A multifunctional sand conveying device for sand paving device of sand mold 3D printer

Abstract

The present invention provides a multifunctional sand conveying device for a sand paving device of a sand mold 3D printer, which relates to the technical field of sand mold 3D printing. The device comprises a sand storage bin, an upper sand hopper, a motor, a screw conveying shaft, and a buffer plate. The multifunctional sand conveying device for a sand paving device of a sand mold 3D printer compacts the sand at the lower sand opening at the bottom of the sand storage bin whenever sand enters the sand storage bin from the upper sand hopper, causing the sand below the upper sand hopper to be more compact than the rest of the sand in the sand storage bin, thereby affecting the uniformity of sand discharge. A buffer plate is installed below the upper sand hopper, with a gap between the free end of the buffer plate and the inner wall of the other side of the sand storage bin, so that the sand can fall to the bottom. When the sand enters the sand storage bin from the upper sand hopper, it is first buffered by the buffer plate and then slides to the lower sand opening through the inner wall of the sand storage bin, thereby avoiding the phenomenon that the sand below the upper sand hopper is more compact than the rest of the sand in the sand storage bin, thereby achieving the purpose of uniform sand state in the sand storage bin, thereby ensuring uniform sand discharge.

Description

Technical Field

[0001] The present invention relates to the technical field of sand mold 3D printing, and in particular to a multifunctional sand conveying device for a sand mold 3D printer sand paving device. Background Art

[0002] The sand spreading mechanism of a sand mold 3D printer is a key component used to transport sand from the sand storage bin to the print area. Its function is to ensure that the sand is evenly spread onto the print platform, forming each layer of the sand mold and achieving precise sand accumulation according to design requirements. It also ensures consistent flow and compaction of the sand during the spreading process. In a sand mold 3D printer, sand enters the sand storage bin through the upper sand hopper, which then transports it to the sand spreading mechanism for spreading. The sand storage bin typically uses gravity to move the sand to the lower sand outlet.

[0003] In existing sand conveying devices, when sand enters the sand storage bin from the upper sand hopper, the sand at the bottom of the bin is impacted by the gravity of the sand above. As the sand continues to accumulate, the sand layer near the lower sand outlet is subjected to greater pressure, compressing the gaps between the sand grains and achieving significantly higher compaction than other areas of the bin. This uneven compaction leads to inconsistent flowability of the sand when it is delivered to the sand spreading device, which in turn affects the uniformity of the sand spreading. Summary of the Invention

[0004] The present invention provides a multifunctional sand conveying device for a sand paving device of a sand mold 3D printer, which solves the problem proposed in the above background technology that uneven compaction will lead to inconsistent fluidity of sand when it is transported to the sand paving device, thereby affecting the uniformity of sand paving.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a multifunctional sand conveying device for a sand mold 3D printer sand paving device, comprising a sand storage bin, a sand hopper, a motor and a spiral conveying shaft, wherein the sand hopper is arranged at the feed opening of the sand storage bin, the motor is fixed at one end of the sand storage bin, one end of the spiral conveying shaft is fixedly connected to the output shaft of the motor, and further comprises a buffer plate, which is arranged below the spiral conveying shaft, and the buffer plate is obliquely installed on the inner side wall of the sand storage bin, and a channel is provided between the free end of the buffer plate and the inner wall on the other side of the sand storage bin, and the height of the free end of the buffer plate is lower than the height of the fixed end.

[0006] Preferably, the sand storage bin includes an upper bin portion and a lower bin portion, the upper bin portion is arranged at the upper end of the lower bin portion, the upper bin portion includes a front side wall, a rear side wall and a connecting wall, the front side wall and the rear side wall are vertical and parallel to each other, the front side wall and the rear side wall are surrounded by two connecting walls to form a fully enclosed frame, the two connecting walls are arranged in parallel, the connecting wall and the front side wall are perpendicular to each other, the bottom opening of the lower bin portion is bent inwardly, the bottom opening of the lower bin portion and the horizontal projection position of the lowest point of the free end of the buffer plate do not coincide, the bottom opening of the lower bin portion is close to the front side wall, the upper end opening size of the upper sand hopper is larger than the lower end opening size, the side wall of the upper sand hopper on the same side as the front side wall is an inclined surface and the angle between it and the front side wall is an obtuse angle, the opposite side wall of the inclined side wall of the upper sand hopper and the rear side wall are in the same plane, and the angle between the buffer plate and the front side wall is smaller than the angle between the inclined side wall of the upper sand hopper and the front side wall.

