CN108525997A - A kind of three shock electric machine elliptically vibrating screens of double tension spring couplings - Google Patents

Abstract

An elliptical vibrating screen with three excitation motors coupled with double tension springs is aimed at the complex structure and high installation accuracy of the coupling between the two excitation motors rotating in the same direction, which is not conducive to the development in the direction of large-scale and high efficiency. designed for the problem. The technical solution is: the axes of the three excitation motors are installed in parallel, the upper part (or lower part) of the eccentric block on one side of the two excitation motors rotating in the same direction is installed at the same radial position, and the tension spring is installed at the same radial position on the other side of the two excitation motors rotating in the same direction. The same tension spring is installed at the same radial position on the lower part (or upper part) of the side eccentric block, and the tension of the tension springs on both sides changes alternately to realize the approximate zero-phase synchronization under the synchronous state of the two excitation motors rotating in the same direction. The other vibration excitation motor and the two vibration excitation motors rotating in the same direction rotate in opposite directions at the same speed to realize the elliptical motion of the screen box. The invention can give full play to the exciting force of the three exciting motors, increase the amplitude of the system, improve the screening efficiency, and has simple structure, easy installation, low cost and energy saving.

Description

An elliptical vibrating screen with three excitation motors coupled with double tension springs

technical field

The invention relates to an elliptical vibrating screen with three excitation motors coupled with double tension springs, in particular to a heavy screen with a large screening area that is widely used in industries such as petroleum drilling, metallurgy, food, and mines and requires large excitation force.

Background technique

At present, vibrating screens are gradually developing in the direction of large-scale, high-strength, and large-processing capacity. However, due to site limitations, many researchers have proposed double-layer sieves and multi-layer sieves to increase the screening area. With the use of double-layer and multi-layer screens in the vibrating screen, the total mass of the system participating in the vibration increases, which further puts forward higher requirements for the excitation force of the system. In order to overcome the defect of insufficient excitation force of double-layer screen or multi-layer screen double-excitation motor, multi-excitation motor drive came into being. ZL201410160965.7 proposes a three-excitation motor self-synchronizing translational elliptical vibrating screen. Compared with a double-excitation motor-driven self-synchronization system, the three-excitation motor self-synchronization system, although the sum of the excitation force of the three excitation motors increases, but Due to the electromechanical coupling effect of the system, the two excitation motors rotating in the same direction will appear out of phase synchronization, and most of the excitation forces of the two will cancel each other out, so that the system cannot fully exert the excitation force of the three excitation motors. Chinese patent ZL201510227417.6 proposes to install a coupling unit on one side of the two excitation motors rotating in the same direction to achieve synchronization near zero phase. During the prototype experiment stage, it was found that the coupling unit has a great influence on the synchronization state of the system, and the processing and installation errors of the coupling unit may easily cause the system to freeze during the startup phase. CN201610728411.1 proposes an elliptical vibrating screen with three excitation motors coupled by torsion springs, which solves the coupling problem of two excitation motors installed on the coaxial line, but still cannot solve the problem of two coaxial vibrating screens with parallel axes but different axes. Problems existing in rotary excitation motors. In order to solve the above problems, an elliptical vibrating screen with three excitation motors based on double tension spring coupling is hereby proposed.

Contents of the invention

Aiming at the defects in the coupling of the above-mentioned three-excitation motor elliptical vibrating screen, the present invention proposes a three-excitation motor elliptical vibrating screen with simple structure and convenient installation with double tension spring coupling.

The present invention adopts the following technical solutions.

An elliptical vibrating screen with three excitation motors coupled with double extension springs, mainly composed of a screen box, a first excitation motor, a second excitation motor, a third excitation motor, extension springs, support springs, a base, a second excitation The eccentric block of the motor, the eccentric block of the third excitation motor, the spring fixed block, the pin sleeve, the pin, the fixed plate 1, the round rod, the fixed plate 2, the lock nut, the screw rod, the hook, the motor base and so on. Its structural feature is that the screen box is supported on the base by springs, the excitation motor is fixed on the side plate of the screen box through the motor base, the second excitation motor is installed parallel to the axis of the third excitation motor, and adopts the same eccentric mass moment Run in the same direction at the same speed. The first vibration motor is installed parallel to the axes of the second vibration motor and the third vibration motor, and its turning is opposite to that of the second vibration motor and the third vibration motor, and the rotating speed is the same. A tension spring is installed at the same radial position on the upper (or lower) part of the eccentric block on one side of the second vibration motor and the third vibration motor rotating in the same direction, and the second vibration motor and the third vibration motor on the other side The same extension spring is installed at the same radial position on the relative lower part (or upper part) of the eccentric block.

