Abstract: A lost circulation detection device includes a first detection member and a second detection member, a first signal transmitter and a first signal receiver are disposed on the first detection member, and the first signal transmitter transmits a signal along an axial direction of a rockshaft so that the first signal receiver acquires data information of drilling fluid in the axial direction of the rockshaft; a fluid channel penetrating through the second detection member is disposed in the second detection member, and the fluid channel is configurable to be in communication with the rockshaft; a second signal transmitter and a second signal receiver are disposed oppositely on two sides of the fluid channel, and the second signal transmitter transmits a signal along a center line of a second accommodating groove, so that the second signal receiver acquires data information of drilling fluid in a circumferential direction of the rockshaft.

Abstract: An application method of a Bluetooth low-energy electronic lock based on built-in offline pairing passwords, an interactive unlocking method of a Bluetooth electronic lock, and an electronic lock system are provided, wherein data propagation of some public keys or public addresses is carried out through a scanning response packet of a broadcast packet, the mobile phone APPs run in a Bluetooth server mode, the Bluetooth electronic lock works in a Bluetooth client mode, the Bluetooth electronic lock periodically sends a broadcast packet of a random address, and the Bluetooth electronic lock has a set of temporary door-opening passwords of random algorithm built in after manufacture; and during the initialization process, the Bluetooth electronic lock uploads the built-in temporary door-opening password set, with the random algorithm, through the relational data of application services and the public address of the Bluetooth electronic lock.

Abstract: Provided are a method of achieving free-pairing wireless door lock based on DIP switch, a wireless door lock and a communication method for the wireless door lock. The method of achieving free-pairing wireless door lock based on DIP switch specifically includes: step 1, selecting for a wireless door lock a wireless chip which supports data modulation, wherein a data field of a transmission packet includes a lock address bit field and an area code field; step 2, providing, a built-in multi-bit DIP switch for the wireless door lock in terms of hardware, in which case the multi-bit DIP switch is directly connected with an input pin of the central processing unit of the wireless door lock; step 3, installing an embedded software in central processing unit of the wireless door lock; and step 4, matching a DIP switch address with a room number during installation of the wireless door lock.

Abstract: An application method of a Bluetooth low-energy electronic lock based on built-in offline pairing passwords, an interactive unlocking method of a Bluetooth electronic lock, and an electronic lock system are provided, wherein data propagation of some public keys or public addresses is carried out through a scanning response packet of a broadcast packet, the mobile phone APPs run in a Bluetooth server mode, the Bluetooth electronic lock works in a Bluetooth client mode, the Bluetooth electronic lock periodically sends a broadcast packet of a random address, and the Bluetooth electronic lock has a set of temporary door-opening passwords of random algorithm built in after manufacture; and during the initialization process, the Bluetooth electronic lock uploads the built-in temporary door-opening password set, with the random algorithm, through the relational data of application services and the public address of the Bluetooth electronic lock.

Abstract: Provided are a method of achieving free-pairing wireless door lock based on DIP switch, a wireless door lock and a communication method for the wireless door lock. The method of achieving free-pairing wireless door lock based on DIP switch specifically includes: step 1, selecting for a wireless door lock a wireless chip which supports data modulation, wherein a data field of a transmission packet includes a lock address bit field and an area code field; step 2, providing, a built-in multi-bit DIP switch for the wireless door lock in terms of hardware, in which case the multi-bit DIP switch is directly connected with an input pin of the central processing unit of the wireless door lock; step 3, installing an embedded software in central processing unit of the wireless door lock; and step 4, matching a DIP switch address with a room number during installation of the wireless door lock.