An automatic cooling welding tooling for the liquid retarder pipe of a hydrodynamic retarder

Abstract

The present invention relates to the field of welding, and discloses an automatic cooling welding tooling for the liquid retarder pipe of a hydraulic retarder, which includes a workbench. A fixing plate is vertically arranged on the workbench, and a plurality of pipe connection ports are opened on the fixing plate. A sealing cover is arranged on one side of the fixing plate. Telescopic holes are opened at the top and bottom of the water passing member. A telescopic cylinder is vertically arranged in the cavity of the water passing member, and both ends of the telescopic cylinder communicate with the telescopic holes. A telescopic body is arranged on the inner wall of the moving frame. A telescopic rod is arranged in the telescopic cavity, and a reset plate is arranged on the telescopic rod. A third spring is arranged between the reset plate and the inner wall of the telescopic cavity. A second pressure sensor is arranged on the inner wall of the telescopic cavity, and a buzzer alarm is also arranged. The present invention has the function of horizontal detection of the liquid retarder pipe, and can detect whether the liquid retarder pipe is in a horizontal state before welding. It has the function of preventing welding through, and can prevent the thin-walled liquid retarder pipe from being welded through during the welding of the liquid retarder pipe.

Description

Technical Field

[0001] The invention relates to the technical field of welding, in particular to an automatic cooling welding tool for a hydraulic retarder tube of a hydraulic retarder. Background Art

[0002] With the development of the automobile industry, there is an increasing demand for lightweight vehicles. Adding hydraulic retarders to heavy-duty vehicles is the most effective solution to reduce the original cooling water tank of the vehicle while ensuring safety.

[0003] The original hydraulic retarder hydraulic retarder pipes are mostly cast due to the small engine space, and the product itself is heavy. The latest technology is to use internal high pressure forming to meet the problem of small engine and vehicle space, and change the original casting wall thickness of 5-6mm to stainless steel material with a wall thickness of 1-1.5mm. Through internal high pressure forming, the shape of the existing pipes is changed while ensuring the flow rate to meet the design requirements of space size avoidance.

[0004] Liquid-delay pipes are usually welded with flanges, and usually encounter the following situations: before welding, it is necessary to ensure that the liquid-delay pipe is horizontal and vertical to the flange; during welding, welding slag will splash onto the surface of the pipe and need to be cleaned; after welding, the weld is too high and needs to be leveled and polished, and then the liquid-delay pipe needs to be cooled. If the heat of the workpiece cannot be conducted in time, it is easy to cause problems such as unqualified flatness of the welded workpiece and welding stress concentration. Since the pipe wall used for the internal high-pressure forming liquid-delay pipe is thin, it may even be directly welded through in severe cases, resulting in substandard sealing or strength, and the risk of leakage. If water spray cooling or water mist cooling is used, the cooling speed is faster, but the weld will absorb water, and the water will decompose into gases such as hydrogen, oxygen and water vapor, resulting in a significant decrease in the mechanical strength of the weld; if air cooling is used, the low-temperature inert gas takes away the heat, and the cooling efficiency is too low to meet production needs.

[0005] Moreover, no matter whether it is the existing water spray cooling or air cooling, the existing welding cooling only has a cooling function alone, and when the weld is too high, it cannot be detected and processed in time. Summary of the invention

[0006] The purpose of the present invention is to provide an automatic cooling welding tool for a hydraulic retarder's liquid retarder tube, aiming to solve the problems in the prior art that the liquid retarder tube and the flange are easily welded through during welding and are difficult to cool after welding.

[0007] The above technical objectives of the present invention are achieved through the following technical solutions:

[0008] An automatic cooling welding tooling for the liquid retarder pipe of a hydraulic retarder, comprising a workbench, on which a fixing plate is vertically arranged. A plurality of pipe connection ports are opened on the fixing plate. A sealing cover plate is arranged on one side of the fixing plate. An internal cooling water inlet pipe and an internal cooling water drain pipe are arranged on the sealing cover. Two cooling mechanisms are sequentially arranged from top to bottom on the side of the fixing plate away from the sealing cover, and the two cooling mechanisms are arranged oppositely;

[0009] The cooling mechanism includes a cooling box. A plurality of water passing members are arranged on the side of the two cooling boxes close to each other. The water passing members are in a semi-cylindrical shape. The opening of the water passing member located above faces downward, and the opening of the water passing member located below faces upward. A cavity is arranged inside the water passing member. An inlet pipe and an outlet pipe are also arranged on the water passing member. Two abutting blocks are arranged at the upper end and the lower end of the fixing plate. The bottom of the abutting block located above is arranged in an inclined surface, and the top of the abutting block located below is arranged in an inclined surface. A pressing wheel is arranged at the top of the cooling box located above and at the bottom of the cooling box located below. The pressing wheel is rotationally connected with the cooling box. A first cylinder is arranged on the fixing plate. The moving end of the first cylinder is connected with the abutting block, and the moving end of the first cylinder is in the horizontal direction;

[0010] The cooling mechanism further includes a moving frame, which is in an inverted U shape, and the openings of the two moving frames are arranged oppositely. A moving groove is vertically opened on the inner wall of the moving frame. Moving blocks matched with the moving groove are arranged on both sides of the cooling box. A first spring is arranged between the cooling box and the moving frame. When the first spring is in a natural state, a set distance exists between the two cooling boxes;

[0011] A driving mechanism for driving the cooling mechanism to move horizontally is further arranged on the workbench.

[0012] Through the above technical solution, the flange is fixed on the fixing plate. One end of the liquid retarder pipe is sequentially passed through the opening on the flange and the pipe connection port of the fixing plate. At the same time, the sealing cover is installed on the fixing plate, and the other end of the liquid retarder pipe is blocked with a sealing plug. The internal cooling water inlet pipe is opened. After the cold water enters the liquid retarder pipe, it then drains out from the internal cooling water drain pipe, and welding is started at the connection between the liquid retarder pipe and the flange. At this time, the inside of the liquid retarder pipe is filled with cold water, which can prevent the liquid retarder pipe from being welded through due to excessive welding temperature;

[0013] After welding is completed, the water in the liquid buffer tube is discharged, and the two cooling mechanisms are controlled by the driving mechanism to move toward the fixed plate at the same time. When the inclined surface of the abutment block contacts the lower pressure wheel, the cooling box is pressed down, and the cooling box moves downward along the movable groove, and the water-passing parts move downward accordingly. The two water-passing parts clamp the pipe, and the inner wall of the water-passing parts is in close contact with the outer surface of the pipe to conduct heat, so as to cool down the surface temperature of the end of the pipe close to the welding point, and prevent the mechanical properties from deteriorating due to the long duration of high temperature. The outer wall of the pipe is cooled by the cooling method of contact heat conduction, which is more efficient than air blowing cooling. After cooling is completed, the cooling mechanism is reset by the driving mechanism, and the abutment block is separated from the lower pressure wheel. Under the action of the first spring, the cooling box is reset, and the two water-passing parts are automatically separated, and the cooling work is completed.

