阅读说明：本技术 一种适用于高速旋转下的偏心块 (Eccentric block suitable for high-speed rotation ) 是由 王建强 陈永辉 徐健 潘凯 董万元 于 2021-09-01 设计创作，主要内容包括：本申请涉及振动机械技术领域,为一种适用于高速旋转下的偏心块,包括底盘、第一固定件、固定半圆和活动半圆；所述底盘的中部中心通孔,所述第一固定件设于中心通孔内并连接于底盘与转轴之间,所述固定半圆和活动半圆分别设于底盘的同侧不同位置,所述固定半圆与底盘相互固定；所述底盘对应活动半圆的位置处开设有沿着长度方向能够靠近或远离固定半圆的方向设置的滑移槽,所述滑移槽与活动半圆之间设有与滑移槽滑移配合的滑移件,所述活动半圆通过滑移件能够靠近或远离固定半圆。能够对发动机旋转不平衡振动进行有效模拟,以为发动机传递振动试验提供有效的振动载荷输入。(The application relates to the technical field of vibration machinery, in particular to an eccentric block suitable for high-speed rotation, which comprises a chassis, a first fixing piece, a fixed semicircle and a movable semicircle; the first fixing piece is arranged in the central through hole and connected between the chassis and the rotating shaft, the fixed semicircle and the movable semicircle are respectively arranged at different positions on the same side of the chassis, and the fixed semicircle and the chassis are mutually fixed; the chassis is corresponding to the position department of activity semicircle and is offered the groove of sliding that can be close to or keep away from the direction setting of fixed semicircle along length direction, it slides the complex sliding member with the groove of sliding to slide to be equipped with between groove and the activity semicircle, the activity semicircle can be close to or keep away from fixed semicircle through sliding member. The method can effectively simulate the rotation unbalance vibration of the engine to provide effective vibration load input for the engine transmission vibration test.)

1. An eccentric block suitable for high-speed rotation is characterized in that: comprises a chassis (2), a first fixed part, a fixed semicircle (3) and a movable semicircle (4);

the middle part of the chassis (2) is provided with a central through hole (10), the first fixing piece is arranged in the central through hole (10) and connected between the chassis (2) and the rotating shaft, the fixed semicircle (3) and the movable semicircle (4) are arranged at different positions on the same side of the chassis (2), and the fixed semicircle (3) and the chassis (2) are fixed with each other;

a sliding groove which is arranged along the length direction and can be close to or far away from the fixed semicircle (3) is formed in the position, corresponding to the movable semicircle (4), of the chassis (2), a sliding piece which is in sliding fit with the sliding groove is arranged between the sliding groove and the movable semicircle (4), and the movable semicircle (4) can be close to or far away from the fixed semicircle (3) through the sliding piece;

and a second fixing piece capable of fixing the movable semicircle (4) when the movable semicircle (4) moves to any position of the stroke is arranged between the movable semicircle (4) and the chassis (2).

2. An eccentric mass adapted for high speed rotation as defined in claim 1 wherein: the sliding part comprises a first screw (21) and a square nut (6), a second screw hole (19) is formed in the movable semicircle (4), the first screw (21) is in threaded connection with the second screw hole (19), and the square nut (6) is in threaded connection with the tail end of the first screw (21); the groove that slides includes U type groove (13) and rectangular channel (18), U type groove (13) are located between the head of rectangular channel (18) and first screw (21), the width in U type groove (13) is less than the width of square nut (6) and rectangular channel (18), square nut (6) sliding fit is in rectangular channel (18).

3. An eccentric mass adapted for high speed rotation as defined in claim 2 wherein: and scale values are marked on the U-shaped groove (13).

4. An eccentric mass adapted for high speed rotation as defined in claim 2 wherein: the side wall of the fixed semicircle (3) is provided with a third screw hole (22), the chassis (2) is provided with a threaded through hole (17) corresponding to the position of the fixed semicircle (3), and the third screw hole (22) is internally connected with a fixing screw (5) and the tail end of the fixing screw (5) is in threaded connection with the threaded through hole (17).

