119 results about "Lifting weight" patented technology

An exercise machine, having: (a) a frame; (b) a pair of weight stacks connected to opposite sides of the frame; (c) a pair of vertically moveable pulley carriages connected to front portions of the frame; (d) a lifting bar assembly connected to a rear portion of the frame; (e) a pair of arm cables, wherein each of the arm cables are connected to one of the pulley carriages and pass around a first series of pulleys such that the weight stacks are lifted when the arm cables are pulled by a user through the pulley carriages; and (f) a pair of lifting bar cables respectively connected to a pair of vertically moveable bar mounts of the lifting bar assembly that pass around a second series of pulleys such that the weight stacks are lifted when a lifting bar of the lifting bar assembly is raised by the user.

The utility model discloses a novel bridge crane and relates to the technical field of cranes. The novel bridge crane comprises a first bridge side frame, a second bridge side frame and a hoisting assembly, the hoisting assembly comprises a base, hoisting moving wheels, a moving servo motor, two lifting rope winding drums, a transmission box, a hoisting motor, a hoisting frame, a rope winding drum and a hook, the two lifting rope winding drums are arranged side by side, and the hoisting motor is in transmission connection with the side ends of the lifting rope winding drums through the transmission box. The base moves along the guide rail through the lifting moving wheel, the moving servo motor is in transmission connection with the lifting moving wheel, the bottom end of the base is provided with the lifting frame, and the lifting frame adjusts and lifts the rope winding drum through a steel rope. The bridge crane disclosed by the utility model is large in lifting weight and simpler in structure; the lifting rope winding drums are independently controlled through the double lifting motors, so that lifting is effectively guaranteed; the relative position of the hoisting assembly is flexibly and finely adjusted by moving the servo motor, and the structure matching application effect is good.

The invention discloses a large-lifting-capacity multi-claw lifting hook and an assembling method and a detecting method thereof, and belongs to the technical field of lifting hooks. The large-lifting-capacity multi-claw lifting hook comprises a lifting rod, and a thrust self-aligning roller bearing is installed on the lifting rod; the hook body comprises a hook body and a hook tip, and the hook body and the hook tip are welded; the thrust self-aligning roller bearing supports the hook body, the self-aligning roller bearing is installed on the hook body, the suspender penetrates through the self-aligning roller bearing and the center of the hook body, and the hook body rotates relative to the suspender. And the large lifting capacity is more than 3500t. According to the invention, the large-lifting-capacity multi-claw lifting hook can be assembled and detected.

This invention discloses a winch ratio identification device, method, and crane. The winch ratio identification device includes: a rope end detection module for detecting the fixed position of the rope loop; a motor pressure detection module for detecting the motor pressure value; a lifting weight detection module for detecting the lifting weight value; and a ratio calculation module for identifying the winch ratio using a preset algorithm based on the position detected by the rope end detection module, the motor pressure value detected by the motor pressure detection module, and the lifting weight value detected by the lifting weight detection module. This invention offers higher reliability.

The utility model provides a liquid tank transfer mechanism of a small-hoisting-weight gantry crane, which relates to the field of liquid tank transfer and comprises a transfer assembly, the transfer assembly comprises a hoisting trolley, a first connecting steel rope, a lifting lug, a lifting bar, a second connecting steel rope and a connecting lifting hook, and a hoisting row mechanism is arranged at the bottom of the transfer assembly. The hanging row mechanism comprises a connecting frame, an adjusting frame, a threaded groove, a fastening threaded rod, a stabilizing block, a hanging row frame, an adjusting groove, a sliding groove and a clamping groove, a stabilizing assembly is arranged at the bottom of the hanging row mechanism, the stabilizing assembly comprises a connecting belt, a main lifter and a supporting belt, and a liquid tank segment body is arranged at the top of the stabilizing assembly. When the liquid tank segment body is hoisted, the gravity center of the liquid tank segment body is ensured to be stable, and the transfer of the liquid tank segment body is not limited by the hoisting weight of a crane and the gravity center position of the liquid tank segment body through the connection of the connecting frame and the hoisting bent frame, so that the transfer safety of the liquid tank segment body is ensured.

