Passing type sand shooting and covering device for large iron mold with different cavities and molding production method

Abstract

The present application relates to a kind of large iron mould through sand shooting and covering device of different cavity and its molding production method, it belongs to mechanical field.The present application includes sand shooting and covering mechanism, mobile trolley access track and multiple mobile trolleys, multiple mobile trolleys are on mobile trolley access track, sand shooting and covering mechanism includes frame structure, sand shooting head, track platform, four telescopic sand pipes, two sand shooting head lifting clamping hydraulic cylinders, two sand shooting clamping bosses and four track platform lifting hydraulic cylinders;The bottom of each telescopic sand pipe is connected with the sand shooting head below;Upper beam is equipped with two sand shooting head lifting clamping hydraulic cylinders, base has two sand shooting clamping bosses and four track platform lifting hydraulic cylinders, and four track platform lifting hydraulic cylinders are evenly distributed below track platform.The present application has reasonable structure design, is safe and reliable, low in labor intensity, low in cost, large iron mould sand casting quality is good, high in mechanization degree, easy to install, meet the use demand.

Description

TECHNICAL FIELD

[0001] The present application relates to an equipment and its method, in particular to a through sand shooting and covering device for a multi-piece different cavity large-scale iron mold (hereinafter referred to as multi-piece different large-scale iron mold) and its molding production method, which belongs to the field of casting production in the mechanical category. BACKGROUND

[0002] Iron mold sand casting belongs to the category of special casting, and its casting production has the advantages of green, high quality, energy saving, environmental protection, low cost, etc., and has been more and more applied, mainly applied to the casting production of large quantities of small and medium-sized castings.

[0003] In recent years, with the rapid development of equipment manufacturing industry, some large equipment puts forward higher requirements on the quality of its castings. The production rate of such castings (such as main shaft castings and planetary carrier castings in wind power castings) is not high, and they are large castings (the weight of the castings is more than 10 tons, and the maximum size is 3-6 meters). The casting mold for casting production often needs to be composed of multiple different shaped molds.

[0004] It is difficult to produce such castings by using the traditional sand mold casting production method to meet the requirements of internal organization, performance, precision, etc. The castings have become the key bottleneck for the improvement of such equipment. The iron mold sand casting is gradually applied in the production of these castings due to its unique rapid cooling, high mold rigidity, dense and smooth mold surface, and the compensating effect of graphitization expansion during the solidification of cast iron. The mold of these castings often needs to be composed of multiple molds, and the size and weight of the mold are very large. The existing single-station and double-station iron mold sand casting sand shooting and covering equipment cannot meet the sand shooting and covering molding requirements of these large-scale iron mold sand casting.

[0005] A utility model patent with the name of "a double-station iron mold sand molding machine with transverse movement" was announced on October 22, 2021, and the announcement number is CN214442875U. The patent includes a bottom plate, a top plate and a stand, two groups of lifting mechanisms are penetrated through the bottom plate, the lifting mechanism includes a lifting plate located above the bottom plate, the top surface of the lifting plate is provided with a molding mold, the top plate is provided with two groups of sand shooting mechanisms, the sand shooting mechanism includes a gas tank and a sand hopper fixed on the top surface of the top plate, and a sand cylinder and a shooting head component located at the bottom of the top plate, wherein the sand cylinder and the shooting head component are fixedly connected. Although the sand box is installed on the sand box containing table, and the sand box is used to shoot the molding mold with sand during the shooting process, the sand hopper can be used to inject sand into the sand box at the same time, so that the sanding and molding are carried out at the same time, and the production efficiency is improved, but it cannot meet the sand shooting and covering molding requirements of the large-scale iron mold sand casting mold described above, so it still has defects.

[0006] Therefore, developing an economic and feasible device for sequentially sanding and coating multiple large iron molds has become one of the keys to realize the production of such castings by iron mold sand coating casting. SUMMARY

[0007] The present application aims to overcome the above-mentioned deficiencies in the prior art, and provides a through-type sand shooting and coating device for multiple large iron molds with different cavities and a molding production method, which has reasonable structure design, is safe and reliable, has low labor intensity and cost, has good quality of large iron mold sand coating casting, has high degree of mechanization, and is easy to install.

