Material conveying system and vacuum reflow soldering furnace thereof

Abstract

The material conveying system comprises a multi-section type horizontal conveying mechanism used for horizontally conveying materials, and the multi-section type horizontal conveying mechanism comprises a feeding conveying table, a connection conveying table and a discharging conveying table which are arranged in sequence; the material lifting mechanism is arranged on one side of the multi-section horizontal conveying mechanism and used for lifting the materials from the connection conveying table or descending the materials to be placed on the connection conveying table; wherein the material lifting mechanism comprises a lifting assembly, a moving beam, a grabbing assembly used for grabbing materials and guide assemblies, the lifting assembly is in transmission connection with the moving beam, the moving beam can move in the height direction of the lifting assembly, the moving beam is fixedly connected with the grabbing assembly, and one end of the moving beam is in sliding connection with the corresponding guide assembly. According to the vacuum reflow soldering furnace, batch production and welding can be carried out, each furnace body cavity can operate independently, and production of different processes / different products can be achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of vacuum reflow soldering furnaces, and in particular relates to a material conveying system and a vacuum reflow soldering furnace thereof. Background Art

[0002] With the rapid development of new energy, smart grid, electric vehicles and other industries, the market demand for IGBT (insulated gate bipolar transistor) and other power devices has surged, and its packaging technology has become one of the key links restricting the development of the industry. At present, the domestic market is highly dependent on imported equipment, especially high-end placement machines and vacuum reflow ovens, which not only increases manufacturing costs, but also limits the independent controllability of the industrial chain.

[0003] A vacuum reflow oven is a device that performs a soldering process on semiconductor chips in a vacuum environment. The device uses a vacuum environment and a reducing process gas to protect the product and solder from oxidation, thereby improving soldering quality, improving the heat transfer performance of soldered devices, and thus improving the reliability of electronic devices.

[0004] The material conveying system is an important component of the vacuum reflow soldering furnace. When conveying workpieces, the existing material conveying device is generally driven by a chain conveyor device, and the workpieces need to be moved horizontally in sequence for processing. The current material conveying system does not have a mechanism that can transport materials in the height direction.

[0005] At the same time, the existing material conveying system cannot adjust its horizontal position, nor can it independently convey materials to multiple furnace chambers. Therefore, the application scenarios are relatively limited, and the existing material conveying system can no longer meet current production needs. Summary of the invention

[0006] In view of the above-mentioned problems existing in the prior art, the present invention provides a material conveying system and a vacuum reflow soldering furnace thereof. The vacuum reflow soldering furnace of the present invention is equipped with a material conveying system, which can significantly improve the production efficiency (UPH). It is a mass production tool for vacuum reflow soldering. As a fully automatic equipment, each furnace chamber can operate independently, and the production of different processes / different products can be realized.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions: A material conveying system, comprising: A multi-stage horizontal conveying mechanism for horizontally conveying materials, which comprises a feeding conveying platform, a connecting conveying platform and a discharging conveying platform arranged in sequence; A material lifting mechanism disposed on one side of the multi-stage horizontal conveying mechanism, the material lifting mechanism is used to lift the material from the docking conveying platform, or to lower the material and place it on the docking conveying platform; Among them, the material lifting mechanism includes a lifting component, a moving beam, a grabbing component for grabbing materials and a guide component. The lifting component is transmission-connected to the moving beam, the moving beam can move along the height direction of the lifting component, the moving beam is fixedly connected to the grabbing component, and one end of the moving beam is slidingly connected to one of the guide components.

[0008] Furthermore, the moving beam is horizontally arranged and the lifting assembly is connected to the middle part of the moving beam. There are two grabbing assemblies, which are symmetrically arranged on both sides of the lifting assembly. The grabbing assembly includes two pairs of oppositely arranged finger cylinders, and a space for grabbing materials is reserved between the two pairs of finger cylinders.

[0009] Further, the lifting assembly includes a linear module and a lifting basket fixed on the moving beam, a driving motor is installed at one end of the linear module, a top position sensor and a bottom position sensor are installed in the height direction of the linear module, and the top position sensor is located above the bottom position sensor; The lifting basket is fixed on one side of the moving direction of the moving beam, and the lifting basket is arranged along the length direction of the moving beam. The finger cylinders are fixed on the lifting basket, and the finger cylinders are arranged parallel to each other. The finger cylinders are also equipped with cylinder stroke sensors.

[0010] Furthermore, the guide assembly includes a guide shaft, a shaft mounting plate, a bearing mounting seat and a linear bearing. Both ends of the guide shaft are fixed to the shaft mounting plate. The guide shaft is installed with the linear bearing. The linear bearing is connected to the bearing mounting seat. The bearing mounting seat is installed at one end of the moving beam.

