PE pipe hot melting connecting device and connecting method

Abstract

The invention relates to the technical field of pipe connecting equipment, in particular to a PE pipe hot melting connecting device and method. The connecting device comprises a heating tool, the heating tool comprises a heating component and a mounting mechanism, the heating component is mounted on the mounting mechanism, and the mounting mechanism can make the heating component abut against the end of the pipe and drive the heating component away from the end of the pipe in the mounting state; under the working state, the supporting tool can be detachably fixed in the end part of the pipe and sense the temperature of the inner side of the end part of the pipe; wherein the supporting tool and the heating tool are arranged in a linkage mode, under the condition that the supporting tool senses that the temperature of the inner side of the end of the pipe reaches a preset value, the mounting mechanism can be controlled to drive the heating component away from the end of the pipe, and the condition that the temperature of the pipe is too high or too low can be avoided; and the connecting quality of the pipe connecting end is ensured. The connecting method is based on the connecting device, and the connecting quality of the pipe connecting end can be ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipe connecting equipment, in particular to a PE pipe hot melting connecting device and connecting method. BACKGROUND

[0002] PE pipe has the advantages of light weight, convenient installation, long service life, strong durability and good air tightness, and is widely used in municipal engineering such as water supply and drainage. The main connecting methods of PE pipe include hot melting connection, electric melting connection, socket type flexible connection and flange connection, etc., and hot melting connection is one of the common PE pipe connecting methods. The existing PE pipe hot melting connection principle is to tightly attach the mating surface of two PE pipes to the heating tool to heat the flat end surface until melting, and after removing the heating tool, the two melted end surfaces are pressed together, and under the action of pressure, it is kept until the joint is cooled to become a whole.

[0003] Among them, in order to ensure that the two pipes can be reliably connected during the hot melting process, the heating temperature of the pipes needs to be strictly controlled. If the pipe temperature is too high, it will cause excessive melting of the material (more than 260 degrees Celsius), surface oxidation, and even burning and deformation, reducing the strength of the pipe. If the pipe temperature is too low, it will not be fully melted, resulting in insufficient joint strength and easy leakage. SUMMARY

[0004] The present application provides a PE pipe hot melting connecting device and connecting method, which can avoid the situation of too high or too low pipe temperature by sensing the heating temperature of the pipe end through the support tool and driving the heating tool away from the pipe end when the pipe end temperature reaches the preset value, thereby ensuring the connection quality of the pipe connecting end.

[0005] The present application is realized by the following technical solutions:

[0006] In a first aspect, the present application provides a PE pipe hot melting connecting device, comprising: a heating tool comprising a heating component and a mounting mechanism, the heating component being mounted on the mounting mechanism, the mounting mechanism being capable of abutting the heating component against the pipe end and driving the heating component away from the pipe end in the mounting state; a support tool capable of being detachably fixed in the pipe end and sensing the temperature of the inner side of the pipe end in the working state; wherein the support tool and the heating tool are linked and arranged, and in the case that the support tool senses that the temperature of the inner side of the pipe end reaches a preset value, the mounting mechanism can drive the heating component away from the pipe end.

[0007] The PE pipe hot melt connecting device provided by the application comprises a heating tool and a supporting tool. The heating tool comprises a heating component and a mounting mechanism. The mounting mechanism can abut or drive away the heating component from the pipe end. The supporting tool can be fixed in the pipe end and sense the temperature inside the pipe end. The supporting tool is arranged in linkage with the heating tool. In use, the supporting tool is installed in the pipe welding end to support the pipe welding end by the supporting tool, so that the pipe end is not deformed when being cut, and the depth of scraping is uniform, and the welding requirement is met. Meanwhile, the supporting tool can sense the temperature inside the pipe end in real time. Then, the heating component is abutted on the pipe welding end by the mounting mechanism, and the pipe welding end is heated. In the process of increasing the temperature of the pipe welding end, the temperature inside the pipe end also increases. When the supporting tool senses that the temperature inside the pipe end reaches a preset value (at this time, the temperature of the pipe welding end is in the welding temperature threshold range), the mounting mechanism is controlled to drive the heating component away from the pipe end, so that the temperature of the pipe welding end is controlled in the welding temperature threshold range, and the situation that the temperature of the pipe is too high or too low is avoided, and the connection quality of the pipe connecting end is ensured.

[0008] In an optional embodiment of the application, the heating component is provided with two blocks, and the two blocks of the heating component are symmetrically arranged on the two sides of the mounting mechanism, so as to simultaneously heat the welding ends of two PE pipes to be welded by the same heating tool, and ensure the efficiency and synchronization of heating.