[0008] The technical scheme adopted by the present application to solve the above problems is: the through-type sand shooting and coating device for multiple large iron molds with different cavities, comprising a mobile trolley in-out track and multiple mobile trolleys loaded with different models and iron molds, the multiple mobile trolleys are arranged on the mobile trolley in-out track, the mobile trolley comprises a trolley body, a positioning structure, wheels and guide wheels, the upper part of the trolley body is provided with multiple positioning structures, and the lower part of the trolley body is provided with multiple wheels and guide wheels, characterized in that: it further comprises a sand shooting and coating mechanism and a fixed sand shooting and coating station, the fixed sand shooting and coating station is a sand shooting and coating mechanism for large iron molds, the sand shooting and coating mechanism comprises a frame structure, a sand feeding hopper, a sand shooting head, an air bag, a track platform, four telescopic sand feeding pipes, multiple guide rods, two sand shooting head lifting and clamping hydraulic cylinders, two sand shooting clamping bosses and four track platform lifting hydraulic cylinders, the frame structure comprises a base, an upper beam and multiple columns, the upper beam is installed on the multiple columns, and the multiple columns are fixed on the base; four telescopic sand feeding pipes are evenly arranged below the sand feeding hopper, the bottom of each telescopic sand feeding pipe is connected with the sand shooting head below; the top of the guide rod is connected with the compressed air of the air bag through an air hose, and the lower part of the guide rod is installed on the upper surface of the sand shooting head; two sand shooting head lifting and clamping hydraulic cylinders are installed on the upper beam, two sand shooting clamping bosses are fixed on the upper surface of the base, four track platform lifting hydraulic cylinders are installed on the base, and the four track platform lifting hydraulic cylinders are evenly distributed below the track platform.

[0009] As a preferred embodiment, the working plane of the mobile trolley is provided with a positioning device between the model and the trolley, and some locking screw holes are arranged between the model and the trolley, which can be used for positioning and fixed locking between the model and the trolley.

[0010] As a preferred embodiment, the lower surface of the mobile trolley is provided with a mobile trolley clamping stress structure; which is used to bear the clamping force (3-5 tons) of the sand shooting head lifting and clamping hydraulic cylinder of the sand shooting and coating equipment during sand shooting and coating molding, as well as the gravity of the sand shooting head, the iron mold, the model and the mobile trolley, etc.

[0011] As a preferred embodiment, the guide rod is four, and the four guide rods are distributed in a matrix above the sand shooting head, and the four guide rods are hollow guide rods.

[0012] As preferred, the guide rod of the present application is used for guiding the rising or falling of the sand shooting head, and is also used for evenly introducing the compressed air required for sand shooting and covering sand molding of the iron mold from the air storage bag to the sand shooting head cavity through the four matrix distributed hollow guide rods, so that the coated sand in the sand shooting head is evenly shot into the gap between the large iron mold and the model under the action of the compressed air, and the sand shooting and covering sand molding of the iron mold is completed.

[0013] As preferred, the mobile trolley of the present application is an electric automatic trolley, and the power required for the movement of the mobile trolley is supplied by a battery or a low-voltage device.

[0014] As preferred, the upper end of the piston rod of each track platform lifting hydraulic cylinder is connected with the track platform, the lifting stroke of the track platform lifting hydraulic cylinder is 50 mm, and the track platform can be lifted by driving the four track platform lifting hydraulic cylinders to lift.

[0015] As preferred, the frame structure of the present application is composed of an upper beam, a column and a base connected together to form a rigid structure.

[0016] The application also provides a molding production method of a multi-piece large-scale iron mold through type sand shooting and coating device, which is characterized by the following specific steps: after the molding of all the models / iron molds / movable trolleys needing sand shooting and coating is completed, the models / iron molds / movable trolleys are arranged in sequence on the movable trolley access track outside the one side of the through type sand shooting and coating device; the piston rods of the two sand shooting head lifting and clamping hydraulic cylinders in the sand shooting and coating mechanism are lifted to the highest position, driving the sand shooting heads to be lifted to the highest position; the piston rods of the four track platform lifting hydraulic cylinders are lifted to the highest position, driving the track platforms to be lifted to the highest position, and the upper plane of the movable trolley access track is consistent with the upper plane height of the track outside the sand shooting and coating device station; the first arranged model / iron mold / movable trolley automatically enters the sand shooting and coating device station and stops, the piston rods of the four track platform lifting hydraulic cylinders are gradually lowered, driving the track platforms and the movable trolleys to be lowered together, when the lower plane of the movable trolley contacts with the upper plane of the sand shooting clamping convex platform, the movable trolley stops lowering, the piston rods of the four track platform lifting hydraulic cylinders continue to be lowered, driving the track platforms to continue to be lowered, when the track platforms are lowered to the lowest position, the wheels of the movable trolley are completely separated from the tracks on the track platforms, the wheels of the movable trolley are no longer forced, and the whole weight of the movable trolley / iron mold / model is borne on the sand shooting clamping convex platform; the piston rods of the two sand shooting head lifting and clamping hydraulic cylinders are lowered, driving the sand shooting heads to be lowered, when the lower plane of the sand shooting heads contacts with the upper plane of the iron mold, the sand shooting head lifting and clamping hydraulic cylinders stop lowering, and the clamping force generated by the sand shooting head lifting and clamping hydraulic cylinders tightly clamps the sand shooting heads, the iron mold, the model and the movable trolley together; the air valve of the air bag is opened, the compressed air in the air bag enters the sand shooting head cavity through the hollow guide rod, the coated sand in the sand shooting heads is shot into the gap between the model and the iron mold cavity, the sand shooting and coating molding is completed, and the remaining compressed air in the sand shooting head cavity is discharged to the atmosphere through the exhaust valve arranged on the sand shooting head; the piston of the sand shooting head lifting and clamping hydraulic cylinder is lifted to the highest position, the lower plane of the sand shooting head is completely separated from the upper plane of the iron mold, so that the clamping force between the sand shooting head, the model, the iron mold and the movable trolley is released; the piston rods of the four track platform lifting hydraulic cylinders are lifted, driving the track platforms to be lifted, the wheels of the movable trolley contact with the movable trolley access track, the sand shooting clamping convex platform is separated from the bottom surface of the movable trolley, when the upper plane of the track on the movable trolley platform is consistent with the upper plane height of the outer track, the piston of the four track platform lifting hydraulic cylinders reaches the highest position; the movable trolley automatically moves to the other side track outside the sand shooting and coating device station, until it completely drives away from the sand shooting and coating device station, the sand shooting and coating molding of the iron mold is completed by the device; the above production operation process is sequentially cycled, so that the sand shooting and coating molding operation of all the different large-scale iron molds on one side of the sand shooting and coating device is completed, and the iron molds / models / movable trolleys after the operation are sequentially moved to the other side of the sand shooting and coating device station.

