A sand core drying furnace system and design method

Abstract

The invention relates to a sand core drying furnace system and a design method, comprising a hot air system, a control system, an exhaust system, and a tray; the hot air system comprises a nozzle and a drying furnace; the nozzle comprises a vector nozzle; the drying furnace is divided into a drying furnace preheating section, a drying furnace heating section, and a drying furnace cooling section; the vector nozzle is installed on both sides of the drying furnace heating section; the control system comprises a 3D intelligent recognition system camera, a PLC, and a processor; the 3D intelligent recognition system camera collects product information, the PLC receives the product information, the processor processes the product information, and adjusts the angle of the vector nozzle accordingly; the exhaust system is arranged above the heating section of the drying furnace; a transport roller is provided in the drying furnace, the tray runs on the roller, enters from the inlet end, and comes out from the outlet end; the invention can improve energy utilization, improve production efficiency, and improve the flexibility of drying system production, especially solves the influence of small batch mixed flow production on production efficiency, which is of great significance.

Description

Technical Field

[0001] The invention belongs to the technical field of sand core drying furnaces and relates to a sand core drying furnace system and a design method. Background Art

[0002] The sand core drying furnace is mainly used for drying the surface of the sand core after coating. There are not many core technology innovations in the industry for sand core drying furnaces, especially for several technologies that are original to this application, such as nozzle structure, hot air system layout, energy saving, flexible production (multi-product mixed flow), and load tray structure. No relevant literature has been found in the industry. This application fills many technical gaps in the field of sand core drying furnaces.

[0003] Patent document CN201820585309.5 mainly achieves the advantages of simple processing and low processing cost of transmission components by improving the transmission structure. It does not involve the key core technologies mentioned in the present invention, such as vector nozzles, hot air layout, energy-saving control, intelligent control, etc.

[0004] This application mainly carries out technical innovation from the core technology of the drying furnace, such as the invention and application of vector nozzles, the invention and use of hollow slag trays, the design of hot air layout systems, intelligent control, etc., which are well reflected in automation, intelligence, and green energy saving. It is of great reference significance for the green and forward-looking development of the industry.

[0005] Patent document CN201610727798.9 mainly describes the structure of the transmission system (including rollers, trays, power rollers, travel switches, etc.) and the application of microwave heating technology. The core point is the application of microwave heating technology, which shortens the drying time of sand cores. In terms of shortening the heating time, the core lies in adopting another heating method, which is different from the heating method of this application. This patent document does not involve the key core technologies mentioned in this application, such as vector nozzles, hot air layout, energy-saving control, intelligent control, etc.

[0006] Patent document CN201510193155.6 mainly describes the electronic control aspect, improving the reliability of system control by improving PLC control and setting up master stations and substations. It does not involve the key core technologies mentioned in this application, such as vector nozzles, hot air layout, energy-saving control, intelligent control, etc.

[0007] The vector nozzle of patent document CN202010517403.9 changes the first degree of freedom of jet through the internal nozzle and changes the second degree of freedom of jet through the external nozzle. Its core principle is that the two internal and external nozzles are combined with two universal joints to achieve vector control of jet, which is different from the vector nozzle of this application in both structure and principle. Moreover, this document does not involve other technologies in the field of drying furnaces and has low similarity with this application. Summary of the invention

[0008] The technical problem to be solved by the present invention is to overcome the above-mentioned problems existing in the prior art and provide a sand core drying furnace system and a design method.

[0009] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0010] In order to solve the above technical problems, the present invention is implemented by adopting the following technical solutions:

[0011] A sand core drying furnace system, comprising a hot air system, a control system, an exhaust system, and a tray;

[0012] The hot air system includes a nozzle and a drying furnace;

[0013] The nozzle comprises a vector nozzle 7;

[0014] The drying furnace is divided into a drying furnace preheating section 3, a drying furnace heating section 4, and a drying furnace cooling section 5;

[0015] The vector nozzles 7 are installed on both sides of the heating section 4 of the drying furnace;

[0016] The control system includes a 3D intelligent recognition system camera, a PLC, and a processor;

[0017] The 3D intelligent recognition system camera collects product information, the PLC receives the product information, the processor processes the product information, and adjusts the angle of the vector nozzle 7 accordingly;

[0018] The exhaust system is arranged above the heating section of the drying furnace;

[0019] A transport roller is provided in the drying furnace, and the tray runs on the roller, enters from the inlet end, and comes out from the outlet end.

