CN201862561U

CN201862561U - Double-track vibrating screen

Info

Publication number: CN201862561U
Application number: CN2010206266788U
Authority: CN
Inventors: 牟长清; 柴占文; 许锦华; 侯召坡; 代青
Original assignee: Huayouyiji (hebei) Drilling Equipment Co Ltd; CNPC Bohai Equipment Manufacturing Co Ltd
Current assignee: Huayouyiji (hebei) Drilling Equipment Co Ltd; CNPC Bohai Equipment Manufacturing Co Ltd
Priority date: 2010-11-26
Filing date: 2010-11-26
Publication date: 2011-06-15
Anticipated expiration: 2020-11-26

Abstract

The utility model discloses a double-track vibrating screen comprising a vibration exciter, a screen box, a base and a vibration isolating device, wherein the vibration exciter comprises a front vibration motor, a back vibration motor, a front eccentric block and a back eccentric block; the front eccentric block comprises a movable eccentric block and a fixed eccentric block; the movable eccentric block can relatively rotate around a front vibration motor shaft; the fixed eccentric block is fixed on the front vibration motor shaft; the weight of the movable eccentric block accounts for one quarter of the total weight of the front eccentric block; the main body of the movable eccentric block has the one-quarter round structure; a half-round structure and the one-quarter round structure are superposed and fixed to form the fixed eccentric block; and the movable eccentric block and the fixed eccentric block are matched to form the front eccentric block formed by superposing two pieces of half-round structures. The double-track vibrating screen realizes the conversion between a straight line and a transitional elliptic motion trail in the condition that a machine does not stops; the double-track vibrating screen is convenient to operate, is reliable in performance and can well adapt to complicated well boring operation conditions.

Description

The dual trace vibratory sieve

Technical field

The utility model relates to drilling fluid treatment facility in a kind of oil drilling industry, especially a kind of dual trace vibratory sieve.

Background technology

At present, domestic and international employed vibratory sieve normally is made up of screen box, base and vibrator, and vibrator comprises motor and eccentric block, and the motor drives eccentric block rotates and produces centrifugal intertia force, claims exciting force again, thereby makes the vibratory sieve motion; When " centre of force " of centrifugal intertia force overlaps with the barycenter of vibratory sieve screen box integral body, vibratory sieve screen box integral body is made translational motion, therefore according to the oscillation trajectory difference, vibratory sieve can be divided into two kinds of linear vibrating screen and balanced elliptical shale shakers, its characteristics are as follows: 1. linear vibrating screen is applicable to based on sand layers, sand grains is many, mud amount is big stratum, and for the mud stone layer, the bottom of the little and thickness of mud particle, the use straight path is handled, serious problem of sticking with paste screen cloth can occur, occur running phenomenons such as slurry, long-pending sand then; 2. balanced elliptic mark vibratory sieve is applicable to the bottom of the little and thickness of mud particle, and for sand layers, the stratum that the mud sand grains is many, mud amount is big, it is very fast sediment outflow speed to occur, and treating capacity is little, phenomenons such as slurry occur running.

The patent No. is to have proposed the oval straight-line oscillation type vibratory sieve that becomes of a kind of change in 01213819.3, design by two vibrating shafts guarantees that with mounting means the centre of force that exciting is made a concerted effort does not overlap with the barycenter of vibratory sieve, realized that the major and minor axis orientation of elliptical orbit, the rectilinear direction of straight path carve inequality at a time, has bigger screening vertical component in the drilling fluid porch, and have bigger chip removal horizontal component at the port of export, improved screening efficiency and transporting velocity.This version can produce good effect, but very high to installation requirement, and reliability of operation requires also very high, under the drillng operation condition of complexity, is difficult to meet the demands.The patent No. is the 99232313.4 a kind of twin shaft balanced elliptical shale shakers that propose, produce eccentric force by two eccentric shafts with different eccentric blocks, realize the dual-axis vibration sieve of the balanced elliptic vibration shape, this structure can only realize a kind of motion, is restricted when being to use in actual production.According to the retrieval, U.S. Mi SWACO company has released MONGOOSE dual trace vibratory sieve, and its structure adopts three motor combination, just can change amplitude and oscillation trajectory simultaneously by the start-stop motor, and it is progressive significantly that the vibratory sieve adjustability is obtained.But some is bigger than normal on the structure of this vibratory sieve, and the direction of rotation of motor, start and stop control all need higher reliability to guarantee, can limit its range of application.In sum, at present domestic vibratory sieve movement locus is single, and the vibration force size is difficult to regulate, and complicated operation, overall performance are difficult to satisfy complicated drillng operation requirement.

