Mold shell firing device for investment casting

Abstract

The invention discloses a mold shell firing device for investment casting, and relates to the technical field of metal part casting manufacturing, the mold shell firing device comprises an outer box, and further comprises an inner box fixedly mounted in the outer box; a first partition plate and a second partition plate are jointly and fixedly installed between the outer box and the inner box, the space between the outer box and the inner box is divided into two cavities through the first partition plate and the second partition plate, a plurality of outer heating rods are fixedly installed in the two cavities, and an air inlet unit and an air outlet unit are fixedly installed outside the outer box; and two air holes are formed in the side edge of the inner box. The mold shell firing device has the advantages that when a mold shell is fired, airflow which regularly swings up and down can be formed in the inner box, the airflow always flows in one direction, so that the mold shell is heated more uniformly, the firing quality of the mold shell is improved, in addition, the flow speed of the airflow located on the upper portion in the inner box can be changed, air in the mold shell can be sucked out, and the firing quality of the mold shell is improved. And the interior of the mold shell is uniformly heated.

Description

Technical Field

[0001] The present invention relates to the technical field of metal part casting production, and in particular to a mold shell firing device for investment casting. Background Art

[0002] A mold shell is a mold shell for casting metal parts, which is composed of molten wax and sand or ceramic. The molten wax is wrapped with sand or ceramic on the outside, and then the sand or ceramic is fired and solidified. At this time, the molten wax will melt and flow out, and the remaining solidified sand or ceramic is the formed mold shell for casting metal parts.

[0003] The existing firing is completed by high-temperature firing equipment. However, during the firing of the existing firing equipment, the mold shell is unevenly heated. Therefore, the patent with publication number CN117128761B discloses a firing kiln for processing coffee cups, which includes a firing kiln device and a ventilation duct installed inside the firing kiln device. One end of the ventilation duct is connected to a fan. A kiln chamber is opened inside the firing kiln device. A rotating chuck is rotatably connected inside the firing kiln device. A rotating chassis is installed on the bottom surface of the rotating chuck. A plurality of blowing plates are evenly distributed and installed on the outer surface of the rotating chassis. The blowing plates are provided with inclined surfaces. A number of main heat dissipation holes are evenly opened in the middle of the rotating chuck.

[0004] Through the interaction of the rotating chuck, the bottom blowing component, the side blowing component and the upper blowing component, the above-mentioned firing kiln can apply air blowing to the bottom, side and inside of the coffee cup clay sculpture, which can increase the area of hot air circulation and heat transfer quickly, accelerate the sintering process of the coffee cup clay sculpture, shorten the firing time, realize the uniform sintering of each part of the ceramic coffee cup clay sculpture, obtain better quality and strength of the coffee cup clay sculpture, and make the bottom, side and inside fully heated and sintered, so that the entire coffee cup clay sculpture structure is more solid, avoid flaws or breakage, reduce defects and non-uniformity caused by bubbles, and help improve the appearance quality and perception of the coffee cup; Through the cooperation of the limiting ring and the extension plate, the two limiting rings limit and fix the bottom of the coffee cup clay sculpture, and the extension plate blocks the redundant main heat dissipation holes, so that the longitudinal air flow only contacts the bottom of the coffee cup body specifically, avoiding the longitudinal air flow affecting the air flow in the side direction and improving the firing efficiency.

[0005] However, when the above-mentioned firing kiln is specifically used, there are many air flow directions, which are likely to form turbulence and pulsating air flow in the firing kiln. The turbulence will cause uneven heating of the mold shell, resulting in bubbles in the mold shell and even cracking of the mold shell.

