Precious metal welding equipment

Abstract

The utility model relates to the field of precious metal machining equipment, and particularly discloses precious metal welding equipment which comprises a main machine table, a high-frequency heating unit, a water pump unit, an air supply unit, an air exhaust unit, a control unit, a lifting frame set, a driving unit and a welding cabin. The welding cabin comprises an outer frame body, a pressure cover, a sealing plate, a fixed platform, a movable platform, a temperature sensor and a pressure sensor; through the arrangement of the pressure cover and the sealing plate, a sealed environment which is completely filled with protective gas can be provided when the upper die and the lower die are closed for heating and welding, so that the constant temperature during welding can be guaranteed, and the oxidation prevention effect can be achieved; and when the pressure cover and the sealing plate are combined for pressure maintaining, the pressure value of the upper die and the lower die during die assembly can be precisely adjusted through the driving unit, so that the effect of precisely adjusting the pressure value is achieved, overpressure and pressure loss are prevented, and the welding precision and the operation effect are improved.

Description

Technical Field

[0001] This utility model belongs to the field of precious metal processing equipment, and specifically relates to a precious metal welding equipment. Background Technology

[0002] Welding of two-tone precious metals is a technically demanding process in precious metal processing, referring to the combination of two different precious metals (such as gold and platinum, silver and palladium). Existing methods for welding two-tone precious metals typically include laser welding, flame welding, and ultrasonic welding. While laser welding offers high precision, the equipment is expensive, and the high reflectivity of precious metals results in low laser energy absorption. Furthermore, the high thermal conductivity of precious metals makes heat concentration difficult. Flame welding requires flux, is only suitable for thick parts, produces poor weld quality, and requires oxidation prevention. Ultrasonic welding, due to the relatively soft nature of precious metals, is prone to deformation at the weld joint after high-frequency vibration, affecting the appearance. Its high thermal conductivity also makes heat concentration difficult, leading to insufficient temperature. To address these shortcomings, a new welding equipment is urgently needed to solve the problems of poor heat concentration, easy oxidation, and weld deformation at the weld joint, resulting in poor weld quality and difficulty in quality control when welding precious metals using traditional methods.

[0003] Patent document with application number "CN2020208629332" discloses a precious metal diffusion welding machine, belonging to the field of metal processing equipment. It includes a control box equipped with a vacuum pressurization system. A locking cylinder and a lifting cylinder are fixedly connected inside the control box. A guide rail and a welding chamber are located on the top of the control box. A lifting plate is fixedly connected to the cylinder shaft of the locking cylinder. The lifting cylinder is movably connected to the lifting plate. A guide post is fixedly connected to the lifting plate and slidably connected to the guide rail. A top cover is fixedly connected above the guide post, and an upper quartz clamp is fixedly connected below the top cover. The welding chamber includes a diffusion chamber connected to the vacuum pressurization system. An electric heating coil is installed on the diffusion chamber. A graphite crucible and a lower quartz clamp are installed inside the diffusion chamber. The lower quartz clamp is fixed to a connecting rod, which passes through the welding chamber and is fixedly connected to the cylinder shaft of the lifting cylinder. Although this welding device can solve the problems of easy oxidation and difficulty in heat concentration during precious metal welding, the device is driven by a cylinder and the upper and lower quartz clamps are rigidly connected to the top cover and diffusion chamber. Therefore, the accuracy of pressure control and the stability of air pressure in the pressing state cannot be guaranteed, which will affect the processing quality.

[0004] The above background information is provided only to assist in understanding the utility model concept and technical solution of this utility model, and it does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above information was disclosed on the filing date of this patent application, the above background information should not be used to evaluate the novelty and inventiveness of this application. Summary of the Invention

[0005] The purpose of this invention is to provide a precious metal welding device that overcomes the shortcomings of existing two-color precious metal welding processes, such as difficulty in concentrating heat, easy oxidation of welding materials, and inability to guarantee weld quality.

[0006] To achieve the above objectives, this utility model provides a precious metal welding device, including a main machine base. The main machine base contains several independent welding chambers. Each welding chamber contains a fixed platform and a movable platform. An upper mold and a lower mold are respectively mounted on the fixed platform and the movable platform, and the upper and lower molds are matched to each other. Each welding chamber has an outer frame, within which a pressure hood and a sealing plate are located. The bottom of the pressure hood has an opening. The fixed platform and the upper mold are located within the pressure hood. An air inlet pipe and an air extraction pipe are located at the top of the pressure hood. A heating coil is also provided inside the pressure hood, and the heating coil is fitted around the upper mold. The main machine tool is also equipped with a high-frequency heating unit, a drive unit, a water pump unit, an air supply unit, and an air extraction unit; the air supply unit and the air extraction unit are respectively connected to the air inlet pipe and the air extraction pipe; the high-frequency heating unit is electrically connected to the heating coil; the output end of the drive unit is equipped with a lifting frame assembly, the top of the lifting frame assembly is fixedly connected to the moving platform, and the sealing plate is elastically connected to the lifting frame assembly through an elastic element. When the drive unit drives the lifting frame assembly to approach the fixed platform, the sealing plate can first contact the bottom of the pressure cover and seal the cover opening, and then the moving platform continues to approach the fixed platform.