The utility model content

The technical problems to be solved in the utility model provides a kind of simple and compact for structure, the dual trace vibratory sieve of dependable performance.

For solving the problems of the technologies described above, technical solution adopted in the utility model is: a kind of dual trace vibratory sieve, comprise vibrator, screen box, base and isolation mounting, described screen box is connected with base by isolation mounting, described vibrator comprises preceding vibrating motor, the after vibration motor, pre-eccentric piece and back eccentric block, described back eccentric block is that two semicircular structure stacks fixedly form, described pre-eccentric piece and preceding nested cooperation of vibrating motor axle, described back eccentric block and the nested secure fit of after vibration motor shaft, it is characterized in that: described pre-eccentric piece comprise can and be fixed in around the movable in relative rotation eccentric block of preceding vibrating motor axle before the fixed eccentric block of vibrating motor axle, described movable eccentric block accounts for 1/4 of described pre-eccentric piece gross weight, described movable eccentric block is that main body is 1/4 circular configuration, described fixed eccentric block is that a semicircle and one 1/4 circular configuration stack are fixing, and described movable eccentric block cooperates the pre-eccentric piece that forms two semicircle stacks with described fixed eccentric block.

The both ends of the surface of 1/4 circle of described fixed eccentric block are fixed with buffer stopper, and described buffer stopper is that polyurethane material is made.The movement locus that changes vibratory sieve when needs is, the change of vibrating motor direction of rotation before need making, and in order to prevent that producing violent bump damages eccentric block, therefore being provided with buffer stopper protects the operation of a machine, improves integrally-built reliability.

The utility model can be realized the rectilinear motion and the translation elliptic motion of vibratory sieve, it is the realization that turns to of controlling two vibrating motors (preceding vibrating motor and after vibration motor) by special control circuit, current vibrating electrode clockwise rotates, when the after vibration motor rotates counterclockwise, the utility model can produce the balanced elliptic motion, current vibrating electrode rotates counterclockwise, and when the after vibration motor clockwise rotated, the utility model can produce rectilinear motion.When design and installation, if need to realize the balanced elliptic motion, then the centre of force and screen box center of gravity overlap, and must guarantee that simultaneously the force action line is by the screen box barycenter when forming rectilinear motion.

Adopt the beneficial effect that technique scheme produced to be: 1. the utility model can be under non-stop-machine situation, controls the direction of rotation of motor by external control circuit, realizes the conversion between straight line and the translation elliptical trajectory, handled easily; 2. include only two drive motors in the vibrator of the present utility model, and the eccentric block structure of pre-eccentric piece and back is simple, dependable performance can be good at using complicated drillng operation.

Description of drawings

Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is the pre-eccentric block structure schematic diagram on the preceding vibrating motor;

Fig. 3 is the back eccentric block structure schematic diagram on the after vibration motor;

Fig. 4 is the pre-eccentric bulk state of preceding vibrating motor axle when clockwise rotating;

Fig. 5 is that vibratory sieve is made the balanced elliptic structure principle chart in when motion;

Structure principle chart when Fig. 6 is the vibratory sieve moving linearly;

Wherein, 1, preceding vibrating motor, 2, the after vibration motor, 3, screen box, 4, base, 5, isolation mounting, 6, the pre-eccentric piece, 7, the back eccentric block, 8, movable eccentric block, 9, buffer stopper, 10, fixed eccentric block, 11, preceding vibrating motor axle, 12, the after vibration motor shaft.

The specific embodiment

1-3 as can be known with reference to the accompanying drawings, the utility model relates to a kind of dual trace vibratory sieve, comprise vibrator, screen box 3, base 4 and isolation mounting 5, described screen box 3 is connected with base 4 by isolation mounting 5, described vibrator comprises preceding vibrating motor 1, after vibration motor 2, pre-eccentric piece 6 and back eccentric block 7, described back eccentric block 7 is that two semicircular structure stacks fixedly form, described pre-eccentric piece 6 and preceding 11 nested cooperations of vibrating motor axle, described back eccentric block 7 and after vibration motor shaft 12 nested secure fit, it is characterized in that: described pre-eccentric piece 6 comprises can be around the movable in relative rotation eccentric block of preceding vibrating motor axle 11 8 and the fixed eccentric block 10 of vibrating motor axle 11 before being fixed in, described movable eccentric block 8 accounts for 1/4 of described pre-eccentric piece 6 gross weights, described movable eccentric block 8 is 1/4 circular configuration for main body, described fixed eccentric block 10 is that a semicircle and one 1/4 circular configuration stack are fixing, and described movable eccentric block 6 cooperates the pre-eccentric piece 6 that forms two semicircle stacks with described fixed eccentric block 10.

