CN105987668A - Mobile phone shell internal dimension measurement device based on image processing - Google Patents

Abstract

The invention discloses a device for measuring the internal dimensions of a mobile phone case based on image processing. Four horizontal fixing plates are arranged on a middle support frame, and the fixing plates are used to fix a measuring head unit based on an elastic mechanism. A CCD is arranged directly in front of the adapter rod of the probe unit, and the CCD is connected with the threaded hole of the CCD fixing plate through the external thread at the tail, and the CCD fixing plate is connected with the legs through the threaded holes at both ends. The measuring head unit when measuring the side height and groove depth of the mobile phone case is provided with an adapter rod at the end of the measuring rod. A large market CCD is set directly above the probe unit based on the elastic mechanism. The CCD is connected to the threaded hole of the CCD fixing plate through the external thread at the tail, and the CCD fixing plate is connected to the upper support frame through the threaded holes at both ends. The invention can obtain high-precision and high-sensitivity detection effects, and can measure the dimensions of deep holes and steps that are difficult to measure by non-contact methods; at the same time, it has the advantages of high stability, low cost and convenient assembly and adjustment.

Description

A device for measuring the internal dimensions of mobile phone shells based on image processing

technical field

The invention relates to the field of mobile phone case size measurement devices, in particular to an image processing-based mobile phone case internal size measurement device.

Background technique

In recent years, the rapid development of the mobile phone industry has led to an increase in the number of mobile phone production. At the same time, the quality inspection technology of mobile phones is also developing rapidly. The detection of the internal dimensions of the mobile phone shell is also one of the quality inspections. At present, the detection of mobile phone casings commonly seen on the market mainly includes manual detection, machine vision detection and three-coordinate measuring machine detection. Both manual and machine vision inspection belong to two-dimensional vision. The defect of this inspection method is that there are defects in the inspection of height and step height. The inspection of three-coordinate measuring machine is to measure each point to be measured, and the measurement process is long. .

The method of detecting the size of the mobile phone shell is slow in manual detection speed and has large errors; machine vision detection requires the use of light sources, cannot measure the height direction, and is susceptible to external interference; the traditional three-coordinate machine has slow measurement speed and is not conducive to assembly line operations. Measuring machine (CMM) is a new type of precision measuring instrument developed in the past 50 years. It is widely used in machinery manufacturing, automobile, electronics, aerospace and other industrial fields. Its accuracy is affected by its structure, material, drive system, grating scale, etc. During use, the measurement accuracy is affected by many environmental factors such as temperature, humidity, vibration, and dust, so it is suitable for laboratory use. The image projector is a non-contact detection method, which can quickly and manually detect the dimensions in the XY plane and in the Z direction, and can be programmed to realize automatic detection. The inspector can record the entire inspection process during manual inspection, including the setting parameters of the light, and generate a program, which can be directly run when the same product is inspected next time to realize automatic inspection. The image projector is suitable for multi-size inspection and multi-quantity sample inspection. The measurement accuracy is affected by environmental factors such as temperature and humidity, dust, vibration, light, etc. It is suitable for laboratory use.

Contents of the invention

The purpose of the present invention is to provide a device for measuring the internal dimensions of mobile phone shells based on image processing, so as to solve the problems existing in the measurement of the dimensions of mobile phone shells in the prior art.

In order to achieve the above object, the technical scheme adopted in the present invention is:

A device for measuring the internal dimensions of a mobile phone case based on image processing, which is characterized in that it includes a slide rail horizontally arranged along the left and right directions, an electric mobile platform is slidably installed on the left end of the slide rail, and an upper rail supported by a plurality of vertical legs. The support frame, the upper support frame spans horizontally above the right end of the slide rail, and the long sides of the left and right sides of the upper support frame are horizontally perpendicular to the slide rail, and the support between the legs directly below the upper support frame is parallel to the upper support frame. And the middle support frame with the same structure, a CCD is installed in the upper support frame through the CCD fixing plate, and the CCD lens in the upper support frame is vertically downward toward the middle support frame, and the front legs of the middle support frame are also passed through the CCD. The fixed plate is equipped with a CCD, and the CCD lens between the legs is horizontally facing backwards above the middle support frame. There are four fixed plates connected horizontally between the top of the left and right side of the middle support frame, and the four fixed plates are respectively It is located in the field of vision of the CCD lens in the upper support frame and the CCD lens in the front leg, and the long sides of the front and rear sides of the four fixing plates are respectively parallel to the slide rails, and the front and rear sides of the frontmost fixing plate are respectively along the There are one-shaped sliding holes in the left and right horizontal directions, and the positions of the front and rear side sliding holes in the frontmost fixing plate are staggered. The left and right horizontal directions are provided with a straight sliding hole, and the measuring head unit of the mobile phone case is respectively slidably installed in the sliding holes of the four fixing plates.

