Cement Negative Pressure Sieve Analyzer Laboratory

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Cement Negative Pressure Sieve Analyzer Laboratory

The utility model discloses a negative pressure screen analysis instrument for measuring cement fineness which is a new type. The negative pressure screen analysis instrument for measuring cement fineness is mainly characterized in that the air jet mouth of the negative pressure screen analysis instrument for measuring cement fineness is changed into a horn-shaped slit with unequal width from a slit with equal width; the length of the negative pressure screen analysis instrument for measuring cement fineness between the length of screen analysis instruments in West Germany and in China is of a super radius type; the size of a test screen, and the size of a screen seat are correspondingly adjusted. The new design improves the distribution of the air output quantity of the air jet mouth on a screen cloth, and dead angle is not easily formed, ensuring the accuracy of the test. The sizes of the test screen and the screen seat decrease; thus, the vacuum degree of the screen analysis system is improved, the screen analysis efficiency is improved, the test time is shortened, and the accuracy of the experiment results is further ensured.

Description

Negative pressure sieve analysis instrument for cement finenessA kind of cement properties check instrumentation is mainly used in the cement fineness check.What use the earliest in the world that screen analyzer checks cement fineness is the Germany, domestic in recent years also have a Counterfeit Item, screen analyzer used air nozzle in Germany is radius type (its length is similar to the radius of testing sieve), the air nozzle of domestic imitation product usefulness is diameter type (its length equals the diameter of testing sieve), more than the common feature of two kinds of screen analyzers be to adopt the air nozzle of wide opening and the testing sieve of φ 200mm; Its shortcoming is that the negative pressure of system reduces comparatively fast, and suction cleaner stops up easily; Add testing sieve bottom screen cloth and screen frame junction again, the steel endless belt is arranged, do not have sieve aperture is arranged, when making screen analysis test, some originally can be deposited in by the sample of sieve aperture on the sieve dead angle at the end, causes test error.Task of the present utility model is to improve the weak point of above negative pressure screen analyzer, makes its test findings more accurate, and keeps comparability with existing cement fineness test findings.Main feature of the present utility model is that the opening of screen analyzer air nozzle is not waited wide slot by waiting wide slot to change trumpet type into, its length is super radius type, between West Germany’s screen analyzer and homemade screen analyzer air nozzle opening length, it has improved the distribution of air-flow on screen cloth; Simultaneously, change the testing sieve of the φ 200mm that uses in the correlation technique testing sieve of φ 150mm in the GB1345 GB into, and cancellation sieve bottom margin portion non-mesh endless belt, change full mesh structure into, eliminated the dead angle problem of testing sieve; Sieve seat air intake opening diameter changes φ 25 ± 2mm into by original φ 40mm, and the new design of this kind can improve screen analysis system negative pressure value, has slowed down the obstruction of suction cleaner, thereby has guaranteed accuracy of experimental results.The utility model will be further described below in conjunction with Figure of description;Fig. 1 standard sieveFig. 2 sieves seatFig. 3 air nozzle and opening shape.

一、Uses

FYS150 Negative Pressure Sieve Analyzer is a special instrument for sieve analysis in accordance with the national standard GB1345-91 "Cement Fineness Inspection Method 80μm Sieve Analysis Method". It has a simple structure, intelligent processing and convenient operation, high precision and good repeatability. Features such as reduced energy consumption. It is an indispensable instrument for cement plants, construction companies, scientific research institutes and universities and colleges with cement majors.

二、technical parameter

1. Sieve analysis test fineness: 80μm

2. Screening and analysis automatic control time 2min (factory setting)

3. Adjustable range of working negative pressure: 0 to -10000pa

4. Measuring accuracy: ±100pa

5. Resolution: 10pa

6. Working environment: temperature 0~50°C humidity <85%RH

7. Nozzle speed: 30 ±2r /min

8. The distance between the nozzle opening and the screen: 2-8mm

9. Add cement sample: 25g

10. Power supply voltage: 220V±10%

11. Power consumption: 600W

12. Working noise ≤75dB

13. Net weight: 40kg

三、Structure principle

The negative pressure sieve analyzer is mainly composed of a box, a sieve base, a vacuum cleaner, a cyclone dust collection device and an intelligent digital display controller. The box is the main structure of the instrument. All parts and components are installed in the box. The sieve base is equipped with synchronous motors, nozzles, hard pipes, etc., and a test sieve and a sieve cover are placed on it. The lower end of the hard tube is connected with the air inlet of the cyclone with a hose, and a small port is connected to the negative pressure controller with a hose. The vacuum cleaner serves as the source of negative pressure. The suction port is connected to the air outlet of the cyclone, and the motor can be steplessly adjusted through the pressure adjusting knob on the panel, so as to change the working negative pressure of the instrument at any time. The cyclone dust collection device is composed of a cyclone tube and a dust collection bottle. The configuration of the cyclone greatly improves the dust collection efficiency, so that 95% of the cement dust falls into the dust collection bottle, thereby reducing the number of dust cleaning operations of the vacuum cleaner. The time is controlled by the program in the controller, so that the instrument can automatically stop after working for 2 minutes (factory setting). After the negative pressure sieve analyzer is started, the vacuum cleaner and the synchronous motor start to work, so that the inside of the sieve holder is kept under negative pressure. The fine cement powder to be tested on the test sieve becomes dynamic under the action of the airflow sprayed from the nozzle. The fine powder with a diameter smaller than the sieve aperture is sucked away through the test sieve under negative pressure suction, while the fine powder with a particle diameter larger than the sieve aperture remains on the test sieve, thus completing the sieving and meeting the requirements of GB1345-91 Test requirements.