Automatic fine aggregate screening equipment

Abstract

The utility model discloses automatic fine aggregate screening equipment which comprises a screening assembly, a driving assembly, a weighing assembly and a controller, the screening assembly comprises a screen containing groove, a screen cover is arranged above the screen containing groove, a collecting funnel is connected below the screen containing groove, a collecting disc is arranged at the position, below the collecting funnel, of the screen containing groove, and a test screen can be placed in the screen containing groove; the driving assembly comprises a motor, an eccentric wheel is installed on an output shaft of the motor, an eccentric roller is arranged at the bottom of the screen containing groove, the side face of the screen containing groove is hinged to one end of a push rod, a spring is arranged on a rod body of the push rod and connected to a fixing piece, and the other end of the push rod penetrates and extends to the outer side of the fixing piece and is provided with a driven roller in rolling contact with the eccentric wheel; the weighing assembly comprises an electronic balance, a supporting frame is arranged on the electronic balance, and a collecting disc is placed on the supporting frame; the controller is connected with the motor to control start-stop and rotation speed of the motor. The fine aggregate screening device can replace a manual hand screen, and meanwhile dust diffusion during fine aggregate screening is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical screening test technical field, concretely relates to a kind of fine aggregate automatic screening equipment. BACKGROUND

[0002] With the sustained growth of infrastructure construction demand in China in recent years, the requirement of concrete is also higher and higher, and the key to ensure the quality of concrete is to strictly control the composition and property of various aggregates. Among them, fine aggregate is one of the main materials of concrete, and its technical property affects the performance of concrete. Gradation is a very important technical parameter of fine aggregate, which is generally determined by screening test. Fine aggregate screening is one of the common test operations of testing units and project engineering site laboratories. At present, for fine aggregate screening, the sleeve screen is placed on the shaking screen machine, and after shaking for 10 minutes, the sleeve screen is taken out, and then the hand screening is carried out one by one in order according to the size of the screen hole. The operation process needs to be repeated by the test personnel, which not only wastes time and effort, but also is low in efficiency. Moreover, dust diffusion is easy to occur in the process of fine aggregate screening, which is not conducive to the physical and mental health of the test personnel. SUMMARY

[0003] To solve the technical problems of time-consuming and labor-consuming and low efficiency of the existing fine aggregate screening, and dust diffusion in the process of fine aggregate screening, the utility model provides a kind of fine aggregate automatic screening equipment, which can replace manual screening and avoid dust diffusion during fine aggregate screening.

[0004] The utility model solves the technical problems by adopting the following technical scheme:

[0005] A kind of fine aggregate automatic screening equipment, comprising: screening assembly, drive assembly, weighing assembly and controller, screening assembly includes sieve groove, sieve groove is provided with sieve cover above, sieve groove is connected with collecting hopper below, sieve groove is provided with collecting disc below collecting hopper, sieve groove can be put into test sieve, and the aggregate with smaller particles is dropped into collecting disc through collecting hopper after passing through the screen of test sieve;

[0006] Drive assembly includes motor, the output shaft of motor is installed eccentric wheel, the bottom of sieve groove is equipped with eccentric roller, one end of push rod is hingedly connected to the side of sieve groove, spring is arranged on the rod of push rod and connected to a fixed part, the other end of push rod extends to the outside of fixed part, and passive roller that rolls and contacts eccentric wheel is arranged, passive roller is repeatedly slid forward under the combination of eccentric wheel and spring, and eccentric roller at the bottom of sieve groove rolls and drives sieve groove to bounce up and down;

[0007] Weighing assembly includes electronic balance, support frame is arranged on electronic balance, and collecting disc is placed on support frame;

[0008] The controller connects to the motor and controls its start, stop, and speed.

[0009] Furthermore, the inner wall of the sieve trough is provided with grooves to facilitate the insertion and removal of the test sieves.

[0010] Furthermore, the support frame, screening component, drive component, weighing component, and controller are all mounted on the support frame, with the weighing component positioned below the screening component and the controller positioned below the drive component and to one side of the weighing component.

[0011] Furthermore, the fastener is fixed to the support frame, which is equipped with a slide rail, and the eccentric roller rolls in the slide rail.

[0012] Furthermore, the support frame is provided with an outer shell, and a conformal opening is reserved on the top of the shell at the screen cover position. The side of the shell has a first opening for taking out and putting in the collection tray at the collection tray position. A transparent protective cover is installed at the first opening. The side of the shell has a second opening at the electronic balance and controller position where the control panel is exposed.

[0013] Furthermore, the electronic balance is adjusted to weigh the aggregate particles in the collection pan every minute after tare, and the weight of aggregate particles falling into the collection pan every minute is determined to be less than 0.1% of the total sample weight, thereby controlling the motor operation.

[0014] Furthermore, the controller is connected to an electronic balance, which can read the data from the electronic balance and control the motor to stop when the weight of the aggregate particles falling into the collection pan is less than a certain threshold within a certain period of time.

