightly fitted against the outside of the core mold body 152. The pressure of the first air pressure expansion ring 1512 locks the port segment 210 against the outside of the core mold body 152 to prevent the port segment 210 from axially retracting during the subsequent flaring and molding process of the socket segment 220.

[0054] The core mold body 152 includes a first mold segment 1521, a second mold segment 1522, a third mold segment 1523, a first heat insulation pad 1524, and a second heat insulation pad 1525. The first mold segment 1521, the second mold segment 1522, and the third mold segment 1523 are connected sequentially. The first heat insulation pad 1524 is disposed between the first mold segment 1521 and the second mold segment 1522, and is used to insulate heat transfer between the first mold segment 1521 and the second mold segment 1522. The second heat insulation pad 1525 is disposed between the second mold segment 1522 and the third mold segment 1523, and is also used to insulate heat transfer between the second mold segment 1522 and the third mold segment 1523. The third mold segment 1523 is connected to a translation mechanism 140, which can drive the entire core mold body 152 to move via the third mold segment 1523. The molding insert 153 is fitted outside the third module 1523, and the molding insert 153 and the third module 1523 together form the molding groove 154.

[0055] Furthermore, the airflow channel 155 is sequentially arranged through the third module 1523, the second heat insulation pad 1525, and the second module 1522, and an air outlet (not shown) is provided on the circumferential surface of the second module 1522 for high-pressure gas to be blown out. A fluid filter element 156 is provided inside the airflow channel 155. The fluid filter element 156 is located inside the second heat insulation pad 1525 and the second module 1522. The fluid filter element 156 is used to filter and remove impurities from the high-pressure air to improve the cleanliness of the high-pressure gas blown out from the air outlet. The fluid filter element 156 is also used to uniformly disperse the high-pressure gas so that it can uniformly inflate the socket section 220 circumferentially. In this embodiment, the heating module 159 is disposed inside the second module 1522 and sleeved outside the fluid filter element 156 to achieve a reasonable layout of the second module 1522 and reduce the volume of the second module 1522 without affecting functionality.

[0056] Specifically, when the core mold 150 is inserted into the pipe 200 until the port section 210 is flared, the port section 210 is fitted outside the third mold section 1523 and is located inside the forming groove 154, and abuts against the side wall of the forming groove 154; the socket section 220 is fitted outside the second mold section 1522 and covers the air outlet, and corresponds to the position of the heating module 159.

[0057] It is worth noting that a positioning groove 157 is provided on the circumferential surface of the first segment 1521 of the core mold 150. A second air pressure expansion ring 158 is provided in the positioning groove 157. The second air pressure expansion ring 158 is used to expand after inflation to seal the gap between the core mold 150 and the tube 200, and to prevent the high pressure gas introduced from the air flow channel 155 from overflowing outward, thereby ensuring the flaring efficiency and flaring effect.

[0058] Specifically, after the molding die 180 closes at the preset position, the second air pressure expansion ring 158 is first inflated to expand it, thereby sealing the gap between the first mold section 1521 and the pipe 200. Then, high-pressure gas is sequentially introduced between the second mold section 1522 and the socket section 220 through the airflow channel 155 and the air outlet, causing the socket section 220 to expand and deform under the action of air pressure and fit against the inner surface of the cavity. During this process, since the end section 210 is tightly fitted against the outside of the third mold section 1523 under the action of the locking component 151, the gap between the end section 210 and the third mold section 1523 has been sealed. Therefore, the high-pressure gas cannot escape between the second mold section 1522 and the socket section 220, and can only do work on the socket section 220, causing it to expand and deform. The flaring efficiency is high and the flaring effect is good.

[0059] In this embodiment, the translation mechanism 140, the sliding mechanism 160, the first driving member 183, and the second driving member 184 are all hydraulic cylinders, but they are not limited to this. In other embodiments, the translation mechanism 140, the sliding mechanism 160, the first driving member 183, and the second driving member 184 can all be electric cylinders or pneumatic cylinders. The types of the translation mechanism 140, the sliding mechanism 160, the first driving member 183, and the second driving member 184 are not specifically limited.

[0060] This invention also provides a flaring method for a pipe flaring device 100, which is applied to the pipe flaring device 100. The flaring method of the pipe flaring device 100 includes the following steps:

[0061] Step S110: Preheat the end section 210 of the pipe 200 using the preheating mechanism 120.

[0062] It should be noted that in step S110, the end segment 210 of the pipe 200 is inserted into the preheating groove 123 of the preheating rigid body 121, and heated and softened by an electric heating rod 122. The cooperation between the preheating groove 123 and the end segment 210 suppresses the shrinkage deformation of the end segment 210. When the end segment 210 is heated to a temperature suitable for plastic deformation, the end segment 210 is pulled out of the preheating groove 123, completing the preheating process.

