A working chamber structure for a formic acid furnace

Abstract

This application provides a working chamber structure for a formic acid furnace, relating to the field of formic acid furnace technology. The working chamber structure for a formic acid furnace includes a fixed box, with cylinders fixedly connected to all four sides of the fixed box, and a formic acid tank fixedly connected to the top of the fixed box. A welding station for welding metal products inside the formic acid furnace is fixedly connected to the top of the formic acid tank, and a sealing cover is provided on the welding station. Two sets of cylinders are equipped with feeding and discharging components that cooperate with the formic acid tank, welding station, and sealing cover for feeding and discharging. Two other sets of cylinders are equipped with temperature control components that cooperate with the temperature regulation of the formic acid tank, welding station, and sealing cover. By combining quantitative feeding and discharging with precise temperature control, high-quality welding operations are performed on metal products and formic acid vapor within the working chamber structure of the formic acid furnace, improving the sufficiency of the oxidation-reduction reaction and the quality of the weld joints.

Description

Technical Field

[0001] This invention belongs to the field of formic acid furnace technology, and particularly relates to a working cavity structure for a formic acid furnace. Background Technology

[0002] A formic acid furnace is a reflow oven specifically designed for the electronics manufacturing industry. It is mainly used in the reflow soldering process to reduce oxidation and improve solder joint quality using formic acid vapor. Especially in fluxless soldering applications, the working chamber structure inside the formic acid furnace is used to perform formic acid soldering operations on the metal products that have been transported to the furnace.

[0003] In the prior art (patent application CN221603639U, entitled "A Working Chamber Structure for a Formic Acid Furnace"), by simultaneously arranging heating and cooling components within the working chamber, and also providing vacuum pipes, formic acid pipes, and nitrogen pipes connected to the working chamber, the product can directly complete preheating, heating, and cooling operations within the working chamber, improving production efficiency and product quality while reducing the space occupied by the formic acid furnace. However, in implementing this technical solution, at least the following problems were found in the prior art.

[0004] During the formic acid welding of metal products in the working chamber structure of the formic acid furnace, manual intervention is often required to inject formic acid vapor into the welding space of the metal products. This causes an oxidation-reduction reaction between the metal products and the formic acid vapor during the welding process, which is intended to improve the quality of the weld. However, the temperature control conditions at the welding site cannot be accurately and sensitively guaranteed, which affects the quality of the weld. Summary of the Invention

[0005] This application aims to at least address one of the technical problems in the prior art where the combination of quantitative feeding and precise temperature control is insufficient for high-quality welding of metal products and formic acid vapor within the working chamber of a formic acid furnace, leading to incomplete oxidation-reduction reactions and affecting weld quality. Therefore, this application proposes a working chamber structure for a formic acid furnace.

[0006] To achieve the above objectives, the specific technical solution of the present invention is as follows: A working chamber structure for a formic acid furnace includes a fixed box, with cylinders fixedly connected to all four sides of the fixed box, and a formic acid tank fixedly connected to the top of the fixed box. The top of the formic acid tank is fixedly connected to a welding table for welding metal products inside the formic acid furnace, and a sealing cover is provided on the welding table. The two sets of cylinders are equipped with feeding and discharging components that cooperate with the formic acid tank, welding table and sealing cover for feeding and discharging. The feeding and discharging components include a double-headed motor fixed to the bottom of the inner cavity of the fixed box. The other two sets of cylinders are equipped with temperature control components that work in conjunction with the temperature regulation of the formic acid tank, welding station and sealing cover, and the temperature control components include a small integrated heating and cooling unit fixed on a fixed box.

[0007] Preferably, the feeding and discharging assembly further includes a cam frame fixed on one output shaft of a dual-head motor, and push rod frames are rotatably connected around the cam frame. A piston head that slides with the cylinder is fixedly connected to the outer side of the push rod frame, and a return spring is sleeved on the outer surface of the push rod frame. A first three-way valve is connected to the two sets of cylinders, and the inlet of the first three-way valve is connected to a feeding pipe that is connected with the formic acid tank. The outlet of the first three-way valve is connected to a first telescopic pipe, and the top end of the first telescopic pipe is connected to a discharge head that is connected with the welding table and the sealing cover for discharging and discharging.

