15results about How to "Small preload" patented technology

The invention relates to the technical field of energy-saving coal mills, in particular to an automatic control system of an energy-saving coal mill, which comprises a pulverized coal processing module used for processing raw coal into pulverized coal through the energy-saving coal mill; the detection module comprises a pressure sensor and a temperature sensor; the pressure sensor is arranged in the energy-saving coal mill and is used for detecting the working pressure in the energy-saving coal mill; the temperature sensor is arranged in the energy-saving coal mill and is used for detecting the temperature in the energy-saving coal mill; the communication module is used for transmitting the detected sensor data to the control module; and the control module is respectively connected with the pulverized coal processing module, the detection module and the communication module, and is used for determining the pre-tightening force of the electric valve according to the variance of the response duration of the electric valve or determining the working pressure in the energy-saving coal mill according to the average delay duration of the operation of the energy-saving coal mill. The control stability of the energy-saving coal mill is improved.

The invention discloses a chain tension dynamic adjusting method and system, and relates to the technical field of reversed loader control, and the method comprises the following steps: obtaining start-stop information of a reversed loader; when the start-stop information is in a shutdown state, a telescopic oil cylinder of the reversed loader is controlled to be in a complete contraction state; when the start-stop information is in a start-up state, calculation processing is carried out based on basic parameters and material parameters of the reversed loader, and real-time transportation volume parameters of the reversed loader are obtained; and performing automatic telescopic control on a telescopic oil cylinder of the reversed loader based on the real-time transportation volume parameter. According to the method, when the scraper reversed loader is started, the chain is automatically tensioned to be in a working state, when the scraper reversed loader is stopped for a long time, the pre-tightening force of the chain is automatically reduced to be in a loose protection state, the chain is prevented from being in a tensioned state for a long time, and the service life of equipment is prolonged.

The utility model relates to the technical field of bridge expansion devices, in particular to a bridge expansion device with an adjusting function, an external mounting rod is arranged between a first adjusting rod and a second adjusting rod, the first adjusting rod and the second adjusting rod are both movably inserted into the inner wall of the external mounting rod, and the outer wall of the first adjusting rod is in threaded connection with a first movable part; the outer wall of the second adjusting rod is in threaded connection with a second movable part, an elastic element is fixedly connected between the first movable part and the second movable part, the first movable part and the second movable part can be drawn close to each other by rotating the first adjusting rod and the second adjusting rod, and elastic potential energy of the elastic element can be enhanced along with drawing close of the first movable part and the second movable part. The problems that the rigidity and the bearing capacity of a bridge expansion device are limited, abrasion and fatigue damage are prone to occurring in long-term use, the pre-tightening force of the bridge expansion device is reduced, and therefore displacement changes of a bridge structure cannot be effectively coped with are solved.

This utility model relates to the field of building auxiliary materials, and in particular to an anchor bolt for fixing the thermal insulation layer of existing building exterior walls. It includes an anchor plate, an anchor bolt sleeve, a mixing body, an auxiliary nail core, and a sleeve head. The anchor bolt sleeve is provided with multiple barbs. The sleeve head includes a solvent chamber and a spraying part coaxially connected. The solvent chamber contains two cavities separated by multiple PVE elastic films, each containing an epoxy resin base and an epoxy resin curing agent. The auxiliary nail core drives the mixing body to rotate, ensuring thorough mixing of the epoxy resin base and curing agent. The mixed epoxy resin flows out through the spraying part, filling the gap between the anchor bolt and the wall. After the epoxy resin cures, the anchor bolt and the wall become integrated, achieving the effect of fixing the thermal insulation board.

The utility model relates to chain drive roller, and disclose a kind of chain drive roller barrel group axial locking device, including mounting bracket, the mounting bracket is fixedly connected with output mechanism, the mounting bracket is fixedly connected with second sprocket The second sprocket is provided with self-locking nut assembly, fixedly connected with axial locking mechanism, the axial locking mechanism is engaged with shaft sleeve, the axial locking mechanism includes second motor, first gear, sleeve rod, inner rod, mounting bracket, telescopic component, second gear, sliding slot, sliding rod, rack, wherein the second motor is fixed on one of bottom plate, the output end of the second motor is fixedly connected with first gear, the first gear penetrates bottom plate, and is rotatably connected with bottom plate, the first gear is fixedly connected with sleeve rod, the sleeve rod is connected with inner rod, the other end of the inner rod away from sleeve rod is fixedly connected with another first gear: make axial locking device flexibility better, can adapt to different diameter and different length shaft sleeve.

