A conveyor chain online monitoring device and monitoring method

Abstract

The application discloses a conveyor chain online monitoring device and a monitoring method, the online monitoring device comprises a conveyor box, a chain is arranged in the conveyor box, the chain comprises a plurality of chain links, adjacent chain links are connected through chain shafts, an observation hole is arranged on the conveyor box, a light source is arranged on one side of the conveyor box, image acquisition components are arranged on both sides of the light source, the image acquisition components are in communication connection with an industrial computer, the light source is used for projecting light to the running chain through the observation hole, the image acquisition components are used for collecting images of adjacent chain shafts through the observation hole and sending processed image signals to the industrial computer, and the industrial computer is used for calculating the distance between adjacent chain shafts according to the image signals sent by the two image acquisition components. Thus, the application can monitor the running state of the chain and give a warning when the chain link is abnormal.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of conveyor online monitoring, and particularly relates to a conveyor chain online monitoring device and a monitoring method. BACKGROUND

[0002] In the activated carbon flue gas purification system, the device for conveying activated carbon is a conveyor. During daily use, it is found that the pin shaft and sleeve of the chain are generally severely worn. Since the conveyor chain is relatively high in cost and has not reached the service life, the main maintenance mode during daily use of the conveyor chain is to replace part of the chain section with severe wear after short-term shutdown, so as to reduce the equipment cost and maintenance cost of the overall chain replacement. Figure 1 Fig. 1 is a top view of the structure of the conveyor chain, Figure 2 Fig. 2 is a front view of the structure of the conveyor chain. Figure 1

[0003] Since the running state and environmental physical state of the chain in the conveyor box cannot be monitored by manual operation during daily operation of the conveyor, the chain breakage fault cannot be accurately predicted and prepared in advance. SUMMARY

[0004] In order to solve the defects in the prior art, the present application provides a conveyor chain online monitoring device and a monitoring method, which can monitor the running state of the chain.

[0005] The technical scheme adopted by the present application to solve the technical problems is as follows:

[0006] A conveyor chain online monitoring device, comprising a conveyor box, wherein the conveyor box is provided with a chain inside, the chain comprises a plurality of chain sections, adjacent chain sections are connected through chain shafts, the conveyor box is provided with an observation hole, one side of the conveyor box is provided with a light source, the light source is provided with an image acquisition component on both sides, the image acquisition component is in communication connection with an industrial computer, the light source is used for projecting light to the running chain through the observation hole, the image acquisition component is used for acquiring the image of adjacent chain shafts through the observation hole and sending the processed image signal to the industrial computer, and the industrial computer is used for calculating the distance between adjacent chain shafts according to the image signals sent by the two image acquisition components, and then monitoring the running state of the chain.

[0007] Further, the industrial computer is used for comparing the calculated distance between adjacent chain shafts with the standard distance between adjacent chain shafts, and if the calculated distance between adjacent chain shafts is greater than the standard distance between adjacent chain shafts, the industrial computer is used for sending a warning signal that the chain section corresponding to the adjacent chain shaft is abnormal.

[0008] ​Further, the light source is used to project light to the adjacent chain shafts reaching the designated position through the observation hole, the light projected on the adjacent chain shafts is deformed by the chain shaft end circle modulation, the image acquisition component is used to acquire the elliptical image of the adjacent chain shafts after deformation through the observation hole, and the conversion matrix is obtained by processing the elliptical image and sent to the industrial computer, the industrial computer is used to extract the contour point set of the adjacent chain shafts according to the conversion matrix sent by each image acquisition component, and the center pixel coordinates of the adjacent chain shafts are fitted, and the industrial computer is used to analyze the center pixel coordinates of the adjacent chain shafts fitted by the conversion matrix sent by each image acquisition component, and the center three-dimensional coordinates of the adjacent chain shafts are obtained, and the industrial computer is used to calculate the distance between the adjacent chain shafts according to the center three-dimensional coordinates of the adjacent chain shafts.