[0008] Preferably, the temperature control component further includes a four-way valve that is unidirectionally connected to the outside of the small integrated heating and cooling unit, and the top of the four-way valve is connected to a pressure pipe. The top of the pressure pipe is connected to a second three-way valve, and the top of the second three-way valve is connected to a second telescopic pipe. The top of the second telescopic pipe is connected to a main conveying head that cooperates with the temperature control of the welding station and the sealing cover. The inner end of the second three-way valve is connected to a secondary conveying head that is embedded and cooperates with the formic acid tank. The secondary conveying head is connected to an electric control valve, and the inner cavity of the formic acid tank has an insulation cavity that communicates and cooperates with the secondary conveying head.

[0009] Preferably, the inner walls of the first three-way valve, the feed pipe, the first telescopic pipe, and the discharge head are all coated with anti-corrosion paint.

[0010] Preferably, the outer end of the first three-way valve is equipped with a metering sensor, and the discharge head adopts a large-diameter discharge port design.

[0011] Preferably, the small integrated cooling and heating unit and the four-way valve are connected by a delivery pipe with a one-way valve, and the small integrated cooling and heating unit is equipped with a digital display panel.

[0012] Preferably, the outer end of the four-way valve is connected to an air inlet pipe with an embedded filter screen, and an air inlet valve is provided on the air inlet pipe.

[0013] Preferably, a temperature sensor is embedded at the outer end of the second three-way valve, and the insulation chamber is not interconnected with the feed pipe.

[0014] Preferably, the welding platform has a sealing groove that engages with the sealing cover, and a concentration sensor is embedded in the top of the sealing cover.

[0015] Preferably, the sealing cover is fixedly connected to a frame that is fixedly matched with the discharge head and the main conveyor head on all four sides, and tempered glass is embedded in all four sides of the sealing cover near the frame.

[0016] The working chamber structure for a formic acid furnace according to the present invention has the following advantages: 1. The working chamber structure for a formic acid furnace is first driven by a dual-head motor, which drives the piston heads on four push rod frames to reciprocate within four sets of cylinders via a cam frame. The negative pressure suction generated in two sets of cylinders draws formic acid vapor from the formic acid tank through the feed pipes on two sets of first three-way valves. The vapor is then supplied to the welding station area within the sealed cover by the discharge heads on two first telescopic pipes, ensuring a quantitative feed and discharge of material to the metal products being welded on the welding station. This forces the metal products to undergo a full oxidation-reduction reaction with the quantitatively supplied formic acid vapor during welding, thereby improving the quality of the weld joints.

[0017] 2. This working chamber structure for a formic acid furnace, simultaneously, two sets of small integrated heating and cooling units supply heat sources to two sets of four-way valves according to the current reaction temperature requirements of the welding site. At the same time, the booster pressure generated in the other two sets of cylinders forces the heat sources in the two sets of four-way valves to be pressurized through two pressurizing pipes and then supplied to two sets of second three-way valves. Immediately afterwards, the main conveying heads on the two second telescopic pipes supply the heat to the welding table area inside the sealed cover, providing precise and sensitive temperature control conditions for the metal products being welded on the welding table, so that the oxidation-reduction reaction between the metal products and the quantitatively supplied formic acid vapor is more complete, further improving the weld quality of the metal products.