The invention provides a fixed clearance return stroke type high-speed axial plunger pump, and relates to the field of axial plunger pumps, the fixed clearance return stroke type high-speed axial plunger pump comprises a shell and a main shaft capable of rotating in the shell, the main shaft drives a cylinder body and an impeller to rotate, an axial channel is arranged in the cylinder body, a pre-tightening spring is arranged in the axial channel and provides pre-tightening force for a return stroke disc, and a plunger body can reciprocate in the axial direction. The end part of the plunger body is matched with the sliding shoe to slide on the swash plate, and a return stroke assembly is further arranged and comprises a return stroke plate, a fixed gap pressing plate and a fixing device; the return plate is limited between the fixed-gap pressing plate and the sliding shoe and arranged with the fixed-gap pressing plate in a spaced mode, and the fixing device is used for fixing the fixed-gap pressing plate to the swash plate. The return stroke assembly with the fixed gap is adopted, the problem that the sliding shoe excessively inclines and even disengages in the return stroke process is avoided, meanwhile, the return stroke disc utilizes the pre-tightening force of the center spring, and it is ensured that the sliding shoe is flexibly attached to and sealed with the swash plate under the low-speed working condition; the fixed gap pressing plate balances the centrifugal overturning moment of the sliding shoe through physical limiting under the high-speed working condition.

The invention relates to the technical field of optical devices, in particular to an optical adjusting frame, an optical testing device and an adjusting method of the optical adjusting frame. The optical adjusting frame comprises a fixed support, an adjusting support, a first elastic part and a second elastic part. The adjusting support is provided with a first driving part and a second driving part, one end of the first elastic part is connected to the fixing support, the other end of the first elastic part is connected to the adjusting support, the first elastic part is driven by the first driving part, and the first driving part is configured to adjust the compression or extension state of the first elastic part; one end of the second elastic part is connected to the fixing support, the other end of the second elastic part is connected to the adjusting support, the second elastic part is driven by the second driving piece, and the second driving piece is configured to adjust the compression or extension state of the second elastic part. The rigidity of the first elastic part is larger than that of the second elastic part. The optical testing device comprises the optical adjusting frame. The adjusting precision of the optical adjusting frame can be improved.

The utility model discloses a sundry fisher capable of filtering water, and relates to the technical field of fishers, the fisher comprises a fishing bucket, a telescopic rod and a fixed cylinder, the outer side wall of the fishing bucket is fixedly connected with the telescopic rod, the telescopic rod penetrates and extends into the fixed cylinder, the fisher further comprises an extension structure and a dumping structure, the stretching structure is arranged between the telescopic rod and the fixed cylinder and used for increasing the fishing length of the fisher, the dumping structure is arranged in the fishing bucket and used for conveniently dumping sundries out of the fishing bucket, the stretching structure comprises a threaded sleeve, the telescopic rod is in sliding connection with the inner side wall of the fixed cylinder, and threads are arranged on the circumferential side wall of the fixed cylinder. Pretightening force exists between the threaded part of the fixing cylinder and the telescopic rod, and the threaded part of the fixing cylinder is in threaded connection with a threaded sleeve. Through the arrangement of the dumping structure, a user does not need to turn over and dump the fisher in the sundry dumping process, time and labor are saved, and use is more convenient.

The utility model relates to a lock catch adjusting structure, a telescopic fixing rod and a desk lamp, which comprises a pipe sleeve detachably arranged at one end of a first rod piece, one end of the second rod piece can extend into the pipe sleeve, and the second rod piece, the first rod piece and the pipe sleeve are concentric and are in pluggable sliding fit; one end of the lock handle is hinged to the pipe sleeve; a containing cavity used for containing a second rod piece is formed between a first matching part formed in the pipe sleeve and a second matching part formed on the lock handle, the lock handle is pulled to the positions of different angles, and when the lock handle is pulled to the lowest position and the lock handle is attached to the outer portion of the pipe sleeve, the first matching part and the second matching part jointly extrude the outer wall of the second rod piece at the moment; the second rod piece is fixed; after the lock handle is pulled until the second matching part is separated from the second rod piece, the second rod piece can be subjected to telescopic adjustment, the lock handle is simple to adjust, and after the lock handle is in contact locking, the pre-tightening force of the pipe sleeve on the second rod piece is small, and telescopic adjustment is smooth.

The utility model discloses an ultrasonic tissue cutting knife, including blade holder, blade body and ultrasonic wave amplitude lever, ultrasonic wave amplitude lever sets up at ultrasonic tissue cutting knife one end and the end face is equipped with the round mounting hole of blade holder installation, the one end of blade holder is equipped with the square mounting hole of blade body installation, the surface symmetrical mounting of ultrasonic wave amplitude lever has fixed sleeve, the inside fixed sleeve installs locking screw, and one end of locking screw penetrates blade holder and extends to the inside of blade body and is inserted with it. The ultrasonic tissue cutting knife, the structure design is reasonable, convenient to use, through the mode of bolt screwing and fixing and cooperation shielding limit, can greatly guarantee the installation of blade holder and the installation firmness of blade itself, makes it have better use effect in the operation process, can effectively reduce the pretightening force of fastening bolt simultaneously, can improve the service life of threaded cooperation under the condition of often disassembling blade.

