Precoated sand paving device for casting

Abstract

The invention discloses a precoated sand paving device for casting, and belongs to the technical field of casting forming equipment. Comprising a sand feeding mechanism and a plate curtain type sand carrying mechanism used for receiving and bearing precoated sand fed by the sand feeding mechanism, the sand feeding mechanism is supported on a terrace of a casting place in a using state, the left end of the plate curtain type sand carrying mechanism extends to the sand feeding mechanism, and the right end of the plate curtain type sand carrying mechanism is also supported on the terrace of the casting place. The precoated sand laying machine has the advantages that the precoated sand can be fed to the plate curtain type sand carrying mechanism by the sand feeding mechanism, so that a layer of uniform precoated sand can be laid on the plate curtain type sand carrying mechanism, and the precoated sand can well protect a mold and a plate curtain which are arranged on the precoated sand, so that the uniformity and the mechanical property of the structure of a casting part are improved, and the quality of the casting part is improved. Ideal heat insulation and heat preservation effects are embodied, the stability of the position and posture of the mold is guaranteed, and conditions are provided for improving the casting efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of casting molding equipment, and in particular relates to a coated sand paving device for casting. Background Art

[0002] The aforementioned coated sand, also known as shell sand, is a molding sand or core sand with a layer of solid resin film on the surface of sand particles (such as quartz sand). Coated sand has suitable strength properties and good fluidity, and can produce complex sand cores with dense structure and clear outline.

[0003] The coating sand for casting described in the present application refers to automatically laying a layer of coating sand of uniform thickness on the upper surface of a plate curtain that moves in a cycle, and online workers place the molds for casting and forming products one by one on the surface of the coating sand on the plate curtain, and the molten steel or molten iron is poured into the mold by the steel ladle, iron ladle, teapot ladle or ductile iron ladle corresponding to the mold above the plate curtain (called "casting" in the industry), and then a cycle is formed by standing, demolding, demolding, discharging, sand collecting and sand covering.

[0004] According to common sense, the purpose of laying a sand layer on the plate curtain and placing the casting mold of the required workpiece on the sand layer for casting is not only to avoid direct damage to the plate curtain, but also to avoid damage to the plate curtain. There are many other factors: it plays a role in protecting the mold and the plate curtain, because the sand layer can provide a certain buffering effect, reducing the direct damage to the plate curtain under the mold caused by the impact force of the molten metal during the casting process. At the same time, the sand can also prevent the molten metal from splashing during casting, which is beneficial to protecting the working environment and equipment safety; it plays a role in ensuring the quality of casting, because the sand layer helps to stabilize the mold and prevent the mold from moving or deforming during the casting process, thereby ensuring the quality and dimensional accuracy of the casting. In addition, the sand layer can also control the cooling rate of the molten metal to a certain extent and is beneficial to the uniformity of the casting structure and the improvement of the mechanical properties; it plays a good role in heat insulation, because the sand layer has ideal heat insulation performance, and can reduce the heat loss of the molten metal during the casting process, making the metal solidification process more uniform. This is especially important for castings that require strict control of solidification conditions; it plays a supporting and fixing role, because the sand layer can provide the necessary support and fixation for the mold, ensuring that the mold can maintain a stable position and posture during the casting process. This is especially important for castings with relatively complex shapes or relatively large volumes; it can facilitate cleaning and maintenance, because after the casting is completed, the sand layer can be relatively cleared, which is convenient for the subsequent maintenance and care of the plate curtain and mold.

[0005] In the public Chinese patent literature, technical information related to the processing of coated sand can be found. For example, CN208743610U recommends a "new type of coated sand production device" and CN2633467Y provides a "thermal regeneration device for coated sand for casting", etc. However, there is no relevant technical information for laying coated sand on a plate curtain and playing the aforementioned role. The technical solution to be introduced below was produced in this context. Summary of the invention

[0006] The task of the present invention is to provide a coated sand spreading device for casting which can evenly spread coated sand on a plate curtain to effectively protect the mold and the plate curtain, improve the uniformity and mechanical properties of the casting workpiece structure, embody ideal thermal insulation, ensure the stability of the mold position and posture, and provide conditions for improving casting efficiency.

[0007] The task of the present invention is accomplished in this way: a sand-laying device for coated sand for casting includes a sand feeding mechanism and a plate curtain type sand carrying mechanism for receiving and carrying the coated sand fed by the sand feeding mechanism. The sand feeding mechanism is supported on the floor of the casting site when in use, and the left end of the plate curtain type sand carrying mechanism extends to the sand feeding mechanism, while the right end is also supported on the floor of the casting site.

[0008] In a specific embodiment of the present invention, the sand feeding mechanism includes a sand feeding hopper support frame, a sand feeding hopper and a sand uniforming and guiding device. The sand feeding hopper support frame is supported on the floor of the casting site when in use. The sand feeding hopper is arranged on the top of the sand feeding hopper support frame through a sand feeding hopper fixing block. The upper part of the sand feeding hopper is configured to be open, and the lower part and along the length direction of the sand feeding hopper are configured to have a sand feeding hopper sand outlet groove for leading out the coated sand in the sand feeding hopper cavity of the sand feeding hopper. The sand uniforming and guiding device is arranged on the upper right side in the length direction of the sand feeding hopper; the left end of the plate curtain type sand loading mechanism extends to the middle of the height direction of the sand feeding hopper support frame at a position corresponding to the bottom of the sand feeding hopper, and the coated sand from the sand feeding hopper sand outlet groove is received by the left end of the plate curtain type sand loading mechanism.

[0009] In another specific embodiment of the present invention, the sand outlet slot of the sand feeding hopper is composed of a lower portion of the left side wall of the sand feeding hopper in the length direction inclined toward the right side wall of the sand feeding hopper and a space with a width of 0.5-1.5 cm formed between the lower portion of the right side wall of the sand feeding hopper in the length direction.

[0010] In another specific embodiment of the present invention, the sand uniforming and guiding device includes a driving plate cylinder, a cylinder slider driving plate, a sand guide rod reciprocating slider guide rail, a sand guide rod reciprocating slider, a sand guide rod and a sand driving and uniforming plate. The front end and the rear end of the driving plate cylinder are respectively supported and fixed on a driving plate cylinder seat, and the driving plate cylinder seat is fixed to the upper part of the right side wall of the sand feeding hopper facing away from the sand feeding hopper cavity, the cylinder slider driving plate is fixed to the driving plate cylinder slider of the driving plate cylinder, the sand guide rod reciprocating slider guide rail corresponds to the upper part of the right side wall of the sand feeding hopper facing toward the sand feeding hopper cavity, and the rear end of the sand guide rod reciprocating slider guide rail is aligned with the sand feeding hopper. The upper edge of the rear side wall is fixed, and the front end is fixed to the upper edge of the front side wall of the sand feeding hopper. The reciprocating slider of the sand guide rod slides with the guide rail of the reciprocating slider of the sand guide rod through its slider groove. The upper end of the sand guide rod is formed with a slider fixing plate bent in the direction of the reciprocating slider of the sand guide rod. The slider fixing plate is fixed to the upward side of the reciprocating slider of the sand guide rod. The lower end of the sand guide rod extends downward to the position of the sand outlet slot of the sand feeding hopper in a longitudinal cantilever state. The sand driving and sand uniforming plate is fixed to the left side of the sand guide rod in a longitudinal state and forms a vertical relationship with the left side of the sand guide rod. The bottom of the sand driving and sand uniforming plate corresponds to the upper side of the sand outlet slot of the sand feeding hopper while maintaining a distance from the sand outlet slot of the sand feeding hopper.

