CN101972690A - Variable-rigidity double-mass vibration motor type super-huge vibration mill - Google Patents

Abstract

The present invention relates to a vibrating mill of variable stiffness two-mass vibrating motor type oversized vibrating mill, in particular a general vibrating mill or oversized vibrating mill with variable stiffness, two-mass and vibrating motor type; it includes an upper plastid , the lower body, the main vibration spring, the vibration isolation spring and the bottom plate, and the upper body includes the cylinder, the inlet, the end cover, the outlet, the vibration motor, the right coupling frame, the grinding medium, the left coupling frame and the counterweight The cylinder body is movably supported on the lower mass body through the main vibration spring, and the vibration motor is rigidly consolidated with the right coupling frame on the right side of the cylinder body, and the axis of the main vibration spring on the driving side is located at the gravitational axis of the cylinder body and the vibration motor Between; the lower body is supported on the base by a vibration-isolation spring, and a counterweight that is balanced with the quality on the right side is rigidly consolidated with the left coupling frame on the left side of the cylinder.

Description

Variable stiffness two-mass vibrating motor type super large vibrating mill

technical field

The present invention relates to a vibrating mill of variable stiffness two-mass vibrating motor type extra-large vibrating mill, in particular to a general vibrating mill or extra-large vibrating mill with variable stiffness, two-mass body and vibrating motor excitation form, which belongs to vibration utilization field of engineering technology.

Background technique

Vibrating mill is a vibrating mechanical equipment that uses the principle of vibration to complete material crushing operations. Ordinary vibrating mills are composed of one or more cylindrical or other shaped containers supported on springs. This container either rotates at the center of gravity or passes through multiple The vibrating motor tuned on the center of gravity performs an unbalanced motion similar to circular vibration, and the grinding medium (the material to be ground and the medium) installed in the mill container collides and rubs, and the crushing of the material is due to the interaction between the grinding medium itself And the result of the collision and friction between the grinding medium and the container wall. The grinding medium shapes the movement of the vibrating motor in the working direction, so that the crushing, flowing and conveying of materials can be carried out normally.

At present, vibrating mills at home and abroad, especially extra-large vibrating mills (cylinder diameter > 1.5m, volume > 10kL, installed power > 200kW), mostly use single-cylinder single-mass constant stiffness eccentric vibrating mills (Zhang Shili, extra-large vibrating mills and their applications , Metallurgical Industry Press, 2007), the principle will not be repeated, the eccentric vibratory mill can produce non-uniform vibration composed of circular, elliptical and linear vibrations, compared with the elliptical and linear vibrations that appear additionally in ordinary vibratory mills, It can increase the speed, impact force and friction of the grinding medium, and increase the crushing effect, but due to the complex impact, collision, friction, flow and other movements of the multi-phase objects such as materials, media and cylinder walls inside the mill cylinder, coupled with system speed fluctuations, Influenced by factors such as acceleration fluctuations and power supply voltage fluctuations, performance parameters such as vibration frequency, amplitude, excitation force, and vibration intensity of the system will change, forming a system with variable load characteristics. The current situation is that this type of vibration mill will have the following problems, especially after the large-scale problem is more prominent:

(1) High energy consumption: Since there is a low-energy area inside the mill cylinder and it is a constant stiffness system, the energy consumption of the mill system under variable load characteristics is still high and the efficiency is low.

(2) Structural fragility: The local body structure is weak, easily distorted, and easily damaged; resulting in high frequency of repairs or ineffective repairs.

(3) Bearing problems: There are impacts, collisions, and frictional loads among the various parts of the bearings, resulting in a vicious cycle of heat generation, wear, and lubricant waste pollution, which greatly increases the probability of bearing failure.

(4) Spring problem: metal coil springs, air springs or rubber springs are mostly used in vibrating mills. When there is damping, the amplitude is large and the body stress is large. When the damping is large, the amplitude is small and the efficiency is significantly reduced.

(5) Vibration isolation problem: The vibration isolation effect of the single-mass vibration system is poor when it is working. Under the continuous, large and changing impact, collision, shear and other variable loads, on the one hand, the vibration will be directly transmitted to the equipment foundation and affect To the peripheral equipment and buildings, in severe cases, the machine will be damaged and stop production, the life of the long-term running machine will be shortened, the wearing parts will fail prematurely, and the frequency of maintenance will increase, which will affect the normal operation of the vibration mill; on the other hand, it will generate large noise as a source of noise pollution Seriously affect the operator and the surrounding environment or make it unbearable.

