Vacuuming equipment and vacuuming method for thermos cup

Abstract

The invention discloses a vacuum pumping equipment for a thermos cup and a vacuum pumping method thereof, comprising a pre-vacuum chamber, a heating chamber, a welding chamber and a cooling chamber which are arranged in sequence, a material continuous conveying device being arranged at the bottom of each chamber, and a heating device being arranged at the pre-vacuum chamber, the heating chamber and the welding chamber; and further comprising a laser welding device which is controllably and movably arranged above the welding chamber; at least one transparent window is arranged on the top surface of the welding chamber, and a laser beam of the laser welding device passes through the transparent window to melt a welding ball arranged at the center hole of the cup bottom; the heating chamber and the welding chamber are both connected to a high vacuum pumping system, and the pre-vacuum chamber and the cooling chamber are both connected to a low vacuum pumping system; an inlet valve which can be moved up and down is arranged at the inlet of the pre-vacuum chamber, and an outlet valve which can be moved up and down is arranged at the outlet of the cooling chamber; the vacuum pumping method for the vacuum pumping equipment for the thermos cup is adopted to continuously vacuum the thermos cup, thereby improving the product qualification rate and processing efficiency and realizing automated mass production.

Description

Technical Field

[0001] The invention relates to a thermos cup processing device, in particular to a thermos cup vacuuming equipment for vacuuming a cup body and welding a vacuuming hole and a vacuuming method thereof. Background Art

[0002] At present, thermos cups are generally vacuum-insulated cups, that is, the interlayer of the double-layer structure cup body is evacuated into a vacuum. The insulation performance of the thermos cup is determined by the vacuum degree of the interlayer. The existing vacuuming process is generally divided into tail vacuuming process and tailless vacuuming process. The tailless vacuuming process with better sealing performance and higher reliability is widely adopted by various companies in the industry. The tailless vacuuming process mainly refers to the sealing method of the vacuum hole of the thermos cup by using brazing material. The brazing material used in the industry is generally a glass substrate. The principle is to use high temperature in the vacuum furnace to melt the brazing material and fuse it with the vacuum hole at the bottom of the thermos cup to achieve sealing, so that the thermos cup can achieve the function of vacuum insulation. The tailless vacuuming process needs to be carried out under high vacuum conditions throughout the process. At present, the thermos cup is placed in the vacuum furnace of a single-furnace vacuum machine, starting from low-pressure extraction at room temperature to high-pressure extraction at high temperature and then to cooling. The entire vacuuming process requires very high energy consumption and a long processing cycle. The processing cycle of a furnace product takes more than 5 hours. The production efficiency and energy saving are very low, and it cannot adapt to the current automation transformation.

[0003] To this end, technical personnel in the industry have made many improvements, such as the patent "201910255200.4 Vacuum chamber and continuous vacuuming process for continuous vacuuming of vacuum insulation cups", which includes three chambers from feeding to discharging, namely a preheating chamber, a brazing chamber and a cooling chamber; another example is the patent "201821858591.6 Fully automatic high vacuum brazing equipment for insulation cups", which includes a pre-vacuum chamber, a heating chamber, a welding chamber, a cooling chamber and a cup discharge chamber which are interconnected and arranged in sequence. The above two solutions are only the splitting of the existing vacuum process and the setting of multiple chambers. In essence, they are still the sealing process for glass-based solders. However, glass-based solders need to be specially purchased and equipped. The cost of glass-based solders is also relatively high, and the heavy metals contained in them also cause certain pollution to the environment. The temperature of the molten sealing is required to reach above 500 degrees. The material is black after molten sealing, and the adsorption capacity to the plastic powder of the spray-coated cup body is also poor. In addition, this type of sealing belongs to the welding of dissimilar materials, and the welding strength is relatively low, which will cause part of the cup body to drop the brazing material after sealing, resulting in no vacuum and a high scrap rate. Summary of the invention

[0004] The purpose of the present invention is to provide a vacuum evacuation equipment and a vacuum evacuation method for a thermos cup, which greatly reduces the cost, ensures the welding quality, and has no heavy metal pollution to the environment, and also greatly reduces the welding difficulty, improves the product qualification rate and processing efficiency, and realizes automated mass production while saving energy and reducing emissions.

[0005] To achieve the above object, the present invention adopts the following technical solution:

[0006] Technical Solution 1: A vacuum evacuation equipment for a thermos cup, comprising a pre-evacuation chamber, a heating chamber, a welding chamber and a cooling chamber which are arranged in sequence, adjacent chambers are connected or isolated by a plug valve which can be moved up and down, a material continuous conveying device is provided at the bottom of the chamber, and the pre-evacuation chamber, the heating chamber and the welding chamber are provided with a heating device; it also comprises a controllably movable laser welding device arranged above the welding chamber; at least one transparent window is provided on the top surface of the welding chamber, and the laser beam of the laser welding device passes through the transparent window to melt the welding ball arranged at the center hole of the bottom of the cup; the heating chamber and the welding chamber are both connected to a high vacuum exhaust system, and the pre-evacuation chamber and the cooling chamber are both connected to a low vacuum exhaust system; an inlet valve which can be moved up and down is provided at the entrance of the pre-evacuation chamber, and an outlet valve which can be moved up and down is provided at the outlet of the cooling chamber.

[0007] Preferably, it also includes a visual scanning camera that is controllably and movably disposed above the welding chamber.