[0011] In another specific embodiment of the present invention, the driving plate acting cylinder is a rodless cylinder; the cross-sectional shape of the reciprocating slider guide rail of the sand guide rod is dovetail-shaped, and the cross-sectional shape of the slider groove is also dovetail-shaped; the rodless cylinder is a rodless cylinder that works forward and reversely.

[0012] In another specific embodiment of the present invention, the plate curtain type sand carrying mechanism includes a left crossbeam support frame, a right crossbeam support frame, a front crossbeam, a rear crossbeam, a plate curtain transmission active sprocket, a plate curtain transmission driven sprocket, a plate curtain and a plate curtain transmission driving device. The left crossbeam support frame is supported on the floor at a position corresponding to the bottom of the sand feeding hopper, the right crossbeam support frame corresponds to the right side of the left crossbeam support frame and is also supported on the floor, the front crossbeam and the rear crossbeam remain parallel to each other in the length direction, and the left ends of the front and rear crossbeams are supported and fixed on the top of the left support frame, while the right ends of the front and rear crossbeams are supported and fixed on the top of the right crossbeam support frame, the spacing between the opposite sides of the front and rear crossbeams is adapted to the width of the plate curtain, and the number of plate curtain transmission active sprockets are respectively fixed on the front end and rear end of the plate curtain transmission active sprocket shaft And a pair of them are located between the front and rear beams, the front end and rear end of the plate curtain transmission active sprocket shaft are respectively supported by bearing seats on the right ends of the front and rear beams, and the front end of the plate curtain transmission active sprocket shaft also extends to the front side of the front beam, the number of plate curtain transmission driven sprockets is a pair of them respectively fixed at the front and rear ends of the plate curtain transmission driven sprocket shaft and located between the front and rear beams, the front end and rear end of the plate curtain transmission driven sprocket shaft are respectively supported by bearing seats on the left ends of the front and rear beams, the plate curtain is located between the front and rear beams, and the right end of the plate curtain is sleeved on the pair of plate curtain transmission active sprockets, and the left end is sleeved on a pair of plate curtain transmission driven sprockets, the plate curtain transmission drive device is arranged on the right support frame of the beam and is connected to the plate curtain transmission active sprocket shaft.

[0013] In a more specific embodiment of the present invention, the panel curtain is composed of a plurality of curtain pieces, a front chain link, a rear chain link and a chain link hinge shaft, and a pair of curtain piece hinge ears 1 and a pair of curtain piece hinge ears 2 are respectively fixed on one side of the curtain piece facing the panel curtain cavity, the pair of curtain piece hinge ears 1 are fixed on one side of the curtain piece, and the pair of curtain piece hinge ears 1 are each provided with a hinge ear hole 1 corresponding to each other, the pair of curtain piece hinge ears 2 are fixed on the other side of the curtain piece in a state corresponding to the pair of curtain piece hinge ears 1, and the pair of curtain piece hinge ears 2 are each provided with a hinge ear hole 1 corresponding to each other. Two hinged ear holes are provided at positions corresponding to each other, and the pair of hinged ears 2 and the pair of hinged ears 1 on each of the two adjacent curtain pieces are hingedly connected by the chain link hinge shaft, and each of the curtain pieces corresponds to a front chain link and a rear chain link, and the front chain link corresponds to the front end of the curtain piece, and the rear chain link corresponds to the rear end of the curtain piece, and a curtain piece sealing overlapped step edge is formed on one side of the length direction of the curtain piece for preventing the coated sand from leaking from the gap between the adjacent curtain pieces, and the curtain piece sealing overlapped step edge and the adjacent curtain piece The upper surface of the edge part of one side in the length direction coincides with that of the chain link, the chain link articulation shaft passes through the chain front link chain plate holes on a pair of chain front link chain plates constituting the chain front link, the articulation ear hole 1, the articulation ear hole 2 and the chain rear link chain plate holes on a pair of chain rear link chain plates constituting the chain rear link, and the chain link articulation shaft front limiting piece is arranged at the front end of the chain link articulation shaft at a position corresponding to the front side of the chain front link to limit the chain link articulation shaft from moving, and the chain link articulation shaft rear limiting piece is arranged at the rear side of the chain rear link The position is set at the rear end of the chain link hinge shaft to prevent the chain link hinge shaft from moving. The chain link hinge shaft hinges the front chain link of the chain corresponding to each curtain piece, a pair of chain piece hinge ears one, a pair of chain piece hinge ears two and the rear chain link of the chain to form an endless ring structure for the panel curtain. The right ends of the front chain and the rear chain formed by the hinge of the front chain link and the rear chain link through the chain link hinge shaft are respectively mounted on the aforementioned pair of panel curtain transmission active sprockets, and the left ends are respectively mounted on the aforementioned pair of panel curtain transmission driven sprockets.

[0014] In a further specific embodiment of the present invention, the panel curtain transmission drive device comprises a panel curtain drive motor, a panel curtain drive reduction box, a panel curtain drive driving wheel, a panel curtain drive driven wheel and a panel curtain drive transmission belt. The panel curtain drive motor is electrically connected to the electrical control box when in use. The panel curtain drive motor cooperates with the panel curtain drive reduction box in transmission and is supported on a panel curtain drive reduction box support seat together with the panel curtain drive motor by the panel curtain drive reduction box. The panel curtain drive reduction box support seat is fixed on a support seat fixing plate, and the support seat plate is fixed on the right support frame of the crossbeam, wherein the panel curtain drive reduction box output shaft of the panel curtain drive reduction box faces forward, the panel curtain drive driving wheel is fixed on the panel curtain drive reduction box output shaft, and the panel curtain drive driven wheel is fixed on the front end of the panel curtain drive driving sprocket shaft, and one end of the panel curtain drive transmission belt is sleeved on the panel curtain drive driving wheel, and the other end is sleeved on the panel curtain drive driven wheel.

[0015] In yet another specific embodiment of the present invention, the panel curtain driving active wheel and the panel curtain driving driven wheel are sprocket wheels or pulleys, and the panel curtain driving transmission belt is a chain or a belt.

[0016] In yet another specific embodiment of the present invention, a mold signal collector for collecting signals of a mold to be cast placed on the coated sand on the surface of the plate curtain is provided at the upper left end of the front crossbeam or the rear crossbeam. The mold signal collector is a photoelectric switch, which is electrically connected to the electrical control box when in use.

[0017] The technical effect of the technical solution provided by the present invention is that: since the coated sand can be fed to the plate curtain type sand carrying mechanism by the sand feeding mechanism, a uniform layer of coated sand can be laid on the plate curtain type sand carrying mechanism, and the coated sand can play a good protective role for the mold and the plate curtain placed thereon, which helps to improve the uniformity and mechanical properties of the casting structure, embodies the ideal thermal insulation effect, ensures the stability of the mold position and posture, and provides conditions for improving the casting efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of an embodiment of the present invention.