[0014] The present invention is further configured as follows: a plurality of connecting holes are provided at one end of the water-passing piece close to the fixed plate and at the other end away from the fixed plate, a connecting tube is arranged inside the water-passing piece, two ends of the connecting tube are communicated with the connecting holes, a heat exchange tube is arranged in the connecting tube, two end surfaces of the heat exchange tube are closed, a coolant is arranged on the inner wall of the heat exchange tube, the length direction of the heat exchange tube is parallel to the axial direction of the water-passing piece, the outer wall of the heat exchange tube is in contact with the inner wall of the connecting tube, a limiting plate is arranged on the heat exchange tube, a connecting plate is arranged on the side of the cooling box away from the fixed plate, the vertical cross-section of the connecting plate is semicircular, a second spring is arranged between the connecting plate and the limiting plate, one end of the second spring is connected to the connecting plate, and the other end is connected to the limiting plate, the end of the heat exchange tube away from the fixed plate horizontally passes through the connecting plate, a second cylinder is arranged on the cooling box, and the moving end of the second cylinder is connected to the connecting plate.

[0015] Through the above technical solution, when the two water-passing parts clamp the tube for cooling, the second cylinder controls the connecting plate to push toward the weld. Under the action of the second spring, the heat exchange tube extends from the connecting tube, and the end contacts the weld to cool the weld. When the weld is uneven, the extended length of each heat exchange tube is different. The heat received by the end of the heat exchange tube is transferred from the coolant in the heat exchange tube to the inner wall of the heat exchange tube, and then conducted to the inner wall of the connecting tube, thereby conducting the heat to the water-passing parts to achieve cooling of the weld. The end of the heat exchange tube directly contacts the weld for heat conduction, and the cooling speed is fast.

[0016] A further setting of the present invention is that a scraper is provided at one end of the water-passing member close to the fixing plate. The scraper is arc-shaped, and the axis of the scraper is coaxial with the axis of the water-passing member. A pushing hole is formed in the scraper, and the pushing hole is directly opposite to the connecting hole. A movable plate is arranged on the scraper, and a torsion spring is arranged between the movable plate and the scraper. When the torsion spring is in a natural state, the movable plate covers the pushing hole, and a return spring is arranged between the scraper and the water-passing member.

[0017] Through the above technical solution, when the heat exchange tube extends out of the connecting cylinder, the end of the heat exchange tube abuts against the movable plate. At this time, the movable plate will not move under the action of the torsion spring. The heat exchange tube pushes the scraper forward, and the scraper fits against the outer wall of the tube. During the movement, the welding slag on the outer wall of the tube is scraped off. When the scraper moves forward to the weld seam, the scraper is abutted. At this time, the heat exchange tube continues to move forward, and the thrust gradually increases. The heat exchange tube pushes the movable plate away and passes through between the pushing holes. The end of the heat exchange tube contacts the weld seam, and the scraper resets under the action of the return spring.

[0018] A further setting of the present invention is that a detection plate is arranged on the side of the connecting plate away from the water-passing member. A first pressure sensor is arranged on the side of the detection plate close to the water-passing member. A detection lamp is also arranged on the detection plate. The detection lamp is electrically connected to the first pressure sensor. When the second spring is in a natural state, there is a set distance between the end of the heat exchange tube close to the detection plate and the detection plate.

[0019] Through the above technical solution, when a certain part of the annular weld seam is too high and cannot be leveled by the scraper, the corresponding heat exchange tube will move away from the weld seam. The end of the heat exchange tube touches the first pressure sensor, and the corresponding detection lamp lights up, prompting the staff that the weld seam at the corresponding position is too high and needs to be processed in time.

[0020] A further setting of the present invention is that the first air cylinder is wirelessly electrically connected to the first pressure sensor.

[0021] Through the above technical solution, when the height of a certain part of the weld seam is too high and the first pressure sensor is triggered, the first air cylinder receives an electrical signal and controls the upper and lower abutting blocks to move towards the end away from the lower pressing wheel. The two cooling boxes continue to move towards the weld seam under the action of the driving mechanism, and scrape the too-high welding slag accumulation near the weld seam flat. Compared with the heat exchange tube pushing the scraper, directly pushing the scraper by the driving mechanism has greater force and is easier to handle the welding slag with stronger adhesion force. It can automatically detect and level the weld seam, and has a relatively high degree of automation.

[0022] A further setting of the present invention is that: telescopic holes are formed at the top and bottom of the water passing member, a telescopic cylinder is vertically arranged in the cavity of the water passing member, both ends of the telescopic cylinder communicate with the telescopic holes, a telescopic body is arranged on the inner wall of the moving frame, a through port is formed on the cooling box, the telescopic body passes through the through port, a telescopic cavity is formed in the telescopic body, a telescopic rod is arranged in the telescopic cavity, a reset plate is arranged on the telescopic rod, a third spring is arranged between the reset plate and the inner wall of the telescopic cavity, a second pressure sensor is arranged on the inner wall of the telescopic cavity, a buzzer alarm is arranged on the cooling box, and the buzzer alarm is electrically connected to the second pressure sensor through a circuit.

[0023] Through the above technical solution, the telescopic rod extends out of the telescopic cylinder and contacts the surface of the pipe. The telescopic rod detects the horizontal position of the pipe. When one end of the pipe is high and the other end is low, the driving mechanism controls the horizontal movement of the cooling mechanism, and the telescopic rod will retract. When the end of the telescopic rod touches the second pressure sensor, the buzzer alarm is triggered, prompting the staff that the liquid retarder pipe is not in a horizontal state and the position of the liquid retarder pipe needs to be adjusted. It can detect the horizontal state of the pipe before welding or after welding.

[0024] A further setting of the present invention is that: the driving mechanism includes a horizontally arranged screw rod, a driving motor is arranged on the screw rod, a threaded member is arranged on the moving frame, and a threaded hole matching with the screw rod is formed on the threaded member.