[0008] Preferably, the transparent window is made of high temperature resistant glass; the visible range of the transparent window covers all thermos cups; the number of the transparent windows is the same as the number of all thermos cups and corresponds one to one; the transparent windows are all square with a side length of 30 to 60 mm or circular with a diameter of 30 to 60 mm.

[0009] Preferably, the material continuous conveying device includes tracks respectively arranged at the bottom of each chamber, a transmission mechanism arranged at the outside of each chamber, a material cart controllably arranged on the track, and a material rack placed on the material cart for placing thermos cups; the transmission mechanism controls the material cart to move along the track, and the transmission mechanism includes a transmission shaft assembly connected to the power source, a transmission gear arranged at the rear end of the transmission shaft assembly, and a rack arranged at the bottom of the material cart and coordinated with the transmission gear for transmission.

[0010] Preferably, each chamber is also provided with a detection position mechanism; the detection position mechanism includes an induction switch arranged outside the chamber, an induction sheet connected to the induction switch signal, a detection rod fixed to the induction sheet at one end, a balancing block arranged at one end of the detection rod passing through the chamber, a collision block arranged on the side of the material cart close to one end of the balancing block, and a magnet providing restoring force for the induction sheet; the contact transition surface between the collision block and the balancing block is an arc surface, and after the balancing block contacts the collision block, the induction switch is turned on or off through the rotational deformation of the induction sheet to control the stop or operation of the material cart.

[0011] Preferably, the material pushing mechanisms are arranged at intervals; tracks corresponding to the tracks of the material continuous conveying device are provided on the loading platform in front of the pre-evacuation chamber and on the unloading platform behind the cooling chamber; and at least three pairs of wheels are provided at the bottom of the material cart.

[0012] Preferably, each set of lifting mechanisms is symmetrically arranged on the outside of the track; the edge of the material rack extends out of the edge of the material cart; the lifting mechanism includes a lifting rod located below the edge of the material rack, and the lifting rod is connected to a power source, and under the action of the power source, the lifting rod lifts the edge of the material rack to lift the material rack from the material cart.

[0013] Preferably, a positioning fixture for placing the thermos cup is provided on the material rack, and the positioning fixture is connected to the material rack in a plug-in manner.

[0014] Technical Solution 2: A vacuuming method for a vacuum evacuation device for a thermos cup, comprising the above-mentioned vacuum evacuation device for a thermos cup, performing the following steps:

[0015] S1: Open the inlet valve, the material rack loaded with the thermos cup enters the designated position of the low vacuum pre-evacuation chamber from the loading platform through the material cart via the track and stops, the material rack is lifted up by the material lifting mechanism and separated from the material cart, the material cart exits the low vacuum pre-evacuation chamber and returns to the loading platform, the material lifting mechanism drives the material rack to descend and reset and close the inlet valve, the system detects that the inlet valve is closed and starts the low vacuum operation, when the vacuum degree reaches 4×10 2 Pa, speed up the vacuuming and start preheating. Turn off the heating after the temperature reaches 200 degrees. When the vacuum degree reaches 1×10 -1 Pre-pumping is completed at Pa;

[0016] S2: After the pre-evacuation is completed, the gate valve of the heating chamber is opened, and the material rack is lifted up by the material lifting mechanism of the low vacuum pre-evacuation chamber. At the same time, the material cart of the high vacuum heating chamber enters the low vacuum pre-evacuation chamber via the track and stops. The material lifting mechanism descends and places the material rack on the material cart. The material cart with the material rack enters the high vacuum heating chamber via the track and closes the gate valve of the heating chamber. At this time, the low vacuum pre-evacuation chamber repeats step S1; after the system detects and closes the valve of the heating chamber, the high vacuum operation starts and the temperature in the furnace starts to be heated to 450 degrees. When the vacuum degree reaches 1×10 -3 Pa, keep the temperature at 450°C for 20 minutes to activate the getter;

[0017] S3: The high vacuum insulation welding chamber and the high vacuum heating chamber start high vacuum pumping operation simultaneously, and the vacuum degree of the high vacuum insulation welding chamber reaches 1×10 -3Pa, the temperature reaches 450 degrees and is maintained; after the getter is activated in step S2, the gate valve of the welding chamber is opened, and the material cart with the material rack enters the high vacuum insulation welding chamber via the track and stops for positioning, and the material rack is lifted up and separated from the material cart by the material cart, and the material cart returns to the high vacuum heating chamber, and the material rack is driven down by the material rack to reset and close the welding chamber valve, and the high vacuum heating chamber repeats step S2 at this time; after the system detects and closes the gate valve of the welding chamber, the position of the laser welding gun of the laser welding device is reset to zero, and welding is performed in sequence from the zero position through the transparent window according to the preset travel parameters, and the preset travel parameters correspond to the placement interval of the insulation cup on the material rack, and the laser welding gun melts the welding ball and the vacuum hole of the insulation cup into one to complete the welding;

[0018] S4: After welding is completed, open the gate valve of the cooling chamber, the material rack is lifted up by the material lifting mechanism of the high vacuum insulation welding chamber, and the material cart of the low vacuum cooling chamber enters the high vacuum insulation welding chamber via the track and stops, the material lifting mechanism descends and places the material rack on the material cart, the material cart with the material rack enters the low vacuum cooling chamber via the track and closes the gate valve of the cooling chamber, and the high vacuum insulation welding chamber repeats step S3; after the system detects and closes the gate valve of the cooling chamber, monitor the room temperature and indoor pressure of the cooling chamber, when the room temperature drops to 230 degrees, open the inflation valve, fill the cooling chamber with air or nitrogen, and when the indoor pressure is the same as the external pressure, the cooling is completed;

[0019] S5: After cooling is completed, the outlet valve is opened, and the material cart with the material rack enters the unloading platform via the track and stops. After unloading, the material cart returns to the low vacuum cooling chamber and closes the outlet valve. At this time, the low vacuum cooling chamber repeats step S4.

