Device for screening and weighing fine aggregates with different fineness moduli

Abstract

The utility model discloses a device for screening and weighing fine aggregate with different fineness moduli, which comprises a screening support and a screening component positioned above the screening support, and the screening component comprises a circular material receiving disc and a plurality of circular screening discs sequentially overlapped above the circular material receiving disc. The circular material receiving disc and all the circular screening discs are fixed together, a plurality of vibration springs which are fixed to the screening support and the circular material receiving disc and used for supporting the screening assembly are arranged between the screening support and the circular material receiving disc, and a vibration motor capable of adjusting the vibration frequency is installed at the bottom of the circular material receiving disc; the screening fineness modulus of the upper circular screening disc in every two adjacent circular screening discs is larger than that of the lower circular screening disc. The outer side wall of the circular receiving disc and the outer side wall of each circular screening disc are fixedly connected with discharging pipes which communicate with the interiors of the circular receiving discs and are used for discharging materials outwards. Material receiving devices which are used for receiving materials and have a weighing function are installed at the positions, corresponding to outlets of the discharging pipes, of the screening support.

Description

Technical Field

[0001] The utility model relates to the technical field of material screening, in particular to a device for screening and weighing fine aggregates with different fineness moduli. Background Art

[0002] With the continuous growth of construction demand in my country in recent years, the requirements for concrete are getting higher and higher. The key to ensuring the quality of concrete is to strictly control the composition and properties of various aggregates. Among them, fine aggregate is one of the main materials for concrete, and its technical properties affect the performance of concrete. Grading is a very important technical parameter of fine aggregate. Fine aggregate refers to natural sand and artificial sand with a particle size of less than 4.75mm, which is generally determined by screening tests. The screening test is to screen on a set of standard sieves, and calculate the mass of the sample retained on the sieve; then calculate according to the "percentage of the sieve residue" and "percentage of the sieve residue".

[0003] At present, screening tests in the industry are mostly conducted in a semi-manual manner. For example, manually place the stacked screening plates of different gradations on the positive screening machine, fix them manually, and start swinging. After the completion of the unit time, remove the screen plates of each layer and manually collect the fine aggregates of each layer of the screen plates, and then weigh and calculate. Each test operation takes a long time to install and disassemble each layer of the screen plates. In addition, many tests are purely manual screening with screen plates step by step. This method is prone to errors due to the inconsistency of manual operation, and manual screening also increases the workload of operators. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the utility model is: how to provide a device for screening and weighing fine aggregates of different fineness moduli, which is simple and convenient to operate and can screen, grade and weigh accurately and reliably.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A device for screening and weighing fine aggregates with different fineness moduli comprises a screening support and a screening assembly located above the screening support, the screening assembly comprising a circular receiving plate and a plurality of circular screening plates sequentially overlapped above the circular receiving plate, the circular receiving plate and all the circular screening plates are fixedly connected together, a plurality of vibration springs respectively fixedly connected thereto and used for supporting the screening assembly are arranged between the screening support and the circular receiving plate, a vibration motor capable of adjusting the vibration frequency is installed at the bottom of the circular receiving plate, the screening fineness modulus of the upper circular screening plate of two adjacent circular screening plates is greater than the screening fineness modulus of the lower circular screening plate, a discharge pipe connected to the interior of the circular receiving plate and used for discharging materials outward is fixedly connected to the outer side walls of the circular receiving plate and each circular screening plate, and a receiving device for receiving materials and having a weighing function is installed at the outlet position of each discharge pipe on the screening support respectively.

[0007] When the utility model is used for screening test, the fine aggregate is placed in the circular screening plate at the top, and the vibration motor is started to make the circular receiving plate and the circular screening plate vibrate with a certain frequency and amplitude. Through the vibration, the sand and gravel of different fineness modulus in the fine aggregate pass through different circular screening plates until the sand and gravel of the smallest fineness modulus grade falls into the circular receiving plate. During the vibration process, when the vibration frequency of the circular receiving plate and the circular screening plate is high and the amplitude is small, the centripetal force on the surface of the screen is large in the circular receiving plate and the circular screening plates of each layer. At this time, the sand and gravel materials will move toward the center along the surface of the screen. In this case, the kinetic energy of the sand and gravel materials is low, and they will gradually gather toward the center of the screen under the action of inertia. After the screening is completed, the vibration frequency of the vibration motor is adjusted. When the vibration frequency of the circular receiving plate and the circular screening plate is low and the amplitude is large, the centrifugal force on the surface of the screen is large. At this time, the sand and gravel materials will move toward the outer edge along the surface of the screen. In this case, the kinetic energy of the sand and gravel materials is high, and under the action of the centrifugal force, they will gradually move toward the outer edge of the screen; when the sand and gravel materials move to the edge of the circular receiving plate or the circular screening plate, because the edges of the circular receiving plate and the circular screening plate are arc-shaped structures, the sand and gravel materials will move along the edge, and finally be discharged through the corresponding discharge pipe, fall into the receiving device and complete the weighing, and finally the fineness modulus value can be calculated through the obtained weight data. In the utility model, the vibration frequency of the vibration motor is adjusted by changing the speed or other parameters of the vibration motor, and then the vibration frequency and amplitude of the circular receiving plate and the circular screening plate are changed, and then the motion trajectory of the sand and gravel materials can be changed, the centripetal motion or centrifugal motion of the sand and gravel materials can be realized, and the automatic operation of screening and weighing can be completed.

