Device for eliminating internal stress of welding rod

Abstract

A device for eliminating internal stress of a welding rod solves the problems that only a single mode is adopted for internal stress elimination at present, internal stress elimination is not thorough, or time and resources are consumed. Comprising a base, a liftable rolling platform, a welding pipe fitting, a vibration internal stress eliminating mechanism and a temperature difference internal stress eliminating mechanism. The vibration internal stress eliminating mechanism comprises a controller and an inner supporting mechanism, and the inner supporting mechanism is fixedly connected with a vibration motor; a pushing mechanism is arranged on the rolling platform, the pushing mechanism is fixedly connected with the inner supporting mechanism, an inductor is arranged on the base, and when the rolling platform falls to the lowest point, the inductor can make contact with a welding pipe fitting; the temperature difference internal stress eliminating mechanism comprises a supporting frame, two distance-adjustable supporting blocks which are symmetrical front and back are arranged on the supporting frame, an angle-adjustable fixing frame is rotationally connected to each supporting block, a heating piece is fixedly connected to each fixing frame, a lengthening rod is fixedly connected to the left side of the supporting frame, and a cooling piece is arranged at the other end of the lengthening rod; internal stress is eliminated through the combined action of vibration and temperature difference, and elimination is more thorough.

Description

Technical Field

[0001] The invention belongs to the technical field of internal stress elimination equipment, and in particular relates to a device for eliminating the internal stress of welding rods. Background Art

[0002] In the field of metal processing, welding, as an important connection technology, is widely used in the manufacture of various structural parts. However, due to local high temperature and rapid cooling during welding, internal stress is often generated in the weld and its surrounding areas. These internal stresses not only affect the strength, toughness and fatigue life of the welded parts, but may also cause deformation, cracking and other failure phenomena during use. Therefore, eliminating welding internal stress is a key step to improve the quality of welded parts and ensure their safe and reliable use. At present, the commonly used welding internal stress elimination methods mainly include natural aging, thermal aging and vibration aging. Natural aging is to eliminate internal stress by placing the welded parts in a natural environment and eliminating internal stress after a long period of natural cooling and relaxation, but this method is time-consuming and the effect is unstable. Thermal aging is to eliminate internal stress by heating the welded parts to a certain temperature, then keeping them warm for a period of time and then slowly cooling them, using the principle of thermal expansion and contraction, but this method has high energy consumption and has certain restrictions on the size and shape of the welded parts.

[0003] Vibration aging is a relatively advanced method for eliminating internal stress. It applies vibrations of a certain frequency and amplitude to the welded parts to make them resonate. Vibration energy is then used to eliminate internal stress. However, existing vibration aging methods still have some problems in practical applications. For example, for the welding of metal workpieces such as circular pipes, it is difficult to achieve stable and reliable fixation and vibration through existing equipment due to the limitations of shape and size, resulting in weakened vibration effects and incomplete elimination of internal stress. In addition, for large or complex welded parts, a single internal stress elimination method often fails to achieve the desired effect. Summary of the invention

[0004] In response to the above technical problems, the present invention provides a device for eliminating internal stress of welding rods, which solves the problem that the internal stress of welding workpieces is currently eliminated by only using vibration aging, which does not eliminate the internal stress thoroughly and uses a full heating method, which is time-consuming and resource-consuming. In addition, for the welding of metal workpieces such as circular pipes, the existing equipment cannot stably and reliably fix and vibrate, resulting in a weakened vibration effect.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions; including a base, a lifting rolling platform, a welding pipe, a vibration internal stress elimination mechanism, and a temperature difference internal stress elimination mechanism;

[0006] The vibration internal stress elimination mechanism includes a controller and an internal support mechanism that can be fixed inside the welding pipe, the internal support mechanism is fixedly connected to a vibration motor, and the vibration motor is electrically connected to a first circuit;

[0007] The rolling platform is provided with a pushing mechanism capable of reciprocating left and right, the height of the pushing mechanism on the rolling platform is adjustable, the moving end of the pushing mechanism is fixedly connected to the inner supporting mechanism, the rolling platform is above the base, a sensor is provided on the base, a first spring is fixedly connected between the sensor and the base, a second circuit is electrically connected to the sensor, the other ends of the first circuit and the second circuit are electrically connected to the controller, and when the rolling platform falls to the lowest point, the sensor can contact the welding pipe fitting;

[0008] The temperature difference internal stress elimination mechanism includes a support frame located above the rolling platform, the support frame is provided with two support blocks with adjustable distance and front-to-back symmetry, each support block is rotatably connected to an angle-adjustable fixed frame, a heating element is fixedly connected to the fixed frame, an extension rod is fixedly connected to the left side of the support frame, and a cooling element is provided at the end of the extension rod away from the support frame.

