134results about How to "Adjust the preload" patented technology

The invention discloses a material self-unloading device. The material self-unloading device is characterized by comprising a fixing board, a rotary shaft, a material board, a first extension spring, a second extension spring and a spring connection board, wherein the material board is fixedly connected with the rotary shaft; the rotary shaft is connected with the fixing board through a rotary connection structure; the top ends of the first extension spring and the second extension spring are hinged to the fixing board; the bottom ends of the first extension spring and the second extension spring are hinged to the spring connection board; the spring connection board and the material board are fixedly connected through the rotary shaft. By arrangement of a mechanical device, materials are unloaded in a swinging mode through action of gravity and elasticity to solve the problem that an additional power source is needed in the material unloading process, unloading of the materials is accelerated and the recycling work of the material board is rapidly finished by utilization of the characteristic of the extension springs, and therefore a large number of energy sources and a large amount of time are saved, and the production efficiency is improved.

The invention provides a multi-layer protecting device for municipal heating pipeline construction. The multi-layer protecting device for the municipal heating pipeline construction comprises a heating pipeline, four corner frames and wedge blocks; four sets of locking blocks are tightly pressed at the four corners of the heating pipeline separately; the locking blocks are slidably connected to the inner sides of the corner frames; a set of adjusting threaded rods is connected to the central axis of each of the corner frames, a set of adjusting blocks is connected to the lower part of each sets of the adjusting threaded rods in a threaded mode; the adjusting blocks are slidably connected with the corner frames; the bottom of each set of the adjusting blocks is in elastic connection with each set of the locking blocks through a set of springs; a set of edge frames is fixedly connected between two adjacent sets of the corner frames through bolts; and two adjacent sets of protecting devices are connected in a inserting mode through the wedge blocks. The adjusting threaded rods are arranged to drive the adjusting blocks to slide in the corner frames, the pretightening force of the springs is adjusted, and then the pretightening force on the pipeline is adjusted, the pretightening force is adjusted according to actual requirements, and meanwhile micro adjustment of positions of thepipeline can be carried out through the pretightening force the four corner frames in the using process, and thus convenient installment is achieved.

The invention discloses a hinge lock. The hinge lock comprises a fixed piece and a moving piece which are hinged to each other, and further comprises a sliding plate, ejection rods, a spring and a guiding sliding block; one side of the sliding plate is provided with a rod sleeve; the rod sleeve is internally provided with a thread A; a thread B d is arranged on a pin shaft of the moving piece; therod sleeve is arranged on the pin shaft of the moving piece in a sleeving mode; the rod sleeve and the pin shaft are in threaded connection through cooperation of the thread A and the thread B; the sliding plate is further provided with at least one chute; the other side, opposite to an upper pin hole and / or a lower pin hole, of the fixed piece is provided with a plurality of horizontally formedcountersunk pre-tightening holes; the inner ends of the countersunk pre-tightening holes communicate with a limiting groove; the ejection rods are inserted and connected into the countersunk pre-tightening holes; and the front ends of the ejection rods can extend out of the bottoms of the countersunk pre-tightening holes and extend into the limiting groove. A door can be locked through a speciallydesigned hinge when being opened, a support rod does not need to be arranged on a wall additionally, the indoor space is tidier, and the safety of the indoor space is improved.