Multifunctional sand conveying device for sand paver of sand mold 3D printer

Abstract

The invention provides a multifunctional sand conveying device for a sand paver of a sand mold 3D printer, and relates to the technical field of sand mold 3D printing, and the multifunctional sand conveying device comprises a sand storage bin, a sand feeding hopper, a motor, a spiral conveying shaft and a buffer plate. According to the multifunctional sand conveying device for the sand paver of the sand mold 3D printer, when sand enters the sand storage bin from the sand feeding hopper, sand at a sand discharging opening in the bottom of the sand storage bin can be compacted, the compactness of the sand below the sand feeding hopper is larger than that of other sand in the sand storage bin, and the sand discharging uniformity is affected; a gap is reserved between the free end of the buffer plate and the inner wall of the other side of the sand storage bin, sand can fall to the bottom, and when entering the sand storage bin from the sand feeding hopper, the sand is buffered through the buffer plate and then slides to the sand discharging opening through the inner side wall of the sand storage bin, so that the phenomenon that the compactness of the sand below the sand feeding hopper is larger than that of other sand in the sand storage bin is avoided, and the sand storage efficiency is improved. The purpose that the sand in the sand storage bin is the same in state is achieved, and therefore sand discharging can be even.

Description

Technical Field

[0001] The present invention relates to the technical field of sand mold 3D printing, and particularly to a multi-functional sand feeding device for a sand spreading device of a sand mold 3D printer. Background Art

[0002] The sand feeding device of the sand spreading device of a sand mold 3D printer is a key component in the sand mold 3D printer for transporting sand materials from the sand storage bin to the printing area. Its function is to ensure that the sand materials can be evenly laid on the printing platform to form each layer of the sand mold, and to achieve precise stacking of the sand mold according to the design requirements. It is also necessary to ensure that the fluidity of the sand materials is consistent and the compactness is uniform during the sand spreading process. In a sand mold 3D printer, after the sand materials enter the sand storage bin through the upper sand hopper, the sand storage bin transports the sand materials to the sand spreading device for sand spreading. The sand storage bin usually uses gravity to make the sand materials flow to the lower sand outlet.

[0003] In the existing sand feeding device, when the sand materials enter the sand storage bin from the upper sand hopper, the sand materials at the bottom of the sand storage bin will be impacted by the gravity of the upper sand materials. And as the sand materials continue to accumulate, the sand layer near the lower sand outlet bears a large pressure, the voids between the sand grains are compressed, and the compactness is significantly higher than other areas of the sand storage bin. The uneven compactness will cause the fluidity of the sand materials to be inconsistent when they are transported to the sand spreading device, thereby affecting the uniformity of sand spreading. Summary of the Invention

[0004] The present invention provides a multi-functional sand feeding device for a sand spreading device of a sand mold 3D printer, which solves the problem that the uneven compactness causes the fluidity of the sand materials to be inconsistent when they are transported to the sand spreading device, thereby affecting the uniformity of sand spreading as mentioned in the above background art.

[0005] To achieve the above object, the present invention provides the following technical solution: A multi-functional sand feeding device for a sand spreading device of a sand mold 3D printer, comprising a sand storage bin, an upper sand hopper, a motor and a spiral conveyor shaft. The upper sand hopper is arranged at the feeding opening of the sand storage bin, the motor is fixed at one end of the sand storage bin, and one end of the spiral conveyor shaft is fixedly connected to the output shaft of the motor. It is characterized in that it further comprises a buffer plate, the buffer plate is arranged below the spiral conveyor shaft, the buffer plate is inclined and installed on the inner side wall of the sand storage bin, a channel is arranged between the free end of the buffer plate and the inner wall of 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 part and a lower bin part. The upper bin part is arranged at the upper end of the lower bin part. The upper bin part includes a front side wall, a rear side wall and connecting walls. 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 enclosed by two connecting walls to form a fully enclosed frame. The two connecting walls are arranged in parallel between them. The connecting wall is perpendicular to the front side wall. The bottom opening of the lower bin part is bent inward. The projection position of the bottom opening of the lower bin part and the lowest point of the free end of the buffer plate in the horizontal direction do not coincide. The bottom opening of the lower bin part is close to the front side wall. The upper opening size of the upper sand hopper is larger than the lower 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 included 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. The included angle between the buffer plate and the front side wall is smaller than the included angle between the inclined side wall of the upper sand hopper and the front side wall.

