CN216925486U - Section steel bending mechanism based on vision measurement - Google Patents
Section steel bending mechanism based on vision measurement Download PDFInfo
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- CN216925486U CN216925486U CN202220458911.9U CN202220458911U CN216925486U CN 216925486 U CN216925486 U CN 216925486U CN 202220458911 U CN202220458911 U CN 202220458911U CN 216925486 U CN216925486 U CN 216925486U
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Abstract
The utility model discloses a profile steel bending mechanism based on visual measurement, which comprises a profile steel bending machine and a bending degree measuring mechanism, wherein the profile steel bending machine comprises a workbench, and a plurality of pressing and conveying mechanisms are arranged on the workbench; the pressing and conveying mechanism comprises a pressing device and a rotating and conveying device which are arranged in a one-to-one correspondence manner; a second pushing device is fixedly connected to the workbench below each pressing and conveying mechanism, the second pushing device is provided with an extension rod and a pressing shaft, and the pressing shaft is used for jacking and pressing the bent section steel; and each driving motor, the first pushing device and the second pushing device are respectively connected with the electric control device through lines. The utility model integrally adopts visual detection and a new bending machine structure, further improves the visual detection structure and the bending machine structure, provides a product with moderate cost, processing effect and precision, solves the problem that the prior product only has high-end products and low-end products and lacks middle-end products, and is convenient to adapt to processing section steels with different models.
Description
Technical Field
The utility model relates to the technical field of machining, in particular to a profile steel bending technology.
Background
The section steel is a construction material commonly used in various construction scenes of tunnel engineering, bridge engineering, railway engineering and the like at present, the requirements of various construction occasions on the bending degree of the section steel are also various, and the section steel is bent into various shapes and bending degrees by a section steel bending machine.
The bending degree refers to the bending degree of the long-strip rolled piece (a profile, a rod and a pipe) in the length direction, and the chord height of the bending in each meter of length is the bending degree in each meter; the ratio of the total chord height to the total length of the total length bend is the total bend. The curvature depends on the radius of a circle where the arc is located, the curvature can be indicated by using the radius of the arc, and the curvature of the section steel is controlled by using the radius of the section steel after the section steel is subjected to nonlinear springback control.
The existing section steel bending machine comprises a workbench, the advancing direction of section steel is used as the downstream direction, a driving device and a plurality of section steel supporting devices are arranged on the workbench at intervals along the direction from the upstream to the downstream, and a working hydraulic cylinder (namely a working oil cylinder) for jacking and bending the section steel is also arranged on the workbench. When the bending machine is used, the section steel is placed on the bending machine and supported by the section steel supporting device, the working oil cylinder tightly supports the section steel, the driving device is started to enable the section steel to move towards the downstream direction, and the section steel is bent to the preset bending degree under the supporting force of the working oil cylinder in the moving process.
And (3) pushing the working oil cylinder to tightly push the section steel and start to calculate the bending degree when the section steel is not bent and deformed, wherein the length of the pushing of the oil cylinder is 10-15 mm (millimeter) each time, the driving device is enabled to rotate forwards or backwards, the section steel is driven to move forwards or backwards, and the operation is repeated until the section steel reaches the required radius. In the whole, the section steel is fed from the upstream end of the table and is fed from the downstream end.
Due to the existence of nonlinear resilience characteristics, the situation that the preset bending degree is achieved by one-time bending is very rare, and the bending degree of the section steel can be controlled to the preset target by bending for many times. The prior art lacks a technology for ensuring that the preset curvature is reached by one-time bending, so that the section steel repeatedly moves forward and backward on a section steel bending machine to repeatedly press and bend, the section steel can finally reach the preset curvature, the working efficiency is low, and the energy consumption is obviously improved by repeatedly moving forward, backward and pressing.
When the bending deviation value of the section steels such as H-shaped steel, I-shaped steel, channel steel and the like is measured, a traditional measuring method needs to use a cord which is long enough, two workers respectively press the two ends of the section steel on the same side and pull the cord with force, and the cord is tensioned as far as possible to be used as a chord of the section steel; meanwhile, the third operator determines the position where the maximum bending degree is measured by visual observation using a steel plate ruler, and visually observes the bending type (lateral bending, "S" bending, local bending at the end, and the like) of the whole branch profile, and records the value after measurement as the maximum bending degree value of the branch profile.
