Multi-degree-of-freedom welding auxiliary teaching device

Abstract

The utility model discloses a multi-degree-of-freedom welding auxiliary teaching device, which comprises the following structures: a base, a stand column arranged on the base, a lifting lead screw arranged on the stand column, and a lifting motor connected with the lifting lead screw; a nut cylinder is arranged in the lifting sleeve, and the interior of the nut cylinder is connected with a lifting lead screw through a lead screw nut; the rotary sleeve is arranged outside the lifting sleeve in a sleeving manner and is connected with the lifting sleeve through a rotary connecting structure; one end of the cross arm is rotatably connected with the rotary sleeve through a connecting seat, and the chuck is centered; the device can lift, horizontally rotate and vertically rotate, a workpiece is positioned through the centering chuck, the spatial position of the workpiece can be adjusted in a multi-degree-of-freedom manner, various welding operations such as flat welding, vertical welding, overhead welding, angle welding, horizontal welding and pipe seam welding are met for teaching demonstration and training practical operation practice, the practical training work efficiency is higher, and the practical training effect is better. And the operation safety is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of welding, in particular to a multi-degree-of-freedom welding auxiliary teaching device. Background Art

[0002] In the training and teaching process of welding technology, it is necessary to conduct practical teaching on operations such as flat welding, vertical welding, overhead welding, fillet welding, horizontal welding, and pipe seam welding. However, the current related training and teaching can only be done by directly placing the plates on the ground for welding, or making some simple fixtures to fix the plates or pipes and then weld them. However, these methods are less operational and the training and teaching effects are also poor. Utility Model Content

[0003] In order to solve the deficiencies in the prior art, the utility model provides a multi-degree-of-freedom welding auxiliary teaching device, which can be equipped with lifting, horizontal rotation and vertical rotation. The workpiece can be positioned by a centering chuck, and the spatial position of the workpiece can be adjusted with multiple degrees of freedom to meet the teaching demonstration and training practical exercises of various welding operations such as flat welding, vertical welding, overhead welding, corner welding, horizontal welding, pipe seam welding, etc., so the practical training work efficiency is higher and the operation safety is higher.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The utility model provides a multi-degree-of-freedom welding auxiliary teaching device, comprising the following structure:

[0006] A base, wherein a column is arranged on the base, a lifting screw is vertically arranged on the column, and one end of the lifting screw is connected to a lifting motor;

[0007] A lifting sleeve, wherein the lifting sleeve is sleeved outside the column, the inner wall of the lifting sleeve is provided with a nut barrel, the inner hole of the nut barrel is provided with a lead screw nut and is connected with the lifting lead screw through the lead screw nut;

[0008] A rotating sleeve, the rotating sleeve is sleeved outside the lifting sleeve and is rotatably connected to the lifting sleeve through a rotating connection structure;

[0009] A cross arm, one end of which is connected to a rotating sleeve via a connecting seat, the cross arm and the connecting seat are rotatably connected, a terminal is provided on the cross arm, the terminal is connected to an insulating channel, a wire is provided in the insulating channel, one end of the wire is connected to the terminal, and the other end extends out of the insulating channel and is connected to an electric welding clamp;

[0010] A centering chuck is arranged at an end of the cross arm away from the connecting seat.

[0011] The device of the utility model can firstly drive the lifting screw to rotate through the lifting motor, and the lifting screw drives the lifting sleeve through the screw nut and the nut sleeve to realize the lifting of the workpiece, and can also realize the adjustment of the horizontal position of the workpiece by the rotation of the rotating sleeve on the lifting sleeve, and can also realize the adjustment of the vertical angle of the workpiece by the rotation of the cross arm on the connecting seat. The workpiece can be clamped and fixed by the centering chuck. During actual operation, the terminal is used to connect the negative pole of the electric welding machine, and the electric welding clamp clamps the workpiece on the centering chuck, which is more convenient to operate. The setting of the insulating channel ensures the safety during the operation. The clamped workpiece can be a flat piece or a pipe piece, which realizes teaching and practical learning of multiple welding methods and multiple angles, and the teaching effect is better.

[0012] The device of the utility model can be equipped with lifting, horizontal rotation and vertical rotation. The workpiece can be positioned by a centering chuck, and the spatial position of the workpiece can be adjusted with multiple degrees of freedom to meet the teaching demonstration and training practice of various welding operations such as flat welding, vertical welding, overhead welding, fillet welding, horizontal welding, pipe seam welding, etc., so the practical training work efficiency is higher and the operation safety is higher.

