CN2767956Y - Device for measuring tin open impression remnant thickness - Google Patents

Abstract

The utility model provides a device for measuring tin open impression remnant thickness, which comprises two laser measurement units which are coaxially and oppositely installed on both sides of a cover of a measured tin, wherein each laser measurement unit has an automatic focusing function, and each laser measurement unit is composed of a laser, a spectroscopic plate, a focus adjustment object lens and a focus adjustment positioning photoelectric assembly, which form an optical path in sequence; each measurement unit is connected with a computer through a signal wire. The utility model has the advantages of low manufacture cost, good long-term operating stability, high measurement efficiency, convenient installation and debugging, and convenient operation and maintenance. The measuring device can be used for automatic detection field, such as opaque thin plate automatic detection, etc.

Description

POP can opening impression residual thickness measuring device

Technical field

The utility model belongs to the geometric measurement equipment technical field, specifically is meant a kind of POP can opening impression residual thickness measuring device.

Background technology

Open for ease of pop can, must stamp out on cover during production and open a mouthful vestige, the workplace of this vestige is a special-shaped profile, and wherein the residual thickness of opening impression is an important indicator of pop can production control.

The measuring method of POP can opening impression residual thickness mainly contains two kinds at present: a kind of is relative measurement method, promptly utilize the microscope that has the reading mechanism of focusing, respectively to recording depth of cup after cover surface and twice focusing of impression, deduct depth of cup with cover thickness again, can obtain the cover residual thickness, wherein cover thickness is to measure in advance.Another kind is the direct method of measurement, this method is placed the strong point that a hard material is made at the another side of corresponding pop can cover impression, first with the reading focusing microscope to strong point surface calibrate zero-bit, pop can cover measuring point is placed on this strong point, the focusing reading microscope can directly be measured POP can opening impression residual thickness again.The laser acquisition head that also has use to have automatic focusing function is measured, and its principle of work is identical with above-mentioned first kind of mensuration.

There is following problem in actual applications in prior art:

When adopting relative measurement method, because the pop can cover is subjected to the stamping press effect when being shaped, thickness is uneven often, and the cover thickness of measuring is a mean value in advance, there is some difference with near the impression actual (real) thickness, and this difference directly influences the result of calculation of residual thickness; When adopting the direct method of measurement, overcome the error that cover or sheet gauge inequality cause to a certain extent, the location of the strong point is cumbersome when still measuring; When needs were measured multiple spot, workload was big, inefficiency; All there is the low problem of repeatable accuracy in said method.

The utility model content

In order to solve above-mentioned the deficiencies in the prior art part, the purpose of this utility model provides a kind of efficient, accurate POP can opening impression residual thickness measuring device.

The purpose of this utility model is achieved through the following technical solutions: the measurement mechanism of this POP can opening impression residual thickness, comprise two coaxial laser measurement unit of installing in opposite directions with automatic focusing function that lay respectively at tested cover both sides, each unit is made up of the laser instrument that constitutes light path successively, beam-splitter, focusing object lens and focusing location photoelectric subassembly; Each measuring unit links to each other with computing machine by signal wire.

In order to realize the utility model better, described measurement mechanism also can comprise the bearing table that the one dimension that can place tested cover or bidimensional are adjusted; Described bearing table manually or is automatically adjusted.

Described two laser measurement unit can symmetry with respect to the cover plane also can be asymmetric; The focal length of described two focusing object lens can be the same or different.

The utility model compared with prior art has the following advantages and effect:

1, adopt the measuring basis that floats, measurement result and cover thickness do not have direct relation, have eliminated systematic error (or location gross error) effectively, can reach micron-sized measuring accuracy, so measurement result are reliable.

2, realize optical non-contact measurement on the complete meaning, be convenient to realize measuring robotization, the compensation that can use a computer of impression SHAPE DETECTION and displayed record, error.

3, mature photoelectricity locator meams is used for impression and detects, manufacturing cost is relatively low, and long-term working stability is good, and operation and maintenance is convenient.

When 4, use machine calculation machine is measured in real time, the efficiency of measurement height, Installation and Debugging are convenient.

5, easy to utilize in the robotization detection range of other opaque thin plates, depth of cup, fine shape etc.

Description of drawings

Fig. 1 is a schematic diagram of device of the present utility model.

Fig. 2 is the systematic schematic diagram of relative measurement method.

Fig. 3 is the systematic schematic diagram of the direct method of measurement.

Embodiment

Below in conjunction with embodiment and accompanying drawing the utility model is described in further detail, but embodiment of the present utility model is not limited thereto.

