Gravel screening device

Abstract

The invention provides a gravel screening device, and relates to the technical field of gravel screening, and the gravel screening device comprises a vehicle body, a screening net assembly, a sand separation assembly and a sand conveying plate. The screening net assembly comprises a first screening net, a second screening net and a third screening net, the mesh number of the first screening net is larger than that of the second screening net, and the mesh number of the second screening net is larger than that of the third screening net. The sand separating assembly comprises a sand separating plate and a collecting plate, and the sand separating plate is arranged below the first screen; the collecting plate comprises a first plate body, a second plate body and a sand discharging opening, the first plate body is arranged below the second screen, and the second plate body is arranged below the third screen. The sand conveying plate is installed above the screening net assembly and comprises a first end and a second end, and the extending direction of the sand conveying plate points to the middle of the first screening net. The gravel screening device can effectively meet screening requirements of underground pipeline backfilling in most tunnels, has high screening efficiency, and can reduce noise and energy consumption in the backfilling material screening process.

Description

Technical Field

[0001] The present application relates to the technical field of sand and gravel screening, and in particular to a sand and gravel screening device. Background Art

[0002] The gravel backfilling operation of underground pipelines is an important part of pipeline construction. Its purpose is to fix the position of the pipeline, prevent the pipeline from moving, protect the pipeline from external damage and facilitate drainage. Among them, as for the particle size of the backfill gravel, it is generally required that the backfill gravel has a good particle size distribution, that is, it is necessary to screen and remove gravel with too large and too small particle sizes, use gravel with coarser particle sizes as the support for backfilling, and fill gravel with finer particle sizes between gravel with coarser particle sizes to reduce the stress of gravel on the pipeline and facilitate drainage around the pipeline.

[0003] At present, when laying underground pipelines in tunnels, there are generally two ways to screen sand and gravel for backfilling underground pipelines. One is a powered sand and gravel screening machine, and the other is a manual sand and gravel screening device.

[0004] Among them, for the powered sand and gravel screening machine, it uses electric energy as the driving force to drive the corresponding screening device to screen the sand and gravel materials to remove the oversized and undersized particles. However, on the one hand, since the space of the tunnel for municipal construction is generally small, large screening machines cannot enter the tunnel to work. Often, after the screening operation is completed outside the tunnel, the screened sand and gravel are transported to the tunnel. As the underground pipelines in the tunnel are gradually laid, the transportation distance and transportation difficulty will gradually increase, and the backfill efficiency is difficult to guarantee. On the other hand, even a small screening machine that can enter the tunnel needs to be electrically connected to the external power supply through a cable. Not only does it have the difficulty of cable docking and construction safety caused by the gradual laying of underground pipelines in the tunnel, but it also has problems such as high energy consumption and strong noise.

[0005] For manual sand and gravel screening devices, based on factors such as the use environment and space limitations in the tunnel, an inclined vertical screening net (which generally includes a bracket, a screen installed on the bracket and tilted, and the sand and gravel are manually thrown onto the screen for screening) is generally used to screen sand and gravel in the tunnel. However, this inclined vertical screening net has the following problems: First, it is inconvenient to move. With the gradual laying of underground pipelines, it is often necessary to move the inclined vertical screening net. This inclined vertical screening net is relatively large and generally has a fixed structure (that is, the screen and the bracket are fixedly connected). It often requires multiple people to transport it, which is inconvenient to move. The second is the relatively low screening efficiency. Due to the requirements for the particle size of the backfill material (the sand and gravel with too small and too large particle sizes need to be screened out), two screening meshes with different screening particle sizes are often required to cooperate. That is, a screening mesh with a finer screening particle size is used to screen out the sand and gravel with too small particle sizes, and then a screening mesh with a coarser screening particle size is used to screen out the sand and gravel with too large particle sizes. The screening efficiency is very low. Summary of the invention

[0006] In order to solve at least some of the technical problems in the related art, the present application provides a sand and gravel screening device. The sand and gravel screening device of the present invention can not only effectively adapt to the screening needs of most of the sand and gravel backfilled in the underground pipeline in the tunnel, but also has a high screening efficiency and can reduce the noise and energy consumption in the screening process of the backfill material.

[0007] In order to achieve the above purpose, the technical solution adopted in this application is: A sand and gravel screening device, used for screening backfill sand and gravel around underground pipelines, comprising: Car body, A screening mesh assembly is installed on the vehicle body, and the screening mesh assembly includes a first screen, a second screen and a third screen which are arranged obliquely in the same direction and connected in sequence, and the mesh numbers of the first screen, the second screen and the third screen are gradually reduced; A sand separation assembly is installed on the vehicle body, and includes a sand separation plate and a V-shaped collecting plate, wherein the sand separation plate is arranged below the first screen and the top of the sand separation plate abuts against the connection position between the first screen and the second screen; the collecting plate includes a first plate body and a second plate body, and a sand discharge port arranged at the connection between the first plate body and the second plate body, wherein the first plate body and the second plate body are arranged below the second screen and the third screen respectively, and the first plate body is connected to the sand separation plate; A sand conveying plate is installed on the vehicle body. The sand conveying plate is installed above the screening mesh assembly. The sand conveying plate includes a first end close to the first screen and a second end away from the first screen. The first end is set to be lower than the second end. There is a first distance between the first end and the first screen and the extension direction of the sand conveying plate points to the middle of the first screen. In the vertical direction, the projections of the second screen and the third screen fall within the projection of the sand conveying plate.

