Welding positioning device for precision mold machining

Abstract

The invention relates to the technical field of precision mold welding processing, and provides a welding positioning device for precision mold processing, which comprises a workbench and a bracket mounted at the top end of the workbench, and feeding mechanisms are installed on one side and one end of the workbench correspondingly, positioning structures are arranged on the tops of the feeding mechanisms correspondingly, a supporting plate is installed on the top of the support, and a clamping mechanism is arranged in the supporting plate. The feeding mechanisms are arranged, the two feeding structures are arranged in an L shape in a staggered mode, a lead screw drives the platform to conduct feeding and discharging, the full-automatic function is achieved, the two feeding structures work in a staggered mode, seamless connection of discharging on one side and synchronous feeding on the other side is achieved, non-machining time is greatly shortened, the vacancy rate of equipment is reduced, and the working efficiency is improved. And the die parts are positioned during feeding, so that the effect of pre-centering before fixing is achieved, deflection errors are avoided, the machining precision is improved, the consistency is ensured, and the clamping process is simplified.

Description

Technical Field

[0001] The present invention relates to the technical field of precision mold welding processing, and particularly relates to a welding positioning device for precision mold processing. Background Art

[0002] Precision molds refer to tools with machining accuracy reaching the micron level, capable of manufacturing products with complex shapes and high surface quality, and are widely used in fields such as automobiles, electronics, and medical treatment. In the processing of precision molds, welding technology is a key link affecting the quality and accuracy of the molds. For example, local defect repairs are carried out on cavity wear, cracks in injection molds, or corner breakage, air holes in die-casting molds, etc. When welding, a special positioning device is required to fix mold parts, ensure the relative position accuracy between parts during the welding process, and prevent displacement caused by thermal deformation or external forces. When fixing columnar mold parts, it is particularly inconvenient to fix, and slippage has occurred, so a special welding positioning device is needed for fixing;

[0003] When the traditional welding positioning device for precision mold processing is working, it requires manual handling and alignment of mold parts, which greatly increases the time consumption. Moreover, manual operations require breaks and shift changes, resulting in an increase in the equipment idle rate and a reduction in production efficiency. At the same time, workers need to place the mold parts at designated positions to facilitate fixing, which increases the labor intensity of workers and leads to an increase in labor costs;

[0004] When the columnar mold parts are positioned and fixed, due to the influence of their surface smoothness, the contact area between the fixture and the parts is too small. During fixed welding, it is easy to cause deviation due to vibration or thermal expansion, resulting in changes in the weld gap and incomplete fusion and incomplete penetration. Summary of the Invention

[0005] The purpose of the present invention is to provide a welding positioning device for precision mold processing to solve the defect of low production efficiency of the existing welding positioning device for precision mold processing.

[0006] To solve the above technical problems, the present invention provides the following technical solution: A welding positioning device for precision mold processing, including a workbench and a bracket installed at the top thereof; a feeding mechanism is installed on one side and one end of the workbench, and a positioning structure is provided at the top of the feeding mechanism. A support plate is installed at the top of the bracket, and a clamping mechanism is arranged inside the support plate; the feeding mechanism includes lead screws, the lead screws are installed on one side and one end inside the workbench, a sliding table is arranged outside the lead screws, and a platform is installed at the top of the sliding table; the positioning structure includes positioning blocks, the positioning blocks are arranged at the edges of the platforms, movable racks are installed at the bottoms of the positioning blocks, a first connecting gear is arranged at the bottom of the center of the platform, and a connecting shaft is installed at the bottom of the first connecting gear.

[0007] Preferably, a hinge seat is fixed to the bottom of the platform, and connecting plates are hinged to both sides of the hinge seat. Rollers are installed at one end of each hinge seat. A flipping structure is formed between the hinge seat and the connecting plate, and a flipping structure is formed between the connecting plate and the sliding table.

[0008] Preferably, pulley mechanisms are connected to one end of each screw rod. Baffles are arranged at one end and one side of the platform, and a sliding structure is formed between the baffle and the roller.

[0009] Preferably, the clamping mechanism includes hinge rings installed inside the support plate. A rotating structure is formed between the hinge rings and the support plate. Movable plates are hinged at the corners of the hinge rings, and clamping blocks are hinged to the ends of the movable plates away from the hinge rings. A sliding mechanism is formed between the clamping blocks and the support plate.