The present invention discloses a grab bucket lifting system and lifting machinery, the grab bucket lifting system includes a grab bucket device, a main lifting device and an auxiliary lifting device, the lifting connecting piece of the grab bucket device is fixedly arranged at the upper end of the grab bucket body, the opening and closing rope can drive the grab bucket body to switch between an unloading open state and a grabbing closed state, the main lifting rope of the main lifting device is connected to the lifting connecting piece through a main lifting pulley group, and the auxiliary lifting rope of the auxiliary lifting device is connected to the opening and closing rope through the auxiliary lifting pulley group. When the grab bucket body is in the unloading open state, the auxiliary lifting pulley group is located above the main lifting pulley group, and the first releasing length of the opening and closing rope is set to make the lateral spacing between the auxiliary lifting pulley group and the main lifting rope greater than or equal to the maximum offset distance of the main lifting rope under the action of the lateral deflection force, thereby making it possible to avoid the phenomenon of the pulley hook wearing the lifting rope while lifting the lifting weight of the grab bucket body.

This invention relates to the field of mechanical engineering, specifically to a method and device for calibrating the anti-tilting entry angle of the main boom in lifting equipment. This application employs an automatic calibration process under no-load conditions. First, it collects the main boom's self-weight torque and force-related parameters based on the initial low-position angle. Then, it identifies the actual entry angle by utilizing the abrupt change in torque difference during uniform boom lifting. Finally, it calibrates the torque of auxiliary components based on this angle. Its beneficial effects are derived as follows: Manual calibration is prone to errors in the perceived entry angle and the actual force applied. This application eliminates the subjective errors of manual calibration by determining the entry angle through the abrupt change in torque difference. With accurate actual entry angle, the torque limiter can match the actual force state of the hydraulic cylinder during calculation, avoiding the error of "prematurely calculating / omitting the anti-tilting torque," thus significantly reducing the deviation between the theoretical and actual lifting weight. This solves the problem of false overload alarms affecting operational efficiency and avoids safety hazards caused by deviations in lifting weight calculation.

The utility model relates to a heavy load transfer table with a zero-gravity lifting guardrail. The heavy load transfer table comprises a platform body, the guardrail and a lifting weight reduction module. A bearing surface is arranged on the upper surface of the platform body; at least one lifting weight reduction module is arranged on at least one side face of the platform body. The guardrail is connected with the lifting weight reduction module arranged on at least one side face of the platform body and surrounds at least one side of the platform body. The guardrail is in sliding fit with the lifting weight reduction module and ascends and descends in the direction perpendicular to the bearing face. And the weight of the guardrail is equal to the sum of the weights of the counter weights of all the lifting weight reduction modules connected with the guardrail. According to the lifting guardrail, the applicability to protection of objects with different heights is improved, and the convenience of lifting operation of the guardrail is improved.

The invention discloses an ultra-deep large-diameter tubular pile hoisting process which comprises the following process steps: 1) determining an estimated pile length and a maximum hoisting capacity according to a tubular pile material and geological conditions, and selecting a 150t crawler crane; (2) butt joint with a tubular pile manufacturer is conducted, a reserved sleeve with the diameter being 60 mm and two rows of hoisting holes with the interval being 50 mm are formed in the hoisting side of the tubular pile, and the design of reinforcing ribs is deepened; (3) a steel bar with the diameter being phi 55 mm is inserted into a hoisting hole in the upper portion of the pile end, a common steel wire safety pin with the diameter being 3 mm is arranged, two steel wire ropes with the diameter being 39 mm are used for surrounding the outer wall of the pipe pile for hoisting, and the safety coefficient of the steel wire ropes is 6; (4) clamping the pipe pile by a special clamp after the pile hole is in place, inserting a steel bar into a hoisting hole in the lower part of the pile end, and loosening the steel wire rope after confirming the fixation, and (5) lowering the pile at the speed of 1m / min after the end plate is welded and cooled for 8min, and repeating the operation until the whole pile is completed through multiple anti-slip designs, so that the hoisting safety and quality of the ultra-deep large-diameter pipe pile are guaranteed.