[0006] Therefore, a new mold shell firing device for investment casting can be adopted to solve the deficiencies of the prior art. Summary of the Invention

[0007] The object of the present invention is to solve the problem in the prior art that the unstable air flow affects the firing quality, and to propose a mold shell firing device for investment casting.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions: A mold shell firing device for investment casting, including an outer box, and further including an inner box fixedly installed inside the outer box; A first partition and a second partition are fixedly installed together between the outer box and the inner box. The first partition and the second partition divide the space between the outer box and the inner box into two cavities. A plurality of outer heating rods are fixedly installed in both of the two cavities. An air intake unit and an air outlet unit are fixedly installed outside the outer box. Two air holes are opened on the side of the inner box, and the two air holes are respectively located in the two cavities; A placement disk is rotatably installed inside the inner box. A driving component matched with the placement disk is installed at the bottom of the outer box. An air outlet box and an air intake box are respectively fixedly installed on two side walls inside the inner box. Through holes matched with the corresponding air holes are opened on both the air intake box and the air outlet box. A plurality of one-way air intake heads are fixedly installed on the air intake box. A plurality of one-way air outlet heads are fixedly installed on the air outlet box. A plurality of inner heating rods are fixedly installed inside the inner box. An air intake component and a plurality of wind direction adjusting components matched with the plurality of one-way air intake heads are installed inside the air intake box. A top baffle matched with the uppermost wind direction adjusting component is fixedly installed on the air intake box.

[0009] Preferably, the driving component includes a rotating unit fixedly installed at the bottom of the outer box. A shaft rod is fixedly installed at the driving end of the rotating unit. The shaft rod penetrates through the outer box and the inner box and is fixedly connected with the placement disk.

[0010] Preferably, a cooling unit is fixedly installed on the side of the outer box. The cooling unit is communicated with the air outlet unit and is used for cooling the high-temperature gas discharged from the air outlet unit.

[0011] Preferably, the air intake component includes a plurality of baffles fixedly installed inside the air intake box. The plurality of baffles divide the inside of the air intake box into a plurality of air chambers. Each air chamber corresponds to a row of corresponding one-way air intake heads. A first piston plate and a second piston plate are slidably installed together between the two cooperating baffles. A plurality of one-way tubes are fixedly installed on both the first piston plate and the second piston plate. The plurality of first piston plates and the plurality of second piston plates are arranged alternately, and the horizontal positions of the first piston plate and the second piston plate are designed to be staggered. A pushing mechanism matched with the first piston plate and the second piston plate is installed on the outer box and the inner box.

[0012] Preferably, the pushing mechanism includes two camshafts rotatably installed at the bottom of the inner box. Both of the two camshafts are connected to the corresponding first piston plate and the second piston plate through connecting brackets. The connecting brackets are rotatably connected to the first piston plate or the second piston plate and the camshafts. An electric motor is fixedly installed outside the outer box. A connecting rod is fixedly installed on the driving end of the electric motor. The connecting rod penetrates through the outer box and extends into the air inlet box. One end of the connecting rod located in the air inlet box is connected to one of the camshafts through a second bevel gear set. A linkage structure is installed between the two camshafts.

[0013] Preferably, the linkage structure includes a linkage shaft rotatably installed at the bottom of the air inlet box. Both ends of the linkage shaft are connected to the corresponding camshafts through a first bevel gear set. A baffle plate is fixedly installed inside the inner box.

[0014] Preferably, the wind direction adjusting assembly includes a first adjusting plate fixedly installed outside the air inlet box. A second adjusting plate is rotatably installed on the first adjusting plate. A third adjusting plate is rotatably installed on the second adjusting plate. A blocking mechanism is installed between the second adjusting plate and the first adjusting plate and between the second adjusting plate and the third adjusting plate; A first rotating mechanism is installed between the second adjusting plate and one of the camshafts. A second rotating mechanism is installed between the third adjusting plate and the inner box.

[0015] Preferably, the blocking mechanism includes a first blocking piece fixedly installed on the second adjusting plate and a second blocking piece fixedly installed on the third adjusting plate. Sliding grooves are formed on both the first adjusting plate and the second adjusting plate. Sliding blocks matched with the corresponding sliding grooves are fixedly installed on both the first blocking piece and the second blocking piece. An expansion blocking plate matched with the corresponding sliding groove is fixedly installed on each of the two sliding blocks.

[0016] Preferably, the first rotating mechanism includes a telescopic rod fixedly installed on the air inlet box. A rack is fixedly installed at the telescopic end of the telescopic rod. A second gear disc meshing with the rack is fixedly installed on the second adjusting plate. An incomplete gear meshing with the rack is rotatably installed on the air inlet box. The incomplete gear is connected to the camshaft through a third bevel gear set.

