Heating and ventilation pipe welding auxiliary device for heating and ventilation construction

Abstract

The invention discloses a heating and ventilation pipe welding auxiliary device for heating and ventilation construction. The linear guide rail is mounted at the top of the bearing body; the two movable sliding blocks are assembled on the linear guide rail in a sliding manner; the parallel pneumatic claw air cylinders are fixed to the tops of the movable sliding blocks, the tooth-shaped hollow rotating cylinder is installed in the middle of the bearing body, a welding head installation hole and a positioning column installation hole are formed in the cylinder wall of the tooth-shaped hollow rotating cylinder, and the output ends of the welding head installation hole and the positioning column installation hole are both aligned with the axis of the tooth-shaped hollow rotating cylinder and used for installing a welding head and a positioning column correspondingly; and the tooth-shaped hollow rotating cylinder moves up and down and is adjusted through the lifting guide assembly, and the butt joint benchmark of the heating and ventilation pipe is found. According to the butt joint device, accurate positioning of a welding point and a butt joint reference can be achieved, stable clamping and synchronous butt joint of two sections of heating and ventilation pipes are achieved, manual holding and rope binding are replaced, pipeline displacement during welding is avoided, the butt joint coaxiality is improved, and the defects of weld joint deviation and the like are reduced.

Description

Technical Field

[0001] This invention relates to the technical field of welding auxiliary devices, and more particularly to a welding auxiliary device for HVAC pipes in HVAC construction. Background Technology

[0002] In HVAC engineering construction, the welding quality of copper and carbon steel pipes with specifications of DN20-DN100mm directly determines the sealing performance and operational stability of the HVAC system. The successful completion of this process highly depends on three core conditions: stable pipe clamping, precise connection, and flat end faces. Without specialized auxiliary equipment, welding operations will face many technical challenges: pipe clamping relies on manual holding or rope binding, which not only cannot maintain stability for a long time, but the high temperature of welding can also easily cause pipe displacement, resulting in defects such as weld misalignment and undercut, and in severe cases, leakage; the coaxial alignment of the two pipe sections relies entirely on the operator's visual judgment, which has a large margin of error and often results in pipe misalignment and axis misalignment, requiring repeated grinding of the weld seam afterward, significantly increasing construction costs; the pipe connection end faces need to be ground separately with a handheld grinder, and manual operation can easily lead to tilting and unevenness of the end faces, making it impossible to fit the welding trajectory, further increasing the difficulty of welding.

[0003] The lack of suitable auxiliary devices not only affects welding quality but also causes serious operational inconvenience. At the same time, some existing auxiliary tools are difficult to meet the needs of the field due to design flaws: when manually holding the pipe for grinding, the operator's labor intensity is high and there is a risk of high temperature burns; the positioning, grinding and welding processes are disconnected, the tools are frequently replaced, and the construction efficiency is low; some auxiliary devices are also bulky and complicated to assemble, making them difficult to move in the narrow space of the construction site, and the operation steps are cumbersome, requiring professional personnel to debug, which increases the construction burden. Summary of the Invention

[0004] Based on the shortcomings of the existing technology, the technical problem to be solved by the present invention is to provide a welding auxiliary device for HVAC pipes in HVAC construction, which can achieve precise positioning of the welding point and the docking reference, realize stable clamping and synchronous docking of two HVAC pipes, replace manual holding and rope binding, avoid pipe displacement during welding, improve docking coaxiality, and reduce defects such as weld seam offset.

[0005] To achieve the above objectives, the present invention employs the following technical measures: The HVAC pipe welding auxiliary device for HVAC construction of the present invention includes: a supporting body; a linear guide rail installed on the top of the supporting body; two movable sliders slidably mounted on the linear guide rail; a trapezoidal threaded rod with positive and negative threads threaded to the two movable sliders and passing through the side of the supporting body, wherein the positive and negative threaded sections of the trapezoidal threaded rod are respectively threaded to the two movable sliders to drive the two movable sliders to move synchronously in opposite directions; a parallel air gripper cylinder fixed to the top of each movable slider, wherein a pipe clamp is installed on the top of the parallel air gripper cylinder, the pipe clamp being used to clamp the HVAC pipe and to achieve preliminary connection of two HVAC pipe sections by moving the movable sliders; and a toothed hollow rotating cylinder installed in the middle of the supporting body. The cylinder wall has welding head mounting holes and positioning post mounting holes. The output ends of the welding head mounting holes and positioning post mounting holes are aligned with the axis of the toothed hollow rotating cylinder, and are used to install the welding head and positioning post respectively, so as to locate the welding point and the pipe docking reference. The functional component detachably connected to the toothed hollow rotating cylinder is a grinding wheel cover with grinding wheels fixedly installed on both sides. The grinding wheel cover rotates with the toothed hollow rotating cylinder to achieve horizontal grinding of the pipe end face. The power mechanism includes a circular gear meshing with the outer gear ring of the toothed hollow rotating cylinder, and a first driving component connected to the circular gear, which is used to drive the toothed hollow rotating cylinder to rotate. The toothed hollow rotating cylinder can be adjusted up and down by a lifting guide component to accurately locate the HVAC pipe docking reference.