[0007] Preferably, the length extension direction of the spiral conveying shaft is perpendicular to the connecting wall, the spiral conveying shaft is located in the plane where the connecting wall is located and close to the front side wall, and a plurality of stirring sand material blades are fixed on the main shaft of the spiral conveying shaft, and the plurality of stirring sand material blades are evenly arranged along the spiral direction of the spiral blades of the spiral conveying shaft.

[0008] Preferably, a bin cover is rotatably connected above the sand storage bin, the bin cover is located on one side of the upper sand hopper, a sensor bracket is provided below the bin cover, the sensor bracket includes an upper support plate and a lower support plate, the lower support plate is fixed on the connecting wall, and the upper support plate is fixed on the upper side of the lower support plate.

[0009] An arc-shaped U-shaped hole is provided on the side surface of the lower support plate, and two straight U-shaped holes are provided on the end surface of the upper support plate.

[0010] Preferably, a bending plate is fixed to one end of the buffer plate, and the bending plate is fixed parallel to the front side wall, and an angle of ≥135° is set between the buffer plate and the bending plate.

[0011] Preferably, a slot is obliquely provided on one side wall of the front side wall, an outward extension plate is provided below the slot, the outward extension plate is arranged parallel to the slot, a support plate assembly is provided on one side of the sand storage bin, the support plate assembly and the slot are located on the same side, the support plate assembly includes a support rod, a cross bar and a guide member, one end of the support rod is rotatably connected to the side wall of the sand storage bin, a hydraulic cylinder 1 is provided below the support rod, the hydraulic cylinder 1 and the sand storage bin are rotatably connected, the output shaft of the hydraulic cylinder 1 abuts the lower end of the support rod, the cross bar is fixed to the free end of the support rod, a positioning plate is fixedly connected to the support rod, and the positioning plate is arranged perpendicular to the support rod.

[0012] Preferably, guide members are provided at both ends of the cross bar, and the guide members include a plate clamp and a roller. A clamping groove is provided on one side of the plate clamp, and an inner groove is provided at the bottom of the clamping groove. The clamping groove is connected to the inner groove, and the plate clamps on both sides are symmetrically arranged. A plurality of rollers are arranged inside the inner groove along the length direction. The buffer plate is inserted into the clamping groove, and both sides of the buffer plate abut against the rollers.

[0013] Preferably, both sides of the support rod are provided with a limit assembly, and the two groups of limit assemblies are symmetrically arranged, and the limit assembly includes a guide sleeve, a sliding column, an end block and an upper top block, the guide sleeve is fixed to the cross bar, one end of the guide sleeve is provided with an opening, and the opening is located on the side away from the support rod, the inside of the guide sleeve is provided with a sliding groove, and the closed end surface of the guide sleeve is provided with a sliding hole, the sliding column is slidably connected to the inside of the sliding hole, one end of the sliding column is an arc surface, and the other end of the sliding column is fixedly connected to the end block, the upper surface of the end block is an inclined surface, and the end block is The slide grooves are connected in a sliding manner, the upper surface of the guide sleeve is open, the lower surface of the upper push block is an inclined surface, the lower surface of the upper push block is fitted with the upper surface of the end block, the upper push block slides normally along the buffer plate inside the slide groove, a side plate is vertically provided inside the slide groove, one side of the upper push block abuts against the side plate, a spring is provided on the outer peripheral side of the slide column, a top plate is fixed on the slide column, one end of the spring abuts against the top plate, and the other end of the spring abuts against the guide sleeve, and the upper end of the upper push block is fixedly connected to a clamp.

[0014] Preferably, two lower holes are provided through the upper surface of the buffer plate, an upper hole is provided on one side of the lower hole, the upper hole and the lower hole are provided in a colinear manner, the upper hole is close to the side edge of the buffer plate, a slide rail is fixedly connected to the center position of the lower surface of the buffer plate, an inner support member is slidably connected to the slide rail, two threaded holes are provided on the lower surface of the slide rail, the two threaded holes are respectively on the same horizontal line with the upper hole and the lower hole, and the inner support member is fixed in the threaded hole by screws.