[0020] Preferably, before welding, the laser welding device in step S3 uses a visual scanning camera controllably and movably arranged above the welding room to scan the welding positions of all the thermos cups through a transparent window, and the laser welding gun performs spot welding through the transparent window according to the visual scanning result, so that the welding ball and the vacuum hole of the thermos cup are melted into one to complete the welding.

[0021] Compared with the prior art, the invention has the following advantages: first, it adopts the laser welding method, from low-pumping at room temperature, high-pumping at high temperature, high-pumping at insulation temperature to low-pumping and cooling, shortening the overall process flow, greatly reducing energy consumption, eliminating the use of glass-based solder, reducing the cost of sealing materials, and avoiding the disadvantages of using glass-based solder, that is, the temperature requirement for the vacuum sealing process is lower, reducing energy consumption, and avoiding the pollution of heavy metal emissions to the environment; second, it directly uses the metal welding ball with the same material as the cup body for laser welding, so that the same metal welding has higher strength, stronger stability and sealing After connection, the color is consistent with the cup body, and the adsorption of plastic powder is also consistent with the cup body, which improves the subsequent spraying effect; third, laser welding is carried out at the transparent window, which not only ensures the normal progress of laser welding, but also ensures the thermal insulation performance of the welding room, and improves the product processing quality; fourth, through the material continuous conveying device, the material is continuously conveyed to each chamber, and multiple chambers are continuously vacuumed to achieve batch production, reduce energy consumption, and improve production efficiency. It can also realize docking with other process production lines with a high degree of automation. Each chamber can be equipped with a separate opening and closing door, so that each chamber can be inspected and repaired separately.

[0022] Further beneficial effects: First, the visual scanning camera is arranged above the welding room, and the visual scanning camera scans the position to be welded through the transparent window. According to the scanning results, the laser welding gun of the laser welding device performs welding operations through the transparent window, and the welding positioning is more accurate and the welding quality is higher; second, the visual range of the transparent window covers all the thermos cups, and the transparent window is made of high-temperature resistant glass, which not only ensures the thermal insulation performance of the high-vacuum thermal insulation welding room, but also ensures the smooth completion of laser welding and improves the welding quality; third, the number of transparent windows is set to be the same as the number of thermos cups and corresponds one to one, which is convenient for the corresponding scanning of the visual scanning camera and the corresponding welding of the laser welding device, and also improves the thermal insulation performance of the welding room; fourth, the thermos cup is placed on the material The material cart is on the material rack of the trolley, and the trolley transfers the thermos cup to each chamber for vacuuming on the track arranged in sections at the bottom of the chamber. At least three pairs of wheels are arranged at the bottom of the trolley, which can ensure the smooth transition of the trolley on each section track, facilitate continuous operation of the thermos cup, save energy and improve production efficiency; fifth, the collision block hits the balance block on the detection rod, and the induction sheet and induction switch at the other end of the detection rod control the stop or operation of the trolley, so that the trolley stops at the predetermined position and positions accurately, so as to realize the automatic operation of each chamber; sixth, at least one set of ejecting mechanism is arranged for each interval of track. Specifically, the ejecting mechanism is arranged at the bottom of the pre-evacuation chamber and the welding chamber, so that the tracks at the adjacent two ends share one trolley, which effectively reduces the number of trolleys and ejecting mechanisms used, and greatly It greatly saves costs, and the ejecting mechanism in the welding room ejects the material rack from the material cart. After the material cart exits the welding room, the material rack is placed on the track for welding. The material rack is more stable and has higher welding accuracy. Seventh, the ejecting mechanism is symmetrically arranged on both sides of the track, and the edge of the material rack is lifted up at the same time, so that the material rack is lifted up more stably. Eighth, the material rack is provided with a positioning fixture to facilitate the fixed-point positioning of the thermos cup. The plug-in connection of the positioning fixture can be applied to thermos cups of different models, which expands the scope of application and facilitates rapid mold change, greatly improving the processing efficiency. Ninth, the travel parameters of the laser welding device can be changed according to the number of laser welding guns on the laser welding device. When the laser welding gun is set to one, the travel parameters can be set to zero, and the thermos cups can be welded one by one. Next, when there are two or more laser welding guns, the travel parameters can be set to weld the thermos cups in rows in sequence; when the number of laser welding guns is set to be the same as the number of thermos cups on the rack, the travel parameters can be set to weld all the thermos cups on the rack at one time. The appropriate number of laser welding guns can be selected according to the specific situation of the production line, and the welding travel parameters can be changed accordingly. It has a wide range of applications and is conducive to promotion; tenth, the power source, positioning detection mechanism, transmission mechanism, etc. in the laser welding device and the continuous material conveying device are all installed outside the vacuum furnace, avoiding the problems of difficulty in heat insulation and short life of these mechanisms when working in a high temperature environment, and reducing the space of the furnace chamber, simplifying the overall structure while saving energy, and making it easier to maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the vacuum evacuation equipment for a thermos cup of the present invention;

