Automatic butt-welding machine for hot end of thermocouple wire

Abstract

The invention relates to the field of welding equipment, in particular to a thermocouple wire hot end automatic butt-welding machine which is characterized in that two wire discs are arranged at one end of a table body, a wire gathering pipe extending in the length direction of the table body is arranged in the middle of the table body, and two strands of wires are released through the two wire discs and penetrate through the wire gathering pipe; a translation mechanism sliding in the length direction of the table body is arranged on the table body on the side, away from the wire disc, of the wire gathering pipe, and a welding head used for welding the free ends of the two strands of wires is fixedly installed on the translation mechanism; the translation mechanism is further provided with a wire drawing clamp used for clamping two strands of wires, the table body is provided with a lifting mechanism, and the lifting mechanism is provided with scissors used for cutting off the two strands of wires between the wire drawing clamp and the wire gathering pipe. The ends of the two strands of silk threads in the splayed shape are attached through axial movement of the silk gathering pipe, and butt welding is conducted on the ends of the two strands of silk threads through movement of the carbon rod.

Description

Technical Field

[0001] The invention relates to the field of welding equipment, in particular to an automatic hot end welding machine for thermocouple wires. Background Art

[0002] With the rising price of precious metals platinum and rhodium, in order to control the cost of rapid thermocouples, the wire diameter of platinum and rhodium wire is generally 0.1-0.028mm, so the requirements for platinum and rhodium wire welding technology are getting higher and higher. At present, there are two common welding methods for the hot end welding of thermocouple wires for molten steel temperature detection at home and abroad: one is to cross-press and weld (or spot weld) two wires into a joint; the other is to butt-weld two wires into a spherical temperature package; although the cross welding method has a simpler welding process, the cross weld is not as strong as other welding methods (such as butt welding spherical temperature packages), and the quality of the weld may be affected by the operating technology. The size of the cross weld is difficult to control accurately, which may affect the temperature measurement accuracy and reliability of the thermocouple. The weld of the butt-welded spherical temperature package is usually firmer, can withstand greater mechanical stress and temperature changes, and the weld is uniform, which is conducive to improving the temperature measurement accuracy and reliability of the thermocouple.

[0003] Although the spherical temperature package for butt welding has many advantages, the current method of rapid welding of thermocouple wires has always been to manually clamp the two wires with tweezers and send them to the electrode carbon rod of the welding machine power supply for butt welding to form a temperature package, and then cut them into the required length for standby use. The production efficiency is low and cannot meet the needs of modern production, and needs to be improved. Summary of the invention

[0004] The object of the present invention is to provide an automatic hot end welding machine for thermocouple wires, which can automatically complete the welding and cutting of the wires, so as to solve the defects mentioned in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] The automatic hot end welding machine for thermocouple wires comprises a long strip-shaped platform, one end of which is provided with two wire reels, the middle part of which is provided with a wire gathering tube extending along the length direction of the platform, two strands of wire are respectively released from the two wire reels and pass through the wire gathering tube, a translation mechanism sliding along the length direction of the platform is provided on the platform located on the side of the wire gathering tube away from the wire reel, a welding head for welding the free ends of the two strands of wire is fixedly installed on the translation mechanism; a wire drawing clamp for clamping the two strands of wire is also installed on the translation mechanism, a lifting mechanism is provided on the platform, and a scissors for cutting the two strands of wire between the wire drawing clamp and the wire gathering tube are installed on the lifting mechanism.

[0007] As a further improvement, a wire pressing cylinder is installed on the platform, and a pressing plate for pressing the two strands of wire between the wire gathering tube and the wire reel is installed on the piston rod of the wire pressing cylinder.

[0008] As a further improvement, a wire guide tube is fixedly installed on the platform, and the two strands of the wire pass through the wire guide tube, the bottom of the pressing plate and the wire gathering tube in sequence.

[0009] As a further improvement, the wire gathering tube is driven by a control mechanism and moves along its axial direction; during welding, the control mechanism drives the wire gathering tube to move toward the welding head to shorten the dimension of the free end of the wire passing through the outside of the wire gathering tube.

[0010] As a further improvement, the wire gathering tube is a quartz tube.

