Device availability intelligent management method and system based on digital calibration certificate

Abstract

The invention discloses an equipment availability intelligent management method and system based on a digital calibration certificate, and belongs to the technical field of measurement testing. The system comprises a digital calibration certificate server side, a digital calibration certificate authentication module, an intelligent gateway and an upper computer. A digital calibration certificate of measurement equipment is uploaded to a digital calibration certificate server side, and after the digital calibration certificate is authenticated, an upper computer accesses the digital calibration certificate to obtain equipment basic information, certificate release date and calibration result in the digital calibration certificate; in combination with the association information of the intelligent gateway port stored in the server side and the equipment use requirement, the management of the measurement equipment quantity value and the management of the product quality are highly fused in time and space, the permissibility of the equipment is judged, and the data transmission of the measurement equipment which does not meet the management requirement is forbidden or restricted. And limiting the access of the measurement equipment to the measurement network, and giving an alarm for the fault of the corresponding measurement equipment through the upper computer.

Description

Technical Field

[0001] The invention relates to an intelligent management method and system for equipment availability based on digital calibration certificates, belonging to the technical field of measurement and testing. Background Art

[0002] With the continuous upgrading and transformation of traditional manufacturing industry, in order to ensure the quality of products, the number of measuring equipment supporting the processing and manufacturing production line has increased dramatically, reaching tens of thousands or even hundreds of thousands. These measuring equipment covers different types of parameters such as geometric quantities, thermal quantities, mechanical quantities, and electrical quantities. The same type of equipment purchased by enterprises in different batches or even the same batch may involve different brands and models. From the management perspective, different types of equipment certificates often belong to different departments, which limits the flow of different types of data such as equipment measurement data, management data, and measurement data in the civil aircraft quality management system. Moreover, most of the existing equipment certificates exist in paper form. Although some certificates have been digitized, they are still limited to small-scale archiving. Even due to the lack of data storage and transmission means, some or even all data information is missing, presenting a "data island" trend, which limits the monitoring of the status of measuring equipment, the quality traceability of products, and the comprehensive performance analysis of production lines.

[0003] Certificates in XML format have been promoted and applied in digital calibration certificates because of their machine-readable advantages. By building digital certificates based on XML format, building a new equipment quality assurance method based on digital certificates, and building a "digital resume" for the entire life cycle of measurement equipment, we can empower the unstructured data cluster of measurement equipment and achieve physical efficiency improvement in enterprise management. Summary of the invention

[0004] The purpose of the present invention is to provide an intelligent management method and system for equipment availability based on digital calibration certificates, which fully utilizes the machine-readable advantage of data calibration certificates, achieves a high degree of integration of time and space between the management of measurement equipment values ​​and the management of product quality, and realizes the circulation of trusted measurement results in the digital world through a combination of software and hardware isolation, which is helpful for product quality management.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] The present invention discloses a method for intelligent management of equipment availability based on digital calibration certificates, comprising the following steps:

[0007] Step 1: The user unit sends the equipment used for measurement or inspection to the metrology agency for calibration and obtains the calibration certificate of the equipment. The calibration certificate includes a digital calibration certificate for machine reading and an electronic calibration certificate for human reading. The digital calibration certificate is in XML format, and the electronic calibration certificate is in PDF format. Both different types of certificates are credible and can be verified with each other.

[0008] Step 2: The user unit uploads the obtained digital calibration certificate and electronic calibration certificate to the digital calibration certificate server through the host computer, and the digital calibration certificate and electronic calibration certificate are stored locally on the server. Batch management of digital calibration certificates and electronic certificates is achieved through the host computer.

[0009] Step 3: Authenticate the digital calibration certificate of each measuring device through the server of the digital calibration certificate. The digital calibration certificate contains a digital signature for certificate verification. The validity of the digital calibration certificate is ensured by authenticating the digital signature.

[0010] Step 4: The digital calibration certificate host computer accesses the digital calibration certificate server, reads the digital calibration certificate of step 3, and extracts the measuring device information, the issuance date of the digital calibration certificate and the calibration result information in the digital calibration certificate to obtain the measuring device information in the device digital.

[0011] The information of the calibrated measuring device in step 4 is stored in the item under administrativeData, the manufacturer of the measuring device is stored in the manufacturer field of the digital calibration certificate, the model of the measuring device is stored in the model field of the digital calibration certificate, and the serial number of the measuring device is stored in the identifications field of the digital calibration certificate.