[0020] Further, the vector nozzle includes a movable connecting rod A14, a fixed connecting rod 15, a movable connecting rod B16, a movable L-shaped connecting rod 17, a fixed shaft 18, a front nozzle 19, a rear nozzle 20, and a hinge shaft;

[0021] The servo drive device acts on the right end of the movable link A14, pushing the movable link B16 forward or backward, driving the movable L-shaped link 17 to swing left and right; the movable L-shaped link 17 rotates around the fixed axis 18; the fixed link 15 is fixed;

[0022] The nozzle front end 19 is made of metal;

[0023] The rear end 20 of the nozzle is made of a high temperature resistant flexible tube and is connected to a hot air source. The hot air passes through the high temperature flexible tube, through the front end of the nozzle, and is blown out through the air outlet of the nozzle.

[0024] An air outlet 21, from which hot air is blown out;

[0025] There are 9 hinge shafts in total, which are connected with relatively rotating parts. The upper and lower surfaces of each nozzle and the front and rear ends of the movable connecting rod B16 are all connected by hinge shafts.

[0026] Further, the nozzle also includes a common nozzle 6 and a common nozzle 8 at the bottom;

[0027] The common nozzle 6 is installed on the side wall of the preheating section of the drying furnace, and the common nozzle 8 at the bottom is installed at the bottom of the drying furnace.

[0028] Furthermore, the 3D intelligent recognition system camera is arranged at the front end of the drying furnace.

[0029] Furthermore, the exhaust system includes a fan 9, an air outlet pipe 10 connected to the preheating section, and an air outlet pipe 11 connected to the heating section;

[0030] The fan 9 is arranged above the heating section of the drying furnace;

[0031] The air outlet pipe 10 connected to the preheating section is connected to the preheating section 3 of the drying furnace, and the air outlet pipe 11 connected to the heating is connected to the office heating.

[0032] Furthermore, the core of the control system is the PLC in the control cabinet, and the control cabinet and the drying oven are connected by cables.

[0033] Furthermore, the tray is a hollow slag discharge tray; including a slag discharge air inlet 22, a bottom air inlet 23, a dumping auxiliary window 24, a slag collecting trough 26, and a side wall air inlet 27;

[0034] The slag discharge air inlet 22 is used for slag discharge and hot air intake at the bottom. When the sand core falls on the air outlet, the hot air at the bottom can be blown to the bottom of the sand core for drying. The residual sand and other debris dropped from the sand core fall into the slag collecting tank 26 through this outlet.

[0035] The hot air blown out by the bottom nozzle can pass through the bottom air inlet 23 and then through the side wall air inlet 27 to the bottom surface of the sand core;

[0036] The dumping auxiliary window 24 is used to facilitate the removal and flipping of the tray;

[0037] The slag collecting trough 26 is used to collect the residual sand and debris dropped from the sand core. The bottom of the slag collecting trough is a 10° slope, and the opening end is a high point to prevent the residual sand and debris from flowing out of the slag collecting trough during the operation of the tray. ;

[0038] The hot air is blown out through the bottom nozzle, through the bottom air inlet 23, and then through the side wall air inlet 27 to the bottom of the sand core.

[0039] Furthermore, the hollow slag discharge tray also includes a support plate 25, and the support plate 25 plays a role in supporting the entire tray.

[0040] A design method for a sand core drying furnace system, characterized in that:

[0041] The drying furnace is divided into a drying furnace preheating section 3, a drying furnace heating section 4, and a drying furnace cooling section 5;

[0042] The common nozzle 6 and the common nozzle 8 at the bottom are respectively installed on the side wall and the bottom of the drying furnace, and are direct spraying type, and the angle is not adjustable;

[0043] The vector nozzles 7 are installed on both sides of the drying furnace heating section 4, and the angles are adjustable in the X and Y directions; each group of vector nozzles is arranged relative to each other at an angle of ±15° in the horizontal direction, and the air outlet tends to face the surface of the sand core.

[0044] The surfaces on both sides of the sand core can be directly blown by hot air;

[0045] Set up a control system, which includes a 3D intelligent recognition system camera, a PLC, and a processor;

[0046] The camera of the 3D intelligent recognition system collects product information, the PLC receives the product information, the processor processes the product information, and adjusts the angle of the vector nozzle 7 accordingly.

