A spring-loaded assembly, a trolley-type resistance furnace, and a method thereof

Abstract

This invention belongs to the field of resistance furnace technology, specifically a spring-loaded assembly, a trolley-type resistance furnace, and a method thereof. Addressing problems in existing technologies such as heat loss, uneven heating, contact wear, and exhaust gas pollution, the invention proposes the following solutions: a bidirectional screw controls the lifting and lowering of the support platform; the insulation cloth automatically seals the furnace bottom when the trolley moves out; hot air flows evenly through a guide plate and air circulation structure; a limiting rod and trapezoidal groove are used to ensure precise contact between the contacts and contact plates; and an activated carbon filter purifies the exhaust gas. This solution reduces heat loss, improves heating uniformity, extends equipment life, and reduces environmental pollution, making it suitable for various industrial heating scenarios.

Description

Technical Field

[0001] This invention relates to the field of resistance furnace technology, and in particular to a spring-loaded assembly, a trolley-type resistance furnace, and a method thereof. Background Technology

[0002] A bogie-type resistance furnace is a common heat treatment equipment, widely used in processes such as heating, quenching, and tempering of metallic materials.

[0003] However, existing technologies have many shortcomings. When the trolley is removed, heat from the bottom of the resistance furnace is easily dissipated, resulting in energy waste and potential burns to workers; during the heating process, uneven hot air flow leads to uneven heating of the workpiece, affecting the heating quality; in the energized structure, the contacts and contact plates are prone to collision and twisting when they come into contact, reducing their service life; in addition, the exhaust gas generated by heating the workpiece is easily emitted directly into the outside world, polluting the air.

[0004] Therefore, in order to solve the above problems, this application proposes a spring-loaded assembly, a trolley-type resistance furnace, and a method. Summary of the Invention

[0005] The purpose of this invention is to solve the problems of heat loss, uneven heating, easy damage to contacts, and exhaust gas pollution in existing furnaces, and to propose a spring-loaded assembly, a trolley-type resistance furnace, and a method thereof.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A spring-loaded assembly, comprising:

[0008] Movable lever;

[0009] The first insulating sleeve and the second insulating sleeve are fixedly connected to one end of the first insulating sleeve, and both are slidably sleeved on the outer wall of the movable rod;

[0010] A spring is sleeved on the outer wall of the movable rod, and its two ends are respectively fixedly connected to the side of the first insulating sleeve away from the second insulating sleeve and the outer wall of the movable rod;

[0011] A copper core runs through the movable rod;

[0012] A brass contact piece is set in a groove at one end of the movable rod, and one end of the copper core is fixedly connected to the brass contact piece;

[0013] When the movable rod is moved by an external force, the spring is compressed to provide a buffer and make way, thus achieving flexible contact of the energized components.

[0014] In one possible design, the outer wall of the movable rod is threaded with a first bolt, which abuts against the side of the second insulating sleeve away from the first insulating sleeve, thereby limiting the return stroke of the movable rod.

[0015] The outer wall of the copper core is threaded with a second bolt, which abuts against the end of the movable rod away from the brass contact piece, and is used to fix the copper core and the brass contact piece inside the movable rod.

[0016] The brass contact piece has an arc-shaped groove on the side away from the second bolt to enhance the contact stability with the external contact.

[0017] The bogie-type resistance furnace, including the aforementioned spring-loaded assembly, also includes:

[0018] The resistance furnace body has resistance heating tubes fixed on the inner walls of its two mutually distant sides for heating the workpiece.

[0019] The trolley body is slidably set at the bottom of the resistance furnace body. The top of the trolley body cooperates with the bottom of the resistance furnace body to seal the bottom of the resistance furnace body when the trolley body moves under the resistance furnace body to prevent heat loss.

[0020] Two sets of energizing structures are used to energize the resistance heating tubes when the trolley body moves to the bottom of the resistance furnace body;

[0021] A closed structure is provided between the resistance furnace body and the trolley body to close the resistance furnace body when the trolley body moves out or in. The closed structure includes a rotating shaft rotatably disposed on one side of the resistance furnace body and a support platform slidably disposed in the trolley body for carrying workpieces.

[0022] as well as,

[0023] An air circulation structure is installed inside the resistance furnace body to uniformly heat the workpiece. The air circulation structure includes a fixed cylinder that penetrates the inner wall of the top of the resistance furnace body and two fans fixed on one side of the resistance furnace body.

[0024] In one possible design, the energizing structure includes a mounting plate fixed to the bottom of one side of the trolley body, with a contact fixedly extending through the mounting plate; an L-shaped plate is fixed to one side of the resistance furnace body, with a sliding groove in the L-shaped plate and a movable block slidably disposed within the sliding groove; a first insulating sleeve and a second insulating sleeve are both fixedly installed within the movable block; the contact is pluggable to a brass contact piece; when the trolley body moves to the bottom of the resistance furnace body and closes the bottom, the contact extends into the copper core and contacts the brass contact piece, and the contact pushes the movable rod to slide within the first and second insulating sleeves through the brass contact piece, while the spring is compressed, thereby preventing collision damage when the resistance heating tube is energized.

[0025] In one possible design, the enclosed structure further includes a bidirectional lead screw rotatably disposed within the trolley body. Two movable seats are threaded onto the outer wall of the bidirectional lead screw, with the two movable seats located on the forward and reverse threaded sections of the lead screw, respectively. Two guide rods are fixed within the trolley body, and both movable seats are slidably mounted on the guide rods. A connecting rod is rotatably connected to the top of each movable seat, with the top of the connecting rod rotatably connected to the bottom of the support platform. When the bidirectional lead screw rotates, the movable seats move in opposite directions and the support platform is raised or lowered via the connecting rods to heat the workpiece.

