497 results about "Lifting weight" patented technology

The invention discloses a safety protection system for a crane, comprising a plurality of sensors, a controller and a protection action actuating mechanism. The sensors detect and transmit the working state of the crane to the controller in real time; according to the detection data of the sensors, the controller calculates maximum allowable load determined by the characteristics of the crane under the current working state; the determined maximum allowable load is compared with the maximum allowable load related to the characteristics of the crane, then a minimum value therein is taken, and after predetermined design margin is taken, a rated working load G is obtained; according to the data of the sensors, current actual lifting weight is obtained through calculation; the actual lifting weight is compared with the rated working load, and if the actual lifting weight exceeds a preset safe range, the controller sends out a safety protection control signal limiting the crane to move toward the dangerous direction; and the protection action actuating mechanism limits the crane to move toward the dangerous direction according to the safety protection control signal. The invention provides a crane using simultaneously the safety protection system.

The present invention provides an incremental weight system for use with a weight stack of an exercise machines. As described herein, the incremental weight system enables users to incrementally increase the lifting weight, by adding weights that weigh less then the weight of a weight block. The incremental weight system is integrated onto the top of the weight stack, having a weight selector handle operable connected to a pair of engagement pins. The weight selector handle enables the engagement pins to be extended from and retracted into the assembly housing as the weight selector handle is rotated. Incremental weights are disposed at opposite ends of the weight stack. By rotating the weight selector handle, the engagement pins are extended from the assembly housing and engage the increment weights. The engagement pins engage the incremental weight by being inserted through the incremental weight receiving slots, such that, as the weight stack moves up and down, any selected incremental weights move in unison with the weight stack. If an incremental weight is not engaged by the engagement pin, the incremental weight will remain in position, while the rest of the selected incremental weights move unison with the weight stack.

A dynamically adjustable weight lifting aid that eliminates hand grip strength as the limiting factor in weight lifting, including a strap and a slidable sleeve encircling the strap. The strap has a wrist loop at one end and an attachment loop at the other end. The attachment loop is suitable for removably attaching the strap to a weight bar or other handle on a weight lifting system or machine. The wrist loop is suitable for receiving a person's wrist. Specifically, the person's hand is inserted through the wrist loop, and the person's palm contacts the slidable sleeve. The wrist loop cradles the person's wrist, and the effective diameter of the wrist loop is dynamically adjustable by the person's hand by sliding the slidable sleeve in either direction along the length of the strap. The person may then lift a weight of the weight lifting system by pulling on the strap.

The invention discloses a detection method and a detection device for the tipping state of a crane. The disclosed detection method includes the following steps: 11) selecting tipping parameters comprising a dip angle of a work plane opposite to the level surface, a rotation angle, a lifting angle of a jib, and the length of the jig; 12) obtaining tipping lifting weight by sampling in a space formed by the tipping parameters; and establishing the function relationship between the tipping parameters and the tipping lifting weight; 13) substituting the current tipping parameters into the function relationship so as to obtain the tipping lifting weight corresponding to the current tipping parameters; and 14) comparing the current actual lifting weight with the tipping lifting weight corresponding to the current tipping parameters, thus determining whether the crane is in the dangerous tipping state. With the detection method, operators can know whether the crane is in the dangerous tipping state and the safety property of the crane is improved; in addition, the dip angle of the work plane opposite to the level surface is introduced as one tipping parameter, so that the influence on the judgment on the tipping when the crane is in a non-horizontal state is avoided and the judgment on the tipping of the crane is more correct and reliable.

The present invention relates to a new handle for adapting kettlebell weights and for new modes of lifting weights.

A balancing valve for the engineering machine with 8-50 tons of lifting weight is composed of main valve and pilot valve. The said main valve consists of cylindrical valve body and main valve core. The said pilot valve is positioned in the main valve core. The core of pilot valve is linked to main valve core via springs. The main valve core is linked to valve body via more springs with different spriral directions and rigidities. Its advantages include correct, sensitive and reliable control, and preventing the burble dropping down of load.

The invention refers to an automatic leveling system of a multipoint electric support platform. The automatic leveling system of a multipoint electric support platform has advantages that the lifting weight is heavy; the stress distributes evenly and is controllable; the electric support performing mechanism touches the ground rapidly and reliably; the repetitiveness of the leveling precision is fine; the precision is high; the system is safe and convenient; the maintenance is convenient; the system information is visible; and the electric wiring is simple. In the system, a CAN bus network is arranged for controlling a leveling servo motor to move; a leveling display and control cabinet forms a control and display centre of the whole system working state, data and system fault codes via the control program software and hard ware drive program software arranged by a central digital controller; the central digital controller and the leveling display and control cabinet connected to the central digital controller together with an intelligent control box form closed loop control which performs mechanism grounding control, location control and gradient control to the support legs of the system leveling platform. The system has fine repetitiveness, stable working, high leveling precision, complete safety protection measures and convenient and reliable establishment and displacement.

