Precise welding device for small weldment

Abstract

The invention relates to the technical field of weldment welding, and discloses a small weldment precision welding device which comprises a welding base, a welding gun, a gradient preheating module, a preheating adaptive module and a heat energy conversion module, the welding base and the welding gun are used for welding small weldments, the gradient preheating module and the preheating adaptive module are matched to achieve temperature gradient preheating before welding, and the welding gun is used for welding the small weldments. The heat energy conversion module collects and stores welding heat energy in the welding process of the weldment and is used for next preheating of the gradient preheating module; a gradually-changed gradient preheating module is arranged on a weldment, and gradually-changed spiral airflow channels are arranged from the center, close to a welding area, of the weldment to the ends of the two sides before welding according to the welding center line of a welding seam, so that the preheating module can form three sections of transfer cavities with different temperatures, and the temperature of a core area, the temperature of a transition area and the temperature of an edge area are set from high to low; welding temperature difference stress is reduced, and welding perforation or deformation of small weldments is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of weldment welding, and more particularly to a small weldment precision welding device. Background Art

[0002] At present, manual welding or carbon dioxide gas shielded welding is used for the welding of some small workpieces, and some welds often need to be rotated to be completely welded. Precision welding equipment is used in the design of tiny, high-precision metal parts. Its core function is to achieve reliable connection of welds by precisely controlling energy input and positioning systems.

[0003] When welding small weldments, due to their thin thickness and fast heat dissipation, the melting depth exceeds the thickness of the workpiece, and the molten metal flows out from the back of the weld, forming a perforation defect. The burn-through completely destroys the weld, causing the joint to lose its connection and bearing capacity; and the uneven heat input is easy to cause the weldment to warp and deform, affecting the dimensional accuracy; Secondly, the high heat generated during the welding operation is directly discharged into the welding environment without being treated. The ambient temperature fluctuation can easily lead to an increase in the temperature difference between the weldment and the weld, increasing the risk of subsequent deformation and cracking. In addition, the high-temperature heat energy output in a close clamping range during welding can easily cause high-temperature expansion and deformation of the clamp. The clamping position and angle will change, and the weldment cannot be effectively fixed, resulting in positional offset or inaccurate angle of the weldment. The welding surface of the weldment will also be uneven, and the contact between the welding gun and the weldment will be uneven, resulting in inconsistent weld width, affecting the quality and accuracy of welding small welds. Summary of the invention

[0004] The present invention provides a small-sized precision welding device for weldments, which solves the technical problems in the related art of lack of preheating of weldments before welding, which causes deformation and perforation, and the high-temperature heat energy generated by welding, which affects the welding precision.

[0005] The present invention provides a small-sized weldment precision welding device, comprising: Welding base and welding gun for welding small weldments; Gradient preheating module, preheating adapter module and heat energy conversion module. The cooperation of the weldment with the gradient preheating module and the preheating adapter module realizes temperature gradual preheating before welding. The heat energy conversion module collects and stores welding heat energy during the welding process of the weldment and uses it for the next preheating of the gradient preheating module. The gradient preheating module is provided with two groups of arc covers and a pair of heat insulation rings are fixedly connected inside the arc covers, and the inner wall of the arc covers is divided from the middle to the two sides into three heat energy transfer cavities: a core area, a transition area and an edge area.

[0006] As a further solution of the present invention: the gradient preheating module includes: Two groups of symmetrically arranged rectangular frames, the middle parts of which are rotatably connected with threaded rods, the top ends of the threaded rods penetrate the rectangular frames and are fixedly connected with a turntable, the outer walls of the threaded rods are threadedly connected with connecting strips, the opposite ends of the connecting strips are fixedly connected with arc covers, the inner walls of the transfer cavities in the core area, transition area and edge area of ​​the arc cover are surrounded by a plurality of guide strips, the number and inclination angles of the guide strips are respectively arranged from less to more and from large to small from the edge area to the core area, and a plurality of air holes are opened in the middle of the insulation ring.

