153 results about "Traction Method" patented technology

The invention relates to a traction method and a system for rail transportation. A soft elastic composite material is used as an elastic vibration-damping structure; a center pivot block is connected with a traction pin by an elastic nylon center pin sleeve, and the nylon sleeve with certain elasticity avoids the rigid shock between the center pivot block and the traction pin and simultaneously realizes the unconstrained rotation between the traction pin and the center pivot block when a vehicle makes a turning; two traction pads are respectively arranged in the front and at the back between the center pivot block and a bogie frame in the traction direction, the traction pads are rubber-metal compound elastic elements, two end plates of the traction pads are respectively provided with a connecting pin, and the connecting pin on the traction pad is directly inserted into a connecting hole for the center pivot block and the bogie frame; and the two traction pads connect the center pivotblock and the bogie frame, transfer traction force and brake force and buffer the shock load in transverse direction, vertical direction and other directions, so that the vehicle has better dynamicalperformance in operation.

The invention relates to a welding strip dual traction mechanism and a welding strip traction method. The mechanism is characterized by comprising a first traction mechanism and a second traction mechanism which are arranged on the front side and the rear side of a conveying belt; the first traction mechanism comprises a first support, a first sliding block capable of moving back and forth along the conveying belt is arranged on the first support, a first clamping jaw arm capable of vertically moving is arranged on the first sliding block, and a first clamping jaw mechanism is arranged on the side, facing the welding strip feeding direction, of the first clamping jaw arm; the second traction mechanism comprises a second support, a second sliding block capable of moving back and forth along the conveying belt is arranged on the second support, a first clamping jaw arm capable of vertically moving is arranged on the second sliding block, and a second clamping jaw mechanism is arranged on the side, facing the welding strip feeding direction, of the first clamping jaw arm. The two traction mechanisms are arranged, the other traction mechanism avoids motion to the waiting position while one traction mechanism pulls the welding strip, the upper mechanism right moves to the waiting position when the lower mechanism finishes welding strip pulling, the welding strip can be circularly pulled, and the efficiency of a series welding machine is improved.

The invention discloses an emergency traction circuit based on hard wire control, which can determine the traveling direction of a train by identifying the hard wire in a first direction and identifying the hard wire in a second direction. Train occupancy grouping can be determined by the hard line of occupancy identification. The relationship between the traction motor steering of each power vehicle and the traction motor steering of the occupying power vehicle can be identified by the first steering identification hardwire and the second steering identification hardwire. Therefore, regardless of the marshalling form of the train, Whether marshalling is fixed, Applying this emergency traction circuit, It can synthesize the train direction, train occupancy grouping and the relationship between the traction motor steering of each power car and the traction motor steering of each power car to correspondingly control the traction motor of each power car to match the actual running direction, so as to effectively improve the applicability of the emergency traction circuit based on the hard wire control. In addition, the invention also discloses an emergency traction method based on hard wire control and a train, and the effect is as above.

The invention provides an underground space subsurface excavation construction method adopting a combined roof, which comprises steps: a proposed underground space is divided into a plurality of spaced channels, first metal plates which are higher than the top ends of the channels are arranged above space positions of the adjacent channels through a traction method, pipe joints which are provided with embedded grouting pipes are arranged in the channels through a pipe jacking method, metal frame units are arranged on top plates of the pipe joints, waterstop coating is injected between the top plates of the pipe joints and the first metal plates through the embedded grouting pipes, adjacent side plates of the pipe joints arranged on adjacent channels and soil bodies between adjacent side plates are removed, the top plates which are arranged on the pipe joints of the adjacent channels are connected through second metal plates, support units are arranged in the channels, concrete is casted in the top plates of the pipe joints, reinforced concrete is casted on bottom plates of the pipe joints, and reinforced concrete is casted on the side plates of the pipe joints which are arranged on the channels of the two sides of the underground space. The underground space subsurface excavation construction method adopting the combined roof reduces construction cost, guarantees construction quality, and is simple in construction method and rapid in construction efficiency.

The invention relates to a polypropylene composite for extrusion foaming. The composite comprises, by weight, 30-70 parts of polypropylene, 15-40 parts of a damping material, 10-30 parts of a reinforcing material, 1-10 parts of a compatibilizer and 0.05-0.5 part of an antioxidant. The polypropylene has the melting index of 0.5-10 g / 10 min (230 DEG C and 2.16 kg) and the melt strength larger than 30 cN (capillary traction method and 2-mm mouth model), and the damping material is a damping polymer or a damping polymer composite with the maximum damping coefficient tan delta large than 0.3 withinthe range of 0-50 DEG C. The foaming requirement can be met after the high-melt-strength polypropylene and the damping material are combined together in the polypropylene composite, the polypropylenecomposite has the synergistic effects of damping and shock absorbing and has the effect of enhancing the damping performance of the composite, and the damping performance of the composite is greatlyimproved.