[0006] Furthermore, the positive and negative tooth trapezoidal lead screw is rotatably supported on the lead screw support of the load-bearing body by a deep groove ball bearing, and the power end of the positive and negative tooth trapezoidal lead screw is connected to a second driving member.

[0007] As mentioned above, the deep groove ball bearing reduces the friction of the lead screw rotation and improves the stability of operation; the second drive component provides power to the lead screw, making the pipe docking drive more flexible and improving docking efficiency and controllability.

[0008] Furthermore, the first driving component and the second driving component are stepper motors or manual cranks, and the stepper motors are equipped with speed adjustment modules.

[0009] As shown above, dual drive types are available to suit different construction scenarios; the stepper motor has speed adjustment, which can accurately match the speed requirements of welding and grinding processes, and has strong operational adaptability.

[0010] Furthermore, the positioning post mounting hole and the welding head mounting hole are holes on the same outer circle line.

[0011] Furthermore, the clamping width of the pipe clamp is at least ten centimeters, and the inner surface of the pipe clamp is covered with a nitrile rubber anti-slip pad.

[0012] As shown above, the clamping width of more than 10 centimeters ensures the stability of the clamping and the load-bearing strength after being subjected to force; the nitrile rubber pad enhances the clamping friction to prevent loosening, while avoiding scratching the pipe surface, ensuring the clamping effect and the integrity of the pipe.

[0013] Furthermore, the mounting base of the toothed hollow rotating cylinder is provided with a lifting guide assembly, including a guide groove and a guide seat. The guide seat is threadedly connected to a lifting adjustment screw whose end abuts against the bottom of the guide groove. The lifting guide assembly can be adjusted up and down without offset in other directions.

[0014] As shown above, the lifting guide assembly has a simple structure and is easy to operate. The lifting adjustment screw precisely controls the height. The guide groove and guide seat work together to prevent deviation, ensuring accurate adjustment of the rotating cylinder height and adapting to different pipe diameter docking standards.

[0015] Furthermore, the grinding wheel is a diamond grinding wheel, and its rotation trajectory is parallel to the pipe's mating end face.

[0016] As mentioned above, diamond grinding wheels have high hardness and wear resistance; their rotation trajectory is parallel to the end face, ensuring a smooth grinding end face, reducing welding defects, and laying the foundation for high-quality welding.

[0017] Furthermore, the surface of the positioning post is engraved with scale lines.

[0018] The scale lines above visually indicate the alignment depth, aiding in the rapid calibration of the welding point and the pipe connection reference without the need for additional measuring tools, thus improving positioning accuracy and efficiency.

[0019] Furthermore, the supporting body is equipped with a handle, which provides a force point for manual handling and is suitable for the movement needs of the construction site; the structure is simple and does not increase the burden on the device, making it easy to move the equipment in narrow spaces.

[0020] Furthermore, the detachable connection between the functional component and the toothed hollow rotating cylinder is a threaded connection, with the thread direction being the same as that of the toothed hollow rotating cylinder. The threaded connection is convenient for disassembly and assembly, facilitating the replacement of the functional component; the same direction of rotation prevents the connection from loosening during the operation of the rotating cylinder, ensuring the stability of the component during grinding and welding.

[0021] Furthermore, a protective shell is installed on the periphery of the spur gear. The protective shell can prevent foreign objects from being caught in the gear meshing area, avoid personnel accidentally touching the rotating parts, ensure the safe operation of the equipment, and extend the service life of the gear.

[0022] Therefore, the beneficial effects of the HVAC pipe welding auxiliary device of the present invention are as follows: 1. By cooperating with linear guide rails, positive and negative toothed trapezoidal lead screws and moving sliders, combined with parallel air gripper cylinders and pipe clamps, two sections of HVAC pipes can be stably clamped and synchronously connected, replacing manual holding and rope binding, avoiding pipe displacement during welding, improving the coaxiality of the connection, and reducing defects such as weld seam offset.