[0013] In a further technical solution, a guide column is vertically arranged on the column, and a guide cylinder is also arranged on the inner wall of the lifting sleeve, and the lifting sleeve is slidably connected to the guide column via the guide cylinder.

[0014] The arrangement of the guide column and the guide cylinder can play a guiding role in the lifting and lowering of the lifting sleeve, making the lifting and lowering process smoother and reducing the lateral pressure on the lead screw.

[0015] In a further technical solution, a groove for accommodating the lifting screw, the nut cylinder, the guide column and the guide cylinder is opened on the outer wall of the column.

[0016] A groove is arranged on the outer wall of the column, and the lifting screw and the guide column are embedded in the groove, so that the structure between the column and the lifting sleeve is more compact and the volume of the device is reduced.

[0017] In a further technical solution, the rotating connection structure includes a positioning hole, which is arranged around the outer wall of the lifting sleeve. A positioning threaded hole is opened on the rotating sleeve and a positioning knob is connected through the positioning threaded hole. The size of the positioning knob matches the positioning hole.

[0018] After the rotating sleeve rotates around the lifting sleeve, the positioning knob is turned, and the positioning knob extends into the positioning hole to realize the circumferential positioning of the rotating sleeve, thereby preventing the workpiece from swinging during welding.

[0019] In a further technical solution, the rotary connection structure further comprises an annular groove formed on the outer peripheral wall of the lifting sleeve, and a convex ring is provided on the inner peripheral wall of the rotating sleeve, and the shape and size of the convex ring match the annular groove.

[0020] The setting of the convex ring can play a load-bearing role, so that the positioning knob does not need to bear weight, has a longer service life, and the rotation process is smoother.

[0021] In a further technical solution, semicircular grooves are respectively provided on opposite surfaces of the convex ring and the annular groove, and balls are arranged in the semicircular grooves.

[0022] The setting of the ball changes the sliding friction between the rotating sleeve and the lifting sleeve into rolling friction, making the rotation easier and the operation more labor-saving, while further improving the stability of the rotation process.

[0023] In a further technical solution, a pre-welding platform is also provided on the base, and an electric welding clamp, an insulating channel and a terminal are also provided on the pre-welding platform.

[0024] By setting up a pre-welding platform, two workpieces to be welded can be pre-welded on the pre-welding platform to connect them, and then the connected whole is moved to the centering chuck for fixation, and then the complete welding is performed, without the need for other fixing devices, thus reducing the device structure.

[0025] In a further technical solution, the centering chuck includes two sliders slidably connected to the circular surface of the centering chuck, and clamping plates are arranged on the opposite surfaces of the two sliders, and arc surfaces are formed on the opposite surfaces of the two clamping plates.

[0026] The clamp has both curved and flat surfaces, so that the clamp can clamp both flat pieces and pipes, and has the teaching function of welding materials of various shapes.

[0027] In a further technical solution, an insulating pad layer is also provided on the opposite surfaces of the two clamping plates.

[0028] The provision of an insulating cushion layer further improves the safety of welding operations, and the device itself will not be over-electrical.

[0029] The beneficial effects are:

[0030] 1. The device of the utility model can be lifted, rotated horizontally and vertically. The workpiece can be positioned by a centering chuck, and the spatial position of the workpiece can be adjusted with multiple degrees of freedom to meet the needs of teaching demonstrations and training exercises for various welding operations such as flat welding, vertical welding, overhead welding, fillet welding, horizontal welding, and pipe seam welding. The training work efficiency is higher and the operation safety is higher.

[0031] 2. The setting of the guide column and the guide cylinder can guide the lifting and lowering of the lifting sleeve, making the lifting process smoother and reducing the lateral pressure on the lead screw.

[0032] 3. A groove is arranged on the outer wall of the column, and the lifting screw and the guide column are embedded in the groove, so that the structure between the column and the lifting sleeve is more compact and the volume of the device is reduced.

[0033] 4. After the rotating sleeve rotates around the lifting sleeve, turn the positioning knob, and the positioning knob extends into the positioning hole to realize the circumferential positioning of the rotating sleeve to avoid the workpiece from swinging during welding.

[0034] 5. The setting of the convex ring can play a load-bearing role, so that the positioning knob does not need to bear weight, the service life is longer, and the rotation process is smoother.

[0035] 6. The setting of the ball changes the sliding friction between the rotating sleeve and the lifting sleeve into rolling friction, making the rotation easier and the operation more labor-saving, while further improving the stability of the rotation process.