[0024] Figure 2 It is a schematic diagram of the top view of the vacuum evacuation equipment for a thermos cup of the present invention;

[0025] Figure 3 It is a structural schematic diagram of a single-section chamber track in the vacuum evacuation equipment for a thermos cup of the present invention;

[0026] Figure 4 It is a structural schematic diagram of the detection position mechanism;

[0027] Figure 5 It is a structural schematic diagram of the thermos cup to be processed;

[0028] Figure 6 It is a schematic diagram of the structure of the material rack from a top view;

[0029] Figure 7 It is a circuit diagram of the vacuum evacuation equipment for the thermos cup of the present invention. DETAILED DESCRIPTION

[0030] In order to make the technical solution of the present invention clearer, the following Figure 1-7 It should be understood that the specific implementation methods described in this specification are only for explaining the present invention, and are not intended to limit the protection scope of the present invention.

[0031] Embodiment 1: A vacuum evacuation equipment for a thermos cup, which is arranged between a loading platform 100 and an unloading platform 200, comprises four vacuum chambers arranged in sequence along the conveying direction of the workpiece to be processed, namely a pre-evacuation chamber 401, a heating chamber 402, a welding chamber 403, a cooling chamber 404, and a material continuous conveying device arranged at the bottom of the chamber, and a laser welding device 9 which is controllably arranged above the welding chamber 403; the shells of each vacuum chamber are made of 304 stainless steel or carbon steel, and the heat insulation material is a metal heat insulation screen, which contains at least three layers of metal materials such as stainless steel and molybdenum; controllably movable gate valves are arranged between adjacent chambers for connecting or isolating adjacent chambers, including an inlet valve 70 arranged at the entrance of the pre-evacuation chamber 401, a heating chamber valve 71 arranged between the pre-evacuation chamber 401 and the heating chamber 402, a welding chamber valve 72 arranged between the heating chamber 402 and the welding chamber 403, a cooling chamber valve 73 arranged between the welding chamber 403 and the cooling chamber 404, and a cooling chamber valve 74 arranged between the welding chamber 403 and the cooling chamber 404. The outlet valve 74 at the outlet of the chamber 404, the gate valve and the up and down movement of the gate valve are all prior art. This embodiment takes the drive mechanism 7 of the gate valve composed of a chain, a balancing gear matched with the chain and an oil cylinder as an example, but is not limited to the up and down lifting structure; the pre-evacuation chamber 401, the heating chamber 402 and the welding chamber 403 are all provided with a heating device; the heating chamber 402 and the welding chamber 403 are all connected to a high vacuum exhaust system, and the pre-evacuation chamber 401 and the cooling chamber 404 are all connected to a low vacuum exhaust system; the heating device, the high vacuum exhaust system and the low vacuum exhaust system are all prior art, the low vacuum system includes a Roots pump and a sliding valve pump, and the high vacuum system includes a rotary vane vacuum pump and a diffusion pump; the material continuous conveying device is used to continuously transport the workpiece to be processed to each chamber for vacuum operation; the top surface of the welding chamber 403 is provided with at least one transparent window 10, and the laser beam of the laser welding device 9 passes through the transparent window 10 to melt the welding ball 11 provided at the center hole of the cup bottom (refer to the attached Figure 5 ), the welding ball 11 can be made of the same material as the cup body, such as iron, titanium, stainless steel, etc. The laser welding device 9 and its control mechanism are prior art. The laser welding device 9 includes a laser welding gun. The mechanism for controlling the activity of the laser welding device 9 may include a transverse transmission mechanism and a longitudinal transmission mechanism, and the longitudinal transmission mechanism is arranged on the transverse transmission mechanism to realize the free movement of the laser welding gun in the transverse and longitudinal directions; the motor in the transmission mechanism of the laser welding gun may be a servo motor, and the servo motor is controlled by a servo driver and an encoder of a servo system. The servo system, servo driver, encoder, and servo motor are all prior art. Please refer to the attached Figure 7 As shown, two servo motors M1 and M2 respectively control the welding in the horizontal direction (ie, X-axis) and the vertical direction (ie, Y-axis); the transparent window 10 is made of high temperature resistant glass; the visible range of the transparent window 10 covers all the thermos cups.

[0032] See attached Figure 2As shown, the transparent window 10 of this embodiment adopts a multi-piece combination structure. The number of transparent windows 10 is the same as the number of thermos cups 300 on the material continuous conveying device in the welding room and corresponds one to one. The transparent windows 10 are all square with a side length of 30 to 60 mm or circular with a diameter of 30 to 60 mm, which ensures the thermal insulation performance of the welding room while ensuring that the laser beam of the laser welding gun passes through the transparent window to complete the welding smoothly; the laser welding gun of the laser welding device can be set as needed to weld the thermos cups row by row, or more than two can be set to weld the thermos cups row by row, or the same number of welding guns as the thermos cups can be set to complete the welding at one time, thereby improving the welding efficiency.