The traditional measuring tool and the traditional measuring method have the defects of complex measuring method, poor accuracy of measured data, low precision of the measuring tool, large influence degree of human factors, low measuring efficiency, more needed labor and the like, and the measured deviation value has larger error and can not be suitable for the quality control requirement of the modern section steel production line.
The patent "bending degree measuring device for section steel bending machine" (application number: 201821917879.6) and the patent "bending angle measuring device for section steel bending machine" (application number: 202021048808.4) propose solutions.
The curvature measuring device for the section steel bending machine (application number: 201821917879.6) can measure the curvature of section steel in real time, but the service life of the device is short, because the top of a measuring rod of the device is directly contacted with the surface of the section steel, a large friction force can be generated between the measuring rod and the measuring rod, the friction can cause irreversible damage to the measuring rod, the measuring rod can be abraded after a period of time use, the accuracy of a measuring result is influenced, and the accuracy of a long-time measuring result cannot be ensured; if the device is replaced frequently, the cost is increased and the time is wasted.
The solution proposed by the patent 'bending angle measuring device of a section steel bending machine' (application number: 202021048808.4) can also solve the problems encountered in the traditional method for measuring the bending degree, but the device also has the phenomenon that the measuring device is in direct contact with the section steel when the bending degree is measured, so that the abrasion phenomenon can occur, and the service life of the measuring device is shortened; this patent relies on the manual work to read the numerical value on the scale and carries out the manual computation in the measurement process, and the precision of artifical reading error influence result can appear in this process.
Patent 2021214019437, shaped steel crookedness laser measuring device disclose the shaped steel bending technology based on laser measurement method, and whole technical scheme is laser measurement + novel bending machine structure, has the advantage that the precision is high, but the cost is also very high simultaneously, is fit for as high-end product. Simultaneously, it still has the difficult conveying width that adjusts, and the shaped steel of the different models of adaptation is comparatively inconvenient problem.
Patent 2021214016123, the crooked device of visual measurement shaped steel disclose the shaped steel bending technique based on visual measurement method, and whole technical scheme is visual measurement + traditional bender structure, has with low costs advantage, is fit for as low end product. Meanwhile, it also has a problem that the environmental requirements are strict, otherwise the profile of the section steel may not be accurately recognized.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problems in the prior art, adopts a vision measurement and improved bending machine structure, has lower cost than a laser measurement method, and is convenient for adapting and processing section steels of various types.
In order to achieve the above object, the section steel bending mechanism based on vision measurement of the utility model comprises a section steel bending machine and a vision-based curvature measuring mechanism located at the downstream direction of the section steel bending machine,
the section steel bending machine comprises a workbench, and the advancing direction of the section steel is the downstream direction; a plurality of pressing and conveying mechanisms for pressing and conveying the section steel are linearly arranged on the workbench from the upstream to the downstream;
the pressing and conveying mechanism comprises a pressing device and a rotating and conveying device which are arranged in a one-to-one correspondence manner;
the rotary conveying device comprises an installation frame, a driving motor is arranged at the top of the installation frame, and an output shaft of the driving motor is downwards connected with a pressure bearing wheel for driving the section steel to advance;
the top pressing device comprises a first pushing device, an extension rod of the first pushing device faces the pressure bearing wheel, a pressure applying wheel is arranged at the end part of the extension rod of the first pushing device and used for pressing the processed section steel on the pressure bearing wheel, and the processed section steel is matched with the pressure bearing wheel and the pressure applying wheel in a rolling and pressing manner;
a second pushing device is fixedly connected to the workbench below each pressing and conveying mechanism, each second pushing device is provided with an extension rod, and a pressing shaft is mounted at the end of each extension rod and used for jacking and pressing the bent section steel; the extension direction of an extension rod of the second pushing device is perpendicular to the feeding direction of the section steel, and the first pushing device and the second pushing device are both working hydraulic cylinders or working electric push rods or working air cylinders;
and each driving motor, the first pushing device and the second pushing device are respectively connected with the electric control device through lines.
