Pipeline hot melt connection device and connection method

Abstract

The present invention relates to the technical field of pipe hot-melt welding, and proposes a pipe hot-melt connection device and connection method. The device comprises a machine platform, and a first clamping unit, a second clamping unit, and a hot-melt unit disposed on the machine platform. The first clamping unit and the second clamping unit are both capable of reciprocating in a linear plug-in direction. The hot-melt unit comprises a hot-melt clamp and a hot-melt disk. The hot-melt clamp drives the hot-melt disk to selectively enter or exit the linear plug-in direction. The hot-melt disk has heating portions on both sides. This technical solution solves the problem in the prior art of pipe hot-melt welding that factors such as welding temperature and plug-in depth are difficult to control, resulting in unsatisfactory welding results.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline hot-melt welding, and in particular to a pipeline hot-melt connection device and a connection method. Background Art

[0002] Conventional methods such as welding, sealant fixing, and mechanical connection are generally used for PPH pipe connections. Welding methods can be categorized into four types: butt fusion welding, plug fusion welding, standard hot air welding, and extrusion hot air welding. Butt fusion welding is suitable for acidic pipelines with larger diameters and lower density, and also applies relatively low pressure to the medium. Butt fusion welding machines are available in a wide range of styles, enabling both semi-automated and automated processes. Plug fusion welding is suitable for acidic pipelines with smaller diameters and higher pressures, primarily connecting straight pipe sections and fittings. Currently, plug fusion welding is primarily performed manually by the operator. Standard hot air welding has relatively low technical requirements and is widely used in production practice. Extrusion hot air welding requires specialized welding equipment and requires higher technical skills.

[0003] The application of hot-melt welding technology to plug welding also faces challenges. In actual construction, the insertion and rotation of the pipe may be subject to certain limitations, and the insertion depth and heating temperature of the pipe are difficult to control, resulting in suboptimal weld quality. Furthermore, the large number of plug welds and the complex pipe shape place new demands on the pipe clamp structure. Summary of the Invention

[0004] The present invention provides a pipe hot-melt connection device and connection method, which solves the problem in the prior art that factors such as welding temperature and insertion depth are difficult to control during pipe hot-melt welding, resulting in unsatisfactory welding effects.

[0005] The technical solutions of the present invention are as follows:

[0006] A pipe hot melt connection device, the hot melt connection device includes a machine and a first clamping unit, a second clamping unit and a hot melt unit arranged on the machine, wherein the first clamping unit and the second clamping unit can both move back and forth in a linear plug-in direction, the hot melt unit includes a hot melt clamp and a hot melt disk, the hot melt clamp drives the hot melt disk to selectively enter or move out of the linear plug-in direction, and both sides of the hot melt disk have heating parts.

[0007] The heating parts on both sides of the hot melt plate are respectively a large diameter heating end and a small diameter heating end, wherein the large diameter heating end includes a large diameter heating outer sleeve and a large diameter heating inner sleeve, and the temperature of the large diameter heating inner sleeve is higher than the temperature of the large diameter heating outer sleeve, and the small diameter heating end includes a small diameter heating outer sleeve and the small diameter heating inner sleeve, and the temperature of the small diameter heating outer sleeve is higher than the temperature of the small diameter heating inner sleeve.

[0008] The large-diameter heating inner sleeve is provided with at least three heating zones and the heating space of each heating zone is relatively independent. The small-diameter heating outer sleeve is provided with at least three heating zones and the heating space of each heating zone is relatively independent. The temperature of the middle heating zone of the large-diameter heating inner sleeve and the small-diameter heating inner sleeve is higher than that of the heating zones on both sides.

[0009] The hot melt clamp includes a clamping link, a telescopic cylinder, a first proximity switch, and a second proximity switch, wherein the middle part of the clamping link is hingedly arranged on the machine platform, the hot melt plate is arranged at one end of the clamping link, the telescopic end of the telescopic cylinder is hingedly connected to the end of the clamping link away from the hot melt plate, and the first proximity switch and the second proximity switch are respectively arranged on both sides of the hinge at the middle part of the clamping link.