A hip thrust attachment exercise system includes a bench, a support system coupled to the bench and having a support bar underneath the bench; and a bench support brace extending from the bench and coupled to the support bar; a first leg and a second leg each extending from the support bar; a weight stand having a first stand leg with a first handle; a second stand leg with a second handle; and a bar extending between the first stand leg and the second stand leg; and a rotational support bracket extending from the bench and coupled to the bar such that the bar can rotate within the rotational support bracket; the weight stand is to be lifted via the first and second handles such that the bar rotates within the rotational support bracket; and once the weight stand is lifted, the user can perform a hip thrust exercise.

An interchangeable weight bar device for attaching numerous weightlifting bars to a Smith machine includes a frame that has a base, a top, and a pair of columns that are coupled to and extend between the base and the top. A pair of sleeves are movably coupled to the pair of columns. A pair of tubes is coupled to the pair of sleeves. A barbell is movably coupled to the frame wherein the barbell is slidable along the pair of columns between the base and the top of the frame to facilitate a user in lifting weights. The barbell includes a pair of outer sections that are positioned to extend through the pair of tubes wherein each outer section of the pair of outer sections is positioned within a respective tube of the pair of tubes. A central section is removably couplable to the pair of outer sections.

The utility model discloses a lifting limiting device of a tower crane, which relates to the technical field of tower cranes and comprises a frame component and a lifting limiting component, and the lifting limiting component comprises a pulley, a pulley yoke, a weight limiter and an outer support wheel. An auxiliary supporting assembly is arranged in the area below the outer supporting wheel and the weight limiter. By arranging the auxiliary supporting assembly, when the hoisting capacity limiter breaks and loses efficacy, the concave supporting frame limits and supports the downward movement of the outer supporting wheel, so that the pulley yoke can be prevented from continuing to rotate downwards, the effect of temporarily supporting the pulley yoke is achieved, sudden falling of the pulley yoke is avoided, and meanwhile the hoisting capacity limiter is prevented from being damaged. When the tower crane is used, broken and invalid lifting limiters and fragments generated by breakage can be borne by the bearing net frame, potential safety hazards caused by high-altitude falling objects are avoided, in addition, the steel wire rope can be prevented from falling off from the groove of the pulley through the middle limiting wheel, and the use safety of the tower crane is effectively improved.

1. The name of the design product: weight limiter. 2. The use of the design product: the product is mainly used to limit the overload of crane machinery. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: perspective drawing.

The application discloses a kind of hoisting and turning over method of warship aluminum ship body, belong to ship body hoisting and turning over technical field, solve the technical problem that existing hoisting and turning over scheme construction cycle is long, labor cost is high.Method is: using aluminum alloy lifting weight is welded to ship body and hoisted and turned over, specifically: the segmented ship body of warship aluminum is carried out;Determine hoisting and turning over mode, the arrangement of aluminum alloy lifting weight, the selection of aluminum alloy lifting weight form, the analysis of lifting point position strength and the determination of hoisting strengthening form;Before hoisting and turning over, the lifting point area is strengthened;Weld aluminum alloy lifting weight, check weld internal quality, mark point is made around aluminum alloy lifting weight;The segmented ship body is hoisted and turned over;After hoisting and turning over, check weld internal quality, surrounding plate deformation condition;The form of aluminum alloy lifting weight or lifting point position or strengthening form is improved.Using aluminum alloy lifting weight hoisting and turning over can greatly improve the efficiency of ship building, reduce manpower and material resources, and improve efficiency.

The invention relates to a modularized and universal power device hoisting device. The problem that an existing special hoisting device cannot support efficient research and development of multi-tonnage, serialized, universal and multi-form modularized power devices is solved. Comprising a main lifting chain assembly, a transmission unit lifting device, a power unit lifting device and a lifting weight measuring device, and the transmission unit lifting device and the power unit lifting device are detachably connected; a main lifting ring at one end of the main lifting chain component is connected with the lifting weight measuring device, a plurality of main lifting chains at the other end are respectively connected with top surface connecting lifting rings of the transmission unit lifting device and the power unit lifting device, and the connecting position can be adjusted according to the gravity center of the lifting device; the transmission unit hoisting device and the power unit hoisting device are provided with a plurality of sub-hoisting chains, the lower ends of the sub-hoisting chains are connected with hoisting points of the hoisting device, and the positions of the sub-hoisting chains can be adjusted according to the positions of the hoisting points of the hoisting device. The multi-scene and multi-process hoisting requirements can be met, and the multi-point hoisting rapid leveling and weight measuring functions are achieved.