[0011] As a further improvement, a visual inspection mechanism for inspecting the welding points of the two strands of the silk threads is provided above the translation mechanism, and a wire grabbing claw for clamping the two strands of the silk threads cut by the scissors is also installed on the lifting mechanism. When the lifting mechanism rises, the wire grabbing claw clamps the two strands of the silk threads and sends the two strands of the silk threads to the visual inspection mechanism.

[0012] As a further improvement, the welding head is a carbon rod.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The ends of the two figure-eight wire strands are fitted together by the axial movement of the wire gathering tube, and the ends of the two wire strands are butt-welded by moving the carbon rod. After the butt-welding is completed, the wire is pulled out to a certain size by the wire drawing clamp, and the butt-welded wire is cut by scissors. Finally, the two butt-welded wire strands are sent to the detection camera by the wire grabbing claw for analysis and judgment of the welding points. The welding process does not require manual operation and has a high degree of mechanization, thereby improving the welding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 is a schematic structural diagram of an embodiment of the present invention;

[0017] Figure 2 is a stereogram of an embodiment of the present invention;

[0018] Figure 3 is a schematic structural diagram of a translation mechanism and a lifting mechanism of an embodiment of the present invention;

[0019] Figure 4 is a schematic structural diagram of an installation box according to an embodiment of the present invention;

[0020] Figure 5 This is a schematic diagram of butt welding two strands of silk thread.

[0021] In the figure: 1- platform; 2- wire reel; 3- wire gathering tube; 4- wire; 5- electric guide rail; 6- electric slide; 7- carbon rod; 8- wire drawing clamp; 9- slide bar; 10- crossbeam; 11- mounting plate; 12- scissors; 13- mounting box; 14- wire pressing cylinder; 15- pressing plate; 16- supporting platform; 17- wire guide tube; 18- guide sleeve; 19- translation cylinder; 20- adjusting plate; 21- detection camera; 22- wire grabbing claw; 23- lifting cylinder. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] like Figures 1 to 5 As shown, the thermocouple wire hot end automatic welding machine comprises a platform 1, and the platform 1 is in the shape of a long strip extending laterally.

[0024] The left end of the platform 1 is fixed with two wire reel racks arranged in parallel front and back by bolts, and the two wire reels are rotatably mounted on the two wire reels. The middle part of the platform 1 is provided with a wire gathering tube 3 extending transversely along the length direction of the platform 1. The two strands of wire 4 are released from the two wire reels 2 and pass through the wire gathering tube 3 to the right. The wire gathering tube 3 plays the role of gathering the two strands of wire 4 together, so as to facilitate the subsequent butt welding of the free ends of the two strands of wire 4.

[0025] like Figure 2 and Figure 3 As shown, a translation mechanism that slides laterally along the length direction of the platform 1 is provided on the platform 1 located on the right side of the wire gathering tube 3. The translation mechanism includes a laterally extending electric guide rail 5 installed on the top of the platform 1, and an electric slide 6 is slidably installed on the top of the electric guide rail 5. A welding head for welding the free ends of the two strands of wire 4 is fixedly installed on the electric slide through a bracket. The welding head is specifically a laterally extending carbon rod 7, and the carbon rod 7 is connected to the negative electrode of the welding machine.

[0026] The electric slide 6 is also bolted with a wire drawing clamp 8 for clamping the two strands of wire 4 at the right end of the wire gathering tube 3. The wire drawing clamp 8 is located on the side of the carbon rod 7 close to the wire gathering tube 3. The specific position of the wire drawing clamp 8 can be an electric clamp. The platform body 1 is provided with a lifting mechanism, which is located above one end of the electric guide rail 5 close to the wire gathering tube 3. The lifting mechanism includes two slide bars 9 arranged front and back relative to each other. The slide bars 9 extend vertically. The lower ends of the slide bars 9 are fixedly mounted on the platform body 1. A crossbeam 10 is fixedly mounted on the upper ends of the two slide bars 9 by bolts. A mounting plate 11 is slidably mounted on the two slide bars 9 located below the crossbeam 10. A lifting cylinder 23 with a piston rod extending downward is bolted to the top of the crossbeam 10. The mounting plate 11 is bolted to the piston rod of the lifting cylinder 23. A scissors 12 for cutting the two strands of wire 4 extending from the right end of the wire gathering tube 3 and between the wire drawing clamp 8 and the wire gathering tube 3 are bolted to the bottom of the mounting plate 11. The scissors 12 can be electric scissors.