[0010] The hot melt connection device further includes a linear guide rail, which is arranged on the machine platform. The first clamping unit and the second clamping unit can be movably arranged on the linear guide rail.

[0011] The hot melt connection device also includes two driving units, which respectively drive the first clamping unit and the second clamping unit to move toward or away from each other. The driving unit includes a servo motor and a lead screw. The lead screw is connected to the output end of the servo motor. The first clamping unit and the second clamping unit are both provided with a wire sleeve. The lead screw cooperates with the wire sleeve. The rotation of the lead screw drives the first clamping unit and the second clamping unit to move.

[0012] The first clamping unit and the second clamping unit both include a carrying plate, a fixed chuck, a clamping drive device and a clamping chuck, wherein the carrying plate is slidably arranged on the linear guide rail, the wire sleeve is arranged at the bottom of the carrying plate, the fixed chuck is arranged on the carrying plate, the clamping drive device is arranged on the carrying plate, and the clamping chuck is arranged on the output end of the clamping drive device, and the clamping chuck approaches or moves away from the fixed chuck to achieve clamping or loosening.

[0013] The clamping surface of the clamping chuck is inclined in the vertical direction, and the upper portion of the clamping surface of the clamping chuck is closer to the workpiece to be clamped than the lower portion.

[0014] The present invention also discloses a pipe hot-melt connection method, which is based on the pipe hot-melt connection device described in any one of the above solutions and includes the following steps:

[0015] Pipe clamping: Place large diameter pipes and small diameter pipes on the first clamping unit and the second clamping unit respectively, and reserve heating length at the connection ends according to design requirements;

[0016] Hot melt heating, the hot melt plate moves to the heating position, the first clamping unit and the second clamping unit respectively transport the large diameter pipe and the small diameter pipe to the heating position to heat the connecting end to the target temperature;

[0017] In preparation for splicing, the first clamping unit and the second clamping unit respectively transport the large-diameter pipe and the small-diameter pipe to outside the heating position, and the hot melt clamp moves the hot melt plate to outside the heating position;

[0018] Hot melt splicing: the first clamping unit and the second clamping unit transport the large-diameter pipe and the small-diameter pipe along a straight line for splicing respectively. The splicing is completed according to the designed splicing depth. After cooling to the required temperature, the hot melt connection is completed.

[0019] Based on the above solution, the step of "hot melt heating, moving the hot melt plate to the heating position, and the first clamping unit and the second clamping unit respectively transporting the large diameter pipe and the small diameter pipe to the heating position to heat the connection end to the target temperature" is further specified as follows:

[0020] Hot melt heating, the hot melt plate moves to the heating position, the first clamping unit and the second clamping unit respectively transport the large diameter pipe and the small diameter pipe to the heating position, the heating part of the hot melt plate heats the inner diameter part of the large diameter pipe to the target temperature, and the outer diameter part of the large diameter pipe is lower than the target temperature. The outer diameter part of the small diameter pipe is heated to the target temperature, and the inner diameter part of the small diameter pipe is lower than the target temperature.

[0021] The working principle and beneficial effects of the present invention are:

[0022] The present invention discloses a pipe hot-melt connection device, wherein a first clamping unit and a second clamping unit are installed on a machine platform, and the two clamping units can move toward or away from each other in a straight line direction to achieve approach or distance, and reciprocating movement. A hot-melt unit is also provided on the machine platform, and the hot-melt unit is specifically a hot-melt clamper provided on the machine platform to drive the hot-melt disk. The hot-melt clamp can drive the hot-melt disk to move in the straight line direction between the first clamping unit and the second clamping unit. A heating part is provided on both sides of the hot-melt disk, so the first clamping unit and the second clamping unit can simultaneously clamp the pipe fitting and move it to the hot-melt disk for heating. Then the hot-melt disk withdraws, and the first clamping unit and the second clamping unit move to plug the pipe fitting for hot-melt welding. Through the above scheme, the heating temperature control of the two pipe fittings is more synchronous and accurate, the plugging after heating can be more timely, the linear plugging improves the accuracy and depth of the plugging, and improves the stability and quality of the hot-melt connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Figure 1 Schematic diagram of the structure of the pipeline connection device of the present invention Figure 1 ;

