38 results about "Band brake" patented technology

The utility model provides a test bed for brake torque detection and material running-in, which relates to the technical field of brake detection and brake material test, and comprises a brake system, a detection system and a control system, the brake system comprises a brake wheel, two ends of the brake wheel are rotatably connected with a support shaft, and the brake wheel is rotatably connected with a bracket through two ends of the support shaft; a base is fixed to the bottom of the support, a driving hydraulic cylinder is fixed to the upper end of the base, a force sensor is fixed to the upper end of the driving hydraulic cylinder, a lever is rotationally connected to the upper end of the force sensor, an angle sensor is fixed to the surface of the lever, and the side end of the lever is rotationally connected with the upper end of the support. In combination with an existing advanced data processing algorithm, high-precision detection of the braking torque of the large belt brake can be realized, and the detection precision technology is improved.

This invention discloses a brake release device for an arc welding robot, relating to the field of robot technology. The brake release device includes: a collision sensor, which outputs a low level when the welding torch of the arc welding robot collides with another object, and outputs a high level when no collision occurs; and a main control chip, whose input is connected to initial, intermediate, and end manual switches, the output of the collision sensor, and a switching switch. The main control chip outputs a shaft brake release switch. When the welding torch of the arc welding robot collides with another object, the main control chip controls the relevant brake to release the brake through signal acquisition and calculation from the collision sensor. When a collision fault occurs during the automatic operation of the arc welding robot, the end brake is automatically released, allowing the robot to be removed from the interference zone for maintenance at any time, while ensuring that the servo origin is not lost during the rotation of each axis.

The application discloses a kind of brake band brake failure protection method and device, can when brake band brake is in failure state, start open loop zero servo control mode, in open loop zero servo control mode, determine the motor starting frequency matched with the current falling speed of lifting load, control motor starts at motor starting frequency, to control lifting load starts to descend from falling speed by motor to lifting load by applying upward direction tension, after motor starts, the operating frequency of motor is adjusted from motor starting frequency to preset frequency of lowering, to control lifting load to be lowered to ground at smaller speed corresponding to frequency of lowering.The application can start open loop zero servo control mode when brake band brake fails without action anti-falling device, safely lower lifting load to ground in the case where mechanical impact suffered by lifting mechanism is effectively reduced and braking comfort is improved, improve the work safety of lifting mechanism.

The utility model discloses a rotary table oil pressure band brake structure which comprises a table top, a rotary core shaft, a bearing, a base body, a bottom plate, a band brake cylinder body, a band brake piece and a spherical pin roller, the bottom plate is fixed at the bottom of the base body, and the band brake cylinder body is of a hollow cylindrical structure, fixed on the bottom plate and arranged on the lower portion of the rotary core shaft in a sleeved mode. A brake piece is installed on the inner side wall of the brake cylinder body, an oil pressure channel is arranged on the bottom plate and the brake cylinder body in a communicating mode and corresponds to one side of the brake piece, and a spherical pin roller is arranged on the lower portion of the rotating mandrel and corresponds to the other side of the brake piece. The brake pad is supported open through the rollers, it is guaranteed that the holding brake pad is completely separated from a rotating structure, original sliding friction is changed into rolling friction, abrasion resistance is improved, and the service life is prolonged; the requirement on the material performance is reduced, and the use cost is reduced; during later replacement and maintenance, only the roller part needs to be replaced, the whole oil cylinder is prevented from being replaced, and the maintenance cost and the maintenance difficulty are reduced.

The utility model provides a bicycle which can be safely used according to the original shape under the condition that a front wheel brake is not adjusted even if the bicycle is directly delivered to a user in a folded and shrunk packaging state, and can be easily and safely carried to a suburban park through the bicycle. And it is ensured that the bicycles in the indoor storage place can be better stored. The bicycle (1) is provided with left and right handlebar handles (2) which are provided with brake pull rods (3) and can be bent backwards. The side face of the front wheel 4 abuts against the frame lower tube 5 in the state that the handlebar is rotated by 180 degrees approximately. And a band brake assembly 8 disposed between the front fork 6 and the hub 7 of the front wheel 4. The front wheel brake is a belt brake, so that even if the bicycle is directly delivered to a user, the bicycle can be safely started and used according to the original shape without adjusting the left brake shoe and the right brake shoe like a caliper type brake.