[0007] Preferably, in the above technical solution, the main machine tool has an operating port on its front side, a workbench is provided below the operating port, and a flip-up protective plate is provided above the operating port. Each welding chamber has an independent operating button and an emergency stop button on its side. When the protective plate is flipped downwards, it can cover the upper area of ​​the pressure cover and expose the operating button and the emergency stop button to the outside. A control unit is provided outside the main machine tool, and the control unit is connected to the main machine tool through a rotating arm assembly. A baffle is provided on the side of the sealing plate facing the operating port.

[0008] Preferably, in the above technical solution, a first cooling water channel group is provided inside the pressure shroud, and a second cooling water channel group is provided inside the workbench. The first cooling water channel group and the second cooling water channel group are simultaneously connected to the water pump unit.

[0009] Preferably, the above technical solution further includes a temperature sensor and a pressure sensor. The fixed platform is connected to the inner wall of the top of the pressure cover by bolts. The pressure sensor is installed between the top surface of the fixed platform and the pressure cover. A first heat dissipation hole is provided through the top and bottom surfaces of the fixed platform. The first heat dissipation hole is located above the heating coil. A first mounting groove is provided at the top of the pressure cover. A second heat dissipation hole is provided at the bottom of the first mounting groove. The temperature sensor is installed in the first mounting groove. The first heat dissipation hole and the second heat dissipation hole are connected. The pressure sensor and the temperature sensor are electrically connected to the control unit.

[0010] Preferably, in the above technical solution, the fixed platform is provided with a third cooling water channel group, and the third cooling water channel group is interconnected with the water pump unit.

[0011] Preferably, in the above technical solution, the top surface of the fixed platform is provided with two or more water guide pipes. One end of the water guide pipe is connected to the third cooling water channel, and the other end of the water guide pipe passes through the pressure cover and the outer frame in sequence and extends upward. An elastic rubber ring is provided between the top surface of the fixed platform and the pressure cover. The number of elastic rubber rings and the number of pressure sensors are consistent with the number of water guide pipes. The pressure sensors and one end of the water guide pipes that are in corresponding positions are all located inside the elastic rubber rings.

[0012] Preferably, in the above technical solution, a first sealing ring is provided around the bottom of the first mounting groove, the second heat dissipation holes are all located inside the first sealing ring, and the bottom of the temperature sensor is in close contact with the first sealing ring.

[0013] Preferably, in the above technical solution, a first observation window is provided on the side of the pressure cover facing the operation port and a pressure gauge is installed thereon, a second observation window is provided on the side of the pressure cover, and a monitoring camera is installed at the second observation window. The monitoring camera is electrically connected to the control unit.

[0014] Preferably, in the above technical solution, the outer side of the pressure shield is provided with two parallel first guide blocks, and a first adjusting plate is provided between the two first guide blocks. The first adjusting plate has a first elongated hole and a first clearance opening. The first elongated hole is aligned with the direction of the first guide block. Two parallel second guide blocks are installed on the first adjusting plate, and the second guide blocks are perpendicular to the first guide blocks. A second adjusting plate is provided between the two second guide blocks. The second adjusting plate has a second elongated hole and a second clearance opening. The second elongated hole is aligned with the direction of the second guide block. A clamping block is installed at the second clearance opening. The side of the pressure shield is open. A third clearance opening is provided, through which the wiring terminals of the heating coil can sequentially pass and be clamped and fixed by the clamping block; a first adjusting screw is provided between the pressure cover and the first adjusting plate, which can drive the first adjusting plate to move along the first guide block; a second adjusting screw is provided between the first adjusting plate and the second adjusting plate, which can drive the second adjusting plate to move along the second guide block; and sealing gaskets are provided between the first adjusting plate and the pressure cover, between the second adjusting plate and the first adjusting plate, and between the clamping block and the second adjusting plate.

[0015] Preferably, in the above technical solution, the drive unit includes a drive motor, a drive screw, and a sliding sleeve. The drive motor is mounted on the bottom of the outer frame via a motor bracket, and the output shaft of the drive motor is coaxially and fixedly connected to the drive screw. The lifting frame assembly includes several push rods and push plates. The push plates are fixedly connected to the middle of the push rods and are perpendicular to each other. The push rods are parallel to the drive screw. The sliding sleeve is fixedly connected to the lower end of the push rods and matches the drive screw. The moving platform is fixedly connected to the top end of the push rods. A guide sleeve is installed on the sealing plate. The guide sleeve is slidably fitted onto the push rods. A second sealing ring is provided between the guide sleeve and the push rods. An elastic element is connected between the push plate and the sealing plate to allow the sealing plate to float elastically along the push rods. A third sealing ring is provided on the top surface of the sealing plate.