[0007] Preferably, the length extension direction of the screw conveyor shaft is perpendicular to the connecting wall. The screw conveyor shaft is located in the plane where the connecting wall is located and close to the front side wall. A plurality of sand-turning blades are fixed on the main shaft of the screw conveyor shaft. The plurality of sand-turning blades are evenly arranged along the spiral direction of the spiral blades of the screw conveyor 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. An inductor support is arranged below the bin cover. The inductor support includes an upper support plate and a lower support plate. The lower support plate is fixed on the connecting wall. The upper support plate is fixed at the upper end of the lower support plate. An arc-shaped U-shaped hole is opened on the side surface of the lower support plate. Two straight U-shaped holes are opened on the end surface of the upper support plate.

[0009] Preferably, a bending plate is fixed at one end of the buffer plate. The bending plate is fixedly attached to the front side wall in parallel. The included angle between the buffer plate and the bending plate is ≥135°.

[0010] Preferably, a slot is obliquely penetrated and opened on one side wall of the front side wall. An extension plate is arranged below the slot. The extension plate is arranged in parallel with the slot. A support plate assembly is arranged on one side of the sand storage bin. The support plate assembly and the slot are 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 I is arranged below the support rod. The hydraulic cylinder I is rotatably connected to the sand storage bin. The output shaft of the hydraulic cylinder I abuts against the lower end of the support rod. The cross bar is fixed at the free end of the support rod. A positioning plate is fixedly connected to the support rod. The positioning plate is perpendicular to the support rod.

[0011] Preferably, guide members are provided at both ends of the cross bar. The guide members include plate clip sleeves and rollers. A clip groove is formed on one side of the plate clip sleeve. An inner groove is provided at the bottom of the clip groove. The clip groove communicates with the inner groove. The two plate clip sleeves on both sides are symmetrically arranged. A plurality of rollers are arranged along the length direction inside the inner groove. The buffer plate is inserted into the clip groove, and both sides of the buffer plate are abutted against the rollers.

[0012] Preferably, limiting components are provided on both sides of the support rod. The two groups of limiting components are symmetrically arranged. The limiting component includes a guide sleeve, a sliding column, an end block and an upper top block. The guide sleeve is fixed on the cross bar. An opening is provided at one end of the guide sleeve, and the opening is located on the side far from the support rod. A sliding groove is formed inside the guide sleeve. A sliding hole is formed on the closed end surface of the guide sleeve. The sliding column is slidably connected inside the sliding hole. One end of the sliding column is an arc surface. The other end of the sliding column is fixedly connected with the end block. The upper surface of the end block is an inclined surface. The end block is slidably connected with the sliding groove. The upper surface of the guide sleeve is in an open shape. The lower surface of the upper top block is an inclined surface. The lower surface of the upper top block and the upper surface of the end block are fitted. The upper top block slides along the normal direction of the buffer plate inside the sliding groove. A side plate is vertically arranged inside the sliding groove. One side of the upper top block abuts against the side plate. A spring is sleeved on the outer peripheral side of the sliding column. A top plate is fixed on the sliding column. One end of the spring abuts against the top plate, and the other end of the spring abuts against the guide sleeve. The upper end of the upper top block is fixedly connected with a clamping member.

[0013] Preferably, two lower holes are formed 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 collinear. The upper hole is close to the side position of the buffer plate. A slide rail is fixedly connected at the center position of the lower surface of the buffer plate. An inner support member is slidably connected on the slide rail. Two threaded holes are formed on the lower surface of the slide rail. The two threaded holes are respectively on the same horizontal line as the upper hole and the lower hole. The inner support member is fixed in the threaded hole by screws.

[0014] Preferably, a pushing member is provided above the cross bar. 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 clip sleeves. The second hydraulic cylinder is arranged 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.