[0027] like Figure 2 and Figure 4 As shown, a mounting box 13 is fixedly installed on the platform 1 between the wire gathering tube 3 and the two wire reels 2 by bolts, and two strands of wire 4 pass through the mounting box 13. A wire pressing cylinder 14 is installed on the top of the mounting box 13 by bolts. The piston rod of the wire pressing cylinder 14 extends downward into the mounting box 13 and is fixedly installed with a pressing plate 15 for pressing the two strands of wire 4 between the wire gathering tube 3 and the wire reel 2. A support platform 16 is provided on the inner side of the bottom wall of the mounting box 13 directly below the pressing plate 15. When the wire pressing cylinder 14 extends, it drives the pressing plate 15 to move downward, and the two strands of wire 4 are pressed tightly against the top of the support platform 16 by the pressing plate 15. The pressing plate 15 is a metal pressing plate, and when welding, it is connected to the positive electrode of the welding machine.

[0028] A wire guide tube 17 is fixedly installed on the platform 1 between the installation box 13 and the two wire reels 2 by bolts, and the two strands of wire 4 pass through the wire guide tube 17, the bottom of the pressing plate 15 and the wire gathering tube 3 in sequence. The wire guide tube 17 is coaxially arranged with the wire gathering tube 3. By arranging the wire guide tube 17, the wire 4 between the wire guide tube 17 and the wire gathering tube 3 is made straighter, so that the pressing plate 15 can stably press the wire 4.

[0029] The left wall of the installation box 13 is provided with a through hole for the wire 4 to enter. The wire gathering tube 3 is driven by the control mechanism and moves along its axial direction. A guide sleeve 18 matching the wire gathering tube 3 is fixedly installed on the right wall of the installation box 13 by bolts. The wire gathering tube 3 is slidably sleeved in the guide sleeve 18. The control mechanism includes a translation cylinder 19 installed in the installation box 13 by bolts. The piston rod of the translation cylinder 19 passes through the outside of the installation box 13 to the right and is fixedly installed with an adjustment plate 20 by bolts. The wire gathering tube 3 is clamped on the adjustment plate 20.

[0030] When welding, the pressing plate 15 is connected to the positive pole of the welding machine, and at the same time, the pressing plate 15 is driven by the wire pressing cylinder 14 to press the two strands of wire 4 to be butt-welded tightly on the top of the support platform 16 to prevent the two strands of wire from moving when the wire gathering tube 3 moves left and right; the translation cylinder 19 is extended to drive the wire gathering tube 3 to move rightward in the direction close to the carbon rod 7, so that the free end of the wire 4 passing through the right end of the wire gathering tube 3 is shortened, so that the ends of the two strands of wire 4 in the shape of an eight at the mouth of the wire gathering tube 3 fit together, and at the same time, a certain length of wire 4 is left at the right end of the wire gathering tube 3 to wait for the carbon rod 7 to be butt-welded; Figure 5 As shown, the electric slide 6 drives the wire drawing clamp 8 and the carbon rod 7 connected to the negative pole of the welding machine to move to the left. Initially, the distance between the two jaws of the wire drawing clamp 8 is greater than the diameter of the wire gathering tube 3. When the wire drawing clamp 8 and the carbon rod 7 move to the left, the wire drawing clamp 8 passes over the right end of the wire gathering tube 3 to the left and the free ends of the two wires 4 touch the carbon rod 7 to complete the butt welding.

[0031] After the butt welding is completed, the power supply of the welding machine is cut off, the translation cylinder 19 contracts and drives the wire gathering tube 3 to move to the left and return to its original position, and at the same time, the wire pressing cylinder 14 contracts and drives the pressing plate 15 to release the wire 4; then the two jaws of the wire drawing clamp 8 close and clamp the two strands of wire 4 after the butt welding is completed at the right end of the wire gathering tube 3, and the electric slide 6 drives the wire drawing clamp 8 and the carbon rod 7 to move to the right together, and the wire drawing clamp 8 pulls the wire 4 to the right to a certain size, so as to cut the two strands of wire 4 that have been spray-welded to a fixed length; finally, the lifting cylinder 23 extends and drives the mounting plate 11 to descend, and the mounting plate 11 drives the scissors 12 to descend to the height of the wire 4, and the scissors 12 cut the wire 4 that has been butt-welded at the right end of the wire gathering tube 3.