[0033] The material continuous conveying device includes a controller, a track 1 which is segmented and arranged at the bottom of each chamber, a transmission mechanism 3 which is arranged on the side of each track 1, a material cart 2 which is controllably arranged on the track 1, a material rack 6 for placing a thermos cup 300 on the material cart 2, a material pushing mechanism 4, and a positioning detection mechanism 5; the controller is connected to control the transmission mechanism 3, the positioning detection mechanism 5, and the material pushing mechanism 4; a positioning fixture 8 for placing the thermos cup 300 is provided on the material rack 6; the positioning fixture 8 includes a clamping body, and a clamping body arranged in a rectangular array on the clamping body, and the thermos cup 300 is inverted on the clamping body with its bottom facing upwards; the positioning fixture 8 is connected to the material rack 6 in a plug-in manner, and the setting of the positioning fixture 8 is convenient for the thermos cup 300 to be fixed at a fixed point The plug-in connection of the positioning fixture 8 is convenient for quick mold change and is suitable for different types of thermos cups. It expands the scope of application and greatly improves the processing efficiency. At least three pairs of wheel hubs 21 are evenly distributed on the bottom of the material cart 2. The wheel hubs 21 are located on the track 1 and the material cart 2 travels or stops on the track 1 through the transmission mechanism 3. The loading platform 100 in front of the pre-evacuation chamber 401 and the unloading platform 200 behind the cooling chamber 404 are also provided with tracks corresponding to the tracks of the material continuous conveying device. The transmission mechanism 3 transfers the material cart with the thermos cup on the loading platform 100 to the pre-evacuation chamber 401, the heating chamber 402, the welding chamber 403, and the cooling chamber 404 in turn. After the vacuuming and welding operations are completed, it is transferred to the unloading platform 200; the transmission mechanism 3 controls the material cart 2 to travel along the track 1, and the transmission mechanism 3 includes a transmission shaft assembly connected to the power source, a transmission gear 34 arranged at the rear end of the transmission shaft assembly, and a rack 20 arranged at the bottom of the material cart 2 and cooperating with the transmission gear 34 for transmission; specifically, the transmission shaft assembly includes two transverse transmission shafts 31 perpendicular to the track 1, and a longitudinal transmission shaft 32 perpendicular to the transverse transmission shaft 31 and connecting the two transverse transmission shafts 31; both ends of the longitudinal transmission shaft 32 are provided with a bevel gear set 33, and the longitudinal transmission shaft 32 transmits power to the two transverse transmission shafts 31 through the bevel gear set 33; the transmission gear 34 is arranged at the rear end of the transverse transmission shaft 31, and the rack 20 at the bottom of the material cart 2 and the transmission gear 3 4; the power source is a motor 30, and the motor 30 transmits power to the longitudinal transmission shaft 32 through a transmission belt 35, the motor 30 drives the longitudinal transmission shaft 32 to rotate, and the two transverse transmission shafts 31 rotate simultaneously under the transmission of the bevel gear set 33, thereby driving the transmission gear 34 on the transverse transmission shaft 31 to rotate, and under the action of the transmission gear 34 and the rack 20, the material car 2 is driven on the track 1; the motor 30, the longitudinal transmission shaft 32, and the bevel gear set 33 are all arranged outside the vacuum furnace, and the transverse transmission shaft 31 penetrates into the vacuum furnace; the motor 30 can be a servo motor, and the servo motor is controlled by a servo driver and an encoder of a servo system. The servo system, servo driver, encoder, and servo motor are all prior art; refer to the attached Figure 7As shown, the motors of the transmission mechanisms in the four chambers in the vacuum furnace are M3, M4, M5, and M6, which respectively control the material cart 2 to enter the pre-evacuation chamber 401 for pre-evacuation, enter the heating chamber 402 for high-evacuation, enter the welding chamber 403 for welding, and enter the cooling chamber 404 for cooling.

[0034] The loading platform 100 and the unloading platform 200 are also provided with a transmission mechanism of the material cart 2, which can be the same as the transmission mechanism outside each chamber of the vacuum furnace. The motors in the transmission mechanisms of the loading platform 100 and the unloading platform 200 can also be connected to the frequency converter respectively. Figure 7 As shown, the motor is controlled by a frequency converter.

[0035] The lifting mechanism 4 is arranged on the side of the track 1, and at least one group of lifting mechanisms 4 is arranged at each interval of a section of the track 1; the two lifting mechanisms in each group of lifting mechanisms 4 are symmetrically arranged on both sides of the track 1; the edge of the material rack 6 extends out of the edge of the material cart 2, and the lifting mechanism 4 lifts the material rack 6 by lifting the edge of the material rack 6; the lifting mechanism 4 includes a lifting rod located below the edge of the material rack 6, and the lifting rod is connected to a power source. Under the action of the power source, the lifting rod lifts the edge of the material rack to lift the material rack from the material cart, and the power source can be a cylinder; specifically, Specifically, the ejection mechanism 4 includes a cylinder 41, a transmission rack 47, a gear 48, a main transmission shaft 45, a secondary transmission shaft 46, an ejection seat 49, an ejection rack 42, an input gear 43, an output gear 44, and a push plate 40; the cylinder 41 is the power source of the ejection mechanism 4, and the cylinder 41 is connected to the transmission rack 47 to drive the reciprocating motion of the transmission rack 47; the gear 48 cooperates with the transmission rack 47, and the gear 48 is fixed to one end of the main transmission shaft 45. The cylinder 41 is connected to the transmission rack 47 and the gear 48 to push the ejection rack 42. The power is transmitted to the main transmission shaft 45; the ejector seat 49 is symmetrically arranged on both sides of the track 1, and the input gear 43 and the output gear 44 constitute a pair of gear pairs, the input gear 43 and the output gear 44 are matched with each other, and are both arranged in the ejector seat 49; there are two ejector racks 42, which are symmetrically arranged in the ejector seat 49, and the two ejector racks 42 are respectively matched with the input gear 43 and the output gear 44, and control the ejector rack 42 to move up and down; the push plate 40 is vertically arranged on the top of the ejector rack 42; The main transmission shaft 45 passes through the input gear 43 in the two symmetrical material ejecting seats 49 in sequence, and the secondary transmission shaft 46 passes through the output gear 44 in the two material ejecting seats 49 in sequence; the edge of the material rack 6 extends out of the edge of the material cart 2, and the push plate 40 is arranged below the edge of the material rack 6. Under the drive of the oil cylinder 41, the transmission rack 47 drives the main transmission shaft 45 to rotate through the gear 48. Under the action of the input gear 43 and the output gear 44, the material ejecting racks 42 in the material ejecting seats 49 on both sides of the track 1 are controlled to move up and down synchronously to lift or lower the material rack 6.