[0018] 3. This working chamber structure for a formic acid furnace, during which the opening and closing of the electrically controlled valves on the two auxiliary conveyor heads are controlled according to the temperature inside the formic acid furnace, and after the metal products have completed the formic acid welding operation, and when the temperature inside the formic acid furnace exceeds the boiling point temperature of the formic acid vapor in the formic acid tank, the two sets of small integrated heating and cooling units are controlled to provide a cold source, and the cold source in the two sets of four-way valves is sequentially supplied to the welding table area inside the sealed cover through two pressurizing pipes, second three-way valves, two second telescopic pipes and the main conveyor head, so as to quickly cool down the metal products after welding. At the same time, the two sets of second three-way valves supply the cold source into the insulation chamber inside the formic acid tank through the two auxiliary conveyor heads to cool down the formic acid vapor in the formic acid tank, so as to prevent the formic acid vapor from being overheated and volatilizing, and reduce the waste of formic acid vapor. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a structural diagram of the working chamber of a formic acid furnace according to the present invention, showing its working state. Figure 2 This is an initial state diagram of the working cavity structure for a formic acid furnace according to the present invention; Figure 3 This is a partial cross-sectional view of the working cavity structure for a formic acid furnace according to the present invention; Figure 4 This is a partial internal view of the working cavity structure for a formic acid furnace according to the present invention; Figure 5 This is a front view of the cylinder barrel, feed and exhaust assembly, and temperature control assembly of the present invention; Figure 6 This is a partial top cross-sectional view of the cylinder barrel and feed / exhaust assembly structure of the present invention in a pressurized state. Figure 7 This is a partial top cross-sectional view of the cylinder barrel and feed / exhaust assembly structure under negative pressure conditions according to the present invention. Figure 8 This is a partial side cross-sectional view of the cylinder barrel, formic acid tank, sealing cover and feed-out assembly of the present invention. Figure 9 This is a partial front view of the feeder assembly structure of the present invention; Figure 10 This is a partial side cross-sectional view of the structure of the cylinder barrel, formic acid tank, sealing cover and temperature control component of the present invention. Figure 11 This is a partial bottom view of the temperature control component structure of the present invention; Figure 12 This is a front view of the initial state of the sealing cover and lifting assembly structure of the present invention; Figure 13 This is a bottom view of the sealing cover and lifting assembly structure of the present invention in the lifting state; Figure 14 This is an exploded bottom view of the lifting component structure of the present invention; Figure 15 The diagram shows the bottom view of the structure of the fixed box, cylinder barrel, formic acid tank, welding table and sealing cover of the present invention.

[0021] Explanation of markings in the diagram: 1. Fixed box; 2. Cylinder barrel; 3. Formic acid tank; 4. Welding table; 5. Sealing cover; 6. Feeding and discharging assembly; 61. Dual-head motor; 62. Cam frame; 63. Push rod frame; 64. Piston head; 65. Return spring; 66. First three-way valve; 67. Feeding pipe; 68. First telescopic pipe; 69. Discharge head; 7. Temperature control assembly; 71. Small integrated cooling and heating unit; 72. Four-way valve; 73. Pressurization pipe; 74. Second three-way valve; 7 5. Second telescopic tube; 76. Main conveying head; 77. Auxiliary conveying head; 78. Electrically controlled valve; 79. Insulation chamber; 8. Lifting assembly; 81. Electric push rod; 82. Positioning head; 83. Gear ring; 84. Bracket; 85. Positioning groove; 86. Gear; 87. Threaded rod; 88. Threaded cylinder; 89. Extension rod; 9. Circular slide rail; 10. Support slider; 11. Metering sensor; 12. Temperature sensor; 13. Sealing groove; 14. Concentration sensor. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments: like Figures 1-15 As shown, a working chamber structure for a formic acid furnace according to the present invention includes a fixed box 1, with cylinders 2 fixedly connected to all four sides of the fixed box 1, and a formic acid tank 3 fixedly connected to the top of the fixed box 1; a welding table 4 for welding metal products inside the formic acid furnace is fixedly connected to the top of the formic acid tank 3, and a sealing cover 5 is provided on the welding table 4. A sealing groove 13 is provided on the welding table 4 to engage with the sealing cover 5, thereby sealing the welding table 4 and the sealing cover 5 to prevent air leakage. A concentration sensor 14 is embedded in the top of the sealing cover 5 to monitor the concentration of formic acid vapor entering the sealing cover 5 in real time. Two sets of cylinders 2 are equipped with feeding and discharging components 6 that work in conjunction with the formic acid tank 3, welding station 4, and sealing cover 5. The feeding and discharging components 6 include a double-headed motor 61 fixed to the bottom of the inner cavity of the fixed box 1, which provides a quantitative feeding and discharging guarantee for the metal products being welded on the welding station 4, forcing the metal products to undergo a full oxidation-reduction reaction with the quantitatively supplied formic acid vapor during welding, thereby improving the quality of the weld joint. The other two sets of cylinders 2 are equipped with temperature control components 7 that work in conjunction with the temperature control of the formic acid tank 3, welding station 4, and sealing cover 5. The temperature control components 7 include a small integrated heating and cooling machine 71 fixed on the fixed box 1, which provides precise and sensitive temperature control conditions for the metal products being welded on the welding station 4, making the oxidation-reduction reaction between the metal products and the quantitatively supplied formic acid vapor more complete, further improving the quality of the weld joint, and also preventing the formic acid vapor from being overheated and volatilizing, thus reducing the waste of formic acid vapor.

