Pass-type sand shooting and coating device for multiple large iron molds with different cavities and molding production method of pass-type sand shooting and coating device

Abstract

The invention relates to a through-type sand shooting and coating device for a plurality of large iron molds with different cavities and a molding production method of the through-type sand shooting and coating device, and belongs to the field of machinery. The device comprises a sand shooting and coating mechanism, a moving trolley in-out track and a plurality of moving trolleys, and the moving trolleys are all 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 iron mold sand-lined casting mold quality, high in mechanization degree and convenient to install, and meets the use requirements.

Description

Technical Field

[0001] The present invention relates to an equipment and a method thereof, and in particular to a through-type sand-shooting and sand-covering device for a plurality of large iron molds with different cavities (hereinafter referred to as the plurality of different large iron molds) and a molding production method thereof, which belongs to the field of casting production in the machinery category. Background Art

[0002] Iron mold sand casting belongs to the category of special casting. Its casting production has the advantages of being green, high-quality, energy-saving, environmentally friendly, and low-cost. It has been increasingly used, mainly in the casting production of large quantities of small and medium-sized castings.

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

[0004] It is difficult to meet the requirements of internal structure, performance, precision, etc. for such castings using traditional sand casting production methods, and castings have become the key bottleneck for the improvement of such equipment. Iron mold sand-coated castings are gradually being used in the production of these castings due to their unique characteristics of rapid cooling, extremely high mold rigidity, dense and smooth mold surface, and the shrinkage compensation effect of graphitization expansion during cast iron solidification. The molds of these castings often require a combination of multiple molds, and the size and weight of the molds are very large. The existing single-station and double-station iron mold sand-coated casting sand-coated equipment is difficult to meet the sand-coated molding needs of these large iron mold sand-coated castings.

[0005] A Chinese patent with a publication date of October 22, 221 and a publication number of CN214442875U discloses a utility model patent named "a horizontally movable double-station iron mold sand-covered molding machine". The patent includes a bottom plate, a top plate and a column. Two sets of lifting mechanisms are passed 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. Two sets of sand shooting mechanisms are provided on the top plate. The sand shooting mechanism includes a gas storage tank and a sand bucket fixed on the top surface of the top plate, and a sand cylinder and a shooting head component located on the bottom surface of the top plate, wherein the sand cylinder and the shooting head component are fixedly connected. Although the patent installs a sand box on the sand box holding table, in the process of using the sand box to inject molding sand into the molding mold, the sand bucket can be used to inject molding sand into the sand box at the same time, thereby realizing the simultaneous sand covering and molding, and improving production efficiency, but it cannot meet the sand shooting and molding requirements of the large iron mold sand-covered casting described above, so it still has defects.

[0006] Therefore, developing an economically feasible device for sequentially performing sand-shooting and sand-covering molding on multiple large iron molds has become one of the keys to achieving the production of such castings by iron mold sand-covering casting. Summary of the invention

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

[0008] The technical solution adopted by the present invention to solve the above-mentioned problem is: the through-type sand-shooting and sand-covering device for multiple large iron molds with different cavities includes a mobile trolley inlet and outlet track and multiple mobile trolleys loaded with different models and iron molds, and the multiple mobile trolleys are all arranged on the mobile trolley inlet and outlet track. The mobile trolley includes a body, a positioning structure, wheels and guide wheels. The upper part of the body is provided with multiple positioning structures, and the lower part of the body is provided with multiple wheels and guide wheels. It is characterized in that it also includes a sand-shooting and sand-covering mechanism and a fixed sand-shooting and sand-covering station. The fixed sand-shooting and sand-covering station is a sand-shooting and sand-covering mechanism for large iron molds. The sand-shooting and sand-covering mechanism includes a frame structure, a sand-adding bucket, a sand-shooting head, an air bag, a track platform, four telescopic sand-adding pipes, There are 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 includes a base, an upper beam and multiple columns. The upper beam is installed on multiple columns, and the multiple columns are fixed on the base; four telescopic sand-feeding pipes are evenly arranged below the sand-feeding hopper, and the bottom of each telescopic sand-feeding pipe is connected to the sand-shooting head below; the top of the guide rod is connected to the compressed air of the air bag through an air hose, and the lower part of the guide rod is installed on the upper plane 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 plane of the base, and 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] Preferably, the working plane on the mobile trolley of the present invention is equipped with a positioning device between the model and the trolley, and a number of locking screw holes between the model and the trolley are provided, which can be used for positioning and fixing and locking the model and the trolley.