[0063] Step S120: Use the clamping mechanism 130 to clamp and fix the pipe 200.

[0064] It should be noted that in step S120, the tube 200 is passed sequentially through the clamping mechanism 130, the forming mold 180, and the heater 170, and the clamping mechanism 130 is used to clamp and fix the tube 200 so that the tube 200 and the mandrel 150 are coaxial and spaced apart. In this embodiment, the axial directions of both the tube 200 and the mandrel 150 are horizontal.

[0065] Step S130: Using the translation mechanism 140 to drive the mandrel 150 to be inserted into the pipe 200 from the port segment 210, so as to expand the port segment 210 radially outward.

[0066] It should be noted that in step S130, the translation mechanism 140 drives the mandrel 150 to move, so that the mandrel 150 is inserted into the tube 200. During this process, the mandrel 150 pushes the end segment 210 outward to realize the flaring function of the end segment 210. When the end segment 210 abuts against the side wall of the forming groove 154, the flaring of the end segment 210 is completed. At this time, the translation mechanism 140 no longer drives the mandrel 150 to move, and the mandrel 150 and the clamping mechanism 130 jointly fix the position of the tube 200.

[0067] Step S140: Lock the port segment 210 using the locking assembly 151 to prevent the port segment 210 from retracting along its axial direction.

[0068] It should be noted that in step S140, cooling water is first introduced into the cooling water channel 1511 of the locking assembly 151 to cause the port segment 210 to shrink radially and fit tightly against the outside of the core mold body 152. At the same time, the port segment 210 is cooled, hardened, and shaped. Then, the first air pressure expansion ring 1512 of the locking assembly 151 is inflated to cause the first air pressure expansion ring 1512 to expand and press the port segment 210 against the outside of the core mold body 152. During this process, since the port segment 210 has been hardened and shaped, it will no longer deform under the pressing action of the first air pressure expansion ring 1512.

[0069] Step S150: The sliding mechanism 160 drives the heater 170 to move to a preset position so that the heater 170 heats the socket section 220 of the pipe 200, wherein the socket section 220 is located inside the port section 210.

[0070] It should be noted that in step S150, the sliding mechanism 160 is first used to drive the heater 170 to move; when the heater 170 moves to the preset position, the sliding mechanism 160 stops; then the heater 170 is started so that the heater 170 heats the socket section 220 evenly, thereby softening the socket section 220; when the socket section 220 is heated to a temperature suitable for plastic deformation, the heater 170 is turned off.

[0071] Step S160: Use the sliding mechanism 160 to drive the forming mold 180 to move to the preset position.

[0072] It should be noted that in step S160, the sliding mechanism 160 is first used to drive the molding die 180 to move; when the molding die 180 moves to the preset position, the sliding mechanism 160 stops, and at this time the position of the molding die 180 corresponds to the position of the socket section 220.

[0073] Step S170: Control the molding die 180 to close and form a cavity so that the socket section 220 is placed inside the cavity.

[0074] It should be noted that in step S170, the first driving member 183 drives the upper template 185 to descend, while the second driving member 184 drives the lower template 186 to rise, so that the molding mold 180 closes. At this time, the upper template 185 and the lower template 186 together surround the molding cavity, and the socket section 220 is set in the cavity.

[0075] Step S180: High-pressure gas is introduced through the airflow channel 155 of the core mold 150 to cause the socket section 220 to expand and form, and fit against the inner surface of the cavity.

[0076] It should be noted that in step S180, high-pressure gas is introduced between the mandrel 150 and the socket section 220 through the airflow channel 155 and the air outlet, so that the socket section 220 expands and is formed under the action of high-pressure gas and fits the inner surface of the cavity, thereby realizing the flaring function of the socket section 220 and completing the flaring operation of the entire pipe 200.

[0077] The pipe flaring device 100 provided in this embodiment of the invention includes a preheating mechanism 120, a clamping mechanism 130, and a translation mechanism 140, all mounted on a frame 110. The translation mechanism 140 is connected to a mandrel 150. The preheating mechanism 120 is used to preheat the end section 210 of the pipe 200. The clamping mechanism 130 is used to clamp and fix the preheated pipe 200 so that the pipe 200 and the mandrel 150 are coaxial and spaced apart. The translation mechanism 140 is used to drive the mandrel 150 to be inserted into the pipe 200 from the end section 210 so as to flare the end section 210 radially outward. The mandrel 150 is provided with a locking component 151, which is used to lock the flared end section 210 to prevent the end section 210 from retracting axially. Compared with the prior art, the pipe flaring device 100 provided by the present invention, by employing a mandrel 150 connected to the translation mechanism 140 and a locking assembly 151 disposed on the mandrel 150, can prevent the end section 210 of the pipe 200 from axially shrinking during the subsequent pipe 200 forming process, thus ensuring the strength, toughness, and impact resistance of the flared pipe 200, improving the yield rate, and ensuring product stability. This results in a flaring method with high efficiency and good flaring effect using the pipe flaring device 100.