[0025] Through the above technical solution, the rotation of the threaded rod is controlled by the driving motor, so as to drive the moving frame, the cooling box and the water passing member to move horizontally.

[0026] A further setting of the present invention is that: the second pressure sensor is wirelessly electrically connected to the first cylinder.

[0027] Through the above technical solution, when the second pressure sensor is triggered, it means that the liquid retarder pipe is not in a horizontal state. At this time, the first cylinder receives the signal and controls the two abutting blocks to move towards the side close to the water passing member. If the cooling mechanism is still moving towards the weld direction, the end of the abutting block will abut against the surface of the cooling box in advance by a certain distance, playing a limiting role to prevent the further movement of the cooling mechanism and prevent the cooling mechanism from cooling the welding part. At this time, the buzzer alarm also prompts the staff that the liquid retarder pipe after welding is not in a horizontal state, and the repair work can be carried out in time while the welding part has not completely cooled.

[0028] A further setting of the present invention is that: the second pressure sensor is wirelessly electrically connected to the driving motor.

[0029] Through the above technical solution, when the second pressure sensor is triggered, the drive motor controls the cooling mechanism to move back, preventing the cooling mechanism from cooling the welding point, and the staff can adjust or remove the welding workpiece.

[0030] The present invention is further configured as follows: a balance wheel is provided at one end of the telescopic rod close to the water passing member, and the balance wheel is rotatably connected to the telescopic rod.

[0031] Through the above technical solution, the connection between the balance wheel and the surface of the liquid buffer tube can prevent the telescopic rod from scratching the surface of the liquid buffer tube when the pressure is too high.

[0032] The method for welding and cooling a flange and a liquid retarder tube by using an automatic cooling welding tool for a liquid retarder tube of a hydraulic retarder of the present invention comprises the following steps:

[0033] S1. Fix the flange on the fixed plate, pass one end of the liquid buffer tube through the opening on the flange and the pipe port of the fixed plate in sequence, and install the sealing cover on the fixed plate at the same time. Turn on the driving motor, rotate the screw, drive the moving frame to move horizontally, and roll the balance wheel on the outer wall of the liquid buffer tube to detect the position of the liquid buffer tube. After the detection is completed, the driving motor is reversed to control the moving frame to reset, and the other end of the liquid buffer tube is blocked with a sealing plug. The inner cooling water inlet pipe is opened, and the cold water enters the liquid buffer tube and then is discharged from the inner cooling drain pipe. Then, the welding point between the liquid buffer tube and the flange is welded;

[0034] S2. After welding is completed, the driving motor is turned on again, the moving frame moves horizontally, the balancing wheel rolls on the liquid buffer tube, and the position of the liquid buffer tube is detected again. When the moving frame is close to the weld, the abutment block contacts the lower pressure wheel, the cooling box moves downward along the moving groove, the water-passing piece moves downward, and the two water-passing pieces clamp the liquid buffer tube. The inner wall of the water-passing piece is in close contact with the outer surface of the liquid buffer tube for heat conduction;

[0035] S3, turn on the second cylinder, the second cylinder controls the connection plate to move forward, under the action of the second spring, the heat exchange tube extends from the connection tube, the end of the heat exchange tube contacts the movable plate, the heat exchange tube pushes the scraper to move forward, the scraper fits the outer wall of the liquid buffer tube, and scrapes off the welding slag with weak adhesion, when the scraper moves forward to the welding place, the scraper is contacted, the heat exchange tube continues to move forward, the thrust gradually increases, the heat exchange tube pushes the movable plate open, passes through the pushing holes, the end of the heat exchange tube contacts the weld for heat exchange, and the scraper is reset under the action of the reset spring;

[0036] S4. When the welding slag has strong adhesion and the height of the welding slag is high, the heat exchange tube pushes the scraper to fail to scrape off the welding slag, and the heat exchange tube passes through the pushing hole and conflicts with the welding slag. At this time, the second cylinder controls the connecting plate to continue to move forward, and the end of the heat exchange tube close to the connecting plate contacts the first pressure sensor, sending an electrical signal, the detection light lights up, and the first cylinder starts to move at the same time, the conflict block moves backward, and the cooling box continues to move forward under the action of the drive motor and the screw. The driving force reaches the maximum, and the welding slag with strong adhesion on the surface of the liquid buffer tube is scraped off. At this time, the second cylinder controls the heat exchange tube to retract into the connecting tube and stops cooling the weld. When the cooling box moves to the limit, the welding slag is completely cleaned up. At this time, the driving motor controls the cooling box to retreat to a predetermined position, and the first cylinder controls the resistance block to move forward to press the cooling box down. The water-passing part clamps the liquid buffer tube for cooling. At this time, the second cylinder controls the heat exchange tube to extend from the connecting tube again to perform contact heat exchange on the weld.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] 1. The present invention prevents the liquid buffer tube from being welded through by passing water inside the liquid buffer tube. After welding is completed, the driving mechanism controls the cooling mechanism to move horizontally. When the inclined surface of the abutment block contacts the lower pressure wheel, the cooling box is pressed down, and the water-passing piece moves downward accordingly. The two water-passing pieces clamp the tube, and the inner wall of the water-passing piece is in close contact with the outer surface of the tube to conduct heat, so as to cool down the surface temperature of the end of the tube close to the welding point. At the same time, when the heat exchange tube extends from the connecting tube, the end of the heat exchange tube contacts the movable plate. At this time, the movable plate does not move under the action of the torsion spring, and the heat exchange tube pushes the scraper to move forward. The scraper moves, and the fitting part of the scraper fits with the outer wall of the tube. During the movement, the welding slag on the outer wall of the tube is scraped off. When the scraper moves to the flange and is resisted, the heat exchange tube continues to move forward and contacts the weld to exchange heat and cool the weld. When the weld is too high and the heat exchange tube cannot push the scraper to clean it, the other end of the heat exchange tube will contact the first pressure sensor, the detection light will light up, and the first cylinder will drive the resistance block to move. The scraper will continue to move forward under the action of the driving mechanism. The force of the driving mechanism pushing the scraper is much greater than the force of the heat exchange tube pushing the scraper, so the weld is forcibly scraped flat.

