CN106914849B - A kind of high-precision screwdriver based on piezoelectric stack - Google Patents

Abstract

The present invention relates to a kind of high-precision screwdriver based on piezoelectric stack, belongs to a kind of screw tightening tool.It includes cutter head slot, screw rod, sealing ring, sliding bearing, screw rod set, piezoelectric stack electrode, piezoelectric stack, thrust bearing, mass block, screwdriver shell, reset spring；The present invention is using piezoelectric stack as driving source, piezoelectric stack is precision actuation element, the output displacement and output stress of piezoelectric stack are controlled by voltage of the load on piezoelectric stack electrode, high-precision screwdriver is using piezoelectric stack as driving source, it is displaced using the inverse piezoelectric effect of piezoelectric stack and the high resolution output of micron level, by changing voltage of the load on piezoelectric stack electrode, control the output displacement and stress of piezoelectric stack, screw rod will be exported with high-resolution displacement and the output stress of high-precision control, realize driver bit be screwed into the high-precision control of depth and improve screwdriver twist power control precision.

Description

A kind of high-precision screwdriver based on piezoelectric stack

Technical field

The present invention relates to a kind of high-precision screwdriver based on piezoelectric stack, belongs to a kind of screw tightening tool.

Background technique

In real life, screwdriver is very common and strong applicability, screwdriver are to twist screw to force it in place Or the tool offed normal.The characteristics of due to its function, is widely used in electronic apparatus, micromachine, computer, miniature clout The fields such as part.With the high speed development of science and technology, the installation accuracy requirement of components is higher and higher, is screwed into driver bit It is higher and higher that the control of depth and screwdriver twist power control accuracy requirement.Therefore how to improve driver bit is screwed into depth Control precision and screwdriver twist power control precision become screwdriver important development direction.

There are many current screwdriver type both domestic and external, and main screwdriver classification has the adjustable electric screw of cutter head angle Knife, Multifunctional combined screw-driver, wherein the adjustable electric screw driver of cutter head angle is in abnormal work, it can be achieved that work, It is convenient and practical；Multifunctional combined screw-driver can have a variety of different driver bit structures simultaneously, more meet people day Normal needs, structure is simple, easy to use.Above-mentioned screwdriver in terms of operational readiness and Multifunctional tool bit mainly from can be set Meter, can not improve that driver bit is screwed into the control precision of depth and screwdriver twists power control precision.

It finds by prior art documents, from Suzhou, Ying get Fu Electromechanical Technology Co., Ltd is write " more Function combination screw driver " Multifunctional combined screw-driver that patent is mentioned, there can be a variety of different screwdriver structures simultaneously, it is rich The rich function of screwdriver, structure is simple, easy to use, but the invention only increases different types of cutter head, does not mention High driver bit is screwed into the control precision of depth and screwdriver twists power control precision.Advance welding material for Chongqing City Jiangjin District " a kind of transmission device of the adjustable electric screw driver of cutter head angle " patent that material factory writes refers to the cutter head of electric screw driver Adjustable angle allows electric screw driver to work in abnormal work, convenient and practical, but the invention only changes transmission Apparatus structure, there is no the control precision that inherently raising driver bit is screwed into depth.

Summary of the invention

In view of the above-mentioned deficiencies in the prior art, it is an object of the present invention to propose a kind of high-precision screw based on piezoelectric stack Knife, piezoelectric stack are precision actuation element, electricity of the output displacement and output stress of piezoelectric stack by load on piezoelectric stack Voltage-controlled system, high-precision screwdriver, as driving source, utilize the inverse piezoelectric effect and micron level of piezoelectric stack using piezoelectric stack High resolution output displacement, by changing voltage of the load on piezoelectric stack, controlling the output displacement of piezoelectric stack and answering Output stress with high-resolution displacement output and high-precision control is realized driver bit and is screwed into depth by power, screw rod High-precision control and improve screwdriver twist power control precision.

The present invention to achieve the goals above, adopts the following technical scheme that

A kind of high-precision screwdriver based on piezoelectric stack, it includes cutter head slot, screw rod, sealing ring, sliding bearing, screw rod Set, piezoelectric stack electrode, piezoelectric stack, thrust bearing, mass block, screwdriver shell, reset spring；

The screw rod is located in screw rod set；The screw rod and screw rod set are cooperated the screw for realizing screw rod, Screw rod and thrust bearing joint are for transmitting displacement simultaneously；

One end of screw rod is in contact with thrust bearing, and the other end of screw rod is provided with cutter head slot, and respective center line is same On axis；

The outer ring of sealing ring matches sealing with screw rod set, and the inner ring of sealing ring matches sealing with screw rod；

The outer ring of sliding bearing matches with screw rod set and contacts, the inner ring of sliding bearing and screw rod with merge sliding bearing its It is close to sealing ring in side；