[0007] As a further solution of the present invention: the preheating adaptation module includes: The electric clamp arranged on the top of the welding base is rotatable, and a welding gun is fixedly installed at the top center position of the welding base, a stepper motor is fixedly connected to the middle of the outer wall of the welding base, and a bidirectional lead screw is fixedly connected to the driving end of the stepper motor, and pulleys are fixedly connected to the end of the bidirectional lead screw away from the stepper motor and the middle of the electric clamp, and the pulleys on both sides are connected by connecting belts, and a bevel gear 1 is fixedly connected to the middle of the outer wall of the bidirectional lead screw.

[0008] As a further solution of the present invention: the middle part of the welding base is rotatably connected with a bevel gear 2, the bevel gear 2 is meshed and connected with the bevel gear 1, and the top of the bevel gear 2 is fixedly connected with a transmission gear.

[0009] As a further solution of the present invention: guide grooves are symmetrically opened on both sides of the top of the welding base, the inner walls of the guide grooves on both sides are slidably connected with support blocks, the tops of the support blocks on both sides are fixedly connected with connecting tooth plates, and the connecting tooth plates on both sides are meshed and connected with the transmission gears.

[0010] As a further solution of the present invention: the tops of the engaging tooth plates on both sides are fixedly connected with electromagnetic induction coils, and the opposite sides of the electromagnetic induction coils on both sides are fixedly connected with baffles.

[0011] As a further solution of the present invention: the thermal energy conversion module comprises: A suction hood, wherein a fan is fixedly installed on the inner wall of the suction hood, a three-way hose is fixedly provided inside the suction hood and penetrates therethrough, and both sides of the top of the arc-shaped hood on both sides are fixedly connected with an insulation box, and the two ends of the three-way hose away from the suction hood respectively penetrate and extend to the interior of the insulation boxes on both sides.

[0012] As a further solution of the present invention: the interior of the insulation boxes on both sides are fixedly connected with connecting hoses, the outer walls of the connecting hoses on both sides are fixedly connected with one-way valves, and the bottom ends of the connecting hoses on both sides respectively extend through the edge area cavities of the arc covers on both sides.

[0013] As a further solution of the present invention: lower clamping blocks are threadedly connected to both sides of the outer wall of the bidirectional lead screw, upper clamping blocks are hingedly provided on the top of the lower clamping blocks on both sides, and a plurality of spring ball parts are provided around the inner walls of the lower clamping blocks and the upper clamping blocks.

[0014] As a further solution of the present invention: deformation compensation grooves are provided in the middle of the side surfaces of the lower clamping block and the upper clamping block on both sides, and the deformation compensation grooves adopt a honeycomb support structure, which reduces the flatness error at high temperature.

[0015] The beneficial effects of the present invention are: The present invention sets a gradual gradient preheating module for the weldment, and sets a gradual spiral airflow channel from the center of the weld area to the two side ends of the weldment before welding, with reference to the welding center line of the weld, so that the preheating module can form three transfer cavities (core area, transition area and edge area) with different temperatures, and sets a flow path from small to large in the cavity from the core area to the edge area. When the path is small, the flow rate is increased to increase the friction heat effect and promote the temperature rise. When the path is large, the flow rate is reduced to reduce friction heat, so that the temperature of the core area, transition area and edge area is set from high to low, thereby reducing the welding temperature difference stress and avoiding welding perforation or deformation of small weldments.

[0016] The present invention sets a spiral heating track for weld seam areas of welds of different sizes during the preheating process, sets a rotation adjustment for the weld, and adjusts the rotation speed and power to ensure that the heat input per unit area stably matches the weld seam areas of welds of different sizes.

[0017] The present invention absorbs the heat energy output by the welding gun to the weldment during the welding process and collects it by the heat preservation box. When the weldment is preheated next time, the absorbed and stored heat energy can be transmitted to the gradient preheating module for use to preheat the weldment, thereby realizing the cyclic replacement utilization of welding heat energy and being more energy-saving and environmentally friendly.

