A four-template coated sand molding machine device and its working method

Abstract

The present invention relates to a four-template sand-coated molding machine device and its working method, which belongs to the machinery category. The sand-coated molding machine device of the present invention includes a sand shooting and sand coating mechanism, a mold clamping and mold lifting mechanism, a template shuttling mechanism, a sand shooting head shuttling mechanism, an iron mold conveying roller path, an upper beam, columns, a sand hopper, an air bag and a base. The upper beam is connected to the base through the columns. The sand hopper and the air bag are arranged on the upper beam. The iron mold conveying roller path is installed on the columns. The sand shooting and sand coating mechanism is fixed on the upper beam. The sand shooting head shuttling mechanism is matched with the sand shooting and sand coating mechanism. Two shuttling and movable sand shooting heads are arranged on each sand shooting head shuttling mechanism. The lifting cylinders of the two mold clamping and mold lifting mechanisms are fixed on the base. The template shuttling mechanism is fixedly installed on the base. The present invention also provides a working method of a four-template sand-coated molding machine. The structure of the present invention is designed simply and reasonably, safe and reliable, convenient for installation, disassembly and maintenance, small in occupied space, reducing the input cost of the production line, and meeting the use requirements.

Description

Technical Field

[0001] The present invention relates to a device and a method, in particular to a sand-covered molding machine device with four templates and its working method, and it belongs to the field of machinery. Background Art

[0002] Iron mold sand-covered casting belongs to special casting, and its mold is formed by covering a thin layer of coated sand on the inner cavity of the metal mold. Iron mold sand-covered casting has the characteristics of energy saving, material saving, high efficiency, high quality, and green production, and its application fields are becoming wider and wider. The cavity of the iron mold sand-covered mold is generally completed by a sand-covered molding machine for the sand-covered molding of the iron mold.

[0003] Common sand-covered molding machines include single-station sand-covered molding machines, double-station sand-covered molding machines, etc. Iron mold sand-covered casting is generally suitable for the production of large quantities of castings. Because the investment in iron molds for iron mold sand-covered casting is very large, a considerable number of iron molds must be supported for one product to meet the needs of the production process. Generally, more than 15 iron molds are required for one kind of casting, and even dozens of iron molds, so the capital investment in iron molds is very large, and it is difficult for small-batch casting products to bear. At the same time, in the production process, because heat-cured coated sand is used in iron mold sand-covered production, it is also very difficult to replace the mold during one shift of production. Therefore, generally speaking, small-batch castings are not suitable for production by iron mold sand-covered casting.

[0004] In order to realize the production of small-batch castings, the following several conditions must be met: 1. Reduce the number of iron molds invested; 2. It is not necessary to replace the mold during one shift of production. In the actual production process, in the setting of the iron mold sand-covered production line, the two double-station series connection method is often adopted in the sand-covered molding section to meet the above requirements. By adopting this method, the number of iron molds required for casting by the original iron mold sand-covered casting can be reduced by half, greatly saving the capital investment in iron molds; at the same time, the two double-station sand-covered molding machines are connected in series, and two kinds of casting products can be produced simultaneously during production, and two varieties of castings can be produced simultaneously without replacing the mold during one production shift. However, this layout method of the production line and equipment also has certain disadvantages: 1) It lengthens the production length and increases the floor area of the production line; 2) It greatly increases the equipment investment; 3) It lengthens the operation distance of the molding production workers and increases the labor intensity of the workers.

[0005] Such as Figures 1-2As shown in the figure, two sand shooting devices, two models, and an iron mold clamping and stripping mechanism of a general double-station iron mold coated sand molding machine are used to complete the sand coating molding work of one upper iron mold and one lower iron mold. The investment in the molds for iron mold coated sand casting production is large, mainly due to the investment in iron molds. For an iron mold coated sand production line, increasing the number of sand coating molding machines can reduce the number of iron molds invested, which is beneficial for the production of small batches of castings by iron mold coated sand casting. Therefore, some iron mold coated sand casting production lines adopt two double-station sand coating molding machines in series or one series four-station sand coating molding machine to achieve the above purpose. This layout requires a relatively long length of space, which not only increases the length of the production line but also increases the investment in the auxiliary equipment and molding equipment of the production line, and the automatic control of the production line is also relatively complex.