[0036] 7. By setting up a pre-welding platform, two workpieces to be welded can be pre-welded on the pre-welding platform to connect them, and then the connected whole is moved to the centering chuck for fixation, and then the complete welding is performed, without the need for other fixing devices, thus reducing the device structure.

[0037] 8. The clamp has both curved and flat surfaces, so that the clamp can clamp both flat parts and pipe fittings, and has the teaching function of welding materials of various shapes.

[0038] 9. The setting of the insulating cushion layer further improves the safety of welding operations, and the device itself will not be over-electrical. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic diagram of the overall structure of the multi-degree-of-freedom welding auxiliary teaching device of the embodiment of the utility model;

[0040] Figure 2 It is a schematic diagram of the connection structure between the lifting sleeve and the column of the multi-degree-of-freedom welding auxiliary teaching device of the embodiment of the utility model;

[0041] Figure 3 It is a schematic diagram of the rotary connection structure of the rotary sleeve of the multi-degree-of-freedom welding auxiliary teaching device according to an embodiment of the utility model;

[0042] Figure 4 It is a structural schematic diagram of a rotating sleeve of a multi-degree-of-freedom welding auxiliary teaching device according to an embodiment of the utility model;

[0043] Figure 5 It is a structural schematic diagram of a centering chuck of a multi-degree-of-freedom welding auxiliary teaching device according to an embodiment of the utility model;

[0044] Figure 6The utility model discloses a control circuit diagram of a lifting motor of a multi-degree-of-freedom welding auxiliary teaching device according to an embodiment of the utility model.

[0045] Figure numerals: 10, base; 11, pre-welding platform; 20, column; 21, lifting motor; 22, lifting screw; 23, lifting sleeve; 231, guide cylinder; 232, nut cylinder; 233, positioning hole; 234, ring groove; 24, guide column; 30, rotating sleeve; 31, positioning knob; 32, convex ring; 40, connecting seat; 50, cross arm; 60, centering chuck; 61, slider; 62, splint; 63, insulating pad; 70, welding clamp; 71, wire; 72, insulating channel; 73, terminal. DETAILED DESCRIPTION

[0046] The utility model is further described below in conjunction with the accompanying drawings:

[0047] Example:

[0048] A multi-degree-of-freedom welding auxiliary teaching device, such as Figure 1 As shown, it includes the following structures:

[0049] A base 10, on which a column 20 is disposed, on which a lifting screw 22 is vertically disposed, and one end of the lifting screw 22 is connected to a lifting motor 21;

[0050] In this embodiment, the column 20 is fixedly connected to the base, and the two ends of the lifting screw 22 are rotatably connected to the end faces of the two ends of the column 20 through bearings. The lifting motor 21 is fixedly installed above the end face of the top of the column 20 and its output end is connected to one end of the lifting screw 22 extending from the end face of the top of the column 20 through a coupling.

[0051] Lifting sleeve 23, such as Figure 2 As shown, the lifting sleeve 23 is sleeved on the outside of the column 20, and a nut tube 232 is provided on the inner wall of the lifting sleeve 23. A lead screw nut is provided in the inner hole of the nut tube 232 and is connected to the lifting screw 22 through the lead screw nut; the lead screw nut and the nut tube 232 are fixedly connected.

[0052] Rotating sleeve 30, such as Figure 3 As shown, the rotating sleeve 30 is sleeved outside the lifting sleeve 23 and is rotatably connected to the lifting sleeve 23 through a rotating connection structure;

[0053] Cross arm 50, such as Figure 1As shown, one end of the cross arm 50 is connected to the rotating sleeve 30 through the connecting seat 40, and the cross arm 50 is rotatably connected to the connecting seat 40. A terminal 73 is provided on the cross arm 50, and the terminal 73 is connected to an insulating channel 72. A wire 71 is provided in the insulating channel 72. One end of the wire 71 is connected to the terminal 73, and the other end extends out of the insulating channel 72 and is connected to the electric welding clamp 70;

[0054] The connecting seat 40 is fixedly connected to the rotating sleeve 30, the terminal 73 is fixed to the cross arm 50 by means of mounting screws, and the insulating channel 72 is a groove provided on the cross arm 50, and the groove is coated with insulating material.

[0055] The centering chuck 60 is arranged at one end of the cross arm 50 away from the connecting seat 40 .

[0056] The centering chuck 60 and the cross arm 50 are fixedly connected.

