Ultrasonic industrial pipe welding device

Abstract

The application discloses a kind of ultrasonic industrial pipe welding device related to pipe welding technical field, including machine body, welding head that can be telescopic along machine body, base and pay-off roll, further including film covering assembly, the film covering assembly includes: support frame, setting between welding head and base, and can vertically slide between welding head and base;Two transmission belts are arranged in an up-down distribution, and the pay-off roll is located on the same side of the two transmission belts.The application forms point-to-point clamping structure by corresponding upper and lower film pressing rods, can separate the protective film to be used in independent area, realizes the separate positioning and limiting of work station area protective film, completely blocks the deformation, damage to the used area and the transmission of to-be-released area, eliminates the defects of local damage pulling whole film body, edge skew stretching in traditional film running mode.

Description

Technical Field

[0001] This invention relates to the field of pipe welding technology, specifically to an ultrasonic industrial pipe welding device. Background Technology

[0002] Ultrasonic industrial pipe forming and welding equipment is a specialized automated device used in industrial production for the continuous forming and welding of pipes (plastic / metal). It generates local frictional heat at the pipe joint through high-frequency ultrasonic vibration and pressure, achieving solid-state fusion at the molecular or atomic level, and completing longitudinal and circumferential welding in the pipe forming process.

[0003] During the welding process of plastic or composite pipe fittings, a protective film needs to be applied between the weld joint and the fitting to prevent adhesion and scratches, and to improve the consistency and stability of the weld. This protective film needs to be pulled forward a certain distance after one use (some high-quality films can be used two or three times) to replace it. The existing coating methods mainly include the following two:

[0004] One method is manual lamination. Whether using a continuous film feeding method or a method where a single protective film is replaced after each use, it is all done manually, resulting in extremely low overall efficiency. The latter method, in particular, requires frequent replacements, making the efficiency problem even more pronounced.

[0005] The second is to use a continuous film-moving method, such as... Figure 1 As shown in Figure (a), this method uses two sets of symmetrically arranged conveyor rollers (marked A1 in the figure) distributed on both sides of the welding head and the base to convey and position the protective film on the unwinding roller. When the protective film needs to be replaced, the two sets of conveyor rollers rotate, pulling the used part (the area shown in the dashed box S in the figure) to one side (the pulling direction is shown by the dashed arrow) to achieve the replenishment of old and new film. However, this method has the following disadvantages:

[0006] like Figure 1 As shown in the top view of Figure (b), after the protective film has been used, the two sides (t1 and t2) of the used area between the two sets of conveyor rollers cannot remain horizontal; under the combined pressure of the welding head, the base and the pipe to be welded, this area is prone to significant deformation, stretching, and even damage.

[0007] To address the aforementioned problems, existing technologies, whether employing a single-sided active rotation of the conveyor roller with the other side and unwinding roller passively rotating, or a method using synchronous rotation of both conveyor rollers, cannot effectively solve the issue. This is because the protective film undergoes irreversible plastic deformation, rather than elastic deformation, due to the compression in the welding area; simple traction cannot restore its flatness. Furthermore, the edges (t1, t2) of the deformed area are irregular, and the point of application of the traction force is misaligned with the geometric center of the deformed area. Even with synchronous traction from both sides, the deformed protective film will still experience localized wrinkles or shifts as it passes between the conveyor rollers due to uneven distribution of residual stress within the material. In addition, if the original area is already damaged, the damaged point will form stress concentration during traction, and the damaged area is prone to further expansion along the stress concentration direction.

[0008] Therefore, when changing area S, the new protective film pulled by the unwinding roller will be subjected to uneven traction force and traction direction deviation because the two sides of t1 and t2 are not parallel. If the original area has been damaged, the damaged area is more likely to be further expanded during the traction process, resulting in the two sides being tilted and stretched instead of horizontal as shown in t3 and t4, which will affect the stability of subsequent film covering operations and may even prevent film covering from being carried out normally.

[0009] Based on this, the present invention designs an ultrasonic industrial pipe welding device to solve the above problems. Summary of the Invention

[0010] The purpose of this invention is to provide an ultrasonic industrial pipe welding device to solve the problems mentioned in the background art.

[0011] To achieve the above objectives, the present invention provides the following technical solution: an ultrasonic industrial pipe welding device, comprising a body, a welding head extendable along the body, a base, and an unwinding roller, and further comprising a coating assembly, wherein the coating assembly includes:

[0012] A support frame is positioned between the welding head and the base, and can slide vertically between the welding head and the base;

[0013] Two drive belts are arranged vertically, and the unwinding roller is located on the same side of the two drive belts;

[0014] Several pressure rods are evenly distributed on the outer surface of the two transmission belts, and the pressure rods on each transmission belt are evenly spaced.

[0015] When the pressure rod is in working condition, the pressure rod on the lower side of the upper transmission belt corresponds one-to-one with the pressure rod on the upper side of the lower transmission belt, and together clamps the protective film released by the positioning unwinding roller from both the upper and lower sides.

[0016] As a further embodiment of the present invention, a connecting block is provided between the pressing rod and the transmission belt. The connecting block is fixedly installed on the transmission belt, and the pressing rod and the connecting block can elastically slide in the horizontal direction to one side or the other side.