[0015] Preferably, a pushing member is provided above the cross bar, and the pushing member includes an upper beam and a second hydraulic cylinder. The two ends of the upper beam are respectively fixed on the plate jacket. The second hydraulic cylinder is provided on the upper beam. An upper plate is provided above the buffer plate. The upper plate is slidably connected in the slot. The upper plate is fixed on the output shaft of the second hydraulic cylinder. The second hydraulic cylinder pushes the upper plate to slide above the buffer plate.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The sand is first buffered by the buffer plate, and then slides to the lower sand opening through the inner wall of the sand storage bin, thus avoiding the phenomenon that the compactness of the sand below the upper sand hopper is greater than that of the sand in other positions of the sand storage bin, thereby achieving the purpose of the same sand state in the sand storage bin, so that the sand can be discharged evenly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural diagram of the multifunctional sand conveying device of the sand paving device of the sand mold 3D printer of the present invention;

[0019] Figure 2 This is a structural diagram of the installation position of the buffer plate in the first embodiment of the present invention;

[0020] Figure 3 Schematic diagram of the spiral stirring shaft structure of the present invention;

[0021] Figure 4 This is a structural diagram of the installation position of the sensor bracket of the present invention;

[0022] Figure 5 for Figure 4 A magnified view of point A;

[0023] Figure 6 A schematic diagram of the structure of the slot opening position of the present invention;

[0024] Figure 7 This is a structural diagram of embodiment 2 of the present invention;

[0025] Figure 8 This is a structural schematic diagram of the installation position of the support plate assembly of the present invention;

[0026] Figure 9 It is a side view of the second embodiment of the present invention;

[0027] Figure 10 This is a structural schematic diagram of the guide sleeve installation position of the present invention;

[0028] Figure 11 It is a schematic structural diagram of the slide rail and the inner support member of the present invention;

[0029] Figure 12 for Figure 11 Enlarged view of point B;

[0030] Figure 13 This is a schematic diagram of the cooperation between the inner support member and the limiting assembly in the second embodiment of the present invention;

[0031] Figure 14 for Figure 13 Enlarged view of point C;

[0032] Figure 15 This is a schematic diagram of the buffer plate of the present invention being fixed by a limiting assembly;

[0033] Figure 16 This is a schematic diagram of the structure of the buffer plate of the present invention;

[0034] Figure 17 This is a schematic structural diagram of a pusher in the second embodiment of the present invention;

[0035] Figure 18 This is a structural schematic diagram of the upper plate in a fully sealed state in the second embodiment of the present invention;

[0036] Figure 19 This is a structural diagram of the upper plate in the open state in the second embodiment of the present invention.

[0037] Reference numerals in the figure: 1, sand storage bin; 11, upper bin; 12, lower bin; 111, front side wall; 1111, slot; 1112, extension plate; 112, rear side wall; 113, connecting wall; 13, bin cover; 2, upper sand hopper; 3, motor; 31, screw conveyor shaft; 311, sand turning blade; 32, bearing sleeve; 4, support plate assembly; 41, support rod; 411, hydraulic cylinder 1; 412, positioning plate; 42, cross bar; 43, guide member; 431, plate clamp; 4311, clamping groove; 431 2. Inner groove; 432. Roller; 5. Limiting assembly; 51. Guide sleeve; 511. Slide groove; 5111. Side plate; 512. Slide hole; 52. Slide column; 521. Spring; 522. Top plate; 53. End block; 54. Upper top block; 541. Clamp; 6. Buffer plate; 61. Lower hole; 62. Upper hole; 63. Slide rail; 631. Threaded hole; 64. Inner support; 7. Pusher; 71. Upper beam; 72. Hydraulic cylinder 2; 8. Upper plate; 9. Sensor bracket; 91. Upper support plate; 92. Lower support plate. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The present invention takes the direction of working movement of the device as the front. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0039] The invention provides a multifunctional sand conveying device for a sand paving device of a sand mold 3D printer.

[0040] Specific embodiment 1:

[0041] like Figure 1 and Figure 2 As shown, it includes a sand storage bin 1, an upper sand hopper 2, a motor 3, a spiral conveying shaft 31 and a buffer plate 6. The upper sand hopper 2 is arranged at the feed opening of the sand storage bin 1, the motor 3 is fixed at one end of the sand storage bin 1, and a bearing sleeve 32 is provided at one end of the sand storage bin 1. One end of the spiral conveying shaft 31 is fixedly connected to the output shaft of the motor 3, and the other end is connected to the bearing sleeve 32 and fixed on the inner ring of the bearing sleeve 32. The motor 3 provides power for the spiral conveying shaft 31 to convey sand. The buffer plate 6 is arranged below the spiral conveying shaft 31. The buffer plate 6 is obliquely installed on the inner wall of the sand storage bin 1. A channel is provided between the free end of the buffer plate 6 and the inner wall of the other side of the sand storage bin 1. The height of the free end of the buffer plate 6 is lower than the height of the fixed end.

