Pass-type sand shooting and coating device for multiple large iron molds with different cavities

Abstract

The utility model relates to a through-type sand shooting and coating device for a plurality of large iron molds with different cavities, and belongs to the field of machinery. The sand shooting and coating device comprises a sand shooting and coating mechanism, a moving trolley in-out track and a plurality of moving trolleys which are arranged on the moving trolley in-out track, the sand shooting and coating mechanism comprises a frame structure, a sand shooting head, a track platform, four telescopic sand adding pipes, two sand shooting head lifting and clamping hydraulic cylinders, two sand shooting clamping bosses and four track platform lifting hydraulic cylinders; the bottom of each telescopic sand adding pipe is connected with the sand shooting head below the telescopic sand adding pipe; two sand shooting head lifting and clamping hydraulic cylinders are arranged on the upper beam, two sand shooting clamping bosses and four rail platform lifting hydraulic cylinders are arranged on the base, and the four rail platform lifting hydraulic cylinders are uniformly distributed below the rail platform. The device is reasonable in structural design, safe, reliable, low in labor intensity, low in cost, good in large-scale sand-lined iron mold casting quality, high in mechanization degree and convenient to install, and meets the use requirements.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of equipment, more particularly to a kind of multi-piece different cavity large-scale iron mold (hereinafter referred to as multi-piece different large-scale iron mold) through sand shooting and sand covering device, it belongs to the field of foundry production in mechanical class. BACKGROUND

[0002] Iron mold sand coated casting belongs to the category of special casting, and its casting production has the advantages of green, high quality, energy saving, environmental protection and low cost, and has been more and more applied, mainly applied to the casting production of large quantities of small 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, and the production rate of such castings (such as: main shaft castings, planetary gear castings and other castings in wind power castings) is not high, and it is a large casting (the weight of the casting is more than 10 tons, and the maximum size is 3-6 meters), The casting mold used for casting production often needs to be combined by multiple different shapes of casting molds.

[0004] It is difficult to produce such castings by using traditional sand casting production method to meet the requirements of internal organization, performance and precision, and the castings have become the key bottleneck for the improvement of such equipment. Iron mold sand coated casting mold gradually applies to the production of these castings due to its unique rapid cooling, high casting rigidity, dense and smooth casting surface, and the characteristics of the expansion of graphitization during the casting of cast iron. The casting mold of these castings often needs to be combined by multiple casting molds, and the size and weight of the casting mold are very large. The existing single-station and double-station iron mold sand coated casting mold sand shooting and sand covering equipment can hardly meet the sand shooting and sand covering molding requirements of these large iron mold sand coated casting molds.

[0005] Therefore, it is one of the keys to realize the production of such castings by iron mold sand coated casting to develop an economical and feasible device that can sequentially shoot and cover sand for multiple large iron molds. CONTENT OF THE UTILITY MODEL

[0006] The utility model aims at overcoming the above-mentioned deficiencies in the prior art, and provides a through sand shooting and sand covering device for multi-piece different cavity large-scale iron mold, which has reasonable structure design, is safe and reliable, has low labor intensity, low cost, good quality of large-scale iron mold sand coated casting, high degree of mechanization and convenient installation.

[0007] The utility model discloses a technical scheme that solves the above problems is: this multiblock different cavity large -scale iron type's through -type sand shooting and covering device, including mobile trolley in -out track and multitable mobile trolley, multitable mobile trolley all are arranged on mobile trolley in -out track, its characterized in that: still include sand shooting and covering mechanism, sand shooting and covering mechanism includes frame structure, sand adding hopper, sand shooting head, gas bag, track platform, four telescopic sand adding pipes, multiple guide rods, two sand shooting head elevating and clamping hydraulic cylinders, two sand shooting clamping bosses and four track platform elevating hydraulic cylinders, and four telescopic sand adding pipes are evenly arranged under the sand adding hopper, and the bottom of each telescopic sand adding pipe is connected with the sand shooting head below, the top of guide rod is connected with the compressed air of gas bag through air hose, and the lower part of the guide rod is installed on the plane of sand shooting head, two sand shooting head elevating and clamping hydraulic cylinders are installed on the upper beam, two sand shooting clamping bosses are fixed on the base plane, four track platform elevating hydraulic cylinders are installed on the base, and the four track platform elevating hydraulic cylinders are evenly distributed below the track platform.