[0008] As an optimization, the side walls of the circular receiving plate and the circular screening plate are respectively provided with discharge ports for discharging the materials inside, and baffles are provided at the discharge ports to shield the discharge ports. The outer sides of the circular receiving plate and the circular screening plate and the positions corresponding to the discharge ports are respectively provided with opening and closing control devices fixedly connected to the baffles and capable of driving the baffles to control the opening and closing of the discharge ports, and the inlet of the discharge pipe is correspondingly arranged below the outer side of the discharge port. When vibrating the material, the baffle is used to shield the discharge port to prevent sand and gravel materials with different fineness moduli from being vibrated out of the discharge port, which affects the accuracy of the measurement.

[0009] As an optimization, the opening and closing control device is any one of a hydraulic cylinder, a pneumatic cylinder or an electric push rod, and the telescopic rod in the opening and closing control device is fixedly connected to the baffle, and the opening and closing of the baffle to the discharge port is controlled by the extension and retraction of the telescopic rod in the opening and closing control device.

[0010] As an optimization, the material receiving device includes a material cup, and the material receiving bracket is fixedly connected to the position corresponding to each material cup on the screening bracket, and the cup body of the material cup is connected to a flip support shaft, and a weighing sensor for weighing the material cup is installed on the flip support shaft, and the other end of the flip support shaft is rotatably connected to the material receiving bracket, and a flip motor for driving the flip support shaft to rotate around its center line direction and enabling the material cup to flip is installed on the material receiving bracket. When the flip motor controls the material cup to flip, the material cup can flip to a material receiving posture and a material pouring posture. When the material cup is in the material receiving posture, the cup mouth of the material cup corresponds to the outlet of the discharge pipe, and when the material cup is in the material pouring posture, the material in the material cup can be poured out from the cup mouth of the material cup by its own gravity. After the sand and gravel material is vibrated out from the corresponding discharge pipe, it enters the material cup in the material receiving posture, and the weight can be directly weighed by the weighing sensor. After that, it is only necessary to control the material cup to flip to the material pouring posture, and pour out the sand and gravel material in the material cup, so that the next screening test can be conveniently carried out.

[0011] As an optimization, the material receiving bracket is fixedly connected with a horizontally extending outward sliding rail, the outward sliding rail is extended in a direction away from the screening assembly, a movable slide is slidably connected to the outward sliding rail, and the material receiving bracket is fixedly connected with a sliding drive device capable of driving the movable slide to slide along the extension direction of the outward sliding rail, the flip support shaft and the flip motor are both installed on the corresponding movable slide, and when the movable slide moves in a direction away from the screening assembly, the material cup connected to the movable slide can be away from the screening assembly. Since the entire screening assembly will vibrate when the screening test is performed, a material cup that is too close is likely to collide with the screening assembly. If the length of the discharge pipe is simply extended, the discharge pipe is likely to interfere with the outside, and a safety accident is also likely to occur. Therefore, in the utility model, the position of the material cup is controlled by sliding, and when receiving the material, the material cup is moved close to the screening assembly for convenient material receiving, and when the screening assembly is working, the material cup is controlled to be away from the screening assembly to avoid collision.

[0012] As an optimization, the sliding drive device is any one of a hydraulic cylinder, a pneumatic cylinder or an electric push rod, and the telescopic rod in the sliding drive device is fixedly connected to the movable slide plate, and the reciprocating movement of the movable slide plate is controlled by the extension and retraction of the telescopic rod in the sliding drive device.

[0013] As an optimization, at least two of the material cups are located on the same side of the screening assembly and the flip support shafts thereon are connected to the same moving slide, and all the flip support shafts connected to the same moving slide are synchronously driven by the same flip motor using a transmission component. Controlling the flipping of multiple material cups by one flip motor can not only reduce costs, but also reduce the size and weight of the equipment.