[0023] 2. By utilizing the welding head mounting holes and positioning post mounting holes of the toothed hollow rotating cylinder, along with the positioning post with scale lines, and in conjunction with the detachable grinding wheel cover and power mechanism, precise positioning of the welding point and docking benchmark can be achieved, and the pipe end face can be ground horizontally in an integrated manner without the need for visual judgment or separate tools, ensuring a flat end face and improving positioning accuracy and construction efficiency.

[0024] 3. The lifting guide component of the toothed hollow rotating cylinder mounting base can be used to precisely adjust the height of the toothed hollow rotating cylinder without deviation, adapting to the docking reference of HVAC pipes of different diameters; combined with two drive components and a deep groove ball bearing structure, it improves the stability of operation and adaptability, meeting the needs of various construction scenarios. Attached Figure Description

[0025] The accompanying drawings, which are provided to further illustrate this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application.

[0026] Figure 1 This is one of the structural schematic diagrams of an embodiment of the HVAC pipe welding auxiliary device for HVAC construction according to the present invention; Figure 2 This is a second structural schematic diagram of an embodiment of the auxiliary device for welding HVAC pipes in HVAC construction according to the present invention; Figure 3 This is a schematic diagram of the cross-sectional structure of the circular gear of the present invention.

[0027] 1-Bearing body; 2-Linear guide rail; 3-Moving slider; 4-Positive and negative toothed trapezoidal lead screw; 5-Parallel pneumatic gripper cylinder; 51-Pipe clamp; 6-Toothed hollow rotary cylinder; 61-Welding head mounting hole; 62-Positioning pin mounting hole; 63-Spherical gear; 7-Functional component; 71-Grinding wheel; 72-Grinding wheel cover; 9-Positioning pin; 10-Deep groove ball bearing; 16-Nitrile rubber anti-slip mat; 17-Screw support; 18-Lifting guide assembly. Detailed Implementation

[0028] To facilitate understanding and implementation of the present invention by those skilled in the art, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0029] Below, in conjunction with Figures 1 to 3This invention provides a detailed description of an auxiliary device for welding HVAC pipes during HVAC construction.

[0030] The HVAC pipe welding auxiliary device of the present invention includes: Entity 1; Linear guide rail 2 is installed on the top of the supporting body 1; Two movable sliders 3 are slidably mounted on the linear guide rail 2; A trapezoidal lead screw 4 with positive and negative threads is threaded to the side of the bearing body 1 and is threaded to the two movable sliders 3. The positive and negative threaded sections of the trapezoidal lead screw 4 are respectively threaded to the two movable sliders 3 to drive the two movable sliders 3 to move synchronously in opposite directions. A parallel air gripper cylinder 5 is fixed to the top of each movable slider 3. A pipe clamp 51 is installed on the top of the parallel air gripper cylinder 5. The pipe clamp 51 is used to clamp the HVAC pipe and achieve the initial connection of the two HVAC pipe sections by moving the movable slider 3. The toothed hollow rotating cylinder 6 installed in the middle of the bearing body 1 has a welding head mounting hole 61 and a positioning column mounting hole 62 on its cylinder wall. The output ends of the welding head mounting hole 61 and the positioning column mounting hole 62 are aligned with the axis of the toothed hollow rotating cylinder 6, and are used to install the welding head and the positioning column 9 respectively, so as to realize the positioning of the welding point and the pipeline docking reference. The functional component 7, which is detachably connected to the toothed hollow rotating cylinder 6, is a grinding wheel cover 72 with grinding wheels 71 fixedly installed on both sides. The grinding wheel cover 72 rotates with the toothed hollow rotating cylinder 6 to achieve horizontal grinding of the pipe end face. The power mechanism includes a spur gear 63 that meshes with the outer gear ring of the toothed hollow rotating cylinder 6, and a first driving member connected to the spur gear 63 for driving the toothed hollow rotating cylinder 6 to rotate. The toothed hollow rotating cylinder 6 can be moved up and down for adjustment, ensuring accurate alignment of HVAC pipe connection references.

[0031] In this invention, the supporting body 1 serves as the core support of the device. It is integrally formed from high-strength aluminum alloy, balancing stability and lightness. Two parallel linear guide rails 2 fixed at its top provide precise guidance for the moving sliders 3, ensuring that the moving sliders 3 move only along the axial direction. The threaded trapezoidal lead screws 4 are threaded to the two moving sliders 3 through positive and negative threads. When rotated, they can drive the moving sliders 3 to move synchronously in opposite directions, realizing pipe docking and separation. The parallel pneumatic gripper cylinders 5 at the top of each moving slider 3 adhere to the outer wall of the HVAC pipe through arc-shaped pipe clamps 51, using the cylinders to stabilize the clamping force and fix the pipe, preventing displacement. It should be noted that the parallel pneumatic gripper cylinders 5, as clamping components, can be replaced with electric cylinders or mechanical clamping components. Their clamping methods have been disclosed in the prior art, so it is not difficult for those skilled in the art to understand and modify them for use.