5. An eccentric mass adapted for high speed rotation according to claim 4, wherein: the second screw hole (19) and the third screw hole (22) are both countersunk holes.

6. An eccentric mass adapted for high speed rotation as defined in claim 1 wherein: the second fixing piece comprises a square boss (20), an adjusting screw (7) and an adjusting back nut (8); a fixed groove (14) which is parallel to the sliding groove is formed in the position, corresponding to the square boss (20), of the chassis (2), and the square boss (20) is in sliding fit with the fixed groove (14); set up first screw (15) with fixed slot (14) intercommunication on the outer wall of chassis (2), adjusting screw (7) and first screw (15) screw-thread fit and the end can stretch into in fixed slot (14) and offset with square boss (20), adjust back nut (8) threaded connection on adjusting screw (7) and lie in between the head and chassis (2) outer wall of adjusting back nut (8).

7. An eccentric mass adapted for high speed rotation as defined in claim 1 wherein: the first fixing piece is symmetrically arranged in a center through hole (10) of the chassis (2) and comprises two groups, the bearing bush (1) and a countersunk screw (9) are coaxially arranged in the center through hole (10) of the chassis (2), a third screw hole (22) is formed in the bearing bush (1), and the countersunk screw (9) is in threaded connection with the chassis (2) and the third screw hole (22) and can be locked and fixed on the rotating shaft.

8. An eccentric mass adapted for high speed rotation as defined in claim 7 wherein: the chassis (2) is provided with a hollow boss (11), the inner wall of the hollow boss (11) is attached to the outer wall of the bearing bush (1), the hollow boss (11) is provided with a first counter bore (12) communicated with a second screw hole (19), and the counter screw (9) is in threaded connection with the first counter bore (12).

9. An eccentric mass adapted for high speed rotation as defined in claim 1 wherein: an adjusting groove (16) is formed in the side wall of one side, away from the movable semicircle (4), of the chassis (2).

10. An eccentric mass adapted for high speed rotation as defined in claim 9 wherein: the adjusting groove (16) is a fan-shaped structure with the circle center at the axis of the chassis (2).

Technical Field

The application belongs to the technical field of vibrating machinery, and particularly relates to an eccentric block suitable for high-speed rotation.

Background

The vibration of the aircraft engine is mainly caused by unbalanced vibration of a rotor, and in the traditional vibration load loading method based on the vibration exciter/vibration table, the boundary is changed due to the additional rigidity brought by parts such as an excitation rod, and the transmission characteristic of the load and the like are further influenced. Therefore, an eccentric block capable of rotating at a high speed is urgently needed to be designed, the servo motor is used for driving the eccentric block on the rotating shaft to rotate, the basic characteristics of the rotation unbalance vibration of the engine are simulated, and the vibration load input is provided for the vibration transmission test of the engine.

Disclosure of Invention

The application aims to provide an eccentric block suitable for high-speed rotation so as to solve the problem that basic characteristics of engine rotation unbalance vibration in a vibration transmission load test in the prior art are difficult to simulate.

The technical scheme of the application is as follows: an eccentric block suitable for high-speed rotation comprises a chassis, a first fixing piece, a fixed semicircle and a movable semicircle; the middle part of the chassis is provided with a central through hole, the first fixing piece is arranged in the central through hole and connected between the chassis and the rotating shaft, the fixed semicircle and the movable semicircle are respectively arranged at different positions on the same side of the chassis, and the fixed semicircle and the chassis are mutually fixed; a sliding groove which can be close to or far from the fixed semicircle along the length direction is formed in the position, corresponding to the movable semicircle, of the chassis, a sliding piece in sliding fit with the sliding groove is arranged between the sliding groove and the movable semicircle, and the movable semicircle can be close to or far from the fixed semicircle through the sliding piece; and a second fixing part capable of fixing the movable semicircle when the movable semicircle moves to any position of the stroke is arranged between the movable semicircle and the chassis.