The present application relates to a kind of spot defect marking fixed-length reel changing systems, belong to cable production equipment technical field, including cable extruder, defect calibration frame, meter mark spraying frame, outlet frame, reel changing frame base and cable reel, the top of defect calibration frame and meter mark spraying frame both sides are fixedly installed with cable conveying frame, the top of defect calibration frame and meter mark spraying frame are fixedly installed with cable bracket, the top of defect calibration frame is fixedly installed with cable defect detector and marking spraying machine, meter mark spraying frame is fixedly installed with meter mark printer and cutting hydraulic cylinder, cutting hydraulic cylinder is fixedly installed with cutting tool, the top of outlet frame is fixedly installed with adjusting frame, the inner wall of adjusting frame is fixedly installed with No.2 band brake stepping motor.In the present application, spot defect position can be accurately marked on non-stop reel changing production line and quickly changed reel, so as to facilitate secondary exclusion in subsequent process, reduce the workload of staff, increase production efficiency, and ensure cable quality.

The invention relates to the technical field of voltage regulation, in particular to a voltage regulation device of a band-type brake power panel, which comprises a base, the top of the base is provided with a regulation cabinet, the surface of the regulation cabinet is provided with a cabinet door, the inner side of the regulation cabinet is provided with a heat dissipation window, and the inner wall of the heat dissipation window is fixedly connected with a dustproof net; and a lifting mechanism is arranged at the bottom end of the adjusting cabinet. Through rotation of a positive and negative screw rod, a moving block can move and drive a movable rod to move, and then a connecting plate can drive a second supporting rod to vertically move, so that the height of the adjusting cabinet is conveniently adjusted; rainwater accumulation is not prone to causing invasion and soaking of the adjusting cabinet, the adjusting cabinet can be protected, short circuit, insulation failure or corrosion of metal parts can be prevented, and normal operation of the adjusting cabinet and stable adjustment of the voltage of the band-type brake power panel can be guaranteed.

The application relates to the field of electric machines, in particular to a high-load multi-degree-of-freedom gantry and brake clutch motor. The brake clutch motor comprises a rotor assembly, a stator assembly and a brake clutch assembly. The rotor assembly comprises a rotating shaft. The brake clutch assembly comprises an annular brake shoe connected to the rotating shaft, a brake block connected to the stator assembly and a driving mechanism. The driving mechanism drives the brake block to connect to or move away from the brake shoe. The driving mechanism comprises a first groove and a second groove. The bottom of the first groove is communicated with a gas generating device. After the gas is discharged, the driving mechanism drives the brake block to move away from the bottom of the first groove and further away from the brake shoe, thereby forming a non-braking state. The bottom of the second groove is provided with an elastic element. The elastic element drives the brake block to move away from the second groove and further close to the brake shoe, thereby forming a braking state. The brake clutch device can be integrated into the electric machine, and the brake clutch device is arranged around the rotating shaft, thereby greatly reducing the overall volume of the electric machine, and further reducing the overall volume in the application of the multi-degree-of-freedom joint, and being more suitable for limited space environment.

The invention relates to the technical field of converter oxygen lances, in particular to an accident lance lifting device for a converter oxygen lance, which comprises a bottom plate, the top of one end of the bottom plate is fixedly connected with a first mounting plate, the first mounting plate is fixedly connected with a main motor, and an output shaft of the main motor is fixedly connected with a first crowned tooth coupling with a brake wheel; a main reduction gearbox is fixedly connected to the middle of the bottom plate, and a high-speed shaft of the main reduction gearbox is connected with a second drum-shaped tooth coupling with a brake wheel. An elastic bearing is arranged through a pin, when a main motor is powered off or breaks down, a clutch is closed, meanwhile, an accident lifting driving device is connected, an accident lifting motor drives a second reduction gearbox to work, the second reduction gearbox drives the clutch to work, and the clutch drives an elastic coupler to rotate; the elastic coupler drives the main reduction gearbox to work, the main reduction gearbox drives the winding drum to rotate, the winding drum lifts and moves away the oxygen lance through the steel wire rope, and the safety of the oxygen lance is protected.

