Plastic pipe hot air welding machine and control method thereof

Abstract

The invention relates to a plastic pipe hot air welding machine and a control method thereof, and relates to the field of plastic pipe welding, the plastic pipe hot air welding machine comprises a control box, a hot air mechanism arranged on the control box and used for blowing and heating a to-be-connected plastic pipe, and a clamping mechanism used for clamping the plastic pipe; the hot air mechanism comprises a heating head for placing the connecting part of the plastic pipe, an air supply pipe connected with the heating head and the control box and used for providing an air source, and a heat supply pipe connected to the heating head and used for supplying heat to the heating head; the heating head is provided with a placing groove for radially placing a plastic pipe, and air outlet heads are symmetrically arranged on the inner wall of the placing groove; the clamping mechanism comprises a lifting air cylinder and a clamping plate installed on the lifting air cylinder. The two ends of the clamping plate are provided with clamping assemblies used for clamping the two sections of plastic pipes correspondingly. The lifting air cylinder drives the clamping plate to ascend and descend so that the two sections of plastic pipes sleeved with the heat shrink pipes can be placed into the containing groove. The plastic pipe connecting device has the effect of improving the operation efficiency during plastic pipe connection.

Description

Technical Field

[0001] The invention relates to the field of plastic pipe welding, in particular to a plastic pipe hot air welding machine and a control method thereof. Background Art

[0002] Plastic pipes are widely used in various fields, and in actual use they often need to be connected due to insufficient length.

[0003] Traditional plastic pipe docking is usually done manually. The specific process is: after aligning the two sections of plastic pipe, put a heat shrink tube on the docking point, and then heat the heat shrink tube to shrink it and tightly wrap the two sections of plastic pipe to achieve the connection.

[0004] The above steps usually require the use of a hot air gun, which is inconvenient because the operator needs to hold the plastic pipe to be connected with one hand and hold and operate the hot air gun with the other hand. Summary of the Invention

[0005] In order to improve the operating efficiency when plastic pipes are connected through heat shrink tubes, the present invention provides a plastic pipe hot air welding machine and a control method thereof.

[0006] In a first aspect, the present invention provides a plastic pipe hot air welding machine, which adopts the following technical solution: A hot air welding machine for plastic pipes, comprising a control box, a hot air mechanism disposed in the control box and configured to blow air and heat the plastic pipes to be connected, and a clamping mechanism configured to clamp the plastic pipes; The hot air mechanism includes a heating head for placing the connection part of the plastic pipe, an air supply pipe connecting the heating head and the control box and for providing an air source, and a heat supply pipe connected to the heating head and for supplying heat to the heating head; the heating head has a placement groove for radially placing the plastic pipe, and the inner wall of the placement groove has symmetrical air outlets; The clamping mechanism includes a lifting cylinder and a clamping plate installed on the lifting cylinder; the two ends of the clamping plate have clamping components for clamping two sections of plastic tubes respectively; the lifting cylinder drives the clamping plate to rise and fall to place the two sections of plastic tubes with completed heat shrink tube sleeves into the placement groove.

[0007] By adopting the above technical solution, the two sections of plastic tubes are clamped on the clamping assembly, and then the heat shrink tube is put on the joint between the two sections. After completing the above steps, the lifting cylinder automatically drives the plastic tube down to the placement slot of the heating head. The air outlet head in the placement slot can blow hot air to the heat shrink tube, quickly heating and shrinking the heat shrink tube, so that the heat shrink tube tightly wraps the joint of the two sections of plastic tubes, thereby completing the connection of the two sections of plastic tubes. The above steps do not require manual holding of the hot air gun and the plastic tube at the same time, and the work efficiency is high.

[0008] Optionally, the clamping assembly includes an upper clamp and a lower clamp, the top of the lower clamp has a fixing rod, and the upper clamp is sleeved on the fixing rod; the fixing rod is provided with a compression spring for pressing the upper clamp to the lower clamp.

[0009] Optionally, the upper clamp and the lower clamp are bent in directions away from each other to form a through-hole for the plastic tube to pass through; a cover is rotatably provided on the top of the clamping plate to cover the top opening of the placement slot, and the cover is concave upward and has an arc surface; the air outlet includes a first air outlet and a second air outlet, and the openings of the first air outlet and the second air outlet can be rotated up and down to adjust.

[0010] By adopting the above technical solution, when the cover plate is closed on the top opening of the placement slot, the placement slot forms a hole with only two sides open. At this time, when the plastic tube is placed in the placement slot, the up and down directions of the air outlet are adjusted, and the wind blown out by the air outlet can form an axially rotating cyclone in the placement slot, thereby uniformly heating the heat shrink tube in the circumference, and the heat shrink tube in the entire placement slot can shrink due to the heat.

[0011] In a second aspect, the present application provides a control method for a plastic pipe hot air welding machine, which adopts the following technical solution: A control method for a plastic pipe hot air welding machine is applied to the plastic pipe hot air welding machine, comprising: Acquire clamping position images; determining from the clamping position image whether a plastic pipe to be connected extends into the clamping position; When the plastic tube to be connected is inserted, the preset heat shrink tube is controlled to enter the preset clamping position; Insert the two sections of plastic tubes to be connected from both ends of the heat shrink tube and check whether the connection is successful; When the two sections of plastic pipes to be connected are successfully connected, the plastic pipe installation image is captured; Performing image recognition on the plastic pipes to be connected from the plastic pipe installation image to determine the type of the plastic pipes, which includes segmented plastic pipes and continuous plastic pipes; For the segmented plastic pipe, the air outlet is controlled by a preset rotating connection method to blow hot air to the plastic pipe and make the plastic pipe rotate in the placement slot; For the continuous plastic pipe, the preset surrounding hot air method is used to control the air outlet to blow hot air and surround the placement tank for heating.

[0012] By adopting the above technical solution, the system can identify the type of plastic tube placed in the placement slot and determine whether the plastic tube is in segment or connected. For different types of plastic tubes, the system can effectively handle the situation of the plastic tube, so that the heat shrink tube can evenly connect the joints of the two sections of plastic tubes.

[0013] Optionally, methods for determining successful plastic pipe docking include: Extracting heat shrink tube features from the clamping position image, and determining a characteristic length of the heat shrink tube based on the heat shrink tube features; Determining the middle position of the heat shrink tube according to the characteristic length of the heat shrink tube; Controlling a clamping arm preset on the cover plate to clamp the middle portion of the heat shrink tube, and applying force to the middle portion of the heat shrink tube with a preset clamping force; Determining the plastic tube extension distance based on the characteristic length of the heat shrink tube and the middle position of the heat shrink tube; Inserting the plastic tube from both ends of the heat shrink tube according to the insertion distance of the plastic tube, and collecting the pressure exerted on the clamping arm; When the pressure reaches a preset compressive force, the clamping arm is controlled to release the heat shrink tube.

