A hot air circulating mold heating furnace

Abstract

The utility model discloses a hot -blast circulation mould heating furnace belongs to mechanical design technical field for realizing the furnace airflow circulation, solves the technical problem of uneven mould heating, including furnace shell, furnace body, heating device, mould support, furnace door assembly, fan impeller, guide plate, furnace shell and furnace body are all the open -top hollow groove body structure, and the furnace body is located in the furnace shell, and is equipped with the heat insulating layer between furnace body and furnace shell, furnace door assembly sets up in the upper end of furnace body, and the mould support sets up in the furnace body, and heating device sets up in the below of mould support, and fan impeller sets up on the rear side side wall of furnace body, and the pivot of fan impeller is connected with the side wall of furnace body through the bearing, and is equipped with the arc guide plate at the corner position between the rear side wall and bottom wall of furnace body, and the front side of fan impeller is equipped with the baffle, and the upper end of baffle is flush with the upper end of furnace body, and the lower end of baffle and the bottom end of furnace body exist certain interval.

Description

Technical Field

[0001] This utility model relates to the field of mechanical design technology, specifically to a hot air circulating mold heating furnace. Background Technology

[0002] In the field of mold processing and manufacturing, mold heating furnaces are key equipment for heat treatment processes such as preheating and tempering of molds. Currently, most mold heating furnaces use heating devices with built-in resistance wires to heat the molds inside the furnace. These heating devices generate heat by passing electricity through the resistance wires, and then transfer the heat to the molds inside the furnace through heat conduction, heat convection, and heat radiation.

[0003] However, this traditional heating method has a significant technical drawback: uneven temperature distribution within the furnace. Since the resistance wire is the primary heat source, areas near the wire absorb heat rapidly and in large quantities, resulting in a significant temperature increase in those areas. Conversely, areas farther from the wire experience delayed heat transfer and heat loss during this process, causing them to be significantly cooler than the areas closer to the wire. This uneven temperature distribution leads to inconsistent heating of different parts of the mold, affecting the heat treatment effect, reducing mold quality and performance, and increasing product defect rates. Furthermore, uneven temperature can cause internal stress in the mold during heating, leading to deformation or even cracking, shortening the mold's lifespan, and increasing production and maintenance costs. Utility Model Content

[0004] In view of this, the present invention discloses a hot air circulating mold heating furnace, the specific solution of which is as follows:

[0005] A hot air circulating mold heating furnace includes a furnace shell, a furnace body, a heating device, a mold support, a furnace door assembly, a fan impeller, a guide plate, and a baffle plate;

[0006] Both the furnace shell and the furnace body are hollow slotted structures with openings at the top. The furnace body is located inside the furnace shell, and a heat insulation layer is provided between the furnace body and the furnace shell. The furnace door assembly is located at the upper end of the furnace body, the mold support is located inside the furnace body, the heating device is located below the mold support, the fan impeller is located on the rear side wall of the furnace body, and the fan impeller shaft is connected to the side wall of the furnace body through a bearing. An arc-shaped guide plate is provided at the corner position between the rear side wall and the bottom wall of the furnace body, and a baffle plate is provided in front of the fan impeller. The upper end of the baffle plate is flush with the upper end of the furnace body, and the lower end of the baffle plate is at a certain distance from the bottom end of the furnace body.

[0007] As a supplement to the technical solution of this utility model, the wind deflector is provided with a round hole and the side surface of the wind deflector is provided with reinforcing ribs.

[0008] As a supplement to the technical solution of this utility model, it also includes a motor, which is mounted on the furnace shell. The shaft of the fan impeller passes through the furnace body and the furnace shell and is connected to the motor via a belt.

[0009] As a supplement to the technical solution of this utility model, the furnace door assembly includes a guide rail, a transmission rod, a cylinder, a cylinder base, a fixed base, a first tilting arm, a furnace door, a pulley, and a second tilting arm;

[0010] The guide rail is located at the upper end of the furnace body, and a pulley is provided on the front side surface of the furnace door, with the pulley located on the guide rail;

[0011] The fixed base is located on the rear side of the furnace door and is fixedly connected to the furnace shell; the transmission rod is connected to the fixed base through a bearing.

[0012] The cylinder base is mounted on the furnace shell, the rodless end cap of the cylinder is hinged to the cylinder base, the piston rod of the cylinder is hinged to the rear end of the first tilting arm, and the front end of the first tilting arm is fixedly connected to the transmission rod.

[0013] The second tilting arm is located on the left and / or right side of the furnace door. The front end of the second tilting arm is hinged to the rear of the furnace door, and the rear end is fixedly connected to the transmission rod.

