Precious metal welding equipment

Abstract

The invention 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] The present invention belongs to the field of precious metal processing equipment, and particularly relates to a precious metal welding equipment. Background Art

[0002] The welding of two-color precious metals belongs to a welding process with relatively high technical requirements in precious metal processing, which refers to the combination of two different precious metals (such as gold and platinum, silver and palladium, etc.). The existing welding methods for two-color precious metals are usually laser welding, flame welding, and ultrasonic welding. Among them, although laser welding has high precision, the equipment cost is high, and the reflectivity of precious metals to laser is high, resulting in low energy absorption rate of laser. The heat conduction of precious metals is fast, making it difficult to concentrate heat. Flame welding requires the use of a soldering flux and is only suitable for the processing of thick parts. The weld seam effect after welding is not good and oxidation needs to be prevented. Ultrasonic welding is such that due to the relatively soft material properties of precious metals, the material at the weld seam is prone to deformation after high-frequency vibration, affecting the appearance, and the fast heat conduction also easily causes difficulty in concentrating heat, resulting in insufficient temperature. In view of the above disadvantages of the welding processes, there is an urgent need for a new welding equipment that can solve the problems of fast heat conduction, difficult heat concentration, easy oxidation, and poor weld seam effect and difficult quality control when precious metals are welded by traditional methods.

[0003] In the patent document with the application number "CN2020208629332", a precious metal diffusion welding machine is disclosed, which belongs to the field of metal processing equipment. It includes a control box, the control box is provided 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 arranged on the top of the control box, the cylinder shaft of the locking cylinder is fixedly connected with a lifting plate, the lifting cylinder is movably connected with the lifting plate, a guide post is fixedly connected to the lifting plate, the guide post is slidably connected with the guide rail, a top cover is fixedly connected above the guide post, an upper quartz clamp seat is fixedly connected below the top cover, the welding chamber includes a diffusion chamber, the diffusion chamber is connected with the vacuum pressurization system, an electric heating coil is arranged on the diffusion chamber, a graphite crucible and a lower quartz clamp seat are arranged inside the diffusion chamber, the lower quartz clamp seat is fixed on a connecting rod, and the connecting rod passes through the welding chamber and is fixedly connected with the cylinder shaft of the lifting cylinder. Although this welding device can solve the problems of easy oxidation and difficult heat concentration during precious metal welding, since this device uses a cylinder drive, and the upper and lower quartz clamp seats are both rigidly connected to the top cover and the diffusion chamber, the accuracy of pressure control and the air pressure stability in the pressed state cannot be guaranteed, thus affecting the processing quality.

[0004] The disclosure of the above background art content is only for assisting in understanding the inventive concept and technical solution of the present invention, and it does not necessarily belong to the prior art of this patent application. Without clear evidence indicating that the above content was publicly available on the filing date of this patent application, the above background art should not be used to evaluate the novelty and inventiveness of this application. Summary of the Invention

[0005] The object of the present invention is to provide a precious metal welding device, so as to overcome the defects that when welding by the existing two-color precious metal welding process, the heat of the welding machine is difficult to concentrate, the welding material is easily oxidized, and the quality of the weld seam cannot be guaranteed.

[0006] To achieve the above object, the present invention provides a precious metal welding device, including a main body machine platform. There are several independent welding cabins in the main body machine platform. A fixed platform and a moving platform are provided in the welding cabin. An upper die and a lower die are respectively installed on the fixed platform and the moving platform, and the upper die and the lower die match each other; the welding cabin is provided with an outer frame body. A pressure cover and a sealing plate are provided in the outer frame body. A cover opening is formed at the bottom of the pressure cover. The fixed platform and the upper die are located inside the pressure cover. An air inlet pipe and an air extraction pipe are provided at the top of the pressure cover. A heating coil is also provided inside the pressure cover, and the heating coil is sleeved around 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 extraction unit are also provided in the main body machine platform; 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 driving unit is provided with a lifting frame group, the top of the lifting frame group is fixedly connected to the moving platform, and the sealing plate is elastically connected to the lifting frame group through an elastic member. When the driving unit drives the lifting frame group 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, an operation opening is formed on the front surface of the main body machine platform. A workbench is provided below the operation opening, and a flip-up protective plate is provided above the operation opening. Independent operation buttons and emergency stop buttons are provided on the side of each welding cabin. When the protective plate is flipped downwards, the upper area of the pressure cover can be blocked, and the operation buttons and the emergency stop buttons are exposed outside; a control unit is provided outside the main body machine platform, and the control unit is connected to the main body machine platform through a swivel arm assembly; a baffle is provided on the side of the sealing plate facing the operation opening.