[0015] Compared with the prior art, the beneficial effects of the present invention are: When the abrasive material enters the sand storage bin from the upper abrasive hopper, due to gravity, every time the abrasive material enters the sand storage bin from the upper abrasive hopper, it will compact the sand at the lower sand outlet at the bottom of the sand storage bin, resulting in a greater compactness of the sand below the upper abrasive hopper than that at the other positions in the sand storage bin, which affects the uniformity of the sand feeding. By installing a buffer plate below the upper abrasive hopper, the buffer plate is fixed on the inner side wall of the sand storage bin, and there is a channel between the free end of the buffer plate and the inner wall on the other side of the sand storage bin, which allows the abrasive material to fall to the bottom. When the abrasive material enters the sand storage bin from the upper abrasive hopper, it is first buffered by the buffer plate and then slides down to the lower sand outlet through the inner side wall of the sand storage bin, avoiding the phenomenon that the compactness of the sand below the upper abrasive hopper is greater than that at the other positions in the sand storage bin, achieving the purpose of the same state of the sand in the sand storage bin, so as to make the sand feeding uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic structural diagram of the multi-functional sand feeding device of the sand mold 3D printer of the present invention; Figure 2 Schematic structural diagram of the installation position of the buffer plate in the first embodiment of the present invention; Figure 3 Schematic structural diagram of the spiral stirring shaft of the present invention; Figure 4 Schematic structural diagram of the installation position of the sensor bracket of the present invention; Figure 5 is Figure 4 Enlarged view of part A; Figure 6 Schematic structural diagram of the position where the slot is opened according to the present invention; Figure 7 Schematic structural diagram of the second embodiment of the present invention; Figure 8 Schematic structural diagram of the installation position of the support plate assembly of the present invention; Figure 9 Side view of the second embodiment of the present invention; Figure 10 Schematic structural diagram of the installation position of the guide sleeve of the present invention; Figure 11 Schematic structural diagram of the cooperation between the slide rail and the inner support member of the present invention; Figure 12 is Figure 11 Enlarged view of part B; Figure 13 Schematic diagram of the cooperation between the inner support member and the limit assembly in the second embodiment of the present invention; Figure 14 is Figure 13 Enlarged view of part C; Figure 15 Schematic diagram of the buffer plate fixed by the limit assembly according to the present invention; Figure 16 Schematic diagram of the buffer plate structure of the present invention; Figure 17 Schematic diagram of the pusher in the second embodiment of the present invention; Figure 18 Schematic diagram of the upper plate in a fully sealed state in the second embodiment of the present invention; Figure 19 Schematic diagram of the upper plate in an open state in the second embodiment of the present invention.

[0017] Reference numerals in the figure: 1, sand storage bin; 11, upper bin part; 12, lower bin part; 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, first hydraulic cylinder; 412, positioning plate; 42, cross bar; 43, guide member; 431, plate clamping sleeve; 4311, clamping groove; 4312, inner groove; 432, roller; 5, limit assembly; 51, guide sleeve; 511, sliding groove; 5111, side plate; 512, sliding hole; 52, sliding column; 521, spring; 522, top plate; 53, end block; 54, upper top block; 541, clamping member; 6, buffer plate; 61, lower hole; 62, upper hole; 63, slide rail; 631, threaded hole; 64, inner support member; 7, pusher; 71, upper beam; 72, second hydraulic cylinder; 8, upper plate; 9, sensor bracket; 91, upper support plate; 92, lower support plate. Detailed implementation manners

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The present invention takes the direction of the device working and moving as the positive front. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

[0019] The present invention provides a multi-functional sand conveying device for a sand mold 3D printer spreader.

[0020] Specific embodiment one: Such as Figure 1 And Figure 2As shown, it includes a sand storage bin 1, an upper sand hopper 2, a motor 3, a screw conveyor shaft 31, and a buffer plate 6. The upper sand hopper 2 is arranged at the feeding opening of the sand storage bin 1. The motor 3 is fixed at one end of the sand storage bin 1. A bearing sleeve 32 is arranged at one end of the sand storage bin 1. One end of the screw conveyor 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 conveying sand by the screw conveyor shaft 31. The buffer plate 6 is arranged below the screw conveyor shaft 31. The buffer plate 6 is inclined and installed on the inner side wall of the sand storage bin 1. A channel is arranged between the free end of the buffer plate 6 and the inner wall on the other side of the sand storage bin 1. The height of the free end of the buffer plate 6 is lower than that of the fixed end.