[0009] Further, the light source is a laser module, the image acquisition component is a camera, the laser module is located at the middle position between the two cameras, the center line of the two cameras is consistent with the conveying direction of the chain, and the laser module faces the observation hole.

[0010] Further, the laser module is in communication connection with the industrial computer, the laser module is used to send the intensity signal of the projected linear laser to the industrial computer, and the industrial computer is used to analyze the received intensity signal of the linear laser and adjust the intensity of the linear laser projected by the laser module.

[0011] Further, the camera is calibrated by the grid calibration plate arranged in the field of view of the camera.

[0012] Further, the laser module and the camera are fixed on the base, and the tripod is fixed at the lower end of the base.

[0013] Further, the target is arranged on each chain shaft end face, the camera is used to acquire the image of the target on the corresponding chain shaft through the observation hole and send the processed target image signal to the industrial computer, and the industrial computer is used to decode the value carried by the corresponding target according to the corresponding target image signal, number the corresponding chain shaft, and further number the corresponding chain link.

[0014] A conveyor chain online monitoring method is monitored by using the conveyor chain online monitoring device, including the following steps:

[0015] S1, in the running process of the chain, the light source projects light to the adjacent chain shafts reaching the designated position through the observation hole, and the image acquisition component acquires the image of the adjacent chain shafts through the observation hole and processes it, and sends the processed image signal to the industrial computer;

[0016] S2, the industrial computer calculates the distance between the adjacent chain shafts according to the image signals sent by the two image acquisition components, and further monitors the chain running state.

[0017] Further, before step S1, the following step is further included: before monitoring the chain, a grid calibration plate is placed in front of a laser module, the laser module projects linear laser on the grid calibration plate, two cameras acquire images of the grid calibration plate and process the images, and the processed image signals are sent to the industrial computer, the industrial computer determines that the two cameras have completely captured the images of the grid calibration plate according to the image signals sent by the two cameras, appropriately changes the position of the grid calibration plate, repeatedly acquires several groups of grid calibration plate images, and calibrates the camera parameters.

[0018] Compared with the prior art, the beneficial effects of the present application are:

[0019] The conveyor chain online monitoring device of the present application comprises a conveyor box body, a chain is arranged in the conveyor box body, the chain comprises a plurality of chain links, adjacent chain links are connected through chain shafts, an observation hole is arranged on the conveyor box body, a light source is arranged on one side of the conveyor box body, image acquisition components are arranged on both sides of the light source, and the image acquisition components are in communication connection with an industrial computer; in this way, during the running of the chain, the light source projects light onto the adjacent chain shafts at the specified position through the observation hole, the image acquisition components acquire images of the adjacent chain shafts through the observation hole and process the images, and the processed image signals are sent to the industrial computer, the industrial computer calculates the distance between the adjacent chain shafts according to the image signals sent by the two image acquisition components, and thus the industrial computer can calculate the distance between the corresponding two adjacent chain shafts when every two adjacent chain shafts on the chain run to the position of the light source, the industrial computer can calculate the distance between all adjacent chain shafts on the chain after the chain runs one round, and the running state of the chain can be monitored.

[0020] In the present application, the industrial computer is used to compare the calculated distance between the adjacent chain shafts with the standard distance between the adjacent chain shafts, if the calculated distance between the adjacent chain shafts is greater than the standard distance between the adjacent chain shafts, the industrial computer is used to send a warning signal that the chain link corresponding to the adjacent chain shafts is abnormal; thus, the warning can be given when the chain link is abnormal, and further, the repair plan and maintenance scheme can be made in advance before the chain fails, so as to avoid long-time failure downtime caused by sudden chain rupture.