(6) Restriction of large-scale: The above-mentioned problems have always been a problem that has plagued the development of vibratory mills, and has severely restricted their large-scale or extra-large size.

Contents of the invention

The object of the present invention is to provide a variable stiffness two-mass vibrating motor type extra-large vibrating mill for the above disadvantages. It is to solve the above problems in the prior art. On the basis of theoretical analysis and test simulation, a A general vibrating mill or extra-large vibrating mill with variable stiffness, two-mass body, and vibrating motor excitation.

Technical scheme of the present invention is as follows:

Aiming at the linear helical spring and single-mass structure of the aforementioned vibrating mill, the present invention adopts a nonlinear variable stiffness helical metal rubber coating main vibration spring, a variable stiffness helical metal rubber coated composite vibration isolation spring and a two-mass structure. The present invention has at least A cylinder, the vibration motor part is rigidly fixed on the cylinder as a vibration driving device, and the cylinder is excited on one side in a biased manner, that is, it is excited outside the gravity axis and center of gravity of the cylinder, which is a balanced vibration The mass of the motor is provided with a balance body, the axis of the spring on the driving side is located between the cylinder and the gravity axis of the vibration motor part, and the vibration motor part is driven, and the grinding medium in the cylinder can produce circular, elliptical and linear vibrations of different sizes The combination of uneven vibration is the effect of the system with variable stiffness characteristics. The change of system load will make the circular, elliptical, and linear dimensions of the vibration track of the grinding medium change to a certain extent, which will be beneficial. Improve the crushing efficiency of the system.

In the present invention, the vibration motor is both a power source and an excitation source. It is connected to one side of the barrel through a coupling frame. Whether the vibrating motor is located on the left or the right, its direction of rotation is exactly opposite to the flow direction of the grinding medium in the barrel. Rotary motion of the material.

The advantage of the present invention as one-sided excitation is that the additional elliptical and linear vibrations of different sizes at different times play an important role in improving the conveying process by increasing the rotational speed, which is decisive for the grinding effect.

The variable stiffness two-mass vibrating motor type extra-large vibrating mill of the present invention includes an upper plastid, a lower plastid, a main vibration spring, a vibration isolation spring and a bottom plate, wherein the upper plastid includes a cylinder, a feeding port, an end cover, and a discharge Mouth, vibrating motor, right coupling frame, grinding medium, left coupling frame and counterweight body, the cylinder body is actively supported on the lower body through the main vibration spring. On the right side of the cylinder body, a vibration motor is rigidly fixed with a right coupling frame, and the axis of the main vibration spring on the driving side is located between the gravity axis of the cylinder body and the vibration motor. The inner diameter of the main vibration spring is matched with the outer diameter of the main vibration spring guide column to play a supporting and guiding role to achieve the purpose of making the main vibration spring work stably; the lower body is supported on the base by the vibration isolation spring, and the inner diameter of the vibration isolation spring Cooperating with the outer diameter of the vibration isolation spring guide column, it also plays a supporting and guiding role. Similarly, on the left side of the cylinder body, a counterweight body that is balanced with the mass on the right side is fixed with the left coupling frame, and the axis of the main vibration spring on the left side is located between the gravity axis of the cylinder body and the counterweight body.

The upper body and the lower body are connected by the main vibration spring, and the inner diameter of the main vibration spring matches the outer diameter of the main vibration spring guide column on the upper and lower body, so that the main vibration spring can be stabilized under large amplitude The purpose of the work: the lower body is supported on the base by the damping spring; when working, the vibration motor drives the upper body to move, and due to the action of the main vibration spring and the vibration damping spring, the upper and lower bodies move at different amplitudes and accelerations. vibration. Obviously, the upper plastid has a larger amplitude and acceleration, which can improve the impact and crushing capacity of the material in the grinding cylinder; the lower plastid has a smaller amplitude and acceleration, and the vibration isolation spring can greatly reduce the vibration transmitted to the foundation. load.

The variable stiffness characteristic of the present invention can significantly reduce the proportion of the weak energy area of the cylinder body, thereby reducing energy consumption and improving the energy utilization rate of the vibrating mill. Together with the dual-mass body, the vibration isolation performance is better than that of the prior art, and the structure is reliable. The technical characteristics of high performance, low noise and long life of spring-bearing provide conditions for the further enlargement of today's eccentric vibratory mills and extra-large eccentric vibratory mills.