Hub storage plant for storing and feeding back electrical energy and for network load adjustment in a power grid (9) of a power grid network or a self-sufficient power supply system connected to the hub storage plant, wherein the hub storage plant comprises a plurality of individually controllable hub modules (4) and a central control and regulation unit (5) connected to the power grid (9), wherein each of the hub modules (4) has: - a cable winch (4.1) with at least one winch cable (4.3) and with a winch motor designed as an electric motor, which can be operated in motor and generator mode, - a lifting weight (4.2) suspended from the winch cable (4.3) for storing energy in the form of potential energy of the lifting weight (4.2) by lifting the lifting weight (4.2) by means of the cable winch (4.1) and for using the stored potential energy by lowering the lifting weight (4.2) by means of the cable winch (4.1), - a guide system for guiding the lifting weight (4.2) when raising or lowering the lifting weight (4.2), and - an electronic unit for controlling the winch motor and for power conversion, wherein the electronics unit and the winch motor of the cable winch (4.1) of each of the lifting modules (4) are each connected to the central control and regulation unit (5) via power lines (11) and via data and control lines (12), and wherein the lifting storage unit is designed to convert electrical energy from the power grid (9) into potential energy of the lifting weights (4.2) by means of the central control and regulation unit (5) and to convert the stored potential energy of the lifting weights (4.2) back into electrical energy by means of individually controlled lowering of the lifting weights (4.2), characterized in that - the cable winch (4.1) of each of the lifting modules (4) is a double cable winch arranged on the floor of the respective lifting module (4) and having two of the winch cables (4.3), wherein the two winch cables (4.3) are wound in parallel single-layer windings on the double cable winch, - the lifting weight (4.2) of the respective lifting module (4) is suspended from the two winch cables (4.3) which are attached to two spaced-apart suspension points on the lifting weight (4.2), and - the guide system of each of the lifting modules (4) designed to guide the lifting weight (4.2) comprises the two winch cables (4.3) and, for each of the two winch cables (4.3), a cable guide which deflects the respective winch cable (4.3) on the ceiling side in the lifting module (4), wherein the respective cable guide for deflecting the respective winch cable (4.3) has a first deflection pulley (4.4) in the form of a fixed cable pulley arranged on the ceiling side in the respective lifting module (4), wherein the winch cable (4.3) forms a first cable section between the cable winch (4.1) and the first deflection pulley (4.4) and a counter-rotating second cable section between the first deflection pulley (4.4) and the suspension point on the lifting weight (4.2).

The utility model relates to a dumbbell capable of quickly adjusting weight, which comprises a dumbbell handle group and a dumbbell piece group, the dumbbell handle group comprises a rotating handle, an outer protecting cover and an inner protecting cover are arranged at the left end and the right end of the rotating handle, a protecting cover fixing frame is arranged between the inner protecting cover and the outer protecting cover, and a left cam group and a right cam group are fixedly arranged on the left side and the right side of the rotating handle respectively. The left cam group and the right cam group are arranged in the protecting cover fixing frame and are respectively composed of at least two groups of cams; the protective cover fixing frame is arranged in the dumbbell piece set, the dumbbell piece set is composed of at least two dumbbell pieces, the dumbbell pieces and the cams are arranged correspondingly, the cams are connected with cam swing arms in a matched mode, the cam swing arms are driven by the cams to swing outwards to enter steps of the dumbbell pieces, the cam swing arms are connected with reset springs, and the other ends of the reset springs are fixed in the protective cover fixing frame. The dumbbell does not need to be manually disassembled, increased or decreased, the lifting weight can be adjusted by rotating the handle, and the dumbbell is simple in structure, convenient to use, safe, reliable, multiple in adjusting gear, small in size and convenient to store and carry.