[0010] Preferably, a connecting rod is arranged at the bottom of the clamping block, and a chamber is arranged on one side of the connecting rod. A base is installed at one end of the connecting rod and is connected to the bottom of the clamping block. A second transmission rack is arranged at the top of the connecting rod.

[0011] Preferably, the interiors of the clamping blocks are all cavities. Connecting pipes are connected between the clamping blocks. Suction cups are arranged at opposite ends of the clamping blocks. A conduit is connected to one end of the clamping block, and the end of the conduit away from the clamping block is connected to the chamber.

[0012] Preferably, a piston is arranged inside the chamber, and a piston rod is connected to one end of the piston. A first transmission rack is installed at the end of the piston rod away from the piston, and a transmission gear is arranged at the bottom of the first transmission rack. The transmission gear is meshed with the first transmission rack, and the transmission gear is meshed with the second transmission rack.

[0013] Preferably, first air bags are arranged at the inner ends of the positioning blocks. Slide seats are installed on both sides of the bottom ends of the positioning blocks. Flexible hoses are connected to the bottoms of the first air bags. Slide rails are arranged at the bottoms of the slide seats, and a sliding structure is formed between the slide rails and the slide seats. The movable racks and the first connecting gears are meshed. The movable racks are arranged in a staggered manner. Connecting racks are arranged on the inner walls of the workbench on one side of the first connecting gears.

[0014] Preferably, movable teeth are installed on the outermost sides of the movable racks, and telescopic springs are connected to the tops and bottoms of the movable teeth. A sliding structure is formed between the telescopic springs and the movable teeth, and connecting rods are sleeved outside the telescopic springs.

[0015] Preferably, a [part] is installed at the bottom of the first connecting gear, and a limiting block is arranged at the top of the movable groove. Grooves are arranged in the platforms at the top of the movable groove. The minimum inner diameter of the groove is smaller than the outer diameter of the limiting block, and a sliding structure is formed between the movable groove and the platform. A second airbag is arranged inside the movable groove, and the top of the second airbag is connected to a hose. A second connecting gear is arranged at the bottom of the movable groove, and a return spring is installed at the bottom of the second connecting gear. A ball is installed at the bottom end of the return spring. A sliding structure is formed between the connecting shaft and the second connecting gear. The second connecting gear is meshed with the connecting rack.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: when fixing and clamping the mold parts, the welding positioning device for precision mold processing can be pre-centered while loading, ensuring the consistency of positioning, improving the processing accuracy. Moreover, the two feeding mechanisms are alternately and seamlessly connected for loading and unloading, improving the working efficiency. At the same time, the center clamping is adopted and combined with the suction cup adsorption, making the fixation of the mold parts more firm and preventing deviation.

[0017] 1. By providing a feeding mechanism, the two feeding structures are arranged in an "L" shape and staggered. The platform is driven by a lead screw for feeding and unloading, realizing the fully automatic function. And the two work alternately, realizing the seamless connection of unloading on one side and synchronous loading preparation on the other side, greatly compressing the non-processing time, reducing the equipment vacancy rate, improving the working efficiency, and being suitable for batch order production.

[0018] Furthermore, during the process of conveying the columnar mold parts, through the cooperation of parts such as the connecting rack and the first connecting gear, the positioning block squeezes and centers the mold parts while feeding. When feeding to the inside of the clamping mechanism, it is also located at the central position, achieving the effect of pre-centering before fixation, ensuring that the geometric center of the part completely coincides with the processing reference, avoiding skew errors, improving the processing accuracy, ensuring consistency, and simplifying the clamping process.

[0019] Furthermore, after the mold parts are processed and conveyed to the initial position during unloading, the mold parts are still at the central position of the platform, realizing fixed-point unloading, which is more convenient for subsequent processing, and facilitating the cooperation with automated equipment such as mechanical claws to achieve fixed-point material taking. It can be grabbed without secondary visual positioning, improving the production efficiency.

[0020] 2. By providing a clamping mechanism, the columnar mold parts are located at the central position of the support plate. Through the cooperation of parts such as the movable plate and the hinge ring, the four clamping blocks simultaneously move inward and squeeze to clamp and fix the mold parts. The center clamping makes the mold parts evenly stressed, reduces local stress concentration, and reduces the welding deformation amount.

