30results about How to "Controllable descent speed" patented technology

A magnetic-buffering speed bump comprises a bump panel. A first metal box is arranged on the lower surface of the bump panel. One end of the bump panel is connected with a rotating shaft and can rotate around the rotating shaft; the other end of the bump panel is connected with a hook fixed on the ground; a second metal box underground is arranged at the position relative to the first metal box; a magnet is arranged inside each of the first metal box and the second metal box; like poles of the magnets in the metal boxes face each other. The magnetic-buffering speed bump employs magnetic force as decelerating power; compression delay time of the magnets allow the bump to enable the vehicles, different in duty and running at low speed, to smoothly run; the bump, the same as common bumps, provides punitive vibration for high-speed passing vehicles; comfort level is increased for low-speed vehicles to pass the bump; corresponding safety is guaranteed.

A variable cross-section rope winding wheel comprises a wheel body (6.1) and an installation hole (6.2). The rope winding wheel is provided with a variable cross-section rope groove. When a rope is wound on different positions of the rope winding wheel groove, the friction force between the rope and the rope winding wheel groove is also different. A suspension device with the variable cross-section rope winding wheel is provided. A U-shaped rope penetrating part (2) is arranged on a suspension body (1) of the suspension device. A rope penetrating hole (1.1) is formed by a U-shaped opening of the U-shaped rope penetrating part (2) and the suspension body. The variable cross-section rope winding wheel is arranged on the suspension body. A suspension hole (1.2) bearing human body weight is arranged at a position deviating towards one side. A suspension body control handle (1.4) for controlling the deflection of the suspension device is arranged on the other side of the suspension hole. When the variable cross-section rope winding wheel is used, an operation rope passes through the rope penetrating hole and then is wound on the variable cross-section rope winding wheel. One end of the operation rope is fixed, and the other end of the operation rope hangs down to a lower position. A human body is fixedly connected with the suspension hole. When a human body is born and hung by the suspension hole alone, due to the fact that the fixed end of the operation rope and a free end thereof are mutually tightly compressed, the suspension device is in a self-locking state. When the human body applies pull to the suspension device through the control handle, the deflection of the suspension device happens, the rope begins to slide, the variable cross-section rope winding wheel is controlled to rotate by hand, and the friction between the rope winding wheel and the rope can be adjusted to control the descending speed. The devise solves the problem that an 8-shaped ring type suspension device in the prior art is difficult in self-locking.

The invention relates to a rope descending device, in particular to a rock climbing and high building escape descending device. It includes the main body, U-shaped lever adjustment mechanism, speed adjustment button, rope brake block and rope stop shaft. The main use of the physical lever principle is to provide double stopping force for the rope through a speed adjustment button. The user can effectively control the speed of the body's descent with the minimum force during the descent. The design is simple in structure and easy in operation, can control the descending speed, is safe and reliable, and is an essential tool for rock climbing and escape from high buildings.

The invention discloses a non-sedimentation sand box for civil engineering, which comprises a guide mechanism, an outer sleeve, a discharge mechanism and a reinforcement mechanism, the bottom of the outer sleeve is welded with a base, and the top inside the base is equipped with a reinforcement mechanism , the inside of the outer sleeve is fixed with an inner sleeve, and a reserved cavity is formed between the inner sleeve and the outer sleeve, and the inside of the reserved cavity is uniformly fixed with a spiral reinforcement column, and the inside of the inner sleeve An inner chamber is provided. In the present invention, an inner sleeve is provided inside the outer sleeve, a reserved cavity is formed between the inner sleeve and the outer sleeve, and at the same time, a spiral reinforcement column is uniformly fixed inside the reserved cavity, and the gap between the inner sleeve and the outer sleeve The spiral reinforcement columns are fixedly connected, and the spiral reinforcement columns are arranged in concentric circles inside the reserved cavity to strengthen the strength of the internal structure of the device.

