Sand screening device with multi-stage screening function for building construction

Abstract

The sand screening device with the multi-stage screening function for building construction comprises a bearing frame, a screening shell is flexibly connected to the bearing frame, a plurality of screening plates distributed in a stacked mode in the vertical direction are fixed in an inner cavity of the screening shell, the screening plates are obliquely arranged, and a material uniformizing assembly for dynamically adjusting the thickness of sand on the corresponding screening plates is arranged. The material uniformizing assembly is arranged on the surface of the screening plate on the uppermost layer, and the material uniformizing assembly and the screening plate are arranged in parallel. The material uniformizing assembly comprises two transmission rollers and a conveying belt wrapping the surfaces of the two transmission rollers, a rectangular face formed by supporting of the two transmission rollers is parallel to the corresponding screening plate, and a plurality of sand combing parts distributed at equal intervals are fixed to the surface of the conveying belt. According to the material uniformizing assembly, the sand and stones fed for the first time are evenly distributed, the screening efficiency and accuracy are improved, the problems of material accumulation, equipment abrasion, screen mesh blockage and the like are solved, the screening process is optimized, and the service life of equipment is prolonged.

Description

Technical Field

[0001] The invention relates to the field of building construction, in particular to a sand screening device with a multi-stage screening function for building construction. Background Art

[0002] As a common material screening equipment, multi-stage sand screening device is widely used in the construction field. In actual use, the uniformity of feeding plays a key role in screening efficiency and screening quality. However, many sand screening devices currently have problems such as uneven feeding, material accumulation, and excessive local load when feeding for the first time. This uneven feeding method will lead to uneven distribution of sand and gravel on the screen surface, affecting the thoroughness of screening and the service life of the screen.

[0003] Traditional sand screening devices often lack effective means of regulating the uniformity of feeding. When excessive amounts of sand and gravel are fed at one time, it will not only cause the screen to become clogged, but may also cause abnormal vibration frequency of the equipment and damage to components. At the same time, due to the accumulation or uneven distribution of sand and gravel, the screening vibration cannot fully act on the sand and gravel particles, resulting in reduced screening efficiency, and even requiring repeated screening or rework, which increases production costs and energy consumption.

[0004] Therefore, in order to solve the above problems, a sand screening device with a multi-stage screening function is provided for construction. Summary of the invention

[0005] The invention provides a sand screening device with a multi-stage screening function for construction in order to solve the problems of uneven material feeding, material accumulation and screen blockage that are common in existing sand screening devices during initial material feeding.

[0006] The present invention solves the above technical problems through the following technical solutions: The present invention provides a sand screening device with a multi-stage screening function for construction, comprising a bearing frame, a sub-screen shell flexibly connected to the bearing frame, a plurality of sub-screen plates vertically stacked and distributed are fixed in the inner cavity of the sub-screen shell, and the sub-screen plates are inclined, a plurality of evenly distributed sieve holes are opened on the sub-screen plates, and the sieve hole diameters of the sub-screen plates decrease from top to bottom; A material leveling component dynamically adjusts the thickness of the sand material on the corresponding sub-screen plate, wherein the material leveling component is arranged on the surface of the uppermost sub-screen plate, and the material leveling component and the sub-screen plate are arranged parallel to each other; The material leveling assembly includes two driving rollers and a conveyor belt wrapped around the surfaces of the two driving rollers. The rectangular surface supported by the two driving rollers is arranged parallel to the corresponding sub-screen plates. A plurality of equally spaced combing parts are fixed on the surface of the conveyor belt.

[0007] The material leveling component can be used to level the sand material initially fed into the sand screening device, thereby avoiding the problem of too much sand being fed at one time, resulting in incomplete initial screening, which in turn has an adverse effect on subsequent screening.

[0008] In the technical solution, a material dividing shell is provided at the lower side of the sub-screen plate, and the material dividing shell is provided with material discharge channels whose number is the same as the number of the sub-screen plates, and the material discharge channels correspond to the sub-screen plates one by one; A collecting hopper is arranged at the bottom of the sub-screening shell, and the collecting hopper is fixed on the supporting frame.

[0009] The sand material screened by each sub-screen plate flows out through the corresponding discharge channel.

[0010] Specifically, two connecting blocks are fixed on the outer walls of both sides of the sub-screen shell, and a plurality of bearing springs are fixed on the bottom of each connecting block, and the bearing springs are fixed on the top of the fixing frame on the bearing frame; A vibration part is connected to one of the outer walls of the sub-sieve shell, and the vibration part includes a transmission shaft. The transmission shaft passes through two symmetrically arranged side walls of the sub-sieve shell, and eccentric blocks are fixed at both ends of the transmission shaft. One end of the transmission shaft is connected to a first driving source.