[0008] Optionally, the vehicle body includes two side panels, four legs and two push rods, the two side panels are arranged opposite to each other, the screening net assembly, the sand separation assembly and the two ends of the sand conveying plate are respectively connected to the two side panels, and the four legs are respectively arranged under the two side panels; Wherein, movable wheels are respectively installed at the bottom of the two legs close to the first screen, the two push rods are respectively connected to the two side panels and the two push rods are respectively installed on the side of the two side panels away from the first screen.

[0009] Optionally, the supporting legs are arranged obliquely, and in the vertical downward direction, the relative distance between two supporting legs connected to the same side plate gradually increases.

[0010] Optionally, the vehicle body also includes a sand blocking plate, which is arranged in a vertical direction, and the two ends of the sand blocking plate are respectively connected to the two side plates, the top of the sand blocking plate is connected to the sand transport plate, and there is a second distance between the bottom of the sand blocking plate and the third screen.

[0011] Optionally, one end of the side plate away from the first screen is flush with the sand blocking plate, and one end of the side plate away from the first screen is flush with one end of the third screen away from the second screen.

[0012] Optionally, the inclination angle of the first sieve is greater than the inclination angle of the second sieve, and the inclination angle of the second sieve is greater than the inclination angle of the third sieve.

[0013] Optionally, the inclination angle θ1 of the first screen satisfies: 30°≤θ1≤60°; The inclination angle θ2 of the second screen satisfies: 15°≤θ2≤45°; The inclination angle θ3 of the third screen satisfies: 10°≤θ3≤20°.

[0014] Optionally, the sand and gravel screening device further comprises a collecting trough, the collecting trough comprising a bottom wall, a peripheral wall, a hand-held rod and a hanging ring, the peripheral wall is formed into a ring-shaped structure, the bottom wall and the peripheral wall are connected to each other to jointly enclose a containing cavity, one end of the hand-held rod is connected to the outer surface of the peripheral wall, and the other end of the hand-held rod is connected to the hanging ring; The vehicle body also includes a hanging rod, and the hanging ring is used for being sleeved on the hanging rod.

[0015] Optionally, the peripheral wall includes a body portion and a flow guide portion; The main body portion is formed into a U-shaped structure, and the main body portion includes a first side wall and a second side wall that are oppositely arranged, and a third side wall connected between the first side wall and the second side wall; The guide part includes a first guide plate, a second guide plate and a third guide plate, the first guide plate and the second guide plate are connected to each other to form a V-shaped structure, one end of the first guide plate away from the second guide plate is connected to the first side wall, one end of the second guide plate away from the first guide plate is connected to the second side wall, the third guide plate is formed into an isosceles triangle plate-shaped structure, the bottom edge of the third guide plate is connected to the bottom wall, two waist edges of the third guide plate are respectively connected to the first guide plate and the second guide plate, and the vertex of the third guide plate is located at the connection position of the first guide plate and the second guide plate and is flush with the first guide plate and the second guide plate; Wherein, the hand-held rod is connected to the third side wall.

[0016] Optionally, the sand and gravel screening device further comprises a sand scratching assembly, the sand scratching assembly comprises a sand scratching piece and two placing hooks, the two placing hooks are arranged on the vehicle body at intervals in the horizontal direction, the placing hook is formed into an L-shaped structure, the placing hook comprises a connecting section connected to the vehicle body and a limiting section extending in the vertical direction, one end of the limiting section is connected to the connecting section, and the other end of the limiting section extends vertically upward; The sanding piece comprises a holding rod and a sanding plate, and one end of the holding rod is vertically connected to the sanding plate.

[0017] Beneficial effects: 1. First, compared with large-scale dynamic sand and gravel screening machines, the sand and gravel screening device of the present invention has a smaller volume and can be directly set in the tunnel, which can make the transportation distance of sand and gravel very short and effectively ensure the backfill efficiency.

[0018] Second, compared with a small powered sand and gravel screening machine, the sand and gravel screening device of the present invention can be manually operated without the need for electrical connection to a power source outside the tunnel through cables, so there will be no difficulty in connecting cables and no construction safety issues caused by laying cables. At the same time, the sand and gravel screening device of the present invention does not need to utilize electric energy to drive the screening device, so there will be no problems of high energy consumption and high noise.

[0019] Third, compared with the existing manual sand and gravel screening device, the sand and gravel screening device of the present invention can be moved by a vehicle body, which is convenient for transportation and can be well adapted to the gradual laying and backfilling requirements of the pipeline, thereby ensuring the backfilling efficiency. At the same time, the sand and gravel screening device of the present invention can quickly and effectively screen and remove sand and gravel with too small and too large particle sizes through the screening net assembly, the sand separation assembly and the sand conveying plate. There is no need for the coordinated operation of screening nets with multiple screening particle sizes, which can effectively improve the screening efficiency, and thus can effectively improve the backfilling efficiency.

[0020] Fourth, the screening mesh assembly provided in the present invention includes a first screen, a second screen and a third screen which are inclined in the same direction and connected in sequence. It can not only effectively complete the screening and removal of sand and gravel with too small and too large particle sizes, but also can utilize the self-weight of the sand and gravel to a certain extent, and complete the screening process of the sand and gravel more conveniently and quickly. At the same time, the screening mesh assembly provided in this way makes full use of the vertical space, and can effectively reduce the volume of the entire sand and gravel screening device so as to be better adapted to the tunnel working environment.