[0026] In one possible design, the rotating shaft is rotatably mounted between two bases on one side of the resistance furnace body. A winding cylinder is fixedly sleeved on the outer wall of the rotating shaft, and an insulating cloth of aluminum silicate fiber is wound around the outer wall of the winding cylinder. One end of the insulating cloth is fixedly connected to one side of the trolley body. Two boxes are rotatably sleeved on the outer wall of the rotating shaft. The boxes are fixed to one side of the bases, and coil springs are installed inside the boxes. One end of the coil springs is fixedly connected to the bases, and the other end is fixedly connected to the rotating shaft. The coil springs are pre-tensioned. When the trolley body moves to the bottom of the resistance furnace body, the coil springs drive the rotating shaft to reset and rotate to wind up the insulating cloth. When the trolley body moves out, the insulating cloth is pulled out to seal the bottom and prevent heat loss.

[0027] In one possible design, the air circulation structure further includes two diffuser cylinders fixed to the inner wall of one side of the electric resistance furnace body, with the exhaust end of the blower connected to the diffuser cylinders via a pipe; guide vanes are fixed to the inner walls of the two sides of the electric resistance furnace body that are far apart from each other, to guide the airflow towards the center; an intake cylinder is slidably fitted onto the outer wall of the fixed cylinder, forming a sealed gap between the intake cylinder and the fixed cylinder, and a trapezoidal block is fixed to the outer wall of the intake cylinder to maintain a gap with the workpiece; an L-shaped pipe is fixedly connected to the top of the fixed cylinder, extending into the placement box, which is fixed to the top of the electric resistance furnace body, and a screen plate is fixed inside the placement box, with the L-shaped pipe located below the screen plate; a cover plate is provided on the top of the placement box, and activated carbon is placed between the screen plate and the cover plate; two return air pipes are fixedly fixed on the side of the placement box away from the L-shaped pipe, and the return air pipes are fixedly connected to the air inlet end of the blower; when the blower is running, hot air is blown through the diffuser cylinders to the guide vanes, and then enters the placement box through the intake cylinder and the fixed cylinder, filtered by the activated carbon, and returned to the blower through the return air pipes, achieving uniform heating and heat energy circulation.

[0028] In one possible design, a closed door is rotatably connected to the side of the resistance furnace body away from the blower, with the bottom of the closed door flush with the top of the trolley body; a limit plate is fixed to one side of the trolley body, which contacts the closed door for limiting its position, thereby preventing heat loss when the closed door is closed and facilitating maintenance when it is open.

[0029] In one possible design, the movable block has a trapezoidal groove on the side near the mounting plate, and a limiting groove communicating with the trapezoidal groove is provided inside the movable block; a limiting rod is fixed on one side of the mounting plate; when the trolley body moves to below the resistance furnace body, the limiting rod inserts into the trapezoidal groove and slides into the limiting groove, so that the brass contact piece and the contact are coaxial, avoiding docking deviation.

[0030] The method of using the bogie-type resistance furnace in this application includes the following steps:

[0031] S1. Loading and lowering of workpiece: Place the workpiece to be heated on the support platform, start the motor to drive the bidirectional lead screw to rotate, drive the two moving seats to move in opposite directions, and then drive the support platform and workpiece to descend through the connecting rod, so that the workpiece is stored in the trolley body.

[0032] S2. Trolley Positioning and Furnace Bottom Sealing: Drive the electric wheels to move the trolley body along the track until it reaches the bottom of the resistance furnace body and cooperates with the resistance furnace body to seal the furnace bottom; during the movement, the trolley body drives the limit rod through the mounting plate to insert into the trapezoidal groove and limit groove at the bottom of the resistance furnace body to achieve precise positioning and make the conductive contact coaxial with the power supply piece; the conductive contact moves with the trolley and inserts into the power supply core to contact the power supply piece, pushing the movable rod to compress the spring and achieve buffer docking.

[0033] S3. Workpiece lifting and heating: The bidirectional lead screw rotates in opposite directions, driving the support platform and workpiece to rise into the resistance furnace body; the conductive contact connects with the power supply plate to energize and start the resistance heating tube to heat the workpiece.

[0034] S4. Hot air circulation and uniform heating: Start the fan to blow hot air from the sides of the workpiece in the resistance furnace towards the air guide plate and the middle position of the side of the workpiece closest to the air diffuser. The air guide plate guides the hot air to the middle position of the side of the workpiece furthest from the air diffuser. The hot air enters the filter box through the air inlet and fixed pipe, is filtered by activated carbon, and is then blown back into the furnace by the fan for circulation, achieving uniform heating of the workpiece and filtration of exhaust gas. When the workpiece rises, it pushes the air inlet upward to maintain the gap between the workpiece and the air inlet.

[0035] S5. Workpiece Removal and Furnace Bottom Sealing: After heating is completed, the drive platform and workpiece are lowered into the trolley body; the trolley body is moved out from under the resistance furnace body. During this process, the trolley body pulls the heat insulation cloth from the winding drum to seal the bottom of the resistance furnace body.

[0036] Beneficial effects: In this invention, the outer wall of the bidirectional lead screw is threaded with two movable seats, which are respectively located on the positive and negative thread sections of the bidirectional lead screw. The tops of the two movable seats are rotatably connected to the support platform via connecting rods. One side of the resistance furnace body is rotated by a rotating shaft via two bases. The outer wall of the rotating shaft is wound with heat insulation cloth via a winding cylinder. One end of the heat insulation cloth is fixedly connected to one side of the trolley body. When the trolley body moves to the bottom of the resistance furnace body, the support platform pushes the workpiece upward into the resistance furnace body for heating, and the trolley body seals the bottom of the resistance furnace body to prevent heat from escaping from the resistance furnace body. When the trolley body moves out from under the resistance furnace body, the trolley body pulls out the heat insulation cloth to seal the bottom of the resistance furnace body, preventing heat from escaping from the resistance furnace body and preventing the escaped heat from causing harm to the workers.