[0008] As preferred, the mobile trolley comprises a vehicle body, a positioning structure, a wheel and a guide wheel, the upper part of the vehicle body is provided with multiple positioning structures, and the lower part of the vehicle body is provided with multiple wheels and guide wheels.

[0009] As preferred, 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.

[0010] As preferred, the columns are four, and the four columns are all fixed on the base.

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

[0012] As preferred, the piston rod upper end of each track platform elevating hydraulic cylinder is connected with the track platform, and the lifting stroke of the track platform elevating hydraulic cylinder is 50 mm.

[0013] As preferred, the track platform is a steel structure welded platform, the platform surface of the track platform is provided with two rectangular through holes, and the two through holes are used for passing through the two sand shooting clamping bosses.

[0014] As preferred, the mobile trolley is an electric automatic trolley.

[0015] Compared with the prior art, the present application has the following advantages and effects: (1) the overall structure is reasonable and safe and reliable, the sand shooting and covering device in the present application can complete the sand shooting and covering molding operation of multiple large iron molds of different shapes and sizes in a large casting mold; (2) the sand shooting and covering molding of multiple large iron molds is carried out by the device, the process flow is smooth, the molding 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, reliable in operation and low in maintenance cost; (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

[0016] Figure 1 is a wind power main shaft casting structure schematic diagram of an embodiment of the present application Figure 1 .

[0017] Figure 2 is a wind power main shaft casting structure schematic diagram of an embodiment of the present application Figure 2 .

[0018] Figure 3 is a schematic diagram of the iron mold after closing of the present application.

[0019] Figure 4 is a schematic diagram of the structure of the through-type sand shooting and covering device.

[0020] Figure 5 is a schematic diagram of the main structure of the sand shooting and covering mechanism in the embodiment of the present application.

[0021] Figure 6 is a schematic diagram of the side structure of the sand shooting and covering mechanism in the embodiment of the present application.

[0022] Figure 7 is a schematic diagram of the top structure of the sand shooting and covering mechanism in the embodiment of the present application.

[0023] Figure 8 is a schematic diagram of the three-dimensional structure of the sand shooting and covering mechanism in the embodiment of the present application.

[0024] Figure 9 is a schematic diagram of the main structure of the moving trolley loading model / iron mold in the embodiment of the present application.

[0025] Figure 10 is a schematic diagram of the side structure of the moving trolley in the embodiment of the present application.

[0026] Figure 11 is a top view structural schematic diagram of the mobile trolley in the embodiment of the utility model.

[0027] Figure 12 is a three-dimensional structural schematic diagram of the mobile trolley in the embodiment of the utility model.

[0028] Figure 13 is a sand shooting and covering molding process schematic diagram in the embodiment of the utility model, in which the track platform, the sand shooting head is raised to position, and the iron mold / model / mobile trolley needing sand shooting and covering molding are arranged in sequence on one side.

[0029] Figure 14 is a molding process schematic diagram in the embodiment of the utility model, in which the iron mold / model / mobile trolley enters the sand shooting and covering station.

[0030] Figure 15 is a molding process schematic diagram in the embodiment of the utility model, in which the track platform is lowered, and the bottom surface of the mobile trolley is in contact with the sand shooting clamping boss.

[0031] Figure 16 is a molding process schematic diagram in the embodiment of the utility model, in which the track platform is continuously lowered, and the mobile trolley wheel is completely separated from the track platform track.

[0032] Figure 17 is a molding process schematic diagram in the embodiment of the utility model, in which the sand shooting head is lowered and the iron mold / model / mobile trolley is clamped, and then sand shooting and covering molding is performed.

[0033] Figure 18 is a molding process schematic diagram in the embodiment of the utility model, 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.

[0034] Figure 19 is a molding process schematic diagram in the embodiment of the utility model, in which the track platform is raised to position, and the mobile trolley is separated from the sand shooting clamping boss.