[0057] The device of the utility model can firstly drive the lifting screw 22 to rotate through the lifting motor 21, and the lifting screw 22 drives the lifting sleeve 23 through the screw nut and the nut sleeve to realize the lifting of the workpiece. The horizontal position of the workpiece can be adjusted by rotating the rotating sleeve 30 on the lifting sleeve 23, and the vertical angle of the workpiece can be adjusted by rotating the cross arm 50 on the connecting seat 40. The workpiece can be clamped and fixed by the centering chuck 60. During actual operation, the terminal 73 is used to connect the negative pole of the electric welding machine. The electric welding clamp 70 clamps the workpiece on the centering chuck 60, which is more convenient to operate. The setting of the insulating channel 72 ensures the safety during the operation. The clamped workpiece can be a flat piece or a pipe piece, which can realize teaching and practical learning of multiple welding methods and multiple angles, and the teaching effect is better.

[0058] In this embodiment, lifting and lowering are achieved by a lifting motor 21, and the adjustment of the two angles is adjusted by manual operation. This is to reduce the size of the equipment, reduce the cost of the device, and reduce the dead weight of the movable end.

[0059] It is understandable that in other embodiments, other action parts can also be implemented using automated equipment such as electric or pneumatic equipment.

[0060] The device of the utility model has a large adjustment range and high adjustment efficiency, and thus has the advantage of high working efficiency.

[0061] In this embodiment, since the negative pole of the welding machine is connected to the workpiece through the terminal, the wire and the welding clamp, and the wire is buried in the insulating channel, the device itself will not be over-electrified, thereby ensuring the safety of the training and teaching process.

[0062] The device of the utility model can be equipped with lifting, horizontal rotation and vertical rotation. The workpiece can be positioned by a centering chuck, and the spatial position of the workpiece can be adjusted with multiple degrees of freedom to meet the teaching demonstration and training practice of various welding operations such as flat welding, vertical welding, overhead welding, fillet welding, horizontal welding, pipe seam welding, etc., so the practical training work efficiency is higher and the operation safety is higher.

[0063] In another embodiment, if Figure 2 As shown, a guide column 24 is vertically arranged on the column 20 , and a guide cylinder 231 is also arranged on the inner wall of the lifting sleeve 23 . The lifting sleeve 23 is slidably connected to the guide column 24 via the guide cylinder 231 .

[0064] The guide column 24 is fixedly connected to the end surfaces of both ends of the column 20 , and the guide cylinder 231 is fixedly connected to the lifting sleeve 23 .

[0065] The arrangement of the guide column 24 and the guide cylinder 231 can guide the lifting and lowering of the lifting sleeve 23 , making the lifting and lowering process smoother and reducing the lateral pressure on the lifting screw 22 .

[0066] In another embodiment, if Figure 2 As shown, three groups of guide posts 24 are provided, and the three groups of guide posts 24 and one group of lifting screw rods 22 are arranged at equal angles around the column 20. Such an arrangement provides optimal stability.

[0067] In another embodiment, if Figure 2 As shown, a groove for accommodating the lifting screw 22, the nut cylinder 232, the guide column 24 and the guide cylinder 231 is formed on the outer wall of the column 20.

[0068] A groove is provided on the outer wall of the column 20, and the lifting screw 22 and the guide column 24 are both embedded in the groove, so that the structure between the column 20 and the lifting sleeve 23 is more compact, and the volume of the device is reduced.

[0069] In another embodiment, if Figure 3 and Figure 4 As shown, the rotating connection structure includes a positioning hole 233, which is arranged around the outer wall of the lifting sleeve 23. A positioning threaded hole is opened on the rotating sleeve 30 and a positioning knob 31 is connected through the positioning threaded hole. The size of the positioning knob 31 matches the positioning hole 233.

[0070] After the rotating sleeve 30 rotates around the lifting sleeve 23, the positioning knob 31 is turned, and the positioning knob 31 extends into the positioning hole 233 to achieve circumferential positioning of the rotating sleeve 30, thereby preventing the workpiece from swinging during welding.

[0071] In this embodiment, if Figure 3As shown, the rotation structure between the cross arm 50 and the connecting seat 40 is the same as the rotation connection structure between the rotating sleeve 30 and the lifting sleeve 23. One end of the cross arm 50 is inserted into the connecting seat 40. The end of the cross arm 50 is cylindrical, and positioning holes 233 are arranged around its outer wall. A positioning knob 31 is passed through the connecting seat 40, and its principle is the same as that of the rotation connection structure.