[0009] Preferably, the internal support mechanism includes a first positioning block and a second positioning block that are fixedly connected, an adjusting screw being rotatably connected between the first positioning block and the second positioning block, a plurality of first connecting rods being hinged on the first positioning block and uniformly distributed in a circle, a plurality of second connecting rods being hinged on the second positioning block and uniformly distributed in a circle, the first connecting rod and the second connecting rod are of equal length and parallel, an end of the first connecting rod away from the first positioning block is hinged to the internal support block, an end of the second connecting rod away from the second positioning block is hinged to the internal support block, the adjusting screw is threadedly connected to the adjusting block, an adjusting rod is hinged on the adjusting block, and an end of the adjusting rod away from the adjusting block is hinged to the first connecting rod or the second connecting rod.

[0010] Preferably, four inner support blocks are evenly distributed around the circumference, and a rubber pad is fixedly connected to the outer surface of each inner support block.

[0011] Preferably, the support frame is rotatably connected to a first lead screw, the first lead screw is threadedly connected to a first slider, the first slider is hinged with two front-to-rear symmetrical third connecting rods, the third connecting rods correspond to the support blocks one-to-one, and one end of the third connecting rod away from the first slider is hinged to the support block. The support frame is in an arc shape, and an arc groove is provided on the support frame for slidingly cooperating with the support block.

[0012] Preferably, the cooling element includes a conduit that can vertically reciprocate, the extension rod is provided with a waterproof cover with adjustable height, the conduit is vertically slidably connected to the waterproof cover, the upper end of the conduit is fixedly connected to a detachable water inlet pipe, the lower end of the conduit is fixedly connected to a knocking block, the side of the knocking block is provided with a plurality of water outlet holes connected to the conduit, and the rolling platform is fixedly connected to a water collector.

[0013] Preferably, a limit block is fixedly connected to the catheter, a second spring is provided between the limit block and the extension rod and is sleeved on the catheter, a motor is fixedly connected to the waterproof cover, a "6"-shaped cam is fixedly connected to the output end of the motor, and the cam is below the limit block and in contact with the limit block.

[0014] Preferably, a fixed column is fixedly connected to the rolling platform, a slide groove is provided on the fixed column, a slider is slidably connected inside the slide groove, the pushing mechanism is fixedly connected to the slider, a third spring is provided between the upper end of the slider and the fixed column, a fourth spring is provided between the lower end of the slider and the fixed column, and the pushing mechanism is an electric push rod.

[0015] Preferably, the rolling platform includes a lifting frame, which is rotatably connected to a first transmission roller group, and two front-to-back symmetrical rotating frames are hinged on the lifting frame. The first transmission roller group is between the two rotating frames, and each rotating frame is rotatably connected to a second transmission roller group.

[0016] Preferably, the heating element comprises a flame tube, each flame tube is connected to an air pipe, and one end of the air pipe away from the flame tube is connected to a fuel tank.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: (i) The present invention can more effectively eliminate the internal stress in the welded pipe fittings through the combined action of the vibration internal stress elimination mechanism and the temperature difference internal stress elimination mechanism. Vibration aging can eliminate part of the internal stress, while temperature difference stretching can further offset the compressive plastic deformation generated during welding, thereby achieving a better effect of eliminating residual stress, and compared with the previous method of heating the entire workpiece, it can save resources; (ii) Strong adaptability: The design of the internal support mechanism enables the present invention to be applicable to welded pipe fittings of different diameters and shapes, such as round pipe fittings and square pipe fittings. The internal support structure cooperates with the pushing mechanism, which can make the welded workpiece move at a uniform and stable speed on the rolling platform, and eliminate the internal stress by cooperating with the temperature difference generated by the heating and cooling parts. In addition, the internal support mechanism and the vibration motor thereon can make the welded pipe fitting vibrate to eliminate the internal stress; (iii) During cooling, the heated weld can further eliminate the internal stress by the continuous knocking of the knocking block; (iv) The push mechanism cooperates with the third spring and the fourth spring, so that when the internal support mechanism fixes the welded pipe fitting, it does not need to be at its center, and the center positioning effect can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 It is the overall structure front view of the present invention.