The invention discloses a full-automatic vertical spiral feeding packing machine which comprises a bag supplying device 1, a bagging mechanism 2, a lifting weighting device 3, a feeder 4, a clamping opening shaping machine 5, a bag moving mechanism 6, a bag opening exhaust device 7 and a bag erecting and conveying machine 8. The feeder 4 is located in the center of the whole packing machine, the lifting weighing device 3 is arranged behind the feeder 4, the bagging mechanism 2 is arranged on the right of the feeder 4, the bag supplying device 1 is arranged on he lower right side of the bagging mechanism 2, the bag moving mechanism 6 which can move left and right is arranged below the feeder 4, the left and right opening type clamping opening shaping machine 5 is arranged on the upper left side of the bag moving mechanism 6, the liftable bag opening exhaust device 7 is arranged in front of the clamping opening shaping machine 5, and the bag erecting conveying machine 8 is arranged below the bag opening exhaust device 7. The full-automatic vertical spiral feeding packing machine has the advantages that the packing technological processes are complete, the automation degree is high, the weighing and measuring precision is high, dust is few in the packing process, and the equipment reliability is high.

The invention relates to a heavy load salvage wave compensation system of a super large floating crane, which comprises a mechanical system, a hydraulic system, a monitor system, control of a hydraulic oil cylinder, control of an accumulator and the like, wherein the mechanical system consists of a lifting drum, a plurality of sets of pulley, a steel wire rope and a large tonnage lifting hook, the hydraulic system consists of an oil cylinder, the accumulator, the hydraulic oil cylinder and a hydraulic valve, and the monitor system consists of a floating crane body displacement monitor, a floating crane ship body displacement monitor and a floating crane lifting heavy weight displacement monitor. The invention solves the problems that when the super large floating crane carries out heavy load salvage, and at the moment that a heavy weight is lifted out of water, because the heavy weight has large volume, seawater forms an eddy current to enable a floating crane ship body to be inclined and swing, and a lifting weight also swings along with the floating crane ship body and can not be controlled, solves the problems that when a large structure is lifted on the sea, waves influence the floating crane ship body to lead to difficult butting of marine platforms to ensure goods to be safely fall on a ship deck or safe offshore platform installation and allows that the ship has certain inclination to be suitable for tough working conditions of marine operation.

The invention provides a stability monitoring system of lifting equipment, comprising a first acquisition unit which is arranged at the position of a landing leg oil cylinder of the lifting equipment and acquires the force applied to each landing leg, a second acquisition unit which acquires the lifting weight of the lifting equipment, a judging unit which reads a working condition table which ispre-stored in a storage unit and a processing unit, wherein the working condition table contains working condition information, a lifting weight parameter and a rated landing leg counter-force, the working condition information corresponds to the lifting weight parameter and the rated landing leg counter-force one by one, the judging unit finds the rated landing leg counter-force which corresponds to the obtained lifting weight from the working condition table and compares the rated landing leg counter-force with the acquired force applied to each landing leg, and the processing unit limits the action of a corresponding executing mechanism according to the judging result. In the technical scheme of the invention, the stability monitoring system can detect the counter-force applied to eachlanding leg in real time and the rotating position of each landing leg, compares with the preset working condition table, controls the action of a crane and avoids the roll-over of the crane. The invention also provides a stability monitoring method of lifting equipment.

The invention relates to an electric spiral lifting rod, which is characterized in that a screw rod is driven by a motor to rotate and is sequentially and directly engaged with screw threads at the lower part of the inner side of each lifting section rod so that each lifting section rod can move up and down section by section. In the electric spiral lifting rod, n circular lifting section rods are arranged on a base of the electric spiral lifting rod and are sleeved together in sequence from the large diameter to the small diameter, wherein n=3-n, and n is greater than 3; and the upper parts and the lower parts of the inner sides of the n circular lifting section rods are respectively provided with a section of screw threads, the upper parts are provided with left-hand screw threads, the lower screw threads ordinarily lean against the threadless part of the screw rod, and the lower parts of the lower screw threads are respectively provided with a fastening screw cap which can move up and down along each lifting section rod and can rotate along the axes of the fastening screw cap. When all lifting section rods are sequentially lifted in places section by section, every adjacent lifting section rods are mutually engaged and connected through the left-hand screw threads at the outer side of the fastening screw cap of each lifting section rod and the left-hand screw threads at the upper parts of the inner side of the adjacent lifting section rods, the connection strength among the electric spiral lifting rods is high, and the reliability is good. The electric spiral lifting rod is used for producing superhigh erection type facilities and lifting weight products and can benefit the great reduction of the production cost because of the concise structure of the electric spiral lifting rod per se.