[0017] When the pressure rod is in working condition, only two sets of pressure rods are always in contact with each other among the two sets of transmission belts located on one side of the longitudinal movement path of the welding head.

[0018] A drive assembly is provided below the welding head. The drive assembly is used to push the pressure rods in working state on the far side and the far side of the longitudinal movement path of the welding head closer to each other before the welding head contacts the base, and to drive the pressure rods to automatically reset and separate after the ultrasonic welding is completed.

[0019] As a further aspect of the present invention, a graded locking assembly is provided between each pressure rod and its corresponding connecting block. The graded locking assembly includes a driving block, a horizontal plate elastically slidably connected to the connecting block, and two engaging units symmetrically distributed about the driving block. Each engaging unit includes:

[0020] A locking pin, the top of which is rotatably connected to a roller, and the locking pin is fixedly connected to the top of the drive block;

[0021] The primary card slot is located on the horizontal plate;

[0022] The secondary card slot is located on one side of the primary card slot, and the sidewalls of both the primary and secondary card slots on the side furthest from each other are sloped.

[0023] The transition plate is elastically rotatably connected to the inner wall of the horizontal plate, and remains vertical under normal conditions, located on the side of the secondary slot away from the primary slot;

[0024] A stop is slidably connected to the horizontal plate. One end of the stop extends into the first-level slot, and the other end is located between the first-level slot and the second-level slot.

[0025] When the drive block initially pushes the transition piece from one side to the other, the transition piece rotates to a horizontal state and its bottom end is blocked by the end of the stop; when the drive block moves into the first-level slot, it can push the stop to slide away from the transition piece.

[0026] As a further embodiment of the present invention, the pressing rod is elastically slidably connected to the driving block, the driving block is elastically slidably connected to the inner wall of the connecting block, and a first arc-shaped guide rod is provided on the side of each of the two transmission belts away from the unwinding roller. The first arc-shaped guide rod is fixedly connected to the side wall of the support frame. The first arc-shaped guide rod is inverted U-shaped. When the pressing rod moves to contact the first arc-shaped guide rod, it will drive the pressing rod to slide along the driving block, and then the top of the pressing rod will lift the horizontal plate.

[0027] Each of the horizontal plates is provided with a release unit, the release unit including a guide, the lower half of the guide is vertical and the top end extends outward at an angle; after the horizontal plate is lifted, the end of the stop will contact the guide and push it to the initial position.

[0028] As a further embodiment of the present invention, the driving assembly includes a positioning rod fixedly connected to the welding head and a contact wheel rotatably connected to the pressure rod. Push rods are fixedly provided at the bottom of both ends of the positioning rod, and the top of the push rod is vertical and the bottom ends are inclined to both sides respectively.

[0029] As a further embodiment of the present invention, all the pressing rods on one of the transmission belts are provided with slots, and all the pressing rods on the other transmission belt are slidably connected to the slots.

[0030] As a further embodiment of the present invention, a second arc-shaped guide rod is fixedly provided on the side of the support frame near the unwinding roller. The second arc-shaped guide rod is also in the shape of an inverted U, and the bottom end of the second arc-shaped guide rod is higher than the first arc-shaped guide rod.

[0031] As a further embodiment of the present invention, the support frame is elastically slidably connected to the machine body, and an integral contact end is provided on the support frame. After the positioning rod contacts the contact end, it will press down on the support frame.

[0032] Compared with the prior art, the beneficial effects of the present invention are:

[0033] This invention forms a point-to-point clamping structure through corresponding upper and lower pressure rods, which can separate the protective film to be used into independent areas, realize the individual positioning and limiting of the protective film in the work area, completely block the transmission of deformation and damage to the used area and the area to be released, and eliminate the defects of local damage pulling the whole film and edge skew stretching in the traditional film feeding method.

[0034] The telescopic movement of the pressure film rods is coordinated with the lifting and lowering of the support frame. Before the positioning rod presses down on the support frame, the distance between the two sets of pressure film rods is reduced. At this time, the two ends of the protective film are tightened, and the middle is naturally relaxed. With the subsequent descent of the support frame, the relaxed protective film will arch upward under the action of airflow, changing from a flat state to an arc-shaped cover, rather than a taut horizontal state. When the welding head is pressed down into place, the protective film will first cover the pipe fitting, and then gradually adhere to the pipe fitting as the welding head descends, avoiding excessive tension on the protective film during welding and further protecting the integrity of the film. The pressure film rods only close when the support frame descends and automatically release after the support frame resets, without interfering with the normal delivery and replacement of the protective film, ensuring a smooth and continuous process of film replacement, film covering, and welding. Attached Figure Description

[0035] Figure 1This is a schematic diagram of the coating process in the prior art of the present invention (wherein, (a) is a schematic diagram of the traction direction during the coating process in the prior art, and (b) is a schematic diagram of the protective film deforming in a top view).