[0037] In this invention, air guide plates are fixed on the inner walls of the two sides of the electric resistance furnace body that are far apart from each other. The top of the fixed cylinder is connected to the placement box through an L-shaped pipe. Activated carbon is provided between the screen plate and the cover plate. The placement box is fixedly connected to the air inlet of the blower through a return air pipe. The air blown out by the blower can just blow the air heated by the electric resistance heating tube towards the air guide plate and towards the middle position on the side of the workpiece closer to the air diffuser. The air guide plate can guide the hot air towards the middle position on the side of the workpiece away from the air diffuser. Then the hot air enters the placement box through the air intake and the fixed cylinder, so that the hot air flows in the electric resistance furnace body and heats the workpiece evenly. The activated carbon filters the hot air, which not only avoids the waste of heat energy, but also filters the air in the electric resistance furnace body, preventing the waste gas generated during the workpiece heating process from overflowing into the outside world and causing air pollution.

[0038] In this invention, the movable block is provided with a trapezoidal groove and a limiting groove on the side near the mounting plate, and a limiting rod is fixed on one side of the mounting plate. When the trolley body moves to the bottom of the resistance furnace body and closes the bottom of the resistance furnace body, the trolley body drives the limiting rod and the contact to move through the mounting plate. The limiting rod extends into the trapezoidal groove and is inserted into the limiting groove with the cooperation of the inner walls on both sides of the trapezoidal groove, which plays a limiting role for the movable block, so that the brass contact piece and the contact are coaxial, and avoids the contact and brass contact piece from being unable to accurately connect due to the deviation of the trolley body position in the later stage.

[0039] In this invention, the furnace bottom is automatically sealed when the trolley is moved out by a combination of a bidirectional lead screw and heat insulation cloth, reducing heat loss and avoiding the risk of burns; the air guide plate and air circulation structure work together to ensure uniform flow of hot air and improve the heating quality of the workpiece; the limit rod and trapezoidal groove design ensure precise docking of the contacts and contact plates to prevent collision damage; the activated carbon filter effectively purifies the exhaust gas and reduces environmental pollution. The overall solution takes into account energy saving, high efficiency, safety and environmental protection, and significantly improves the comprehensive performance of the equipment. Attached Figure Description

[0040] Figure 1 This is a three-dimensional structural schematic diagram of a spring-loaded assembly provided by the present invention;

[0041] Figure 2 A three-dimensional exploded structural diagram of a spring-loaded assembly provided by the present invention;

[0042] Figure 3 A three-dimensional cross-sectional view of a spring-loaded assembly provided by the present invention;

[0043] Figure 4 This is a three-dimensional structural schematic diagram of the trolley-type resistance furnace provided by the present invention from a first-view perspective.

[0044] Figure 5 This is a three-dimensional structural schematic diagram of the trolley-type resistance furnace provided by the present invention from a second perspective.

[0045] Figure 6 This is a three-dimensional cross-sectional structural diagram of the trolley-type resistance furnace provided by the present invention;

[0046] Figure 7 This is a three-dimensional exploded structural diagram of the L-shaped plate, moving block, and mounting plate of the trolley-type resistance furnace provided by the present invention.

[0047] Figure 8 A three-dimensional exploded structural diagram of the support platform, moving seat and trolley body of the trolley-type resistance furnace provided by the present invention.

[0048] Figure 9 A three-dimensional exploded view of the box body and coil spring of the trolley-type resistance furnace provided by the present invention, and a partial cross-sectional view of the reflux pipe.

[0049] Figure 10 A three-dimensional exploded structural diagram of the placement box, screen plate and suction cylinder of the trolley-type resistance furnace provided by the present invention.

[0050] Figure 11 This is a three-dimensional cross-sectional structural diagram of the trolley-type resistance furnace body and the closed door provided by the present invention.

[0051] Figure 12 A three-dimensional cross-sectional view of the moving block of the trolley-type resistance furnace provided by the present invention.

[0052] Figure 13 The hot air flow diagram of the bogie-type resistance furnace provided by the present invention.

[0053] In the diagram: 1. Movable rod; 2. First insulating sleeve; 3. Second insulating sleeve; 4. Spring; 5. First bolt; 6. Groove; 7. Brass contact piece; 8. Copper core; 9. Second bolt; 10. Arc-shaped groove; 11. Resistance furnace body; 12. Resistance heating tube; 13. Sealing door; 14. Trolley body; 15. Electric wheel; 16. Track; 17. L-shaped plate; 18. Sliding groove; 19. Moving block; 20. Trapezoidal groove; 21. Limiting groove; 22. Limiting rod; 23. Guide rod; 24. 25. Double-acting lead screw; 26. Moving seat; 27. Connecting rod; 28. Bearing platform; 29. ​​Base; 30. Rotating shaft; 31. Winding drum; 32. Insulation cloth; 33. Box body; 34. Coil spring; 35. Fixed cylinder; 36. Suction cylinder; 37. Trapezoidal block; 38. L-shaped tube; 39. Placement box; 40. Screen plate; 41. Activated carbon; 42. Cover plate; 43. Return air pipe; 44. Fan; 45. Dispersing cylinder; 46. Air guide plate; 47. Mounting plate; 48. Limiting plate; 49. Contact. Detailed Implementation

[0054] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0055] In one embodiment: Refer to Figures 1-3 A spring-loaded assembly, relating to the field of resistance furnace technology, mainly comprises a movable rod 1, a first insulating sleeve 2, a second insulating sleeve 3, a spring 4, a first bolt 5, a copper core 8, a second bolt 9, and a brass contact piece 7.

[0056] Reference Figures 1-3 The movable rod 1 is a cylindrical metal rod with a highly smooth outer wall to reduce friction during sliding. A first insulating sleeve 2 and a second insulating sleeve 3 are sequentially slidably fitted onto the outer wall of the movable rod 1. The second insulating sleeve 3 is fixed to one end of the first insulating sleeve 2 by an interference fit. Both the first insulating sleeve 2 and the second insulating sleeve 3 are made of bakelite, effectively isolating current and preventing leakage accidents.