[0009] In an optional embodiment of the application, the mounting mechanism comprises a vertical mounting plate and two telescopic cylinders fixed on the corresponding side walls of the vertical mounting plate in the longitudinal direction. The heating component is respectively installed on the piston rod of the corresponding telescopic cylinder, and the supporting tool is provided with two blocks, and the two blocks of the supporting tool are respectively arranged in linkage with the corresponding telescopic cylinder, so as to ensure that the mounting mechanism can abut or drive away the heating component from the pipe end.

[0010] In an optional embodiment of the present application, the supporting tool comprises a supporting disc, a sidewall of which is provided with a mounting ring groove; a supporting liquid bag made of heat-conducting material is sleeved in the mounting ring groove, and when the supporting liquid bag is filled with temperature-sensitive working medium with a set pressure, the supporting liquid bag expands and can fix the supporting disc in the end of the pipe; a connecting rod is fixed in the middle of the supporting disc and is provided with a piston cavity, a pressure-sensing piston is arranged in the piston cavity, the pressure-sensing piston divides the piston cavity into a pressure-sensing cavity and a back pressure cavity, the pressure-sensing cavity is in communication with the inner cavity of the supporting liquid bag; a return spring is used to drive the pressure-sensing piston to return; a travel switch is mounted in the back pressure cavity and is closed when the pressure-sensing piston moves to a corresponding position; wherein the telescopic air cylinder is adapted with an electromagnetic reversing valve, the electromagnetic reversing valve is electrically connected with the travel switch, so as to ensure that the supporting tool can be fixed in the welded end of the PE pipe, can real-time sense the temperature of the inside of the welded end of the pipe, and can be linked to control the mounting mechanism.

[0011] In an optional embodiment of the present application, the travel switch comprises a moving contact point mounted on the pressure-sensing piston; an adjusting screw rod is screwed on the connecting rod and extends along the length direction of the connecting rod; a stationary contact point is mounted on the end of the adjusting screw rod opposite to the moving contact point, so as to ensure that the travel switch is closed when the pressure-sensing piston moves to a corresponding position, and also facilitate to adjust the position of the travel switch to close, so as to adjust the heating temperature of the welded end of the pipe.

[0012] In an optional embodiment of the present application, it further comprises a mounting bracket, one side of the vertical mounting plate is rotatably connected with the mounting bracket, so as to facilitate to move the heating tool into and out of the welded end of the two PE pipes.

[0013] In an optional embodiment of the present application, it further comprises a first pipe clamp fixedly mounted on the mounting bracket for clamping the end of one pipe; a second pipe clamp mounted on the mounting bracket and capable of sliding along the length direction of the mounting bracket for clamping the end of another pipe; a pulling air cylinder fixedly connected with the mounting bracket at one end and connected with the sliding seat of the second pipe clamp at the other end; wherein the clamping center of the first pipe clamp and the clamping center of the second pipe clamp are arranged in line, so as to facilitate to automatically control the two PE pipe welded ends to abut and press together.

[0014] In an optional embodiment of the present application, it further comprises a ring cutting rod, the middle part of the ring cutting rod is detachably mounted on the connecting rod, and the ring cutting rod can rotate around the axis of the connecting rod; both ends of the ring cutting rod in the length direction are provided with cutting edges, the cutting edges are obliquely arranged, and the two cutting edges are symmetrically arranged about the center of the connecting rod, so as to cut off the oxide layer of the welded end of the PE pipe.

[0015] In an alternative embodiment of the present application, an insertion barrel is arranged at one end of the cutting rod, and the insertion barrel is used to insert a crowbar to facilitate the rotation of the cutting rod around the connecting rod by the crowbar.

[0016] In a second aspect, the present application provides a PE pipe hot melt connection method based on the PE pipe hot melt connection device described above, comprising the following steps:

[0017] S10, two support tools are respectively loaded into the welding ends of the corresponding PE pipes, and the support liquid capsules are injected with temperature-sensitive working medium at a set pressure to fix the corresponding support tools;

[0018] S20, the two PE pipes to be connected are respectively fixed in the corresponding first pipe clamp and second pipe clamp;

[0019] S30, the vertical mounting plate is rotated to move the heating components of the heating tool between the welding ends of the two PE pipes;

[0020] S40, the support tool is connected with the heating tool in linkage;

[0021] S50, the two heating components are pressed against the welding ends of the corresponding PE pipes and heated;

[0022] S60, after the support tool controls the heating tool to drive the heating components away from the pipe end, the heating components are removed from between the welding ends of the two PE pipes, and the two support tools are taken out;

[0023] S70, the second pipe clamp is driven to move towards the first pipe clamp, and the two PE pipes are extruded at the welding ends for a set time to complete the connection of the two PE pipes.