[0036] The detection position mechanism 5, refer to the attached Figure 4As shown, it is arranged on the outside of the vacuum furnace, and includes an induction switch 54, an induction sheet 53, a magnet 55, a detection rod 50, a balance block 51, and a collision block 52; the induction switch 54 is installed on a mounting seat 56 on the outside of the vacuum furnace, and the induction sheet 53 is connected to the induction switch 54. The induction sheet 53 and the induction switch 54 are both existing technologies, and the induction sheet 53 is a conductive metal sheet; the detection rod 50 is inserted inside and outside the vacuum furnace chamber, and the balance block 51 is arranged at one end of the detection rod 50 that penetrates into the chamber, and the induction sheet 53 is arranged at the other end of the detection rod 50, that is, the end that passes out of the chamber; the collision block 52 is arranged on the side of the material cart 2 close to one end of the detection rod 50; the magnet 55 is arranged on the mounting seat 56, and the magnet 55 provides a restoring force for the induction sheet 53, so that the induction sheet 53 returns to its initial position; the contact transition surface between the collision block 52 and the balance block 51 is an arc surface. When the material cart 2 is traveling, the collision block 52 presses against the balance block 51, and the balance block 51 drives the detection rod 50 and the sensor sheet 53 to rotate a certain angle around the detection rod 50. The induction switch 54 detects the signal and transmits it to the controller to control the material cart to stop. At this time, each vacuum chamber starts the designated operation. After the operation of each vacuum chamber is completed, the material cart moves forward or backward, and the collision block 52 is separated from the balance block 51. The sensor sheet 53 is reset under the action of the deadweight of the balance block 51, and the cylindrical magnet 55 simultaneously sucks it firmly to prevent the sensor sheet 53 from swinging. The detection positioning mechanism 5 completes the positioning and parking function of the material cart 2, so that the material cart 2 stops at the predetermined position with accurate positioning, thereby realizing the automated operation of each chamber.

[0037] Each of the above chambers is also provided with an independent door, which is convenient for engineers to enter the room to solve problems that may arise during the welding process. The independent door of the welding chamber 403 is also convenient for adjusting the alignment of the laser welding gun and the thermos cup, thereby improving the processing accuracy.

[0038] A vacuuming method using the vacuuming equipment for a thermos cup comprises the following steps:

[0039] S1: The thermos cup 300 to be processed is loaded on the material rack 6 of the material cart 2, and the inlet valve 70 is opened. The material cart 2 enters the pre-evacuation chamber 401 from the loading platform 100 via the track, and stops when it reaches the specified position. The material rack 6 is lifted up by the material lifting mechanism 4 and separated from the material cart 2. The material cart 2 returns to the pre-evacuation chamber 401, and the material lifting mechanism 4 drives the material rack 6 to descend and reset and close the inlet valve 70. The system detects that the inlet valve 70 is closed and starts the low-pressure pumping operation. When the vacuum degree reaches 4×10 2 Pa, speed up the vacuuming speed and start preheating at the same time. Turn off the heating after the temperature reaches 200 degrees. When the vacuum degree reaches 4×10 -1 Pre-pumping is completed at Pa;

[0040] S2: After the pre-evacuation is completed, the heating chamber valve 71 is opened, and the material lifting mechanism 4 of the pre-evacuation chamber 401 lifts the material rack 6. At the same time, the material cart of the heating chamber 402 enters the pre-evacuation chamber 401 through the track and stops. The material lifting mechanism 4 descends and places the material rack 6 on the material cart. The material rack 6 enters the heating chamber 402 with the material cart through the track and closes the heating chamber valve 71. At this time, the pre-evacuation chamber 401 repeats step S1; after the system detects and closes the heating chamber valve 71, it starts the high-pressure extraction operation and starts heating the temperature in the furnace to 450 degrees. When it is detected that the vacuum degree reaches 1×10 -3 Pa, keep the temperature at 450°C for 20 minutes to activate the getter;

[0041] S3: The welding chamber 403 and the heating chamber 402 start high vacuum operation synchronously, and the vacuum degree of the welding chamber 403 reaches 1×10 - 3 Pa, the temperature reaches 450 degrees and is maintained; after the getter is activated in step S2, the welding chamber valve 72 is opened, and the material cart with the material rack enters the welding chamber 403 via the track and stops for positioning, the material lifting mechanism 4 lifts the material rack 6 off the material cart 2, and the material cart 2 returns to the heating chamber 402, and the material lifting mechanism 4 drives the material rack 6 to descend and reset and close the welding chamber valve 72, and the heating chamber 402 repeats step S2; after the system detects and closes the welding chamber valve 72, the welding gun is reset, and welding is performed in sequence from the zero position according to the preset travel parameters (the preset travel parameters correspond to the placement interval of the thermos cup on the material rack), and the welding gun melts the welding ball and the vacuum hole of the thermos cup into one to complete the welding;