[0042] like Figure 2As shown, the sand storage bin 1 includes an upper bin portion 11 and a lower bin portion 12, the upper bin portion 11 is arranged at the upper end of the lower bin portion 12, the upper bin portion 11 includes a front side wall 111, a rear side wall 112 and a connecting wall 113, the front side wall 111 and the rear side wall 112 are vertical and parallel to each other, the front side wall 111 and the rear side wall 112 are surrounded by two connecting walls 113 to form a fully enclosed frame, the two connecting walls 113 are arranged in parallel, the connecting wall 113 and the front side wall 111 are perpendicular to each other, the bottom opening of the lower bin portion 12 is bent inward, and the bottom of the lower bin portion 12 The horizontal projection position of the opening and the lowest point of the free end of the buffer plate 6 does not coincide with each other. The bottom opening of the lower bin 12 is close to the front side wall 111. The upper end opening size of the upper sand hopper 2 is larger than the lower end opening size. The side wall of the upper sand hopper 2 on the same side as the front side wall 111 is an inclined surface and the angle between it and the front side wall 111 is an obtuse angle. The side wall opposite to the inclined side wall of the upper sand hopper 2 is located in the same plane as the rear side wall 112. The angle between the buffer plate 6 and the front side wall 111 is smaller than the angle between the inclined side wall of the upper sand hopper 2 and the front side wall 111. A bent plate is fixed to one end of the buffer plate 6, and the bent plate is fixed parallel to the front side wall 111. An angle of ≥135° is set between the buffer plate 6 and the bent plate.

[0043] The length extension direction of the spiral conveying shaft 31 is perpendicular to the connecting wall 113. The spiral conveying shaft 31 is located in the plane where the connecting wall 113 is located and close to the front side wall 111. The offset setting of the spiral conveying shaft 31 helps to improve the flow of materials, especially when the conveying materials are dense or have high viscosity, to avoid accumulation or blockage of materials during the conveying process. Preferably, Figure 3 As shown, a plurality of sand stirring blades 311 are fixed to the main shaft of the spiral conveying shaft 31, and the plurality of sand stirring blades 311 are evenly arranged along the spiral direction of the spiral blades of the spiral conveying shaft 31. During the process of conveying sand in the sand storage bin 1, the sand can be repeatedly stirred to effectively prevent the sand from agglomerating.

[0044] like Figure 4 and Figure 5As shown, a bin cover 13 is rotatably connected above the sand storage bin 1, and the bin cover 13 is located on one side of the upper sand hopper 2. A sensor bracket 9 is provided below the bin cover 13, and the sensor bracket 9 includes an upper support plate 91 and a lower support plate 92. The lower support plate 92 is fixed to the connecting wall 113 with screws, and the upper support plate 91 is fixed to the upper end of the lower support plate 92. An arc-shaped U-shaped hole is provided on the side surface of the lower support plate 92, and two straight U-shaped holes are provided on the end face of the upper support plate 91. The straight U-shaped hole is used to fix the sensor, and the bin cover 13 is provided with a through hole at the corresponding position of the sensor bracket 9, leaving installation space for the sensor. The sensor can slide vertically along the straight U-shaped hole to adjust the sensing height of the sensor, and sense the remaining sand material in the sand storage bin 1. When the sand material in the sand storage bin 1 is full, the sensor will be triggered and give a prompt. The arc-shaped U-shaped hole is the connecting hole between the sensor bracket 9 and the sand storage bin 1. The connection position of the lower support plate 92 of the sensor bracket 9 and the sand storage bin 1 is fixed and both are fixed with screws. The screws at the upper connection are inserted into the arc-shaped U-shaped hole, and the screws at the lower connection are located at the center position of the arc-shaped U-shaped hole. When the screws at the upper and lower connections are loosened, the sensor bracket 9 can be rotated to adjust the position of the upper connection screw in the arc-shaped U-shaped hole, and the inclination angle of the sensor bracket 9 can be adjusted. Then the screws at the upper and lower connections are tightened so that the lower support plate 92 is fastened to the connecting wall 113, thereby realizing the function of adjusting the height of the sensor, and ensuring that the sensor can accurately sense the remaining sand material.

[0045] The sensor can be a distance sensor such as a travel switch.