[0024] The PE pipe hot melt connection method provided by the present application is based on the PE pipe hot melt connection device described above, the pipe welding end is supported by the support tool, deformation of the pipe end during cutting is avoided, the depth of scraping is not uniform, and the welding requirements cannot be met, the heating components are pressed against the pipe welding end by the installation mechanism, and the welding end is heated, the installation mechanism is controlled in linkage by the support tool when the temperature inside the pipe end reaches the preset value, and the heating components are driven away from the pipe end by the installation mechanism, so that the temperature of the pipe welding end is controlled within the welding temperature threshold range, the situation that the temperature of the pipe is too high or too low can be avoided, and the connection quality of the pipe connection end is ensured.

[0025] Compared with the prior art, the present application has the following advantages and beneficial effects:

[0026] 1. The PE pipe hot melt connecting device provided by the application, which comprises a supporting tool, the supporting tool can be fixed in the end of the pipe and sense the temperature inside the end of the pipe, the pipe welding end is supported by the supporting tool, and deformation of the pipe end during cutting is avoided, so that the depth of scraping is not uniform and the welding requirement cannot be met.

[0027] 2. The PE pipe hot melt connecting device provided by the application, which comprises a heating tool and a supporting tool, the heating tool comprises a heating component and a mounting mechanism, the mounting mechanism can abut or drive away the heating component from the pipe end, and the supporting tool is arranged in linkage with the heating tool, in use, the supporting tool is mounted inside the pipe welding end, the heating component can be abutted on the pipe welding end by the mounting mechanism, and the pipe welding end is heated, in the process of temperature rise of the pipe welding end, the temperature inside the pipe end also rises, when the supporting tool senses that the temperature inside the pipe end reaches a preset value, the mounting mechanism is controlled to be linked, the heating component is driven away from the pipe end by the mounting mechanism, so that the temperature of the pipe welding end is controlled in the welding temperature threshold range, the situation that the temperature of the pipe is too high or too low is avoided, and the connection quality of the pipe connecting end is ensured.

[0028] 3. The PE pipe hot melt connecting method provided by the application, which is based on the PE pipe hot melt connecting device, the pipe welding end is supported by the supporting tool, deformation of the pipe end during cutting is avoided, the depth of scraping is not uniform, and the welding requirement cannot be met, the heating component is abutted on the pipe welding end by the mounting mechanism, and the pipe welding end is heated, when the supporting tool senses that the temperature inside the pipe end reaches a preset value, the mounting mechanism is controlled to be linked, the heating component is driven away from the pipe end by the mounting mechanism, so that the temperature of the pipe welding end is controlled in the welding temperature threshold range, the situation that the temperature of the pipe is too high or too low is avoided, and the connection quality of the pipe connecting end is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0030] In the drawings:

[0031] Figure 1 The front view structural schematic diagram of the PE pipe hot melt connecting device provided by the embodiment of the application;

[0032] Figure 2 The structural schematic diagram of the heating tool provided by the embodiment of the application;

[0033] Figure 3 The support tool and the structure schematic diagram of the support tool after assembling the ring cutting rod provided by the embodiment of the present application are shown in the figure.

[0034] Figure 4 The structure schematic diagram of the support tool provided by the embodiment of the present application is shown in the figure.

[0035] Figure 5 The gas circuit principle structure schematic diagram of the PE pipe hot melt connecting device provided by the embodiment of the present application is shown in the figure.

[0036] The figure mark and the corresponding component name in the figure are shown in the table.

[0037] 10-heating component, 20-mounting mechanism, 21-vertical mounting plate, 22-telescopic air cylinder, 23-electromagnetic reversing valve, 30-support tool, 31-support disc, 32-support liquid bag, 33-connecting rod, 33a-limiting ring, 34-pressure sensing piston, 35-pressure sensing cavity, 36-back pressure cavity, 37-return spring, 38-travel switch, 38a-static contact, 38b-moving contact, 38c-adjusting screw, 40-mounting bracket, 50-first pipe clamp, 60-second pipe clamp, 70-pulling air cylinder, 71-control valve, 80-ring cutting rod, 81-cutting edge, 82-insertion cylinder, 83-limiting thrust bearing. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the figures in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments of the present application. The components of the embodiments of the present application described and shown in the figures herein can be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of the present application provided in the figures is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of the present application.