The device for measuring the internal dimensions of a mobile phone case based on image processing is characterized in that: the front and rear side sliding holes in the frontmost fixing plate are respectively slidably installed with measuring head units for measuring the height of the bottom step of the mobile phone case to measure the height of the mobile phone case. The probe unit with the height of the bottom of the shell includes a fixed outer frame, which is slidably installed on the corresponding sliding hole, and the long sides of the front and rear sides of the fixed outer frame are parallel to the sliding holes, and the left and right sides of the fixed outer frame Gaskets are arranged on the sides, and the positions of the gaskets on the left and right sides are symmetrical to each other. A rectangular floating piece with a matching shape is arranged in the fixed outer frame. The left and right ends of the top of the rectangular floating piece are respectively connected to the gaskets on the corresponding side. There is a V-shaped spring piece, and there is a vertical central through hole in the middle of the rectangular suspension piece. The upper part of the central through hole is coaxially inserted with a sensor rod, and the top of the sensor rod is vertically connected with an adapter rod that extends horizontally forward. There is a CCD lens in the side leg, and a gem ball is fixed at the front end of the adapter rod, a measuring rod is coaxially inserted in the lower part of the central through hole, and a gem ball is also fixed at the lower end of the measuring rod.

The device for measuring the internal dimensions of a mobile phone case based on image processing is characterized in that: the two sliding holes in the rearmost fixing plate and the right sides of the sliding holes in the middle two fixing plates are respectively installed to measure the side of the mobile phone case. The probe unit for step height and groove depth, the probe unit for measuring the step height and groove depth of the side of the mobile phone case includes a fixed outer frame, which is slidably installed on the sliding hole of the corresponding fixed plate, and the most rear fixed plate is used for measurement The left and right long sides of the fixed outer frame of the unit are parallel to the sliding hole. The front and rear long sides of the fixed outer frame of the right measurement unit in the middle two fixed plates are parallel to the sliding hole. Gaskets are provided on the top of the frame at the end, and the positions of the gaskets at both ends are symmetrical to each other. There is a rectangular suspension piece with a matching shape in the fixed outer frame, and a V-shaped spring piece is connected between the top of the rectangular suspension piece and the gasket on the corresponding side. , there is a vertical central through hole in the middle of the rectangular suspension plate, a sensor rod is coaxially plugged into the upper part of the central through hole, a gemstone ball is fixed on the upper end of the sensor rod, and a measuring rod is coaxially connected to the lower part of the central through hole, and the measurement rod is coaxially connected to the bottom of the central through hole, and the measurement rod is in the last fixed plate. The lower end of the measuring rod of the unit is vertically connected with an adapter rod extending horizontally backward, and the rear end of the connecting rod is fixed with a jewel ball. The transfer rod is fixed with a jewel ball at the right end of the transfer rod.

The device for measuring the internal dimensions of a mobile phone case based on image processing is characterized in that: the left sides of the sliding holes in the middle two fixing plates are respectively slidably installed with measuring head units for measuring the groove width of the mobile phone case, and measuring the groove width of the mobile phone case The probe unit includes a fixed outer frame, which is slidably installed on the left side of the sliding holes of the two fixed plates in the middle, and the front and rear long sides of the fixed outer frame are parallel to the sliding holes where they are located, and the two ends of the fixed outer frame in the direction of the long side Gaskets are provided on the top of the frame, and the positions of the gaskets at both ends are symmetrical to each other. There is a rectangular floating piece with a matching shape in the fixed outer frame. V-shaped spring pieces are connected between the top of the rectangular floating piece and the gasket on the corresponding side. There is a vertical central through-hole in the middle of the rectangular suspension, a sensing rod is coaxially inserted into the upper part of the central through-hole, a jewel ball is fixed on the upper end of the sensing rod, a measuring rod is coaxially inserted into the lower part of the central through-hole, and the lower end of the measuring rod is vertically connected with a horizontal The extension rod extended on the left, the left end of the transfer rod is fixed with a deflection type probe.