[0011] Furthermore, a supporting device is installed at the lower part of the feed conveyor platform, the docking conveyor platform and the discharging conveyor platform, and the supporting device is used to adjust the width position of the corresponding feed conveyor platform, the docking conveyor platform or the discharging conveyor platform. The supporting device includes a connecting beam, a slide bar, an adjustment block and a horizontal adjustment screw. The connecting beam has a slide groove along its length direction, and the slide bar is slidably arranged in the slide groove. The adjustment blocks are arranged on both sides of the slide bar, and the adjustment blocks are fixed on the connecting beam. Each adjustment block is threadedly connected to the horizontal adjustment screw, and one end of the horizontal adjustment screw is respectively abutted against one side of the slide bar.

[0012] Furthermore, the supporting device also includes a height adjustment component, which includes a height adjustment screw and a pad block. The height adjustment screw is threadedly connected to the slide bar, and the height adjustment screw is arranged perpendicular to the slide bar. The pad block abuts against the height adjustment screw, and the pad block is fixedly arranged at the bottom of the feed conveying platform, the docking conveying platform or the discharge conveying platform.

[0013] Furthermore, the feed conveyor platform, the docking conveyor platform and the discharging conveyor platform respectively include a conveyor belt motor, a conveyor belt structure and an intermediate plate, the conveyor belt structure is symmetrically arranged at both ends of the intermediate plate and is respectively fixed to both ends of the intermediate plate, the conveyor belt motor is installed on one side of one of the conveyor belt structures, the conveyor belt motor cooperates with the two conveyor belt structures in transmission, the intermediate plate is arranged corresponding to the supporting device, and the supporting device is arranged and installed at the lower part of the intermediate plate.

[0014] Furthermore, the feed conveyor platform is installed with two photoelectric sensors along the material conveying direction, the docking conveyor platform is installed with four photoelectric sensors along the material conveying direction, and the discharge conveyor platform is installed with two photoelectric sensors along the material conveying direction.

[0015] Furthermore, the feed conveyor platform, the docking conveyor platform and the discharge conveyor platform are connected in sequence by smooth strips, the smooth strips are arranged on the side of the conveyor belt structure, and the smooth strips are distributed along the length direction of the conveyor belt structure; the docking conveyor platform also includes at least one pair of blockers, the blockers are installed on one side of the middle plate, and the blockers are respectively distributed along the material conveying direction of the docking conveyor platform.

[0016] In addition, the present invention also requests protection for a vacuum reflow soldering furnace, comprising a frame, in which any one of the above-mentioned material conveying systems is installed, and at least one pair of furnace body chambers is installed in the frame along the height direction, and each pair of furnace body chambers is respectively arranged corresponding to the grabbing components of the material lifting mechanism.

[0017] Compared with the prior art, the beneficial effects of this solution are: 1. The vacuum reflow soldering furnace of the present invention is equipped with a material conveying system, which can be used for batch production welding. At least one pair of furnace body chambers are installed in the vacuum reflow soldering furnace, and each furnace body chamber can operate independently, which can significantly improve the production efficiency (UPH), and can realize the production of different processes / different products. The material lifting mechanism of the material conveying system includes a lifting component, a moving beam, a grabbing component and a guide component. By installing the guide component at both ends of the grabbing component, the moving beam moves up and down in a straight line under the guidance of the guide component, so that the height of the chip fixture can be maintained when conveying (materials). The lifting component is used to lift and lower the height of the moving beam. By setting the lifting component, the degree of automation of the material lifting mechanism is improved. The lifting component is installed along the height direction, and multiple pairs of furnace body chambers can be set along the height direction of the lifting component, thereby improving the overall space utilization of the vacuum reflow soldering furnace equipment; 2. The material conveying system includes a multi-stage horizontal conveying mechanism, which includes a feed conveyor, a docking conveyor and a discharge conveyor arranged in sequence. The material can pass through the feed conveyor, the docking conveyor and the discharge conveyor smoothly through the smooth strip, so that the material processing accuracy is higher and the generation of waste is reduced. In the feeding stage, it cooperates with the material lifting mechanism to deliver the material into a furnace chamber. In the docking stage, it is used to receive the material from the material lifting mechanism. In the discharge stage, the processed material is output to the outside of the vacuum reflow oven. Support devices are installed at the bottom of the feed conveyor, the docking conveyor and the discharge conveyor, so that the horizontal position of the feed conveyor, the docking conveyor and the discharge conveyor can be adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of the material conveying system; Figure 2 It is the side view of the material conveying system; Figure 3 This is a structural diagram of the material lifting mechanism; Figure 4 It is a schematic diagram of the structure of the local part of the grabbing component; Figure 5 It is a schematic diagram of the structure of a multi-stage linear transmission mechanism; Figure 6 It is a side view of a multi-section linear transmission mechanism; Figure 7 It is a schematic diagram of the supporting device structure.