[0012] The issue date of the digital calibration certificate is stored in coreData under administrativeData, where the issue date of the certificate is stored in issueDate. The issue date of the certificate is combined with the calibration period of the measuring device to determine whether the measuring device is out of calibration period.

[0013] The calibration result information of the measuring device is stored in the measurementResults section of the digital calibration certificate and can be obtained by querying the results field. The measurement uncertainty is obtained through the uncertaintyValue field.

[0014] Step 5: Based on the measuring device information, the release date of the digital calibration certificate and the calibration result information in the device number extracted in step 4, with the help of the communication function between the intelligent gateway and different types of equipment, the specific information is associated with the measuring device, and it serves as a basis for judging whether the measuring device can access the measurement network and carry out measurement activities.

[0015] Step 5.1: Bind each port of the smart gateway to the manufacturer, model, specification and other information of the device. The specific association information is stored in the host computer. Combined with the measurement device information, the issuance date and calibration result information of the digital calibration certificate extracted in step 4, the association between the digital calibration certificate and the measurement device is realized.

[0016] Step 5.2: Time t of smart gateway g , Digital Calibration Certificate Server s The time is kept synchronized with the real time t r The date of issuance of the digital calibration certificate for a measuring device ii and the corresponding calibration period △t i In terms of r ≤t ii +△t i , the measuring device is in the calibration cycle; if t r >t ii +△t i The measuring device is out of calibration period.

[0017] Step 5.3: The host computer reads the maximum allowable error δ of a certain measuring device i , and the measurement uncertainty u is read in the digital calibration certificate of the device i For comparison, if u i >δ i This means that the measurement accuracy of the measuring equipment no longer meets the measurement requirements. i ≤δ i ; Extract the error information of each measuring point in the calibration result information of the digital calibration certificate θ ik , if the measuring device is within the full range of θ ik ≤δ i This means that the measurement accuracy of the measuring equipment meets the measurement requirements. If the measurement points θ within the full range of the measuring equipment ik >δ i This means that measurement results within a certain range of the measuring device are not available.

[0018] Step 6: If the validity period of the calibration certificate of the measuring device exceeds the validity period, or the measuring device is within the validity period of the calibration certificate but the measurement uncertainty of the calibration result exceeds the maximum allowable error of the measuring device, the measuring device is determined to be disabled.

[0019] If the measuring equipment is within the validity period of the calibration certificate, the measurement uncertainty of the calibration result is less than or equal to the maximum allowable error of the measuring equipment, and the errors of some measuring points are greater than the maximum allowable error, the equipment is restricted from use.

[0020] If the measuring equipment is within the validity period of the calibration certificate, the measurement uncertainty of the calibration result is less than or equal to the maximum allowable error of the measuring equipment, and the error of each measuring point is less than the maximum allowable error, the equipment can be used.

[0021] Step 7: If the host computer determines that the measuring device is disabled, the intelligent gateway will disconnect the data transmission between the measuring device and the host computer of the measurement system, restricting the measuring device from accessing the measurement network. At the same time, an alarm will be issued through the host computer to remind the operator that the measuring device does not meet the measurement requirements.

[0022] If the host computer determines that the measuring equipment is restricted, the intelligent gateway will limit the range of restricted use of the measuring equipment. The measurement results in this section cannot be transmitted to the host computer, and an alarm will be issued through the host computer.

[0023] If the host computer determines that the measuring device is allowed to be used, the measuring device can be normally connected to the host computer of the inspection and testing or experimental system.

[0024] The invention discloses an intelligent management system for equipment availability based on digital calibration certificates, which is used to implement the intelligent management method for equipment availability based on digital calibration certificates. An intelligent management system for equipment availability based on digital calibration certificates comprises a digital calibration certificate server, a digital calibration certificate authentication module, an intelligent gateway and a host computer.

[0025] The digital calibration certificate server is mainly used to support the basic functions of the digital calibration certificate. The basic functions of the digital calibration certificate include importing, storing, opening and authenticating the digital certificate.

[0026] The digital calibration certificate authentication module is mainly used to realize the authentication of the digital calibration certificate and determine the authenticity of the digital calibration certificate itself.