[0021] Fifth, the mesh number of the first sieve set in the present invention is the largest, and accordingly, the corresponding screening particle size is also the smallest, which can effectively screen out and remove the part of the sand and gravel with too small particle size first. The mesh number of the second sieve is smaller than that of the first sieve and larger than that of the third sieve. In this way, the second sieve will first screen out the sand and gravel of the corresponding particle size, so that the sand and gravel corresponding to the screening particle size of the third sieve can be more easily moved to the third sieve through the second sieve under the action of gravity, which can effectively ensure the screening efficiency.

[0022] Sixth, the sand separation plate in the sand separation assembly provided in the present invention can effectively prevent the sand and gravel with too small particle size removed by the first screen from floating under the collecting plate (or sand discharge port) under the action of air, thereby effectively ensuring that the sand and gravel below the sand discharge port have a larger particle size, and thus effectively ensuring the screening effect. At the same time, the collecting plate in the sand separation assembly provided in the present invention can effectively collect the sand and gravel that have leaked through the second and third screens to the sand discharge port, making it easier to collect, thereby improving the screening efficiency to a certain extent.

[0023] Seventh, the sand conveying plate provided in the present invention can not only guide the sand and gravel to be screened to move to the first screen, but also shield the second screen and the third screen, thereby preventing the sand and gravel to be screened from falling directly on the second screen and the third screen during the manual scattering process, thereby effectively ensuring the screening effect.

[0024] 2. Other beneficial effects or advantages of the present application will be described in detail in conjunction with the specific structure in the specific implementation manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative labor. In addition, it should be understood that the proportional relationship of the various components in the drawings of this specification does not represent the proportional relationship in the actual material selection and design, which is only a schematic diagram of the structure or position, where: Figure 1 is a three-dimensional structural schematic diagram of a sand and gravel screening device provided by an exemplary embodiment of the present application from one perspective, wherein a collecting tank is also shown to be placed below the sand discharge port; Figure 2 is a schematic diagram of a three-dimensional structure of a sand and gravel screening device provided by an exemplary embodiment of the present application from another perspective, wherein a collecting tank is also shown to be placed below the sand discharge port; Figure 3 yes Figure 2 A schematic diagram of the enlarged local structure at point A in the middle; Figure 4 is a schematic diagram of a three-dimensional structure of a sand and gravel screening device provided by an exemplary embodiment of the present application, wherein a portion of the side panels are hidden to show the screening mesh assembly provided; Figure 5 is a schematic diagram of the three-dimensional structure of a sand separation assembly provided by an exemplary embodiment of the present application; Figure 6 is a schematic diagram of a three-dimensional structure of a collection tank provided by an exemplary embodiment of the present application from one perspective; Figure 7 It is a schematic diagram of the three-dimensional structure of a collection tank from another perspective provided by an exemplary embodiment of the present application.

[0026] Description of the reference numerals in the accompanying drawings: 100-sand and gravel screening device; 1-car body; 11-side plate; 12-leg; 121-moving wheel; 13-car push rod; 14-sand blocking plate; 15-hanging rod; 2-screening mesh assembly; 21-first screen; 22-second screen; 23-third screen; 3-sand separation assembly; 31-sand isolation plate; 32-collecting plate; 321-first plate body; 322-second plate body; 323-sand discharge port; 4-sand conveying plate; 41-first end; 42-second end; 5-collecting tank; 51 -bottom wall; 52-peripheral wall; 521-main body; 5211-first side wall; 5212-second side wall; 5213-third side wall; 522-guide part; 5221-first guide plate; 5222-second guide plate; 5223-third guide plate; 53-handling rod; 54-hanging ring; 55-accommodating chamber; 6-scratching assembly; 61-scratching piece; 611-holding rod; 612-scratching plate; 62-placing hook; 621-connecting section; 622-limiting section. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0029] In the description of this application, it should be noted that the terms used, such as "above" and "below", refer to the upper and lower parts of the sand and gravel screening device of this application when in use; the terms used, such as "first" and "second", are only used to distinguish expressions, rather than to indicate or imply that they have a difference in importance or order; the terms used, such as "inside" and "outside", refer to the inside and outside of a specific contour. The use of the above terms is only to facilitate a clear and simple description of the technical solution of this application, and cannot be understood as a limitation on this application.

[0030] In order to facilitate relevant technical personnel to have a clearer and more accurate understanding of the technical solution of the present invention, the technical problems existing in the existing related technologies are first described in more detail below.

[0031] First, when backfilling underground pipelines in tunnels, the backfill gravel can be from external sources or from tunnel excavation (for such gravel, it is generally necessary to go through inspection, processing and testing to ensure that the gravel produced by excavation meets the backfill material standards). Whether it is gravel from external sources or gravel produced by excavation, it is necessary to go through screening steps during backfilling to ensure that the gradation of the backfill gravel meets the backfill standards, that is, it is necessary to ensure that the particle size of the backfill gravel is neither too large nor too small.

[0032] At present, the methods for screening backfill sand and gravel generally include powered sand and gravel screening machines and manual sand and gravel screening devices.

[0033] As for the method of using a powered sand and gravel screening machine to screen sand and gravel, due to the relatively narrow space in the tunnel, a large powered sand and gravel screening machine cannot enter the tunnel to work. Generally, a large powered sand and gravel screening machine is set up outside the tunnel for sand and gravel screening, or a small powered sand and gravel screening machine is set up inside the tunnel for sand and gravel screening. However, this will bring the following problems: First, for large-scale powered sand and gravel screening machines, as underground pipelines are gradually laid, the distance between the backfill position and the sand and gravel screening machine will become farther, and the transportation distance of the backfill sand and gravel will also become longer. At the same time, since the transportation path is in the tunnel, there are inevitably transportation interference factors (for example, some construction machinery in the tunnel obstructs the transportation path, and the location of construction somewhere in the tunnel may cause the transportation path to be interrupted, etc.), which will lead to low backfill efficiency.