[0021] In the present application, the light source is used to project light to the adjacent chain shaft reaching the designated position through the observation hole, the light projected on the adjacent chain shaft is modulated by the chain shaft end circle to generate deformation, the image acquisition component is used to acquire the elliptical image after deformation of the light projected on the adjacent chain shaft through the observation hole, and the conversion matrix is obtained by processing the elliptical image and sent to the industrial computer, the industrial computer is used to extract the contour point set of the adjacent chain shaft according to the conversion matrix sent by each image acquisition component, and the center pixel coordinates of the adjacent chain shaft are fitted, and the industrial computer is used to analyze the center pixel coordinates of the adjacent chain shaft fitted by the conversion matrix sent by each image acquisition component, and the center three-dimensional coordinates of the adjacent chain shaft are obtained, and the industrial computer is used to calculate the distance between the adjacent chain shafts according to the center three-dimensional coordinates of the adjacent chain shafts; therefore, the distance between the adjacent chain shafts can be accurately calculated.

[0022] In the present application, each chain shaft end face is provided with a target, and the camera is used to acquire the image of the target on the corresponding chain shaft through the observation hole and send the processed target image signal to the industrial computer, and the industrial computer is used to decode the value carried by the corresponding target according to the corresponding target image signal, and number the corresponding chain shaft, and then number the corresponding chain link; in this way, each chain link can be numbered, so that the specific position of the chain can be accurately pointed out while monitoring the running status of the chain and warning hidden dangers.

[0023] In summary, the present application can continuously monitor the running status of the chain without manual interruption under the condition that the conveyor is working normally, and can timely and accurately monitor and warn the running status of the chain when the distance between the adjacent chain shafts changes due to slight deformation and slight hidden cracks of the chain link, so that the maintenance and repair plan can be planned in advance when the safety hidden danger occurs, a series of losses caused by sudden chain breaking events can be avoided from the source, the number of repeated maintenance which has no effect can be reduced, and the labor cost can be saved. The implementation of the present application not only fills the gap of the activated carbon material conveying system fault handling technology, but also can be applied and popularized in other similar fields. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a schematic view of the front structure of the conveyor chain in the background art;

[0025] Figure 2 It is a schematic view of the top structure of the conveyor chain in the background art; Figure 1

[0026] Figure 3 It is a schematic view of the three-dimensional structure of the present application;

[0027] Figure 4 It is a schematic view of camera parameter calibration;

[0028] Figure 5 ​The schematic diagram for the connection of the camera, the laser module and the industrial computer is shown in the figure.

[0029] Figure 6 The flow chart for obtaining the three-dimensional coordinates of the chain shaft center is shown in the figure.

[0030] Figure 7 The image schematic diagram of the linear laser projected by the laser module onto the chain shaft is shown in the figure.

[0031] Figure 8 The schematic diagram for the industrial computer to extract the contour point set of the chain shaft ellipse image is shown in the figure.

[0032] Figure 9 The schematic diagram for the industrial computer to fit the center point of the chain shaft ellipse image is shown in the figure.

[0033] Figure 10 The flow chart for the conveyor chain online monitoring is shown in the figure.

[0034] The figure shows the figure mark description: 1, chain, 2, chain link, 3, chain shaft, 4, laser module, 5, camera, 6, grid calibration board, 7, base, 8, tripod. DETAILED DESCRIPTION

[0035] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings. These embodiments are only used to illustrate the present application, and are not limiting to the present application.

[0036] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are only for description purposes and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] In addition, in the description of the present application, unless otherwise specified, the meaning of "multiple" is two or more.

[0039] As shown in Figure 3 and 5 A conveyor chain online monitoring device, comprising a conveyor box, a chain 1 is arranged in the conveyor box, the chain 1 comprises a plurality of chain links 2, adjacent chain links 2 are connected through chain shafts 3, an observation hole is arranged on the conveyor box, a light source is arranged on one side of the conveyor box, image acquisition components are arranged on both sides of the light source, the image acquisition components are communicatively connected with an industrial computer, the light source is used for projecting light to the running chain 1 through the observation hole, the image acquisition components are used for collecting images of adjacent chain shafts 3 through the observation hole and sending processed image signals to the industrial computer, and the industrial computer is used for calculating the distance between adjacent chain shafts 3 according to the image signals sent by the two image acquisition components. In this way, when every two adjacent chain shafts 3 on the chain 1 run to the position of the light source, the industrial computer can calculate the distance between the corresponding two adjacent chain shafts 3, and after the chain 1 runs a circle, the industrial computer can calculate the distance between all adjacent chain shafts 3 on the chain 1, so that the running state of the chain 1 can be monitored.