The invention provides a design method and application of a hydraulic mechanical arm hoisting load anti-swing self-adaptive fuzzy sliding mode controller, belongs to the technical field of engineering machinery, and aims at solving the problem that switching items of sliding mode control are discontinuous, fuzzy approximation is carried out on the switching items of the sliding mode control by combining a fuzzy control method and self-adaptive sliding mode control, and therefore the switching items of the sliding mode control are not continuous. And the problem of discontinuity is solved. The design method comprises the following steps that 1, a hydraulic mechanical arm hoisting system model is established, and a self-adaptive sliding mode anti-swing controller is designed on the basis of the hydraulic mechanical arm hoisting system model; and 2, introducing a fuzzy control method into the adaptive sliding mode anti-swing controller, and establishing an adaptive fuzzy sliding mode controller. The self-adaptive fuzzy sliding mode controller designed by the invention has an obvious swing control effect on the hoisting load in the movement process, the control speed is high, the hoisting load is stable and operates under the action of the controller, the swing amplitude of the hoisting load is kept in an acceptable range, the sudden change condition is avoided, and the control accuracy is high. And the requirements of rapid elimination of hoisting swinging and accurate operation are met.

The application discloses a prefabricated beam manufacturing process automatic identification method and system based on multi-source data, which comprises the following steps: acquiring the position of steel bars and the binding condition, the position change of a template, the temperature change in a steam curing kiln, the key parameters in the prefabricated beam production process, the gantry crane and the position of the lifting hooks of the gantry crane, and the lifting weight information of the lifting hooks of the gantry crane; the data storage and processing module automatically identifies each process in sequence through an AI algorithm; when the steel bar binding process starts, a process warning unit of a process warning and prefabricated beam process binding module automatically creates a virtual beam number associated with the process, the process warning unit automatically generates the content of a short message notification according to the current production line data and automatically sends the short message notification to the relevant person in charge; the person in charge accesses the virtual beam number list provided by the process warning unit, selects the corresponding virtual beam number to bind the process data, dynamically adjusts the virtual beam number to the real beam structure number, and realizes the automatic identification of the prefabricated beam manufacturing process.

The invention provides a gluing device and method for improving the surface energy of a balancing weight. The gluing device comprises a mounting table, a feeding mechanism, a conveying mechanism, a cleaning mechanism, a pushing mechanism and a gluing mechanism. The feeding mechanism is connected to the mounting table, the other mechanisms are arranged on the mounting table, an outlet of the feeding mechanism is connected to the conveying mechanism, and balancing weights are conveyed to the mechanisms; the cleaning mechanism is connected to the conveying mechanism and comprises a cleaning tool with the bottom provided with a hollowed-out part and plasma cleaning equipment, and the bottom of the balancing weight is cleaned through a plasma cleaning head below the hollowed-out part in the moving process of the balancing weight; and the cleaned balancing weight is conveyed to the rubberizing tool by the pushing mechanism, and an adhesive tape is pasted to the bottom of the balancing weight through the rubberizing mechanism. According to the gluing device, the surface of the balancing weight is cleaned through the plasma cleaning equipment, the surface energy of the balancing weight is effectively improved, the bonding strength is guaranteed, the purchasing and machining cost is effectively reduced, integrated machining is achieved, operation is convenient, and the working efficiency is high.

The invention discloses a rotary table lifting base device, which belongs to the technical field of lifting devices, is applied to lifting of a rotary table, and is characterized by comprising a bottom frame, a lifting frame, a transmission assembly, a power assembly and the like. The rotary table lifting base device adopts a lead screw transmission mechanism, and rapid and stable lifting of the rotary table is achieved. Due to the structural design of the base device, the practical requirements that the maximum lifting weight is 1700 Kg and the ascending or descending height is 710 mm can be met; when the rotary table rotates in an acceleration or deceleration mode, the maximum acceleration in the X direction, the Y direction and the Z direction can be ignored after the base device is subjected to an impact load for 2 seconds, no resonance mode exists within 0-25 Hz in modal analysis of the base device, resonance of the whole machine can be avoided, the stability of the whole device is improved, and the service life of the whole device is prolonged.