[0025] Figure 2 Schematic diagram of the structure of the pipeline connection device of the present invention Figure 2 ;

[0026] Figure 3 Schematic diagram of the structure of the pipeline connection device of the present invention Figure 3 ;

[0027] Figure 4 Schematic diagram of the cross-sectional structure of the hot melt tray of the present invention, showing an embodiment of three heating zones;

[0028] In the figure: 1. Machine, 2. First clamping unit, 3. Second clamping unit, 4. Hot melt clamp, 5. Hot melt disk, 6. Large diameter heating end, 7. Small diameter heating end, 8. Large diameter heating outer sleeve, 9. Large diameter heating inner sleeve, 10. Small diameter heating outer sleeve, 11. Small diameter heating inner sleeve, 12. Clamping link, 13. Telescopic cylinder, 14. First proximity switch, 15. Second proximity switch, 16. Linear guide, 17. Servo motor, 18. Lead screw, 19. Thread sleeve, 20. Carrying plate, 21. Fixed chuck, 22. Clamping drive device, 23. Clamping chuck. DETAILED DESCRIPTION

[0029] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0030] like Figures 1 to 4 As shown, this embodiment proposes a pipe hot melt connection device, which includes a machine 1 and a first clamping unit 2, a second clamping unit 3 and a hot melt unit arranged on the machine 1, wherein the first clamping unit 2 and the second clamping unit 3 can both move back and forth in a linear plug-in direction, and the hot melt unit includes a hot melt clamp 4 and a hot melt disk 5, and the hot melt clamp 4 drives the hot melt disk 5 to selectively enter or move out of the linear plug-in direction, and both sides of the hot melt disk 5 have heating parts.

[0031] In this embodiment, a pipe hot melt connection device is disclosed. By installing a first clamping unit 2 and a second clamping unit 3 on a machine platform 1, the two clamping units can move toward or away from each other in a straight line direction to achieve approach or distance, and reciprocating movement. A hot melt unit is also provided on the machine platform 1. The hot melt unit is specifically a hot melt clamper 4 provided on the machine platform 1 to drive the hot melt disk 5. The hot melt clamper 4 can drive the hot melt disk 5 to move in the straight line direction between the first clamping unit 2 and the second clamping unit 3. A heating part is provided on both sides of the hot melt disk 5. Then the first clamping unit 2 and the second clamping unit 3 can simultaneously clamp the pipe fittings and move them to the hot melt disk 5 for heating. Then the hot melt disk 5 withdraws, and the first clamping unit 2 and the second clamping unit 3 move to plug the pipe fittings for hot melt welding. Through the above scheme, the heating temperature control of the two pipe fittings is more synchronized and accurate, the plugging after heating can be more timely, the linear plugging improves the accuracy and depth of the plugging, and improves the stability and quality of the hot melt connection.

[0032] The heating parts on both sides of the hot melt plate 5 are respectively a large diameter heating end 6 and a small diameter heating end 7, wherein the large diameter heating end 6 includes a large diameter heating outer sleeve 8 and a large diameter heating inner sleeve 9, and the temperature of the large diameter heating inner sleeve 9 is higher than the temperature of the large diameter heating outer sleeve 8, and the small diameter heating end 7 includes a small diameter heating outer sleeve 10 and the small diameter heating inner sleeve 11, and the temperature of the small diameter heating outer sleeve 10 is higher than the temperature of the small diameter heating inner sleeve 11.