[0039] 2. The present invention detects the horizontal position of the pipe by setting a telescopic rod in contact with the surface of the pipe and a second pressure sensor. When one end of the pipe is high and the other end is low, the driving mechanism controls the horizontal movement of the cooling mechanism, and the telescopic rod retracts. When the end of the telescopic rod touches the second pressure sensor, the buzzer alarm is triggered, indicating to the staff that the liquid retarder pipe is not in a horizontal state and the position of the liquid retarder pipe needs to be adjusted. It can detect the horizontal state of the pipe before welding or after welding. At the same time, the movement of the contact block and the driving motor can be controlled through the second pressure sensor to stop the movement of the cooling mechanism. Before welding, it can remind the staff to adjust the position of the liquid retarder pipe in time. After welding, the welded products with position problems can be corrected or scrapped later, without the need to spend time cooling, saving the cooling time and improving the production efficiency.

[0040] 3. The present invention sets a movable heat exchange pipe, which can not only push the scraper to scrape the welding slag, but also contact the weld seam for heat exchange and cooling work, and can also automatically detect the too-high weld seam. When the weld seam is too high, the detection lamp can be lit to indicate the position of the too-high weld seam, and then switch to the driving mechanism to drive the scraper to forcibly scrape the uneven welding slag. One structure can achieve three functions, with more functions and higher automation degree compared with the general cooling equipment in the prior art. Brief Description of the Drawings

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0042] Figure 1 It is a schematic structural diagram of an embodiment of an automatic cooling and welding tooling for the liquid retarder pipe of a liquid retarder of the present invention;

[0043] Figure 2 It is a schematic structural diagram of an embodiment of an automatic cooling and welding tooling for the liquid retarder pipe of a liquid retarder of the present invention;

[0044] Figure 3 It is a schematic structural diagram of the cooling mechanism in an embodiment of an automatic cooling and welding tooling for the liquid retarder pipe of a liquid retarder of the present invention;

[0045] Figure 4 It is a schematic structural diagram of an embodiment of an automatic cooling and welding tooling for the liquid retarder pipe of a liquid retarder of the present invention;

[0046] Figure 5It is a schematic structural diagram of an embodiment of an automatic cooling welding tool for a hydraulic retarder tube of the present invention;

[0047] Figure 6 It is a schematic structural diagram of an embodiment of an automatic cooling welding tool for a hydraulic retarder tube of the present invention;

[0048] Figure 7 It is a sectional view of an embodiment of an automatic cooling welding tool for a hydraulic retarder tube of the present invention;

[0049] Figure 8 It is a sectional view of an embodiment of an automatic cooling welding tool for a hydraulic retarder tube of the present invention;

[0050] Figure 9 It is a schematic structural diagram of a cooling box in an embodiment of an automatic cooling welding tool for a hydraulic retarder tube of the present invention.

[0051] In the figure, 1, workbench; 2, fixed plate; 2a, connecting pipe opening; 3, sealing cover; 4, inner cooling water inlet pipe; 5, inner cooling water drain pipe; 6, cooling mechanism; 7, cooling box; 7a, moving block; 7b, through hole; 8, water passing member; 8a, cavity; 8b, connecting hole; 8c, connecting cylinder; 8d, telescopic hole; 8e, telescopic cylinder; 9, water inlet pipe; 10, water outlet pipe; 11, abutting block; 12, pressing wheel; 13, first cylinder; 14, moving frame; 14a, moving groove; 14b, threaded member; 15, first spring; 16, heat exchange tube; 17, limiting plate; 18, connecting plate; 19, second spring; 20, second cylinder; 21, scraping plate; 21a, pushing hole; 21b, movable plate; 21c, torsion spring; 21d, return spring; 22, detection plate; 23, first pressure sensor; 24, detection lamp; 25, telescopic body; 25a, telescopic cavity; 26, telescopic rod; 26a, reset plate; 27, third spring; 28, second pressure sensor; 29, buzzer alarm; 30, driving mechanism; 30a, screw; 30b, driving motor; 31, balance wheel. Detailed implementation manners

[0052] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts belong to the scope of protection of the present invention.

[0053] An automatic cooling welding tool for a hydraulic retarder tube provided by the present invention, as Figures 1 to 9As shown, it includes a workbench 1, on which a fixed plate 2 is vertically arranged. A plurality of pipe connection ports 2a are opened on the fixed plate 2. One side of the fixed plate 2 is provided with a sealing cover 3. An internal cooling water inlet pipe 4 and an internal cooling drain pipe 5 are arranged on the sealing cover 3. On the side of the fixed plate 2 away from the sealing cover 3, two cooling mechanisms 6 are arranged in sequence from top to bottom. The two cooling mechanisms 6 are arranged oppositely;

[0054] The cooling mechanism 6 includes a cooling box 7. A plurality of water passing members 8 are arranged on the side of the two cooling boxes 7 close to each other. The water passing member 8 is in a semi-cylindrical shape. The opening of the water passing member 8 located above faces downward, and the opening of the water passing member 8 located below faces upward. A cavity 8a is arranged inside the water passing member 8. An inlet pipe 9 and an outlet pipe 10 are also arranged on the water passing member 8. Two abutting blocks 11 are arranged at the upper end and the lower end of the fixed plate 2. The bottom of the abutting block 11 located above is arranged in an inclined plane, and the top of the abutting block 11 located below is arranged in an inclined plane. A pressing wheel 12 is arranged at the top of the cooling box 7 located above and at the bottom of the cooling box 7 located below. The pressing wheel 12 is rotatably connected to the cooling box 7. A first cylinder 13 is arranged on the fixed plate 2. The moving end of the first cylinder 13 is connected to the abutting block 11;

[0055] The cooling mechanism 6 further includes a moving frame 14. The moving frame 14 is in an "n" shape, and the openings of the two moving frames 14 face each other. A moving groove 14a is vertically opened on the inner wall of the moving frame 14. Moving blocks 7a are arranged on both sides of the cooling box 7 and are matched with the moving groove 14a. A first spring 15 is arranged between the cooling box 7 and the moving frame 14. When the first spring 15 is in a natural state, a set distance exists between the two cooling boxes 7;

[0056] A driving mechanism 30 for driving the cooling mechanism 6 to move horizontally is also arranged on the workbench 1.