[0014] As a supplement to the technical solution of this utility model, the furnace door includes a furnace door frame, a furnace door cover plate, an inner lining plate fixing beam, a fixing screw, and an inner lining plate;

[0015] The furnace door frame is a square frame structure with a square through hole in the middle. The furnace door cover is located at the square through hole of the furnace door frame and is fixedly connected to the furnace door frame. The furnace door frame and the furnace door cover together form a groove structure with an opening at the bottom.

[0016] The inner lining plate fixing beam is located below the furnace door cover plate, and the end of the inner lining plate fixing beam is fixedly connected to the furnace door frame. The upper end of the fixing screw is fixedly connected to the inner lining plate fixing beam, and the lower end of the fixing screw is screwed to the inner lining plate by a nut.

[0017] As a supplement to the technical solution of this utility model, the inner lining plate includes a heat insulation plate assembly.

[0018] The heat insulation plate assembly includes a heat insulation plate, a U-shaped connecting plate, and a clamping base plate. The heat insulation plate has four sets, all of which are square plate structures. The four sets of heat insulation plates are arranged in pairs and spaced apart. In the adjacent sets of heat insulation plates, the adjacent sides are bent downwards. The U-shaped connecting plate is a plate structure with a U-shaped cross section. A U-shaped connecting plate is provided between every two adjacent square plates. The lower end of the heat insulation plate after bending is located in the groove of the U-shaped connecting plate and abuts against the bottom end of the groove of the U-shaped connecting plate. The upper end of the U-shaped connecting plate is fixedly connected to the bottom surface of the corresponding heat insulation plate.

[0019] The top-tightening base plate is placed on two adjacent sets of heat insulation plates;

[0020] The fixing screw includes a first fixing screw, which includes a rod-shaped part and a threaded part. The rod-shaped part is a cylindrical structure with no threads on its outer surface. The diameter of the threaded part is smaller than that of the rod-shaped part, and its outer surface is threaded. The threaded part of the first fixing screw passes through the top clamping plate and the U-shaped connecting plate, and the nut is screwed onto the threaded part.

[0021] As a supplement to the technical solution of this utility model, the inner lining plate also includes an outer plate. The outer plate includes a connecting part, a bending part, and a bottom plate part. The connecting part and the bottom plate part are both arranged horizontally, and the bending part is arranged vertically. The connecting part is located at the upper end of the bending part, and the bottom plate part is located at the lower end of the bending part, so that the outer plate is a Z-shaped structure. The outer plate is located on the outer edge of the heat insulation plate assembly, and the connecting part of the outer plate overlaps the upper surface of the heat insulation plate assembly.

[0022] The fixing screw also includes a second fixing screw, which has the same structure as the first fixing screw. The threaded part of the second fixing screw passes through the connecting part of the outer plate and the heat insulation plate assembly. A nut is screwed onto the threaded part of the second fixing screw to clamp and fix the connecting part of the outer plate and the heat insulation plate assembly. The upper end of the second fixing screw is fixedly connected to the inner lining plate fixing beam.

[0023] As a supplement to the technical solution of this utility model, the furnace door also includes a supporting connecting rod, which is disposed at the upper end of the furnace door frame. The upper end of the furnace door frame is provided with a protrusion, and the supporting connecting rod passes through the through hole of the protrusion on the furnace door frame. The end of the supporting connecting rod is hinged to the second tilting arm.

[0024] As a supplement to the technical solution of this utility model, the furnace door assembly also includes a pneumatic system, which includes a triplet, a solenoid valve, a first speed control valve, a second speed control valve, a first air-induced check valve, a second air-induced check valve, a first main pipeline, a second main pipeline, a first branch pipeline, a second branch pipeline, a third branch pipeline, and a fourth branch pipeline.

[0025] The triplet is connected to the solenoid valve via a pipeline. One end of the first main pipeline is connected to the solenoid valve, and the other end is provided with a first tee fitting. One end of the first branch pipeline is connected to the first outlet of the first tee fitting, and the other end is connected to the first speed control valve. One end of the second branch pipeline is connected to the second outlet of the first tee fitting, and the other end is connected to the induction port of the second air-induced check valve.

[0026] One end of the second main pipeline is connected to the solenoid valve, and the other end is provided with a second three-way fitting. One end of the third branch pipeline is connected to the first outlet of the second three-way fitting, and the other end is connected to the second speed regulating valve. One end of the fourth branch pipeline is connected to the second outlet of the second three-way fitting, and the other end is connected to the induction port of the first air-induced check valve.

[0027] The first speed control valve is connected to the inlet of the first air-induced check valve, and the outlet of the first air-induced check valve is connected to the first air port of the cylinder.