[0021] As Figure 2 shown, the sand storage bin 1 includes an upper bin part 11 and a lower bin part 12. The upper bin part 11 is arranged at the upper end of the lower bin part 12. The upper bin part 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 between them. The connecting wall 113 is perpendicular to the front side wall 111. The bottom opening of the lower bin part 12 is bent inward. The projection position of the bottom opening of the lower bin part 12 and the lowest point of the free end of the buffer plate 6 in the horizontal direction do not coincide. The bottom opening of the lower bin part 12 is close to the front side wall 111. The upper opening size of the upper sand hopper 2 is larger than the lower 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 included angle with the front side wall 111 is an obtuse angle. The opposite side wall of the inclined side wall of the upper sand hopper 2 is in the same plane as the rear side wall 112. The included angle between the buffer plate 6 and the front side wall 111 is smaller than the included angle between the inclined side wall of the upper sand hopper 2 and the front side wall 111. One end of the buffer plate 6 is fixed with a bent plate, and the bent plate is fixedly attached to the front side wall 111 in parallel. An included angle of ≥135° is arranged between the buffer plate 6 and the bent plate.

[0022] The length extension direction of the screw conveyor shaft 31 is perpendicular to the connecting wall 113. The screw conveyor 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 screw conveyor shaft 31 helps to improve the flow of materials, especially when the conveyed materials are dense or have high viscosity, to avoid the accumulation or blockage of materials during the conveying process. Preferably, as Figure 3 shown, a plurality of sand-turning blades 311 are fixed on the main shaft of the screw conveyor shaft 31. The plurality of sand-turning blades 311 are uniformly arranged along the spiral direction of the spiral blades of the screw conveyor shaft 31. During the process of conveying sand in the sand storage bin 1, the sand can be repeatedly turned over, effectively avoiding the caking of sand.

[0023] As Figure 4 and Figure 5As shown in the figure, a cover 13 is rotatably connected above the sand storage bin 1. The cover 13 is located on one side of the upper sand hopper 2. Below the cover 13, there is a sensor bracket 9. 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. The upper support plate 91 is fixed to the upper end of the lower support plate 92. An arc-shaped U-shaped hole is formed on the side surface of the lower support plate 92, and two straight U-shaped holes are formed on the end surface of the upper support plate 91. The straight U-shaped holes are used to fix the sensor. The cover 13 is provided with through holes at the corresponding positions of the sensor bracket 9 to leave an installation space for the sensor. The sensor can slide vertically along the straight U-shaped holes to adjust the sensing height of the sensor, and sense the remaining amount of sand in the sand storage bin 1. When the sand in the sand storage bin 1 is filled up, the sensor will be triggered and give a prompt. The arc-shaped U-shaped hole is the connection hole between the sensor bracket 9 and the sand storage bin 1. The connection position between the lower support plate 92 of the sensor bracket 9 and the sand storage bin 1 is fixed and all 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 of the arc of the arc-shaped U-shaped hole. When loosening the screws at the upper and lower connections, rotating the sensor bracket 9 can adjust the position of the upper connection screw in the arc-shaped U-shaped hole, and can adjust the inclination angle of the sensor bracket 9. Then, tighten the screws at the upper and lower connections to fasten the lower support plate 92 to the connecting wall 113, realizing the function of adjusting the height of the sensor and ensuring that the sensor can accurately sense the remaining amount of sand.

[0024] The sensor can be selected from distance sensors such as travel switches.

[0025] The sand enters from the upper opening of the upper sand hopper 2 and slides down along the inclined side wall of the upper sand hopper 2 into the interior of the sand storage bin 1. After being buffered by the buffer plate 6, it 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 opposite lower bin part 12, and then falls to the bottom of the sand storage bin 1 at the position directly below the upper sand hopper 2. When the sand accumulates to the height of the screw conveyor shaft 31, start the motor 3 to drive the screw conveyor shaft 31 to rotate, and push the sand in contact with the screw conveyor shaft 31 forward. The forward-moved 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 that of the remaining sand in the sand storage bin 1, achieving the purpose of the same state of the sand in the sand storage bin 1, so that the sand feeding can be uniform.

[0026] When the sand storage bin 1 is filled with sand materials, it is no longer necessary to add sand materials to the upper sand hopper 2. At this time, both the upper and lower parts of the inner cavity of the sand storage bin 1 separated by the buffer plate 6 are filled with sand materials. However, the sand materials in the upper and lower parts are kept connected through the channels between the buffer plate 6 and the inner wall of the sand storage bin 1. The sand materials above the buffer plate 6 still exert a gravitational extrusion on the sand materials below at the interval. In order to further reduce the problem of uneven compaction degree of the sand materials caused by the extrusion of the lower sand materials, on the basis of the above solution, the following second embodiment is provided for optimization.