From accompanying drawing 1, can see, screen box 3 is generally isolation spring by isolation mounting 3() place on the base, vibrating motor 1 and after vibration motor 2 before the front upper place horizontal positioned of screen box 3, preceding vibrating motor 1 connects pre-eccentric pieces 6 by preceding vibrating motor axle 11, because pre-eccentric piece 6 is formed (accompanying drawing 2) by movable eccentric block 8 and fixed eccentric block 10, the weight of movable eccentric block 8 accounts for 1/4 of pre-eccentric piece 6 weight, when therefore current vibrating motor 1 counterclockwise rotates, screen box 3 lower flat promotion activity eccentric blocks 6 turn round continuously, this moment the vibration force maximum, vibratory sieve is done rectilinear motion, when clockwise direction rotates, preceding vibrating motor axle 11 upper plane promotion activity eccentric blocks 6 turn round continuously, this moment, movable eccentric block 6 was offset with the part power of fixed eccentric block 10, vibration force has reduced half, and the back eccentric block 7 of vibrating motor 2 connections is then remaining 100% vibration force, and vibratory sieve is done the balanced elliptic motion like this.There is the buffer stopper 9 of polyurethane material movable eccentric block 6 two sides, produce violent bump when preventing to turn suddenly, and protective device is destroyed.According to the bi-motor self synchronization theory, after motor reached certain rotating speed, the eccentric block of two motors can produce specific relative angle (accompanying drawing 4).

With reference to the accompanying drawings 5 and accompanying drawing 6, the utility model can be realized the rectilinear motion and the translation elliptic motion of vibratory sieve, its oscillation trajectory and Oscillation Amplitude transforming principle are: calculate and experiment according to the theory of the motor synchronizing inertia vibrating machine of Dual-motors Driving, determine that two vibrating motors (preceding vibrating motor 1 and after vibration motor 2) are installed in the appropriate location of vibratory sieve, control the direction of rotation of two vibrating motors.If preceding vibrating electrode 1 clockwise rotates, after vibration motor 2 rotates counterclockwise, and when the vibration force of two motors ratio is 1:2, whole screen box 3 is the balanced elliptic motion, if preceding vibrating electrode 1 rotates counterclockwise, after vibration motor 2 clockwise rotates, and the vibration force of two motors is the straight-line oscillation track than whole screen box 3 when the 1:1, realizes the exchange of two kinds of oscillation trajectories with this.

Claims

1. dual trace vibratory sieve, comprise vibrator, screen box (3), base (4) and isolation mounting (5), described screen box (3) is connected with base (4) by isolation mounting (5), described vibrator comprises preceding vibrating motor (1), after vibration motor (2), pre-eccentric piece (6) and back eccentric block (7), described back eccentric block (7) is that two semicircular structure stacks fixedly form, described pre-eccentric piece (6) and nested cooperation of preceding vibrating motor axle (11), described back eccentric block (7) and the nested secure fit of after vibration motor shaft (12), it is characterized in that: described pre-eccentric piece (6) comprises can be around the movable in relative rotation eccentric block of preceding vibrating motor axle (11) (8) and the fixed eccentric block (10) of vibrating motor axle (11) before being fixed in, described movable eccentric block (8) accounts for 1/4 of described pre-eccentric piece (6) gross weight, described movable eccentric block (8) is 1/4 circular configuration for main body, described fixed eccentric block (10) is that a semicircle and one 1/4 circular configuration stack are fixing, and described movable eccentric block (6) cooperates the pre-eccentric piece (6) that forms two semicircle stacks with described fixed eccentric block (10).

2. dual trace vibratory sieve according to claim 1 is characterized in that the both ends of the surface of 1/4 circle of described fixed eccentric block (10) are fixed with buffer stopper (9), and described buffer stopper is that polyurethane material is made.