[0046] The sand enters from the upper opening of the upper sand hopper 2, slides along the inclined side wall of the upper sand hopper 2 into the sand storage bin 1, and after being buffered by the buffer plate 6, flows along the surface of the buffer plate 6 from the channel between the buffer plate 6 and the sand storage bin 1 to the inclined surface of the lower bin 12 on the opposite side, and then falls to the bottom of the sand storage bin 1, which is located directly below the upper sand hopper 2. When the sand accumulates to the height of the spiral conveying shaft 31, the motor 3 is started to drive the spiral conveying shaft 31 to rotate, pushing the sand in contact with the spiral conveying shaft 31 forward, and the forward-moving sand falls to the bottom of the sand storage bin 1 and accumulates, and so on, until the sand storage bin 1 is filled. This avoids the phenomenon that the compactness of the sand below the upper sand hopper 2 is greater than the compactness of the rest of the sand in the sand storage bin 1, and achieves the purpose of the same state of the sand in the sand storage bin 1, so that the sand can be discharged evenly.

[0047] When the sand storage bin 1 is full of sand, there is no need to add sand to the upper sand hopper 2. At this time, the buffer plate 6 divides the inner cavity of the sand storage bin 1 into two parts, both of which are filled with sand. However, the sand in the upper and lower parts remains connected through the channel between the buffer plate 6 and the inner wall of the sand storage bin 1. The sand above the buffer plate 6 still squeezes the sand below by gravity at the interval. In order to further reduce the problem of uneven compaction of the sand caused by squeezing the sand below, the following embodiment 2 is provided for optimization based on the above scheme.

[0048] In the specific embodiment 2:

[0049] like Figure 6 As shown, the buffer plate 6 is a straight plate, and a slot 1111 is obliquely opened on one side wall of the front side wall 111, and the angle α between the bottom surface of the slot 1111 and the front side wall 111 is ≤ 45°. An overhanging plate 1112 is provided below the slot 1111, and the overhanging plate 1112 is provided parallel to the slot 1111.

[0050] like Figure 7 and Figure 8 As shown, a support plate assembly 4 is provided on one side of the sand storage bin 1. The support plate assembly 4 and the slot 1111 are located on the same side. The support plate assembly 4 includes a support rod 41, a cross rod 42 and a guide member 43. Figure 9 As shown, one end of the support rod 41 is rotatably connected to the side wall of the sand storage bin 1, and a hydraulic cylinder 411 is provided below the support rod 41. The hydraulic cylinder 411 and the sand storage bin 1 are rotatably connected, and the output shaft of the hydraulic cylinder 411 abuts against the lower end of the support rod 41. The cross bar 42 is fixed to the free end of the support rod 41. A positioning plate 412 is fixedly connected to the support rod 41. The positioning plate 412 is vertically arranged to the support rod 41. The hydraulic cylinder 411 can push the support rod 41 to rotate. When the end of the positioning plate 412 abuts and fits under the overhanging plate 1112, the support rod 41 and the slot 1111 are in a parallel state, as shown in FIG. Figure 10 and Figure 11 As shown, both ends of the crossbar 42 are provided with guide members 43, and the guide members 43 include a plate clamping sleeve 431 and a roller 432. A clamping groove 4311 is provided on one side of the plate clamping sleeve 431, and an inner groove 4312 is provided at the bottom of the clamping groove 4311. The clamping groove 4311 is connected to the inner groove 4312. The plate clamping sleeves 431 on both sides are symmetrically arranged, as shown in FIG. Figure 12 As shown, a plurality of rollers 432 are arranged along the length direction inside the inner groove 4312 , and the buffer plate 6 is inserted into the clamping groove 4311 , with both sides of the buffer plate 6 abutting against the rollers 432 .

[0051] like Figure 10 、 Figure 13 and Figure 14As shown, both sides of the support rod 41 are provided with a limit assembly 5, and the two sets of limit assemblies 5 are symmetrically arranged. The limit assembly 5 includes a guide sleeve 51, a slide column 52, an end block 53 and an upper block 54. The guide sleeve 51 is fixed on the cross bar 42. One end of the guide sleeve 51 is provided with an opening, and the opening is located on the side away from the support rod 41, as shown in FIG. Figure 10 As shown, a slide groove 511 is provided inside the guide sleeve 51, a slide hole 512 is provided on the closed end surface of the guide sleeve 51, and a slide post 52 is slidably connected to the inside of the slide hole 512. One end of the slide post 52 is an arc surface, as shown in FIG. Figure 15 As shown, the other end of the sliding column 52 is fixedly connected to the end block 53, the upper surface of the end block 53 is an inclined surface, and the end block 53 is slidably connected to the sliding groove 511. The upper surface of the guide sleeve 51 is open, and the lower surface of the upper top block 54 is an inclined surface. The lower surface of the upper top block 54 fits the upper surface of the end block 53, and the upper top block 54 slides normally along the buffer plate 6 inside the sliding groove 511. A side plate 5111 is vertically provided inside the sliding groove 511, and one side of the upper top block 54 abuts on the side plate 5111. A spring 521 is provided on the outer peripheral side of the sliding column 52, and a top plate 522 is fixed on the sliding column 52. One end of the spring 521 abuts on the top plate 522, and the other end of the spring 521 abuts on the guide sleeve 51. The upper end of the upper top block 54 is fixedly connected to the clamping piece 541.