[0033] On the basis of the above embodiment, the heating parts on both sides of the hot melt disk 5 are different, one side is a large-diameter heating end 6, and the other side is a small-diameter heating end 7. The diameter of the pipe heated by the large-diameter heating end 6 is larger than the diameter of the pipe heated by the small-diameter heating end 7. After the small-diameter pipe is heated, it is inserted into the large-diameter pipe. The outer diameter surface of the small-diameter pipe is hot-melted to the inner diameter surface of the large-diameter pipe to form a seal. The large-diameter heating end 6 includes a large-diameter heating outer sleeve 8 and a large-diameter heating inner sleeve 9. The temperature of the large-diameter heating inner sleeve 9 is higher than that of the large-diameter heating outer sleeve 8. When the large-diameter pipe is heated, the inner diameter surface of the large-diameter pipe can be in a better melted state during hot-melt connection, and the outer diameter surface of the large-diameter pipe is at a relatively high temperature but can maintain a stable shape of the pipe. In addition, the small-diameter heating end 7 includes a small-diameter heating outer sleeve 10 And the small-diameter heating inner sleeve 11, the temperature of the small-diameter heating outer sleeve 10 is higher than the temperature of the small-diameter heating inner sleeve 11. When the small-diameter pipe fitting is heated, the outer diameter surface of the small-diameter pipe fitting can be in a better melted state during hot-melt connection, and the inner diameter surface of the small-diameter pipe fitting is at a relatively high temperature but can maintain a stable shape of the pipe fitting. Then, after the heating is completed, the small-diameter pipe fitting needs to be inserted into the large-diameter pipe fitting for hot-melt connection, ensuring that the control of the insertion depth and the accuracy of the insertion depth affect the stability of the hot-melt connection. The outer diameter surface of the large-diameter pipe fitting and the inner diameter surface of the small-diameter pipe fitting can maintain a certain shape stability, and the pipe fitting can have a certain rigidity when inserted, thereby ensuring the insertion depth and accuracy, and the inner diameter surface of the large-diameter pipe fitting and the outer diameter surface of the small-diameter pipe fitting can be in a hot-melt state for effective hot-melt connection.

[0034] For example, the large-diameter heating outer sleeve 8 is heated to 290±10°C, the large-diameter heating inner sleeve 9 is heated to 320±10°C, the small-diameter heating inner sleeve 11 is heated to 290±10°C, and the small-diameter heating outer sleeve 10 is heated to 320±10°C. The large-diameter pipe fittings and the small-diameter pipe fittings are heated to achieve accurate temperature control and prepare for subsequent hot melt connection. It should be noted that the above-mentioned temperature control is only one implementation method, which is not restrictive.

[0035] The large-diameter heating inner sleeve 9 is provided with at least three heating zones and the heating space of each heating zone is relatively independent. The small-diameter heating outer sleeve 10 is provided with at least three heating zones and the heating space of each heating zone is relatively independent. The middle heating zone of the large-diameter heating inner sleeve 9 and the small-diameter heating inner sleeve 11 is higher in temperature than the heating zones on both sides.

[0036] Based on the above embodiment, the large-diameter heating inner sleeve 9 can be provided with at least three relatively independent heating zones. Similarly, the small-diameter heating outer sleeve 10 can be provided with at least three relatively independent heating zones. The temperature of the central heating zone of both the large-diameter heating inner sleeve 9 and the small-diameter heating outer sleeve 10 is higher than the temperature of the heating zones on both sides. For example, in a possible embodiment, the large-diameter heating inner sleeve 9 and the small-diameter heating outer sleeve 10 employ three heating zones. Two annular partitions can be optionally provided on the large-diameter heating inner sleeve 9 to separate the three zones. Similarly, two annular partitions can be provided on the small-diameter heating outer sleeve 10 to separate the three heating zones. For example, the temperature of the central heating zone can be set to 320±2°C, and the temperature of the heating zones on both sides can be set to 315±2°C. Of course, this is only an example and is not restrictive. The heating zones of the large-diameter heating inner sleeve 9 and the small-diameter heating outer sleeve 10 can more accurately control the temperature at which the pipe is heated to the hot melt state. In combination with the accuracy of the insertion depth, the optimal hot melt position of the large-diameter pipe corresponds to the optimal hot melt position of the small-diameter pipe, which can further improve the hot melt connection effect of the pipes.