The utility model discloses a four point of prefabricated concrete block's even load hoisting structure, including a plurality of groups fixed setting on the hoisting ring of prefabricated concrete component, every group hoisting ring at least includes two, and the inside of every group hoisting ring is provided with a rigid link, and the rigid link passes through all hoisting rings of this group, and the middle part of rigid link is fixedly connected with one end of steel wire rope, and the other end of a plurality of steel wire ropes is concentrated in hoisting equipment lifting point. Both ends of rigid link are fixedly provided with end anti -slip device. Through the even load design of " multiple hoisting ring + rigid link", effectively disperses the concentrated load, and the safe lifting weight of single lifting point is doubled, and successfully breaks through the technical bottleneck of the hoisting of hundred tons class concrete component. The rigid link ensures that a plurality of hoisting rings are uniformly and synchronously stressed, and the end anti -slip device completely eliminates the risk of rod disengagement, and the structure is stressed explicitly, and the safety redundancy is high.

The utility model relates to a kind of display hanging assembly, including hanging seat, connecting seat and the horizontal shaft of both, and it is provided with damping structure between hanging seat and connecting seat;Wherein: a double lug is riveted rotatably in the rear part of hanging seat, double lug is clamped in the both sides of connecting seat, and be passed through by horizontal shaft, form rotatable positioning;The double lug is still provided with a traction shaft above the horizontal shaft passes through, spring is hung between the traction shaft and connecting seat, within the pitch travel of hanging seat, spring is always above horizontal shaft. The utility model has the characteristics of unique conception, reasonable space, large bearing capacity;The expansion and contraction of spring in structure adapt to the weight change caused by the pitch angle of hanging seat, the spring is elongated at large pitch angle, and the spring force is also increased, and both form dynamic balance, the external force required for adjustment is relatively constant, improve use experience.

The invention provides a crane sudden unloading operation warning method and system and a crane, and the crane sudden unloading operation warning method comprises the following steps: obtaining the hanging load weight of the crane, and judging whether the crane is subjected to sudden unloading operation according to the change speed of the hanging load weight when the crane unloads a heavy object; acquiring specific parameters related to swing of the boom, and judging whether the crane is subjected to illegal unloading operation or not according to whether the specific parameters exceed a preset range or not when the crane is subjected to sudden unloading operation or not; and when the illegal unloading operation of the crane is judged, the alarm unit is controlled to send out corresponding alarm information. According to the crane sudden unloading operation warning method, an operator can be warned when the crane carries out illegal unloading operation, the operator is reminded to avoid repeating the illegal operation, and therefore the service life of the crane is prolonged, and the use safety of the crane is improved.

The present invention discloses a multi-rate telescopic device, comprising a telescopic mechanism, a first boom rope, a second boom rope, a third boom rope, a basic boom, and a second boom, a third boom, a fourth boom, and a fifth boom sequentially embedded in the basic boom; the movable end of the telescopic mechanism is connected to the basic boom, the fixed end of the telescopic mechanism is connected to the second boom, the fixed front end of the telescopic mechanism is equipped with a first boom steering member, one end of the first boom rope is fixedly connected to the third boom, the other end of the first boom rope is wound around the first boom steering member and then fixedly connected to the basic boom, a first steering assembly is installed between the third boom and the fourth boom, the second boom rope is wound around the first steering assembly to drive the fourth boom to extend, a second steering assembly is installed between the fourth boom and the fifth boom, and the third boom rope is wound around the second steering assembly to drive the fifth boom to extend or the fourth boom to retract. The present invention solves the technical problems of the prior art five-section boom crane, such as high cost, low telescopic efficiency, and severe limitation on the lifting weight.