The outer ring of the sealing ring cooperates with screw rod set, and the inner ring and screw rod of sealing ring are cooperated so that screw rod covers interior cloth Lubricating oil do not leak；

The outer ring of the sliding bearing and screw rod set cooperate, and the inner ring of sliding bearing is close to screw rod with its side of merging close Seal so that screw rod spin move when frictional resistance greatly reduce, move it is smooth；

The both ends of piezoelectric stack are separately fixed on screwdriver shell on mass block, and piezo stack is provided on piezoelectric stack Heap electrode；Power source as entire screwdriver；

Two thrust bearings are separately fixed at the center of mass block both ends of the surface, the other end and screw rod end face of thrust bearing Contact；It is displaced for transmitting；

The both ends of the surface of mass block are contacted with piezoelectric stack, reset spring respectively；

The both ends of reset spring be separately fixed on screwdriver shell and mass block end face on；Make mass block in piezoelectric stack Initial position is restored to when removing on-load voltage；

Further, the cutter head slot is square slot or diamond shape slot.For the insertion of different type cutter head, realize different The screw of type is in place and the function offed normal；

Further, screw rod applies screw and is fixed on screwdriver shell, and respectively with sealing ring, sliding bearing, screw rod into Row is cooperatively connected, and the center line of sealing ring, sliding bearing, screw rod, screw rod set, screwdriver shell is on the same line.

The working principle of the invention is: when loading certain voltage to two piezoelectric stack electrodes, according to piezoelectric stack Inverse piezoelectric effect, two piezoelectric stacks simultaneously output displacement and stress, piezoelectric stack push mass block move right, pass through thrust Bearing (the right) pushes the screw rod on the right to move right, and screw rod is under the mating reaction that screw rod covers, and the screw rod on the right is not only to the right It is mobile, be formed simultaneously rotary motion, after cutter head slot on the right loads onto different types of cutter head, the screw rod on the right just have by Screw function in place makes piezoelectric stack export different displacements by changing voltage of the load on piezoelectric stack electrode And stress, it realizes that driver bit is screwed into the high-precision control of depth and improves screwdriver and twists power control precision；With this Meanwhile the screw rod on the left side moves right, screw rod is under the mating reaction that screw rod covers, and the screw rod on the left side not only moves right, simultaneously Rotary motion is formed, after the edge of a knife slot when the left side loads onto different types of cutter head, the screw rod on the left side, which just has, offs normal screw Function.Load is removed in the voltage of piezoelectric stack, under the return spring force effect of reset spring, mass block returns to initial bit It sets.

Beneficial effects of the present invention:

For the present invention using piezoelectric stack as driving source, piezoelectric stack is precision actuation element, the output bit of piezoelectric stack It moves and output stress is controlled by voltage of the load on piezoelectric stack electrode, high-precision screwdriver is using piezoelectric stack as driving Source is displaced using the inverse piezoelectric effect of piezoelectric stack and the high resolution output of micron level, by changing load in piezo stack Voltage on heap electrode, controls the output displacement and stress of piezoelectric stack, and screw rod will have high-resolution displacement output and high-precision The output stress for spending control realizes driver bit and is screwed into the high-precision control of depth and improves screwdriver and twists power control Precision processed.

Detailed description of the invention

Fig. 1 is overall structure central axis sectional view of the invention

Specific embodiment

In order to understand that technical solution of the present invention and advantage more clearly, with reference to the accompanying drawing to implementation of the invention Example elaborates: the present embodiment is implemented under the premise of the technical scheme of the present invention, gives detailed embodiment With specific operating process, but protection scope of the present invention is not limited to following embodiments.

The high-precision screwdriver includes including 11 main cloth member compositions: cutter head slot 1, screw rod 2, sealing ring 3, sliding axle It holds 4, screw rod and covers 5, piezoelectric stack electrode 6, piezoelectric stack 7, thrust bearing 8, mass block 9, screwdriver shell 10, reset spring 11。

The cutter head slot 1 is square slot, for the insertion of different type cutter head, realize different types of screw in place and The function of offing normal.

Screw rod 2 and screw rod set 5 are cooperated the screw for realizing screw rod, while screw rod 2 connects with thrust bearing 8 Touching, respective center line on the same axis, are displaced for transmitting.

5 cooperation of the outer ring of sealing ring 3 and screw rod set, the inner ring and screw rod 2 of sealing ring 3 are cooperated so that in screw rod set 5 The lubricating oil of cloth does not leak.

5 cooperation of the outer ring of sliding bearing 4 and screw rod set, the inner ring of sliding bearing 4 are close to screw rod 2 with its side of merging close Seal so that screw rod 2 spin move when frictional resistance greatly reduce, move it is smooth.