[0020] Figure 2 It is a three-dimensional diagram of the overall structure of the present invention.

[0021] Figure 3 It is a front view of the overall structure of the inner support mechanism in the present invention.

[0022] Figure 4 It is a three-dimensional diagram of the overall structure of the inner support mechanism in the present invention.

[0023] Figure 5 It is a front view of the overall structure of the temperature difference internal stress elimination mechanism in the present invention.

[0024] Figure 6 It is a left view of the overall structure of the temperature difference internal stress elimination mechanism in the present invention.

[0025] Figure 7 yes Figure 5 A magnified schematic diagram of part A in FIG.

[0026] Figure 8 It is a structural schematic diagram of the position adjustment of two support blocks in the present invention.

[0027] Fig. 9 It is a structural schematic diagram of the cam in the present invention.

[0028] Fig.10 It is a schematic diagram of the structure of the contact between the welding pipe and the sensor when the rolling platform falls to the lowest point in the present invention.

[0029] Fig.11 It is a structural schematic diagram of the connection between the pushing mechanism and the fixed column on the rolling platform in the present invention.

[0030] Fig.12 It is a schematic diagram of a rolling platform when two rotating frames are arranged horizontally in the present invention.

[0031] Fig.13 It is a schematic diagram of the rolling platform when the two rotating frames in the present invention flip upward.

[0032] In the figure: 1-base, 2-rolling platform, 3-welding pipe fittings, 4-controller, 5-vibration motor, 6-first circuit, 7-sensor, 8-first spring, 9-second circuit, 10-support frame, 11-support block, 12-fixed frame, 13-heating element, 14-extension rod, 15-cooling element, 16-first positioning block, 17-second positioning block, 18-adjusting screw, 19-first connecting rod, 20-second connecting rod, 21-inner support block, 22-adjusting block, 23-adjusting rod, 24-rubber pad, 25-first screw, 26-second A slider, 27-the third connecting rod, 28-arc groove, 29-conduit, 30-waterproof cover, 31-water inlet pipe, 32-knocking block, 33-water outlet, 34-limiting block, 35-second spring, 36-motor, 37-cam, 38-fixed column, 39-slide, 40-slider, 41-third spring, 42-fourth spring, 43-electric push rod, 44-lifting frame, 45-first transmission roller group, 46-rotating frame, 47-second transmission roller group, 48-flame tube, 49-air pipe, 50-fuel tank, 51-water collector. DETAILED DESCRIPTION

[0033] The present invention will now be described in further detail with reference to the accompanying drawings. The accompanying drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and thus only show the components related to the present invention.

[0034] Example 1: Reference Figure 1-13 As shown, the present invention comprises a base 1, a lifting rolling platform 2, a welding pipe 3, a vibration internal stress elimination mechanism, and a temperature difference internal stress elimination mechanism;

[0035] The vibration internal stress elimination mechanism includes a controller 4 and an internal support mechanism that can be fixed inside the welding pipe 3, the internal support mechanism is fixedly connected to a vibration motor 5, and the vibration motor 5 is electrically connected to a first circuit 6;

[0036] The rolling platform 2 is provided with a pushing mechanism capable of reciprocating left and right, the height of the pushing mechanism on the rolling platform 2 is adjustable, the moving end of the pushing mechanism is fixedly connected to the inner supporting mechanism, the rolling platform 2 is above the base 1, the base 1 is provided with a sensor 7, a first spring 8 is fixedly connected between the sensor 7 and the base 1, the sensor 7 is electrically connected to a second circuit 9, the other ends of the first circuit 6 and the second circuit 9 are electrically connected to the controller 4, and when the rolling platform 2 falls to the lowest point, the sensor 7 can contact the welding pipe 3;

[0037] The temperature difference internal stress elimination mechanism includes a support frame 10 located above the rolling platform 2, and two support blocks 11 with adjustable distances and front-to-back symmetry are provided on the support frame 10. Each support block 11 is rotatably connected to an angle-adjustable fixed frame 12, and a heating element 13 is fixedly connected to the fixed frame 12. An extension rod 14 is fixedly connected to the left side of the support frame 10, and a cooling element 15 is provided on the end of the extension rod 14 away from the support frame 10.

[0038] The present invention provides a variety of methods for eliminating internal stress in metals, which work together. The specific operations are as follows:

[0039] At present, the most commonly used method for eliminating internal stress in welding workpieces is vibration aging, that is, a vibrator is fixed on the welding workpiece through a fixture (C-frame) to make the welding workpiece and the vibrator resonate. However, the method of eliminating internal stress through vibration can only eliminate about 60% of the internal stress, and the effect is not particularly ideal. In addition, for the welding of metal workpieces such as round pipes, the existing equipment is unstable and the vibration effect is weakened.

