A sand spreading device

Abstract

The present invention discloses a sand spreading device, wherein a double-layer sand discharge port is provided below the sand storage bin, which are an upper staggered sand discharge port and a lower sand plate discharge port; the upper staggered sand discharge port comprises a left sand plate and a right sand plate arranged crosswise with each other, the two forming a horizontal staggered port at the bottom, and the vertical spacing of the staggered port is adjustable, utilizing the characteristics of the sand self-flow angle to achieve sand discharge during vibration and no sand discharge during non-vibration; the lower sand plate discharge port comprises left and right sand plates, and a vertical sand discharge port is provided between the sand plates on both sides, the width of the vertical sand discharge port is adjustable, further facilitating the control of the amount of sand discharged. When the sand spreading device is working, the sand flows out from the staggered port and enters the lower sand plate discharge port of the lower sand plate, and the whole process undergoes buffering, stagnation and remixing, so that the waveform change of the amount of sand discharged is smaller, thereby making the amount of sand discharged more uniform.

Description

Technical Field

[0001] The invention relates to the technical field of 3D printing, and in particular to a sand spreading device. Background Art

[0002] At present, there are roughly two types of conventional sand spreaders used in 3D printing equipment. One is a unidirectional sand spreader, which has low printing efficiency; the other is a bidirectional sand spreader, which can achieve bidirectional sand spreading and doubles the efficiency. However, two sand discharge ports are generally set. During the bidirectional sand spreading process, the two sand discharge ports work separately. This structure is complex and occupies a large space. In addition, the existing sand spreaders generally have poor controllability of the sand discharge amount, and there are a series of problems such as no sand discharge, sand leakage, and uneven sand discharge, which seriously affect the printing quality. Summary of the invention

[0003] The purpose of the present invention is to provide a sand spreading device with a double-layer sand discharging port, especially an upper layer with staggered sand discharging ports, so that the sand has good fluidity and does not leak when in use; combined with the sand discharging port of the lower layer sand plate, two-way sand spreading can be achieved, and the amount of sand discharging is well controllable, and there will be no situation of sand leaking, no sand discharging or uneven sand discharging.

[0004] To achieve the above object, the present invention provides a sand spreading device.

[0005] It comprises a sand paving device base and a sand paving device frame between the sand paving device bases, wherein a sand storage bin is arranged between the sand paving device frames.

[0006] The lower part of the sand storage bin is provided with a double-layer sand discharge opening, which is an upper staggered sand discharge opening and a lower sand plate sand discharge opening;

[0007] The upper layer staggered lower sand opening comprises a left lower sand plate and a right lower sand plate arranged crosswise with each other, and the two form a horizontal staggered opening at the bottom position. An adjusting mechanism is also fixedly arranged on the outer side of the left lower sand plate and / or the right lower sand plate, and the adjusting mechanism can adjust the vertical position of the left lower sand plate and / or the right lower sand plate, so that the vertical spacing of the horizontal staggered opening is adjustable; a vibration device is arranged on one side of the left lower sand plate or the right lower sand plate, and when the sand is laid, the sand flows out from the horizontal staggered opening and enters the lower sand opening of the lower laminated sand plate below;

[0008] The lower sand opening of the lower layer sand pressing plate includes left and right sand pressing plates, a vertical sand opening is arranged between the sand pressing plates on both sides, and the width of the vertical sand opening is adjustable; the sand pressing plates on both sides are fixedly connected to the sand spreading device frame through support members arranged on both sides below the sand spreading device frame.

[0009] Preferably, it also includes a two-way sand-laying mechanism, which is located on the side of the sand-laying machine. The two-way sand-laying mechanism is fixedly connected to the sand-laying machine frame through a cylinder support seat. A cylinder is fixed on the cylinder support seat. The piston rod of the cylinder is hinged to a vertical support rod fixedly arranged on the sand-laying machine base. When in working state, the extension and retraction of the cylinder can drive the sand-laying machine frame to swing within a certain range.

[0010] Preferably, L-shaped sand receiving plates are provided between the sand pressing plates on both sides and the supporting members on both sides. The two L-shaped sand receiving plates are generally arranged in a funnel shape and are used to guide the sand flowing out of the staggered lower sand openings of the upper layer into the lower sand openings of the sand pressing plates of the lower layer.

[0011] Preferably, the adjustment mechanism is connected to the sand spreading device frame.

[0012] Preferably, the adjustment mechanism is fixedly connected to the sanding machine frame via an adjustment support, the adjustment support is provided with an adjustment screw rod which is consistent with the inclination direction of the left lower sanding plate or the right lower sanding plate, the adjustment screw rod is provided with an adjustment block which can slide along its axial direction, the adjustment block is provided with a support sheet metal, and the left lower sanding plate or the right lower sanding plate is arranged on the support sheet metal; in the working state, the vertical position of the left lower sanding plate or the right lower sanding plate is adjusted by twisting the adjustment screw rod.

[0013] Preferably, the adjustment mechanism is fixedly connected to the sand spreading device frame via a fixed support, a fixed plate is fixedly provided on the fixed support, the left lower sanding plate or the right lower sanding plate is provided on the fixed plate, a waist-shaped hole is provided on the left lower sanding plate or the right lower sanding plate, and it is vertically adjustably connected to the fixed plate via the waist-shaped hole.