[0023] like Figures 5-11As shown, the feeding assembly 6 also includes a cam frame 62 fixed on one output shaft of the dual-head motor 61, and push rod frames 63 are rolled around the cam frame 62. A piston head 64, which slides with the cylinder 2, is fixedly connected to the outer side of the push rod frame 63. The dual-head motor 61 provides a unified drive source, and the cam frame 62 drives the piston heads 64 on the four push rod frames 63 to reciprocate within the four sets of cylinders 2. A return spring 65 is fitted on the outer surface of the push rod frame 63. A first three-way valve 66 is connected to two sets of cylinders 2, and the inlet of the first three-way valve 66 is connected to a feed pipe 6 that communicates with the formic acid tank 3. 7. The negative pressure suction generated in the two sets of cylinders 2 draws formic acid vapor from the formic acid tank 3 through the feed pipes 67 on the two sets of first three-way valves 66. The discharge port of the first three-way valve 66 is connected to the first telescopic pipe 68, and the top of the first telescopic pipe 68 is connected to the discharge head 69 that cooperates with the welding table 4 and the sealing cover 5 for material discharge. The discharge head 69 on the two first telescopic pipes 68 supplies material into the welding table 4 area inside the sealing cover 5, providing a quantitative material discharge guarantee for the metal products being welded on the welding table 4, forcing the metal products during welding to undergo a full oxidation-reduction reaction with the quantitatively supplied formic acid vapor, thereby improving the quality of the weld joint. The inner walls of the first three-way valve 66, feed pipe 67, first telescopic pipe 68, and discharge head 69 are all coated with anti-corrosion paint, which prevents corrosion and avoids formic acid vapor from eroding the inner walls of these components, thus extending their service life. A metering sensor 11 is embedded at the outer end of the first three-way valve 66 to quantitatively process the formic acid vapor passing through it. The discharge head 69 adopts a large-diameter discharge port design, which facilitates the large-scale discharge of formic acid vapor and prevents turbulence at the discharge head 69.

[0024] The temperature control component 7 also includes a four-way valve 72 connected unidirectionally to the outside of the small integrated cooling and heating unit 71. The two small integrated cooling and heating units 71 supply the generated heat source to the two four-way valves 72 according to the current welding site temperature requirements. A pressure pipe 73 is connected to the top of each four-way valve 72, and a second three-way valve 74 is connected to the top of each pressure pipe 73. Furthermore, the boosting pressure generated within the two sets of cylinders 2 forces the heat source in the two four-way valves 72 to be pressurized through the two pressure pipes 73 before being supplied to the two second three-way valves 74. Inside, the top of the second three-way valve 74 is connected to a second telescopic pipe 75, and the top of the second telescopic pipe 75 is connected to a main conveying head 76 that cooperates with the temperature control of the welding table 4 and the sealing cover 5. The main conveying head 76 on the two second telescopic pipes 75 supplies the welding table 4 area inside the sealing cover 5, providing precise and sensitive temperature control conditions for the metal products undergoing welding on the welding table 4, so that the oxidation-reduction reaction between the metal products and the quantitatively supplied formic acid vapor is more complete, and further improves the weld quality of the metal products. Furthermore, the inner end of the second three-way valve 74 is connected to an auxiliary conveying head 77 that is embedded and cooperates with the formic acid tank 3. An electrically controlled valve 78 is connected to the auxiliary conveying head 77. Based on the temperature inside the formic acid furnace, the electrically controlled valves 78 on the two auxiliary conveying heads 77 are controlled to open and close. The inner cavity of the formic acid tank 3 has an insulation cavity 79 that communicates and cooperates with the auxiliary conveying heads 77. After the formic acid welding operation on the metal products is completed, and when the temperature inside the formic acid furnace exceeds the boiling point temperature of the formic acid vapor inside the formic acid tank 3, two sets of small integrated heating and cooling units 71 are controlled to provide a cooling source. The cold source from the two sets of four-way valves 72 is sequentially supplied to the welding station 4 area inside the sealing cover 5 through two pressurizing pipes 73, the second three-way valve 74, two second telescopic pipes 75 and the main conveyor head 76 to rapidly cool down the metal products after welding. At the same time, the cold source is supplied to the insulation chamber 79 inside the formic acid tank 3 through the two sets of second three-way valves 74 and two auxiliary conveyor heads 77 to cool down the formic acid vapor inside the formic acid tank 3, so as to prevent the formic acid vapor from being overheated and volatilizing, and reduce the waste of formic acid vapor. The small integrated cooling and heating unit 71 and the four-way valve 72 are connected by a delivery pipe with a one-way valve to prevent backflow of the heat or cold source supplied by the small integrated cooling and heating unit 71 into the four-way valve 72. The small integrated cooling and heating unit 71 is equipped with a digital display panel for real-time display of the current heat or cold source supply and temperature. The outer end of the four-way valve 72 is connected to an intake pipe with an embedded filter, and an intake valve is installed on the intake pipe to provide intake compensation for the other two sets of cylinders 2. The outer end of the second three-way valve 74... A temperature sensor 12 is embedded to monitor the temperature of the heat source or cold source passing through the second three-way valve 74 in real time. The insulation chamber 79 and the feed pipe 67 are not interconnected to prevent the cold source in the insulation chamber 79 from leaking into the feed pipe 67, and also to prevent the formic acid vapor in the feed pipe 67 from leaking into the insulation chamber 79. The sealing cover 5 is fixedly connected to the frame around its perimeter, which is fixedly matched with the discharge head 69 and the main conveyor head 76. Tempered glass is embedded around the sealing cover 5 near the frame to facilitate observation of the working conditions inside the sealing cover 5 from outside the formic acid furnace.