[0018] During the welding process, the temperature influence on the clamping position of the weldment clamp is different depending on how close it is to the welding area. To avoid the influence of high temperature, the present invention provides deformation compensation grooves on the upper and lower clamps on both sides and adopts a honeycomb support structure to minimize the flatness error of the clamp at high temperature, absorb thermal expansion deformation, and ensure the stability of the weldment clamping. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall three-dimensional structure of a small-sized weldment precision welding device proposed by the present invention; Figure 2 The invention provides a small-sized weldment precision welding device. Figure 1 The enlarged schematic diagram of A in the middle; Figure 3It is a rear view schematic diagram of the overall three-dimensional structure of a small-sized weldment precision welding device proposed by the present invention; Figure 4 It is a vertical cross-sectional schematic diagram of the arc-shaped covers on both sides of the upper part of a small-sized weldment precision welding device proposed by the present invention; Figure 5 It is a partial side view schematic diagram of the internal structure of the arc cover of a small-sized weldment precision welding device proposed by the present invention; Figure 6 The invention provides a small-sized weldment precision welding device. Figure 5 The enlarged schematic diagram of point B in the middle; Figure 7 It is a side view schematic diagram of the overall three-dimensional structure of a small-sized weldment precision welding device proposed by the present invention; Figure 8 The invention provides a small-sized weldment precision welding device. Figure 7 The enlarged schematic diagram of the center C; Fig. 9 It is a schematic diagram of a clamped and unwelded state of a small-sized weldment precision welding device proposed by the present invention.

[0020] In the figure: 1. welding base; 2. welding gun; 3. stepping motor; 4. bidirectional lead screw; 5. lower clamping block; 6. upper clamping block; 7. spring ball; The gradient preheating module 8 includes: 801, rectangular frame; 802, threaded rod; 803, turntable; 804, connecting strips; 805, arc cover; 806, heat insulation ring; 807, air hole; 808, guide strip.

[0021] The preheating adaptation module 9 includes: 901, electric gripper; 902, pulley; 903, connecting belt; 904, bevel gear one; 905, bevel gear two; 906, transmission gear; 907, connecting gear plate; 908, support block; 909, guide groove; 910, electromagnetic induction coil; 911, baffle.

[0022] The heat energy conversion module 10 comprises: 1001. Suction hood; 1002. Fan; 1003. Three-way hose; 1004. Insulation box; 1005. Connecting hose; 1006. One-way valve.

[0023] 11. Deformation compensation groove. DETAILED DESCRIPTION

[0024] The subject matter described herein will now be discussed with reference to example implementations. It should be understood that the discussion of these implementations is only to enable those skilled in the art to better understand and implement the subject matter described herein, and the functions and arrangements of the elements discussed may be changed without departing from the scope of protection of the contents of this specification. Various examples may omit, replace, or add various processes or components as needed, and in addition, the features described in some examples may also be combined in other examples.

[0025] Embodiment 1 like Figure 1 - Figure 7 As shown, a small-sized weldment precision welding device comprises: The welding base 1 and the welding gun 2 are used for welding small weldments; Gradient preheating module 8, preheating adapter module 9 and heat energy conversion module 10, the weldment cooperates with the gradient preheating module 8 and the preheating adapter module 9 to realize the temperature gradual preheating before welding, and the heat energy conversion module 10 collects and stores the welding heat energy during the welding process of the weldment and uses it for the next preheating of the gradient preheating module 8; The gradient preheating module 8 is provided with two sets of arc covers 805, and a pair of heat insulation rings 806 are fixedly connected inside the arc covers 805, and the inner wall of the arc covers 805 is divided from the middle to the two sides into three heat energy transfer cavities of the core area, the transition area and the edge area; Specifically: the welding end of the welding gun 2 is aligned with the center of the welding base 1 to ensure that it can be aligned with the center of the weld of the weldment. The material of the arc cover 805 is a ceramic-based composite material, and the distance between the heat energy transfer cavities in the core area, transition area and edge area is unified.