[0057] Both ends of the water pipe 8, one end close to the fixed plate 2 and the other end far from the fixed plate 2, are provided with a plurality of connection holes 8b. A connection cylinder 8c is arranged inside the water pipe 8. Both ends of the connection cylinder 8c communicate with the connection holes 8b. A heat exchange tube 16 is arranged inside the connection cylinder 8c. Both end faces of the heat exchange tube 16 are closed. A coolant is arranged on the inner wall of the heat exchange tube 16. The length direction of the heat exchange tube 16 is parallel to the axis direction of the water pipe 8. The outer wall of the heat exchange tube 16 is in contact with the inner wall of the connection cylinder 8c. A limiting plate 17 is arranged on the heat exchange tube 16. A connecting plate 18 is arranged on the side of the cooling box 7 far from the fixed plate 2. The vertical section of the connecting plate 18 is semicircular. A second spring 19 is arranged between the connecting plate 18 and the limiting plate 17. One end of the second spring 19 is connected to the connecting plate 18, and the other end is connected to the limiting plate 17. The end of the heat exchange tube 16 far from the fixed plate 2 horizontally penetrates through the connecting plate 18. A second cylinder 20 is arranged on the cooling box 7. The moving end of the second cylinder 20 is connected to the connecting plate 18. One end of the water pipe 8 close to the fixed plate 2 is provided with a scraping plate 21. The scraping plate 21 is arc-shaped, and the axis of the scraping plate 21 is coaxial with the axis of the water pipe 8. A pushing hole 21a is arranged on the scraping plate 21. The pushing hole 21a is directly opposite to the connection hole 8b. A movable plate 21b is arranged on the scraping plate 21. A torsion spring 21c is arranged between the movable plate 21b and the scraping plate 21. When the torsion spring 21c is in a natural state, the movable plate 21b covers the pushing hole 21a. A return spring 21d is arranged between the scraping plate 21 and the water pipe 8. A detection plate 22 is arranged on the side of the connecting plate 18 far from the water pipe 8. A first pressure sensor 23 is arranged on the side of the detection plate 22 close to the water pipe 8. A detection lamp 24 is also arranged on the detection plate 22. The detection lamp 24 is electrically connected to the first pressure sensor 23 through a circuit. When the second spring 19 is in a natural state, there is a set distance between the end of the heat exchange tube 16 close to the detection plate 22 and the detection plate 22. The first cylinder 13 is wirelessly electrically connected to the first pressure sensor 23.

[0058] The top and bottom of the water-passing member 8 are provided with telescopic holes 8d, a telescopic tube 8e is vertically arranged in the cavity 8a of the water-passing member 8, both ends of the telescopic tube 8e are communicated with the telescopic hole 8d, a telescopic body 25 is arranged on the inner wall of the movable frame 14, a through opening 7b is arranged on the cooling box 7, the telescopic body 25 passes through the through opening 7b, a telescopic cavity 25a is arranged in the telescopic body 25, a telescopic rod 26 is arranged in the telescopic cavity 25a, a reset plate 26a is arranged on the telescopic rod 26, a third spring 27 is arranged between the reset plate 26a and the inner wall of the telescopic cavity 25a, a second pressure sensor 28 is arranged on the inner wall of the telescopic cavity 25a, and the A buzzer alarm 29 is provided on the cooling box 7, and the buzzer alarm 29 is connected to the second pressure sensor 28 through a circuit. The driving mechanism 30 includes a horizontally arranged screw rod 30a, and a driving motor 30b is provided on the screw rod 30a. A threaded member 14b is provided on the moving frame 14, and a screw hole matching the screw rod 30a is provided on the threaded member 14b. The second pressure sensor 28 is connected to the first cylinder 13 through a wireless circuit, and the second pressure sensor 28 is connected to the driving motor 30b through a wireless circuit. A balancing wheel 31 is provided at one end of the telescopic rod 26 close to the water-passing member 8, and the balancing wheel 31 is rotatably connected to the telescopic rod 26.

[0059] Through the above technical solution, the flange is fixed on the fixed plate 2, one end of the liquid buffer tube is passed through the opening on the flange and the pipe port 2a of the fixed plate 2 in sequence, and the sealing cover 3 is installed on the fixed plate 2 at the same time. The other end of the liquid buffer tube is blocked with a sealing plug, and the internal cooling water inlet pipe 4 is opened. After the cold water enters the liquid buffer tube, it is discharged from the cold water outlet pipe 10, and the connection between the liquid buffer tube and the flange is welded. At this time, the interior of the liquid buffer tube is filled with cold water, which can prevent the liquid buffer tube from being welded through due to excessively high welding temperature;

[0060] After welding is completed, the water in the liquid buffer tube is discharged, and the two cooling mechanisms 6 are controlled by the driving mechanism 30 to move toward the direction of the fixed plate 2 at the same time. When the inclined surface of the abutment block 11 contacts the lower pressure wheel 12, the cooling box 7 is pressed down, and the cooling box 7 moves downward along the movable groove 14a, and the water-passing piece 8 moves downward accordingly. The two water-passing pieces 8 clamp the pipe, and the inner wall of the water-passing piece 8 is in close contact with the outer surface of the pipe to conduct heat, so as to cool down the surface temperature of the end of the pipe close to the welding point, and prevent the mechanical properties from deteriorating due to the long duration of high temperature. The outer wall of the pipe is cooled by a cooling method of contact heat conduction, which is more efficient than air blowing cooling. After cooling is completed, the cooling mechanism 6 is reset by the driving mechanism 30, and the abutment block 11 is separated from the lower pressure wheel 12. Under the action of the first spring 15, the cooling box 7 is reset, and the two water-passing pieces 8 are automatically separated, and the cooling work is completed;

[0061] When two water - passing parts 8 clamp the pipe for cooling, the second cylinder 20 controls the connecting plate 18 to push towards the weld. Under the action of the second spring 19, the heat - exchange tube 16 extends out of the connecting cylinder 8c, and its end contacts the weld, cooling the weld. When the weld is uneven, the extending lengths of each heat - exchange tube 16 are different. The heat received by the end of the heat - exchange tube 16 is transferred from the coolant inside the heat - exchange tube 16 to the inner wall of the heat - exchange tube 16, and then conducted to the inner wall of the connecting cylinder 8c, thereby conducting the heat into the water - passing part 8 to achieve the cooling of the weld. The end of the heat - exchange tube 16 directly contacts the weld for heat conduction, and the cooling speed is fast;