[0011] The first driven pulley may be further mounted on the carrier frame via a mounting frame with a bearing, which is not shown in the figure.

[0012] The first motor drives the transmission shaft with the eccentric block to rotate, thereby driving the entire sub-screen shell to vibrate, thereby realizing vibration screening of sand materials.

[0013] In the technical solution, both ends of the driving roller are fixedly connected to the supporting frame via a mounting frame with bearings, and a second driving source is fixed to the end of one of the driving rollers.

[0014] The second driving source drives the transmission roller connected thereto to rotate, thereby driving the sand combing part on the conveyor belt to move, and the sand combing part moves in a direction opposite to the moving direction of the sand material on a side close to the corresponding screen plate.

[0015] Specifically, the second driving source includes a second motor, which is fixed on a mounting frame at the end of the corresponding transmission roller, and a second driving pulley is fixed on the output end of the second motor. The second driving pulley is connected to the second driven pulley through a second transmission belt, and the second driven pulley is fixed on the end of the corresponding transmission roller.

[0016] The second motor drives the second driving pulley to rotate, the second driving pulley drives the second driven pulley to rotate through the second transmission belt, and the second driven pulley drives the transmission roller connected thereto to rotate.

[0017] In the technical solution, the combing part includes a long strip-shaped mounting strip, the surface of the mounting strip protrudes outward to form a flattened horizontal plate, thereby forming a "T"-shaped structure as a whole, and the mounting strip is fixed on the conveyor belt and distributed along the width direction of the conveyor belt; A plurality of sand combing blocks distributed at equal intervals are fixed on the surface of the flattening horizontal plate, and the bottoms of the sand combing blocks are in an arc-shaped structure.

[0018] When the flattening horizontal plate moves, it can flatten the sand on the corresponding screening plate, and the sand combing block can loosen the agglomerated sand to improve the screening efficiency and effect.

[0019] In the technical solution, a sand balance component is also included, and the sand balance component is arranged on the sand combing part. The sand balance component includes a plurality of trigger parts and a plurality of extension parts. The trigger part is arranged in front of the installation strip, and the front is in the opposite direction to the rolling direction of the sand material. The trigger part is transmission connected with the extension part arranged inside the sand combing block. The trigger part detects the amount of sand to drive the extension part to extend or retract. The size of the gap space between two adjacent sand combing blocks is adjusted by extending or retracting the extension part, thereby achieving the function of balancing and adjusting the amount of sand on the corresponding sub-screening plates.

[0020] By real-time detection of the amount of sand on the screen plate and dynamically adjusting the expansion or contraction of the extension part, the distribution of sand can be effectively and accurately controlled to ensure that the screen plate surface maintains an appropriate amount of sand distribution. This design can not only significantly improve the screening efficiency and effect, but also optimize the overall performance of the screening equipment.

[0021] In the technical solution, the trigger part includes a bearing plate, the bearing plate is fixed on the front outer wall of the flattened horizontal plate, a trigger plate is rotatably connected to the bottom side wall of the bearing plate, one end of the first transmission member is rotatably connected to the rear outer wall of the trigger plate, the other end of the first transmission member is rotatably connected to the first connecting rod, and the connection between the first transmission member and the first connecting rod can slide on the bottom side wall of the first connecting rod, and a second spring is provided at the connection between the trigger plate and the first transmission member, and the second spring is a coil spring; The first connecting rod is connected to the second connecting rod located in the inner cavity of the flattened horizontal plate through a bearing member, and a lever structure is formed between the first connecting rod, the second connecting rod and the bearing member, and the bearing member is a fulcrum, and the bearing member is arranged on the through groove of the side wall of the flattened horizontal plate; The bottom end of the second connecting rod is connected with an inclined trigger rod, and the trigger rod overlaps the extension portion.

[0022] The end of the trigger rod may preferably be a spherical structure, or directly fixedly connected to a sphere, and overlapped with the extension portion through the spherical structure or the connection sphere.

[0023] A soft protective cover is connected between the trigger plate and the flattened horizontal plate, and the protective cover is wrapped around the periphery of the trigger part or around the periphery of the entire cavity surrounded by the trigger plate and the flattened horizontal plate.