[0042] S4: After welding is completed, the cooling chamber valve 73 is opened, and the material rack 6 is lifted up by the material lifting mechanism of the welding chamber 403. At the same time, the material cart 2 of the cooling chamber 404 enters the welding chamber 403 via the track and stops, and the material lifting mechanism 4 descends to place the material rack 6 on the material cart 2. The material cart with the material rack enters the cooling chamber 404 via the track and closes the cooling chamber valve 73. At this time, the welding chamber 403 repeats step S3; after the system detects and closes the cooling chamber valve 73, it monitors the room temperature and indoor pressure of the cooling chamber 404. When the room temperature drops to 230 degrees, the inflation valve is opened to fill the cooling chamber 404 with air or nitrogen. When the indoor pressure is the same as the external pressure, the cooling is completed;

[0043] S5: After cooling is completed, the outlet valve 74 is opened, and the material cart with the material rack enters the unloading platform 200 via the track and stops. After unloading, the material cart 2 returns to the cooling chamber 404 and closes the outlet valve 74. At this time, the cooling chamber 404 repeats step S4, and the operation is continuous.

[0044] Embodiment 2: A visual scanning camera with a controllable movable setting may also be installed above the welding room in the above-mentioned embodiment 1. The visual scanning camera and the mechanism for controlling its movement are prior art. The movable mechanism of the visual scanning camera may include a transverse transmission mechanism and a longitudinal transmission mechanism, and the longitudinal transmission mechanism is arranged on the transverse transmission mechanism to realize free movement in the transverse and longitudinal directions.

[0045] In step S3 of the vacuuming method described in Example 1, after the system detects that the welding chamber valve is closed, before welding, the visual scanning camera scans the position to be welded through the transparent window, and according to the scanning results, the laser welding gun performs welding operations through the transparent window; the laser welding gun performs spot welding according to the scanning results of the visual scanning camera, and the welding accuracy is higher, which more effectively improves the welding process quality.

Claims

1. A vacuum evacuation equipment for a thermos cup, comprising a pre-evacuation chamber (401), a heating chamber (402), a welding chamber (403) and a cooling chamber (404) arranged in sequence, wherein adjacent chambers are connected or isolated by a plug valve that can move up and down, a material continuous conveying device is provided at the bottom of each chamber, and the pre-evacuation chamber (401), the heating chamber (402) and the welding chamber (403) are all provided with a heating device, characterized in that: The invention also comprises a laser welding device (9) which is controllably arranged above the welding chamber (403); the top surface of the welding chamber (403) is provided with at least one transparent window (10), and the laser beam of the laser welding device (9) passes through the transparent window (10) to melt the welding ball arranged at the center hole of the cup bottom; the heating chamber (402) and the welding chamber (403) are both connected to a high vacuum exhaust system, and the pre-exhaust chamber (401) and the cooling chamber (404) are both connected to a low vacuum exhaust system; an inlet valve (70) which can be moved up and down is provided at the inlet of the pre-exhaust chamber (401), and an outlet valve (74) which can be moved up and down is provided at the outlet of the cooling chamber (404). ); the material continuous conveying device comprises a track (1) respectively arranged at the bottom of each chamber, a transmission mechanism (3) arranged outside each chamber, a material cart (2) controllably arranged on the track (1), a material rack (6) placed on the material cart (2) for placing a thermos cup, a detection positioning mechanism (5) arranged at each chamber, and a material lifting mechanism (4); the transmission mechanism (3) controls the material cart (2) to travel along the track (1), and the transmission mechanism (3) comprises a transmission shaft assembly connected to a power source, a transmission gear (34) arranged at the rear end of the transmission shaft assembly, and a rack (20) arranged at the bottom of the material cart (2) and cooperating with the transmission gear (34) for transmission; the material lifting mechanism (4) is arranged below the material rack (6) and lifts the material rack (6) off the material cart (2).

2. The vacuum evacuation equipment for a thermos cup according to claim 1, characterized in that: The device also includes a visual scanning camera (11) which is controllably arranged above the welding chamber (403).

3. The vacuum evacuation equipment for a thermos cup according to claim 1, characterized in that: The transparent window (10) is made of high temperature resistant glass; the visible range of the transparent window (10) covers all the thermos cups; the number of the transparent windows is the same as the number of all the thermos cups and corresponds one to one; the transparent windows are all square with a side length of 30 to 60 mm or circular with a diameter of 30 to 60 mm.

4. The vacuum evacuation equipment for a thermos cup according to claim 1, characterized in that: The detection positioning mechanism (5) comprises an induction switch (54) arranged outside the chamber, an induction sheet (53) connected to the induction switch (54) signal, a detection rod (50) fixed to the induction sheet (53) at one end, a balance block (51) arranged at one end of the detection rod (50) penetrating into the chamber, a collision block (52) arranged on the side of the material vehicle (2) close to one end of the balance block (51), and a magnet (55) providing a restoring force for the induction sheet (53); the contact transition surface between the collision block (52) and the balance block (51) is an arc surface, and after the balance block (51) contacts the collision block (52), the induction switch (54) is turned on or off through the rotational deformation of the induction sheet (53), thereby controlling the stopping or running of the material vehicle (2).