[0025] like Figures 12-14 As shown, during the welding of metal products using formic acid vapor in the working chamber structure of the formic acid furnace, it is necessary to ensure the sealing of the metal product welding site to prevent formic acid vapor leakage and temperature loss. Such sealing measures are mostly operated by manually opening and closing the sealing cover, which is prone to incomplete sealing. The fixed box 1 is equipped with lifting components 8 around its perimeter, which are used in conjunction with the sealing cover 5 on the welding table 4. The lifting components 8 include an electric push rod 81 embedded in another output shaft of the double-head motor 61. The piston rod of the electric push rod 81 is fixedly connected to a positioning head 82. The top of the inner cavity of the fixed box 1 is provided with an annular slide rail 9. The inner cavity of the annular slide rail 9 is slidably connected to a support slider 10. The bottom of the support slider 10 is fixedly connected to a toothed ring 83. The annular slide rail 9 and the support slider 10 provide rotational support for the toothed ring 83. A bracket 84 is fixedly connected to the inner side of the gear ring 83, and a positioning groove 85 for use with the positioning head 82 is opened at the bottom of the bracket 84. An electric push rod 81 adjusts the engagement stroke of the positioning head 82 and the positioning groove 85. Gears 86 that rotate with the fixed box 1 are meshed around the gear ring 83, and a threaded rod 87 is fixedly connected to the top of the gears 86. A threaded cylinder 88 that passes through the welding table 4 is threadedly connected to the threaded rod 87, and an extension that rotates with the sealing cover 5 is provided on the threaded cylinder 88. The extension rod 89 and the dual-head motor 61 drive the gear ring 83 on the bracket 84 to rotate forward or backward through the positioning head 82 that is snapped into place. The gear ring 83 drives the threaded rods 87 on the four sets of gears 86 to rotate accordingly. The four threaded rods 87 drive the extension rods 89 on the four threaded cylinders 88 to perform lifting and lowering actions, opening and closing the sealing cover 5 on the welding table 4, and achieving an automatic sealing effect on the welding space on the welding table 4. This facilitates the high-quality welding of metal products by the formic acid furnace working chamber structure using formic acid vapor.