[0017] Compared with the prior art, the present application has the following advantages and effects: (1) the overall structure is reasonable and safe and reliable, and through one sand shooting and covering device in the present application, the sand shooting and covering molding operation of multiple large iron molds of different shapes and sizes in a large casting mold can be completed; (2) the sand shooting and covering forming of multiple large iron molds is carried out by using the device, the process flow is smooth, the forming process of the iron mold sand covering mold is highly mechanized, the labor intensity is low, the automation control of the sand shooting and covering process is easy to realize, and the quality of the large iron mold sand covering mold is good; (3) the investment cost of the large iron mold sand shooting and covering device is low, the equipment is easy to install, the operation is reliable, and the maintenance cost is low; (4) combined with other matching devices, a large iron mold sand covering mold molding line can be formed, the mechanized production of the large iron mold sand covering mold is realized, and thus the batch production of the iron mold sand casting large castings is realized. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structure schematic diagram of a wind power main shaft casting of an embodiment of the present application Figure 1 .

[0019] Figure 2 is a structure schematic diagram of a wind power main shaft casting of an embodiment of the present application Figure 2 .

[0020] Figure 3 is a structure schematic diagram of a wind power main shaft casting of an embodiment of the present application

[0021] Figure 4 is a structure schematic diagram of a wind power main shaft casting of an embodiment of the present application

[0022] Figure 5 is a structure schematic diagram of a wind power main shaft casting of an embodiment of the present application

[0023] Figure 6 is a structure schematic diagram of a wind power main shaft casting of an embodiment of the present application

[0024] Figure 7 is a structure schematic diagram of a wind power main shaft casting of an embodiment of the present application

[0025] Figure 8 is a structure schematic diagram of a wind power main shaft casting of an embodiment of the present application

[0026] Figure 9 is a structure schematic diagram of a wind power main shaft casting of an embodiment of the present application

[0027] Figure 10 is a structure schematic diagram of a wind power main shaft casting of an embodiment of the present application

[0028] Figure 11is the top view structural schematic diagram of the mobile trolley in the embodiment of the present application.

[0029] Figure 12 is the three-dimensional structural schematic diagram of the mobile trolley in the embodiment of the present application.

[0030] Figure 13 is the sand shooting and covering molding process schematic diagram in the embodiment of the present application, in which the track platform, the sand shooting head is raised to the position, and the iron mold / model / mobile trolley which needs to be sand shot and covered is arranged in sequence on one side.

[0031] Figure 14 is the sand shooting and covering molding process schematic diagram in the embodiment of the present application, in which the iron mold / model / mobile trolley enters the sand shooting and covering station.

[0032] Figure 15 is the sand shooting and covering molding process schematic diagram in the embodiment of the present application, in which the track platform is lowered, and the bottom surface of the mobile trolley is in contact with the sand shooting clamping convex platform.

[0033] Figure 16 is the sand shooting and covering molding process schematic diagram in the embodiment of the present application, in which the track platform is continuously lowered, and the mobile trolley wheel is completely separated from the track platform track.

[0034] Figure 17 is the sand shooting and covering molding process schematic diagram in the embodiment of the present application, in which the sand shooting head is lowered, and the iron mold / model / mobile trolley is clamped after sand shooting and covering molding.

[0035] Figure 18 is the sand shooting and covering molding process schematic diagram in the embodiment of the present application, in which the sand shooting and covering molding is completed, the sand shooting head is raised to the top, and the iron mold is completely released from clamping.