[0027] The intelligent gateway is mainly used for the transmission and control of measurement data and the reading of key information of the digital calibration certificate. The intelligent gateway is connected to the measuring equipment through different interfaces such as BNC and network port. Each channel is associated with the brand, model and number of the measuring equipment, and the relevant information is stored in the host computer. The intelligent gateway is connected to the digital calibration certificate host computer, and the on and off of the intelligent gateway can be controlled by the intelligent judgment of the host computer.

[0028] The host computer is mainly used to extract key information fields of the digital calibration certificate of the measuring equipment, match the digital calibration certificate with the measuring equipment, authenticate the digital calibration certificate, and realize the basic functions of the digital calibration certificate. The basic functions of the digital calibration certificate include storage, opening, reading, deletion, and viewing.

[0029] Beneficial effects:

[0030] 1. The present invention discloses an intelligent management method and system for equipment availability based on digital calibration certificates. Based on the advantage of machine readability of digital calibration certificates, the present invention realizes automatic extraction of basic equipment information, certificate issuance information, and calibration result information in XML format certificates, thereby overcoming the shortcoming that key information of traditional paper certificates and electronic certificates needs to be manually extracted, and greatly improving work efficiency.

[0031] 2. The present invention discloses an intelligent management method and system for equipment availability based on digital calibration certificates, which adopts a method for automatically associating digital calibration certificates with channels of measuring equipment. By reading basic information of the equipment in the digital calibration certificate, it automatically matches the pre-defined channels of the equipment in the intelligent gateway, thereby reducing labor costs.

[0032] 3. The present invention discloses an intelligent management method and system for equipment availability based on digital calibration certificates, which adopts a method for determining the access of measuring equipment. By combining the performance degradation of the measuring equipment during the calibration period and whether the measuring equipment meets the measurement requirements, the prior information is integrated with the information contained in the digital carrier to determine whether the equipment meets the conditions for connecting to the measurement network.

[0033] 4. The present invention discloses an intelligent management method and system for equipment availability based on digital calibration certificates, which constructs criteria for judging whether measuring equipment is disabled. Through intelligent management of measuring equipment access, if any one of the judgment conditions is not met, the intelligent gateway will disable or limit the data transmission function between the measuring equipment and the host computer of the measuring system, and issue an alarm to the user. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A flow chart of a method for intelligent management of equipment availability based on digital calibration certificates disclosed in the present invention;

[0035] Figure 2 It is the criterion for determining the management of equipment usage. DETAILED DESCRIPTION

[0036] In order to better illustrate the purpose and advantages of the present invention, the invention is further described below with reference to the accompanying drawings and examples.

[0037] Embodiment 1:

[0038] The embodiment discloses an intelligent management system for equipment availability based on a digital calibration certificate, including a digital calibration certificate server, a certificate authentication module, an intelligent gateway, a measurement equipment terminal, and a measurement host computer.

[0039] The digital calibration certificate server is mainly used to realize batch management of equipment digital calibration certificates, and realizes batch import, download, delete, view and other functions of digital calibration certificates through the host computer.

[0040] The certificate authentication module is mainly used to realize the authentication of the digital calibration certificate and determine the authenticity of the digital calibration certificate itself.

[0041] The intelligent gateway is mainly used for the transmission and control of measurement data, reading of key information of digital calibration certificates, etc. The intelligent gateway is connected to the measuring equipment through different interfaces such as BNC and network port. Each channel is associated with the brand, model and number of the measuring equipment, and the relevant information is stored locally in the intelligent gateway.

[0042] The intelligent gateway is connected to the device management server to access the device digital calibration certificate.

[0043] The intelligent gateway is connected to a measurement host computer to realize the transmission of measurement data during product inspection and testing or a test process, and the host computer realizes comprehensive analysis and processing of the measurement data.

[0044] The measuring equipment is mainly used for measuring key physical quantities in product inspection and testing or test processes, and can convert parameters such as geometric quantities, mechanical quantities, thermal quantities, etc. into electrical signals.

[0045] The measurement host computer is mainly used to realize the functions of collecting, processing and comprehensive analysis of measurement data of the measurement equipment.

[0046] This embodiment discloses a method for intelligently managing device availability based on a digital calibration certificate, and the specific implementation steps are as follows:

[0047] Step 1: The user unit sends the equipment used for measurement or inspection to the metrology agency for calibration and obtains the calibration certificate of the equipment. The calibration certificate includes a digital calibration certificate for machine reading and an electronic calibration certificate for human reading. The digital calibration certificate is in XML format, and the electronic calibration certificate is in PDF format. Both different types of certificates are credible and can be verified with each other.