[0006] In a Chinese patent with a publication date of August 13, 2014 and a publication number of CN203764907U, a utility model patent named "A Double-Station Iron Mold Coated Sand Molding Device with Shuttle Moving Sand Shooting" is disclosed. The patent includes a main frame, a clamping and stripping mechanism, an iron mold conveying roller path, an iron mold positioning mechanism, and a sand shooting mechanism. The clamping and stripping mechanism is fixed on the base, and the clamping and stripping mechanism is provided with a lifting workbench and a lifting hydraulic cylinder. The lifting workbench is fixed on the lifting hydraulic cylinder, and the lifting hydraulic cylinder is fixed on the base. The iron mold conveying roller path is fixed on the column, and the iron mold conveying roller path is located below the upper beam. The iron mold positioning mechanism is fixed on the iron mold conveying roller path, and the sand shooting mechanism is fixed on the upper beam. Although this patent can improve the sand coating quality and sand coating efficiency and simplify the structure of the sand coating molding machine, the layout method not only increases the length of the production line but also increases the investment cost of the auxiliary equipment of the production line. Therefore, it still has the above-mentioned defects.

[0007] Therefore, it is particularly necessary to provide an iron mold coated sand molding device that can meet the simultaneous production of two products, does not increase the length of the production line, and has a small investment to meet the production needs of small batches of castings of multiple varieties. Summary of the Invention

[0008] The purpose of the present invention is to overcome the above-mentioned deficiencies existing in the prior art, and to provide a sand coating molding machine device with four templates and its working method, which has a simple and reasonable structure design, is safe and reliable, is convenient for installation, disassembly and maintenance, occupies a small space, and reduces the investment cost of the production line.

[0009] The technical solution adopted by the present invention to solve the above problems is as follows: The sand-covered molding machine device with four templates includes an iron mold conveying roller path, an upper beam, columns, a sand hopper, an air receiver, and a base. The upper beam is connected to the base through the columns. The sand hopper and the air receiver are arranged on the upper beam, and the iron mold conveying roller path is installed on the columns. It is characterized in that it further includes a sand shooting and sand covering mechanism, a mold closing and mold lifting mechanism, a template shuttling mechanism, and a sand shooting head shuttling mechanism. The sand shooting head of the sand shooting and sand covering mechanism is movably arranged on the upper beam, and the sand shooting head shuttling mechanism is matched with the sand shooting and sand covering mechanism. The number of the mold closing and mold lifting mechanism, the template shuttling mechanism, and the sand shooting head shuttling mechanism is at least two. Two sand shooting heads that can shuttle and move are arranged on each sand shooting head shuttling mechanism. The lifting cylinders of the two mold closing and mold lifting mechanisms are fixed on the base. The template shuttling mechanism is fixedly installed on the base. The template shuttling mechanism includes a moving frame trolley, a moving trolley cylinder, a template fixing seat, a moving trolley track, a fixed cross beam, a fixed seat hook, a trolley hook, and multiple track feet. The moving frame trolley is installed on the moving trolley track, and the moving trolley track is fixedly installed on the track feet. Multiple track feet are all fixed on the base, and the track feet are connected by the fixed cross beam. One end of the moving trolley cylinder is fixed on the fixed cross beam, and the piston rod of the moving trolley cylinder is connected to the moving frame trolley. Two template fixing seats are movably placed on the moving frame trolley. Two trolley hooks for preventing the moving frame trolley from rising are installed on both sides below the moving frame trolley, and a fixed seat hook is arranged on the template fixing seat.

[0010] Preferably, in the present invention, the two sand shooting heads are connected by two parallel double-headed hinge tie rods; so that the two sand shooting heads can shuttle and move synchronously with the movement of the moving cylinder of the sand shooting head shuttling mechanism. When one sand shooting head is completing the sand shooting process, it can also move upward for a small stroke (about 4 - 6 mm).

[0011] Preferably, in the present invention, the clearance between the lower plane of the moving frame trolley and the mold closing and mold lifting workbench is 3 - 5 mm.

[0012] Preferably, in the present invention, the clearance between the four sides of the template fixing seat and the four sides of the placement frame of the moving frame trolley is 2 - 4 mm.

[0013] Preferably, in the present invention, the inclined surface angles of the four sides of the template fixing seat and the four sides of the placement frame of the moving frame trolley are all 8° - 10°.