[0015] This utility model has the following beneficial effects:

[0016] This utility model provides an automatic fine aggregate screening device that can replace manual screening while avoiding dust diffusion during fine aggregate screening. It solves the problems of time-consuming, labor-intensive, and inefficient fine aggregate screening, as well as dust diffusion during the screening process. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the automatic fine aggregate screening equipment of this utility model;

[0018] Figure 2 This is a schematic diagram of the internal structure of the automatic fine aggregate screening equipment of this utility model;

[0019] Figure 3 This is an exploded view of the internal structure of the automatic fine aggregate screening equipment of this utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the automatic fine aggregate screening equipment with a screen trough in this utility model;

[0021] Figure 5 The utility model fine aggregate automatic screening equipment automatic screening control flow chart.

[0022] In the figure: 1, screening assembly;11, sieve groove;111, groove;12, sieve cover;13, collecting hopper;14, collecting disc;15, test sieve;16, eccentric roller;2, drive assembly;21, motor;22, eccentric wheel;23, push rod;24, spring;25, passive roller;3, weighing assembly;31, electronic balance;32, support frame;4, controller;5, support frame;51, fixing piece;52, slide rail;6, shell;7, transparent shield;8, control panel. DETAILED DESCRIPTION

[0023] In order to better understand the purpose, structure and function of the utility model, the utility model of a fine aggregate automatic screening equipment is further described in detail below in conjunction with the drawings.

[0024] As Figures 1-4 The utility model fine aggregate automatic screening equipment, including screening assembly 1, drive assembly 2, weighing assembly 3 and controller 4, screening assembly 1 includes sieve groove 11, sieve cover 12, collecting hopper 13 and collecting disc 14, test sieve 15 can be placed in sieve groove 11, and the fine aggregate with smaller particles is dropped into collecting disc 14 through collecting hopper 13 after passing through the test sieve 15 screen, and the inner side wall of sieve groove 11 is provided with groove 111 for facilitating the test sieve 15 to be put in and taken out, and the bottom is provided with eccentric roller 16.

[0025] Drive assembly 2 includes motor 21, eccentric wheel 22, push rod 23, spring 24 and passive roller 25, the output shaft of motor 21 is connected with eccentric wheel 22, spring 24 is sleeved on push rod 23, one end of push rod 23 is provided with passive roller 25, the other end of push rod 23 is hingedly connected with sieve groove 11, one end of spring 24 is connected with the hinged connection end of push rod 23, the other end is connected with a fixing piece 51, passive roller 25 is repeatedly slid forward under the combination of eccentric wheel 22 and spring 24, so that sieve groove 11 and test sieve 15 are shaken back and forth, and the eccentric roller 16 on the bottom of sieve groove 11 rolls, drives sieve groove 11 to jolt up and down, so that the screening effect is more obvious.

[0026] Weighing assembly 3 includes electronic balance 31 and support frame 32, support frame 32 is placed on electronic balance 31, and collecting disc 14 is placed on support frame 32.

[0027] The controller 4 is connected to the motor 21, and controls the start and stop and rotation speed of the motor 21.

[0028] In the embodiment, the support frame 5 is further included, the screening assembly 1, the driving assembly 2, the weighing assembly 3 and the controller 4 are all mounted on the support frame 5, wherein the weighing assembly 3 is arranged below the screening assembly 1, and the controller 4 is arranged below the driving assembly 2 and on one side of the weighing assembly 3.

[0029] The support frame 5 is provided with the housing 6 outside, the housing 6 is provided with a shaped opening above the sieve cover 12, the housing 6 is provided with a first opening on the side for taking and placing the collection tray 14 at the collection tray 14, the transparent cover 7 is mounted on the first opening in an openable and closable mode, and the housing 6 is provided with a second opening on the side at the electronic balance 31 and the controller 4 for leaking the control panel 8.

[0030] In the alternative embodiment, the controller 4 is connected to the electronic balance 31, the controller 4 can read the data of the electronic balance 31, and the motor 21 is stopped when the weight of the aggregate particles falling into the collection tray is less than a certain threshold value in a continuous time. Figure 5 As shown in the figure, the controller collects and records the data of the electronic balance 31 on the aggregate particles in the collection tray 14 once every 10s, judges whether the weight of the aggregate particles falling into the collection tray 14 is less than 0.1% of the total sample in 60s through calculation and processing, and thus automatically controls the motor 21 to continue screening or stop screening.

[0031] The device has the advantages of replacing manual screening and avoiding dust diffusion during fine aggregate screening, solves the problems of time-consuming and laborious and low efficiency of the existing fine aggregate screening, and dust diffusion in the process of fine aggregate screening.

[0032] The screening method of the fine aggregate automatic screening device provided in the embodiment adopts the screening device, and includes the following steps.

[0033] 1. Sampling according to the specification standard requirements, screening out particles larger than 9.50mm, calculating the percentage of the screening residue, and dividing the sample into about 1100g, placing it in an oven at 105±5℃, drying to constant weight, and then cooling to room temperature, and then averaging into two parts for standby.