[0016] Compared with existing technologies, this utility model has the following beneficial effects:

[0017] 1. The precious metal welding equipment of this utility model, by being equipped with a pressure cover and a sealing plate, provides a sealed environment filled with protective gas when the upper and lower molds are closed for heating and welding. This ensures a constant welding temperature and prevents oxidation. Furthermore, the sealing plate is floatingly and elastically connected to the lifting frame assembly. When the pressure cover and sealing plate are closed to maintain pressure, the pressure value when the upper and lower molds are closed can be precisely adjusted by the drive unit. This allows for precise adjustment of the pressure value, preventing overpressure and underpressure, thereby improving welding accuracy and work efficiency.

[0018] 2. This utility model is equipped with multiple welding chambers. By changing the types of upper and lower molds, it can process a single type of workpiece or different types of workpieces at the same time, thereby improving the production cycle. The operator can easily perform loading and unloading operations and monitor the working status of multiple welding chambers through a single operating port. The control unit is set outside the main machine through a rotating arm assembly, which not only facilitates the operator's operation but also avoids the high temperature inside the main machine from interfering with the electronic components in the control unit and affecting stability.

[0019] 3. The pressure shield and the fixed platform of this utility model are respectively equipped with a first cooling water channel group and a second cooling water channel group, which can not only dissipate heat from the pressure shield and protect external personnel, temperature sensors and pressure sensors, but also control the flow rate in each cooling water channel through the water pump unit, so as to quickly cool down when the temperature inside the welding chamber is too high, thereby making the temperature inside the chamber balanced and stable; the workbench is equipped with a third cooling water channel to cool the workbench and protect the operator when loading and unloading materials.

[0020] 4. In this utility model, an elastic rubber ring is provided on the outer periphery of the pressure sensor and one end of the water pipe. The elastic rubber ring can not only seal and maintain pressure and prevent the pressure sensor from being interfered with, but also realize the soft connection between the fixed platform and the pressure cover. It has a certain amount of floating, which makes it convenient for the pressure sensor to measure the pressure value and give feedback, thereby achieving the effect of precise pressure adjustment.

[0021] 5. The pressure cover of this utility model has a first observation window and a second observation window on its side. A monitoring camera is installed outside the second observation window, and the image can be transmitted to the control unit. Thus, even when the protective plate blocks the first observation port, the operator can still conveniently observe the status of the workpiece in the control unit in real time. Furthermore, the monitoring camera is located outside the welding chamber, which can prevent overheating and affect its service life.

[0022] 6. The heating coil in this utility model can be adjusted in both vertical and horizontal directions via the first adjusting screw, the second adjusting screw, the first adjusting plate, and the second adjusting plate. It can also be easily installed and disassembled via the clamping plate, thus enabling the heating of tooling workpieces of different sizes and positions, providing greater flexibility and adaptability. In addition, the temperature sensor is installed above the heating coil, allowing heat to rise directly to the detection surface of the temperature sensor, thereby enabling it to more accurately measure the true temperature around the welded workpiece.

[0023] 7. The drive unit in this utility model uses a drive screw and a sliding sleeve to drive the lifting frame assembly to lift and lower, which not only has higher adjustment accuracy, but also can self-lock to prevent pressure loss; the push rod can not only push and support the moving platform, but also cooperate with the guide sleeve to guide the movement of the sealing plate. The design is more compact and ingenious, reducing equipment costs. Attached Figure Description

[0024] Figure 1 This is a structural diagram of the precious metal welding equipment in this utility model.

[0025] Figure 2 This is a structural diagram of the welding chamber.

[0026] Figure 3 This is a structural diagram of the welding chamber from another perspective.

[0027] Figure 4 This is a partial cross-sectional view of the pressure shield.

[0028] Figure 5 This is a structural diagram of the first adjusting plate, the second adjusting plate, and the clamping block.

[0029] Figure 6 It is a partial sectional view of the fixed platform and the upper mold.

[0030] Figure 7 This is a partial sectional view of the workbench.

[0031] Figure 8 It is a structural diagram of the lifting frame assembly, the moving platform, and the sealing plate.