[0014] Optionally, also include: Based on the middle position of the heat shrink tube and a preset control distance, determining the positions of the control groups located on both sides of the middle position of the heat shrink tube; Controlling the clamping arm to clamp the middle position of the heat shrink tube and the control group position once with a preset detection force, and collecting the pressure surface area of ​​the middle position and the pressure surface area of ​​the control group; When the area of ​​the middle pressure surface is inconsistent with the area of ​​the control group pressure surface, the difference between the area of ​​the middle pressure surface and the area of ​​the control group pressure surface is calculated and defined as the dislocation area; Determining an adjustment distance based on the misalignment area and a preset plastic pipe diameter value; The plastic tube is controlled to be drawn out to both sides according to the adjustment distance.

[0015] Optionally, the rotation connection method includes: Determining a forward heating position and a rotation tangent point position according to the plastic pipe installation image; Controlling the first air outlet to face the forward heating position, and controlling the second air outlet to face the rotation tangent point position; Controlling the second air outlet to blow air at a preset starting wind speed, increasing the starting wind speed by a preset wind speed increment to reach a preset maximum wind speed, and identifying the rotation state of the plastic pipe according to the plastic pipe installation image; When the rotation state of the plastic pipe is consistent with a preset uniform rotation state, the maximum wind speed is reduced by a preset wind speed decrement to place the plastic pipe in a preset critical rotation state, the rotation speed of the plastic pipe is collected, and the heating temperature is matched according to the rotation speed of the plastic pipe; controlling the first air outlet to blow air at the heating temperature to the plastic tube so as to uniformly shrink the circumference of the heat shrink tube; When the rotation state of the plastic tube is inconsistent with the uniform rotation state, the first air outlet is controlled to be directed toward the rotation tangent point position and to blow air at the maximum wind speed; Simultaneously, the maximum wind speeds of the first wind outlet and the second wind outlet are adjusted, the maximum wind speed is reduced by the wind speed decrement to place the plastic pipe in the critical rotation state, and the rotation speed of the plastic pipe is collected; The heating temperature is matched according to the rotation speed of the plastic tube, and the first air outlet head and the second air outlet head are controlled to blow air at the heating temperature at the same time.

[0016] By adopting the above technical solution, when the two sections of plastic tubes are both in segment shape, due to the light weight of the plastic tubes, the wind blown out by the air outlet can drive the plastic tubes to rotate during the welding process, so that the circumference of the heat shrink tube can be evenly heated, and the joints of the plastic tubes can be tightly connected.

[0017] Optionally, also include: determining a characteristic length of the heat shrink tubing from the clamping position image; matching the lateral displacement speed of the plastic tube according to the rotation speed of the plastic tube; Determining the displacement time according to the characteristic length of the heat shrink tube and the lateral displacement speed of the plastic tube; The displacement time is defined as a cycle time, and at the end of each cycle time, the direction of the first air outlet head and the direction of the second air outlet head are swapped, and the number of cycle swaps is recorded; When the number of periodic adjustments reaches the preset rated number, the machine is shut down.

[0018] Optionally, the surrounding hot air method includes: determining a characteristic length of the heat shrink tubing from the clamping position image; Determining the extension length according to the characteristic length of the heat shrink tube and the preset axial length of the placement slot; Controlling the extension plate preset on the heating head and the cover plate to extend according to the extension length to extend the length of the placement slot, and controlling the extension plate to cover one section of the placement slot; determining a rotary heating position according to the plastic pipe installation image; The first air outlet head and the second air outlet head are controlled to blow air toward the symmetrical rotating heating positions respectively to form rotating wind in the placement slot.

[0019] By adopting the above technical solution, when the two sections of plastic tubes are continuous plastic tubes, since the plastic tubes cannot rotate, the placement groove is extended so that the heat shrink tube can be completely placed in the placement groove, and then the direction of the air outlet is adjusted so that the wind blown out by the air outlet can generate axially rotating wind in the placement groove. The wind can wrap and heat the entire section of the heat shrink tube, so that the heat shrink tube can be evenly heated and shrink to connect the two sections of plastic tubes.

[0020] Optionally, the top of the cover plate has a preparatory cavity for placing the heat shrink tube, the preparatory cavity has a material discharge channel connected to the placement groove, and further includes: Controlling the first air outlet and the second air outlet to blow air at a preset starting wind speed; Opening the material discharge channel and the double-sided baffles preset in the material discharge channel to preheat and shrink the middle portion of the heat shrink tube placed in the preparation chamber, and collecting the placement tank temperature; When the temperature of the placement tank reaches the preset starting temperature, the feeding channel is closed.

[0021] In summary, this application includes at least one of the following beneficial technical effects: By clamping two sections of plastic pipe on the clamping assembly, and then putting the heat shrink tubing at the joint between the two sections, after completing the above steps, the lifting cylinder automatically drives the plastic pipe down to the placement slot of the heating head, and the air outlet head in the placement slot can blow hot air to the heat shrink tubing, quickly heating and shrinking the heat shrink tubing, so that the heat shrink tubing tightly wraps the joint of the two sections of plastic pipe, thereby completing the connection of the two sections of plastic pipe. The above steps do not require manual holding of the hot air gun and the plastic pipe at the same time, and the work efficiency is high; When both sections of plastic tubes are in segment shape, due to the light weight of the plastic tubes, the wind blown out by the air outlet can drive the plastic tubes to rotate during the welding process, so that the circumference of the heat shrink tube can be evenly heated and the butt joints of the plastic tubes can be tightly connected; When the two sections of plastic tubes are continuous plastic tubes, since the plastic tubes cannot rotate, the placement slot is extended so that the heat shrink tube can be completely placed in the placement slot, and then the direction of the air outlet is adjusted so that the wind blown out by the air outlet can generate axially rotating wind in the placement slot. The wind can wrap and heat the entire section of the heat shrink tube, so that the heat shrink tube can be evenly heated and contracted to connect the two sections of plastic tubes. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the overall structure of Example 1 of the present invention; Figure 2 1 is a schematic structural diagram of a heating head according to embodiment 1 of the present invention; Figure 31 is a schematic structural diagram of a clamping mechanism according to embodiment 1 of the present invention; Figure 4 This is a schematic structural diagram of a hot air mechanism and a clamping mechanism according to a second embodiment of the present invention; Figure 5 2 is a schematic structural diagram of a heating head according to embodiment 2 of the present invention; Figure 6 It is a structural schematic diagram of the clamping mechanism of Example 2 of the present invention.