[0034] Second, for a small powered sand and gravel screening machine, it needs to be electrically connected to an external power source through cables. However, as underground pipelines are gradually laid, small powered screening machines will need to be moved to reduce the distance of sand and gravel transportation. In this way, the cables will also increase, which will bring about the problem of how to connect the new part of the cable with the original cable, as well as the problem of safety assurance at the connection point. Moreover, setting up a powered sand and gravel screening machine in a tunnel will also bring about a great noise problem (based on factors such as sound reflection, sound focusing, and low environmental noise in the tunnel, the noise problem of the powered sand and gravel screening machine when working in the tunnel is very serious), resulting in an extremely harsh construction environment. In addition, the power-type sand and gravel screening machine also consumes a lot of energy, which will make the construction cost relatively high to a certain extent.

[0035] As for the method of using manual sand and gravel screening devices to screen sand and gravel, currently, an inclined vertical screening net is generally used to screen sand and gravel in the tunnel. However, this method also has the following problems: First, the inclined vertical screening net generally includes a bracket and a screen installed on the bracket and tilted. A certain amount of sand and gravel is thrown onto the screen manually using tools such as shovels and spades for screening. It generally does not have space shrinkage characteristics such as foldability, nor does it have an auxiliary mobile structure. It often requires multiple people to cooperate and carry it together to move its position, which is very inconvenient.

[0036] Second, the screen of the inclined vertical screening net is fixedly installed on the bracket, and its screening particle size is unique and fixed. A single inclined vertical screening net cannot simultaneously remove sand and gravel with both small and large particle sizes. Two inclined vertical screening nets with two screening particle sizes are often used in combination, that is, first use an inclined vertical screening net with a finer screening particle size to screen out sand and gravel with small particle sizes, and then use another inclined vertical screening net with a coarser screening particle size to screen out sand and gravel with large particle sizes. The screening efficiency is very low.

[0037] In view of this, the present invention provides a new solution, which can be well adapted to the screening needs of sand and gravel backfill in underground pipelines in tunnels, and also has high screening efficiency and can effectively reduce noise and energy consumption during the screening process.

[0038] The technical solution of the present application is described in detail below with reference to the accompanying drawings.

[0039] Example 1 like Figures 1 to 7 As shown, this embodiment provides a sand and gravel screening device 100, which is used to screen backfill sand and gravel around underground pipelines, including a vehicle body 1, a screening mesh assembly 2, a sand separation assembly 3 and a sand conveying plate 4. The screening mesh assembly 2 is installed on the vehicle body 1, and the screening mesh assembly 2 includes a first screen 21, a second screen 22 and a third screen 23 which are arranged obliquely in the same direction and connected in sequence, and the mesh numbers of the first screen 21, the second screen 22 and the third screen 23 are gradually reduced.

[0040] The sand separation assembly 3 is installed on the vehicle body 1, and includes a sand separation plate 31 and a V-shaped collecting plate 32. The sand separation plate 31 is arranged below the first screen 21, and the top of the sand separation plate 31 abuts against the connection position between the first screen 21 and the second screen 22; the collecting plate 32 includes a first plate body 321 and a second plate body 322, and a sand discharge port 323 arranged at the connection between the first plate body 321 and the second plate body 322. The first plate body 321 and the second plate body are arranged below the second screen 22 and the third screen 23, respectively, and the first plate body 321 is connected to the sand separation plate 31; The sand conveying plate 4 is installed on the vehicle body 1, and the sand conveying plate 4 is installed above the screening mesh assembly 2. The sand conveying plate 4 includes a first end 41 close to the first screen 21 and a second end 42 away from the first screen 21. The first end 41 is set to be lower than the second end 42. There is a first spacing between the first end 41 and the first screen 21, and the extension direction of the sand conveying plate 4 points to the middle of the first screen 21. In the vertical direction, the projections of the second screen 22 and the third screen 23 fall within the projection of the sand conveying plate 4.

[0041] To facilitate understanding by relevant technical personnel, the working process / working principle of the above implementation method will be described below.

[0042] When it is necessary to screen the sand and gravel backfill material, the vehicle body 1 can be moved to a predetermined position first, and then the sand and gravel to be screened can be thrown onto the sand conveying plate 4 manually using tools such as a shovel or a spade. Since the first end 41 of the sand conveying plate 4 is lower than the second end 42, the sand and gravel on it will move along the sand conveying plate 4 to the first screen 21 under the action of gravity. Since the mesh number of the first screen 21 is the largest, the sand and gravel with a smaller particle size will pass through the first screen 21 and fall out. Since the first screen 21 is inclined, the remaining sand and gravel will fall along the The first screen 21 moves to the second screen 22, the mesh number of the second screen 22 is less than that of the first screen 21, and the sand and gravel of the corresponding particle size will pass through the second screen 22 and fall on the first plate 321, and finally gather at the sand discharge port 323 and fall out. Since the second screen 22 is also inclined, the remaining sand and gravel will move along the second screen 22 to the third screen 23, the mesh number of the third screen 23 is the smallest, and the sand and gravel of the corresponding particle size will pass through the third screen 23 and fall on the second plate 322, and finally gather at the sand discharge port 323 and fall out. The remaining sand and gravel of larger particle size will still remain on the third screen 23.