[0019] Figure 2 for Figure 1 The detailed structural diagram of the sand uniforming and sand guiding device is shown.

[0020] Figure 2a for Figure 1 The assembly structure diagram of the panel curtain is shown.

[0021] Figure 3 It is a schematic diagram of an application example of the present invention.

[0022] Figure 4 For configuration in Figure 1 The plate curtain type sand loading mechanism shown is Figure 3 The schematic diagram of the vibrating mold and sand connecting mechanism and the casting output mechanism between the coated sand recycling mechanism is shown.

[0023] Figure 5 for Figure 3 and Figure 4 Schematic diagram of the coated sand recycling mechanism shown. DETAILED DESCRIPTION

[0024] In order to more clearly understand the technical essence and beneficial effects of the present invention, the applicant will provide a detailed description in the form of embodiments below. However, the description of the embodiments is not a limitation on the technical solution of the present invention. Any equivalent changes made based on the concept of the present invention that are merely formal but not substantial should be regarded as within the scope of the technical connotation disclosed by the present invention.

[0025] In the following description, all concepts related to up, down, left, right, front and back directions or orientations are based on the current Figure 1 The position state is taken as a reference, and thus it cannot be understood as a special limitation on the technical solution provided by the present invention.

[0026] See also Figure 1 , shows a sand feeding mechanism 1 and a plate curtain type sand carrying mechanism 2 for receiving and carrying the coated sand fed by the sand feeding mechanism 1. The sand feeding mechanism 1 is supported on the floor of the casting site when in use. The left end of the plate curtain type sand carrying mechanism 2 extends to the sand feeding mechanism 1, and the right end is also supported on the floor of the casting site.

[0027] The aforementioned sand feeding mechanism 1 includes a sand feeding hopper support frame 11, a sand feeding hopper 12 and a uniform sand guiding device 13. The sand feeding hopper support frame 11 is a hollow frame structure, more figuratively speaking, it is in the shape of a well frame. The sand feeding hopper support frame 11 is supported on the floor of the casting site when in use. The sand feeding hopper 12 is arranged on the top of the sand feeding hopper support frame 11 through the sand feeding hopper fixing blocks 123 located (fixed) at the four corners of the sand feeding hopper 1. The upper part of the sand feeding hopper 12 is open, and the lower part is not A sand feeding hopper sand outlet slot 122 is formed along the length direction of the sand feeding hopper 12 for leading out the coated sand in the sand feeding hopper cavity 121 of the sand feeding hopper 12, and a sand uniforming and guiding device 13 is arranged on the upper right side in the length direction of the sand feeding hopper 12; the left end of the aforementioned plate curtain type sand loading mechanism 2 extends to the middle part of the height direction of the aforementioned sand feeding hopper support frame 11 at a position corresponding to the lower part of the aforementioned sand feeding hopper 12, and the coated sand coming out of the aforementioned sand feeding hopper sand outlet slot 122 is received (obtained) by the left end of the aforementioned plate curtain type sand loading mechanism 2.

[0028] The sand feeding hopper sand outlet slot 122 is formed by the lower portion of the length direction of the left side wall of the sand feeding hopper 12, which is inclined toward the right side wall of the sand feeding hopper 12, and the space with a width of 0.5-1.5 cm is formed between the lower portion of the length direction of the right side wall of the sand feeding hopper. The aforementioned 0.5-1.5 cm space is a preferred width, preferably 0.6-1.3 cm, more preferably 0.9-1.1 cm, and most preferably 1 cm. In this embodiment, 1 cm is selected.

[0029] Please refer to Figure 2 And combined with Figure 1 , the aforementioned sand uniforming and guiding device 13 comprises a driving plate cylinder 131, a cylinder slider driving plate 132, a sand guiding rod reciprocating slider guide rail 133, a sand guiding rod reciprocating slider 134, a sand guiding rod 135 and a sand driving and uniforming plate 136. The driving plate cylinder 131 is electrically controlled and connected to the electrical control box when in use. The front end and the rear end of the driving plate cylinder 131 are respectively supported and fixed on a driving plate cylinder seat 1312, and the driving plate cylinder seat 1312 is fixed to the upper part of the right side wall of the sand feeding hopper of the aforementioned sand feeding hopper 12 facing away from the aforementioned sand feeding hopper cavity 121. The cylinder slider driving plate 132 is fixed to the driving plate cylinder slider 1311 of the driving plate cylinder 131. The sand guiding rod reciprocating slider guide rail 133 corresponds to the upper part of the right side wall of the sand feeding hopper of the aforementioned sand feeding hopper 12 facing the aforementioned sand feeding hopper cavity 121, and the sand guiding rod reciprocating slider guide rail 133 The rear end is fixed to the upper edge of the rear side wall of the sand feeding hopper 12, and the front end is fixed to the upper edge of the front side wall of the sand feeding hopper 12. The sand guide rod reciprocating sliding block 134 slides with the sand guide rod reciprocating sliding block guide rail 133 through its sliding block groove 1341. The upper end of the sand guide rod 135 is formed with a sliding block fixing plate 1351 bent in the direction of the sand guide rod reciprocating sliding block 134. The sliding block fixing plate 1351 is fixed to the upper side of the sand guide rod reciprocating sliding block 134. The lower end of the sand guide rod 135 extends downward in a longitudinal cantilever state to the position of the sand outlet slot 122 of the aforementioned sand feeding hopper. The sand driving and sand uniforming plate 136 is fixed to the left side surface of the aforementioned sand guide rod 135 in a longitudinal state, and forms a vertical relationship with the left side surface of the sand guide rod 135. The bottom of the sand driving and sand uniforming plate 136 corresponds to the upper side of the sand outlet slot 122 of the sand feeding hopper while maintaining a distance from the aforementioned sand outlet slot 122 of the sand feeding hopper.

[0030] In this embodiment, the aforementioned driving plate cylinder 131 is a rodless cylinder; the cross-sectional shape of the aforementioned sand guide rod reciprocating slider guide rail 133 is dovetail-shaped, and accordingly, the cross-sectional shape of the aforementioned slider groove 1341 is also dovetail-shaped.

[0031] In this embodiment, the aforementioned rodless cylinder is a rodless cylinder that works in forward and reverse directions.

