CN212963207U - Height adjusting mechanism for reference ruler - Google Patents

Abstract

The utility model provides a reference ruler height control mechanism, be used for placing the platform of measuring the volume of awaiting measuring object including the upper surface, perhaps near platform sets up the reference ruler that the surface has the scale on the platform, and the distance that the reference ruler setting made on elevating system on the reference ruler between the surface and the platform upper surface at scale place can be adjusted. The lifting mechanism comprises a fixed end at the lower end and a lifting end above the fixed end; the lifting end is provided with a cross arm which can be contacted with the upper surface of an object to be measured; when the lifting end moves, the distance from at least one reference point to the upper surface of the platform is half of the distance from the lifting end to the upper surface of the platform, a reference scale is arranged at the reference point, and the scale surface of the reference scale is parallel to the upper surface of the platform. The utility model discloses when the cross arm descends and measures the last surface contact of volume object, the reference scale is measuring the high near of half thickness place of volume object all the time, can improve measurement accuracy effectively.

Description

Height adjusting mechanism for reference ruler

Technical Field

The utility model belongs to aquatic products class visual measurement field, concretely relates to scale height adjusting mechanism.

Background

When fish characters such as body length, body height, tail handle length and the like are measured through a machine vision technology, a reference ruler is usually placed on a plane, a fish body is placed on the plane, the fish body and the reference ruler are vertically and downwards subjected to image acquisition through a camera to obtain a group picture of the fish body and the reference ruler, pixels are converted through the reference ruler, and therefore all character parameters of the fish body are measured, generally, the size of an object in the acquired picture is close to large, if the thickness of the fish body is small, the distance between the reference ruler and the surface of the fish body is close, the reference ruler is used as a standard to measure the fish character parameters, and the error is within an acceptable range; when the fish body thickness is great, the reference scale plane is great with fish body surface distance, and the relative fish body surface distance camera of reference scale is far away to the pixel distance that this reference scale converted will increase the error when measuring fish characters, measures the failure. In addition, in the existing measuring method, property parameters vertical to the fish body shooting plane, such as parameters of fish body thickness and the like, cannot be obtained.

SUMMERY OF THE UTILITY MODEL

The utility model provides a reference ruler height adjusting mechanism.

The purpose of the utility model is realized with the following mode: reference ruler height control mechanism is used for placing the platform of measuring the volume of awaiting measuring including the upper surface, on the platform or near the platform set up the surface and have the reference ruler of scale, the reference ruler setting makes on elevating system the surface and the platform upper surface between the scale place can adjust on the reference ruler.

The lifting mechanism comprises a fixed end at the lower end and a lifting end above the fixed end; the lifting end is provided with a cross arm which can be contacted with the upper surface of an object to be measured; when the lifting end moves, the distance from at least one reference point to the upper surface of the platform is half of the distance from the lifting end to the upper surface of the platform, a reference scale is arranged at the reference point, and the scale surface of the reference scale is parallel to the upper surface of the platform.

The lifting mechanism comprises a four-bar linkage mechanism arranged on the platform or near the side surface of the platform; the four-bar linkage mechanism is formed by hinging four connecting rods end to end; in four hinge points of the four-bar linkage mechanism, a first hinge point is fixed to form a fixed end of the lifting mechanism, and a second hinge point opposite to the first hinge point forms a lifting end of the lifting mechanism; the other two hinge points are respectively a third hinge point on the left side and a fourth hinge point on the right side; a cross arm is arranged at the second hinge point; the length of the connecting rod between the third hinge point and the first hinge point is the same as that of the connecting rod between the third hinge point and the second hinge point; the length of the connecting rod between the fourth hinge point and the first hinge point and the length of the connecting rod between the fourth hinge point and the second hinge point are the same; the datum point comprises an intersection point of a quadrilateral diagonal, and a datum scale is arranged at the datum point.

A connecting line of the third hinge point and the fourth hinge point is parallel to the upper surface of the platform; the reference point includes a straight line passing through the third hinge point and the fourth hinge point.

The horizontal column is internally provided with a long groove; four connecting rods of the quadrilateral mechanism are rotatably connected through connecting shafts; the connecting shafts at the third hinge joint and the fourth hinge joint are arranged in the long grooves in a sliding manner; the horizontal column is provided with a reference ruler.

Still include a stand, the connecting axle setting of first pin joint is at the stand lower extreme, and the connecting axle of second pin joint slides and sets up on the stand.