[0024] Specifically, a guide rail is fixed on the bottom side wall of the first connecting rod, a slider is slidably connected inside the guide rail, and the slider is rotatably connected to the end of the first transmission member.

[0025] After the first connecting rod is tilted, the sliding block on the end portion thereof slides on the guide rail.

[0026] Specifically, the bearing member includes a round shaft, both ends of which are fixed on the side walls of the through groove, a rotatable collar is sleeved on the surface of the round shaft, and the first connecting rod and the second connecting rod are respectively fixed on both sides of the collar.

[0027] In the technical solution, the extension part includes a transmission horizontal plate distributed along the length direction of the flattened horizontal plate, and a plurality of expansion groups are arranged at the bottom of the transmission horizontal plate, and the expansion groups correspond to the sand combing blocks one by one, and the expansion groups are arranged in the inner cavity of the corresponding sand combing blocks; The top of the transmission transverse plate overlaps with the trigger rod.

[0028] One trigger part controls the expansion groups inside at least two adjacently distributed sand combing blocks at the same time, so as to avoid excessive impact of the trigger part on the cost.

[0029] Preferably, the unfolding group includes a transmission vertical rod, which is fixed to the bottom of the transmission horizontal plate, and the bottom end of the transmission vertical rod sequentially penetrates the side wall of the flattening horizontal plate and the side wall of the sand combing block and extends into the inner cavity of the sand combing block; A connecting plate is fixed to the bottom end of the transmission vertical rod, and second transmission members are rotatably connected to both sides of the connecting plate. The other ends of the two second transmission members are rotatably connected to the two fixed plates respectively, and the two second transmission members are arranged to be inclined outwards. An expansion plate is fixed to the fixed plate, and the expansion plate penetrates and is slidably connected to the side wall corresponding to the sand combing block, and the length directions of the expansion plate and the mounting strip plate are arranged parallel to each other. The first spring is sleeved on the transmission vertical rod, and the two ends of the first spring are respectively fixed on the transmission vertical rod and the inner wall of the flattening horizontal plate.

[0030] The transmission horizontal plate moves downward under the push of the trigger rod, and the downwardly moving horizontal plate pushes the transmission vertical rod connected thereto to move downward synchronously, and at this time, the first spring is deformed.

[0031] On the basis of being in accordance with the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present invention.

[0032] The positive and progressive effects of the present invention are: The uniform distribution of the sand material initially fed into the sand screening device through the material leveling component can significantly improve the screening efficiency and optimize the overall screening process. This design avoids the situation where too much sand material is fed into the screening device at one time during the feeding process, and reduces the accumulation and overloading of materials from the source. This not only ensures the uniform distribution of sand material on the screen surface, but also effectively prevents problems such as screen blockage and excessive load of the vibrating screen caused by excessive local sand material, thereby improving the thoroughness and accuracy of the initial screening.

[0033] In addition, the introduction of the material leveling component can also reduce equipment wear and extend the service life of the sand screening device. The evenly distributed sand reduces the local stress concentration of the screen and key parts of the equipment, avoiding component damage or performance degradation caused by uneven force. At the same time, the uniform feeding allows the screening vibration to act more fully on each part of the sand particles, improving the stability and efficiency of the screening process and creating more favorable conditions for subsequent screening operations.