[0032] Explanation of key figure labels:

[0033] 100-Main machine base, 120-Operating port, 130-Workbench, 131-Second cooling water channel group, 140-Protective plate, 150-Operating buttons, 160-Emergency stop button, 170-Control unit, 180-Rotating arm assembly;

[0034] 200-Welding chamber, 210-Outer frame, 220-Pressure cover, 221-Cover opening, 222-First mounting slot, 223-Second heat dissipation hole, 224-First sealing ring, 225-First observation window, 226-Pressure gauge, 227-Second observation window, 228-Monitoring camera, 229-Third clearance opening, 230-Sealing plate, 231-Baffle, 240-Inlet pipe, 250-Exhaust pipe, 260-Heating ring, 270-Third sealing ring, 280-First cooling water channel assembly;

[0035] 300-Fixed platform, 310-Upper mold, 320-First heat dissipation hole, 330-Third cooling water channel group, 340-Water guide pipe, 350-Elastic rubber ring;

[0036] 400 - Mobile platform, 410 - Lower mold;

[0037] 500-Drive unit, 510-Drive motor, 520-Drive screw, 530-Sliding sleeve seat, 540-Motor bracket;

[0038] 600 - Temperature sensor; 610 - Pressure sensor;

[0039] 700-First guide block, 710-First adjusting plate, 711-First elongated hole, 712-First clearance opening, 720-Second guide block, 730-Second adjusting plate, 731-Second elongated hole, 732-Second clearance opening, 740-Clamping block, 750-First adjusting screw, 760-Second adjusting screw, 770-Adjusting bolt, 780-Pull rod, 790-Nut, 791-Anti-loosening spring;

[0040] 800-Lifting frame assembly, 810-Push rod, 820-Push plate, 830-Guide sleeve, 840-Second sealing ring, 850-Elastic element, 860-Guide rail, 870-Slider. Detailed Implementation

[0041] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0042] In the description of this utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "top surface", "bottom surface", "inner", "outer", "inner side", "outer side", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0043] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If the terms "first," "second," and "third" are used in the description, they are for descriptive purposes and to distinguish technical features, and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the sequential relationship of the indicated technical features.

[0044] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The embodiments of this utility model will now be described based on its overall structure.

[0045] like Figures 1 to 8As shown, the precious metal welding equipment in this embodiment includes: a main machine base 100, an operating port 120, a workbench 130, a second cooling water channel assembly 131, a protective plate 140, operating buttons 150, an emergency stop button 160, a control unit 170, a rotating arm assembly 180, a welding chamber 200, an outer frame 210, a pressure cover 220, a cover opening 221, a first mounting groove 222, a second heat dissipation hole 223, a first sealing ring 224, a first observation window 225, a pressure gauge 226, a second observation window 227, a monitoring camera 228, a third clearance opening 229, a sealing plate 230, an air inlet pipe 240, an air extraction pipe 250, a heating ring 260, a third sealing ring 270, a fixed platform 300, an upper mold 310, a first heat dissipation hole 320, and a third cooling water channel assembly 131. The components include: a water channel assembly 330, a water guide pipe 340, an elastic rubber ring 350, a moving platform 400, a lower mold 410, a drive unit 500, a drive motor 510, a drive screw 520, a sliding sleeve seat 530, a temperature sensor 600, a pressure sensor 610, a first guide block 700, a first adjusting plate 710, a first elongated hole 711, a first clearance opening 712, a second guide block 720, a second adjusting plate 730, a second elongated hole 731, a second clearance opening 732, a clamping block 740, a first adjusting screw 750, a second adjusting screw 760, an adjusting bolt 770, a pull rod 780, a nut 790, an anti-loosening spring 791, a lifting frame assembly 800, a push rod 810, a push plate 820, a guide sleeve 830, a second sealing ring 840, and an elastic element 850.