[0023] The names of the parts indicated by the numerical labels in the above drawings are as follows: 1. Control box; 2. Hot air mechanism; 21. Heating head; 211. Placement slot; 212. Air outlet; 2121. First air outlet; 2122. Second air outlet; 22. Air supply pipe; 23. Heat supply pipe; 3. Clamping mechanism; 31. Lifting cylinder; 32. Clamping plate; 33. Clamping assembly; 331. Upper clamp; 332. Lower clamp; 333. Fixing rod; 334. Compression spring; 335. Perforation; 34. Cover plate; 341. Arc surface; 342. Preparation cavity; 343. Unloading channel; 4. Extension plate. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] The embodiment of the present application discloses a hot air welding machine for plastic pipes. Example 1:

[0026] Reference Figure 1 A hot air welding machine for plastic pipes includes a control box 1, a hot air mechanism 2, and a clamping mechanism 3. The control box 1 serves as a control unit for controlling the entire welding process of the plastic pipe, and the control box 1 can provide an air source and a heat source to generate hot air. The hot air mechanism 2 and the clamping mechanism 3 are both installed on the control box 1, wherein the clamping mechanism 3 is used to clamp two sections of plastic pipes and facilitate the installation of a heat shrink tubing at the joint between the two sections. The hot air mechanism 2 is used to blow air and heat the heat shrink tubing installed at the joint of the plastic pipes so that the heat shrink tubing shrinks and tightly wraps the two sections of plastic pipes.

[0027] Reference Figure 1 and Figure 2 The hot air mechanism 2 includes a heating head 21 , an air supply pipe 22 and a heat supply pipe 23 .

[0028] The air supply pipe 22 is a cylindrical plastic pipe, which is connected to the control box 1. The air supply pipe 22 is hollow inside and is used for the air generated by the fan in the control box 1 to pass through.

[0029] The heating head 21 is made of metal and is heat-conducting. It has a placement slot 211 for the plastic tube to be placed vertically and radially, with two sides of the placement slot 211 running through it. The heating head 21 has air outlets 212 symmetrically arranged on the inner wall of the placement slot 211. The air outlets 212 are connected to the inner cavity of the air supply pipe 22, and the air is blown out from the air outlets 212.

[0030] The heat supply pipe 23 connects the control box 1 and the heating head 21 , and is powered by the control box 1 to generate heat in the resistance wire inside the heating head 21 , thereby making the wind blown out from the air outlet 212 have heat.

[0031] Reference Figure 1 and Figure 3 The clamping mechanism 3 includes a lifting cylinder 31 and a clamping plate 32.

[0032] The lifting cylinder 31 is installed on the base platform of the control box 1 and the push rod of the lifting cylinder 31 is vertically upward and can be vertically lifted and lowered.

[0033] The clamping plate 32 is mounted on top of the push rod of the lifting cylinder 31. The clamping plate 32 is C-shaped, with its ends facing the control box 1. A clamping assembly 33 is mounted on each end of the clamping plate 32, each used to clamp a section of plastic pipe. The area between the two ends of the clamping plate 32 forms a clamping position. When the clamping assembly 33 clamps the plastic pipe, the joint between the two sections of plastic pipe is located at the clamping position. Furthermore, the clamping position and the placement slot 211 are located in the same vertical plane.

[0034] The clamping assembly 33 includes an upper clamping piece 331 and a lower clamping piece 332. The lower clamping piece 332 is integrally formed with the clamping plate 32, and a fixing rod 333 is vertically mounted on the top of the lower clamping piece 332. The upper clamping piece 331 is mounted on the fixing rod 333, and the fixing rod 333 is mounted on a compression spring 334, which constantly presses the upper clamping piece 331 against the top of the lower clamping piece 332. The space between the lower clamping piece 332 and the upper clamping piece 331 is used to clamp the plastic tube.

[0035] Combine Figures 1 to 3 After the two sections of plastic pipes are installed on the clamping assembly 33 respectively, a heat shrink tube is set on the joint of the two sections of plastic pipes. Then the lifting cylinder 31 drives the clamping plate 32 to descend, and the clamping position falls into the placement groove 211. The joint of the plastic pipes at both ends, that is, the position of the heat shrink tube, enters the placement groove 211. At this time, the heating head 21 can blow air to connect the plastic pipes through the air outlet head 212. Example 2:

[0036] Compared with Example 1, the hot air welding machine for plastic pipes in Example 2 has the same structure except for the air outlet head 212, the clamping assembly 33 and the cover plate 34, which are not described in detail here.

[0037] Combine Figures 4 to 6In this embodiment, the upper and lower clamping plates 331 and 332 are bent away from each other to form a through-hole 335 for the plastic tube to pass through. A cover plate 34 is rotatably mounted on the top of the clamping plate 32. The bottom of the cover plate 34 is recessed upward to form an arcuate surface 341, which is located above the clamping position.

[0038] After the clamping assembly 33 completes clamping the plastic tube, the lifting cylinder 31 drives the plastic tube into the placement groove 211. At this time, the cover plate 34 can abut against the top opening of the placement groove 211 and cover the top opening, so that the placement groove 211 forms a complete hole with only two sides open.

[0039] Furthermore, the air outlet 212 on the inner wall of the heating head 21 includes a first air outlet 2121 and a second air outlet 2122, which are symmetrically arranged and are respectively located on one side of the inner wall of the heating head 21. In this embodiment, the opening of the air outlet 212 is arranged to rotate up and down on the inner wall of the heating head 21, so that the air outlet direction of the air outlet 212 can be adjusted.

[0040] By tilting the first air outlet 2121 and the second air outlet 2122 to blow air, the air generated can rotate axially within the placement slot 211 .

[0041] Based on the same inventive concept, an embodiment of the present invention provides a control method for a plastic pipe hot air welding machine.

[0042] A control method for a plastic pipe hot air welding machine comprises the following steps: Step S1: Acquire a clamping position image.

[0043] The clamping position image refers to an image obtained by photographing the clamping position between the two clamping assemblies 33 through a camera. The camera is fixedly mounted on the control box 1 to photograph the clamping position in real time. When the plastic pipe is installed in the clamping position, the plastic pipe can be identified in the clamping position image.

[0044] Step S2: determining from the clamping position image whether a plastic pipe to be connected extends into the clamping position.

[0045] By analyzing the clamping position image, it is determined whether there are plastic pipe features in the image, thereby determining whether the plastic pipe has been installed on the clamping mechanism 3. When the plastic pipe is installed, the system can proceed to the next step.

[0046] Step S3: When the plastic tube to be connected is inserted, the preset heat shrink tube is controlled to enter a preset clamping position.

[0047] If no plastic tube to be connected is inserted, the system continues to standby, and the camera continues to take real-time photos and identify the clamping position until a plastic tube is inserted.

[0048] When the plastic pipe is inserted, the system will feed the heat shrink tube to the clamping position so that the heat shrink tube can be placed at the joint when the two sections of plastic pipe are connected.