[0017] Preferably, the second rotating mechanism includes a first gear disc fixedly installed on the third adjusting plate. An incomplete arc gear ring meshing with the first gear disc is fixedly installed on the side wall of the inner box.

[0018] Compared with the existing technology, the advantages of the present invention are as follows: 1. When the mold shell is fired, the mold shell firing device sets an air inlet box, an air outlet box, a one-way air inlet head and a one-way air outlet head, so that the air flow in the inner box flows horizontally and stably, and turbulence in the inner box is prevented, so that the mold shell is heated more evenly, and the firing quality of the mold shell is effectively improved.

[0019] 2. When the mold shell is fired, the camshaft is set to drive the first piston plate and the second piston plate to operate intermittently, which can ensure that there is always a stable airflow in the inner box, avoid the occurrence of pulse airflow, and further improve the heating uniformity of the mold shell.

[0020] 3. When the mold shell is fired, the present mold shell firing device changes the direction of the airflow ejected from the one-way air inlet head by setting a wind direction adjusting component, thereby forming an airflow moving up and down in the inner box. Since the airflow changes slowly, air can be blown to different positions of the mold shell, so that the mold shell is heated more evenly. In addition, the top baffle is used to change the airflow velocity at the top of the inner box, and the gas inside the mold shell is sucked out according to the flow velocity difference, so that the inside of the mold shell is heated evenly.

[0021] 4. When the mold shell is fired, the first sealing piece and the second sealing piece are set to seal the gap between the first adjustment plate and the second adjustment plate and between the second adjustment plate and the third adjustment plate to prevent the airflow from entering the gap and causing airflow fluctuations, thereby improving the stability of the airflow and thus improving the firing quality.

[0022] To sum up, when the mold shell is fired, the present invention can form an airflow with regular up and down swings in the inner box, and the direction of the airflow always flows in one direction, so that the mold shell is heated more evenly and the firing quality of the mold shell is improved. In addition, the flow rate of the airflow at the upper part of the inner box will change, and the gas inside the mold shell can be sucked out, so that the inside of the mold shell is heated evenly. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings, wherein: Figure 1 A schematic diagram of the structure of a mold shell firing device for investment casting proposed by the present invention; Figure 2 for Figure 1 Detailed schematic diagram of the structure after being rotated to a certain angle; Figure 3 for Figure 1 Detailed diagram of the structure after the outer box is cut open and rotated to a certain angle; Figure 4 for Figure 3 Detailed diagram of the structure of the inner box after it is cut open; Figure 5 for Figure 4Schematic detail drawing of the structure after rotating a certain angle; Figure 6 For Figure 5 Schematic detail drawing of the enlarged structure of the rotating unit and the placement tray in Figure 7 For Figure 5 Schematic detail drawing of the structure of the air intake box and the inner box after sectioning in Figure 8 For Figure 7 Schematic detail drawing of the structure of the inner box and its surrounding components after rotating a certain angle in Figure 9 For Figure 7 Schematic detail drawing of the structure of the inner box after removing its top in Figure 10 For Figure 9 Schematic detail drawing of the planar structure along one of the angles in Figure 11 For Figure 10 Schematic detail drawing of the planar structure of the A - A cross - section of the eye in Figure 12 For Figure 10 Schematic detail drawing of the three - dimensional structure along the A - A cross - section in Figure 13 For Figure 12 Schematic detail drawing of the structure after removing the air intake box in Figure 14 For Figure 13 Schematic detail drawing of the camshaft and one of the wind direction adjustment components in Figure 15 For Figure 14 Schematic detail drawing of the enlarged structure of part B in Figure 16 For Figure 14 Schematic detail drawing of the planar structure of the wind direction adjustment component in Figure 17 For Figure 14 Schematic detail drawing of the planar structure of the pressure adjustment along one of the angles in Figure 18 For Figure 17 Schematic detail drawing of the three - dimensional structure along the C - C cross - section.