[0026] The working principle of a working chamber structure for a formic acid furnace is as follows: First, the metal product to be welded is placed on the welding table 4. Then, the electric push rod 81 is opened and the positioning head 82 is moved up and locked into the positioning groove 85 at the bottom of the bracket 84. With the rotational support of the ring slide rail 9 and the support slider 10 on the gear ring 83, the double-head motor 61 is opened and the gear ring 83 on the bracket 84 is rotated through the locked positioning head 82. The gear ring 83 drives the threaded rods 87 on the four sets of gears 86 to rotate in the forward direction. The four threaded rods 87 drive the four threaded cylinders 88 and the extension rods 89 to move down synchronously. The four extension rods 89 drive the sealing cover 5 to move down and lock into the sealing groove 13 on the welding table 4. After the sealing cover 5 seals the welding space on the welding table 4, the double-head motor 61 is stopped and the electric push rod 81 is closed and the positioning head 82 is moved down and disengaged from the positioning groove 85 at the bottom of the bracket 84 to the initial position. Next, the dual-head motor 61 is restarted and drives the cam frame 62 to rotate at high speed. With the elastic buffering and reset of the piston heads 64 on the four push rod frames 63 by the four return springs 65, the cam frame 62 drives the piston heads 64 on the four push rod frames 63 to reciprocate in the four sets of cylinders 2. The negative pressure generated by the piston heads 64 in the return stroke intake state in two sets of cylinders 2 draws the formic acid vapor from the formic acid tank 3 through the feed pipes 67 on the two sets of first three-way valves 66. The increased pressure generated by the piston head 64 in the process of exhausting forces the inhaled formic acid vapor to be supplied into the sealed cover 5 in the sealed state through the discharge head 69 on the two first telescopic pipes 68. Two sets of metering sensors 11 quantitatively detect the formic acid vapor passing through the two sets of first three-way valves 66, and the concentration sensor 14 monitors the concentration of formic acid vapor in the sealed cover 5 in real time. Then, the quantitative formic acid vapor supplied into the sealed cover 5 undergoes an oxidation-reduction reaction with the metal products in the welding state on the welding table 4. Meanwhile, the heat source is first generated by two sets of small integrated heating and cooling units 71 and supplied unidirectionally into two sets of four-way valves 72. Then, the boosting pressure generated by the piston heads 64 in the process exhaust state in the other two sets of cylinders 2 pressurizes the heat source in the two sets of four-way valves 72 and supplies it into two pressurizing pipes 73 for secondary pressurization. The pressurized heat source is then supplied into the sealed cover 5 in a sealed state through the second telescopic pipes 75 on the two sets of second three-way valves 74 and the two sets of main conveying heads 76. The temperature of the pressurized heat source in the two sets of second three-way valves 74 is monitored in real time by two sets of temperature sensors 12 to provide suitable temperature control conditions for the metal products in the welding and oxidation-reduction reaction state. The electric control valves 78 on the two sets of auxiliary conveying heads 77 are closed until the metal products on the welding table 4 complete the oxidation-reduction and welding operations. After the metal products on the welding table 4 have completed the oxidation-reduction and welding operations, the electric control valves 78 on the two sets of auxiliary conveying heads 77 are opened, and the two sets of small integrated heating and cooling units 71 are controlled to generate a cold source. Similarly, the cold source pressurized in the two sets of four-way valves 72 is supplied to the sealed cover 5 in a sealed state through the second telescopic pipes 75 on the two sets of second three-way valves 74 and the main conveying head 76. This rapidly cools the metal products after the welding and oxidation-reduction reactions are completed, and the sealed cover 5 is controlled to move upward and detach from the welding table 4 to remove the metal products after welding. This process is repeated for the next set of metal products to be subjected to formic acid welding. At the same time, the pressurized cold source in the two sets of second three-way valves 74 is also supplied into the insulation cavity 79 in the formic acid tank 3 by the two sets of auxiliary conveying heads 77 in the open state. The temperature of the pressurized cold source passing through the two sets of second three-way valves 74 is monitored in real time by two sets of temperature sensors 12. The cold source supplied into the insulation cavity 79 forces the temperature of the formic acid vapor in the formic acid tank 3 to drop, so as to prevent the formic acid vapor in the formic acid tank 3 from volatilizing due to the high temperature in the formic acid furnace.

[0027] It should be noted that the specific model specifications of the dual-head motor 61 and the small integrated cooling and heating unit 71 need to be selected and determined according to the actual specifications of the device. The specific selection calculation method adopts the existing technology in this field, so it will not be elaborated in detail.

[0028] The power supply circuits for the dual-head motor 61, the small integrated heating and cooling unit 71, and various valves and sensors are clear to those skilled in the art and will not be described in detail here.