[0026] The gradient preheating module 8 includes: Two groups of rectangular frames 801 are symmetrically arranged, the middle of the rectangular frames 801 are rotatably connected with threaded rods 802, the top of the threaded rods 802 penetrates the rectangular frames 801 and is fixedly connected with a turntable 803, the outer walls of the threaded rods 802 are threadedly connected with connecting strips 804, and the opposite ends of the connecting strips 804 are fixedly connected with arc covers 805, and the inner walls of the core area, transition area and edge area transfer cavity in the arc cover 805 are surrounded by a plurality of guide strips 808, and the number and inclination angle of the guide strips 808 are respectively arranged from the edge area to the core area, and from large to small, and a plurality of air holes 807 are opened in the middle of the heat insulation ring 806; Specifically, after the weldment is placed, the turntables 803 on both sides are rotated respectively to drive the threaded rods 802 on both sides to rotate inside the rectangular frame 801, so that the connecting strips 804 drive the arc covers 805 on both sides to move in the vertical direction, and match and attach according to the outer wall size of the weldment. In the previous welding step, the welding heat energy is collected and stored, and then transported to the edge area cavity in the arc cover 805 during preheating. After being spirally transported by each guide strip 808, it flows into the transition area cavity through each air hole 807 in the middle of the insulation ring 806. The number and inclination angle of the guide strips 808 are set from less to more and larger to smaller from the edge area to the core area, respectively, so that the friction force of the thermal energy airflow during the flow process changes from small to large from the end to the center, and then the temperature changes accordingly, so that the temperature of the three sections of the arc cover 805 changes from the end to the center.

[0027] Embodiment 2 like Figure 1-Figure 2 , Figure 4 and Fig. 9 As shown, based on the first embodiment, the present application defines the preheating adjustment method of small weldments of different sizes, and the preheating adaptation module 9 includes: The electric clamp 901 arranged on the top of the welding base 1 is rotated, a welding gun 2 is fixedly installed at the top center of the welding base 1, a stepper motor 3 is fixedly connected to the middle of the outer wall of the welding base 1, a bidirectional lead screw 4 is fixedly connected to the driving end of the stepper motor 3, and a pulley 902 is fixedly connected to the middle of the electric clamp 901 at one end of the bidirectional lead screw 4 away from the stepper motor 3, and the pulleys 902 on both sides are connected by a connecting belt 903; Specifically, when the stepper motor 3 drives the bidirectional screw 4 to rotate to adjust the spacing of the positioning mechanism, the electric clamp 901 can be driven to rotate through the pulleys 902 on both sides and the connecting belt 903. The electric clamp 901 clamps the small welded workpiece and rotates synchronously at the same time, and a rotating structure is set to drive the weldment to rotate.

[0028] A bevel gear 904 is fixedly connected to the middle of the outer wall of the bidirectional lead screw 4, and a bevel gear 905 is rotatably connected to the middle of the welding base 1. The bevel gear 905 is meshed with the bevel gear 904, and a transmission gear 906 is fixedly connected to the top of the bevel gear 905. Guide grooves 909 are symmetrically provided on both sides of the top of the welding base 1, and support blocks 908 are slidably connected to the inner walls of the guide grooves 909 on both sides. The tops of the support blocks 908 on both sides are fixedly connected with connecting tooth plates 907, and the connecting tooth plates 907 on both sides are meshed with the transmission gear 906. The tops of the connecting tooth plates 907 on both sides are fixedly connected with electromagnetic induction coils 910, and baffles 911 are fixedly connected to the opposite sides of the electromagnetic induction coils 910 on both sides. Specifically, bevel gear 1 904 rotates synchronously with the rotation of the bidirectional lead screw 4, and drives the transmission gear 906 to rotate with the meshing bevel gear 2 905, and the support block 908 receives the fixedly connected connecting tooth plate 907 and the electromagnetic induction coil 910, so that the transmission gear 906 can drive the connecting tooth plates 907 on both sides to move closer or farther during the rotation, thereby ensuring the stability of the adjustment process, and driving the electromagnetic induction coils 910 on both sides to move along the welding areas on both sides of the weld of the weldment, and cooperate with the electromagnetic induction coils 910 to form a spiral heating trajectory, and ensure that the heat input per unit area is stably matched to weldments of different sizes by adjusting the rotation speed and power, and reciprocating directional heating is performed around the 5-10 cm area on both sides of the weld, and the range of the heat affected zone is accurately controlled, and the synchronously moving baffle 911 is cooperated to isolate the non-preheating area, reduce the energy loss caused by heat diffusion, and ensure uniform and stable heat input.