[0036] Figure 19 is the sand shooting and covering molding process schematic diagram in the embodiment of the present application, in which the track platform is raised to the position, and the mobile trolley is separated from the sand shooting clamping convex platform.

[0037] Figure 20 is the sand shooting and covering molding process schematic diagram in the embodiment of the present application, in which the iron mold / model / mobile trolley which is completed molding leaves the sand shooting and covering station.

[0038] Figure 21 is the sand shooting and covering molding process schematic diagram in the embodiment of the present application, in which the iron mold / model / mobile trolley which is completed sand shooting and covering molding is arranged in sequence on the other side of the sand shooting and covering station.

[0039] In the figure: frame structure I, sand shooting and covering mechanism 1, fixed sand shooting and covering station 2, mobile trolley 3, mobile trolley access track 4, electrical control system 5; lifting stroke H;

[0040] Sand shooting and covering mechanism 1: base 1-1, stand column 1-2, upper beam 1-3, air bag 1-4, sand adding hopper 1-5, sand shooting head 1-6, sand shooting head lifting and clamping hydraulic cylinder 1-7, guide rod 1-8, track platform 1-9, track platform lifting hydraulic cylinder 1-10, sand shooting clamping boss 1-11, telescopic sand adding pipe 1-12, guardrail 1-13, hydraulic station 1-14;

[0041] Mobile trolley 3: trolley body 31, positioning structure 32, wheel 33, guide wheel 34. DETAILED DESCRIPTION

[0042] The application will be further described in detail below with reference to the drawings and by examples, and the following examples are used to explain the application but the application is not limited to the following examples.

[0043] EXAMPLE

[0044] Referring to Figures 1 to 21 , the through type sand shooting and covering device for multiple large iron molds with different cavities comprises a sand shooting and covering mechanism 1 and a fixed sand shooting and covering station 2, a mobile trolley access track 4, an electrical control system 5 and multiple mobile trolleys 3 loaded with different models and iron molds, the multiple mobile trolleys 3 are arranged on the mobile trolley access track 4, and the fixed sand shooting and covering station 2 is the sand shooting and covering mechanism 1 for the large iron mold.

[0045] The sand shooting and covering mechanism 1 in the example comprises a base frame structure I, an air bag 1-4, a sand adding hopper 1-5, a sand shooting head 1-6, two sand shooting head lifting and clamping hydraulic cylinders 1-7, multiple guide rods 1-8, a track platform 1-9, four track platform lifting hydraulic cylinders 1-10, two sand shooting clamping bosses 1-11, four telescopic sand adding pipes 1-12, a guardrail 1-13 and a hydraulic station 1-14.

[0046] The frame structure I in the example comprises a base 1-1, an upper beam 1-3 and multiple stand columns 1-2, the upper beam 1-3 is installed on the multiple stand columns 1-2, and the multiple stand columns 1-2 are fixed on the base 1-1.

[0047] The upper beam 1-3 is a welded steel structure platform, the upper beam 1-3 is fixed on the four stand columns 1-2, the four stand columns 1-2 are installed on the base 1-1, and the upper beam 1-3, the stand columns 1-2 and the base 1-1 are connected together to form a rigid frame structure.

[0048] The upper beam 1-3 is installed to bear all the sand shooting and covering device components, the sand adding hopper 1-5 for containing sand for sand shooting and covering is installed, four telescopic sand adding pipes 1-12 are evenly arranged and installed below the sand adding hopper 1-5, the bottom of each telescopic sand adding pipe 1-12 is connected with the lower sand shooting head 1-6 for uniformly conveying the sand contained in the sand adding hopper 1-5 into the sand shooting head cavity.

[0049] In this embodiment, the four guide rods 1-8 for guiding the up and down movement of the sand shooting heads 1-6 are arranged in a matrix above the sand shooting heads 1-6. The four guide rods 1-8 are hollow guide rods. The top of the guide rods 1-8 is connected to the compressed air hose of the air tank 1-4. The lower part of the guide rods 1-8 is fixed to the upper surface of the sand shooting heads 1-6. The guide rods 1-8 are used for guiding the up and down movement of the sand shooting heads 1-6, and at the same time, the compressed air needed for the sand shooting and sand covering of the iron mold is introduced from the air tank through the four matrix arranged hollow guide rods 1-8 to the mold cavity of the sand shooting heads 1-6, so that the coated sand in the sand shooting heads 1-6 is uniformly shot into the gap between the large iron mold and the mold under the action of compressed air, and the sand shooting and sand covering of the iron mold is completed.