[0040] It should be noted that: similar marks and letters represent similar items in the following figures, therefore, once an item is defined in one figure, it does not need to be further defined and explained in the subsequent figures. The embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0041] In the description of the embodiments of the present application, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product of the application is used, or the orientation or positional relationship commonly understood by those skilled in the art, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0042] In the description of the present application, unless otherwise explicitly specified and limited, the terms "set", "mount", "connect", "connect" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0043] It should be noted that the butt joint temperature of the PE pipe hot melt connection needs to be controlled in the range of 200-230 degrees Celsius. One optional temperature control method is to set the heating temperature through the welding machine, and to correct the temperature of the surface of the heating component through the contact thermometer during welding. However, the heating component is a non-homogeneous component, and the temperature of each region is not the same, and the region contacted by the pipe and the heating component is also not the same each time, and only the temperature of the heating component is measured, and the temperature of the PE pipe cannot be accurately obtained. The temperature of the PE pipe is usually lower than that of the heating component, and the above method is difficult to accurately control the welding temperature. At the same time, before electric melting welding, the surface oxidation layer of the PE pipe end face must be removed, and the most direct method is to use a manual scraper to scrape the pipe, which not only has low construction efficiency and high labor intensity, but also seriously affects the construction period and the welding quality of the pipe; in addition, a mechanical scraper can also be used for scraping, but due to the soft and elastic texture of the PE pipe, the pipe is deformed during scraping, so that the scraping depth is not the same, the flatness of the welding end face is low, and the welding requirements cannot be met, which seriously affects the overall construction progress and effect.

[0044] To solve the above problems, the inventors innovatively designed the following technical solutions, and the specific implementation schemes of the present application will be described in detail below with reference to the accompanying drawings.

[0045] Embodiment 1

[0046] In combination Figure 1This embodiment provides a PE pipe hot-melt connection device, including: a heating fixture, including a heating component 10 and an installation mechanism 20, wherein the heating component 10 is mounted on the installation mechanism 20, and the installation mechanism 20, in the installed state, can press the heating component 10 against the end of the pipe and drive the heating component 10 away from the end of the pipe; and a support fixture 30, which, in the working state, can be detachably fixed inside the end of the pipe and can sense the temperature inside the end of the pipe; wherein the support fixture 30 is linked to the heating fixture, and when the support fixture 30 senses that the temperature inside the end of the pipe reaches a preset value, it can control the installation mechanism 20 to drive the heating component 10 away from the end of the pipe.

[0047] Understandably, during the hot-melt connection of PE pipes, the ends of both PE pipes need to be heated simultaneously. This can be achieved using a single heater to precisely control the heating temperature of each pipe, or by using two separate heaters to heat the ends of the corresponding PE pipes to ensure synchronous heating. In this embodiment, two heating components 10 are provided, symmetrically arranged on both sides of the mounting mechanism 20. This allows for simultaneous heating of the welding ends of the two PE pipes to be welded using the same heating fixture, ensuring heating efficiency and synchronous heating.

[0048] In this embodiment, the heating component 10 is a centrally located annular structure with a protrusion located in the central channel of the pipe during the heating process. This ensures that the heating component 10 contacts the pipe at a set distance each time, heats the inner wall of the pipe, and brings it closer to the support fixture 30. On the other hand, it facilitates the installation of the protruding parts of the support fixture 30 and the linkage between the support fixture 30 and the heating fixture.

[0049] Combination Figure 2 The installation mechanism 20 includes: a vertical mounting plate 21; two telescopic cylinders 22, which are longitudinally fixed to the corresponding sidewalls of the vertical mounting plate 21; wherein the heating components 10 are respectively mounted on the piston rods of the corresponding telescopic cylinders 22, and two support fixtures 30 are provided, which are respectively linked with the corresponding telescopic cylinders 22 to ensure that the installation mechanism 20 can heat the components 10 to contact or drive away the pipe end.

[0050] Generally, the telescopic cylinder 22 is a sliding cylinder, which is not only small in size but also has high motion precision, facilitating the installation of the telescopic cylinder 22 and preventing the heating element 10 from deviating. At the same time, a heat insulation pad (such as an asbestos pad) is provided at the end of the piston rod of the telescopic cylinder 22 to prevent the heat generated by the heating element 10 from being transferred to the telescopic cylinder 22 in large quantities. Using two telescopic cylinders 22 to install the corresponding heating element 10 can ensure that each heating element 10 retracts after the corresponding PE pipe is heated to the set temperature. It also facilitates the linkage control of the telescopic cylinder 22 through the corresponding support fixture 30.

[0051] Combined again Figure 1 The system also includes a mounting bracket 40, one side of which is rotatably connected to the vertical mounting plate 21 to facilitate the movement of the heating fixture between the welding ends of the two PE pipes. Specifically, the mounting bracket 40 typically consists of multiple guide rods and a base arranged in parallel, with fixed seats at both ends of the base, forming the mounting bracket 40 through the guide rods, fixed seats, and base. Correspondingly, a hinge seat is provided at the bottom of the vertical mounting plate 21, fixedly mounted in the middle of the guide rods, while the lower part of the vertical mounting plate 21 is hinged to the hinge seat via lugs, allowing the vertical mounting plate 21 to rotate relative to the mounting bracket 40.