[0057] Reference Figures 1-3 Spring 4 is a cylindrical helical spring made of stainless steel wire, which has high elasticity and corrosion resistance. The outer diameter of spring 4 ranges from 10-15 mm, the inner diameter from 6-10 mm, the free height from 20-30 mm, the wire diameter from 1.5-2.5 mm, and the spring stiffness from 5-15 N / mm. Both ends of spring 4 are fixedly connected to the side of the first insulating sleeve 2 furthest from the second insulating sleeve 3 and the outer wall of the movable rod 1, respectively, via spring seats. When the movable rod 1 is moved by an external force, spring 4 is compressed, providing clearance and cushioning. After the external force disappears, the elastic force of spring 4 returns the movable rod 1 to its original position.

[0058] Reference Figures 1-3 A first bolt 5 is threaded onto the outer wall of the movable rod 1. The first bolt 5 is a standard hexagonal bolt, and its specifications are determined according to the diameter of the movable rod 1. The first bolt 5 abuts against the side of the second insulating sleeve 3 away from the first insulating sleeve 2, which is used to limit the movable rod 1 when it is reset and prevent the movable rod 1 from moving excessively.

[0059] Reference Figures 1-3 A copper core 8 runs through the movable rod 1. The copper core 8 has good electrical and thermal conductivity, enabling it to quickly transfer current and heat. A second bolt 9 is threaded onto the outer wall of the copper core 8. The second bolt 9 is also a standard hexagonal bolt, and its specifications are determined according to the diameter of the copper core 8. One side of the second bolt 9 abuts against the end of the movable rod 1 away from the brass contact piece 7, thus fixing the copper core 8 and the brass contact piece 7 inside the movable rod 1.

[0060] Reference Figure 2 and Figure 3 One end of the movable rod 1 has a groove 6, which is circular and its diameter is slightly larger than that of the brass contact piece 7. The depth is determined according to the thickness of the brass contact piece 7. The brass contact piece 7 is set in the groove 6, and one end of the copper core 8 extends into the brass contact piece 7 to ensure stable current conduction. The side of the brass contact piece 7 away from the second bolt 9 has an arc-shaped groove 10, which increases the contact area between the contact 48 and the brass contact piece 7, improves conductivity, and also plays a buffering and guiding role to a certain extent, reducing the impact force during collision.

[0061] Reference Figures 3-11 The trolley-type resistance furnace includes the aforementioned spring-loaded assembly, as well as the furnace body 11, resistance heating tube 12, trolley body 14, power supply structure, closed structure, and air circulation structure.

[0062] Reference Figure 6 and Figure 11 The resistance furnace body 11 is rectangular in shape and is welded from steel plates, providing good strength and sealing. Resistance heating tubes 12 are fixed to the inner walls of both sides of the resistance furnace body 11, which are far apart from each other. The resistance heating tubes 12 are made of iron-chromium-aluminum alloy resistance wire, and their power is determined according to the heating requirements of the resistance furnace. The resistance heating tubes 12 are evenly distributed on the inner walls of both sides of the resistance furnace body 11 to heat the workpiece placed inside the movable rod 1.

[0063] Reference Figure 4 and Figure 5The trolley body 14 has a flat plate structure, and its top fits into the bottom of the resistance furnace body 11 to seal the bottom of the resistance furnace body 11 and prevent heat loss from the resistance furnace body 11. Two electric wheels 15 are rotatably mounted on both sides of the trolley body 14. The electric wheels 15 are driven by DC motors and feature a wide speed range and smooth operation. Two tracks 16 are laid under the resistance furnace body 11. The two electric wheels 15 on the same side cooperate with the corresponding tracks 16. By controlling the rotation of the electric wheels 15, the trolley body 14 is driven to move smoothly under the resistance furnace body 11.

[0064] Reference Figure 5 and Figure 7 The energizing structure is used to energize the resistance heating tube 12 when the trolley body 14 moves to the bottom of the resistance furnace body 11. The energizing structure includes a mounting plate 46 fixed to the bottom of one side of the trolley body 14. The mounting plate 46 is an insulating plate and is fixed to the trolley body 14 by bolts. A contact 48 is fixedly inserted through the mounting plate 46. The contact 48 is made of copper, has good conductivity, and is cylindrical in shape. An L-shaped plate 17 is fixed to one side of the resistance furnace body 11. Its vertical part is fixedly connected to the resistance furnace body 11, and its horizontal part is used to install other components. The L-shaped plate 17 has a sliding groove 18, which is a rectangular groove. Its width is slightly larger than the width of the moving block 19, and its depth is determined according to the moving stroke of the moving block 19. The moving block 19 slides within the sliding groove 18. The first insulating sleeve 2 and the second insulating sleeve 3 are both fixedly installed within the moving block 19, for example, by bolts or interference fit.

[0065] Specifically, when the trolley body 14 moves below the resistance furnace body 11 and closes the bottom of the resistance furnace body 11, the contact 48 extends into the copper core 8 and contacts the brass contact piece 7. As the trolley body 14 continues to move, the contact 48 pushes the movable rod 1 to slide within the first insulating sleeve 2 and the second insulating sleeve 3 through the brass contact piece 7, compressing the spring 4. During this process, the elasticity of the spring 4 acts as a buffer, preventing the brass contact piece 7 and the contact 48 from being severely impacted or twisted and damaged.

