Heating device for multiple large iron molds and models with different cavities

Abstract

The utility model relates to a heating device for a plurality of large iron molds and models with different cavities, and belongs to the field of machinery. The device comprises a movable trolley, a movable trolley track, a grabbing type manipulator mechanism and a fixed trolley heating furnace, the movable trolley is arranged on the movable trolley track, and the grabbing type manipulator mechanism grabs and moves an iron mold and a model from the movable trolley to a heating trolley of the fixed trolley heating furnace; the grabbing type manipulator mechanism comprises a moving trolley, a moving track frame, a moving trolley track, a lifting movable beam, a hydraulic cylinder, a mechanical gripper, a guide rod and a stand column, the moving trolley is arranged on the moving trolley track, and the moving track frame is arranged on the stand column; the moving trolley is provided with a hydraulic cylinder which ascends and descends synchronously, the hydraulic cylinder is connected with a lifting movable beam, the lifting movable beam is provided with four guide rods, and two mechanical grippers are installed on the bottom face of the lifting movable beam. The device is reliable in operation, convenient to install, low in maintenance cost, high in automation degree and smooth in technological process, and meets the use requirements.

Description

TECHNICAL FIELD

[0001] The utility model relates to a heating device, especially to a heating device for multiple different cavity large iron moulds and models, and belongs to the mechanical field. BACKGROUND

[0002] Iron mould sand coated casting belongs to the special casting category, and its casting production has the advantages of green, high quality, energy saving, environmental protection, low cost and the like, and is mainly applied to the casting production of large quantities of small and medium castings, such as large quantities of automobile castings.

[0003] In recent years, with the rapid development of the equipment manufacturing industry, some large equipment has put forward higher requirements on the quality of castings, and the production rate of such castings (such as main shaft castings and planet carrier castings in wind power castings) is not high, and the castings are large (the weight of the castings is more than 10 tons, and the maximum size is 3-6 meters), and the casting mould used for casting production is often composed of multiple moulds, each iron mould and model is large in size and heavy in weight, and the weight is often 10-30 tons, and the weight of some is even 40-50 tons. For the sand layer forming of the inner cavity of the large iron mould sand coated casting mould, the hot curing coated sand is still used due to the thin thickness (generally 10-20 mm) of the sand layer. The iron mould and the model need to be heated to about 150-200 DEG C. For such large size and weight of the iron mould and the model, the built-in electric heating pipe heating mode of the iron mould and the model in the ordinary iron mould sand coated casting production is not suitable.

[0004] Therefore, developing a heating device suitable for multiple different cavity iron moulds and models has become one of the keys to realize the sand coated moulding of large iron moulds. CONTENT OF THE UTILITY MODEL

[0005] The utility model aims at overcoming the above-mentioned deficiencies in the prior art, and provides a heating device for multiple different cavity large iron moulds and models, which has the advantages of reasonable structure design, reliable operation, convenient installation, low maintenance cost, high automation degree and smooth process flow.

[0006] The technical solution adopted by this utility model to solve the above problems is as follows: An external heating furnace is used to heat the molded iron mold and model after molding by means of thermal radiation and thermal convection. Specifically, this heating device for large iron molds and models with multiple different cavities includes a moving trolley carrying the molded iron mold and model after molding and a moving trolley track. The moving trolley is set on the moving trolley track. The device is characterized by further including a gripping robotic arm mechanism and a fixed trolley heating furnace equipped with a heating trolley. The gripping robotic arm mechanism grips the iron mold and model from the moving trolley and moves them to the fixed trolley for heating. The furnace heating trolley features a gripping robotic arm mechanism comprising a moving trolley, a moving track frame, a moving trolley track, a lifting beam, two hydraulic cylinders, two mechanical grippers, four guide rods, and several columns. The moving trolley can move back and forth on the moving trolley track on the moving track frame, which is fixed to several columns. Two synchronously lifting hydraulic cylinders are installed on the moving trolley, with the piston rod heads of the hydraulic cylinders connected to the lifting beam, which rises and falls with the hydraulic cylinders. Four guide rods are installed on the upper part of the lifting beam, and two mechanical grippers are fixedly installed on the bottom surface of the lifting beam.