[0062] When the heat - exchange tube 16 extends out of the connecting cylinder 8c, the end of the heat - exchange tube 16 abuts against the movable plate 21b. At this time, the movable plate 21b will not move under the action of the torsion spring 21c. The heat - exchange tube 16 pushes the scraper 21 forward, and the fitting part of the scraper 21 fits with the outer wall of the pipe. During the movement, the welding slag on the outer wall of the pipe is scraped off. When the scraper 21 moves forward to the weld, the scraper 21 is resisted. At this time, the heat - exchange tube 16 continues to move forward, and the thrust gradually increases. The heat - exchange tube 16 pushes the movable plate 21b away and passes through between the pushing holes 21a. The end of the heat - exchange tube 16 contacts the weld, and the scraper 21 resets under the action of the return spring 21d;

[0063] When a certain part of the annular weld is too high and cannot be scraped flat by the scraper 21, the corresponding heat - exchange tube 16 will move away from the weld. The end of the heat - exchange tube 16 touches the first pressure sensor 23, and the corresponding detection lamp 24 lights up, prompting the staff that the weld at the corresponding position is too high. At the same time, the first cylinder 13 receives an electrical signal and controls the upper and lower abutting blocks 11 to move towards the end away from the lower pressing wheel 12. The two cooling boxes 7 continue to move towards the weld under the action of the driving mechanism 30, scraping flat the too - high welding slag accumulation near the weld. Compared with the heat - exchange tube 16 pushing the scraper 21, using the driving mechanism 30 to directly push the scraper 21 has a greater force and is easier to handle the welding slag with stronger adhesion. It can automatically detect and automatically scrape flat the weld, and the degree of automation is relatively high;

[0064] The telescopic rod 26 extends out of the telescopic cylinder 8e and contacts the surface of the pipe. The telescopic rod 26 detects the horizontal position of the pipe. By controlling the rotation of the threaded rod through the driving motor 30b, the moving frame 14, the cooling box 7, and the water - passing part 8 are driven to move horizontally. When one end of the pipe is high and the other end is low, the telescopic rod 26 will retract. When the end of the telescopic rod 26 touches the second pressure sensor 28, the buzzer alarm 29 is triggered, prompting the staff that the liquid retarder pipe is not in a horizontal state and the position of the liquid retarder pipe needs to be adjusted. It can detect the horizontal state of the pipe before welding and also after welding;

[0065] When the second pressure sensor 28 is triggered, it means that the liquid buffer tube is not in a horizontal state. At this time, the first cylinder 13 receives a signal and controls the resistance block 11 located above to move downward. At this time, if the cooling mechanism 6 is still moving in the direction of the weld, the end of the resistance block 11 will conflict with the surface of the cooling box 7, preventing the cooling mechanism 6 from moving further, and preventing the cooling mechanism 6 from cooling the weld. At this time, the buzzer alarm 29 also reminds the staff that the liquid buffer tube is not in a horizontal state after welding, and repair work can be carried out in time before the weld is completely cooled. When the second pressure sensor 28 is triggered, the drive motor 30b controls the cooling mechanism 6 to move back to prevent the cooling mechanism 6 from cooling the weld.

[0066] The workflow of this technical solution is as follows:

[0067] Before welding, fix the flange on the fixed plate 2, pass one end of the liquid buffer tube through the opening on the flange and the pipe opening 2a of the fixed plate 2 in turn, and install the sealing cover 3 on the fixed plate 2 at the same time. The telescopic rod 26 extends from the telescopic cylinder 8e and contacts the surface of the pipe. The threaded rod is controlled to rotate by the driving motor 30b, thereby driving the moving frame 14, the cooling box 7 and the water-passing part 8 to move horizontally. The telescopic rod 26 detects the horizontal position of the pipe. When one end of the pipe is high and the other end is low, the telescopic rod 26 will retract. When the end of the telescopic rod 26 contacts the second pressure sensor 28, the buzzer alarm 29 is triggered to remind the staff that the liquid buffer tube is not in a horizontal state and the position of the liquid buffer tube needs to be adjusted. After the position of the liquid buffer tube is confirmed to be horizontal, the other end of the liquid buffer tube is blocked with a sealing plug, and the inner cooling water inlet pipe 4 is opened. After the cold water enters the liquid buffer tube, it is discharged from the cold water outlet pipe 10. The connection between the liquid buffer tube and the flange is welded. At this time, the inside of the liquid buffer tube is filled with cold water, which can prevent the liquid buffer tube from being welded through due to excessively high welding temperature;

[0068] After welding, the threaded rod is controlled to rotate by driving the motor 30b, thereby driving the movable frame 14, the cooling box 7 and the water-passing piece 8 to move horizontally toward the welding position. When the inclined surface of the abutment block 11 contacts the lower pressure wheel 12, the cooling box 7 is pressed down, and the cooling box 7 moves downward along the movable groove 14a, and the water-passing piece 8 moves downward accordingly. The two water-passing pieces 8 clamp the pipe, and the inner wall of the water-passing piece 8 is in close contact with the outer surface of the pipe for heat conduction. At this time, the second cylinder 20 controls the connecting plate 18 to push toward the welding seam. Under the action of the second spring 19, the heat exchange tube 16 extends out of the connecting tube 8c, and the end of the heat exchange tube 16 conflicts with the movable plate 21b. At this time, the movable plate 21b does not move under the action of the torsion spring 21c, and the heat exchange tube 16 pushes the scraper 21 to move forward. The fitting part of the scraper 21 fits with the outer wall of the tube. During the movement, the welding slag on the outer wall of the tube is scraped off. When the scraper 21 moves forward to the weld, the scraper 21 is resisted. At this time, the heat exchange tube 16 continues to move forward, and the thrust gradually increases. The heat exchange tube 16 pushes the movable plate 21b open and passes through the pushing holes 21a. The end of the heat exchange tube 16 contacts the weld to cool the weld. When the weld is uneven, the length of each heat exchange tube 16 is different. The heat received by the end of the heat exchange tube 16 is transferred from the coolant in the heat exchange tube 16 to the inner wall of the heat exchange tube 16, and then conducted to the inner wall of the connecting tube 8c, thereby conducting the heat to the water-passing part 8 to achieve cooling of the weld. The end of the heat exchange tube 16 directly contacts the weld for heat conduction, and the cooling speed is fast.

[0069] When a certain place of the annular weld is too high, the corresponding heat exchange tube 16 will move away from the weld, and the end of the heat exchange tube 16 will touch the first pressure sensor 23, and the corresponding detection light 24 will light up, prompting the staff that the weld at the corresponding position is too high. At the same time, the first cylinder 13 receives an electrical signal to control the upper and lower resistance blocks 11 to move toward the end away from the lower pressure wheel 12. The two cooling boxes 7 continue to move toward the weld under the action of the driving mechanism 30 to scrape the excessively high slag accumulation near the weld flat. Compared with the heat exchange tube 16 to push the scraper 21, the driving mechanism 30 is used to directly push the scraper 21, which has greater force and is easier to handle slag with strong adhesion. The weld can be automatically detected and automatically scraped flat, and the degree of automation is high.