The curvature measuring mechanism comprises a camera mechanism and an illuminating mechanism; the method comprises the following steps that a forward path of the section steel on the downstream side of a workbench is called a downstream section steel path, a camera mechanism comprises a portal frame crossing the downstream section steel path, a camera is arranged at the top of the portal frame, the camera is located right above the downstream section steel path, and the shooting direction of the camera faces downwards;
the illuminating mechanisms are provided with a plurality of sets, and the illuminating mechanisms are dispersedly arranged on two sides of the downstream section steel path; each illuminating mechanism has the same structure and comprises an illuminating bracket, and an illuminating lamp is arranged at the top end of the illuminating bracket;
the illuminating lamp and the camera are respectively connected with an electric control device through lines, and the electric control device is connected with a display screen;
the lighting lamps are lower than the height of the downstream section steel path.
The bending machine is characterized by also comprising a shell, wherein the shell encloses the section steel bending machine and the bending degree measuring mechanism;
the shell upstream end is provided with an inlet for profile steel to enter, the shell downstream end is provided with an outlet for profile steel to be sent out, the outlet and the inlet are respectively provided with a cloth curtain or a plastic curtain for shielding external light, and the cloth curtain or the plastic curtain is provided with an opening for profile steel to pass through.
The lighting support and the portal frame both comprise telescopic support legs for adjusting the height, and the camera is mounted at the top of the portal frame through a universal cradle head; the electric control device is arranged on the workbench, and a movable door for operating the electric control device is arranged on the shell corresponding to the electric control device.
The utility model has the following advantages:
in the past, the front wheel and the rear wheel are positioned to penetrate through the section steel in a gap between the front wheel and the rear wheel, so that the position of the front wheel and the position of the rear wheel are inconvenient to adjust, and the section steel with different models is inconvenient to process. The utility model adopts the scheme that the first pushing device and the pressing wheel press the processed section steel on the pressure-bearing wheel, so that the utility model can be conveniently adapted to section steels of various types and is convenient for processing section steels of different types (sizes).
The lighting mechanism lights the section steel from the side lower part through a plurality of lighting lamps, the side surface of the section steel is lighted to have high brightness, and the top surface of the section steel is not directly lighted to have relatively obvious low brightness, so that the profile of the section steel is very clear and sharp in the images shot by the machine from top to bottom, the strict degree of visual identification on the environmental requirement is reduced to a certain extent, a better-quality and more conveniently-processed image is provided for subsequent image identification under the same brightness condition, and the accuracy degree of the visual identification is further improved,
the camera is positioned right above the downstream section steel path and the shooting direction of the camera is downward, so that the camera shoots an image which is a top view facing the section steel, the shot image has the best shooting angle compared with other shooting directions, and the shot image has the minimum deformation.
The setting of casing and cloth curtain or plastics curtain, on the one hand guarantee that the bending machine of shaped steel does not receive external debris influence (if there is the foreign matter to get into the bending machine of shaped steel chance and cause the influence to the normal operating of bending machine of shaped steel), on the other hand has reduced external light by a wide margin to measuring environment's influence, makes the light of crookedness measuring mechanism department come from crookedness measuring mechanism's each light basically, guarantees measuring effect. The cloth or plastic curtain and its opening are conventional devices and conventional structures, not shown.
In a word, the utility model integrally adopts visual detection and a new bending machine structure, further improves the visual detection structure and the bending machine structure, provides a product with moderate cost, moderate processing effect and precision, solves the problem that only high-end products and low-end products are available and middle-end products are lacked in the prior art, and compared with the prior visual detection structure, the profile steel in the shot image has clearer outline and higher recognition degree.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of the present invention with the housing removed;
fig. 3 is a schematic top view of the present invention with the housing removed.
Detailed Description
As shown in figures 1 to 3, the section steel bending mechanism based on visual measurement of the utility model comprises a section steel bending machine and a bending degree measuring mechanism positioned at the downstream direction of the section steel bending machine,
the curvature measuring mechanism comprises a camera mechanism and an illuminating mechanism; the advancing path of the section steel 2 at the downstream side of the workbench 1 is called a downstream section steel path, the camera mechanism comprises a portal frame 3 crossing the downstream section steel path, the top of the portal frame 3 is provided with a camera 4, the camera 4 is positioned right above the downstream section steel path, and the shooting direction of the camera 4 faces downwards;
the camera 4 is positioned directly above the downstream section steel path and the imaging direction thereof is directed downward, and the camera 4 is arranged to take an image of the section steel 2 in a plan view facing the section steel, and the taken image has an optimum imaging angle and a minimum amount of deformation compared to other imaging directions.