[0008] Preferably, in the above technical solution, a first cooling water channel group is provided inside the pressure cover, 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, in the above technical solution, it 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 opened through the top surface and the bottom surface of the fixed platform, and the first heat dissipation hole is located above the heating coil. A first installation groove is opened at the top of the pressure cover, and a second heat dissipation hole is opened at the bottom of the first installation groove. The temperature sensor is installed in the first installation groove, and the first heat dissipation hole is communicated with the second heat dissipation hole; the pressure sensor and the temperature sensor are electrically connected to the control unit.

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

[0011] Preferably, in the above technical solution, two or more water guide pipes are provided on the top surface of the fixed platform. One end of the water guide pipe is communicated with the third cooling water channel, and the other end of the water guide pipe sequentially passes through the pressure cover and the outer frame body and extends upward. An elastic rubber ring is provided between the top surface of the fixed platform and the pressure cover. The number of the elastic rubber rings and the number of the pressure sensors are consistent with the number of the water guide pipes, and one ends of the pressure sensors and the water guide pipes corresponding in position are both located within the elastic rubber ring.

[0012] Preferably, in the above technical solution, a first sealing ring is provided around the bottom of the first installation groove, the second heat dissipation holes are all located within the first sealing ring, and the bottom of the temperature sensor is closely attached to the first sealing ring.

[0013] Preferably, in the above technical solution, a first observation window is opened on one side of the pressure cover facing the operation port and a pressure gauge is installed. A second observation window is opened 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, two parallel first guide blocks are provided on the outer side of the pressure cover. A first adjusting plate is arranged between the two first guide blocks. A first long hole and a first relief opening are formed in the first adjusting plate. The first long hole is in the same direction as the first guide block. Two parallel second guide blocks are installed 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 relief opening are formed in the second adjusting plate. The second long hole is in the same direction as the second guide block. A clamping block is installed at the second relief opening. A third relief opening is formed in the side of the pressure cover. The wiring terminal of the heating coil can sequentially pass through the third relief opening, the first relief opening and the second relief opening and be clamped and fixed by the clamping block. A first adjusting screw is provided 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 provided 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. 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 driving unit includes a driving motor, a driving lead screw and a sliding sleeve seat. The driving motor is installed at the bottom of the outer frame body through a motor bracket. The output shaft of the driving motor is coaxially and fixedly connected to the driving lead screw. The lifting frame group includes a plurality of push rods and a push plate. The push plate is fixedly connected to the middle of the push rods and is perpendicular to each other. The push rods are parallel to the driving lead screw. The sliding sleeve seat is fixedly connected to the lower end of the push rod and is matched with the driving lead screw. The moving platform is fixedly connected to 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 provided 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. A third sealing ring is provided on the top surface of the sealing plate.

[0016] Compared with the existing technology, the present invention has the following beneficial effects:

[0017] 1. In the precious metal welding equipment of the present invention, by providing a pressure cover and a sealing plate, a sealed environment filled with protective gas can be provided when the upper die and the lower die are closed for heating and welding, so as to ensure the constancy of the temperature during welding and prevent oxidation. Moreover, the sealing plate is elastically connected to the lifting frame group in a floating manner. When the pressure cover and the sealing plate are closed for pressure holding, the pressure value during the die closing of the upper die and the lower die can also be precisely adjusted by the driving unit, thereby playing a role in precisely adjusting the pressure value, preventing overpressure and underpressure, and improving the welding accuracy and operation effect.

[0018] 2. In the present invention, multiple welding chambers are provided. By replacing the types of the upper die and the lower die, it is possible to process single-type workpieces or different-type workpieces simultaneously, thereby improving the production rhythm. An operation port facilitates the operator to perform loading and unloading operations and monitor the working conditions in multiple welding chambers at the same time; the control unit is arranged outside the main machine table through a rotating arm assembly, which is convenient for the operator to operate and can also prevent the high temperature inside the main machine table from interfering with the electronic devices in the control unit and affecting the stability.