[0048] Step 2: The user unit uploads the obtained digital calibration certificate and electronic calibration certificate to the digital calibration certificate server through the host computer, and the digital calibration certificate and electronic calibration certificate are stored locally on the server. Batch management of digital calibration certificates and electronic certificates is achieved through the host computer.

[0049] Step 3: Authenticate the digital calibration certificate of each measuring device through the server of the digital calibration certificate. The digital calibration certificate contains a digital signature for certificate verification. The validity of the digital calibration certificate is ensured by authenticating the digital signature.

[0050] Step 4: The digital calibration certificate host computer accesses the digital calibration certificate server, reads the digital calibration certificate of step 3, and extracts the measuring device information, the issuance date of the digital calibration certificate and the calibration result information in the digital calibration certificate to obtain the measuring device information in the device digital.

[0051] The information of the calibrated measuring device in step 4 is stored in the item under administrativeData, the manufacturer of the measuring device is stored in the manufacturer field of the digital calibration certificate, the model of the measuring device is stored in the model field of the digital calibration certificate, and the serial number of the measuring device is stored in the identifications field of the digital calibration certificate.

[0052] The issue date of the digital calibration certificate is stored in coreData under administrativeData, where the issue date of the certificate is stored in issueDate. The issue date of the certificate is combined with the calibration period of the measuring device to determine whether the measuring device is out of calibration period.

[0053] The calibration result information of the measuring device is stored in the measurementResults section of the digital calibration certificate and can be obtained by querying the results field. The measurement uncertainty is obtained through the uncertaintyValue field.

[0054] Step 5: Based on the measuring device information, the release date of the digital calibration certificate and the calibration result information in the device number extracted in step 4, with the help of the communication function between the intelligent gateway and different types of equipment, the specific information is associated with the measuring device, and it serves as a basis for judging whether the measuring device can access the measurement network and carry out measurement activities.

[0055] Step 5.1: Bind each port of the smart gateway to the manufacturer, model, specification and other information of the device. The specific association information is stored in the host computer. Combined with the measurement device information, the issuance date and calibration result information of the digital calibration certificate extracted in step 4, the association between the digital calibration certificate and the measurement device is realized.

[0056] Step 5.2: Time t of smart gateway g , Digital Calibration Certificate Server s The time is kept synchronized with the real time t rThe date of issuance of the digital calibration certificate for a measuring device ii and the corresponding calibration period △t i In terms of r ≤t ii +△t i , the measuring device is in the calibration cycle; if t r >t ii +△t i The measuring device is out of calibration period.

[0057] Step 5.3: The host computer reads the maximum allowable error δ of a certain measuring device i , and the measurement uncertainty u is read in the digital calibration certificate of the device i For comparison, if u i >δ i This means that the measurement accuracy of the measuring equipment no longer meets the measurement requirements. i ≤δ i ; Extract the error information of each measuring point in the calibration result information of the digital calibration certificate θ ik , if the measuring device is within the full range of θ ik ≤δ i This means that the measurement accuracy of the measuring equipment meets the measurement requirements. If the measurement points θ within the full range of the measuring equipment ik >δ i This means that measurement results within a certain range of the measuring device are not available.

[0058] Step 6: If the validity period of the calibration certificate of the measuring device exceeds the validity period, or the measuring device is within the validity period of the calibration certificate but the measurement uncertainty of the calibration result exceeds the maximum allowable error of the measuring device, the measuring device is determined to be disabled.

[0059] If the measuring equipment is within the validity period of the calibration certificate, the measurement uncertainty of the calibration result is less than or equal to the maximum allowable error of the measuring equipment, and the errors of some measuring points are greater than the maximum allowable error, the equipment is restricted from use.

[0060] If the measuring equipment is within the validity period of the calibration certificate, the measurement uncertainty of the calibration result is less than or equal to the maximum allowable error of the measuring equipment, and the error of each measuring point is less than the maximum allowable error, the equipment can be used.

[0061] Step 7: If the host computer determines that the measuring device is disabled, the intelligent gateway will disconnect the data transmission between the measuring device and the host computer of the measurement system, restricting the measuring device from accessing the measurement network. At the same time, an alarm will be issued through the host computer to remind the operator that the measuring device does not meet the measurement requirements.