The present invention discloses a band brake control system, comprising: a flow amplification valve, a first control solenoid valve for controlling holding brakes, and a second control solenoid valve for controlling emergency and parking brakes, connected in series. The flow amplification valve is connected to the band brake via a switching valve and a function switching valve. When the first and / or second control solenoid valves lose power, the flow amplification valve is in the exhaust position, and gas within the band brake is discharged through the function switching valve and the switching valve to the flow amplification valve, thereby applying the brake. The band brake control system designed in the present invention not only applies band brakes in emergency, parking, and holding brake conditions, but also meets the control requirements of air-filling / air-exhausting brakes. It also comprehensively considers various operating conditions, including normal, fault, and rescue conditions, ensuring system safety guidance in the event of a system failure.

The present invention discloses a self-locking control device for a submarine photoelectric composite cable winch, comprising a main frame, a winch drum rotatably disposed within the main frame, one end of the winch drum being coaxially connected to a drive assembly via a main shaft, one side of the drive assembly being connected to an adjustment handwheel via a chain, one side of the adjustment handwheel being connected to a drive sprocket via a chain, and one side of the drive sprocket being engaged with a self-locking disc brake coaxially sleeved on the outside of the main shaft. The present invention arranges a self-locking disc brake circumferentially around the drive main shaft of the winch drum, wherein several wedge-shaped blocks on a movable locking block extending from the self-locking disc brake fit with the main shaft, thereby increasing the fitting area and friction, thereby increasing the braking torque, enabling fixed-point parking, and improving the reliability and safety of the brake. Simultaneously, the self-locking disc brake can be unlocked or parked with the aid of the drive assembly, thereby overcoming the problems of band brakes, the high labor intensity and physical exertion, and the need for a dedicated hydraulic station and dedicated hydraulic oil when using disc brakes.

The utility model discloses an electric synchronous band-type brake mechanism, which belongs to the technical field of injection molding machines and comprises a band-type brake template and two band-type brake components arranged on the band-type brake template, a synchronous wheel set connected with the band-type brake components is arranged on the band-type brake template, and a first transmission wheel and a second transmission wheel are arranged at one end of the synchronous wheel set. The first transmission wheel and the second transmission wheel are meshed, and the first synchronous wheel and the second synchronous wheel are connected with the band-type brake assembly through transmission belts respectively. According to the scheme, synchronous action of the band-type brake assemblies is achieved through the synchronous wheel assemblies, the first synchronous wheel and the second synchronous wheel can be driven to rotate through the first transmission wheel and the second transmission wheel, and then the four band-type brake assemblies on the band-type brake template are driven to act through the transmission belt. And the first transmission wheel and the second transmission wheel can be meshed together only by adopting a group of driving devices for driving, so that the structural arrangement on the band-type brake template is simplified, and the later maintenance treatment is facilitated.

This invention discloses a radial brake mechanism, comprising an annular cylinder, an annular piston, a radial contraction spring, and an elastic locking sleeve. An annular groove is formed on the upper surface of the annular cylinder, into which the annular piston is embedded. The radial contraction spring is disposed on the upper surface of the annular piston, and a pressure ring is provided on the upper surface of the annular piston. An injection hole communicating with the annular groove is formed on the side wall of the annular cylinder, and a component with the same structure as the upper side is provided on the lower side of the annular cylinder. A ball screw passes through the elastic locking sleeve via the lower annular end cover and exits through the upper annular end cover. This brake mechanism achieves rapid locking and releasing under pressure fluid control, and is particularly suitable for locking the feed axis screw of CNC machine tools. It can also be widely used in locking other rotating or axially moving components.

