Elastic arm loading force measuring system
Technical field
The utility model relates to a kind of measuring system, relates in particular to a kind of elastic arm loading force measuring system, is specifically related to a kind of measuring system that is used to measure the loading force of hard disc magnetic head elastic arm.
Background technology
Elastic arm (Suspension) is one of vital part of hard disk drive core component (read-write head assembly), it is by three or four stainless steel substrates and order wire circuit, cantilevered support structure by laser bonding is formed can obtain its desired power, static attitude and frequency response characteristic under stress state to its moulding in advance, bending and adjustment.Read-write head (Slider) high-speed flight on magnetic recording disc during hard disk drive work, the surface configuration of its particular design plays the effect of air bearing, produces the buoyancy that breaks away from disc; The power that elastic arm produces under stress state (Gram Load) acts on the read/write head by universal joint (Dimple), make it keep stable flying height (Fly Height) and flight attitude (Attitude), thereby ensure read-write sensitivity and the stability of the sensor of read/write head front end magnetic recording signal on the disc.
High speed development along with the hard disk drive technology, storage track density and bit density improve constantly, not only require sensor to have littler size and stronger induction sensitivity, also require the flying height of read-write head lower (less than 15nm), the bearing accuracy of read-write head is higher (to comprise the bearing clearance, what temperature effect and resonance caused departs from), this has proposed higher challenge to the performance of key components and parts wherein.The tolerance control of elastic arm loading force is also more and more stricter.Its control tolerance is since two thousand two less than five years, and loading force control tolerance reduces to ± 0.125g from ± 0.2g, reduces to ± 0.1g again, and some client's product tolerance is reduced to ± 0.06g recently.This just has higher requirement to stability, the reliability of measuring system.The used loading force measuring equipment of each hard disk elastic arm manufacturer can only carry out single measurement to elastic arm at present, and low, the complex operation of efficient can only carry out inspecting by random samples before the shipment to the elastic arm of producing in batches, can't control effectively to production run.
Summary of the invention
Technical problem to be solved in the utility model is to provide a kind of elastic arm loading force measuring system, and to be clipped in measuring system efficient low excessively to overcome in the prior art elastic arm, the shortcoming that can not carry out on-line monitoring to production run.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of elastic arm loading force measuring system, the elastic force that is used for when measured zone is in the regulation attitude to elastic arm is measured, and comprising: the pay-off that is used for elastic arm is transported to measured zone; Be used for locating device that the elastic arm to be measured of sending into measured zone is positioned; Be used for clamp device with the elastic arm clamping to be measured behind the location; Be used for the device of lifting with elastic arm front end to be measured lifting; Be used for elastic force measurement mechanism that the elastic force of elastic arm to be measured is measured, described elastic force measurement mechanism comprises measuring head; Control pay-off, clamp device, lift the control module of part collaborative works such as device, instrumentation amount device; Also comprise image in the real-time collection measured zone, and with the image acquisition units of described image by control module control elastic force measurement mechanism adjustment measuring head position, described image acquisition units is electrically connected with control module.
Further, described image acquisition units comprises two cameras; Described camera is all aimed at measured zone, and the shooting direction of two cameras is mutually perpendicular.
Further, described image acquisition units also is included as the led light source that camera provides illumination.
In the optimized technical scheme, described clamp device comprises: the clamping head that contacts with elastic arm to be measured and cooperate locating device that elastic arm to be measured is clamped; Measure the sensor of clamping force size; Under the control of control module, stretch out or the clamping motor of its output shaft of withdrawing; And the fastening spring that connects the output shaft of clamping head and described clamping motor; Clamping motor is electrically connected with control module; Described force transducer is electrically connected with control module, and is arranged in the transfer route of the snap-in force between clamping motor and the clamping head.
Further in the optimized technical scheme, described clamping head also comprises universal joint.
Further, describedly lift the device of lifting that device is a contact, the described device of lifting is included in control module control motion down, and the direct trailing arm of contact measured elastic arm.
Further, the described device of lifting also comprises with described trailing arm and stretching out, and stretches into the alignment hole on the elastic arm to be measured before trailing arm is lifted elastic arm to be measured, makes to lift the alignment finger that device and elastic arm to be measured align; Described alignment finger is fixedly installed on the trailing arm.
Further, the described device of lifting also can be the contactless device of lifting, and the described device of lifting is included in the nozzle that the following injection of control module control pressurized air stream is lifted elastic arm to be measured.
Further, the described device of lifting also is included in the alignment hole that stretches into before the nozzle ejection pressurized air stream on the elastic arm to be measured, makes to lift the alignment finger that device and elastic arm to be measured align.