[0010] Preferably, the lower plane of the mobile trolley described in the present invention is provided with a mobile trolley clamping force structure; it is used to withstand the clamping force (3-5 hundred tons) of the sand shooting head lifting and clamping hydraulic cylinder of the sand shooting equipment when performing sand shooting and sand covering molding, as well as the gravity of the sand shooting head, iron mold, model, mobile trolley, etc.

[0011] Preferably, the number of guide rods in the present invention is four, and the four guide rods are distributed above the sand-shooting head in a matrix manner, and all of the four guide rods are hollow guide rods.

[0012] Preferably, the guide rod of the present invention is used for guiding when the sand shooting head rises or falls, and is also used to evenly introduce the compressed air required for sand shooting and sand covering molding of the iron mold from the air storage bag through four hollow guide rods distributed in a matrix manner into the sand shooting head cavity, so that the coated sand in the sand shooting head is evenly injected and filled into the gap between the large iron mold and the model under the action of compressed air, thereby completing the sand shooting and sand covering molding of the iron mold.

[0013] Preferably, the mobile trolley of the present invention 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] Preferably, the upper end of the piston rod of each track platform lifting hydraulic cylinder described in the present invention is connected to the track platform, and the lifting stroke of the track platform lifting hydraulic cylinder is 50 mm. As the four track platform lifting hydraulic cylinders rise and fall, the track platform can be driven to rise and fall.

[0015] Preferably, the frame structure of the present invention is a rigid structure formed by connecting an upper beam, a column and a base together.

[0016] The present invention also provides a molding production method of a through-type sand shooting and sand coating device for multiple large iron molds with different cavities, which is characterized by: the specific steps are as follows: all the assembled models / iron molds / moving trolleys that need to be sand shot and sand coated are arranged in sequence on the moving trolley entry and exit track outside one side of the through-type sand shooting and sand coating device station; the two sand shooting head lifting and clamping hydraulic cylinder piston rods in the sand shooting and sand coating mechanism rise to the highest position, driving the sand shooting head to rise to the highest position; the piston rods of the four track platform lifting hydraulic cylinders rise to the highest position, the track platform rises to the highest position, and the upper plane of the moving trolley entry and exit track is highly consistent with the upper plane of the track outside the station of the sand shooting and sand coating device; the model / iron mold / moving trolley that is ranked first automatically enters and exits the station, and the sand shooting head is automatically lifted and lowered. The injection sand and sand covering device stops at the working position, and the piston rods of the four track platform lifting hydraulic cylinders gradually descend, driving the track platform and the mobile trolley to descend together. When the lower plane of the mobile trolley contacts the upper plane of the sand shooting clamping boss, the mobile trolley no longer descends, and the piston rods of the four track platform lifting hydraulic cylinders continue to descend, driving the track platform to continue to descend. When the track platform descends to the lowest position, the wheels of the mobile trolley are completely separated from the tracks on the track platform, and the wheels of the mobile trolley are no longer under force. The entire weight of the mobile trolley / iron mold / model is borne on the sand shooting clamping boss; the piston rods of the two sand shooting head lifting and clamping hydraulic cylinders in the sand shooting and sand covering mechanism descend, driving the sand shooting head to descend. When the lower plane of the sand shooting head contacts the upper plane of the iron mold, the sand shooting The head lifting and clamping hydraulic cylinder no longer descends, and the clamping force generated by the sand shooting head lifting and clamping hydraulic cylinder tightly clamps the sand shooting head, iron mold, model, and mobile trolley together; open the air valve of the air bag, and the compressed air in the air bag enters the sand shooting head cavity through the hollow guide rod, and injects the coated sand in the sand shooting head into the gap between the model and the iron mold cavity. After the sand shooting and sand coating modeling is completed, the remaining compressed air in the sand shooting head cavity is discharged to the atmosphere through the exhaust valve set on the sand shooting head; raise the piston of the sand shooting head lifting and clamping hydraulic cylinder to the highest position, and the lower plane of the sand shooting head is completely separated from the upper plane of the iron mold, thereby releasing the clamping force between the sand shooting head, model, iron mold, and mobile trolley; raise the four track platform lifting hydraulic cylinders of the track platform The piston rod drives the track platform to rise, the wheels of the mobile trolley contact the entry and exit tracks of the mobile trolley, the sand shooting clamping boss disengages from the bottom surface of the mobile trolley, and when the upper plane of the track on the mobile trolley platform is at the same height as the upper plane of the outer track, the pistons of the four track platform lifting hydraulic cylinders reach the highest position; the mobile trolley automatically moves to the track on the other side outside the station of the sand shooting and sand covering device until it completely leaves the station of the sand shooting and sand covering device, completing the sand shooting and sand covering molding of the iron mold by the device of this application; the above-mentioned production operation process is repeated in sequence to complete the sand shooting and sand covering molding operation of all different large iron molds on one side of the sand shooting and sand covering device, and the iron molds / models / mobile trolleys after the operation are all moved to the other side of the sand shooting and sand covering station in sequence.