[0043] In this way, the sand and gravel with smaller particle sizes will be screened and removed by the first screen 21, and the sand and gravel with larger particle sizes will remain on the third screen 23, so that the sand and gravel falling from the sand discharge port 323 can meet the backfill requirements of the underground pipeline.

[0044] Through the above technical solution, First, compared with a large powered sand and gravel screening machine, the sand and gravel screening device 100 of the present invention has a smaller volume and can be directly set in the tunnel, which can make the transportation distance of sand and gravel very short and effectively ensure the backfill efficiency.

[0045] Second, compared with a small powered sand and gravel screening machine, the sand and gravel screening device 100 of the present invention can be manually operated without being electrically connected to a power source outside the tunnel through cables, so there will be no difficulty in connecting cables and no construction safety issues caused by laying cables. At the same time, the sand and gravel screening device 100 of the present invention does not need to use electric energy to drive the screening device, so there will be no problems of high energy consumption and high noise.

[0046] Third, compared with the existing manual sand and gravel screening device, the sand and gravel screening device 100 of the present invention can be moved by the vehicle body 1, which is convenient for transportation and can be well adapted to the gradual laying and backfilling requirements of the pipeline, thereby ensuring the backfilling efficiency. At the same time, the sand and gravel screening device 100 of the present invention can quickly and effectively screen and remove sand and gravel with too small and too large particle sizes through the screening net component 2, the sand separation component 3 and the sand conveying plate 4. There is no need for the coordinated operation of screening nets with multiple screening particle sizes, which can effectively improve the screening efficiency, and thus can effectively improve the backfilling efficiency.

[0047] Fourthly, the screening mesh assembly 2 provided in the present invention includes a first screen 21, a second screen 22 and a third screen 23 which are inclined in the same direction and connected in sequence. It can not only effectively complete the screening and removal of sand and gravel with too small and too large particle sizes, but also can utilize the self-weight of the sand and gravel to a certain extent, and complete the screening process of the sand and gravel more conveniently and quickly. At the same time, the screening mesh assembly 2 provided in this way makes full use of the vertical space, and can effectively reduce the volume of the entire sand and gravel screening device 100, so as to be better adapted to the tunnel working environment.

[0048] Fifth, the mesh number of the first sieve 21 set in the present invention is the largest, and accordingly, the corresponding screening particle size is also the smallest, which can effectively screen out and remove the part of the sand and gravel with too small particle size first (the sand and gravel with too small particle size tends to increase the friction between the sand and gravel. After screening and removing it, the remaining sand and gravel are more likely to move on the screening mesh assembly 2 under the action of their own gravity), and the mesh number of the second sieve 22 is smaller than the first sieve 21 and larger than the third sieve 23. In this way, the second sieve 22 will first screen out the sand and gravel of the corresponding particle size, so that the sand and gravel corresponding to the screening particle size of the third sieve 23 can more easily move to the third sieve 23 through the second sieve 22 under the action of gravity, which can effectively ensure the screening efficiency.

[0049] In addition, it can be understood that the mesh sizes of the first sieve 21, the second sieve 22 and the third sieve 23 can be adjusted and selected according to actual conditions, and the present invention does not make any specific limitation on this.

[0050] Sixth, the sand separation plate 31 in the sand separation component 3 provided in the present invention can effectively prevent the sand and gravel with too small particle size removed by the first screen 21 from floating under the collecting plate 32 (or the sand discharge port 323) under the action of air, so as to effectively ensure that the sand and gravel below the sand discharge port 323 have a larger particle size, and thus effectively ensure the screening effect. At the same time, the collecting plate 32 in the sand separation component 3 provided in the present invention can effectively collect the sand and gravel that have leaked through the second screen 22 and the third screen 23 to the sand discharge port 323, which is more convenient for collection, and thus can improve the screening efficiency to a certain extent.

[0051] Seventh, the sand conveying plate 4 provided in the present invention can not only guide the sand and gravel to be screened to move to the first screen 21, but also shield the second screen 22 and the third screen 23, thereby preventing the sand and gravel to be screened from falling directly on the second screen 22 and the third screen 23 during the manual scattering process, thereby effectively ensuring the screening effect.

[0052] In addition, it can be understood that the first distance between the first end 41 of the sand conveying plate 4 and the first screen 21 can be selected and adjusted according to actual conditions, so as to ensure that the sand and gravel to be screened are guided to the middle of the first screen 21, and to ensure that the sand and gravel can move to the second screen 22 via the first screen 21.

[0053] In the above embodiment, it should be noted that the vehicle body 1 of the present invention can be any manual vehicle body 1 in the existing related technology, so that the operator can move the entire sand and gravel screening device 100 with the help of the vehicle body 1, and the present invention does not make specific limitations on this.

[0054] In one embodiment of the present invention, Figure 1 , Figure 2 and Figure 4 As shown, the vehicle body 1 of the present invention may include two side panels 11, four legs 12 and two push rods 13, the two side panels 11 are arranged opposite to each other, the two ends of the screening mesh assembly 2, the sand separation assembly 3 and the sand conveying plate 4 are respectively connected to the two side panels 11, and the four legs 12 are respectively arranged under the two side panels 11; wherein, moving wheels 121 are respectively installed at the bottom of the two legs 12 close to the first screen 21, and the two push rods 13 are respectively connected to the two side panels 11 and the two push rods 13 are respectively installed on the side of the two side panels 11 away from the first screen 21.