[0047] Furthermore, the drying furnace heating section is provided with two exhaust pipes, one of which acts on the preheating section and uses waste heat for preheating, and the other pipe is connected to the office heating;

[0048] A transport roller is provided in the drying furnace, and the hollow slag discharge tray runs on the roller, enters from the inlet end and comes out from the outlet end.

[0049] Compared with the prior art, the present invention has the following beneficial effects:

[0050] Compared with the existing technologies in this field, this application is original in core technologies such as nozzle structure, hot air system layout, energy saving, flexible production (multi-product mixed flow), and load tray structure. The several technologies mentioned in this application can improve energy utilization, production efficiency, and flexibility of drying system production, especially solving the impact of small-batch mixed flow production on production efficiency, which is of great significance. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The present invention will be further described below in conjunction with the accompanying drawings:

[0052] Figure 1 This is a front view of a sand core drying furnace system according to the present invention;

[0053] Figure 2 A top view of a sand core drying furnace system according to the present invention;

[0054] Figure 3a This is the main view of the vector nozzle structure;

[0055] Figure 3b It is the axonometric view of the vector nozzle structure;

[0056] Figure 3c It is the top view of the vector nozzle structure;

[0057] Figure 3d It is the top left view of the vector nozzle structure;

[0058] Figure 4a This is the main view of the hollow slag discharge tray;

[0059] Figure 4b This is the left view of the hollow slag discharge tray;

[0060] Figure 4c This is a top view of the hollow slag discharge tray;

[0061] Figure 4d This is the axonometric view of the hollow slag tray;

[0062] In the figure:

[0063] 1. 3D intelligent recognition system camera;

[0064] 2. Drying furnace body;

[0065] 3. Drying furnace preheating section

[0066] 4. Drying furnace heating section;

[0067] 5. Cooling section of drying furnace;

[0068] 6. Ordinary nozzle;

[0069] 7. Vector nozzle;

[0070] 8. Ordinary nozzle at the bottom;

[0071] 9. Fan;

[0072] 10. Connect the air outlet pipe of the preheating section;

[0073] 11. Connect the heating outlet pipe;

[0074] 12. Tray and short sand core;

[0075] 13. Tray and high sand core;

[0076] 14. Movable connecting rod A;

[0077] 15. Fix the connecting rod;

[0078] 16. Movable connecting rod B;

[0079] 17. Movable L-shaped connecting rod;

[0080] 18. Fixed axis;

[0081] 19. Nozzle front end;

[0082] 20. Rear end of nozzle;

[0083] 21. Air outlet;

[0084] 22. Slag discharge air inlet;

[0085] 23. Bottom air inlet;

[0086] 24. Tilting auxiliary window;

[0087] 25. Support plate;

[0088] 26. Slag collecting trough;

[0089] 27. Side wall air inlet. DETAILED DESCRIPTION

[0090] In order to make the purpose, technical scheme and advantages of the implementation of the present invention clearer, the technical scheme in the embodiment of the present invention will be described in more detail below in conjunction with the drawings in the embodiment of the present invention. In the drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The described embodiments are part of the embodiments of the present invention, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limitations on the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. The embodiments of the present invention are described in detail below in conjunction with the drawings.

[0091] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present invention.

[0092] The present invention is described in detail below in conjunction with the accompanying drawings:

[0093] The present invention is a sand core drying furnace system for casting. The main body is a through-type drying furnace, which heats the air through natural gas, blows the hot air into the furnace, and dries the sand cores passing through the furnace (the surface of the sand core after coating has a large water content and needs to be dried). The advantages of the present invention are high energy utilization, strong production flexibility, and high intelligence and automation. It is mainly achieved through technical means such as vector nozzles, outlet inclination layout, adjustable inclination, hollow slag tray, and 3D visual intelligent recognition. There are nozzles on both sides of the actual furnace. In order to make it clearer visually, this article hides one side of the nozzle in the figure and only retains the single side nozzle, such as Figure 1 and Figure 2 As shown. The number of nozzles shown in the figure is only a schematic representation of the function and position, and does not represent the actual number. Ordinary straight nozzles are arranged at the bottom of the furnace, ordinary straight nozzles are arranged on the two side walls of the preheating section, and vector nozzles are arranged on both sides of the heating section. For the nozzles on the side walls, only the upper, middle and lower layers are drawn in the three-dimensional diagram, representing the upper, middle and lower areas, namely the upper nozzle area, the middle nozzle area and the lower nozzle area. Each nozzle area may have several nozzles according to the needs of different customers (different products).