[0017] Compared with the prior art, the present invention has the following advantages and effects: (1) The overall structure is reasonably designed, safe and reliable. Through a sand shooting and sand covering device in the present application, the sand shooting and sand covering casting molding operations of multiple large iron molds of different shapes and sizes in large casting molds can be completed; (2) The device of the present application is used to perform sand shooting and sand covering molding of multiple different large iron molds, the process flow is smooth, the molding process of the iron mold sand covering casting is highly mechanized, the labor intensity is low, the sand shooting and sand covering process is easy to realize automatic control, and the quality of large iron mold sand covering casting is good; (3) The large iron mold sand shooting and sand covering device of the present application has low investment cost, easy equipment installation, reliable operation and low maintenance cost; (4) Combined with other supporting devices, a large iron mold sand covering casting molding line can be formed to realize the mechanized production of large iron mold sand covering castings, thereby realizing the mass production of large iron mold sand covering castings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The structure of the wind turbine main shaft casting according to the embodiment of the present invention is shown in FIG. Figure 1 .

[0019] Figure 2 The structure of the wind turbine main shaft casting according to the embodiment of the present invention is shown in FIG. Figure 2 .

[0020] Figure 3 It is a schematic diagram of the iron mold after assembly for casting a wind turbine main shaft according to an embodiment of the present invention.

[0021] Figure 4 It is a schematic structural diagram of a through-type sand-shooting and sand-covering device according to an embodiment of the present invention.

[0022] Figure 5 It is a schematic diagram of the main structure of the sand shooting and covering mechanism in an embodiment of the present invention.

[0023] Figure 6 It is a side structural schematic diagram of the sand shooting and covering mechanism in an embodiment of the present invention.

[0024] Figure 7 1 is a schematic diagram of the top view of the sand shooting and covering mechanism in an embodiment of the present invention.

[0025] Figure 8 It is a schematic diagram of the three-dimensional structure of the sand shooting and sand covering mechanism in an embodiment of the present invention.

[0026] Fig. 9 It is a schematic diagram of the main structure of a mobile trolley for loading models / iron molds in an embodiment of the present invention.

[0027] Fig.10 It is a side structural schematic diagram of the moving trolley in an embodiment of the present invention.

[0028] Fig.11It is a schematic diagram of the top structure of the moving trolley in the embodiment of the present invention.

[0029] Fig.12 It is a three-dimensional structural schematic diagram of a moving trolley in an embodiment of the present invention.

[0030] Fig.13 It is a schematic diagram of the sand shooting and sand covering molding process in which a track platform, a sand shooting head rises into place, and an iron mold / model / mobile trolley that needs sand shooting and sand covering molding are arranged in sequence on one side in an embodiment of the present invention.

[0031] Fig.14 It is a schematic diagram of the molding process in which the iron mold / model / mobile trolley enters the sand shooting and sand coating station in an embodiment of the present invention.

[0032] Fig.15 It is a schematic diagram of the molding process in which the track platform descends and the bottom surface of the mobile trolley contacts the sand-shooting clamping boss in an embodiment of the present invention.

[0033] Fig.16 It is a schematic diagram of the molding process in which the track platform continues to descend and the moving platform wheels are completely separated from the track of the track platform in an embodiment of the present invention.

[0034] Fig.17 It is a schematic diagram of the molding process in which the sand blasting head descends and the iron mold / model / movable trolley is clamped to perform sand blasting and sand covering molding in an embodiment of the present invention.

[0035] Fig.18 It is a schematic diagram of the molding process in which the sand-shooting and sand-covering molding is completed, the sand-shooting head rises to the top and the iron mold is completely released from clamping in an embodiment of the present invention.

