A kind of air-conditioning thermal insulation pipe knurling device

Abstract

The present application relates to a kind of air-conditioning thermal insulation pipe knurling device, including bottom plate, the upper side of bottom plate is sequentially provided with receiving frame one, receiving frame two and workbench, the top of receiving frame one is rotatably connected with pipe material winding roller by assembly part, the top of receiving frame two is rotatably connected with coating winding roller by assembly part, pipe material winding roller is winding pipe material, coating winding roller is winding strip-shaped thermal insulation coating, pipe material and strip-shaped thermal insulation coating are connected at the place of adhering assembly.Adaptability is strong, the degree of extrusion of knurling wheel and the degree of knurling wheel into knurling barrel can be flexibly adjusted by elastic rope, different thickness, different material strip-shaped thermal insulation coating and different pattern requirements knurling processing can be accurately adapted, the application range of the device is expanded.

Description

Technical Field

[0001] This invention belongs to the field of knurling for thermal insulation pipes, specifically a knurling device for air conditioning thermal insulation pipes. Background Technology

[0002] In the field of air conditioning insulation pipe processing, existing insulation pipe wrapping and knurling technologies have reached a certain level of maturity, enabling basic pipe insulation wrapping functions. Various winding and guiding mechanisms complete the initial bonding of insulation materials and pipes, meeting the basic insulation requirements of air conditioning systems. At the same time, some existing technologies can enhance the structural stability of insulation pipes or adapt to subsequent installation requirements through knurling structures, ensuring a certain level of efficiency in batch processing. They can adapt to the production scenarios of conventional specification insulation pipes, providing basic support for the large-scale production of air conditioning insulation pipes.

[0003] However, existing technologies still have many limitations: the amount of adhesive used in the insulation wrapping process is not properly controlled, often resulting in excessive spraying leading to material waste and increased costs, or uneven spraying leading to weak adhesion; the knurling mechanism has poor flexibility in adjusting the extrusion force and knurling depth, making it unable to adapt to different pattern requirements and knurling processing of insulation pipes of different specifications, and its versatility is weak. Therefore, a knurling device for air conditioning insulation pipes is proposed. Utility Model Content

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] Given the following technical problems in the existing technology: the amount of adhesive used in the insulation wrapping process is not reasonably controlled, often resulting in excessive spraying leading to material waste and increased costs, or uneven spraying leading to weak adhesion; the knurling mechanism has poor flexibility in adjusting the extrusion pressure and knurling depth, making it unable to adapt to different pattern requirements and knurling processing of insulation pipes of different specifications, and its versatility is weak.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a knurling device for air conditioning insulation pipes, comprising a base plate, a receiving frame one, a receiving frame two, and a worktable arranged sequentially on the upper side of the base plate; a pipe winding roller is rotatably connected to the top of the receiving frame one via an assembly, and a coating winding roller is rotatably connected to the top of the receiving frame two via an assembly; the pipe winding roller winds up the pipe, and the coating winding roller winds up the strip insulation coating; the pipe and the strip insulation coating are abutted together at the bonding component; a pressure cylinder is arranged on the worktable, and an extrusion channel is opened inside the pressure cylinder; the insulation pipe composed of the pipe and the strip insulation coating passes through the extrusion channel; the diameter of the extrusion channel is equal to the sum of the diameter of the pipe and the thickness of the strip insulation coating; a trumpet-shaped opening is opened at one end of the extrusion channel; a knurling mechanism is also arranged on the base plate, and the insulation pipe also passes through the knurling mechanism. By arranging the various receiving racks and workbenches in an orderly manner, the pipe and strip insulation coating are fed synchronously and guided precisely. The trumpet-shaped opening facilitates the smooth entry of the insulation pipe into the extrusion channel. The integrated knurling mechanism realizes the integrated processing of wrapping and knurling, improving processing efficiency.