[0014] Preferably, the vibration device includes a driving motor arranged on the sand spreading device frame and a vibration shaft and an eccentric sleeve that cooperate with each other, the driving motor is connected to the vibration shaft, and a first connecting rod assembly is fixedly provided on the outside of the eccentric sleeve; the first connecting rod assembly includes a first connecting rod fixedly provided on the outside of the eccentric sleeve and a second connecting rod hinged thereto, a third connecting rod is also fixedly provided on the second connecting rod, the left lower sand plate or the right lower sand plate is fixedly provided on the third connecting rod, the third connecting rod is hinged to the first connecting rod fixing seat, the first connecting rod fixing seat is fixedly connected to the sand spreading device frame, the connecting line formed by the hinge point of the third connecting rod and the first connecting rod fixing seat and the hinge point of the first connecting rod and the second connecting rod forms an angle with the connecting surface of the third connecting rod and the left lower sand plate or the right lower sand plate.

[0015] Preferably, the left lower sanding plate and the right lower sanding plate are both fixedly connected to the vibration device.

[0016] Preferably, the vibration device includes a driving motor arranged on the sand spreading device frame and a vibration shaft and an eccentric sleeve that cooperate with each other, the driving motor is connected to the vibration shaft, and a first connecting rod assembly is also fixedly provided on the outside of the eccentric sleeve; the first connecting rod assembly includes a first connecting rod fixedly arranged on the outside of the eccentric sleeve and a second connecting rod hinged therewith, a third connecting rod is also fixedly provided on the second connecting rod, the third connecting rod is fixedly connected to the connecting seats on both sides, and the other side of the connecting seats on both sides is fixedly connected to the second connecting rod assembly, the second connecting rod assembly includes a fourth connecting rod and a fifth connecting rod fixedly connected, the fifth connecting rod is hinged to the second connecting rod fixing seat, and the second connecting rod fixing seat is fixedly connected to the sand spreading device frame; the left lower sand plate and the right lower sand plate are respectively fixedly arranged on the inner sides of the third connecting rod and the fourth connecting rod; the connecting line formed by the hinge points of the first connecting rod and the second connecting rod and the hinge points of the fifth connecting rod and the second connecting rod fixing seat forms an angle with the inner side surface of the fourth connecting rod.

[0017] Preferably, a conveying mechanism for conveying sand into the sand pavement is separately provided above the sand pavement frame, and the length of the conveying mechanism matches the length of the sand pavement frame. In working state, when the sand pavement frame moves below the conveying mechanism, or when the conveying mechanism moves above the sand pavement frame, the conveying mechanism drops the carried particles into the sand storage bin in the sand pavement frame.

[0018] Preferably, the conveying mechanism includes a conveying motor, a spiral conveying rod, a synchronous belt, and a sand conveying tank. The spiral conveying rod is arranged along the long axis direction of the sand conveying tank, and the conveying motor is connected to the spiral conveying rod through the synchronous belt. The sand conveying tank is provided with a sand replenishing port along the long axis direction, and the sand conveying tank drops the carried particles into the sand storage bin in the sand paving device frame through the sand replenishing port.

[0019] Preferably, the conveying mechanism further includes a blocking bar and a blocking bar driving device for driving the blocking bar to move, the blocking bar matches the sand replenishing port and is used to close the sand replenishing port, and the blocking bar driving device drives the blocking bar to close or open the sand replenishing port.

[0020] Preferably, the blocking strip driving device comprises a driving cylinder, a rocking rod and a swing arm, the swing arm is arranged at both ends of the blocking strip, the rocking rod is fixedly connected to the swing arm, and the driving cylinder drives the rocking rod to swing, thereby driving the blocking strip to swing.

[0021] The present invention provides a sand spreading device, wherein a double-layer sand outlet is provided below the sand storage bin, which are an upper staggered sand outlet and a lower laminated sand plate sand outlet; the upper staggered sand outlet includes a left lower sand plate and a right lower sand plate arranged crosswise with each other, and the two form a horizontal staggered outlet at the bottom position, and in the working state, the vibration device drives the left lower sand plate or the right lower sand plate to vibrate, so that the sand flows out from the staggered outlet and enters the lower sand outlet of the lower laminated sand plate below. The upper staggered sand outlet will not drop sand when not in working state, thereby significantly reducing the sand loss of the sand spreading device, and will not cause the accumulation of residual sand inside the printer, and the printing effect is significantly improved; and during vibration, the sand of the staggered sand outlet falls as outflow, so the sand is more evenly dropped, and there will be no sand drop fault phenomenon, thereby ensuring the continuity and smoothness of printing. Moreover, the staggered left lower sand plate and the right lower sand plate are arranged in an inclined manner to make the sand more fluid and avoid sand failure.

[0022] At the same time, the vertical spacing of the horizontal staggered openings is adjustable, which can conveniently control the amount of sand discharged.

[0023] The lower layer sand pressing plate sanding opening is also arranged below the upper layer staggered sanding opening, which includes left and right sand pressing plates, and a vertical sanding opening is arranged between the sand pressing plates on both sides. The width of the vertical sanding opening is adjustable, which further facilitates the control of the sanding amount.

[0024] When in working state, the sand falling from the upper staggered sand outlet hits the side wall of the lower sand outlet, and then flows out from the lower sand outlet. The whole process undergoes a process of buffering, stagnation and remixing, which makes the waveform of the sand discharge amount change smaller, and thus the sand discharge amount is more uniform.