[0021] Further, while centering and clamping the columnar mold part, through the cooperation of components such as the first driving rack and the driving gear, the suction cup sucks air while clamping, and the suction cup adsorbs to form a negative pressure cavity. With the restraint of centering and clamping, it can still maintain stability in a vibrating environment, improve the anti-offset ability, and the suction cup is made of silicone rubber with uniform contact pressure, which can avoid indentation marks. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a left-view three-dimensional structure schematic diagram of the present invention;

[0023] Figure 2 It is a right-view three-dimensional structure schematic diagram of the present invention;

[0024] Figure 3 It is a top-view three-dimensional structure schematic diagram of the workbench of the present invention in a cut-open state;

[0025] Figure 4 It is a bottom-view three-dimensional structure schematic diagram of the workbench of the present invention in a cut-open state;

[0026] Figure 5 It is a three-dimensional structure schematic diagram of the bracket of the present invention;

[0027] Figure 6 It is a top-view three-dimensional structure schematic diagram of the support plate of the present invention;

[0028] Figure 7 It is a bottom-view three-dimensional structure schematic diagram of the support plate of the present invention;

[0029] Figure 8 It is a three-dimensional structure schematic diagram of the hinge ring of the present invention;

[0030] Figure 9 It is a three-dimensional structure schematic diagram of the movable plate of the present invention;

[0031] Figure 10 It is a three-dimensional structure schematic diagram of the chamber in a cut-open state of the present invention;

[0032] Figure 11 It is a three-dimensional structure schematic diagram of the platform in a raised state of the present invention;

[0033] Figure 12 It is a three-dimensional structure schematic diagram of the platform before feeding of the present invention;

[0034] Figure 13 It is a three-dimensional structure schematic diagram of the platform of the present invention;

[0035] Figure 14 It is a three-dimensional structure schematic diagram of the platform in a cut-open state of the present invention;

[0036] Figure 15 It is a three-dimensional structure schematic diagram of the first connecting gear of the present invention;

[0037] Figure 16 It is a three-dimensional structure schematic diagram of the second connecting gear of the present invention;

[0038] Figure 17 It is a three-dimensional structure schematic diagram of the connecting shaft of the present invention;

[0039] Figure 18 Of the present invention Figure 14 The three-dimensional structure partial enlarged schematic diagram at position A in;

[0040] Figure 19 Of the present invention Figure 15 The three-dimensional structure partial enlarged schematic diagram at position B in.

[0041] Explanation of the reference numerals in the figure: 1, workbench; 2, feeding mechanism; 21, platform; 211, connecting plate; 212, hinge seat; 213, roller; 22, sliding table; 23, lead screw; 24, baffle; 25, pulley mechanism; 3, support plate; 4, clamping mechanism; 41, clamping block; 411, connecting pipe; 412, conduit; 413, suction cup; 42, chamber; 421, first driving rack; 422, driving gear; 423, piston; 424, piston rod; 43, connecting rod; 431, second driving rack; 432, base; 44, hinge ring; 45, movable plate; 5, bracket; 6, positioning structure; 61, positioning block; 611, first air bag; 612, hose; 613, sliding seat; 62, connecting rack; 63, movable rack; 631, movable tooth; 632, telescopic spring; 633, connecting rod; 64, slide rail; 65, first connecting gear; 651, return spring; 652, movable groove; 653, second connecting gear; 654, second air bag; 655, limiting block; 656, ball; 66, connecting shaft. Detailed implementation manners