[0019] 3. In the present invention, a first cooling water channel group and a second cooling water channel group are respectively arranged in the pressure cover and the fixed platform, which can not only play a role in dissipating heat from the pressure cover to protect external personnel, temperature sensors and pressure sensors, but also control the flow rate in each cooling water channel through a water pump unit. When the temperature in the welding chamber is too high, it can quickly cool down so that the temperature in the chamber reaches balance and stability; a third cooling water channel is arranged inside the workbench to cool the workbench and play a role in protecting the operator during loading and unloading.

[0020] 4. In the present invention, an elastic rubber ring is arranged on the outer periphery of one end of the pressure sensor and the water conduit. This elastic rubber ring can not only play a role in sealing and pressure holding and preventing interference to the pressure sensor, but also realize the soft connection between the fixed platform and the pressure cover, with a certain floating amount, so as to facilitate the pressure sensor to measure and feedback the pressure value, thereby achieving the effect of precisely adjusting the pressure.

[0021] 5. In the present invention, a first observation window and a second observation window are opened on the side of the pressure cover. A monitoring camera is arranged outside the second observation window, and the image can be transmitted to the control unit. Thus, when the protection plate blocks the first observation port, it is also convenient for the operator to observe the state of the workpiece in the control unit in real time. Moreover, the monitoring camera is located outside the welding chamber and can prevent overheating from affecting its service life.

[0022] 6. The heating coil in the present invention can adjust its position in the vertical and horizontal directions through the first adjusting screw rod, the second adjusting screw rod, the first adjusting plate and the second adjusting plate, and is convenient for installation and disassembly through the clamping plate, so that it can heat the tooling workpieces with different sizes and positions, and has more flexible adaptability; in addition, the temperature sensor is installed above the heating coil, and the heat can rise directly to the detection surface of the temperature sensor, so that it can more accurately measure the real temperature around the welded workpiece.

[0023] 7. In the present invention, the driving unit drives the lifting frame group to lift by the driving lead screw and the sliding sleeve seat, which not only has higher adjustment accuracy, but also can be self-locked to prevent pressure loss; the push rod can not only push and support the moving platform, but also cooperate with the guide sleeve to play a guiding role when the sealing plate moves, and the design is more compact and delicate, reducing the equipment cost. Brief Description of the Drawings

[0024] Figure 1 It is a structural diagram of the precious metal welding equipment in the present invention.

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

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

[0027] Figure 4 It is a partial sectional view of the pressure cover.

[0028] Figure 5 It 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 die.

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

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

[0032] Main reference numerals description:

[0033] 100 - main machine table, 120 - operation port, 130 - workbench, 131 - second cooling water channel group, 140 - protection plate, 150 - operation button, 160 - emergency stop button, 170 - control unit, 180 - rotating arm assembly;

[0034] 200 - Welding chamber, 210 - Outer frame body, 220 - Pressure cover, 221 - Cover opening, 222 - First installation groove, 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 relief opening, 230 - Sealing plate, 231 - Baffle, 240 - Air inlet pipe, 250 - Exhaust pipe, 260 - Heating coil, 270 - Third sealing ring, 280 - First cooling water channel group;

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

[0036] 400 - Moving platform, 410 - Lower die;

[0037] 500 - Driving unit, 510 - Driving motor, 520 - Driving lead screw, 530 - Slide sleeve seat, 540 - Motor bracket;

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

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

[0040] 800 - Lifting frame group, 810 - Push rod, 820 - Push plate, 830 - Guide sleeve, 840 - Second sealing ring, 850 - Elastic member, 860 - Guide rail, 870 - Slide block. Detailed implementation

[0041] 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.

[0042] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "top portion", "bottom portion", "top surface", "bottom surface", "inner", "outer", "inner side", "outer side", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0043] In the description of the present invention, the meaning of "a number of" is one or more, the meaning of "a plurality of" is two or more. Understandings such as "greater than", "less than", "exceeding", etc. do not include the present number, and understandings such as "above", "below", "within", etc. include the present number. If the terms "first", "second", "third" are described, they are only for the purpose of description and distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0044] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected to", "set" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. The embodiments of the present invention will be described below according to its overall structure.