[0072] In another embodiment, if Figure 3 As shown, the rotary connection structure also includes an annular groove 234 formed on the outer peripheral wall of the lifting sleeve 23 , and a convex ring 32 is provided on the inner peripheral wall of the rotating sleeve 30 , and the shape and size of the convex ring 32 match the annular groove 234 .

[0073] The protruding ring 32 is fixedly connected to the rotating sleeve 30 .

[0074] The provision of the convex ring 32 can play a load-bearing role, so that the positioning knob 31 does not need to bear weight, has a longer service life, and the rotation process is smoother.

[0075] It can be understood that the presence of the convex ring 32 requires the installation of the rotating sleeve 30 to be divided into two steps, that is, the rotating sleeve 30 itself is divided into two for installation, or the lifting sleeve 23 is divided into two for installation at the annular groove 234. There are many structural forms and corresponding installation forms, and technicians in this field can freely choose according to the design direction, which will not be elaborated here.

[0076] In another embodiment, if Figure 3 As shown, semicircular grooves are respectively formed on the opposite surfaces of the convex ring 32 and the annular groove 234, and balls are arranged in the semicircular grooves.

[0077] The provision of the balls converts the sliding friction between the rotating sleeve 30 and the lifting sleeve 23 into rolling friction, making the rotation easier and the operation more labor-saving, while further improving the stability of the rotation process.

[0078] In another embodiment, if Figure 1 As shown, a pre-welding platform 11 is also provided on the base 10 , and an electric welding clamp 70 , an insulating channel 72 and a terminal 73 are also provided on the pre-welding platform 11 .

[0079] By setting up the pre-welding platform 11, two workpieces to be welded can be pre-welded on the pre-welding platform 11 to connect them, and then the connected whole is moved to the centering chuck 60 for fixation, and then the complete welding is performed, without the need for other fixing devices, thus reducing the device structure.

[0080] In another embodiment, if Figure 5As shown, the centering chuck 60 includes two sliders 61 slidably connected to the circular surface of the centering chuck 60 , and clamping plates 62 are provided on the opposite surfaces of the two sliders 61 , and arc surfaces are provided on the opposite surfaces of the two clamping plates 62 .

[0081] The overlock 62 is mounted on the slider 61 by screws.

[0082] The clamping plate 62 has both an arc surface and a flat surface, so that the clamping plate 62 can clamp both flat pieces and pipes, and has the teaching function of welding materials of various shapes.

[0083] It can be understood that the centering chuck 60 is a mature component and can be purchased directly. In this embodiment, a 2-jaw electric centering chuck is used. The motor of the centering chuck can be hidden in the cross arm or inside the centering chuck. The centering chuck itself is conventional technology, and its working principle and internal structure will not be repeated here.

[0084] In another embodiment, if Figure 5 As shown, an insulating pad layer 63 is also provided on the opposite surfaces of the two clamping plates 62 .

[0085] The provision of the insulating pad layer 63 further improves the safety during the welding operation, and the device itself will not be over-electrical.

[0086] In another embodiment, if Figure 6 As shown, the control of the lifting motor includes the lifting motor M1, relay CJ1, relay CJ2, stop button SB1, forward button SB2, reverse button SB3, transistors and resistors, among which: the coil of relay CJ1 is CJ1.1, its normally open contact is CJ1.2, and its normally closed contact is CJ1.3; the coil of relay CJ2 is CJ2.1, its normally open contact is CJ2.2, and its normally closed contact is CJ2.3.

[0087] One end of the stop button SB1 is connected to the positive electrode of the power supply VCC, and the other end of the stop button SB1 is connected in parallel to one end of the normally closed contact CJ2.3 of the relay CJ2 and then connected to one end of the normally closed contact CJ1.3 of the relay CJ1. The other end of the normally closed contact CJ2.3 of the relay CJ2 is connected in series with the normally open contact CJ1.2 of the relay CJ1, the coil CJ1.1 of the relay CJ1 and the resistor R1, and then connected to the base of the NPN transistor Q1. The other end of the normally closed contact CJ1.3 of the relay CJ1 is connected in series with the normally open contact CJ2.2 of the relay CJ2, the coil CJ2.1 of the relay CJ2 and the resistor R2, and then connected to the base of the NPN transistor Q2. The forward button SB2 is connected in parallel to both ends of the normally open contact CJ1.2 of the above-mentioned relay CJ1, and the reverse button SB3 is connected in parallel to both ends of the normally open contact CJ2.2 of the above-mentioned relay CJ2.