The utility model relates to a plunger cylinder technical field, especially a compact plunger cylinder of back and forth action, including cylinder body, plunger rod and guide sleeve, the head end of cylinder body is covered in guide sleeve, plunger rod is located in the cylinder body, and plunger rod stretches out from the guide hole of guide sleeve, its characterized by: still including piston rod, the tail end of plunger rod in cylinder body has piston hole, and the piston end of piston rod inserts piston hole, and the inner chamber of piston hole is divided into rod cavity and rodless cavity by the piston of piston end, and the opening of piston hole is covered with cylinder cover, and one piston oil cylinder is formed on plunger rod, and the rod end of piston rod is connected with the bottom end of cylinder body. The utility model has the beneficial effects that: through inlaying piston oil cylinder in plunger cylinder, the self-limiting and back and forth action of plunger cylinder are realized while not increasing the volume of plunger rod, and moreover, plunger cylinder and piston oil cylinder can work simultaneously, and plunger cylinder will not cause the decrease of thrust because of inner chamber piston oil cylinder.

The utility model relates to the technical field of rear steel plate spring, and disclose a kind of rear steel plate spring structure with adjustable pre-tightening force, adjusting mechanism is provided on U-shaped clamping plate, fixed mechanism is provided on adjusting mechanism, adjusting mechanism includes plug-in assembly and restriction component, plug-in assembly includes cylinder barrel and threaded rod, and the periphery of cylinder barrel top is respectively fixedly connected with telescopic plugboard, long rod top is fixedly connected with handle.The rear steel plate spring structure with adjustable pre-tightening force, threaded rod is inserted into steel plate spring, the stress state of steel plate spring can be changed, to realize the adjustment of pre-tightening force, by the rotating number of control screw rod, the purpose of controlling pre-tightening force size can be achieved, when telescopic plugboard is stretched and inserted in slot, square board is inserted in square slot, clamping block is clamped in clamping groove, the position of threaded rod can be fixed, avoid long-term to appear loose and fall off situation, guarantee that steel plate spring can exist buffering, shock absorption and support vehicle body's effect.

The present application belongs to the technical field of human body artificial limb, and particularly relates to a foot-ankle artificial limb with adaptive adjustment of buffer stiffness, which comprises a foot plate, an ankle joint connecting seat is fixedly arranged on the foot plate, a rotating shaft is fixedly arranged on the ankle joint connecting seat, a supporting seat is rotatably connected to the rotating shaft, a supporting cylinder is fixedly arranged on the supporting seat, and an ankle joint elastic reset unit and an ankle joint damping adjustment unit are arranged on the two sides of the supporting seat respectively. The gait sensing unit is used to detect the gait in real time, and the buffer stiffness adjustment, the ankle joint damping adjustment and the electromagnetic damping energy return unit are cooperatively controlled by the electric control unit, so that the synchronous adaptive adjustment of the equivalent buffer support stiffness and the ankle joint rotating damping of the foot-ankle artificial limb is realized. The foot-ankle artificial limb can not only ensure the soft foot feeling during walking and the stable support during running, but also can inhibit the rebound impact of the buffer spring and convert the rebound kinetic energy into electric energy for recovery, so that the walking comfort, the running support and the rebound damping performance are effectively improved.

The utility model relates to stress cable technology field, concretely is a kind of adjustable prestressed cable device, including mounting bracket, connecting frame, adjusting screw rod and anti-loosening mechanism;One end of mounting bracket is connected with connecting lug;Connecting frame is set in the end of mounting bracket and is used to fix the end of cable, and connecting frame penetrates mounting bracket and is slidably connected with mounting bracket;Adjusting screw rod is set in mounting bracket, and one end of adjusting screw rod is rotatably connected with mounting bracket, and the other end of adjusting screw rod is threadedly connected with threaded sleeve, and the end, away from adjusting screw rod, of threaded sleeve is fixedly connected with connecting frame;Anti-loosening mechanism is set on mounting bracket, and one end of anti-loosening mechanism is connected with mounting bracket.The utility model is provided with anti-loosening mechanism, check pawl is attached to spring elastic force under the action of check ratchet wheel and attaches to the check tooth of check ratchet wheel, and adjusting screw rod is positioned, to prevent loosening between adjusting screw rod and threaded sleeve, and then avoid the prestress of cable to be small.