[0094] 1. System structure diagram

[0095] A sand core drying furnace system, comprising a hot air system, a control system, an exhaust system, and a tray;

[0096] The hot air system includes nozzles and drying furnace;

[0097] The nozzles include a common nozzle 6, a vector nozzle 7, and a common nozzle 8 at the bottom;

[0098] The drying furnace is divided into a drying furnace preheating section 3, a drying furnace drying section 4, and a drying furnace cooling section 5;

[0099] The common nozzle 6 is installed on the side wall of the preheating section of the drying furnace, the bottom common nozzle 8 is installed on the bottom of the drying furnace, and the vector nozzle 7 is installed on both sides of the drying section 4 of the drying furnace;

[0100] The control system includes a 3D intelligent recognition system camera, a control unit, and a processor;

[0101] The 3D intelligent recognition system camera is set at the front end of the drying furnace;

[0102] The 3D intelligent recognition system camera collects product information, the control unit receives the product information, the processor processes the product information, and adjusts the angle of the vector nozzle 7 accordingly;

[0103] The exhaust system includes a fan 9, an air outlet pipe 10 connected to the preheating section, and an air outlet pipe 11 connected to the heating section;

[0104] The air outlet duct 10 is connected to the preheating section 3 of the drying furnace, and the air outlet duct 11 is connected to the office heating (only the air outlet duct 11 is drawn in the figure, and the office heating system connected thereto is not drawn in the figure);

[0105] The fan 9 is arranged above the heating section of the drying furnace.

[0106] The core of the control system is the PLC in the control cabinet. The control cabinet (PLC) and the heating furnace are connected by cables, which are not shown in the diagram.

[0107] A transport roller is provided in the drying furnace, and the pallet runs on the roller, enters from the entrance end and comes out from the exit end.

[0108] 2. Workflow:

[0109] The sand core after coating is placed on a tray, conveyed by a roller conveyor, and enters the main body of the drying furnace. It is first preheated in the preheating section, then dried in the heating section, and then cooled in the cooling section before being taken out of the furnace. The drying is completed.

[0110] (1) 3D vision at the entrance can identify the product type (mainly the height and thickness of the product, which determine the angle adjustment of the vector nozzle) and pass the information to the processor, which stores and identifies the data.

[0111] (2) The sand core enters the preheating section. The preheating section uses an ordinary straight nozzle. The sand core is preheated by the preheating of the heating section, which improves the efficiency and quality of sand core drying and avoids the risk of cracks on the surface caused by rapid heating.

[0112] (3) When the sand core enters the heating section, the processor adjusts the angle of the vector nozzle in the heating section according to the product parameters (height, thickness) received from the 3D vision system to ensure that the air outlet blows over the sand core surface as large an area as possible.

[0113] (4) After drying is completed, the sand core enters the cooling section for cooling and then is taken out of the furnace.

[0114] 3. Detailed explanation of key technical principles and structures

[0115] (1) Vector nozzle

[0116] Structure Figure 3a , Figure 3b , Figure 3c , Figure 3d shown.

[0117] 1) Detailed explanation of the functions of each component:

[0118] The movable connecting rod A14, the servo drive device, acts on the right end of the connecting rod to push the connecting rod forward or backward. The fixed connecting rod 15 is fixed relative to the servo drive device, so the nozzle will rotate but will not be displaced, thereby achieving the angle adjustment in the X direction;

[0119] Fixed link 15, this link can be called a fixed link in the vector nozzle mechanism. In fact, this link is fixed in the X direction, but in the Y direction, it will rotate around the fixed axis 18 with the movable L-shaped link 17. The servo drive device base is installed on this fixed link 15. The driving part of the servo drive device is connected to the link 14 and installed between the link 15 and the link 14. It will generate thrust in the X direction, and the link 14 will be displaced relative to the link 15 in the X direction. When the vector nozzle is adjusted in the Y direction, the servo drive device will rotate synchronously around the fixed axis 18 with the links 14 and 15. The fixed link 15 is only connected to the L-shaped link 17 and the servo drive device.