Fig. 2 is the systematic schematic diagram of relative measurement method.d ₀Be the cover of pop can average thickness, its value is measured by multi-point average in advance; Δ d is the degree of depth of POP can opening impression, and its value is recorded by the focusing reading microscope; The residual thickness δ of POP can opening impression is calculated by following formula:

δ＝d ₀-Δd (1)

Fig. 3 is the systematic schematic diagram of the direct method of measurement.During measurement, earlier by the focusing reading microscope to supporting the benchmark check for zero, the pop can cover is positioned over supports on the benchmark again, then can be directly from the residual thickness value δ of focusing reading microscope acquisition POP can opening impression.

As shown in Figure 1, POP can opening impression residual thickness measuring device is made of laser measurement unit A and laser measurement unit B, and laser measurement unit A is made up of laser instrument 1, beam-splitter 2, focusing object lens 3, focusing location photoelectric subassembly 4; The laser measurement unit B is made up of laser instrument 9, beam-splitter 7, focusing object lens 6, focusing location photoelectric subassembly 8, and two laser measurement unit also are connected with computing machine by signal wire respectively, and tested cover 5 is positioned on the bearing table 10.Relatively independent on laser measurement unit A and the laser measurement unit B structure, two focusing object lens are installed in opposite directions and with optical axis.

This measurement mechanism is measured the measuring method of POP can opening impression residual thickness: laser measurement unit A measures as follows in measuring process, the light that laser instrument 1 sends forms a hot spot on tested cover 5 surfaces behind beam-splitter 2 and focusing object lens 3, hot spot place reflected light is through being incident upon behind focusing object lens 3 and the beam-splitter 2 on the photoelectric subassembly 4 of focusing location, when focus during on tested cover 5 surfaces, focusing location photoelectric subassembly 4 does not have the output of focusing signal, but when out of focus, photoelectric subassembly 4 focusing signals in focusing location are imported specific driving circuit of the prior art and are driven focusing object lens 3 and move, and this moment is with driving voltage (electric current) value u ₁Be sent to computing machine, computing machine is handled behind the measuring-signal that receives from laser measurement unit A, by formula (6) the back focusing object lens 3 displacement x that can obtain focusing ₁The measuring method of laser measurement unit B is same as described above, and computing machine is handled behind the measuring-signal that receives from the laser measurement unit B, equally by formula (6) the back focusing object lens 6 displacement x that can obtain focusing ₂At last, can calculate POP can opening impression residual thickness δ according to formula (5).

Measuring principle of the present utility model is: on corresponding cover of pop can two surfaces, a cover laser measurement unit is installed respectively, the also same in opposite directions optical axis of two focusing object lens is supposed the relative initial distance (position) of Unit two focusing object lens

l ₀＝f ₁+f ₂+t ₀ (2)

In the formula: f ₁Be the focal length of focusing object lens 3, f ₂Be the focal length of focusing object lens 6, t ₀Be a standard thickness, can determine that numerical value is chosen approaching with cover thickness as far as possible by feeler gauge or other benchmark.For example, t ₀Equal cover thickness.

When measuring tested POP can opening impression thickness, promptly as the residual thickness δ replacement t that uses impression ₀The time, the relative distance (position) of Unit two focusing this moment object lens is

l＝f ₁+f ₂+δ (3)

Formula (2)-(3) then have:

l ₀-l＝t ₀-δ (4)

L in the formula ₀-l=x ₁+ x ₂, x ₁, x ₂Be respectively the displacement of focusing back focusing object lens 3, focusing object lens 6 relative initial positions.

So can draw the measurement formula:

δ＝t ₀-x ₁-x ₂ (5)

In the formula,

$\left\{\begin{array}{c}{x}_1=f\left(u_1\right)\\ x_2=f\left(u_2\right)\end{array}\right.---\left(6\right)$

(6) formula shows, x ₁And x ₂Be respectively u ₁And u ₂Function, relational expression can be on specific reading calibration console, draw u by the method match of demarcating in advance ₁And u ₂Magnitude of voltage for the focusing driving circuit.

As mentioned above, can realize the utility model preferably.

Claims (5)

1, a kind of measurement mechanism of POP can opening impression residual thickness, it is characterized in that, it comprises two coaxial laser measurement unit of installing in opposite directions with automatic focusing function that lay respectively at tested cover both sides, and each unit is made up of the laser instrument that constitutes light path successively, beam-splitter, focusing object lens and focusing location photoelectric subassembly; Each measuring unit links to each other with computing machine by signal wire.

2, measurement mechanism according to claim 1 is characterized in that, described measurement mechanism comprises the bearing table that the one dimension that can place tested cover or bidimensional are adjusted.

3, measurement mechanism according to claim 2 is characterized in that, described bearing table manually or is automatically adjusted.

4, measurement mechanism according to claim 1 is characterized in that, described two laser measurement unit are with respect to cover plane symmetry or asymmetric.

5, measurement mechanism according to claim 4 is characterized in that, the focal length of described two focusing object lens is identical or different.

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