The device for measuring the internal dimensions of a mobile phone case based on image processing is characterized in that: the electric mobile platform includes a stand and a workbench, the stand is slidably installed on the left end of the slide rail, and the workbench is slidably installed on the left end of the slide rail The right side of the stand, and the workbench extends horizontally to the right.

Compared with the prior art, the beneficial effects of the present invention are reflected in:

1. The present invention integrates the advantages of three-coordinate measuring machine and visual measurement. It can not only measure the dimensions of deep holes and steps that are difficult to measure by visual methods, but also realize parallel measurement with the help of visual technology to improve the measurement speed.

2. The present invention adopts the probe unit based on the elastic mechanism, which has the advantages of simple structure, low cost and high sensitivity.

/3. The present invention adopts CCD as the measurement unit, which has the advantages of high resolution, good dynamic response and good precision.

4. The present invention adopts an aluminum alloy structure bracket, which has the advantages of convenient installation, light weight and good stability.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the present invention

Fig. 2 is the structural representation of measuring device of the present invention

Fig. 3 is a schematic diagram of the layout and fixed structure of the probe unit of the present invention

Fig. 4, Fig. 5 are the schematic diagrams of measuring step height of the present invention

Fig. 6 is the schematic diagram of measuring groove depth of the present invention

Fig. 7 is the schematic diagram of measuring groove width of the present invention

Fig. 8 is a schematic diagram of the structure of the measuring head unit for measuring the step height of the bottom of the mobile phone case.

Fig. 9 is a schematic diagram of the structure of the measuring head unit for measuring the step height and groove depth of the side of the mobile phone case.

Fig. 10 is a schematic structural diagram of a probe unit for measuring the groove width of a mobile phone case.

Fig. 11 is a schematic diagram of the detection principle in the vertical direction of the present invention.

Fig. 12 is a schematic diagram of the detection principle in the horizontal direction of the present invention.

detailed description

As shown in Figures 1-3, a device for measuring the internal dimensions of a mobile phone case based on image processing includes a slide rail 8 horizontally arranged along the left and right directions. The upper support frame 2a supported by two vertical legs, the upper support frame 2a horizontally spans above the right end of the slide rail 8, and the long sides of the left and right sides of the upper support frame 2a are horizontally perpendicular to the slide rail 8, and the upper support frame 2a is directly below A middle support frame 2b that is parallel to the upper support frame 2a and has the same structure is supported between a plurality of legs of the upper support frame 2a. The CCD5b is installed through the CCD fixing plate 4b in the upper support frame 2a, and the lens of the CCD5b in the upper support frame 2a faces vertically downwards. Middle support frame 2b, CCD5a is also installed by CCD fixed plate 4a between the legs of the middle support frame 2b front side, and the CCD5a camera lens between the legs is horizontally facing the middle support frame 2b top backward, middle support frame 2b left, Four fixing plates 3a, 3b, 3c, 3d are horizontally connected between the top of the right side frame, and the four fixing plates 3a, 3b, 3c, 3d are respectively located in the CCD5b lens in the upper support frame 2a and the CCD5a lens in the front leg In the field of vision, and the long sides of the front and rear sides of the four fixed plates 3a, 3b, 3c, 3d are respectively parallel to the slide rail 8, wherein the front and rear positions of the most forward fixed plate 3a are respectively arranged along the left and right horizontal directions. Glyph-shaped sliding holes, and the positions of the front and rear side sliding holes in the frontmost fixing plate 3a are staggered, and a pair of glyph-shaped sliding holes are provided in the rearmost fixing plate 3d along the front and rear horizontal directions, and a pair of glyph-shaped sliding holes are arranged in the front and rear fixing plates 3b and 3c, respectively. There are in-line sliding holes in the left and right horizontal directions, and the measuring head unit 6 of the mobile phone case is respectively slidably installed in the sliding holes of the four fixing plates 3a, 3b, 3c, 3d.