[0052] Combination Figure 3 The support fixture 30 includes: a support plate 31 with a mounting annular groove on its side wall; a support liquid bladder 32, made of thermally conductive material, fitted inside the mounting annular groove, which expands and secures the support plate 31 to the end of the pipe when a temperature-sensitive working fluid at a set pressure is injected into the support liquid bladder 32; and a connecting rod 33, fixed to the middle of the support plate 31 and having a piston chamber, wherein a pressure-sensing piston 34 is disposed within the piston chamber, dividing the piston chamber into a pressure-sensing chamber 35 and a back pressure chamber 36. The pressure-sensing chamber 35 is connected to the inner cavity of the support liquid bladder 32; the return spring 37 is used to drive the pressure-sensing piston 34 to return to its original position; the limit switch 38 is installed in the back pressure chamber 36 and closes when the pressure-sensing piston 34 moves to the corresponding position; wherein, the telescopic cylinder 22 is equipped with an electromagnetic reversing valve 23, the electromagnetic reversing valve 23 is electrically connected to the limit switch 38 to ensure that the support fixture 30 can be fixed in the welding end of the PE pipe, can sense the temperature inside the welding end of the pipe in real time, and can control the installation mechanism 20 in linkage.

[0053] Specifically, the support plate 31 is made of metal and does not contact the heating element 10 during operation. However, it can slowly heat up under the thermal radiation of the heating element 10. The grooves on both sides of the mounting ring groove can also support the sidewalls of the pipe and limit the position of the support liquid bladder 32. The support liquid bladder 32 is made of flexible, thermally conductive material. During operation, it expands radially under the hydraulic pressure of the internal temperature-sensing medium, thereby fixing the support plate 31 inside the pipe and supporting the end of the pipe. It only contacts the groove wall and bottom of the mounting ring groove and the sidewall of the non-heated section of the pipe. Therefore, its operating temperature is low (not exceeding 100 degrees Celsius) and it can be made of thermally conductive silicone. The corresponding temperature-sensing medium can be ammonia, ethylene glycol aqueous solution, kerosene, etc. Meanwhile, the connecting rod 33 is coaxially arranged with the support plate 31. A flow channel connecting the support liquid bladder 32 and the pressure sensing chamber 35 is provided in the middle of the support plate 31, so that the temperature-sensing working fluid in the support liquid bladder 32 can expand after being heated, pushing the pressure-sensing piston 34 to move towards the limit switch 38 and driving the return spring 37 to store energy. The electromagnetic reversing valve 23 is connected to the compressed air source, so that the extension and retraction of the telescopic cylinder 22 can be switched by the action of the electromagnetic reversing valve 23. When the limit switch 38 is closed, a reversing electrical signal is input to the electromagnetic reversing valve 23, thereby realizing the linkage between the support fixture 30 and the heating fixture.

[0054] It should be noted that PE pipes have a relatively low thermal conductivity. While it can conduct heat, its guiding efficiency is low. Therefore, when the heating element 10 heats the end of the pipe, less heat is transferred to the outer periphery of the support liquid bladder 32. At the same time, the end of the support plate 31 is spaced apart from the boss of the heating element 10, and the connecting rod 33 is spaced apart from the through hole in the middle of the heating element 10. Only a small portion of the heat is transferred to the support liquid bladder 32. Although the relationship between the next trigger position of the stroke and the temperature of the PE pipe welding end can be derived through mathematical models and empirical summaries, thereby determining the trigger position of the limit switch 38, the total amount of heat is related to the ambient temperature of the working environment. During construction, it is necessary to confirm and adjust according to the construction environment. That is, before formal connection, it is necessary to determine whether the temperature of the pipe end is within the welding temperature threshold range when the heating element 10 is removed from the pipe end, and adjust the trigger position of the limit switch 38 according to the test structure.

[0055] In this regard, combined with Figure 4The limit switch 38 provided in this embodiment includes: a moving contact 38b, mounted on the pressure-sensing piston 34; an adjusting screw 38c, screwed onto the connecting rod 33 and extending along the length of the connecting rod 33; and a stationary contact 38a, mounted on the end of the adjusting screw 38c directly opposite the moving contact 38b, to ensure that the limit switch 38 closes when the pressure-sensing piston 34 moves to the corresponding position. It also facilitates the rotation of the adjusting screw 38c to adjust the closed position of the limit switch 38, thereby adjusting the heating temperature of the pipe welding end and ensuring that the temperature of the pipe end is within the welding temperature threshold range. The adjusting screw 38c is an internal hexagonal bolt, and a stepped hole is provided in the middle of the connecting rod 33, the length of which covers the entire adjusting stroke of the adjusting screw 38c.