[0032] In this embodiment, the wire gathering tube 3 is a quartz tube, which has high temperature resistance and is transparent and smooth, thereby reducing the resistance of the wire moving in the wire gathering tube 3 .

[0033] A visual inspection mechanism for inspecting the welding points of the two strands of wire 4 is provided above the translation mechanism. The visual inspection mechanism specifically includes an inspection camera 21. The inspection camera 21 is located on the right side of the lifting mechanism. The inspection camera 21 is connected to the controller and is fixedly mounted on the platform 1 through a gantry. A wire grabbing claw 22 for clamping the two strands of wire 4 cut by the scissors 12 is also installed on the lifting mechanism. The wire grabbing claw 22 is located on the side of the scissors 12 away from the wire gathering tube 3. The wire grabbing claw 22 can also be an electric clamp. When the mounting plate 11 descends, the scissors 12 and the wire grabbing claw 22 are driven to descend synchronously until the scissors 12 and the wire grabbing claw 22 descend to the height of the wire 4. First, the two wires 4 located between the wire gathering tube 3 and the wire drawing clamp 8 are clamped by the wire grabbing claw 22, and then the wire 4 that has been butt-welded is cut from the right end of the wire gathering tube 3 by the scissors 12. Finally, the wire drawing clamp 8 releases the wire 4, and the lifting cylinder 23 is extended to drive the mounting plate 11 to rise and fall. The mounting plate 11 drives the scissors 12 and the wire grabbing claw 22 to rise synchronously. The wire grabbing claw 22 clamps the two wires 4 that have been butt-welded and sends the wire 4 to the detection camera 21. The detection camera 21 analyzes the welding points of the two wires 4 to determine whether they are qualified.

[0034] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. Thermocouple wire hot end automatic welding machine, characterized by: It comprises a long strip-shaped platform, one end of which is provided with two wire reels, a wire gathering tube extending along the length direction of the platform is provided in the middle of the platform, two strands of wire are respectively released through the two wire reels and pass through the wire gathering tube, a translation mechanism which slides along the length direction of the platform is provided on the platform at the side of the wire gathering tube away from the wire reels, a welding head for welding the free ends of the two strands of wire is fixedly mounted on the translation mechanism; a wire drawing clamp for clamping the two strands of wire is also mounted on the translation mechanism, a lifting mechanism is provided on the platform, and a scissors for cutting the two strands of wire between the wire drawing clamp and the wire gathering tube are mounted on the lifting mechanism.

2. The thermocouple wire hot end automatic welding machine according to claim 1, characterized in that: A wire pressing cylinder is installed on the platform, and a pressing plate for pressing the two strands of the wire between the wire collecting tube and the wire reel is installed on the piston rod of the wire pressing cylinder.

3. The thermocouple wire hot end automatic welding machine as claimed in claim 3, characterized in that: A wire guide tube is fixedly installed on the platform, and the two strands of the wires pass through the wire guide tube, the bottom of the pressing plate and the wire gathering tube in sequence.

4. The thermocouple wire hot end automatic welding machine according to claim 1, characterized in that: The wire gathering tube is driven by a control mechanism and moves along its axial direction; during welding, the control mechanism drives the wire gathering tube to move toward the welding head, so that the free end of the wire passing through the outside of the wire gathering tube is shortened.

5. The thermocouple wire hot end automatic welding machine according to claim 1, characterized in that: The wire gathering tube is a quartz tube.

6. The thermocouple wire hot end automatic welding machine according to claim 1, characterized in that: A visual inspection mechanism for inspecting the welding points of the two strands of the silk threads is provided above the translation mechanism, and a wire grabbing claw for clamping the two strands of the silk threads cut by the scissors is also installed on the lifting mechanism. When the lifting mechanism rises, the wire grabbing claw clamps the two strands of the silk threads and sends the two strands of the silk threads to the visual inspection mechanism.

7. The thermocouple wire hot end automatic welding machine according to claim 1, characterized in that: The welding head is a carbon rod.

Images