A traction method for an operating line, in particular a mooring line, of a floating production unit includes the steps of: attaching an end chain portion of the operating line to a socket of a main cable running through a sheave at a work station; reeling in the main cable, using a winch, to bring the socket of the main cable up to the sheave; locking the operating line with a chain stopper; slackening the main cable and moving the sheave closer to the chain stopper to reduce pull on the main cable; reeling in the main cable to run the socket of the main cable through the sheave; once the socket of the main cable has run through the sheave, releasing the operating line from the chain stopper, and reeling in, by means of the winch, the main cable and the operating line connected to it, to set the operating line to a given tension.

The invention discloses a traction method for enabling parallel built ships of 300,000 dry docks to undock. The traction method comprises the following steps: 1. sealing two ship bodies built in parallel in the dry docks with mooring ropes and floating balls; opening a dock door, pressurizing water in the docks, and enabling the parallel ship bodies to float up; 3. tying tugs in the middles of the tail parts of the first-undocked ship bodies towards a dock door with a mooring rope so as to realize undocking; and finally realizing the undocking of the later-undocked ship bodies. According to practical conditions of parallel built ships of 300,000 dry docks, the selecting and sealing sequence of ship docking and undocking traction tools, traction process control, matching with the tugs and the like can be designed and determined; in the process, the sealing condition of dry docks in water pressurization, ship sealing condition in traction, and floating condition in ship undocking can be designed; and the condition that ships can safely and smoothly and fast undock can be ensured by utilizing modes of winch distribution and matching, towing vehicle control and the like.

A traction system for operating lines, in particular mooring lines and / or production lines, of a floating production unit has a number of work stations distributed along the unit, at least at two ends of the unit, and engaged by respective operating lines; a main winch; and a cable transmission device having a duty cable connected to the main winch, and guide means for selectively routing the duty cable to each work station for attachment to a respective operating line; at least one auxiliary winch, having an auxiliary cable connectable to the duty cable, is used to unwind the duty cable off the main winch and run the duty cable, along paths defined by the guide members, into a number of positions close to respective work stations.

The invention discloses a worm and gear traction system for a bridge rotating body, and a traction method. The traction system mainly comprises a control system, a power system, a speed reducing device, a worm gear, a worm, an upper swivel plate and a lower swivel plate. The traction method of the traction system comprises the steps of firstly, using the control system to start the power system so as to drive the worm to rotate, enabling the rotation of the worm to be linked with the rotation of the worm gear, driving the upper swivel plate to rotate by means of the rotation of the worm gear, and driving a bridge body to rotate until the rotating body takes place, wherein the rotating speeds of the worm gear and the worm are regulated and controlled by using the control system to adjust the rotating speed of a motor of the power system in a rotating process, so that the speed of the rotating body is regulated and controlled. The worm and gear traction system and the traction method have the advantages that the forward and backward direction traction for a rotating body structure can be realized, so that the demand of traction direction adjustment can be met when a rotation test is carried out and the rotating body is in place; worm drive is rigid drive, so that a traction hysteresis effect can be avoided, and continuous and uniform traction is realized; mechanical transmission traction is adopted, so that the traction system is good in stability.

The present invention belongs to the technical field of medical devices and particularly discloses a multifunctional traction frame for orthopedics department. The multifunctional traction frame for orthopedics department comprises a traction frame base seat, a supporting part is arranged at a lower part of the traction frame base seat, a lower limb fixing disk is horizontally and slidably connected to the traction frame base seat along a length direction, a limiting part for fixing a position of the lower limb fixing disk is arranged on the traction frame base seat, a driving part for drivingthe lower limb fixing disk to move is arranged on the traction frame base seat, a lower limb fixing part for binding lower limbs is arranged at a middle part of a left side of the lower limb fixing disk, a foot fixing part for fixing feet is arranged at the middle part of the left side of the lower limb fixing disk, a hook is connected to the foot fixing part, and a balancing weight is detachablyconnected to the hook. The multifunctional traction frame is mainly used for lower limb traction and solves a problem that a lower limb traction method in the prior art is liable to cause inconvenience in treatment for patients.