[0024] In the figure: 1 outer box, 2 intake unit, 3 exhaust unit, 4 rotating unit, 5 inner box, 6 outer heating rod, 7 first partition, 8 second partition, 9 exhaust box, 10 inner heating rod, 11 motor, 12 one-way exhaust head, 13 intake box, 14 placement tray, 15 hook, 16 top baffle, 17 wind direction adjustment component, 18 incomplete arc gear ring, 19 one-way intake head, 20 incomplete gear, 21 baffle, 22 air baffle, 23 linkage shaft, 24 first bevel gear set, 25 first piston plate, 26 camshaft, 27 second piston plate, 28 second bevel gear set, 29 first adjustment plate, 30 second adjustment plate, 31 third adjustment plate, 32 first gear disc, 33 second gear disc, 34 rack, 35 telescopic rod, 36 third bevel gear set, 37 first sealing piece, 38 second sealing piece, 39 sliding groove, 40 telescopic sealing plate. Specific embodiments

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] Embodiment 1: Refer to Figures 1 - 6 , Figures 8 - 9 , a mold shell firing device for investment casting, including an outer box 1, and further including an inner box 5 fixedly installed inside the outer box 1; A first partition 7 and a second partition 8 are fixedly installed between the outer box 1 and the inner box 5. The first partition 7 and the second partition 8 divide the space between the outer box 1 and the inner box 5 into two cavities. A plurality of outer heating rods 6 are fixedly installed in both cavities. An intake unit 2 and an exhaust unit 3 are fixedly installed outside the outer box 1. Two air holes are opened on the side of the inner box 5, and the two air holes are respectively located in the two cavities; Both the intake unit 2 and the exhaust unit 3 are existing devices. The intake unit 2 is used to inject gas between the outer box 1 and the inner box 5, and the exhaust unit 3 sucks out the gas between the outer box 1 and the inner box 5.

[0027] The intake unit 2 introduces the gas into the left cavity, and then the gas enters the inner box 5 through the left cavity and the left air hole (it is measured that the position close to label 1 is the left side, and the position close to label 5 is the right side). The air holes are opened on the left and right sides of the inner box 5, while the intake unit 2 and the exhaust unit 3 are respectively located at the front and rear positions. Figure 3 The position of the air hole is on the left and right sides of the inner box 5, and the intake unit 2 and the exhaust unit 3 are respectively located at the front and rear positions.

[0028] The external heating rod 6 is used to heat the space between the outer box 1 and the inner box 5. When the gas enters this space, it will be heated and then enter the inner box 5 through the air holes, ensuring that the mold shell is heated stably. Both spaces need to be heated to ensure that the temperature around the inner box 5 is uniform and stable.

[0029] A placement tray 14 is rotatably installed in the inner box 5. Hooks 15 are fixedly installed on the placement tray 14. A driving assembly matched with the placement tray 14 is installed at the bottom of the outer box 1. And an air outlet box 9 and an air inlet box 13 are respectively fixedly installed on two side walls in the inner box 5. Through holes matched with the corresponding air holes are formed in both the air inlet box 13 and the air outlet box 9. The driving assembly includes a rotating unit 4 fixedly installed at the bottom of the outer box 1. A shaft rod is fixedly installed at the driving end of the rotating unit 4. The shaft rod penetrates through the outer box 1 and the inner box 5 and is fixedly connected with the placement tray 14.

[0030] Place the mold shell on the placement tray 14 or hang it on the hook 15, and then drive the placement tray 14 to rotate through the rotating unit 4. When rotating, it will drive the mold shell to rotate. Since the air flow direction is constant, rotating the mold shell will enable the mold shell to be blown by the air flow in all directions, making the mold shell heated more evenly.

[0031] A plurality of one-way air inlet heads 19 are fixedly installed on the air inlet box 13. A plurality of one-way air outlet heads 12 are fixedly installed on the air outlet box 9. A plurality of inner heating rods 10 are fixedly installed in the inner box 5. The inner heating rods 10 are used for high-temperature firing of the mold shell in the inner box 5.

[0032] Both the one-way air outlet heads 12 and the one-way air inlet heads 19 adopt a wide-mouth design, and the ejected gas will diffuse, so that the ejected gas can cover any position inside the inner box 5.