Screw rod set 5 is screwed in screwdriver shell 10, and is matched respectively with sealing ring 3, sliding bearing 4, screw rod 2 It closes, and the center line of each cloth member is on the same line.

The both ends of piezoelectric stack 7 be separately fixed on screwdriver shell 10 and mass block 9 on, as the dynamic of entire screwdriver Power source.

Two thrust bearings 8 are separately fixed at the center of 9 both ends of the surface of mass block, the other end of thrust bearing 8 and screw rod 2 End face contact, for transmitting displacement.

The both ends of the surface of mass block 9 are contacted with piezoelectric stack 7, reset spring 11 respectively.

Screwdriver shell 10 is the main body of entire high-precision screwdriver, two screw rods sets 5 be screwed respectively its two End face.

The both ends of reset spring 11 are separately fixed on screwdriver shell on 10 and 9 end face of mass block, are pressing mass block 9 Electricity stacks 7 when removing on-load voltage and is restored to initial position.

The working principle of the invention is: when loading certain voltage to two piezoelectric stack electrodes 6, according to piezoelectric stack 7 inverse piezoelectric effect, output displacement and stress, piezoelectric stack 7 push mass block 9 to move right, pass through two piezoelectric stacks 7 simultaneously The thrust bearing 8 on the right pushes the screw rod 2 on the right to move right, and screw rod 2 is under the mating reaction of screw rod set 5, the screw rod 2 on the right It not only moves right, is formed simultaneously rotary motion, after cutter head slot 1 on the right loads onto different types of cutter head, the spiral shell on the right Bar 2 just has the function that screw is in place, by changing voltage of the load on piezoelectric stack electrode 6, keeps piezoelectric stack 7 defeated Different displacements and stress out realize that driver bit is screwed into the high-precision control of depth and improves screwdriver and twist power control Precision processed；At the same time, the screw rod 2 on the left side moves right, and screw rod 2 is under the mating reaction of screw rod set 5, and the screw rod 2 on the left side is not It only moves right, is formed simultaneously rotary motion, after the edge of a knife slot 1 when the left side loads onto different types of cutter head, the screw rod 2 on the left side is just With the function that screw is offed normal.Load is removed in the voltage of piezoelectric stack electrode 6, in the return spring force of reset spring 11 Under effect, mass block 9 returns to initial position.

The invention can define the different output displacements that different voltage corresponds to piezoelectric stack by way of experiment, real The high-precision control that driver bit is screwed into depth is showed.

As shown in the table, in experiment piezoelectric stack on-load voltage and output displacement relationship；

The relationship of piezoelectric stack on-load voltage and output displacement:

Voltage (V)	10	30	50	70
					Displacement (10-6M)	0.83	2.48	4.13	5.78

Claims (3)

1. A high-precision screwdriver based on a piezoelectric stack, characterized in that it comprises a cutter head groove (1), a screw (2), a sealing ring (3), a sliding bearing (4), a screw sleeve (5), Piezoelectric stack electrode (6), piezoelectric stack (7), thrust bearing (8), mass block (9), screwdriver housing (10), return spring (11); The screw (2) is located in the screw sleeve (5); One end of the screw (2) is in contact with the thrust bearing (8), the other end of the screw (2) is provided with a cutter head groove (1), the center of the screw (2), the thrust bearing (8) and the cutter head groove (1) lines are on the same axis; The outer ring of the sealing ring (3) is matched with the screw sleeve (5) for sealing, and the inner ring of the sealing ring (3) is matched with the screw (2) for sealing; The outer ring of the sliding bearing (4) is in contact with the screw sleeve (5), the inner ring of the sliding bearing (4) is matched with the screw (2), and the side of the sliding bearing (4) is close to the sealing ring (3); Two ends of the piezoelectric stack (7) are respectively fixed on the screwdriver housing (10) and the mass block (9), and piezoelectric stack electrodes (6) are arranged on the piezoelectric stack (7); The two thrust bearings (8) are respectively fixed at the center of the two end faces of the mass block (9), and the other end face of the thrust bearing (8) is in contact with the end face of the screw rod (2); The two end faces of the mass block (9) are respectively in contact with the piezoelectric stack (7) and the return spring (11); Both ends of the return spring (11) are respectively fixed on the screwdriver housing (10) and the end surface of the mass block (9). 2 . The piezoelectric stack-based high-precision screwdriver according to claim 1 , wherein the cutter head slot ( 1 ) is a diamond-shaped slot. 3 . 3. The piezoelectric stack-based high-precision screwdriver according to claim 1, characterized in that: the screw sleeve (5) is fixed on the screwdriver housing (10) with screws, and is respectively connected with the sealing ring (3), the sliding bearing (4) The screw (2) is matched and connected, and the centerlines of the sealing ring (3), the sliding bearing (4), the screw (2), the screw sleeve (5), and the screwdriver housing (10) are on the same straight line.