[0032] The toothed hollow rotating cylinder 6 in the middle of the supporting body 1 is vertically assembled. The welding head mounting hole 61 and the positioning post mounting hole 62 on the cylinder wall are aligned with the axis of the toothed hollow rotating cylinder 6 to ensure the accuracy of subsequent positioning and welding. The detachable functional component 7 is connected to the toothed hollow rotating cylinder 6. The grinding wheels 71 on both sides can rotate with the toothed hollow rotating cylinder 6. The power mechanism meshes with the outer gear ring of the toothed hollow rotating cylinder 6 through the circular gear 63 to transmit the power of the first driving component to the toothed hollow rotating cylinder 6, driving it to rotate. The toothed hollow rotating cylinder 6 supports up and down adjustment to adapt to different pipe diameter docking heights.

[0033] During operation, the two sections of HVAC pipe are first placed between the pipe clamps 51. The parallel air gripper cylinder 5 is vented to drive the pipe clamps 51 to clamp the HVAC pipe. The positive and negative toothed trapezoidal screw 4 is rotated to make the moving slider 3 move synchronously towards the pipe along the linear guide rail 2 to complete the initial docking. Then, the positioning pin 9 is inserted into the positioning pin mounting hole 62. The height of the toothed hollow rotating cylinder 6 is adjusted so that the positioning pin 9 fits the joint of the pipe. The positioning pin mounting hole 62 and the welding head mounting hole 61 are holes on the same outer circle line to ensure coaxiality during welding.

[0034] When grinding is required, install functional component 7, start the first drive unit, and the circular gear 63 drives the toothed hollow rotating cylinder 6 and the grinding wheel 71 to rotate. Move the slider 3 to bring the end face of the pipe close to the grinding wheel 71, and use the rotation trajectory of the grinding wheel 71 parallel to the end face to grind it smooth. It is recommended to perform grinding before using the positioning column 9. That is, after grinding, the height of the toothed hollow rotating cylinder 6 should be accurately determined, and during grinding, the grinding surface of the grinding wheel 71 should be in contact with the pipe cross-section. After grinding, remove functional component 7. Install the welding head on the welding head mounting hole 61, start the toothed hollow rotating cylinder 6 to drive the welding head to make a circular motion around the joint to complete the welding. Throughout the process, the clamping of the parallel air gripper cylinder 5 relies on compressed air on the construction site and does not require a dedicated power source. The double-hole coaxial design, guide rail guidance, and positive and negative threaded rod transmission together ensure accuracy. The height adjustment of the toothed hollow rotating cylinder 6 is fixed by a mechanical structure to prevent deviation during operation.

[0035] To further explain, the core of the positioning column 9's reference positioning is achieved through "scale calibration + axis alignment". The specific usage method, combined with the structural design and operational logic, is as follows: S1. Initial zero-position calibration: First, insert the positioning pin 9 into the positioning pin mounting hole 62 of the toothed hollow rotating cylinder 6, adjust the insertion depth of the positioning pin 9 so that the positioning pin mounting hole 62 is aligned with the 0 mark on the surface of the positioning pin 9. At this time, the lower end of the positioning pin 9, that is, the end that contacts the pipe, is exactly on the central axis of the toothed hollow rotating cylinder 6, thus establishing the reference zero position. S2. Positioning column displacement adjustment: According to the radius of the HVAC pipe to be welded, move the positioning column 9 so that the moving distance of the positioning column 9 precisely matches the pipe radius of the HVAC pipe. For example, if the pipe diameter is 50mm and the radius is 25mm, then move the positioning column 9 from 0 mark to 25mm. After moving, keep the position of the positioning column 9 fixed. S3. Initial positioning of the pipe: The pipe clamp 51 clamps the two sections of HVAC pipe, and drives the moving slider 3 to move along the linear guide rail 2, so that the two sections of HVAC pipe move closer to the toothed hollow rotating cylinder 6 until the pipe end face roughly corresponds to the lower end of the positioning column 9. S4. Fine adjustment of the height of the rotating cylinder: Observe whether the lower end of the positioning column 9 is in contact with the outer surface of the pipes on both sides. If not, rotate the lifting adjustment screw through the lifting guide assembly 18 to move the height of the toothed hollow rotating cylinder 6 up and down until the lower end of the positioning column 9 is in precise contact with the outer surface of both pipes at the same time. Because the toothed hollow rotating cylinder 6 can only achieve height adjustment in one direction, there is no need to worry about the toothed hollow rotating cylinder 6 shifting in other directions. Moreover, after fitting, by rotating the toothed hollow rotating cylinder 6, you can observe whether the lower end of the positioning column 9 is in continuous contact with the outer surface of the pipe, and you can also determine whether the pipe is elliptical. S5. Axis Alignment Confirmation: When the positioning column 9 is in contact with the outer surfaces of both pipes, the lower end of the positioning column 9 has been aligned with the axis of the toothed hollow rotating cylinder 6 through zero-position calibration, and the moving distance matches the radius of the pipe. At this time, the central axis of the toothed hollow rotating cylinder 6 and the central axis of the two pipe sections must be on the same straight line, thus completing the precise positioning of the docking reference. S6. Positioning and subsequent operations: Keep the height of the toothed hollow rotating cylinder 6 fixed, remove the positioning pin 9 from the positioning pin mounting hole 62, drive the moving slider 3 to make the two pipe sections accurately dock, and then grind or weld. Ensure that the welding point and the docking reference are always coaxial. Furthermore, if not completely removed, the end of the positioning pin 9 is suspended above the weld seam of the two pipes, and the left and right positions of the weld seam can be finely adjusted. Since the axis of the two pipes has been found, there is no need to worry that fine adjustment will cause the axis to shift.