Preferably, the sliding part comprises a first screw and a square nut, a second screw hole is formed in the movable semicircle, the first screw is connected to the second screw hole in a threaded manner, and the square nut is connected to the tail end of the first screw in a threaded manner; the groove that slides includes U type groove and rectangular channel, U type groove is located between the head of rectangular channel and first screw, the width in U type groove is less than the width of square nut and rectangular channel, the square nut sliding fit is in the rectangular channel.

Preferably, the U-shaped groove is marked with scale values.

Preferably, a third screw hole is formed in the side wall of the fixing semicircle, a threaded through hole is formed in the position, corresponding to the fixing semicircle, of the chassis, and a fixing screw is connected in the third screw hole and the tail end of the fixing screw is connected in the threaded through hole in a threaded manner.

Preferably, the second screw hole and the third screw hole are both countersunk holes.

Preferably, the second fixing piece comprises a square boss, an adjusting screw and an adjusting back nut; a fixed groove arranged in parallel with the sliding groove is formed in the position, corresponding to the square boss, of the chassis, and the square boss is in sliding fit with the fixed groove; the adjusting device is characterized in that a first screw hole communicated with the fixing groove is formed in the outer wall of the chassis, the adjusting screw is in threaded fit with the first screw hole, the tail end of the adjusting screw can stretch into the fixing groove to be abutted against the square boss, and the adjusting back nut is in threaded connection with the adjusting screw and is located between the head of the adjusting back nut and the outer wall of the chassis.

Preferably, the first fixing pieces are symmetrically arranged in the central through holes of the chassis, the first fixing pieces comprise bearing bushes and countersunk screws, the bearing bushes are coaxially arranged in the central through holes of the chassis, third screw holes are formed in the bearing bushes, and the countersunk screws are in threaded connection with the chassis and the third screw holes and can be locked and fixed on the rotating shaft.

Preferably, a hollow boss is arranged on the chassis, the inner wall of the hollow boss is attached to the outer wall of the bearing bush, a first countersunk hole communicated with the second screw hole is formed in the hollow boss, and the countersunk screw is in threaded connection with the first countersunk hole.

Preferably, an adjusting groove is formed in the side wall of one side, away from the movable semicircle, of the chassis.

Preferably, the adjusting groove is a fan-shaped structure with the center at the axis of the chassis.

The utility model provides an eccentric block suitable for under high-speed rotation, the central point on chassis puts through first mounting is fixed in the pivot, through setting up fixed semicircle and activity semicircle, the activity semicircle can be close to or keep away from fixed semicircle through the sliding part to effectively adjust the eccentric value, through adjusting different eccentric values, can effectively simulate the various actual conditions of the rotatory unbalanced vibration of engine, in order to provide the vibration load input to engine vibration transmission experiment.

Preferably, through connecting first screw on the activity semicircle, at the end-to-end connection square nut of first screw, through set up U type groove and rectangular channel on the chassis, first screw passes U type groove and stretches into to the rectangular channel in, the cooperation of sliding of square nut and rectangular channel, and the width in U type groove is less than rectangular channel and square nut in order to prevent that the square nut from deviating from, realizes the stable regulation of eccentricity.

Drawings

In order to more clearly illustrate the technical solutions provided by the present application, the following briefly introduces the accompanying drawings. It is to be expressly understood that the drawings described below are only illustrative of some embodiments of the invention.

FIG. 1 is a schematic diagram of the overall structure of the present application;

FIG. 2 is a schematic view of a mating structure of a base plate and a square nut according to the present application;

FIG. 3 is a schematic view of a side of the movable semicircle of the present application;

FIG. 4 is a schematic structural diagram of a chassis side of the present application;

FIG. 5 is a schematic view of another side of the present invention chassis;

FIG. 6 is a schematic view of a connection structure of a first screw and a square nut according to the present application;

FIG. 7 is a schematic view of a fixed semi-circle structure of the present application;

FIG. 8 is a schematic view of the other side of the active semicircle of the present application;

FIG. 9 is a schematic view of an adjusting screw and an adjusting back nut according to the present application;

FIG. 10 is a schematic view of a bearing shell according to the present application;

fig. 11 is a schematic structural view of a countersunk head screw according to the present application.