[0045] Such as Figures 1 to 8As shown, the precious metal welding equipment in this embodiment includes: a main machine 100, an operation port 120, a workbench 130, a second cooling water channel group 131, a protective plate 140, an operation button 150, an emergency stop button 160, a control unit 170, a rotating arm assembly 180, a welding cabin 200, an outer frame 210, a pressure cover 220, a cover port 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 yielding port 229, a sealing plate 230, an air inlet pipe 240, an exhaust pipe 250, a heating coil 260, a third sealing ring 270, a fixed platform 300, an upper mold 310, a first heat dissipation hole 320, a third cooling The cooling channel assembly 330, the water pipe 340, the elastic rubber ring 350, the moving platform 400, the lower mold 410, the driving unit 500, the driving motor 510, the driving screw 520, the sliding sleeve seat 530, the temperature sensor 600, the pressure sensor 610, the first guide block 700, the first adjusting plate 710, the first long hole 711, the first clearance opening 712, the second guide block 720, the second adjusting plate 730, the second long hole 731, the second clearance opening 732, the clamping block 740, the first adjusting screw 750, the second adjusting screw 760, the adjusting bolt 770, the pull rod 780, the nut 790, the anti-loosening spring 791, the lifting frame assembly 800, the push rod 810, the push plate 820, the guide sleeve 830, the second sealing ring 840, and the elastic member 850.

[0046] An outer shell plate is provided on the outside of the main machine platform 100. An operation port 120 is opened on the front of the main machine platform 100. A workbench 130 extending outward is installed below the operation port 120. Two or more independent welding chambers 200, a high-frequency heating unit, a driving unit 500, a water pump unit, an air supply unit, and an air extraction unit are installed in the main machine platform. The welding chambers 200 are separated from each other and other units by partitions, and the number of high-frequency heating units corresponds to the number of welding chambers 200. Independent operation buttons 150 and emergency stop buttons 160 are installed on the side of each welding chamber 200. The operation buttons 150 include a closing button and a releasing button; The welding chamber 200 is composed of an outer frame 210, a pressure cover 220, and a sealing plate 230. The outer frame 210 is a rectangular frame structure and is fixedly connected to the main machine platform. The pressure cover 220 and the sealing plate 230 are arranged inside the outer frame 210. A cover opening 221 is opened at the bottom of the pressure cover 220, and the top is fixedly connected to the top of the outer frame 210. A fixed platform 300 and an upper die 310 are located inside 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. The upper die 310 is detachably installed at the bottom of the fixed platform 300; An air inlet pipe 240 and an air extraction pipe 250 communicating with the inside thereof 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 air supply unit and the air extraction unit are respectively connected to the air inlet pipe 240 and the air extraction pipe 250. The air supply unit includes an air supply pump, an electric control valve, and is connected to an external independent protective gas tank. Here, the protective gas tank can be selected and replaced according to the type of precious metal to be welded, such as argon, helium, or nitrogen. The air extraction unit includes an air extraction pump, an electric control valve, and an exhaust gas tank; A heating coil 260 is installed inside the pressure cover 220 and sleeved around the periphery of the upper die 310. The heating coil 260 is a spiral structure. The high-frequency heating unit 110 is electrically connected to the wiring terminal of the heating coil 260; The driving unit 500 is installed below the outer frame 210. The lifting frame group 800 is connected to the output end of the driving unit 500. The driving unit 500 can drive the lifting frame to approach the fixed platform 300. The top of the lifting frame group 800 is fixedly connected to the moving platform 400. The sealing plate 230 is elastically connected to the lifting frame group 800 through an elastic member 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 operation port 120. When the driving unit 500 drives the lifting frame group 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 die 310 and the lower die 410 are buckled together;The top edge of the protective plate 140 is hinged above the operation opening 120 so that the bottom of the protective plate 140 can be turned upward to open. When the protective plate 140 is closed, the area above the pressure cover 220 can be blocked. The installation position of the operation button 150 is lower than the bottom edge of the protective plate 140 and is exposed to the outside to facilitate the operator's operation. The control unit 170 is connected to the main machine table 100 through the swing arm assembly 180. The operator can pull the control unit 170 closer to the operation opening 120 during operation through the swing 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 opening 120 and a pressure gauge 226 is installed. 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 picture presented by the monitoring camera 228 can be displayed on the touch screen of the control unit 170.