[0040] In the present invention, the base 1 serves as a support for the entire device, and the upper portion of the base 1 is a lifting rolling platform 2, which is used to carry and move the welding pipe 3. Its lifting function enables the welding pipe 3 to be processed at different heights. At the same time, the design of the rolling platform facilitates the entry, exit and positioning of the welding pipe 3. The rolling platform 2 can be lifted and lowered by a scissor-type lifting mechanism (the prior art, such as Figure 1 , Figure 2 As shown), the welded pipe fitting 3 is a pipe formed by bending and welding a plate, or a workpiece formed by welding two or more pipe fittings into one.

[0041] Working principle: Place the welding pipe 3 on the rolling platform 2, then, use the pushing mechanism to send the inner support mechanism into the welding pipe and fix it. At this time, the inner support mechanism can position the welding pipe 3. Then, adjust the height of the rolling platform 2 so that the left end of the welding pipe 3 is about 5 cm below the cooling member 15. Then, according to the diameter of the welding pipe 3, adjust the distance between the two support blocks 11 and the angle of the fixing frame 12 so that the angle between the heating member 13 and the longitudinal axis of the welding pipe 3 is thirty degrees, and the weld of the welding pipe 3 is on the central axis of the two heating members 13. The heating areas on both sides of the seam are the same, and then the pushing mechanism is started. The pushing mechanism slowly pulls the welding pipe 3 from left to right. During the movement of the welding pipe 3, the heating element 13 heats the areas on both sides of the weld, and the heated areas are cooled by the cooling element 15 to create a temperature difference field with high temperatures on both sides and low temperatures in the weld area. The thermal expansion of the metal on both sides stretches the weld area with a lower temperature in the middle, causing plastic deformation, that is, the temperature difference formed by local heating is used to stretch the compressive plastic deformation area, thereby generating tensile plastic deformation to offset the compressive plastic deformation generated during welding, thereby achieving the purpose of eliminating residual stress.

[0042] When the rightmost end of the welding pipe 3 is heated and cooled, the rolling platform 2 falls to the lowest point, so that the sensor 7 on the base 1 contacts and cooperates with the welding pipe 3. The function of the first spring 8 is to relieve the downward pressure of the welding pipe 3 when it falls to avoid damage, and to enable the sensor 7 to be more stably fixed on the welding pipe 3, wherein the sensor 7 is an acceleration sensor, including a known type of transducer, and the vibration motor 5 is a prior art and is not repeated here. The vibration motor 5 is fixed to the welding pipe 3 through an internal support mechanism, and its function is to eliminate the residual stress of the welding pipe 3 through vibration. When the external vibration reaches the natural vibration frequency of each part of the welding pipe 3, resonance is generated; the sensor 7 can convert mechanical vibration into an electrical signal, thereby relatively measuring the amplitude of the vibration waveform. The signal is transmitted to the amplifier, and the amplified amount can be controlled by the knob on the controller.

[0043] The parameters for vibration internal stress relief and temperature difference internal stress relief (such as vibration frequency, heating temperature, cooling rate, etc.) should be adjusted according to the material and size of the pipe fittings.

[0044] Embodiment 2: Based on Embodiment 1, Figure 3 , Figure 4As shown, the inner support mechanism includes a first positioning block 16 and a second positioning block 17 that are fixedly connected, an adjusting screw 18 is rotatably connected between the first positioning block 16 and the second positioning block 17, a plurality of first connecting rods 19 that are evenly distributed circumferentially are hinged on the first positioning block 16, a plurality of second connecting rods 20 that are evenly distributed circumferentially are hinged on the second positioning block 17, the first connecting rods 19 and the second connecting rods 20 are equal in length and parallel, the end of the first connecting rod 19 away from the first positioning block 16 is hinged to the inner support block 21, the end of the second connecting rod 20 away from the second positioning block 17 is hinged to the inner support block 21, the adjusting screw 18 is threadedly connected to an adjusting block 22, an adjusting rod 23 is hinged on the adjusting block 22, and the end of the adjusting rod 23 away from the adjusting block 22 is hinged to the first connecting rod 19 or the second connecting rod 20.