[0062] If the host computer determines that the measuring equipment is restricted, the intelligent gateway will limit the range of restricted use of the measuring equipment. The measurement results in this section cannot be transmitted to the host computer, and an alarm will be issued through the host computer.

[0063] If the host computer determines that the measuring device is allowed to be used, the measuring device can be normally connected to the host computer of the inspection and testing or experimental system.

[0064] Embodiment 2:

[0065] The embodiment discloses an intelligent management system for equipment availability based on a digital calibration certificate, which is mainly composed of a digital calibration certificate server, a digital calibration certificate authentication module, an intelligent gateway and a digital calibration certificate host computer.

[0066] The digital calibration certificate server is mainly used to support the basic functions of the digital calibration certificate, such as the import, storage, opening, and authentication of the digital certificate.

[0067] The digital calibration certificate authentication module is mainly used to realize the authentication of the digital calibration certificate and determine the authenticity of the digital calibration certificate itself.

[0068] The intelligent gateway is mainly used for the transmission and control of measurement data and the reading of key information of the digital calibration certificate. The intelligent gateway is connected to the measuring equipment through different interfaces such as BNC and network port. Each channel is associated with the brand, model and number of the measuring equipment, and the relevant information is stored in the host computer. The intelligent gateway is connected to the digital calibration certificate host computer, and the on and off of the intelligent gateway can be controlled by the intelligent judgment of the host computer.

[0069] The host computer is mainly used to extract key information fields of the digital calibration certificate of the measuring equipment, match the digital calibration certificate with the measuring equipment, authenticate the digital calibration certificate, and realize the basic functions of the digital calibration certificate (storage, opening, reading, deleting, viewing, etc.).

[0070] This embodiment discloses a method for intelligently managing device availability based on a digital calibration certificate, and the specific implementation steps are as follows:

[0071] Step 1. The user unit sends the equipment used for measurement or inspection to the metrology agency for calibration and obtains the calibration certificate of the measuring equipment. The calibration certificate contains a digital calibration certificate for machine reading and an electronic calibration certificate for human reading. The digital calibration certificate adopts XML format, and the electronic calibration certificate adopts PDF format. The digital calibration certificate mainly provides key data elements for the intelligent judgment of the host computer, breaking the data island problem generated in the application process of traditional electronic certificates and paper certificates. Both different types of certificates are credible and can be verified with each other.

[0072] Step 2: The user unit uploads the obtained digital calibration certificate and electronic calibration certificate to the digital calibration certificate server through the host computer, and the digital calibration certificate and electronic calibration certificate are stored locally on the server. The host computer can realize batch management of digital calibration certificates and electronic certificates, mainly including batch deletion, saving, reading, etc. of different types of certificates. Both different types of certificates do not support editing.

[0073] Step 3: Authenticate the digital calibration certificate of each measuring device through the server of the digital calibration certificate. The digital calibration certificate contains a digital signature for certificate verification. The validity of the digital calibration certificate is ensured by authenticating the digital signature.

[0074] When authenticating the digital signature of a digital calibration certificate, the operator uses the metrology agency's public key to decrypt the digital signature and obtain a digital summary. The original data is processed using the same hash algorithm as the sender to generate a new digital summary. The decrypted summary is compared with the newly generated summary. If the two are the same, it means that the original data has not been tampered with during transmission and is indeed from the sender; if they are different, it means that the data may have been tampered with or the signature is invalid.

[0075] If the digital calibration certificate can pass the digital signature authentication, it can be used for subsequent reading operations of the host computer. If the digital calibration certificate cannot pass the signature authentication, it means that the device may have been tampered with during the transmission process. The certificate to be used needs to be isolated and the operator needs to be reminded to further verify the validity of the digital calibration certificate.

[0076] Step 4: The digital calibration certificate host computer accesses the digital calibration certificate server, queries the digital calibration certificate stored on the server, and extracts the device information, time information, and calibration result information in the digital calibration.

[0077] Furthermore, since the architecture of the digital calibration certificate adopts a tree structure, the information of the calibrated device is stored in the item under the administrative data administrativeData, the manufacturer of the measuring device is stored in the manufacturer field of the digital calibration certificate, the model of the device is stored in the model field of the digital calibration certificate, and the serial number of the device is stored in the identifications field of the digital calibration certificate.