[0035] Figure 20 is a molding process schematic diagram in the embodiment of the utility model, in which the iron mold / model / mobile trolley after molding is completed leaves the sand shooting and covering station.

[0036] Figure 21 is a molding process schematic diagram in the embodiment of the utility model, in which the iron mold / model / mobile trolley after sand shooting and covering molding is arranged in sequence on the other side of the sand shooting and covering station.

[0037] 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;

[0038] 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;

[0039] Mobile trolley 3: trolley body 31, positioning structure 32, wheel 33, guide wheel 34. DETAILED DESCRIPTION

[0040] The utility model will be further explained in detail in combination with the drawings and by examples, and the following examples are the explanation of the utility model and the utility model is not limited to the following examples.

[0041] EXAMPLE

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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 column 1-2, and the base 1-1 are connected together to form a rigid frame structure.

[0046] The upper beam 1-3 is installed to bear all the sand coating and shooting device components, and a sand adding hopper 1-5 for containing sand coating and shooting sand is installed. Four telescopic sand adding pipes 1-12 are evenly arranged below the sand adding hopper 1-5, and the bottom of each telescopic sand adding pipe 1-12 is connected with a lower sand coating and shooting head 1-6 for uniformly conveying the sand coating contained in the sand adding hopper 1-5 into the shooting head cavity.

[0047] In the embodiment, 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 guide rods 1-8 are hollow rods, the top of the guide rods 1-8 is connected with the compressed air hose of the air tank 1-4, and the lower part of the guide rods 1-8 is fixed on the upper surface of the sand coating and shooting head 1-6. The guide rods 1-8 are used for guiding the up and down movement of the sand coating and shooting head 1-6, and at the same time, the compressed air required for sand shooting and coating of the iron mold is introduced from the air tank through the four hollow guide rods 1-8 arranged in a matrix, so that the sand coating in the sand shooting head 1-6 is uniformly shot into the gap between the large iron mold and the mold under the action of the compressed air, and the sand shooting and coating of the iron mold is completed.

[0048] In the 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 the mold / iron mold between the sand coating and shooting head 1-6 and the mold during the sand shooting and coating of the iron mold. The base 1-1 is a steel structure welded part, and two sand shooting 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 tons) generated by the mold / iron mold / movable trolley 3, sand shooting head 1-6, and sand shooting head lifting and clamping cylinder 1-7 during the sand shooting and coating process. Four track platform lifting hydraulic cylinders 1-10 are also fixed on the base 1-1 and are evenly arranged below the track platform 1-9, which are used for lifting the track platform 1-9.

[0049] In the embodiment, the upper end of the piston rod of each track platform lifting hydraulic cylinder 1-10 is connected with the track platform 1-9, and the lifting stroke 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.

[0050] 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, and the two through holes are used to pass through the two sand shooting clamping bosses 1-11 installed on the base 1-1.

[0051] In the 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, and the lower part of the trolley body 31 is provided with multiple wheels 33 and guide wheels 34.

[0052] Two tracks for moving the trolley 3 in and out of the sand shooting and sand coating device station are installed on the trolley track platform, for moving the trolley 3 in and out of the sand shooting and sand coating device.

[0053] The moving trolley 3 in this embodiment is an electric automatic trolley (attached Figure 5 ), and the power required for moving the trolley 3 can be supplied by a battery or a low-voltage device, and through the electrical control system 5, each moving trolley 3 can be automatically moved to each working station as required according to the requirements of the sand shooting and sand coating process of the iron mold.

[0054] In this embodiment, the working plane of the moving trolley 3 is installed with a positioning device between the model and the moving trolley 3, and some locking screw holes are set between the model and the trolley, which can be used for positioning and fixed locking between the model and the trolley; The lower plane of the moving trolley 3 is provided with a moving trolley clamping force structure, which is used to bear the clamping force of the sand shooting head lifting clamping hydraulic cylinder 1-7 (3-5 tons) of the sand shooting and sand coating equipment during sand shooting and sand coating molding, as well as the gravity of the sand shooting head, iron mold, model, and moving trolley 3, etc.

[0055] The sand shooting and sand coating of multiple different large iron molds in this application can be automatically / manually operated by the electrical control system 5.