[0045] The first positioning block 16 and the second positioning block 17 are fixed to form a stable frame by an extended screw. A certain distance is maintained between the first positioning block 16 and the second positioning block 17 to accommodate the adjusting screw 18 and other connecting rod structures. The adjusting screw 18 is a threaded rod, which passes through the space between the first positioning block 16 and the second positioning block 17 and is rotatably connected to them. The rotation of the adjusting screw 18 can change the position of the adjusting block 22 thereon, thereby adjusting the diameter of the inner support mechanism. The first connecting rod 19 is hinged on the first positioning block 16, and the second connecting rod 20 is hinged on the second positioning block 17. The first connecting rod 19 and the second connecting rod 20 are evenly distributed on the circumference to ensure that the inner support mechanism can be evenly stressed when it is opened. The lengths of the first connecting rod 19 and the second connecting rod 20 are equal and parallel to the inner support block 21 and the frame. A parallelogram mechanism is formed between the inner support blocks 21, which helps to maintain the stability and symmetry of the inner support mechanism. The inner support block 21 is the part of the inner support mechanism that contacts the inside of the welded pipe fitting. Each inner support block 21 is hinged by a pair of first connecting rods 19 and second connecting rods 20 to form a retractable support structure. The adjustment block 22 is threadedly connected to the adjusting screw 18. When the adjusting screw 18 rotates, the adjustment block 22 will move along the adjusting screw 18. When the adjustment block 22 moves, the first connecting rod 19 and the second connecting rod 20 will swing accordingly through the transmission of the adjusting rod 23, thereby changing the distance between the inner support blocks 21, that is, the diameter of the inner support mechanism; when the distance between the inner support blocks 21 is adjusted to an appropriate size, the inner support mechanism can be inserted into the welded pipe fitting and fixed, and the internal stress can be eliminated by transmitting vibration through the vibration motor 5.

[0046] Embodiment 3: Based on Embodiment 2, in order to make the inner support mechanism suitable for square tube welding workpieces, four inner support blocks 21 are evenly distributed around the circumference. In order to ensure that the inner support mechanism can be stably fixed to the welding pipe fitting, a rubber pad 24 is fixedly connected to the outer surface of each inner support block 21.

[0047] Embodiment 4: On the basis of Embodiment 1: the support frame 10 is rotatably connected to a first lead screw 25, the first lead screw 25 is threadedly connected to a first slider 26, the first slider 26 is hinged with two front-to-rear symmetrical third connecting rods 27, the third connecting rods 27 correspond to the support block 11 one-to-one, the end of the third connecting rod 27 away from the first slider 26 is hinged to the support block 11, the support frame 10 is in an arc shape, and the support frame 10 is provided with an arc groove 28 that slides with the support block 11.

[0048] The support frame 10 is in an arc shape and is used to surround the outside of the welding pipe fitting. The support frame 10 is provided with an arc groove 28, and the arc groove 28 is slidably matched with the support block 11 to allow the support block 11 to move in the arc direction. The first lead screw 25 is rotatably connected to the support frame 10, and the first slider 26 is threadedly connected to the first lead screw 25. Therefore, when the first lead screw 25 rotates, the first slider 26 will move along the lead screw. Two front-to-back symmetrical third connecting rods 27 are hinged on the first slider 26. The third connecting rod 27 is used to connect and support the support block 11. When the first slider 26 moves, the support block 11 will slide in the arc groove 28 through the transmission of the third connecting rod 27, thereby changing its position. Each support block 1 1 is rotatably connected to a fixing frame 12 with an adjustable angle for mounting a heating element 13; working principle: when the position of the support block 11 needs to be adjusted to adapt to welding pipe fittings 3 of different sizes, the first lead screw 25 is rotated, and the rotation of the first lead screw 25 drives the first slider 26 to move along the lead screw. The movement of the first slider 26 is driven by the third connecting rod 27 to make the support block 11 slide in the circular arc groove 28. Since the support block 11 is hinged to the third connecting rod 27, the support block can move smoothly in the circular arc direction without being hindered. When the support block 11 is moved to a suitable position, the angle of the fixing frame 12 can be adjusted to ensure that the heating element 13 can be accurately positioned on the pipe fitting.

[0049] Embodiment 5: On the basis of Embodiment 1, the cooling part comprises a conduit 29 capable of vertical reciprocating motion, the extension rod 14 is provided with a waterproof cover 30 with adjustable height, the conduit 29 is vertically slidably connected to the waterproof cover 30, the upper end of the conduit 29 is fixedly connected with a detachable water inlet pipe 31, the lower end of the conduit 29 is fixedly connected with a knocking block 32, the side of the knocking block 32 is provided with a plurality of water outlet holes 33 connected with the conduit 29, and the rolling platform 2 is fixedly connected with a water collector 51.