[0032] See you next time Figure 1 and Figure 2 And combined with Figure 3 ,Depend on Figure 3 The negative pressure vacuum loader 3 shown introduces the recycled coated sand into the sand feeding hopper chamber 121 of the sand feeding hopper 12 through a hose 31 connected to the discharge port of the negative pressure vacuum loader 3, and the sand feeding hopper sand outlet slot 122 is introduced into the corresponding plate curtain type sand carrying mechanism 2 below which will be described in detail below. In the process of feeding sand from the aforementioned sand feeding hopper 12, under the control of the electrical control box, the driving plate cylinder 131 makes its driving plate cylinder slider 1311 perform alternating reciprocating motion backward and forward according to the set stroke, and the driving plate cylinder slider 1311 drives the cylinder slider driving plate 132, and the cylinder slider driving plate 132 drives the slider fixing plate 1351 fixed thereto, and the slider fixing plate 1351 simultaneously drives the sand guide rod to reciprocate the slider 134 and the sand guide rod 135, and at the same time, the sand guide rod 135 drives the sand driving and sand leveling plate 136, so that the coated sand in the sand feeding hopper cavity 121 is smoothly drawn out from the sand feeding hopper sand outlet slot 122, and the coated sand will not accumulate (accumulate) in the sand feeding hopper cavity 121 and affect the sand feeding to the plate curtain type sand carrying mechanism 2, because the coated sand in the sand feeding hopper cavity 121 is driven back and forth by the feeding and driving sand leveling plate 136.

[0033] Please see the key Figure 1The above-mentioned plate curtain type sand loading mechanism 2 includes a left crossbeam support frame 21, a right crossbeam support frame 22, a front crossbeam 23, a rear crossbeam 24, a plate curtain transmission active sprocket 25, a plate curtain transmission driven sprocket 26, a plate curtain 27 and a plate curtain transmission driving device 28. The left crossbeam support frame 21 is supported on the floor at a position corresponding to the bottom of the above-mentioned sand feeding hopper 12, the right crossbeam support frame 22 corresponds to the right side of the left crossbeam support frame 21 and is also supported on the floor, and the front crossbeam 23 and the rear crossbeam 24 are mutually supported. The front and rear sides of the front and rear cross beams 23 and 24 are parallel in the length direction, and the left ends of the front and rear cross beams 23 and 24 are supported and fixed on the top of the aforementioned left support frame 21, and the right ends of the front and rear cross beams 23 and 24 are supported and fixed on the top of the aforementioned cross beam right support frame 22. The spacing between the opposite sides of the front and rear cross beams 23 and 24 is adapted to the width of the plate curtain 27. The number of the plate curtain drive driving sprocket 25 is respectively fixed at the front and rear ends of the plate curtain drive driving sprocket shaft 251 and is located at the front and rear cross beams. The front and rear ends of the plate curtain transmission driving sprocket shaft 251 are rotatably supported at the right ends of the front and rear cross beams 23 and 24 respectively through bearing seats, and the front end of the plate curtain transmission driving sprocket shaft 251 also extends to the front side of the front cross beam 23. The number of the plate curtain transmission driven sprocket 26 is a pair of plate curtain transmission driven sprockets 26, which are respectively fixed at the front and rear ends of the plate curtain transmission driven sprocket shaft 261 and are located between the opposite sides of the front and rear cross beams 23 and 24. The plate curtain transmission The front and rear ends of the driven sprocket shaft 261 are rotatably supported on the left ends of the front and rear cross beams 23 and 24 through bearing seats respectively. The panel curtain 27 is located between the aforementioned front and rear cross beams 23 and 24, and the right end of the panel curtain 27 is sleeved on the aforementioned pair of panel curtain transmission active sprockets 25, and the left end is sleeved on a pair of panel curtain transmission driven sprockets 26. The panel curtain transmission drive device 28 is arranged on the aforementioned cross beam right support frame 22 and is transmission-connected to the aforementioned panel curtain transmission active sprocket shaft 251.

[0034] See also Figure 2a And combined with Figure 1 The above-mentioned panel curtain 27 is composed of a plurality of panels 271, a chain front link 272, a chain rear link 273 and a link hinge shaft 274. The panel curtain 271 is formed on the side of the panel curtain cavity facing the panel curtain 27. Figure 2aA pair of curtain piece hinged ears 2711 and a pair of curtain piece hinged ears 2712 are respectively fixed on the side facing upward in the position state shown in the figure. The pair of curtain piece hinged ears 2711 are fixed on one side of the curtain piece 271, and the pair of curtain piece hinged ears 2711 are respectively provided with hinged ear holes 27111 corresponding to each other in position. The pair of curtain piece hinged ears 2712 are fixed on the other side of the curtain piece 271 in a state corresponding to the pair of curtain piece hinged ears 2711, and the pair of curtain piece hinged ears 2712 are respectively provided with hinged ear holes 27121 corresponding to each other in position. The above-mentioned pair of curtain piece hinges on each of two adjacent curtain pieces 271 The second ear 2712 and the pair of curtain piece hinge ears 2711 are hingedly connected by the aforementioned chain link hinge shaft 274. Each of the aforementioned curtain pieces 271 corresponds to a front chain link 272 and a rear chain link 273, and the front chain link 272 corresponds to the front end of the aforementioned curtain piece 271, and the rear chain link 273 corresponds to the rear end of the curtain piece 271. A curtain piece sealing overlapped step edge 2713 is formed on one side of the length direction of the curtain piece 271 for preventing the coated sand from leaking from the gap between adjacent curtain pieces 271. The curtain piece sealing overlapped step edge 2713 and the edge of one side of the length direction of the adjacent curtain piece 271 are The upper surfaces overlap, the chain link articulation shaft 274 passes through the chain front link chain plate holes on a pair of chain front link chain plates constituting the chain front link 272, the aforementioned articulation ear hole 1 27111, the articulation ear hole 27121, and the chain rear link chain plate holes on a pair of chain rear link chain plates constituting the chain rear link 273, and the chain link articulation shaft front limiting piece is set at the front end of the chain link articulation shaft 274 at a position corresponding to the front side of the aforementioned chain front link 272 to prevent the chain link articulation shaft 274 from moving, and the chain link articulation shaft rear limiting piece is set at the chain link articulation shaft 27 at a position corresponding to the rear side of the aforementioned chain rear link 273. 4, and the chain link hinge shaft 274 is limited to prevent movement. The chain link hinge shaft 274 hinges the front chain link 272, a pair of chain hinge ears 1 2711, a pair of chain hinge ears 2712, and the rear chain link 273 corresponding to each curtain piece 271, so that the plate curtain 27 forms an endless ring structure. The right ends of the front chain and the rear chain formed by the hinge of the front chain link 272 and the rear chain link 273 through the aforementioned chain link hinge shaft 274 are respectively mounted on the aforementioned pair of plate curtain transmission active sprockets 25, and the left ends are respectively mounted on the aforementioned pair of plate curtain transmission driven sprockets 26.

[0035] The above-mentioned typical example of the front and rear limiting parts of the chain link articulated shaft 274 for limiting the front and rear ends to prevent the chain link articulated shaft 274 from moving or even escaping is a retaining spring, which is clamped in retaining spring grooves formed at the front and rear ends of the chain link articulated shaft 274.