[0036] Figure 2 This is a front view of the overall structure of the present invention;

[0037] Figure 3 This is a schematic diagram of the overall structure of the present invention;

[0038] Figure 4 This is a schematic diagram of the support frame of the present invention;

[0039] Figure 5 This is a schematic diagram showing the transmission belt and the pressure rod forming an independent area according to the present invention;

[0040] Figure 6 This is a schematic diagram of the welding head of the present invention descending to contact the positioning rod and the contact end;

[0041] Figure 7 This is a schematic diagram of the push rod and the contact wheel of the present invention in contact;

[0042] Figure 8 This is a schematic diagram showing the change in the distance between the two sets of pressure rods when the push rod contacts the contact wheel of the present invention (wherein, (a) is a schematic diagram before the change in the distance between the pressure rods, and (b) is a schematic diagram after the reduction in the distance between the pressure rods).

[0043] Figure 9 This is a schematic diagram of the positioning rod and the contact wheel of the present invention in contact;

[0044] Figure 10 This is a schematic diagram showing the distance between the pressure rod and the horizontal plate of the present invention;

[0045] Figure 11 This is a schematic diagram showing the connection relationship between the guide and the stop of the present invention;

[0046] Figure 12 This is a schematic diagram of the movement trajectory of the locking pin relative to the horizontal plate when it moves to the left.

[0047] Figure 13 This is a schematic diagram of the trajectory of the locking pin of the present invention as it moves from the rightmost side of the connecting block to the leftmost side (the endpoint of the locking pin's trajectory during this process is inside the first-level slot).

[0048] Figure 14 This is a schematic diagram of the present invention when the locking pin enters the first-level slot and pushes the stop to move along the horizontal plate;

[0049] Figure 15 This is a schematic diagram of the trajectory of the locking pin of the present invention moving to the left from the first-level locking slot;

[0050] Figure 16 This is a schematic diagram of the locking pin of the present invention moving from the leftmost side to the right, and the endpoint of the moving trajectory is the secondary locking slot;

[0051] Figure 17 This is a schematic diagram showing the positional relationship between the transmission belt, the first arc-shaped guide rod, and the second arc-shaped guide rod of the present invention.

[0052] Figure 18 This is a schematic diagram showing the spacing between the two pressure rods when they are separated in advance according to the present invention;

[0053] Figure 19 This is a schematic diagram of the two pressing rods of the present invention making circular motion around the center point of the drive shaft;

[0054] Figure 20 This is a schematic diagram showing the reverse friction generated when the two pressing rods of the present invention come into contact with the protective film.

[0055] The attached diagram lists the components represented by each number as follows:

[0056] 1. Welding head; 101. Machine body; 2. Base; 3. Unwinding roller; 301. Rewinding roller; 4. Support frame; 401. Contact end; 5. Drive belt; 6. Pressing rod; 601. Slot; 7. Connecting block; 8. Positioning rod; 9. Push rod; 10. Contact wheel; 11. Drive block; 12. Horizontal plate; 13. Locking pin; 14. Primary slot; 15. Secondary slot; 16. Transition plate; 17. Stop; 18. First arc-shaped guide rod; 19. Guide component; 20. Second arc-shaped guide rod. Detailed Implementation

[0057] Please see Figures 2-20 The present invention provides a technical solution: an ultrasonic industrial pipe welding device, including a body 101, a welding head 1 that can extend and retract along the body 101, a base 2, and a winding roller 3. A hydraulic rod is provided between the welding head 1 and the body 101 to control the extension and retraction of the welding head 1. The hydraulic rod is common knowledge in the art and the prior art, and will not be described in detail here. In actual use, a receiving groove matching the shape of the pipe is opened between the bottom of the welding head 1 and the top of the base 2. The receiving groove is common knowledge in the art and will not be shown in detail in the figure or described in the following.

[0058] It also includes a film coating assembly, which includes a support frame 4, two transmission belts 5 (the transmission belts 5 can be implemented using existing conveyor belts or chains, referred to here as transmission belts 5, and can rotate on the support frame 4) and several film pressing rods 6; the support frame 4 is set between the welding head 1 and the base 2, and can slide vertically between the welding head 1 and the base 2; the two transmission belts 5 are arranged vertically; the unwinding roller 3 is located on the same side of the two transmission belts 5; several film pressing rods 6 are evenly distributed on the outer surface of the two transmission belts 5; the film pressing rods 6 on each transmission belt 5 are evenly spaced; when the film pressing rods 6 are in working condition, the ends of the film pressing rods 6 on the lower side of the upper transmission belt 5 correspond one-to-one with the ends of the film pressing rods 6 on the upper side of the lower transmission belt 5, and together clamp the protective film released by the positioning unwinding roller 3 from both the upper and lower sides.

[0059] like Figures 2-4 As shown:

[0060] The protective film released by the unwinding roller 3 travels between the two transmission belts 5. The pressure rod 6 on the lower side of the upper transmission belt 5 corresponds one-to-one with the end of the pressure rod 6 on the upper side of the lower transmission belt 5, forming a point-to-point clamping from the upper and lower sides, thus constituting a stable positioning and limiting structure.