[0014] Preferably, in the present invention, the moving trolley track, the track feet, and the fixed cross beam are integrated.

[0015] Preferably, in the present invention, the iron mold conveying roller path adopts a motorized roller path or a manually pushed roller path.

[0016] Preferably, for the sand-covered molding machine device with four templates of the present invention, it is characterized in that: the base, the columns, and the upper beam are connected into a frame structure.

[0017] The present invention also provides a working method for a sand-coated molding machine device with four templates, which is characterized in that the steps are as follows: The sand-coated molding machine is provided with two sand-coated molding stations, four template installation stations, and four sand injection heads, and templates for two kinds of castings are installed at the same time; when sand-coated molding is carried out on the iron mold of one of the castings, the upper and lower iron molds of this casting enter the sand-coated molding station through the iron mold conveying roller path, and then the upper and lower templates of the casting to be molded are moved to the sand-coated molding station through the template shuttle mechanism. At the same time, the sand injection heads for sand injection and sand coating of the upper and lower iron molds of this casting are moved to the sand-coated molding station. The mold closing and stripping cylinder rises to drive the mold closing and stripping workbench, driving the template fixing seat installed with the template of this casting to rise until the template parting surface contacts the lower plane of the iron mold. Continuing to rise, the iron mold gradually detaches from the iron conveying roller path, and continues to rise until the upper plane of the iron mold contacts the lower plane of the sand injection head. Under the action of the mold closing and stripping cylinder, the sand injection head, the iron mold, and the template are completely and tightly fitted together to complete the mold closing work of the iron mold and the template. Then, sand-coated molding is carried out on the iron mold. When the sand-coated layer is completely cured, the mold closing and stripping cylinder drives the mold closing and stripping workbench to descend, and the iron mold, the template, and the template fixing seat descend accordingly. When the iron mold descends until its running edge touches the round surface of the roller of the iron mold conveying roller path, the iron mold no longer descends, while the fixing hook under the template fixing seat is pulled by the lower plane of the mold closing and stripping workbench, so that the template and the template fixing seat continue to descend accordingly, and the template gradually detaches from the iron mold, finally completing the separation of the iron mold and the template, and completing the stripping action of the iron mold and the template. The template and the template fixing seat continue to descend and fall back into the corresponding placement frames of the moving frame trolley. The stripping lifting cylinder drives the workbench to continue descending to the bottom. Subsequently, the iron mold is sent out of the sand-coated molding machine through the iron mold conveying roller path to complete the sand-coated molding of this casting mold; the sand-coated molding of the iron mold of the other casting is similar. The iron mold enters the sand-coated molding station through the iron mold conveying roller path, and the template of this casting is also moved to the sand-coated molding station through the template shuttle mechanism. At the same time, the sand injection head for sand injection and sand coating molding of this casting is moved to the sand-coated molding station. Subsequently, mold closing, sand injection molding, curing, and stripping of the iron mold and the template are carried out to complete the sand-coated molding work of the iron mold of this casting.

[0018] Compared with the prior art, the present invention has the following advantages and effects: 1) The overall structure design is simple and reasonable, safe and reliable, and the operation of the molding machine by workers is simple and the maintenance is convenient; 2) On a single iron mold sand-coated production line, a sand-coated molding machine is used to realize the iron mold sand-coated casting production of two varieties of castings; 3) Compared with two series-connected double-station or one series-connected four-station sand-coated molding machines, the structure is simple, two sand injection stations and two stripping mechanisms are reduced, the length is short, the floor area is small, and the capital investment is small; 4) The layout of the molding machine production line adopted in this application document is simple, matches with other auxiliary machines on the production line, and the iron mold conveying and running beats are synchronized, which is easy to realize the automatic control and operation of the production line. Description of the Drawings

[0019] Figure 1 It is a schematic diagram of a general - type double - station sand - covered molding machine Figure 1 .

[0020] Figure 2 It is a schematic diagram of a general - type double - station sand - covered molding machine Figure 2 .

[0021] Figure 3 It is a schematic diagram of the iron - mold sand - covered molding machine device in the embodiment of the present invention Figure 1 .

[0022] Figure 4 It is a schematic diagram of the iron - mold sand - covered molding machine device in the embodiment of the present invention Figure 2 .

[0023] Figure 5 It is a schematic diagram of the sand - shooting structure and working state in the embodiment of the present invention Figure 1 .