[0050] In this embodiment, two sand shooting head lifting and clamping hydraulic cylinders 1-7 are fixed on the upper beam 1-3, which are used for clamping between the sand shooting heads 1-6 and the mold / iron mold during the sand shooting and sand covering of the iron mold. The base 1-1 is a steel structure welded part. Two sand shooting and clamping bosses 1-11 are installed on the upper surface of the base 1-1, which are used to bear the force (generally more than 3-5 hundred tons) generated by the mold / iron mold / movable trolley 3, sand shooting heads 1-6, and sand shooting head lifting and clamping cylinders 1-7 during the sand shooting and sand covering process. Four track platform lifting hydraulic cylinders 1-10 are also fixed on the base 1-1 and are uniformly distributed below the track platform 1-9, which are used for lifting the track platform 1-9.

[0051] In this embodiment, the upper end of the piston rod of each track platform lifting hydraulic cylinder 1-10 is connected to the track platform 1-9. The lifting stroke H of the track platform lifting hydraulic cylinder 1-10 is 50 mm. With the lifting of the four track platform lifting hydraulic cylinders 1-10, the track platform 1-9 can be lifted.

[0052] The track platform 1-9 is a steel structure welded platform, which can also be made into a cast structure. The platform surface of the track platform 1-9 has two rectangular through holes. The two through holes are used to pass through the two sand shooting and clamping bosses 1-11 installed on the base 1-1.

[0053] In this embodiment, the movable trolley 3 includes a trolley body 31, a positioning structure 32, a wheel 33, and a guide wheel 34. The upper part of the trolley body 31 is provided with multiple positioning structures 32. The lower part of the trolley body 31 is provided with multiple wheels 33 and guide wheels 34.

[0054] Two tracks for the movable trolley 3 to enter and exit the sand shooting and sand covering device station are installed on the trolley track platform, which is used for the movable trolley 3 to enter and exit the sand shooting and sand covering device.

[0055] In this embodiment, the movable trolley 3 is an electric automatic trolley (attached drawings Figure 5The power required for the movement of the mobile trolley 3 can be supplied by batteries or low-voltage devices. Through the electrical control system 5, each mobile trolley 3 can be automatically moved to the work position that needs to be operated according to the requirements of the iron mold sand shooting and sand covering process.

[0056] In this embodiment, the working plane of the mobile trolley 3 is equipped with a positioning device between the model and the mobile trolley 3, and some locking screw holes between the model and the mobile trolley 3 are provided, which can be used for positioning and fixing the model and the mobile trolley 3; the lower plane of the mobile trolley 3 is provided with a mobile trolley clamping force structure, which is used to bear the clamping force (3-5 hundred tons) of the hydraulic cylinder 1-7 for lifting and clamping the sand shooting head when the sand shooting and sand covering equipment is performing sand shooting and sand covering molding, as well as the gravity of the sand shooting head, iron mold, model, and mobile trolley 3.

[0057] The sand-shooting and sand-coating operations of multiple different large iron molds in this application can be automatically / manually operated through the electrical control system 5.

[0058] Based on the structural characteristics of large iron molds and the requirements for sand shooting and coating molding, this embodiment uses multiple trolleys loaded with different models and iron molds to enter the fixed iron mold sand shooting and coating device station in sequence, and to complete the sand shooting and coating operations of multiple different iron molds in sequence.

[0059] Large castings are produced using iron molds with sand coating. Due to factors such as the casting structure, size, mold requirements, and other casting process requirements, more than two large iron molds are often needed to be combined to form the iron mold with sand coating required for the large casting, such as wind turbine main shaft castings. Figure 1 The iron mold with sand coating that forms its outer contour uses multiple iron molds of different shapes and sizes (generally four along the length of the main wind turbine shaft, of which multiple are straight-through wind turbine shaft outer circle molds, and one is a through-type mold for connecting flanges). Figure 2 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. The molding sand for the large iron mold sand-coated casting still uses thermosetting phenolic resin coated sand with good fluidity. The molding cavity of the iron mold sand-coated layer is formed using the traditional sand-shooting sand-coating method, that is: under the action of compressed air, the coated sand is injected into the gap between the mold and the iron mold to form a sand-coated layer. Under the action of heat, the sand-coated layer solidifies, the mold is removed, and finally the iron mold sand-coated casting is formed. The key to the iron mold sand-shooting sand-coating device is to complete the sand-shooting sand-coating operation of multiple different molds / iron molds in one sand-shooting sand-coating mechanism 1. From Figure 3It can be seen that the through sand shooting sand molding equipment is composed of a plurality of model / iron type loading moving trolleys 3, a frame structure I, a sand shooting and sanding mechanism 1, a track platform 1-9, a track platform lifting hydraulic cylinder 1-10, and an electrical control system 5.