The utility model compared with prior art has following beneficial effect:
Owing to be provided with the image that image acquisition units is gathered measured zone, control module can obtain necessary parameter from image, be used to control the elastic force measurement mechanism and carry out corresponding actions, real-time monitoring and adjustment that realization is measured loading force, thereby improved efficient, can carry out on-line monitoring production run.In addition, the image of collection can show after amplifying, and is convenient to the operator measured zone is carried out minute observation.
Because image acquisition units has comprised the mutually perpendicular camera of individual shooting direction, the image information that is obtained more helps control system and makes judgement accurately.
Because also being provided with light source provides illumination for camera, makes the work of loading force measuring system need not rely on surround lighting; The more important thing is not can be because of the change of environmental light brightness, colour temperature etc., and influences the quality of camera institute images acquired.
Because light source is led light source, its luminescence efficiency height, life-span are long, and its light monochromaticity of sending is good, is particularly suitable as the lighting source of image acquisition units in the precision equipment.
Because clamp device is a power closed-loop control clamp device, can record clamping force by force transducer, control module is according to the clamping force that records then, the output shaft of control clamping motor stretches out or withdraws, change the decrement of fastening spring, thereby the adjusting clamping force finally obtains point-device clamping force, eliminates the measured value skew that causes because of clamping force is different.
Because folder strength also further comprises universal joint, makes clamping force can be evenly distributed on clamping head and the contacted clamping surface of elastic arm, therefore clamp better effects if.
Because adopted the device of lifting of contact, elastic arm can be kept stable attitude after holding up.
Owing to adopted the contactless device of lifting, when lifting and elastic arm contactless, thereby can not damage elastic arm.
Owing to further be provided with alignment finger on the device lifting, feasiblely earlier before lifting device elastic arm is lifted lift device and elastic arm aligns, thereby can more accurate assurance lift effect.
Description of drawings
Fig. 1 is the synoptic diagram of the utility model embodiment elastic arm loading force measuring system;
Fig. 2 is the enlarged drawing of a-quadrant among Fig. 1;
Fig. 3 is clamp device and the contactless schematic representation of apparatus of lifting in the utility model embodiment;
Fig. 4 is that contact is lifted schematic representation of apparatus in the utility model embodiment;
Fig. 5 is the workflow diagram of the utility model embodiment elastic arm loading force measuring system.
Embodiment
As shown in Figure 1, the elastic arm loading force measuring system of this embodiment, the cantilever end that is used to measure the elastic arm 9 on the hard disk bends to the elastic force of assigned address.This elastic arm loading force measuring system comprises: pay-off 1, locating device 2, clamp device 3, lift device 4, elastic force measurement mechanism 5, image acquisition units 6 and control module (control module does not draw in the drawings).
Pay-off 1 is used for the conveying of elastic arm 9, and it is sent into measuring position shown in Figure 28 with elastic arm 9 in order successively along directions X and measures.The elastic arm 9 that is positioned at measuring position 8 is called elastic arm 9 to be measured in this article especially.
Locating device 2 is used for elastic arm to be measured 9 location to sending into measuring position 8.
Clamp device 3 elastic arm 9 to be measured send into put in place after, elastic arm 9 is upwards withstood on the bottom of locating device 2.The clamp device 3 of this embodiment is a power closed-loop control clamp device, and as shown in Figure 2, it comprises clamping head 13, force transducer 10, fastening spring 12 and clamping motor 11 successively.One end of fastening spring 12 is fixedlyed connected with the output shaft of clamping motor 11, and its other end is fixedlyed connected with the bottom of force transducer 10.Clamping head 13 is fixedly installed on the upper surface of force transducer 10.When elastic arm 9 is sent into measuring position 8 by pay-off 1, and process locating device 2 is after the directions X location, clamping motor 11 moves under the control of control module, and its output shaft upwards (Z direction) stretches out, and finally by clamping head 13 bottom that elastic arm 9 withstands on locating device 2 is clamped.This moment, holddown spring 12 was compressed, and the pressure that force transducer 10 records passes to control module.The pressure that control module records according to force transducer 10, judge whether clamping force is within the normal range, if depart from normal value, the output shaft of then controlling clamping motor 11 stretches out or withdraws, to adjust the decrement of fastening spring 12, promptly can revise clamping force, with this realizable force closed-loop control, obtain more accurate clamping force, thereby avoid being offset because of the different measured values that cause of clamping force.Need be pointed out that further that as shown in Figure 3, the clamping head 13 of clamp device 3 comprises universal joint 14, make clamping force to be distributed to uniformly on the surface of contact between clamping head 13 and the elastic arm 9 by the adaptivity of universal joint 14.