[0056] Combination Figure 1 and Figure 5 This embodiment also includes: a first pipe clamp 50, fixedly installed on the mounting bracket 40, for clamping the end of one pipe; a second pipe clamp 60, installed on the mounting bracket 40, capable of sliding along the length of the mounting bracket 40, for clamping the end of another pipe; a pulling cylinder 70, one end of which is fixedly connected to the fixed seat of the mounting bracket 40, and the other end of which is connected to the sliding seat of the second pipe clamp 60, and is equipped with a control valve 71 (generally a two-position four-way solenoid valve); wherein, the clamping center of the first pipe clamp 50 and the clamping center of the second pipe clamp 60 are collinearly arranged to facilitate automatic control of the welding ends of the two PE pipes to abut and press together.

[0057] Based on this, combined Figure 3 This embodiment also includes a circumferential cutting rod 80, the middle part of which is detachably mounted on the connector, and the circumferential cutting rod 80 is rotatable about the axis of the connecting rod 33. Both ends of the circumferential cutting rod 80 are provided with cutting edges 81, which are inclined and symmetrically arranged about the center of the connecting rod 33 to facilitate the removal of the oxide layer from the welded end of the PE pipe. Compared to using an electric drive mechanism to drive the cutting edges 81 to move in a ring, the structure is simpler, requires less construction space, and facilitates pipe connection construction.

[0058] To ensure the stability of the circumferential cutting rod 80 during rotation, a limiting ring 33a is screwed onto the connecting rod 33 in this embodiment. Thus, after the circumferential cutting rod 80 is fitted onto the connecting rod 33, the limiting ring 33a is connected to the connecting rod 33, and a limiting thrust bearing 83 is directly set at the middle of the limiting ring 33a and the circumferential cutting rod 80. By rotating the limiting ring 33a, the cutting edge 81 is inserted into the end of the pipe. During the rotation of the circumferential cutting rod 80, the axial position of the cutting edge 81 remains unchanged during rotation due to the reaction force of the limiting thrust bearing 83 and the end of the pipe, thereby ensuring that the flatness of the cut end face meets the welding requirements.

[0059] Correspondingly, an insertion cylinder 82 is provided at one end of the ring-cutting rod 80. The insertion cylinder 82 is used to insert a pry bar so that the ring-cutting rod 80 can be driven to rotate around the connecting rod 33 by the pry bar.

[0060] The PE pipe hot-melt connection device provided in this embodiment undergoes a verification test at the welding site before use to ensure that the welding temperature at the end of the PE pipe is within the welding temperature threshold range when the telescopic cylinder 22 is contracted. During use, the support liquid bladder 32 is first installed in the mounting ring groove, and its inner cavity is connected to the pressure sensing chamber 35. Then, two sets of support fixtures 30 are installed into the corresponding pipe welding ends. The support liquid bladder 32 is filled with a temperature-sensing working fluid at a set pressure through the working fluid filling system, causing the support liquid bladder 32 to expand, thereby fixing the support fixture 30 inside the end of the PE pipe. Then, the positions of the two PE pipes assembled with the support fixtures 30 are fixed by the first pipe clamp 50 and the second pipe clamp 60, respectively. The ring-cutting rod 80 is installed outside the connecting rod 33. The ring-cutting rod 80 is rotated (rotation angle greater than 180 degrees) by a pry bar to cut the welding end of the PE pipe flat, and then the ring-cutting rod 80 is removed.

[0061] After the ring-cutting rod 80 is removed, the vertical mounting plate 21 is rotated so that the boss of the heating component 10 is aligned with the pipe opening of the PE pipe. The limit switch 38 is electrically connected to the corresponding solenoid valve 23, and the heating component 10 is energized to preheat to the heating temperature. The solenoid valve then activates the telescopic cylinder 22, which receives air pressure to push the heating component 10 to the pipe opening of the corresponding PE pipe, thus heating the end of the PE pipe. During the heating process, the temperature-sensing working fluid in the support liquid bladder 32 expands due to heat, continuously pushing the pressure-sensing piston 34 toward the limit switch 38 and causing the return spring 37 to store energy. When the temperature reaches the set threshold, the limit switch 38 triggers a switching electrical signal to the solenoid valve 23, controlling the solenoid valve 23 to switch, causing the telescopic cylinder 22 to retract, thereby retracting the heating component 10.

[0062] After the heating component 10 retracts, the vertical mounting plate 21 is rotated and the support fixture 30 is removed. Compressed gas is input to the pulling cylinder 70 through the control reversing valve, thereby driving the second pipe clamp 60 to move towards the first pipe clamp 50 through the pulling cylinder 70, so as to automatically control the welding ends of the two PE pipes to press against each other and then complete the heat fusion connection of the PE pipes.