[0088] The collector of NPN transistor Q1 is connected in series with resistor R3 and then connected to the base of PNP transistor Q3, the emitter of NPN transistor Q1 is connected to the base of NPN transistor Q6, the collector of NPN transistor Q2 is connected in series with resistor R4 and then connected to the base of PNP transistor Q5, the emitter of NPN transistor Q2 is connected to the base of NPN transistor Q4. The emitter of PNP transistor Q3 is connected in parallel with the emitter of PNP transistor Q5 and then connected to the positive pole of power supply VCC, the collector of PNP transistor Q3 is connected to the collector of NPN transistor Q4, the collector of PNP transistor Q5 is connected to the collector of NPN transistor Q6, the emitter of NPN transistor Q4 is connected in parallel with the emitter of NPN transistor Q6 and then grounded.

[0089] One end of the lifting motor M1 is connected to the connection line between the collector of the above-mentioned PNP transistor Q3 and the collector of the NPN transistor Q4, and the other end of the lifting motor M1 is connected to the connection line between the collector of the above-mentioned PNP transistor Q5 and the collector of the NPN transistor Q6.

[0090] NPN transistor Q1, NPN transistor Q2, NPN transistor Q4 and NPN transistor Q6 all adopt 8050 transistors; PNP transistor Q3 and PNP transistor Q5 all adopt 8550 transistors.

[0091] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A multi-degree-of-freedom welding auxiliary teaching device, characterized in that: Includes the following structures: A base, wherein a column is arranged on the base, a lifting screw is vertically arranged on the column, and one end of the lifting screw is connected to a lifting motor; A lifting sleeve, wherein the lifting sleeve is sleeved outside the column, the inner wall of the lifting sleeve is provided with a nut barrel, the inner hole of the nut barrel is provided with a lead screw nut and is connected with the lifting lead screw through the lead screw nut; A rotating sleeve, the rotating sleeve is sleeved outside the lifting sleeve and is rotatably connected to the lifting sleeve through a rotating connection structure; A cross arm, one end of which is connected to a rotating sleeve via a connecting seat, the cross arm and the connecting seat are rotatably connected, a terminal is provided on the cross arm, the terminal is connected to an insulating channel, a wire is provided in the insulating channel, one end of the wire is connected to the terminal, and the other end extends out of the insulating channel and is connected to an electric welding clamp; A centering chuck is arranged at an end of the cross arm away from the connecting seat.

2. The multi-degree-of-freedom welding auxiliary teaching device according to claim 1, characterized in that: A guide column is also vertically arranged on the column, and a guide cylinder is also arranged on the inner wall of the lifting sleeve. The lifting sleeve is slidably connected to the guide column via the guide cylinder.

3. The multi-degree-of-freedom welding auxiliary teaching device according to claim 2, characterized in that: The outer wall of the column is provided with a groove for accommodating the lifting screw, the nut cylinder, the guide column and the guide cylinder.

4. The multi-degree-of-freedom welding auxiliary teaching device according to claim 1, characterized in that: The rotary connection structure comprises a positioning hole, which is arranged around the outer peripheral wall of the lifting sleeve. A positioning threaded hole is opened on the rotary sleeve and a positioning knob is connected through the positioning threaded hole. The size of the positioning knob matches the positioning hole.

5. The multi-degree-of-freedom welding auxiliary teaching device according to claim 4, characterized in that: The rotary connection structure also includes an annular groove formed on the outer peripheral wall of the lifting sleeve, and a convex ring is provided on the inner peripheral wall of the rotating sleeve, and the shape and size of the convex ring match the annular groove.

6. The multi-degree-of-freedom welding auxiliary teaching device according to claim 5, characterized in that: Semicircular grooves are respectively formed on opposite surfaces of the convex ring and the annular groove, and balls are arranged in the semicircular grooves.

7. The multi-degree-of-freedom welding auxiliary teaching device according to claim 1, characterized in that: A pre-welding platform is also provided on the base, and an electric welding clamp, an insulating channel and a terminal are also provided on the pre-welding platform.

8. The multi-degree-of-freedom welding auxiliary teaching device according to claim 1, characterized in that: The centering chuck comprises two sliding blocks slidably connected to the circular surface of the centering chuck, clamping plates are arranged on the opposite surfaces of the two sliding blocks, and arc surfaces are formed on the opposite surfaces of the two clamping plates.

9. The multi-degree-of-freedom welding auxiliary teaching device according to claim 8, characterized in that: Insulating pads are also arranged on the opposite surfaces of the two clamping plates.

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