As shown in Figure 5 and Figure 8, the front and rear side sliding holes in the frontmost fixed plate 3a are respectively slidably installed with a probe unit 6a for measuring the height of the bottom step of the mobile phone case, and a probe unit 6a for measuring the height of the bottom step of the mobile phone case Including the fixed outer frame 6a8, the fixed outer frame 6a8 is slidably installed on the corresponding slide holes, and the long sides of the front and rear sides of the fixed outer frame 6a8 are parallel to the slide holes, and the left and right sides of the fixed outer frame 6a8 are respectively provided with There are gaskets 6a5, and the positions of the gaskets on the left and right sides are symmetrical to each other. The fixed outer frame 6a8 is provided with a matching rectangular suspension piece 6a3, and the left and right ends of the top of the rectangular suspension piece 6a3 are respectively connected to the gaskets on the corresponding There is a V-shaped spring piece 6a4, and a vertical central through hole is arranged in the middle of the rectangular suspension piece 6a3, and the upper part of the central through hole is coaxially inserted with a sensing rod 6a2, and the top of the sensing rod 6a2 is vertically connected with an adapter rod 6a6 extending horizontally forward. The front end of the connecting rod 6a6 points to the CCD lens 5a in the front leg, and the front end of the connecting rod 6a6 is fixed with a jewel ball 6a1, and the lower part of the central through hole is coaxially inserted with a measuring rod 6a7, and the lower end of the measuring rod is also fixed with a jewel ball.

As shown in Figure 4, Figure 6 and Figure 9, on the two sliding holes in the rearmost fixing plate 3d, and on the right side of the sliding holes in the middle two fixing plates 3b, 3c, there are respectively sliding installations to measure the side height and groove of the mobile phone case. The deep measuring head unit 6b, the measuring head unit 6b for measuring the step height and groove depth of the side of the mobile phone case includes a fixed outer frame 6b8, which is slidably installed on the sliding hole of the corresponding fixed plate, wherein the rearmost fixed plate 3d The left and right sides of the fixed outer frame 6b8 of the measurement unit 6b are parallel to the slide holes, and the front and rear long sides of the fixed outer frames of the right measurement unit in the middle two fixed plates 3b and 3c are parallel to the slide holes. Gaskets 6b5 are respectively provided on the top of the frame edge at both ends of the outer frame 6b8 in the long side direction. V-shaped spring pieces 6b4 are respectively connected between the spacers, and there is a vertical central through hole in the middle of the rectangular suspension piece 6b3. The upper part of the central through hole is coaxially inserted with a sensing rod 6b2, and the upper end of the sensing rod 6b2 is fixed with a jewel ball 6b1. The central through hole The lower part is coaxially plugged with a measuring rod 6b7, wherein the lower end of the measuring rod 6b7 of the measuring unit 6b in the rearmost fixed plate 3d is vertically connected with an adapter rod 6b6 extending horizontally backward, and the rear end of the adapter rod is fixed with a jewel ball. The lower ends of the measuring rods of the measuring units on the right side of the fixed plates 3b and 3c are respectively vertically connected with an adapter rod extending horizontally to the right, and the right end of the adapter rod is fixed with a jewel ball.