[0036] As a preferred solution, in order to prevent the plate curtain 27 from being concave in the middle of the length direction due to the weight of the coated sand, that is, causing the upper surface of the entire plate curtain 27 and the coated sand layer laid thereon to be inconsistent in level, a curtain support strip, a curtain support roller or a similar component can be rotatably arranged in a spaced state between the front and rear cross beams 23 and 24 and at a position corresponding to the plate curtain cavity of the plate curtain 27. This embodiment selects the former, that is, the curtain is supported by the curtain support strip, so that Figure 1 There are four sets of curtain slat support beam fixing screws for fixing the curtain slats. Each set of the four curtain slat support beam fixing screws has a pair (i.e., two). For details, see Figure 1 The front side of the front cross beam 23 shows the fixing screws of the curtain slat support beam. More specifically, the curtain slat support beams for fixing the curtain slats are fixed at intervals between the opposite sides of the front and rear cross beams 23 and 24. The curtain slat support beams and the front and rear cross beams 23 and 24 form a ladder shape composed of a pair of vertical columns and horizontal rails (i.e., "stepping rods") arranged at intervals between the pair of vertical columns. The aforementioned curtain slats (not shown in the figure) are fixed to the middle part of the upper side of the aforementioned curtain slat support beam in a state parallel to the length direction of the front and rear cross beams 23 and 24. The curtain slats can be either a wider one or a pair of relatively narrow ones. In short, the number is not limited by the above description. When the curtain 27 moves with the coated sand and the mold together with the casting in the mold, it can be supported by the curtain slats without sinking or falling.

[0037] The aforementioned panel curtain transmission drive device 28 includes a panel curtain drive motor 281, a panel curtain drive reduction box 282, a panel curtain drive driving wheel 283, a panel curtain drive driven wheel 284 and a panel curtain drive transmission belt 285. The panel curtain drive motor 281 is electrically connected to the electrical control box when in use. The panel curtain drive motor 281 is matched with the panel curtain drive reduction box 282 for transmission and is supported by the panel curtain drive reduction box 282 together with the panel curtain drive motor 281 on the panel curtain drive reduction box support seat 2821. The panel curtain drive reduction box support seat 2821 is provided with a plurality of control units, each of which is provided with a plurality of control units. It is fixed on the support seat fixing plate 28211, and the support seat plate 28211 is fixed on the aforementioned crossbeam right support frame 22, wherein the panel curtain driving reduction box output shaft 2822 of the panel curtain driving reduction box 282 faces forward, the panel curtain driving active wheel 283 is fixed on the panel curtain driving reduction box output shaft 2822, and the panel curtain driving driven wheel 284 is fixed on the aforementioned panel curtain driving sprocket shaft 251, one end of the panel curtain driving transmission belt 285 is sleeved on the panel curtain driving active wheel 283, and the other end is sleeved on the panel curtain driving driven wheel 284.

[0038] In this embodiment, the aforementioned plate curtain driving active wheel 283 and the plate curtain driving driven wheel 284 are sprocket wheels, and accordingly, the aforementioned plate curtain driving transmission belt 285 is a chain. The applicant needs to explain that if only a formal but not substantial change is made, such as using pulleys to replace the plate curtain driving active and driven wheels, and using a transmission belt to replace the chain, then it should be regarded as an equivalent technical means and still falls within the technical connotation of the present invention.

[0039] Preferably, a mold signal collector 29 for collecting the mold signal to be cast placed on the coated sand on the surface of the plate curtain 27 is provided at the upper left end of the aforementioned rear cross beam 24. The mold signal collector 29 is a photoelectric switch, which is electrically connected to the electrical control box when in use. If the aforementioned mold signal collector 29 is provided at the upper left end of the aforementioned front cross beam 23, it should be regarded as an equivalent change.

[0040] Under the operation of the aforementioned panel curtain driving motor 281, the panel curtain driving motor 281 drives the panel curtain driving reduction box 282, and the panel curtain driving reduction box output shaft 2822 of the panel curtain driving reduction box 282 drives the panel curtain driving active wheel 283, which drives the panel curtain driving driven wheel 284 through the panel curtain driving transmission belt 285, and the panel curtain driving driven wheel 284 drives the panel curtain driving active sprocket 25, so that the aforementioned front chain and rear chain, which are respectively formed by the front chain link 272 and the rear chain link 273 of the chain through circular connection (through the chain link hinge shaft) and have one end sleeved on a pair of panel curtain driving active sprockets 25 and the other end sleeved on a pair of panel curtain driving driven sprockets 26, move, and the synchronous movement of the front chain and the rear chain causes the panel curtain 27 to form a transmission plane that moves (i.e., "moves") over and over again.

[0041] See also Figure 3 , since the upper part of the plate curtain 27 is fed by the sand feeding hopper 12 of the structural system of the sand feeding mechanism 1, the coating sand forming process requires a sand layer 10 (according to the mold for casting different products), the online operator can cast the casting to be cast, such as the blade of the structural system of the cyclone used in the dust removal equipment of the steel industry, etc. ( Figure 3 When the position of the mold 20 on the sand layer 10 corresponds to the mold signal collector 29, the mold signal collector 29 feeds back the signal to the electrical control box, and the electrical control box sends a signal to the plate curtain drive motor 281 to stop working. At this time, the corresponding upper and suspended mold 20 is driven by the Figure 3The molten steel (molten iron) in the molten steel ladle 30 is poured into the mold 20. Since the stopping time (delay time) of the plate curtain driving motor 281 is set rhythmically according to the process requirements, and the length of the stopping time of the plate curtain driving motor 281 depends on the size of the casting. When the aforementioned casting is completed, that is, when the delay time is reached, the plate curtain driving motor 281 will work again. When the mold 20 placed on the sand layer 10 by the worker reaches the point where the mold signal collector 29 can collect the signal, the above process is repeated and the molten steel is poured into the mold by the molten steel ladle 30.

[0042] In the above process, the plate curtain 27 carries the sand layer 10 together with the mold 20 that has been cast (the mold 20 has the casting that has been cast) and turns from the right end of the plate curtain 27, that is, at the position of the plate curtain driving sprocket 25, and the sand layer 10 on the plate curtain 27 and the mold 20 with the casting automatically fall to the Figure 3 The vibrating mold-joining and sand-receiving mechanism 4 shown, the coated sand falling on the vibrating mold-joining and sand-receiving mechanism 4 leaks down and is automatically supplied to the coated sand recycling mechanism 6 located on the right side of the vibrating mold-joining and sand-receiving mechanism 4 and is supplied to the aforementioned negative pressure vacuum feeder 3 through the sand storage bin 7 located on the upper right side of the coated sand recycling mechanism 6 through the sand return pipeline 71. The aforementioned mold 20 falling on the vibrating mold-joining and sand-receiving mechanism 4 automatically arrives at the casting output mechanism 5 located between the vibrating mold-joining and sand-receiving mechanism 4 and the coated sand recycling mechanism 6, and is output and demolded by the casting output mechanism 5, and the mold 20 is recycled and reused. Since the structure and working principle of the negative pressure vacuum feeder 3 belong to the well-known technology widely seen in the market, for example, the negative pressure conveying system of powder and granular materials of model YE3 produced by Jianyi Intelligent Equipment Co., Ltd., Xinxiang City, Henan Province, China, which was sold on the market before the present application was filed, can be preferably used but not limited to, so the applicant will not explain it in detail.