[0050] The conduit 29 is a component that can move vertically back and forth. It is responsible for transporting cooling water from the top to the knocking block 32 below. The waterproof cover 30 is set on the extension rod 14 to prevent water from splashing after contacting the welding pipe fitting 3. The height of the waterproof cover 30 is adjustable to adapt to welding pipe fittings of different heights. The water inlet pipe 31 is fixedly connected to the upper end of the conduit 29 and is used to inject cooling water into the conduit 29. The knocking block 32 is fixedly connected to the lower end of the conduit 29. When the conduit moves vertically back and forth, the knocking block 32 will knock the welding pipe fitting to enhance the internal stress elimination effect. The side of the knocking block 32 is provided with a plurality of water outlet holes 33 connected to the conduit 29. The cooling water is sprayed onto the pipe fitting through these water outlet holes 33 to achieve cooling. The water collector 51 is fixedly connected to the rolling platform 2 to collect waste water generated during the cooling process.

[0051] Embodiment 6: On the basis of Embodiment 5, in order to realize the vertical reciprocating motion of the knocking block 32, a limit block 34 is fixedly connected to the conduit 29, a second spring 35 which is sleeved on the conduit 29 is fixedly connected between the limit block 34 and the extension rod 14, a motor 36 is fixedly connected to the waterproof cover 30, a "6"-shaped cam 37 is fixedly connected to the output end of the motor 36, and the cam 37 is below the limit block 34 and in contact with the limit block 34.

[0052] The stopper 34 is fixedly connected to the conduit 29. Its function is to limit the second spring 35 and serve as a contact point for the cam 37. The second spring 35 is sleeved on the conduit 29 and is located between the stopper 34 and the extension rod 14 to provide a restoring force so that the conduit 29 can quickly fall after rising under the push of the cam 37. The output end of the motor 36 is fixedly connected to the cam 37 to ensure that the cam can rotate with the rotation of the motor. The cam 37 is designed in a "6" shape, including a distal end and a proximal end, and the distal end and the proximal end are connected by a vertical surface and an arc surface.

[0053] When the motor 36 is started, it drives the cam 37 to rotate. When the cam 37 rotates, it pushes the limit block 34 and the conduit 29 to move upward, that is, it moves from the proximal end to the distal end of the cam 37 through the arc surface. The convex part of the cam 37 contacts the limit block 34 to push the conduit 29 up, and the second spring 35 is stretched. When the contact point falls directly from the distal end to the proximal end of the cam 37 through the vertical surface, under the action of the second spring 35, the knocking block 32 moves downward rapidly to knock the heated weld to further eliminate internal stress. At the same time, cooling water is sprayed out from the water outlet 33, covering the pipe fitting to achieve cooling and form a temperature difference.

[0054] Embodiment 7: On the basis of Embodiment 1, a fixed column 38 is fixedly connected to the rolling platform 2, a slide groove 39 is provided on the fixed column 38, a slider 40 is slidably connected inside the slide groove 39, the pushing mechanism is fixedly connected to the slider 40, a third spring 41 is provided between the upper end of the slider 40 and the fixed column 38, a fourth spring 42 is provided between the lower end of the slider 40 and the fixed column 38, and the pushing mechanism is an electric push rod 43.

[0055] Since the diameters of the welding pipe fittings 3 may be different, when welding pipe fittings 3 of different diameters are placed on the rolling platform 2, the internal support mechanism will not always be on the central axis of the welding pipe fitting 3, and may be biased upward or downward. The problem solved by this embodiment is that the internal support mechanism is not on the central axis of the welding pipe fitting 3, but can still support and fix the welding pipe fitting 3, as long as the internal support mechanism can enter the interior of the welding pipe fitting 3 in a retracted state. When the internal support mechanism enters the interior of the welding pipe fitting 3, the internal support mechanism begins to expand. If the upper internal support block 21 contacts the pipe wall first when expanding, and then, as it continues to expand, the slider 40 will move downward, and the fourth spring 42 will be compressed until the internal support blocks 21 are all in contact with the inner wall of the welding pipe fitting 3 and are fixed. Conversely, when the lower internal support block 21 contacts the pipe wall first, the slider 40 will move upward, and the third spring 41 will be compressed.