[0046] The main machine base 100 has an outer shell plate on its outer side. An operation port 120 is located on the front of the main machine base 100. Below the operation port 120, an outwardly extending workbench 130 is installed. Inside the main machine base, there are two or more independently configured welding chambers 200, as well as a high-frequency heating unit, a drive unit 500, a water pump unit, an air supply unit, and an air extraction unit. The welding chambers 200 are separated from other units by partitions, and the number of high-frequency heating units corresponds to the number of welding chambers 200. Each welding chamber 200 has an independent operation button 150 and an emergency stop button 160 installed on its side. The operation button 150 includes a close button and a release button. The welding chamber 200 consists of an outer frame 210, a pressure cover 220, and a sealing plate 2. The system consists of three components: an outer frame 210 with a rectangular frame structure and fixedly connected to the main unit; a pressure cover 220 and a sealing plate 230 housed within the outer frame 210; a cover opening 221 at the bottom of the pressure cover 220 and a top fixedly connected to the top of the outer frame 210; a fixed platform 300 and an upper mold 310 located within the pressure cover 220; the fixed platform 300 is fixedly connected to the inner wall of the top of the pressure cover 220 by bolts; and the upper mold 310 is detachably mounted on the bottom of the fixed platform 300. An air inlet pipe 240 and an air extraction pipe 250, communicating with the interior of the pressure cover 220, are installed on the top of the pressure cover 220. The top ends of the air inlet pipe 240 and the air extraction pipe 250 extend outward from the top of the outer frame 210. (The last sentence appears to be incomplete and possibly refers to an air supply unit.) The air extraction unit is connected to the air inlet pipe 240 and the air extraction pipe 250 respectively. The air supply unit includes an air supply pump, an electrically controlled valve, and is connected to an external independent protective gas tank. The protective gas tank can be selected and replaced according to the type of precious metal being welded, such as argon, helium, or nitrogen. The air extraction unit includes an air extraction pump, an electrically controlled valve, and an exhaust gas box. The heating coil 260 is installed inside the pressure cover 220 and sleeved around the outer periphery of the upper mold 310. The heating coil 260 has a spiral structure. The high-frequency heating unit 110 is electrically connected to the wiring terminals of the heating coil 260. The drive unit 500 is installed below the outer frame 210. The lifting frame assembly 800 is connected to the output terminal of the drive unit 500. The drive unit 500 can drive the lifting frame to the fixed platform 3. As the lifting frame assembly 800 approaches the fixed platform 300, the top of the lifting frame assembly 800 is fixedly connected to the moving platform 400. The sealing plate 230 is elastically connected to the lifting frame assembly 800 through the elastic element 850 and can elastically float along the moving direction of the lifting frame. A baffle 231 is fixedly installed on the side of the sealing plate 230 facing the operating port 120. When the driving unit 500 drives the lifting frame assembly 800 to approach the fixed platform 300, the sealing plate 230 can first contact the bottom of the pressure cover 220 and seal the cover opening 221. At the same time, the sealing plate 230 can drive the baffle 231 to rise together and block the area below the sealing plate 230. Then the moving platform 400 continues to approach the fixed platform 300, so that the upper mold 310 and the lower mold 410 are interlocked.The top edge of the protective plate 140 is hinged to the upper part of the operating port 120, allowing the bottom of the protective plate 140 to be flipped upwards and opened. When the protective plate 140 is closed, it can cover the area above the pressure cover 220. The operating button 150 is installed below the bottom edge of the protective plate 140 and exposed to the outside for easy operation by the operator. The control unit 170 is connected to the main machine base 100 via the rotating arm assembly 180. The operator can pull the control unit 170 closer to the operating port 120 during operation using the rotating arm assembly 180. A touch screen is installed on the control unit 170.

[0047] In addition, a first observation window 225 is provided on the side of the pressure cover 220 facing the operation port 120 and a pressure gauge 226 is installed thereon. A second observation window 227 is provided on the side of the pressure cover 220. A monitoring camera 228 is installed at the second observation window 227. The monitoring camera 228 is electrically connected to the control unit 170. The image presented by the monitoring camera 228 can be displayed on the touch screen of the control unit 170.

[0048] Additionally, a first cooling water channel assembly 280 is provided on the inner walls of the sides and top of the pressure shroud 220, surrounding the first observation window 225 and the second observation window 227. A second cooling water channel assembly 131 is provided inside the workbench 130, with the ends of the second cooling water channel assembly 131 interconnected by flexible hoses to form an S-shaped water flow loop. A third cooling water channel assembly 330 is provided inside the fixed platform 300, and four water guide pipes 340 are installed on the top surface of the fixed platform 300. One end of the water pipe 340 is connected to the third cooling water channel. The other end of the water pipe 340 passes through the pressure cover 220 and the outer frame 210 in sequence and extends upward. It is connected to the water pump unit through the first cooling water channel group and the second cooling water channel group 131 to form a cooling water circuit. Four sensor mounting slots are provided on the inner wall of the top of the pressure cover 220. Each sensor mounting slot is equipped with a pressure sensor 610. The pressure sensors 610 are distributed in a rectangular array and are close to each other with the water pipe 340. Four elastic rubber rings 350 are installed between the top surface of the fixed platform 300 and the pressure cover 220. The position of each elastic rubber ring 350 corresponds to the position of a set of sensor mounting slots. One end of the pressure sensor 610 and the water pipe 340 are located inside the elastic rubber ring 350. A first heat dissipation hole 320 is provided through the top and bottom surfaces of the fixed platform 300. The first heat dissipation hole 320 is located above the heating coil 260. A first mounting slot 222 is provided on the outer side of the top of the pressure cover 220. The bottom of the first mounting groove 222 is provided with a second heat dissipation hole 223. The temperature sensor 600 is installed in the first mounting groove 222. The first heat dissipation hole 320 is connected to the second heat dissipation hole 223. A first sealing ring 224 is installed around the bottom of the first mounting groove 222. The second heat dissipation holes 223 are all located in the first sealing ring 224. The bottom of the temperature sensor 600 is in close contact with the first sealing ring 224. The pressure sensor 610 and the temperature sensor 600 are electrically connected to the control unit 170.