[0063] In summary, the PE pipe hot-melt connection device provided in this embodiment has a flush cut at the welding end of the PE pipe, which can avoid the pipe temperature being too high or too low, thereby ensuring the connection quality of the pipe connection end.

[0064] Example 2

[0065] Combination Figure 1 This embodiment provides a method for hot-melt connection of PE pipes, based on the hot-melt connection device for PE pipes described in Embodiment 1, including the following steps:

[0066] S10. Insert the two support fixtures 30 into the welding ends of the corresponding PE pipes, and inject the temperature-sensing working fluid at a set pressure into the support liquid bladder 32 to fix the corresponding support fixtures 30.

[0067] Specifically, a verification test is first conducted at the welding site to ensure that the welding temperature at the end of the PE pipe is within the welding temperature threshold range when the telescopic cylinder 22 is contracted. Then, the support liquid bladder 32 is installed in the installation ring groove, and its inner cavity is connected to the pressure sensing chamber 35. Next, the two sets of support fixtures 30 are installed into the corresponding pipe welding ends. Through the working fluid filling system, the support liquid bladder 32 is filled with a temperature-sensing working fluid at a set pressure, causing the support liquid bladder 32 to expand, thereby fixing the support fixture 30 inside the end of the PE pipe.

[0068] S20. Fix the two PE pipes that need to be connected into the corresponding first clamp 50 and second clamp 60 respectively.

[0069] Meanwhile, the ring-cutting rod 80 is installed outside the connecting rod 33, and the limiting ring 33a is rotated to press the cutting edge 81 into the welding end of the PE pipe. The ring-cutting rod 80 is rotated by a pry bar (rotation angle greater than 180 degrees) to cut the welding end of the PE pipe flat. Then the limiting ring 33a is unscrewed and the ring-cutting rod 80 is removed.

[0070] S30. Rotate the vertical mounting plate 21 to move the heating component 10 of the heating fixture between the welding ends of the two PE pipes.

[0071] S40. Connect the support fixture 30 and the heating fixture together, that is, connect the limit switch 38 to the corresponding solenoid directional valve 23.

[0072] S50. Press the two heating components 10 against the welding end of the corresponding PE pipe and heat them.

[0073] Specifically, the heating element 10 is first energized and preheated to the heating temperature. Then, through electromagnetic reversing, the telescopic cylinder 22 is pressurized to push the heating element 10 to the corresponding PE pipe opening, heating the end of the PE pipe. During the heating process, the temperature-sensing working fluid in the support liquid bladder 32 expands due to heat, continuously pushing the pressure-sensing piston 34 towards the limit switch 38 and causing the return spring 37 to store energy. When the temperature reaches the set threshold, the limit switch 38 triggers a reversing electrical signal to the electromagnetic reversing valve 23, controlling the electromagnetic reversing valve 23 to retract, causing the telescopic cylinder 22 to contract and drive the heating element 10 to retract.

[0074] S60. After the heating fixture controlled by the support fixture 30 drives the heating component 10 away from the end of the pipe, the heating component 10 is moved out between the welding ends of the two PE pipes, and the two support fixtures 30 are removed.

[0075] S70, drive the second pipe clamp 60 to move towards the first pipe clamp 50, and hold for a set time after the welding ends of the two PE pipes are squeezed to complete the connection of the two PE pipes.

[0076] In summary, the PE pipe hot-melt connection method provided in this embodiment, based on the PE pipe hot-melt connection device described in Embodiment 1, first installs the support fixture 30 at the end of the PE pipe to provide internal support for the end of the PE pipe, and then performs circumferential cutting through the circumferential cutting mechanism, which can ensure that the cut of the PE pipe welding end is flush. At the same time, during heating, the heating fixture and the support fixture 30 are linked. The support fixture 30 senses the heating temperature of the pipe end, and when the pipe end temperature reaches the preset value, the heating fixture is driven away from the pipe end, which can avoid the pipe temperature being too high or too low, thereby ensuring the connection quality of the pipe connection end.

[0077] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. 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 PE pipe hot-melt connection device, characterized in that, include: The heating fixture includes a heating component (10) and an installation mechanism (20). The heating component (10) is mounted on the installation mechanism (20). In the installed state, the installation mechanism (20) can press the heating component (10) against the end of the pipe and drive the heating component (10) away from the end of the pipe. The support fixture (30) can be detachably fixed inside the end of the pipe and sense the temperature inside the end of the pipe when in operation. The support fixture (30) is linked with the heating fixture. When the support fixture (30) senses that the temperature inside the pipe end has reached a preset value, it can control the installation mechanism (20) to drive the heating component (10) away from the pipe end.