The connecting part of the extension spring and the eccentric block of the excitation motor is mainly composed of a spring fixing block, a pin sleeve, a pin, a fixing plate 1, a round rod, a fixing plate 2, a lock nut, a screw rod, a hook and the like. The pin sleeve is installed on the spring fixing block, and the pin sleeve of the spring fixing block is connected with the eccentric block through a pin, and can rotate around the pin. At the connecting portion between the extension spring and one end of the eccentric block of the excitation motor, a hook that can rotate relatively is installed on one side of the spring fixing block, and is connected with the extension spring. At the connecting part of the tension spring and the other end of the eccentric block of the excitation motor, a wire rod is welded on one side of the spring fixing block, and two smooth round rods are installed in the spring fixing block in parallel, and the two round rods can be used as relative to the spring fixing block. For relative sliding movement, the two ends of the round rod are welded with fixed plates parallel to each other. One of the fixed plates is connected with the tension spring, and the other fixed plate is installed on the spring fixed block with a screw rod. By adjusting the lock nuts on the front and rear of the fixed plate on the screw rod, the tension springs on both sides can maintain a certain pre-tightening force. . .

Before starting, due to the effect of gravity, the eccentric block is at the lowest position, at this time, the spring on one side is at the lowest position, and the tension spring on the other side is at the highest position. When the excitation motors start, due to the specificity difference of the excitation motors, the eccentric weights of the two excitation motors rotating in the same direction cannot be started synchronously at the same speed, resulting in a phase difference between the two excitation motors, resulting in a The tensile force of the extension spring increases, and the tension of the extension spring on the other side decreases, and the difference between the tension of the two springs is proportional to the phase difference between the two excitation motors. During the synchronization process, the tension of the tension springs on both sides changes alternately, and finally the tension states of the tension springs on both sides tend to be consistent, so that the phases of the two eccentric blocks tend to be 0°synchronous. When the system is in a steady state, the phase difference between the second vibration motor and the third vibration motor is stabilized at around 0° through the tension springs on both sides. In addition, when the three excitation motors run synchronously at the same speed, you can turn off the power supply of one of the two excitation motors rotating in the same direction, and only energize the other excitation motor, and the vibrating screen can still continue to work. Elliptical motion, and the vibration parameters are basically the same as the original system.

The advantages of the present invention are: (1) The two excitation motors rotating in the same direction can realize the approximate zero-phase synchronization in the steady state through the tension spring, which overcomes the defects in the coupling of the three-excitation motor elliptical vibrating screen. (2) This type of vibrating screen is suitable for multi-layer screens driven by multiple excitation motors with large processing capacity and large screening area, and has a good market application prospect. (3) This type of vibrating screen has simple structure, easy installation, easy maintenance and low cost.

Description of drawings

Fig. 1 is a schematic front view of the structure of an elliptical vibrating screen with three excitation motors coupled with double tension springs according to the present invention.

Fig. 2 is a schematic top view of the structure of an elliptical vibrating screen with three excitation motors coupled with double tension springs according to the present invention.

Fig. 3 is a schematic rear view of the structure of an elliptical vibrating screen with three excitation motors coupled with double tension springs according to the present invention.

Fig. 4 is a three-dimensional design diagram of an elliptical vibrating screen with three excitation motors coupled with double tension springs according to the present invention.

Fig. 5 is a schematic front view of the coupling structure of the second excitation motor and the third excitation motor of a three-excitation motor elliptical vibrating screen coupled with double tension springs according to the present invention.

Fig. 6 is a schematic rear view of the coupling structure of the second excitation motor and the third excitation motor of an elliptical vibrating screen with double tension spring coupling and three excitation motors according to the present invention.