[0061] For clarity, in Figure 5 In the diagram, the positions of the four pressure rods 6 are marked as q1, q2, q3, and q4, respectively. Through the point-to-point clamping method described above, the protective film to be used between the welding head 1 and the base 2 can be stably confined within the "independent area," which is marked by a dashed frame Q in the diagram. The independent area Q is completely separated from the "used area" on the left and the "release area" on the right. During subsequent welding operations, even if the protective film in the independent area Q deforms or breaks, the deformation and breakage will not be transmitted to the film on the left and right sides of the independent area Q due to the positioning on the left side formed by q1 and q3 and the positioning on the right side formed by q2 and q4. This achieves the partitioning and isolation of the protective film and prevents the expansion of the deformation and breakage areas.

[0062] The process of new membrane replenishment and old membrane conveying is as follows: After the welding head 1 and the base 2 complete the pipe welding, the two transmission belts 5 operate synchronously, driving all the pressing rods 6 to rotate synchronously. The four points q1, q2, q3, and q4 move synchronously, and the independent area Q moves synchronously to the left. The limit state of the current independent area Q is released when the pressing rods 6 located at points q1 and q3 move to the leftmost end and flip upward. The two pressing rods 6 located at points q2 and q4 on the right side remain relatively stationary during the movement of the transmission belt 5, continuously positioning and pulling the protective film, thereby pulling the unwinding roller 3 to release the new protective film.

[0063] During this process, even if the pressure rods 6 at points q1 and q3 are disengaged from the clamping state and make an arc-shaped upward flipping motion along the transmission roller, the pressure rods 6 at points q2 and q4 still maintain their positioning function. This positioning is both the tail end positioning of the previous independent area Q and the front end positioning of the next independent area to be formed, which can firmly separate the independent area Q from the protective film of the right-side area to be released.

[0064] Even if the protective membrane inside the independent area Q is damaged or deformed, it will not interfere with the normal release of the protective membrane in the area to be released; after the membrane pressing rods 6 at points q2 and q4 move to the original points q1 and q3, a brand new independent area Q is formed, thus completing the cycle of old membrane transport and new membrane replenishment.

[0065] It is worth noting that: Figure 4 In the middle, a take-up roller 301 is rotatably installed at the end of the support frame 4 away from the unwinding roller 3. The take-up roller 301 is used to wind up the old film on the left side of the independent area.

[0066] This invention forms a point-to-point clamping structure through corresponding upper and lower pressure rods 6, which can separate the protective film to be used into independent areas, realize the individual positioning and limiting of the protective film in the work area, completely block the transmission of deformation and damage to the used area and the area to be released, and eliminate the defects of local damage pulling the whole film and edge skew stretching in the traditional film feeding method.

[0067] During the replenishment of new film and the conveying of old film, the pressure rod is positioned alternately at 6 points, which can ensure the stable conveying and removal of old film and the smooth release of new film. The film is protected by uniform force throughout the process, preventing displacement and skew, and maintaining the continuity of the coating operation. At the same time, the independent zone protection design can effectively prevent damage and deformation from affecting subsequent coating and welding processes, improve the quality of weld formation, and greatly improve the stability and production efficiency of coating.

[0068] A connecting block 7 is provided between the pressure rod 6 and the transmission belt 5. The connecting block 7 is fixedly installed on the transmission belt 5. The pressure rod 6 and the connecting block 7 can slide elastically to one side or the other side in the horizontal direction.

[0069] A drive assembly is provided below the welding head 1. The drive assembly is used to push the pressure rod 6, which is in working state, on the far side of the longitudinal movement path of the welding head 1 and the far side before the welding head 1 contacts the base 2. After the ultrasonic welding is completed, the pressure rod 6 is automatically reset and separated.

[0070] The drive assembly includes a positioning rod 8 fixedly connected to the welding head 1 and a contact wheel 10 rotatably connected to the pressure rod 6. Push rods 9 are fixedly provided at the bottom of both ends of the positioning rod 8. The top of the push rod 9 is vertical and the bottom is inclined to both sides respectively.

[0071] The support frame 4 is elastically slidably connected to the body 101. A spring 402 is fixed between the support frame 4 and the body 101. An integral contact end 401 is provided on the support frame 4. After the positioning rod 8 contacts the contact end 401, it will press down on the support frame 4.

[0072] All the pressing rods 6 on one of the drive belts 5 are provided with slots 601, and all the pressing rods 6 on the other drive belt 5 are slidably connected to the slots 601.

[0073] like Figure 2 , Figure 3 , Figures 6-8 and Figure 10 As shown:

[0074] In the initial state, spring 402 lifts the support frame 4, maintaining it at a fixed height; during welding operations, the pipe to be welded is placed in the receiving groove on the base 2, and then the welding head 1 moves downward toward the base 2. During this process, the positioning rod 8 descends synchronously with the welding head 1; Figure 7 As shown, after the positioning rod 8 moves down to the inclined part of the push rod 9 and contacts the contact wheel 10, it will push the contact wheel 10 and the pressure rod 6 together to slide along the connecting block 7 towards the center. One of the two pressure rods 6 that are opposite each other is provided with a slot 601, so that the two pressure rods 6 in the vertical direction become a whole. Before sliding, the distance between the two sets of pressure rods 6 is L. After sliding, the distance is reduced to L1 until the vertical part of the push rod 9 is in contact with the contact wheel 10 and the pressure rod 6 stops moving.