[0070] The method for welding and cooling a flange and a liquid retarder tube by using an automatic cooling welding tool for a liquid retarder tube of a hydraulic retarder of the present invention comprises the following steps:

[0071] S1. Fix the flange on the fixed plate 2, pass one end of the liquid buffer tube through the opening on the flange and the pipe port 2a of the fixed plate 2 in sequence, and install the sealing cover 3 on the fixed plate 2 at the same time, turn on the driving motor 30b, and the screw 30a rotates to drive the moving frame 14 to move horizontally. The balance wheel 31 rolls on the outer wall of the liquid buffer tube to detect the position of the liquid buffer tube. After the detection is completed, the driving motor 30b reverses to control the moving frame 14 to reset, and the other end of the liquid buffer tube is blocked with a sealing plug, and the inner cooling water inlet pipe 4 is opened. After the cold water enters the liquid buffer tube, it is discharged from the inner cooling drain pipe 5, and then the welding point between the liquid buffer tube and the flange is welded;

[0072] S2. After welding is completed, the driving motor 30b is turned on again, the moving frame 14 moves horizontally, the balancing wheel 31 rolls on the liquid buffer tube, and the position of the liquid buffer tube is detected again. When the moving frame 14 is close to the weld, the abutment block 11 contacts the lower pressure wheel 12, the cooling box 7 moves downward along the moving groove 14a, and the water-passing piece 8 moves downward. The two water-passing pieces 8 clamp the liquid buffer tube, and the inner wall of the water-passing piece 8 is in close contact with the outer surface of the liquid buffer tube for heat conduction;

[0073] S3, turn on the second cylinder 20, the second cylinder 20 controls the connecting plate 18 to move forward, under the action of the second spring 19, the heat exchange tube 16 extends from the connecting tube 8c, the end of the heat exchange tube 16 contacts the movable plate 21b, the heat exchange tube 16 pushes the scraper 21 to move forward, the scraper 21 fits the outer wall of the liquid buffer tube, and scrapes off the welding slag with weak adhesion, when the scraper 21 moves forward to the welding position, the scraper 21 is contacted, the heat exchange tube 16 continues to move forward, the thrust gradually increases, the heat exchange tube 16 pushes the movable plate 21b open, passes through the pushing hole 21a, the end of the heat exchange tube 16 contacts the weld for heat exchange, and the scraper 21 is reset under the action of the reset spring 21d;

[0074] S4. When the welding slag has strong adhesion and the height of the welding slag is high, the heat exchange tube 16 pushes the scraper 21 and cannot scrape off the welding slag. The heat exchange tube 16 passes through the pushing hole 21a and conflicts with the welding slag. At this time, the second cylinder 20 controls the connecting plate 18 to continue to move forward. The end of the heat exchange tube 16 close to the connecting plate 18 contacts the first pressure sensor 23 and sends an electrical signal. The detection light 24 lights up, and at the same time, the first cylinder 13 starts to move, the conflict block 11 moves backward, and the cooling box 7 continues to move forward under the action of the drive motor 30b and the screw 30a. The pushing force exerted on the scraper 21 reaches the maximum, and the welding slag with strong adhesion on the surface of the liquid buffer tube is scraped off. At this time, the second cylinder 20 controls the heat exchange tube 16 to retract into the connecting tube 8c, and stops cooling the weld. When the cooling box 7 moves to the limit, the welding slag is completely cleaned. At this time, the driving motor 30b controls the cooling box 7 to retreat to the predetermined position, and the first cylinder 13 controls the resistance block 11 to move forward, pressing the cooling box 7 down, and the water-passing part 8 clamps the liquid buffer tube for cooling. At this time, the second cylinder 20 controls the heat exchange tube 16 to extend out of the connecting tube 8c again, and performs contact heat exchange at the weld. It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referred to each other.

[0075] The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by a person skilled in the art in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. An automatic cooling welding tool for a hydraulic retarder's liquid retarder tube, used for cooling the welding of flanges and liquid retarder tubes, characterized by: It includes a workbench, on which a fixing plate is vertically arranged. A number of pipe connection ports are opened on the fixing plate. One side of the fixing plate is provided with a sealing cover plate. An internal cooling water inlet pipe and an internal cooling drain pipe are arranged on the sealing cover. On the side of the fixing plate away from the sealing cover, two cooling mechanisms are arranged in sequence from top to bottom; The cooling mechanism includes a cooling box and a moving frame. A number of water passing parts are arranged on the side of the two cooling boxes close to each other. Cavities are arranged inside the water passing parts. Two abutting blocks are arranged at the upper end and the lower end of the fixing plate. Pressing wheels are arranged at the top of the cooling box located above and the bottom of the cooling box located below. The pressing wheels are rotatably connected to the cooling box. A first cylinder is arranged on the fixing plate, and the moving end of the first cylinder is connected to the abutting block; A driving mechanism for driving the cooling mechanism to move horizontally is also arranged on the workbench; A plurality of connection holes are opened at one end of the water passing part close to the fixing plate and at one end away from the fixing plate. A connection cylinder is arranged inside the water passing part. A heat exchange tube is arranged inside the connection cylinder. The two end faces of the heat exchange tube are closed. A coolant is arranged inside the heat exchange tube. A limiting plate is arranged on the heat exchange tube. A connecting plate is arranged on the cooling box. A second spring is arranged between the connecting plate and the limiting plate. One end of the heat exchange tube away from the fixing plate horizontally penetrates through the connecting plate. A second cylinder is arranged on the cooling box; A scraping plate is arranged at one end of the water passing part close to the fixing plate. A pushing hole is opened on the scraping plate. A movable plate is arranged on the scraping plate. A torsion spring is arranged between the movable plate and the scraping plate. A reset spring is arranged between the scraping plate and the water passing part; Expansion holes are opened at the top and the bottom of the water passing part. An expansion cylinder is vertically arranged inside the cavity of the water passing part. The two ends of the expansion cylinder communicate with the expansion holes. An expansion body is arranged on the inner wall of the moving frame. A through hole is opened on the cooling box. The expansion body passes through the through hole. An expansion cavity is opened inside the expansion body. A telescopic rod is arranged inside the expansion cavity. A reset plate is arranged on the telescopic rod. A third spring is arranged between the reset plate and the inner wall of the expansion cavity. A second pressure sensor is arranged on the inner wall of the expansion cavity. A buzzer alarm is arranged on the cooling box. The buzzer alarm is electrically connected to the second pressure sensor through a circuit; A detection plate is arranged on the side of the connecting plate away from the water passing part. A first pressure sensor is arranged on the side of the detection plate close to the water passing part. A detection lamp is also arranged on the detection plate. The detection lamp is electrically connected to the first pressure sensor through a circuit. When the second spring is in a natural state, there is a set distance between one end of the heat exchange tube close to the detection plate and the detection plate; The moving frame is in an "n" shape, and the openings of the two moving frames are arranged oppositely. Moving grooves are vertically opened on the inner wall of the moving frame. Moving blocks are arranged on both sides of the cooling box and are matched with the moving grooves. A first spring is arranged between the cooling box and the moving frame; The two cooling mechanisms are arranged opposite to each other, and the water-passing piece is semi-cylindrical. The opening of the water-passing piece located at the top faces downward, and the opening of the water-passing piece located at the bottom faces upward. The water-passing piece is also provided with a water inlet pipe and a water outlet pipe. The bottom of the resistance block located at the top is arranged at an inclined surface, and the top of the resistance block located at the bottom is arranged at an inclined surface. The moving end of the first cylinder is in a horizontal direction. When the first spring is in a natural state, there is a set distance between the two cooling boxes. The pushing hole is opposite to the connecting hole, and the two ends of the connecting tube are connected to the connecting hole. The length direction of the heat exchange tube is parallel to the axial direction of the water-passing piece, and the outer wall of the heat exchange tube is in contact with the inner wall of the connecting tube. The vertical section of the connecting plate is semicircular, one end of the second spring is connected to the connecting plate, and the other end is connected to the limit plate. The moving end of the second cylinder is connected to the connecting plate, the scraper is arc-shaped, and the axis of the scraper is coaxial with the axis of the water-passing piece. When the torsion spring is in a natural state, the movable plate covers the pushing hole.