[0120] The movable link B16, when the servo drive device drives the movable link A14, will drive the movable L-shaped link to swing left and right;

[0121] The movable L-shaped connecting rod 17 can drive the entire mechanism to rotate around the fixed axis 18 under the action of the servo drive device to achieve angle adjustment in the Y direction. The drive device acts on the top of the movable L-shaped connecting rod;

[0122] The fixed shaft 18 is fixed and the whole mechanism can rotate around it to achieve the angle adjustment in the Y direction;

[0123] Nozzle front end 19 (rigid), made of metal;

[0124] The rear end 20 (flexible) of the nozzle is made of a high temperature resistant flexible tube (high temperature resistant 600-800°C), which is connected to the hot air source. The hot air passes through the high temperature flexible tube, through the nozzle-front end, and is blown out through the nozzle outlet;

[0125] An air outlet 21, from which hot air is blown out;

[0126] There are 9 hinge shafts in total, which are connected with relatively rotating parts. The upper and lower surfaces of each nozzle and the front and rear ends of the movable connecting rod B16 are all connected by hinge shafts.

[0127] 2) Advantages analysis:

[0128] ① High flexibility, this linkage mechanism can connect multiple nozzles to adjust the angle. It can also connect a nozzle alone to control the angle of a nozzle.

[0129] ② High synchronization: multiple nozzles are driven by the same set of linkage mechanisms, with high synchronization.

[0130] ③ The angle adjustment in both X-axis and Y-axis directions can be realized. For sand cores of different heights, the angle of the nozzle in the Y direction can be adjusted so that the nozzle blows directly to the upper surface of the sand core, especially when the upper surface is concave, the advantage is more obvious. For sand cores of different thicknesses, the angle in the X direction can be adjusted so that the air outlet blows directly to the front and back surfaces of the sand core, especially when the surface is concave, the advantage is particularly obvious.

[0131] ④ Due to the large variety of products, in order to avoid frequent adjustment of the vector nozzle inclination angle, it is not recommended to adjust the vector nozzle inclination angle for sand core products with a height difference of less than 30% and a thickness difference of less than 50%, because any inclination angle value of the vector nozzle has a certain size adaptation range for different sand core products. If it exceeds the size adaptation range, adjust the vector nozzle inclination angle.

[0132] (2) Hot air system layout

[0133] Hot air system layout Figure 1 shown.

[0134] 1) Detailed layout explanation, which is also a design method of a sand core drying furnace system described in the present invention, is specifically embodied as follows:

[0135] A drying furnace preheating section 3, a drying furnace heating section 4, and a drying furnace cooling section 5 are provided;

[0136] The common nozzle 6 and the bottom common nozzle 8 are installed on the side wall and the bottom respectively, which are direct spraying and the angle is not adjustable. The vector nozzle 7 is adjustable in the X and Y directions. Each group of vector nozzles is arranged relative to each other at an angle of ±15° in the horizontal direction. The air outlet is more inclined to face the surface of the sand core, and the surfaces on both sides of the sand core can be directly blown by the hot air.

[0137] The exhaust air of the drying section is divided into two pipes. One pipe acts on the preheating section and uses the waste heat for preheating. The other pipe is connected to the office heating or employee bathroom hot water heating, which improves the utilization rate of energy (heat). When there is excess heat in the drying furnace, the office heating or bathroom will be turned on to ensure production.

[0138] 2) Advantages analysis:

[0139] The common nozzles commonly used in the industry (direct spray type, and the angle is not adjustable) do not distinguish between sand core products, and all use the same angle for blowing. For small-sized sand core products, a large amount of hot air cannot blow directly on the surface of the sand core. For thick sand cores with concave front and back surfaces, the hot air cannot blow into the concave interior. The drying speed inside the concave is lower than that of the outer surface of the sand core, so it will cause inconsistent drying speeds in various parts of the sand core, and even microcracks at the junction of the first drying and the last drying due to stress. The hot air of the present invention acts more directly on the surface of the sand core, especially for sand cores with concave surfaces. The advantages of this nozzle inclination angle layout are more obvious, and the hot air can be blown more directly into the concave interior. The drying efficiency is improved, and the consistency of the drying quality and the consistency of the drying speed of different parts of the sand core are guaranteed.