[0060] The principle of the through sand shooting sand molding device for multiple large iron types of the embodiment is as follows: The weight of large cast iron castings is generally 10-30 tons, the length in the appearance size of the castings is 4-6 meters, the width size is 2-4 meters, and the height size is 2-4 meters. The material of the castings is nodular cast iron, gray cast iron, etc. Due to reasons such as structure, size, and casting process, it is often difficult to use only two iron types to form the casting mold required for casting production. For example, the wind power main shaft casting has a product size of generally 4-6 meters in length, 2.8-3.5 meters in diameter of the connecting flange, and 1.5-2.0 meters in diameter of the main shaft neck outer circle, which belongs to large nodular cast iron castings. The largest projected diameter of these large iron types is about 5-6 meters, the height is about 1 meter, and the weight of each iron type is different, being ten to several dozen tons, and the weight of the model is also more than ten tons. When the iron type sanding casting production is used for this type of casting, due to reasons such as product structure, size, and casting process, the casting mold often needs to be formed by combining 4-5 iron types to form a complete casting mold (see Figure 2 ). The traditional iron type sanding casting sand shooting and sanding molding device is often a single station, double station sanding molding machine, that is, each sand shooting and sanding molding machine can complete the sanding molding operation of a single iron type or two different iron types. If sand shooting and sanding molding of four or more different iron types is required, multiple sanding molding devices need to be configured. For large iron types with extremely large size and weight, the clamping force between the model / iron type / sand shooting plate during sand shooting and sanding is often hundreds of tons, and the weight of only one large iron type sand shooting and sanding station device is hundreds of tons or more. The manufacturing cost of the device is huge, and if multiple traditional large sanding molding equipment is used for the sanding molding of this type of casting iron type, only the investment in sanding molding equipment is difficult to bear. Unlike the iron type sanding casting production of large quantities of small and medium-sized castings, the production efficiency of the iron type sanding casting of large castings is relatively low, and it often takes several hours to complete an iron type sanding casting mold. Therefore, the sand shooting and sanding molding equipment for large iron types of the present application only uses one sand shooting and sanding station, and the several models / iron types required for an iron type sanding casting mold are installed on several moving trolleys 3. The moving trolleys 3 enter the sand shooting and sanding station of the present application in turn, and the sand shooting and sanding operation of the several iron types required for an iron type sanding casting mold is completed one by one.

[0061] The molding production process of the through sand shooting and coating device of the multi-piece different cavity large iron mold is as follows: the models / molds / movable trolleys 3 which need to be shot and coated are arranged in sequence on the movable trolley access track 4 outside the one side of the through sand shooting and coating device station; the piston rods of the two sand shooting head lifting and clamping hydraulic cylinders 1-7 installed on the upper beam 1-3 of the sand shooting and coating mechanism 1 are lifted to the highest position, and the sand shooting heads 1-6 are lifted to the highest position; the piston rods of the four track platform lifting hydraulic cylinders 1-10 installed on the base 1-1 are lifted to the highest position, the track platform 1-9 is lifted to the highest position, and the upper plane of the movable trolley access track 4 is consistent with the upper plane height of the track outside the sand shooting and coating device station; the first arranged model / mold / movable trolley 3 automatically enters the sand shooting and coating device station position and stops, the piston rods of the four track platform lifting hydraulic cylinders 1-10 are gradually lowered, the track platform 1-9 and the movable trolley 3 are lowered together, when the lower plane of the movable trolley 3 contacts with the upper plane of the sand shooting clamping convex platform 1-11 fixedly arranged on the base 1-1, the movable trolley 3 stops descending, the piston rods of the four track platform lifting hydraulic cylinders 1-10 continue to descend, the track platform 1-9 continues to descend, when the track platform 1-9 descends to the lowest position (the hydraulic cylinder stroke is about 50 mm), the wheels 33 of the movable trolley 3 are completely separated from the track on the track platform 1-9, the wheels 33 of the movable trolley 3 are no longer forced, and the whole weight of the movable trolley 3 / mold / model is borne on the sand shooting clamping convex platform 1-11; the piston rods of the two sand shooting head lifting and clamping hydraulic cylinders 1-7 in the sand shooting and coating mechanism 1 are lowered, and the sand shooting heads 1-6 are lowered, when the lower plane of the sand shooting head 1-6 contacts with the upper plane of the mold, the sand shooting head lifting and clamping hydraulic cylinder 1-7 stops descending, and the clamping force generated by the sand shooting head lifting and clamping hydraulic cylinder 1-7 tightly clamps the sand shooting head 1-6, the mold, the model and the movable trolley 3 together; the air valve of the air bag 1-4 is opened, the compressed air in the air bag 1-4 enters the sand shooting head 1-6 cavity through the hollow guide rod 1-8, the coated sand in the sand shooting head 1-6 is shot into the gap between the mold and the mold cavity, the sand shooting and coating molding is completed, and the remaining compressed air in the sand shooting head 1-6 cavity is discharged to the atmosphere through the exhaust valve arranged on the sand shooting head 1-6; the piston of the sand shooting head lifting and clamping hydraulic cylinder 1-7 is lifted to the highest position, the lower plane of the sand shooting head 1-6 is completely separated from the upper plane of the mold, so that the clamping force between the sand shooting head 1-6, the model, the mold and the movable trolley 3 is released; the piston rods of the four track platform lifting hydraulic cylinders 1-10 of the track platform 1-9 are lifted, the track platform 1-9 is lifted, the wheels 33 of the movable trolley 3 contact with the movable trolley access track 4, the sand shooting clamping convex platform 1-11 is separated from the bottom surface of the movable trolley 3, when the upper plane of the track on the platform of the movable trolley 3 is consistent with the upper plane height of the outer track, the piston of the four track platform lifting hydraulic cylinders 1-10 reaches the highest position;The mobile trolley 3 automatically moves to the other track outside the sand shooting and covering device station, until it completely drives away from the sand shooting and covering device station, and the sand shooting and covering of the iron mold is completed. The above production operation process is sequentially cycled, so that the sand shooting and covering operation of different large iron molds on one side of the sand shooting and covering device is completed, and the iron mold / model / mobile trolley 3 after the operation is sequentially moved to the other side of the sand shooting and covering station.