[0028] The second speed control valve is connected to the inlet of the second air-induced check valve, and the outlet of the second air-induced check valve is connected to the second air port of the cylinder.

[0029] Beneficial effects: This invention forms a closed-loop airflow circulation system through the arrangement of baffles and guide plates, allowing for full heat exchange between the airflow and the mold, eliminating localized temperature differences, avoiding heating blind spots, and improving the heating uniformity of the mold. The baffles have round holes to accelerate airflow circulation, increase the airflow velocity within the system, and ensure temperature uniformity within the furnace. In another aspect of this invention, the furnace door is designed to be controlled by a pneumatic system, and the upward direction of heat radiation enhances operational safety. Attached Figure Description

[0030] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0031] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0032] Figure 3 This is a cross-sectional structural diagram of the present invention.

[0033] Figure 4 This is a schematic diagram of the furnace body structure of this utility model.

[0034] Figure 5 This is a schematic diagram of the furnace body structure of this utility model.

[0035] Figure 6 This is a schematic diagram of the heating device of this utility model.

[0036] Figure 7 This is a schematic diagram of the furnace door assembly structure of this utility model.

[0037] Figure 8 This is a schematic diagram of the furnace door assembly structure of this utility model.

[0038] Figure 9 This is a schematic diagram of the furnace door structure of this utility model.

[0039] Figure 10 This is a schematic diagram of the furnace door frame structure of this utility model.

[0040] Figure 11 This is a schematic diagram of the guide rail structure of this utility model.

[0041] Figure 12 This is a schematic diagram of the assembly structure of the inner lining plate fixing beam and the inner lining plate of this utility model.

[0042] Figure 13 This is a schematic diagram of the inner lining plate structure of this utility model.

[0043] Figure 14 This is a schematic diagram of the inner lining plate structure of this utility model.

[0044] Figure 15 This is a schematic diagram of the pneumatic system structure of this utility model.

[0045] In the diagram: 1. Furnace shell, 2. Furnace body, 3. Heating device, 4. Mold support, 5. Motor, 6. Fan impeller, 7. Guide plate, 8. Furnace door assembly, 9. Guide rail, 10. Transmission rod, 11. Fixed base, 12. First tilting arm, 13. Furnace door, 14. Pulley, 15. Second tilting arm, 16. Slide plate, 17. Limiting plate, 18. Cylinder, 19. Cylinder base, 20. Furnace door frame, 21. Furnace door cover, 22. Inner lining plate fixing beam, 23. First fixing screw, 24. Inner lining plate, 25. First heat insulation plate, 26. 27. Second heat insulation plate, 28. Third heat insulation plate, 29. Fourth heat insulation plate, 20. U-shaped connecting plate, 31. Tightening base plate, 32. Second fixing screw, 33. Outer plate, 34. Supporting connecting rod, 35. Triple unit, 36. Solenoid valve, 37. First speed regulating valve, 38. Second speed regulating valve, 39. First air-induced check valve, 40. Second air-induced check valve, 41. First main pipeline, 42. Second main pipeline, 43. First branch pipeline, 44. Second branch pipeline, 45. Third branch pipeline, 46. Fourth branch pipeline, 47. Wind baffle. Detailed Implementation

[0046] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0047] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0048] like Figures 1 to 15 As shown, a hot air circulating mold heating furnace includes a furnace shell 1, a furnace body 2, a heating device 3, a mold support 4, a furnace door 13 assembly 8, a motor 5, a fan impeller 6, and a guide plate 7.

[0049] Both the furnace shell 1 and the furnace body 2 are hollow groove structures with openings at the top. The furnace body 2 is set inside the furnace shell 1. A heat insulation layer is provided between the furnace body 2 and the furnace shell 1. A heat insulation plate is provided between the upper end of the furnace body 2 and the upper end of the furnace shell 1. Through the above settings, the heat preservation effect is improved while preventing the surface temperature of the furnace shell 1 from getting too high, thus ensuring personnel safety.

[0050] The furnace door 13 assembly 8 is located at the upper end of the furnace body 2. The mold is placed in or taken out by opening and closing the furnace door 13 assembly 8.

[0051] The mold support 4 is located inside the furnace body 2, the heating device 3 is located below the mold support 4, and the mold is placed on the mold support 4.

[0052] The fan impeller 6 is mounted on the rear side wall of the furnace body 2. The shaft of the fan impeller 6 is connected to the side wall of the furnace body 2 via a bearing, allowing the fan impeller 6 to rotate relative to the furnace body 2. The heating device 3 contains a heating tube with a resistance wire inside, which converts electrical energy into heat energy.