[0049] More specifically, the drive unit 500 includes a drive motor 510, a drive screw 520, and a sliding sleeve seat 530. The drive motor 510 is mounted on the bottom of the outer frame 210 via a motor bracket 540, and the output shaft of the drive motor 510 is coaxially and fixedly connected to the drive screw 520. The lifting frame assembly 800 includes four push rods 810 and a push plate 820. The push plate 820 is fixedly connected to the middle of the push rods 810 and is perpendicular to each other. Four guide rails 860 are installed on the side of the outer frame 210. The guide rails 860 are vertically arranged and parallel to the drive screw 520. A slider 870 is provided on the side of the push plate 820. The slider 870 is slidably connected to the guide rails 860. The push rods 810 and the drive screw 520 are connected to the drive screw 520. The moving lead screws are parallel to each other. The sliding sleeve seat 530 is fixedly connected to the lower end of the push rod 810 and matches the drive lead screw 520. The moving platform 400 is fixedly connected to the top end of the push rod 810. A guide sleeve 830 is installed on the sealing plate 230. The guide sleeve 830 is slidably sleeved on the push rod 810. A second sealing ring 840 is provided between the guide sleeve 830 and the push rod 810. The elastic element 850 is a cylindrical spring. The two ends of the elastic element 850 are connected between the push plate 820 and the sealing plate 230. The elastic element 850 enables the sealing plate 230 to float elastically along the push rod 810. A third sealing ring 270 is provided on the top surface of the sealing plate 230. The position of the third sealing ring 270 corresponds to the position of the cover opening 221.

[0050] Additionally, a third clearance opening 229 is provided on the side of the pressure cover 220 facing away from the operating port 120. Two parallel first guide blocks 700 are installed on the outer wall, and the third clearance opening 229 is located between the two parallel first guide blocks 700. The length direction of the first guide blocks 700 is vertically arranged. A first adjusting plate 710 is provided between the two first guide blocks 700. The two sides of the first adjusting plate 710 are attached to the sides of the first guide blocks. The first adjusting plate 710 has a first elongated hole 711 and a first clearance opening 712. The first elongated hole 711 is aligned with the direction of the first guide block 700. An adjusting bolt 770 is installed on the side of the pressure cover 220 facing away from the operating port 120. The middle of the adjusting bolt 770 can... A release spring is fitted onto the adjusting bolt 770, which passes through the first elongated hole 711. One end of the release spring abuts against the nut end of the adjusting bolt 770, and the other end abuts against the first adjusting plate 710. Two parallel second guide blocks 720 are installed on the first adjusting plate 710. The second guide blocks 720 are perpendicular to the first guide blocks 700 and arranged laterally. A second adjusting plate 730 is installed between the two second guide blocks 720. The two sides of the second adjusting plate 730 fit against the sides of the second guide blocks 720. The second adjusting plate 730 has a second elongated hole 731 and a second clearance opening 732. The second elongated hole 731 is aligned with the direction of the second guide block 720. Two clamps are installed at the second clearance opening 732. The terminals of the heating coil 260 can pass sequentially through the third clearance port 229, the first clearance port 712, and the second clearance port 732 and be clamped and fixed by the two clamping blocks 740. A pull rod 780 is installed on the first adjusting plate 710. The end of the pull rod 780 can pass through the second elongated hole 731 and the clamping block 740 and is fitted with a nut 790. A release spring is fitted on the pull rod 780. One end of the release spring abuts against the nut 790, and the other end abuts against the second adjusting plate 730 and the clamping block 740. A first threaded seat is installed on the side of the pressure cover 220 facing away from the operating port 120. The middle part of the first adjusting screw 750 is threaded to the first threaded seat and rotatably connected to the second guide block. When the first adjusting screw 750 is in the middle, the threaded end of the first threaded seat is rotatably connected to the second guide block. When the adjusting screw 750 rotates, it can drive the first adjusting plate 710 to move along the first guide block 700, thereby realizing the vertical adjustment of the heating coil 260; a second threaded seat is installed on the first adjusting plate 710, and a rotating connecting seat is installed on the second adjusting plate 730. The middle part of the second adjusting screw 760 is threadedly connected to the second threaded seat, and the end of the screw is rotatably connected to the rotating connecting seat. When the second adjusting screw 760 rotates, it can drive the second adjusting plate 730 to move along the second guide block 720, thereby realizing the horizontal adjustment of the heating coil 260; sealing gaskets are installed between the first adjusting plate 710 and the pressure cover 220, between the second adjusting plate 730 and the first adjusting plate 710, and between the clamping block and the second adjusting plate 730.