[0048] In addition, a first cooling water channel group 280 is provided on the inner walls of the side and top of the pressure cover 220. The first cooling water channel group 280 surrounds the first observation window 225 and the second observation window 227. A second cooling water channel group 131 is provided in the workbench 130. The ends of the second cooling water channel group 131 are interconnected by hoses to form an S-shaped water flow circuit. A third cooling water channel group 330 is provided in the fixed platform 300. Four water guide pipes 340 are installed on the top surface of the fixed platform 300. One end of each water guide pipe 340 is connected to the third cooling water channel. The other end of the water guide pipe 340 sequentially passes through the pressure cover 220 and the outer frame 210 and extends upward, and is connected to the first cooling water channel group and the second cooling water channel group 131 and is simultaneously connected to the water pump unit to form a cooling water circuit. Four sensor installation grooves are opened on the inner wall of the top of the pressure cover 220. A pressure sensor 610 is installed in each sensor installation groove. The pressure sensors 610 are distributed in a rectangular array and are respectively close to the water guide pipes 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 group of sensor installation grooves respectively. One end of the pressure sensor 610 and the water guide pipe 340 are both located within the elastic rubber ring 350. A first heat dissipation hole 320 is opened 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 installation groove 222 is opened on the outer side of the top of the pressure cover 220. A second heat dissipation hole 223 is opened at the bottom of the first installation groove 222. The temperature sensor 600 is installed in the first installation 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 installation groove 222. The second heat dissipation holes 223 are all located within the first sealing ring 224. The bottom of the temperature sensor 600 is in close contact with the first sealing ring 224. The pressure sensors 610 and the temperature sensor 600 are electrically connected to the control unit 170.

[0049] More specifically, the driving unit 500 includes a driving motor 510, a driving lead screw 520, and a sliding sleeve seat 530. The driving motor 510 is installed at the bottom of the outer frame 210 through a motor bracket 540, and the output shaft of the driving motor 510 is fixedly connected coaxially with the driving lead screw 520; the lifting frame group 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 arranged vertically and are parallel to the driving lead screw 520. A slider 870 is arranged on the side of the push plate 820. The slider 870 is slidably connected to the guide rails 860. The push rods 810 are parallel to the driving lead screw. The sliding sleeve seat 530 is fixedly connected to the lower end of the push rods 810 and is matched with the driving lead screw 520. The moving platform 400 is fixedly connected to the top end of the push rods 810. A guide sleeve 830 is installed on the sealing plate 230. The guide sleeve 830 is slidably sleeved on the push rods 810. A second sealing ring 840 is arranged between the guide sleeve 830 and the push rods 810. The elastic member 850 is a cylindrical spring. Both ends of the elastic member 850 are connected between the push plate 820 and the sealing plate 230. The elastic member 850 can make the sealing plate 230 elastically float along the push rods 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] In addition, a third relief opening 229 is formed on the side of the pressure cover 220 facing away from the operation port 120. Two parallel first guide blocks 700 are installed on the outer wall. The third relief 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 arranged between the two first guide blocks 700. The two sides of the first adjusting plate 710 are attached to the side parts of the first guide blocks. The first adjusting plate 710 is provided with a first long hole 711 and a first relief opening 712. The first long hole 711 is in the same direction as the first guide blocks 700. An adjusting bolt 770 is installed on the side of the pressure cover 220 facing away from the operation port 120. The middle part of the adjusting bolt 770 can pass through the first long hole 711. A relaxation spring is sleeved on the adjusting bolt 770. One end of the relaxation 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 are horizontally arranged. A second adjusting plate 730 is installed between the two second guide blocks 720. The two sides of the second adjusting plate 730 are attached to the side parts of the second guide blocks. The second adjusting plate 730 is provided with a second long hole 731 and a second relief opening 732. The second long hole 731 is in the same direction as the second guide blocks 720. Two clamping blocks 740 are installed at the second relief opening 732. The wiring end of the heating coil 260 can sequentially pass through the third relief opening 229, the first relief opening 712, and the second relief opening 732 and is 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 long hole 731 and the clamping block 740 and a nut 790 is installed. A relaxation spring is sleeved on the pull rod 780. One end of the relaxation 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 operation port 120. The middle part of the first adjusting screw 750 is threadedly connected to the first threaded seat and the end part is rotatably connected to the second guide block. When the first adjusting screw 750 rotates, it can drive the first adjusting plate 710 to move along the first guide blocks 700, so as to realize the vertical adjustment of the heating coil 260. A second threaded seat is installed on the first adjusting plate 710. A rotating connection 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 part is rotatably connected to the rotating connection seat. When the second adjusting screw 760 rotates, it can drive the second adjusting plate 730 to move along the second guide blocks 720, so as to realize 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 blocks 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 to enable those skilled in the art to better understand the present invention:

[0052] During use, first, the control unit 170 presets parameters such as pressure value, pressure time, heating temperature, etc. 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. After that, the driving motor 510 can rotate the driving lead screw 520, thereby driving the lifting frame group 800, the moving platform 400, and the sealing plate 230 to simultaneously lift upward 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 group 800 pauses to lift. First, the air extraction pump is turned on to evacuate the inside of the pressure cover 220 through the air extraction pipe 250. Then, the air inlet pump is turned on to fill the protective gas in the external gas tank into the pressure cover 220. The high-frequency heating unit 110 is turned on to heat up the heating coil 260. At this time, the driving unit 500 continues to drive the moving platform 400 to lift slightly. At this time, the upper mold 310 and the lower mold 410 are pressed together, so that the welded parts are attached and the pressure is maintained. The pressure sensor 610 and the temperature sensor 600 can detect the real-time data inside the pressure cover 220 and feedback it to the controller for real-time adjustment. At this time, the water pump unit is turned on to inject circulating cooling water into the first cooling water channel group, the second cooling water channel group 131, and the third cooling water channel group 330, so as to achieve the function of assisting in cooling and temperature adjustment. During the welding process of maintaining pressure and temperature, the operator can cover the protection plate 140 and observe the image 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, so that the temperature inside the pressure cover 220 quickly drops to a safe temperature. Then, the air extraction unit is turned on and the bypass valve in the air supply unit is opened to allow external air to enter. Finally, the operator presses the release button to make the driving unit 500 drive the lifting frame group 800 to descend, separate the upper mold 310 and the lower mold 410. The operator disassembles the welded workpiece and loads the next workpiece. The design of the two welding chambers 200 can be applied to the simultaneous welding of different types of products, thereby improving the efficiency.

[0053] To sum up, the precious metal welding device in this embodiment can provide a sealed environment filled with protective gas when the upper mold 310 and the lower mold 410 are combined for heating and welding by setting the pressure cover 220 and the sealing plate 230, so as to ensure the constancy of the temperature during welding and prevent oxidation. Moreover, the sealing plate 230 is elastically connected to the lifting frame group 800 in a floating manner. When the pressure cover 220 and the sealing plate 230 are combined to maintain pressure, the driving unit 500 can also precisely adjust the pressure value when the upper mold 310 and the lower mold 410 are closed, thereby playing the role of precisely adjusting the pressure value, preventing overpressure and underpressure, and improving the welding accuracy and operation effect.

[0054] The foregoing description of specific exemplary embodiments of the present invention is for purposes of illustration and exemplification. These descriptions are not intended to limit the present invention to the precise forms disclosed, and obviously, many changes and variations are possible in light of the above teachings. Although embodiments of the present invention have been shown and described, the specific embodiments are merely interpretations of the present invention and not limitations thereof. The specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical applications, so that those skilled in the art can, after reading this specification, make modifications, substitutions, variations, and various different selections and changes that do not make a creative contribution to the embodiments as needed, but as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A precious metal welding device, comprising a main machine platform, wherein the main machine platform is provided with a plurality of mutually independent welding cabins, wherein a fixed platform and a movable platform are provided in the welding cabin, wherein an upper die and a lower die are respectively mounted on the fixed platform and the movable platform, and the upper die and the lower die match each other; characterized in that: The welding cabin is provided with an outer frame, a pressure hood and a sealing plate are provided in the outer frame, a hood opening is provided at the bottom of the pressure hood, the fixed platform and the upper mold are located in the pressure hood, an air inlet pipe and an air exhaust pipe are provided at the top of the pressure hood, a heating ring is also provided in the pressure hood, and the heating ring is sleeved on the periphery of the upper mold; a high-frequency heating unit, a driving unit, a water pump unit, an air supply unit and an air exhaust unit are also provided in the main machine; the air supply unit and the air exhaust unit are respectively connected with the air inlet pipe and the air exhaust pipe; the high-frequency heating unit is electrically connected with the heating ring; a lifting frame group is provided at the output end of the driving unit, the top of the lifting frame group is fixedly connected with the moving platform, the sealing plate is elastically connected with the lifting frame group through an elastic member, and when the driving unit drives the lifting frame group to approach the fixed platform, the sealing plate can first contact with the bottom of the pressure hood and seal the hood opening, and then the moving platform continues to approach the fixed platform.