[0053] An arc-shaped guide plate 7 is provided at the corner between the rear side wall and the bottom wall of the furnace body 2, and a baffle plate 46 is provided in front of the fan impeller 6. The upper end of the baffle plate 46 is flush with the upper end of the furnace body 2, and the lower end of the baffle plate 46 is at a certain distance from the bottom end of the furnace body 2.

[0054] During equipment operation, the drive unit drives the fan impeller 6 to rotate at high speed. Guided by the baffle plate 46, the airflow generated by the fan impeller 6 is guided downwards to the guide plate 7. The guide plate 7 directs the airflow towards the front wall of the furnace body 2. When the airflow reaches the front wall of the furnace body 2, it is blocked by the wall and changes direction, moving upwards. After passing through the area of ​​the furnace door assembly 8, the airflow flows back towards the baffle plate 46 and moves downwards again under the action of the baffle plate 46, thus forming a complete airflow circulation system within the furnace body 2. By rationally planning the guiding path and airflow direction, a closed-loop airflow trajectory is constructed. During continuous circulation, the airflow can fully exchange heat with the mold inside the furnace body 2. Thanks to the high efficiency of convective heat transfer, heat is evenly and stably transferred to all parts of the mold. This not only effectively eliminates local temperature differences but also avoids heating blind spots caused by uneven heat distribution in traditional heating methods, thereby significantly improving the heating uniformity of the mold.

[0055] As a preferred embodiment of this invention, the baffle plate 46 is provided with a circular hole. When the circulating airflow returns to the area of ​​the baffle plate 46, it can be re-converged through the circular hole to the working area of ​​the fan impeller 6, accelerating the circulation of the airflow and increasing the airflow speed in the entire system. Through the above design, the airflow efficiency is effectively improved, further ensuring the temperature uniformity inside the furnace body 2.

[0056] As a supplement to the above technical solution, the two ends of the baffle plate 46 are respectively connected to the side wall of the furnace body 2.

[0057] As a supplement to the above technical solution, the side surface of the wind baffle 46 near the impeller 6 is provided with vertically arranged reinforcing ribs, which are used to improve the overall structural strength of the wind baffle 46.

[0058] As a preferred technical solution of this utility model, a guide plate 7 can also be provided at the corner of the bottom wall and the front side wall of the furnace body 2, and at the corner of the front side wall and the furnace door 13 assembly 8, to further improve the airflow effect.

[0059] As a preferred embodiment of this invention, the invention further includes a motor 5, which is mounted on the furnace shell 1. The shaft of the fan impeller 6 passes through the furnace body 2 and the furnace shell 1, and is located outside the furnace shell 1. The fan impeller 6 is connected to the side walls of the furnace body 2 and the furnace shell 1 using bearings. The motor 5 is connected to the shaft via a belt, and the motor 5 drives the fan impeller 6 to rotate.

[0060] As a preferred technical solution of this utility model, the furnace door 13 assembly 8 includes a guide rail 9, a transmission rod 10, a fixed base 11, a first tilting arm 12, a furnace door 13, a pulley 14, a cylinder 18, a cylinder base 19, and a second tilting arm 15.

[0061] The guide rails 9 are provided in two sets, and the two sets of guide rails 9 are arranged in parallel relative to each other. The guide rails 9 are fixedly set at the upper end of the furnace body 2, serving as the guiding basis for the movement of the furnace door 13. A set of pulleys 14 is provided on each side of the front end of the furnace door 13. The pulleys 14 are set on the guide rails 9 and can slide along the guide rails 9.

[0062] The fixed base 11 is located on the rear side of the furnace door 13 and is fixed to the upper end of the furnace body 2. The end of the transmission rod 10 is connected to the fixed base 11 through a bearing, so that the transmission rod 10 can rotate relative to the fixed base 11.

[0063] The cylinder base 19 is fixedly mounted on the furnace shell 1. The rodless end cap of the cylinder 18 is hinged to the cylinder base 19, and the cylinder 18 is located on the rear side of the fixed base 11. The end of the piston rod of the cylinder 18 is hinged to the rear end of the first tilting arm 12. The front end of the first tilting arm 12 is fixedly connected to the transmission rod 10. By raising or lowering the lifting rod, the rear end of the first tilting arm 12 is raised or lowered, causing the transmission rod 10 to rotate.

[0064] The second tilting arm 15 is located on the left and / or right side of the furnace door 13. The front end of the second tilting arm 15 is hinged to the side surface of the furnace door 13, and the rear end is fixedly connected to the transmission rod 10. The hinge point between the second tilting arm 15 and the furnace door 13 is located at the rear of the furnace door 13. Two sets of the second tilting arm 15 can be provided. When two sets are provided, they are respectively located on the left and right sides of the furnace door 13. When only one set of the second tilting arm 15 is provided, it is located on either the left or right side of the furnace door 13.