[0075] At the same time, the two ends of the positioning rod 8 will fit with the contact end 401 and press down the support frame 4, causing the support frame 4 to slide down along the body 101, while stretching the spring 402. After the support frame 4 moves down to the limit position, the protective film flatly covers the surface of the pipe fitting, the welding head 1 and the base 2 close the mold, and the pipe fitting welding is completed. After welding is completed, the welding head 1 moves up to reset, and the support frame 4 rises back to the initial height under the elastic force of the spring 402. The push rod 9 then disengages from the contact wheel 10. Under the elastic drive of the spring 701, the pressure rod 6 resets synchronously, and the distance between the two sets of pressure rods 6 returns from L1 to L.

[0076] In this invention, the telescopic movement of the pressure rod 6 is coordinated with the lifting and lowering of the support frame 4. Before the positioning rod 8 presses down on the support frame 4, the distance between the two sets of pressure rods 6 is reduced from L to L1. At this time, the two ends of the protective film are closed, and the middle is naturally relaxed. With the subsequent descent of the support frame 4, the relaxed protective film will arch upward under the action of airflow, changing from a flat state to an arc-shaped cover, rather than a taut horizontal state. When the welding head 1 is pressed down, the protective film will first cover the pipe, and then gradually adhere to the pipe as the welding head 1 descends, avoiding excessive tension of the protective film during welding and further protecting the integrity of the film. The pressure rod 6 only closes when the support frame 4 descends, and automatically releases after the support frame 4 resets, without interfering with the normal transportation and replacement of the protective film, ensuring a smooth and continuous process of film replacement, film covering, and welding.

[0077] When the pressure rod 6 is in working condition, only two sets of pressure rods 6 are always in contact with each other in the two sets of transmission belts 5 located on one side of the longitudinal movement path of the welding head 1. Specifically, there are only two pressure rods 6 in the two transmission belts 5 near the unwinding roller 3, that is, only q2 and q4 exist. The purpose is that if there are pressure rods 6 on the right side of q2 and q4 at the same time, it is easy for the pressure rods 6 at the q2 and q4 points to move to the left because the two pressure rods 6 on the right side position the protective film, resulting in deformation and tearing, which in turn affects the formation of the subsequent "independent area".

[0078] It is worth noting that: Figure 2 As shown, although it can be seen that there is a pressure rod 6 at point q5, to avoid the misleading notion that the positioning rod 8 will interfere with the pressure rod 6 at point q5 when it descends, please refer to the following: Figure 9 Although the pressure rod 6 at point q5 is located in the area below the positioning rod 8, the push rod 9 is located to the left of the pressure rod 6 at point q5, and the push rod 9 is fixed to the side of the positioning rod 8 near the welding head 1, but with a distance, so there will be no interference.

[0079] Each pressure rod 6 is equipped with a graded locking assembly between itself and its corresponding connecting block 7. The graded locking assembly includes a drive block 11, a horizontal plate 12 that is elastically slidably connected to the connecting block 7, and two locking units symmetrically distributed about the drive block 11. A spring 1201 is fixed between the horizontal plate 12 and the connecting block 7. The locking unit includes a locking pin 13, a primary locking groove 14, a secondary locking groove 15, a transition piece 16, and a stop 17. A roller is rotatably connected to the top of the locking pin 13, and the locking pin 13 is fixedly connected to the top of the drive block 11. The primary locking groove 14 is opened on the horizontal plate 12, and the secondary locking groove 15 is located on the primary locking plate 12. On one side of the card slot 14, the sidewalls of the primary card slot 14 and the secondary card slot 15 away from each other are both set as inclined surfaces. The transition piece 16 is elastically rotatably connected to the inner wall of the horizontal plate 12 (the specific structure is that a torsion spring is sleeved on the rotation shaft of the transition piece 16. The torsion spring is common knowledge in the art and the prior art, and will not be described in detail here). It is normally kept vertical and located on the side of the secondary card slot 15 away from the primary card slot 14. The stop 17 is slidably connected to the horizontal plate 12. One end of the stop 17 extends into the interior of the primary card slot 14, and the other end is located between the primary card slot 14 and the secondary card slot 15.

[0080] When the drive block 11 initially pushes the transition piece 16 from one side to the other, the transition piece 16 rotates to a horizontal state and its bottom end is blocked by the end of the stop 17. When the drive block 11 moves into the first-level slot 14, it can push the stop 17 to slide away from the transition piece 16.

[0081] The pressure rod 6 is elastically slidably connected to the drive block 11. A spring 3 1101 is fixed between the pressure rod 6 and the drive block 11. The drive block 11 is slidably connected to the inner wall of the connecting block 7. A spring 4 701 is fixed between the drive block 11 and the inner wall of the connecting block 7. A first arc-shaped guide rod 18 is provided on the side of each of the two transmission belts 5 away from the unwinding roller 3. The first arc-shaped guide rod 18 is fixedly connected to the side wall of the support frame 4. The first arc-shaped guide rod 18 is inverted U-shaped. When the pressure rod 6 moves to contact the first arc-shaped guide rod 18, it will drive the pressure rod 6 to slide along the drive block 11. Then the top of the pressure rod 6 will lift the horizontal plate 12.