[0033] A cooling unit is fixedly installed on the side of the outer box 1. The cooling unit is communicated with the air outlet unit 3 and is used to cool down the high-temperature gas discharged from the air outlet unit 3, which can effectively reduce the safety risk of direct hot gas emission.

[0034] Embodiment 2: The difference between this embodiment and the technical solution of Embodiment 1 lies in: Refer to Figures 1 - 5 、 Figure 7 、 Figures 9 - 18 An air inlet assembly and a plurality of wind direction adjusting assemblies 17 matched with the plurality of one-way air inlet heads 19 are installed in the air inlet box 13. A top baffle 16 matched with the uppermost wind direction adjusting assembly 17 is fixedly installed on the air inlet box 13.

[0035] Refer to Figure 11, the top baffle 16 is non-deformable. When the top air direction adjustment component 17 operates to the topmost position, the distance between the topmost air direction adjustment component 17 and the top baffle 16 decreases at this time. At this time, the space between the two upper rows of one-way air intake heads 19 will shrink, the outlet of the ejected gas becomes narrower, and the gas flow rate increases. According to the principle of fluid pressure, the faster the flow rate, the smaller the pressure. Therefore, the lower airflow will be carried upward to take out the air inside the mold shell, replace it with new high-temperature gas, and heat the inside of the mold shell, making the heating inside and outside the mold shell more uniform (since the top air direction adjustment component 17 operates slowly, the space between the two upper rows of one-way air intake heads 19 will gradually shrink, the opening will also change gradually, and the airflow velocity will change gradually, which can ensure the stability of the airflow and prevent the occurrence of turbulence).

[0036] The air intake component includes a plurality of baffles 21 fixedly installed inside the air intake box 13. The plurality of baffles 21 divide the inside of the air intake box 13 into a plurality of air chambers. Each air chamber corresponds to a row of corresponding one-way air intake heads 19. A first piston plate 25 and a second piston plate 27 are slidably installed together between two cooperating baffles 21. A plurality of one-way tubes are fixedly installed on both the first piston plate 25 and the second piston plate 27. The plurality of first piston plates 25 and the plurality of second piston plates 27 are arranged alternately, and the horizontal positions of the first piston plate 25 and the second piston plate 27 are designed to be staggered. A pushing mechanism cooperating with the first piston plate 25 and the second piston plate 27 is installed on the outer box 1 and the inner box 5.

[0037] Reference Figures 11 - 13 , the moving directions of the first piston plate 25 and the second piston plate 27 are different. When the first piston plate 25 moves to the left (the left side here refers to Figure 11 ), the gas in the air intake box 13 will be sucked into the space between the two corresponding baffles 21 through the one-way tube. At this time, the second piston plate 27 will move to the right, and the second piston plate 27 will press the gas between the two corresponding baffles 21 out through the corresponding one-way air intake head 19. The first piston plate 25 and the second piston plate 27 operate alternately, which can continuously and stably intake and exhaust air, and will not form a pulsating airflow inside the inner box 5, having the advantage of improving the firing quality.

[0038] The pushing mechanism includes two camshafts 26 rotatably installed at the bottom of the inner box 5. Both of the two camshafts 26 are connected to the corresponding first piston plate 25 and the second piston plate 27 through connecting brackets. The connecting brackets are rotatably connected to the first piston plate 25, the second piston plate 27, and the camshafts 26 respectively. A motor 11 is fixedly installed outside the outer box 1. A connecting rod is fixedly installed on the driving end of the motor 11. The connecting rod penetrates through the outer box 1 and extends into the air intake box 13. One end of the connecting rod located inside the air intake box 13 is connected to one of the camshafts 26 through a second bevel gear set 28. A linkage structure is installed between the two camshafts 26.

[0039] When the driving end of the motor 11 rotates, it will drive one of the camshafts 26 to rotate through the connecting rod and the second bevel gear set 28. The rotation of the camshaft 26 will drive the first piston plate 25 and the second piston plate 27 to move through the connecting bracket (the moving directions of the first piston plate 25 and the second piston plate 27 are opposite), so as to perform the operation of sucking gas.