The present disclosure provides a robot control apparatus. The apparatus includes: a signal acquisition unit configured to obtain, in the case that a robot triggers emergency stop and if the body switch of the robot is turned on, a switch turn-on signal that the body switch of the robot is turned on; a control unit configured to output an enable release control signal; a logic processing unit configured to perform logic processing on the switch turn-on signal if the switch turn-on signal is received, then output a manual release signal, perform logic processing on the enable release control signal if the enable release control signal is received, and then output an enable release signal; and a signal output unit configured to control, if the manual release signal or the enable release signal is received, the motor of the robot to release a band brake.

The utility model discloses a simple tunnel short side wall longitudinal steel edge water stop belt tensioning device which comprises a rotating support, a rolling assembly is arranged on the rotating support, a clamping mechanism is installed on the rolling assembly through a connecting mechanism, the rolling assembly comprises a take-up wheel, the take-up wheel is installed on the rotating support in a rotating mode, and the clamping mechanism is installed on the rotating support. A rotating shaft is arranged on one side of the take-up wheel, a brake wheel is installed at the end of the rotating shaft, a rotating rod is installed at the end, away from the take-up wheel, of the brake wheel, a steel rope is wound around the take-up wheel, and the end of the steel rope is installed on the rotating support. The rotating rod is rotated to drive the take-up wheel to rotate, a water stop belt is tensioned, after the water stop belt is tensioned to a certain degree, the key is pressed down, the oil pump drives the brake pad to move, the brake pad extrudes the brake wheel, the brake wheel is fixed, and the take-up wheel is prevented from rotating.

The utility model discloses an unwinding and braking device for a skip car, which relates to the technical field of tire component manufacturing and comprises a station frame, an unwinding component and a braking component, and the unwinding component and the braking component are respectively positioned on two sides of the station frame. The unwinding assembly comprises a guide rail, a mounting base, an unwinding gear and an unwinding motor, the guide rail is transversely fixed to the outer side of the station frame, the mounting base is slidably mounted on the guide rail, and the unwinding gear and the unwinding motor are both mounted on the mounting base and are in chain transmission; the brake assembly comprises a first expansion piece, a swing arm and a brake band-type brake, one end of the swing arm is hinged to one side of the station frame, the brake band-type brake is installed at the other end of the swing arm, and a damping roller used for being matched with the wheel edge of the storage wheel is installed on an output shaft of the brake band-type brake. The gear shaft of the unwinding gear and the gear shaft of the skip car gear are located on the same horizontal plane, the unwinding gear is driven by the mounting base to move horizontally so that tight meshing of the unwinding gear and the skip car gear can be achieved, and the phenomenon that the unwinding gear and the skip car gear are disengaged in the running process is avoided.

The utility model relates to the technical field of trundles, in particular to a wire brake belt brake trundle. The rolling wheel is rotatably arranged at the bottom of the support, the driving plate is rotatably arranged at the top of the support, the spring piece is rotatably arranged in the support, the sheep eye bolt is arranged on the driving plate in a sliding and clamping mode and used for driving the spring piece to press the rolling wheel so as to achieve braking, and the reset spring is arranged on the sheep eye bolt in a sleeving mode and used for driving the spring piece to reset. The brake rope and the sheep eye bolt are used for driving the spring piece to brake, so that an operator can control the brake at the position far away from the caster, and the problem that the caster swings to a specific angle and cannot brake can be solved; meanwhile, the problem that the brake pedal is easy to damage is solved, and the durability of the trundle is improved.