[0055] Thus, on one hand, the vehicle body 1 thus configured has the characteristics of simple structure and light weight, is easier to manufacture, has lower manufacturing cost, and is convenient for transportation. On the other hand, the vehicle body 1 thus configured can be moved by the two movable wheels 121 provided, and can be stably placed by the four legs 12 provided, which not only has the characteristics of convenient movement, but also has good stability during screening operations.

[0056] It is understandable that when screening operations are required, all four legs 12 can be placed on the ground to achieve stable placement of the vehicle body 1. When movement is required, the two legs 12 without the moving wheels 121 can be lifted by the push rod 13, so that the two legs 12 with the moving wheels 121 can be used to move.

[0057] In one embodiment of the present invention, Figure 1 , Figure 2 and Figure 4 As shown, the supporting legs 12 of the present invention can be arranged obliquely, and in the vertical downward direction, the relative distance between the two supporting legs 12 connected to the same side plate 11 gradually increases.

[0058] In this way, the four legs 12 arranged in this way can still have better load-bearing performance when two of the legs 12 are equipped with moving wheels 121. The supporting force directions of the four legs 12 can all point to the middle of the entire sand and gravel screening device 100. Even if the vehicle body 1 vibrates (vibrates) slightly during the screening process, the stability of the entire vehicle body 1 can be effectively guaranteed.

[0059] Since there is a certain height difference between the second end 42 of the sand conveying plate 4 and the third screen 23, when the sand and gravel are manually scattered, part of the sand and gravel may still fall directly on the third screen 23, resulting in poor screening effect of the sand and gravel.

[0060] In view of this, in one embodiment of the present invention, Figure 1 , Figure 2 and Figure 4 As shown, the vehicle body 1 of the present invention may further include a sand blocking plate 14, which is arranged in a vertical direction, and the two ends of the sand blocking plate 14 are respectively connected to the two side plates 11, the top of the sand blocking plate 14 is connected to the sand transport plate 4, and there is a second distance between the bottom of the sand blocking plate 14 and the third screen 23.

[0061] In this way, the sand blocking plate 14 thus arranged can effectively prevent the sand and gravel scattered manually from entering the lower part of the sand conveying plate 4, and can also effectively prevent the sand and gravel from falling directly on the third screen 23, so as to ensure the screening effect of the sand and gravel.

[0062] In this embodiment, it can be understood that the second spacing can be selected and adjusted according to actual needs, and the present invention does not specifically limit this.

[0063] Since the oversized sand and gravel after screening still remain on the third screen 23, it is necessary to clean it so as to facilitate the smooth progress of subsequent screening operations.

[0064] In view of this, in one embodiment of the present invention, Figure 1 , Figure 2 and Figure 4 As shown, one end of the side plate 11 away from the first screen 21 of the present invention is flush with the sand blocking plate 14 , and one end of the side plate 11 away from the first screen 21 is flush with one end of the third screen 23 away from the second screen 22 .

[0065] In this way, through the side plate 11 set in this way, the oversized sand and gravel after screening can fall directly from the inclined third screen 23 to the outside of the sand and gravel screening device 100 of the present invention under the action of its own gravity, and the remaining oversized sand and gravel can also be more conveniently removed manually by the operator, which is more conducive to the smooth progress of subsequent screening operations.

[0066] It can be understood that, in this embodiment, the sand and gravel falling off from the end of the third screen 23 away from the second screen 22 will not fall on the second plate 322, which can effectively prevent sand and gravel with too large particle size from falling under the sand discharge port 323, thereby effectively ensuring the effect of sand and gravel screening.

[0067] In one embodiment of the present invention, the inclination angle of the first screen 21 of the present invention may be greater than the inclination angle of the second screen 22 , and the inclination angle of the second screen 22 may be greater than the inclination angle of the third screen 23 .

[0068] In this way, firstly, the sand and gravel to be screened can more easily pass through the first screen 21, the second screen 22 and the third screen 23 in sequence under the action of its own gravity, thereby completing the screening process and ensuring the screening effect. Secondly, the inclination angles of the first screen 21, the second screen 22 and the third screen 23 are gradually reduced, which can more effectively make the sand and gravel stay on the screening mesh assembly 2 for a longer time, thereby ensuring the screening effect.

[0069] In one embodiment of the present invention, the inclination angle θ1 of the first screen 21 of the present invention satisfies: 30°≤θ1≤60°; the inclination angle θ2 of the second screen 22 satisfies: 15°≤θ2≤45°; the inclination angle θ3 of the third screen 23 satisfies: 10°≤θ3≤20°.

[0070] In one embodiment of the present invention, Figure 1 , Figure 2 , Figure 6 and Figure 7 As shown, the sand and gravel screening device 100 of the present invention can also include a collecting trough 5, which includes a bottom wall 51, a peripheral wall 52, a hand-held rod 53 and a hanging ring 54. The peripheral wall 52 is formed into an annular structure, and the bottom wall 51 and the peripheral wall 52 are connected to each other to jointly enclose a accommodating cavity 55. One end of the hand-held rod 53 is connected to the outer surface of the peripheral wall 52, and the other end of the hand-held rod 53 is connected to the hanging ring 54; the vehicle body 1 also includes a hanging rod 15, and the hanging ring 54 is used to be mounted on the hanging rod 15.