The illuminating mechanisms are provided with a plurality of sets, and the illuminating mechanisms are dispersedly arranged on two sides of the downstream section steel path; each illuminating mechanism has the same structure and comprises an illuminating bracket 5, and an illuminating lamp 6 (preferably a strip-shaped illuminating lamp) is arranged at the top end of the illuminating bracket 5;
the illuminating lamp 6 and the camera 4 are respectively connected with an electric control device 7 through lines, and the electric control device 7 is connected with a display screen; the display screen is conventional and not shown. The electric control device 7 is a PLC or an industrial control computer, and can be accessed to the original equipment by the equipment purchaser or can be purchased in a complete set with the utility model.
The illumination lamps 6 are lower than the height of the downstream section steel path (i.e., the actual transport height of the section steel 2 in operation).
The lighting mechanism lights the section steel 2 from the side lower part through the plurality of lighting lamps 6, the side surface of the section steel 2 is lighted to have high brightness, and meanwhile, the top surface of the section steel 2 is not directly lighted to have relatively obvious low brightness, so that the profile of the section steel 2 is very clear and sharp in the image shot by the machine from top to bottom, the strict degree of the visual identification on the environmental requirement is reduced to a certain degree, a better-quality and more conveniently-processed image is provided for the subsequent image identification under the same light condition, and the accuracy degree of the visual identification is further improved,
the section steel bending machine comprises a workbench 1, and the advancing direction of section steel 2 is the downstream direction;
a plurality of (preferably 4 groups of) pressing and conveying mechanisms for pressing the section steel 2 and conveying the section steel 2 are linearly arranged (preferably uniformly spaced) on the workbench 1 from the upstream to the downstream direction;
the pressing and conveying mechanism comprises a pressing device and a rotating and conveying device which are arranged in a one-to-one correspondence manner;
the rotary conveying device comprises a mounting frame 8, a driving motor 9 is arranged at the top of the mounting frame 8, and an output shaft of the driving motor 9 is downwards connected with a pressure bearing wheel 10 for driving the section steel 2 to move forwards;
the top pressing device comprises a first pushing device 11, an extension rod 12 of the first pushing device 11 faces a pressure bearing wheel 10 (the orientation means that the extension rod can be over against the pressure bearing wheel or can be staggered and opposite in the upstream direction and the downstream direction), a pressure applying wheel is installed at the end part of the extension rod 12 of the first pushing device 11 through a first installation seat 13 and used for pressing the processed section steel 2 on the pressure bearing wheel 10, and the processed section steel 2 is matched with the pressure bearing wheel 10 and the pressure applying wheel in a rolling and pressure welding manner; the first mounting seat 13 is disposed toward one end and both side walls of the section steel 2 to be open, and the pressure applying roller is hidden by the first mounting seat 13 in the drawing, and thus is not shown.
A second pushing device 14 is fixedly connected to the workbench 1 below the downstream of each pressing and conveying mechanism, the second pushing device 14 is provided with an extension rod 15, a pressing shaft is mounted at the end part of the extension rod 15 of the second pushing device 14 through a second mounting seat 16, the second mounting seat 16 faces one end of the section steel 2 and is provided with an opening on the side wall, and the pressing shaft is used for pressing and pressing the bent section steel 2; the extension direction of the extension bar 15 of the second pushing device 14 is perpendicular to the feeding direction of the section steel 2. The pressure shaft is hidden in the figure by the second mounting 16 and is therefore not shown. The installation structure of the pressing shaft on the extension rod is the same as that of the pressing wheel on the extension rod.
The first pushing device 11 and the second pushing device 14 are both working hydraulic cylinders or working electric push rods or working air cylinders;
each driving motor 9, the first pushing device 11 and the second pushing device 14 are respectively connected with the electric control device 7 through lines.