[0034] 2, take 500g sample, accurate to 1g, pour the sample into the nest sieve with the bottom sieve, then sieve.

[0035] 3, the nest sieve is placed on the shaking sieve machine, and shakes for 10 minutes; the nest sieve is taken out, and is placed in the sieve groove 11 of the fine aggregate automatic screening device in sequence according to the size of the sieve hole, and the sieve cover 12 is covered, then the collection tray 14 is installed, and the transparent protective cover 7 is covered.

[0036] 4, start the switch of the device, and the automatic screening starts; when the screening amount per minute is less than 0.1% of the total amount of the sample, the device automatically stops screening, and an alarm is prompted; the test sieve 15 in the sieve groove 11 is taken out, and the residual aggregate in the sieve is weighed, accurate to 1g. Then the sample in the collection tray 14 is taken out and put into the next sieve, and the sample in the next sieve is put into the device for screening, and the process is sequentially repeated until all the sieves are screened.

[0037] 5, result calculation.

[0038] The residual rate of each sieve of the sample is calculated according to formula 1-1, accurate to 0.01%.

[0039] (1-1)

[0040] In the formula, Pi is the residual rate (%) of each sieve of the sample.

[0041] The residual rate Ai of each sieve of the sample is the sum of the residual rate of each sieve, accurate to 0.01%.

[0042] The fineness modulus of the sample is calculated according to formula 1-2, accurate to 0.01.

[0043] (1-2)

[0044] In the formula, Mx is the fineness modulus of the fine aggregate.

[0045] A0.15, A0.3, … A4.75 are the residual rates (%) of 0.15mm, 0.3mm, …, 4.75mm sieves respectively.

[0046] It can be understood that the utility model is described through some embodiments, and the person skilled in the art knows that various changes or equivalent replacements can be made to these features and embodiments without departing from the spirit and scope of the utility model. In addition, under the guidance of the utility model, these features and embodiments can be modified to adapt to specific conditions and materials without departing from the spirit and scope of the utility model. Therefore, the utility model is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the application belong to the scope protected by the utility model.

Claims

1. An automatic screening device for fine aggregates, characterized in that, The utility model relates to a kind of test sieve assembly, including: screening assembly (1), drive assembly (2), weighing assembly (3) and controller (4), screening assembly (1) includes sieve groove (11), sieve cover (12) is arranged above sieve groove (11), collecting hopper (13) is connected below sieve groove (11), sieve groove (11) is arranged collecting tray (14) below collecting hopper (13), sieve groove (11) can be placed test sieve (15), and the aggregate of smaller particle size is dropped into collecting tray (14) by collecting hopper (13) after passing through the screen of test sieve (15); Drive assembly (2) includes motor (21), and the output shaft of motor (21) is installed eccentric wheel (22), and eccentric roller (16) is arranged at the bottom of sieve groove (11), and one end of push rod (23) is hingedly connected to the side of sieve groove (11), and spring (24) is arranged on the rod of push rod (23) and is connected to a fixed part (51), and the other end of push rod (23) penetrates and extends to the outside of fixed part (51), and passive roller (25) that rolls and contacts eccentric wheel (22) is arranged, and passive roller (25) is repeatedly slid forward under the combination of eccentric wheel (22) and spring (24), and eccentric roller (16) at the bottom of sieve groove (11) rolls and drives sieve groove (11) to rock up and down; Weighing assembly (3) includes electronic balance (31), and support frame (32) is arranged on electronic balance (31), and collecting tray (14) is placed on support frame (32); Controller (4) is connected to motor (21) to control the start-stop and speed of motor (21). The inner side wall of sieve groove (11) is provided with a groove (111) for facilitating the insertion and removal of test sieve (15).

2. The fine aggregate autoscreening apparatus of claim 1, wherein, It includes support frame (5), and screening assembly (1), drive assembly (2), weighing assembly (3) and controller (4) are all installed on support frame (5), and weighing assembly (3) is arranged below screening assembly (1), and controller (4) is arranged below drive assembly (2) and on one side of weighing assembly (3).

3. The fine aggregate autoscreening apparatus of claim 1, wherein, Fixed part (51) is fixed on support frame (5), and slide rail (52) is arranged on support frame (5), and eccentric roller (16) rolls in slide rail (52).

4. The fine aggregate autoscreening apparatus of claim 3, wherein, Support frame (5) is provided with an outer shell (6), and a conformal opening is reserved above the outer shell (6) at the position of sieve cover (12), and a first opening is arranged on the side of outer shell (6) at collecting tray (14) for taking and placing collecting tray, and transparent protective cover (7) is installed at the first opening, and a second opening is arranged on the side of outer shell (6) at electronic balance (31) and controller (4) for leaking control panel (8).

5. The fine aggregate autoscreening apparatus of claim 3 or 4, wherein, ​

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