5. The vacuum evacuation equipment for a thermos cup according to claim 1, characterized in that: The material pushing mechanisms (4) are arranged at intervals; tracks corresponding to the tracks of the material continuous conveying device are provided on the loading platform (100) in front of the pre-evacuation chamber (401) and the unloading platform (200) behind the cooling chamber (404); and at least three pairs of wheels (21) are provided at the bottom of the material cart (2).

6. The vacuum evacuation equipment for a thermos cup according to claim 1, characterized in that: Each group of material lifting mechanisms (4) is symmetrically arranged on the outside of the track (1); the edge of the material rack (6) extends out of the edge of the material cart (2); the material lifting mechanism (4) includes a lifting rod located below the edge of the material rack (6), and the lifting rod is connected to a power source. Under the action of the power source, the lifting rod lifts the edge of the material rack (6) to lift the material rack (6) from the material cart (2).

7. The vacuum evacuation equipment for a thermos cup according to any one of claims 1 to 6, characterized in that: The material rack (6) is provided with a positioning fixture (8) for placing a thermos cup, and the positioning fixture (8) and the material rack (6) are connected in a plug-in manner.

8. A vacuuming method for vacuuming equipment for a thermos cup, characterized in that: The vacuum evacuation equipment for a thermos cup according to claim 5 is provided, and the following steps are performed: S1: Open the inlet valve, the material rack loaded with the thermos cup enters the designated position of the low vacuum pre-evacuation chamber from the loading platform through the material cart via the track and stops, the material rack is lifted up by the material lifting mechanism and separated from the material cart, the material cart exits the low vacuum pre-evacuation chamber and returns to the loading platform, the material lifting mechanism drives the material rack to descend and reset and close the inlet valve, the system detects that the inlet valve is closed and starts the low vacuum operation, when the vacuum degree reaches 4×10 2 Pa, speed up the vacuuming and start preheating. Turn off the heating after the temperature reaches 200 degrees. When the vacuum degree reaches 1×10 -1 Pre-pumping is completed at Pa; S2: After the pre-evacuation is completed, the gate valve of the heating chamber is opened, and the material rack is lifted up by the material lifting mechanism of the low vacuum pre-evacuation chamber. At the same time, the material cart of the high vacuum heating chamber enters the low vacuum pre-evacuation chamber via the track and stops. The material lifting mechanism descends and places the material rack on the material cart. The material cart with the material rack enters the high vacuum heating chamber via the track and closes the gate valve of the heating chamber. At this time, the low vacuum pre-evacuation chamber repeats step S1; after the system detects and closes the valve of the heating chamber, the high vacuum operation starts and the temperature in the furnace starts to be heated to 450 degrees. When the vacuum degree reaches 1×10 -3 Pa, keep the temperature at 450°C for 20 minutes to activate the getter; S3: The high vacuum insulation welding chamber and the high vacuum heating chamber start high vacuum pumping operation simultaneously, and the vacuum degree of the high vacuum insulation welding chamber reaches 1×10 -3 Pa, the temperature reaches 450 degrees and is maintained; after the getter is activated in step S2, the gate valve of the welding chamber is opened, and the material cart with the material rack enters the high vacuum insulation welding chamber via the track and stops for positioning, and the material rack is lifted up and separated from the material cart by the material cart, and the material cart returns to the high vacuum heating chamber, and the material rack is driven down by the material rack to reset and close the welding chamber valve, and the high vacuum heating chamber repeats step S2 at this time; after the system detects and closes the gate valve of the welding chamber, the position of the laser welding gun of the laser welding device is reset to zero, and welding is performed in sequence from the zero position through the transparent window according to the preset travel parameters, and the preset travel parameters correspond to the placement interval of the insulation cup on the material rack, and the laser welding gun melts the welding ball and the vacuum hole of the insulation cup into one to complete the welding; S4: After welding is completed, open the gate valve of the cooling chamber, the material rack is lifted up by the material lifting mechanism of the high vacuum insulation welding chamber, and the material cart of the low vacuum cooling chamber enters the high vacuum insulation welding chamber via the track and stops, the material lifting mechanism descends and places the material rack on the material cart, the material cart with the material rack enters the low vacuum cooling chamber via the track and closes the gate valve of the cooling chamber, and the high vacuum insulation welding chamber repeats step S3; after the system detects and closes the gate valve of the cooling chamber, monitor the room temperature and indoor pressure of the cooling chamber, when the room temperature drops to 230 degrees, open the inflation valve, fill the cooling chamber with air or nitrogen, and when the indoor pressure is the same as the external pressure, the cooling is completed; S5: After cooling is completed, the outlet valve is opened, and the material cart with the material rack enters the unloading platform via the track and stops. After unloading, the material cart returns to the low vacuum cooling chamber and closes the outlet valve. At this time, the low vacuum cooling chamber repeats step S4.

9. The vacuuming method of the vacuum evacuation equipment for the thermos cup according to claim 8, characterized in that: In step S3, before welding, the laser welding device controls the visual scanning camera above the welding room to scan the welding positions of all the thermos cups through the transparent window, and the laser welding gun performs fixed-point welding through the transparent window according to the visual scanning result, so that the welding ball and the vacuum hole of the thermos cup are melted into one to complete the welding.

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