[0040] The industrial computer is used for comparing the calculated distance between adjacent chain shafts 3 with the standard distance between adjacent chain shafts 3, if the calculated distance between adjacent chain shafts 3 is greater than the standard distance between adjacent chain shafts 3, the industrial computer is used for sending a warning signal that the chain link 2 corresponding to the adjacent chain shaft 3 is abnormal; therefore, the warning can be given when the chain link 2 is abnormal, and further, the repair plan and maintenance scheme can be made in advance before the chain 1 fails, so that the long-time failure shutdown caused by sudden breakage of the chain 1 can be avoided.

[0041] The light source is used for projecting light to the adjacent chain shaft 3 reaching the specified position through the observation hole, the light projected on the adjacent chain shaft 3 is modulated by the end part of the chain shaft 3 to generate deformation, the image acquisition component is used for collecting the deformed elliptical image projected on the adjacent chain shaft 3 through the observation hole, and the elliptical image is processed to obtain a conversion matrix and send to the industrial computer, the industrial computer is used for extracting the contour point set of the adjacent chain shaft 3 according to the conversion matrix sent by each image acquisition component, and fitting to obtain the center pixel coordinates of the adjacent chain shaft 3, and the industrial computer is used for analyzing the center pixel coordinates of the adjacent chain shaft 3 fitted by the conversion matrix sent by each image acquisition component to obtain the three-dimensional coordinates of the center of the adjacent chain shaft 3, and the industrial computer is used for calculating the distance between the adjacent chain shafts 3 according to the three-dimensional coordinates of the center of the adjacent chain shaft 3; therefore, the distance between the adjacent chain shafts 3 can be accurately calculated.

[0042] The light source is used for projecting light to the adjacent chain shaft 3 reaching the specified position through the observation hole, the light projected on the adjacent chain shaft 3 is modulated by the end part of the chain shaft 3 to generate deformation, the image acquisition component is used for collecting the deformed elliptical image projected on the adjacent chain shaft 3 through the observation hole, and the elliptical image is processed to obtain a conversion matrix and send to the industrial computer, the industrial computer is used for extracting the contour point set of the adjacent chain shaft 3 according to the conversion matrix sent by each image acquisition component, and fitting to obtain the center pixel coordinates of the adjacent chain shaft 3, and the industrial computer is used for analyzing the center pixel coordinates of the adjacent chain shaft 3 fitted by the conversion matrix sent by each image acquisition component to obtain the three-dimensional coordinates of the center of the adjacent chain shaft 3, and the industrial computer is used for calculating the distance between the adjacent chain shafts 3 according to the three-dimensional coordinates of the center of the adjacent chain shaft 3; therefore, the distance between the adjacent chain shafts 3 can be accurately calculated. Figure 3As shown, the light source is a laser module 4, and the image acquisition component is a camera 5. The laser module 4 is located in the middle between the two cameras 5. The line connecting the centers of the two cameras 5 is consistent with the transmission direction of the chain 1. The laser module 4 faces the observation hole. Both the laser module 4 and the camera 5 are fixed on the base 7. A tripod 8 is fixed at the lower end of the base 7. The tripod 8 can be height adjusted. The camera 5 is calibrated by a grid calibration plate 6 set in the field of view of the camera 5.

[0043] Among them, such as Figure 5 As shown, the laser module 4 is connected to the industrial control computer. The laser module 4 is used to send the intensity signal of the projected linear laser to the industrial control computer. The industrial control computer is used to analyze the intensity signal of the received linear laser and adjust the intensity of the linear laser projected by the laser module 4. Therefore, the industrial control computer can adjust the intensity of the linear laser projected by the laser module 4, thereby improving the quality of the image of the chain shaft 3 acquired by the camera 5.