[0078] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A pipe flaring device, characterized by, The device includes a frame, a preheating mechanism, a clamping mechanism, a translation mechanism, and a mandrel. The preheating mechanism, the clamping mechanism, and the translation mechanism are all mounted on the frame. The translation mechanism is connected to the mandrel. The preheating mechanism is used to preheat the end section of the pipe. The clamping mechanism is used to clamp and fix the preheated pipe so that the pipe and the mandrel are coaxial and spaced apart. The translation mechanism is used to drive the mandrel to be inserted into the pipe from the end section to expand the end section radially outward. The mandrel is provided with a locking component to lock the expanded end section to prevent the end section from retracting axially. The core mold includes a core mold body and a molding insert. The molding insert is sleeved on the core mold body and fixedly connected to the core mold body. The molding insert and the core mold body together form a molding groove. The core mold body is used to insert the pipe and to push the end segment outward during the insertion process. The molding groove is used to allow the end segment to extend into the molding. The locking assembly is installed on the core mold body and / or the molding insert. The locking assembly includes a first air pressure expansion ring, the molding insert has an installation groove, the installation groove is connected to the molding groove, the first air pressure expansion ring is installed in the installation groove, and the first air pressure expansion ring is used to expand after inflation to press the port segment in the molding groove against the core mold body. A positioning groove is provided on the circumferential surface of the core mold, and a second air pressure expansion ring is provided in the positioning groove. The second air pressure expansion ring is used to expand after inflation to seal the gap between the core mold and the tube.

2. The pipe flaring device according to claim 1, characterized in that, The locking assembly includes a cooling water channel disposed within the core mold body. The position of the cooling water channel corresponds to the position of the molding groove. The cooling water channel is used to supply cooling water to cool the port section within the molding groove, causing it to contract radially and fit tightly against the core mold body.

3. The pipe flaring device according to claim 1, characterized in that, The core mold body includes a first mold segment, a second mold segment, a third mold segment, a first heat insulation pad, and a second heat insulation pad. The first mold segment, the second mold segment, and the third mold segment are connected in sequence. The first heat insulation pad is disposed between the first mold segment and the second mold segment, and the second heat insulation pad is disposed between the second mold segment and the third mold segment. The third mold segment is connected to the translation mechanism, and the molding insert is sleeved on the outside of the third mold segment.

4. The pipe flaring device according to claim 1, characterized in that, The pipe flaring device further includes a sliding mechanism and a heater. The sliding mechanism is mounted on the frame and connected to the heater. The heater is disposed between the clamping mechanism and the mandrel. The sliding mechanism is used to drive the heater to a preset position so that the heater heats the socket section of the pipe, wherein the socket section is located inside the port section.

5. The pipe flaring device according to claim 4, characterized in that, A heating module is provided inside the core mold, and the position of the heating module corresponds to the position of the socket section. The heating module is used to heat the socket section.

6. The pipe flaring device according to claim 4, characterized in that, The pipe flaring device further includes a forming mold, which is connected to the sliding mechanism and disposed between the heater and the clamping mechanism. The sliding mechanism is used to drive the forming mold to the preset position after the socket section is heated. The forming mold is used to close the mold and form a cavity so that the socket section is disposed in the cavity. The core mold is provided with an airflow channel for high-pressure gas to be introduced so that the socket section expands and forms, and fits against the inner surface of the cavity.

7. A flaring method for a pipe flaring device, characterized in that, The pipe flaring device as described in any one of claims 1 to 6, wherein the flaring method of the pipe flaring device comprises: The preheating mechanism is used to preheat the end section of the pipe. The clamping mechanism is used to clamp and fix the pipe. The translation mechanism is used to drive the mandrel to be inserted into the pipe from the port segment, so as to expand the port segment radially outward; The locking assembly is used to lock the port segment to prevent the port segment from retracting along its axial direction.

8. The flaring method of the pipe flaring device according to claim 7, characterized in that, After the step of locking the port segment using the locking assembly to prevent the port segment from retracting along its axial direction, the flaring method of the pipe flaring device further includes: A sliding mechanism is used to move the heater to a preset position so that the heater heats the socket section of the pipe, wherein the socket section is located inside the port section.

9. The flaring method of the pipe flaring device according to claim 8, characterized in that, After the step of using a sliding mechanism to move the heater to the preset position so that the heater heats the socket section of the pipe, wherein the socket section is located inside the end section, the flaring method of the pipe flaring device further includes: The sliding mechanism is used to move the molding die to the preset position; The molding die is controlled to close and form a cavity, so that the socket section is disposed within the cavity; High-pressure gas is introduced through the airflow channel of the core mold to cause the socket section to expand and form, and fit against the inner surface of the cavity.

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