[0007] As a preferred technical solution for a knurling device for air conditioning insulation pipes, the bonding component includes a gathering wheel and a guide wheel. A connecting bracket is located in the middle of the base plate, and the guide wheel and the gathering wheel are rotatably connected to the connecting bracket. The pipe passes under the guide wheel, and the outer ring of the gathering wheel has an annular groove. The strip of insulation coating passes through the annular groove of the gathering wheel. The annular groove, in conjunction with the guide wheel, ensures that the strip of insulation coating wraps around the lower surface of the pipe. The guide wheel can precisely limit and guide the pipe to prevent it from deviating, and the annular groove of the gathering wheel can shape and guide the strip of insulation coating. The two work together to achieve precise bonding between the strip of insulation coating and the lower surface of the pipe, laying the foundation for subsequent complete wrapping and improving the bonding accuracy in the initial stage of wrapping.

[0008] As a preferred technical solution for a knurling device for air conditioning insulation pipes, a receiving frame three is provided at the top of the base plate, and a gathering platform is provided on the receiving frame three. A connecting port is opened at the top of the gathering platform. The side of the connecting port is three-quarters of a circumference. The strip of insulation coating passing through the connecting port wraps around three-quarters of the pipe circumference. The connecting port of three-quarters of the circumference allows for progressive gathering and wrapping of the strip of insulation coating, ensuring that the strip of insulation coating fits smoothly against the circumference of the pipe, avoiding wrinkles or displacement during the wrapping process, and improving the uniformity and fit of the wrapping.

[0009] As a preferred technical solution for the knurling device of air conditioning insulation pipes, a sealing platform is also provided on the upper side of the workbench. A sealing groove is opened at the bottom of the sealing platform. The sealing groove squeezes the upper side of the pipe and the bonding component of the strip insulation coating, causing the two sides of the strip insulation coating to merge and seal the pipe and the remaining quarter of the top of the strip insulation coating. The sealing groove of the sealing platform can precisely align with the unwrapped part of the insulation pipe, achieving precise merging and sealing of the two sides of the strip insulation coating, ensuring the integrity and airtightness of the insulation pipe wrapping, and improving the insulation performance of the insulation pipe.

[0010] As a preferred technical solution for a knurling device for air conditioning insulation pipes, the knurling mechanism includes a knurling cylinder, knurling wheels, connecting frames, and connecting ports. Two connecting brackets (three) are located at the top of the base plate, and receiving frames (four) are mounted on the connecting brackets (three). Both ends of the knurling cylinder are rotatably connected to one of the receiving frames (four). Three sets of connecting components are sequentially opened on the knurling cylinder. Each connecting component includes two symmetrically distributed connecting ports that communicate with the internal channel of the knurling cylinder. A connecting frame is located on the outer side of the knurling cylinder, and a swing frame is rotatably connected to the top of the connecting frame. One end of the swing frame is rotatably connected to a knurling wheel. Each knurling wheel corresponds to one connecting port, extending through the corresponding connecting port into the internal channel. The knurling wheel presses against the outer side of the insulation pipe, and knurling patterns are formed on the circumference of the knurling wheel. The design of the three sets of connecting components and the knurling wheel enables simultaneous knurling at multiple locations on the insulation pipe, improving knurling efficiency and uniformity. The symmetrically distributed knurling wheels ensure balanced force on the insulation pipe, preventing deformation during the knurling process. The one-to-one correspondence between the knurling wheels and the connecting ports ensures precise knurling positioning.

[0011] As a preferred technical solution for knurling devices for air conditioning insulation pipes, a locking bolt is threaded into the middle of the connecting frame, and an elastic rope is wound around the locking bolt. One end of the elastic rope is connected to the middle of the swing frame. The threaded locking bolt allows for precise adjustment of the winding length of the elastic rope, thereby controlling the swing amplitude of the swing frame and flexibly adjusting the knurling wheel's pressing force. This adapts to the knurling requirements of insulation pipes of different specifications, improving the versatility of the device and the controllability of the knurling quality.

[0012] As a preferred technical solution for the knurling device of air conditioning insulation pipes, the top of the receiving frame three is equipped with a spray nozzle, with the nozzle pointing towards the upper side of the pipe. The precise pointing of the spray nozzle towards the upper side of the pipe allows for accurate application of adhesive at the sealing point of the strip insulation coating, ensuring strong adhesion while avoiding adhesive waste, thus improving the bonding effect and reducing production costs.