[0056] Embodiment 8: On the basis of Embodiment 1, the rolling platform 2 includes a lifting frame 44, to which a first transmission roller group 45 is rotatably connected, and two front-to-rear symmetrical rotating frames 46 are hingedly connected to the lifting frame 44, wherein the first transmission roller group 45 is located between the two rotating frames 46, and each rotating frame 46 is rotatably connected to a second transmission roller group 47.

[0057] The lifting frame 44 is the main structure of the rolling platform 2. It supports the weight of the entire platform and allows the platform to be lifted and lowered. The first transmission roller group 45 is rotatably connected to the lifting frame 44. It is usually composed of multiple parallel transmission rollers and is used to support and transmit workpieces (such as welded pipes). The rotating frame 46 is hinged on the lifting frame 44 and has two front and rear symmetrical frames. The design of the rotating frame 46 allows them to rotate at a certain angle relative to the lifting frame 44, thereby adjusting the position and angle of the second transmission roller group 47. The second transmission roller group 47 is rotatably connected to each rotating frame 46. Similar to the first transmission roller group 45, it is also composed of multiple parallel transmission rollers.

[0058] When it is necessary to adjust the height of the rolling platform 2, the lifting and lowering of the lifting frame 44 will drive the first transmission roller group 45 and the second transmission roller group 47 to move together, thereby changing the height of the workpiece. When it is necessary to adjust the position or angle of the second transmission roller group 47, a cylinder or an electric push rod is hinged between the rotating frame 46 and the lifting frame 44. The rotating frame 46 can be rotated by the electric push rod. The rotation of the rotating frame 46 will drive the second transmission roller group 47 to rotate together, thereby changing its position and angle relative to the first transmission roller group 45. The workpiece can be accurately positioned on the platform, which is convenient for the internal support mechanism to accurately penetrate into the pipe and maintain its position during vibration.

[0059] Embodiment 9: Based on the embodiment 1, the heating element comprises a flame tube 48 , each flame tube 48 is connected to a gas pipe 49 , and one end of the gas pipe 49 away from the flame tube 48 is connected to a fuel tank 50 .

[0060] When it is necessary to heat the workpiece, first ensure that the fuel tank 50 is filled with fuel (oxygen-acetylene or oxygen-propane gas can be used), and open the fuel supply valve (not mentioned in the description, usually located between the fuel tank 50 and the gas pipe 49), the fuel is transported to the burner in the flame tube 48 through the gas pipe 49, and ignites after mixing with air in the burner to generate flame. The flame tube 48 directs the flame to the workpiece to be heated, and transfers heat to the workpiece through the thermal radiation and convection of the flame, thereby achieving the purpose of heating. During the heating process, the size and temperature of the flame can be controlled by adjusting the fuel supply and the air flow of the burner to meet different heating requirements.

[0061] In addition, for circular welding workpieces, electromagnetic induction heating can also be used. Electromagnetic induction heating is an efficient method for heating metals. Its principle is to use a magnetic field to generate eddy currents in the metal workpiece, thereby generating heat. When the metal welding workpiece is placed in the coil and passed through, the magnetic flux lines penetrate the metal workpiece to form a current closed loop. Due to the small resistance of the metal and the high current, the electrons collide and rub against each other inside the metal to generate heat energy, causing the metal itself to heat up quickly.

[0062] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A device for eliminating internal stress of welding rods, comprising a base (1), a lifting and lowering rolling platform (2), a welding pipe (3), a vibration internal stress elimination mechanism, and a temperature difference internal stress elimination mechanism; characterized in that: The vibration internal stress elimination mechanism comprises a controller (4) and an internal support mechanism that can be fixed inside the welding pipe (3), the internal support mechanism is fixedly connected to a vibration motor (5), and the vibration motor (5) is electrically connected to a first circuit (6); The rolling platform (2) is provided with a pushing mechanism capable of reciprocating left and right, the height of the pushing mechanism on the rolling platform (2) is adjustable, the moving end of the pushing mechanism is fixedly connected to the inner supporting mechanism, the rolling platform (2) is above the base (1), the base (1) is provided with a sensor (7), a first spring (8) is fixedly connected between the sensor (7) and the base (1), the sensor (7) is electrically connected to a second circuit (9), the other ends of the first circuit (6) and the second circuit (9) are electrically connected to the controller (4), and when the rolling platform (2) falls to the lowest point, the sensor (7) can contact the welding pipe (3); The temperature difference internal stress elimination mechanism comprises a support frame (10) located above the rolling platform (2), the support frame (10) is provided with two support blocks (11) with adjustable distance and front-to-back symmetry, each support block (11) is rotatably connected to an angle-adjustable fixed frame (12), a heating element (13) is fixedly connected to the fixed frame (12), an extension rod (14) is fixedly connected to the left side of the support frame (10), and a cooling element (15) is provided at one end of the extension rod (14) away from the support frame (10).