[0056] Based on the structural characteristics and sand shooting and sand coating molding requirements of large iron molds, multiple model and iron mold trolleys are used, which are sequentially entered into the fixed iron mold sand shooting and sand coating device station, and sequentially complete the sand shooting and sand coating of multiple different iron molds.

[0057] The iron mold sand coated casting is used to cast large castings. Due to factors such as casting structure, size, mold removal requirements, and other casting process requirements, more than two large iron molds are often needed to combine to form the iron mold sand coated casting required for large castings, such as the wind power main shaft casting (as shown in Figure 1 ), and the iron mold sand coated casting forming its outer contour uses multiple different shape and size iron molds (generally 4 along the length direction of the main wind power main shaft axis, among which multiple are straight-through wind power main shaft outer circle castings, and one is a connecting flange through castings). For example Figure 2As shown, the iron type sand coated mold of the wind power main shaft is formed by coating a layer of coated sand on the inner cavity of each large iron type, and then stacking the corresponding iron type sand coated molds of the outer circle cavity of the wind power main shaft in sequence to form the iron type sand coated mold of the complete outer circle profile cavity of the wind power main shaft. The sand of the large iron type sand coated mold is still the hot curing phenolic resin coated sand with good fluidity, and the molding of the cavity of the iron type sand coated layer mold is performed in the traditional sand shooting and sand coating manner, that is, the coated sand is shot into the gap between the mold and the iron type under the action of compressed air to form a sand coating layer, and the sand coating layer is solidified, demolded and finally formed into the iron type sand coated mold under the action of heat. The key of the iron type sand shooting and sand coating device is to complete the sand shooting and sand coating operation of multiple different molds / iron types in one sand shooting and sand coating mechanism 1. It can be seen from Figure 3 that the through type sand shooting and sand coating molding equipment is composed of multiple model / iron type loading mobile trolleys 3, frame structure I, sand shooting and sand coating mechanism 1, track platform 1-9, track platform lifting hydraulic cylinder 1-10 and electrical control system 5.

[0058] The principle of the through type sand shooting and sand coating device of multiple large iron types in this embodiment is as follows: the weight of the large cast iron casting is generally 10-30 tons, the length in the appearance size of the casting is 4-6 meters, the width size is 2-4 meters, the height size is 2-4 meters, and the material of the casting is nodular cast iron, gray cast iron, etc. Due to the structure, size and casting process, etc., these castings are often difficult to form the casting mold required for casting production only by using two iron types. For example, the wind power main shaft casting, the product size of which is 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, 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 also different between ten tons and several dozen tons, and the weight of the model is also more than ten tons. When the iron type sand coated casting production is adopted for these castings, the casting mold is often formed by combining 4-5 iron types due to the product structure, size, casting process, etc. (see Figure 2). Traditional iron type sand coated casting sand coated sand molding device is often single station, double station sand coated molding machine, that is: each sand coated sand molding machine can complete a single iron type or two different iron type of different iron sand coated molding operation. If the sand coated sand molding of four or more different iron types is needed, multiple sand coated 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 sand coating often needs to be hundreds of tons, and the weight of only one large iron type sand shooting and sand coating station device is hundreds of tons or more. The cost of manufacturing the device is huge. If multiple traditional large sand coated molding equipment is used for the sand coated molding of such castings, only the investment in sand coated molding equipment is difficult to bear. Unlike the production of large quantities of small and medium-sized castings, the production efficiency of large castings is relatively low, and it often takes several hours to complete an iron type sand coated casting molding. Therefore, the sand shooting and sand coating molding equipment of the large iron type of the present application only uses one sand shooting and sand coating station, and the several models / iron types required for the iron type sand coated casting molding are installed on several moving trolleys 3. Each moving trolley 3 enters the sand shooting and sand coating station in turn, and each sand shooting and sand coating operation of the several iron types required for the iron type sand coated casting molding is completed in turn.

[0059] 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 completely leaving the sand shooting and covering device station, and completes the sand shooting and covering molding of the iron mold by the device; the above production operation process is sequentially circulated, so that the sand shooting and covering molding operation of all 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.