[0051] Next, the working principle of a precious metal welding device in this embodiment will be described in detail so that those skilled in the art can better understand this utility model:

[0052] In use, firstly, the control unit 170 presets parameters such as pressure value, pressure time, and heating temperature for each welding chamber 200. Then, the workpiece is installed on the lower mold 410, the emergency stop button 160 is released, and the closing button is pressed. Afterward, the drive motor 510 causes the drive screw 520 to rotate, thereby driving the lifting frame assembly 800, the moving platform 400, and the sealing plate 230 to rise simultaneously along the guide rail 860. When it rises to a certain height, the sealing plate 230 first contacts the bottom of the pressure cover 220 to seal the pressure cover 220. At this time, the lifting frame assembly 800 pauses its lifting. First, the vacuum pump is turned on to evacuate the inside of the pressure cover 220 through the vacuum pipe 250. Then, the air inlet pump is turned on to fill the pressure cover 220 with protective gas from the external air tank. The high-frequency heating unit 110 is turned on to heat the heating coil 260. At this time, the drive unit 500 continues to drive the moving platform 400 to rise slightly. At this time, the upper mold 310 and the lower mold 410 close and press down, causing the workpiece to be welded. During the welding process of bonding and maintaining pressure, pressure sensor 610 and temperature sensor 600 can detect real-time data within the pressure chamber 220 and provide feedback to the controller for real-time adjustments. At this time, the water pump unit turns on, injecting circulating cooling water into the first cooling water channel group 131, the second cooling water channel group 131, and the third cooling water channel group 330 to assist in cooling and temperature regulation. During the pressure-maintaining and heat-preserving welding process, the operator can cover the protective plate 140 and observe the images captured by the monitoring camera 228 through the second observation window 227 on the screen of the control unit 170. When the welding time reaches the preset time, the water pump unit increases the cooling water flow, causing the temperature inside the pressure chamber 220 to rapidly drop to a safe temperature. Then, the air extraction unit turns on, and the bypass valve in the air supply unit opens to allow outside air to enter. Finally, the operator presses the release button, causing the drive unit 500 to drive the lifting frame group 800 to descend, separating the upper mold 310 and the lower mold 410. The operator then disassembles the welded workpiece and loads the next workpiece. The design of two welding chambers 200 allows for simultaneous welding of different types of products, improving efficiency.

[0053] In summary, the precious metal welding equipment in this embodiment, by providing a pressure cover 220 and a sealing plate 230, can provide a sealed environment filled with protective gas when the upper mold 310 and lower mold 410 are closed for heating and welding. This ensures a constant welding temperature and prevents oxidation. Furthermore, the sealing plate 230 is floatingly and elastically connected to the lifting frame assembly 800. When the pressure cover 220 and the sealing plate 230 are closed to maintain pressure, the pressure value when the upper mold 310 and lower mold 410 are closed can also be precisely adjusted by the drive unit 500. This allows for precise adjustment of the pressure value, preventing overpressure and underpressure, and improving welding accuracy and work efficiency.

[0054] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the present invention to the precise forms disclosed, and it is obvious that many changes and variations can be made based on the above teachings. Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. The purpose of selecting and describing exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art, after reading this specification, can make modifications, substitutions, variations, and various choices and changes to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, variations, and choices and changes are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A noble metal welding device, comprising a main machine, wherein a plurality of independent welding cabins are arranged in the main machine, a fixed platform and a movable platform are arranged in the welding cabin, an upper die and a lower die are respectively arranged on the fixed platform and the movable platform, and the upper die and the lower die are matched with each other, characterized in that: the welding cabin is provided with an outer frame, a pressure cover and a sealing plate are arranged in the outer frame, a cover opening is arranged at the bottom of the pressure cover, the fixed platform and the upper die are arranged in the pressure cover, an air inlet pipe and an air outlet pipe are arranged at the top of the pressure cover, a heating ring is further arranged in the pressure cover, and the heating ring is sleeved on the periphery of the upper die; a high-frequency heating unit, a driving unit, a water pump unit, an air supply unit and an air exhaust unit are further arranged in the main machine; the air supply unit and the air exhaust unit are connected with the air inlet pipe and the air outlet pipe respectively; the high-frequency heating unit is electrically connected with the heating ring; an output end of the driving unit is provided with a lifting frame group, the top of the lifting frame group is fixedly connected with the movable platform, the sealing plate is elastically connected with the lifting frame group through elastic members, when the driving unit drives the lifting frame group to move close to the fixed platform, the sealing plate can first contact the bottom of the pressure cover and seal the cover opening, and then the movable platform continues to move close to the fixed platform. A operation opening is arranged on the front of the main machine, a workbench is arranged below the operation opening, a reversible protection plate is arranged above the operation opening, independent operation buttons and emergency stop buttons are arranged on the side of each welding cabin, when the protection plate is turned down, the upper area of the pressure cover can be shielded, and the operation buttons and the emergency stop buttons are exposed outside; a control unit is arranged outside the main machine, the control unit is connected with the main machine through a rotating arm assembly; a baffle is arranged on the side of the sealing plate facing the operation opening.