[0014] As an optimization, a belt conveyor device installed on the screening bracket is also provided below the screening component. The screening bracket is fixedly connected with a downwardly inclined pouring trough corresponding to the position of each material cup. The pouring trough is connected to the material cup in a pouring posture so that the material poured out of the material cup can fall into the pouring trough. The outlet end of the pouring trough is correspondingly arranged above the feeding belt in the belt conveyor device. After all the material cups pour out the sand and gravel materials, the sand and gravel materials fall onto the feeding belt in the belt conveyor device through the pouring trough. Through the transmission of the feeding belt, a hopper can be set at the end to receive the materials, so as to facilitate the collection of the sand and gravel materials after the test.

[0015] As an optimization, the outer side walls of the circular receiving plate and the circular screening plate are respectively convexly formed with connecting rings arranged around the center line direction thereof, and multiple connecting rods are evenly spaced around the center line direction of the outer side of the screening assembly, and the connecting rods pass through all the connecting rings in the vertical direction. The connecting rods are located on the outer side of the two outermost connecting rings and are threaded with connecting nuts, which abut against the corresponding connecting rings to fasten the circular receiving plate and all the circular screening plates together. The connection structure is simple and reliable, and each circular screening plate can be replaced and maintained by simply removing the connecting nuts at the upper and lower ends.

[0016] As an optimization, a plurality of metal impact blocks are placed in the circular screening disc. During the vibration process, the metal impact blocks will also jump on the screen surface of the circular screening disc. During the jumping process of the metal impact blocks, the screen will be hit, causing the screen itself to vibrate. Through the vibration of the screen itself, the sand and gravel materials stuck in the screen can be shaken off, avoiding the sand and gravel materials being stuck in the screen and affecting the final weighing.

[0017] Compared with the prior art, the utility model has the following advantages: the utility model adjusts and controls the vibration frequency and amplitude of the screening component to achieve automatic control of screening and discharging, reduces the workload of operators, makes operation simpler and more convenient, and ensures accurate and reliable test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the utility model;

[0019] Figure 2 It is a structural schematic diagram of the screening component in the utility model;

[0020] Figure 3 This is a schematic diagram of the installation structure of the material cup of the utility model. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the embodiment of the utility model clearer, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. The components of the embodiment of the utility model generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiment of the utility model provided in the drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents the selected embodiment of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model.

[0022] It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In the description of the utility model, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the utility model product is usually placed when used, which is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In addition, the terms "horizontal", "vertical", etc. do not mean that the components are absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] like Figures 1 to 3 As shown, the device for screening and weighing fine aggregates with different fineness moduli in this specific embodiment comprises a screening support 1 and a screening assembly located above the screening support 1, the screening assembly comprising a circular receiving plate 2 and a plurality of circular screening plates 3 sequentially overlapped on the circular receiving plate 2, the circular receiving plate 2 and all the circular screening plates 3 are fixedly connected together, a plurality of vibration springs 4 respectively fixedly connected thereto and used for supporting the screening assembly are arranged between the screening support 1 and the circular receiving plate 2, a vibration motor capable of adjusting the vibration frequency is installed at the bottom of the circular receiving plate 2, the screening fineness modulus of the upper circular screening plate 3 of two adjacent circular screening plates 3 is greater than the screening fineness modulus of the lower circular screening plate 3, the outer side walls of the circular receiving plate 2 and each circular screening plate 3 are fixedly connected with a discharge pipe 5 connected with the interior thereof and used for discharging materials outward, and a receiving device for receiving materials and having a weighing function is installed at the outlet position of each discharge pipe 5 on the screening support 1.

[0024] In this specific embodiment, the side walls of the circular receiving plate 2 and the circular screening plate 3 are respectively provided with discharge ports for discharging the materials therein, and baffles 6 are provided at the discharge ports for shielding the discharge ports. An opening and closing control device 7 fixedly connected to the baffle 6 and capable of driving the baffle 6 to control the opening and closing of the discharge port is respectively provided on the outer sides of the circular receiving plate 2 and the circular screening plate 3 and at positions corresponding to the discharge ports, and the inlet of the discharge pipe 5 is correspondingly arranged at the lower outer side of the discharge port.

[0025] In this specific embodiment, the opening and closing control device 7 is a cylinder, and the telescopic rod in the opening and closing control device 7 is fixedly connected to the baffle 6. The opening and closing of the discharge port by the baffle 6 is controlled by the extension and retraction of the telescopic rod in the opening and closing control device 7.

