CN101131368A - Automatic foreign matter inspection machine with dual optical signal receiving sensor array structure - Google Patents

Abstract

The invention discloses an automatic foreign matter inspection machine with a double optical signal receiving sensor array structure, which is sequentially equipped with a light emitting tube assembly, a light emitting light collecting mirror, a light receiving light collecting mirror, an imaging mirror, a first light receiving Sensor array, the container containing the liquid to be tested is placed on the intermittent rotating body between the light-emitting light-collecting mirror and the light-receiving light-collecting mirror. The feature is that a beam splitter is added between the imaging mirror and the first light bar; The spectroscopic mirror is divided into direct and reflective parts, the direct part of light is received by the first light receiving sensor array, and the reflected part is received by the second light receiving sensor array, forming a dual light receiving sensor array structure to detect foreign objects. The dual light receiving sensor array structure is adopted, and a light barrier is set in front of the two light receiving sensor arrays. The same light receiving sensor array device is selected and installed in a misplaced position to ensure that all optical signals are received without omission. Occurrence of foreign matter missed detection, set the slit diaphragm, improve the signal-to-noise ratio and sensitivity of the system.

Description

Automatic foreign matter inspection machine with dual optical signal receiving sensor array structure

technical field

The invention relates to a fully automatic on-line detection device for quality detection of liquid products such as transparent or translucent oral liquids, ampoules and infusion bottles on a pharmaceutical production line, in particular to an automatic foreign matter inspection machine with a dual optical signal receiving sensor array structure .

Background technique

The automatic foreign matter inspection machine is a fully automatic online inspection device for quality inspection of liquid products such as transparent or translucent oral liquids, ampoules, and infusion bottles on the pharmaceutical production line. The use of photosensitive tube arrays as optical signal receiving elements is a commonly used structural method. However, the photosensitive tube array device is composed of dozens of photosensitive tubes, and there is an insensitive area (blind area) between the photosensitive tubes. The existence of the insensitive area causes the omission of detection of foreign objects and reduces the detection efficiency.

Contents of the invention

In order to overcome the shortcomings of the existing automatic foreign object inspection machine due to the existence of the photosensitive tube array as the insensitive area of the optical signal receiving element, which causes the omission of detection of foreign objects and the decrease in detection efficiency, the present invention provides a dual optical signal receiving sensor array. Array structure automatic foreign matter inspection machine.

The technical solution of the present invention is an automatic foreign matter inspection machine with a dual optical signal receiving sensor array structure, which is equipped with a light-emitting tube assembly, a light-emitting light-collecting mirror, a light-receiving light-collecting mirror, and an imaging mirror in sequence from left to right. 1. The first light-receiving sensor array, the sealed container of transparent or translucent liquid containing the liquid to be tested is placed on the intermittent rotating body between the light-emitting light-collecting mirror and the light-receiving light-collecting mirror, and its characteristics are:

A. There is a first light bar in front of the first photoreceiving sensor array;

B. be provided with 45 degree semi-reflection and semi-transmission beam splitters or beam splitting cube prism between described imaging mirror and the first diaphragm;

C. The light beam emitted by the luminescent tube assembly is formed into a parallel beam through the light-emitting light-collecting mirror, and the parallel light beam passes through the intermittently rotating transparent or translucent liquid sealed container containing the liquid to be tested, and enters the light-receiving light-collecting mirror The imaging mirror forms the imaging beam of the solution area in the container to be detected. The imaging beam is divided into direct and reflection parts by a 45-degree semi-reflective semi-transmissive beam splitter or a beam-splitting cube prism. A second light receiving sensor is added on the reflected light path. Array, in front of the second light-receiving sensor array, there is a second light bar; the light beam emitted by the light-emitting tube assembly forms a parallel light beam through the light-emitting light-collecting mirror, and forms an imaging beam of the solution area in the detected container through the imaging mirror The direct part of the imaging beam reaches the first light-receiving sensor array through the first light barrier, and the reflected part of the imaging beam passes through the second light barrier to the second light-receiving sensor array, forming a double light-receiving sensor array structure to detect the liquid in the container. foreign body.

The first and second light-receiving sensor array devices are selected from the same device, and when the two light-receiving sensor arrays are installed, there is a misalignment in the vertical position, and the distance of the misalignment is equal to that of adjacent light-receiving sensor arrays. Half the distance between the centers of the two photosensitive tubes.