[0042] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0043] Please refer to Figures 1-19, a welding positioning device for precision mold processing provided by the present invention includes a workbench 1 and a bracket 5 installed on its top; feeding mechanisms 2 are installed on one side and one end of the workbench 1, and positioning structures 6 are arranged on the tops of the feeding mechanisms 2. A support plate 3 is installed on the top of the bracket 5, and a clamping mechanism 4 is arranged inside the support plate 3; the feeding mechanism 2 includes a lead screw 23 installed on one side and one end inside the workbench 1. Slide blocks 22 are arranged on the outer sides of the lead screws 23, and platforms 21 are installed on the tops of the slide blocks 22; the positioning structure 6 includes positioning blocks 61 arranged at the edges of the platforms 21. Moving racks 63 are installed at the bottoms of the positioning blocks 61. A first connecting gear 65 is arranged at the bottom center of the platform 21, and a connecting shaft 66 is installed at the bottom of the first connecting gear 65. One ends of the lead screws 23 are respectively connected with pulley mechanisms 25. Slide seats 613 are installed on both sides of the bottom ends of the positioning blocks 61. Slide rails 64 are arranged at the bottoms of the slide seats 613, and a sliding structure is formed between the slide rails 64 and the slide seats 613. Connecting racks 62 are arranged on the inner walls of the workbench 1 on one side of the first connecting gear 65;

[0044] Referring to Figure 3 , Figure 5 , Figure 14 and Figure 16 As shown in, the device is provided with two groups of feeding mechanisms 2. Two groups of mold parts are respectively placed on two groups of platforms 21. A servo motor is installed at one end of the pulley mechanism 25. After the mold parts are placed, the servo motor is started to drive the lead screw 23 to rotate through the pulley mechanism 25. The slide block 22 outside it is threadedly connected thereto. When the lead screw 23 rotates, it drives the slide block 22 to move inward. During the movement, the second connecting gear 653 at the bottom of the platform 21 contacts and meshes with the connecting rack 62. As the slide block 22 continuously displaces, the second connecting gear 653 rotates, drives the first connecting gear 65 at its top to rotate simultaneously through the connecting shaft 66. The rotation of the first connecting gear 65 causes the moving rack 63 meshing with it to generate displacement, pulling the positioning block 61 to continuously slide inward and close up with the slide rails 64 and the slide seats 613 as the support, pushing the columnar mold parts on the top of the platform 21 to the central position, achieving the positioning effect;

[0045] The inner ends of the positioning blocks 61 are each provided with a first airbag 611. The bottoms of the first airbags 611 are each connected to a hose 612. The movable rack 63 and the first connecting gear 65 are meshed with each other. The movable racks 63 are arranged staggeredly. The bottom of the first connecting gear 65 is provided with 625, and a limiting block 655 is arranged at the top of the movable groove 652. Grooves are arranged in the platforms 21 at the top of the movable groove 652. The minimum inner diameter of the grooves is smaller than the outer diameter of the limiting block 655. The movable groove 652 and the platform 21 form a sliding structure. When the movable groove 652 moves downward when the second airbag 654 expands, the limiting block 655 can prevent the movable groove 652 from separating from the groove. A second airbag 654 is arranged inside the movable groove 652, and the top of the second airbag 654 is connected to the hose 612. The bottom of the movable groove 652 is provided with a second connecting gear 653, and a return spring 651 is installed at the bottom of the second connecting gear 653. A ball 656 is installed at the bottom end of the return spring 651. The design of the ball 656 can reduce the friction between the movable groove 652 and the second connecting gear 653 when the second connecting gear 653 rotates. The connecting shaft 66 and the second connecting gear 653 form a sliding structure. The second connecting gear 653 and the connecting rack 62 are meshed with each other;

[0046] Refer to Figure 14 , Figure 16 , Figure 17 and Figure 19 As shown in, the number of teeth of the connecting rack 62 is based on the diameter of the smallest mold part to be positioned. When the diameter of the columnar mold part is greater than the standard value, the positioning block 61 first presses on the mold part, squeezing the first airbag 611 on the inner wall of the positioning block 61, causing the gas inside it to be transported through the hose 612 to the inside of the second airbag 654. As the four first airbags 611 are continuously squeezed, the second airbag 654 also continuously expands, pushing the movable groove 652 downward and pressing on the second connecting gear 653. When the mold part is squeezed to the central position, the four first airbags 611 are all compressed, and all the gas enters the second airbag 654, causing the expansion to reach the maximum value. The movable groove 652 presses the second connecting gear 653 downward away from the bottom of the connecting rack 62, so that the second connecting gear 653 is no longer affected by the remaining teeth of the connecting rack 62, thereby achieving force relief and avoiding mechanical damage caused by over-squeezing the mold part. The platform 21 drives the mold part to continue moving. Under the slow restoring force of the return spring 651, the second connecting gear 653 will be slowly lifted to the original position, causing the gas in the second airbag 654 to return to the inside of the first airbag 611, driving the positioning block 61 to displace outward, and the first airbag 611 expands to fit with the mold part;