[0040] The linkage structure includes a linkage shaft 23 rotatably installed at the bottom of the air inlet box 13. The two ends of the linkage shaft 23 are respectively connected to the corresponding camshafts 26 through the first bevel gear set 24. A baffle plate 22 is fixedly installed in the inner box 5.

[0041] The rotation of one of the camshafts 26 will drive the linkage shaft 23 to rotate through the first bevel gear set 24, and the linkage shaft 23 will drive the other camshaft 26 to rotate through another set of the first bevel gear set 24, so as to realize the synchronous rotation of the two camshafts 26. The two camshafts 26 are used to drive the first piston plate 25 and the second piston plate 27 to move at the same time. The two camshafts 26 are respectively located on both sides of the first piston plate 25 and the second piston plate 27, so that the first piston plate 25 and the second piston plate 27 can move more smoothly and the probability of jamming can be reduced.

[0042] The wind direction adjusting assembly 17 includes a first adjusting plate 29 fixedly installed outside the air inlet box 13. A second adjusting plate 30 is rotatably installed on the first adjusting plate 29, and a third adjusting plate 31 is rotatably installed on the second adjusting plate 30. A sealing mechanism is installed between the second adjusting plate 30 and the first adjusting plate 29 and between the second adjusting plate 30 and the third adjusting plate 31.

[0043] The sealing mechanism includes a first sealing piece 37 fixedly installed on the second adjusting plate 30 and a second sealing piece 38 fixedly installed on the third adjusting plate 31. Sliding grooves 39 are formed on both the first adjusting plate 29 and the second adjusting plate 30. Sliding blocks matched with the corresponding sliding grooves 39 are fixedly installed on both the first sealing piece 37 and the second sealing piece 38. A telescopic sealing plate 40 matched with the corresponding sliding groove 39 is fixedly installed on both sliding blocks.

[0044] Since the second adjusting plate 30 is rotatably connected to the first adjusting plate 29 and the third adjusting plate 31, the connection part is not smooth. When the gas passes through the surfaces of the first adjusting plate 29, the second adjusting plate 30 and the third adjusting plate 31, due to the recess at the connection part, when part of the gas passes through, the air flow direction will change, forming a secondary air flow. At this time, the changed air flow direction will affect the main air flow and cause the main air flow to be unstable. Therefore, the first sealing piece 37 and the second sealing piece 38 are provided to seal the gap at the connection part, so that the air flow passes through the connection part more smoothly and the probability of air flow turbulence is reduced; Since the first adjusting plate 29 and the second adjusting plate 30 are rotatably connected, and the second adjusting plate 30 and the third adjusting plate 31 are rotatably connected, the first sealing piece 37 and the second sealing piece 38 need to rotate to change their shapes. Therefore, one end of the first sealing piece 37 and the second sealing piece 38 is fixed and the other end slides, so that the shape can be freely changed; The function of the telescopic sealing plate 40 is to seal the sliding groove 39 to prevent gas from entering the sliding groove 39 to form unstable air flow.

[0045] A first rotating mechanism is installed between the second adjusting plate 30 and one of the camshafts 26; the first rotating mechanism includes a telescopic rod 35 fixedly installed on the air inlet box 13, a rack 34 fixedly installed at the telescopic end of the telescopic rod 35, and a second gear disk 33 fixedly installed on the second adjusting plate 30 and meshing with the rack 34. An incomplete gear 20 meshing with the rack 34 is rotatably installed on the air inlet box 13, and the incomplete gear 20 is connected to the camshaft 26 through a third bevel gear set 36.

[0046] When the camshaft 26 rotates, it will drive the incomplete gear 20 to rotate through the third bevel gear set 36. The rotation of the incomplete gear 20 will drive the rack 34 meshing with it to rotate, thereby driving the second gear disk 33 meshing with the rack 34 to rotate. The rotation of the second gear disk 33 drives the second adjusting plate 30 to rotate, and the rotation of the second adjusting plate 30 will drive the air flow direction to change, so that the air flow slowly moves horizontally upward.