[0140] (3) Hollow slag tray

[0141] Pallet structure Figure 4a , Figure 4b , Figure 4c , Figure 4d shown.

[0142] 1) Detailed structure:

[0143] The slag discharge air inlet 22 has the functions of both slag discharge and hot air intake at the bottom. When the sand core falls on the air outlet, the hot air at the bottom can be blown to the bottom of the sand core for drying. The residual sand and other debris dropped from the sand core can fall into the slag collecting groove 26 through this opening. The slag collecting grooves can be arranged more densely and the groove spacing can be smaller, so as to facilitate the blowing of a large amount of hot air to dry the bottom of the sand core and facilitate slag discharge.

[0144] The hot air blown out from the bottom nozzle can pass through the bottom air inlet 23 and then through the side wall air inlet 27 to be blown to the bottom surface of the sand core.

[0145] The dumping auxiliary window 24, when the residual sand and debris in the slag collecting tank accumulate to a certain extent, it is necessary to remove the tray and dump the accumulated residual sand and debris inside. The function of the dumping auxiliary window 24 is to facilitate the removal of the tray and the flipping and dumping operation. It can be called the clamping window of the clamp or the positioning hole for clamping and flipping.

[0146] The support plate 25 serves to support the entire tray;

[0147] The slag collecting trough 26 is used to collect the residual sand and debris dropped from the sand core. The bottom of the slag collecting trough is a 10° slope, and the opening end is a high point to prevent the residual sand and debris from flowing out of the slag collecting trough during the operation of the tray. ;

[0148] The hot air is blown out through the bottom nozzle through the side wall air inlet 27, through the bottom air inlet 23, and then through the side wall air inlet 27 to the bottom of the sand core.

[0149] 2) Advantages analysis:

[0150] For ordinary trays, if the bottom is closed, the function of heating the bottom of the sand core cannot be achieved. If the bottom is hollowed out, the residual sand and debris will enter the nozzle through the hollow hole and block the nozzle, and will also fall to the bottom of the furnace roller and cannot be cleaned. The tray used in the present invention takes into account the functions of blowing and slag removal, while avoiding the contradiction between the two.

[0151] (4) 3D Vision System

[0152] 1) 3D vision system: It can take photos of the sand cores that are about to enter the furnace before entering the furnace, obtain the three data of the sand cores' height, thickness, and distance between the sand cores, and transmit the data to the processor;

[0153] 2) The processor receives the sand core related data sent back by the 3D vision system, sets the appropriate nozzle angle according to the data, and then sends instructions to the control element of the nozzle to adjust the nozzle angle.

[0154] 3) The processor can also adjust the air volume in the upper, middle and lower areas according to the size (height) of the sand core and the thickness difference between the upper and lower parts of the product.

[0155] 4) Advantage analysis: The control system adjusts the nozzle angle and controls the air volume in different areas according to the size of the sand core to maximize the utilization of energy. The system has good human-computer interaction function.

[0156] The beneficial technical effects of this application are as follows:

[0157] 1. Vector nozzle technology: Most of the nozzles currently used in the industry are straight nozzles, and they are all fixed and the angle cannot be adjusted. The vector nozzle of this application has 2 degrees of freedom and can be adjusted in the X / Y direction. The appropriate angle can be adjusted according to the product size and product structure, so that the hot air from the nozzle can be blown and dried more accurately at the product, which is better than the traditional fixed nozzle. The application of vector nozzles improves energy utilization and shortens drying time, thereby achieving energy saving and efficient production;

[0158] 2. Layout of hot air system: The drying system is divided into three areas: preheating area, heating area, and cooling area. The preheating area uses ordinary straight nozzles to preheat the sand core. In the heating area, there are several groups of vector nozzles, each group of vector nozzles is arranged relative to each other at a 15° inclination (adjustable), which can blow directly to the front and back sides of the sand core without dead angles, especially for sand cores with concave surfaces, its advantages are significantly better than traditional nozzles. The vector nozzle can adjust the angle according to the size of the product, so that the air outlet blows directly to the sand core.