[0043] See also Figure 4The coated sand recycling mechanism 6 mentioned above includes a lifting bucket cage 61, a lifting bucket driving motor 62, a lifting bucket driving motor sprocket 63, a lifting bucket driving transmission chain 64, a lifting bucket belt roller shaft driving sprocket 65, a lifting bucket belt roller 66, a lifting bucket belt 67, a lifting bucket belt transition roller 68 and a coated sand transfer device 69. The upper end of the lifting bucket cage 61 extends above the upper floor 40, and a coated sand output cover 611 is provided on the top of the lifting bucket cage 61. The coated sand output cover 611 has a coated sand output port 6111, and the coated sand output port 6111 corresponds to the upper left end of the coated sand transfer device 69. The lower end support of the cage 61 is constructed in the pit 50 on the ground. The bucket driving motor 62 electrically connected to the electrical control box is fixed to the upper left side of the bucket cage 61 through the bucket driving motor seat 621. The bucket driving motor sprocket 63 is fixed to the front end of the bucket driving motor shaft 622 of the bucket driving motor 62. The bucket belt roller 66 is arranged at the upper end of the bucket cage cavity of the bucket cage 61. The bucket belt roller front shaft head 661 and the bucket belt roller rear shaft head of the bucket belt roller 66 are rotatably supported on the front side wall of the bucket cage and the rear side wall of the bucket cage respectively, and the bucket belt roller front shaft head 661 extends to the lifting bucket cage. In front of the front side wall of the bucket cage, the bucket belt roller shaft driving sprocket 65 is fixed on the bucket belt roller front shaft head 661 at a position corresponding to the right side of the bucket driving motor sprocket 63. One end of the bucket driving transmission chain 64 is sleeved on the bucket driving motor sprocket 63, and the other end is sleeved on the bucket belt roller shaft driving sprocket 65. The bucket belt transition roller 68 is arranged at the lower end of the bucket cage cavity of the bucket cage 61. The bucket belt transition roller front shaft head 681 and the bucket belt transition roller rear shaft head of the bucket belt transition roller 68 are rotatably supported on the bucket cage front side wall and the bucket cage rear side wall of the bucket cage 61 respectively. The upper end of the bucket belt 67 is sleeved on the lifting bucket belt roller 66, and the lower end is sleeved on the lifting bucket belt transition roller 68. On the lifting bucket belt 67 and on the outer side of the lifting bucket belt 67, coated sand retrieval buckets 671 are arranged in parallel with each other in a spaced state. The coated sand transfer device 69 is arranged on the aforementioned floor 40 at a position corresponding to between the aforementioned coated sand outlet 6111 and the sand storage bin 7 and is communicated with the sand storage bin 7. Among them, a lifting bucket cage coated sand inlet 612 is arranged on the left side of the lower end of the aforementioned lifting bucket cage 61, which protrudes out of the left side wall of the lifting bucket cage 61; a sand storage bin dust hood 72 is arranged above the sand storage bin 7;The right end of the aforementioned vibrating mold and sand receiving mechanism 4 corresponds to the aforementioned lifting bucket cage coated sand inlet 612, and a coated sand outlet dust cover 60 is arranged between the aforementioned coated sand outlet 6111 and the left end of the aforementioned coated sand transfer device 69. The coated sand from the coated sand outlet 6111 passes through the coated sand outlet dust cover 60 and then falls to the aforementioned coated sand transfer device 69 and is sent into the aforementioned sand storage bin 7 by the coated sand transfer device 69. As a preferred solution, a bucket belt tensioning roller 613 for tensioning the bucket belt 67 can be rotatably arranged in an interval state in the height direction of the bucket cage cavity of the bucket cage 61, and the bucket belt tensioning roller shaft 6131 of the bucket belt tensioning roller 613 is arranged in an S-shaped staggered state at intervals, and the front and rear ends of the bucket belt tensioning roller shaft 6131 of the bucket belt tensioning roller 613 are rotatably supported on the bucket tensioning roller shaft support seat 61311 arranged on the front and rear outer walls of the bucket cage 61. ;

[0044] See also Figure 5 And combined with Figure 3 ,exist Figure 5The vibrating mold-sand receiving mechanism 4 and the casting output mechanism 5, which are located at the right end of the plate curtain 27 of the structural system of the plate curtain type sand carrying mechanism 2 mentioned above, are shown in the figure. The vibrating mold-sand receiving mechanism 4 corresponds to the top of the pit 50, wherein the vibrating mold-sand receiving mechanism 4 includes a coated sand hollow grid frame 41, a vibration box 42, a spring 43 and a vibrator 44. The front and rear sides of the coated sand hollow grid frame 41 are supported on the spring 43 through a spring support seat 411. The left end of the coated sand hollow grid frame 41 is connected to the right end of the aforementioned front crossbeam 23 and the rear crossbeam 24 and maintains a height difference lower than the right end of the aforementioned plate curtain 27. The right end of the coated sand hollow grid frame 41 is connected to the left side of the front end of the aforementioned casting output mechanism 5. The vibration box 42 is located below the coated sand hollow grid frame 41. The left end of the vibration box 42 is fixed to the right side of the aforementioned crossbeam right support frame 22, and the right end is fixed to the lower end of the aforementioned lifting bucket cage 61. The left end is connected, and at the right end of the vibration box 42 and at a position above the coated sand inlet 612 of the aforementioned lifting bucket cage, there is a vibration box coated sand outlet 422 for leading out the coated sand that leaks (flows) from the coated sand hollow grid frame 41 and enters the vibration box cavity 421 of the vibration box 42. The number of springs 43 is arranged in a group corresponding to the front and rear sides of the vibration box 42, and each group has at least one pair. The lower end of the spring 43 is positioned on a spring fixed support seat 431, the spring fixed support seat 431 corresponding to the front side of the vibration box 42 is fixed on the front side wall of the vibration box 42 (i.e., the "front box wall"), and the spring fixed support seat 431 corresponding to the rear side of the vibration box 42 is fixed on the rear side wall of the vibration box 42 (i.e., the "rear box wall"), the upper end of the spring 43 is fixed to the aforementioned spring support seat 411, and the vibrator 44 electrically controlled by the electrical control box is arranged on the front side wall or the rear side wall of the vibration box 42. Wherein, a coated sand hollow grille dust cover 70 is provided above the coated sand hollow grille frame 41 .

[0045] Depend on Figure 3The mold 20 that has completed casting as shown, together with the casting, automatically falls from the right end of the plate curtain 27 onto the hollow grid frame 41 for coated sand. Under the vibration of the vibrator 44, the hollow grid frame 41 for coated sand vibrates the coated sand off the mold 20 and its casting and flows downward into the vibration box cavity 421, and is introduced into the coated sand inlet 612 of the lifting bucket cage through the coated sand outlet 422 of the vibration box. Under the operation of the bucket driving motor 62 of the coated sand recycling mechanism 6, the bucket driving motor sprocket 63 is driven by the bucket driving motor shaft 622, and the bucket belt roller shaft driving sprocket 65 is driven by the bucket driving transmission chain 64, and the bucket belt roller shaft driving sprocket 65 drives the bucket belt roller shaft 651, and the bucket belt roller shaft 651 drives the bucket belt roller 66, and the bucket belt roller 66 drives the bucket belt 67. In the process of the bucket belt 67 moving around the bucket belt roller 66 and the bucket belt transition roller 68, the coated sand extracting bucket 671 (i.e., "coated sand extraction bucket") extracts the coated sand introduced by the coated sand inlet 612 of the bucket cage, and transports it to the coated sand transfer device 69 through the coated sand output port 6111 of the coated sand output cover 611 (also called "coated sand output box") through the aforementioned coated sand output port dust removal cover 60, and the coated sand transfer device 69 is transported to the coated sand by the transfer conveyor belt of the coated sand transfer device 69. Figure 3 The sand storage bin 7 shown is then transported to the aforementioned negative pressure vacuum loader 3 through the sand return pipeline 71, and then supplied to the sand feeding hopper 12 of the sand feeding mechanism 1 by the aforementioned hose 31, and fed to the plate curtain 27 of the plate curtain type sand carrying mechanism 2 by the sand feeding hopper sand outlet 122, so that the coated sand is circulated.