[0036] Fig.19 It is a schematic diagram of the molding process in which the track platform rises to its position and the mobile trolley is separated from the sand-shooting clamping boss in an embodiment of the present invention.

[0037] Fig. 20 It is a schematic diagram of the shaping process after the finished iron mold / model / mobile trolley leaves the sand shooting and sand coating station in an embodiment of the present invention.

[0038] Fig.21 It is a schematic diagram of the molding process in which the iron mold / model / mobile trolley for completing the sand shooting and sand covering molding in an embodiment of the present invention is arranged in sequence on the other side of the sand shooting and sand covering station.

[0039] In the figure: frame structure I, sand blasting and sand covering mechanism 1, fixed sand blasting and sand covering station 2, mobile trolley 3, mobile trolley entry and exit track 4, electrical control system 5; lifting stroke H; Sand shooting and sand covering mechanism 1: base 1-1, column 1-2, upper beam 1-3, air bag 1-4, sand adding bucket 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; The mobile trolley 3 includes a body 31 , a positioning structure 32 , wheels 33 , and guide wheels 34 . DETAILED DESCRIPTION

[0040] The present invention will be further described in detail below with reference to the accompanying drawings and by way of examples. The following examples are intended to explain the present invention but the present invention is not limited to the following examples.

[0041] Example

[0042] See also Figures 1 to 21 In this embodiment, the through-type sand shooting and sand covering device for multiple large iron molds with different cavities includes a sand shooting and sand covering mechanism 1 and a fixed sand shooting and sand covering station 2, a mobile trolley entry and exit 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 all arranged on the mobile trolley entry and exit track 4, and the fixed sand shooting and sand covering station 2 is the sand shooting and sand covering mechanism 1 for large iron molds.

[0043] The sand-shooting and sand-covering mechanism 1 in this embodiment includes 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, a plurality of guide rods 1-8, a track platform 1-9, four track platform lifting and clamping 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 this embodiment includes a base 1-1, an upper beam 1-3 and a plurality of columns 1-2. The upper beam 1-3 is installed on the plurality of columns 1-2, and the plurality of 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 four columns 1-2, the four columns 1-2 are installed on the base 1-1, and the upper beam 1-3, the columns 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 support all the components of the sand covering and sand shooting device, and is installed with a sand adding hopper 1-5 for containing the coating sand for the sand covering and sand shooting. 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 to the sand covering and sand shooting head 1-6 below, so as to evenly transport the coating sand contained in the sand adding hopper 1-5 into the sand shooting head cavity.

[0047] In this embodiment, the four sand shooting heads 1-6 move up and down to guide the guide rods 1-8 distributed 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 ventilation hose of the air bag 1-4, and the lower part of the guide rods 1-8 is fixed on the upper plane of the sand covering sand shooting head 1-6. The guide rods 1-8 are used for guiding when the sand covering sand shooting head 1-6 rises or falls, and are also used to introduce the compressed air required for sand shooting and sand covering modeling of the iron mold from the air storage air bag through the four hollow guide rods 1-8 distributed in a matrix into the sand covering sand shooting head cavity, so that the coated sand in the sand shooting head 1-6 is evenly shot into and filled into the gap between the large iron mold and the model under the action of compressed air, thereby completing the sand shooting and sand covering modeling of the iron mold.

[0048] 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 to clamp the sand-covering sand-shooting head 1-6 and the model / iron mold during the sand-shooting and sand-covering molding operation. The base 1-1 is a steel structure welded part, and two sand-shooting clamping bosses 1-11 are installed on the plane of the base 1-1 to bear the force (generally more than 300-500 tons) generated by the model / iron mold / mobile trolley 3, the sand-shooting head 1-6, and the sand-shooting head lifting and clamping cylinder 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, which are evenly distributed below the track platform 1-9 and are used for lifting and lowering the track platform 1-9.

[0049] 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, and the lifting stroke H of the track platform lifting hydraulic cylinder 1-10 is 50 mm. As the four track platform lifting hydraulic cylinders 1-10 are lifted or lowered, the track platform 1-9 can be driven to lift or lower.

[0050] The track platform 1-9 is a steel structure welding platform, and can also be made into a casting structure. There are two rectangular through holes on the table top of the track platform 1-9, and the two through holes are used to pass through two sand-shooting clamping bosses 1-11 installed on the base 1-1.