[0044] Each chain shaft 3 has a target on its end face. The camera 5 is used to collect images of the targets on the corresponding chain shaft 3 through the observation hole and send the processed target image signals to the industrial control computer. The industrial control computer is used to decode the values ​​carried by the corresponding targets according to the corresponding target image signals, number the corresponding chain shaft 3, and then number the corresponding chain link 2. This allows each chain link 2 to be numbered, so that the specific location of the chain 1 can be accurately pointed out while monitoring the operation status of the chain 1 and warning of potential hazards.

[0045] A method for online monitoring of a conveyor chain, using the aforementioned online monitoring device for the conveyor chain, includes the following steps:

[0046] S1. Calibration of camera 5 parameters: such as Figure 4 As shown, before monitoring chain 1, a grid calibration plate 6 is placed in front of the laser module 4, with the distance between the camera 5 and the grid calibration plate 6 controlled between 0.6-1m. The laser module 4 projects a linear laser onto the grid calibration plate 6. The two cameras 5 acquire and process images of the grid calibration plate 6, and send the processed image signals to the industrial control computer. Based on the image signals sent by the two cameras 5, the industrial control computer determines that both cameras 5 have completely captured images of the grid calibration plate 6. The position of the grid calibration plate 6 is then appropriately changed, and several sets of images of the grid calibration plate 6 are repeatedly acquired to calibrate the parameters of the camera 5. Figure 4 In the diagram, A represents the starting position of the grid calibration plate 6, and B represents the position of the grid calibration plate 6 after appropriate adjustments within the field of view of the camera 5.

[0047] S2, determination of the installation position of the base 7: after the calibration is completed, remove the grid calibration plate 6, and set the laser module 4 and the two cameras 5 fixed on the base 7 at a position outside the conveyor box body, wherein the laser module 4 is opposite to the observation hole, the distance between the camera 5 and the observation hole is controlled to be between 0.6-1m, during the running of the chain 1, the laser module 4 projects linear laser to the adjacent chain shaft 3 reaching the specified position through the observation hole, the camera 5 collects the image of the adjacent chain shaft 3 through the observation hole and processes it, and sends the processed image signal to the industrial computer, the industrial computer calculates the distance between the adjacent chain shaft 3 according to the image signal sent by the two cameras 5, and compares it with the standard distance between the adjacent chain shaft 3, if the error is within 1mm, the installation position of the base 7 is fixed, if the error is more than 1mm, the installation position of the base 7 is adjusted, and the step is repeated until the error is within 1mm;

[0048] S3, calculation of the distance between the chain shafts 3: as shown in Figure 10 , during the running of the chain 1, the laser module 4 projects linear laser to the adjacent chain shaft 3 reaching the specified position through the observation hole, as shown in Figure 7 , the linear laser projected on the adjacent chain shaft 3 is deformed by the end circle of the chain shaft 3, the camera 5 collects the deformed elliptical image projected on the adjacent chain shaft 3 through the observation hole, and processes the elliptical image to obtain a conversion matrix and sends it to the industrial computer, the industrial computer extracts the contour point set of the adjacent chain shaft 3 according to the conversion matrix sent by each camera 5, as shown in Figure 8 , and fits to obtain the center pixel coordinates of the adjacent chain shaft 3, as shown in Figure 9 , and the industrial computer analyzes the center pixel coordinates of the adjacent chain shaft 3 fitted by the conversion matrix sent by each camera 5 to obtain the three-dimensional coordinates of the center of the adjacent chain shaft 3, and the industrial computer calculates the distance between the adjacent chain shafts 3 according to the three-dimensional coordinates of the center of the adjacent chain shaft 3, and the industrial computer generates a chain 1 parameter report according to the calculated distance between all adjacent chain shafts 3, and further monitors the running status of the chain 1;

[0049] S4, early warning when the chain link 2 is abnormal: the industrial computer compares the calculated distance between the adjacent chain shafts 3 with the standard distance between the adjacent chain shafts 3, if the calculated distance between the adjacent chain shafts 3 is greater than the standard distance between the adjacent chain shafts 3, the industrial computer sends a warning signal that the chain link 2 corresponding to the adjacent chain shaft 3 is abnormal.