[0013] The beneficial effects of the knurling device for air conditioning insulation pipes of the present invention are as follows: 1. Strong adaptability: The squeezing force of the knurling wheel and the depth of the knurling wheel into the knurling cylinder can be flexibly adjusted by the elastic rope, which can accurately adapt to strip insulation coatings of different thicknesses and materials as well as knurling processing for different pattern requirements, thus expanding the applicability of the device; 2. Cost-saving and firm adhesion: Through the progressive sealing design of the gathering wheel, gathering platform, sealing platform and pressure cylinder, the strip insulation coating and the pipe are perfectly wrapped. At the same time, only a small amount of adhesive is precisely sprayed on the upper side of the pipe, which effectively reduces the amount of adhesive used, lowers production costs, and ensures a firm adhesion; 3. High wrapping and sealing quality: Through multiple... The phased wrapping and precise sealing process design ensures that the strip insulation coating fully and tightly wraps the pipe, avoiding problems such as incomplete sealing and loose fit, thus improving the insulation effect of the insulation pipe; 4. Strong processing stability: By fastening the assembly consisting of the arc frame and clamping support, different specifications of pipe winding rollers and coating winding rollers can be stably clamped. With the traction coordination of the drive motor and winding wheel, the continuity and stability of the processing process are guaranteed; 5. Convenient adjustment: By adjusting the winding length of the elastic rope on the locking bolt, the knurling depth and extrusion pressure of the knurling wheel can be easily controlled. The operation is simple and allows operators to quickly adjust according to processing needs, improving processing efficiency. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a side view of the receiving wheel of the present invention; Figure 3 This is a side view of the sealing platform of the present invention. Figure 4 For the present invention Figure 1 A partially enlarged structural diagram of part A in the middle; Figure 5 This is a side view of the receiving stage of the present invention.

[0015] Attached reference numerals: 1. Base plate; 2. Receiver frame one; 3. Receiver frame two; 4. Receiver frame four; 5. Pipe winding roller; 6. Coating winding roller; 7. Guide wheel; 8. Gathering wheel; 9. Pipe; 10. Strip insulation coating; 11. Gathering platform; 12. Receiver frame three; 13. Adhesive spray nozzle; 14. Sealing platform; 15. Pressure cylinder; 16. Knurling cylinder; 17. Connecting frame; 18. Connecting port; 19. Knurling wheel; 20. Elastic rope; 21. Locking bolt; 22. Fastening arc frame; 23. Clamping support; 24. Workbench. Detailed Implementation

[0016] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0017] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0018] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0019] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0020] like Figures 1-5As shown, this invention proposes a knurling device for air conditioning insulation pipes, including a base plate 1. A first receiving frame 2, a second receiving frame 3, and a worktable 24 are sequentially arranged on the upper side of the base plate 1. The top of the first receiving frame 2 is rotatably connected to a pipe winding roller 5 via an assembly. The top of the second receiving frame 3 is rotatably connected to a coating winding roller 6 via an assembly. The pipe winding roller 5 winds up a pipe 9, and the coating winding roller 6 winds up a strip of insulation coating 10. The pipe 9 and the strip of insulation coating 10 are abutted together at the bonding assembly. A pressure cylinder 15 is provided on the worktable 24. An extrusion channel is opened inside the pressure cylinder 15. The insulation pipe formed by the pipe 9 and the strip of insulation coating 10 passes through the extrusion channel. The diameter of the extrusion channel is equal to the sum of the diameter of the pipe 9 and the thickness of the strip of insulation coating 10. One end of the extrusion channel has a trumpet-shaped opening. A knurling mechanism is also provided on the base plate 1, and the insulation pipe also passes through the knurling mechanism. By arranging the various receiving racks and workbenches in an orderly manner, the pipe and strip insulation coating are fed synchronously and guided precisely. The trumpet-shaped opening facilitates the smooth entry of the insulation pipe into the extrusion channel. The integrated knurling mechanism realizes the integrated processing of wrapping and knurling, improving processing efficiency.