[0051] In this embodiment, the mobile trolley 3 includes a body 31 , a positioning structure 32 , wheels 33 and guide wheels 34 . A plurality of positioning structures 32 are disposed on the upper portion of the body 31 , and a plurality of wheels 33 and guide wheels 34 are disposed on the lower portion of the body 31 .

[0052] Two rails for moving the trolley 3 in and out of the sand-blasting and sand-covering device are installed on the trolley rail platform and are used for moving the trolley 3 in and out of the sand-blasting and sand-covering device.

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

[0054] In this embodiment, a positioning device between the model and the mobile trolley 3 is installed on the working plane of the mobile trolley 3, and some locking screw holes are set between the model and the mobile trolley 3, which can be used for positioning and fixing and locking the model and the mobile trolley 3; a mobile trolley clamping force structure is provided on the lower plane of the mobile trolley 3, which is used to withstand the clamping force (300-500 tons) of the sand shooting head lifting and clamping hydraulic cylinder 1-7 of the sand shooting and sand covering equipment when performing sand shooting and sand covering modeling, as well as the gravity of the sand shooting head, iron mold, model, and mobile trolley 3. The sand-shooting and sand-covering operations of multiple different large iron molds in the present application can realize automatic / manual operation of the sand-shooting and sand-covering molding of multiple different iron molds through the electrical control system 5.

[0055] Based on the structural characteristics of large iron molds and the needs of sand shooting and sand covering molding, this embodiment uses multiple small carts loaded with different models and iron molds to enter the fixed iron mold sand shooting and sand covering device stations in turn to complete the sand shooting and sand covering operations of multiple different iron mold castings in turn.

[0056] When using iron molds covered with sand to cast large castings, due to factors such as casting structure, size, demoulding requirements, and other casting process requirements, more than two large iron molds are often required to combine and form the iron mold covered with sand required for large castings, such as wind turbine main shaft castings ( Figure 1 ), the iron mold with sand casting to form its outer contour uses multiple iron molds of different shapes and sizes (generally 4 pieces along the length direction of the main wind turbine main shaft axis, of which many are straight-through wind turbine main shaft outer circular castings, and 1 is a connecting flange through-type casting). Figure 2 As shown, the wind turbine main shaft iron mold sand-coated casting is achieved by coating the inner cavity of each large iron mold with a layer of coated sand, and then stacking the corresponding wind turbine main shaft outer cylindrical cavity iron mold sand-coated casting molds in sequence to form a complete wind turbine main shaft outer cylindrical contour cavity iron mold-coated sand casting mold. The molding sand of the large iron mold sand-coated casting mold is still made of thermosetting phenolic resin coated sand with good fluidity. The molding of the iron mold sand-coated layer casting cavity adopts the traditional sand shooting and sand coating method, that is: under the action of compressed air, the coated sand is shot into the gap between the model and the iron mold to form a sand coating layer. Under the action of heat, the sand coating layer is solidified, demolded, and finally an iron mold sand-coated casting mold is formed. The key to the iron mold sand shooting and sand coating device is to complete the sand shooting and sand coating operations of multiple different models / iron molds in one sand shooting and sand coating mechanism 1. From Figure 3It can be seen that the through-type sand shooting and sand covering molding equipment is composed of multiple mobile trolleys 3 for loading models / iron molds, a frame structure I, a sand shooting and sand covering mechanism 1, a track platform 1-9, a track platform lifting hydraulic cylinder 1-10 and an electrical control system 5.