[0049] In this embodiment, the cover plate 34 is provided with a preparatory cavity 342, into which the heat shrink tubing is pre-cut and placed. A discharge channel 343 is provided between the preparatory cavity 342 and the clamping position. When the heat shrink tubing is needed, the system opens the discharge channel 343, allowing the tubing to pass through the discharge channel 343 and into the clamping position. The clamping position is reversed to provide a support plate for the heat shrink tubing. After the heat shrink tubing is discharged from the discharge channel 343, it rests on the support plate, allowing it to mate with the plastic tube. Once mated, the support plate retracts.

[0050] Step S4: inserting the two plastic tubes to be connected from both ends of the heat shrink tube, and determining whether the connection is successful.

[0051] After recognizing that the heat shrink tubing is in the clamping position, the system controls the insertion of two sections of plastic tubing from each end of the heat shrink tubing. During the insertion process, the system identifies and determines the butt joint of the plastic tubing to ensure that the two sections of plastic tubing are in end-to-end contact. The specific identification and determination method is not detailed here and will be described in detail in subsequent embodiments.

[0052] Step S5: When the two sections of plastic pipes to be connected are successfully connected, the plastic pipe installation image is collected.

[0053] The plastic tube installation image refers to the overall image of the two sections of plastic tubes collected by the camera after the heat shrink tube is installed. When collecting the plastic tube installation image, the lifting cylinder 31 has not yet lowered the plastic tube into the placement groove 211.

[0054] Step S6: performing image recognition on the plastic pipes to be connected in the plastic pipe installation image to determine the type of the plastic pipes, which includes segmented plastic pipes and continuous plastic pipes.

[0055] The plastic pipe type refers to the complete state of the two plastic pipe sections to be connected. A segmented plastic pipe refers to a single section of plastic pipe being connected. A connected plastic pipe refers to a complete plastic pipe consisting of two long sections. The difference between segmented plastic pipe and continuous plastic pipe is that both can rotate when circumferential force is applied.

[0056] The type of plastic pipe can be identified and analyzed from the plastic pipe installation image. The type is determined by analyzing the lengths of two sections of plastic pipe extending to both sides.

[0057] Step S60 : For the segmented plastic tube, the air outlet head 212 is controlled by a preset rotation connection method to blow hot air toward the plastic tube and rotate the plastic tube in the placement slot 211 .

[0058] For the segmented plastic pipe, since it can produce a rotating effect by blowing air when it is clamped in the through hole 335 of the clamping component 33, a rotary connection method is used to connect the two segments of plastic pipe. The specific method of the rotary connection method will not be described here, and will be described in detail in subsequent embodiments.

[0059] Step S61 : For the continuous plastic tube, the air outlet head 212 is controlled to blow hot air by a preset surrounding hot air method to heat the tube in the placement tank 211 in a surrounding manner.

[0060] For continuous plastic pipes, since the plastic pipes are long and heavy, they cannot be rotated. Therefore, the system uses a surrounding hot air method to control the air outlet 212 to heat and connect the plastic pipes. The specific method of the surrounding hot air method will not be described here and will be described in detail in subsequent embodiments.

[0061] The method for determining the success of plastic pipe docking includes the following steps: Step S40: extracting heat shrink tube features from the clamping position image, and determining a characteristic length of the heat shrink tube based on the heat shrink tube features.

[0062] The heat shrink tubing feature is the heat shrink tubing. After the plastic tube is inserted into the heat shrink tubing, the camera captures an image of the clamping position, identifying the heat shrink tubing from the image. The image is analyzed to determine the length of the heat shrink tubing in the image. Combined with the camera's pre-set image ratio, the actual length of the heat shrink tubing can be determined.

[0063] Step S400: determining the middle position of the heat shrink tube according to the characteristic length of the heat shrink tube.

[0064] The middle of the heat shrink tubing refers to the exact middle of the tubing along its length. When determining the characteristic length of a heat shrink tubing, the middle is the point on the tubing that is halfway between the two ends of the tubing.

[0065] Step S401: controlling the clamping arm preset on the cover plate 34 to clamp the middle position of the heat shrink tube, and applying force to the middle position of the heat shrink tube with a preset clamping force.

[0066] After determining the middle position of the heat shrink tube, the system controls the clamping arm to clamp and apply force to the middle position of the heat shrink tube. In this embodiment, the clamping mechanism 3 is integrated with the clamping arm, which clamps the middle position of the heat shrink tube during the process of inserting the plastic tube from both ends of the heat shrink tube.

[0067] In order to ensure that the plastic tube has a consistent insertion distance when inserted from both ends of the heat shrink tube, a clamping arm is used to clamp the heat shrink tube in the middle to limit the insertion process of the plastic tube.

[0068] The clamping force is a parameter set in advance by the technicians for the clamping arm. The clamping arm can flatten the heat shrink tube when clamping the heat shrink tube with the clamping force.

[0069] Step S402: determining the extension distance of the plastic tube based on the characteristic length of the heat shrink tube and the middle position of the heat shrink tube.

[0070] The plastic tube insertion distance refers to the insertion distance of the plastic tube to be connected when it is inserted from the end of the heat shrink tubing. Since the middle of the heat shrink tubing is clamped by the clamping arm, the plastic tube insertion distance is half of the characteristic length of the heat shrink tubing.

[0071] Step S403: inserting the plastic tube from both ends of the heat shrink tube according to the insertion distance of the plastic tube, and collecting the pressure exerted on the clamping arm.

[0072] When the plastic tube is inserted into the middle of the heat shrink tubing, it exerts pressure on the clamping arm through the heat shrink tubing. The clamping arm is equipped with a pressure sensor, which the system uses to determine the pressure.

[0073] Step S404: When the applied pressure reaches a preset compressive force, controlling the clamping arm to release the heat shrink tube.

[0074] The pressing force is a critical reference value set by the technicians for the clamping arm to be pressed against the plastic tube, which will not be described in detail here. When the pressure reaches the pressing force, it means that the plastic tube has been inserted into the middle of the heat shrink tube.

[0075] When the plastic tubes at both ends have been inserted to the middle of the heat shrink tube, the clamping arms are removed. At this time, the two sections of plastic tubes are just abutted inside the heat shrink tube.

[0076] The method for determining the success of plastic pipe docking also includes the following steps: Step S41: Based on the middle position of the heat shrink tube and a preset control distance, the positions of the control groups located on both sides of the middle position of the heat shrink tube are determined.

[0077] The control distance is a reference distance preset by technicians from the middle of the heat shrink tube. Even if the plastic tube is misplaced, it will not exceed the control distance, which facilitates data collection by the clamping arm. It will not be elaborated here.

[0078] The control point is a point on the heat shrink tubing that is the control distance from the center of the tubing. This point contains only one plastic tube. There are two control points, symmetrically located on either side of the center of the tubing.