[0065] When the piston rod of cylinder 18 retracts, it drives the transmission rod 10 to rotate via the first tilting arm, causing the front end of the second tilting arm to lift upwards, which in turn causes the rear part of the furnace door 13 to rise upwards. The front end of the furnace door 13 slides backwards along the guide rail 9, thus opening the furnace door 13. When the furnace door 13 needs to be closed, the piston rod of cylinder 18 extends, and drives the transmission rod 10 to rotate via the first tilting arm, causing the front end of the second tilting arm to fall downwards, which in turn causes the rear part of the furnace door 13 to fall downwards, causing the front end of the furnace door 13 to slide forwards along the guide rail 9, thus closing the furnace door 13.

[0066] With the above settings, the furnace door 13 can be opened and closed automatically, while the heat inside the furnace body 2 radiates upwards, improving work safety. At the same time, the opening size of the furnace door 13 can be adjusted by the lifting rod to avoid heat waste.

[0067] As a supplement to the technical solution of this utility model, the guide rail 9 includes a slide plate 16 and a limiting plate 17. The bearing part is a plate-shaped structure, and the upper end of the bearing part is used to support the pulley 14, so that the pulley 14 can slide on the bearing part.

[0068] The limiting plate 17 is a plate-shaped structure with a bent edge at the upper end. The lower end of the limiting plate 17 is connected to the side surface of the bearing part. The bent edge at the upper end of the limiting plate 17 is located above the slide plate 16, so that the limiting plate 17 and the slide plate 16 form a groove for accommodating the pulley 14, allowing the pulley 14 to slide within the specified groove and providing safety performance. At the same time, the setting of the limiting plate 17 can improve the overall structural strength of the track.

[0069] As a supplement to the above technical solution, the front end of the slide plate 16 is provided with a downward inclined angle, so that when the pulley 14 slides to the inclined position, the weight of the furnace door 13 is transferred to the furnace body 2, realizing the self-pressurizing design of the furnace door 13 and improving the sealing performance of the furnace door 13.

[0070] As a preferred technical solution of this utility model, the furnace door 13 includes a furnace door frame 20, a furnace door cover plate 21, an inner lining plate fixing beam 22, a fixing screw, and an inner lining plate 24.

[0071] The furnace door frame 20 is a square frame structure with a square through hole in the middle. The furnace door cover plate 21 is fixedly connected to the furnace door frame 20 and is located at the square through hole. The furnace door frame 20 and the furnace door cover plate 21 together form a groove structure with an opening at the bottom.

[0072] The inner lining plate fixing beam 22 is located below the furnace door cover plate 21, and the end of the inner lining plate fixing beam 22 is fixedly connected to the furnace door frame 20. The upper end of the fixing screw is fixedly connected to the inner lining plate fixing beam 22, and the lower end of the fixing screw is screwed to the inner lining plate 24 by a nut. The inner lining plate 24 is used to seal the upper opening of the furnace body 2.

[0073] The above settings improve the structural stability of the furnace door 13.

[0074] As a supplement to the above technical solution, the inner lining plate 24 includes a heat insulation plate assembly and an outer plate 32.

[0075] The heat insulation plate assembly includes a first heat insulation plate 25, a second heat insulation plate 26, a third heat insulation plate 27, a fourth heat insulation plate 28, a U-shaped connecting plate 29, and a clamping base plate 30.

[0076] The first heat insulation plate 25, the second heat insulation plate 26, the third heat insulation plate 27, and the fourth heat insulation plate 28 are all square plate structures. The four sets of heat insulation plates are arranged in pairs and spaced apart. In adjacent pairs of plates, the adjacent sides are bent downwards at a bending angle of 90 degrees. The U-shaped connecting plate 29 is a plate structure with a U-shaped cross-section. A U-shaped connecting plate 29 is provided between every two adjacent square plates. The lower end of the bent square plate is located in the groove of the U-shaped connecting plate 29 and is connected to the bottom end of the groove of the U-shaped connecting plate 29. The upper end of the U-shaped connecting plate 29 is fixedly connected to the bottom surface of the corresponding heat insulation plate.

[0077] The clamping base plate 30 is disposed between two adjacent sets of heat insulation plates and above the heat insulation plates. A through hole is opened in the middle of the clamping base plate 30, and the lower end of the clamping base plate 30 contacts the upper end of the heat insulation plate. The U-shaped connecting plate 29 is provided with a through hole for fixing the screw to pass through.