[0052] like Figure 16 As shown, the upper surface of the buffer plate 6 is provided with two lower holes 61, and an upper hole 62 is provided on one side of the lower hole 61. The upper hole 62 and the lower hole 61 are arranged in a colinear manner, and the upper hole 62 is close to the side of the buffer plate 6. A slide rail 63 is fixedly connected to the center of the lower surface of the buffer plate 6. An inner support member 64 is slidably connected to the slide rail 63. Two threaded holes 631 are provided on the lower surface of the slide rail 63. The two threaded holes 631 are respectively on the same horizontal line as the upper hole 62 and the lower hole 61. The inner support member 64 is fixed in the threaded hole 631 by screws, and one end of the inner support member 64 is a pointed tip. Figure 15 As shown, when no sand is added to the sand storage bin 1, the position of the inner support member 64 on the slide rail 63 is adjusted, and the inner support member 64 is installed in the threaded hole 631 position on the same horizontal line as the lower hole 61. The buffer plate 6 is inserted from the guide sleeve 51. The inner support member 64 will push the two sets of slide columns 52 outward, and the upper push block 54 will move upward to push the clamping member 541 out of the lower hole 61. The clamping member 541 deforms and pops out to one side and is fixed on the outside of the buffer plate 6. The buffer plate 6 is limited and fixed, and a channel is left between the buffer plate 6 and the inner wall of the sand storage bin 1. Figure 16As shown, adjust the position of the inner support member 64 on the slide rail 63, and install the inner support member 64 at the threaded hole 631 position which is on the same horizontal line as the upper hole 62. After the installation of the buffer plate 6 is completed, one end of the buffer plate 6 extends downward, so that the opening of the channel becomes smaller. By adjusting the position of the inner support member 64 on the slide rail 63, the size of the opening of the channel can be adjusted to meet the needs of different viscous sand materials.

[0053] like Figure 17 As shown, a pushing member 7 is provided above the cross bar 42, and the pushing member 7 includes an upper beam 71 and a hydraulic cylinder 2 72. Both ends of the upper beam 71 are respectively fixed on the plate jacket 431, and the hydraulic cylinder 2 72 is provided on the upper beam 71. An upper plate 8 is provided above the buffer plate 6, and the upper plate 8 is slidably connected in the slot 1111. The upper plate 8 is fixed on the output shaft of the hydraulic cylinder 2 72, and the hydraulic cylinder 2 72 can push the upper plate 8 to slide above the buffer plate 6.

[0054] like Figure 18 and Figure 19 As shown, a channel is left between the buffer plate 6 and the inner wall of the sand storage bin 1, and the buffer plate 6 always maintains this state. The buffer plate 6 plays a supporting role under the upper plate 8. The upper plate 8 is used to withstand the impact of the falling sand. A travel switch is set on the lower surface of the buffer plate 6. The triggering condition of the travel switch is that the sand is accumulated to the same horizontal height as the point where the upper plate 8 and the side wall of the sand storage bin 1 meet. When the sand in the inner cavity of the sand storage bin 1 below the buffer plate 6 accumulates to the position of the travel switch, the travel switch will be triggered, and the travel switch will send information The data is transmitted to the controller, and the controller controls the hydraulic cylinder 2 72 to push the upper plate 8 down along the buffer plate 6 until it abuts against the opposite side wall of the sand storage bin 1. During the sand laying operation, the sand will flow out from the lower sand port below the sand storage bin 1. At this time, there is no need to worry about the sand under the buffer plate 6 being squeezed. The hydraulic cylinder 2 72 is controlled to pull the upper plate 8 up along the buffer plate 6 until the channel left between the buffer plate 6 and the inner wall of the sand storage bin 1 leaks out, so that the sand can flow out through the channel, ensuring that the sand is not interrupted during the sand laying process.

[0055] Preferably, the buffer plate 6 and the upper plate 8 can extend to cover the entire length direction of the sand storage bin 1, thereby increasing the supporting area.