[0024] Figure 6 It is a schematic diagram of the sand - shooting structure and working state in the embodiment of the present invention Figure 2 .

[0025] Figure 7 It is a schematic diagram of the structure of the template shuttle mechanism in the embodiment of the present invention Figure 1 .

[0026] Figure 8 It is a schematic diagram of the structure of the template shuttle mechanism in the embodiment of the present invention Figure 2 .

[0027] Figure 9 It is a schematic diagram of the casting iron mold and template entering the sand - covered molding station in the embodiment of the present invention Figure 1 .

[0028] Figure 10 It is a schematic diagram of the casting iron mold and template entering the sand - covered molding station in the embodiment of the present invention Figure 2 .

[0029] Figure 11 It is a schematic diagram of the state of the casting iron mold during sand - covered sand - shooting molding in the embodiment of the present invention

[0030] Figure 12 It is a schematic diagram of the casting iron mold after molding is completed and not yet pushed out of the molding station, and the casting template and sand - shooting head entering the sand - covered molding station in the embodiment of the present invention

[0031] Figure 13 It is a schematic diagram of the casting iron mold, template, and shooting head all entering the sand - covered molding station in the embodiment of the present invention

[0032] Figure 14 It is a schematic diagram of the state of the casting iron mold during sand - covered sand - shooting molding in the embodiment of the present invention

[0033] Figure 15 It is a schematic diagram of the completed state of the mold removal of the iron mold for casting in the embodiment of the present invention.

[0034] Figure 16 It is Figure 8 a partially enlarged structural schematic diagram of

[0035] In the figure: sand shooting and sand covering mechanism 1, mold closing and mold removal mechanism 2, iron mold conveying roller table 3, upper beam 4, column 5, sand hopper 6, air receiver 7, base 8, template shuttling mechanism 9, sand shooting head shuttling mechanism 10, sand shooting head 11, double-headed hinge tie rod 12;

[0036] Template shuttling mechanism 9: moving frame trolley 91, moving trolley cylinder 92, template fixing seat 93, moving trolley track 94, track foot 95, fixed cross beam 96, fixed seat hook 97, trolley hook 98;

[0037] Sand shooting head one 111, sand shooting head two 112, upper surface of the sand shooting head 113, lower plane of the upper beam 41, distance H, gap J, angle D; sand shooting head on the casting 101, sand shooting head under the casting 102, upper iron mold of the casting 201, upper template of the casting 301, lower template of the casting 302. Specific embodiments

[0038] The present invention will be further described in detail below with reference to the accompanying drawings and through embodiments. The following embodiments are explanations of the present invention, and the present invention is not limited to the following embodiments.

[0039] Embodiment

[0040] Refer to Figures 3-15 , the four-template sand covering molding machine device in this embodiment includes a sand shooting and sand covering mechanism 1, a mold closing and mold removal mechanism 2, an iron mold conveying roller table 3, an upper beam 4, a column 5, a sand hopper 6, an air receiver 7, a base 8, a template shuttling mechanism 9 and a sand shooting head shuttling mechanism 10. The upper beam 4 is connected to the base 8 through the column 5. The sand hopper 6 and the air receiver 7 are arranged on the upper beam 4. The iron mold conveying roller table 3 is installed on the column 5. The sand shooting head of the sand shooting and sand covering mechanism 1 is movably arranged on the upper beam 4. The sand shooting head shuttling mechanism 10 is matched with the sand shooting and sand covering mechanism 1. The number of the mold closing and mold removal mechanism 2, the template shuttling mechanism 9 and the sand shooting head shuttling mechanism 10 is two. Two shuttleable sand shooting heads 11 are arranged on each sand shooting head shuttling mechanism 10. The lifting cylinders of the two mold closing and mold removal mechanisms 2 are fixed on the base 8.

[0041] Refer to Figures 3-4, six columns 5 are fixed on the base 8 of the sand-covered molding machine device in this embodiment. The columns 5 are fixed together with the upper beam 4. The base 8, columns 5, upper beam 4, etc. form a complete frame structure, and other devices are respectively installed on this frame structure. The iron mold conveying roller path 3 for the iron mold to enter and exit the molding station is fixedly installed on the column 5, which is used for the conveyance of the iron mold and serves as part of the iron mold stripping mechanism to fix the iron mold during molding and stripping. The conveying roller path can be a motorized roller path or a manually pushed roller path according to needs.