[0036] This device replaces manual handling and visual alignment with a mechanical structure, solving the problems of pipe displacement and large docking deviations in traditional welding. It significantly reduces weld defects and leakage risks. The integrated design eliminates the need to move pipes during grinding, positioning, and welding; only component switching is required, significantly improving construction efficiency. The device is compatible with various pipe diameters, and its modular structure facilitates disassembly and maintenance. The lightweight aluminum alloy support body is easy to move, making it especially suitable for narrow construction spaces. No professional skills are required for operation, lowering the construction threshold and avoiding the problems of bulky and poorly adaptable traditional auxiliary devices.

[0037] The trapezoidal lead screw 4 with both positive and negative threads is rotatably supported on the lead screw support 17 of the bearing body 1 via a deep groove ball bearing 10. The power end of the trapezoidal lead screw 4 is connected to a second drive component. The bearing body 1 is welded to the two ends of the trapezoidal lead screw 4 with the lead screw support 17. The inner hole of the lead screw support 17 is interference-fitted with the deep groove ball bearing 10. The two ends of the trapezoidal lead screw 4 are inserted into the inner ring of the deep groove ball bearing 10 through the shaft shoulder. The power end is connected to the second drive component via a coupling. The second drive component is fixed to the side of the bearing body 1.

[0038] Preferably, the first and second driving components are stepper motors or manual cranks, with the stepper motors equipped with a speed adjustment module. Both the first and second driving components adopt a quick-release structure and are connected to the actuator via a universal coupling. The stepper motor is selected according to an appropriate model, and the matching driver integrates a speed adjustment module. The control panel knob can achieve stepless speed adjustment. The manual crank is designed to be foldable, with a ratchet mechanism at the connection end to achieve unidirectional drive and locking. The end of the crank is wrapped with an anti-slip rubber sleeve. The installation interface size of the two driving components is the same, and replacement only requires disassembling the fixing bolts and coupling. Furthermore, the stepper motor is equipped with an encoder, and the speed and position are closed-loop controlled by the PLC controller to improve rotational accuracy. The ratchet mechanism of the manual crank can be designed with multiple adjustable positions, with different positions corresponding to different transmission ratios to meet the needs of fine and rapid adjustment. For construction sites without power, a manual hydraulic drive device can be configured as a third drive option.

[0039] The device offers a choice of dual drive types, allowing it to adapt to different construction scenarios. The stepper motor's speed adjustment function can precisely match the speed requirements of welding and grinding processes. The foldable manual crank can be folded and stored when not in use, reducing the space occupied by the device, making it easy to transport and store, and greatly improving operational adaptability.

[0040] The clamping width of the pipe clamp 51 is at least ten centimeters, and the inner surface of the pipe clamp 51 is covered with a nitrile rubber anti-slip pad 16.

[0041] In this invention, the pipe clamp 51 is forged from high-strength alloy steel. A layer of nitrile rubber anti-slip pad 16 is bonded to the inner surface of the clamp with special adhesive. The surface of the anti-slip pad is pressed with a diamond anti-slip pattern, and the edges are wrapped to prevent them from falling off. The connection part between the pipe clamp 51 and the parallel air gripper cylinder 5 adopts a waist-shaped hole design, which can finely adjust the installation angle of the clamp.