[0037] The hot melt clamper 4 includes a clamping link 12, a telescopic cylinder 13, a first proximity switch 14, and a second proximity switch 15, wherein the middle part of the clamping link 12 is hingedly set on the machine 1, the hot melt disk 5 is set at one end of the clamping link 12, the telescopic end of the telescopic cylinder 13 is hinged to the end of the clamping link 12 away from the hot melt disk 5, and the first proximity switch 14 and the second proximity switch 15 are respectively set on both sides of the middle hinge of the clamping link 12.

[0038] On the basis of the above embodiment, the hot melt clamper 4 needs to drive the hot melt disk 5 to move so as to enter or exit between the moving routes of the first clamping unit 2 and the second clamping unit 3. Specifically, by arranging a telescopic cylinder 13 on the machine 1, a suitable position is selected between the two sections of the clamping link 12 and hinged to the base, the telescopic end of the telescopic cylinder 13 is hinged to one end of the clamping link 12, and the hot melt disk 5 is arranged at the other end of the clamping link 12. The telescopic cylinder 13 drives the clamping link 12 to swing around the hinge point to realize the position change of the hot melt disk 5. In order to further accurately control the position of the hot melt disk 5, a first proximity switch 14 and a second proximity switch 15 are arranged on both sides of the hinge position of the clamping link 12. When the hot melt disk 5 enters between the moving routes of the first clamping unit 2 and the second clamping unit 3, the clamping link 12 approaches the first proximity switch 14. Conversely, when the hot melt disk 5 exits, the clamping link 12 approaches the second proximity switch 15, thereby realizing precise control of the position.

[0039] The hot melt connection device further includes a linear guide rail 16 , which is disposed on the machine platform 1 . Both the first clamping unit 2 and the second clamping unit 3 are movably disposed on the linear guide rail 16 .

[0040] On the basis of the above embodiment, by providing a linear guide rail 16, the first clamping unit 2 and the second clamping unit 3 can maintain linear movement, so that the clamped pipe can be accurately aligned.

[0041] The hot melt connection device also includes two driving units, which respectively drive the first clamping unit 2 and the second clamping unit 3 to move toward or away from each other. The driving unit includes a servo motor 17 and a lead screw 18. The lead screw 18 is connected to the output end of the servo motor 17. The first clamping unit 2 and the second clamping unit 3 are both provided with a wire sleeve 19. The lead screw 18 cooperates with the wire sleeve 19. The rotation of the lead screw 18 drives the first clamping unit 2 and the second clamping unit 3 to move.

[0042] On the basis of the above embodiment, a driving unit is provided to drive the first clamping unit 2 and the second clamping unit 3 to move. Specifically, two sets of driving units are provided on the machine 1. Each set of driving units is a servo motor 17 that drives the lead screw 18 to rotate. The lead screw 18 cooperates with the wire sleeve 19. When the lead screw 18 rotates, the wire sleeve 19 located on the first clamping unit 2 and the second clamping unit 3 will be driven, thereby moving along the linear guide rail 16.

[0043] The first clamping unit 2 and the second clamping unit 3 both include a carrying plate 20, a fixed chuck 21, a clamping drive device 22 and a clamping chuck 23, wherein the carrying plate 20 is slidably set on the linear guide rail 16, the wire sleeve 19 is set at the bottom of the carrying plate 20, the fixed chuck 21 is set on the carrying plate 20, the clamping drive device 22 is set on the carrying plate 20, and the clamping chuck 23 is set on the output end of the clamping drive device 22, and the clamping chuck 23 approaches or moves away from the fixed chuck 21 to achieve clamping or loosening.

[0044] Based on the above embodiments, the clamping structures of the first clamping unit 2 and the second clamping unit 3 are substantially similar and can clamp pipes of different diameters. Both are mainly composed of a supporting plate 20, which moves on a linear guide rail 16. The wire sleeve 19 is arranged at the bottom of the supporting plate 20. A fixed chuck 21 and a clamping chuck 23 are installed on the supporting plate 20. The clamping chuck 23 can be driven by a clamping drive device 22 to achieve clamping or loosening close to or away from the fixed chuck 21.