[0042] The lifting cylinders of the two mold clamping and stripping mechanisms 2 are fixedly installed on the base 8. As the lifting cylinders rise and fall, the stripping workbench moves up and down synchronously. The sand shooting and sand covering mechanism 1 is exactly the same as the sand shooting head structure, moving mode, and sand shooting principle of a common sand-covered molding machine, and will not be elaborated here.

[0043] As Figures 5-6 shown, Figure 5 is the state where the sand shooting head is in place; Figure 6 is that the sand shooting head is in place and rises to enter the sand covering state; there are two shuttle-movable sand shooting heads 11 on each sand-covered molding station, namely sand shooting head one 111 and sand shooting head two 112. Two parallel double-headed hinge tie rods 12 are used to connect the two sand shooting heads 11 on each molding and sand covering station, so that the two sand shooting heads can shuttle synchronously as the sand shooting head shuttle moving cylinder moves.

[0044] When sand shooting and molding are carried out at the sand shooting station, the sand shooting head for sand shooting and molding can rise with the clamping of the iron mold and the template at the sand-covered molding station. The effective distance H (about 4 - 6 mm) of the sand shooting head rises, and the sand shooting head disengages from the shuttle moving roller path. The upper surface 113 of the sand shooting head fits together with the lower plane 41 of the upper beam. Since the two sand shooting heads 11 are connected by double-headed hinge tie rods 12, when the sand shooting head at the sand-covered molding station rises, the other sand shooting head connected to the sand shooting head at the sand shooting station will not rise accordingly and will continue to stay on the sand shooting head shuttle track.

[0045] See Figures 7-8 and Figure 16, the template shuttle mechanism 9 includes a moving frame trolley 91, a moving trolley cylinder 92, a template fixing seat 93, a moving trolley track 94, a track foot 95, a fixed cross beam 96, a fixing seat hook 97 and a trolley hook 98. The template shuttle mechanism 9 is fixedly installed on the base 8. The moving frame trolley 91 is installed on the moving trolley track 94 and can move back and forth on the moving trolley track 94 as the piston rod of the moving trolley cylinder 92 moves; the moving trolley track 94 is fixedly installed on 12 track feet 95, and the track feet 95 are fixedly installed on the base 8 of the flaskless molding machine; the track feet 95 are connected by 6 fixed cross beams 96. The moving trolley track 94, the track feet 95, the fixed cross beam 96, etc. form an integral structure, and the track feet 95 are fixedly connected to the base 8; one end of the moving trolley cylinder 92 is fixedly installed on the fixed cross beam 96 of the track foot 95, and the piston rod of the moving trolley cylinder 92 is fixedly connected to the moving frame trolley 91. As the piston rod of the moving trolley cylinder 92 extends and retracts back and forth, the moving frame trolley 91 can make a back-and-forth shuttle movement.

[0046] Two template fixing seats 93 are placed on the moving frame trolley 91. The two template fixing seats 93 are used to fixedly place the templates for two casting products; the two template fixing seats 93 are movably placed in the two frames of the moving frame trolley 91. Under the action of the mold closing and mold lifting mechanism 2, the template fixing seats 93 can rise and separate from the moving frame trolley 91.

[0047] There is a certain gap J of 2 - 4 mm between the four sides of the template fixing base 93 and the four sides of the placement frame of the moving frame trolley 91, and the four sides of the template fixing base 93 and the four sides of the placement frame of the moving frame trolley 91 all have a certain inclined plane angle D of 8° - 10°, which is used for guiding when the template fixing base 93 descends and returns to the corresponding placement frame of the frame trolley. The upper plane of the template fixing base 93 is used for installing the model template. When the sand-covered molding is closed, as the mold-closing and mold-lifting workbench rises, the template fixing base 93 equipped with the casting template can be separated from the placement frame of the moving frame trolley 91. When the mold-lifting is completed after the sand-covered molding is solidified, as the mold-closing cylinder descends, the model template fixing base can fall back into the corresponding placement frame of the trolley. Two trolley hooks h for preventing the moving frame trolley 91 from rising are fixedly installed on both sides under the two placement frames. When the workbench at the sand-covered station rises and drives the template fixing base 93 to rise, the four anti-rising trolley hooks 98 fixedly installed under the placement frame hook the lower moving frame trolley, fixing the moving frame trolley 91 to prevent the moving frame trolley from rising along with it, so that the template fixing base 93 can smoothly separate from the placement frame of the moving frame trolley 91 and rise with the rise of the workbench, thus completing the mold-closing of the model template and the iron mold. When the sand-covered sand shooting molding and solidification are completed and it enters the iron mold and the template mold, the mold-closing and mold-lifting workbench descends, driving the iron mold, the template, etc. to descend. When the iron mold descends until the iron mold runner touches the conveying roller of the conveying roller path, the iron mold is blocked and no longer descends. However, the template fixing base 93 and the template still descend synchronously with the workbench because the lower fixing base hook 97 pulls the lower plane of the workbench, so that the iron and the model are gradually separated, and finally the mold-lifting work of the iron mold and the template is completed.