[0034] More importantly, the material sizing component can also reduce energy consumption and operating costs. Avoiding repeated screening or rework after overfeeding makes the entire production process more efficient and continuous. For complex screening tasks that require sand materials of different particle sizes, the material sizing component can effectively reduce screening errors and ensure that the quality of the finished product meets standard requirements. In short, this design not only optimizes the screening process, but also has significant economic and long-term use value. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of the other side of the whole invention; Figure 3 It is a schematic diagram of the top view structure of the present invention; Figure 4 For the present invention Figure 3 A schematic diagram of a three-dimensional structure cut away at AA of FIG. Figure 5 For the present invention Figure 3 A schematic diagram of the planar structure cut at AA; Figure 6 This is a schematic diagram of the overall external structure of the sand combing part of the present invention; Figure 7 This is a schematic diagram of the external structure of the rear side of the sand combing part of the present invention; Figure 8 It is a schematic diagram of the side structure of the sand combing part of the present invention; Fig. 9 It is a schematic diagram of the top view of the sand combing part of the present invention; Fig.10 For the present invention Fig. 9 A schematic diagram of a three-dimensional structure cut away at CC of FIG. Fig.11 It is a schematic diagram of the structure of the trigger part and the extension part of the present invention; Fig.12 It is a schematic diagram of the top view of the trigger part and the extension part of the present invention; Fig.13 For the present invention Fig.12 A schematic diagram of a three-dimensional structure cut away at BB of FIG. Fig.14 For the present invention Fig.12 A schematic diagram of the planar structure cut away at BB; Fig.15 For the present invention Fig.13 A schematic diagram of a local enlarged structure at location I; Fig.16 It is a schematic diagram of the local structure of the trigger part of the present invention; In the figure, 1, a carrier frame; 11, a fixed frame; 12, a first motor; 13, a first driving pulley; 14, a first transmission belt; 15, a first driven pulley; 16, a transmission shaft; 17, an eccentric block; 18, a collecting hopper; 2. Load spring; 3. Screen shell; 31. Connecting block; 4. Screen plate; 5. material leveling assembly; 51. transmission roller; 52. conveyor belt; 53. second motor; 54. second driving pulley; 55. second driven pulley; 56. mounting frame; 6. Material separation shell; 61. Material discharge channel; 7. Combing sand part; 71. Installing strip board; 711. Through slot; 712. Flattening horizontal board; 72. Combing sand block; 8. trigger part; 81. bearing plate; 82. trigger plate; 83. first transmission member; 831. slider; 84. first connecting rod; 841. guide rail; 85. bearing member; 851. round shaft; 852. collar; 86. second connecting rod; 87. trigger rod; 88. protective cover; 9. Extension part; 91. Transmission horizontal plate; 92. Transmission vertical rod; 93. First spring; 94. Connecting plate; 95. Second transmission member; 96. Fixed plate; 97. Extension plate. DETAILED DESCRIPTION

[0036] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0037] like Figure 1 and Figure 2As shown, a sand screening device with a multi-stage screening function for construction includes a carrier frame 1, a sub-screen shell 3 is flexibly connected to the carrier frame 1, a plurality of sub-screen plates 4 distributed and superimposed in the vertical direction are fixed in the inner cavity of the sub-screen shell 3, and the sub-screen plates 4 are inclined, a plurality of evenly distributed sieve holes are opened on the sub-screen plates 4, and the sieve hole diameters of the sub-screen plates 4 decrease from top to bottom, and the sieve holes on the sub-screen plates 4 are not shown in the figure; A material leveling component 5 is provided for dynamically adjusting the thickness of the sand material on the corresponding sub-screen plate 4, wherein the material leveling component 5 is provided on the surface of the uppermost sub-screen plate 4, and the material leveling component 5 and the sub-screen plate 4 are provided in parallel with each other; The material leveling assembly 5 includes two driving rollers 51 and a conveyor belt 52 wrapped around the surfaces of the two driving rollers 51. The rectangular surface supported by the two driving rollers 51 is arranged parallel to the corresponding sub-screen plate 4. A plurality of equally spaced combing parts are fixed on the surface of the conveyor belt 52.

[0038] The material leveling component 5 can be used to level the sand material initially fed into the sand screening device, thereby avoiding the problem of incomplete initial screening caused by feeding too much sand at one time, thereby bringing adverse effects to subsequent screening. Embodiment 1

[0039] like Figure 4 and Figure 5 As shown, a material dividing shell 6 is provided at the lower side of the sub-screen plate 4, and the material dividing shell 6 is provided with material discharge channels 61 whose number is the same as the number of the sub-screen plates 4, and the material discharge channels 61 correspond to the sub-screen plates 4 one by one; A collecting hopper 18 is provided at the bottom of the sub-screening shell 3 , and the collecting hopper 18 is fixed on the supporting frame 1 .

[0040] The sand material screened by each sub-screening plate 4 flows out through the corresponding discharge channel 61 .

[0041] like Figure 1 As shown, two connecting blocks 31 are respectively fixed on the outer walls of both sides of the sub-screen housing 3, and a plurality of bearing springs 2 are fixed at the bottom of each connecting block 31, and the bearing springs 2 are fixed to the top of the fixing frame 11 on the bearing frame 1; A vibration part is connected to one of the outer walls of the sub-sieve shell 3, and the vibration part includes a transmission shaft 16. The transmission shaft 16 passes through two symmetrically arranged side walls of the sub-sieve shell 3, and eccentric blocks 17 are fixed at both ends of the transmission shaft 16. One end of the transmission shaft 16 is connected to a first driving source.