[0045] The clamping surface of the clamping chuck 23 is inclined in the vertical direction, and the upper portion of the clamping surface of the clamping chuck 23 is closer to the workpiece to be clamped than the lower portion.

[0046] Based on the above embodiment, the clamping surface of the clamping chuck 23 is set as an inclined surface. In the vertical direction, the upper part of the clamping surface is closer to the part to be clamped, ie the pipe, than the lower part, so as to maintain clamping stability.

[0047] The present application also proposes a pipe hot melt connection method, which is based on the pipe hot melt connection device described in any one of the above embodiments, and includes the following steps:

[0048] For pipe clamping, place the large-diameter pipe and the small-diameter pipe on the first clamping unit 2 and the second clamping unit 3 respectively, and reserve heating length at the connection ends according to design requirements;

[0049] Hot melt heating, the hot melt plate 5 moves to the heating position, the first clamping unit 2 and the second clamping unit 3 respectively transport the large diameter pipe and the small diameter pipe to the heating position to heat the connecting end to the target temperature;

[0050] In preparation for splicing, the first clamping unit 2 and the second clamping unit 3 respectively transport the large-diameter pipe and the small-diameter pipe to outside the heating position, and the hot melt clamp 4 moves the hot melt plate 5 to outside the heating position;

[0051] Hot melt splicing: the first clamping unit 2 and the second clamping unit 3 transport the large-diameter pipe and the small-diameter pipe along a straight line for splicing respectively. The splicing is completed according to the designed splicing depth. After cooling to the required temperature, the hot melt connection is completed.

[0052] After the hot melt is completed, the hot melt connection is completed.

[0053] The step of "hot melt heating, the hot melt plate 5 moves to the heating position, the first clamping unit 2 and the second clamping unit 3 respectively transport the large diameter pipe fitting and the small diameter pipe fitting to the heating position to heat the connection end to the target temperature" is further specified as follows:

[0054] Hot melt heating, the hot melt plate 5 moves to the heating position, the first clamping unit 2 and the second clamping unit 3 transport the large diameter pipe and the small diameter pipe to the heating position respectively, the heating part of the hot melt plate 5 heats the inner diameter part surface of the large diameter pipe to the target temperature, and the outer diameter part surface temperature of the large diameter pipe is lower than the target temperature, and heats the outer diameter part surface of the small diameter pipe to the target temperature, and the inner diameter part surface temperature of the small diameter pipe is lower than the target temperature.

[0055] On the basis of the above embodiment, the inner and outer diameters and hot melt partitions are optimized based on the heating parts at both ends of the hot melt disk 5 of the pipeline hot melt connection device, that is, the heating part of the hot melt disk 5 is an inner sleeve and an outer sleeve structure, and the hot melt heating partition is set. Based on the above structure, in the hot melt heating step, the outer diameter surface of the large diameter pipe is heated to a lower temperature than the inner diameter surface, and the temperature of the inner diameter surface is heated to different hot melt temperatures. The hot melt temperature of the middle partition of multiple partitions is higher than the hot melt temperature of the partitions on both sides. The outer diameter surface of the small diameter pipe is heated to a higher temperature than the inner diameter surface. At the same time, the temperature of the outer diameter surface is heated to different hot melt temperatures. Similarly, the hot melt temperature of the middle partition of multiple partitions is higher than the hot melt temperature of the partitions on both sides. When the large diameter pipe and the small diameter pipe are plugged in for hot melt connection, the inner diameter surface of the large diameter pipe and the outer diameter surface of the small diameter pipe are correspondingly hot melted. The outer diameter surface of the large diameter pipe and the inner diameter surface of the small diameter pipe maintain a certain strength, ensuring that the plug-in depth is accurate and in place, thereby improving the quality of the hot melt connection.