[0019] The reference numerals in the drawings are as follows: lifting assembly 1, lifting basket 11, support 111, linear module 12, drive motor 13, top position sensor 14, bottom position sensor 15, moving beam 2, grabbing assembly 3, finger cylinder 31, air claw 311, cylinder stroke sensor 32, clamp seat 33, guide assembly 4, guide shaft 41, shaft mounting plate 42, bearing mounting seat 43, linear bearing 44, feed conveyor table 5, docking conveyor table 6, unloading conveyor table 7, conveyor belt motor 71, conveyor belt structure 72, middle plate 73, photoelectric sensor 74, smooth strip 75, blocker 76, support device 8, connecting beam 81, slide bar 82, adjustment block 83, horizontal adjustment screw 84, abutment 851, height adjustment screw 86, pad 87, frame 9, furnace body chamber 91. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0021] A material conveying system, comprising: A multi-stage horizontal conveying mechanism for horizontally conveying materials, which comprises a feeding conveying platform 5, a connecting conveying platform 6 and a discharging conveying platform 7 which are arranged in sequence; A material lifting mechanism disposed on one side of the multi-stage horizontal conveying mechanism, the material lifting mechanism is used to lift the material from the docking conveying platform 6, or to lower the material and place it on the docking conveying platform 6; Among them, Figure 3 and Figure 4 As shown, the material lifting mechanism includes a lifting component 1, a moving beam 2, a grabbing component 3 for grabbing materials, and a guide component 4. The lifting component 1 is transmission-connected to the moving beam 2, and the moving beam 2 can move along the height direction of the lifting component 1. The moving beam 2 is fixedly connected to the grabbing component 3, and one end of the moving beam 2 is slidingly connected to one of the guide components 4.

[0022] In a specific embodiment of the present invention, a multi-stage horizontal conveying mechanism is arranged directly below the grabbing assembly 3, and the multi-stage horizontal conveying mechanism is horizontally fixed inside the frame 9. The materials involved in the present invention are mainly chips to be processed, and these chips are placed on a chip fixture. The lifting assembly 1 is located on the middle side of the docking conveyor table 6. The chip fixture passes through the feed conveyor table 5 and the docking conveyor table 6 which are arranged in sequence until it reaches the bottom of the corresponding furnace chamber 91. The grabbing assembly 3 is driven by the lifting assembly 1 to move up and down, and the grabbing assembly 3 grabs the chip fixture. The discharge conveyor table 7 outputs the processed materials to the outside of the vacuum reflow oven, thereby forming an automatic feeding material conveying system.

[0023] Furthermore, the moving beam 2 is horizontally arranged and the lifting component 1 is connected to the middle part of the moving beam 2. There are two grabbing components 3, and the two grabbing components 3 are symmetrically arranged on both sides of the lifting component 1. The grabbing component 3 includes two pairs of oppositely arranged finger cylinders 31, and a space for grabbing materials is reserved between the two pairs of finger cylinders 31.

[0024] According to a specific embodiment provided by the present invention, the lifting component 1 of the present invention is used to lift and lower the height of the moving beam 2. The lifting component 1 is installed along the height direction. The lifting component 1 is located in the middle of the moving beam 2 and is fixed to the side of the moving beam 2. The lower part of the moving beam 2 is fixedly connected to the grabbing component 3. The number of the grabbing components 3 can be set to at least one, and can be specifically set according to the actual number of furnace chambers 91. The grabbing component 3 adopts the structure of the finger cylinder 31, and the material is automatically grabbed between two pairs of relatively arranged finger cylinders 31, so the degree of automation is higher.

[0025] In view of the light weight of the chip itself, the material welding process requires extremely high precision. In order to prevent displacement during the conveying process, the stability of the conveying process must be ensured. Therefore, the smooth movement of the moving beam 2 is very important. In this embodiment, the two ends of the moving beam 2 are respectively connected to the guide assembly 4 for sliding connection, so as to ensure that under the guidance of the guide assembly 4, the moving beam 2 can accurately perform a linear lifting motion.

[0026] In the material lifting mechanism of this embodiment, the lifting component 1 is used to lift and lower the height of the moving beam 2. By providing the lifting component 1, the automation level of the material lifting mechanism is improved.

[0027] Furthermore, the lifting assembly 1 includes a linear module 12 and a lifting basket 11 fixed on the moving beam 2, a driving motor 13 is installed at one end of the linear module 12, a top position sensor 14 and a bottom position sensor 15 are installed in the height direction of the linear module 12, and the top position sensor 14 is located above the bottom position sensor 15; The lifting basket 11 is fixed to one side of the moving direction of the moving beam 2, and the lifting basket 11 is arranged along the length direction of the moving beam 2. The finger-shifting cylinders 31 are fixed to the lifting basket 11, and the finger-shifting cylinders 31 are arranged parallel to each other. The finger-shifting cylinders 31 are also equipped with cylinder stroke sensors 32. The cylinder stroke sensors 32 are used to sense the opening or closing state of the air claws 311 of the finger-shifting cylinders 31.