Fig. 7 is a partially enlarged view of the connection between one end of the tension spring and the eccentric block of the excitation motor of an elliptical vibrating screen with three excitation motors coupled by double extension springs according to the present invention.

Fig. 8 is a partially enlarged view of the connection between the other end of the tension spring and the eccentric block of the excitation motor of an elliptical vibrating screen with double tension springs coupled with three excitation motors according to the present invention.

In the figure: 1. Screen box, 2. The first excitation motor, 3. The second excitation motor, 4. The third excitation motor, 5. Extension spring, 6. Support spring, 7. Base, 8. The second The eccentric block of the excitation motor, 9. the eccentric block of the third excitation motor, 10. the spring fixed block, 11. the pin sleeve, 12. the pin, 13. the fixed plate one, 14. the round rod, 15. the fixed plate two, 16. adjustable lock nut, 17. screw mandrel, 18. hook, 19. motor seat.

Detailed ways

Embodiments of the present invention will be specifically described below in conjunction with the accompanying drawings.

As shown in Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7 and Fig. 8, an elliptical vibrating screen with three excitation motors coupled with double tension springs is mainly composed of a screen box 1, a first Excitation motor 2, the second excitation motor 3, the third excitation motor 4, extension spring 5, support spring 6, base 7, the eccentric block 8 of the second excitation motor, the eccentric block 9 of the third excitation motor, Spring fixed block 10, pin sleeve 11, pin 12, fixed plate one 13, round bar 14, fixed plate two 15, locking nut 16, screw mandrel 17, hook 18, motor seat 19 etc. form. The screen box 1 is fixed on the base 7 through four supporting springs 6, and the axes of the three excitation motors are installed in parallel, wherein the second excitation motor 3 and the third vibration motor 4 are fixed on the side plate of the screen box through the motor base 19 Above, the eccentric mass 8 of the second excitation motor and the eccentric mass 9 of the third excitation motor are driven by the second excitation motor 3 and the third excitation motor 4 respectively. Install the coupling extension spring 5 at the same radial position on the lower part of the eccentric block 8 of the second excitation motor and the eccentric block 9 front side of the third excitation motor, as shown in Figure 5 . On the rear side, a coupling tension spring (5) is installed at the same radial position above the eccentric mass 8 of the second excitation motor and the eccentric mass 9 of the third excitation motor, as shown in FIG. 6 .

The connection part between the extension spring 5 and the eccentric blocks (8, 9) of the excitation motor, the pin sleeve 11 is installed on the spring fixing block 10, and the pin sleeve 11 of the spring fixing block is connected to the eccentric block (8, 9) through a pin 12 , and can rotate around the pin. At the connecting portion between the extension spring 5 and the eccentric block 9 of the third exciting motor, a relatively rotatable hook 18 is installed on one side of the spring fixing block 10, and is connected with the extension spring 5, as shown in FIG. 8 . At the connecting portion between the extension spring 5 and the eccentric block 8 of the second exciting motor, one side of the spring fixing block 10 is welded with a wire rod 17, and two smooth round rods 14 are installed in the spring fixing block 10 in parallel, and the two round rods It can do relative sliding movement relative to the spring fixed block, and the two ends of the round rod are welded to the fixed plates (13, 15) parallel to each other. Wherein fixed plate one 13 is connected with extension spring 5, and another fixed plate two 15 is installed on the screw mandrel 17, by adjusting the locking nut 16 on the screw mandrel, the lock nut 16 before and after the fixed plate, the extension spring 5 on both sides can be kept certain. Preload, as shown in Figure 7. After starting, the tensile force of the extension springs 5 on both sides changes alternately, and finally the tension states of the extension springs on both sides tend to be consistent, so that the phases of the two eccentric blocks tend to be 0° synchronous.

The second vibration-exciting motor (3) and the third vibration-exciting motor (4) use the same mass-diameter product and run in the same direction at the same speed, and the total force of the two is a circular vibration force. The rotation direction of the first vibration motor (2) is opposite to that of the second vibration motor (3) and the third vibration motor (4), and the rotation speed is the same, and the inertial force generated by it is the same as that of the second vibration motor (3) and the third vibration motor The resultant force of the inertial force generated by the exciting motor (4) makes the vibrating screen realize elliptical motion.