[0079] When the middle position of the heat shrink tube is determined, extend the control distance to both sides, which is the position of the control group.

[0080] Step S410: controlling the clamping arm to clamp the middle position of the heat shrink tube and the control group position once with a preset detection force, and collecting the pressure surface area of ​​the middle portion and the pressure surface area of ​​the control group.

[0081] In this embodiment, the clamping arms are used to clamp the middle position of the heat shrink tube and the control position, and the difference between the pressure surfaces at the two positions is compared to determine whether the plastic tubes are successfully docked.

[0082] The test force is the force set by the technician for the clamping arm to clamp the middle position of the heat shrink tube and the control group position. Clamping with the test force is not likely to damage the plastic tube inside the heat shrink tube, so it will not be elaborated here.

[0083] The central pressure surface area refers to the contact area between the clamping arm and the heat shrink tubing when the clamping arm is clamped at the central position. The control pressure surface area refers to the contact area between the clamping arm and the heat shrink tubing when the clamping arm is clamped at the control position. After the clamping arm clamps and releases the central and control positions of the heat shrink tubing, the contact surface is deformed for a period of time. The corresponding area is determined by photographing and analyzing the deformed contact surface.

[0084] Step S411: When the area of ​​the middle pressure surface is inconsistent with the area of ​​the control group pressure surface, the difference between the area of ​​the middle pressure surface and the area of ​​the control group pressure surface is calculated and defined as the misalignment area.

[0085] Under normal circumstances, if the two sections of plastic pipe are properly docked, the area of ​​the middle pressure surface collected after clamping by the clamping arm should be consistent with the pressure surface area of ​​the control group, that is, both are the projected area of ​​a section of plastic pipe.

[0086] When the two sections of plastic pipe are misaligned during insertion, the central pressure surface area increases due to the misalignment. This area is different from the pressure surface area of ​​the control group. The misalignment area refers to the excess area of ​​the two sections of plastic pipe when misaligned compared to when properly joined. The misalignment area is the difference between the central pressure surface area and the pressure surface area of ​​the control group.

[0087] Step S412: determining an adjustment distance based on the misalignment area and a preset plastic pipe diameter.

[0088] The diameter of the plastic pipe is the basic parameter of the plastic pipe to be connected and will not be described in detail here.

[0089] Since the dislocation area is the projected area of ​​the extra plastic tube when two sections of plastic tubes are staggered, the projected area is the product of the diameter of the plastic tube and the length of the dislocated plastic tube. The adjustment distance is the length of the dislocated plastic tube. The adjustment distance is also the distance the plastic tube is pulled out from the end of the heat shrink tube when adjusting the plastic tube. Therefore, the adjustment distance is obtained by calculating the quotient value based on the dislocation area and the diameter of the plastic tube.

[0090] Step S413: Control the plastic tube to be drawn out to both sides according to the adjustment distance.

[0091] When the adjustment distance is determined, the system controls the plastic tube to be pulled out from both ends of the heat shrink tube by adjusting the distance so that the two sections of plastic tube are not misaligned and can be properly connected.

[0092] The rotation connection method includes the following steps: Step S600: determining the forward heating position and the rotation tangent point position according to the plastic pipe installation image.

[0093] The forward heating position refers to the position where the surface of the heat shrink tube is directly opposite to the air blown out by the air outlet head 212. The rotation tangent point position refers to the position where the surface of the heat shrink tube is tangent to the air blown out by the air outlet head 212.

[0094] By analyzing the plastic tube installation image, the characteristic position of the air outlet 212 and the characteristic position of the heat shrink tube are determined, and then the positions of the two are compared to determine the forward heating position and the rotation tangent point position.

[0095] In this embodiment, blowing air at the forward heating position can heat and shrink the heat shrink tube. Blowing air at the rotation tangent point position can drive the heat shrink tube to rotate and also heat and shrink the heat shrink tube, but due to the smaller heating area, the shrinking speed is slower.

[0096] Step S601: Control the first air outlet 2121 to face the forward heating position, and control the second air outlet 2122 to face the rotation tangent point position.

[0097] In this embodiment, the first air outlet 2121 is first directed toward the forward heating position, and the second air outlet 2122 is rotated toward the rotation tangent point position to ensure that the plastic tube and the heat shrink tube can shrink and rotate synchronously when one air outlet 212 is driven.

[0098] Step S602: Control the second air outlet 2122 to blow air at a preset starting wind speed, increase the starting wind speed by a preset wind speed increment and reach a preset maximum wind speed, and identify the rotation state of the plastic pipe according to the plastic pipe installation image.

[0099] The initial wind speed is the initial blowing speed of the air outlet 212 when the equipment is started, which is set by the technician and will not be described in detail here.

[0100] The wind speed increment is the increment of the initial wind speed gradually increasing per unit time pre-set by the technicians, which will not be described in detail here.

[0101] The air outlet 212 starts blowing at a relatively low speed, then gradually increases the initial speed by increments, and finally reaches the maximum speed to prevent the heat shrink tubing and the plastic tube from being adversely affected by the high initial speed. The maximum speed is the maximum speed of the air blown out by the air outlet 212 set by the technician, which will not be described in detail here.

[0102] The rotation state of the plastic pipe refers to the real-time state of the plastic pipe under the blowing of the air outlet 212, and can be determined by analyzing the plastic pipe installation image. By determining the rotation state of the plastic pipe at the maximum wind speed, it is determined whether the wind speed of the air outlet 212 needs to be adjusted.

[0103] In this embodiment, the first air outlet 2121 and the second air outlet 2122 are internally connected, and their wind speed and temperature are consistent. The difference is that the angles of the two can be different.

[0104] Step S603: When the rotation state of the plastic pipe is consistent with the preset uniform rotation state, the maximum wind speed is reduced by a preset wind speed decrement to put the plastic pipe in a preset critical rotation state, the rotation speed of the plastic pipe is collected, and the heating temperature is matched according to the rotation speed of the plastic pipe.

[0105] The uniform rotation state is one of the rotation states of the plastic pipe, that is, the plastic pipe is in the process of rotation and is not stationary.

[0106] When the rotation state of the plastic tube is consistent with the uniform rotation state at the maximum wind speed, it means that only one air outlet 212 is blowing air towards the rotation tangent point, which can drive the plastic tube to rotate, and even if the wind speed of the air outlet 212 does not reach the maximum wind speed, the plastic tube can still rotate. In this case, in order to prevent the rotation speed of the plastic tube from being too fast, the hot air blown out by the first air outlet 2121 can evenly heat the heat shrink tube, and the wind speed of the air outlet 212 needs to be reduced so that the plastic tube is in a critical state of rotation. The critical state of rotation refers to the state where the plastic tube just begins to rotate under the action of wind force, and the wind blown out by the air outlet 212 is relatively small at this time. The wind speed reduction is the amount of reduction in the maximum wind speed per unit time set by the technician, which will not be elaborated here.