[0057] The principle of the through-type sand-shooting and sand-covering device of the present embodiment of multiple large iron molds is as follows: the weight of large cast iron castings is generally 10-30 tons, the length of the castings is 4-6 meters, the width is 2-4 meters, and the height is 2-4 meters. The materials of the castings include ductile iron, gray cast iron, etc. Due to the structure, size, and casting process of these castings, it is often difficult to use only two iron molds to form the castings required for casting production. For example: the wind turbine main shaft casting, its product dimensions: the length is generally 4-6 meters, the connecting flange diameter is 2.8-3.5 meters, and the main shaft neck outer diameter is between 1.5-2.0 meters, which belongs to large ductile iron castings. The largest projection diameter of these large iron molds is about 5-6 meters, the height is about 1 meter, the weight of each iron mold is also between ten tons and dozens of tons, and the weight of the model is also more than ten tons. When this type of casting is produced by iron mold sand casting, the mold often needs to be combined with 4-5 iron molds to form a complete mold due to its product structure, size, casting process and other factors (see Figure 2 ). Traditional iron mold sand-covered casting sand-shooting and sand-covering molding devices are often single-station or double-station sand-covering molding machines, that is, each sand-shooting and sand-covering molding machine can complete different iron sand-covering molding operations for a single iron mold or two different iron molds. If four or more different iron molds need to be sand-covered, multiple sand-covering molding devices are required. For large iron molds with extremely large sizes and weights, sand-covering operations are performed on them. The clamping force between the model / iron mold / sand-shooting plate during sand-covering often requires hundreds of tons. The weight of just one large iron mold sand-shooting and sand-covering station device is more than hundreds of tons, and the manufacturing cost of the device is huge. If multiple traditional extra-large sand-covering molding equipment are used to perform sand-covering molding of such casting iron molds, the investment in sand-covering molding equipment alone is unbearable. Unlike the iron mold sand-covering casting production of large quantities of small and medium-sized castings, the production efficiency of iron mold sand-covering casting of large castings is relatively low, and it is often only necessary to complete the molding of an iron mold sand-covering casting in a few hours. To this end, the sand shooting and sand covering molding equipment for large iron molds of the present application only adopts one sand shooting and sand covering station, and several models / iron molds required for an iron mold sand covering casting are installed on several mobile trolleys 3, and each mobile trolley 3 enters the sand shooting and sand covering station of the present application in turn, and completes the sand shooting and sand covering operations of several iron molds required for an iron mold sand covering casting one by one.

[0058] The molding production process of the through-type sand shooting and sand coating device for multiple large iron molds with different cavities is as follows: all the assembled models / iron molds / moving trolleys 3 that need to be sand shot and sand coated are arranged in sequence on the moving trolley inlet and outlet track 4 outside one side of the through-type sand shooting and sand 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 in the sand shooting and sand coating mechanism 1 rise to the highest position, driving the sand shooting head 1-6 to rise to the highest position; the piston rods of the four track platform lifting hydraulic cylinders 1-10 installed on the base 1-1 rise to the highest position, and the track platform 1-9 rises to the highest position, and the upper plane of the moving trolley inlet and outlet track 4 is consistent in height with the upper plane of the track outside the station of the sand shooting and sand coating device; ranked first The model / iron mold / mobile trolley 3 automatically enters the sand-shooting and sand-coating device station and stops. The piston rods of the four track platform lifting hydraulic cylinders 1-10 gradually descend, driving the track platform 1-9 and the mobile trolley 3 to descend together. When the lower plane of the mobile trolley 3 contacts the upper plane of the sand-shooting clamping boss 1-11 fixedly set on the base 1-1, the mobile trolley 3 no longer descends, and 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 hydraulic cylinder stroke is about 50 mm), the wheels 33 of the mobile trolley 3 are completely separated from the track on the track platform 1-9, and the wheels 33 of the mobile trolley 3 are no longer under force, and the mobile trolley 3 / iron mold / model All weight is borne on the sand-shooting clamping boss 1-11; the piston rods of the two sand-shooting head lifting and clamping hydraulic cylinders 1-7 in the sand-shooting and sand-covering mechanism 1 descend, driving the sand-shooting head 1-6 to descend. When the lower plane of the sand-shooting head 1-6 contacts the upper plane of the iron mold, the sand-shooting head lifting and clamping hydraulic cylinders 1-7 no longer descend, and the clamping force generated by the sand-shooting head lifting and clamping hydraulic cylinders 1-7 tightly clamps the sand-shooting head 1-6, the iron mold, the model, the mobile trolley 3, etc. together; open the vent valve of the air bag 1-4, and the compressed air in the air bag 1-4 enters the sand-shooting head 1-6 cavity through the hollow guide rod 1-8, and injects the coated sand in the sand-shooting head 1-6 into the gap between the model and the iron mold cavity. The sand-shooting and sand-covering molding is completed, and the sand-shooting and sand-covering molding is completed by setting the sand-shooting head 1 -6 exhausts the remaining compressed air in the cavity of the sand-shooting head 1-6 into the atmosphere; the piston of the sand-shooting head lifting and clamping hydraulic cylinder 1-7 is raised to the highest position, and the lower plane of the sand-shooting head 1-6 is completely separated from the upper plane of the iron mold, thereby releasing the clamping force between the sand-shooting head 1-6, the model, the iron mold, and the mobile trolley 3; the piston rods of the four track platform lifting hydraulic cylinders 1-10 of the track platform 1-9 are raised to drive the track platform 1-9 to rise, and the wheels 33 of the mobile trolley 3 are in contact with the mobile trolley inlet and outlet track 4, and the sand-shooting clamping boss 1-11 is separated from the bottom surface of the mobile trolley 3. When the upper plane of the track on the mobile trolley 3 platform is consistent in height with the upper plane 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 station of the sand-shooting and sand-covering device until it completely leaves the station of the sand-shooting and sand-covering device, completing the sand-shooting and sand-covering molding of the iron mold by the device of the present invention; the above production operation process is cycled in sequence to complete the sand-shooting and sand-covering molding operation of all different large iron molds on one side of the sand-shooting and sand-covering device, and after the operation is completed, the iron mold / model / mobile trolley 3 is all moved to the other side of the sand-shooting and sand-covering station in sequence. ;