[0047] A second rotating mechanism is installed between the third adjusting plate 31 and the inner box 5. The second rotating mechanism includes a first gear disk 32 fixedly installed on the third adjusting plate 31, and an incomplete arc-shaped gear ring 18 fixedly installed on the side wall of the inner box 5 and meshing with the first gear disk 32.

[0048] The rotation of the second adjusting plate 30 will drive the third adjusting plate 31 to make a circular motion around the axis of the second gear disk 33. When the first gear disk 32 moves to mesh with the incomplete arc-shaped gear ring 18, the rotation of the first gear disk 32 will drive the third adjusting plate 31 to rotate. After the above rotation, the second adjusting plate 30 tilts upward and the third adjusting plate 31 remains horizontal (the above reference Figure 11 ) The purpose of keeping the third adjusting plate 31 horizontal is to make the air flow blow out horizontally.

[0049] The specific operation steps of this device are as follows: Hang the mold shell on the hook 15 or place it on the placing plate 14, then close the inner box 5 and the outer box 1, heat the space between the inner box 5 and the outer box 1 through the external heating rod 6, and heat the space inside the inner box 5 through the internal heating rod 10; After heating for a certain period of time, gas is injected between the outer box 1 and the inner box 5 through the intake unit 2. The gas will enter the intake box 13 through the air holes. At this time, the motor 11 is started. The driving end of the motor 11 rotates, and will drive one of the camshafts 26 to rotate through the connecting rod and the second bevel gear set 28. The rotation of the camshaft 26 will drive the first piston plate 25 and the second piston plate 27 to move through the connecting bracket. When the first piston plate 25 moves to the left (the left side here refers to Figure 11 ), the gas in the intake box 13 will be sucked into the space between the corresponding two baffles 21 through the one-way pipe. At this time, the second piston plate 27 will move to the right, and the second piston plate 27 will press the gas between the corresponding two baffles 21 out through the corresponding one-way intake head 19.

[0050] And during the intake process, the rotation of the camshaft 26 will drive the incomplete gear 20 to rotate through the third bevel gear set 36. The rotation of the incomplete gear 20 will drive the rack 34 meshing with it to rotate, thereby driving the second gear disc 33 meshing with the rack 34 to rotate. The rotation of the second gear disc 33 drives the second adjusting plate 30 to rotate. The rotation of the second adjusting plate 30 will drive the change of the air flow direction, making the air flow move slowly horizontally upward; The rotation of the second adjusting plate 30 will drive the third adjusting plate 31 to move in a circular motion around the axis of the second gear disc 33. When the first gear disc 32 moves to mesh with the incomplete arc-shaped gear ring 18, at this time, the rotation of the first gear disc 32 will drive the third adjusting plate 31 to rotate. After the above rotation, the second adjusting plate 30 tilts upward and the third adjusting plate 31 remains horizontal (the above here refers to Figure 11 ), and the purpose of keeping the third adjusting plate 31 horizontal is to make the air flow blow out horizontally; The gas ejected through the one-way intake head 19 will pass through the mold shell, and then the gas in the inner box 5 will be sucked out of the one-way outlet head 12 through the outlet unit 3, and after being cooled by the cooling unit, it will be discharged into the air.

[0051] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A mold shell firing device for investment casting, including an outer box, characterized in that, It further includes an inner box fixedly installed inside the outer box; A first partition board and a second partition board are fixedly installed together between the outer box and the inner box. The first partition board and the second partition board divide the space between the outer box and the inner box into two cavities. A plurality of external heating rods are fixedly installed in both cavities. An air intake unit and an air outlet unit are fixedly installed outside the outer box. Two air holes are opened on the side of the inner box, and the two air holes are respectively located in the two cavities; A placement tray is rotatably installed inside the inner box. A driving component matched with the placement tray is installed at the bottom of the outer box. And an air outlet box and an air intake box are respectively fixedly installed on the two side walls inside the inner box. Through holes matched with the corresponding air holes are opened on both the air intake box and the air outlet box; A plurality of one-way air intake heads are fixedly installed on the air intake box, and a plurality of one-way air outlet heads are fixedly installed on the air outlet box. A plurality of inner heating rods are fixedly installed inside the inner box. An air intake component and a plurality of wind direction adjusting components matched with the plurality of one-way air intake heads are installed inside the air intake box. A top baffle matched with the uppermost wind direction adjusting component is fixedly installed on the air intake box.