Below to the technical characterictic of two mass body in the present invention, main vibrating spring, vibration-isolation spring three elements, implementation means describe it in detail:

(1) Two-mass structure: The double-mass in the present invention can make the upper and lower bodies have two modes of main vibration and vibration isolation, and realize different amplitudes and vibration accelerations. It can be seen from the inventor's experimental research that between the upper plastid and the foundation, it is separated by the lower plastid, which can play a good role in vibration isolation, which is incomparable compared with the commonly used single-mass vibration system. Compared with the vibration isolation effect.

The frequency of the vibration isolation mode in the two-mass vibratory mill system is usually much smaller than the frequency of the main vibration mode. At this time, the dynamic load transmitted by the machine to the foundation is reduced, and the vibration transmitted to the foundation or floor when the machine is working will also be reduced. decrease.

In the present invention, the upper plastid is an object that itself carries the excitation source. Due to the complexity of multi-phase material collisions in the vibration mill system, the system constructs a dual-plast vibration structure with obvious vibration isolation effect, which can reduce the probability of system failure and improve The stability of system operation.

(2) Main vibrating spring: The main vibrating spring in the present invention is a variable-pitch helical rubber-coated metal spring, which is coated with a metal helical compression spring and a rubber coating. It can also be arranged in two directions according to the small size at the two ends and the large size in the middle. The characteristic lines are all increasing nonlinear lines; the rubber is made of synthetic rubber with more than 80% natural rubber.

In the main vibration spring, due to the change of the pitch of the helical structure that constitutes the spring, coupled with the rubber coating, it can have obvious nonlinear and required variable stiffness characteristics, that is, the use of nonlinear vibration can form a system with a stiffness that varies with the load. The characteristics of increasing as the load increases and decreasing as the load decreases can significantly reduce the drive energy consumption of the system, and achieve the purpose of increasing system efficiency, effective energy saving, and stable operation. It can be seen from the power spectrum graph and acceleration time domain graph of the inventor's experiment that the inertial force of the vibration system can be significantly improved by using the time domain and frequency domain change characteristics of the system output acceleration brought about by nonlinear vibration, and the same granularity can be achieved. Compared with conventional vibration, the vibration time is greatly shortened, the work efficiency is significantly increased, and the granularity is significantly increased.

In the main vibration spring, the metal helical spring acts as a supporting skeleton, and the rubber coating acts to increase the nonlinear characteristics and damping of the spring. During operation, it can improve the bearing capacity, especially when the system load increases, changes suddenly or overloads and the coils merge. , Increase the rigidity of the system and the effect of noise reduction, noise reduction and vibration reduction.

(3) Vibration isolation spring: The vibration isolation spring in the present invention is a variable-pitch helical metal-rubber composite spring, which is composed of a variable-pitch helical metal spring and a rubber spring. The variable-pitch helical metal spring is composed of a steel wire wound into a helical structure. The surface of the metal spring is covered with rubber vulcanization in a special mold to form a cylindrical variable-pitch helical metal-rubber composite spring.

The characteristic line of the metal spring in the vibration isolation spring is a nonlinear line, which can play the role of supporting the skeleton; the size of the pitch can be different between each ring, or it can be several different rings as a group. The pitch; the pitch can be arranged in one direction from small to large, or can be arranged in two directions according to the small at the two ends and the large in the middle; the rubber coating will increase the nonlinear characteristics and damping of the spring, and use the nonlinear characteristics to improve the bearing capacity. , The effect of reducing energy consumption, the increased damping is beneficial to prevent the occurrence of system resonance and flutter, play the role of vibration isolation and noise reduction, and can minimize the impact on the equipment foundation.

Compared with the rubber spring, the variable-pitch helical metal-rubber composite spring in the present invention has greater rigidity and greater damping performance than the metal spring, so its effect is positive, obvious and unique, so it is especially suitable for mines Suspension structure of machinery, heavy vehicles, extra-large vibrating machinery such as extra-large vibrating mill, vibrating screen, feeder and other occasions with large load and wide load variation range.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing:

Concrete structure and embodiment that the present invention proposes see accompanying drawing

Fig. 1 is a front view of an extra-large vibrating mill of variable stiffness two-mass vibrating motor type according to the present invention.

Fig. 2 is a B-B cross-sectional view of the double-mass vibrating motor type extra-large vibrating mill with variable stiffness of the present invention in Fig. 1 .

Fig. 3 schematically expresses the working principle of the vibration mill of the present invention.