[0027] In the specific second embodiment: As Figure 6 shown, the buffer plate 6 is a straight plate, and a slot 1111 is obliquely penetrated and opened on one side wall of the front side wall 111. The included angle α between the bottom surface of the slot 1111 and the front side wall 111 is ≤ 45°. An extension plate 1112 is arranged below the slot 1111, and the extension plate 1112 is arranged in parallel with the slot 1111.

[0028] As Figure 7 and Figure 8 shown, a support plate assembly 4 is arranged on one side of the sand storage bin 1. The support plate assembly 4 and the slot 1111 are on the same side. The support plate assembly 4 includes a support rod 41, a cross bar 42 and a guide member 43. As Figure 9 shown, one end of the support rod 41 is rotatably connected to the side wall of the sand storage bin 1. A hydraulic cylinder 411 is arranged below the support rod 41. The hydraulic cylinder 411 is rotatably connected to the sand storage bin 1. 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 perpendicular 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 against and fits below the extension plate 1112, the support rod 41 is in a parallel state with the slot 1111. As Figure 10 and Figure 11 shown, guide members 43 are arranged at both ends of the cross bar 42. The guide member 43 includes a plate clamping sleeve 431 and a roller 432. A clamping groove 4311 is opened on one side of the plate clamping sleeve 431. An inner groove 4312 is arranged at the bottom of the clamping groove 4311. The clamping groove 4311 is communicated with the inner groove 4312. The two side plate clamping sleeves 431 are symmetrically arranged. As Figure 12 shown, a plurality of rollers 432 are arranged along the length direction inside the inner groove 4312. The buffer plate 6 is inserted into the clamping groove 4311, and both sides of the buffer plate 6 abut against the rollers 432.

[0029] As Figure 10 、 Figure 13 and Figure 14As shown, limiting components 5 are arranged on both sides of the support rod 41. The two groups of limiting components 5 are symmetrically arranged. The limiting component 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. One end of the guide sleeve 51 is provided with an opening, and the opening is located on the side far from the support rod 41. As Figure 10 shown, a sliding groove 511 is formed inside the guide sleeve 51, and a sliding hole 512 is formed on the closed end face of the guide sleeve 51. The sliding column 52 is slidably connected inside the sliding hole 512. One end of the sliding column 52 is an arc surface. As Figure 15 shown, the other end of the sliding column 52 is fixedly connected with an end block 53. The upper surface of the end block 53 is an inclined surface. The end block 53 is slidably connected with the sliding groove 511. The upper surface of the guide sleeve 51 is open. The lower surface of the upper top block 54 is an inclined surface. The lower surface of the upper top block 54 is in contact with the upper surface of the end block 53. The upper top block 54 slides along the normal direction of the buffer plate 6 inside the sliding groove 511. A side plate 5111 is vertically arranged inside the sliding groove 511. One side of the upper top block 54 abuts against the side plate 5111. A spring 521 is sleeved on the outer peripheral side of the sliding column 52. A top plate 522 is fixed on the sliding 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.

[0030] As Figure 16 shown, two lower holes 61 are formed through the upper surface of the buffer plate 6. One side of the lower hole 61 is provided with an upper hole 62. The upper hole 62 and the lower hole 61 are collinearly arranged. The upper hole 62 is close to the side of the buffer plate 6. A slide rail 63 is fixedly connected to the center position 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 formed 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 a screw. One end of the inner support member 64 is a pointed end. As Figure 15 shown, when no sand material is added to the sand storage bin 1, adjust the position of the inner support member 64 on the slide rail 63, install the inner support member 64 at the position of the threaded hole 631 on the same horizontal line as the lower hole 61, insert the buffer plate 6 into the guide sleeve 51, the inner support member 64 will push the two sliding columns 52 outwards, the upper top block 54 will move upwards to push the clamping member 541 out of the lower hole 61, and the clamping member 541 will deform and pop 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. As 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 position of the threaded hole 631 that is on the same horizontal line as the upper hole 62. After installing the buffer plate 6, at this time, one end of the buffer plate 6 extends downward, making the opening of the channel smaller. By adjusting the position of the inner support member 64 on the slide rail 63, the opening size of the channel can be adjusted to meet the requirements of different viscous sand materials.