2. A device for eliminating internal stress of welding rod according to claim 1, characterized in that: The inner support mechanism comprises a first positioning block (16) and a second positioning block (17) which are fixedly connected. An adjusting screw (18) is rotatably connected between the first positioning block (16) and the second positioning block (17). A plurality of first connecting rods (19) which are evenly distributed in a circumference are hinged on the first positioning block (16). A plurality of second connecting rods (20) which are evenly distributed in a circumference are hinged on the second positioning block (17). The first connecting rods (19) and the second connecting rods (20) are equal in length and parallel. An end of the first connecting rod (19) which is away from the first positioning block (16) is hinged on the inner support block (21). An end of the second connecting rod (20) which is away from the second positioning block (17) is hinged on the inner support block (21). The adjusting screw (18) is threadedly connected to an adjusting block (22). An adjusting rod (23) is hinged on the adjusting block (22). An end of the adjusting rod (23) which is away from the adjusting block (22) is hinged on the first connecting rod (19) or the second connecting rod (20).

3. A device for eliminating internal stress of welding rod according to claim 2, characterized in that: Four inner support blocks (21) are evenly distributed around the circumference, and a rubber pad (24) is fixedly connected to the outer surface of each inner support block (21).

4. A device for eliminating internal stress of welding rod according to claim 1, characterized in that: The support frame (10) is rotatably connected to a first lead screw (25), the first lead screw (25) is threadedly connected to a first slider (26), the first slider (26) is hinged with two front-to-rear symmetrical third connecting rods (27), the third connecting rods (27) correspond to the support block (11) one by one, one end of the third connecting rod (27) away from the first slider (26) is hinged to the support block (11), the support frame (10) is in an arc shape, and the support frame (10) is provided with an arc groove (28) that slidably cooperates with the support block (11).

5. The device for eliminating internal stress of welding rod according to claim 1, characterized in that: The cooling element comprises a conduit (29) capable of vertical reciprocating movement, the extension rod (14) is provided with a waterproof cover (30) with adjustable height, the conduit (29) is vertically slidably connected to the waterproof cover (30), the upper end of the conduit (29) is fixedly connected to a detachable water inlet pipe (31), the lower end of the conduit (29) is fixedly connected to a knocking block (32), the side of the knocking block (32) is provided with a plurality of water outlet holes (33) in communication with the conduit (29), and the rolling platform (2) is fixedly connected to a water collector (51).

6. A device for eliminating internal stress of welding rod according to claim 5, characterized in that: A limit block (34) is fixedly connected to the conduit (29); a second spring (35) sleeved on the conduit (29) is provided between the limit block (34) and the extension rod (14); a motor (36) is fixedly connected to the waterproof cover (30); a "6"-shaped cam (37) is fixedly connected to the output end of the motor (36); the cam (37) is located below the limit block (34) and in contact with the limit block (34).

7. A device for eliminating internal stress of welding rod according to claim 1, characterized in that: The rolling platform (2) is fixedly connected with a fixed column (38), the fixed column (38) is provided with a slide groove (39), the interior of the slide groove (39) is slidably connected with a slider (40), the pushing mechanism is fixedly connected with the slider (40), a third spring (41) is provided between the upper end of the slider (40) and the fixed column (38), a fourth spring (42) is provided between the lower end of the slider (40) and the fixed column (38), and the pushing mechanism is an electric push rod (43).

8. The device for eliminating internal stress of welding rod according to claim 1, characterized in that: The rolling platform (2) comprises a lifting frame (44), a first transmission roller group (45) being rotatably connected to the lifting frame (44), two front-to-back symmetrical rotating frames (46) being hingedly connected to the lifting frame (44), the first transmission roller group (45) being located between the two rotating frames (46), and each rotating frame (46) being rotatably connected to a second transmission roller group (47).

9. A device for eliminating internal stress of welding rod according to claim 1, characterized in that: The heating element comprises a flame tube (48), each flame tube (48) is connected to a gas pipe (49), and one end of the gas pipe (49) away from the flame tube (48) is connected to a fuel tank (50).

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