[0078] Furthermore, the time information includes the receiving date, calibration date, and certificate issuance date of the measuring device. The time information is stored in coreData under administrativeData, where the certificate issuance date is stored in issueDate. The certificate issuance date is combined with the calibration period of the measuring device to determine whether the measuring device exceeds the calibration period.

[0079] Furthermore, the calibration result information of the measuring device is stored in the measurement result measurementResults part of the digital calibration certificate, which can be obtained by querying the results field. The measurement uncertainty can be obtained through the uncertaintyValue field.

[0080] The extracted information is further stored in the form of data pairs, the specific form is as follows:

[0081] {(m a1 ,m o1 ,i d1 ,i s1 ,m e1 ,u1),(m a2 ,m o2 ,i d2 ,i s2 ,m e2 ,u2),…,(m ai ,m oi ,i di ,i si ,m ei ,u i ),…,(m an ,m on ,i dn ,i sn ,m en ,u n )}

[0082] Among them, m ai The manufacturer information of the i-th measuring device, the data type is string;

[0083] m oi is the model information of the i-th measuring device, and the data type is a string;

[0084] i di is the serial number information of the i-th measuring device, and the data type is a string;

[0085] i si The date of issuance of the calibration certificate of the i-th measuring device, the data type is string;

[0086] m ei is the calibration result of the i-th measuring device, and the data type is in the form of data pairs (m i ,m s ), m i and m s are the measured value and standard value during the calibration process respectively;

[0087] u iIt is the uncertainty information of the i-th measuring device, and the data type is numeric.

[0088] Step 5: Based on the measuring device information, the release date of the digital calibration certificate and the calibration result information in the device number extracted in step 4, with the help of the communication function between the intelligent gateway and different types of equipment, the specific information is associated with the measuring device, and it serves as a basis for judging whether the measuring device can access the measurement network and carry out measurement activities.

[0089] 5.1. Each port of the intelligent gateway is bound to the manufacturer, model, specification and other information of the device, and the specific associated information is stored in the host computer in the form of data pairs.

[0090] {(m ar1 ,m or1 ,i dr1 ,p r1 ,△t1,δ1),(m ar2 ,m or2 ,i dr2 ,p r2 ,△t2,δ2),…,(m ari ,m ori ,i dri ,p ri ,△t i ,δ i ),…,(m arn ,m orn ,i drn ,p rn ,△t n ,δ n )}

[0091] Among them, m ari The manufacturer information of the device connected to the i-th port of the smart gateway, the data type is a string;

[0092] m ori The model information of the device connected to the i-th port of the smart gateway, the data type is a string;

[0093] i dri The serial number information of the device connected to the i-th port of the smart gateway, the data type is a string;

[0094] p ri The port information of the device connected to the i-th port of the smart gateway, the data type is a string;

[0095] △t i It is the calibration period of the device connected to the i-th port of the smart gateway, and the data type is a string;

[0096] δ iThe maximum allowable error of the device connected to the i-th port of the smart gateway, the data type is a string;

[0097] Combined with the measurement equipment information, the issuance date of the digital calibration certificate and the calibration result information (m ai ,m oi ,i di ,i si ,m ei ,u i ) Device information connected to each port of the smart gateway (m ari ,m ori ,i dri ,p ri ,△t i ,δ i ) for association analysis, if the above information (m ai ,m oi ,i di ) and (m ari ,m ori ,i dri ) are completely consistent, the information in the digital calibration certificate can be associated with the information of the devices connected to each port of the smart gateway.

[0098] Furthermore, the availability of the measuring equipment is mainly judged by three aspects, namely: (1) whether the validity period of the digital calibration certificate is within the calibration period; (2) whether the measurement uncertainty of the digital calibration certificate is less than or equal to the maximum allowable error of the equipment; and (3) whether the measurement error of each measuring point in the digital calibration certificate is less than or equal to the maximum allowable error of the equipment.

[0099] 5.2. Time t of smart gateway g , Digital Calibration Certificate Server s The time is kept synchronized with the real time t r The date of issuance of the digital calibration certificate for a measuring device ii and the corresponding calibration period △t i In terms of r ≤t ii +△t i , the measuring device is in the calibration cycle; if t r >t ii +△t i The measuring device is out of calibration period.