[0031] As Figure 17 shown, a pusher 7 is provided above the cross bar 42. The pusher 7 includes an upper beam 71 and a second hydraulic cylinder 72. The two ends of the upper beam 71 are respectively fixed on the plate clamp sleeve 431, and the second hydraulic cylinder 72 is arranged on the upper beam 71. An upper plate 8 is provided above the buffer plate 6. The upper plate 8 is slidably connected in the slot 1111, 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.

[0032] As Figure 18 and Figure 19 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 below the upper plate 8, and the upper plate 8 is used to bear the impact of the falling sand material. A travel switch is arranged on the lower surface of the buffer plate 6. The trigger condition of the travel switch is that the sand material accumulates to the same horizontal height as the fitting point of the upper plate 8 and the side wall of the sand storage bin 1. When the sand material 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. The travel switch transmits the information to the controller, and the controller controls the second hydraulic cylinder 72 to push the upper plate 8 to move downward along the buffer plate 6 until it abuts against the opposite side wall of the sand storage bin 1. During the sand spreading operation, the sand material will flow out from the lower sand outlet below the sand storage bin 1. At this time, there is no need to consider the problem that the sand material below the buffer plate 6 will be squeezed. Control the second hydraulic cylinder 72 to pull the upper plate 8 to move 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 exposed, so that the sand material can flow out through the channel, ensuring that the sand supply is uninterrupted during the sand spreading process.

[0033] Preferably, the buffer plate 6 and the upper plate 8 can extend to cover the entire length direction of the sand storage bin 1, which can increase the supporting area.

[0034] Although the embodiments of the present invention have been disclosed as above, it is not limited to only the applications listed in the specification and embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily achieved. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the illustrated and described examples here.

Claims

1. A multi-functional sand feeding device for a sand mold 3D printer's sand spreading device, comprising a sand storage bin (1), an upper sand hopper (2), a motor (3) and a screw conveyor shaft (31). The upper sand hopper (2) is arranged at the feeding opening of the sand storage bin (1), the motor (3) is fixed at one end of the sand storage bin (1), and one end of the screw conveyor shaft (31) is fixedly connected to the output shaft of the motor (3). It is characterized in that, It further includes a buffer plate (6), the buffer plate (6) is arranged below the screw conveyor shaft (31), the buffer plate (6) is inclined and installed on the inner side 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), and the height of the free end of the buffer plate (6) is lower than the height of the fixed end.

2. The multi-functional sand feeding device for a sand mold 3D printer's sand spreading device according to claim 1, characterized in that, The sand storage bin (1) includes an upper bin part (11) and a lower bin part (12), the upper bin part (11) is arranged at the upper end of the lower bin part (12), the upper bin part (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) enclose a fully enclosed frame through the two connecting walls (113), the two connecting walls (113) are arranged in parallel between them, the connecting wall (113) is perpendicular to the front side wall (111), the bottom opening of the lower bin part (12) is bent inward, the projection position of the bottom opening of the lower bin part (12) in the horizontal direction does not coincide with the lowest point of the free end of the buffer plate (6), the bottom opening of the lower bin part (12) is close to the front side wall (111), the upper opening size of the upper sand hopper (2) is larger than the lower 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 included angle with the front side wall (111) is an obtuse angle, the opposite side wall of the inclined side wall of the upper sand hopper (2) is in the same plane as the rear side wall (112), and the included angle between the buffer plate (6) and the front side wall (111) is smaller than the included angle between the inclined side wall of the upper sand hopper (2) and the front side wall (111).

3. The multi-functional sand feeding device for a sand mold 3D printer's sand spreading device according to claim 2, characterized in that, The length extension direction of the screw conveyor shaft (31) is perpendicular to the connecting wall (113), the screw conveyor shaft (31) is located in the plane where the connecting wall (113) is located and close to the front side wall (111), and a plurality of sand-turning blades (311) are fixed on the main shaft of the screw conveyor shaft (31), and the plurality of sand-turning blades (311) are evenly arranged along the spiral direction of the spiral blades of the screw conveyor shaft (31).

4. The multi-functional sand feeding device for a sand mold 3D printer's sand spreading device according to claim 2, characterized in that, A bin cover (13) is rotatably connected above the sand storage bin (1), the bin cover (13) is located on one side of the upper sand hopper (2), an inductor bracket (9) is arranged below the bin cover (13), the inductor bracket (9) includes an upper support plate (91) and a lower support plate (92), the lower support plate (92) is fixed on the connecting wall (113), the upper support plate (91) is fixed at the upper end of the lower support plate (92), an arc-shaped U-shaped hole is opened on the side surface of the lower support plate (92), and two straight U-shaped holes are opened on the end surface of the upper support plate (91).