[0159] 3. Control system: The top, middle and bottom are divided into three zones, and the air volume (heat) is adjustable. If the top is thin-walled (the surface area and volume are relatively large, which is conducive to moisture drying) and the bottom is thick-walled, the air volume of the upper nozzle will be reduced and that of the lower part will be increased. This ensures the consistency of the drying quality and drying speed of the product at different positions. This patent shows three rows of nozzles, each row represents an area, representing the three zones of top, middle and bottom. The number of nozzles in each row is only for display and does not represent the actual number of nozzles. For example, there may be three rows of nozzles in the upper zone, four rows of nozzles in the middle zone, and five rows of nozzles in the lower zone.

[0160] 4. Energy saving: The exhaust air in the heating area is divided into two routes. The exhaust air in one route enters the preheating area after drying, and the waste heat in the heating area is used to heat the preheating area. The other route is connected to the heating of the factory building (mainly offices) to utilize the waste heat. The heating pipeline is only turned on when there is excess heat in the preheating area. This pipeline design maximizes the utilization rate of energy.

[0161] 5. Flexible production: A 3D camera recognition system is installed above the entrance of the drying furnace, which can identify different products. After the control unit receives the product information, it will adjust the angle of the vector nozzle in the heating zone accordingly if necessary to adapt to products of different sizes, so as to ensure that the energy utilization rate can still be maximized when drying products of different sizes. For example, for products with a height that is too small, the vertical angle of the nozzle in the upper zone can be adjusted to a larger angle so that the nozzle can blow directly onto the sand core. For sand cores with deeper concave shapes, the horizontal angle of the vector nozzle can be adjusted to a larger angle so that the hot air from the nozzle can blow as far as possible into the concave shape, thereby speeding up the drying speed and improving the drying quality.

[0162] 6. Hollow slag tray: The main body of the drying system of the present application has an air outlet nozzle at the bottom, which can dry the bottom of the sand core. For traditional drying furnaces, if the tray is hollowed out in a general way, the fallen residual sand will enter the nozzle and block the nozzle. If a tray with a closed bottom is used, the hot air emitted from the bottom cannot dry the bottom of the sand core. Therefore, traditional drying furnaces basically do not have nozzles at the bottom, and the heating of the bottom of the sand core is also a shortcoming. The hollow slag tray used in the present application allows for a nozzle to be added to the bottom, which effectively solves the contradiction between slag removal and heating of the bottom of the sand core, and can take into account both slag removal and heating and drying of the bottom of the sand core.

[0163] The vector nozzle control mechanism of the present invention can have a variety of deformation derivative mechanisms, which can realize the control of a single nozzle, can also control multiple nozzles in one-dimensional direction, and can also realize the control of multiple nozzles in two-dimensional direction;

[0164] The present invention adopts 3D intelligent recognition and cooperates with other technologies to achieve significant intelligentization.

[0165] The layout of the hot air system of the present invention: the nozzles are arranged at relative inclination angles, waste heat is utilized, and energy is saved;

[0166] The intelligent control of the present invention: combined with 3D intelligent recognition technology, the nozzle angle and air output are intelligently controlled according to the sand core size.

[0167] The hollow slag discharge tray is adopted, which takes into account the two functions of bottom air outlet heating and tray slag discharge.

[0168] The above is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any modification, equivalent replacement and improvement made by any person skilled in the art within the technical scope disclosed by the present invention and within the spirit and principle of the present invention shall be covered within the protection scope of the present invention. At the same time, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