1. Bearing bushes; 2. a chassis; 3. fixing the semicircle; 4. a movable semicircle; 5. a set screw; 6. a square nut; 7. an adjusting screw; 8. adjusting the back nut; 9. countersunk head screws; 10. a central through hole; 11. a hollow boss; 12. a countersunk hole; 13. a U-shaped groove; 14. fixing grooves; 15. a first screw hole; 16. adjusting the groove; 17. a threaded through hole; 18. a rectangular groove; 19. a second screw hole; 20. a square boss; 21. a first screw; 22. and a third screw hole.

Detailed Description

In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application.

An eccentric block suitable for high-speed rotation is shown in figures 1 and 2 and comprises a chassis 2, a first fixing piece, a fixed semicircle 3 and a movable semicircle 4. Chassis 2 is the disc structure and the middle part is central through-hole 10 (combination figure 4) for with the pivot cooperation, first mounting is located and is used for connecting chassis 2 and pivot in the central through-hole 10, and fixed semicircle 3 and activity semicircle 4 are located chassis 2's homonymy different positions, and fixed semicircle 3 and activity semicircle 4 are upper and lower setting in figure 1, and fixed semicircle 3 and activity semicircle 4 are contactless each other.

Fixed semicircle 3 is fixed on chassis 2, and chassis 2 corresponds the position department of activity semicircle 4 and offers the groove of sliding that can be close to or keep away from the direction setting of fixed semicircle 3 along length direction, and the groove of sliding is vertical setting in figure 2, slides and is equipped with between groove and the activity semicircle 4 and slides the complex piece that slides with the groove of sliding, and activity semicircle 4 can be close to or keep away from fixed semicircle 3 through the piece that slides.

And the chassis 2 is provided with a second fixing piece, and the movable semicircle 4 can be fixed through the second fixing piece when reaching any position of the stroke.

During the assembly embolia the pivot with chassis 2, through first mounting with chassis 2 and pivot reciprocal anchorage, the eccentric volume as required adjusts the distance between activity semicircle 4 and the fixed semicircle 3, adjusts and to accomplish back rethread second mounting will move about semicircle 4 fixed, drives the eccentric block high-speed rotation through servo motor when testing, the essential character of the rotatory unbalance vibration of simulation engine to for engine vibration transmission experiment provides effectual vibration load input. To the experiment that needs different eccentric magnitudes, only need to change the distance between fixed semicircle 3 and the activity semicircle 4 can, it is convenient to measure to simple structure, part are small in quantity, simple to operate, windage is less in the testing process, can guarantee experimental precision.

As shown in fig. 1, 2 and 3, preferably, the sliding member includes a first screw 21 and a square nut 6, the square nut 6 is disposed at a terminal of the first screw 21, the movable semicircle 4 is provided with a second screw hole 19, the first screw 21 is screwed to the second screw hole 19, and the square nut 6 is screwed to a terminal of the first screw 21.

As shown in fig. 4, 5 and 6, the sliding groove includes a U-shaped groove 13 and a rectangular groove 18, the U-shaped groove 13 is located between the rectangular groove 18 and the head of the first screw 21, the distance between the circle centers of two semicircles of the U-shaped groove 13 is 20mm, the width of the U-shaped groove 13 is smaller than the width of the square nut 6 and the rectangular groove 18, the end of the first screw 21 penetrates through the U-shaped groove 13 and extends into the rectangular groove 18, and the square nut 6 is in sliding fit in the rectangular groove 18.

First screw 21 is fixed in on the activity semicircle 4, when needing to adjust the eccentricity, removes activity semicircle 4, and square nut 6 slides about vertical in rectangular channel 18, and U type groove 13 can be spacing to square nut 6, prevents square nut 6 lateral shifting to guarantee the precision that activity semicircle 4 adjusted.

Preferably, the U-shaped groove 13 is marked with a scale value, and the eccentricity corresponding to the moving position of the movable semicircle 4 can be directly obtained through the scale value, so that the operation is convenient.