As shown in Fig. 7 and Fig. 10, the measuring head unit 6c for measuring the groove width of the mobile phone case is slidably installed on the left side of the sliding holes in the middle two fixing plates 3b and 3c, and the measuring head unit 6c for measuring the groove width of the mobile phone case includes a fixed The outer frame 6c8, the fixed outer frame 6c8 is slidably installed on the left side of the sliding holes of the two fixed plates 3b and 3c in the middle, and the front and rear long sides of the fixed outer frame 6c8 are parallel to the sliding holes where the fixed outer frame 6c8 is located. Gaskets 6c5 are respectively provided on the top of the frame edge at the end, and the positions of the gaskets at both ends are symmetrical to each other. A rectangular floating piece 6c3 with matching shape is arranged in the fixed outer frame 6c8, and the top of the rectangular floating piece 6c3 is respectively connected with the gasket on the corresponding side. V-shaped spring piece 6c4, a vertical central through hole is arranged in the middle of the rectangular suspension piece 6c3, the upper part of the central through hole is coaxially inserted with a sensing rod 6c2, the upper end of the sensing rod 6c2 is fixed with a jewel ball 6c1, and the lower part of the central through hole is coaxially inserted with a measuring Rod 6c7, the lower end of the measuring rod 6c7 is vertically connected with an adapter rod 6c6 extending horizontally to the left, and the left end of the adapter rod 6c6 is fixed with a swing-type probe 6c9.

The electric mobile platform 1 comprises a stand and a workbench, the stand is slidably installed on the left end of the slide rail 8, the workbench is vertically slidably installed on the right side of the stand, and the workbench is horizontally extended to the right.

In the present invention, the measuring head unit 6a is connected with two pads 6a5 at both ends above a fixed outer frame 6a8, and the two ends of the pads 6a5 are respectively connected with the two ends of the V-shaped spring piece 6a4, and the other end of the V-shaped spring piece 6a4 Connect with one arm end of the rectangular suspension piece 6a3 in the center of the fixed outer frame 6a8, set the induction rod 6a2 above the central through hole of the rectangle suspension sheet 6a3, connect the transfer rod 6a6 perpendicular to it at the upper end of the induction rod 6a2, and transfer A jewel ball 6a1 is fixed to the end of the rod 6a6. A measuring rod 6a7 is arranged below the central through hole of the rectangular suspension sheet 6a3, and a jewel ball is fixed at the lower end of the measuring rod 6a7.

Before the probe unit 6a senses, the jewel ball 6a at the end of the transfer rod 6a6 is imaged at a fixed position on the front CCD5a, and after the measuring rod 6a7 senses, the jewel ball 6a1 is imaged on the CCD5a at the same position as before. The ratio has a relative displacement, and the difference of the relative displacement can be measured through image processing, and then the step height of the bottom of the mobile phone case 7 can be calculated by determining the proportional coefficient.

First place the mobile phone case on the electric mobile platform 1, and then control the movement of the electric mobile platform so that it sends the mobile phone case directly below the measuring unit. When measuring the height of the bottom step of the mobile phone case 7, the jewel ball 6a1 at the top of the two probe units 6a measuring the height of the bottom step is at the same level as the imaging position of the side CCD5a, and the electric mobile platform 1 is controlled to rise to a certain level. Height, because the heights of the two probe units 6a contacting the bottom of the mobile phone case 7 are different, so there is a height difference in the imaging position of the jewel ball 6a1 on the top of the two probe units 6a on the CCD5a, the height difference is calculated through image processing, and the proportional coefficient is determined After that, the bottom step height of the measured mobile phone case 7 can be calculated. When measuring the side height and groove depth of the mobile phone case 7, the basic principle is the same as that of measuring the bottom height, the only difference is that the gemstone ball 6b1 at the top of the probe unit 6b is imaged on the CCD5b above it, and the gemstone ball 6b1 is imaged on the CCD5b The relative displacement difference is used to calculate the step height and groove depth. When measuring the groove width, the two deflecting probes 6c9 of the two measuring units 6c move to the two sides of the groove respectively. When the deflecting probe 6c9 touches the edge of the groove, it stops moving, and the relative displacement is reflected according to the image processing on the CCD5b. From this the groove width is measured.

In specific implementation, the corresponding structural settings also include:

The measuring head unit 6b when measuring the side height and groove depth of the mobile phone case 7 sets the adapter rod 6b6 at the lower end of the measuring rod 6b7, and the other structures are the same as the measuring head unit 6a. The probe used at the bottom of the measuring head unit 6c used for measuring the groove depth is a deflection type probe 6c9, and other structures are the same as the measuring head unit 6b.

In this embodiment, a long through-hole-shaped slide hole is set on the fixed plate 3, and the side head unit 6 is placed on the fixed plate 3 slide hole, so that the measuring head unit 6 can be adjusted on the fixed plate 3, and the fixed plate Two threaded holes are drilled at both ends of 3 respectively, and are connected with the middle support frame 2b through the threaded holes.