The cross arm is rotatably arranged at the lifting end.

The utility model has the advantages that: no matter how the thickness of an object to be measured, such as a fish body, is changed, when the cross arm is lowered to be in contact with the upper surface of the object to be measured, the reference scale is always near the height of the object to be measured with half the thickness and is in the same plane with the outline of the fish body, in an image acquired in the state, the reference scale is basically superposed with the measuring plane of the fish body, when the image is processed through machine vision to measure, the difference of measuring errors caused by the difference of the thickness of the fish body is avoided, the measuring precision can be effectively improved, and the measuring errors caused by the thickness of the object to be measured are ensured to be within an acceptable range.

Drawings

Fig. 1 is a schematic front view of an image acquisition and measurement apparatus.

Fig. 2 is a side view of fig. 1.

Fig. 3 is a top view of fig. 1.

FIG. 4 is a schematic view of a scale-adjusting mechanism.

Wherein, 1 is a column, 2 is a cross arm, 3 is a connecting rod, 4 is a connecting shaft, 5 is a reference scale, 6 is a horizontal column, 7 is a platform, 8 is an object to be measured, 9 is a first image acquisition device, 10 is a second image acquisition device, 11 is a fixed arm, 12 is an illumination device, 13 is a word line laser, 14 is a connecting wire, 15 is a controller, 16 is a computer, 17 is a first hinge point, 18 is a second hinge point, 19 is a third hinge point, and 20 is a fourth hinge point.

Detailed Description

The technical solution of the present invention will be described more fully hereinafter with reference to the accompanying drawings and specific embodiments, it being understood that the preferred embodiments described herein are merely for purposes of illustration and explanation, and are not intended to limit the invention. In the present invention, unless otherwise explicitly specified and limited, technical terms used in the present application shall have the ordinary meaning as understood by those skilled in the art to which the present invention pertains. The terms "connected", "fixed", "arranged" and the like are to be understood in a broad sense, and may be fixedly connected, detachably connected or integrated; can be directly connected or indirectly connected through an intermediate medium; either mechanically or electrically. Unless explicitly defined otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art. Unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features, or indirectly contacting the first and second features through intervening media. Furthermore, a first feature may be "on" or "over" or "above" a second feature, and the like, may be directly on or obliquely above the second feature, or may simply mean that the first feature is at a higher level than the second feature. A first feature "under" or "beneath" a second feature may be directly under or obliquely under the first feature or may simply mean that the first feature is at a lesser level than the second feature. Relational terms such as first, second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.

As shown in fig. 1 to 4, an image acquisition and measurement apparatus includes a platform 7 having an upper surface for placing an object to be measured, and a calibration module or a scale 5 having a scale on the surface is provided on or near the platform 7. A first image acquisition device 9 with a vertically downward lens, a linear laser 13 and a second image acquisition device 10 capable of receiving reflected laser are arranged above the platform 7. The first image acquisition device 9, the second image acquisition device 10 and the one-word line laser 13 device are electrically connected with a computer 16 and a controller 15 through a connecting wire 14. The linear laser 13 emits laser light obliquely downward, and a thin laser bright line from left to right can be formed in the middle of the platform. The lens of the second image acquisition device 10 faces the middle of the platform obliquely below, so that the laser bright line is positioned close to the middle of the image. The first image capturing device 9 and the second image capturing device 10 are adjusted so that the left and right boundaries of the two captured images match. After the image of the object 8 to be measured with the laser is obtained, the thickness contour line of the object 8 to be measured can be obtained through the processing of machine vision software and the calculation of a laser trigonometry. The first image pickup device 9 can pick up parameters such as the size of the object 8 to be measured. The first image acquisition means 9 and the second image acquisition means 10 are combined to obtain various parameters of the object 8 to be measured.