[0062] Through the above description, those skilled in the art can implement it.

[0063] In addition, it should be noted that the specific embodiments described in the specification, the shape of the parts and components, the name taken, etc. can be different, and the above description in the specification is only an example of the structure of the present application. Any equivalent changes or simple changes made according to the structure, features and principles described in the patent concept of the present application are included in the protection scope of the present application. Those skilled in the art can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, as long as they do not deviate from the structure of the present application or exceed the scope defined by the present claims, which shall belong to the protection scope of the present application.

Claims

1. A through-type sand shooting and coating device for large iron molds with different cavities, comprising a moving trolley access track (4) and a plurality of moving trolleys (3) loaded with different molds and iron molds, wherein the plurality of moving trolleys (3) are arranged on the moving trolley access track (4), and each moving trolley (3) comprises a trolley body (31), a positioning structure (32), a wheel (33), and a guide wheel (34), wherein the upper part of the trolley body (31) is provided with a plurality of positioning structures (32), and the lower part of the trolley body (31) is provided with a plurality of wheels (33) and guide wheels (34), characterized in that: Also include sand shooting sand mechanism (1) and fixed sand shooting sand station (2), the fixed sand shooting sand station (2) is the sand shooting sand mechanism (1) of large iron type, the sand shooting sand mechanism (1) includes frame structure (I), sand adding hopper (1-5), sand shooting head (1-6), air bag (1-4), track platform (1-9), four telescopic sand adding pipes (1-12), multiple guide rods (1-8), two sand shooting head lifting clamping hydraulic cylinders (1-7), two sand shooting clamping bosses (1-11) and four track platform lifting hydraulic cylinders (1-10), frame structure (I) includes base (1-1), upper beam (1-3) and multiple columns (1-2), upper beam (1-3) is installed on multiple columns (1-2), and multiple columns (1-2) are fixed on base (1-1); four telescopic sand adding pipes (1-12) are evenly arranged below sand adding hopper (1-5), and the bottom of each telescopic sand adding pipe (1-12) is connected with the sand shooting head (1-6) below; the top of guide rod (1-8) is connected with the compressed air of air bag (1-4) through air hose, and the lower part of the guide rod (1-8) is installed on the plane of sand shooting head (1-6); two sand shooting head lifting clamping hydraulic cylinders (1-7) are installed on upper beam (1-3), two sand shooting clamping bosses (1-11) are fixed on the plane of base (1-1), four track platform lifting hydraulic cylinders (1-10) are installed on base (1-1), and the four track platform lifting hydraulic cylinders (1-10) are evenly distributed below track platform (1-9). ​ 2. The through-feed sand-coating apparatus for large iron molds having multiple different cavities of claim 1, wherein: The positioning device between the model and the trolley and the locking screw holes between the model and the mobile trolley (3) are installed on the working plane of the mobile trolley (3), which can be used for positioning and fixed locking between the model and the mobile trolley (3).

3. The through-feed sand-coating apparatus for large iron molds having multiple different cavities according to claim 1 or 2, characterized in that: The lower plane of the mobile trolley (3) is provided with a mobile trolley clamping stress structure.

4. The through-going sand-coating apparatus for large iron molds having multiple distinct cavities of claim 1, wherein: The guide rod (1-8) is four, and the four guide rods (1-8) are distributed in matrix above the sand shooting head (1-6), and the four guide rods are hollow guide rods (1-8).

5. The through-feed sand-coating apparatus for large iron molds having multiple distinct cavities of claim 4, wherein: The guide rod (1-8) is used for guiding when the sand shooting head (1-6) rises or falls, and is also used for introducing the compressed air required for sand shooting and sand coating molding of the iron mold from the air storage bag to the sand shooting head (1-6) cavity through the four matrix distributed hollow guide rods (1-8), so that the film sand in the sand shooting head (1-6) is uniformly shot and filled into the gap between the large iron mold and the model under the action of compressed air, and the sand shooting and sand coating molding of the iron mold is completed.