[0042] like Figure 2 As shown, the first driving source includes a first motor 12 , which is directly connected to the end of a transmission shaft 16 or connected to the transmission shaft 16 via a belt transmission portion, and the first motor 12 is fixed on the carrier 1 .

[0043] The belt transmission part includes a first driven pulley 15, which is fixed to the corresponding end of the transmission shaft 16. The first driven pulley 15 is connected to the first driving pulley 13 through a first transmission belt 14, and the first driving pulley 13 is fixed to the output end of the first motor 12.

[0044] The first driven pulley 15 can be further mounted on the carrier 1 via a mounting bracket 56 with a bearing, which is not shown in the figure.

[0045] The first electric drive drives the transmission shaft 16 with the eccentric block 17 to rotate, thereby driving the entire sub-screen shell 3 to vibrate, thereby achieving vibration screening of sand materials.

[0046] like Figure 2 and Figure 4 As shown, both ends of the driving roller 51 are fixedly connected to the supporting frame 1 through a mounting frame 56 with bearings, and a second driving source is fixed to the end of one of the driving rollers 51.

[0047] The second driving source drives the transmission roller 51 connected thereto to rotate, thereby driving the sand combing part on the conveyor belt 52 to move, and the sand combing part moves in the direction opposite to the moving direction of the sand material on the side close to the corresponding screen plate.

[0048] The second driving source includes a second motor 53, which is fixed on a mounting frame 56 at the end of the corresponding transmission roller 51. A second driving pulley 54 is fixed on the output end of the second motor 53. The second driving pulley 54 is connected to a second driven pulley 55 through a second transmission belt. The second driven pulley 55 is fixed on the end of the corresponding transmission roller 51.

[0049] The second motor 53 drives the second driving pulley 54 to rotate. The second driving pulley 54 drives the second driven pulley 55 to rotate through the second transmission belt. The second driven pulley 55 drives the transmission roller 51 connected thereto to rotate. Embodiment 2

[0050] like Figure 6-7 As shown, the combing part includes a long strip-shaped mounting strip 71, the surface of the mounting strip 71 protrudes outward to form a flattening horizontal plate 712, so as to form a "T"-shaped structure as a whole, and the mounting strip 71 is fixed on the conveyor belt 52 and distributed along the width direction of the conveyor belt 52; A plurality of sand combing blocks 72 distributed at equal intervals are fixed on the surface of the flattening horizontal plate 712 , and the bottom of the sand combing blocks 72 is an arc-shaped structure.

[0051] When the flattening horizontal plate 712 moves, it can flatten the sand material on the corresponding screening plate, and the sand combing block 72 can loosen the agglomerated sand material to improve the screening efficiency and effect. Embodiment 3

[0052] like Figure 8 and Fig.13 As shown, it also includes a sand balance component, which is arranged on the sand combing part. The sand balance component includes a plurality of trigger parts 8 and a plurality of extension parts 9. The trigger part 8 is arranged in front of the mounting strip 71, and the front is in the opposite direction to the rolling direction of the sand material. The trigger part 8 is transmission connected with the extension part 9 arranged inside the sand combing block 72. The trigger part 8 detects the amount of sand to drive the extension part 9 to extend or retract. The size of the gap space between two adjacent sand combing blocks 72 is adjusted by extending or retracting the extension part 9, thereby achieving the function of balancing and adjusting the amount of sand on the corresponding sub-screen plate 4.

[0053] In summary, when it is detected that there is too much sand in a local area of ​​the screen plate, the extension part 9 will be expanded in time to effectively control the flow speed of the sand and guide the excess sand to other screening areas, thereby preventing the excessive sand from directly entering the discharge channel 61 without being fully screened. This dynamic expansion function helps to improve the thoroughness of screening and reduce the problem of material rework or screening error caused by insufficient screening.

[0054] On the contrary, when it is detected that the sand material distribution on the screen plate is normal or there is too little sand material in a local area, the extension part 9 will shrink in time to make more space for the screening operation of the screen plate, thereby ensuring that the screen plate can efficiently perform the screening function. The shrinkage of the extension part 9 not only avoids interference with the normal screening process of the screen plate, but also further improves the accuracy and overall efficiency of screening.

[0055] The advantage of this design lies in its real-time and dynamic adjustment capabilities. Through the intelligent adjustment mechanism, it can not only evenly distribute the sand, but also adapt to the screening requirements under different feeding conditions. Regardless of the changes in the fluidity, particle size or water content of the sand, the adjustment function of the extension 9 can ensure the stability and efficiency of the screening process, avoiding the impact of uneven material distribution on the screening effect.