2. The noble metal welding apparatus of claim 1, wherein A first cooling water channel group is arranged in the pressure cover, a second cooling water channel group is arranged in the workbench, and the first cooling water channel group and the second cooling water channel group are connected with the water pump unit simultaneously.

3. The noble metal welding apparatus of claim 2, wherein A temperature sensor and a pressure sensor are further arranged, the fixed platform is connected with the inner wall of the top of the pressure cover through bolts, the pressure sensor is arranged between the top surface of the fixed platform and the pressure cover, a first heat dissipation hole is arranged through the top surface and the bottom surface of the fixed platform, the first heat dissipation hole is arranged above the heating ring, a first mounting groove is arranged at the top of the pressure cover, a second heat dissipation hole is arranged at the bottom of the first mounting groove, the temperature sensor is arranged in the first mounting groove, and the first heat dissipation hole is connected with the second heat dissipation hole; the pressure sensor and the temperature sensor are electrically connected with the control unit.

4. The noble metal welding apparatus of claim 2, wherein, A third cooling water channel group is arranged in the fixed platform, and the third cooling water channel group is connected with the water pump unit.

5. The noble metal welding apparatus of claim 4, wherein, ​ 6. The noble metal welding apparatus of claim 5, wherein, The top surface of the fixed platform is provided with two or more water guide pipes, one end of the water guide pipe is communicated with the third cooling water channel, the other end of the water guide pipe sequentially penetrates the pressure cover and the outer frame body and extends upward, an elastic rubber ring is arranged between the top surface of the fixed platform and the pressure cover, the number of the elastic rubber ring and the number of the pressure sensor are consistent with the number of the water guide pipe, and the pressure sensor and the one end of the water guide pipe corresponding to each other are located in the elastic rubber ring.

7. The noble metal welding apparatus of claim 4, wherein The periphery of the bottom of the first mounting groove is provided with a first sealing ring, the second heat dissipation holes are located in the first sealing ring, and the bottom of the temperature sensor is tightly attached to the first sealing ring.

8. The noble metal welding apparatus of claim 2, wherein, A first observation window is arranged on the side of the pressure cover facing the operation opening, and a pressure gauge is arranged on the first observation window, a second observation window is arranged on the side of the pressure cover, and a monitoring camera is arranged on the second observation window and electrically connected with the control unit.

9. The noble metal welding apparatus of claim 1, wherein, The outer side of the pressure cover is provided with two first guide blocks parallel to each other, a first adjusting plate is arranged between the two first guide blocks, a first long hole and a first gap are arranged on the first adjusting plate, the first long hole is consistent with the direction of the first guide block, two second guide blocks parallel to each other are arranged on the first adjusting plate, the second guide blocks are perpendicular to the first guide blocks, a second adjusting plate is arranged between the two second guide blocks, a second long hole and a second gap are arranged on the second adjusting plate, the second long hole is consistent with the direction of the second guide block, and a clamping block is arranged at the second gap; a third gap is arranged on the side of the pressure cover, the wiring end of the heating ring can sequentially penetrate the third gap, the first gap and the second gap and be clamped and fixed by the clamping block; a first adjusting screw is arranged between the pressure cover and the first adjusting plate, the first adjusting screw can drive the first adjusting plate to move along the first guide block; a second adjusting screw is arranged between the first adjusting plate and the second adjusting plate, the second adjusting screw can drive the second adjusting plate to move along the second guide block, and sealing gaskets are arranged between the first adjusting plate and the pressure cover, between the second adjusting plate and the first adjusting plate and between the clamping block and the second adjusting plate.

10. The noble metal welding apparatus of claim 1, wherein, The driving unit comprises a driving motor, a driving screw and a sliding sleeve seat, the driving motor is installed on the bottom of the outer frame body through a motor support, and an output shaft of the driving motor is coaxially fixedly connected with the driving screw; the lifting frame group comprises a plurality of push rods and a push plate, the push plate is fixedly connected with the middle part of the push rod and is perpendicular to each other, the push rod is parallel to the driving screw, the sliding sleeve seat is fixedly connected with the lower end of the push rod and is matched with the driving screw, the moving platform is fixedly connected with the top end of the push rod, a guide sleeve is installed on the sealing plate, the guide sleeve is slidably sleeved on the push rod, a second sealing ring is arranged between the guide sleeve and the push rod, the elastic member is connected between the push plate and the sealing plate so that the sealing plate can elastically float along the push rod, and a third sealing ring is arranged on the top surface of the sealing plate.

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