Abstract: The present application relates to the technical field of computers, and discloses a communication monitoring method, apparatus and system. One specific embodiment of the method includes: obtaining, in response to establishment of a communication connection between two communication nodes, traffic data related to the communication connection; extracting node feature information from the traffic data; evaluating a comprehensive score of the communication connection based on the node feature information and a preset evaluation strategy matched with the communication connection; and determining whether the comprehensive score meets a preset communication security condition matched with the communication connection: if yes, determining that the communication connection is secure; otherwise, determining that the communication connection is risky. The embodiment can effectively improve the accuracy of a monitoring result, thereby effectively improving the communication security.

Abstract: Provided are a method and apparatus for managing a digital certificate. A specific implementation of the method includes: receiving a digital certificate generation request sent by a user; according to a digital certificate application scenario, determining a preset threshold value corresponding to the digital certificate application scenario; broadcasting first user information to a blockchain, to enable a blockchain node, which knows an aggregated public key corresponding to the threshold value, to sign the first user information by using a private key component of the blockchain node, so as to generate first signature information, where the aggregated public key corresponding to the threshold value is generated by means of aggregating public key components of the blockchain node on the basis of a signature generation algorithm; and aggregating the first signature information to generate a digital certificate for the user.

Abstract: Disclosed is a grinding roller for waste tires and a multifunctional crusher having the grinding roller. The grinding roller comprises a roll shaft and a plurality of grinding components. The grinding components each comprise a grinding frame and grinding blocks mounted in grooves of the grinding frame. Each grinding block has a grinding surface that protrudes with respect to the grooves. Axial interval adjusting rings are disposed on the ring shaft for separating the grinding components at a predetermined distance to cut waste tires into blocks. The crusher comprises a box for housing the grinding roller. The box is provided with a material inlet and a material outlet. Axial blockers are mounted on the crusher to help grind waste tires into fine powder.

Abstract: Disclosed is a grinding roller for waste tires and a multifunctional crusher having the grinding roller. The grinding roller comprises a roll shaft and a plurality of grinding components. The grinding components each comprise a grinding frame and grinding blocks mounted in grooves of the grinding frame. Each grinding block has a grinding surface that protrudes with respect to the grooves. Axial interval adjusting rings are disposed on the ring shaft for separating the grinding components at a predetermined distance to cut waste tires into blocks. The crusher comprises a box for housing the grinding roller. The box is provided with a material inlet and a material outlet. Axial blockers are mounted on the crusher to help grind waste tires into fine powder.

Abstract: A crushing device for a waste tire and a multi-functional crusher therewith are provided. The crushing device includes a main shaft, a roll shaft main body fixedly arranged on the main shaft, and roll shaft blockers arranged at two axial ends of the main shaft; crushing components are arranged on the roll shaft main body; a plurality of roll shaft convex bodies are arranged on a periphery of the roll shaft main body along a circumferential direction; a roll shaft groove is formed between each two adjacent roll shaft convex bodies; the crushing components include tools, axial interval adjusting blocks and/or radial supporting blocks; a tool groove, corresponding to the roll shaft convex body, is provided at a bottom of each tool; and an axial interval adjusting block groove, corresponding to the roll shaft convex body, is provided on each axial interval adjusting block.

Abstract: A crushing device for a waste tire and a multi-functional crusher therewith are provided. The crushing device includes a main shaft, a roll shaft main body fixedly arranged on the main shaft, and roll shaft blockers arranged at two axial ends of the main shaft; crushing components are arranged on the roll shaft main body; a plurality of roll shaft convex bodies are arranged on a periphery of the roll shaft main body along a circumferential direction; a roll shaft groove is formed between each two adjacent roll shaft convex bodies; the crushing components include tools, axial interval adjusting to blocks and/or radial supporting blocks; a tool groove, corresponding to the roll shaft convex body, is provided at a bottom of each tool; and an axial interval adjusting block groove, corresponding to the roll shaft convex body, is provided on each axial interval adjusting block.