[0056] Specifically, Fig.11 As shown, the triggering part 8 includes a bearing plate 81, the bearing plate 81 is fixed on the front outer wall of the flattening horizontal plate 712, a triggering plate 82 is rotatably connected to the bottom side wall of the bearing plate 81, one end of a first transmission member 83 is rotatably connected to the rear outer wall of the triggering plate 82, the other end of the first transmission member 83 is rotatably connected to the first connecting rod 84, and the connection between the first transmission member 83 and the first connecting rod 84 can slide on the bottom side wall of the first connecting rod 84, and a second spring is provided at the connection between the triggering plate 82 and the first transmission member 83, and the second spring is a coil spring; The first connecting rod 84 is connected to the second connecting rod 86 located in the inner cavity of the flattening horizontal plate 712 through the bearing member 85, and a lever structure is formed between the first connecting rod 84, the second connecting rod 86 and the bearing member 85, and the bearing member 85 is a fulcrum. The bearing member 85 is arranged on the through groove 711 of the side wall of the flattening horizontal plate 712; The bottom end of the second connecting rod 86 is connected to a trigger rod 87 which is arranged obliquely, and the trigger rod 87 overlaps the extension portion 9 .

[0057] During the process of the trigger plate 82 moving above the corresponding sub-screen plate 4 along with the flattening cross plate 712, when too much sand is accumulated at the corresponding trigger plate 82, the trigger plate 82 is pushed and rotated by the reaction force of the accumulated sand. At this time, the second spring is deformed, and the trigger plate 82 drives the corresponding end of the first transmission member 83 to move during the process of rotating toward the rear side. The other end of the first transmission member 83 is tilted upward, thereby lifting the first connecting rod 84. The first connecting rod 84 drives the second connecting rod 86 to rotate on the circular shaft 851 through the ring 852. The end of the second connecting rod 86 rotates downward, and the trigger rod 87 on the end of the second connecting rod 86 pushes the extension part 9 downward.

[0058] The end of the trigger rod 87 may preferably be a spherical structure, or directly fixedly connected to a sphere, and overlapped with the extension portion 9 through the spherical structure or the connection sphere.

[0059] A soft protective cover 88 is connected between the trigger plate 82 and the flattened horizontal plate 712 . The protective cover 88 is wrapped around the periphery of the trigger portion 8 or around the periphery of the entire cavity enclosed between the trigger plate 82 and the flattened horizontal plate 712 .

[0060] Specifically, Fig.16 As shown, a guide rail 841 is fixed on the bottom side wall of the first connecting rod 84 , a slider 831 is slidably connected inside the guide rail 841 , and the slider 831 is rotatably connected to the end of the first transmission member 83 .

[0061] After the first connecting rod 84 is tilted, the slider 831 on the end thereof slides on the guide rail 841 .

[0062] Specifically, the bearing member 85 includes a round shaft 851 , both ends of which are fixed on the side walls of the through slot 711 , a rotatable ring 852 is sleeved on the surface of the round shaft 851 , and the first connecting rod 84 and the second connecting rod 86 are respectively fixed on both sides of the ring 852 .

[0063] Specifically, the extension portion 9 includes a transmission transverse plate 91 distributed along the length direction of the flattening transverse plate 712, and a plurality of expansion groups are arranged at the bottom of the transmission transverse plate 91. The expansion groups correspond to the sand combing blocks 72 one by one, and the expansion groups are arranged in the inner cavity of the corresponding sand combing blocks 72; The top of the transmission transverse plate 91 overlaps with the trigger rod 87 .

[0064] One triggering unit 8 controls the expansion groups inside at least two adjacently distributed combing blocks 72 at the same time, so as to avoid the triggering unit 8 affecting the cost too much.

[0065] Specifically, Figure 11-15 As shown, the unfolding group includes a transmission vertical rod 92, which is fixed to the bottom of the transmission horizontal plate 91, and the bottom end of the transmission vertical rod 92 sequentially penetrates the side wall of the flattening horizontal plate 712 and the side wall of the sand combing block 72 to extend into the inner cavity of the sand combing block 72; A connecting plate 94 is fixed to the bottom end of the transmission vertical rod 92, and second transmission members 95 are rotatably connected to both sides of the connecting plate 94. The other ends of the two second transmission members 95 are rotatably connected to two fixed plates 96 respectively, and the two second transmission members 95 are arranged to be inclined outwards. An expansion plate 97 is fixed to the fixed plate 96, and the expansion plate 97 penetrates and is slidably connected to the corresponding side wall of the sand combing block 72. The expansion plate 97 and the mounting strip plate 71 are arranged in parallel to each other in length direction. The first spring 93 is sleeved on the transmission vertical rod 92 . The two ends of the first spring 93 are respectively fixed on the transmission vertical rod 92 and the inner wall of the flattening horizontal plate 712 .