[0060] Through the above description, those skilled in the art can implement it.

[0061] In addition, it should be noted that the specific embodiments described in the specification, the shape of the parts, components, names taken, etc. can be different, the above described in the specification is only an example of the structure of the utility model. Any equivalent changes or simple changes made according to the structure, features and principles described in the utility model patent concept are included in the protection scope of the utility model patent. The skilled in the art of the utility model can make various modifications or supplements or adopt similar ways to replace the specific embodiments described, as long as it does not deviate from the structure of the utility model or beyond the scope defined in the claims, which shall belong to the protection scope of the utility model.

Claims

1. A through-type sand-shooting and sand-coating device for multiple large iron molds with different cavities, comprising a moving trolley entry and exit track (4) and multiple moving trolleys (3), wherein the multiple moving trolleys (3) are all arranged on the moving trolley entry and exit track (4), characterized in that: It also includes a sand-shooting and sand-coating mechanism (1), which includes a frame structure (Ⅰ), a sand-filling hopper (1-5), a sand-shooting head (1-6), an air tank (1-4), a track platform (1-9), four telescopic sand-filling pipes (1-12), multiple guide rods (1-8), two sand-shooting head lifting and clamping hydraulic cylinders (1-7), two sand-shooting clamping bosses (1-11), and four track platform lifting hydraulic cylinders (1-10). Four telescopic sand-filling pipes (1-12) are evenly arranged below the sand-filling hopper (1-5), and the bottom of each telescopic sand-filling pipe (1-12) It is connected to the sand-shooting head (1-6) below; the top of the guide rod (1-8) is connected to the compressed air of the air bag (1-4) through the air hose, and the lower part of the guide rod (1-8) is installed on the upper surface of the sand-shooting head (1-6); two sand-shooting head lifting and clamping hydraulic cylinders (1-7) are installed on the upper beam (1-3), two sand-shooting clamping bosses (1-11) are fixed on the upper surface of the base (1-1), and four track platform lifting hydraulic cylinders (1-10) are installed on the base (1-1). The four track platform lifting hydraulic cylinders (1-10) are evenly distributed below the track platform (1-9).

2. The through-type sand-shooting and sand-coating device for multiple large iron molds with different cavities according to claim 1, characterized in that: The mobile trolley (3) includes a body (31), a positioning structure (32), wheels (33) and guide wheels (34). Multiple positioning structures (32) are provided on the upper part of the body (31), and multiple wheels (33) and guide wheels (34) are provided on the lower part of the body (31).

3. The through-type sand-shooting and sand-coating device for multiple large iron molds with different cavities according to claim 1, characterized in that: The frame structure (Ⅰ) includes a base (1-1), an upper beam (1-3), and multiple columns (1-2). The upper beam (1-3) is installed on the multiple columns (1-2), and the multiple columns (1-2) are fixed on the base (1-1).

4. The through-type sand-shooting and sand-coating device for multiple large iron molds with different cavities according to claim 3, characterized in that: There are four columns (1-2), and all four columns (1-2) are fixed on the base (1-1).

5. The through-type sand-shooting and sand-coating device for multiple large iron molds with different cavities according to claim 1, characterized in that: There are four guide rods (1-8), which are arranged in a matrix above the shot head (1-6). All four guide rods are hollow.

6. The through-type sand-shooting and sand-coating device for multiple large iron molds with different cavities according to claim 1, characterized in that: The upper end of the piston rod of each track platform lifting hydraulic cylinder (1-10) is connected to the track platform (1-9), and the lifting stroke of the track platform lifting hydraulic cylinder (1-10) is 50 mm.

7. The through-type sand-shooting and sand-coating device for multiple large iron molds with different cavities according to claim 1, characterized in that: The track platform (1-9) is a steel structure welding platform. There are two rectangular through holes on the platform surface of the track platform (1-9). The two through holes are used to clamp the boss (1-11) through two sand-shooting clamps.

8. The through-type sand-shooting and sand-coating device for multiple large iron molds with different cavities according to claim 1 or 2, characterized in that: The mobile trolley (3) is an electric automatic trolley.

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