[0026] In this specific embodiment, the material receiving device includes a material cup 8, and a material receiving bracket is fixedly connected to the position corresponding to each material cup 8 on the screening bracket 1. A flip support shaft is connected to the cup body of the material cup 8, and a weighing sensor for weighing the material cup 8 is installed on the flip support shaft. The other end of the flip support shaft is rotatably connected to the material receiving bracket, and a flip motor is installed on the material receiving bracket for driving the flip support shaft to rotate around its center line direction and enabling the material cup 8 to flip. When the flip motor controls the material cup 8 to flip, the material cup 8 can flip to a material receiving posture and a material pouring posture. When the material cup 8 is in the material receiving posture, the cup mouth of the material cup 8 corresponds to the outlet of the discharge pipe 5. When the material cup 8 is in the material pouring posture, the material in the material cup 8 can be poured out from the cup mouth of the material cup 8 by the action of its own gravity.

[0027] In this specific embodiment, a horizontally extending outward sliding rail 9 is fixedly connected to the material receiving bracket, and the outward sliding rail 9 is extended in a direction away from the screening component. A movable slide 10 is slidably connected to the outward sliding rail 9. A sliding driving device 11 is fixedly connected to the material receiving bracket and can drive the movable slide 10 to slide along the extension direction of the outward sliding rail 9. The flip support shaft and the flip motor are both installed on the corresponding movable slide 10. When the movable slide 10 moves in a direction away from the screening component, the material cup 8 connected to the movable slide 10 can move away from the screening component.

[0028] In this specific embodiment, the sliding drive device 11 is a cylinder, and the telescopic rod in the sliding drive device 11 is fixedly connected to the moving slide 10. The reciprocating movement of the moving slide 10 is controlled by the extension and retraction of the telescopic rod in the sliding drive device 11.

[0029] In this specific embodiment, at least two of the material cups 8 are located on the same side of the screening assembly and the flip support shafts thereon are connected to the same movable slide 10, and all the flip support shafts connected to the same movable slide 10 are synchronously connected via the same flip motor using transmission components.

[0030] In this specific embodiment, a belt conveyor 12 installed on the screening bracket 1 is also provided below the screening component, and a downwardly inclined pouring trough 13 is fixedly connected to the position of each material cup 8 on the screening bracket 1, and the pouring trough 13 is connected to the material cup 8 when it is in a pouring posture so that the material poured out of the material cup 8 can fall into the pouring trough 13, and the outlet end of the pouring trough 13 is correspondingly arranged above the feeding belt in the belt conveyor 12.

[0031] In this specific embodiment, the outer side walls of the circular receiving plate 2 and the circular screening plate 3 are respectively protruded with connecting rings 14 arranged around the center line direction thereof, and the outer side of the screening assembly is provided with a plurality of connecting rods 15 evenly spaced around the center line direction thereof, and the connecting rods 15 pass through all the connecting rings 14 in the vertical direction, and the connecting rods 15 are located on the outer side of the two outermost connecting rings 14 and are threadedly fitted with connecting nuts, which abut against the corresponding connecting rings 14 to fasten the circular receiving plate 2 and all the circular screening plates 3 together.

[0032] In this specific embodiment, a plurality of metal impact blocks are placed in the circular screening disc 3. The metal impact blocks may be spherical in structure, so that during the vibration process, the metal impact blocks with spherical structures can easily change their positions and bounce and impact the screen at different positions.

[0033] In addition, a shell can be arranged outside the device of the present application, and a loading port can be provided on the top of the shell to load the uppermost circular screening disc, and a feeding port can be provided on the side of the shell so that the feeding belt in the belt feeding device can extend out of the shell, so that the mechanical action execution part is inside the shell, which improves the safety of use. In addition, the control operation device of each control structure in the device of the present application can be installed on the shell for easy operation.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described by referring to the preferred embodiments of the utility model, those skilled in the art should understand that various changes can be made in form and details without departing from the spirit and scope of the utility model as defined in the appended claims.

Claims

1. A device for screening and weighing fine aggregates of different fineness moduli, characterized in that: The utility model comprises a screening support and a screening component located above the screening support, the screening component comprises a circular receiving plate and a plurality of circular screening plates overlapped in sequence above the circular receiving plate, the circular receiving plate and all the circular screening plates are fixedly connected together, a plurality of vibration springs respectively fixedly connected to the circular receiving plate and used to support the screening component are arranged between the screening support and the circular receiving plate, a vibration motor capable of adjusting the vibration frequency is installed at the bottom of the circular receiving plate, the screening fineness modulus of the upper circular screening plate of two adjacent circular screening plates is greater than the screening fineness modulus of the lower circular screening plate, the outer side walls of the circular receiving plate and each circular screening plate are fixedly connected with a discharge pipe connected with the interior thereof and used for discharging materials outward, and a receiving device for receiving materials and having a weighing function is installed at the outlet position of each discharge pipe on the screening support respectively.