[0042] Furthermore, the pipe clamps 51 are designed with various curvatures to adapt to HVAC pipes with different cross-sectional shapes such as round and square. The pipe clamps 51 are connected to the cylinder via quick snaps. The nitrile rubber anti-slip pads 16 can be fixed with detachable bolts, making them easy to replace individually after wear. Furthermore, a pressure sensor is embedded inside the pipe clamps 51, which issues a warning signal when the clamping force reaches a preset value. The addition of electrical components is considered based on cost requirements.

[0043] The wide clamping range of the pipe clamp 51 ensures the clamping stability and load-bearing strength of large-diameter HVAC pipes. The nitrile rubber anti-slip pad 16 enhances the clamping friction, effectively preventing the pipe from loosening and avoiding scratching the pipe surface during clamping. The waist-shaped hole design improves the installation adaptability of the clamp, ensuring that pipes of different specifications can be accurately clamped.

[0044] The mounting base of the toothed hollow rotating cylinder 6 is provided with a lifting guide assembly 18, which includes a guide groove and a guide seat. The guide seat is threadedly connected to a lifting adjustment screw whose end abuts against the bottom of the guide groove. The lifting guide assembly 18 can be adjusted up and down without offset in other directions.

[0045] In this invention, the bottom of the toothed hollow rotating cylinder 6 is welded with a mounting base. The lifting guide assembly 18 includes a guide seat and a guide groove. The guide seat is fixed to the bottom of the mounting cavity of the bearing body 1 by bolts. Its top protrusion forms a guide post. The guide groove is opened at the bottom of the mounting base and is clearance-fitted with the guide post. A threaded hole is opened at the non-interference position of the guide seat, and the lifting adjustment screw is screwed into it. The end is pressed against the bottom of the guide groove by contact. The top of the lifting adjustment screw is provided with an internal hexagonal hole for easy operation.

[0046] Furthermore, solid grease is applied to the mating surfaces of the guide post and the guide groove to reduce friction and wear during the adjustment process. Scale markings are added to the guide seat, and the pitch of the lifting adjustment screw is adjusted to achieve quantitative control of height adjustment. For scenarios requiring frequent height adjustments, the lifting adjustment screw can be replaced with a small electric push rod, and the lifting can be controlled by a button. As in the previous embodiment, the addition of electrical components is considered based on cost requirements.

[0047] The lifting guide assembly 18 has a simple and easy-to-operate structural design, which can achieve precise height adjustment of the toothed hollow rotating cylinder 6, and there is no deviation in other directions during the adjustment process. It can effectively adapt to the docking reference requirements of HVAC pipes of different diameters and improve the versatility of the device.

[0048] As another embodiment, the toothed hollow rotating cylinder 6 and its bottom mounting base can be removed separately and used as a grinding device or an automatically rotating welding device. Personnel can hold a heating and ventilation pipe in each hand and visually align it to weld the required shape. In other words, the automatically rotating welding device frees the hands from holding the welding head.

[0049] In this invention, the grinding wheel 71 is a diamond grinding wheel, and its rotation trajectory is parallel to the pipe's mating end face. The grinding wheel 71 is made of diamond, and its outer diameter is designed according to the end face size of the largest diameter HVAC pipe. Its inner diameter matches the mounting shaft of the grinding wheel cover 72 and is axially fixed by a locking nut to ensure no radial runout during rotation. Dust covers are provided on both sides of the grinding wheel cover 72, with a reasonable gap reserved between the dust covers and the grinding wheel 71. During installation, a dial indicator is used to calibrate the rotation trajectory of the grinding wheel 71 to ensure it remains parallel to the pipe's mating end face.

[0050] Furthermore, it is equipped with diamond grinding wheels of various grit sizes, and the quick-change structure enables convenient switching of grinding wheels. In the coarse grinding stage, a coarse-grit grinding wheel is selected to improve efficiency, while in the fine grinding stage, a fine-grit grinding wheel is selected to ensure flatness. A debris collection bag is installed on the grinding wheel cover 72 to collect grinding debris through negative pressure adsorption. Wear detection marks are set on the side of the grinding wheel 71 to remind operators to replace it in time.

[0051] Diamond grinding wheels have high hardness, strong wear resistance, and long service life. Their rotation trajectory is parallel to the pipe end face, ensuring a smooth grinding end face, reducing welding defects. The dust cover design effectively blocks grinding debris from flying, avoiding pollution of the construction site environment and protecting the safety of operators.