[0107] The plastic pipe rotation speed refers to the speed at which the pipe reaches its critical rotational state. This speed is determined by capturing images of the pipe installation at intervals per unit time using a camera and analyzing the pipes in these images.

[0108] The heating temperature is the temperature of the air blown out by the first air outlet 2121. In this embodiment, the heating temperature is proportional to the rotation speed of the plastic tube. The lower the rotation speed of the plastic tube, the lower the heating temperature.

[0109] When hot air heats the heat shrink tubing, if the rotation speed of the heat shrink tubing is slow and the temperature of the hot air is high, the heat shrink tubing is prone to wrinkles due to shrinking too quickly. Therefore, the heating temperature is proportional to the rotation speed of the plastic tube.

[0110] Step S6030: Control the first air outlet 2121 to blow air to the plastic tube at the heating temperature to shrink the heat shrink tube uniformly in the circumference.

[0111] After determining the orientation parameters, temperature parameters, and wind speed parameters of the first air outlet 2121 and the second air outlet 2122 , the heat shrink tubing at the joint of the plastic tubes is heated according to the obtained parameters so that the heat shrink tubing is evenly wrapped around the joint of the plastic tubes.

[0112] Step S604: When the rotation state of the plastic tube is inconsistent with the uniform rotation state, the first air outlet 2121 is controlled to be directed toward the rotation tangent point position and to blow air at the maximum wind speed.

[0113] If the plastic tube's rotational state is inconsistent with its uniform rotational state at maximum wind speed, this means that when only one second air outlet 2122 is blowing air toward the heat shrink tube's rotational tangent point, even if air outlet 212 is blowing at maximum wind speed, it cannot drive the plastic tube to rotate. In this case, both air outlets 212 need to be simultaneously directed toward the heat shrink tube's rotational tangent point, so that the plastic tube is subjected to double the cumulative driving force from both air outlets 212. Therefore, the system also directs first air outlet 2121 toward the rotational tangent point and blows air at maximum wind speed. In this embodiment, the rotational tangent point directed by first air outlet 2121 and the rotational tangent point directed by second air outlet 2122 are symmetrically located on the surface of the heat shrink tube.

[0114] Step S6040: simultaneously adjusting the maximum wind speeds of the first air outlet 2121 and the second air outlet 2122, reducing the maximum wind speed by the wind speed decrement to put the plastic pipe in the critical rotation state, and collecting the rotation speed of the plastic pipe.

[0115] Consistent with step S603, the maximum wind speed of the air outlet 212 is reduced so that the plastic pipe rotates at a critical rotation state, and then the camera takes images of the plastic pipe installation at intervals per unit time, and image analysis is performed on the plastic pipes in the multiple plastic pipe installation images to determine the rotation speed of the plastic pipe.

[0116] Step S6041: matching the heating temperature according to the rotation speed of the plastic tube, and controlling the first air outlet 2121 and the second air outlet 2122 to blow air at the heating temperature at the same time.

[0117] Consistent with step S603 and step S6030, after determining the orientation parameters, temperature parameters and wind speed parameters of the first air outlet 2121 and the second air outlet 2122, the heat shrink tube at the joint of the plastic tubes is heated according to the obtained parameters so that it is evenly wrapped around the joint of the plastic tubes.

[0118] The rotation connection method also includes the following steps: Step S605: determining the characteristic length of the heat shrink tube from the clamping position image.

[0119] The characteristic length of the heat shrink tubing refers to the length of the tubing placed at the junction of two plastic tube sections. This characteristic length can be determined by analyzing the image of the tubing in the clamping position.

[0120] Step S606: matching the lateral displacement speed of the plastic pipe according to the rotation speed of the plastic pipe.

[0121] The plastic tube transverse displacement speed refers to the speed at which the plastic tube moves horizontally under the blowing drive of the air outlet head 212. The plastic tube transverse displacement speed is proportional to the plastic tube rotation speed. The faster the plastic tube rotation speed, the faster the plastic tube transverse displacement speed.

[0122] In this embodiment, after the plastic tube is installed in the through-hole 335 of the clamping assembly 33, when the plastic tube rotates, the plastic tube can move horizontally within the through-hole 335 synchronously, based on the same principle as threaded engagement. A threaded sleeve is located within the through-hole 335, threadedly engaging with the through-hole 335. The plastic tube is threaded through the threaded sleeve. When the plastic tube rotates, the sleeve rotates synchronously, thereby achieving synchronous horizontal movement under the threaded engagement.

[0123] Step S607: Determine the displacement time according to the characteristic length of the heat shrink tube and the lateral displacement speed of the plastic tube.

[0124] Because the heating head 21 has a fixed length, the air outlet head 212 can only heat and shrink a small section of the heat shrink tubing at a time. Furthermore, since the plastic tubing can move horizontally when the air outlet head 212 blows air onto it, the air outlet head 212 can completely heat the entire section of heat shrink tubing after a period of time. This period of time is referred to as the displacement time. The displacement time is the quotient of the characteristic length of the heat shrink tubing and the lateral displacement speed of the plastic tubing.

[0125] Step S608: defining the displacement time as a cycle time, swapping the orientation of the first air outlet 2121 and the orientation of the second air outlet 2122 at the end of each cycle time, and recording the number of cycle swaps.

[0126] In this embodiment, in order to shrink the heat shrink tube evenly, the heat shrink tube needs to be repeatedly blown and heated by the air outlet head 212. The time required to complete one stroke of heating and blowing is the cycle time, which is the displacement time.

[0127] After completing a heating cycle, the plastic tube needs to be controlled to move horizontally in the opposite direction. At this time, the direction of the first air outlet 2121 and the direction of the second air outlet 2122 need to be swapped so that the air outlet 212 applies force in opposite directions.

[0128] The number of cycle swaps refers to the number of times the heat shrink tubing completes a heating and blowing cycle. The system accumulates the number of cycle swaps after each heating cycle.

[0129] Step S609: When the number of periodic swaps reaches a preset rated number, the machine is shut down.

[0130] The rated times are the times set by the technicians for the air outlet head 212 to blow air back and forth to heat the heat shrink tubing. The system determines that after completing this number of cyclic heating cycles, the heat shrink tubing can completely and evenly wrap the plastic tube, which will not be elaborated here.

[0131] When the number of cycle swaps does not reach the rated number, the air outlet head 212 will continue to heat the heat shrink tubing. Only when the number of cycle swaps reaches the rated number will the system control the device to shut down to wait for the next round of welding.

[0132] Reference Figure 5 and Figure 6 The surrounding hot air method includes the following steps: Step S610: determining the characteristic length of the heat shrink tube from the clamping position image.

[0133] The process is the same as step S605 and will not be described in detail here.