A high altitude escape device comprises a mooring rope and a speed controller; wherein the speed controller is arranged on the surface of the mooring rope, the mooring rope is suspended in the sky by a pulley to form two up and down slip sections, one section is a no-load section is sheathed in the speed controller, and the other section is a load section and is fixedly connected with the speed controller; the speed controller comprises a shell and is internally provided with a plurality of pin shafts at intervals more than the diameter of the mooring rope; wherein a braking pin shaft is arranged above or below at least one pin shaft in a sliding way; one section of the mooring rope sheathed with the speed controller winds the baking pin shaft and the pin shafts below or above the brakingpin shaft at least in a dislocation way. In the invention, friction is produced between the mooring rope as well as the pin shaft and the braking pin shaft by dislocation winding of the pin shaft andthe braking pin shaft in the no-load section of the mooring rope and the speed controller, thus achieving the effect of reducing the descent speed of the speed controller. The no-load section of the mooring rope winds the pin shaft of the speed controller in the dislocation way, so that friction is produced between the mooring rope and the pin shaft, thus achieving the aim of reducing the descentspeed of personnel evacuation.

The invention discloses a control method, system and tractor in the technical field of tractors for controlling the descent and stability of implements. The outlet of the main pump is respectively connected with the inlet of the main relief valve, differential relief valve and implement control valve; the oil outlet of the implement control valve is connected with the spring chamber of the differential relief valve through the steady-state throttle The oil outlet of the control valve is connected with the inlet of the switch valve; the oil outlet of the switch valve is connected with the rodless chamber of the suspension cylinder in the suspension mechanism; the rodless chamber of the suspension cylinder is connected with the inlet of the down valve at the same time; The rod cavity is connected to the inlet of the secondary overflow valve; the position sensor, force sensor, lowering knob, target position setting knob and lowering speed setting knob are respectively electrically connected to the input end of the controller; the output end of the controller is respectively connected to the implement control valve The electromagnetic valve of the solenoid valve, the solenoid valve of the descending valve and the solenoid valve of the switching valve are electrically connected; it has the characteristics of good micro-movement, stable start, controllable descending speed, and stable descending process.

A nut cracker comprises a rocker handle, wherein a power connecting shaft is arranged on the lower part of the rocker handle; the power connecting shaft and a lower power gear are integrated; nut-shaped inner threads are arranged in the middle of the power connecting shaft and are connected with a lower fixing stud in a twisting manner; the power connecting shaft can move vertically; the lower part of the fixing stud and a fixing shaft A are fixed integrally; the fixing shaft A and a base are connected integrally; the base and the cover are combined or separated through a buckle; the upper part of the base is connected with a storage bin; the outer side of the power gear is connected with a driven gear; the lower part of the driven gear and a pressure stud are fixedly integrally; the upper part of the driven gear is connected with a horizontal fixing structure through an integrated fixing shaft B; the driven gear and the horizontal fixing structure move relatively in use; and by the horizontal fixing structure, the power gear and the driven gear can be located at the same horizontal position. The rocker handle sways to rotate the power gear on the left side, a gear on the right side is driven to move downwards, and therefore, a nut shell in the storage bin is extruded. The nut cracker has the characteristics of low cost, simple structure and easiness in operation.

The invention discloses a promotion hydraulic system, and belongs to the field of hydraulic systems. The promotion hydraulic system comprises a balance valve, a first shuttle valve, a first electromagnetic reverse valve, a second electromagnetic reverse valve and a first throttle valve; an oil inlet of the balance valve is communicated with a first oil inlet of the first shuttle valve; an oil outlet of the balance valve is communicated with a port A of a motor; a port B of the motor is respectively communicated with a control oil port of the balance valve and a port A of the first electromagnetic reverse valve; the control oil port of the balance valve is also communicated with a port B of the first electromagnetic reverse valve; an oil inlet of the first throttle valve is communicated with the control oil port of the balance valve; an oil outlet of the first throttle valve is communicated with a port B of the first electromagnetic reverse valve; and a port C of the first electromagnetic reverse valve is communicated with a second oil inlet of the first shuttle valve. The balance valve in the promotion hydraulic system is a one-way balance valve; and the cost of the one-way balance valve is lower than the cost of a two-way balance valve, so that the cost of the promotion hydraulic system is reduced.