An illumination device 12 for improving the illumination intensity is also arranged above the platform 7. The lighting device is electrically connected with the controller, and the controller controls the lighting device to be opened and closed. The platform 7 or the vicinity of the platform 7 is provided with the upright post 1, the upper end of the upright post 1 is provided with a fixed arm 11 which can be adjusted up and down, and the first image acquisition device 9, the second image acquisition device 10, the linear laser 13 and the lighting device 12 are all arranged on the upright post 1

The height of the reference scale can be changed, and the reference scale height adjusting mechanism comprises a platform 7 and the platform 7 or a reference scale 5 with scales on the surface, wherein the reference scale 5 is arranged on the platform 7 or nearby the platform 7, and the distance between the surface where the scales are arranged on the reference scale 5 and the upper surface of the platform 7 can be adjusted by arranging the reference scale 5 on an elevating mechanism. The first image acquisition device 9 is used for taking pictures of the object to be measured 8 and the reference ruler 5 by means of a camera, acquired images are processed and measured through machine vision software, length and width isoparametric parameters of the object can be obtained, and the method can be used for measuring the fish body characters. The same problem when measuring the fish body, fish body thickness has big or small, and when gathering the picture, reference ruler 5 is fixed at a plane, and the fish body is then put on this plane, and when fish body thickness was less, the error was less, and when fish body thickness was great, the error was big, can't measure. In the existing mechanism, the height of the reference scale 5 is not adjustable, the thickness of an object is too large, the error is large, and the measuring result is influenced. The utility model discloses in, the distance between the plane that the scale was taken to reference scale 5 and the 7 upper surfaces of platform is adjustable, can adjust from top to bottom according to the thickness of the fish body, can effectually reduce the error, makes the error in the within range that can accept. The lifting mechanism can be various, and the existing common mechanisms can be used in the utility model.

The lifting mechanism comprises a fixed end at the lower end and a lifting end above the fixed end; the lifting end is provided with a cross arm 2 which can be contacted with the upper surface of an object 8 to be measured; when the lifting end moves, the distance from at least one reference point to the upper surface of the platform 7 on the lifting mechanism is half of the distance from the lifting end to the upper surface of the platform, the reference point is provided with a reference ruler 5, and the scale surface of the reference ruler 5 is parallel to the upper surface of the platform 7. No matter how the thickness of the object 8 to be measured, such as a fish body, changes, when the cross arm 2 is lowered to be in contact with the upper surface of the object 8 to be measured, the reference ruler 5 is always positioned near the height of the object 8 to be measured, and is positioned on the same plane with the contour of the fish body, in the image acquired in the state, the reference ruler 5 is basically superposed with the measurement plane of the fish body, when the image is processed through machine vision to measure, the measurement errors caused by the difference of the thickness of the fish body can be avoided, the measurement precision can be effectively improved, and the measurement errors caused by the thickness of the object to be measured can be ensured to be within an acceptable range.

Further, the lifting mechanism may include a four-bar linkage mechanism disposed on the platform 7 or near the side of the platform 7; the four-bar linkage mechanism is formed by hinging four connecting rods 3 end to end; in four hinge points of the four-bar linkage mechanism, a first hinge point 17 is fixed to form a fixed end of the lifting mechanism, and a second hinge point 18 opposite to the first hinge point 17 forms a lifting end of the lifting mechanism; the remaining two hinge points are a third hinge point 19 on the left and a fourth hinge point 20 on the right, respectively. A cross arm 2 is arranged at the second hinge point 18; the length of the connecting rod 3 between the third hinge point 19 and the first hinge point 17 and the connecting rod 3 between the third hinge point 19 and the second hinge point 18 are the same. The length of the connecting rod 3 between the fourth hinge point 20 and the first hinge point 17 and the connecting rod 3 between the fourth hinge point 20 and the second hinge point 18 are the same. The reference point comprises the intersection point of the quadrilateral diagonal of the four-bar linkage, and a reference scale 5 is arranged at the reference point. The scale 5 may be set through either or both reference points or multiple reference points. If there is only one reference point, the reference ruler 5 is fixedly arranged at the reference point, for example, a connecting rod is used to connect the third hinge point 19 and the fourth hinge point 20, and the third hinge point 19 and the fourth hinge point 20 can slide on the connecting rod; the center positions of the connecting rod at the third hinge point 19 and the fourth hinge point 20 are certain reference points, and since the connecting rod has a certain width, a groove is formed in the center position of the connecting rod, the reference ruler 5 is arranged in the groove, the reference ruler 5 is arranged like a cantilever structure, and certainly, in order to be more stable, more than 2 reference points are preferably used for fixing a certain reference ruler. Preferably, the four tie bars 3 are all the same length.