[0021] The bonding assembly includes a gathering wheel 8 and a guide wheel 7. A connecting bracket is located in the middle of the base plate 1, and the guide wheel 7 and the gathering wheel 8 are rotatably connected to the connecting bracket. The tube 9 passes under the guide wheel 7. The outer ring of the gathering wheel 8 has an annular groove. The strip-shaped insulation coating 10 passes through the annular groove of the gathering wheel 8. The annular groove, together with the guide wheel 7, allows the strip-shaped insulation coating 10 to wrap around the lower surface of the tube 9. The guide wheel can precisely limit and guide the tube to prevent it from deviating, and the annular groove of the gathering wheel can shape and guide the strip-shaped insulation coating. The two work together to achieve precise bonding between the strip-shaped insulation coating and the lower surface of the tube, laying the foundation for subsequent complete wrapping and improving the bonding accuracy in the initial stage of wrapping.

[0022] A receiving frame 3 12 is provided at the top of the base plate 1. A gathering platform 11 is provided on the receiving frame 3 12. A connecting port 18 is opened at the top of the gathering platform 11. The side of the connecting port 18 is three-quarters of a circumference. The strip of thermal insulation coating 10 wraps around three-quarters of the circumference of the pipe 9 through the connecting port 18. The connecting port of three-quarters of the circumference can gradually gather and wrap the strip of thermal insulation coating, so that the strip of thermal insulation coating fits smoothly against the circumference of the pipe, avoiding wrinkles or displacement during the wrapping process, and improving the uniformity and fit of the wrapping.

[0023] A sealing platform 14 is also provided on the upper side of the workbench 24. The bottom end of the sealing platform 14 has a sealing groove. The sealing groove squeezes the upper side of the pipe 9 and the bonding component of the strip insulation coating 10, so that the two sides of the strip insulation coating 10 are joined together and sealed, covering the pipe 9 and the remaining quarter of the top of the strip insulation coating 10. The sealing groove of the sealing platform can be precisely aligned with the unwrapped part of the insulation pipe, realizing the precise joining and sealing of the two sides of the strip insulation coating, ensuring the integrity and airtightness of the insulation pipe wrapping, and improving the insulation performance of the insulation pipe.

[0024] The knurling mechanism includes a knurling cylinder 16, a knurling wheel 19, a connecting frame 17, and a connecting port 18. Two connecting brackets 3 are provided at the top of the base plate 1, and a receiving frame 4 is provided on the connecting brackets 3. The two ends of the knurling cylinder 16 are rotatably connected to a receiving frame 4 respectively. Three sets of connecting parts are sequentially opened on the knurling cylinder 16. The connecting parts include two symmetrically distributed connecting ports 18. The connecting ports 18 are connected to the internal channel of the knurling cylinder 16. A connecting frame 17 is provided on the outside of the knurling cylinder 16. A swing frame is rotatably connected to the top of the connecting frame 17. A knurling wheel 19 is rotatably connected to one end of the swing frame. The knurling wheel 19 corresponds to the connecting port 18 one by one. The knurling wheel 19 passes through the corresponding connecting port 18 and extends into the internal channel. The knurling wheel 19 presses the outside of the insulation tube. The circumferential surface of the knurling wheel 19 is provided with knurling patterns. The design of three sets of connecting parts and knurling wheels enables simultaneous knurling at multiple locations on the insulation pipe, improving knurling efficiency and uniformity. The symmetrically distributed knurling wheels ensure balanced force on the insulation pipe and prevent deformation during the knurling process. The one-to-one correspondence between the knurling wheels and the connecting ports ensures precise knurling positions.

[0025] A locking bolt 21 is threadedly connected to the middle of the connecting frame 17. An elastic rope 20 is wound around the locking bolt 21, and one end of the elastic rope 20 is connected to the middle of the swing frame. The threaded locking bolt allows for precise adjustment of the winding length of the elastic rope, thereby controlling the swing amplitude of the swing frame and enabling flexible adjustment of the knurling wheel's pressing force. This adapts to the knurling requirements of different specifications of insulation pipes, improving the versatility of the device and the controllability of the knurling quality.