[0007] Preferably, the mobile trolley of this utility model includes a trolley body, a positioning and running mechanism, an upper hook, wheels and guide wheels. The positioning and running mechanism is provided on the trolley body and is installed on the worktable of the mobile trolley. Multiple wheels and guide wheels are provided on the lower part of the trolley body, and an upper hook is also provided on the lower part of the trolley body.

[0008] Preferably, the wheels of the mobile trolley described in this invention are self-powered wheel systems.

[0009] Preferably, the fixed trolley heating furnace of this utility model further includes a trolley moving track, a heating furnace body, and a lifting furnace door. The heating trolley is set on the trolley moving track, and the heating furnace body is set on one side of the heating trolley. The upper part of the heating furnace body is set with a lifting furnace door.

[0010] Preferably, the positioning and operating mechanism of this utility model includes four positioning pins arranged in a cross shape.

[0011] Compared with the prior art, this utility model has the following advantages and effects: (1) The overall structure is reasonably designed and safe and reliable. Through this utility model device, the heating operation of multiple large iron molds with different cavities and corresponding models can be completed; (2) This device performs heating operations of multiple sets of large iron molds and models. The process flow is smooth and the heating operation of iron molds and models can be fully mechanized and automated. It is easy to realize the heating operation of multiple different iron molds and models. The heating range of iron molds and models can be freely adjusted according to the needs. After heating, the temperature of iron molds and models is uniform and consistent, which is conducive to improving the sand shooting and sand coating quality of iron molds. (3) Multiple mobile trolleys are used to load different iron molds and models, which are then sequentially fed into the heating device of this utility model. This allows for the heating of multiple sets of iron molds and models with different cavities. The number of iron molds and models is unlimited. (4) This external heating device for multiple large iron molds / models has low investment costs, is easy to install, reliable in operation, and has low maintenance costs. (5) When integrated with the iron mold sand casting device and other supporting devices, it can form a large iron mold sand casting molding line, realize the mechanized production of sand casting of multiple large iron molds with different cavities, and thus realize the mass production of large castings made by iron mold sand casting. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of a heating device for a large iron mold with multiple cavities of different shapes in an embodiment of this utility model.

[0013] Figure 2 This is a schematic diagram of the main structure of the fixed trolley heating furnace in the large iron mold and model heating device of this utility model embodiment.

[0014] Figure 3 This is a top view of the fixed trolley heating furnace in the large iron mold and model heating device of this utility model embodiment.

[0015] Figure 4 This is a front view structural schematic diagram of the gripping manipulator mechanism in the large iron mold and model heating device of this utility model embodiment.

[0016] Figure 5 This is a top view schematic diagram of the gripping manipulator mechanism in the large iron mold and model heating device of this utility model embodiment.

[0017] Figure 6 This is a side view of the gripping robotic arm mechanism in the heating device for large iron molds and models according to an embodiment of this utility model.

[0018] Figure 7 This is a three-dimensional structural diagram of the gripping robotic arm mechanism in the large iron mold and model heating device of this utility model embodiment.

[0019] Figure 8This is a front view structural schematic diagram of the moving trolley in the large iron mold and model heating device of this utility model embodiment.

[0020] Figure 9 This is a side view of the moving trolley in the heating device for large iron molds and models according to an embodiment of this utility model.

[0021] Figure 10 This is a top view of the moving trolley in the heating device for large iron molds and models according to an embodiment of this utility model.

[0022] Figure 11 This is a three-dimensional structural diagram of the moving trolley in the large iron mold and model heating device of this utility model embodiment.

[0023] Figure 12 This is a schematic diagram of the structure of the iron mold and model used in the heating device for multiple large iron molds and models with different cavities according to an embodiment of the present invention.

[0024] Figure 13 This is a schematic diagram of the initial state of multiple large iron molds and models during the heating process of this utility model embodiment.

[0025] Figure 14 This is a schematic diagram of the first trolley carrying the assembled iron mold and model entering the iron mold and model grasping station during the heating process of multiple large iron molds and models in this embodiment of the utility model.

[0026] Figure 15 yes Figure 14 A schematic diagram of the structure along direction A.

[0027] Figure 16 This is a schematic diagram of a gripping robotic arm mechanism that lifts the iron molds and models away from the supporting trolley during the heating process of multiple large iron molds and models according to an embodiment of this utility model.