Furthermore, the connecting line of the third hinge point 19 and the fourth hinge point 20 is parallel to the upper surface of the platform 7; the reference point comprises a straight line passing through the third hinge point 19 and the fourth hinge point 20. In this case, there are many reference points, and two or more reference points may be arbitrarily selected to be connected to the scale 5. For example, the third hinge point 19 and the fourth hinge point 20 are selected to be slidably connected to the scale 5. In addition, the line connecting the first hinge point 17 and the second hinge point 18 is preferably perpendicular to the upper surface of the platform 7; however, the vertical direction is not essential, and the effect of raising and lowering the scale 5 may be achieved. For example, the plane of the quadrangle of the four-bar linkage has a certain included angle with the upper surface of the platform 7, in this case, the height of the reference on the quadrangle can still be changed by the inclined lifting of the four-bar linkage. If the line connecting the third hinge point 19 and the fourth hinge point 20 is not parallel to the upper surface of the platform 7, there is only one reference point.

The device also comprises a horizontal column 6, wherein a long groove is arranged in the horizontal column 6; four connecting rods 3 of the four-bar linkage mechanism are rotatably connected through a connecting shaft 4; the connecting shaft 4 at the third hinge point 19 and the fourth hinge point 20 is arranged in the long groove in a sliding manner; the horizontal column 6 is provided with a reference ruler 5. The scale 5 may be affixed to the horizontal post 6. The connecting shaft 4 can be a cylindrical screw, connecting holes matched with the cylindrical screw are formed in the four connecting rods 3, and the cylindrical screw penetrates through the connecting holes. The cross arm 2 is fixed on a cylindrical screw of the second hinge point 18.

The device also comprises a vertical column 1, wherein the connecting shaft 4 at the first hinge point 17 is arranged at the lower end of the vertical column 1, and the connecting shaft 4 of the second hinge point 18 is arranged on the vertical column 1 in a sliding manner. The upright post can also be provided with a long groove, and the connecting shaft 4 of the second hinge point 18 is arranged in the long groove and can slide along the long groove; of course, the upright 1 and the second hinge point 18 may be connected in another sliding manner. The lower end of the upright post 1 is provided with a round hole matched with the connecting shaft 4 at the first hinge point 17. The upright 1 is preferably perpendicular to the upper surface of the platform 7. The connecting shaft 4 at the first hinge point 17 is approximately the same height as the upper surface of the platform 7, so long as it is ensured that the height of the reference ruler 5 is just half of the distance between the upper surface of the platform 7 and the lower surface of the cross arm 2. The upright 1 in which the fixing arm 11 is located and the upright 1 provided with the four-bar linkage mechanism may be one upright or different uprights.

The cross arm 2 can be rotatably arranged at the lifting end. The cross arm 2 can be pivoted about the lifting end so that the object 8 to be measured can be placed on the platform 7 from above. In another embodiment, the lifting mechanism may also include at least one isosceles triangle mechanism with a variable length of the base, the lower vertex of the base of the isosceles triangle mechanism is the fixed end of the lifting mechanism, and the upper vertex is the lifting end of the lifting mechanism; the device also comprises an upright post 1, wherein the upper vertex slides in the groove of the upright post 1, and the lower vertex is fixed on the upright post 1; the connecting line of the third vertex of the isosceles triangle and the midpoint of the bottom edge is parallel to the upper surface of the platform 7. The third vertex of the isosceles triangle is the reference point. The lifting mechanism can also comprise at least two isosceles triangles with the same length of the bottom edge and the same height of the upper vertex and the lower vertex from the upper surface of the platform respectively. If two isosceles triangles share the bottom plate and the rest parts are respectively positioned at two sides of the bottom edge, the quadrangle in the structure is formed. The utility model discloses well reference scale elevating system can use in various image acquisition measuring device. Such as in an image measuring device that does not include the in-line laser 13 and the second image capturing device 10, and other mechanisms, are not limited to the embodiments specifically described in this patent.