2. The device for screening and weighing fine aggregates with different fineness moduli according to claim 1 is characterized in that: The circular receiving plate and the circular screening plate are respectively provided with discharge ports for discharging materials therein, and baffles for shielding the discharge ports are arranged at the discharge ports. Opening and closing control devices fixedly connected to the baffles and capable of driving the baffles to control the opening and closing of the discharge ports are respectively arranged on the outer sides of the circular receiving plate and the circular screening plate and at positions corresponding to the discharge ports, and the inlet of the discharge pipe is correspondingly arranged at the lower outer side of the discharge port.

3. The device for screening and weighing fine aggregates with different fineness moduli according to claim 2, characterized in that: The opening and closing control device is any one of a hydraulic cylinder, a pneumatic cylinder or an electric push rod. The telescopic rod in the opening and closing control device is fixedly connected to the baffle. The opening and closing of the discharge port by the baffle is controlled by the extension and retraction of the telescopic rod in the opening and closing control device.

4. The device for screening and weighing fine aggregates with different fineness moduli according to claim 1, characterized in that: The material receiving device includes a material cup, and a material receiving bracket is fixedly connected to the position of each material cup on the screening bracket, and a flip support shaft is connected to the cup body of the material cup, and a weighing sensor for weighing the material cup is installed on the flip support shaft, and the other end of the flip support shaft is rotatably connected to the material receiving bracket, and a flip motor is installed on the material receiving bracket for driving the flip support shaft to rotate around its center line direction and enabling the material cup to flip. When the flip motor controls the material cup to flip, the material cup can flip between a material receiving posture and a material pouring posture. When the material cup is in the material receiving posture, the cup mouth of the material cup corresponds to the outlet of the discharge pipe, and when the material cup is in the material pouring posture, the material in the material cup can be poured out from the cup mouth of the material cup by the action of its own gravity.

5. The device for screening and weighing fine aggregates with different fineness moduli according to claim 4, characterized in that: The material receiving bracket is fixedly connected with a horizontally extending outward sliding rail, which extends in a direction away from the screening assembly. A movable slide is slidably connected to the outward sliding rail. The material receiving bracket is fixedly connected with a sliding driving device that can drive the movable slide to slide along the extension direction of the outward sliding rail. The flip support shaft and the flip motor are both installed on the corresponding movable slide. When the movable slide moves in a direction away from the screening assembly, the material cup connected to the movable slide can move away from the screening assembly.

6. The device for screening and weighing fine aggregates with different fineness moduli according to claim 5, characterized in that: The sliding drive device is any one of a hydraulic cylinder, a pneumatic cylinder or an electric push rod. The telescopic rod in the sliding drive device is fixedly connected to the moving slide plate. The reciprocating movement of the moving slide plate is controlled by the telescopic rod in the sliding drive device.

7. The device for screening and weighing fine aggregates with different fineness moduli according to claim 5, characterized in that: At least two of the material cups are located on the same side of the screening assembly and the flip support shafts thereon are connected to the same moving slide, and all the flip support shafts connected to the same moving slide are synchronously connected through the same flip motor using a transmission component.

8. The device for screening and weighing fine aggregates with different fineness moduli according to claim 4, characterized in that: A belt conveyor device installed on the screening bracket is also provided below the screening component. A downwardly inclined pouring trough is fixedly connected to the position of each material cup on the screening bracket. The pouring trough is connected to the material cup when it is in a pouring posture so that the material poured out of the material cup can fall into the pouring trough. The outlet end of the pouring trough is correspondingly arranged above the feeding belt in the belt conveyor device.

9. The device for screening and weighing fine aggregates with different fineness moduli according to claim 1, characterized in that: The outer side walls of the circular receiving plate and the circular screening plate are respectively protruded with connecting rings arranged around the center line direction; the outer side of the screening assembly is provided with a plurality of connecting rods evenly spaced around the center line direction; the connecting rods pass through all the connecting rings in the vertical direction; the connecting rods are located on the outer side of the two outermost connecting rings and are threadedly fitted with connecting nuts; the connecting nuts abut against the corresponding connecting rings to fasten the circular receiving plate and all the circular screening plates together.

10. The device for screening and weighing fine aggregates with different fineness moduli according to claim 1, characterized in that: A plurality of metal impact blocks are placed in the circular screening plate.

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