[0100] 5.3. The host computer reads the maximum allowable error δ of a certain measuring device i , and the measurement uncertainty u is read in the digital calibration certificate of the device i For comparison, if u i >δi This means that the measurement accuracy of the measuring equipment no longer meets the measurement requirements. i ≤δ i ; Extract the error information of each measuring point in the calibration result information of the digital calibration certificate θ ik , if the measuring device is within the full range of θ ik ≤δ i This means that the measurement accuracy of the measuring equipment meets the measurement requirements. If the measurement points θ within the full range of the measuring equipment ik >δ i This means that measurement results within a certain range of the measuring device are not available.

[0101] Step 6: If the validity period of the calibration certificate of the measuring device exceeds the validity period, or the measuring device is within the validity period of the calibration certificate but the measurement uncertainty of the calibration result exceeds the maximum allowable error of the measuring device, the measuring device is determined to be disabled.

[0102] If the measuring equipment is within the validity period of the calibration certificate, the measurement uncertainty of the calibration result is less than or equal to the maximum allowable error of the measuring equipment, and the errors of some measuring points are greater than the maximum allowable error, the equipment is restricted from use.

[0103] If the measuring equipment is within the validity period of the calibration certificate, the measurement uncertainty of the calibration result is less than or equal to the maximum allowable error of the measuring equipment, and the error of each measuring point is less than the maximum allowable error, the equipment can be used.

[0104] Step 7: If the host computer determines that the measuring device is disabled, the intelligent gateway will disconnect the data transmission between the measuring device and the host computer of the measurement system, and the measurement results of the measuring device cannot be transmitted to the host computer. At the same time, the host computer will issue an alarm to remind the operator that the measuring device does not meet the measurement requirements and that the measuring device needs to be inspected weekly, recalibrated and the measurement confirmation is completed before the measurement data can be transmitted again.

[0105] If the host computer determines that the measuring equipment is restricted, the intelligent gateway will limit the range of restricted use of the measuring equipment. The measurement results in this section cannot be transmitted to the host computer, and an alarm will be issued through the host computer.

[0106] If the host computer determines that the measuring equipment is allowed to be used, the measuring equipment can be normally connected to the host computer of the inspection and testing or experimental system.

[0107] The specific description above further illustrates the purpose, technical solutions and beneficial effects of the invention in detail. It should be understood that the above is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for intelligent management of equipment availability based on digital calibration certificates, characterized in that: The following steps are involved: Step 1: The user unit sends the equipment used for measurement or inspection to the metrology agency for calibration and obtains the calibration certificate of the equipment; The calibration certificate includes a digital calibration certificate for machine reading and an electronic calibration certificate for human reading; the digital calibration certificate adopts XML format, and the electronic calibration certificate adopts PDF format; both different types of certificates are credible and can be mutually verified; Step 2: The user unit uploads the obtained digital calibration certificate and electronic calibration certificate to the digital calibration certificate server through the host computer, and the digital calibration certificate and electronic calibration certificate are stored locally on the server; Batch management of digital calibration certificates and electronic certificates can be achieved through the host computer; Step 3: Authenticate the digital calibration certificate of each measuring device through the server of the digital calibration certificate. The digital calibration certificate contains a digital signature for certificate verification. The validity of the digital calibration certificate is ensured by authenticating the digital signature. Step 4: The digital calibration certificate host computer accesses the digital calibration certificate server, reads the digital calibration certificate in step 3, and extracts the measuring device information, the issuance date of the digital calibration certificate, and the calibration result information in the digital calibration certificate to obtain the measuring device information in the device number; Step 5: Based on the measuring device information, the release date of the digital calibration certificate and the calibration result information in the device number extracted in step 4, the specific information is associated with the measuring device by means of the communication function between the intelligent gateway and different types of devices, and serves as a basis for judging whether the measuring device can access the measurement network and carry out measurement activities; Step 6: If the measuring device exceeds the validity period of the calibration certificate or the measuring device is within the validity period of the calibration certificate but the measurement uncertainty of the calibration result exceeds the maximum allowable error of the measuring device, it is determined that the measuring device is disabled; If the measuring equipment is within the validity period of the calibration certificate, the measurement uncertainty of the calibration result is less than or equal to the maximum allowable error of the measuring equipment, and the errors of some measuring points are greater than the maximum allowable error, the equipment is restricted; If the measuring equipment is within the validity period of the calibration certificate, the measurement uncertainty of the calibration result is less than or equal to the maximum allowable error of the measuring equipment, and the error of each measuring point is less than the maximum allowable error, the equipment can be used; Step 7: If the host computer determines that the measuring device is disabled, the intelligent gateway will disconnect the data transmission between the measuring device and the host computer of the measurement system, restricting the measuring device from accessing the measurement network; at the same time, an alarm will be issued through the host computer to remind the operator that the measuring device does not meet the measurement requirements; If the host computer determines that the measuring equipment is restricted, the intelligent gateway will restrict the use of the measuring equipment to a certain range. The measurement results in this range cannot be transmitted to the host computer, and an alarm will be issued through the host computer. If the host computer determines that the measuring device is allowed to be used, the measuring device can be normally connected to the host computer of the inspection and testing or experimental system.