[0082] like Figures 10 to 16 As shown, when the pressure rods 6 approach each other, the pressure rods 6 at points q1 and q3 move to the right, and the pressure rods 6 at points q2 and q4 move to the left. When the pressure rods 6 move away from each other, the directions of movement are opposite.

[0083] For some high-quality protective films, the replacement cycle is not immediately after a single welding, but can be extended to 2-3 welding cycles before replacement. After the first welding and coating of the protective film in an independent area, the support frame 4 and push rod 9 are reset. If the distance between the two pressure rods 6 is directly restored from L1 to the initial distance L at this time, the protective film in this area has been deformed under the joint pressure of the welding head 1, base 2 and pipe fitting. The protective film changes from a flat state to a locally stretched state. Forcibly restoring it to the original distance L can easily cause the protective film to be torn due to excessive tension, thus affecting the normal progress of subsequent coating operations. To this end, the present invention achieves graded adjustment of the reset distance of the pressure rods 6 through the graded cooperation of the primary slot 14 and the secondary slot 15: after the first coating is completed, the distance between the two pressure rods 6 is increased from L1 to L2; after the second coating is completed, the distance is increased from L1 to L3, where L3 < L2 < L. By gradually reducing the reset distance, deformation space is reserved for the next coating, reducing the probability of tensile damage to the protective film.

[0084] Let's take the movement of the pressure rod 6 to the left as an example. Figure 12 As shown, in the initial state, the pressure rod 6 is in the middle position, and the drive block 11 and the locking pin 13 are located between the two sets of locking units. When the push rod 9 pushes the contact wheel 10 to move to the left, the pressure rod 6 drives the drive block 11 and the locking pin 13 to slide to the left synchronously, so that the spring 701 on the left is compressed and the spring 701 on the right is stretched. Since the horizontal plate 12 and the connecting block 7 are elastically connected by the spring 1201, when the locking pin 13 moves horizontally to the left, its top end remains in contact with the bottom edge of the horizontal plate 12 and moves to the left synchronously. During the movement, it lifts the horizontal plate 12 upward and stretches the spring 1201. After the locking pin 13 enters the first-level locking groove 14, the horizontal plate 12 is reset under the elastic action of the spring 1201. Similarly, when the locking pin 13 moves to the second-level locking groove 15, it will first lift the horizontal plate 12 and then reset the horizontal plate 12.

[0085] As the locking pin 13 moves to its extreme left position, its trajectory relative to the horizontal plate 12 is as follows: Figure 12 The trajectory is shown by the dashed line P (where the arrow on the dashed line P points in the direction of movement); during this process, the locking pin 13 contacts the transition piece 16 which is in a vertical state, pushing the transition piece 16 to rotate to the left around the rotation axis. After the locking pin 13 passes the transition piece 16, the transition piece 16 returns to the vertical state under the action of the torsion spring; after the locking pin 13 moves to the left limit position, the vertical part of the push rod 9 is in contact with the contact wheel 10, so that the contact wheel 10, the pressure rod 6 and the drive block 11 are kept in position. At this time, the distance between the pressure rods 6 on the left and right sides is reduced from L to L1.

[0086] like Figure 13As shown, when the pressure rod 6 returns to its initial position from its left extreme position, the movement trajectory of the locking pin 13 relative to the horizontal plate 12 is the dashed trajectory P1. During this process, the top of the locking pin 13 contacts the transition piece 16 and pushes it to rotate to the right around the rotation axis to a horizontal state. After the transition piece 16 rotates to the horizontal, it abuts against the bottom side wall of the stop 17. The stop 17 limits the transition piece 16, keeping it horizontal during the sliding of the locking pin 13. This prevents the locking pin 13 from entering the secondary slot 15, and it can only pass through the secondary slot 15 and enter the primary slot 14. Under the elastic force of the spring 701, after the locking pin 13 enters the primary slot 14, it continues to move to the right to its extreme position and pushes the stop 17 along the horizontal plate 12 from... Figure 13 The R1 point is slid to the R2 point. After sliding to the R2 point, the distance between the end of the stop 17 and the transition piece 16 is greater than the length of the transition piece 16 after it rotates to the horizontal state, so that the subsequent transition piece 16 is no longer blocked by the stop 17 when it rotates to the side of the stop 17. At this time, the distance between the left and right pressure rods 6 is L2.

[0087] like Figure 15 As shown, during the second coating operation, the locking pin 13 moves to the left from inside the primary locking groove 14, with the trajectory dotted line being P2. During this process, it continues to push the transition piece 16 to rotate to the left, then moves to the left limit position, and then resets to the right.

[0088] like Figure 16 As shown, the trajectory dotted line during the right reset process is P3. Because the transition piece 16 loses the limiting obstruction of the stop 17, the locking pin 13 can directly enter the secondary slot 15 and achieve positioning. At this time, the locking pin 13 pushes the transition piece 16 upward, and the second film coating is completed. The distance between the left and right pressure rods 6 is stable at L3.