Claims

1. A sand core drying furnace system, characterized in that: Including hot air system, control system, exhaust system, tray; The hot air system includes a nozzle and a drying furnace; The nozzle comprises a vector nozzle (7); The drying furnace is divided into a drying furnace preheating section (3), a drying furnace heating section (4), and a drying furnace cooling section (5); The vector nozzles (7) are installed on both sides of the heating section (4) of the drying furnace; The control system includes a 3D intelligent recognition system camera, a PLC, and a processor; The 3D intelligent recognition system camera collects product information, the PLC receives the product information, the processor processes the product information, and adjusts the angle of the vector nozzle (7) accordingly; The exhaust system is arranged above the heating section of the drying furnace; A transport roller is provided in the drying furnace, and the tray runs on the roller, enters from the inlet end, and comes out from the outlet end; The vector nozzle comprises a movable connecting rod A (14), a fixed connecting rod (15), a movable connecting rod B (16), a movable L-shaped connecting rod (17), a fixed shaft (18), a front nozzle (19), a rear nozzle (20), and a hinge shaft; The servo drive device acts on the right end of the movable link A (14), pushing the movable link B (16) forward or backward, driving the movable L-shaped link (17) to swing left and right; the movable L-shaped link (17) rotates around the fixed axis (18); the fixed link (15) is fixed; The rear end (20) of the nozzle is connected to a hot air source, and the hot air passes through the high-temperature flexible pipe, through the front end of the nozzle, and is blown out through the nozzle outlet; An air outlet (21), from which hot air is blown out; The hinge shaft is connected with relatively rotating parts, and the upper and lower surfaces of each nozzle and the front and rear ends of the movable connecting rod B (16) are all connected by the hinge shaft; The tray is a hollow slag discharge tray; it comprises a slag discharge air inlet (22), a bottom air inlet (23), a dumping auxiliary window (24), a slag collecting trough (26), and a side wall air inlet (27); The slag discharge air inlet (22) is used for slag discharge and hot air intake at the bottom. When the sand core falls on the air outlet, the hot air at the bottom can be blown to the bottom surface of the sand core for drying. The residual sand and debris dropped from the sand core fall into the slag collecting tank (26) through this outlet. The hot air blown out from the bottom nozzle can pass through the bottom air inlet (23) and then through the side wall air inlet (27) to be blown to the bottom surface of the sand core; The function of the dumping auxiliary window (24) is to facilitate the removal of the tray and the flipping and dumping operation; The slag collecting trough (26) is used to collect the residual sand and debris dropped from the sand core. The bottom of the slag collecting trough is a slope and the opening end is a high point to prevent the residual sand and debris from flowing out of the slag collecting trough during the operation of the tray. The hot air is blown out through the bottom nozzle, through the bottom air inlet (23), and then through the side wall air inlet (27), and blown to the bottom of the sand core.

2. A sand core drying furnace system according to claim 1, characterized in that: The nozzle also includes a common nozzle (6) and a common nozzle (8) at the bottom; The common nozzle (6) is installed on the side wall of the preheating section of the drying furnace, and the common nozzle (8) at the bottom is installed at the bottom of the drying furnace.

3. A sand core drying furnace system according to claim 1, characterized in that: The 3D intelligent recognition system camera is arranged at the front end of the drying furnace.

4. A sand core drying furnace system according to claim 1, characterized in that: The exhaust system comprises a fan (9), an air outlet pipe (10) connected to the preheating section, and an air outlet pipe (11) connected to the heating section; The fan (9) is arranged above the heating section of the drying furnace; The air outlet pipe (10) connected to the preheating section is connected to the preheating section (3) of the drying furnace, and the air outlet pipe (11) connected to the heating is connected to the office heating.

5. The sand core drying furnace system according to claim 1, characterized in that: The core of the control system is the PLC in the control cabinet, and the control cabinet and the drying oven are connected by cables.

6. A sand core drying furnace system according to claim 1, characterized in that: The bottom of the slag trough has a slope of 10°.

7. The sand core drying furnace system according to claim 1, characterized in that: The hollow slag discharge tray further comprises a support plate (25), and the support plate (25) serves to support the entire tray.

8. A method for designing a sand core drying furnace system according to any one of claims 1 to 7, characterized in that: The drying furnace is divided into a drying furnace preheating section (3), a drying furnace heating section (4), and a drying furnace cooling section (5); The common nozzle (6) and the bottom common nozzle (8) are respectively installed on the side wall and the bottom of the drying furnace, and are direct spraying type, and the angle is not adjustable; The vector nozzles (7) are installed on both sides of the heating section (4) of the drying furnace, and the angles in the X and Y directions are adjustable; each group of vector nozzles is arranged relative to each other at an inclination angle of ±15° in the horizontal direction, and the air outlets tend to face the surface of the sand core, so that the surfaces on both sides of the sand core can be directly blown by the hot air; Set up a control system, which includes a 3D intelligent recognition system camera, a PLC, and a processor; The camera of the 3D intelligent recognition system collects product information, the PLC receives the product information, the processor processes the product information, and adjusts the angle of the vector nozzle (7) accordingly.

9. The design method of a sand core drying furnace system according to claim 8, characterized in that: The drying furnace heating section is equipped with two exhaust pipes, one of which acts on the preheating section and uses waste heat for preheating, and the other is connected to the office heating system; A transport roller is provided in the drying furnace, and the hollow slag discharge tray runs on the roller, enters from the inlet end and comes out from the outlet end.

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