2. The method for intelligently managing equipment availability based on digital calibration certificates according to claim 1, characterized in that: The information of the calibrated measuring device in step 4 is stored in the item under administrativeData, the manufacturer of the measuring device is stored in the manufacturer field of the digital calibration certificate, the model of the measuring device is stored in the model field of the digital calibration certificate, and the serial number of the measuring device is stored in the identifications field of the digital calibration certificate; The issuance date of the digital calibration certificate is stored in coreData under administrativeData, where the issuance date of the certificate is stored in issueDate; the issuance date of the certificate is combined with the calibration period of the measuring device to determine whether the measuring device is out of calibration period; The calibration result information of the measuring device is stored in the measurement result measurementResults part of the digital calibration certificate, which can be obtained by querying the results field; the measurement uncertainty is obtained through the uncertaintyValue field.

3. The method for intelligently managing equipment availability based on digital calibration certificates as claimed in claim 2, characterized in that: Step 5 is implemented as follows: Step 5.1, each port of the intelligent gateway is bound to the manufacturer, model, and specification of the device, and the specific association information is stored in the host computer. Combined with the measurement device information, the issuance date of the digital calibration certificate, and the calibration result information in the digital calibration certificate extracted in step 4, the association between the digital calibration certificate and the measurement device is realized; Step 5.2: Time t of smart gateway g , Digital Calibration Certificate Server s The time is kept synchronized with the real time t r Remain consistent; the date of issue of the digital calibration certificate for a particular measuring device ii and the corresponding calibration period △t i , if t r ≤t ii +△t i , the measuring device is in the calibration cycle; if t r >t ii +△t i The measuring device is out of calibration period; Step 5.3: The host computer reads the maximum allowable error δ of a certain measuring device i , and the measurement uncertainty u is read in the digital calibration certificate of the device i For comparison, if u i >δ i This means that the measurement accuracy of the measuring equipment no longer meets the measurement requirements. i ≤δ i , extract the error information of each measuring point in the calibration result information of the digital calibration certificate θ ik , if the measuring device is within the full range of θ ik ≤δ i This means that the measurement accuracy of the measuring equipment meets the measurement requirements. If the measurement points θ within the full range of the measuring equipment ik >δ i This means that measurement results within a certain range of the measuring device are not available.

4. An intelligent management system for equipment availability based on digital calibration certificates, used to implement an intelligent management method for equipment availability based on digital calibration certificates as claimed in claim 1, 2 or 3, characterized in that: It includes a digital calibration certificate server, a digital calibration certificate authentication module, an intelligent gateway and a host computer; The digital calibration certificate server is mainly used to support the basic functions of the digital calibration certificate, which include importing, storing, opening and authenticating the digital certificate; The digital calibration certificate authentication module is mainly used to realize the authentication of the digital calibration certificate and determine the authenticity of the digital calibration certificate itself; The intelligent gateway is mainly used for the transmission and control of measurement data and the reading of key information of digital calibration certificates; the intelligent gateway is connected to the measurement equipment through different interfaces such as BNC and network port, each channel is associated with the brand, model and number of the measurement equipment, and the relevant information is stored in the host computer; The intelligent gateway is connected to the digital calibration certificate host computer, and the on and off of the intelligent gateway is controlled by the intelligent judgment of the host computer; The host computer is mainly used to extract key information fields of the digital calibration certificate of the measuring equipment, match the digital calibration certificate with the measuring equipment, authenticate the digital calibration certificate, and realize the basic functions of the digital calibration certificate; The basic functions of the digital calibration certificate include storage, opening, reading, deletion and viewing.

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