5. The multi-functional sand feeding device for a sand mold 3D printer's sand spreading device according to claim 2, characterized in that, One end of the buffer plate (6) is fixed with a bent plate, and the bent plate is fixedly attached to the front side wall (111) in parallel, and the included angle between the buffer plate (6) and the bent plate is ≥135°.

6. The multi-functional sand feeding device for a sand mold 3D printer's sand spreading device according to claim 4, characterized in that, On one side wall of the front side wall (111), a slot (1111) is obliquely and penetratingly formed. Below the slot (1111), an extension plate (1112) is provided. The extension plate (1112) is arranged parallel to the slot (1111). On one side of the sand storage bin (1), a support plate assembly (4) is provided. 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 bar (42) and a guide member (43). One end of the support rod (41) is rotatably connected to the side wall of the sand storage bin (1). Below the support rod (41), a first hydraulic cylinder (411) is provided. The first hydraulic cylinder (411) is rotatably connected to the sand storage bin (1). The output shaft of the first 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 arranged perpendicular to the support rod (41).

7. The multi-functional sand feeding device for a sand mold 3D printer's sand spreading device according to claim 6, characterized in that, Guide members (43) are provided at both ends of the cross bar (42). The guide member (43) includes a plate clamping sleeve (431) and a roller (432). On one side of the plate clamping sleeve (431), a clamping groove (4311) is formed. At the bottom of the clamping groove (4311), an inner groove (4312) is provided. The clamping groove (4311) communicates with the inner groove (4312). The two side plate clamping sleeves (431) are symmetrically arranged. A plurality of rollers (432) are arranged along the length direction inside the inner groove (4312). The buffer plate (6) is inserted into the clamping groove (4311). Both sides of the buffer plate (6) abut against the rollers (432).

8. The multi-functional sand feeding device for a sand mold 3D printer's sand spreading device according to claim 7, characterized in that, On both sides of the support rod (41), a limiting component (5) is provided. The two groups of the limiting components (5) are symmetrically arranged. The limiting component (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). 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). A sliding groove (511) is formed inside the guide sleeve (51). A sliding hole (512) is formed on the closed end surface of the guide sleeve (51). The sliding column (52) is slidably connected inside the sliding hole (512). One end of the sliding column (52) is an arc surface. The other end of the sliding column (52) is fixedly connected with the end block (53). The upper surface of the end block (53) is an inclined surface. The end block (53) is slidably connected with the sliding groove (511). The upper surface of the guide sleeve (51) is in an open shape. The lower surface of the upper top block (54) is an inclined surface. The lower surface of the upper top block (54) is in contact with the upper surface of the end block (53). The upper top block (54) slides in the normal direction of the buffer plate (6) inside the sliding groove (511). A side plate (5111) is vertically arranged inside the sliding groove (511). One side of the upper top block (54) abuts against the side plate (5111). A spring (521) is sleeved on the outer peripheral side of the sliding column (52). A top plate (522) is fixed on the sliding 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).

9. The multi-functional sand feeding device for a sand mold 3D printer's sand spreading device according to claim 8, characterized in that, Two lower holes (61) are formed through the upper surface of the buffer plate (6). One side of the lower hole (61) is provided with an upper hole (62). The upper hole (62) and the lower hole (61) are arranged collinearly. The upper hole (62) is close to the side position of the buffer plate (6). A slide rail (63) is fixedly connected to the central position 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 formed 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.

10. The multi-functional sand feeding device for a sand mold 3D printer's sand spreading device according to claim 9, characterized in that, A pusher (7) is arranged above the cross bar (42). The pusher (7) includes an upper beam (71) and a second hydraulic cylinder (72). Two ends of the upper beam (71) are respectively fixed on the plate clamp sleeve (431). The second hydraulic cylinder (72) is arranged on the upper beam (71). An upper plate (8) is arranged above the buffer plate (6). The upper plate (8) is slidably connected in the slot (1111). The upper plate (8) is fixed on the output shaft of the second hydraulic cylinder (72). The second hydraulic cylinder (72) pushes the upper plate (8) to slide above the buffer plate (6).

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