In the past, the front wheel and the rear wheel are positioned to penetrate through the section steel 2 in the gap between the front wheel and the rear wheel, the position adjustment of the front wheel and the rear wheel is inconvenient, and the section steel 2 of different models is very inconvenient to process. The utility model adopts the scheme that the first pushing device 11 and the pressing wheel press the processed section steel 2 on the bearing wheel 10, so the utility model can be conveniently adapted to section steels 2 of various types and is convenient for processing section steels 2 of different types (sizes).
The bending machine also comprises a shell 17, wherein the shell 17 encloses the section steel bending machine and the bending degree measuring mechanism;
an inlet 18 for the section steel 2 to enter is arranged at the upstream end of the shell 17, an outlet 19 for the section steel 2 to be sent out is arranged at the downstream end of the shell 17, a cloth curtain or a plastic curtain for shielding external light is respectively arranged at the outlet 19 and the inlet 18, and an opening for the section steel 2 to pass through is arranged on the cloth curtain or the plastic curtain.
The setting of casing 17 and cloth curtain or plastics curtain, on the one hand guarantee that the bending machine of shaped steel does not receive external debris influence (if there is the foreign matter to get into the bending machine of shaped steel chance and cause the influence to the normal operating of bending machine of shaped steel), on the other hand has reduced external light by a wide margin to measuring environment's influence, makes the light of crookedness measuring mechanism department come from crookedness measuring mechanism's each light 6 basically, guarantees measuring effect. The cloth or plastic curtain and its opening are conventional devices and conventional structures, not shown.
The illumination support 5 and the portal frame 3 both comprise telescopic support legs for adjusting the height, and the camera 4 is mounted at the top of the portal frame 3 through a universal holder; the electric control device 7 is mounted on the table 1, and a movable door for operating the electric control device 7 is mounted on the housing 17 corresponding to the electric control device 7. The movable door is conventional and not shown. Telescopic leg, universal cloud platform and dodge gate are current conventional device, and concrete structure is no longer repeated. The arrangement of the universal tripod head is convenient for adjusting the shooting angle of the camera 4, and particularly, when the field is uneven or needs to be replaced, the camera 4 can be adjusted to the optimal shooting angle under various conditions.
When the device works, the first pushing device 11 tightly presses the processed section steel on the bearing wheel 10, each driving motor 9 drives the bearing wheel 10 to rotate, and the bearing wheel 10 drives the section steel 2 to move towards the downstream direction under the action of friction force. Shaped steel 2 is when passing through second thrustor 14, receives second thrustor 14 through its connected last axle with shaped steel 2 bending, and the shaped steel after the bending passes through crookedness measuring mechanism, obtains the profile image after the processing of the sharp shaped steel of more clear in the past through shooing, provides good basis for image recognition shaped steel crookedness.
The principle of measuring the bending degree of the section steel is as follows: under the restraint of the pressing and conveying mechanism in the section steel bending machine, the positions of the section steel 2 passing through the section steel bending machine are the same, and at the downstream section steel path, the section steel 2 images with different curvatures are necessarily shot by the camera 4 corresponding to the section steel 2 with different curvatures, namely, the section steel 2 images shot by the camera 4 have a mapping relation corresponding to the section steel curvatures.
The photographing is a non-contact measurement, and after the information (the photographed picture) of the section steel 2 is obtained through the non-contact measurement, a person skilled in the art can obtain the profile of the section steel 2 through image recognition, and further obtain the bending degree of the section steel through image processing (or manual measurement on a screen). The utility model only provides a real-time profile steel 2 picture for a user in the processing process of the profile steel 2 and provides an equipment foundation for measuring the curvature of the profile steel in a real-time non-contact manner. The image processing is a mature technology and is not a part of the utility model, the product manufactured and sold by the utility model does not need to contain the electric control device 7 (if the buyer does not have the original electric control device 7, the utility model can be sold together with the electric control device 7), the user can automatically access the original electric control device 7 and debug, and the bending degree of the section steel is obtained through the image processing; the user can even directly measure the section steel 2 picture on the screen manually and obtain the section steel bending degree. In a word, the utility model can send the section steel 2 to a specific position (downstream section steel path) and shoot shadowless section steel 2 images, thereby providing equipment foundation for measuring the section steel bending degree in real time in a contactless manner and enabling the section steel 2 to reach the preset bending degree after being pressed and bent. One outstanding advantage of the utility model is that in the section steel 2 image, the outline brightness of the section steel 2 is obviously higher than that of the inside of the section steel 2 image (the top of the section steel 2), thereby providing a very favorable basis for image recognition.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the utility model and it is intended to cover in the claims the utility model as defined in the appended claims.