[0028] Figure 17 This is a schematic diagram of how the grabbing and moving device moves the iron molds and models to the top of the heating furnace heating trolley during the heating process of multiple large iron molds and models according to an embodiment of this utility model.

[0029] Figure 18 This is a schematic diagram of how the grabbing and moving device places the iron molds and models onto the heating furnace heating trolley during the heating process of multiple large iron molds and models according to an embodiment of this utility model.

[0030] Figure 19 This is a schematic diagram illustrating the heating process of multiple large iron molds and models in an embodiment of this utility model. The heating trolley enters the heating furnace, the furnace door descends and closes, and the heating of the iron molds and models begins.

[0031] Figure 20This is a schematic diagram illustrating how the gripping device, during the heating process of multiple large iron molds and models, grips the heated iron molds and models and places them above a supporting mobile trolley.

[0032] Figure 21 This is a schematic diagram of how the gripping device places the heated iron molds and models onto a carrier-mounted mobile trolley during the heating process of multiple large iron molds and models according to an embodiment of this utility model.

[0033] Figure 22 This is a schematic diagram of the heating process of multiple large iron molds and models in an embodiment of this utility model, showing the trolley carrying the heated iron molds and models moving out of the iron mold / model grasping station.

[0034] Figure 23 This is a schematic diagram of a large spindle casting. Figure 1 .

[0035] Figure 24 This is a schematic diagram of a large spindle casting. Figure 2 .

[0036] Figure 25 This is a schematic diagram of the casting of a large wind turbine main shaft iron mold after assembly.

[0037] In the diagram: Iron mold T, Model M, Fixed trolley heating furnace 1, Grasping robot mechanism 2, Mobile trolley 3, Mobile trolley track 4, Model base 5, Base clamping plate 6, Grasping plate 7, Track beam 8.

[0038] Fixed trolley heating furnace 1: heating trolley 11, trolley moving track 12, heating furnace body 13, lifting furnace door 14;

[0039] Grasping robot mechanism 2: mobile trolley 21, mobile track frame 22, mobile trolley track 23, column 24, lifting beam 25, hydraulic cylinder 26, guide rod 27, mechanical gripper 28, pull hook 29, crossbeam 30;

[0040] Mobile trolley 3: trolley body 31, positioning and running mechanism 32, positioning pin 321, upper hook 33, wheel 34, guide wheel 35. Detailed Implementation

[0041] The present invention will be further described in detail below with reference to the accompanying drawings and through embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0042] Example

[0043] See Figures 1 to 25The heating device for multiple large iron molds and models with different cavities in this embodiment includes a fixed trolley heating furnace 1, a gripping robot mechanism 2, a mobile trolley 3, a mobile trolley track 4, a heating iron mold T and model receiving station, and a station for the iron mold T and model gripping robot mechanism 2, etc. The mobile trolley 3 is set on the mobile trolley track 4, and the mobile trolley track 4 and the track beam 8 together form the structural frame of the track system.

[0044] In this embodiment, the heating operation of the iron mold T and the model is completed in a fixed trolley heating furnace; the movement and transportation of multiple iron mold Ts and models is carried out by a mobile trolley 3, with a set of molded iron mold Ts and models placed on each mobile trolley 3; a gripping robot arm mechanism 2 is used to grab the iron mold Ts and models from the mobile trolley 3 and move them to the heating trolley 11 of the fixed trolley heating furnace 1.

[0045] like Figure 1 As shown, when the moving trolley track 4 carrying the iron mold T and the model is arranged in parallel with the moving trolley track 12 of the fixed trolley heating furnace 1 for the iron mold T and the model, the gripping walking direction and the moving track frame 22 in the gripping manipulator 2 intersect the above two perpendicularly; when a different arrangement is adopted, the gripping mechanism walking direction and the walking track frame in the gripping mechanical device can also adopt other arrangements.

[0046] like Figures 4-7 As shown, in this embodiment, the gripping manipulator mechanism 2 includes a mobile trolley 21, a mobile track frame 22, a mobile trolley track 23, a lifting beam 25, two hydraulic cylinders 26, two mechanical grippers 28, four guide rods 27, and several columns 24.