[0089] During the third film coating operation, the locking pin 13 moves to the left from inside the secondary locking groove 15 and remains in the secondary locking groove 15 after the film coating is completed. At this time, the protective film in the independent area has reached the end of its service life, and the transmission belt 5 can complete the old film transportation and new film replenishment by rotating.

[0090] Furthermore, even if the protective film inside the independent area has not reached its replacement cycle, if the protective film is visually damaged, stuck, or blackened, the transmission belt 5 can be started directly to replace it actively.

[0091] This invention, through the combination of a graded locking component and a multi-level slot, achieves graded adjustable reset spacing of the pressure rod 6. The spacing can be gradually reduced according to the number of times the protective film is used, preventing the protective film from tearing due to a sudden increase in tension after deformation. This significantly improves the utilization rate of the protective film and reduces production costs. The transition piece 16 and the stop piece 17 work together to achieve automatic limiting and automatic unlocking. The spacing can be adaptively adjusted for single, double, and triple film coating without manual intervention. The film coating process is highly continuous and less prone to jamming. For high-quality protective films, it can be reused 2 to 3 times. This solves the material waste caused by single-use replacement in traditional structures and avoids damage caused by film deformation and pulling during multiple uses, thus balancing production efficiency and welding quality.

[0092] Each horizontal plate 12 is provided with a release unit, which includes a guide 19. The lower half of the guide 19 is vertical and the top end extends outward at an angle. After the horizontal plate 12 is lifted, the end of the stop 17 will contact the guide 19 and push it to the initial position.

[0093] like Figure 17 As shown, when the protective film in an independent area needs to be replaced, there are two working conditions: the first is when the protective film reaches the end of its service life, and the transmission belt 5 is controlled by the program to actively move and change the film; the second is when the protective film is damaged within its service life, and the operator manually controls the transmission belt 5 to move and change the film. During the film replacement process, the film pressing rods 6 at positions q1 and q3 move to the left with the transmission belt 5 until they contact the end of the first arc-shaped guide rod 18. Then they move horizontally along the horizontal section of the first arc-shaped guide rod 18 and enter the arc section. During this process, the film pressing rods 6 at positions q1 and q3 move vertically and separate from each other.

[0094] When the two contact wheels 10 move away from each other, the pressure rod 6 moves to a specified distance and then contacts the end of the horizontal plate 12. Initially, the distance between the end of the pressure rod 6 and the horizontal plate 12 is L4 (e.g., ...). Figure 10 As shown), the horizontal plate 12 is pushed to slide upward along the connecting block 7, compressing the second spring 1201; during the upward sliding of the horizontal plate 12, the secondary slot 15 disengages from the locking pin 13, and then the fourth spring 701 drives the drive block 11 and the locking pin 13 to reset. During this process, the horizontal plate 12 synchronously drives the stop 17 to move; as shown Figure 11 As shown, after the stop 17 moves to contact the guide 19, it is pushed back to the initial state under the guidance of the upper inclined section of the guide 19; after the contact wheel 10 disengages from the first arc-shaped guide rod 18, the contact wheel 10 and the pressure rod 6 are reset synchronously, and the locking pin 13 also moves back to the initial position.

[0095] A second arc-shaped guide rod 20 is fixed on the side of the support frame 4 near the unwinding roller 3. The second arc-shaped guide rod 20 is also inverted U-shaped, and its bottom end is higher than the first arc-shaped guide rod 18.

[0096] like Figures 17 to 20 As shown, the bottom height of the first arc-shaped guide rod 18 is marked by a horizontal dashed line G, and the bottom height of the second arc-shaped guide rod 20 is marked by a horizontal dashed line G1. Only at the workstation with a height of G can the ends of the upper and lower sets of pressure rods 6 be in contact with each other.

[0097] When the contact wheel 10 at position q2 moves with the transmission belt 5, it transitions from the first arc-shaped guide rod 18 to the U-shaped transition section with the second arc-shaped guide rod 20. Figure 17 After contact (marked by dashed line G11), the contact wheel 10 slides down the drive block 11, causing the upper and lower sets of pressure rods 6 to be in an inclined state, with their ends separated and not in contact; when the contact wheel 10 moves to the horizontal section ( Figure 17 When marked with G12, move smoothly along the horizontal segment G12, maintaining a distance of L5 between each set of pressure rods 6 and the protective film. Figure 18 As shown, the pressure rod 6 continues to move to the left while maintaining the distance; until the contact wheel 10 disengages from the horizontal section G12, the pressure rod 6 is reset under the elastic force of the spring 1101, and the end is smoothly inserted into the slot 601 to complete the clamping and positioning of the protective film.

[0098] The above configuration ensures that when the contact wheel 10 contacts the U-shaped transition section G11, the upper and lower sets of pressure rods 6 neither adhere to each other nor contact the protective film. This is because when the pressure rods 6 rotate to the vicinity of the drive shaft of the transmission belt 5, they will rotate around the center of the drive shaft. Even if the surface of the pressure rods 6 is smooth, if they adhere to each other when in an inclined state, it is difficult to ensure that the positive pressure acts perpendicularly on the protective film. This can easily cause the pressure rods 6 to undergo slight displacement, which in turn creates a reverse frictional force on the protective film, leading to tearing and damage. By separating the pressure rods 6 in advance, this problem can be completely avoided, ensuring that the protective film remains intact.