[0047] A hinge seat 212 is fixed to the bottom of the platform 21, and connecting plates 211 are hinged to both sides of the hinge seat 212. Rollers 213 are installed at one end of the hinge seat 212. A flipping structure is formed between the hinge seat 212 and the connecting plate 211, and a flipping structure is formed between the connecting plate 211 and the sliding table 22. Baffles 24 are provided at one end and one side of the platform 21, and a sliding structure is formed between the baffle 24 and the roller 213;

[0048] Refer to Figure 3 , Figure 5 and Figure 11 As shown, the lead screw 23 rotates continuously to drive the platform 21 to convey the mold parts. During the continuous movement, the hinge seat 212 under the platform 21 abuts against the baffle 24. A chute is provided on the side wall of the baffle 24. When the hinge seat 212 abuts, since the sliding table 22 continuously moves under the rotational force of the lead screw 23, the connecting plate 211 is pushed to continuously flip, supporting the platform 21 to continuously rise. The roller 213 at one end of the hinge seat 212 slides in the chute, reducing the frictional force generated when the hinge seat 212 abuts and rises and slides against the baffle 24. The platform 21 rises to convey the mold parts to the center position of the support plate 3 for clamping and fixing. The center position of the platform 21 corresponds to the center of the support plate 3. At the same time, the rising height can be adjusted according to the position where welding and processing are required, and the position on the surface of the clamped mold parts can be controlled, so as to avoid blocking the welding range during clamping;

[0049] The clamping mechanism 4 includes a hinge ring 44. The hinge ring 44 is installed inside the support plate 3, and a rotational structure is formed between the hinge ring 44 and the support plate 3. Moving plates 45 are hinged at the corners of the hinge ring 44, and clamping blocks 41 are hinged at the ends of the moving plates 45 away from the hinge ring 44. A sliding mechanism is formed between the clamping blocks 41 and the support plate 3. A connecting rod 43 is provided at the bottom of the clamping block 41, and a chamber 42 is provided on one side of the connecting rod 43. A base 432 is installed at one end of the connecting rod 43, and the base 432 is connected to the bottom of the clamping block 41. A second transmission rack 431 is provided at the top of the connecting rod 43;

[0050] Refer to Figures 6-8 As shown, when the mold parts rise to the center of the support plate 3, a cylinder is installed at one end of the connecting rod 43. The cylinder is started to drive the base 432 to displace inward through the connecting rod 43. The base 432 is connected to one group of clamping blocks 41. When the base 432 displaces, it drives the clamping block 41 to slide inward along the surface of the support plate 3. At the same time, moving plates 45 are hinged at the bottoms of the clamping blocks 41. When one group of clamping blocks 41 move, the hinge ring 44 is pushed to rotate through the moving plate 45, thereby pulling the remaining moving plates 45 to drive the clamping blocks 41 to slide, realizing the phenomenon that the four groups of clamping blocks 41 slide inward simultaneously to squeeze and fix the mold parts at the center position;

[0051] The interiors of the clamping blocks 41 are all cavities. Connecting pipes 411 are connected between the clamping blocks 41. Suction cups 413 are arranged at opposite ends of the clamping blocks 41. One end of the clamping block 41 is connected to a conduit 412, and the end of the conduit 412 far from the clamping block 41 is connected to the chamber 42. A piston 423 is arranged inside the chamber 42, and one end of the piston 423 is connected to a piston rod 424. A first transmission rack 421 is installed at the end of the piston rod 424 far from the piston 423, and a transmission gear 422 is arranged at the bottom of the first transmission rack 421. The transmission gear 422 and the first transmission rack 421 are meshed and connected, and the transmission gear 422 and a second transmission rack 431 are meshed and connected;