[0059] Through the above description, those skilled in the art can already implement it.

[0060] In addition, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may be different, and the above content described in this specification is only an example of the structure of the present invention. All equivalent changes or simple changes made based on the structure, features and principles described in the patent concept of the present invention are included in the protection scope of the patent of the present invention. Technicians in the technical field to which the present invention belongs can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A through-type sand-shooting and sand-coating device for a plurality of large iron molds with different cavities, comprising a mobile trolley inlet and outlet track (4) and a plurality of mobile trolleys (3) loaded with different models and iron molds, wherein the plurality of mobile trolleys (3) are all arranged on the mobile trolley inlet and outlet track (4), the mobile trolley (3) comprises a body (31), a positioning structure (32), wheels (33) and guide wheels (34), the upper part of the body (31) is provided with a plurality of positioning structures (32), the lower part of the body (31) is provided with a plurality of wheels (33) and guide wheels (34), characterized in that: The invention also comprises a sand-shooting and sand-covering mechanism (1) and a fixed sand-shooting and sand-covering station (2). The fixed sand-shooting and sand-covering station (2) is a large iron-type sand-shooting and sand-covering mechanism (1). The sand-shooting and sand-covering mechanism (1) comprises a frame structure (I), a sand-adding bucket (1-5), a sand-shooting head (1-6), an air bag (1-4), a track platform (1-9), four telescopic sand-adding pipes (1-12), a plurality of 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 and clamping hydraulic cylinders (1-10). The frame structure (I) comprises a base (1-1), an upper beam (1-3) and a plurality of columns (1-2). The upper beam (1-3) is installed on the plurality of columns (1-2). The plurality of columns (1-2 ) is fixed on the base (1-1); four telescopic sand-feeding pipes (1-12) are evenly arranged below the sand-feeding hopper (1-5), and the bottom of each telescopic sand-feeding pipe (1-12) 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 an air hose, and the lower part of the guide rod (1-8) is installed on the upper plane 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 plane of the base (1-1), and four track platform lifting hydraulic cylinders (1-10) are installed on the base (1-1), and 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-covering device for multiple large iron molds with different cavities according to claim 1 is characterized in that: A positioning device between the model and the trolley is installed on the working plane of the mobile trolley (3), and a number of locking screw holes between the model and the mobile trolley (3) are arranged, which can be used for positioning and fixing and locking the model and the mobile trolley (3).

3. The through-type sand-shooting and sand-covering device for multiple large iron molds with different cavities according to claim 1 or 2, characterized in that: The lower plane of the movable trolley (3) is provided with a movable trolley clamping force-bearing structure.

4. The through-type sand-shooting and sand-covering device for multiple large iron molds with different cavities according to claim 1 is characterized in that: There are four guide rods (1-8), which are distributed in a matrix above the sandblasting head (1-6), and all of the four guide rods are hollow guide rods (1-8).

5. The through-type sand-shooting and sand-covering device for multiple large iron molds with different cavities according to claim 4 is characterized in that: The guide rods (1-8) are used for guiding the sand shooting head (1-6) when it rises or falls, and are also used for uniformly introducing the compressed air required for sand shooting and sand covering molding of the iron mold from the air storage bag through four hollow guide rods (1-8) distributed in a matrix pattern into the mold cavity of the sand shooting head (1-6), so that the coated sand in the sand shooting head (1-6) is uniformly injected and filled into the gap between the large iron mold and the model under the action of the compressed air, thereby completing the sand shooting and sand covering molding of the iron mold.