[0025] In a specific embodiment, the vibration device includes a driving motor arranged on the sand spreading device frame and a vibration shaft and an eccentric sleeve that cooperate with each other, the driving motor is connected to the vibration shaft, and a first connecting rod assembly is fixedly provided on the outside of the eccentric sleeve; the first connecting rod assembly includes a first connecting rod fixedly provided on the outside of the eccentric sleeve and a second connecting rod hinged thereto, a third connecting rod is also fixedly provided on the second connecting rod, the left lower sand plate or the right lower sand plate is fixedly provided on the third connecting rod, the third connecting rod is hinged to the first connecting rod fixing seat, the first connecting rod fixing seat is fixedly connected to the sand spreading device frame, the connecting line formed by the hinge point of the third connecting rod and the first connecting rod fixing seat and the hinge point of the first connecting rod and the second connecting rod forms an angle with the connecting surface between the third connecting rod and the left lower sand plate or the right lower sand plate.

[0026] The vibration device is connected to the left lower sand plate or the right lower sand plate through the first connecting rod assembly. The first connecting rod assemblies are hinged to convert vibration into linear displacement, so the overall synchronization of the lower sand plate is better, resulting in a more uniform amount of sand. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0028] Figure 1 A three-dimensional schematic diagram of a sand spreading device in a first specific embodiment provided by the present invention;

[0029] Figure 2 for Figure 1 A partial enlarged view of the lower sand mouth of the middle double layer;

[0030] Figure 3 for Figure 1 Left view of the middle sander;

[0031] Figure 4 for Figure 1 A three-dimensional schematic diagram of one side of the adjustment mechanism is provided;

[0032] Figure 5 for Figure 4 A partial enlarged view of the middle adjustment mechanism;

[0033] Figure 6 for Figure 1 A three-dimensional schematic diagram of a side with a vibration device

[0034] Figure 7 for Figure 6 A partial enlarged view of the middle vibration device and the first connecting rod assembly;

[0035] Figure 8 for Figure 1 Cross-section of the middle sander;

[0036] Fig. 9 is a cross-sectional view of a sand spreading device having a second adjustment mechanism;

[0037] Fig.10 It is a cross-sectional view of a sand spreading machine with a bidirectional vibration mode;

[0038] Fig.11 A schematic diagram of a three-dimensional structure of a separately arranged conveying mechanism in a specific embodiment provided by the present invention;

[0039] Fig.12 for Fig.11 A cross-sectional view of

[0040] Fig.13 for Fig.11Diagram of the coordinated working status of the conveying mechanism and the sand spreading device.

[0041] Figures 1 to 13 The reference numerals in the figures are as follows:

[0042] 101-synchronous belt, 102-transport motor mounting seat, 103-transport motor, 105-screw conveyor rod, 106-sand conveying tank, 107-driving cylinder, 108-swing rod, 109-swing arm, 111-sealing strip, 112-sand replenishing port, 201-cylinder support seat, 202-cylinder, 203-vertical support rod base, 205-vertical support rod, 301-vibration shaft, 302-eccentric sleeve, 303-first connecting rod, 304-second connecting rod, 305-first connecting rod Fixed seat, 306-third connecting rod, 307-left lower sanding plate, 313-two side connecting seats, 310-fourth connecting rod, 311-fifth connecting rod, 312-second connecting rod fixed seat, 401-right lower sanding plate, 402-support sheet metal, 403-adjusting block, 404-adjusting support, 405-adjusting screw, 406-fixed support, 407-fixed plate, 501-sanding device base, 502-sanding device frame, 503-support, 504-connecting plate, 505-sand pressing plate. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] The core of the present invention is to provide a sand spreading device with a double-layer sand discharging port, especially an upper layer with staggered sand discharging ports, which has good sand fluidity and no sand leakage during use; combined with the sand discharging port of the lower layer sand plate, two-way sand spreading can be achieved, and the amount of sand discharging is well controllable, and there will be no sand leakage, no sand discharging or uneven sand discharging.

[0045] Please refer to Figure 1-13 , Figure 1 A three-dimensional schematic diagram of a sand spreading device in a first specific embodiment provided by the present invention; Figure 2 for Figure 1 A partial enlarged view of the lower sand mouth of the middle double layer; Figure 3 for Figure 1 Left view of the middle sander; Figure 4 for Figure 1 A three-dimensional schematic diagram of one side of the adjustment mechanism is provided; Figure 5 for Figure 4 A partial enlarged view of the middle adjustment mechanism; Figure 6 for Figure 1A three-dimensional schematic diagram of one side of a vibration device is provided; Figure 7 for Figure 6 A partial enlarged view of the middle vibration device and the first connecting rod assembly; Figure 8 for Figure 1 Cross-section of the middle sander; Fig. 9 is a cross-sectional view of a sand spreading device having a second adjustment mechanism; Fig.10 It is a cross-sectional view of a sand spreading machine with a bidirectional vibration mode; Fig.11 A schematic diagram of a three-dimensional structure of a separately arranged conveying mechanism in a specific embodiment provided by the present invention; Fig.12 for Fig.11 A cross-sectional view of Fig.13 for Fig.11 Diagram of the coordinated working status of the conveying mechanism and the sand spreading device.

[0046] In a specific embodiment, the sand spreader provided by the present invention includes a sand spreader base 501 and a sand spreader frame 502 located therebetween. The sand spreader base 501 is used to support the sand spreader frame 502 , and one sand spreader base 501 is usually provided on each side of the sand spreader frame 502 .

[0047] A sand storage bin is arranged in the sand spreading device frame 502, and a double-layer sand discharge opening is arranged below the sand storage bin, namely an upper staggered sand discharge opening and a lower pressed sand plate sand discharge opening.