[0134] Step S611: determining the extension length according to the characteristic length of the heat shrink tube and the preset axial length of the placement slot.

[0135] In this embodiment, extension plates 4 are retractably provided on both sides of the placement slot 211 of the heating head 21 and the both sides of the cover plate 34. The extension plates 4 are retractable under system control. When the extension plates 4 are extended, the axial length of the placement slot 211 can be increased.

[0136] The extended length refers to the extended length of the extension plate 4. The axial length of the extended placement slot 211 must be consistent with the characteristic length of the heat shrink tubing to ensure that the hot air within the placement slot 211 can heat the heat shrink tubing. The extended length is the difference between the characteristic length of the heat shrink tubing and the axial length of the placement slot. The axial length of the placement slot is a fundamental parameter inherent to the heating head 21 and will not be detailed here.

[0137] Step S612 : controlling the extension plate 4 preset on the heating head 21 and the cover plate 34 to extend according to the extension length to extend the length of the placement slot 211 , and controlling the extension plate 4 to cover one section of the placement slot 211 .

[0138] In this embodiment, the placement slot 211 is extended by extending the extension plate 4 so that the axial length of the placement slot 211 is consistent with the characteristic length of the heat shrink tube, and a flip cover is provided on one end of the extension plate 4, and the flip cover is controlled to be lowered to cover one end of the placement slot 211.

[0139] Step S613: determining a rotation heating position according to the plastic pipe installation image.

[0140] After the plastic tube and heat shrink tubing enter placement slot 211, a gap forms between the heat shrink tubing and the inner wall of placement slot 211. The rotary heating position is a location within this gap. When air outlet 212 blows air at this location, the generated air can rotate axially within placement slot 211, forming a rotating wind. This location is the rotary heating position, which can be determined by image analysis of the plastic tube installation image.

[0141] Step S614 : controlling the first air outlet head 2121 and the second air outlet head 2122 to blow air toward the symmetrical rotating heating positions respectively to form rotating air in the placement slot 211 .

[0142] After determining the rotational heating position, the system controls the first air outlet 2121 and the second air outlet 2122 to blow air toward the rotational heating position. The position toward which the first air outlet 2121 is directed is symmetrical with the position toward which the second air outlet 2122 is directed on either side of the heat shrink tube. At this time, because the top of the placement slot 211 is covered and one end of the placement slot 211 is also covered, a rotating airflow is formed within the placement slot 211. Part of the rotating airflow can exit toward the opening along the axial direction of the placement slot 211, while the other part of the rotating airflow can first move toward the closing direction and then exit in the opposite direction toward the opening. During the above process, there is always rotating airflow rotating around the heat shrink tube within the placement slot 211, so that the heat shrink tube can be heated evenly around its circumference.

[0143] Reference Figure 6 The pretreatment method of the heat shrink tube in the preparation cavity 342 includes the following steps: Step S7: controlling the first air outlet 2121 and the second air outlet 2122 to blow air at a preset starting wind speed.

[0144] The same as step S602 , both air outlet heads 212 blow air at the initial wind speed.

[0145] In this embodiment, since the wind speed and temperature of the air outlet head 212 are relatively low at the beginning, when the heat shrinkable tube in the placement groove 211 is heated by the air outlet head 212, the wind blown out by the air outlet head 212 can also heat the heat shrinkable tube in the preparatory cavity 342 through the discharge channel 343, so that the heat shrinkable tube in the preparatory cavity 342 shrinks in advance, so that the heat shrinkable tube can adapt to the diameter of the plastic tube without being too large.

[0146] Step S8: Open the discharge channel 343 and the double-side baffles preset in the discharge channel 343 to preheat and shrink the middle part of the heat shrink tube placed in the preparation cavity 342, and collect the placement tank temperature.

[0147] In this embodiment, when the two air outlets 212 begin blowing air at the starting wind speed, the system controls the opening of the material discharge channel 343 and installs double-sided baffles within the material discharge channel 343. These baffles narrow the width of the material discharge channel 343, making it smaller than the characteristic width of the heat shrink tubing. This prevents the heat shrink tubing from falling out even when the material discharge channel 343 is opened. Furthermore, when the air from the air outlets 212 heats the heat shrink tubing within the preparatory cavity 342, the baffles prevent the hot air from heating only the middle of the tubing, leaving both ends of the tubing at their original width, facilitating the insertion of plastic tubes from both sides.

[0148] The placement tank temperature refers to the ambient temperature inside the placement tank 211 under the action of hot air from the air outlet head 212 . The system collects the placement tank temperature through a temperature sensor integrated on the heating head 21 .

[0149] Step S9: When the temperature of the placement tank reaches a preset starting temperature, the material discharge channel 343 is closed.

[0150] The starting temperature is the temperature of the air blown out of the air outlet head 212 when the diameter of the heat shrink tube in the preparation cavity 342 is reduced to a specified width, which is set by the technician and will not be described in detail here.

[0151] It takes a certain amount of time for the air blown out by the air outlet head 212 to reach the starting temperature. During this time, the diameter of the heat shrink tube in the preparation cavity 342 can be reduced to the specified width. Therefore, when the air blown out by the air outlet head 212 reaches the starting temperature, the system controls the discharge channel 343 to be closed so that the width of the heat shrink tube in the preparation cavity 342 should not be too small.

[0152] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A hot air welding machine for plastic pipes, characterized in that: It comprises a control box (1), a hot air mechanism (2) arranged on the control box (1) and used to blow and heat the plastic pipe to be connected, and a clamping mechanism (3) used to clamp the plastic pipe; The hot air mechanism (2) comprises a heating head (21) for placing the connection portion of the plastic pipe, an air supply pipe (22) connecting the heating head (21) and the control box (1) and for providing an air source, and a heat supply pipe (23) connected to the heating head (21) and for supplying heat to the heating head (21); the heating head (21) has a placement groove (211) for radially placing the plastic pipe, and the inner wall of the placement groove (211) has air outlets (212) symmetrically arranged thereon; The clamping mechanism (3) comprises a lifting cylinder (31) and a clamping plate (32) mounted on the lifting cylinder (31); both ends of the clamping plate (32) are provided with clamping assemblies (33) for respectively clamping two sections of plastic tubes; the lifting cylinder (31) drives the clamping plate (32) to move up and down so as to place the two sections of plastic tubes with the heat shrink tubes installed thereon into the placement groove (211).

2. A plastic pipe hot air welding machine according to claim 1, characterized in that: The clamping assembly (33) comprises an upper clamping piece (331) and a lower clamping piece (332); the lower clamping piece (332) has a fixing rod (333) at the top, and the upper clamping piece (331) is sleeved on the fixing rod (333); the fixing rod (333) is provided with a compression spring (334) for pressing the upper clamping piece (331) against the lower clamping piece (332).