[0066] Reference Figure 6 , Figure 8 and Figure 9The enclosed structure is used to seal the resistance furnace body 11 when the trolley body 14 moves out from and into the bottom of the resistance furnace body 11. The enclosed structure includes a rotating shaft 29 rotatably mounted on one side of the resistance furnace body 11 and a support platform 27 inside the trolley body 14 for carrying workpieces. The rotating shaft 29 is a cylindrical metal shaft, rotatably mounted between two bases 28 via bearings. The bases 28 are rectangular block structures, fixed to one side of the resistance furnace body 11, and used to support the rotating shaft 29. A winding cylinder 30 is fixedly sleeved on the outer wall of the rotating shaft 29. The winding cylinder 30 is cylindrical. A heat-insulating cloth 31 is wound around the outer wall of the winding cylinder 30. The heat-insulating cloth 31 is made of aluminum silicate fiber cloth, which has excellent heat insulation performance, can withstand temperatures up to 1000℃ and can effectively prevent heat transfer. One end of the heat insulation cloth 31 is fixedly connected to one side of the trolley body 14. When the trolley body 14 moves out from the bottom of the resistance furnace body 11, the bottom of the resistance furnace body 11 is sealed by the heat insulation cloth 31.

[0067] Reference Figure 9 Two circular boxes 32 are rotatably fitted onto the outer wall of the rotating shaft 29 and are fixed to one side of each of the two bases 28. A coil spring 33, made of stainless steel, is installed inside each box 32, providing good elasticity and fatigue resistance. One end of the coil spring 33 is fixedly connected to one side of the base 28, and the other end is fixedly connected to the outer wall of the rotating shaft 29. When the trolley body 14 moves below the resistance furnace body 11, the coil spring 33 drives the rotating shaft 29 to reset and rotate, completing the winding of the heat insulation cloth 31.

[0068] Reference Figure 6 and Figure 8 The enclosed structure also includes a bidirectional lead screw 24 rotating within the trolley body 14. The bidirectional lead screw 24 is a cylindrical metal rod with positive and negative threads on its surface. Two movable seats 25 are threadedly fitted onto the outer wall of the bidirectional lead screw 24. The two movable seats 25 are located on the positive and negative threaded sections of the bidirectional lead screw 24, respectively. By rotating the bidirectional lead screw 24, the two movable seats 25 can be controlled to move in opposite directions. Two guide rods 23 are fixed inside the trolley body 14. The guide rods 23 are cylindrical metal rods. The two movable seats 25 are slidably fitted onto the outer walls of the two guide rods 23, which serve as guides to ensure the stability of the movement of the movable seats 25. A connecting rod 26, which is a metal rod, is rotatably connected to the top of each of the two movable seats 25. The top of the connecting rod 26 is rotatably connected to the bottom of the support platform 27, and the support platform 27 slides within the trolley body 14.

[0069] Specifically, when the two movable seats 25 move in opposite directions, the lifting and lowering of the support platform 27 is controlled by the connecting rod 26. When the trolley body 14 moves to the bottom of the resistance furnace body 11, the bidirectional lead screw 24 rotates, pushing the support platform 27 and the workpiece upwards into the resistance furnace body 11, facilitating the heating of the workpiece by the resistance heating tube 12. At the same time, the trolley body 14 seals the bottom of the resistance furnace body 11 to prevent heat loss. When the trolley body 14 moves out from under the resistance furnace body 11, it pulls the heat insulation cloth 31 off the winding drum 30, sealing the bottom of the resistance furnace body 11 to prevent heat loss and avoid injury to workers from the heat loss.

[0070] Reference Figure 5 , Figure 6 , Figure 10 and Figure 13 The air circulation structure is used to uniformly heat the workpiece in the resistance furnace body 11. The air circulation structure includes a fixed cylinder 34 that penetrates the inner top wall of the resistance furnace body 11 and two fans 43 fixed to the side of the resistance furnace body 11 near the rotating shaft 29. The fixed cylinder 34 is a cylindrical metal cylinder. An air suction cylinder 35 is slidably fitted onto the outer wall of the fixed cylinder 34. The air suction cylinder 35 is cylindrical, and its diameter is slightly larger than the diameter of the fixed cylinder 34. A trapezoidal block 36 is fixed to the outer wall of the air suction cylinder 35, which creates a gap between the air suction cylinder 35 and the workpiece to facilitate the intake of hot air. The fixed cylinder 34 and the air suction cylinder 35 work together to exhaust hot air from above the workpiece.

[0071] Reference Figure 5 and Figure 11 Two cylindrical air diffusers 44 are fixed to one inner wall of the resistance furnace body 11. The outlets of two blowers 43 extend into the resistance furnace body 11 through pipes and cooperate with the corresponding air diffusers 44. The blowers 43 are centrifugal blowers, providing sufficient airflow to circulate hot air within the resistance furnace body 11. Air guide plates 45 are fixed to the inner walls of the two sides of the resistance furnace body 11 that are far apart from each other. The air guide plates 45 are rectangular plates with an inclination angle ranging from 30° to 60°, used to guide the airflow from the blowers 43 towards the center, ensuring that the hot air is evenly distributed towards the workpiece.

[0072] Reference Figure 6 and Figure 10A rectangular box 38, welded from steel plate, is fixed to the top of the resistance furnace body 11. Its internal space is used to hold filter materials such as activated carbon 40 (which are replaced periodically or as needed). A screen plate 39, made of woven metal wire with a pore size of 0.5-1mm, is fixed inside the box 38 to support the activated carbon 40 and allow air to pass through. An L-shaped tube 37, made of metal, is fixedly connected to the top of the fixed cylinder 34. One end of the L-shaped tube 37 extends into the box 38, located below the screen plate 39, to inject hot air from the resistance furnace body 11 into the box 38. A cover plate 41 is provided on the top of the box 38, connected to it by bolts for easy removal and replacement of the activated carbon 40. Activated carbon 40 is disposed between the screen plate 39 and the cover plate 41. The activated carbon 40 has good adsorption properties and can filter and adsorb the air injected into the placement box 38, removing impurities and odors from the air. Two return air pipes 42 are fixed on the side of the placement box 38 away from the L-shaped pipe 37. The two return air pipes 42 are metal pipes. The two return air pipes 42 are fixedly connected to the air inlet of two fans 43, respectively, to re-inject the filtered hot air into the electric resistance furnace body 11, avoiding heat energy waste.