[0048] The upper staggered lower sand opening includes a left lower sand plate 307 and a right lower sand plate 401 which are arranged crosswise with each other, and the two form a horizontal staggered opening at the bottom, and either the bottom of the left lower sand plate 307 is on top, or the bottom of the right lower sand plate 401 is on top.

[0049] When necessary, the upper staggered lower sand opening is in a zigzag rotation shape, that is, there are at least two left lower sand plates and at least two right lower sand plates to form a zigzag staggered opening.

[0050] The vertical spacing of the horizontal staggered openings is adjustable, that is, the amount of sand discharged from the upper staggered sand discharge openings is controllable. There are many specific adjustment methods, which will be described in detail below.

[0051] A vibration device is provided on one side of the left lower sanding plate 307 or the right lower sanding plate 401, and the vibration device enables the sand to flow out from the staggered opening and enter the lower sanding opening of the lower laminated sanding plate below.

[0052] The staggered sand outlets are set so that sand will not fall out of the upper sand outlet when the sand spreader is not in operation, and the sand spreader will not leak sand when not sanding, which reduces unnecessary sand loss and does not cause the printer to leak sand and cause internal residual sand to accumulate, and the printing effect is significantly improved; the staggered sand outlets only drop sand when sanding is in operation, and the sand at the staggered sand outlets is accumulated at a certain angle. When the sand spreader starts the sand spreading movement, the accumulation angle changes from a static accumulation angle to a dynamic accumulation angle, and the sand starts to flow. This method makes the sand fall more evenly, and there is no sand falling fault phenomenon, thereby ensuring the continuity and smoothness of printing. At the same time, the tilted setting of the left and right lower sand plates makes the sand more fluid and can avoid sand failure. In addition, the adjustable vertical spacing of the staggered outlets can conveniently control the amount of sand dropped.

[0053] The lower sand opening of the lower layer sand pressing plate includes a sand pressing plate 505 arranged on the left and right sides, and a vertical sand opening is arranged between the sand pressing plates 505 on both sides, that is, a straight sand outlet, and sand finally flows out from the sand outlet. The sand pressing plates 505 on both sides are fixedly connected to the sand paving frame 502 through the support members 503 arranged on both sides below the sand paving frame 502, that is, one side of the sand pressing plate 505 is fixedly connected to the sand paving frame 502 through the support member 503 on one side. Because the length direction distance of the sand paving is large, multiple support members 503 can be set as needed, and the two sides are symmetrically arranged, and the specific shape of the support member 503 is not limited.

[0054] In addition, to facilitate further adjustment of the amount of sand produced, the width of the vertical sand outlet in the sand spreader is set to be adjustable, which can be achieved through a movable connection within a certain horizontal range between the support member 503 and the sand spreader frame 502, or an adjustable connection between the sand pressing plate 505 and the support member 503.

[0055] When the above-mentioned sand spreading machine with double-layer sand discharge ports is in working state, the sand falling from the upper staggered sand discharge ports hits the side wall of the lower sand discharge ports, and then flows out from the lower sand discharge ports. The whole process undergoes a process of buffering, stagnation and remixing, so that the waveform change of the sand discharge amount caused by vibration is smaller, and the sand discharge amount is more uniform.

[0056] On the basis of the above-mentioned sand paving device, a two-way sand paving mechanism can be additionally provided, which is located on the side of the sand paving device. Usually, a two-way sand paving mechanism in the same direction can be provided on each side of the sand paving device. The two-way sand paving mechanism is fixedly connected to the sand paving device frame 502 through a cylinder support seat 201. A cylinder 202 is fixedly provided on the cylinder support seat 201. The piston rod of the cylinder 202 is hinged to a vertical support rod 205 fixedly provided on the sand paving device base 501. The upper end of the vertical support rod 205 may not be in contact with the sand paving device frame 502, but may also be slidably connected thereto. In the working state, the extension and contraction of the cylinder 202 can drive the sand paving device frame 502 to swing within a certain range. At this time, the outer sides of the bottom surfaces of the sand pressing plates 505 on both sides can be provided with rounded corners, chamfers or right angles for convenient swinging. The rounded corners can prevent the outer corners of the sand pressing plates 505 from interfering with the bottom plane of the sand paving device base 501 during the swinging process. In addition, the vertical support rod 205 can be fixedly connected to the sand spreading device base 501 through the vertical support rod base 203 .

[0057] When the above-mentioned two-way sand-laying mechanism is in use, different cylinder strokes can be adjusted according to different types of sand, so that the sand-laying device frame can swing within different angles. The two-way sand-laying mechanism cooperates with the double-layer sand-discharging port to achieve the effect of two-way sand-laying, and can control the flow of sand or stop the flow of sand, so that the sand is evenly distributed during the sand-laying work, and there is no situation where no sand is distributed, and no sand is leaked when the sand-laying work is not in progress.

[0058] Specifically, when the staggered sand openings of the upper layer are in the opposite direction to the sand spreading direction, the sand will flow out from the staggered sand openings to achieve sand spreading in one direction. When sand spreading in the opposite direction, when the two directions are the same, the two-way sand spreading mechanism can be used to drive the staggered sand openings to tilt as a whole. In this way, the sand will also flow out from the staggered sand openings, thereby achieving two-way sand spreading.