The invention relates to a modular large-tonnage rubber-tyred beam carrying machine self-adaptive to multiple working conditions, and relates to the field of bridge construction equipment. According to the technical scheme, various hoisting tasks with obvious span, hoisting height and hoisting capacity differences can be quickly adapted through structure adjustment. Specifically, firstly, one machine has multiple purposes, the working condition from double-machine combined hoisting super tonnage to single-machine medium tonnage is covered by means of modular design, the equipment purchase quantity and the management cost are greatly reduced, and the utilization rate is remarkably improved; working condition conversion is efficient, the length of a main beam and the height of a supporting leg are adjusted by increasing or decreasing standard sections, a lifting tool is replaced through a rapid connector, most modification can be completed in a beam field, consumed time is short, and the influence on the construction progress is small; the structure is safe and reliable, the structure is optimized according to different working conditions, and it is ensured that the structural strength, rigidity and whole machine stability under all configurations all meet safety specifications; and 4, the economic benefit is prominent, special equipment is prevented from being purchased for different working conditions, and the one-time investment and long-term maintenance cost are greatly reduced.

The invention discloses a counterweight structure of a mining machinery elevator, and relates to the technical field of mining machinery elevators. The well comprises a well body, a counterweight assembly is fixedly matched with the bottom in the well body and comprises a base fixedly installed at the bottom in the well body, two sets of guide rails are symmetrically and fixedly connected to the top of the base, a lift car is slidably matched between one guide rail and the other guide rail, and a weighing sensor is installed at the bottom in the lift car. By using the device, when an object to be lifted is within a set lifting weight range and objects to be lifted with different weights are lifted, the weight of one side of the lift car and the weight of the balancing weight are always kept consistent, so that the weights of the two sides reach a balanced state, and a rotating shaft and a hoisting roller only need to overcome friction force to a rope; in the rotating process of the rotating shaft, the torque requirement for the second motor is reduced, then the load on the second motor is reduced, and therefore the energy consumption of the second motor is reduced.

The present application relates to the technical field of rock drilling equipment installation, in particular to a kind of installation method for rock drilling ship, by the track, chassis, travelling mechanism, winch, receiving and releasing support and two-layer platform etc. Structure belonging to travelling trolley is lifted separately, so that lifting weight is small, small in size, lifting is easier and safer;And the installation foundation that first installation provides for later installation is stable and balanced, so that installation is more efficient and safe, can avoid overturning problem, and hydraulic percussion rock drill hammer is installed in guide rod frame in advance and hoisted integrally, avoid the problem that hydraulic percussion rock drill hammer is difficult to install after guide rod frame is installed. It makes the installation of heavy, complex structure rock drilling ship more simple, orderly, efficient and safe.

This invention provides a crane with a boom mounted on a chassis and capable of variable-amplitude rotation relative to the chassis in a vertical plane. A super-boom can rotate relative to the boom in both vertical and horizontal planes, driving the boom's variable-amplitude rotation. A lateral tension adjustment mechanism is connected between the two super-booms, capable of extending and retracting relative to the super-booms and adjusting the lateral tension length to laterally limit the super-booms in a horizontal plane. In a preparation and verification mode, the controller is configured to: acquire the operating condition command and the initial lateral tension length of the lateral tension adjustment mechanism; release the rated lifting capacity limit of the boom; and enter the lifting protection mode. This invention, by adding a lateral tension adjustment mechanism between the two super-booms, limits the outward bending tendency of the super-booms, reducing their deformation and stress. Furthermore, by matching the operating condition command with the initial lateral tension length and initial super-boom swing angle, it completes the preparation and verification of the boom before formal operation, eliminating operational safety risks and improving the crane's operational safety.

The invention belongs to the technical field of sports equipment, particularly relates to a weightlifting bed for physical training, and aims to solve the problems that a use mode and a safety protection device are single, a trainer may adopt a sitting posture mode for weightlifting due to unknowing during use, the safety protection device is difficult to play a protection role, the trainer is injured, and the training efficiency is high. According to the scheme, the bed comprises a bed body support, a bed body is arranged on the bed body support, and a plurality of rectangular openings are formed in the bed body; the two weight lifting arms are both arranged on the bed body support, and the two weight lifting arms are both provided with weight lifting handles. The weightlifting bed for physical training has the effects of increasing training postures and improving the safety protection effect, when a trainee carries out training in a sitting posture, the device can be stopped and locked in cooperation with the feet when the trainee is powerless, so that the weight carrying part is stopped, the trainee is prevented from being injured, and the using effect of the device is improved.