2. According to claim 1, a hydraulic retarder liquid retarder pipe automatic cooling welding tool, characterized in that: The first cylinder is connected to the first pressure sensor via a wireless circuit.

3. According to claim 2, a hydraulic retarder liquid retarder pipe automatic cooling welding tool is characterized in that: The driving mechanism comprises a horizontally arranged screw rod, on which a driving motor is arranged, and on which a threaded piece is arranged on the moving frame, and on which a screw hole matching with the screw rod is arranged.

4. According to claim 3, a hydraulic retarder liquid retarder pipe automatic cooling welding tool is characterized in that: The second pressure sensor is connected to the first cylinder via a wireless circuit.

5. According to claim 4, a hydraulic retarder liquid retarder pipe automatic cooling welding tool is characterized in that: The second pressure sensor is connected to the driving motor via a wireless circuit.

6. According to claim 5, a hydraulic retarder liquid retarder pipe automatic cooling welding tool is characterized in that: A balancing wheel is arranged at one end of the telescopic rod close to the water-passing piece, and the balancing wheel is rotatably connected with the telescopic rod.

7. A method for automatically cooling and welding a hydraulic retarder tube, using the automatic cooling and welding tool for the hydraulic retarder tube according to claim 6, characterized in that: The steps include: S1. Fix the flange on the fixed plate, pass one end of the liquid buffer tube through the opening on the flange and the pipe port of the fixed plate in sequence, and install the sealing cover on the fixed plate at the same time. Turn on the drive motor, rotate the screw, drive the moving frame to move horizontally, and roll the balance wheel on the outer wall of the liquid buffer tube to detect the position of the liquid buffer tube. After the detection is completed, the drive motor is reversed to control the moving frame to reset, and the other end of the liquid buffer tube is blocked with a sealing plug. The inner cooling water inlet pipe is opened, and the cold water enters the liquid buffer tube and then is discharged from the inner cooling drain pipe. Then, the welding point between the liquid buffer tube and the flange is welded; S2. After welding is completed, the driving motor is turned on again, the moving frame moves horizontally, the balance wheel rolls on the liquid buffer tube, and the position of the liquid buffer tube is detected again. When the moving frame is close to the weld, the abutment block contacts the lower pressure wheel, the cooling box moves downward along the moving groove, the water-passing piece moves downward, and the two water-passing pieces clamp the liquid buffer tube. The inner wall of the water-passing piece is in close contact with the outer surface of the liquid buffer tube for heat conduction; S3, turn on the second cylinder, the second cylinder controls the connection plate to move forward, under the action of the second spring, the heat exchange tube extends from the connection tube, the end of the heat exchange tube contacts the movable plate, the heat exchange tube pushes the scraper to move forward, the scraper fits the outer wall of the liquid buffer tube, and scrapes off the welding slag with weak adhesion. When the scraper moves forward to the welding position, the scraper is contacted, the heat exchange tube continues to move forward, the thrust gradually increases, the heat exchange tube pushes the movable plate open, passes through the push holes, the end of the heat exchange tube contacts the weld for heat exchange, and the scraper is reset under the action of the reset spring; S4. When the welding slag has strong adhesion and the height of the welding slag is high, the scraper pushed by the heat exchange tube cannot scrape off the welding slag, and the heat exchange tube passes through the pushing hole and collides with the welding slag. At this time, the second cylinder controls the connecting plate to continue to move forward, and the end of the heat exchange tube close to the connecting plate contacts the first pressure sensor, sends out an electrical signal, and the detection light lights up. At the same time, the first cylinder starts to move, and the resistance block moves backward. The cooling box continues to move forward under the action of the driving motor and the screw. The pushing force on the scraper reaches the maximum, and the welding slag with strong adhesion on the surface of the liquid buffer tube is scraped off. At this time, the second cylinder controls the heat exchange tube to retract into the connecting tube and stop cooling the weld. When the cooling box moves to the limit, the welding slag is completely cleaned. At this time, the driving motor controls the cooling box to retreat to the predetermined position, and the first cylinder controls the resistance block to move forward, presses the cooling box down, and the water-passing piece clamps the liquid buffer tube for cooling. At this time, the second cylinder controls the heat exchange tube to extend out of the connecting tube again to perform heat exchange cooling on the weld.

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