[0078] The fixing screw includes a first fixing screw 23, which includes a rod-shaped part and a threaded part. The rod-shaped part is a cylindrical structure with no threads on its outer surface. The diameter of the threaded part is smaller than that of the rod-shaped part, and its outer surface is threaded. The diameter of the through hole on the clamping base plate 30 is the same as the diameter of the threaded part of the fixing screw. The threaded part of the first fixing screw 23 passes through the clamping base plate 30, then passes between the adjacent heat insulation plates of the beam, and finally passes through the U-shaped connecting plate 29. The nut is screwed onto the threaded part below the U-shaped connecting plate 29. The clamping base plate 30, the heat insulation plate, and the U-shaped connecting plate 29 are clamped and fixed by the rod-shaped part of the fixing screw and the nut.

[0079] As a supplement to the above technical solution, the inner lining plate 24 also includes an outer perimeter plate 32. The outer perimeter plate 32 is formed into a Z-shaped structure by bending, including a connecting part, a bending part, and a bottom plate part. The connecting part and the bottom plate part are both arranged horizontally, and the bending part is arranged vertically. The connecting part is located at the upper end of the bending part, and the bottom plate part is located at the lower end of the bending part, forming a Z-shaped structure through the connecting part, the bending part, and the bottom plate part. The outer perimeter plate 32 is disposed on the outer edge of the heat insulation plate assembly, and the connecting part of the outer perimeter plate 32 overlaps the upper surface of the heat insulation plate assembly.

[0080] The fixing screw also includes a second fixing screw 31, which has the same structure as the first fixing screw 23. The second fixing screw 31 passes through the connecting part of the outer plate 32 and the heat insulation plate assembly, and is then screwed onto the threaded part of the second fixing screw 31 with a nut. This allows the rod-shaped part of the second fixing screw 31 and the nut to clamp and fix the connecting part of the outer plate 32 and the heat insulation plate assembly. The upper end of the second fixing screw 31 is fixedly connected to the inner lining plate fixing beam 22. Through the above configuration, the second fixing screw 31 applies an upward pulling force to the outer edge of the heat insulation plate assembly, further improving the structural stability of the heat insulation plate assembly. This avoids the technical problem of the first fixing screw 23 applying an upward pulling force between two adjacent heat insulation plates in the heat insulation plate assembly, resulting in poor structural stability of the heat insulation plate assembly. At the same time, the bottom plate of the outer plate 32 is used to directly contact the upper end of the furnace body 2. By splicing the outer plate 32 and the heat insulation plate assembly to form an integral inner lining plate 24, the opening at the upper end of the furnace body 2 is sealed, ensuring the heat insulation effect and increasing the sealing performance.

[0081] The lower surface of the inner lining plate 24 is also provided with thermal insulation material.

[0082] As a preferred embodiment of this invention, the furnace door 13 further includes a supporting connecting rod 33, which is disposed at the upper end of the furnace door frame 20. The upper end of the furnace door frame 20 has a protrusion with a through hole. The supporting connecting rod 33 passes through the through hole of the protrusion on the furnace door frame 20, and its end is hinged to the second tilting arm. The second tilting arm pulls the supporting connecting rod 33 upwards, causing the furnace door 13 to open and close as a whole.

[0083] The second tilting arm is provided in two sets, with one set of tilting arms located on each side of the furnace door 13. The front ends of both sets of tilting arms are hinged to the end of the support rod 33.

[0084] As a preferred technical solution of this utility model, the furnace door assembly 8 further includes a pneumatic system, which includes a triplet 34, a solenoid valve 35, a first speed regulating valve 36, a second speed regulating valve 37, a first air-induced check valve 38, a second air-induced check valve 39, a first main pipeline 40, a second main pipeline 41, a first branch pipeline 42, a second branch pipeline 43, a third branch pipeline 44, and a fourth branch pipeline 45.

[0085] The cylinder 18 is a double-acting cylinder 18.

[0086] The triplet 34 is connected to the solenoid valve 35 via a pipeline. One end of the first main pipeline 40 is connected to the solenoid valve 35, and the other end is provided with a first tee fitting. One end of the first branch pipeline 42 is connected to the first outlet of the first tee fitting, and the other end is connected to the first speed regulating valve 36. One end of the second branch pipeline 43 is connected to the second outlet of the first tee fitting, and the other end is connected to the induction port of the second air-induced check valve 39.

[0087] One end of the second main pipe 41 is connected to the solenoid valve 35, and the other end is provided with a second tee fitting. One end of the third branch pipe 44 is connected to the first outlet of the second tee fitting, and the other end is connected to the second speed regulating valve 37. One end of the fourth branch pipe 45 is connected to the second outlet of the second tee fitting, and the other end is connected to the induction port of the first air-induced check valve 38.

[0088] The first speed control valve 36 is connected to the inlet of the first air-induced check valve 38, and the outlet of the first air-induced check valve 38 is connected to the first air port of the cylinder 18.