The beneficial effect of the present invention is that, due to the adoption of the dual light receiving sensor array structure, a slit light bar is set in front of the two light receiving sensor arrays, which improves the signal-to-noise ratio and enables the selection of the two light receiving sensor array devices. The same device has a misalignment in the vertical position during installation, and the misalignment distance is half of the interval between two adjacent photosensitive tubes in the light-receiving sensor array, eliminating the existence of the insensitive area of the existing single light-receiving sensor array Caused the omission detection to foreign matter, and the shortcoming of low detection efficiency.

Description of drawings

Fig. 1 is an optical path diagram of an automatic foreign matter inspection machine with a dual optical signal receiving sensor array structure;

Fig. 2 is a structural diagram of an automatic foreign matter inspection machine with a dual optical signal receiving sensor array structure;

Fig. 3 is the distribution schematic diagram of light-receiving sensor array photosensitive surface and blind area;

4 is a schematic diagram of the distribution of all optical signals on the imaging surface;

5 is a schematic diagram of the distribution of light signals on the photosensitive area and blind area on the first light receiving sensor array;

FIG. 6 is a schematic diagram of distribution of light signals in photosensitive areas and blind areas on the second light-receiving sensor array.

Detailed ways

As shown in Figure 1 and Figure 2, an automatic foreign matter inspection machine with a double light signal receiving sensor array structure, it is equipped with a light emitting tube assembly 1, a light emitting light collecting mirror 2, a light receiving light collecting light in sequence from left to right Mirror 4, imaging mirror 5, first light-receiving sensor array 7, and a sealed container 3 containing a transparent or translucent liquid to be tested is placed on the intermittent rotating body between the light-emitting light-collecting mirror and the light-receiving light-collecting mirror , which is characterized by:

A. There is a first light barrier 9 in front of the first photoreceiving sensor array 7;

B. be provided with 45 degree semi-reflective semi-transmissive beam splitters or beam splitting cube prism 6 between described imaging mirror 5 and first diaphragm 7;

C. The light beam emitted by the luminous tube assembly 1 is formed into a parallel light beam through the light emission collecting mirror 2, and the parallel light beam passes through the intermittently rotating transparent or translucent liquid sealed container 3 containing the liquid to be tested, and enters the light receiving Light collecting mirror 4 forms the imaging beam of the solution area in the detected container by imaging mirror 5. The imaging beam is divided into two parts, direct and reflective, by a 45-degree semi-reflective and semi-transmissive beam splitter or beam splitting cube prism 6. There is a second light-receiving sensor array 8, and a second light bar 10 is placed in front of the second light-receiving sensor array 8; the light beam emitted by the luminous tube assembly 1 forms a parallel light beam through the light-emitting collecting mirror 2, and passes through the imaging mirror 5. The direct part of the imaging light beam that forms the solution area in the container 3 to be detected passes through the first light bar 9 and reaches the first light-receiving sensor array 7, and the reflected part of the imaging light beam passes through the second light bar 10 and reaches the second light-receiving sensor array The array 8 constitutes a dual light-receiving sensor array structure to detect foreign objects in the liquid in the container.

The first and second light-receiving sensor array devices are selected from the same device, and when the two light-receiving sensor arrays are installed, there is a misalignment in the vertical position, and the distance of the misalignment is equal to that of adjacent light-receiving sensor arrays. Half of the interval between the two photosensitive tubes ensures full reception of the optical signal.

The working principle of the present invention is described as follows:

The light beam emitted by the luminous tube assembly 1 forms a parallel beam through the light-emitting light collecting mirror 2, and the light beam passes through the detected transparent or translucent sealed container (ampule and infusion bottle, etc.) 3 that rotates intermittently, and enters the light-receiving light collecting mirror 4 , the imaging mirror 5 forms an imaging beam of the solution area in the detected container, and the imaging beam directly reaches the first light-receiving sensor array 7 . In this way, the imaging light beam is received by a single light-receiving sensor array, but the light-receiving sensor is composed of dozens of independent photosensitive tubes, so the photosensitive surface is not continuous. As shown in Figure 3, the hatched area in the figure is the photosensitive surface, and the rest are blind areas. In this way, not all the imaging light beams projected onto the light-receiving sensor array are converted into electrical signals, but only the light signals projected onto the photosensitive surface are converted into electrical signals. The optical signal projected into the blind area cannot be converted into an electrical signal. In order to supplement the optical signal reception in the blind area, the present invention proposes an automatic foreign object inspection machine with an optical path structure as shown in FIG. 1 and a specific structure as shown in FIG. 2 with a dual optical signal receiving sensor array structure. A feature of the present invention is exactly to set up 45 degree semi-reflective semi-transmissive beamsplitter or beam-splitting cube prism 6 in the light path that reaches the first light-receiving sensor array 7, the imaging light beam that receives like this is split by 45 degree semi-reflective semi-transmissive beam-splitter cube The prism 6 splits the light into two beams to form two identical images, one of which is received by the light-receiving sensor array 7 and the other image is received by the light-receiving sensor array 8 . The optical signal received in this way is divided into two parts, as shown in FIG. 4 , which sets the optical image signal to be equally divided. After division, the vertical widths of the light-receiving area and the dark area are equal. The left oblique line part is shown in Figure 5, and the right oblique line part is shown in Figure 6. If the light signal of the portion shown in FIG. 5 is received by the light-receiving sensor array 7, the light signal of the portion shown in FIG. 6 is received by the light-receiving sensor array 8. Fig. 4 shows all optical signals, and such a double light receiving sensor array structure makes the reception of optical signals not be missed due to the insensitive area between the photosensitive tubes.

If the same light-receiving sensor array device is selected in the light path structure, there is a misalignment in the vertical position when the two light-receiving sensor arrays are installed, and the distance of the misalignment is the center of two adjacent photosensitive tubes in the light-receiving sensor array. half the distance. This ensures full reception of the optical signal. If the width in the vertical direction of the photosensitive area of the photosensitive tube is greater than the width of the blind area, the reception of the optical signal has a certain coverage, but the vertical width of the photosensitive area of the photosensitive tube cannot be smaller than the width of the blind area, which will cause omission of optical signal reception.

Another feature of the present invention is that a light barrier is arranged before the two light-receiving sensor arrays, and the light barrier is a slit light barrier. Adjusting the width of the light barrier can adjust the luminous flux entering the light-receiving sensor array, and also adjust The signal-to-noise ratio of detecting foreign matter (the ratio of the effective area to be detected to the area of foreign matter), the smaller the aperture slit, the higher the relative detection signal-to-noise ratio, which can fully improve the optical detection signal-to-noise ratio, just adjust the width of the aperture slit Adjust the detection signal-to-noise ratio to improve sensitivity. And other areas where all optical signals are received without omission, such as: optical fiber, photosensitive tubes are misplaced, but the width of the aperture slit cannot be adjusted arbitrarily, and the signal-to-noise ratio cannot be fully improved.

Claims (2)

1. automatic foreign body checking machine with double-photo signal receiving sensor array structure, it is equipped with luminotron assembly, light emission collecting lens, light-receiving collecting lens, imaging mirror, the first optical receiving sensor array from left to right successively, the airtight container that includes the transparent or semitransparent liquid of tested liquid places intermittence between light emission collecting lens and the light-receiving collecting lens on the rotary body, it is characterized in that:

A. before the described first optical receiving sensor array, be equipped with the first smooth hurdle;

B. between the described imaging mirror and the first smooth hurdle, have additional 45 degree half reflection and half transmission spectroscope or beam split block prisms;

C. the light beam that is sent by described luminotron assembly forms parallel beam through light emission collecting lens, parallel beam passes the intermittently airtight container of the transparent or semitransparent liquid that includes tested liquid of rotation, enter the light-receiving collecting lens, form the imaging beam in the solution zone in the detected container by the imaging mirror, imaging beam is divided into direct projection and reflection two parts by 45 degree half reflection and half transmission spectroscopes or beam split block prism, on reflected light path, have additional the second optical receiving sensor array, be equipped with the second smooth hurdle in the second optical receiving sensor array front; The light beam that is sent by the luminotron assembly forms parallel beam through light emission collecting lens, the direct projection part that forms the imaging beam in the solution zone in the detected container via the imaging mirror arrives the first optical receiving sensor array through the first smooth hurdle, the reflecting part of imaging beam arrives the second optical receiving sensor array through the second smooth hurdle, has constituted the foreign matter in two optical receiving sensor array structure detection receptacle liquid.

2. a kind of automatic foreign body checking machine according to claim 1 with double-photo signal receiving sensor array structure, it is characterized in that, first, second optical receiving sensor array device is selected identical device for use, and a dislocation, the distance of dislocation to be arranged when two optical receiving sensor arrays are installed on the upright position be at interval half of adjacent two photosensitive tubes in the optical receiving sensor array.

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