43results about How to "Limit up and down movement" patented technology

The invention discloses a fixing device for a special-shaped PCB. The fixing device comprises a frame which is mainly encircled by a first cross board, a second cross board, a first longitudinal board and a second longitudinal board; sliding grooves are formed in the inner side surfaces of the first cross board, the second cross board, the first longitudinal board and the second longitudinal board respectively; two parallel cross sliding strips and two parallel longitudinal sliding strips are arranged in the frame; one end of each cross sliding strip is embedded in the sliding groove of the first longitudinal board; the other end of the cross sliding strip is embedded in the sliding groove of the second longitudinal board; through grooves are formed in the cross sliding strips; one end of each longitudinal sliding strip is embedded in the sliding groove of the first cross board; the other end of the longitudinal sliding strip penetrates through the through grooves of the two cross sliding strips, and is embedded in the sliding groove of the second cross board; opposite grooves are formed in the opposite side surfaces of the two longitudinal sliding strips. According to the invention, the special-shaped PCB is restricted to move up and down through the grooves of the two longitudinal sliding strips, is restricted to move horizontally through the two cross sliding strips, and is fixed effectively.

The invention relates to the technical field of transportation, in particular to a lateral shoring device for goods in a container and a method for reinforcing the goods in the container. The method for reinforcing the goods in the container utilizes the lateral shoring device. The lateral shoring device comprises vertical supporting beams arranged on the inner sides of the goods and telescopic shoring pieces for shoring the vertical supporting beams. The telescopic shoring pieces press the vertical supporting surfaces of the vertical supporting beams against the goods in the shoring state, and the telescopic shoring pieces can release pressing of the vertical supporting beams against the goods in the released state. The lateral shoring device focuses on force application in a wide range in the height direction of the goods, the vertical supporting beams in the lateral shoring device are supported by a container floor, so that the goods in the container can be stably fixed to be prevented from toppling; and due to the fact that the vertical supporting beams are components used for applying force on the goods and the telescopic shoring pieces are telescopic, the lateral shoring device is suitable for goods with various heights and thicknesses and can be repeatedly used.

The invention relates to a pretension and lay-off method of a crane jib for a ship, belonging to the technical field of a crane. The crane comprises a luffing mechanism composed of a top pulley block, a jib, a winch, a luffing wire rope and a jib head pulley block and a bracket. The method comprises the following steps: A. operating the winch in the forward direction, loosening the jib and layingoff the jib onto the bracket; and B, operating the winch in the reverse direction, pulling the jib upwards to enable the pressure of the jib on the bracket to be less than the pressure on the bracketbefore being subjected to the upward pull, and stopping and shutting off the winch. The invention also relates to a pretension and lay-off device of a crane jib for a ship. The luffing mechanism alsocomprises a middle pulley arranged at the middle of the jib, and the luffing wire rope is connected with the jib head pulley block and the middle pulley through the top pulley block. The pretension and lay-off method and device of a crane jib for a ship can produce a pretension force on the jib by means of the luffing wire rope, thereby reducing the self-weight load of the jib as well as the influence and the destruction on the jib structure as a result of the shock load and the changing load of the bracket on the jib. Besides, the invention has the advantages of simple method and structure, convenient operation and low cost.

A disc type movable polishing grinding tool relates to a polishing grinding tool for a stone machine tool, which aims at carrying out polishing treatment on planes of irregular stones. The disc type movable polishing grinding tool is structurally characterized in that a plurality of grooves are arranged on a grinding disc pedestal and are internally provided with a grinding unit body respectively; each grinding unit body is structurally characterized in that a sheath is connected with a base, a spring is sheathed outside a single grinding head which is fixed in the sheath through a limiting pin, and a limit gasket is arranged between the sheath and the base; and through holes of which the number and positions correspond to those of the grooves are arranged on a grinding disc cover plate, and the single grinding head of each grinding unit body penetrates through the through holes of the grinding disc cover plate after the grinding disc cover plate is connected with the grinding disc pedestal. The disc type movable polishing grinding tool is applicable to the stone machine tool for carrying out polishing treatment on planes of irregular stones, can also carry out polishing treatmenton the surfaces of non-planar stones while realizing the polishing treatment on the planes, thus being capable of greatly improving the current polishing treatment efficiency on the surfaces of non-planar stones.

A cable protection and guide device in which wear damage in mounting portions of a mounting bracket is avoided and the mounting bracket is reliably and strongly mounted so that the cable is smoothly protected and guided. The mounting operation of the bracket is easy. A cable protection and guide device includes a mounting bracket having a mounting hole which surrounds and accommodates a tap bolt. A threaded portion 162 of the tap bolt includes a metallic bush 170 and the length H 1 of the metallic bush 170 in a bolt inserting direction is shorter than the length H 2 of the mounting hole 143 in a bolt inserting direction.

Disclosed is an inner sliding block contraction mould. The inner sliding block contraction mould comprises a bottom plate, a plurality of guiding blocks evenly distributed on the bottom plate in the circumferential direction of the center of the bottom plate and an upper cover plate fixed to the guiding blocks. A plurality of first sliding blocks, second sliding blocks used for driving the first sliding blocks to slide towards the outer side and tapered wedges used for driving the second sliding blocks to slide towards the outer side are arranged between the bottom plate and the upper cover plate. The first sliding blocks and the second sliding blocks are located at the peripheries of the tapered wedges. Each first sliding block is mounted on the corresponding guiding block in a sleeving mode. Each second sliding block is located between the two adjacent first sliding blocks. The inner side faces of the first sliding blocks and the second sliding blocks are connected with reset mechanisms used for driving the first sliding blocks and the second sliding blocks to slide towards the center. The inner sliding block contraction mould has the distraction and contraction functions, in theworkpiece forming process, a workpiece is supported and abutted against through the distracted first sliding blocks and the distracted second sliding blocks; and after workpiece forming, the first sliding blocks and the second sliding blocks are contracted, the workpiece is taken out, and machining of inward folding or the pressure level of a round barrel body part is facilitated.

The invention discloses a flexible device for a balanced movable smoke cover, which comprises an S-shaped rotary loop mechanism, wherein one end of the S-shaped rotary loop mechanism is provided with a fixed part and the other end of the S-shaped rotary loop mechanism is provided with a movable part. The flexible device for the balanced movable smoke cover is characterized in that the device alsocomprises a balance mechanism which can make the front end and the rear end of the movable part maintained on the horizontal position, wherein one end of the balance mechanism is connected with the front end of the movable part and the other end of the balance mechanism is connected with the rear end of the movable part. Moreover, balanced chainwheel and chain structures are arranged on front pipeline sections and rear pipeline sections of spherical joints of the movable end, so that front pipeline sections and rear pipeline sections of a first group of spherical joints of the movable part are guaranteed to maintain on the horizontal position during the process of vertical motion, thereby the flexible device is flexible to move and has the smallest resistance.