[0028] According to a specific embodiment provided by the present invention, the linear module 12 is arranged in parallel with the guide shaft 41 of the guide assembly 4, and the drive motor 13 is installed at the lower end of the linear module 12. The drive motor 13 can be a servo motor. The servo motor has the advantage of high position control accuracy and can be accurately controlled when loading. The linear module 12 is installed with a top position sensor 14 and a bottom position sensor 15 in the height direction. The top position sensor 14 and the bottom position sensor 15 are used to sense the position of the grabbing assembly 3. The top position sensor 14 and the bottom position sensor 15 can use existing photoelectric sensors on the market. When the lifting basket 11 reaches the position (safe position) of the top position sensor 14 and the bottom position sensor 15, the drive motor 13 stops working and the lifting basket 11 stops moving.

[0029] In this embodiment, the lifting assembly 1 also includes a lifting basket 11 fixed on the moving beam 2. Specifically, the lifting basket 11 is fixed to the lower part of the moving beam 2. A plurality of supports 111 are fixed at the edge position of the upper part of the lifting basket 11, and are fixed to the side of the moving beam 2 through the supports 111. The lifting basket 11 is arranged along the length direction of the moving beam 2, and the finger cylinder 31 is fixed on the lifting basket 11. This embodiment does not limit the width of the lifting basket 11, that is, the width of the lifting basket 11 can be set according to the volume of the vacuum reflow furnace during actual installation and the volume of the furnace chamber 91 for processing materials. The finger cylinders 31 are arranged parallel to each other, and the finger cylinders 31 are arranged in the height direction.

[0030] The finger cylinder 31 of the lifting assembly 1 can adopt the existing structure. The upper end of the finger cylinder 31 is fixed with a clamp seat 33 (the clamp seat 33 is not visible in the figure). The clamp seat 33 adopts a "C"-shaped clamp structure. The clamp seat 33 is fixed on the lower panel of the lifting basket 11. By adjusting the position of the finger cylinder 31 fixed on the clamp seat 33, the height of the finger cylinder 31 can be adjusted, so as to adapt to the clamping and fixation of chip fixtures of different heights, thereby improving the versatility of the present invention.

[0031] In this embodiment, the lifting component 1 is used to lift and lower the height of the moving beam 2. The lifting component 1 includes a linear module 12, and the linear module 12 is located in the height direction. The purpose of this arrangement is to set multiple pairs of furnace body chambers 91 along the height direction of the linear module 12, and use the grabbing component 3 to move the multiple pairs of furnace body chambers 91 up and down to transport materials, thereby improving the overall space utilization of the vacuum reflow soldering furnace equipment, that is, improving the production efficiency.

[0032] The driving motor 13 of the lifting assembly 1 can specifically use an absolute servo motor as the power. The absolute servo motor can control the speed and position accuracy very accurately, and can convert the voltage signal into torque and speed to drive the control object. The rotor speed of the servo motor is controlled by the input signal and can respond quickly. In the automatic control system, it is used as an actuator and has the characteristics of small electromechanical time constant, high linearity, starting voltage, etc. It can convert the received electrical signal into angular displacement or angular velocity output on the motor shaft.

[0033] The finger cylinder 31 has a compact shape, small size, and light weight, and can grasp objects with high repetitive accuracy. The end of the finger cylinder 31 body is hinged with the air gripper 311, and the air gripper 311 can be in a horizontal state or a vertical state when the body is working, so that the chip fixture can be lifted or lowered through the linear module 12. The finger cylinder 31 can realize automatic control by loading a magnetic switch, which improves the degree of automation and reduces manual labor.

[0034] Furthermore, the guide assembly 4 includes a guide shaft 41, a shaft mounting plate 42, a bearing mounting seat 43 and a linear bearing 44. Both ends of the guide shaft 41 are fixed to the shaft mounting plate 42. The guide shaft 41 is installed with the linear bearing 44. The linear bearing 44 is connected to the bearing mounting seat 43. The bearing mounting seat 43 is installed at one end of the moving beam 2.

[0035] According to a specific embodiment provided by the present invention, this embodiment provides a specific structure of a guide assembly 4, wherein a guide shaft 41 of the guide assembly 4 is arranged in the height direction, and both ends of the guide shaft 41 are fixed to the inner wall of the vacuum reflow oven casing through a shaft mounting plate 42. A linear bearing 44 is installed on the guide shaft 41, and the linear bearing 44 is fixed to one end of the moving beam 2 through a bearing mounting seat 43.

[0036] Furthermore, if Figure 5 As shown, the lower parts of the feed conveyor platform 5, the docking conveyor platform 6 and the discharge conveyor platform 7 are all equipped with a supporting device 8, and the supporting device 8 is used to adjust the position of the corresponding feed conveyor platform 5, the docking conveyor platform 6 or the discharge conveyor platform 7 in the width direction, such as Figure 6 and Figure 7 As shown, the supporting device 8 includes a connecting beam 81, a sliding bar 82, an adjustment block 83 and a horizontal adjustment screw 84. The connecting beam 81 has a sliding groove along its length direction, and the sliding bar 82 is slidably arranged in the sliding groove. The adjustment blocks 83 are arranged on both sides of the sliding bar 82. The adjustment blocks 83 are fixed on the connecting beam 81, and each adjustment block 83 is threadedly connected to the horizontal adjustment screw 84. One end of the horizontal adjustment screw 84 is respectively abutted against one side of the sliding bar 82.