[0066] The transmission horizontal plate 91 moves downward under the push of the trigger rod 87 , and the downwardly moving horizontal plate pushes the transmission vertical rod 92 connected thereto to move downward synchronously, and at this time, the first spring 93 is deformed.

[0067] The downward movement of the transmission vertical rod 92 pushes the connecting plate 94 to move downward, and the downward movement of the connecting plate 94 pushes one end of the second transmission member 95 to move downward, thereby pushing the second transmission member 95 to move from an inclined rotation toward a horizontal state, thereby driving the two expansion plates 97 to move outward, causing the expansion part to slide out of the inner cavity of the sand combing block 72, reducing the space between the two adjacent sand combing blocks 72, so that the sand combing block 72 can also push the sand material upward to prevent the sand material that has not been fully screened from flowing out directly.

[0068] When the sand material in the corresponding area is normal or less, the first spring 93 and the second spring are in a normal state or are restored to a normal state by deformation, and the extension portion 9 is in a contracted state.

[0069] The elastic coefficients of the first spring 93 and the second spring determine the restoring capacity of the sand balance assembly and the range of detecting the sand amount. When the amount of sand to be screened is large, a spring with a larger elastic coefficient is selected, and when the amount of sand to be screened is small, a spring with a smaller elastic coefficient is selected.

[0070] The present invention is not limited to the above-mentioned embodiments. Any changes in shape or structure are within the protection scope of the present invention. The protection scope of the present invention is defined by the attached claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principle and essence of the present invention, but these changes and modifications are within the protection scope of the present invention.

Claims

1. A sand screening device with a multi-stage screening function for construction, comprising a support frame (1), a sub-screen shell (3) being flexibly connected to the support frame (1), a plurality of sub-screen plates (4) being fixed in an inner cavity of the sub-screen shell (3) and being distributed in a vertically stacked manner, and the sub-screen plates (4) being arranged obliquely, a plurality of evenly distributed sieve holes being opened on the sub-screen plates (4), and the sieve hole diameters of the sub-screen plates (4) decreasing from top to bottom, characterized in that: A material leveling component (5) for dynamically adjusting the thickness of the sand material on the corresponding sub-screen plate (4), wherein the material leveling component (5) is arranged on the surface of the uppermost sub-screen plate (4), and the material leveling component (5) and the sub-screen plate (4) are arranged parallel to each other; The material leveling assembly (5) comprises two driving rollers (51) and a conveyor belt (52) wrapped around the surfaces of the two driving rollers (51); a rectangular surface formed by the support of the two driving rollers (51) is arranged parallel to the corresponding sub-screening plate (4); and a plurality of equally spaced sand combing portions are fixed to the surface of the conveyor belt (52).

2. The sand screening device with multi-stage screening function for construction as claimed in claim 1, characterized in that: A material separation shell (6) is provided at a lower side of the sub-screen plate (4), and a number of material discharge channels (61) equal to the number of the sub-screen plates (4) is provided inside the material separation shell (6), and the material discharge channels (61) correspond to the sub-screen plates (4) in a one-to-one manner; A collecting hopper (18) is provided at the bottom of the sub-screening shell (3), and the collecting hopper (18) is fixed on the supporting frame (1).

3. The sand screening device with multi-stage screening function for construction as claimed in claim 1, characterized in that: Two connecting blocks (31) are respectively fixed on the outer walls of both sides of the sub-screen housing (3), and a plurality of bearing springs (2) are fixed on the bottom of each connecting block (31), and the bearing springs (2) are fixed to the top of a fixing frame (11) on the bearing frame (1); A vibrating portion is connected to one of the outer walls of the sub-sieve shell (3), the vibrating portion comprising a transmission shaft (16), the transmission shaft (16) passing through two symmetrically arranged side walls of the sub-sieve shell (3), and eccentric blocks (17) are fixed to both ends of the transmission shaft (16), and one end of the transmission shaft (16) is connected to a first driving source.