[0029] Embodiment 3 like Figure 1 , Figure 3-Figure 5 and Fig. 9 As shown, based on the second embodiment, the present application defines the way of recycling the heat output during the welding process, and the heat energy conversion module 10 includes: Suction hood 1001, a fan 1002 is fixedly installed on the inner wall of the suction hood 1001, a three-way hose 1003 is fixedly installed inside the suction hood 1001, and both sides of the top of the arc-shaped hoods 805 on both sides are fixedly connected with insulation boxes 1004, and the two ends of the three-way hose 1003 away from the suction hood 1001 extend through the inside of the insulation boxes 1004 on both sides, and the inside of the insulation boxes 1004 on both sides are fixedly connected with connecting hoses 1005, and the outer walls of the connecting hoses 1005 on both sides are fixedly connected with one-way valves 1006, and the bottom ends of the connecting hoses 1005 on both sides extend through the edge area cavities of the arc-shaped hoods 805 on both sides; Specifically, the suction hood 1001 is arranged directly below the welding gun 2 and at the center line of the weldment, and cooperates with the fan 1002 to suck the heat from the welding area and transport it to the inside of the insulation boxes 1004 on both sides for storage through the three-way hose 1003. A check valve is provided at one end of the three-way hose 1003 close to the suction hood 1001 to intercept the output heat flow and prevent backflow. When the weldment is preheated next time, the one-way valves 1006 on both sides can be opened so that the heat energy in the insulation boxes 1004 on both sides is transported by the connecting hoses 1005 on both sides to the edge area cavity in the arc-shaped hoods 805 on both sides for flow and transmission. According to the above-mentioned gradient preheating method, the new weldment is preheated to realize the conversion and recycling of welding heat energy.

[0030] The outer wall of the bidirectional lead screw 4 is threadedly connected with lower clamping blocks 5 on both sides, and the tops of the lower clamping blocks 5 on both sides are hingedly provided with upper clamping blocks 6. The inner walls of the lower clamping blocks 5 and the upper clamping blocks 6 are provided with a plurality of spring ball parts 7 around them. The middle parts of the sides of the lower clamping blocks 5 and the upper clamping blocks 6 on both sides are provided with deformation compensation grooves 11. The deformation compensation grooves 11 adopt a honeycomb support structure, and the flatness error is reduced at high temperatures; Specifically, the bidirectional lead screw 4 drives the lower clamping blocks 5 connected by threads on both sides to move relative or oppositely during the rotation process, and the bearing distance is adjusted according to the length of the weldment. The upper clamping blocks 6 on both sides are rotated respectively to press the weldment. The setting of the spring ball 7 can flexibly squeeze and contact weldments of different sizes, and the adaptability is better. The materials of the lower clamping blocks 5 and the upper clamping blocks 6 on both sides are initially set to high-temperature resistant ceramic composite materials. When the size of the small weldment is shorter and the lower clamping blocks 5 and the upper clamping blocks 6 on both sides are close to the welding area, under the influence of the high temperature environment, the honeycomb structure of the deformation compensation groove 11 disperses the stress through the hexagonal unit arrangement, compensates for the deformation caused by the high temperature, reduces the deformation of the clamping blocks, and ensures the stable positioning of the small weldment.