In this embodiment, a large field of view CCD5b is set on the upper end of the mobile phone case, and the CCD5b is connected with the CCD fixing plate 4b directly above it by threads, and two threaded holes are respectively arranged at the two ends of the fixing plate 4b. Connect with the upper support frame 2a. Because when measuring the height of the bottom of the mobile phone case 7, the CCD5b directly above the mobile phone case 7 cannot sense the displacement of the jewel ball 6a, so when measuring the height of the step here, use the probe unit 6a to use the vertical adapter rod 6a6 to Its jewel ball 6a1 is at the transfer rod 6a6 top, and a CCD5a is arranged on the left side of the mobile phone case 7, and the CCD5a is connected with the CCD fixed plate 4a by a threaded hole, and two threaded holes are respectively arranged at the two ends of the CCD fixed plate 4a. Outrigger connection.

The side head unit based on the elastic mechanism is a contact probe. When sensing the internal size of the mobile phone case, it is necessary to ensure that the surface of the object cannot be damaged, so a high-sensitivity mechanical mechanism is required. In this embodiment, the V-shaped spring piece 6b4 as an elastic element adopts a beryllium bronze reed piece, a jewel ball 6b1 is arranged on the top of the probe unit 6b, and a CCD5b is arranged directly above the mobile phone case 7. When the probe is stressed due to contact with an object , the two V-shaped spring pieces 6b4 will be deformed, resulting in a relative displacement of the jewel ball 6b1 on the top. According to the displacement change before and after the V-shaped spring piece 6b4 is stressed, the imaging position of the jewel ball 6b1 on the CCD5b will be changed. , after image processing, the relative displacement difference of the jewel ball 6b1 on the top of the two side head units 6b is calculated, so as to obtain the size to be measured.

The working principle of the measuring unit in this embodiment is shown in Figure 11 and Figure 12:

Before the measurement, the jewel ball on the top of the probe unit 6 is imaged at a fixed position on the CCD5. After the measurement, the jewel ball has a relative displacement, that is, the image of the jewel ball on the CCD5 will also have a relative displacement x, at the measurement level At this time, the step height H=k(x ₁ −x ₂ ) can be calculated according to the difference in relative displacement of the two measuring head units 6 . In the formula, x1 is the displacement of the jewel ball on the top of _one probe unit; _x2 is the displacement of the jewel ball on the top of the other probe unit; H is the step height measured by the two probe units; k is the proportional coefficient.

Claims (5)