[0037] According to a specific embodiment provided by the present invention, in the multi-stage linear conveying mechanism of the present invention, the material first enters the feed conveying platform 5, is transported to the docking conveying platform 6 through the feed conveying platform 5, and is conveyed to the furnace body chamber 91 for processing the material on the docking conveying platform 6. The furnace body chamber 91 can adopt the existing structure, which will not be repeated here. The finger cylinder 31 of the grabbing component 3 puts the product down to the docking conveying platform 6, and conveys the product to the discharge conveying platform 7. The material enters the discharge conveying platform 7 and is finally transported to the next process.

[0038] The support device 8 is installed at the bottom of the multi-stage linear transmission mechanism, and the connecting beam 81 is used to fix and install the support device 8. The slide bar 82 is located in the slide groove opened at the upper part of the connecting beam 81. The length of the slide groove is greater than the length of the slide bar 82, so that the slide bar 82 can slide in the slide groove of the connecting beam 81. The slide bar 82 passes through the slide bar 82 and the connecting beam 81 through a screw to slide and fit and fix (the slide bar 82 and the connecting beam 81 are fixed after the screw is tightened). Specifically, a strip slide hole is opened at the bottom of the slide groove, and the screw (not visible in the screw figure) passes through the strip slide hole and is threadedly engaged with the slide bar 82, and the screw can slide in the strip slide hole. The upper surface of the two ends of the connecting beam 81 is vertically fixed with an adjustment block 83, and the horizontal adjustment screw 84 is horizontal along the length direction of the connecting beam 81. The horizontal adjustment screw 84 is threadedly engaged with its respective adjustment block 83. The protrusions at both ends of the slide bar 82 are greater than the connecting beam 81, so that one end of the horizontal adjustment screw 84 respectively abuts against the abutment portion 851 raised by the slide bar 82. After rotating the horizontal adjustment screw 84, the slide bar 82 can slide in the slide groove of the connecting beam 81, thereby driving the multi-section linear conveying mechanism above the slide bar 82 to move in the width direction, and the conveyor belt structure 72 can be moved in the horizontal left and right directions, so as to better connect the materials.

[0039] In this embodiment, during the operation of the material lifting mechanism, in the feeding stage: the electrical control system component first confirms that the automatic doors of all furnace chambers 91 are in a closed state. When it is determined that a furnace chamber 91 is in a waiting state and there is material on the docking and conveying table 6 at the bottom of the chamber, the three groups of grabbing components located above the interior of the vacuum reflow oven will be driven downward by the linear module 12. After the bottom position sensor 15 at the bottom position of the linear module 12 confirms the position, the air claw 311 of the finger cylinder 31 of the grabbing component 3 corresponding to the furnace chamber 91 will hook the chip fixture on the docking and conveying table 6 from the back and lift it. Subsequently, the drive motor 13 drives the linear module 12 to move the chip fixture to the interior of the vacuum reflow oven. At this time, the automatic door of the furnace chamber 91 in the waiting state will open, and the chip fixture will move downward with the grab assembly 3 to the inside of the automatic door of the furnace chamber 91. The displacement stroke of the grab assembly 3 is to accurately set the top position sensor 14 to the absolute position of the furnace chamber in the waiting state through the absolute value servo system. Then, the air claw 311 of the finger cylinder 31 of the grab assembly 3 is released to place the chip fixture in the furnace chamber 91 in the waiting state. Subsequently, the grab assembly 3 returns to the air above the vacuum reflow oven, and finally the automatic door of the furnace chamber 91 is automatically closed.

[0040] In the unloading stage: the electrical control system component first ensures that the automatic doors of all furnace chambers 91 are in a closed state. Once a furnace chamber 91 is determined to be in a completed state, the electrical control system component will open the automatic door of the furnace chamber 91, and the grabbing component 3 will then move downward along the linear module 12 to the inside of the automatic door of the furnace chamber 91. The displacement stroke of the grabbing component 3 is to accurately set the top position sensor 14 to the absolute position of the furnace chamber 91 in the waiting state through the absolute value servo system, and then the air claw 311 of the finger cylinder 31 of the grabbing component 3 hooks the chip fixture from the bottom. Then, the grabbing component 3 moves upward together with the chip fixture to the air above the inside of the vacuum reflow oven, and the automatic door of the furnace chamber 91 is closed. After the system confirms again that the automatic doors of all furnace chambers 91 are in a closed state, the chip fixture moves downward along the linear module 12 together with the grabbing component 3. When the bottom position sensor 15 of the linear module 12 confirms the position, the air claw 311 of the finger cylinder 31 of the grab assembly 3 is released to place the chip fixture on the docking conveyor table 6 so as to continue to be conveyed to the unloading conveyor table 7 .