[0047] In this embodiment, the mobile trolley 21 is a steel welded frame structure that can move back and forth on the mobile track frame 22. Two synchronously lifting hydraulic cylinders 26 are fixedly installed on the mobile trolley 21. The piston rod head of the hydraulic cylinder 26 is fixedly connected to the lifting beam 25. The lifting beam 25 can rise and fall with the hydraulic cylinder 26, and is used to grab or put down the molded iron mold T and model after mold closing.

[0048] In this embodiment, the movable track frame 22 is a welded steel structure. The movable track frame 22 is fixedly installed on several columns 24 to form an integral component, which is used to bear the weight of all mechanical mechanisms above it in the mechanical gripping device, as well as the iron mold T and model, etc.

[0049] In this embodiment, the mobile trolley track 23 and the crossbeam 30 are connected to form a mobile track frame 22, ensuring the safety and reliability of the track system.

[0050] In this embodiment, the lifting beam 25 is a welded steel structure, and the lifting beam 25 is fixedly connected to the piston rod head of the hydraulic cylinder 26.

[0051] In this embodiment, four guide rods 27 are also fixedly installed on the upper part of the lifting beam 25, which play a role in smooth guidance when the lifting beam 25 moves up and down.

[0052] In this embodiment, two mechanical grippers 28 are fixedly installed on the bottom surface of the lifting beam 25, and are used to grab or put down the iron mold T and model after the mold is closed.

[0053] See Figures 2-3 In this embodiment, the fixed trolley heating furnace 1 includes a heating trolley 11, a trolley moving track 12, a heating furnace body 13, and a lifting furnace door 14. The heating trolley 11 is set on the trolley moving track 12, and the heating furnace body 13 is set on one side of the heating trolley 11. The lifting furnace door 14 is set on the upper part of the heating furnace body 13.

[0054] The heating working principle and process of the fixed trolley heating furnace 1 in this embodiment are as follows: the iron mold T and model to be heated are placed on the heating trolley 11, and then the heating trolley 11 drives into the heating furnace and lowers the lifting furnace door 13 to the position, that is, the furnace door is closed, so that the iron mold T and model to be heated are in the closed heating furnace space; the power is turned on, and the electric heating element immediately starts to heat up. The heat generated can raise the temperature inside the furnace to the temperature range required by the iron mold T and model. The heat generated inside the furnace heats up the iron mold T and model inside the heating furnace through radiation, convection and other means until the temperature of the iron mold T and model body reaches the required temperature range.

[0055] like Figures 8-11 As shown, in this embodiment, the mobile trolley 3 includes a trolley body 31, a positioning and running mechanism 32, an upper hook 33, wheels 34 and guide wheels 35. The positioning and running mechanism 32 is provided on the trolley body 31 and is installed on the worktable of the mobile trolley 3. Multiple wheels 34 and guide wheels 35 are provided on the lower part of the trolley body 31.

[0056] In this embodiment, the positioning and running mechanism 32 consists of four large positioning pins arranged in a cross shape on the worktable of the trolley body 31. When the iron mold T and the model are placed on the worktable of the mobile trolley 3, the positioning and running mechanism 32 positions the iron mold T and the model between the mobile trolley 3 and the mobile trolley 3. At the same time, when the mobile trolley 3 moves automatically, it drives the iron mold T and the model to move and run together with the mobile trolley 3.

[0057] In this embodiment, an upper hook 33 is also provided below the body 31 of the mobile trolley 3, which is used in conjunction with the lower hook 29 of the work station of the iron mold T and model grasping robot arm mechanism 2. When the mechanical gripper 28 in the mobile grasping robot arm mechanism 2 grasps the iron mold T and model from the mobile trolley 3, the mobile trolley 3 is fixed on the mobile trolley track 4.

[0058] In this embodiment, the wheels 34 of the mobile trolley 3 adopt a self-powered wheel system.

[0059] To meet the production and operation requirements of the heating device in this embodiment, the iron mold T and model used in production are shown in the structural diagram, as follows. Figure 12 As shown, the model base 5 is provided with cross-shaped elongated positioning pin holes corresponding to the cross-shaped positioning pins 321 on the mobile trolley 3; at the same time, the model base 5 is also provided with the gripping structure required for the mechanical gripper 28 in the gripping manipulator mechanism 2.

