CN202329965U

CN202329965U - Detection device for brake caliper cells

Info

Publication number: CN202329965U
Application number: CN2011204474460U
Authority: CN
Inventors: 何晓博
Original assignee: Tokico Ltd
Current assignee: Tokico Ltd
Priority date: 2011-11-14
Filing date: 2011-11-14
Publication date: 2012-07-11
Anticipated expiration: 2021-11-14

Abstract

A detection device for brake caliper cells replaces the conventional vertical compression detection device through adopting an ultrahigh pressure differential pressure type sensing device with better detection ability in a production line in high-speed operation and under the premise of meeting the test condition of 7MPa required by customers. Aiming to overcome the deficiencies of the conventional detection method that the detection precision and the detection ability are poor and achieve the accuracy that the maximum relative pressure is 0.25% plus or minus 1 digit or -0.25% plus or minus 1 digit, and the minimum display is 0.1 KPa, the utility model provides an on-line batch quick detection device, which can meet the requirement of on-line batch application of brakes, is high in detection precision and detection ability, and can meet the customer demand to the utmost extent as the testing condition is in accordance with an assembly plant.

Description

A kind of caliper nest hole pick-up unit

Technical field

The utility model relates to the pick-up unit technical field, especially a kind of caliper nest hole pick-up unit.

Background technology

At present, the auto parts and components industry has two kinds to detent foundry goods nest hole device technique commonly used;

First kind is that line carries out x-ray detection inspection or permeates cut sections for microscopic examination to portion's article in proportion outward, because time relationship and certain destructiveness is arranged is tested so inspect by random samples.

Second kind is the Hi-pot test with 4MPa, although accuracy of detection increases, the actual hydraulic pressure of assembly plant is 7MPa.

And existing TSL uses is that capable on-line testing is compressed in the test of 7MPa, but accuracy of detection is low.Also can't 100% detect small nest hole.

Summary of the invention

The utility model technical matters to be solved is to have overcome the shortcoming of background technology.

In order to solve the problems of the technologies described above; The technical scheme that the utility model adopts is: a kind of caliper nest hole pick-up unit; In the production line that runs up; Test condition with the 7MPa that meets customer need is a prerequisite, utilizes the better superhigh pressure difference pressure type of detectability sensing apparatus to replace vertical compression pick-up unit in the past.

The beneficial effect of the utility model is: for accuracy of detection and the low deficiency of detectability that overcomes conventional detection; Realize its precision be maximal phase to press ± 0.25% ± 1digit. minimum be shown as 0.1KPa. the utility model provide a kind of promptly can online batch device for fast detecting; This pick-up unit not only can satisfy the online batch of detent and be suitable for, and accuracy of detection and detectability are higher.Test condition is consistent with car load factory, promptly can meet customer need to greatest extent.

Description of drawings

Accompanying drawing is the principle schematic of the utility model.

Embodiment

Below in conjunction with accompanying drawing and specific embodiment the utility model is done further explain:

Shown in accompanying drawing; The utility model caliper nest hole pick-up unit; In the production line that runs up, be prerequisite with the test condition of the 7MPa that meets customer need, utilize the better superhigh pressure difference pressure type of detectability sensing apparatus to replace vertical compression pick-up unit in the past.

The principle of work of the utility model is: the vertical compression method of testing is with after applying certain malleation or negative pressure for tested article; Close external valve then; Measure through tensimeter or pressure transducer/pressure switch etc. and to reveal the pressure cause because of measured object and descend and since its detect mainly depend on product self reveal the pressure that produces with.So its test pressure scope is 1.5MPa, 4.9MPa, 10MPa; Several sections of 16MPa; Actual maximum pressure is that 15MPa. is the pressure transducer corresponding to the test pressure scope owing to what use, and rate descends along with the increase of pressure respectively, so the test sensitivity of amount of leakage has also just descended.The influence that risen by temperature is bigger, and degree of influence increases and the variation of temperature is relatively along with the size of pressure.In addition, so need the time of measuring that prolongs in case prolong owing to sensitivity is low, just shortened relatively the stabilization time of pressurizeing, thereby error is big.

And differential pressure test rule uses differential pressure meter (U-shaped pipe/differential pressure pick-up etc.) to replace traditional tensimeter, because the leakage of measured object can cause the decline of pressure, thereby and has produced differential pressure between the standard component.Promptly test out its internal pressure variation and judge whether leakage.Because its sensor internal has certain responsive foil gauge, so that method is not only tested the sensitivity height but also the reaction velocity of leakage is fast.But also be because its inner core component pressure sensing foil gauge than sensitivity and easy deformation and receive the influence of many factors such as influence of recovery capacity; Common this method usually is applicable to the low middle test of pressing; Be 0.2MPa-1MPa, 1.5MPa, be 4.9MPa. to the maximum and this TSL with the test of its Ying Yu in detent 7MPa; Simultaneously prolong the corresponding life-span, change the inlet flow rate that test is pressed in order to improve its confidence level.Thereby the withstand voltage properties of the foil gauge in the differential pressure pick-up promotes.And the error that the rising of temperature or variation are produced can be cancelled out each other because of having used standard items.Even it is also very high that the reason that resolution the is high time of measuring shortens detectability.

In addition, because the sealing article of workpiece to be tested can influence tested volume-variation for the recoverability of rubber articles event self is bigger.The influence of the high test pressure of the 7MPa of institute in addition.In the initial press stage, because the influence of disconnected thermal distortion or volume-variation can cause bigger pressure variation (error).Compare with relative pressure mode, the sensitivity of differential pressure test is high, can shorten the time of measuring.Like this, under test period certain situation (productive temp consideration), can set than relative pressure mode stabilization time more fully, thereby can reduce test error.

Overall detect to detent foundry goods impermeability, superhigh pressure difference pressure type detection method quote before the vertical compression method of testing, not only reaction velocity is fast but also power of test/confidence level/permanance/versatility all is greatly improved.Improve in precision under the necessary condition of bad outflow reduction, the utilization of robotization also makes the property more economically of stopping leakage in the roof in whole foundry goods nest hole.

Claims

1. a caliper nest hole pick-up unit is characterized in that, replaces the vertical compression pick-up unit with superhigh pressure difference pressure type sensing apparatus (1).