[0041] Furthermore, the supporting device 8 also includes a height adjustment component, which includes a height adjustment screw 86 and a pad 87. The height adjustment screw 86 is threadedly connected to the slide bar 82, and the height adjustment screw 86 is arranged perpendicular to the slide bar 82. The pad 87 abuts against the height adjustment screw 86, and the pad 87 is fixedly arranged at the lower part of the feed conveying platform 5, the docking conveying platform 6 or the discharge conveying platform 7.

[0042] According to a specific embodiment provided by the present invention, the height adjustment screw 86 is arranged vertically (along the height direction), and the pad 87 is fixed to the middle plate 73. In order to make the movement of the middle plate 73 more stable during adjustment, the slide bar 82 is connected to two height adjustment components, and the height adjustment screw 86 passes through the strip hole opened in the connecting beam 81 and the slide bar 82 at the same time.

[0043] Furthermore, the feed conveyor platform 5, the docking conveyor platform 6 and the discharge conveyor platform 7 respectively include a conveyor belt motor 71, a conveyor belt structure 72 and an intermediate plate 73, the conveyor belt structure 72 is symmetrically arranged at both ends of the intermediate plate 73 and is respectively fixed to both ends of the intermediate plate 73, the conveyor belt motor 71 is installed on one side of one of the conveyor belt structures 72, and the conveyor belt motor 71 cooperates with the two conveyor belt structures 72 in transmission. The conveyor belt structure 72 can adopt the existing structure, the inner side of the conveyor belt structure 72 is connected to the intermediate plate 73, the conveyor belt motor 71 is installed on one side of the conveyor belt structure 72, the output end of the conveyor belt motor 71 is connected to the pulley and the belt roller, and the conveyor belt is driven to move by the belt roller. The intermediate plate 73 is arranged corresponding to the support device 8, and the support device 8 is arranged and installed at the lower part of the intermediate plate 73. This embodiment provides a specific installation method of the support device 8, and the support device 8 is installed on the intermediate plate 73, specifically, the support device 8 is arranged and installed at the lower part of the intermediate plate 73. The number of the intermediate plates 73 can be set according to the length of the conveyor belt. Generally, there are more than two intermediate plates 73 to ensure the stability of the conveyor belt structure 72. No specific limitation is made here.

[0044] Furthermore, the feed conveyor 5 is equipped with two photoelectric sensors 74 along the material conveying direction, the docking conveyor 6 is equipped with four photoelectric sensors 74 along the material conveying direction, and the discharge conveyor 7 is equipped with two photoelectric sensors 74 along the material conveying direction. The photoelectric sensor 74 can be installed in the middle of the middle plate 73. The photoelectric sensor 74 is used to monitor the position of the material. After the material passes through the photoelectric sensor 74, the photoelectric sensor 74 converts the position signal into an electrical signal and transmits it to the electrical control system, thereby controlling the conveyor motor 71.

[0045] In the multi-stage linear conveying mechanism of this embodiment, the first photoelectric sensor 74 (located on the side of the feeding direction) of the feed conveyor 5 is responsible for detecting the entry of the material (chip fixture). At this time, the conveyor belt motor 71 of the feed conveyor 5 will start working. The second photoelectric sensor 74 on the feed conveyor 5 is used to confirm that the material has completely entered the feed conveyor 5. Once the material has completely entered, the conveyor belt motor 71 will stop working and determine whether the furnace chamber 91 needs to be loaded. According to the judgment result of the electronic control system, during the material forward process, if it is detected that the material has completely left the feed conveyor 5, the conveyor belt motor 71 will stop working.

[0046] The first and second photoelectric sensors 74 on the docking conveyor 6 and the first pair of blocking cylinders (located on one side of the feeding direction) together constitute the first station, while the third and fourth photoelectric sensors 74 and the second pair of blocking cylinders constitute the second station. When the system determines that the furnace chamber 91 above the first station needs to be fed, the first pair of blocking cylinders will be started immediately, and the first photoelectric sensor 74 on the docking conveyor 6 will be started to detect whether the material has entered the first station. At this time, the conveyor motor 71 of the docking conveyor 6 will start working until the material reaches the second photoelectric sensor 74. The second photoelectric sensor 74 is responsible for confirming that the material has completely entered the first station. At this time, the first pair of blocking cylinders prevent the material from continuing to move forward, ensuring that the material stops accurately at the designated furnace chamber 91 position, and then the conveyor motor 71 will stop working. If the system determines that the furnace chamber 91 above the second station needs to be fed, the second pair of blocking cylinders will be started immediately, and the first photoelectric sensor 74 will be started to detect whether the material has entered the first station. At this time, the conveyor belt motor 71 connected to the conveyor table 6 will start working, and the material will continue to move to the third photoelectric sensor 74, which will detect whether the material has entered the second station. When the fourth photoelectric sensor 74 senses that the material has completely entered the second station, the second pair of blocking cylinders will stop the material from moving forward, ensuring that the material stops accurately at the designated furnace chamber 91 position, and then the conveyor belt motor 71 will stop working.