[0060] In this embodiment, an iron mold T, a model gripping plate 7, and a base clamping plate 6 are respectively provided above and below the model base 5.

[0061] In this embodiment, multiple mobile trolleys 3 are used to load iron molds T and models after different molding processes. The mechanical gripper 28 in the gripping robot mechanism 2 grabs the iron molds T and models to the fixed trolley heating furnace 1. In the furnace, the iron molds T and models are heated to the temperature required for sand spraying and sand coating molding through heat exchange methods such as radiation and convection. Then, the iron molds T and models are grabbed from the fixed trolley heating furnace 1 and placed on the mobile trolley 3 to complete the heating operation of the iron molds T and models that need to be sand coated.

[0062] like Figures 13-22As shown, the heating process of the heating device for multiple large iron molds T and models with different cavities in this embodiment is as follows: The fixed trolley heating furnace 1 is powered on and heated to the required temperature of the iron mold T and model. Multiple mobile trolleys 3 carrying the iron mold T and model are arranged sequentially on the mobile trolley track 4. The hydraulic cylinder 26 in the gripping manipulator mechanism 2 drives the mechanical gripper 28 to descend to the lowest position. The first mobile trolley 3 carrying the iron mold T and model automatically enters the gripping manipulator mechanism 2 and stops. The iron mold T and model heating trolley 11 automatically drives out of the heating furnace body 13 and stops at the iron mold T and model receiving position. The hydraulic cylinder 26 in the gripping manipulator mechanism 2 rises, driving the mechanical gripper 28 to rise. When the upper plane of the mechanical gripper 28 is aligned with the model... After the lower plane of the gripping structure of the base 5 contacts, the mechanical gripper 28 continues to rise, which drives the iron mold T and the model to rise together. The anti-rising mechanism at the bottom of the moving trolley 3 (the working surface of the upper hook 33 of the moving trolley 3 and the working surface of the lower hook 29 are completely in contact) restricts the moving trolley 3 to remain stationary on the moving trolley track 4. The iron mold T and the model gradually rise away from the plane of the moving trolley 3. When the hydraulic cylinder 26 in the gripping manipulator mechanism 2 of the iron mold T and the model rises to the highest point, the lower plane of the model base 5 will be 100 mm higher than the positioning pin 321 of the moving trolley 3. At this time, the lower plane of the model base 5 is more than 100 mm higher than the upper plane of the heating trolley 11 of the fixed trolley heating furnace 1. Then the moving trolley in the gripping manipulator mechanism 2... The trolley 21 begins to move within the moving track frame 22, carrying the iron mold T and model away from the gripping manipulator mechanism 2 and onto the heating trolley 11 of the fixed trolley heating furnace 1, where they are received and then stop. The hydraulic cylinder 26 in the gripping manipulator mechanism 2 slowly descends, causing the mechanical gripper 28 to also slowly descend, lowering the iron mold T and model. Once the lower plane of the model's base reaches the upper plane of the heating trolley 11, the iron mold T and model are completely placed on the heating trolley 11. The mechanical gripper 28 continues to descend, and once the upper plane of the mechanical gripper 28 is completely separated from the lower plane of the gripping structure of the model base 5 by 50 mm, the hydraulic cylinder 26 stops descending. The heating trolley 11, carrying the iron mold T and model, moves towards the heating furnace. The body 13 moves completely into the heating furnace body 13 and stops. The lifting furnace door 14 descends to close the heating furnace body 13. The iron mold T and the model are heated in the fixed trolley heating furnace 1. When the iron mold T and the model reach the sand covering molding temperature range, the lifting furnace door 14 is opened. The heating trolley 11 moves out of the heating furnace body 13 and stops at the position where the heating trolley 11 receives the iron mold T and the model. The hydraulic cylinder 26 in the iron mold T and model gripping manipulator mechanism 2 rises, driving the mechanical gripper 28 to rise. After the upper plane of the mechanical gripper 28 contacts the lower plane of the gripping structure of the model base 5, the mechanical gripper 28 continues to rise to the highest point, driving the iron mold T and the model to rise together. The iron mold T and the model are completely separated from the plane of the heating trolley 11.Then, the moving trolley 21 in the iron mold T and model grasping robot mechanism 2 begins to move within the moving track frame 22, moving from the heating trolley 11 in the fixed trolley heating furnace 1, which carries the iron mold T and model, to the station of the iron mold T and model grasping robot mechanism 2, which carries the moving trolley 3, and stops there. The hydraulic cylinder 26 and mechanical gripper 28 in the iron mold T and model grasping robot mechanism 2 begin to descend, driving the iron mold T and model down. The positioning pin 321 on the plane of the moving trolley 3 re-inserts into the phase on the model base 5. In the corresponding elongated positioning hole, after the lower plane of the model base 5 contacts the plane of the moving trolley 3, the iron mold T and the model completely fall onto the moving trolley 3; the hydraulic cylinder 26 and the mechanical gripper 28 continue to descend, and the upper plane of the mechanical gripper 28 completely separates from the lower plane of the gripping structure of the model base 5; the moving trolley 3, carrying the heated iron mold T and model, automatically and completely moves away from the workstation of the iron mold T and model gripping robotic arm mechanism 2, completing the heating operation of this iron mold T and model; this cycle is repeated to complete the heating operation of multiple iron mold Ts and models.