FIG. 4 is a schematic representation of an embodiment of the vibrating mill of the present invention with a vibrating motor.

Fig. 5 is a schematic representation of the implementation form in which the counterweight of the vibration mill of the present invention adopts a vibration motor.

Fig. 6 schematically expresses the implementation form of the vibrating mill of the present invention with two vibrating motors.

Fig. 7 schematically expresses the implementation form of the vibrating mill of the present invention having four vibrating motors.

Marks in the figure: 1. Vibration motor, 2. Cylinder body, 3. Feed inlet, 4. End cover, 5. Main vibration spring, 6. Main vibration spring guide column, 7. Lower body, 8. Base, 9 , vibration isolation spring, 10, vibration isolation spring guide post, 11, discharge port, 12, right coupling frame, 13, grinding medium, 14, left coupling frame, 15, counterweight body, 16, vibration motor.

Detailed ways

Referring to the accompanying drawings 1-2, the variable stiffness two-mass vibrating motor type extra-large vibration mill includes an upper body, a main vibration spring 5, a main vibration spring guide column 6, a lower body 7, a base 8, a vibration isolation spring 9 and an isolation body. The vibrating spring guide post 10, wherein the upper body includes a vibration motor 1, a cylinder body 2, a feed port 3, an end cover 4, a discharge port 11, a right coupling frame 12, a grinding medium 13, a left coupling frame 14, and a counterweight body 15 .

In the structure shown in accompanying drawings 1-2, the cylindrical body 2 is movably supported on the lower mass body 7 through the main vibrating spring 12 . On the right side of the cylinder 2, the vibration motor 1 is rigidly fixed with the right coupling frame 12, and the axis of the main vibrating spring 5 on the driving side is located between the gravity axis of the cylinder 2 and the vibration motor 1. The inner diameter of the main vibration spring 5 is matched with the outer diameter of the main vibration spring guide column 6 to play a supporting and guiding role, so as to achieve the purpose of making the main vibration spring work stably; the lower body 7 is supported on the base 8 by the vibration isolation spring 9, The inner diameter of the vibration isolation spring 9 cooperates with the outer diameter of the vibration isolation spring guide column 10, which also plays a supporting and guiding role. Similarly, on the left side of the cylinder body 2, a counterweight body 15 that is balanced with the mass on the right side is fixed with the left coupling frame 14, and the axis of the main vibrating spring 5 on the left side is located between the gravity axis of the cylinder body 2 and the counterweight body 15. between. The inside of the cylinder is equipped with medium balls of different particle sizes and the materials to be ground. The figure shows the movement process of the grinding medium in the cylinder when the vibration motor rotates clockwise. The figure shows the end cover 4 on the cylinder. , the feed port 3, the discharge port 11, the counterweight body 15 adopts a box-type structure with a built-in weight, and is rigidly consolidated on the left side of the cylinder body with the left coupling frame 14 to achieve the same quality as the vibration motor on the right side. balance.

There is at least one vibration motor.

When working, the vibrating motor 1 drives the movement of the entire upper mass body. As seen from Figures 3 and 4, due to one-sided excitation, the vibration track of the grinding medium 13 in the cylinder 2 is circular on the side where the vibrating motor 1 is located, passing through the ellipse in the center. Shaped vibration, transformed into linear vibration on the opposite side of cylinder 2 and vibration motor 1; due to the effect of system variable stiffness characteristics, the change of system load makes the circular, elliptical, and linear dimensions of the vibration track of the grinding medium change. There is a certain range of changes, which will help improve the crushing efficiency of the system.

Due to the action of the main vibration spring 5 and the vibration isolation spring 9, the upper and lower mass bodies vibrate with different amplitudes and accelerations respectively. Obviously, the upper plastid has a larger amplitude and acceleration, which can improve the impact and crushing ability of the medium in the cylinder body 2 on the material; Small dynamic loads transmitted to the foundation.

Accompanying drawing 3 shows that when the vibration motor is arranged on the left side outside the gravity axis and the center of gravity and is driven to rotate counterclockwise, the grinding medium 13 in the cylinder body 2 rotates clockwise, and the grinding medium 13 on the side of the vibration motor During circular rotation vibration, the center and right side of the cylinder vibrate in an ellipse and a straight line respectively, and the distance between the axis of the vibration motor parallel to the axis of the cylinder is greater than the minimum distance between the midpoint of the cylinder and the inner wall of the cylinder.