[0048] See Figures 9-15, the working process of the sand-covered molding machine device of the template in the fourth embodiment is as follows: This sand-covered molding machine device is provided with two sand-covered molding stations, four template installation stations, and four sand injection heads, and can install templates of two types of castings simultaneously; when sand-covered molding is performed on the iron mold of one of the castings, the upper and lower iron molds of this casting enter the sand-covered molding station through the iron mold conveying roller path 3, and then through the template shuttle mechanism 9, the upper template 301 and the lower template 302 of the casting to be molded are moved to the sand-covered molding station, and at the same time, the upper sand injection head 101 and the lower sand injection head 102 for sand injection and sand covering of the upper iron mold 201 and the lower iron mold of this casting are moved to the sand-covered molding station. The mold clamping and stripping cylinder rises to drive the mold clamping and stripping workbench, driving the template fixing seat 93 installed with the template of this casting to rise until the template parting surface contacts the lower plane of the iron mold. Continuing to rise, the iron mold gradually disengages from the iron conveying roller path, and continues to rise until the upper plane of the iron mold contacts the lower plane of the sand injection head. Under the action of the mold clamping and stripping cylinder, the sand injection head, the iron mold, and the template are completely and tightly fitted together, completing the mold clamping work of the iron mold and the template. Then, sand-covered molding (sand injection and sand covering, curing) is performed on the iron mold. When the sand-covered layer is completely cured, the mold clamping and stripping cylinder drives the mold clamping and stripping workbench to descend, and the iron mold, the template, and the template fixing seat 93 descend accordingly. When the iron mold descends until its running edge touches the roller round surface of the iron mold conveying roller path 3, the iron mold stops descending, while the hook below the template fixing seat 93 is pulled by the lower plane of the mold clamping and stripping workbench, so that the template and the template fixing seat 93 continue to descend accordingly, and the template gradually disengages from the iron mold, finally completing the separation of the iron mold and the template, completing the mold stripping action of the iron mold and the template. The template and the template fixing seat 93 continue to descend and fall back into the corresponding placement frame of the moving frame trolley. The mold stripping lifting cylinder drives the workbench to continue descending to the bottom. There is a gap of 3 - 5 millimeters between the upper plane of the workbench and the lower plane of the frame of the moving frame trolley 91, so that when the moving frame trolley 91 makes a shuttle movement, there will be no collision between the trolley and the workbench. Subsequently, the iron mold can be sent out of the sand-covered molding machine through the iron mold conveying roller path 3, completing the sand-covered molding of this casting type; the sand-covered molding of the iron mold of the other casting is similar. The iron mold enters the sand-covered molding station through the iron mold conveying roller path 3, and similarly, the template of this casting is moved to the sand-covered molding station through the template shuttle mechanism 9, and at the same time, the sand injection head for sand injection and sand-covered molding of this casting is moved to the sand-covered molding station. Subsequently, mold clamping, sand injection molding, curing, and mold stripping of the iron mold and the template are carried out to complete the sand-covered molding work of the iron mold of this casting.

[0049] This embodiment is used for an iron mold sand-covered casting production line that can produce iron molds of two types of castings simultaneously with one iron mold sand-covered molding equipment, which can reduce the demand for iron molds required by the iron mold sand-covered casting production line by half, greatly reducing the mold input cost of using the iron mold sand-covered casting technology, making it possible to produce many small-batch casting products using the iron mold sand-covered casting technology, and thus greatly improving the quality of castings.