3. A plastic pipe hot air welding machine according to claim 2, characterized in that: The upper clamping piece (331) and the lower clamping piece (332) are bent in directions away from each other to form a through-hole (335) for the plastic tube to pass through; a cover plate (34) is rotatably provided on the top of the clamping plate (32) to cover the top opening of the placement slot (211); the cover plate (34) is concave upward and has an arc surface (341); the air outlet (212) includes a first air outlet (2121) and a second air outlet (2122); the openings of the first air outlet (2121) and the second air outlet (2122) can be rotated up and down to adjust.

4. A control method for a plastic pipe hot air welding machine, applied to a plastic pipe hot air welding machine as claimed in claim 3, characterized in that: include: Acquire clamping position images; determining from the clamping position image whether a plastic pipe to be connected extends into the clamping position; When the plastic tube to be connected is inserted, the preset heat shrink tube is controlled to enter the preset clamping position; Insert the two sections of plastic tube to be connected from both ends of the heat shrink tube and check whether the connection is successful; When the two sections of plastic pipes to be connected are successfully connected, the plastic pipe installation image is captured; Performing image recognition on the plastic pipes to be connected from the plastic pipe installation image to determine the type of the plastic pipes, which includes segmented plastic pipes and continuous plastic pipes; For the segmented plastic pipe, the air outlet head (212) is controlled by a preset rotation connection method to blow hot air to the plastic pipe and cause the plastic pipe to rotate in the placement groove (211); For the continuous plastic pipe, the air outlet head (212) is controlled to blow hot air using a preset surrounding hot air method and heat the pipe surroundingly in the placement tank (211).

5. The control method of a plastic pipe hot air welding machine according to claim 4, characterized in that: Methods for determining successful plastic pipe docking include: Extracting heat shrink tube features from the clamping position image, and determining a characteristic length of the heat shrink tube based on the heat shrink tube features; Determining the middle position of the heat shrink tube according to the characteristic length of the heat shrink tube; Controlling a clamping arm preset on the cover plate (34) to clamp the middle position of the heat shrink tube, and applying force to the middle position of the heat shrink tube with a preset clamping force; Determining the plastic tube extension distance based on the characteristic length of the heat shrink tube and the middle position of the heat shrink tube; Inserting the plastic tube from both ends of the heat shrink tube according to the insertion distance of the plastic tube, and collecting the pressure exerted on the clamping arm; When the pressure reaches a preset compressive force, the clamping arm is controlled to release the heat shrink tube.

6. The control method of a plastic pipe hot air welding machine according to claim 5, characterized in that: Also includes: Based on the middle position of the heat shrink tube and a preset control distance, determining the positions of the control groups located on both sides of the middle position of the heat shrink tube; Controlling the clamping arm to clamp the middle position of the heat shrink tube and the control group position once with a preset detection force, and collecting the pressure surface area of ​​the middle position and the pressure surface area of ​​the control group; When the area of ​​the middle pressure surface is inconsistent with the area of ​​the control group pressure surface, the difference between the area of ​​the middle pressure surface and the area of ​​the control group pressure surface is calculated and defined as the dislocation area; Determining an adjustment distance based on the misalignment area and a preset plastic pipe diameter value; The plastic tube is controlled to be drawn out to both sides according to the adjustment distance.

7. The control method of a plastic pipe hot air welding machine according to claim 4, characterized in that: The rotation connection method includes: Determining a forward heating position and a rotation tangent point position according to the plastic pipe installation image; Controlling the first air outlet (2121) to face the forward heating position, and controlling the second air outlet (2122) to face the rotation tangent point position; Controlling the second air outlet (2122) to blow air at a preset starting wind speed, increasing the starting wind speed by a preset wind speed increment and reaching a preset maximum wind speed, and identifying the rotation state of the plastic pipe according to the plastic pipe installation image; When the rotation state of the plastic pipe is consistent with a preset uniform rotation state, the maximum wind speed is reduced by a preset wind speed decrement to place the plastic pipe in a preset critical rotation state, the rotation speed of the plastic pipe is collected, and the heating temperature is matched according to the rotation speed of the plastic pipe; Controlling the first air outlet (2121) to blow air at the heating temperature to the plastic tube so as to uniformly shrink the circumference of the heat shrink tube; When the rotation state of the plastic tube is inconsistent with the uniform rotation state, the first air outlet (2121) is controlled to be directed toward the rotation tangent point position and to blow air at the maximum wind speed; Simultaneously, the maximum wind speeds of the first wind outlet (2121) and the second wind outlet (2122) are adjusted, the maximum wind speed is reduced by the wind speed reduction to place the plastic pipe in the critical rotation state, and the rotation speed of the plastic pipe is collected; The heating temperature is matched according to the rotation speed of the plastic tube, and the first air outlet head (2121) and the second air outlet head (2122) are controlled to blow air at the heating temperature at the same time.

8. The control method of a plastic pipe hot air welding machine according to claim 7, characterized in that: Also includes: determining a characteristic length of the heat shrink tubing from the clamping position image; matching the lateral displacement speed of the plastic tube according to the rotation speed of the plastic tube; Determining the displacement time according to the characteristic length of the heat shrink tube and the lateral displacement speed of the plastic tube; The displacement time is defined as a cycle time, and at the end of each cycle time, the direction of the first air outlet (2121) and the direction of the second air outlet (2122) are swapped, and the number of cycle swaps is recorded; When the number of periodic adjustments reaches the preset rated number, the machine is shut down.

9. The control method of a plastic pipe hot air welding machine according to claim 4, characterized in that: The surrounding hot air method comprises: determining a characteristic length of the heat shrink tubing from the clamping position image; Determining the extension length according to the characteristic length of the heat shrink tube and the preset axial length of the placement slot; The extension plate (4) preset on the heating head (21) and the cover plate (34) is controlled to extend by the extension length to extend the length of the placement slot (211), and the extension plate (4) is controlled to cover one section of the placement slot (211); determining a rotary heating position according to the plastic pipe installation image; The first air outlet (2121) and the second air outlet (2122) are controlled to blow air respectively toward the symmetrical rotating heating positions to form rotating wind in the placement slot (211).

10. The control method of a plastic pipe hot air welding machine according to claim 4, characterized in that: The top of the cover plate (34) is provided with a preparation cavity (342) for placing the heat shrink tube, the preparation cavity (342) having a material discharge channel (343) communicating with the placement groove (211), and further comprising: Controlling the first air outlet (2121) and the second air outlet (2122) to blow air at a preset starting wind speed; Opening the material discharge channel (343) and the double-sided baffles preset in the material discharge channel (343) to preheat and shrink the middle portion of the heat shrink tube placed in the preparation cavity (342), and collecting the placement tank temperature; When the temperature of the placement tank reaches a preset starting temperature, the material discharge channel (343) is closed.

Images