2. The PE pipe hot-melt connection device according to claim 1, characterized in that, The heating element (10) is provided in two pieces, and the two heating elements (10) are symmetrically arranged on both sides of the mounting mechanism (20).

3. The PE pipe hot-melt connection device according to claim 2, characterized in that, The installation mechanism (20) includes: Vertical mounting plate (21); There are two telescopic cylinders (22), and the two telescopic cylinders (22) are longitudinally fixed to the side wall corresponding to the vertical mounting plate (21); The heating components (10) are respectively installed on the piston rods of the corresponding telescopic cylinders (22), and there are two support fixtures (30), which are respectively linked to the corresponding telescopic cylinders (22).

4. The PE pipe hot-melt connection device according to claim 3, characterized in that, The support fixture (30) includes: The support plate (31) has an installation ring groove on its side wall; The support liquid bladder (32) is made of thermally conductive material and is fitted inside the mounting ring groove. When a set pressure of temperature-sensitive working fluid is injected into the support liquid bladder (32), the support liquid bladder (32) expands and can fix the support plate (31) inside the end of the pipe. A connecting rod (33) is fixed in the middle of the support plate (31) and is provided with a piston chamber. A pressure-sensing piston (34) is provided in the piston chamber. The pressure-sensing piston (34) divides the piston chamber into a pressure-sensing chamber (35) and a back pressure chamber (36). The pressure-sensing chamber (35) is connected to the inner cavity of the support liquid bladder (32). A reset spring (37) is used to drive the pressure-sensitive piston (34) to reset; Limit switch (38) is installed in the back pressure chamber (36) and closes when the pressure-sensing piston (34) moves to the corresponding position; The telescopic cylinder (22) is equipped with an electromagnetic reversing valve (23), which is electrically connected to the limit switch (38).

5. The PE pipe hot-melt connection device according to claim 4, characterized in that, The limit switch (38) includes: The moving contact (38b) is mounted on the pressure-sensing piston (34); An adjusting screw (38c) is screwed onto the connecting rod (33) and extends along the length of the connecting rod (33); The stationary contact (38a) is installed at the end of the adjusting screw (38c) opposite the moving contact (38b).

6. The PE pipe hot-melt connection device according to claim 3, characterized in that, It also includes a mounting bracket (40), one side of the vertical mounting plate (21) being rotatably connected to the mounting bracket (40).

7. The PE pipe hot-melt connection device according to claim 6, characterized in that, Also includes: The first pipe clamp (50) is fixedly installed on the mounting bracket (40) and is used to clamp the end of a pipe. The second pipe clamp (60) is installed on the mounting bracket (40) and can slide along the length direction of the mounting bracket (40) to clamp the end of another pipe. The pulling cylinder (70) is fixedly connected at one end to the mounting bracket (40) and at the other end to the sliding seat of the second pipe clamp (60); The clamping center of the first pipe clamp (50) and the clamping center of the second pipe clamp (60) are arranged collinearly.

8. The PE pipe hot-melt connection device according to claim 4, characterized in that, It also includes a ring-cutting rod (80), the middle part of which is detachably mounted on the connection, and the ring-cutting rod (80) is rotatable about the axis of the connecting rod (33); Both ends of the ring cutting rod (80) along its length are provided with cutting edges (81), the cutting edges (81) are inclined, and the two cutting edges (81) are symmetrical about the center of the connecting rod (33).

9. The PE pipe hot-melt connection device according to claim 8, characterized in that, One end of the ring-cutting rod (80) is provided with an insertion tube (82), which is used to insert a pry bar.

10. A method for hot-melt connection of PE pipes, characterized in that, The PE pipe hot-melt connection device according to any one of claims 1 to 9 includes the following steps: S10. Insert the two support fixtures (30) into the welding end of the corresponding PE pipe respectively, and inject the temperature-sensing working fluid at a set pressure into the support liquid bladder (32) to fix the corresponding support fixtures (30). S20. Fix the two PE pipes that need to be connected into the corresponding first pipe clamp (50) and second pipe clamp (60) respectively; S30. Rotate the vertical mounting plate (21) to move the heating component (10) of the heating fixture between the welding ends of the two PE pipes; S40. Connect the support fixture (30) and the heating fixture together. S50. Press the two heating components (10) against the welding end of the corresponding PE pipe and heat them. S60. After the heating fixture controlled by the support fixture (30) drives the heating component (10) away from the end of the pipe, the heating component (10) is moved out between the welding ends of the two PE pipes, and the two support fixtures (30) are removed. S70, drive the second pipe clamp (60) to move towards the first pipe clamp (50), and hold for a set time after the welding ends of the two PE pipes are squeezed to complete the connection of the two PE pipes.

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