1. A device for measuring the internal dimensions of a mobile phone shell based on image processing, characterized in that: it includes a slide rail horizontally arranged along the left and right directions, an electric mobile platform is slidably installed on the left end of the slide rail, and it also includes a plurality of vertical legs. The upper support frame spans horizontally above the right end of the slide rail, and the long sides of the left and right sides of the upper support frame are horizontally perpendicular to the slide rail. Frames are parallel to the middle support frame with the same structure, a CCD is installed through the CCD fixing plate in the upper support frame, and the CCD lens in the upper support frame is vertically downward toward the middle support frame, and between the legs of the front side of the middle support frame The CCD is installed through the CCD fixing plate, and the CCD lens between the legs is horizontally facing backwards above the middle support frame. The boards are respectively located in the field of view of the CCD lens in the upper support frame and the CCD lens in the front leg, and the long sides of the front and rear sides of the four fixing boards are respectively parallel to the slide rails, and the front and rear sides of the frontmost fixing board are located There are one-shaped sliding holes along the left and right horizontal directions, and the positions of the front and rear side sliding holes in the frontmost fixing plate are staggered. The rearmost fixing plate is provided with a pair of glyph sliding holes along the front and rear horizontal directions. One-shaped sliding holes are respectively arranged along the left and right horizontal directions, and the measuring head units of the mobile phone case are respectively slidably installed in the sliding holes of the four fixing plates. 2. A device for measuring the internal dimensions of a mobile phone case based on image processing according to claim 1, characterized in that: the front and rear side sliding holes in the frontmost fixing plate are respectively slidably installed to measure the bottom step height of the mobile phone case Probe unit, the probe unit for measuring the height of the bottom of the mobile phone case includes a fixed outer frame, which is slidably installed on the corresponding sliding holes, and the long sides of the front and rear sides of the fixed outer frame are parallel to the sliding holes, and the fixed outer frame Gaskets are respectively provided on the left and right side of the frame, and the positions of the gaskets on the left and right sides are symmetrical to each other. There are rectangular floating pieces with matching shapes in the fixed outer frame. The left and right ends of the top of the rectangular floating pieces are connected to the The gaskets are connected with V-shaped spring pieces respectively, and there is a vertical central through hole in the middle of the rectangular suspension piece. The upper part of the central through hole is coaxially inserted with a sensing rod, and the top of the sensing rod is vertically connected with an adapter rod extending horizontally forward. The front end of the adapter rod points to the CCD lens in the front leg, and the front end of the adapter rod is fixed with a jewel ball, the lower part of the central through hole is coaxially inserted with a measuring rod, and the lower end of the measuring rod is also fixed with a jewel ball. 3. A device for measuring the internal dimensions of a mobile phone case based on image processing according to claim 1, characterized in that: the right sides of the two sliding holes in the rearmost fixing plate and the sliding holes in the middle two fixing plates respectively slide The probe unit for measuring the side height and groove depth of the mobile phone case is installed. The probe unit for measuring the side height and groove depth of the mobile phone case includes a fixed outer frame, which is slidably installed on the sliding hole of the corresponding fixed plate, and the last The left and right long sides of the fixed outer frame of the measuring unit in the square fixed plate are parallel to the sliding hole, and the front and rear long sides of the fixed outer frame of the right measuring unit in the middle two fixed plates are parallel to the sliding hole. Gaskets are respectively provided on the top of the frame edge at both ends of the outer frame in the long side direction, and the positions of the gaskets at both ends are symmetrical to each other. A rectangular suspension piece with a matching shape is provided in the fixed outer frame. The top of the rectangular suspension piece and the gaskets on the corresponding side are respectively A V-shaped spring piece is connected, and a vertical central through-hole is arranged in the middle of the rectangular suspension piece. A sensing rod is coaxially inserted into the upper part of the central through-hole, a jewel ball is fixed on the upper end of the sensing rod, and a measuring rod is coaxially inserted into the lower part of the central through-hole. The lower end of the measuring rod of the measuring unit in the last fixed plate is vertically connected with an adapter rod extending horizontally backward, and the rear end of the connecting rod is fixed with a jewel ball. There is an adapter rod extending horizontally to the right, and a jewel ball is fixed at the right end of the adapter rod. 4. A device for measuring the internal dimensions of a mobile phone case based on image processing according to claim 1, characterized in that: a probe unit for measuring the groove width of the mobile phone case is respectively slidably installed on the left side of the sliding holes in the middle two fixing plates , the probe unit for measuring the groove width of the mobile phone case includes a fixed outer frame, which is slidably installed on the left side of the sliding holes of the two fixing plates in the middle, and the front and rear long sides of the fixed outer frame are parallel to the sliding holes where they are located. Gaskets are provided on the top of the frame at both ends of the long side of the frame, and the positions of the gaskets at both ends are symmetrical to each other. There are rectangular floating pieces with matching shapes in the fixed outer frame, and the tops of the rectangular floating pieces are respectively connected to the gaskets on the corresponding sides. There is a V-shaped spring piece. There is a vertical central through hole in the middle of the rectangular suspension piece. A sensor rod is coaxially inserted into the upper part of the central through hole. A jewel ball is fixed on the upper end of the sensor rod. A measuring rod is coaxially inserted into the lower part of the central through hole. The lower end is vertically connected with an adapter rod extending horizontally to the left, and the left end of the adapter rod is fixed with a swing-type probe. 5. A device for measuring the internal dimensions of a mobile phone case based on image processing according to claim 1, wherein the electric mobile platform includes a stand and a workbench, the stand is slidably installed on the left end of the slide rail, and the workbench Slidingly installed on the right side of the stand vertically, and the workbench extends horizontally to the right.