[0073] Specifically, since the two fans 43 are located on both sides close to the workpiece, the air they blow is directed towards the air guide plate 45 and towards the center of the workpiece near the diffuser 44. The air guide plate 45 guides the hot air towards the center of the workpiece away from the diffuser 44. Then, the hot air enters the placement box 38 through the suction pipe 35 and the fixing cylinder 34, allowing the hot air to flow within the resistance furnace body 11 and heat the workpiece evenly. In addition, the hot air is filtered by activated carbon 40 before entering the resistance furnace body 11 through the fans 43 to heat the workpiece again. This avoids heat waste and filters the air within the resistance furnace body 11, preventing exhaust gases generated during the workpiece heating process from escaping to the outside and causing air pollution.

[0074] Reference Figures 4-6A sealing door 13 is rotatably connected to the side of the resistance furnace body 11 away from the blower 43. The sealing door 13 is a rectangular plate structure, and its size matches the opening size of the resistance furnace body 11. The bottom of the sealing door 13 is flush with the top of the trolley body 14 and is rotatably connected to the resistance furnace body 11 via a hinge, allowing for easy opening and closing. A limit plate 47 is fixed to one side of the trolley body 14. The limit plate 47 is a rectangular plate structure with a height ranging from 10-15mm. The limit plate 47 contacts the sealing door 13 to limit the movement of the trolley body 14. When the trolley body 14 moves to the appropriate position, the limit plate 47 contacts the sealing door 13, preventing the trolley body 14 from moving further, while ensuring that the trolley body 14 and the resistance furnace body 11 are accurately aligned. The sealing door 13 can seal one side of the resistance furnace body 11, preventing heat loss from the resistance furnace body 11. Furthermore, opening the sealing door 13 allows for convenient maintenance of the interior of the resistance furnace body 11 by personnel.

[0075] In another embodiment: Refer to Figure 12 The movable block 19 has a trapezoidal groove 20 on the side near the mounting plate 46. A limiting groove 21, which is rectangular, is provided inside the movable block 19 and communicates with the trapezoidal groove 20. A limiting rod 22, which is cylindrical, is fixed to one side of the mounting plate 46. The limiting rod 22 cooperates with the trapezoidal groove 20 and the limiting groove 21.

[0076] When the trolley body 14 moves to the bottom of the resistance furnace body 11 and closes the bottom of the resistance furnace body 11, the trolley body 14 drives the limiting rod 22 and the contact 48 to move through the mounting plate 46. The limiting rod 22 extends into the trapezoidal groove 20 and is inserted into the limiting groove 21 with the cooperation of the inner walls on both sides of the trapezoidal groove 20, which plays a limiting role on the moving block 19, so that the brass contact 7 and the contact 48 are coaxial, and avoid the contact 48 and the brass contact 7 from being unable to accurately connect due to the deviation of the position of the trolley body 14 in the later stage.

[0077] The operating method of a trolley-type resistance furnace includes the following steps:

[0078] S1. Place the workpiece to be heated on the support platform 27. Before placing the workpiece in the resistance furnace body 11 for heating, drive the bidirectional lead screw 24 to rotate through the motor. The bidirectional lead screw 24 drives the two moving seats 25 to move to both sides. The moving seats 25 drive the support platform 27 and the workpiece to move down through the connecting rod 26, and store the workpiece in the trolley body 14. Drive the trolley body 14 to move through the cooperation of the electric wheel 15 and the track 16 until the trolley body 14 moves to the bottom of the resistance furnace body 11 and cooperates with the resistance furnace body 11 to seal the bottom of the resistance furnace body 11, so as to prevent the heat inside the resistance furnace body 11 from dissipating during operation. Then the bidirectional lead screw 24 rotates in the opposite direction to push the support platform 27 and the workpiece upward, so that the resistance heating tube 12 can heat the workpiece.

[0079] S2. When the trolley body 14 moves to the bottom of the resistance furnace body 11 and closes the bottom of the resistance furnace body 11, the trolley body 14 drives the limit rod 22 and the contact 48 to move through the mounting plate 46. The limit rod 22 extends into the trapezoidal groove 20 and is inserted into the limit groove 21 with the cooperation of the inner walls on both sides of the trapezoidal groove 20, which plays a limiting role on the moving block 19, so that the brass contact 7 and the contact 48 are coaxial, and avoid the later deviation of the position of the trolley body 14, which would cause the contact 48 and the brass contact 7 to fail to accurately connect.

[0080] S3. After the limiting rod 22 passes through the limiting groove 21, the contact 48 extends into the copper core 8 and touches the brass contact piece 7. As the trolley body 14 moves, the contact 48 pushes the movable rod 1 to slide in the first insulating sleeve 2 and the second insulating sleeve 3 through the brass contact piece 7, and the spring 4 is compressed. This can prevent the brass contact piece 7 and the contact 48 from being damaged by collision or twisting when they are connected. When the contact 48 is connected to the brass contact piece 7, the resistance heating tube 12 is energized to heat the workpiece inside the resistance furnace body 11.

[0081] S4. When heating the workpiece, in order to ensure that the workpiece can be heated evenly, the blower 43 blows air into the resistance furnace body 11. Since the two blowers 43 are located on both sides close to the workpiece, the air blown out can just blow the air heated by the resistance heating tube 12 towards the guide plate 45 and towards the middle position of the workpiece near the diffuser 44. The guide plate 45 can guide the hot air towards the middle position of the workpiece away from the diffuser 44. Then the hot air enters the placement box 38 through the suction pipe 35 and the fixed pipe 34, so that the hot air can flow in the resistance furnace body 11 and heat the workpiece evenly. In addition, the hot air is filtered by activated carbon 40 and then enters the resistance furnace body 11 through the blower 43 to heat the workpiece again. This not only avoids the waste of heat energy, but also filters the air in the resistance furnace body 11, preventing the exhaust gas generated during the workpiece heating process from overflowing into the outside and causing air pollution.