[0056] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A multifunctional sand conveying device for a sand-type 3D printer sand paving device, comprising a sand storage bin (1), an upper sand hopper (2), a motor (3) and a spiral conveying shaft (31), wherein the sand storage bin (1) comprises an upper bin portion (11) and a lower bin portion (12), wherein the upper bin portion (11) is arranged at the upper end of the lower bin portion (12), the upper bin portion (11) comprises a front side wall (111), and a slot (1111) is obliquely penetrated on one side wall of the front side wall (111), the upper sand hopper (2) is arranged at the feed opening of the sand storage bin (1), the motor (3) is fixed to one end of the sand storage bin (1), and one end of the spiral conveying shaft (31) is fixedly connected to the output shaft of the motor (3), characterized in that: The sand storage bin (1) further comprises a buffer plate (6), the buffer plate (6) being arranged below the spiral conveying shaft (31), the buffer plate (6) being obliquely mounted on the inner side wall of the sand storage bin (1), a channel being arranged between the free end of the buffer plate (6) and the inner wall of the other side of the sand storage bin (1), the height of the free end of the buffer plate (6) being lower than the height of the fixed end, a support plate assembly (4) being arranged on one side of the sand storage bin (1), the support plate assembly (4) comprising a support rod (41), a cross rod (42) and a guide member (43), one end of the support rod (41) being rotatably connected to the side wall of the sand storage bin (1), the cross rod (42) being fixed to the free end of the support rod (41), and both ends of the cross rod (42) being provided with a guide member (43). The guide member (43) includes a plate clamping sleeve (431), a clamping groove (4311) is provided on one side of the plate clamping sleeve (431), and the buffer plate (6) is inserted into the clamping groove (4311). Both sides of the support rod (41) are provided with a limit assembly (5), and the two groups of the limit assemblies (5) are symmetrically arranged. The limit assembly (5) includes a guide sleeve (51), a sliding column (52), an end block (53) and an upper top block (54). The guide sleeve (51) is fixed on the cross bar (42), and one end of the guide sleeve (51) is provided with an opening, and the opening is located on the side away from the support rod (41). The guide sleeve (51) is provided with a sliding groove (511) inside. The guide sleeve (51) A sliding hole (512) is provided on the closed end surface, and the sliding column (52) is slidably connected to the inside of the sliding hole (512). One end of the sliding column (52) is an arc surface, and the other end of the sliding column (52) is fixedly connected to the end block (53). The upper surface of the end block (53) is an inclined surface. The end block (53) and the sliding groove (511) are slidably connected. The upper surface of the guide sleeve (51) is open, and the lower surface of the upper block (54) is an inclined surface. The lower surface of the upper block (54) and the upper surface of the end block (53) are fitted together. The upper block (54) slides normally along the buffer plate (6) inside the sliding groove (511). A side plate (5111) is vertically provided inside the sliding groove (511). One side of the upper top block (54) abuts against the side plate (5111), the outer peripheral side of the slide column (52) is provided with a spring (521), a top plate (522) is fixed on the slide column (52), one end of the spring (521) abuts against the top plate (522), and the other end of the spring (521) abuts against the guide sleeve (51), the upper end of the upper top block (54) is fixedly connected with a clamping member (541), the upper surface of the buffer plate (6) is provided with two lower holes (61), one side of the lower hole (61) is provided with an upper hole (62), the center position of the lower surface of the buffer plate (6) is fixedly connected with a slide rail (63), and the slide rail (63) is slidably connected with an inner support member (64),Two threaded holes (631) are provided on the lower surface of the slide rail (63), and the two threaded holes (631) are respectively on the same horizontal line as the upper hole (62) and the lower hole (61). An upper plate (8) is provided above the buffer plate (6), and the upper plate (8) is slidably connected to the slot (1111). A pusher (7) is provided above the crossbar (42), and the pusher (7) includes an upper beam (71) and a second hydraulic cylinder (72). A controller controls the second hydraulic cylinder (72) to push the upper plate (8) downward along the buffer plate (6) until it abuts against the opposite side wall of the sand storage bin (1). During the sand laying operation, the second hydraulic cylinder (72) is controlled to pull the upper plate (8) upward along the buffer plate (6) until the channel left between the buffer plate (6) and the inner wall of the sand storage bin (1) is leaked, and the projection of the screw conveying shaft (31) and the channel in the horizontal direction does not overlap.