[0063] Large castings are produced using iron molds with sand coating. Due to factors such as the casting structure, size, mold-making requirements, and other casting process requirements, more than two large iron molds are often needed to be combined to form the required iron mold with sand coating for large castings, such as wind turbine main shaft castings (e.g., Figures 23-24 As shown), the iron mold with sand covering that forms its outer contour uses multiple iron molds of different shapes and sizes (generally 4 along the length of the main wind turbine shaft axis (each iron mold is about 1 meter high), of which multiple are straight-through wind turbine shaft outer circle molds and 1 is a through-type mold for connecting flanges).

[0064] like Figure 25 As shown, the wind turbine main shaft iron mold sand-coated casting process involves covering the inner cavity of each large iron mold with a layer of coated sand, and then stacking the corresponding wind turbine main shaft outer circular cavity iron mold sand-coated castings together to form a complete wind turbine main shaft outer circular contour cavity iron mold sand-coated casting. Because the sand coating layer of the iron mold sand-coated casting is relatively thin, and some mold cavity shapes are quite complex, in this embodiment, the molding sand for the large iron mold sand-coated casting still uses thermosetting phenolic resin coated sand with good fluidity. Therefore, during the sand coating molding process, the iron mold and model need to be heated to a certain temperature (generally within the range of 150-200℃) to meet the curing temperature requirements of the phenolic resin.

[0065] The principle of the heating device for multiple large iron molds and models in this embodiment is as follows: Large cast iron castings typically weigh between 10 and 30 tons. Their dimensions include a length of 4-6 meters, a width of 2-4 meters, and a height of 2-4 meters. The materials used include ductile iron and gray cast iron. Due to their structure, size, and casting process, it is often difficult to create the necessary molds using only two iron molds. For example, wind turbine main shaft castings typically have a length of 4-6 meters, a connecting flange diameter of 2.8-3.5 meters, and a main shaft journal outer diameter of 1.5-2.0 meters, classifying them as large ductile iron castings. The largest projected diameter of these large iron molds is approximately 5-6 meters, with a height of about 1 meter. Each iron mold weighs between ten and several tens of tons, and the model itself weighs over ten tons. When these types of castings are produced using iron mold sand casting, the mold is typically made of 4-5 pieces due to factors such as product structure, size, and casting process. A crane is used in a large pit to sequentially assemble these individual iron molds into a complete mold (e.g., ...). Figure 25 (As shown). In mass production of iron mold sand casting, because the size and weight of the mold are relatively small, the mold is generally heated directly by installing electric heating elements inside the mold plate and heating the mold through heat conduction. Iron molds generally use the residual heat generated after the molten iron is poured during casting production to heat the iron molds that need to be sand molded. For iron molds that are sand molded for the first time, natural gas or electric heating is used. For large iron molds, the weight of the mold and model is generally tens of tons or more. In the actual production of such large castings, multiple iron molds with different cavities often need to undergo sand-coating molding. Furthermore, the production efficiency of molds and castings for this type of casting is not as high as that required for mass production. Such heavy castings are generally not suitable for stress-relieving annealing. Therefore, to reduce stress generated during the solidification and cooling process of the molten iron, the molten iron needs a long solidification and cooling time in the mold, often requiring tens to hundreds of hours. The temperature of the iron mold often fluctuates from low to high to low under these production conditions. Often, before sand-coating molding, the temperature of the iron mold is already lower than the required temperature. For these types of castings, the iron mold also needs to be heated during sand-coating molding. Therefore, a completely new set of rules is needed for the heating methods of iron molds and models for these large castings to meet their temperature rise requirements.