[0050] In this embodiment, the sand-covered molding of the sand-covered molding machine is to blow the coated sand in the sand-blowing head into the gap between the mold and the iron mold through compressed air to form a thin sand-covered layer, and then solidify and remove the mold to finally form an iron mold sand-covered casting mold.

[0051] The working principle of the molding machine device in this embodiment: Refer to Figures 3-4 , there are a total of two sand-covered molding stations. Each station is equipped with a template shuttle mechanism 9 that can place two templates, that is: on the basis of only two model stations in the two sand-covered molding stations, two more template stations are added, that is: there are a total of four template stations arranged on both sides of the two sand-blowing molding stations in a two-by-two parallel connection method, and they are connected to each other through a shuttle mechanism and can be respectively moved to the sand-blowing molding station; there are two shuttleable sand-blowing heads on each molding station, corresponding to two sets of templates. When performing sand-covered molding on a product casting, the template and sand-blowing head that need sand-covered molding are shuttled to the sand-covered molding station for sand-covered molding. When performing sand-covered molding on another product casting, the template and sand-blowing head of the other product casting can be shuttled to the sand-covered molding station for sand-covered molding.

[0052] This embodiment adopts two sand-blowing stations, that is: two mold-closing and mold-removing mechanisms 2, which are similar to ordinary double-station sand-covered molding machines; two template shuttle mechanisms 9, which can install four templates, that is: templates for two types of castings; two shuttleable sand-blowing head shuttle mechanisms 10, and each sand-blowing head shuttle mechanism 10 is equipped with two sand-blowing heads, so that the sand-covered molding work of two different types of castings - four different iron molds can be realized on the two sand-blowing and sand-covered molding stations.

[0053] The difference between the device in this embodiment and the ordinary double-station iron mold sand-covered molding machine is that: two sets of template shuttle mechanisms 9 are added, increasing the template stations from the original two template stations to four model stations; at the same time, template fixing seats 93 and fixing hooks 97 are added; originally, there was one shuttleable sand-blowing head on each sand-blowing and sand-covered molding station, which is increased to two sand-blowing heads connected together and shuttled, changing the original two sand-blowing heads to four sand-blowing heads.

[0054] The sand-covered molding machine device in this embodiment can place four sand-covered molding templates, that is, four templates for two types of castings, and the length of the molding device is similar to that of the molding device of two stations. It can be used for the iron mold sand-covered casting production line for simultaneously producing two types of castings, and the capital investment of the molding device is less than that of two double-station sand-covered molding machines, thus greatly reducing the investment in iron mold tooling for the production line and reducing the investment in iron mold sand-covered casting production tooling.

[0055] Through the above description, those skilled in the art can already implement it.

[0056] In addition, it should be noted that for the specific embodiments described in this specification, the shapes and names of the components can be different. The above content described in this specification is only an illustrative example of the structure of the present invention. Any equivalent changes or simple changes made to the structure, features, and principles according to the concept of the present invention are included in the protection scope of the present invention. Those skilled in the technical field to which the present invention pertains can make various modifications, supplements, or use similar methods for substitution to the specific embodiments described, as long as they do not deviate from the structure of the present invention or exceed the scope defined by this claims, they should fall within the protection scope of the present invention.

Claims

1. A four-template sand-covered molding machine device, comprising an iron mold conveying roller path, an upper beam, columns, a sand hopper, an air receiver, and a base. The upper beam is connected to the base through the columns. The sand hopper and the air receiver are arranged on the upper beam, and the iron mold conveying roller path is installed on the columns. It is characterized in that: It also includes a sand shooting and sand covering mechanism, a mold clamping and mold lifting mechanism, a template shuttling mechanism and a sand shooting head shuttling mechanism. The sand shooting head of the sand shooting and sand covering mechanism is movably arranged on the upper beam. The sand shooting head shuttling mechanism is matched with the sand shooting and sand covering mechanism. The number of the mold clamping and mold lifting mechanism, the template shuttling mechanism and the sand shooting head shuttling mechanism is at least two. Two sand shooting heads that can shuttle and move are arranged on each sand shooting head shuttling mechanism. The lifting cylinders of the two mold clamping and mold lifting mechanisms are fixed on the base. The template shuttling mechanism is fixedly installed on the base. The template shuttling mechanism includes a moving frame trolley, a moving trolley cylinder, a template fixing seat, a moving trolley track, a fixed cross beam, a fixed seat hook, a trolley hook and multiple track feet. The moving frame trolley is installed on the moving trolley track. The moving trolley track is fixedly installed on the track feet. The multiple track feet are all fixed on the base. The track feet are connected by the fixed cross beam. One end of the moving trolley cylinder is fixed on the fixed cross beam. The piston rod of the moving trolley cylinder is connected with the moving frame trolley. Two template fixing seats are movably placed on the moving frame trolley. Two trolley hooks for preventing the moving frame trolley from rising are installed on each side below the moving frame trolley. A fixed seat hook is arranged on the template fixing seat. The moving trolley track, the track feet and the fixed cross beam are integrated. The iron mold conveying roller table adopts a motorized roller table or a manually pushed roller table.