[0071] In this way, on the one hand, the collecting trough 5 can be directly placed under the sand discharge port 323 to collect the screened sand and gravel, and can directly transport the sand and gravel. On the other hand, the collecting trough 5 can be hung on the vehicle body 1 through the hook and the hanging ring 54, and move with the vehicle body 1, so as to facilitate the transport of the screened sand and gravel at any time.

[0072] In this embodiment, it can be understood that in order to ensure that the sand and gravel discharged from the sand discharge port 323 can be completely collected by the collecting trough 5, the radial size of the accommodating cavity 55 formed by the bottom wall 51 and the surrounding wall 52 can be greater than or equal to the radial size of the sand discharge port 323.

[0073] In one embodiment of the present invention, Figure 6 and Figure 7 As shown, the peripheral wall 52 of the present invention may include a body portion 521 and a guide portion 522; the body portion 521 is formed into a U-shaped structure, and the body portion 521 includes a first side wall 5211 and a second side wall 5212 that are arranged opposite to each other, and a third side wall 5213 connected between the first side wall 5211 and the second side wall 5212; the guide portion 522 includes a first guide plate 5221, a second guide plate 5222 and a third guide plate 5223, the first guide plate 5221 and the second guide plate 5222 are connected to each other to form a V-shaped structure, and one end of the first guide plate 5221 away from the second guide plate 5222 is connected to the third guide plate 5223. The first side wall 5211 is connected, the end of the second guide plate 5222 away from the first guide plate 5221 is connected to the second side wall 5212, the third guide plate 5223 is formed into an isosceles triangle plate structure, the bottom edge of the third guide plate 5223 is connected to the bottom wall 51, the two waist edges of the third guide plate 5223 are respectively connected to the first guide plate 5221 and the second guide plate 5222, the vertex of the third guide plate 5223 is located at the connection position of the first guide plate 5221 and the second guide plate 5222 and is flush with the first guide plate 5221 and the second guide plate 5222; wherein, the hand-held rod 53 is connected to the third side wall 5213.

[0074] Thus, on one hand, the main body 521 and the guide part 522 thus configured can stably accommodate the sand and gravel falling from the sand discharge port 323, so as to realize the transportation of the sand and gravel and facilitate backfilling. On the other hand, the guide part 522 thus configured can facilitate the operator to dump the sand and gravel, so that the sand and gravel can be dumped to the designated position under the action of the first guide plate 5221, the second guide plate 5222 and the third guide plate 5223.

[0075] It is understandable that in the above embodiment, during transportation, the operator can directly transport by holding the entire collection tank 5. During dumping, the operator can first place the diversion part 522 on the ground at the dumping position, and then use the hand-held rod 53 to tilt the entire collection tank 5, and the sand and gravel in the accommodating cavity 55 will fall out smoothly and accurately along the diversion part 522 for backfilling.

[0076] Since the surface of the sand and gravel itself is not smooth, there is friction between the sand and gravel, between the sand and gravel and the screening mesh assembly 2, and between the sand and gravel and the sand conveying plate 4. Some of the sand and gravel may stop at a certain position of the screening mesh assembly 2 or the sand conveying plate 4. The sand and gravel cannot move from the sand conveying plate 4 through the first screen 21 and the second screen 22 to the third screen 23 by its own weight, and the screening effect is poor.

[0077] In view of this, in one embodiment of the present invention, Figures 1 to 3 As shown, the sand and gravel screening device 100 of the present invention may also include a sand scratching component 6, which includes a sand scratching piece 61 and two placement hooks 62. The two placement hooks 62 are arranged on the vehicle body 1 at intervals in the horizontal direction, and the placement hooks 62 are formed into an L-shaped structure. The placement hook 62 includes a connecting section 621 connected to the vehicle body 1 and a limiting section 622 extending in the vertical direction. One end of the limiting section 622 is connected to the connecting section 621, and the other end of the limiting section 622 extends vertically upward; the sand scratching piece 61 includes a holding rod 611 and a sand scratching plate 612, and one end of the holding rod 611 is vertically connected to the sand scratching plate 612.

[0078] Thus, on one hand, through the sand-scratching piece 61 thus arranged, the operator can move the sand and gravel materials remaining on the sand conveying plate 4 or the screening mesh assembly 2 through the sand-scratching plate 612, so that the sand and gravel materials can smoothly move from the sand conveying plate 4 through the first screen 21 and the second screen 22 to the third screen 23, thereby quickly and smoothly screening the sand and gravel materials. On the other hand, through the placement hook 62 thus arranged, the sand-scratching piece 61 can be hung on the vehicle body 1, so as to move with the vehicle and facilitate transportation.

[0079] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A sand and gravel screening device, characterized in that: Backfill sand and gravel used for screening underground pipelines, including: Car body (1), A screening mesh assembly (2) is mounted on the vehicle body (1), the screening mesh assembly (2) comprising a first screening mesh (21), a second screening mesh (22) and a third screening mesh (23) which are arranged obliquely in the same direction and are connected in sequence, and the mesh sizes of the first screening mesh (21), the second screening mesh (22) and the third screening mesh (23) gradually decrease; A sand separation assembly (3) is mounted on the vehicle body (1), the sand separation assembly (3) comprising a sand separation plate (31) and a V-shaped collecting plate (32), the sand separation plate (31) being arranged below the first screen (21) and the top end of the sand separation plate (31) abutting against the connection position between the first screen (21) and the second screen (22); the collecting plate (32) comprising a first plate body (321) and a second plate body (322), and a sand discharge port (323) arranged at the connection between the first plate body (321) and the second plate body (322), the first plate body (321) and the second plate body (322) being arranged below the second screen (22) and the third screen (23) respectively, and the first plate body (321) being connected to the sand separation plate (31); A sand conveying plate (4) is mounted on the vehicle body (1). The sand conveying plate (4) is mounted above the screening mesh assembly (2). The sand conveying plate (4) comprises a first end (41) close to the first screening mesh (21) and a second end (42) away from the first screening mesh (21). The first end (41) is arranged to be lower than the second end (42). A first spacing exists between the first end (41) and the first screening mesh (21). The extension direction of the sand conveying plate (4) points to the middle of the first screening mesh (21). In the vertical direction, the projections of the second screening mesh (22) and the third screening mesh (23) fall within the projection of the sand conveying plate (4).