[0047] In the discharge stage, when the first and second photoelectric sensors 74 of the docking conveyor 6 detect that there is material in the first station or the third and fourth photoelectric sensors 74 detect that there is material in the second station, it means that the process material has been successfully placed on the docking conveyor 6 by the grabbing component 3. At this time, the system needs to confirm that the grabbing component 3 has returned to the upper safety position (i.e. the top position sensor position). Subsequently, the conveyor motor 71 of the docking conveyor 6 will start working. After the material passes through the docking conveyor 6, the first photoelectric sensor 74 of the discharge conveyor 7 detects that the material has entered, and the conveyor motor 71 continues to work until the second photoelectric sensor 74 detects that the material has completely entered the discharge conveyor 7, at which time the conveyor motor 71 will stop working.

[0048] Furthermore, the feed conveyor platform 5, the docking conveyor platform 6 and the discharge conveyor platform 7 are connected in sequence by smooth strips 75, and the smooth strips 75 are arranged on the side of the conveyor belt structure 72, and the smooth strips 75 are distributed along the length direction of the conveyor belt structure 72; the docking conveyor platform 6 also includes at least one pair of blockers 76, and the blockers 76 are installed on one side of the middle plate 73, and the blockers 76 are respectively distributed along the material conveying direction of the docking conveyor platform 6.

[0049] In this embodiment, the smooth strip 75 is installed on the outside of the conveyor belt structure 72. The smooth strip 75 can be a strip-shaped plate. The smooth strip 75 can connect two adjacent conveyor belt structures 72 and guide the material so that the material can avoid moving along the width direction of the conveyor belt structure 72 under the drive of the transmission belt structure. The two ends of the inner side of the smooth strip 75 have rounded corners to allow the material to pass through better.

[0050] The number of the blockers 76 can be set corresponding to the number of the furnace chambers 91 . The blockers 76 are installed on the side of the middle plate 73 close to the feed conveying platform 5 . The blockers 76 are distributed along the material conveying direction of the connecting conveying platform 6 .

[0051] Specifically, the blocker 76 can adopt a cylinder structure, and the blocker 76 is arranged along the height direction. A blocking plate is fixed at the end of the cylinder structure. The blocking plate can select a suitable structure according to the shape of the actual material (i.e., the chip fixture), such as a plate structure or a block structure. When the cylinder is extended, it can block the material from continuing to move forward. In the docking stage, the blocking cylinder works to extend the blocking plate, and then the material is transferred to the docking conveying platform 6 and reaches the waiting state, that is, when it is under the furnace chamber 91, the blocking plate blocks the material to prevent the material from continuing to be transmitted. At this time, the electrical control system needs to confirm that all the automatic doors of the furnace chamber 91 are in a closed state. The blockers 76 arranged in pairs can ensure the stability of the force on the material (chip fixture).

[0052] In addition, the present invention also claims a vacuum reflow oven, such as Figure 1 and Figure 2 As shown, it includes a frame 9, in which any one of the above-mentioned material conveying systems is installed, and at least one pair of furnace body chambers 91 are installed in the frame 9 along the height direction, and each pair of furnace body chambers 91 is respectively arranged corresponding to the grabbing components 3 of the material lifting mechanism.

[0053] In this embodiment, the frame 9 is fixed inside the outer shell of the vacuum reflow soldering furnace equipment. The outer shell (not visible in the figure) is installed with an electrical control system. The furnace body chamber 91 is installed in the middle of the frame 9. The furnace body chamber 91 is symmetrically located on both sides of the linear module 12 of the lifting component 1 with the linear module 12 as the axis. The number of furnace body chambers 91 can be set to one pair, two pairs..., and this embodiment specifically uses two pairs of furnace body chambers 91. Each grabbing component 3 corresponds to a row of furnace body chambers 91 in the height direction, thereby improving the lifting efficiency of the material and improving the space utilization of the vacuum reflow soldering furnace.

[0054] Function of the furnace chamber 91: The furnace chamber 91 is the welding work area, and air is extracted by a vacuum pump to form a vacuum environment. A high vacuum environment helps to reduce oxidation and contamination during the welding process, thereby improving the welding quality and the reliability of electronic products. Welding in a vacuum environment can effectively prevent device oxidation, reduce the void rate of the welding surface, and improve the reliability of the device. It can also meet the needs of high-temperature solder welding, and can usually support high-temperature welding up to 450°C. In the present invention, each furnace chamber 91 can operate independently, and the furnace chambers 91 are isolated from each other and do not interfere with each other. The independent operation of multiple furnace chambers 91 enables the vacuum reflow oven to handle multiple different welding tasks at the same time, thereby improving the efficiency and flexibility of the equipment.