[0031] Working principle: First, the weldment to be welded is placed in the middle of the lower clamping blocks 5 on both sides, and the upper clamping blocks 6 on both sides are rotated to cover and clamp the weldment. When the size of the small weldment is short, and the lower clamping blocks 5 and the upper clamping blocks 6 on both sides are close to the welding area, under the influence of the high temperature environment, the honeycomb structure of the deformation compensation groove 11 disperses the stress through the hexagonal unit arrangement, compensates for the deformation caused by the high temperature, reduces the deformation of the clamping block, and ensures the stable positioning of the small weldment. The stepper motor 3 drives the bidirectional lead screw 4 to rotate and adjust the spacing between the clamping blocks on both sides. The position of the clamping blocks on both sides is adjusted according to the length of the weldment to ensure stable support for the weldment. The setting of the spring ball 7 can correspond to the rare size flexible contact. Then, the weld of the weldment is placed with reference to the center of the welding gun 2 to prepare for the welding operation; Next, the turntables 803 on both sides are rotated respectively to drive the threaded rods 802 on both sides to rotate inside the rectangular frame 801, so that the connecting strips 804 drive the arc covers 805 on both sides to move in the vertical direction, and match and attach them according to the outer wall size of the weldment. In the previous welding step, the welding heat energy is collected and stored, and then transported to the edge area cavity inside the arc cover 805 during preheating. After being spirally transported by each guide strip 808, it flows into the transition area cavity through each air hole 807 in the middle of the insulation ring 806. The number and inclination angle of the guide strips 808 are set from less to more and from large to small in the edge area to the core area, respectively, so that the friction force of the heat energy airflow during the flow process changes from small to large from the end to the center, and then the temperature changes accordingly, so that the temperature of the three sections of the arc cover 805 changes from the end to the center. At the same time, the bevel gear 1 904 rotates synchronously with the rotation of the bidirectional lead screw 4, and drives the transmission gear 906 to rotate with the meshing bevel gear 2 905, and the support block 908 receives the fixedly connected connecting tooth plate 907 and the electromagnetic induction coil 910, so that the transmission gear 906 can drive the connecting tooth plates 907 on both sides to move closer or farther during the rotation process, thereby ensuring the stability of the adjustment process, driving the electromagnetic induction coils 910 on both sides to move along the welding areas on both sides of the weld of the weld, and cooperating with the electromagnetic induction coils 910 to form a spiral heating trajectory, and by adjusting the rotation speed and power, ensuring that the heat input per unit area is stably matched to welds of different sizes, reciprocating and directional heating around the 5-10cm area on both sides of the weld, and driving the electric clamp 901 to rotate through the pulleys 902 on both sides and the connecting belt 903, the electric clamp 901 clamps the small weld to be welded and rotates synchronously, and a rotating structure is set to drive the weld to rotate, accurately control the range of the heat affected zone, and cooperate with the synchronously moving baffle 911 to isolate the non-preheating area, reduce the energy loss caused by heat diffusion, and ensure uniform and stable heat input; During the welding process, the suction hood 1001 is arranged directly below the welding gun 2 and at the center line of the weldment. The fan 1002 is used to suck the heat from the welding area and transport it to the inside of the insulation boxes 1004 on both sides for storage through the three-way hose 1003. A check valve is provided at one end of the three-way hose 1003 close to the suction hood 1001 to intercept the output heat flow and prevent backflow. When the weldment is preheated next time, the one-way valves 1006 on both sides can be opened so that the heat energy in the insulation boxes 1004 on both sides is transported by the connecting hoses 1005 on both sides to the edge area cavities in the arc-shaped hoods 805 on both sides for flow and transmission. According to the above-mentioned gradient preheating method, the new weldment is preheated to realize the conversion and recycling of welding heat energy.

[0032] The above describes an embodiment of the present invention, but this embodiment is not limited to the above specific implementation methods. The above specific implementation methods are merely illustrative and not restrictive. Under the guidance of this embodiment, ordinary technicians in this field can also make many forms, all of which are protected by this embodiment.

Claims

1. A small-sized weldment precision welding device, characterized in that: include: A welding base (1) and a welding gun (2) are used for welding small weldments; A gradient preheating module (8), a preheating adapter module (9) and a heat energy conversion module (10), wherein the weldment cooperates with the gradient preheating module (8) and the preheating adapter module (9) to achieve temperature gradient preheating before welding, and the heat energy conversion module (10) collects and stores welding heat energy during the welding process of the weldment and uses it for the next preheating of the gradient preheating module (8); The gradient preheating module (8) is provided with two groups of arc-shaped covers (805) and a pair of heat-insulating rings (806) are fixedly connected inside the arc-shaped covers (805), so that the inner wall of the arc-shaped covers (805) is divided from the middle to the two sides into three heat energy transfer cavities, namely a core area, a transition area and an edge area.