After the vibrating screen runs stably, you can turn off the power supply of one of the second vibration motor (3) and the third vibration motor (4), and continue to keep the first vibration motor (2) and the same rotation When one of the two excitation motors is powered on, the system can still continue to realize the elliptical motion. And the vibration parameters are basically the same as the original system.

Claims (4)

1. An elliptical vibrating screen with three excitation motors coupled with double extension springs, mainly composed of a screen box 1, a first excitation motor 2, a second excitation motor 3, a third excitation motor 4, extension springs 5, and support springs 6. Base 7, eccentric block 8 of the second exciting motor, 9 eccentric block of the third exciting motor, spring fixed block 10, pin sleeve 11, pin 12, fixed plate one 13, round rod 14, fixed plate two 15 , lock nut 16, screw rod 17, hook 18, motor base 19, etc.; it is characterized in that, the screen box 1 is fixed on the base 7 by four support springs 6, and the axes of the three excitation motors are installed in parallel, wherein the first Two excitation motors 3 and the third excitation motor 4 are fixed on the side plate of the screen box by a motor seat 19, and the second excitation motor eccentric block 8 and the third excitation motor eccentric block 9 are respectively formed by the second excitation motor 3 and the third excitation motor 4. The third excitation motor 4 drives; the same radial position is installed on the lower part of the eccentric block 8 of the second excitation motor and the lower part of the eccentric block 9 front side of the third excitation motor; at the rear side, the second excitation The same radial position of the eccentric block 8 of the motor and the eccentric block 9 top of the third excitation motor is equipped with a coupling extension spring 5 . 2. An elliptical vibrating screen with three excitation motors coupled with double extension springs according to claim (1), further characterized in that the connection between the extension spring 5 and the eccentric blocks (8, 9) of the excitation motor , the pin sleeve 11 is installed on the spring fixed block 10, the pin sleeve 11 of the spring fixed block is connected with the eccentric block (8, 9) through the pin 12, and can rotate around the pin; when the tension spring 5 and the third excitation At the connection part of the motor eccentric block 9, a hook 18 that can rotate relatively is installed on one side of the spring fixing block 10, and is connected with the extension spring 5; at the connection part of the extension spring 5 and the second excitation motor eccentric block 8, the spring One side of the fixed block 10 is welded with a wire rod 17, and two smooth round rods 14 are installed in the spring fixed block 10 in parallel, and the two round rods can slide relative to the spring fixed block, and the two ends of the round rods are welded with fixed plates parallel to each other (13,15), wherein the fixed plate one 13 is connected with the extension spring 5, and the other fixed plate two 15 is installed on the screw mandrel 17, by adjusting the locking nuts 16 on the screw mandrel, the front and back of the fixed plate, the two sides of the two sides can be Extension spring 5 maintains a certain preload. 3. An elliptical vibrating screen with three excitation motors coupled by double tension springs according to claim (1), characterized in that the second excitation motor 3 and the third excitation motor 4 use the same eccentric mass diameter and rotate in the same direction at the same speed, the total resultant force of the two is a circular vibration force; the first vibration motor 2 has the same speed as the second vibration motor 3 and the third vibration motor 4, and the direction of rotation is opposite. The resultant force of the generated inertial force and the inertial force generated by the second excitation motor 3 and the third excitation motor 4 makes the vibrating screen realize elliptical motion; when the three excitation motors are in a steady state with the same speed, the second excitation motor The motor 3 and the third excitation motor 4 realize approximately zero-phase synchronization under the action of the tension spring 5 . 4. An elliptical vibrating screen with three excitation motors coupled with double tension springs according to claim (1), further characterized in that after the vibrating screen runs stably, the second excitation motor (3) and the second excitation motor (3) can be turned off. The power supply of one of the three excitation motors (4) continues to keep the first excitation motor (2) energized with one of the two excitation motors rotating in the same direction, and the system can still continue to achieve elliptical motion at this time , and the vibration parameters are basically the same as those of the original system.