[0059] Compared with the prior art in which two sand lowering ports are provided to achieve two-way sand spreading, the above-mentioned sand spreading device only needs to provide one sand lowering port to cooperate with the two-way sand spreading mechanism to achieve two-way sand spreading, and occupies less space.

[0060] At the same time, the setting of the two-way sand spreading mechanism enables the sand pressing plate 505 to have a certain inclination angle when the sand spreading device is in use because of the swinging along with the sand spreading device frame 502, thus achieving a better sand pressing effect.

[0061] As an improvement, an L-shaped sand receiving plate can be arranged between the two sand pressing plates 505 and the two supporting members 503. The two L-shaped sand receiving plates are generally arranged in a funnel shape and are specifically arranged above the inner side of the two sand pressing plates 505. The L-shaped sand receiving plate is mainly used to guide the sand flowing out of the upper staggered lower sand opening into the lower sand opening of the lower sand pressing plate. At the same time, the arrangement of the L-shaped sand receiving plate can facilitate the overall horizontal arrangement of the sand pressing plates 505, thereby improving the sand pressing effect.

[0062] During the process of introducing sand, the L-shaped sand receiving plate causes the sand flowing out from the upper staggered sand pressing port to be buffered and integrated on the L-shaped sand receiving plate and the side walls of the vertical sand discharge port, thereby ensuring the uniformity of the sand flowing out from the vertical sand discharge port.

[0063] In particular, when a sand spreader with a bidirectional sand spreading mechanism is in use, when the sand spreader frame 502 swings, the upper staggered sand spreading openings and the lower vertical sand spreading openings both deviate from their original positions, and the sand may not be able to flow directly into the lower vertical sand spreading openings. At this time, the role of the L-shaped sand receiving plate is more prominent.

[0064] A connecting plate 504 for facilitating the installation of the L-shaped sand receiving plate may be further provided between the sand pressing plate 505 and the L-shaped sand receiving plate.

[0065] Furthermore, the L-shaped sand receiving plate and the support member 503 may be set to be adjustable, so that the L-shaped sand receiving plate can drive the sand pressing plate 505 to adjust, so that the width of the vertical sanding opening is adjustable. Specifically, a vertical waist-shaped hole may be set at the connection between the L-shaped sand receiving plate and the support member 503.

[0066] In a specific embodiment, the vertical spacing of the horizontal staggered openings is adjustable, which can be achieved by setting an adjustment mechanism on the outer side of the left lower sanding plate or the right lower sanding plate. The adjustment mechanism can adjust the vertical position of the left lower sanding plate or the right lower sanding plate, thereby driving the vertical spacing of the horizontal staggered openings to be adjustable.

[0067] Specifically, the adjustment mechanism is fixedly connected to the sanding machine frame 502 through an adjustment support 404, and an adjustment screw 405 is provided on the adjustment support 404, which is consistent with the inclination direction of the left lower sanding plate 307 or the right lower sanding plate 401, and an adjustment block 403 which can slide along its axial direction is provided on the adjustment screw 405, and a support sheet metal 402 is provided on the adjustment block 403, and the left lower sanding plate 307 or the right lower sanding plate 401 is set on the support sheet metal 402.

[0068] During the initial installation, the adjustment block 403 can be rotated to the lowest position on the adjustment screw 405, and then the support sheet metal 402 can be installed thereon, and the left lower sanding plate 307 or the right lower sanding plate 401 can be moved so that the gap between it and the lower sanding plate on the other side is uniform and the horizontal gap is consistent, and then it is fixed on the support sheet metal 402, and the installation of the adjustment mechanism is completed.

[0069] When changing the type of sand, it is necessary to adjust the gap between the left lower sand plate 307 and the right lower sand plate 401, and adjust the vertical position of the left lower sand plate 307 or the right lower sand plate 401 by turning the adjusting screw 405. The setting of the adjusting screw 405 makes the adjustment accuracy of the entire adjustment mechanism more accurate and controllable, and as long as the number of turns is consistent, the horizontal direction can be adjusted synchronously, and after being tested by the testing equipment, fine-tuning can be performed, which is fast and efficient.

[0070] In fact, to adjust the vertical spacing of the horizontal staggered openings, it is only necessary to adjust the vertical position of one of the left lower sand plate 307 or the right lower sand plate 401, so usually only an adjustment mechanism is set in one of them, but it is not ruled out that adjustment mechanisms are set in both sides.

[0071] Moreover, because the length of the left lower sanding plate 307 or the right lower sanding plate 401 is relatively large, it is usually necessary to set up several adjustment mechanisms at the same time so that the vertical position of the above-mentioned lower sanding plates as a whole is more consistent, and the gaps formed are consistent in the horizontal direction, which leads to more uniform gaps in the staggered sanding openings and uniform sanding amount in the horizontal direction.

[0072] There is another method of setting the adjustment mechanism:

[0073] The adjustment mechanism is fixedly connected to the sanding device frame 502 via a fixed support 406, a fixed plate 407 is fixedly provided on the fixed support 406, the left lower sanding plate 307 or the right lower sanding plate 401 is arranged on the fixed plate 407, and a vertical waist-shaped hole is provided on the left lower sanding plate 307 or the right lower sanding plate 401, and the waist-shaped hole realizes the vertical adjustable connection between the left lower sanding plate 307 or the right lower sanding plate 401 and the fixed plate.