[0029] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A working chamber structure for a formic acid furnace, comprising a fixed box (1), characterized in that: The fixed box (1) is fixedly connected to cylinders (2) on all four sides, and a formic acid tank (3) is fixedly connected to the top of the fixed box (1). The top of the formic acid tank (3) is fixedly connected to a welding table (4) for welding metal products in the formic acid furnace, and a sealing cover (5) is provided on the welding table (4). The two sets of cylinders (2) are provided with feeding and discharging components (6) that cooperate with the formic acid tank (3), welding table (4) and sealing cover (5) for feeding and discharging. The feeding and discharging components (6) include a double-headed motor (61) fixed to the bottom of the inner cavity of the fixed box (1). The other two sets of cylinder barrels (2) are equipped with temperature control components (7) that cooperate with the temperature control of the formic acid tank (3), welding station (4) and sealing cover (5), and the temperature control components (7) include a small integrated heating and cooling unit (71) fixed on the fixed box (1).

2. The working chamber structure for a formic acid furnace according to claim 1, characterized in that: The feeding and discharging assembly (6) also includes a cam frame (62) fixed on one output shaft of a dual-head motor (61), and push rod frames (63) are rolled around the cam frame (62). A piston head (64) that slides with the cylinder (2) is fixedly connected to the outside of the push rod frame (63), and a return spring (65) is sleeved on the outer surface of the push rod frame (63). A first three-way valve (66) is connected to the two sets of cylinders (2), and the inlet of the first three-way valve (66) is connected to a feeding pipe (67) that is connected with the formic acid tank (3). The outlet of the first three-way valve (66) is connected to a first telescopic pipe (68), and the top of the first telescopic pipe (68) is connected to a discharge head (69) that is connected with the welding table (4) and the sealing cover (5) for feeding and discharging.

3. The working chamber structure for a formic acid furnace according to claim 2, characterized in that: The temperature control component (7) also includes a four-way valve (72) that is unidirectionally connected to the outside of the small integrated heating and cooling unit (71), and the top of the four-way valve (72) is connected to a pressure pipe (73), the top of the pressure pipe (73) is connected to a second three-way valve (74), and the top of the second three-way valve (74) is connected to a second telescopic pipe (75), the top of the second telescopic pipe (75) is connected to a main conveying head (76) that cooperates with the temperature control of the welding table (4) and the sealing cover (5), and the inner end of the second three-way valve (74) is connected to a secondary conveying head (77) that is embedded and cooperates with the formic acid tank (3), the secondary conveying head (77) is connected to an electric control valve (78), and the inner cavity of the formic acid tank (3) is provided with a heat preservation cavity (79) that is connected and cooperates with the secondary conveying head (77).

4. The working chamber structure for a formic acid furnace according to claim 3, characterized in that: The inner walls of the first three-way valve (66), the feed pipe (67), the first telescopic pipe (68), and the discharge head (69) are all coated with anti-corrosion paint.

5. The working chamber structure for a formic acid furnace according to claim 4, characterized in that: The outer end of the first three-way valve (66) is equipped with a metering sensor (11), and the discharge head (69) adopts a large-diameter discharge port design.

6. The working chamber structure for a formic acid furnace according to claim 5, characterized in that: The small integrated heating and cooling unit (71) and the four-way valve (72) are connected by a delivery pipe with a one-way valve, and the small integrated heating and cooling unit (71) is equipped with a digital display panel.

7. The working chamber structure for a formic acid furnace according to claim 6, characterized in that: The outer end of the four-way valve (72) is connected to an air inlet pipe with an embedded filter screen, and an air inlet valve is provided on the air inlet pipe.

8. The working chamber structure for a formic acid furnace according to claim 7, characterized in that: The outer end of the second three-way valve (74) is equipped with a temperature sensor (12), and the heat preservation cavity (79) is not connected to the feed pipe (67).

9. A working chamber structure for a formic acid furnace according to claim 8, characterized in that: The welding station (4) has a sealing groove (13) that engages with the sealing cover (5), and a concentration sensor (14) is embedded in the top of the sealing cover (5).

10. A working chamber structure for a formic acid furnace according to claim 9, characterized in that: The sealing cover (5) is fixedly connected to a frame that is fixedly matched with the discharge head (69) and the main conveyor head (76) around its perimeter, and tempered glass is embedded in the perimeter of the sealing cover (5) near the frame.

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