2. A small-sized weldment precision welding device according to claim 1, characterized in that: The gradient preheating module (8) comprises: Two groups of symmetrically arranged rectangular frames (801), the middle parts of the rectangular frames (801) are rotatably connected with threaded rods (802), the top ends of the threaded rods (802) penetrate the rectangular frames (801) and are fixedly connected with a turntable (803), the outer walls of the threaded rods (802) are threadedly connected with connecting strips (804), the opposite ends of the connecting strips (804) are fixedly connected with arc covers (805), the inner walls of the core area, transition area and edge area transfer cavities of the arc covers (805) are surrounded by a plurality of guide strips (808), the number and inclination angles of the guide strips (808) are arranged from the edge area to the core area, and from large to small, respectively, and the middle part of the thermal insulation ring (806) is provided with a plurality of air holes (807).

3. A small-sized weldment precision welding device according to claim 2, characterized in that: The preheating adaptation module (9) comprises: An electric clamp (901) is rotatably arranged on the top of a welding base (1); a welding gun (2) is fixedly installed at the center position of the top of the welding base (1); a stepper motor (3) is fixedly connected to the middle of the outer wall of the welding base (1); a bidirectional lead screw (4) is fixedly connected to the driving end of the stepper motor (3); a pulley (902) is fixedly connected to one end of the bidirectional lead screw (4) away from the stepper motor (3) and the middle of the electric clamp (901); the pulleys (902) on both sides are connected by a connecting belt (903); and a bevel gear 1 (904) is fixedly connected to the middle of the outer wall of the bidirectional lead screw (4).

4. A small-sized weldment precision welding device according to claim 1, characterized in that: The middle part of the welding base (1) is rotatably connected to a second bevel gear (905), the second bevel gear (905) is meshingly connected to the first bevel gear (904), and the top of the second bevel gear (905) is fixedly connected to a transmission gear (906).

5. A small-sized weldment precision welding device according to claim 4, characterized in that: Guide grooves (909) are symmetrically provided on both sides of the top of the welding base (1); inner walls of the guide grooves (909) on both sides are slidably connected to support blocks (908); tops of the support blocks (908) on both sides are fixedly connected to connecting toothed plates (907); the connecting toothed plates (907) on both sides are meshingly connected to the transmission gears (906).

6. A small-sized weldment precision welding device according to claim 5, characterized in that: The tops of the connecting tooth plates (907) on both sides are fixedly connected with electromagnetic induction coils (910), and the opposite sides of the electromagnetic induction coils (910) on both sides are fixedly connected with baffles (911).

7. A small-sized weldment precision welding device according to claim 1, characterized in that: The thermal energy conversion module (10) comprises: A suction hood (1001), wherein a fan (1002) is fixedly mounted on the inner wall of the suction hood (1001), a three-way hose (1003) is fixedly provided inside the suction hood (1001) and passes through, and both sides of the top of the arc-shaped hood (805) on both sides are fixedly connected to an insulation box (1004), and the two ends of the three-way hose (1003) away from the suction hood (1001) respectively pass through and extend to the inside of the insulation boxes (1004) on both sides.

8. A small-sized weldment precision welding device according to claim 7, characterized in that: The interior of the thermal insulation boxes (1004) on both sides is fixedly connected with a connecting hose (1005), the outer walls of the connecting hoses (1005) on both sides are fixedly connected with a one-way valve (1006), and the bottom ends of the connecting hoses (1005) on both sides extend through and extend into the cavities of the edge areas of the arc-shaped covers (805) on both sides.

9. A small-sized weldment precision welding device according to claim 3, characterized in that: Lower clamping blocks (5) are threadedly connected to both sides of the outer wall of the bidirectional lead screw (4), upper clamping blocks (6) are hingedly provided at the top of the lower clamping blocks (5) on both sides, and a plurality of spring ball parts (7) are provided around the inner walls of the lower clamping blocks (5) and the upper clamping blocks (6).

10. A small-sized weldment precision welding device according to claim 9, characterized in that: A deformation compensation groove (11) is provided in the middle of the side surfaces of the lower clamping block (5) and the upper clamping block (6) on both sides. The deformation compensation groove (11) adopts a honeycomb support structure, and the flatness error is reduced at high temperature.

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