The invention discloses a superlift device, which is used for a telescopic crane, and comprises at least one rotary support, a derricking oil cylinder, a first tension device, and a second tension device, wherein a fixed end of the rotary support is pivoted with a basic boom of the telescopic crane; the derricking oil cylinder is arranged between the rotary support and the basic boom; the first tension device is arranged between a movable end of the rotary support and the outer end of any telescopic boom of the telescopic crane; and the second tension device is arranged between the movable end of the rotary support and the root of the basic boom. The first tension device applies a first tension force between the telescopic boom and the movable end of the rotary support, and the component force of the first tension force can balance the partial component force of a heavy object in a sheared direction of a main boom, so the stress state of the main boom is obviously improved, the deflection of the main boom is remarkably reduced under equal loading conditions, and performances of the telescopic crane such as total boom length, lifting height and lifting weight are remarkably promoted.

The invention relates to an electric automatic levelling brace for realizing multipoint electric automatic levelling, and aims to provide an electric automatic levelling brace with large lifting weight, rapid and reliable touchdown, good repeatability of levelling precision, high precision, safety, convenience, convenient maintenance and simple electric connection. The electric automatic levelling brace comprises a levelling bearing disc connected with a levelling brace cylinder body and a direct current servo motor with an electric control unit. The top of the levelling brace cylinder body is provided with a transmission chain which is connected with an output shaft of a speed reducer and a leading screw pair for rotary motion; the leading screw pair drives a levelling telescopic cylinder body manufactured with a screw and the levelling bearing disc fixedly connected with the leading screw pair together to do linear lifting motion; a microswitch for feeding back the lifting position to an external control system is arranged on the cylinder wall of the levelling brace cylinder body; a small displacement triggering shaft records the moving position, triggers the microswitch at a triggering point and transfers an electrical signal of the lifting position of the levelling brace to the outside; and the small displacement triggering shaft is connected external control equipment through the microswitch and forms a closed loop levelling system with the servo motor connected with the speed reducer .

The invention discloses a crane working condition inquiring system and a method. The system comprises a first input unit for obtaining a target weight, a second input unit for obtaining a target amplitude, and a comparison processing unit for comparing the target weight and the target amplitude with a lifting weight and a lifting amplitude in a crane performance table, and listing out working conditions that the lifting weight is greater than or equal to the target weight and the lifting amplitude is greater than or equal to the target amplitude. The crane working condition inquiring system and the method, provided by the invention, can compare the parameters, such as the target weight and the target amplitude of a lifting object input by a user with the crane performance table, and can list out the working conditions accordant with requirements for the user to estimate and choose; and compared with the prior art, the system and the method reduce the user manual participation time, and improve the working efficiency and the lifting safety.

A compact lifting device whose load arm is fixed to a cover of lid of a processing chamber provides, a tubular pan body with an externally easily adjustable spring counterweight type member passing through the tubular center of the pan body. The spring member is cleverly mounted between an upper and lower portion of the pan body and rotates with the pan body as the lift mechanism swings from side to side. An innovative center core mounting of the spring device allows loads from the lifted weight to be equally distributed on two side of the pan body. The rotation of the pan body is by the use of bearings which are constructed so that a flange of pan body is utilized as two races of a ball bearing further reducing the space need for mounting such a lifting device.

A weightlifting support apparatus comprises a frame assembly, a bench disposed thereon, a movable rack movably attached to said frame assembly, an actuation mechanism operatively coupled to said movable rack, and a control unit for selectively operating the actuation mechanism, The movable rack may support a barbell or heavy object thereon, and the actuation mechanism may impart a force on the movable rack to cause the rack to move in an upward or downward direction, thus assisting a user in lifting a barbell or heavy object when the user is incapable of lifting or moving the barbell or heavy object on his or her own. The apparatus reduces or eliminates the need for another person to standby while the user is lifting weights and improves the safety of the practice of lifting weights.

The invention discloses a crane safe operation electronic monitoring networking system which can immediately collect information such as the rotating angle, the width, the lift weight, the tower obliquity, and the like, when the crane works as jacking, unloading and lifting, to comprehensively analyze and judge, immediately control, alarm and lock the danger action which possibly cause the overturning, and can build a data channel to a customer supervision screen platform with a GPRS network. The crane is provided with a plurality of sensors which are connected with a programmable controller with an expansion module; the programmable controller is connected with a plurality of relays; the programmable controller is connected with contact circuits of the relays by a fault diagnosis circuit;the programmable controller is connected with a buzzer, a display screen, a memory equipment and a GPRS transmission terminal; and the GPRS transmission terminal is correspondingly provided with a database server and a customer terminal.

