37results about How to "Simple and reliable work" patented technology

The invention provides an equipment cabinet. The equipment cabinet comprises a box body, an environment temperature inductor, a temperature controller and a semiconductor refrigeration system, wherein the environment temperature inductor, the temperature controller and the semiconductor refrigeration system are installed in the box body, and when the temperature detected by the environment temperature inductor reaches or exceeds a temperature value set by the temperature controller, the semiconductor refrigeration system starts to generate cold air in the box body. The working principle of the semiconductor refrigeration system is safe, reliable, simple and easy to achieve.

The utility model discloses a simple and reliable pre-bias load starting circuit for a direct current (DC) converter, consisting of a switching tube Q1, a transistor Q2, a resistor R1 and a resistor R2 and a capacitor C1 and a capacitor C2, a diode D1 and a DC power VCC. The circuit utilizes the current control characteristic of the transistor Q2 to detect the voltage difference of the input voltage and the output pre-bias load voltage of the converter, and controls the turnon and turnoff of the switching tube Q1 according to the voltage difference, thus realizing soft start of the pre-bias load circuit. Simultaneously, the optimization of the pre-bias load starting circuit can be realized by selecting the parameters of R1, C1, R2 and C2 reasonably. The pre-bias load starting circuit can effectively solve the problems of output voltage waveform overshooting, restarting and even damaging module and the like occurring in the starting process of the output pre-bias voltage, and can be widely applied to the starting circuit that is used for the DC converter and has the pre-bias load.

The invention discloses a puncture gas guide pressure relief valve for a soft pack power battery, which comprises a ring cover, a connecting ring, a ring body, a gas check valve, a waterproof breathable membrane, a ring cover and a puncture part; one end of the connecting ring and One end of the ring cover is fixedly connected, and the other end extends into the ring body and is interference fit with the ring body; the piercing part is fixed at the other end of the ring body; The wall body of the body is fixedly connected, and the end with a larger diameter of the ring cover is fixedly connected with the outer package of the soft pack power battery, and the puncture part is contained in the ring cover; and the ring cover, the connecting ring, the ring body, and the ring cover are coaxially arranged; The waterproof and breathable membrane is arranged in the ring body; the gas one-way valve is arranged in the ring cover to prevent external air from entering the pouch battery. The invention greatly reduces the risk of liquid leakage from the soft pack power battery after the internal pressure of the power battery increases, and improves the use safety of the power battery.

Disclosed is a spring-type power failure restoration temperature control switch capable of controlling two kinds of circuits. The temperature control switch comprises a metal shell, two connection terminals and a metal end cap fixed to the metal shell, a ceramic guide frame heating element arranged between the metal end cap and the metal shell, a ceramic push rod movably and penetratingly arranged on the ceramic guide frame heating element, a bimetallic strip in contact with the ceramic push rod, a movable spring provided with a movable contact and a static contact piece provided with a static contact. When the temperature of loads reaches a set value, the bimetallic strip is heated to kick, the movable contact and the static contact are separated to open the circuits, and the ceramic guide frame heating element is energized to emit heat so as to enable the bimetallic strip and the temperature control switch circuit to be kept under the disconnected state. The bimetallic strip can restore only by deenergization so as to enable the temperature control switch circuit to be closed, and the ceramic guide frame heating element circuit is opened. The temperature control switch can control two kinds of load circuits at the same time and has power failure protection and power failure restoration functions.

The invention discloses a large-specification bearing dismounting and mounting device capable of improving the dismounting and mounting efficiency. The large-specification bearing dismounting and mounting device comprises main beams, a force application device, an auxiliary beam, vertical plates and base frames. The vertical plates are arranged on the two sides of the base frames. The vertical plates are inserted into through grooves of vertical columns of the base frames, and the vertical plates are in clearance fit with the through grooves. The main beams are arranged at the two ends of the vertical plates respectively. The auxiliary beam is arranged on the vertical plates and between the main beams and the base frames. The force application device is arranged on the side face, close to the auxiliary beam, of one main beam, wherein the bottom of the force application device and the side face of the main beam are in support fit. The main beams and the auxiliary beam are inserted into rectangular holes of the vertical plates respectively, and the main beams and the auxiliary beam are in clearance fit with the rectangular holes. The structure in which the beams and a hydraulic jack are matched is adopted, bearings are reversely ejected out through thrust of the hydraulic jack, and a shaft is pushed out from the rear end of a roller through the thrust of the hydraulic jack. The large-specification bearing dismounting and mounting device is simple in structure, convenient to use, reliable in work, high in universality and capable of improving the dismounting and mounting efficiency of large-specification bearings conveniently.

The invention discloses a talkback device and an interlayer device and system for building paging. The talkback device comprises a command signal generating unit, a data drive output unit and an extension set picking and hanging up detection unit, wherein the command signal generating unit is used for generating a plurality of square signals with different periods; the data drive output unit is connected with the command signal generating unit and is used for sending the square signals; and the extension set picking and hanging up detection unit is respectively connected with the command signal generating unit and the data drive output unit and is used for detecting the working state of the talkback device and controlling the on-off of the data drive output unit according to the current working state. According to the invention, a CPU (central processing unit) component is not needed, the device cost is reduced, the corresponding software cost is reduced, the development difficulty is reduced, and the maintenance cost after sale is reduced as far as possible.

The invention discloses a crawler crane mast lifting hydraulic control system and method and belongs to the technical field of crawler cranes. The control system comprises a jacking oil cylinder, a balanced valve, a pump pressure adjusting module, a hydraulic pump, a main amplitude winding control system and a controller, further comprises a main commutation module, a pressure sensor, an angle sensor and a control switch, wherein the main commutation module comprises a first electromagnetic directional valve, a second electromagnetic directional valve and an overflow valve. The system can integrate a secondary pressure adjusting module in the main reversal valve group, the quantity of valve blocks is small, the system structure and pipeline arrangement are simple, an oil source does not need to be controlled separately, and the operation is simple and reliable; low pressure-high pressure-low pressure control method is adopted, the working pressure of the jacking oil cylinder is reduced in the case of a long stroke, and the accident that the oil cylinder is bent is avoided; the phenomena the pressure over control of the jacking oil cylinder is too large and the mast is bent are effectively avoided, meanwhile, the automatic control is adopted, and the working strength is reduced; and a control switch is adopted for operation outside a control room, and the control system is safer and reliable.