As shown in fig. 1, 5, and 7, preferably, a third screw hole 22 is formed on a side wall of the fixing semicircle 3, a threaded through hole 17 is formed at a position of the chassis 2 corresponding to the fixing semicircle 3, the fixing screw 5 is connected in the third screw hole 22, and a distal end of the fixing screw 5 is screwed in the threaded through hole 17. The fixing semicircle 3 is stably fixed on the chassis 2 by tightening the fixing screw 5.

Preferably, the second screw hole 19 and the third screw hole 22 are both countersunk holes, and the countersunk holes are arranged so that the bolts do not cause additional wind resistance when the eccentric block rotates.

As shown in fig. 1, 8, and 9, preferably, the second fixing member includes a square boss 20, an adjusting screw 7, and an adjusting back nut 8, a fixing groove 14 disposed in parallel with the sliding groove is formed at a position of the chassis 2 corresponding to the square boss 20, the square boss 20 is in sliding fit with the fixing groove 14, a first screw hole 15 communicated with the fixing groove 14 is formed on an outer wall of the chassis 2, the adjusting screw 7 is in threaded fit with the first screw hole 15, and a terminal of the adjusting screw 7 extends into the fixing groove 14 to abut against the square boss 20, and the adjusting back nut 8 is in threaded connection with the adjusting screw 7 and is located between a head of the adjusting back screw and the outer wall of the chassis 2.

When the movable semicircle 4 adjusts the distance, the adjusting screw 7 is not contacted with the square boss 20; after the eccentricity adjustment is completed, the adjusting screw 7 is screwed to the position where the adjusting screw abuts against the square boss 20 and is screwed, and then the adjusting back nut 8 is screwed, so that the movable semicircle 4 is stably fixed, and the movable semicircle 4 is prevented from deviating under high-speed rotation.

As shown in fig. 1, 10, and 11, preferably, two sets of first fixing members are symmetrically disposed in the central through hole 10 of the chassis 2, each first fixing member includes a bearing bush 1 and a countersunk screw 9, the bearing bush 1 is coaxially disposed in the central through hole 10 of the chassis 2, a third screw hole 22 is formed in the bearing bush 1, and the countersunk screw 9 is threadedly connected to the third screw hole 22 and can be fastened to the rotating shaft.

The chassis 2, the bearing bush 1 and the rotating shaft are connected with each other by screwing down the countersunk head screw 9, so that fixation is realized.

Preferably, the chassis 2 is provided with a hollow boss 11, the inner wall of the hollow boss 11 is attached to the outer wall of the bearing bush 1, the hollow boss 11 is provided with a first counter sink 12 communicated with the second screw hole 19, and the counter screw 9 is in threaded connection with the first counter sink 12. Carry on spacingly to axle bush 1 through setting up hollow boss 11, realize stable fixed, through setting up first counter sink 12, guarantee that eccentric block can not bring extra windage at rotation type countersunk screw 9.

Preferably, an adjusting groove 16 is formed on the side wall of the chassis 2 far away from the movable semicircle 4. Due to the fact that the weight of one side of the chassis 2 is reduced due to the arrangement of the U-shaped groove 13, the rectangular groove 18 and the fixing groove 14, the gravity center of the chassis 2 is changed, and the arrangement of the adjusting groove 16 can balance the gravity center position of the chassis 2, so that the gravity center is kept at the gravity center position of the chassis 2, and stability of the eccentric block under high-speed rotation is guaranteed.

Preferably, the adjusting groove 16 is a fan-shaped structure with a circle center at the axis of the chassis 2, and the arrangement of the circle center at the axis of the chassis 2 can effectively balance the center of gravity, thereby ensuring the balance of the chassis 2.

The eccentric block is tightly assembled, is suitable for eccentric rotation excitation within the rotating speed of 0-20000R/min, can realize stepless adjustment of 0-5000N at the rotating speed of 15000R/min, and can meet the requirements of rotating speed and exciting force in relevant tests of engine development of a certain country. The diameter of the central through hole 10 of the chassis 2 can be designed according to specific conditions, and can meet the requirements of various high-speed rotating shafts.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.