[0052] Referring to Figure 2 、 Figure 3 、 Figure 5 、 Figure 8 、 Figure 9 and Figure 10 As shown, during the process of clamping the mold parts, the connecting rod 43 continuously displaces and contacts the transmission gear 422. Since the connecting rod 43 and the transmission gear 422 are meshed, the displacement after contact will drive the transmission gear 422 to rotate, thereby driving the first transmission rack 421 engaged with it to displace, pulling the piston rod 424 at its end and the piston 423 fixed thereto to move. The piston 423 displaces inside the chamber 42, causing the air in the clamping block 41 to enter the chamber 42 through the conduit 412. The clamping blocks 41 are connected to each other through the connecting pipe 411, and the gas is sucked into the chamber 42. Thus, when the suction cup 413 contacts the mold parts, a strong adsorption force is generated on the suction cup 413, firmly adsorbing the arc surface of the mold parts. While squeezing and clamping them, they are fixed again by the suction force, effectively enhancing the stability of the fixation. At the same time, a pressure relief valve is arranged at the rear end of the chamber 42. When the pressure inside the chamber 42 is too high, automatic pressure relief can be carried out. When the mold parts are fixed, the servo motor is started to drive the lead screw 23 to reverse through the pulley mechanism 25, lowering the platform 21 to coincide with the workbench 1. Then, welding processing is carried out on the mold parts. At the same time, a servo motor is installed on one side of the support plate 3, which can control the servo motor to drive the support plate 3 to rotate to any angle for welding processing of the mold parts. After the welding processing is completed, the servo motor is started again to drive the lead screw 23 to rotate, raising the platform 21. Then, the air cylinder is started to expand the clamping blocks 41. After the mold parts lose the clamping, they move to the top of the platform 21. Then, the servo motor is started to drive the lead screw 23 to reverse, driving the platform 21 and the mold parts above to displace to the front end of the workbench 1. While the platform 21 is descending, another set of lead screws 23 is started to rotate to drive the mold parts on the platform 21 to displace. At this time, the welded mold parts are translated and reset to one end, while the mold parts that have not been welded are conveyed to the position of the support plate 3 for clamping and welding, with staggered conveyance, thereby saving time and improving work efficiency;

[0053] The outermost sides of the movable racks 63 are each provided with movable teeth 631, and telescopic springs 632 are connected to the top and bottom of the movable teeth 631. A sliding structure is formed between the telescopic springs 632 and the movable teeth 631, and connecting rods 633 are sleeved outside the telescopic springs 632;

[0054] Referring to Figure 11 、 Figure 14 、 Figure 16 and Figure 18 As shown, when the welding and processing of the mold parts are completed and conveyed outwards, the second connecting gear 653 contacts and meshes with the connecting rack 62 again, causing the first connecting gear 65 to reverse, driving the movable rack 63 and the positioning block 61 on its top to displace and reset outwards. When the positioning block 61 reaches the initial position, the movable rack 63 rotates and contacts the movable teeth 631 at the outermost end of the movable rack 63. Under the push of the rotational force, the movable teeth 631 slide inwards, causing the first connecting gear 65 to idle when the second connecting gear 653 continues to mesh with the connecting rack 62. When the mold parts are positioned again, the connecting rod 633 pushes the movable teeth 631 to mesh with the first connecting gear 65 again to achieve combined positioning. When the mold parts are conveyed to the initial position, they are always located at the central position, facilitating the staff to place and take them, and at the same time, they can cooperate with the mechanical gripper for positioning and material taking, improving work efficiency.

[0055] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A welding positioning device for precision mold processing, characterized in that: It includes a workbench (1) and a bracket (5) installed at its top; Feeding mechanisms (2) are installed on one side and one end of the workbench (1), and positioning structures (6) are arranged on the tops of the feeding mechanisms (2). A support plate (3) is installed on the top of the bracket (5), and a clamping mechanism (4) is arranged inside the support plate (3); The feeding mechanism (2) includes a lead screw (23). The lead screw (23) is installed on one side and one end inside the workbench (1). Slide blocks (22) are arranged on the outer sides of the lead screws (23), and platforms (21) are installed on the tops of the slide blocks (22); The positioning structure (6) includes positioning blocks (61). The positioning blocks (61) are arranged at the edges of the platforms (21). Movable racks (63) are installed at the bottoms of the positioning blocks (61). A first connecting gear (65) is arranged at the bottom center of the platform (21), and a connecting shaft (66) is installed at the bottom of the first connecting gear (65).