In the specific implementation: firstly, the cross arm 2 and the four-bar linkage are pulled upwards, the side surface of an object 8 to be measured (taking a fish body as an example) is placed on the platform 7 upwards, the cross arm 2 descends, the fish body is adjusted left and right to place the cross arm 2 at the position of the fish body for measuring the body thickness, and at the moment, the horizontal column 6 attached with the reference ruler 5 is positioned at one half of the fish body thickness. Opening a linear laser 13, adjusting the front and rear positions of the fish body to enable the laser bright lines to irradiate the middle position of the fish body from head to tail, acquiring images by a second image acquisition device 10, processing the images by machine vision software to obtain the image only with the laser bright lines on the surface of the tested fish body, and calculating by a laser triangulation method to obtain the thickness contour line of the fish body from head to tail; the method comprises the steps of closing a linear laser 13, opening a lighting device 12, collecting pictures by a first image collecting device 9 to obtain a group picture of the side face of a fish body and a reference ruler 5, converting actual size represented by each pixel by machine vision software with the reference ruler 5 because the position of the reference ruler 5 on the picture is one half of the thickness of the fish body, namely on a profile surface when the side face of the fish body faces upwards, calibrating and measuring properties such as the length and the height of the fish body, wherein the measuring accuracy of the measuring device is higher than that of the position of the fixed reference ruler 5, the thicknesses of the fish body are different, the positions of a cross arm 2 and the reference ruler 5 change along with the thickness of the fish body, and the position of the reference ruler 5 is always located on the profile surface of the fish body, so that the measuring accuracy of the machine vision software on the properties of the fish body. The images acquired by the two image acquisition devices are combined into one image, and because the left and right boundaries of the two image acquisition devices are consistent, the one-to-one corresponding thickness of each section from the head to the tail of the fish body can be seen in the combined image, so that fish property parameters, such as the head width, the body thickness, the tail handle thickness and the like of the fish body, which cannot be obtained in a plan view are obtained.

It should be noted that terms used in the description such as "central," "lateral," "longitudinal," "length," "width," "thickness," "height," "front," "rear," "left," "right," "up," "down," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," and the like indicate orientations and positional relationships based on the orientation or positional relationship shown in the drawings, and are used merely for the purpose of slogan to describe the present patent, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation. Therefore, should not be construed as limiting the scope of the invention.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features. When the technical solutions are contradictory or cannot be combined, the combination of the technical solutions should be considered to be absent, and is not within the protection scope of the present invention. Also, it will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the spirit of the principles of the invention.

Claims (7)

1. Reference scale height adjustment mechanism is used for placing the platform of the volume of awaiting measuring object including the upper surface, set up the reference scale that the surface has the scale on the platform or near the platform, its characterized in that: the reference scale is arranged on the lifting mechanism, so that the distance between the surface of the scale on the reference scale and the upper surface of the platform can be adjusted.

2. The scale-height adjustment mechanism of claim 1, wherein: the lifting mechanism comprises a fixed end at the lower end and a lifting end above the fixed end; the lifting end is provided with a cross arm which can be contacted with the upper surface of an object to be measured; when the lifting end moves, the distance from at least one reference point to the upper surface of the platform is half of the distance from the lifting end to the upper surface of the platform, a reference scale is arranged at the reference point, and the scale surface of the reference scale is parallel to the upper surface of the platform.

3. The scale-height adjusting mechanism of claim 2, wherein: the lifting mechanism comprises a four-bar linkage mechanism arranged on the platform or near the side surface of the platform; the four-bar linkage mechanism is formed by hinging four connecting rods end to end; in four hinge points of the four-bar linkage mechanism, a first hinge point is fixed to form a fixed end of the lifting mechanism, and a second hinge point opposite to the first hinge point forms a lifting end of the lifting mechanism; the other two hinge points are respectively a third hinge point on the left side and a fourth hinge point on the right side; a cross arm is arranged at the second hinge point; the length of the connecting rod between the third hinge point and the first hinge point is the same as that of the connecting rod between the third hinge point and the second hinge point; the length of the connecting rod between the fourth hinge point and the first hinge point and the length of the connecting rod between the fourth hinge point and the second hinge point are the same; the datum point comprises an intersection point of a quadrilateral diagonal, and a datum scale is arranged at the datum point.

4. The scale-height adjustment mechanism of claim 3, wherein: a connecting line of the third hinge point and the fourth hinge point is parallel to the upper surface of the platform; the reference point includes a straight line passing through the third hinge point and the fourth hinge point.

5. The scale-height adjustment mechanism of claim 4, wherein: the horizontal column is internally provided with a long groove; four connecting rods of the quadrilateral mechanism are rotatably connected through connecting shafts; the connecting shafts at the third hinge joint and the fourth hinge joint are arranged in the long grooves in a sliding manner; the horizontal column is provided with a reference ruler.

6. The scale-height adjustment mechanism of claim 5, wherein: still include a stand, the connecting axle setting of first pin joint is at the stand lower extreme, and the connecting axle of second pin joint slides and sets up on the stand.

7. The scale height adjusting mechanism according to any one of claims 2 to 6, wherein: the cross arm is rotatably arranged at the lifting end.

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