[0046] See you next time Figure 5 And combined with Figure 3 In the above process, after the coated sand is shaken off the coated sand hollow grid frame 41, the mold together with the casting automatically falls from the right end of the coated sand hollow grid frame 41 to the casting output mechanism 5 (because the coated sand hollow grid frame 41 is slightly inclined toward the casting output mechanism 5). Figure 5 As shown, the casting output mechanism 5 and the right end of the coated sand hollow grid frame 41 maintain a height difference lower than the coated sand hollow grid frame 41. Figure 5 As shown, the front end of the casting output mechanism 5 is supported between the right end of the coated sand hollow grid frame 41 and the left side of the lifting bucket cage 61 through the front bracket, and the rear end is supported on the ground through the rear bracket. Since the structure and working principle of the casting output mechanism 5 are basically the same as those of the aforementioned plate curtain type sand carrying mechanism 2, the applicant will not repeat them. According to professional common sense, the mold output by the casting output mechanism 5 is reused after the casting is removed, and the casting is sent to the subsequent process. In addition, Figure 3 Also shown is a dust extraction hood 80 corresponding to the upper side of the casting discharging mechanism 5 .

[0047] In summary, the technical solution provided by the present invention makes up for the shortcomings of the existing technology, successfully completes the invention task, and faithfully realizes the technical effects stated by the applicant in the technical effect column above.

Claims

1. A device for laying coated sand for casting, characterized in that: The invention comprises a sand feeding mechanism (1) and a plate curtain type sand carrying mechanism (2) for receiving and carrying coated sand fed by the sand feeding mechanism (1). The sand feeding mechanism (1) is supported on the floor of a casting site when in use. The left end of the plate curtain type sand carrying mechanism (2) extends to the sand feeding mechanism (1), while the right end is also supported on the floor of the casting site.

2. The device for laying coated sand for casting according to claim 1, characterized in that: The sand feeding mechanism (1) comprises a sand feeding hopper support frame (11), a sand feeding hopper (12) and a sand uniforming and guiding device (13). The sand feeding hopper support frame (11) is supported on the floor of a casting site when in use. The sand feeding hopper (12) is arranged on the top of the sand feeding hopper support frame (11) through a sand feeding hopper fixing block (123). The upper part of the sand feeding hopper (12) is open, and the lower part and along the length direction of the sand feeding hopper (12) are provided with a slot for moving the sand feeding hopper (12) ) is led out of the coated sand in the sand feeding hopper cavity (121) of the sand feeding hopper, and the sand uniforming and guiding device (13) is arranged on the upper right side of the sand feeding hopper (12) in the length direction; the left end of the plate curtain type sand loading mechanism (2) extends to the middle of the height direction of the sand feeding hopper support frame (11) at a position corresponding to the bottom of the sand feeding hopper (12), and the coated sand coming out of the sand feeding hopper sand outlet slot (122) is received by the left end of the plate curtain type sand loading mechanism (2).

3. The device for laying coated sand for casting according to claim 2, characterized in that: The sand feeding hopper sand outlet slot (122) is formed by a space with a width of 0.5-1.5 cm formed between the lower portion of the left side wall of the sand feeding hopper (12) in the length direction and the lower portion of the right side wall of the sand feeding hopper (12).

4. The device for laying coated sand for casting according to claim 3, characterized in that: The sand-distributing and sand-distributing device (13) comprises a driving plate cylinder (131), a cylinder slider driving plate (132), a sand-distributing rod reciprocating slider guide rail (133), a sand-distributing rod reciprocating slider (134), a sand-distributing rod (135) and a sand-distributing and sand-distributing plate (136). The front end and the rear end of the driving plate cylinder (131) are respectively supported and fixed on a driving plate cylinder seat (1312), and the driving plate cylinder seat (1312) is fixed on the sand feeding hopper (131). The sand feeding hopper of the sand feeding hopper (12) is located at the upper part of the right side wall thereof facing away from the sand feeding hopper cavity (121), the cylinder slider driving plate (132) is fixed to the driving plate cylinder slider (1311) of the driving plate cylinder (131), the sand guide rod reciprocating slider guide rail (133) corresponds to the upper part of the right side wall of the sand feeding hopper of the sand feeding hopper (12) facing the sand feeding hopper cavity (121), and the rear end of the sand guide rod reciprocating slider guide rail (133) is aligned with the rear side of the sand feeding hopper (12). The upper edge of the wall is fixed, and the front end is fixed to the upper edge of the front side wall of the sand feeding hopper (12). The sand guide rod reciprocating slider (134) is slidably matched with the sand guide rod reciprocating slider guide rail (133) through its slider groove (1341). The upper end of the sand guide rod (135) is formed with a slider fixing plate (1351) bent toward the direction of the sand guide rod reciprocating slider (134). The slider fixing plate (1351) and the sand guide rod reciprocating slider (134) are connected to the upper side of the sand guide rod reciprocating slider (134). The lower end of the sand guide rod (135) extends downward in a longitudinal cantilever state to the position of the sand outlet slot (122) of the sand feeding hopper. The sand driving and sand leveling plate (136) is fixed to the left side of the sand guide rod (135) in a longitudinal state and forms a vertical relationship with the left side of the sand guide rod (135). The bottom of the sand driving and sand leveling plate (136) corresponds to the upper side of the sand outlet slot (122) of the sand feeding hopper while maintaining a distance from the sand outlet slot (122) of the sand feeding hopper.

5. The device for laying coated sand for casting according to claim 4, characterized in that: The driving plate action cylinder (131) is a rodless cylinder; the cross-sectional shape of the reciprocating slider guide rail (133) of the sand guide rod is dovetail-shaped, and the cross-sectional shape of the slider groove (1341) is also dovetail-shaped; the rodless cylinder is a rodless cylinder that works forward and backward.