Compared with the prior art of vibration mill, the present invention has the following advantages:

The unilateral excitation of variable stiffness characteristics of the present invention, the addition of elliptical and linear vibrations of different sizes at different times plays an important role in improving the transmission process by increasing the rotation speed, and this has decisive significance for the grinding effect;

The variable stiffness characteristic of the present invention can significantly reduce the proportion of the weak energy area of the cylinder body, thereby reducing energy consumption and improving the energy utilization rate of the vibration mill;

Compared with the prior art, the present invention has the characteristics of variable stiffness and two-mass structure. It has the characteristics of good vibration isolation performance, high structural reliability, low noise and long life of spring-bearing. Conditions are provided for further enlargement.

The cylinder structural units with the same diameter can be connected into mills with different lengths to meet different grinding operations and residence times, which makes modular design possible.

Four kinds of embodiments of the present invention are introduced below, and the main vibration, vibration isolation spring and dual-mass structure are the same as above, so no further details are given:

Accompanying drawing 4 schematically expresses the implementation form of the vibrating mill of the present invention with a vibrating motor.

It has a vibratingly supported mill container, which can be an extra large vibrating mill cylinder body 1 with a diameter of 1.8 meters, and one side of it is rigidly connected with a vibrating motor 1 outside the axis of gravity and the center of gravity. The balance of the vibrating motor mass is accomplished by a counterweight body 15 that is arranged on the opposite side axis of the cylinder to balance with it.

Accompanying drawing 5 schematically expresses the implementation form that the counterweight of the vibration mill of the present invention can be replaced by a vibration motor. The counterweight 15 on one side of the cylindrical body 2 can be replaced by a second vibrating motor 16 . Vibrating mill can be selected or driven by vibrating motor 1 or vibrating motor 16, at this moment, another vibrating motor (16 or 1) always plays the role of balancing mass. This structural form allows the vibration mill to work with different vibration motor parameters, such as rotational speed and diameter of the vibration circle.

Accompanying drawing 6 shows the embodiment that one side of the vibration mill of the present invention has two vibration motors. In this example, the diameter of the cylinder 1 can be 3.7 meters, and one side of the cylinder is equipped with two synchronously working vibrating motors (1a, 1b) that overlap up and down and act as excitation vibrations outside the gravity axis and center of gravity of the cylinder. . The balance of vibrating motor mass can be realized with counterweight body 15.

Shown in accompanying drawing 7 is the embodiment that the vibration mill of the present invention has four vibration motors. In order to adapt to different grinding operations, two structural units A, B, etc. can be combined in one vibration mill. As shown in the figure, each structural unit can be equipped with 2 vibration motors, and can have four vibration motors.

Claims (4)

1. one kind becomes the super-huge vibromill of rigidity double-mass vibrating electric motor type, it is characterized in that comprising plastid, following plastid, main vibration spring, isolation spring and base, wherein go up plastid and comprise cylindrical shell, charging aperture, end cap, discharging opening, vibrating motor, right hitch, mill Jie, left hitch and balance weight body; Cylindrical shell by main vibration spring actively twelve Earthly Branches hold on following plastid, right side at cylindrical shell is consolidated with vibrating motor with right hitch rigidity, the axis of the main vibration spring of driving side is between the gravity axis of cylindrical shell and vibrating motor, the internal diameter of main vibration spring matches with the external diameter of its main vibration spring guide pillar, play the support guide effect, reach the purpose that makes the main vibration spring steady operation; Following plastid is bearing on the base by isolation spring, the internal diameter of isolation spring matches with the external diameter of isolation spring guide pillar, play the support guide effect equally, left side at cylindrical shell is consolidated with the balance weight body that balances each other with the right side quality with left hitch rigidity, and the axis of the main vibration spring in left side is between the gravity axis of cylindrical shell and balance weight body.

2. the super-huge vibromill of change rigidity double-mass vibrating electric motor type according to claim 1, it is characterized in that described going up between plastid, the following plastid links by main vibration spring, the main vibration spring internal diameter matches with main vibration spring guide pillar external diameter on the upper and lower plastid, plays the purpose that still can make the main vibration spring steady operation under large amplitude.

3. the super-huge vibromill of change rigidity double-mass vibrating electric motor type according to claim 1 is characterized in that described balance weight body adopts the case structure of built-in pouring weight, is consolidated in the cylindrical shell left side with left hitch rigidity.

4. the super-huge vibromill of change rigidity double-mass vibrating electric motor type according to claim 1 is characterized in that described vibrating motor has one at least.

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