6. The through-type sand-shooting and sand-covering 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, 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-type sand-shooting and sand-covering device for multiple large iron molds with different cavities according to claim 1 is 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); the lifting stroke of the track platform lifting hydraulic cylinder (1-10) is 50 millimeters; as the four track platform lifting hydraulic cylinders (1-10) are lifted or lowered, the track platform (1-9) can be driven to lift or lower.

8. The through-type sand-shooting and sand-covering device for multiple large iron molds with different cavities according to claim 1 is characterized in that: The frame structure (I) is a rigid structure formed by connecting an upper beam (1-3), a column (1-2) and a base (1-1) together.

9. A molding production method of a plurality of large iron molds with different cavities by a through-type sand-shooting and sand-covering device, using the through-type sand-shooting and sand-covering device for a plurality of large iron molds with different cavities as claimed in any one of claims 1 to 8, characterized in that: The specific steps are as follows: all the assembled models / iron molds / mobile trolleys (3) that need to be sandblasted and coated are arranged in sequence on the mobile trolley entry and exit track (4) outside one side of the through-type sandblasting and coating device station; the piston rods of the two sandblasting head lifting and clamping hydraulic cylinders (1-7) in the sandblasting and coating mechanism (1) rise to the highest position, driving the sandblasting head (1-6) to rise to the highest position; the piston rods of the four track platform lifting hydraulic cylinders (1-10) rise to the highest position, and the track platform (1-9) rises to the highest position, and the upper plane of the mobile trolley entry and exit track (4) is consistent in height with the upper plane of the track outside the sandblasting and coating device station; the model / iron mold / mobile trolley (3) in the first position automatically enters the sandblasting and coating device station position and stops, and the four track platforms The piston rod of the lifting hydraulic cylinder (1-10) gradually descends, driving the track platform (1-9) and the mobile trolley (3) to descend together. When the lower plane of the mobile trolley (3) contacts the upper plane of the sand-shooting clamping boss (1-11), the mobile trolley (3) stops descending, and 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 mobile trolley (3) are completely separated from the tracks on the track platform (1-9), and the wheels (33) of the mobile trolley (3) are no longer subjected to force. The entire weight of the mobile trolley (3) / iron mold / model is borne on the sand-shooting clamping boss (1-11); the two sand-shooting heads in the sand-shooting and sand-covering mechanism (1) are lifted. The piston rod of the lowering clamping hydraulic cylinder (1-7) descends, driving the sand-shooting head (1-6) to descend. When the lower plane of the sand-shooting head (1-6) contacts the upper plane of the iron mold, the sand-shooting head lifting and clamping hydraulic cylinder (1-7) stops descending. 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 iron mold, the model, and the mobile trolley (3) together. The air valve of the air bag (1-4) is opened, and the compressed air in the air bag (1-4) enters the cavity of the sand-shooting head (1-6) through the hollow guide rod (1-8), injecting the coated sand in the sand-shooting head (1-6) into the gap between the model and the cavity of the iron mold. After the sand-shooting and sand-coating molding is completed, the remaining sand in the cavity of the sand-shooting head (1-6) is exhausted through the exhaust valve arranged on the sand-shooting head (1-6). The remaining compressed air is discharged into the atmosphere; the piston of the sand-shooting head lifting and clamping hydraulic cylinder (1-7) is raised to the highest position, and the lower plane of the sand-shooting head (1-6) is completely separated from the upper plane of the iron mold, thereby releasing the clamping force between the sand-shooting head (1-6), the model, the iron mold, and the mobile trolley (3); the piston rods of the four track platform lifting hydraulic cylinders (1-10) of the track platform (1-9) are raised to drive the track platform (1-9) to rise, and the wheels (33) of the mobile trolley (3) contact the mobile trolley inlet and outlet tracks (4), and the sand-shooting clamping boss (1-11) is separated from the bottom surface of the mobile trolley (3). When the upper plane of the track on the mobile trolley (3) platform is at the same height as the upper plane 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 track on the other side outside the sand-shooting and sand-covering device station until it completely leaves the sand-shooting and sand-covering device station, completing the sand-shooting and sand-covering molding of the iron mold by the device of the present application; the above production operation process is cycled in sequence to complete the sand-shooting and sand-covering molding operation of all different large iron molds on one side of the sand-shooting and sand-covering device, and after the operation is completed, the iron mold / model / mobile trolley (3) is all moved in sequence to the other side of the sand-shooting and sand-covering station. ;

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