The present invention discloses an adjustable dumbbell, comprising a dumbbell bar, wherein the dumbbell bar comprises a rotatable handle having a support plate fixed at each end thereof, and the support plate is connected to a locating plate on which a plurality of sets of pin holes are formed; a weight plate holder, in which a pin cartridge is mounted, is arranged on an outside of the locating plate, heads of the locating pins are arranged correspondingly to the sets of pin holes on the locating plate, U-shaped separation ribs of the weight plate holder are plugged each to each between two adjacent weight plates of weight plate sets at both ends, and the weight plates of each weight plate set are arranged in a plurality of arc-shaped grooves of the base. According to the adjustable dumbbell, all the weight plates are placed on the base and may be attached or detached without manual removal, and the lifting weight can be adjusted only by rotating the handle.

The invention relates to a dynamic balance building tower crane which is a lifting appliance in the field of building machinery, and in particular to a dynamic balance building tower crane with a balance weight dynamically moving with lifting weight. The dynamic balance building tower crane comprises a weight, a tower frame, a balance weight, a pivot point, a lifting motor and a cable rope, wherein the electric movable balance weight comprises a controller, a balance weight motor, a movable rail, a weight pulley wheel and a pressure sensor; the pressure sensor is arranged on a lifting point of the weight, and connected with the controller; and the controller is connected with the balance weight motor, the balance weight motor drives the weight pulley wheel to move on the movable rail. The dynamic balance building tower crane solves the problem of lifting arm imbalance of the tower crane in China and abroad, realizes the relative balance of the lifting arm by the movement of the balance weight, automatically moves the balance weight back and forth, reduces the safe accidents of building crane inclination, and decreases the life damage on building workers by the crane. The weight of the lifting arm can be accurately calculated by using the controller of the balance weight.

A weight training bench apparatus for supporting the back of a user while the user lifts weights includes a support frame; an elongate bench platform mounted on the support frame at an angle to define a platform upper end and a platform lower end and having upper and lower platform segments extending between the platform upper end and the platform lower end, the upper platform segment being positioned at a first angle relative to horizontal, and the lower platform segment having an upper first portion extending at a second angle relative to horizontal which is smaller than the first angle to protrude forwardly from the upper platform segment, to follow the curvature of the user spine lumbar region, and has a lower second portion positioned at a third angle relative to horizontal which is larger than the second angle, to complete the 1% protrusion formed by the upper first portion and to further follow the spine lumbar region; and a seat mounted on a substantially V-shaped support frame to extend forwardly from the platform lower end.

Disclosed is a multi-rope friction lifter load identification method based on vibration analysis. According to the method, an acceleration sensor is arranged on a main shaft of a lifter to collect a vibration signal, and the signal is captured to serve as a time-domain signal to be processed; the signal to be analyzed is decomposed into a limited number of intrinsic mode functions by means of the empirical mode decomposing method, false and margin components are eliminated, and an effective IMF set is extracted; energy feature information of the signal is extracted by means of an effective IMF component, the energy, energy variance contribution rate and energy moment of the IMF component are selected to serve as feature values to construct a feature vector and a high-dimensional sample space thereof, the nonlinear mapping relation between a sample and a target is built by means of the vector regression algorithm with total lifting weight and load difference as the estimation target, and then the load value is calculated. The multi-rope friction lifter load identification method based on the vibration analysis is high in stability and estimation accuracy, used for obtaining the real-time lifting load of the lifter to further monitor the lifting load in real time, and capable of avoiding lifting failures caused by overloading, rope clamping, rope loosening and the like.

The invention relates to a large-load rope climbing mechanism, in particular to a large-load rope climbing mechanism based on special-shaped chain wheel transmission. Existing rope climbing mechanisms are small in lifting weight load weight and range and poor in safety and reliability during continuous lifting and falling work, additionally, contact between a rope and other components is point contact, and meanwhile, the rope is bent and prone to being damaged due to abrasion. The large-load rope climbing mechanism comprises a main supporting part, a rope and two transmission systems. The two transmission systems are arranged in the main supporting part. Each transmission system comprises a motor, a first gear adjustment assembly, a special-shaped chain and two chain wheel assemblies, wherein worm wheels are engaged with worms; every two second gear adjustment assemblies are coaxially connected with the corresponding work wheel; a special-shaped chain wheel is arranged between every two second gear adjustment assemblies; every two special-shaped chain wheels are connected through the special-shaped chain; every two worms are coaxially connected; and the motor is connected with any worm through the first gear adjustment assembly. A rope is clamped between the two special-shaped chains in the two transmission systems. The large-load rope climbing mechanism is used for lifting and releasing weights.