[0050] The laser module 4 projects linear laser to the adjacent chain shaft 3, which can enhance the elliptical image features of the adjacent chain shaft 3 collected by the camera 5, that is, the setting of the laser module 4 between the two cameras 5 can overcome the influence of the working environment on the imaging quality of the camera 5, and at the same time, the blowing device can be used to blow the chain 1 before the camera 5 collects the image, so as to ensure the imaging quality of the camera 5, thereby solving the influence of dust in the working environment on the image of the chain shaft 3.

[0051] The camera 5 parameter calibration operation is not necessary every time the chain 1 is monitored, and according to experience, the camera 5 parameter is calibrated once every 2-3 months.

[0052] The laser module 4 projects linear laser to the adjacent chain shaft 3 through the observation hole, specifically, the camera 5 collects the image of the chain 1 through the observation hole, and by means of the semantic segmentation and target recognition capability of the neural network, the chain shaft 3 with obvious geometric features is tracked and positioned in real time, when the adjacent chain shaft 3 reaches the specified position, that is, the chain link 2 corresponding to the adjacent chain shaft 3 is at the middle position of the two cameras 5, the camera 5 sends a signal to the industrial computer, and the industrial computer controls the laser module 4 to project linear laser to the adjacent chain shaft 3, as shown in Figure 6 .

[0053] The industrial computer compares the calculated distance between the adjacent chain shafts 3 with the standard distance between the adjacent chain shafts 3 and combines historical data, so as to early warn the deformation, hidden cracks and other hidden dangers of the chain link 2.

[0054] In summary, the present application can continuously monitor the running state of the chain 1 without interruption and without manual intervention under the normal working condition of the conveyor, and can timely find the change of the distance between the adjacent chain shafts 3 caused by the slight deformation and slight hidden cracks of the chain link 2, so as to timely and accurately monitor and early warn the running state of the chain 1, and further make repair plan and maintenance scheme in advance before the chain 1 fails, avoid long-time failure shutdown caused by sudden chain breakage, avoid a series of losses caused by sudden chain breakage from the source, reduce the number of repeated maintenance which has no effect, and save labor cost; the conveyor chain online monitoring device of the present application can monitor and measure the chain 1 in real time, generate overall chain 1 parameter report information, and technical personnel can diagnose the use condition of the conveyor through the chain 1 parameter report information, record the distance monitoring data between all adjacent chain shafts 3 in the whole chain 1 online, analyze the online data of the chain 1, obtain early warning conclusion, and the measurement error is within 1mm.

[0055] The above merely describes the preferred embodiments of the present application, and it should be pointed out that, for those skilled in the art, several improvements and replacements can be made without departing from the technical principles of the present application, and these improvements and replacements should also be considered as the protection scope of the present application.

