CN102091690B - Four-shaft forced synchronization variable linear uniform-thickness vibrating screen and screening method thereof - Google Patents

Abstract

A four-axis forced synchronous variable straight line equal thickness screening method and a vibrating screen are suitable for particle size classification and de-intermediation of raw coal, ore and other materials. It includes screen box, screen box support, spring, synchronous gear, vibration exciter. The vibrator includes a motor and a transmission shaft with an eccentric block. The transmission shaft is equipped with a gear and connected to the motor through a coupling. Among them, the two transmission shafts are arranged obliquely above the center of mass of the screen box, and the combined excitation force passes through the screen box. The center of mass; the other two drive shafts are located above the center of mass of the screen box, and the combined exciting force does not pass through the center of mass of the screen box. The stroke of the resulting variable linear trajectory gradually decreases from the feed end to the discharge end, which changes the motion pattern of the same track and intensity of each point on the screen surface of the traditional translational vibrating screen. The material movement speed at the feed end of the vibrating screen is fast, the material layer rapidly becomes thinner and stratified, and the material conveying speed at the discharge end slows down, the stratification is strengthened, and the chance of the material passing through the screen increases, showing the characteristics of equal thickness. The structure of the whole vibrating screen is simple, High screening efficiency.

Description

A four-axis forced synchronous variable linear equal-thickness vibrating screen and its screening method

Technical field:

The invention relates to a vibrating screen and its screening method, in particular to a four-axis forced synchronous variable linear equal-thickness vibrating screen used in mining, coal, smelting, building materials, refractory materials, light industry, chemical industry, medicine, food and other industries. Sieves and their sieving methods.

Background technique:

Among the linear vibrating screens proposed at home and abroad, they are generally biaxial, and the motion mode is mostly translational motion. The track-changing vibrating screens involved mainly include: CN01213819.3. This relates to a vibrating screen with variable ellipse and linear vibration. The vibrating screen is equipped with two motors and excitation shafts with eccentric masses. It mainly realizes variable ellipse and linear motion by changing the eccentric mass moment mr of each excitation shaft. However, in the actual installation process, the accuracy of the relative position of the center of force and the center of mass is very high, and it is easy to cause unstable motion; in addition, most of the currently proposed equal-thickness vibrating screens adopt the method of changing the inclination angle of the screen surface Equal-thickness screening is achieved, but the number of segments on the screen surface is limited, so there are defects such as sudden change in projection ability on the screen surface, discontinuity, and excessive vibrating screen volume, difficulty in manufacturing, and large floor space.

The linear vibrating screen is usually composed of a screen box, a base and a vibrator (or a vibrating motor). The vibrator includes a motor and a vibrating shaft with an eccentric block. Sieve for translation. When the center of gravity of the centrifugal inertial force coincides with the center of mass of the vibrating screen box, the whole vibrating screen box moves in translation, and the trajectory of each point on the screen box is the same as that of the center of mass. That is to say, the motion trajectory, conveying speed and throwing index of each point of the screen box are the same, the motion trajectory of the screen surface is single, and the motion mode of the screen surface is not ideal, so the screening efficiency is not high; although the structure of the double-axis vibrating screen is simple and easy to install, however However, it is limited by the size of the vibration intensity, which is not conducive to the development of large-scale and heavy-duty vibrating screens. The movement mode of the screen surface of the equal-pitch sieve can keep the material at the same thickness on the screen surface, and achieve an ideal screen surface movement mode, but the height of the equal-pitch sieve screen body is large, the floor space is relatively large, and the structure of the screen body is complicated, which is not easy Processing, the amount of maintenance at the time of use are large, too.

Invention content:

Technical problem: The object of the present invention is to overcome the deficiencies in the prior art, and provide a four-axis forced synchronous variable linear equal-thickness screening method and vibrating screen with simple structure, easy processing and good screening effect.

Technical solution: The four-axis forced synchronous linear constant thickness vibrating screen of the present invention includes a screen box composed of a sieve plate and a screen mesh, a support for supporting the screen box, a spring on the support, and a transmission on the sieve plate. Shaft, eccentric block, motor, and shaft coupling arranged on the transmission shaft. There are four transmission shafts. The structure of the eccentric block on the first transmission shaft is the same as that on the second transmission shaft. The third transmission shaft and the fourth transmission shaft have the same structure. The structure of the eccentric block on the shaft is the same; the four transmission shafts are respectively set above the overall center of mass of the screen box, the third transmission shaft and the fourth transmission shaft are arranged at intervals, the screen is arranged horizontally, and the line connecting the axis center and the warp axis The line of action between the midpoint and the center of mass is perpendicular, and the horizontal angle of the line of action is δ; the first transmission shaft and the second transmission shaft are arranged at intervals, corresponding to the third transmission shaft and the fourth transmission shaft, and the connecting line between the axis centers and The midpoint of the line connecting the axes is perpendicular to the line of action deviated from the center of mass, the horizontal angle of the line of action is β, the horizontal distance from the center of mass to the center of mass is L, and the second transmission shaft and the third transmission shaft are respectively equipped with mutual meshing Synchronous gears, four drive shafts are connected to three or four motors through couplings.