6. The through-feed sand coating apparatus for large iron molds having multiple different cavities according to claim 1 or 2, characterized in that: The mobile trolley (3) is an electric automatic trolley, and the power required for the movement of the mobile trolley (3) is supplied by a battery or a low voltage device.

7. The through-feed sand overlaying apparatus for large iron molds having multiple distinct cavities of claim 1, wherein: The upper end of the piston rod of each track platform lifting hydraulic cylinder (1-10) is connected with the track platform (1-9), the lifting stroke of the track platform lifting hydraulic cylinder (1-10) is 50mm, and the track platform (1-9) can be lifted by the four track platform lifting hydraulic cylinders (1-10).

8. The through-feed sand overlaying apparatus for large iron molds having multiple distinct cavities of claim 1, wherein: The frame structure (I) is composed of an upper beam (1-3), a stand column (1-2) and a base (1-1) connected together to form a rigid structure.

9. A molding production method of a through sand shooting and coating apparatus for a large-sized iron mold having a plurality of different cavities, using the through sand shooting and coating apparatus for a large-sized iron mold having a plurality of different cavities according to any one of claims 1 to 8, characterized in that: The specific steps are as follows: the models / iron molds / movable trolleys (3) which need to be sand coated are arranged on the movable trolley in-out track (4) outside the through-type sand coating device station in sequence; the piston rods of the two sand head lifting and clamping hydraulic cylinders (1-7) in the sand coating mechanism (1) are lifted to the highest position, driving the sand heads (1-6) to rise to the highest position; the piston rods of the four track platform lifting hydraulic cylinders (1-10) are lifted to the highest position, the track platform (1-9) is lifted to the highest position, and the upper plane of the movable trolley in-out track (4) is consistent with the upper plane height of the track outside the sand coating device station; the first arranged model / iron mold / movable trolley (3) automatically enters the sand coating device station position and stops, the piston rods of the four track platform lifting hydraulic cylinders (1-10) are gradually lowered, driving the track platform (1-9) and the movable trolley (3) to descend together, when the lower plane of the movable trolley (3) contacts the upper plane of the sand clamping convex platform (1-11), the movable trolley (3) no longer descends, the piston rods of the four track platform lifting hydraulic cylinders (1-10) continue to descend, driving the track platform (1-9) to continue to descend, when the track platform (1-9) descends to the lowest position, the wheels (33) of the movable trolley (3) are completely separated from the track on the track platform (1-9), the wheels (33) of the movable trolley (3) are no longer forced, and the whole weight of the movable trolley (3) / iron mold / model is borne on the sand clamping convex platform (1-11); the piston rods of the two sand head lifting and clamping hydraulic cylinders (1-7) in the sand coating mechanism (1) are lowered, driving the sand heads (1-6) to descend, when the lower plane of the sand heads (1-6) contacts the upper plane of the iron mold, the sand head lifting and clamping hydraulic cylinders (1-7) no longer descend, and the clamping force generated by the sand head lifting and clamping hydraulic cylinders (1-7) tightly clamps the sand heads (1-6), the iron mold, the model and the movable trolley (3) together; the air valve of the air bag (1-4) is opened, the compressed air in the air bag (1-4) enters the sand head (1-6) cavity through the hollow guide rod (1-8), the coated sand in the sand head (1-6) is shot into the gap between the model and the iron mold cavity, the sand coating molding is completed, and the remaining compressed air in the sand head (1-6) cavity is discharged to the atmosphere through the exhaust valve arranged on the sand head (1-6); the piston of the sand head lifting and clamping hydraulic cylinder (1-7) is lifted to the highest position, the lower plane of the sand head (1-6) is completely separated from the upper plane of the iron mold, thereby releasing the clamping force between the sand head (1-6), the model, the iron mold and the movable trolley (3); the piston rods of the four track platform lifting hydraulic cylinders (1-10) of the track platform (1-9) are lifted, driving the track platform (1-9) to rise, the wheels (33) of the movable trolley (3) contact the movable trolley in-out track (4), the sand clamping convex platform (1-11) is separated from the bottom surface of the movable trolley (3), and when the upper plane of the track on the platform of the movable trolley (3) is consistent with the upper plane height of the outer track, the pistons of the four track platform lifting hydraulic cylinders (1-10) reach the highest position;The mobile trolley (3) automatically moves to the other side track outside the sand shooting and covering device station until completely driving off the sand shooting and covering device station, and the sand shooting and covering device completes the sand shooting and covering molding of the iron type; the above production operation process is sequentially circulated, so that the sand shooting and covering molding operation of all different large iron types on one side of the sand shooting and covering device is completed, and the iron type / model / mobile trolley (3) after the operation is sequentially moved to the other side of the sand shooting and covering station.

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