[0066] The heating principle of the iron mold and model in this embodiment is to heat them together after they are molded together, using an external heating type electrothermal radiation heating method to raise their temperature. That is, the molded iron mold and model are placed in a fixed trolley heating furnace 1 by a gripping robot mechanism 2 for heating, so that the temperature of the iron mold and model after heating can be basically the same. After heating, the iron mold and model are placed on a mobile trolley 3 by the gripping robot mechanism 2, and then the iron mold and model are transferred to the sand coating molding device for sand coating molding.

[0067] Based on the above description, those skilled in the art are already able to implement it.

[0068] Furthermore, it should be noted that the specific embodiments described in this specification may differ in the shape and name of their parts and components. The above description is merely illustrative of the structure of this utility model. All equivalent or simple variations made based on the structure, features, and principles described in this utility model patent concept are included within the protection scope of this utility model patent. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, as long as they do not deviate from the structure of this utility model or exceed the scope defined in these claims, all of which should fall within the protection scope of this utility model.

Claims

1. A heating device for a large iron mold and model with multiple cavities, comprising a moving trolley (3) for carrying the iron mold and model after mold closing and a moving trolley track (4), wherein the moving trolley (3) is mounted on the moving trolley track (4), characterized in that: It also includes a gripping manipulator (2) and a fixed trolley heating furnace (1) equipped with a heating trolley (11). The gripping manipulator (2) grips the iron mold and model from the moving trolley (3) and moves them to the heating trolley (11) of the fixed trolley heating furnace (1). The gripping manipulator (2) includes a moving trolley (21), a moving track frame (22), a moving trolley track (23), a lifting beam (25), two hydraulic cylinders (26), two mechanical grippers (28), and four guide rails. The trolley (21) can move back and forth on the trolley track (23) on the moving track frame (22), and the moving track frame (22) is fixed on the columns (24). Two synchronously lifting hydraulic cylinders (26) are installed on the trolley (21), and the piston rod head of the hydraulic cylinder (26) is connected to the lifting beam (25). Four guide rods (27) are installed on the upper part of the lifting beam (25), and two mechanical grippers (28) are fixed on the bottom surface of the lifting beam (25).

2. The heating device for large iron molds and models with multiple different cavities according to claim 1, characterized in that: The mobile trolley (3) includes a trolley body (31), a positioning and running mechanism (32), an upper hook (33), wheels (34) and guide wheels (35). The positioning and running mechanism (32) is installed on the worktable of the mobile trolley. Multiple wheels (34) and guide wheels (35) are provided on the lower part of the trolley body (31). An upper hook (33) is also provided below the trolley body (31).

3. The heating device for large iron molds and models with multiple different cavities according to claim 2, characterized in that: The wheels (34) of the mobile trolley (3) are self-powered wheel systems.

4. The heating device for large iron molds and models with multiple different cavities according to claim 1, characterized in that: The fixed trolley heating furnace (1) also includes a trolley moving track (12), a heating furnace body (13) and a lifting furnace door (14). The heating trolley (11) is set on the trolley moving track (12), and the heating furnace body (13) is set on one side of the heating trolley (11). The lifting furnace door (14) is set at the heating trolley entrance of the heating furnace body (13).

5. The heating device for large iron molds and models with multiple different cavities according to claim 2, characterized in that: The positioning and operating mechanism (32) includes four positioning pins (321) arranged in a cross shape.

6. The heating device for large iron molds and models with multiple different cavities according to claim 1, characterized in that: The heating method uses an external heating furnace to heat the iron mold and model that are assembled together through heat radiation and heat convection.

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