[0089] The second speed control valve 37 is connected to the inlet of the second air-induced check valve 39, and the outlet of the second air-induced check valve 39 is connected to the second air port of the cylinder 18.

[0090] The triple unit 34 filters moisture and other impurities in the pneumatic pipeline and stabilizes the pressure in the pipeline within the range of 0.4-0.6 MPa.

[0091] With the above settings, as Figure 15 As shown, when the piston rod of cylinder 18 needs to retract, gas is supplied to the first main pipeline 40 via solenoid valve 35. The gas then enters cylinder 18 through the first air port via the first speed control valve 36 and the first air-induced check valve 38, causing the piston rod to retract. During retraction, the second air-induced check valve 39 prevents cylinder 18 from falling when the gas supply is cut off. When the piston rod of cylinder 18 needs to extend, gas is supplied to the second main pipeline 41 via solenoid valve 35. The gas then enters cylinder 18 through the second air port via the second speed control valve 37 and the second air-induced check valve 39, causing the piston rod to extend. During extension, the first air-induced check valve 38 prevents cylinder 18 from falling when the gas supply is cut off.

[0092] The above settings can effectively adjust the opening and closing speed of the furnace door 13, preventing the risk of impact caused by excessive speed.

[0093] The above description is only a preferred embodiment of the present invention, but the protection scope 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 included within the protection scope of the present invention.

Claims

1. A hot air circulating mold heating furnace, characterized in that, Includes furnace shell (1), furnace body (2), heating device (3), mold support (4), furnace door assembly (8), fan impeller (6), guide plate (7), and baffle plate (46); The furnace shell (1) and the furnace body (2) are both hollow groove structures with openings at the top. The furnace body (2) is located inside the furnace shell (1), and a heat insulation layer is provided between the furnace body (2) and the furnace shell (1). The furnace door assembly (8) is located at the upper end of the furnace body (2), the mold support (4) is located inside the furnace body (2), the heating device (3) is located below the mold support (4), the fan impeller (6) is located on the rear side wall of the furnace body (2), and the shaft of the fan impeller (6) is connected to the side wall of the furnace body (2) through a bearing. An arc-shaped guide plate (7) is provided at the corner position between the rear side wall and the bottom wall of the furnace body (2). A baffle plate (46) is located on the front side of the fan impeller (6). The upper end of the baffle plate (46) is flush with the upper end of the furnace body (2), and the lower end of the baffle plate (46) is at a certain distance from the bottom end of the furnace body (2).

2. The hot air circulating mold heating furnace according to claim 1, characterized in that, It also includes a round hole on the wind deflector (46) and reinforcing ribs on the side surface of the wind deflector (46).

3. A hot air circulating mold heating furnace according to claim 1, characterized in that, It also includes a motor (5), which is mounted on the furnace shell (1). The shaft of the fan impeller (6) passes through the furnace body (2) and the furnace shell (1) and is connected to the motor (5) by a belt.

4. A hot air circulating mold heating furnace according to claim 1, characterized in that, The furnace door assembly (8) includes a guide rail (9), a transmission rod (10), a cylinder (18), a cylinder base (19), a fixed base (11), a first tilting arm (12), a furnace door (13), a pulley (14), and a second tilting arm (15). The guide rail (9) is located at the upper end of the furnace body (2), and a pulley (14) is provided on the front side surface of the furnace door (13), with the pulley (14) located on the guide rail (9); The fixed base (11) is located on the rear side of the furnace door (13) and is fixedly connected to the furnace shell (1). The transmission rod (10) is connected to the fixed base (11) through a bearing. The cylinder base (19) is set on the furnace shell (1), the rodless side end cap of the cylinder (18) is hinged to the cylinder base (19), the piston rod of the cylinder (18) is hinged to the rear end of the first tilting arm, and the front end of the first tilting swing arm (12) is fixedly connected to the transmission rod (10). The second tilting arm (15) is located on the left and / or right side of the furnace door (13). The front end of the second tilting arm (15) is hinged to the rear of the furnace door (13), and the rear end is fixedly connected to the transmission rod (10).

5. A hot air circulating mold heating furnace according to claim 4, characterized in that, The furnace door (13) includes a furnace door frame (20), a furnace door cover plate (21), an inner lining plate fixing beam (22), a fixing screw, and an inner lining plate (24). The furnace door frame (20) is a square frame structure with a square through hole in the middle. The furnace door cover plate (21) is located at the square through hole of the furnace door frame (20) and is fixedly connected to the furnace door frame (20). The furnace door frame (20) and the furnace door cover plate (21) together form a groove structure with an opening at the bottom. The inner lining plate fixing beam (22) is located below the furnace door cover plate (21), and the end of the inner lining plate fixing beam (22) is fixedly connected to the furnace door frame (20). The upper end of the fixing screw is fixedly connected to the inner lining plate fixing beam (22), and the lower end of the fixing screw is screwed to the inner lining plate (24) by a nut.