[0056] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A pipe hot melt connection device, characterized in that: The hot melt connection device comprises a machine (1) and a first clamping unit (2), a second clamping unit (3) and a hot melt unit arranged on the machine (1), wherein the first clamping unit (2) and the second clamping unit (3) can both move back and forth in a linear plug-in direction, and the hot melt unit comprises a hot melt clamp (4) and a hot melt disk (5), wherein the hot melt clamp (4) drives the hot melt disk (5) to selectively enter or move out of the linear plug-in direction, and both sides of the hot melt disk (5) have heating parts; The heating parts on both sides of the hot melt disk (5) are respectively a large-diameter heating end (6) and a small-diameter heating end (7), wherein the large-diameter heating end (6) includes a large-diameter heating outer sleeve (8) and a large-diameter heating inner sleeve (9), and the temperature of the large-diameter heating inner sleeve (9) is higher than the temperature of the large-diameter heating outer sleeve (8); the small-diameter heating end (7) includes a small-diameter heating outer sleeve (10) and a small-diameter heating inner sleeve (11), and the temperature of the small-diameter heating outer sleeve (10) is higher than the temperature of the small-diameter heating inner sleeve (11).

2. The pipe hot melt connection device according to claim 1, characterized in that: The large-diameter heating inner sleeve (9) is provided with at least three heating zones, and the heating space of each heating zone is relatively independent. The small-diameter heating outer sleeve (10) is provided with at least three heating zones, and the heating space of each heating zone is relatively independent. The temperature of the middle heating zone of the large-diameter heating inner sleeve (9) and the small-diameter heating inner sleeve (11) is higher than that of the heating zones on both sides.

3. The pipe hot melt connection device according to claim 1, characterized in that: The hot melt clamp (4) comprises a clamping link (12), a telescopic cylinder (13), a first proximity switch (14), and a second proximity switch (15), wherein the middle portion of the clamping link (12) is hingedly arranged on the machine (1), the hot melt plate (5) is arranged at one end of the clamping link (12), the telescopic end of the telescopic cylinder (13) is hingedly connected to the end of the clamping link (12) away from the hot melt plate (5), and the first proximity switch (14) and the second proximity switch (15) are respectively arranged on both sides of the hinge at the middle portion of the clamping link (12).

4. The pipe hot melt connection device according to claim 1, characterized in that: The hot melt connection device further comprises a linear guide rail (16), wherein the linear guide rail (16) is arranged on the machine platform (1), and the first clamping unit (2) and the second clamping unit (3) can both be movably arranged on the linear guide rail (16).

5. The pipe hot melt connection device according to claim 4, characterized in that: The hot melt connection device also includes two driving units, and the two driving units respectively drive the first clamping unit (2) and the second clamping unit (3) to move toward or away from each other. The driving unit includes a servo motor (17) and a lead screw (18). The lead screw (18) is connected to the output end of the servo motor (17). The first clamping unit (2) and the second clamping unit (3) are both provided with a wire sleeve (19). The lead screw (18) cooperates with the wire sleeve (19). The lead screw (18) rotates to drive the first clamping unit (2) and the second clamping unit (3) to move.

6. The pipe hot melt connection device according to claim 5, characterized in that: The first clamping unit (2) and the second clamping unit (3) both include a carrier plate (20), a fixed chuck (21), a clamping drive device (22) and a clamping chuck (23), wherein the carrier plate (20) is slidably arranged on the linear guide rail (16), the wire sleeve (19) is arranged at the bottom of the carrier plate (20), the fixed chuck (21) is arranged on the carrier plate (20), the clamping drive device (22) is arranged on the carrier plate (20), the clamping chuck (23) is arranged on the output end of the clamping drive device (22), and the clamping chuck (23) approaches or moves away from the fixed chuck (21) to achieve clamping or loosening.

7. The pipe hot melt connection device according to claim 6, characterized in that: The clamping surface of the clamping chuck (23) is inclined in the vertical direction, and the upper portion of the clamping surface of the clamping chuck (23) is closer to the part to be clamped than the lower portion.

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