[0026] The top of the receiving frame 3 12 is equipped with a glue spray nozzle 13, with the nozzle pointing towards the upper side of the pipe 9. The glue spray nozzle is precisely aimed at the upper side of the pipe, which can accurately spray adhesive at the joint and sealing position of the strip insulation coating, ensuring strong adhesion, avoiding waste of adhesive, improving the bonding effect and reducing production costs.

[0027] The compression force of the knurling wheel 19 and the depth of the knurling wheel 19 into the knurling cylinder 16 through the connecting port 18 can be adjusted by the elastic rope 20 to accommodate strip insulation coatings 10 of different thicknesses and materials or knurling wheels 19 with different patterns. The strip insulation coating 10 is gradually sealed by the gathering wheel 8, gathering platform 11, sealing platform 14 and pressing cylinder 15, so that the strip insulation coating 10 perfectly wraps the pipe 9 to form an insulation pipe. A small amount of adhesive can be sprayed only on the upper side of the pipe 9, which can reduce the use of adhesive.

[0028] The locking bolt 21 engages with the connecting bracket 17 to clamp the elastic rope 20.

[0029] The two adjacent connecting ports 18 are deflected relative to each other by 60°.

[0030] The assembly includes a fastening arc frame 22 and a clamping bracket 23. The bottom end of the clamping bracket 23 is connected to a receiving frame 1 2 or a receiving frame 2 3. One end of the clamping bracket 23 is rotatably connected to one end of the fastening arc frame 22. The other end of the fastening arc frame 22 is connected to the other end of the clamping bracket 23 by bolts. The fastening arc frame 22 and the clamping bracket 23 clamp the pipe winding roller 5 or the coating winding roller 6.

[0031] The retractor 8 is fixedly connected to the power output end of the drive motor.

[0032] By adjusting the length of the elastic rope 20 wrapped around the locking bolt 21, the extent to which the knurling wheel 19 enters the connecting port 18 can be controlled, and the squeezing force of the knurling wheel 19 on the insulation pipe can be controlled.

[0033] The specific implementation method is as follows: The drive motor drives the take-up wheel 8 to rotate, and the tube 9 passes through the lower side of the guide wheel 7. The guide wheel 7 squeezes the tube 9 into the upper side of the take-up wheel 8, so that the strip-shaped thermal insulation coating 10 is pressed into the annular groove of the take-up wheel 8. The strip-shaped thermal insulation coating 10 curls through the annular groove of the take-up wheel 8, wrapping the lower surface of the tube 9 to initially form a thermal insulation tube. After passing the take-up wheel 8, the thermal insulation tube passes under the adhesive spray nozzle 13. The adhesive spray nozzle 13 is connected to the liquid supply pipe. The adhesive spray nozzle 13 sprays adhesive liquid. The amount of spraying is controlled so that there is no leakage when the tube 9 and the strip-shaped thermal insulation coating 10 are wrapped. Generally, two adhesive spray nozzles 13 are provided. The adhesive sprayed by the spray nozzle 13 is located on the two sides of the top of the insulation pipe to prevent the top of the insulation pipe from getting sticky. The insulation pipe passes through the gathering table 11, which squeezes the two sides of the strip insulation coating 10, causing the strip insulation coating 10 to curl and come closer together. Finally, it passes through the sealing table 14 to make the strip insulation coating 10 at the top of the insulation pipe join together, and then it is pressed by the pressure cylinder 15. After the whole process, the insulation pipe is wound by the winding wheel, which generates another traction force. The traction force ensures that the insulation pipe can pass through the inside of the knurling cylinder 16. The outside of the insulation pipe is squeezed by the knurling wheel 19 inside the knurling cylinder 16 to form knurling.