Claims

1. An ultrasonic industrial pipe welding device, comprising a body (101), a welding head (1) extendable along the body (101), a base (2), and an unwinding roller (3), characterized in that, It also includes a coating assembly, the coating assembly comprising: The support frame (4) is located between the welding head (1) and the base (2) and can slide vertically between the welding head (1) and the base (2); Two drive belts (5) are arranged vertically, and the unwinding roller (3) is located on the same side of the two drive belts (5); Several pressure rods (6) are evenly distributed on the outer surface of two transmission belts (5), and the pressure rods (6) on each transmission belt (5) are evenly distributed; When the pressure rod (6) is in working condition, the pressure rod (6) on the lower side of the upper transmission belt (5) corresponds one-to-one with the end of the pressure rod (6) on the upper side of the lower transmission belt (5), and together clamps the protective film released by the positioning unwinding roller (3) from both the upper and lower sides. A connecting block (7) is provided between the pressing rod (6) and the transmission belt (5). The connecting block (7) is fixedly installed on the transmission belt (5). The pressing rod (6) and the connecting block (7) can slide elastically to one side or the other side in the horizontal direction. When the pressure rod (6) is in working condition, only two sets of pressure rods (6) are always in contact with each other among the two sets of transmission belts (5) located on one side of the longitudinal movement path of the welding head (1); A drive assembly is provided below the welding head (1). The drive assembly is used to push the pressure rod (6) in the working state on the far side of the longitudinal movement path of the welding head (1) to approach each other before the welding head (1) contacts the base (2). After the ultrasonic welding is completed, the pressure rod (6) is automatically reset and separated. Each pressure rod (6) is provided with a graded locking assembly between itself and the corresponding connecting block (7). The graded locking assembly includes a driving block (11), a horizontal plate (12) elastically slidably connected to the connecting block (7), and two engaging units symmetrically distributed about the driving block (11). The engaging unit includes: A locking pin (13) is rotatably connected to the top of the locking pin (13), and the locking pin (13) is fixedly connected to the top of the drive block (11). A primary card slot (14) is provided on the horizontal plate (12); The secondary card slot (15) is located on one side of the primary card slot (14), and the sidewalls of the primary card slot (14) and the secondary card slot (15) on the side away from each other are both set as inclined surfaces; The transition piece (16) is elastically rotatably connected to the inner wall of the horizontal plate (12), and remains vertical under normal conditions, and is located on the side of the secondary slot (15) away from the primary slot (14); The stop (17) is slidably connected to the cross plate (12). One end of the stop (17) extends into the first-level slot (14), and the other end is located between the first-level slot (14) and the second-level slot (15). When the drive block (11) pushes the transition piece (16) from one side to the other side for the first time, the bottom end of the transition piece (16) will be blocked by the end of the stop (17) after it rotates to a horizontal state; when the drive block (11) moves into the first-level slot (14), it can push the stop (17) to slide away from the transition piece (16).

2. The ultrasonic industrial pipe welding device according to claim 1, characterized in that: The pressing rod (6) is elastically slidably connected to the drive block (11), and the drive block (11) is elastically slidably connected to the inner wall of the connecting block (7). The two transmission belts (5) are provided with a first arc-shaped guide rod (18) on the side away from the unwinding roller (3). The first arc-shaped guide rod (18) is fixedly connected to the side wall of the support frame (4). The first arc-shaped guide rod (18) is inverted U-shaped. When the pressing rod (6) moves to contact the first arc-shaped guide rod (18), it will drive the pressing rod (6) to slide along the drive block (11). Then the top of the pressing rod (6) will lift the horizontal plate (12). Each of the horizontal plates (12) is provided with a release unit, the release unit including a guide (19), the lower half of the guide (19) is vertical and the top end extends outward at an angle; after the horizontal plate (12) is lifted, the end of the stop (17) will contact the guide (19) and push it to the initial position.

3. The ultrasonic industrial pipe welding device according to claim 2, characterized in that: The drive assembly includes a positioning rod (8) fixedly connected to the welding head (1) and a contact wheel (10) rotatably connected to the pressure rod (6). Push rods (9) are fixedly provided at the bottom of both ends of the positioning rod (8). The top of the push rod (9) is vertical and the bottom is inclined to both sides.

4. The ultrasonic industrial pipe welding device according to claim 3, characterized in that: All the pressing rods (6) on one of the drive belts (5) are provided with slots (601), and all the pressing rods (6) on the other drive belt (5) are slidably connected to the slots (601).

5. An ultrasonic industrial pipe welding device according to claim 2, characterized in that: The support frame (4) is fixed with a second arc-shaped guide rod (20) on the side near the unwinding roller (3). The second arc-shaped guide rod (20) is also inverted U-shaped, and the bottom end of the second arc-shaped guide rod (20) is higher than the first arc-shaped guide rod (18).

6. The ultrasonic industrial pipe welding device according to claim 3, characterized in that: The support frame (4) is elastically slidably connected to the body (101). The support frame (4) is provided with an integral contact end (401). After the positioning rod (8) contacts the contact end (401), it will press down on the support frame (4).

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