The horizontal angle δ is 5° to 45°; the horizontal angle β is 45° to 85°, and the horizontal distance L from the center of mass to the center of mass is 0.1 to 0.5m; the eccentric mass on the four transmission shafts The diameter products are all equal; the mass-diameter products of the eccentric blocks of the third transmission shaft and the fourth transmission shaft among the four transmission shafts are equal, and the mass-diameter products of the eccentric blocks of the first transmission shaft and the second transmission shaft are equal.

The four-axis forced synchronous variable straight line and equal thickness screening method of the present invention: when the mass-diameter products of the eccentric blocks on the four transmission shafts are equal, start three or four motors connected to the four transmission shafts, Under the action, the second transmission shaft and the third transmission shaft run in reverse synchronously, the third transmission shaft and the fourth transmission shaft run in reverse synchronously, and the action line of the combined exciting force passes through the center of mass. At the same time, the first transmission shaft and the second transmission shaft The transmission shaft runs synchronously and reversely, and the line of action of the synthetic exciting force deviates from the center of mass. At this time, the trajectory of the vibrating screen is a linear trajectory. The material is fed from the feeding end, and the material moves along the linear trajectory of the vibrating screen. While passing through the sieve continuously forward, it is distributed on the sieve surface with equal thickness, and gradually runs towards the discharge end.

Beneficial effects: (1) The equal-thickness screening of materials is realized through the zero-inclination screen surface, which changes the traditional form of equal-thickness screening by changing the inclination angle of the screen surface, and avoids the complexity of designing and manufacturing multi-inclination screen surfaces ; (2) Three or four motors and four transmission shafts are used, which can provide greater excitation strength and are suitable for vibrating screens with large screening areas; (3) The first transmission shaft and the second transmission shaft can be adjusted separately The eccentric mass-diameter product of the second transmission shaft can easily adjust the vibration direction angle and amplitude of the material movement on the vibrating screen box; the eccentric mass-diameter product of the third transmission shaft and the fourth transmission shaft can also be adjusted separately to adjust the vibration The vibration direction angle and amplitude of the material movement on the sieve box movement.

Description of drawings:

Fig. 1 is a schematic diagram of the front view of the four-axis forced synchronous variable linear equal-thickness vibrating screen of the present invention.

Fig. 2 is a top view structural schematic diagram of the four-axis forced synchronous variable-line equal-thickness vibrating screen of the present invention.

In the figure: 1, 2, 3, 4-transmission shaft, 5-screen plate, 6-support, 7-motor seat, 8-spring, 9-screen, 10-motor, 11-synchronous gear, 12-link Axis device.

Detailed ways:

The present invention will be further described below in conjunction with the embodiment in the accompanying drawings:

The four-axis forced synchronous variable linear constant thickness vibrating screen of the present invention is mainly composed of a screen box, a screen box bracket, a transmission shaft, a synchronous gear, and a vibrator. The sieve plate is composed of 5, the screen box support is mainly composed of a support 6 and a spring 8 which are arranged on the front and rear sides of the screen box to support the screen box, the spring 8 is set on the support 6, the screen 9 is set horizontally, and the upper part of the screen box is provided with a fixed Four transmission shafts on the sieve plate 5, the eccentric block, the motor 10, and the shaft coupling 12 have four transmission shafts, and the mass-diameter products of the eccentric block on the four transmission shafts are all equal; or the first in the four transmission shafts The mass-diameter products of the eccentric blocks of the third transmission shaft 3 and the fourth transmission shaft 4 are equal, and the mass-diameter products of the eccentric blocks of the first transmission shaft 1 and the second transmission shaft 2 are equal. The structure of the eccentric block on the first transmission shaft 1 and the second transmission shaft 2 is the same, the structure of the eccentric block on the third transmission shaft 3 and the fourth transmission shaft 4 is the same; the four transmission shafts are respectively arranged above the overall center of mass O of the screen box , the third and fourth transmission shafts are set obliquely above the centroid of the screen box, and their combined exciting force passes through the centroid O of the screen box; the first and second transmission shafts are set obliquely above the other side of the screen box's centroid, and their combined exciting force Through the centroid of the sieve box. The stroke of the resulting variable straight track gradually decreases from the feed end to the discharge end. The third transmission shaft 3 and the fourth transmission shaft 4 are arranged at intervals, and the axis connection line is perpendicular to the action line a between the midpoint of the axis connection line and the center of mass O, the horizontal angle of the action line a is δ, and the horizontal angle δ is 5°-45°; the horizontal angle β is 45°-85°, and the horizontal distance L between the centroid o ₁ and the centroid O is 0.1-0.5m. The first transmission shaft 1 and the second transmission shaft 2 are arranged at intervals, corresponding to the third transmission shaft 3 and the fourth transmission shaft 4, the midpoint of the connecting line between the axis centers and the axis center and the line of action deviated from the center of mass o ₁ b is perpendicular to each other, the horizontal angle of the line of action b is β, and the horizontal distance between the center of mass o ₁ and the center of mass O is L, and the second transmission shaft 2 and the third transmission shaft 3 are respectively provided with synchronous gears 11 meshing with each other. A transmission shaft is connected with three or four motors 10 through couplings 12.