2. The welding positioning device for precision mold processing according to claim 1, wherein: Hinge seats (212) are fixed at the bottoms of the platforms (21). Connecting plates (211) are hinged on both sides of the hinge seats (212). Rollers (213) are installed at one ends of the hinge seats (212). A flipping structure is formed between the hinge seats (212) and the connecting plates (211), and a flipping structure is formed between the connecting plates (211) and the slide blocks (22).

3. The welding positioning device for precision mold processing according to claim 2, wherein: One ends of the lead screws (23) are all connected with pulley mechanisms (25). Baffles (24) are arranged at one side and one end of the platform (21), and a sliding structure is formed between the baffles (24) and the rollers (213).

4. A welding positioning device for precision mold processing according to claim 1, characterized in that: The clamping mechanism (4) includes hinge rings (44). The hinge rings (44) are installed inside the support plate (3), and a rotating structure is formed between the hinge rings (44) and the support plate (3). Movable plates (45) are hinged at the corners of the hinge rings (44), and clamping blocks (41) are hinged at the ends of the movable plates (45) far away from the hinge rings (44). A sliding mechanism is formed between the clamping blocks (41) and the support plate (3).

5. The welding positioning device for precision mold processing according to claim 4, wherein: Link rods (43) are arranged at the bottoms of the clamping blocks (41). Chambers (42) are arranged on one sides of the link rods (43). Bases (432) are installed at one ends of the link rods (43), and the bases (432) are connected with the bottoms of the clamping blocks (41). Second transmission racks (431) are arranged at the tops of the link rods (43).

6. The welding positioning device for precision mold processing according to claim 4, characterized in that: The interiors of the clamping blocks (41) are all hollow. Connecting pipes (411) are connected between the clamping blocks (41). Suction cups (413) are arranged at the opposite ends of the clamping blocks (41). A conduit (412) is connected to one end of the clamping block (41), and the end of the conduit (412) far away from the clamping block (41) is connected with the chamber (42).

7. A welding positioning device for precision mold processing according to claim 5, characterized in that: Inside the chamber (42), a piston (423) is provided, and one end of the piston (423) is connected to a piston rod (424). At the end of the piston rod (424) away from the piston (423), a first transmission rack (421) is installed, and at the bottom of the first transmission rack (421), a transmission gear (422) is provided. The transmission gear (422) and the first transmission rack (421) are meshed with each other, and the transmission gear (422) and a second transmission rack (431) are meshed with each other.

8. A welding positioning device for precision mold processing according to claim 1, characterized in that: At the inner ends of the positioning blocks (61), first air bags (611) are provided. At both sides of the bottom ends of the positioning blocks (61), sliding seats (613) are installed. At the bottoms of the first air bags (611), hoses (612) are connected. At the bottoms of the sliding seats (613), slide rails (64) are provided, and a sliding structure is formed between the slide rails (64) and the sliding seats (613). A meshing connection is formed between the movable racks (63) and the first connecting gears (65). The movable racks (63) are arranged in a staggered manner. On the inner walls of the workbench (1) on one side of the first connecting gears (65), connecting racks (62) are provided.

9. A welding positioning device for precision mold processing according to claim 1, characterized in that: At the outermost sides of the movable racks (63), movable teeth (631) are installed, and at the tops and bottoms of the movable teeth (631), telescopic springs (632) are connected. A sliding structure is formed between the telescopic springs (632) and the movable teeth (631). Connecting rods (633) are sleeved outside the telescopic springs (632).

10. A welding positioning device for precision mold processing according to claim 8, characterized in that: At the bottom of the first connecting gear (65), (625) is installed, and at the top of the movable slot (652), a limiting block (655) is provided. In the platforms (21) at the top of the movable slot (652), slots are provided. The minimum inner diameter of the slots is smaller than the outer diameter of the limiting block (655), and a sliding structure is formed between the movable slot (652) and the platform (21). Inside the movable slot (652), a second air bag (654) is provided, and the top of the second air bag (654) is connected to the hose (612). At the bottom of the movable slot (652), a second connecting gear (653) is provided, and at the bottom of the second connecting gear (653), a return spring (651) is installed. At the bottom end of the return spring (651), a ball (656) is installed. A sliding structure is formed between the connecting shaft (66) and the second connecting gear (653). The second connecting gear (653) and the connecting rack (62) are meshed with each other.

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