2. The precious metal welding equipment according to claim 1, characterized in that: An operation port is provided on the front of the main machine, a workbench is provided below the operation port, a flip-over protective plate is provided above the operation port, and independent operation buttons and emergency stop buttons are provided on the sides of each welding cabin. When the protective plate is flipped downward, the upper area of ​​the pressure cover can be shielded, and the operation buttons and the emergency stop button can be exposed to the outside; a control unit is provided on the outside of the main machine, and the control unit is connected to the main machine through a swivel arm assembly; a baffle is provided on the side of the sealing plate facing the operation port.

3. The precious metal welding equipment according to claim 2, characterized in that: A first cooling water channel group is arranged in the pressure cover, and a second cooling water channel group is arranged in the workbench. The first cooling water channel group and the second cooling water channel group are connected to the water pump unit at the same time.

4. The precious metal welding equipment according to claim 2, characterized in that: It also 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 opened through the top and bottom surfaces of the fixed platform. The first heat dissipation hole is located above the heating ring. A first mounting groove is opened on the top of the pressure cover. A second heat dissipation hole is opened at the bottom of the first mounting groove. The temperature sensor is installed in the first mounting groove. The first heat dissipation hole is connected to the second heat dissipation hole. The pressure sensor and the temperature sensor are electrically connected to the control unit.

5. The precious metal welding equipment according to claim 4, characterized in that: A third cooling water channel group is provided in the fixed platform, and the third cooling water channel group is communicated with the water pump unit.

6. The precious metal welding equipment according to claim 5, characterized in that: The top surface of the fixed platform is provided with more than two water pipes, one end of the water pipe is connected with the third cooling water channel, and the other end of the water pipe passes through the pressure cover and the outer frame in sequence and extends upward, and an elastic rubber ring is provided between the top surface of the fixed platform and the pressure cover, the number of the elastic rubber rings and the number of the pressure sensors are consistent with the number of the water pipes, and the pressure sensor and one end of the water pipe, which are positioned corresponding to each other, are both located in the elastic rubber ring.

7. The precious metal welding equipment according to claim 4, characterized in that: A first sealing ring is arranged around the bottom of the first installation groove, the second heat dissipation holes are all located in the first sealing ring, and the bottom of the temperature sensor is in close contact with the first sealing ring.

8. The precious metal welding equipment according to claim 2, characterized in that: A first observation window and a pressure gauge are provided on a side of the pressure hood facing the operating port, a second observation window is provided on the side of the pressure hood, a monitoring camera is installed at the second observation window, and the monitoring camera is electrically connected to the control unit.

9. The precious metal welding equipment according to claim 1, characterized in that: The outer side of the pressure cover is provided with two first guide blocks parallel to each other, a first adjustment plate is provided between the two first guide blocks, a first long hole and a first clearance opening are provided on the first adjustment plate, the first long hole is in the same direction as the first guide block, two second guide blocks parallel to each other are installed on the first adjustment plate, the second guide block is perpendicular to the first guide block, a second adjustment plate is provided between the two second guide blocks, a second long hole and a second clearance opening are provided on the second adjustment plate, the second long hole is in the same direction as the second guide block, and a clamping block is installed at the second clearance opening; a third clearance opening is provided on the side of the pressure cover The connection terminal of the heating coil can pass through the third make way opening, the first make way opening and the second make way opening in sequence and be clamped and fixed by the clamping block; a first adjusting screw is provided between the pressure cover and the first adjusting plate, and the first adjusting screw 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, and the second adjusting screw 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.

10. The precious metal welding equipment according to claim 1, characterized in that: The driving unit includes a driving motor, a driving screw and a sliding sleeve seat, the driving motor is installed at the bottom of the outer frame through a motor bracket, and the output shaft of the driving motor is coaxially fixedly connected to the driving screw; the lifting frame group includes a plurality of push rods and push plates, the push plate is fixedly connected to the middle part of the push rod and is perpendicular to each other, the push rod and the driving screw are parallel to each other, the sliding sleeve seat is fixedly connected to the lower end of the push rod and matches the driving screw, the moving platform is fixedly connected to 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 provided between the guide sleeve and the push rod, the elastic member is connected between the push plate and the sealing plate to enable the sealing plate to elastically float along the push rod, and a third sealing ring is provided on the top surface of the sealing plate.

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