2. The four-template sand-covered molding machine device according to claim 1, characterized in that: The two sand shooting heads are connected by two parallel double-headed hinge tie rods. A sand shooting head has a rising moving stroke of 4-6 mm during the sand shooting process.

3. The four-template sand-covered molding machine device according to claim 1, characterized in that: The clearance between the lower plane of the moving frame trolley and the workbench of the mold clamping and mold lifting mechanism is 3-5 mm.

4. The four-template sand-covered molding machine device according to claim 1, characterized in that: The clearance between the four sides of the template fixing seat and the four sides of the placement frame of the moving frame trolley is 2-4 mm.

5. The four-template sand-covered molding machine device according to claim 4, characterized in that: The inclined plane angles between the four sides of the template fixing seat and the four sides of the placement frame of the moving frame trolley are all 8°-10°.

6. The four-template sand-covered molding machine device according to claim 1, characterized in that: The base, the columns and the upper beam are connected into a frame structure.

7. A working method of a four-template sand-covered molding machine device, adopting the four-template sand-covered molding machine device according to any one of claims 1-6, characterized in that: The steps are as follows: The sand covering molding machine is equipped with two sand covering molding stations, four template installation stations, and four sand shooting heads, and the templates of two kinds of castings are installed simultaneously; when sand covering and molding the iron mold of one kind of casting, the upper and lower iron molds of this casting enter the sand covering molding station through the iron mold conveying roller path, and then the upper and lower templates of the casting to be molded are moved to the sand covering molding station through the template shuttle mechanism. At the same time, the sand shooting heads for sand shooting and sand covering of the upper and lower iron molds of this casting are moved to the sand covering molding station. The mold closing and stripping cylinder rises to drive the mold closing and stripping workbench, driving the template fixing seat installed with the template of this casting to rise until the template parting surface contacts the lower plane of the iron mold. Continuing to rise, the iron mold gradually disengages from the iron conveying roller path and continues to rise until the upper plane of the iron mold contacts the lower plane of the sand shooting head. Under the action of the mold closing and stripping cylinder, the sand shooting head, the iron mold, and the template are completely and tightly fitted together to complete the mold closing work of the iron mold and the template. Then, sand covering and molding are carried out on the iron mold. When the sand covering layer is completely cured, the mold closing and stripping cylinder drives the mold closing and stripping workbench to descend, and the iron mold, the template, and the template fixing seat descend accordingly. When the iron mold descends until its runner touches the round surface of the roller of the iron mold conveying roller path, the iron mold stops descending, while the fixing hook under the template fixing seat is pulled by the lower plane of the mold closing and stripping workbench, so that the template and the template fixing seat continue to descend accordingly, and the template gradually disengages from the iron mold, finally completing the separation of the iron mold and the template and completing the stripping action of the iron mold and the template. The template and the template fixing seat continue to descend and fall back into the corresponding placement frame of the moving frame trolley. The stripping lifting cylinder drives the workbench to continue descending to the bottom, and then the iron mold is sent out of the sand covering molding machine through the iron mold conveying roller path to complete the sand covering molding of this casting mold; the sand covering molding of the iron mold of the other kind of casting is similar. The iron mold enters the sand covering molding station through the iron mold conveying roller path, and the template of this casting is also moved to the sand covering molding station through the template shuttle mechanism. At the same time, the sand shooting head for sand shooting and sand covering molding of this casting is moved to the sand covering molding station, and then the mold closing, sand shooting molding, curing, and stripping of the iron mold and the template are carried out to complete the sand covering molding work of the iron mold of this casting.

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