4. The sand screening device with multi-stage screening function for construction as claimed in claim 1, characterized in that: The combing section comprises a long strip-shaped mounting strip (71), the surface of the mounting strip (71) protruding outwards to form a flattening horizontal plate (712), thereby forming a "T"-shaped structure as a whole, and the mounting strip (71) is fixed on the conveyor belt (52) and distributed along the width direction of the conveyor belt (52); A plurality of sand combing blocks (72) distributed at equal intervals are fixed to the surface of the flattening horizontal plate (712), and the bottoms of the sand combing blocks (72) are in an arc-shaped structure.

5. The sand screening device with multi-stage screening function for construction as claimed in claim 4, characterized in that: It also includes a sand balance component, the sand balance component is arranged on the sand combing part, the sand balance component includes a plurality of trigger parts (8) and a plurality of extension parts (9), and the trigger part (8) is arranged in front of the installation strip (71); The trigger part (8) is in driving connection with an extension part (9) arranged inside the sand combing block (72); the trigger part (8) detects the amount of sand to drive the extension part (9) to extend or retract.

6. The sand screening device with multi-stage screening function for construction as claimed in claim 5, characterized in that: The trigger portion (8) comprises a bearing plate (81), the bearing plate (81) being fixed on the front outer wall of the flattened horizontal plate (712), a trigger plate (82) being rotatably connected to the bottom side wall of the bearing plate (81), one end of a first transmission member (83) being rotatably connected to the rear outer wall of the trigger plate (82), the other end of the first transmission member (83) being rotatably connected to a first connecting rod (84), and a connection between the first transmission member (83) and the first connecting rod (84) being able to slide on the bottom side wall of the first connecting rod (84), and a second spring being provided at a connection between the trigger plate (82) and the first transmission member (83); The first connecting rod (84) is connected to the second connecting rod (86) located in the inner cavity of the flattening horizontal plate (712) through the bearing member (85), and a lever structure is formed between the first connecting rod (84), the second connecting rod (86) and the bearing member (85), and the bearing member (85) is a fulcrum. The bearing member (85) is arranged on the through groove (711) of the side wall of the flattening horizontal plate (712); The bottom end of the second connecting rod (86) is connected to a trigger rod (87) which is arranged obliquely, and the trigger rod (87) overlaps the extension portion (9).

7. The sand screening device with multi-stage screening function for construction as claimed in claim 6, characterized in that: A guide rail (841) is fixed on the bottom side wall of the first connecting rod (84), a sliding block (831) is slidably connected inside the guide rail (841), and the sliding block (831) is rotatably connected to the end of the first transmission member (83).

8. The sand screening device with multi-stage screening function for construction as claimed in claim 6, characterized in that: The bearing member (85) comprises a round shaft (851), the two ends of which are fixed on the side walls of the through groove (711), a rotatable collar (852) is sleeved on the surface of the round shaft (851), and the first connecting rod (84) and the second connecting rod (86) are respectively fixed on the two sides of the collar (852).

9. The sand screening device with multi-stage screening function for construction as claimed in claim 6, characterized in that: The extension portion (9) comprises a transmission transverse plate (91) distributed along the length direction of the flattening transverse plate (712), and a plurality of expansion groups are arranged at the bottom of the transmission transverse plate (91), the expansion groups correspond to the sand combing blocks (72) one by one, and the expansion groups are arranged in the inner cavities of the corresponding sand combing blocks (72); The top of the transmission horizontal plate (91) overlaps the trigger rod (87).

10. The sand screening device with multi-stage screening function for construction as claimed in claim 9, characterized in that: The unfolding group comprises a transmission vertical rod (92), wherein the transmission vertical rod (92) is fixed to the bottom of the transmission horizontal plate (91), and the bottom end of the transmission vertical rod (92) sequentially penetrates the side wall of the flattening horizontal plate (712) and the side wall of the sand combing block (72) and extends into the inner cavity of the sand combing block (72); A connecting plate (94) is fixed to the bottom end of the transmission vertical rod (92), and second transmission members (95) are rotatably connected to both sides of the connecting plate (94). The other ends of the two second transmission members (95) are respectively rotatably connected to two fixed plates (96), and the two second transmission members (95) are arranged to be inclined outwards. An expansion plate (97) is fixed to the fixed plate (96), and the expansion plate (97) penetrates and is slidably connected to the corresponding side wall of the sand combing block (72); A first spring (93), the first spring (93) is sleeved on the transmission vertical rod (92), and two ends of the first spring (93) are respectively fixed on the transmission vertical rod (92) and the inner wall of the flattening horizontal plate (712).

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