[0082] S5. In addition, by setting the trapezoidal block 36, when the workpiece is transported from the trolley body 14 to the resistance furnace body 11 by the support platform 27, the workpiece pushes the suction cylinder 35 upward by the trapezoidal block 36, so that there is a gap between the workpiece and the suction cylinder 35, so that the suction cylinder 35 can draw the hot air in the resistance furnace body 11 into the placement box 38 for filtration.

[0083] S6. After the workpiece is heated, the workpiece is placed into the trolley body 14 by the support platform 27. Then the trolley body 14 is moved out from under the resistance furnace body 11, and the trolley body 14 pulls the heat insulation cloth 31 out from the winding drum 30. Thus, the bottom of the resistance furnace body 11 can be sealed by the heat insulation cloth 31 to prevent the heat inside the resistance furnace body 11 from escaping and to prevent the escaping heat from causing harm to the staff.

[0084] The working principles and wiring methods of the resistance heating tube 12, the fan 43 and the electric wheel 15 are all conventional technical means for those skilled in the art. Their specific implementation methods can be configured with reference to well-known technical solutions in the field according to actual technical needs, and will not be described again in this specification.

[0085] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0086] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A bogie-type resistance furnace, comprising a spring-loaded assembly, the spring-loaded assembly comprising: Movable lever (1); The first insulating sleeve (2) and the second insulating sleeve (3) are fixedly connected to one end of the first insulating sleeve (2), and both are slidably sleeved on the outer wall of the movable rod (1); Spring (4) is sleeved on the outer wall of movable rod (1), and its two ends are respectively fixedly connected to the side of the first insulating sleeve (2) away from the second insulating sleeve (3) and the outer wall of movable rod (1); Copper core (8), through movable rod (1); A brass contact piece (7) is set in a groove (6) at one end of the movable rod (1), and one end of the copper core (8) is fixedly connected to the brass contact piece (7). When the movable rod (1) is moved by an external force, the spring (4) is compressed to provide buffer clearance and realize flexible contact of the energized components; the outer wall of the movable rod (1) is threaded with a first bolt (5), and the first bolt (5) abuts against the side of the second insulating sleeve (3) away from the first insulating sleeve (2) to limit the reset stroke of the movable rod (1); The outer wall of the copper core (8) is threaded with a second bolt (9), which abuts against the end of the movable rod (1) away from the brass contact piece (7) to fix the copper core (8) and the brass contact piece (7) inside the movable rod (1). The brass contact piece (7) has an arc-shaped groove (10) on the side away from the second bolt (9) to enhance the contact stability with the external contact. Its characteristic is that it further includes: The resistance furnace body (11) has resistance heating tubes (12) fixed on the inner walls of its two sides that are far apart from each other, for heating the workpiece. The trolley body (14) is slidably disposed at the bottom of the resistance furnace body (11). The top of the trolley body (14) cooperates with the bottom of the resistance furnace body (11) to seal the bottom of the resistance furnace body (11) when the trolley body (14) moves to the bottom of the resistance furnace body (11) to prevent heat from dissipating. Two sets of energizing structures are used to energize the resistance heating tube (12) when the trolley body (14) moves to the bottom of the resistance furnace body (11); A closed structure is provided between the resistance furnace body (11) and the trolley body (14) for sealing the resistance furnace body (11) when the trolley body (14) moves out or enters. The closed structure includes a rotating shaft (29) rotatably provided on one side of the resistance furnace body (11) and a support platform (27) slidably provided in the trolley body (14) for carrying workpieces. as well as, An air circulation structure is installed inside the resistance furnace body (11) for uniformly heating the workpiece. The air circulation structure includes a fixed cylinder (34) that penetrates the inner top wall of the resistance furnace body (11) and two fans (43) fixed on one side of the resistance furnace body (11). The power supply structure includes a mounting plate (46) fixed to the bottom of one side of the trolley body (14), and a contact (48) is fixedly inserted through the mounting plate (46). An L-shaped plate (17) is fixed to one side of the resistance furnace body (11), and a sliding groove (18) is provided in the L-shaped plate (17). The inner part is provided with a movable block (19), and the first insulating sleeve (2) and the second insulating sleeve (3) are fixedly installed in the movable block (19); the contact (48) and the brass contact plate (7) are pluggable; when the trolley body (14) moves to the bottom of the resistance furnace body (11) and closes the bottom, the contact (48) extends into the copper core (8) and touches the brass contact plate (7). The contact (48) pushes the movable rod (1) to slide in the first insulating sleeve (2) and the second insulating sleeve (3) through the brass contact plate (7), and the spring (4) is compressed, so as to avoid collision damage when the resistance heating tube (12) is energized.

2. The bogie-type resistance furnace according to claim 1, characterized in that, The enclosed structure also includes a bidirectional lead screw (24) rotatably disposed within the trolley body (14). Two movable seats (25) are threadedly fitted on the outer wall of the bidirectional lead screw (24). The two movable seats (25) are respectively located on the positive and negative thread sections of the bidirectional lead screw (24). Two guide rods (23) are fixed inside the trolley body (14). The two movable seats (25) are slidably fitted on the guide rods (23). The top of each of the two movable seats (25) is rotatably connected to a connecting rod (26). The top of the connecting rod (26) is rotatably connected to the bottom of the support platform (27). When the bidirectional lead screw (24) rotates, the movable seats (25) move in opposite directions and raise and lower the support platform (27) through the connecting rod (26) so as to heat the workpiece.