2. The multifunctional sand conveying device for a sand mold 3D printer sand paving device according to claim 1, characterized in that: The upper bin portion (11) further includes a rear side wall (112) and a connecting wall (113), the front side wall (111) and the rear side wall (112) are vertical and parallel to each other, the front side wall (111) and the rear side wall (112) are surrounded by two connecting walls (113) to form a fully enclosed frame, the two connecting walls (113) are arranged in parallel, the connecting wall (113) and the front side wall (111) are perpendicular to each other, the bottom opening of the lower bin portion (12) is bent inward, and the bottom opening of the lower bin portion (12) and the lowest point of the free end of the buffer plate (6) are horizontally aligned. The upward projections do not overlap, the bottom opening of the lower bin portion (12) is close to the front side wall (111), the upper end opening size of the upper sand hopper (2) is larger than the lower end opening size, the side wall of the upper sand hopper (2) and the front side wall (111) on the same side is an inclined surface and the angle between it and the front side wall (111) is an obtuse angle, the side wall opposite to the inclined side wall of the upper sand hopper (2) and the rear side wall (112) are located in the same plane, and the angle between the buffer plate (6) and the front side wall (111) is smaller than the angle between the inclined side wall of the upper sand hopper (2) and the front side wall (111).

3. The multifunctional sand conveying device of the sand paving device of the sand mold 3D printer according to claim 2 is characterized in that: The length extension direction of the spiral conveying shaft (31) is perpendicular to the connecting wall (113). The spiral conveying shaft (31) is located in the plane where the connecting wall (113) is located and close to the front side wall (111). A plurality of sand material stirring blades (311) are fixed on the main shaft of the spiral conveying shaft (31). The plurality of sand material stirring blades (311) are evenly arranged along the spiral direction of the spiral blades of the spiral conveying shaft (31).

4. The multifunctional sand conveying device for a sand mold 3D printer sand paving device according to claim 2, characterized in that: A hopper cover (13) is rotatably connected above the sand storage bin (1), the hopper cover (13) is located on one side of the upper sand hopper (2), and a sensor bracket (9) is provided below the hopper cover (13), the sensor bracket (9) comprising an upper support plate (91) and a lower support plate (92), the lower support plate (92) being fixed to the rear side wall (112), the upper support plate (91) being fixed to the upper end of the lower support plate (92), an arc-shaped U-shaped hole being provided on the side surface of the lower support plate (92), and two straight U-shaped holes being provided on the end surface of the upper support plate (91).

5. The multifunctional sand conveying device for sand paving of a sand mold 3D printer according to claim 2, characterized in that: A bending plate is fixed to one end of the buffer plate (6), and the bending plate is fixed parallel to the front side wall (111), and an angle of ≥135° is set between the buffer plate (6) and the bending plate.

6. The multifunctional sand conveying device for a sand mold 3D printer sand paving device according to claim 4, characterized in that: An outrigger plate (1112) is provided below the slot (1111), the outrigger plate (1112) is arranged parallel to the slot (1111), the support plate assembly (4) and the slot (1111) are located on the same side, a hydraulic cylinder (411) is provided below the support rod (41), the hydraulic cylinder (411) and the sand storage bin (1) are rotatably connected, the output shaft of the hydraulic cylinder (411) abuts against the lower end of the support rod (41), a positioning plate (412) is fixedly connected to the support rod (41), and the positioning plate (412) is arranged perpendicular to the support rod (41).

7. The multifunctional sand conveying device for a sand mold 3D printer sand paving device according to claim 6, characterized in that: The guide member (43) further includes a roller (432), an inner groove (4312) is provided at the bottom of the clamping groove (4311), the clamping groove (4311) is communicated with the inner groove (4312), the plate clamping sleeves (431) on both sides are symmetrically arranged, a plurality of rollers (432) are arranged inside the inner groove (4312) along the length direction, and both sides of the buffer plate (6) abut against the rollers (432).

8. The multifunctional sand conveying device for a sand mold 3D printer according to claim 7, characterized in that: The upper hole (62) and the lower hole (61) are arranged colinearly, the upper hole (62) is close to the side edge of the buffer plate (6), and the inner support member (64) is fixed in the threaded hole (631) by means of screws.

9. The multifunctional sand conveying device for a sand paving device of a sand mold 3D printer according to claim 8, characterized in that: The two ends of the upper beam (71) are respectively fixed on the plate jacket (431), the second hydraulic cylinder (72) is arranged on the upper beam (71), and the upper plate (8) is fixed on the output shaft of the second hydraulic cylinder (72). The second hydraulic cylinder (72) can push the upper plate (8) to slide above the buffer plate (6).

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