[0074] In a specific embodiment, the vibration device in the sand paving device includes a driving motor disposed on the sand paving device frame 502 and a vibration shaft 301 and an eccentric sleeve 302 that cooperate with each other, and the driving motor is connected to the vibration shaft 301, thereby driving the eccentric sleeve 302 to rotate circumferentially along the vibration shaft 301. Usually, multiple vibration devices are provided at the same time, and they and the adjustment mechanism work independently without affecting each other, so the two can be distributed on the same side of the sand paving device frame 502, or on both sides thereof.

[0075] In the prior art, the above-mentioned vibration device is usually directly connected to the left lower sand plate 307 or the right lower sand plate 401, and the vibration device itself vibrates at a certain frequency. However, multiple vibration devices are arranged in the long-axis direction and each vibration device vibrates separately, which easily leads to asynchronous vibration. The vibration frequency is directly related to the amount of sand deposited. This inconsistent vibration frequency in the long-axis direction will lead to uneven amount of sand deposited. In the sand spreader provided by the present invention, the vibration device is indirectly connected to the left lower sand plate 307 or the right lower sand plate 401 through a first connecting rod assembly.

[0076] Specifically, a connecting rod assembly is arranged outside the eccentric sleeve 302, and the vibration device is connected to the left lower sand plate 307 or the right lower sand plate 401 through the first connecting rod assembly. The first connecting rod assembly includes a first connecting rod 303 fixedly arranged outside the eccentric sleeve 302 and a second connecting rod 304 hinged to the lower end thereof, and a third connecting rod 306 is also fixedly arranged on the second connecting rod 304, and the upper end of the third connecting rod 306 is hinged to the first connecting rod fixing seat 305, and the first connecting rod fixing seat 305 is fixedly connected to the sanding device frame 502, and at the same time, the left lower sand plate 307 or the right lower sand plate 401 is fixedly arranged on the third connecting rod 306.

[0077] The connecting line formed by the hinge point of the third connecting rod 306 and the first connecting rod fixing seat 305 and the hinge point of the first connecting rod 303 and the second connecting rod 304 forms an angle with the connecting surface of the third connecting rod 306 and the left lower sand plate 307 or the right lower sand plate 401, that is, a triangle is formed, so that the eccentric sleeve 302 drives the second connecting rod 304, and then links the third connecting rod 306 to swing, and the third connecting rod 306 drives the left lower sand plate 307 or the right lower sand plate 401 to swing.

[0078] The greater the distance between the hinge point of the third connecting rod 306 and the first connecting rod fixing seat 305 and the lower end of the left lower sand plate 307 or the right lower sand plate 401, the greater the amplitude, the amplitude is proportional to the amount of sand, the vibration frequency of the vibration device is proportional to the amount of sand, and the eccentricity of the eccentric sleeve 302 is proportional to the amount of sand, so the amount of sand can be changed by changing the amplitude, vibration frequency or eccentricity. Based on the principle that the amplitude of the structural design is not too large, an eccentric sleeve 302 with a larger eccentricity can be selected within a reasonable range, or the vibration frequency can be increased. The above-mentioned first connecting rod assembly uses the hinge principle to convert vibration into linear displacement, so that the left lower sand plate 307 or the right lower sand plate 401 moves regularly under the drive of the vibration device, so the overall synchronization of the lower sand plate is better, which leads to a more uniform amount of sand. Increasing the amount of sand can increase the translation speed of the sand paving machine, thereby improving printing efficiency.

[0079] As an improvement, the left lower sand plate 307 and the right lower sand plate 401 can also be fixedly connected to the vibration device at the same time. The structure of the vibration device can be the same as the vibration device in the above implementation. The specific arrangement of other structures is as follows:

[0080] The third connecting rod 306 is fixedly connected to the connecting seats 313 on both sides, and the other side of the connecting seats 313 on both sides is fixedly connected to the second connecting rod assembly, and the second connecting rod assembly includes a fourth connecting rod 310 and a fifth connecting rod 311 fixedly connected to each other, and the connecting seats 313 on both sides can penetrate the fourth connecting rod 310 and connect with the fifth connecting rod 311, and the upper end of the fifth connecting rod 311 is hinged to the second connecting rod fixing seat 312, and the second connecting rod fixing seat 312 is fixedly connected to the sand paving machine frame 502, and is located on the other side of the sand paving machine frame 502 opposite to the vibration device; the left lower sanding plate 307 or the right lower sanding plate 401 is respectively fixed on the inner side of the third connecting rod 306 and the fourth connecting rod 310.

[0081] At the same time, the line formed by the hinge points of the first connecting rod 303 and the second connecting rod 304 and the hinge points of the fifth connecting rod 311 and the second connecting rod fixing seat 312 forms an angle with the inner side surface of the fourth connecting rod 310, that is, a triangle is formed, so that the eccentric sleeve 302 drives the second connecting rod 304 to link the third connecting rod 306, and then links the lower sand plates on both sides to swing together through the connecting seats 313 on both sides, that is, the second connecting rod 304, the third connecting rod 306, the connecting seats 313 on both sides, the fourth connecting rod 310 and the fifth connecting rod 311 are connected as a whole and swung.

[0082] The greater the distance between the hinge point where the upper end of the fifth connecting rod 311 is hinged to the second connecting rod fixing seat 312 and the lower end of the lower sand plate on the same side, the greater the amplitude, that is, the greater the distance between the hinge point where the upper end of the fifth connecting rod 311 is hinged to the second connecting rod fixing seat 312 and the lower end of the lower sand plate fixed to the fourth connecting rod 310, the greater the amplitude, the amplitude is proportional to the amount of sand, the vibration frequency of the vibrating device is proportional to the amount of sand, and the eccentricity of the eccentric sleeve 302 is proportional to the amount of sand, so the amount of sand can be changed by changing the amplitude, vibration frequency or eccentricity. Based on the principle that the amplitude of the structural design is not easy to be too large, an eccentric sleeve 302 with a larger eccentricity can be selected within a reasonable range, or the vibration frequency can be increased.