3. The bogie-type resistance furnace according to claim 2, characterized in that, The rotating shaft (29) is rotatably disposed between two bases (28) on one side of the resistance furnace body (11). A winding cylinder (30) is fixedly sleeved on the outer wall of the rotating shaft (29). A heat insulation cloth (31) of aluminum silicate fiber cloth is wound around the outer wall of the winding cylinder (30). One end of the heat insulation cloth (31) is fixedly connected to one side of the trolley body (14). Two boxes (32) are rotatably sleeved on the outer wall of the rotating shaft (29). The boxes (32) are fixed to the bases (28). On one side, a coil spring (33) is provided inside the box body (32). One end of the coil spring (33) is fixedly connected to the base (28), and the other end is fixedly connected to the rotating shaft (29). The coil spring (33) is pre-tightened. When the trolley body (14) moves to the bottom of the resistance furnace body (11), the coil spring (33) drives the rotating shaft (29) to reset and rotate to rewind the heat insulation cloth (31). When the trolley body (14) moves out, the heat insulation cloth (31) is pulled out to close the bottom and prevent heat from dissipating.

4. The bogie-type resistance furnace according to claim 3, characterized in that, The air circulation structure also includes two air diffusers (44) fixed to the inner wall of one side of the electric resistance furnace body (11), and the air outlet of the blower (43) is connected to the air diffusers (44) through a pipe; air guide plates (45) are fixed to the inner walls of the two sides of the electric resistance furnace body (11) that are far apart from each other, for guiding the airflow to the center; an air intake cylinder (35) is slidably fitted on the outer wall of the fixed cylinder (34), and a sealed gap is formed between the air intake cylinder (35) and the fixed cylinder (34); a trapezoidal block (36) is fixed on the outer wall of the air intake cylinder (35) for maintaining a gap with the workpiece; an L-shaped pipe (37) is fixedly connected to the top of the fixed cylinder (34), and the L-shaped pipe (37) extends into the placement box (38), which is fixed to the electric resistance furnace body (11). At the top, a screen plate (39) is fixed inside the placement box (38), and an L-shaped tube (37) is located below the screen plate (39). The top of the placement box (38) is provided with a cover plate (41), and activated carbon (40) is provided between the screen plate (39) and the cover plate (41). Two return air pipes (42) are fixed on the side of the placement box (38) away from the L-shaped tube (37), and the return air pipes (42) are fixedly connected to the air inlet end of the fan (43). When the fan (43) is running, hot air is blown through the diffuser (44) to the air guide plate (45), and enters the placement box (38) through the suction pipe (35) and the fixed cylinder (34). After being filtered by the activated carbon (40), it returns to the fan (43) through the return air pipe (42), so as to achieve uniform heating and heat energy circulation.

5. The bogie-type resistance furnace according to claim 4, characterized in that, The resistance furnace body (11) is rotatably connected to a closed door (13) on the side away from the blower (43). The bottom of the closed door (13) is flush with the top of the trolley body (14). A limit plate (47) is fixed on one side of the trolley body (14). The limit plate (47) contacts the closed door (13) for limiting, so that heat is prevented from dissipating when the closed door (13) is closed and is convenient for maintenance when it is open.

6. The bogie-type resistance furnace according to claim 5, characterized in that, The movable block (19) has a trapezoidal groove (20) on one side near the mounting plate (46), and a limiting groove (21) communicating with the trapezoidal groove (20) is provided in the movable block (19); a limiting rod (22) is fixed on one side of the mounting plate (46); when the trolley body (14) moves to below the resistance furnace body (11), the limiting rod (22) is inserted into the trapezoidal groove (20) and slides into the limiting groove (21), so that the brass contact piece (7) and the contact (48) are coaxial, avoiding docking deviation.

7. A method for using a bogie-type resistance furnace, applied to the bogie-type resistance furnace as described in claim 6, characterized in that, Includes the following steps: S1. Loading and lowering of workpiece: Place the workpiece to be heated on the support platform (27), start the motor to drive the bidirectional lead screw (24) to rotate, drive the two moving seats (25) to move in opposite directions, and then drive the support platform (27) and workpiece to descend through the connecting rod (26) to store the workpiece in the trolley body (14). S2, Trolley positioning and furnace bottom sealing: Drive the electric wheel (15) to move the trolley body (14) along the track (16) until it reaches the bottom of the resistance furnace body (11) and cooperates with the resistance furnace body (11) to seal the furnace bottom; During the movement, the trolley body (14) drives the limit rod (22) through the mounting plate (46) to insert into the trapezoidal groove (20) and limit groove (21) at the bottom of the resistance furnace body (11) to achieve precise positioning and make the contact (48) coaxial with the brass contact piece (7); The contact (48) moves with the trolley and inserts into the copper core (8) to contact the brass contact piece (7), pushing the movable rod (1) to compress the spring (4) to achieve buffer docking; S3. Workpiece lifting and heating: The bidirectional lead screw (24) rotates in the opposite direction, driving the support platform (27) and the workpiece to rise into the resistance furnace body (11); the contact (48) is connected to the brass contact plate (7) and energized, starting the resistance heating tube (12) to heat the workpiece; S4. Hot air circulation and uniform heating: Start the fan (43) to blow the hot air in the resistance furnace body (11) near the workpiece towards the air guide plate (45) and the middle position of the workpiece near the diffuser (44); the air guide plate (45) guides the hot air to the middle position of the workpiece away from the diffuser (44); the hot air enters the placement box (38) through the suction pipe (35) and the fixed cylinder (34), is filtered by activated carbon (40), and is blown into the furnace again by the fan (43) to achieve uniform heating of the workpiece and filtration of exhaust gas; when the workpiece rises, the suction pipe (35) is pushed up by the trapezoidal block (36) to maintain the gap between the workpiece and the suction pipe (35); S5. Workpiece removal and furnace bottom sealing: After heating is completed, drive the support platform (27) and the workpiece to descend into the trolley body (14); move the trolley body (14) out of the resistance furnace body (11). During this process, the trolley body (14) pulls the heat insulation cloth (31) from the winding drum (30) to unfold and seal the bottom of the resistance furnace body (11).

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