2. The sand and gravel screening device according to claim 1, characterized in that: The vehicle body (1) comprises two side panels (11), four legs (12) and two push rods (13); the two side panels (11) are arranged opposite to each other; the two ends of the screening net assembly (2), the sand separation assembly (3) and the sand conveying plate (4) are respectively connected to the two side panels (11); and the four legs (12) are respectively arranged below the two side panels (11); The bottoms of the two legs (12) close to the first screen (21) are respectively provided with moving wheels (121), the two push rods (13) are respectively connected to the two side panels (11), and the two push rods (13) are respectively installed on the side of the two side panels (11) away from the first screen (21).

3. The sand and gravel screening device according to claim 2, characterized in that: The supporting legs (12) are arranged obliquely, and in the vertical downward direction, the relative distance between two supporting legs (12) connected to the same side plate (11) gradually increases.

4. The sand and gravel screening device according to claim 2, characterized in that: The vehicle body (1) further comprises a sand blocking plate (14), the sand blocking plate (14) being arranged in a vertical direction, and the two ends of the sand blocking plate (14) being respectively connected to the two side plates (11), the top of the sand blocking plate (14) being connected to the sand transport plate (4), and a second spacing being present between the bottom of the sand blocking plate (14) and the third screen (23).

5. The sand and gravel screening device according to claim 4, characterized in that: One end of the side plate (11) away from the first screen (21) is flush with the sand blocking plate (14), and one end of the side plate (11) away from the first screen (21) is flush with one end of the third screen (23) away from the second screen (22).

6. The sand and gravel screening device according to claim 1, characterized in that: The inclination angle of the first screen (21) is greater than the inclination angle of the second screen (22), and the inclination angle of the second screen (22) is greater than the inclination angle of the third screen (23).

7. The sand and gravel screening device according to claim 6, characterized in that: The inclination angle θ1 of the first screen (21) satisfies: 30°≤θ1≤60°; The inclination angle θ2 of the second screen (22) satisfies: 15°≤θ2≤45°; The inclination angle θ3 of the third screen (23) satisfies: 10°≤θ3≤20°.

8. The sand and gravel screening device according to claim 1, characterized in that: The sand and gravel screening device further comprises a collecting trough (5), the collecting trough (5) comprising a bottom wall (51), a peripheral wall (52), a hand-held rod (53) and a hanging ring (54), the peripheral wall (52) being formed into a ring-shaped structure, the bottom wall (51) and the peripheral wall (52) being connected to each other to jointly enclose a containing cavity (55), one end of the hand-held rod (53) being connected to the outer surface of the peripheral wall (52), and the other end of the hand-held rod (53) being connected to the hanging ring (54); The vehicle body (1) further comprises a hanging rod (15), and the hanging ring (54) is used for being sleeved on the hanging rod (15).

9. The sand and gravel screening device according to claim 8, characterized in that: The peripheral wall (52) comprises a main body portion (521) and a flow guide portion (522); The main body portion (521) is formed into a U-shaped structure, and comprises a first side wall (5211) and a second side wall (5212) that are arranged opposite to each other, and a third side wall (5213) connected between the first side wall (5211) and the second side wall (5212); The guide portion (522) comprises a first guide plate (5221), a second guide plate (5222) and a third guide plate (5223); the first guide plate (5221) and the second guide plate (5222) are connected to each other to form a V-shaped structure; an end of the first guide plate (5221) away from the second guide plate (5222) is connected to the first side wall (5211); an end of the second guide plate (5222) away from the first guide plate (5221) is connected to the second side wall (5212); The third guide plate (5223) is formed into an isosceles triangle plate structure, the bottom edge of the third guide plate (5223) is connected to the bottom wall (51), the two waist edges of the third guide plate (5223) are respectively connected to the first guide plate (5221) and the second guide plate (5222), and the vertex of the third guide plate (5223) is located at the connection position of the first guide plate (5221) and the second guide plate (5222) and is flush with the first guide plate (5221) and the second guide plate (5222); Wherein, the hand-held rod (53) is connected to the third side wall (5213).

10. The sand and gravel screening device according to any one of claims 1 to 9, characterized in that: The sand and gravel screening device further comprises a sand scratching assembly (6), the sand scratching assembly (6) comprising a sand scratching piece (61) and two placement hooks (62), the two placement hooks (62) being arranged on the vehicle body (1) at intervals in the horizontal direction, the placement hooks (62) forming an L-shaped structure, the placement hooks (62) comprising a connecting section (621) connected to the vehicle body (1) and a limiting section (622) extending in the vertical direction, one end of the limiting section (622) being connected to the connecting section (621), and the other end of the limiting section (622) extending vertically upward; The sanding member (61) comprises a holding rod (611) and a sanding plate (612), and one end of the holding rod (611) is vertically connected to the sanding plate (612).

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