6. The device for laying coated sand for casting according to claim 2, characterized in that: The plate curtain type sand carrying mechanism (2) comprises a left crossbeam support frame (21), a right crossbeam support frame (22), a front crossbeam (23), a rear crossbeam (24), a plate curtain transmission active sprocket (25), a plate curtain transmission driven sprocket (26), a plate curtain (27) and a plate curtain transmission driving device (28), wherein the left crossbeam support frame (21) is supported on the ground at a position corresponding to the lower side of the sand feeding hopper (12), the right crossbeam support frame (22) corresponds to the right side of the left crossbeam support frame (21) and is also supported on the ground, and the front crossbeam (23) is supported on the ground at a position corresponding to the lower side of the sand feeding hopper (12). The front and rear cross beams (23, 24) are parallel to each other in the longitudinal direction, and the left ends of the front and rear cross beams (23, 24) are supported and fixed on the top of the left support frame (21), while the right ends of the front and rear cross beams (23, 24) are supported and fixed on the top of the right cross beam support frame (22), and the spacing between the opposite sides of the front and rear cross beams (23, 24) is adapted to the width of the plate curtain (27), and the number of the plate curtain drive driving sprockets (25) is respectively fixed to the front end and the rear end of the plate curtain drive driving sprocket shaft (251) and is located A pair of plate curtain drive sprockets (251) are respectively fixed at the front and rear ends of the plate curtain drive driven sprocket shaft (261) and are located between the opposite sides of the front and rear cross beams (23, 24). The front end and rear end of the plate curtain drive driven sprocket shaft (251) are respectively supported by the right ends of the front and rear cross beams (23, 24) through bearing seats, and the front end of the plate curtain drive driven sprocket shaft (251) also extends to the front side of the front cross beam (23). The number of plate curtain drive driven sprockets (26) is a pair of plate curtain drive driven sprockets (26) respectively fixed at the front and rear ends of the plate curtain drive driven sprocket shaft (261) and are located between the opposite sides of the front and rear cross beams (23, 24). The front and rear ends of the transmission driven sprocket shaft (261) are rotatably supported on the left ends of the front and rear cross beams (23, 24) respectively through bearing seats, the plate curtain (27) is located between the front and rear cross beams (23, 24), and the right end of the plate curtain (27) is sleeved on the pair of plate curtain transmission active sprockets (25), while the left end is sleeved on the pair of plate curtain transmission driven sprockets (26), and the plate curtain transmission drive device (28) is arranged on the right support frame (22) of the cross beam and is transmission-connected to the plate curtain transmission active sprocket shaft (251).

7. The device for laying coated sand for casting according to claim 6, characterized in that: The plate curtain (27) is composed of a plurality of curtain pieces (271), a front chain link (272), a rear chain link (273) and a chain link hinge shaft (274). A pair of curtain piece hinge ears (2711) and a pair of curtain piece hinge ears (2712) are respectively fixed on one side of the curtain piece (271) facing the plate curtain cavity of the plate curtain (27). The pair of curtain piece hinge ears (2711) are fixed on one side of the curtain piece (271), and the pair of curtain piece hinge ears (2711) are respectively provided with hinge ear holes (27111) corresponding to each other in position. The pair of curtain piece hinge ears (2712) are fixed on the other side of the curtain piece (271) in a state corresponding to the pair of curtain piece hinge ears (2711), and the pair of curtain piece hinge ears (2712) are respectively fixed on the other side of the curtain piece (271) in a state corresponding to the pair of curtain piece hinge ears (2711), and the pair of curtain piece hinge ears (2712) are respectively fixed on the other side of the curtain piece (271) in a state corresponding to the pair of curtain piece hinge ears (2711). 2) are each provided with two hinged ear holes (27121) at positions corresponding to each other, the pair of curtain piece hinged ears (2712) and the pair of curtain piece hinged ears (2711) on each of the two adjacent curtain pieces (271) are hingedly connected by the chain link hinge shaft (274), each of the curtain pieces (271) corresponds to a front chain link (272) and a rear chain link (273), and the front chain link (272) corresponds to the front end of the curtain piece (271), and the rear chain link (273) corresponds to the rear end of the curtain piece (271), and a curtain piece sealing overlapped step edge (2713) is formed on one side of the curtain piece (271) in the length direction for preventing the coated sand from leaking from the gap between the adjacent curtain pieces (271), the curtain piece The overlapping step edge (2713) of the sheet sealing seam coincides with the upper surface of the edge portion of one side in the length direction of the adjacent curtain sheet (271); the chain link hinge shaft (274) passes through the chain front link chain sheet holes on a pair of chain front link chain sheets constituting the chain front link (272), the hinge ear hole 1 (27111), the hinge ear hole 2 (27121) and the chain rear link chain sheet holes on a pair of chain rear link chain sheets constituting the chain rear link (273); and the chain link hinge shaft front limiting piece is arranged at the front end of the chain link hinge shaft (274) at a position corresponding to the front side of the chain front link (272) to prevent the chain link hinge shaft (274) from moving; and the chain link hinge shaft rear limiting piece is arranged at the rear end of the chain rear link (273) to prevent the chain link hinge shaft (274) from moving. The side position is arranged at the rear end of the chain link hinge shaft (274) to prevent the chain link hinge shaft (274) from moving. The chain link hinge shaft (274) hinges the front chain link (272) of the chain corresponding to each curtain piece (271), a pair of chain piece hinge ears one (2711), a pair of chain piece hinge ears two (2712) and the rear chain link (273) of the chain to make the panel curtain (27) form an endless ring structure. The right ends of the front chain and the rear chain formed by the front chain link (272) and the rear chain link (273) of the chain hinged by the chain link hinge shaft (274) are respectively mounted on the pair of panel curtain transmission active sprockets (25), and the left ends are respectively mounted on the pair of panel curtain transmission driven sprockets (26).

8. The device for laying coated sand for casting according to claim 6, characterized in that: The panel curtain drive drive device (28) comprises a panel curtain drive motor (281), a panel curtain drive reduction box (282), a panel curtain drive driving wheel (283), a panel curtain drive driven wheel (284) and a panel curtain drive transmission belt (285). The panel curtain drive motor (281) is electrically connected to the electrical control box when in use. The panel curtain drive motor (281) is in transmission cooperation with the panel curtain drive reduction box (282) and is supported by the panel curtain drive reduction box (282) together with the panel curtain drive motor (281) on a panel curtain drive reduction box support seat (2821). The panel curtain drive reduction box support seat (2821) is The plate curtain drive reduction box (2822) of the plate curtain drive reduction box (282) faces forward, the plate curtain drive driving wheel (283) is fixed on the plate curtain drive reduction box output shaft (2822), and the plate curtain drive driven wheel (284) is fixed on the front end of the plate curtain drive driving sprocket shaft (251), one end of the plate curtain drive transmission belt (285) is sleeved on the plate curtain drive driving wheel (283), and the other end is sleeved on the plate curtain drive driven wheel (284).

9. The device for laying coated sand for casting according to claim 8, characterized in that: The plate curtain driving active wheel (283) and the plate curtain driving driven wheel (284) are sprocket wheels or belt pulleys, and the plate curtain driving transmission belt (285) is a chain or a belt.

10. The device for laying coated sand for casting according to claim 6, characterized in that: A mold signal collector (29) is provided at the upper left end of the front crossbeam (23) or the rear crossbeam (24) for collecting signals of a mold to be cast placed on the coated sand on the surface of the plate curtain (27). The mold signal collector (29) is a photoelectric switch which is electrically connected to an electrical control box when in use.

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