The four-axis forced synchronous variable straight line and equal thickness screening method of the present invention: when the mass-diameter products of the eccentric blocks on the four transmission shafts are all equal, start three or four motors 10 connected to the four transmission shafts, and the synchronous gear Under the action of 11, the second transmission shaft 2 and the third transmission shaft 3 run synchronously and reversely, and the third transmission shaft 3 and the fourth transmission shaft 4 run synchronously and reversely, and the action line a of the synthetic exciting force passes through the center of mass O, and at the same time , the first transmission shaft 1 and the second transmission shaft 2 run synchronously and reversely, and the action line b of the combined exciting force passes through the deviation from the center of mass o ₁ . When the material is fed at the feeding end of the vibrating screen, the material quickly moves forward along the straight line of the vibrating screen surface and passes through the screen continuously. When the discharge end is running, the material conveying speed at the discharge end is slowed down, the layering is strengthened, and the chance of material passing through the sieve is increased.

Claims (2)

1. A four-axis forced synchronous variable linear equal-thickness vibrating screen, comprising a sieve box composed of a sieve plate (5) and a screen mesh (9), a support (6) for supporting the sieve box, and a support (6) on the support (6) The spring (8) on the top, the transmission shaft located on the sieve plate (5), the eccentric block located on the transmission shaft, the motor (10), and the shaft coupling (12), the transmission shafts are four, the first A drive shaft (1) has the same structure as the eccentric block on the second drive shaft (2), and the third drive shaft (3) has the same structure as the eccentric block on the fourth drive shaft (4); it is characterized in that: the screen ( 9) Horizontal setting, the four transmission shafts are set above the overall center of mass (O) of the screen box respectively, the third transmission shaft (3) and the fourth transmission shaft (4) are arranged at intervals, the third transmission shaft (3) and the fourth transmission shaft The axis connection line of power transmission shaft (4) is perpendicular to the first action line (a) of center point and center of mass (O) through the axis center connection line, and the horizontal included angle of the first action line (a) is δ; the first The transmission shaft (1) and the second transmission shaft (2) are arranged at intervals, corresponding to the third transmission shaft (3) and the fourth transmission shaft (4), and the first transmission shaft (1) and the second transmission shaft (2) The line connecting the axes is perpendicular to the midpoint _{of the axis line and the second line of action (b) that deviates from the center of mass (o 1 )} . ) and the center of mass (O) is L, the second transmission shaft (2) and the third transmission shaft (3) are respectively provided with synchronous gears (11) meshing with each other, and the four transmission shafts pass through couplings (12 ) is connected to three or four electric motors (10); The horizontal angle δ is 5°-45°; the horizontal angle β is 45°-85°, and the horizontal distance L between the centroid (o ₁ ) and the centroid (O) is 0.1-0.5m. 2. A four-axis forced synchronous variable linear equal-thickness screening method of a vibrating screen as claimed in claim 1, characterized in that: the screen cloth (9) is horizontally arranged, and the mass-diameter products of the eccentric blocks on the four drive shafts are all equal In this case, start three or four electric motors (10) connected to the four transmission shafts, and under the action of the synchronous gear (11), the second transmission shaft (2) and the third transmission shaft (3) run synchronously and reversely , the third transmission shaft (3) and the fourth transmission shaft (4) run synchronously and reversely, and the first action line (a) of the synthetic excitation force of the third transmission shaft (3) and the fourth transmission shaft (4) passes through the center of mass (O), at the same time, the first transmission shaft (1) and the second transmission shaft (2) run in reverse synchronously, and the first transmission shaft (1) and the second transmission shaft (2) synthesize the second line of action of the exciting force (b) By deviating from the center of mass (o ₁ ), at this time, the motion trajectory of the vibrating screen becomes a linear trajectory, and the material is fed from the feeding end, and the material moves forward along the linear trajectory of the vibrating screen. It is distributed on the sieve surface with equal thickness and gradually runs towards the discharge end.

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