6. A hot air circulating mold heating furnace according to claim 5, characterized in that, The inner lining panel (24) includes a heat insulation panel assembly. The heat insulation plate assembly includes a heat insulation plate, a U-shaped connecting plate (29), and a clamping base plate (30). The heat insulation plate is provided in four groups, all of which are square plate structures. The four groups of heat insulation plates are arranged in pairs and spaced apart. In the two adjacent groups of heat insulation plates, the adjacent sides are bent downwards. The U-shaped connecting plate (29) is a plate structure with a U-shaped cross section. A U-shaped connecting plate (29) is provided between each two adjacent square plates. The lower end of the heat insulation plate after bending is located in the groove of the U-shaped connecting plate (29) and abuts against the bottom end of the groove of the U-shaped connecting plate (29). The upper end of the U-shaped connecting plate (29) is fixedly connected to the bottom surface of the corresponding heat insulation plate. The top-tightening base plate (30) is placed on two adjacent sets of heat insulation plates; The fixing screw includes a first fixing screw (23), which includes a rod-shaped part and a threaded part. The rod-shaped part is a cylindrical structure with no threads on its outer surface. The diameter of the threaded part is smaller than that of the rod-shaped part, and its outer surface is threaded. The threaded part of the first fixing screw (23) passes through the top clamping plate (30) and the U-shaped connecting plate (29), and the nut is screwed onto the threaded part.

7. A hot air circulating mold heating furnace according to claim 6, characterized in that, The inner lining plate (24) also includes an outer plate (32), which includes a connecting part, a bending part, and a bottom plate. The connecting part and the bottom plate are arranged horizontally, the bending part is arranged vertically, the connecting part is located at the upper end of the bending part, and the bottom plate is located at the lower end of the bending part, so that the outer plate (32) is a Z-shaped structure. The outer plate (32) is located on the outer edge of the heat insulation plate assembly, and the connecting part of the outer plate (32) is attached to the upper surface of the heat insulation plate assembly. The fixing screw also includes a second fixing screw (31), which has the same structure as the first fixing screw (23). The threaded part of the second fixing screw (31) passes through the connecting part of the outer plate (32) and the heat insulation plate assembly. A nut is screwed onto the threaded part of the second fixing screw (31) to clamp and fix the connecting part of the outer plate (32) and the heat insulation plate assembly. The upper end of the second fixing screw (31) is fixedly connected to the inner lining plate fixing beam (22).

8. A hot air circulating mold heating furnace according to claim 5, characterized in that, The furnace door (13) also includes a support rod (33), which is located at the upper end of the furnace door frame (20). The upper end of the furnace door frame (20) has a protrusion, and the support rod (33) passes through the through hole of the protrusion on the furnace door frame (20). The end of the support rod (33) is hinged to the second tilting arm.

9. A hot air circulating mold heating furnace according to claim 4, characterized in that, The furnace door assembly (8) also includes a pneumatic system, which includes a triplet (34), a solenoid valve (35), a first speed control valve (36), a second speed control valve (37), a first air-induced check valve (38), a second air-induced check valve (39), a first main pipeline (40), a second main pipeline (41), a first branch pipeline (42), a second branch pipeline (43), a third branch pipeline (44), and a fourth branch pipeline (45). The triplet (34) is connected to the solenoid valve (35) through a pipeline. One end of the first main pipeline (40) is connected to the solenoid valve (35), and the other end is provided with a first tee fitting. One end of the first branch pipeline (42) is connected to the first outlet of the first tee fitting, and the other end is connected to the first speed regulating valve (36). One end of the second branch pipeline (43) is connected to the second outlet of the first tee fitting, and the other end is connected to the induction port of the second air-induced check valve (39). One end of the second main pipeline (41) is connected to the solenoid valve (35), and the other end is provided with a second three-way fitting. One end of the third branch pipeline (44) is connected to the first outlet of the second three-way fitting, and the other end is connected to the second speed regulating valve (37). One end of the fourth branch pipeline (45) is connected to the second outlet of the second three-way fitting, and the other end is connected to the induction port of the first air-induced check valve (38). The first speed control valve (36) is connected to the inlet of the first air-induced check valve (38), and the outlet of the first air-induced check valve (38) is connected to the first air port of the cylinder (18). The second speed control valve (37) is connected to the inlet of the second air-induced check valve (39), and the outlet of the second air-induced check valve (39) is connected to the second air port of the cylinder (18).

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