Claims

1. An online monitoring device for a conveyor chain, comprising a conveyor housing, wherein a chain (1) is provided inside the conveyor housing, the chain (1) comprising a plurality of chain links (2), adjacent chain links (2) being connected by chain shafts (3), characterized in that: The conveyor housing is provided with an observation hole, and a light source is provided on one side of the conveyor housing. Image acquisition components are provided on both sides of the light source. The image acquisition components are connected to the industrial control computer. The light source is used to project light onto the running chain (1) through the observation hole. The image acquisition components are used to acquire images of adjacent chain shafts (3) through the observation hole and send the processed image signals to the industrial control computer. The industrial control computer is used to calculate the distance between adjacent chain shafts (3) based on the image signals sent by the two image acquisition components, and then monitor the running status of the chain (1). The light source is used to project light through the observation hole onto the adjacent chain shaft (3) that has reached the designated position. The light projected onto the adjacent chain shaft (3) is deformed by the end circle of the chain shaft (3). The image acquisition component is used to acquire the elliptical image projected onto the adjacent chain shaft (3) after deformation through the observation hole, and to process the elliptical image to obtain a transformation matrix and send it to the industrial control computer. The industrial control computer is used to extract the contour point set of the adjacent chain shaft (3) according to the transformation matrix sent by each image acquisition component, and to fit the center pixel coordinates of the adjacent chain shaft (3). The industrial control computer is used to analyze the center pixel coordinates of the adjacent chain shaft (3) obtained by fitting the transformation matrix sent by each image acquisition component to obtain the three-dimensional coordinates of the center of the adjacent chain shaft (3). The industrial control computer is used to calculate the distance between the adjacent chain shafts (3) according to the three-dimensional coordinates of the center of the adjacent chain shaft (3). Each of the chain shafts (3) has a target on its end face. The image acquisition component is used to acquire the image of the target on the corresponding chain shaft (3) through the observation hole and send the processed target image signal to the industrial control computer. The industrial control computer is used to decode the value carried by the target according to the target image signal, number the corresponding chain shaft (3), and then number the corresponding chain link (2).

2. The online monitoring device for a conveyor chain according to claim 1, characterized in that: The industrial control computer is used to compare the calculated spacing between adjacent chain shafts (3) with the standard spacing between adjacent chain shafts (3). If the calculated spacing between adjacent chain shafts (3) is greater than the standard spacing between adjacent chain shafts (3), the industrial control computer is used to issue an early warning signal that the chain link (2) corresponding to the adjacent chain shaft (3) is abnormal.

3. The online monitoring device for a conveyor chain according to claim 2, characterized in that: The light source is a laser module (4), the image acquisition component is a camera (5), the laser module (4) is located in the middle between the two cameras (5), the line connecting the centers of the two cameras (5) is consistent with the transmission direction of the chain (1), and the laser module (4) is facing the observation hole.

4. The online monitoring device for a conveyor chain according to claim 3, characterized in that: The laser module (4) is connected to the industrial control computer. The laser module (4) is used to send the intensity signal of the projected linear laser to the industrial control computer. The industrial control computer is used to analyze the intensity signal of the received linear laser and adjust the intensity of the linear laser projected by the laser module (4).

5. The online monitoring device for a conveyor chain according to claim 3, characterized in that: The camera (5) is calibrated by a grid calibration plate (6) set in the field of view of the camera (5).

6. The online monitoring device for a conveyor chain according to claim 3, characterized in that: The laser module (4) and the camera (5) are both fixed on the base (7), and a tripod (8) is fixed at the lower end of the base (7).

7. A method for online monitoring of a conveyor chain, comprising using the online monitoring device for the conveyor chain as described in any one of claims 1-6, characterized in that... Includes the following steps: S1. During the operation of the chain (1), the light source projects light through the observation hole to the adjacent chain shaft (3) that has reached the designated position. The image acquisition component acquires the image of the adjacent chain shaft (3) through the observation hole and processes it, and sends the processed image signal to the industrial control computer. S2. The industrial control computer calculates the distance between adjacent chain shafts (3) based on the image signals sent by the two image acquisition components, and then monitors the running status of the chain (1).

8. The method for online monitoring of a conveyor chain according to claim 7, characterized in that: Before step S1, the following steps are also included: Before monitoring the chain (1), a grid calibration plate (6) is placed in front of the laser module (4). The laser module (4) projects a linear laser onto the grid calibration plate (6). Two cameras (5) collect images of the grid calibration plate (6) and process them, and send the processed image signals to the industrial control computer. The industrial control computer determines that both cameras (5) have completely captured images of the grid calibration plate (6) based on the image signals sent by the two cameras (5). The position of the grid calibration plate (6) is appropriately changed, and several sets of grid calibration plate (6) images are repeatedly collected to calibrate the parameters of the cameras (5).

Images