[0052] In this invention, the positioning post 9 has scale lines engraved on its surface. The positioning post 9 is made of stainless steel, and its diameter is fitted with the diameter of the positioning post mounting hole 62 with a clearance that is controlled within a reasonable range. The surface of the positioning post 9 is engraved with scale lines using laser engraving technology. The graduation value of the scale lines is set according to the requirements and the usage environment. The zero scale line is set in the middle of the positioning post 9, and positive and negative scales are marked on the upper and lower sides respectively. A circular anti-slip handle is provided on the top.

[0053] Furthermore, a magnetostrictive sensor is embedded inside the positioning post 9 to achieve digital display of alignment depth through displacement detection. The data is transmitted to the operation panel of the device in real time. Positioning post 9 accessories of different lengths are designed for pipes of different diameters to meet the positioning requirements of different docking gaps. The bottom of the positioning post 9 can be designed as a conical guide structure to facilitate quick insertion into the docking gap of two pipe sections.

[0054] The scale lines allow operators to intuitively read the adjustment distance of the positioning column 9, assisting in the quick calibration of the welding point and the pipe connection benchmark. No additional measuring tools are required, improving positioning accuracy and efficiency. The stainless steel material ensures that the positioning column 9 has good rigidity and corrosion resistance, and is not easily rusted or deformed due to high welding temperatures or the construction site environment.

[0055] In this invention, the two ends of the bearing body 1 are symmetrically welded with U-shaped handles. The handles are made of seamless steel pipes and the surface is powder coated with a bright yellow color. The welding parts between the handles and the bearing body 1 are reinforced with reinforcing ribs to ensure the load-bearing capacity of the handles. The handles are positioned on both sides of the center of gravity of the bearing body 1 so as not to affect the clamping and docking operations of the pipes. Furthermore, the handle is designed as a folding structure and is connected to the load-bearing body 1 via a hinge. When not in use, it can be folded to fit snugly against the load-bearing body 1. A removable rubber anti-slip sleeve is fitted on the grip part of the handle, and the inside of the rubber sleeve has raised anti-slip particles. For large construction sites, a removable roller assembly can be added to the bottom of the load-bearing body 1. The handle provides a convenient point of leverage for manual handling, solving the problem that traditional auxiliary devices are difficult to move due to their bulkiness. A single person can move and position the device on the construction site, making it especially suitable for working in narrow spaces. The powder-coated surface is not only aesthetically pleasing but also prevents the handle from rusting and extends its service life.

[0056] Preferably, the detachable connection between the functional component 7 and the toothed hollow rotating cylinder 6 is a threaded connection, and the direction of the thread is the same as the direction of the toothed hollow rotating cylinder 6.

[0057] In this invention, the connection between the functional component 7 and the toothed hollow rotating cylinder 6 is machined with fine thread, and the direction of the thread is the same as the working rotation direction of the toothed hollow rotating cylinder 6. The grinding wheel cover 72 has multiple connection holes evenly distributed around its circumference, and each connection hole is equipped with a spring washer. During installation, the connection holes of the grinding wheel cover 72 are aligned with the threaded holes of the toothed hollow rotating cylinder 6, and after manual tightening, they can be reinforced with tools such as wrenches.

[0058] Furthermore, thread-locking adhesive is applied to the threaded connection to further enhance the stability of the connection. Nylon lock nuts with anti-loosening function are used instead of ordinary bolts. For scenarios where functional components 7 need to be frequently replaced, the threaded connection can be replaced with a quick-release buckle structure. The grinding wheel cover 72 is provided with elastic buckles in the circumference, and the toothed hollow rotating cylinder 6 is provided with corresponding slots. Positioning pins are provided at the connection to ensure that the position of the grinding wheel 71 is accurate after the grinding wheel cover 72 is installed.

[0059] A protective shell is installed around the circumference of the spur gear 63. In this invention, the protective shell is made of thin steel plate by stamping, and the whole is a semi-enclosed box-shaped structure. Sufficient space is reserved inside for the spur gear 63 to mesh and drive with the toothed hollow rotating cylinder 6. The protective shell is connected to the bracket of the supporting body 1 through the mounting hole. After installation, a reasonable gap is reserved between its bottom and the tooth tip of the spur gear 63. An observation window is opened on the side of the protective shell, and the observation window is sealed with a transparent polycarbonate plate.

[0060] Furthermore, sound-absorbing cotton is pasted inside the protective shell to reduce noise generated during gear meshing. The polycarbonate panel of the observation window has a detachable structure and is fixed by a pressure strip, making it easy to clean dust and oil stains from the surface. A temperature sensor is added to the protective shell to monitor the temperature of the gear transmission parts in real time. When the temperature exceeds the preset value, an alarm signal is issued. The surface of the protective shell can be coated with anti-rust paint to improve its corrosion resistance. The addition of electrical components is considered based on cost requirements.