Lift device 4 and be positioned at the below of elastic arm 9 front ends to be measured, the front end lifting that it is used for elastic arm 9 makes measurement point on the elastic arm 9 be higher than measuring head 15 on the elastic force measurement mechanism 5; And after the loading force measuring system is ready, discharges elastic arm 9 its front end is fallen because of elasticity.9 times backwardnesss of elastic arm, thereon measurement point of position acts on the measuring head 15 of elastic force measurement mechanism 5, and then the elastic force that elastic arm 9 is in this posture is promptly recorded by elastic force measurement mechanism 5.Lifting device 4 can be contact, also can be contactless.Contact lift device 4 as shown in Figure 4, it is by direct contact resilient arm 9 of trailing arm and with its front end lifting.The advantage that contact is lifted device 4 is that elastic arm 9 is held up the back attitude stabilization; Shortcoming is because there is contact, may damage elastic arm 9.And contactless lift device 4 referring to Fig. 3, it lifts elastic arm 9 by air current spray nozzle ejection pressurized air stream.Contactless advantage of lifting device 4 is contactless with elastic arm 9, thereby can not cause damage to elastic arm 9; Shortcoming is to cause the vibration of elastic arm 9 easily because air-flow is unstable.The device of lifting of this embodiment also comprises alignment finger.After lifting device 4 actions, the conical head of alignment finger end at first enters the alignment hole on the elastic arm 9, because the automatic capturing characteristic of conical head, and make that lifting device 4 aligns with elastic arm 9; Lift device 4 after aligning and just lift elastic arm 9, perhaps lift elastic arm 9 by air current spray nozzle ejection pressurized air stream by trailing arm.
Elastic force measurement mechanism 5 also is positioned at the below of elastic arm 9 front ends to be measured, measuring head 15 on it faces the measurement point on the elastic arm 9, and elastic force measurement mechanism 5 is electrically connected with control module, not only the elastic force that records control module can be transferred to, the position of measuring head 15 can also be under the control of control module, adjusted.
Image acquisition units 6 is electrically connected with control module, be used for regional 8 elastic arms, 9 measurement points to be measured and near image thereof are gathered in real time, give control module with the image transfer that collects, and control module is arranged based on the image that collects, elastic arm loading force test process is carried out the real-time closed-loop monitoring.As seen from Figure 1, the image acquisition units 6 in this embodiment specifically comprises two cameras, and two cameras all aim to be measured regional 8; And one of them takes a crane shot to measuring position 8 from vertical direction, and another one is from taking the side of elastic arm 9 to be measured against the directions X level.Two cameras all are electrically connected with control module, give control module with the image data transmission that photographs.Control module carries out analyzing and processing to the view data that is collected, and controls elastic force measurement mechanism 5 action then, adjusts the position of measuring head 15 on it, realizes closed-loop control based on image with this.The loading force measuring system of this embodiment has carried lighting source and has cooperated camera work, reduces the influence of external environment to image acquisition units 6.Lighting source particularly is a led light source.
Pay-off 1, clamp device 3, lift part such as device 4, elastic force measurement mechanism 5 and all be electrically connected with control module, the surveying work of elastic arm loading force is carried out in concerted action under the control of control module.Its concrete workflow is as shown in Figure 5: the first step, the operator puts into frock with elastic arm 9, is about to a plurality of elastic arms 9 and arranges and be positioned on the pay-off 1, finishes the material preparation process.In second step, pay-off 1 moves under the control of control module, and elastic arm 9 is sent into measuring position 8 in order successively.The 3rd step, 2 pairs of elastic arms to be measured of locating device, 9 location, clamp device 3 clamps elastic arm 9 to be measured.The 4th step, lift device 4 action, the front end of elastic arm 9 to be measured is raised to suitable height.In the 5th step, the measuring head 15 of control module control elastic force measurement mechanism 5 moves to the measuring position.In the 6th step, control module is gathered the image of measured zone 8 by image acquisition units 6, and measuring head 15 mobile carried out closed-loop control.If the 5th step was then returned in the position deviation measuring position of measuring head 15,5 actions of control module control elastic force measurement mechanism are from the position of new adjustment measuring head 15.If measuring head 15 accurately arrives the measuring position, then carried out for the 7th step.In the 7th step, carry out the elastic arm loading force and measure.After measurement was finished, the elastic arm 9 that pay-off 1 will be measured was removed, and simultaneously next elastic arm 9 was sent to measured zone 8.Promptly had to be measured elastic arm 9 in place if control module is judged in the measured zone 8 by image acquisition units 6 material is arranged this moment, then returned for the 3rd step, carries out next one and measure and circulate.If judging in the measured zone 8 does not have material, promptly there has not been elastic arm 9 to be measured, then control elastic force measurement mechanism 5 and withdraw from the measuring position, return the first step then, wait for that the operator puts into frock with elastic arm 9.
Above content be in conjunction with concrete preferred implementation to further describing that the utility model is done, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, under the prerequisite that does not break away from the utility model design, can also make some simple deduction or replace, all should be considered as belonging to protection domain of the present utility model.