30results about How to "Reduce the chance of burning out" patented technology

The invention belongs to the technical field of cables, and particularly relates to a separation-type lightning protection cable. The separation-type lightning protection cable comprises electric units, an inner jacket, an armoring layer, an outer jacket and a grounding layer; the inner jacket sleeves outside a first protective layer, a second protective layer is arranged outside the inner jacket, the grounding layer is arranged outside the second protective layer, the armoring layer is arranged outside the grounding layer, and the outer jacket is arranged outside the armoring layer; the first / second protective layer is made of a mica tape; and the separation-type lightning protection cable is characterized in that a position fixing element is arranged in the first protective layer, the position fixing element has a plurality of storage holes which are not communicated with each other, the electric units are distributed in the storage holes, and each storage hole is only provided with one electric unit; each storage hole is provided with an opening which is arranged on the edge of the position fixing element, and the electric unit can stretch into the storage hole or be taken out from the storage hole through the opening; besides the opening position, the edge of the position fixing element is positioned on the same cylindrical surface. The separation-type lightning protection cable has the beneficial effects that simplicity in production is realized, the production speed is high, the resistance rate of the grounding layer is low and the maintenance cost is low; the electric power still can be normally transmitted when the cable is provided with high load or struck by the lightning.

The invention discloses a manual board discharging device for reflow soldering furnaces, which comprises a conveying chain (1) for conveying printed circuit boards, wherein the conveying chain meshes with a sprocket (3) transmitted by a transmission shaft (2). The device is characterized in that a one-way bearing (4) is sheathed outside the transmission shaft (2), a reflow soldering power unit (5) is arranged on one side of the one-way bearing, and the reflow soldering power unit transmits the one-way bearing by the chain to drive the transmission shaft. The device can discharge boards by manual operation during power failure without being affected by the force of the retarder of the power unit.

The invention belongs to the technical field of cables and relates to a lightning protected cable for a communication base station. The lightning protected cable for the communication base station comprises a cable core, an inner protecting sleeve, an armor layer, an outer protecting sleeve and a ground layer. The lightning protected cable for the communication base station is characterized in that a first protecting layer is arranged outside the cable core, the inner protecting sleeve is arranged outside the first protecting layer, a second protecting layer is arranged outside the inner protecting sleeve, the ground layer is arranged outside the second protecting layer, the armor layer is arranged outside the ground layer, and the armor layer is coated with the outer protecting sleeve; the armor layer is a single-face film covering steel belt and the face, in contact with the ground layer, of the armor layer is a non-film-covering face; the first protecting layer and the second protecting layer are both mica tapes; the outer protecting sleeve comprises, by weight, the following raw materials of 71 parts of polyethylene, one part of anti-oxygen 1010, 12 parts of aluminum hydroxides, 0.5 part of HK-type antistatic agent, 3 parts of ethyl acetate, 1 part of carbon black, 10 parts of zirconium oxide and 1.5 parts of polyethylene wax. The lightning protected cable for the communication base station has the advantages of being simple in manufacturing, high in production speed, capable of enabling the electrical resisting rate of the ground layer to be low, low in maintaining cost, small in dust adsorption, pressure resistant, and good in flame resistance.