2. The shell firing device for investment casting according to claim 1, characterized in that, The driving component includes a rotating unit fixedly installed at the bottom of the outer box. A shaft rod is fixedly installed at the driving end of the rotating unit. The shaft rod penetrates through the outer box and the inner box and is fixedly connected with the placement tray.

3. The shell firing device for investment casting according to claim 1, wherein A cooling unit is fixedly installed on the side of the outer box. The cooling unit is communicated with the air outlet unit and is used for cooling and temperature reduction of the high-temperature gas discharged from the air outlet unit.

4. The shell firing device for investment casting according to claim 1, characterized in that, The air intake component includes a plurality of baffle plates fixedly installed inside the air intake box. The plurality of baffle plates divide the inside of the air intake box into a plurality of air chambers. Each air chamber corresponds to a row of corresponding one-way air intake heads. A first piston plate and a second piston plate are slidably installed together between the two cooperating baffle plates. A plurality of one-way pipes are fixedly installed on both the first piston plate and the second piston plate. The plurality of first piston plates and the plurality of second piston plates are arranged alternately. And the horizontal positions of the first piston plate and the second piston plate are designed to be staggered. A pushing mechanism matched with the first piston plate and the second piston plate is installed on the outer box and the inner box.

5. The shell firing device for investment casting according to claim 4, characterized in that, The pushing mechanism includes two camshafts rotatably installed at the bottom of the inner box. The two camshafts are respectively connected with the corresponding first piston plate and the second piston plate through connecting brackets. The connecting brackets are rotatably connected with the first piston plate or the second piston plate and the camshafts. A motor is fixedly installed outside the outer box. A connecting rod is fixedly installed at the driving end of the motor. The connecting rod penetrates through the outer box and extends into the air intake box. One end of the connecting rod located inside the air intake box is connected with one of the camshafts through a second bevel gear set. A linkage structure is installed between the two camshafts.

6. The shell firing device for investment casting according to claim 5, characterized in that, The linkage structure includes a linkage shaft rotatably installed at the bottom of the air intake box. The two ends of the linkage shaft are respectively connected with the corresponding camshafts through a first bevel gear set. A gas baffle plate is fixedly installed inside the inner box.

7. The shell firing device for investment casting according to claim 1, characterized in that, The wind direction adjusting component includes a first adjusting plate fixedly installed outside the air intake box. A second adjusting plate is rotatably installed on the first adjusting plate. A third adjusting plate is rotatably installed on the second adjusting plate. A blocking mechanism is installed between the second adjusting plate and the first adjusting plate and between the second adjusting plate and the third adjusting plate; A first rotating mechanism is installed between the second adjusting plate and one of the camshafts, and a second rotating mechanism is installed between the third adjusting plate and the inner box.

8. The shell firing device for investment casting according to claim 7, characterized in that The blocking mechanism includes a first blocking piece fixedly installed on the second adjusting plate and a second blocking piece fixedly installed on the third adjusting plate. Sliding grooves are formed on both the first adjusting plate and the second adjusting plate. Sliding blocks that cooperate with the corresponding sliding grooves are fixedly installed on both the first blocking piece and the second blocking piece. A telescopic blocking plate that cooperates with the corresponding sliding groove is fixedly installed on each of the two sliding blocks.

9. The shell firing device for investment casting according to claim 7, wherein, The first rotating mechanism includes a telescopic rod fixedly installed on the air inlet box. A rack is fixedly installed at the telescopic end of the telescopic rod. A second gear disk meshing with the rack is fixedly installed on the second adjusting plate. An incomplete gear meshing with the rack is rotatably installed on the air inlet box. The incomplete gear is connected to the camshaft through a third bevel gear set.

10. The shell firing device for investment casting according to claim 7, characterized in that, The second rotating mechanism includes a first gear disk fixedly installed on the third adjusting plate. An incomplete arc-shaped gear ring meshing with the first gear disk is fixedly installed on the side wall of the inner box.

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