[0083] At this time, the second connecting rod assembly is connected to the first connecting rod assembly through the connecting seats 313 on both sides in a hinged manner, so that the vibration device arranged on one side of the left lower sanding plate 307 or the right lower sanding plate 401 can simultaneously drive the lower sanding plates on both sides to move regularly, and the vibration is converted into linear offset, which leads to a more uniform amount of sanding.

[0084] This method of driving the lower sanding plates on both sides to move regularly actually enables the sand spreading device to still spread sand in both directions when there is no two-way sand spreading mechanism.

[0085] Usually we prefer to set the vibration device on the side of the sanding plate where the staggered sanding ports are located below, so that the vibration effect and sanding effect are the best.

[0086] The above-mentioned sand spreader may also include a conveying mechanism above the sand spreader frame 502, which is used to convey sand into the sand spreader. Specifically, the conveying mechanism and the sand spreader frame 502 may be fixedly connected or separately arranged. When fixedly connected, they may be connected via a conveying motor mounting bracket 102.

[0087] In a specific embodiment, a conveying mechanism for conveying sand into the sand spreader is separately provided above the sand spreader frame 502, and the length of the conveying mechanism matches the length of the sand spreader frame 502. When in working state, the sand spreader frame 502 moves to spread sand. When the sand spreader frame 502 moves below the conveying mechanism, or when the conveying mechanism moves above the sand spreader frame 502, the conveying mechanism drops the carried particles into the sand storage bin in the sand spreader frame 502.

[0088] The conveying mechanism may include a conveying motor 103, a spiral conveying rod 105, a synchronous belt 101, a sand conveying tank 106, and a sand replenishing port 112. The spiral conveying rod 105 is arranged along the long axis direction of the sand conveying tank 106. The conveying motor 103 is connected to the spiral conveying rod 105 through the synchronous belt 101. The sand conveying tank 106 is provided with a sand replenishing port 112 along the long axis direction. The sand conveying tank 106 drops the carried particles into the sand storage bin in the sand paving frame 502 through the sand replenishing port 112. The sand replenishing port 112 may be arranged at the upper part, and the sand conveying tank 106 may be tilted so that the particles fall from the sand replenishing port into the sand storage bin in the sand paving frame 502.

[0089] Furthermore, the conveying mechanism may also include a blocking strip 111 and a blocking strip driving device for driving the blocking strip 111 to move, wherein the blocking strip 111 matches the sand replenishing port 112 and is used to close the sand replenishing port 112, and the blocking strip driving device drives the blocking strip 111 to close or open the sand replenishing port 112.

[0090] The blocking strip driving device may include a driving cylinder 107, a rocking arm 108, and a swing arm 109. The swing arms 109 are arranged at both ends of the blocking strip 111. The rocking arm 108 is fixedly connected to the swing arm 109. The driving cylinder 107 drives the rocking arm 108 to swing, that is, drives the blocking strip 111 to swing.

[0091] This conveying mechanism is separated from the sand spreading machine frame, which can prevent the spiral conveying rod 105 from causing pressure on the sand in the sand storage bin, thereby avoiding pressure on the sand spreading part and affecting the sand spreading effect. At the same time, it can reduce the weight of the sand spreading part of the sand spreading machine and further increase the speed of the sand spreading part of the sand spreading machine.

[0092] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0093] The sand spreading device provided by the present invention is introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A sand paving machine, comprising a sand paving machine base and a sand paving machine frame between the sand paving machine base, wherein a sand storage bin is arranged between the sand paving machine frames, characterized in that: The lower part of the sand storage bin is provided with a double-layer sand discharge opening, which is an upper staggered sand discharge opening and a lower sand plate sand discharge opening; The upper staggered lower sand opening includes a left lower sand plate and a right lower sand plate arranged crosswise with each other, and the two form a horizontal staggered opening at the bottom position. An adjustment mechanism is also fixed on the outer side of the left lower sand plate and / or the right lower sand plate, and the adjustment mechanism can adjust the vertical position of the left lower sand plate and / or the right lower sand plate, so that the vertical spacing of the horizontal staggered opening is adjustable; The vibration device is arranged on one side of the left lower sand plate or the right lower sand plate. When the sand is laid, the sand flows out from the horizontal staggered opening and enters the lower sand opening of the lower laminated sand plate below; The lower sanding opening of the lower layer sand pressing plate includes left and right sand pressing plates, a vertical sanding opening is arranged between the sand pressing plates on both sides, and the width of the vertical sanding opening is adjustable; the sand pressing plates on both sides are fixedly connected to the sanding device frame through support members arranged on both sides below the sanding device frame; L-shaped sand receiving plates are arranged between the sand pressing plates on both sides and the supporting members on both sides. The two L-shaped sand receiving plates are generally arranged in a funnel shape and are used to guide the sand flowing out of the staggered lower sand openings of the upper layer into the lower sand openings of the sand pressing plates of the lower layer.