[0061] The protective shell effectively prevents foreign objects such as welding slag and dust from the construction site from getting into the gear meshing parts, avoiding gear jamming or wear. At the same time, it isolates the rotating gears from the operators, preventing accidental contact with rotating parts by hands or clothing and causing safety accidents. The transparent observation window allows operators to observe the gear meshing status and monitor the operating status without disassembling the protective shell.

[0062] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any transformations or substitutions that can be understood by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of the present invention.

Claims

1. An auxiliary device for welding HVAC pipes during HVAC construction, characterized in that, include: Supporting body (1); Linear guide rail (2) installed on the top of the bearing body (1); Two movable sliders (3) are slidably mounted on the linear guide rail (2); A trapezoidal screw (4) with positive and negative threads is threaded to the side of the bearing body (1) and threaded to the two movable sliders (3). The positive and negative threaded sections of the trapezoidal screw (4) are threaded to the two movable sliders (3) respectively, so as to drive the two movable sliders (3) to move synchronously towards each other or in opposite directions. A parallel air gripper cylinder (5) is fixed to the top of each of the moving sliders (3). A pipe clamp (51) is installed on the top of the parallel air gripper cylinder (5). The pipe clamp (51) is used to clamp the HVAC pipe and achieve the initial connection of the two HVAC pipes by moving the moving slider (3). The toothed hollow rotating cylinder (6) installed in the middle of the bearing body (1) has a welding head mounting hole (61) and a positioning column mounting hole (62) on its cylinder wall. The output ends of the welding head mounting hole (61) and the positioning column mounting hole (62) are aligned with the axis of the toothed hollow rotating cylinder (6) and are used to install the welding head and the positioning column (9) respectively, so as to realize the positioning of the welding point and the pipeline docking reference. The functional component (7) that is detachably connected to the toothed hollow rotating cylinder (6) is a grinding wheel cover (72) with grinding wheels (71) fixedly installed on both sides. The grinding wheel cover (72) rotates with the toothed hollow rotating cylinder (6) to achieve horizontal grinding of the pipe end face. The power mechanism includes a spur gear (63) meshing with the outer gear ring of the toothed hollow rotating cylinder (6), and a first drive member connected to the spur gear (63) for driving the toothed hollow rotating cylinder (6) to rotate. The toothed hollow rotating cylinder (6) is adjusted up and down by the lifting guide assembly (18) to find the HVAC pipe docking reference.

2. The auxiliary device for welding HVAC pipes in HVAC construction according to claim 1, characterized in that, The positive and negative tooth trapezoidal lead screw (4) is rotatably supported on the lead screw support (17) of the bearing body (1) by a deep groove ball bearing (10), and the power end of the positive and negative tooth trapezoidal lead screw (4) is connected to a second driving member.

3. The auxiliary device for welding HVAC pipes in HVAC construction according to claim 2, characterized in that, The first driving component and the second driving component are stepper motors or manual cranks, and the stepper motors are equipped with speed adjustment modules.

4. The auxiliary device for welding HVAC pipes in HVAC construction according to claim 1, characterized in that, The positioning pin mounting hole (62) and the welding head mounting hole (61) are holes on the same outer circle line.

5. The auxiliary device for welding HVAC pipes in HVAC construction according to claim 1, characterized in that, The clamping width of the pipe clamp (51) is at least ten centimeters, and the inner surface of the pipe clamp (51) is covered with a nitrile rubber anti-slip pad (16).

6. The auxiliary device for welding HVAC pipes in HVAC construction according to claim 1, characterized in that, The lifting guide assembly (18) is installed on the mounting base of the toothed hollow rotating cylinder (6), including a guide groove and a guide seat. The guide seat is threadedly connected to a lifting adjustment screw whose end abuts against the bottom of the guide groove. The lifting guide assembly (18) has no offset in other directions when it is adjusted up and down.

7. The auxiliary device for welding HVAC pipes in HVAC construction according to claim 1, characterized in that, The grinding wheel (71) is a diamond grinding wheel, and its rotation trajectory is parallel to the pipe docking end face.

8. The auxiliary device for welding HVAC pipes in HVAC construction according to claim 1, characterized in that, The surface of the positioning post (9) is engraved with scale lines.

9. The auxiliary device for welding HVAC pipes in HVAC construction according to claim 1, characterized in that, The detachable connection between the functional component (7) and the toothed hollow rotating cylinder (6) is a threaded connection, and the direction of the thread is the same as the direction of the toothed hollow rotating cylinder (6).

10. The auxiliary device for welding HVAC pipes in HVAC construction according to claim 1, characterized in that, The circumference of the spur gear (63) is fitted with a protective shell.

Images