[0034] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0035] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A knurling device for air conditioning insulation pipes, characterized in that: The base plate (1) is provided with a first receiving frame (2), a second receiving frame (3) and a workbench (24) arranged sequentially on the upper side of the base plate (1). The top of the first receiving frame (2) is rotatably connected to a pipe winding roller (5) through an assembly. The top of the second receiving frame (3) is rotatably connected to a coating winding roller (6) through an assembly. The pipe winding roller (5) winds up the pipe (9) and the coating winding roller (6) winds up the strip insulation coating (10). The pipe (9) and the strip insulation coating (10) ) is attached to the bonding component; a pressure cylinder (15) is provided on the workbench (24), and an extrusion channel is provided inside the pressure cylinder (15). The insulation pipe composed of the pipe (9) and the strip insulation coating (10) passes through the extrusion channel. The diameter of the extrusion channel is equal to the sum of the diameter of the pipe (9) and the thickness of the strip insulation coating (10). A trumpet-shaped opening is provided at one end of the extrusion channel. A knurling mechanism is also provided on the base plate (1), and the insulation pipe also passes through the knurling mechanism.

2. The knurling device for an air conditioning insulation pipe according to claim 1, characterized in that... The bonding assembly includes a gathering wheel (8) and a guide wheel (7). A connecting bracket is provided in the middle of the base plate (1). The guide wheel (7) and the gathering wheel (8) are rotatably connected to the connecting bracket. The tube (9) passes under the guide wheel (7). An annular groove is provided on the outer ring of the gathering wheel (8). The strip-shaped thermal insulation coating (10) passes through the annular groove of the gathering wheel (8). The annular groove cooperates with the guide wheel (7) to make the strip-shaped thermal insulation coating (10) wrap around the lower surface of the tube (9).

3. The knurling device for an air conditioning insulation pipe according to claim 1, characterized in that: The top of the base plate (1) is provided with a support frame three (12), and a gathering platform (11) is provided on the support frame three (12). A connecting port (18) is opened at the top of the gathering platform (11). The side of the connecting port (18) is three-quarters of a circle. The strip-shaped heat insulation coating (10) passing through the connecting port (18) wraps three-quarters of the circumference of the pipe (9).

4. The knurling device for an air conditioning insulation pipe according to claim 3, characterized in that: A sealing platform (14) is also provided on the upper side of the workbench (24). A sealing groove is provided at the bottom of the sealing platform (14). The sealing groove squeezes the upper side of the pipe (9) and the bonding component of the strip insulation coating (10), so that the two sides of the strip insulation coating (10) are combined and the remaining quarter of the top of the pipe (9) and the strip insulation coating (10) are sealed.

5. The knurling device for an air conditioning insulation pipe according to claim 1, characterized in that: The knurling mechanism includes a knurling cylinder (16), a knurling wheel (19), a connecting frame (17), and a connecting port (18). Two connecting brackets are provided at the top of the base plate (1), and a receiving frame (4) is provided on the connecting brackets. The two ends of the knurling cylinder (16) are rotatably connected to a receiving frame (4). Three sets of connecting parts are sequentially opened on the knurling cylinder (16). The connecting parts include two symmetrically distributed connecting ports (18). The connecting ports (18) are connected to the internal channel of the knurling cylinder (16). A connecting frame (17) is provided on the outside of the knurling cylinder (16). A swing frame is rotatably connected to the top of the connecting frame (17). A knurling wheel (19) is rotatably connected to one end of the swing frame. The knurling wheel (19) corresponds one-to-one with the connecting port (18). The knurling wheel (19) passes through the corresponding connecting port (18) and extends into the internal channel. The knurling wheel (19) squeezes the outside of the insulation pipe. The circumferential surface of the knurling wheel (19) is provided with knurling patterns.

6. The knurling device for an air conditioning insulation pipe according to claim 5, characterized in that: The middle of the connecting frame (17) is threaded with a locking bolt (21), and an elastic rope (20) is wrapped around the locking bolt (21). One end of the elastic rope (20) is connected to the middle of the swing frame.

7. The knurling device for an air conditioning insulation pipe according to claim 3, characterized in that: The top of the support frame three (12) is equipped with a glue spray nozzle (13), and the nozzle of the glue spray nozzle (13) points to the upper side of the pipe (9).

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