Claims (4)
1. The section steel bending mechanism based on vision measurement comprises a section steel bending machine and a vision-based curvature measuring mechanism positioned in the downstream direction of the section steel bending machine,
the method is characterized in that: the section steel bending machine comprises a workbench, and the advancing direction of the section steel is the downstream direction; a plurality of pressing and conveying mechanisms for pressing and conveying the section steel are linearly arranged on the workbench from the upstream to the downstream;
the pressing and conveying mechanism comprises a pressing device and a rotating and conveying device which are arranged in a one-to-one correspondence manner;
the rotary conveying device comprises an installation frame, a driving motor is arranged at the top of the installation frame, and an output shaft of the driving motor is downwards connected with a pressure bearing wheel for driving the section steel to advance;
the top pressing device comprises a first pushing device, an extension rod of the first pushing device faces the pressure bearing wheel, a pressure applying wheel is arranged at the end part of the extension rod of the first pushing device and used for pressing the processed section steel on the pressure bearing wheel, and the processed section steel is matched with the pressure bearing wheel and the pressure applying wheel in a rolling and pressing manner;
a second pushing device is fixedly connected to the workbench below the downstream of each pressing and conveying mechanism, each second pushing device is provided with an extension rod, and a pressing shaft is mounted at the end of each extension rod and used for jacking the bent section steel; the extension direction of an extension rod of the second pushing device is perpendicular to the feeding direction of the section steel, and the first pushing device and the second pushing device are both working hydraulic cylinders or working electric push rods or working air cylinders;
each driving motor, the first pushing device and the second pushing device are respectively connected with an electric control device through lines.
2. The section steel bending mechanism based on visual measurement according to claim 1, wherein: the curvature measuring mechanism comprises a camera mechanism and an illuminating mechanism; the method comprises the following steps that a forward path of the section steel on the downstream side of a workbench is called a downstream section steel path, a camera mechanism comprises a portal frame crossing the downstream section steel path, a camera is arranged at the top of the portal frame, the camera is positioned right above the downstream section steel path, and the shooting direction of the camera faces downwards;
the illuminating mechanisms are provided with a plurality of sets, and the illuminating mechanisms are dispersedly arranged on two sides of the downstream section steel path; each illuminating mechanism has the same structure and comprises an illuminating bracket, and an illuminating lamp is arranged at the top end of the illuminating bracket;
the illuminating lamp and the camera are respectively connected with an electric control device through lines, and the electric control device is connected with a display screen;
the lighting lamps are lower than the height of the downstream section steel path.
3. The section steel bending mechanism based on visual measurement according to claim 1 or 2, wherein: the bending machine is characterized by also comprising a shell, wherein the shell encloses the section steel bending machine and the bending degree measuring mechanism;
the shell upstream end is provided with an inlet for profile steel to enter, the shell downstream end is provided with an outlet for profile steel to be sent out, the outlet and the inlet are respectively provided with a cloth curtain or a plastic curtain for shielding external light, and the cloth curtain or the plastic curtain is provided with an opening for profile steel to pass through.
4. The section steel bending mechanism based on visual measurement according to claim 2, wherein: the lighting support and the portal frame both comprise telescopic support legs for adjusting the height, and the camera is mounted at the top of the portal frame through a universal cradle head; the electric control device is arranged on the workbench, and a movable door for operating the electric control device is arranged on the shell corresponding to the electric control device.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116499387A (en) * | 2023-04-21 | 2023-07-28 | 江苏普达迪泰科技有限公司 | Photographic measurement device for remote micro-deformation monitoring |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116499387A (en) * | 2023-04-21 | 2023-07-28 | 江苏普达迪泰科技有限公司 | Photographic measurement device for remote micro-deformation monitoring |
| CN116499387B (en) * | 2023-04-21 | 2024-01-05 | 江苏普达迪泰科技有限公司 | Photographic measurement device for remote micro-deformation monitoring |
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