2. The sand spreading device according to claim 1, characterized in that: It also includes a two-way sand-laying mechanism, which is located on the side of the sand-laying machine. The two-way sand-laying mechanism is fixedly connected to the sand-laying machine frame through a cylinder support seat. A cylinder is fixed on the cylinder support seat. The piston rod of the cylinder is hinged to a vertical support rod fixedly arranged on the sand-laying machine base. When in working state, the extension and retraction of the cylinder can drive the sand-laying machine frame to swing within a certain range.

3. The sand spreading device according to claim 1, characterized in that: The adjusting mechanism is connected to the sand spreading device frame.

4. The sand spreading device according to claim 3, characterized in that: The adjusting mechanism is fixedly connected to the sanding device frame through an adjusting support, the adjusting support is provided with an adjusting screw rod which is consistent with the inclination direction of the left lower sanding plate or the right lower sanding plate, the adjusting screw rod is provided with an adjusting block which can slide along its axial direction, the adjusting block is provided with a supporting sheet metal, and the left lower sanding plate or the right lower sanding plate is arranged on the supporting sheet metal; in the working state, the vertical position of the left lower sanding plate or the right lower sanding plate is adjusted by twisting the adjusting screw rod.

5. The sand spreading device according to claim 3, characterized in that: The adjusting mechanism is fixedly connected to the sand spreading device frame via a fixed support, a fixed plate is fixedly arranged on the fixed support, the left lower sanding plate or the right lower sanding plate is arranged on the fixed plate, a waist-shaped hole is arranged on the left lower sanding plate or the right lower sanding plate, and the waist-shaped hole is vertically adjustably connected to the fixed plate via the waist-shaped hole.

6. The sand spreading device according to any one of claims 1 to 5, characterized in that: The vibration device includes a driving motor arranged on the sand spreading device frame and a vibration shaft and an eccentric sleeve that cooperate with each other, the driving motor is connected to the vibration shaft, and a first connecting rod assembly is fixedly provided on the outside of the eccentric sleeve; the first connecting rod assembly includes a first connecting rod fixedly provided on the outside of the eccentric sleeve and a second connecting rod hinged thereto, a third connecting rod is also fixedly provided on the second connecting rod, the left lower sand plate or the right lower sand plate is fixedly provided on the third connecting rod, the third connecting rod is hinged to the first connecting rod fixing seat, the first connecting rod fixing seat is fixedly connected to the sand spreading device frame, the connecting line formed by the hinge point of the third connecting rod and the first connecting rod fixing seat and the hinge point of the first connecting rod and the second connecting rod forms an angle with the connecting surface of the third connecting rod and the left lower sand plate or the right lower sand plate.

7. The sand spreading device according to any one of claims 1 to 5, characterized in that: The left lower sanding plate and the right lower sanding plate are both fixedly connected to the vibration device.

8. The sand spreading device according to claim 7, characterized in that: The vibration device includes a driving motor arranged on the sand spreading device frame and a vibration shaft and an eccentric sleeve that cooperate with each other, the driving motor is connected to the vibration shaft, and a first connecting rod assembly is fixedly provided on the outer side of the eccentric sleeve; the first connecting rod assembly includes a first connecting rod fixedly arranged on the outer side of the eccentric sleeve and a second connecting rod hinged therewith, a third connecting rod is also fixedly provided on the second connecting rod, the third connecting rod is fixedly connected to the connecting seats on both sides, and the other side of the connecting seats on both sides is fixedly connected to the second connecting rod assembly, the second connecting rod assembly includes a fourth connecting rod and a fifth connecting rod fixedly connected, the fifth connecting rod is hinged to the second connecting rod fixing seat, and the second connecting rod fixing seat is fixedly connected to the sand spreading device frame; the left lower sand plate and the right lower sand plate are respectively fixedly arranged on the inner sides of the third connecting rod and the fourth connecting rod; the connecting line formed by the hinge points of the first connecting rod and the second connecting rod and the hinge points of the fifth connecting rod and the second connecting rod fixing seat forms an angle with the inner side surface of the fourth connecting rod.

9. The sand spreading device according to claim 1, characterized in that: A conveying mechanism for conveying sand into the sand paver is also separately arranged above the sand paver frame, and the length of the conveying mechanism matches the length of the sand paver frame. In working state, when the sand paver frame moves below the conveying mechanism, or when the conveying mechanism moves above the sand paver frame, the conveying mechanism drops the carried particles into the sand storage bin in the sand paver frame.

10. The sand spreading device according to claim 9, characterized in that: The conveying mechanism includes a conveying motor, a spiral conveying rod, a synchronous belt, a sand conveying tank, and a sand replenishing port. The spiral conveying rod is arranged along the long axis direction of the sand conveying tank. The conveying motor is connected to the spiral conveying rod through the synchronous belt. The sand conveying tank is provided with a sand replenishing port along the long axis direction. The sand conveying tank drops the carried particles into the sand storage bin in the sand spreading device frame through the sand replenishing port.

11. The sand spreading device according to claim 10, characterized in that: The conveying mechanism also includes a blocking bar and a blocking bar driving device for driving the blocking bar to move, the blocking bar matches the sand replenishing port and is used to close the sand replenishing port, and the blocking bar driving device drives the blocking bar to close or open the sand replenishing port.

12. The sand spreading device according to claim 11, characterized in that: The blocking strip driving device comprises a driving cylinder, a rocking rod and a swing arm. The swing arms are arranged at both ends of the blocking strip. The rocking rod is fixedly connected to the swing arm. The driving cylinder drives the rocking rod to swing, that is, drives the blocking strip to swing.

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