[0055] Finally, it should be noted that in the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0056] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A material conveying system, characterized in that: include: A multi-stage horizontal conveying mechanism for horizontally conveying materials, which comprises a feeding conveying platform, a connecting conveying platform and a discharging conveying platform arranged in sequence; A material lifting mechanism disposed on one side of the multi-stage horizontal conveying mechanism, the material lifting mechanism is used to lift the material from the docking conveying platform, or to lower the material and place it on the docking conveying platform; Among them, the material lifting mechanism includes a lifting component, a moving beam, a grabbing component for grabbing materials and a guide component. The lifting component is transmission-connected to the moving beam, the moving beam can move along the height direction of the lifting component, the moving beam is fixedly connected to the grabbing component, and one end of the moving beam is slidingly connected to one of the guide components.

2. A material conveying system according to claim 1, characterized in that: The moving beam is arranged horizontally and the lifting component is connected to the middle part of the moving beam. There are two grabbing components, which are symmetrically arranged on both sides of the lifting component. The grabbing component includes two pairs of finger cylinders arranged opposite to each other, and a space for grabbing materials is reserved between the two pairs of finger cylinders.

3. A material conveying system as claimed in claim 2, characterized in that: The lifting assembly includes a linear module and a lifting basket fixed on the moving beam, a driving motor is installed at one end of the linear module, a top position sensor and a bottom position sensor are installed in the height direction of the linear module, and the top position sensor is located above the bottom position sensor; The lifting basket is fixed on one side of the moving direction of the moving beam, and the lifting basket is arranged along the length direction of the moving beam. The finger cylinders are fixed on the lifting basket, and the finger cylinders are arranged parallel to each other. The finger cylinders are also equipped with cylinder stroke sensors.

4. A material conveying system as claimed in claim 3, characterized in that: The guide assembly includes a guide shaft, a shaft mounting plate, a bearing mounting seat and a linear bearing. The two ends of the guide shaft are fixed to the shaft mounting plate. The guide shaft is installed with the linear bearing, and the linear bearing is connected to the bearing mounting seat. The bearing mounting seat is installed at one end of the moving beam.

5. A material conveying system according to any one of claims 1 to 4, characterized in that: The lower part of the feed conveyor platform, the docking conveyor platform and the discharging conveyor platform are all equipped with a supporting device, and the supporting device is used to adjust the width direction position of the corresponding feed conveyor platform, the docking conveyor platform or the discharging conveyor platform. The supporting device includes a connecting beam, a slide bar, an adjustment block and a horizontal adjustment screw. The connecting beam has a slide groove along its length direction, and the slide bar is slidably arranged in the slide groove. The adjustment blocks are arranged on both sides of the slide bar, and the adjustment blocks are fixed on the connecting beam. Each adjustment block is threadedly connected to the horizontal adjustment screw, and one end of the horizontal adjustment screw is respectively abutted against one side of the slide bar.

6. A material conveying system as claimed in claim 5, characterized in that: The supporting device also includes a height adjustment component, which includes a height adjustment screw and a pad. The height adjustment screw is threadedly connected to the slide bar, and the height adjustment screw is arranged perpendicular to the slide bar. The pad abuts against the height adjustment screw, and the pad is fixedly arranged at the bottom of the feed conveying platform, the docking conveying platform or the discharge conveying platform.

7. A material conveying system according to claim 6, characterized in that: The feed conveyor platform, docking conveyor platform and discharging conveyor platform respectively include a conveyor belt motor, a conveyor belt structure and an intermediate plate. The conveyor belt structure is symmetrically arranged at both ends of the intermediate plate and is respectively fixed to both ends of the intermediate plate. The conveyor belt motor is installed on one side of one of the conveyor belt structures. The conveyor belt motor cooperates with the two conveyor belt structures in transmission. The intermediate plate is arranged corresponding to the supporting device, and the supporting device is arranged and installed at the lower part of the intermediate plate.

8. A material conveying system according to claim 7, characterized in that: The feed conveyor platform is equipped with two photoelectric sensors along the material conveying direction, the docking conveyor platform is equipped with four photoelectric sensors along the material conveying direction, and the discharge conveyor platform is equipped with two photoelectric sensors along the material conveying direction.

9. A material conveying system according to any one of claims 6 to 8, characterized in that: The feed conveyor platform, the docking conveyor platform and the discharge conveyor platform are connected in sequence by smooth strips, the smooth strips are arranged on the side of the conveyor belt structure, and the smooth strips are distributed along the length direction of the conveyor belt structure; the docking conveyor platform also includes at least one pair of blockers, the blockers are installed on one side of the middle plate, and the blockers are distributed along the material conveying direction of the docking conveyor platform.

10. A vacuum reflow oven, characterized in that: It comprises a frame in which a material conveying system according to any one of claims 1 to 9 is installed, at least one pair of furnace chambers are installed in the frame along the height direction, and each pair of furnace chambers is respectively arranged corresponding to the grabbing components of the material lifting mechanism.

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