The invention discloses an inertia vibration device for small berry vibration harvesting and a harvester. The inertia vibration device comprises a vibration power assembly, a vibration shaft assembly and a vibration disc assembly. The vibration power assembly comprises a belt brake, and the belt brake is composed of a brake belt, a balance rod, damping rubber, a connecting rod and an elastic element. The brake belt is sleeved on the brake disc, and the balance rod is rotatably connected with two ends of the brake belt. A mounting disc is arranged in the middle of the balance rod, the mounting disc and the balance rod are fixed together, and a first stop block is arranged on the inner wall of the mounting disc; a disc is arranged at one end of the connecting rod, a second check block is arranged at the bottom of the disc, and a first rotating shaft is fixed to the center of the disc and rotationally matched with the mounting disc. A cavity is formed by the disc and the mounting disc, and two pieces of damping rubber are arranged in the cavity; the two damping rubbers are symmetrically placed in the cavity; the other end of the connecting rod penetrates through an elastic element and is provided with a thread which is matched with a nut.

A mooring machine according to one embodiment includes: a drum around which a mooring rope is wound; a band brake (3) that switches whether to allow or prohibit rotation of the drum; and a pin-type load cell (5) that is incorporated in the band brake (3) and has a first end part and a second end part. A cable (55) is connected to the first end part of the load cell (5). The mooring machine further includes a cover (7) covering the first end of the load cell (5).

The invention provides a self-adaptive pretightening force adjustable double-acting belt brake which comprises a belt brake assembly arranged on the periphery of a brake drum, the belt brake assembly is composed of an outer shell, a brake belt, anchoring connecting mechanisms and a self-adaptive adjusting mechanism, the brake belt is connected to an inner cavity of the outer shell through the two anchoring connecting mechanisms, and the self-adaptive adjusting mechanism is arranged in the outer shell. The brake belt is arranged on the periphery of the brake drum in a surrounding mode, an initial gap is preset between the brake belt and the brake drum, it is ensured that no contact exists in the non-brake state, the two anchoring connecting mechanisms are symmetrically arranged on the outer side of the brake belt, under the action of the two anchoring connecting mechanisms, the brake belt is allowed to slide slightly in the tangential direction when stressed, stress concentration is avoided, and the brake performance is improved. The self-adaptive adjusting mechanism is connected between the brake belt and the outer shell, the brake operation of the brake belt on the periphery of the brake drum on the brake drum is completed through the self-adaptive adjusting mechanism, and high efficiency and convenience are achieved.

The utility model relates to the technical field of elevators, in particular to an elevator brake device which comprises a brake assembly, a brake shell is arranged on the periphery of the brake assembly, a wire outlet assembly is arranged in the brake shell, and the wire outlet assembly is located above the brake assembly. According to the elevator brake device, the stepping motor is started, power is transmitted to the take-up reel through the driving wheel, the synchronous belt and the driven synchronous wheel, when the brake action needs to be executed, the built-in switch in the take-up reel lowers the trigger switch according to extrusion of the simulation cable on the built-in switch, and when the built-in switch reaches the preset position, the built-in switch is switched on. The electromagnetic band brake rapidly holds the brake inner drum to realize rapid braking, and an upper limit switch in the wire outlet assembly monitors the limit position of the simulation cable to prevent excessive winding and unwinding.

The utility model belongs to injection molding machine locking device technical field especially relates to a kind of integrated clutch booster mechanism and its locking device, including base;Base is equipped with clutch device, and clutch device includes guide pillar;Guide pillar one end is fixed, and the other end is set in base, and guide pillar is equipped with the clutch assembly that can be positioned with guide pillar and is connected, clutch assembly can be close to or away from guide pillar, close, clutch assembly is positioned and is connected in guide pillar, away, clutch assembly removes the positioning and is connected of guide pillar;Clutch device bottom is also equipped with booster anti-expansion device, and booster anti-expansion device is used to prevent mould expansion, and booster anti-expansion device is integrally arranged with base, for reducing booster anti-expansion device height. Through the integrated setting of hydraulic oil cylinder and base, the height of the workbench can be further reduced, and the user can install the mold conveniently.

A mooring device of a floating structure according to the present disclosure, the mooring device comprising: a sprocket on which a mooring chain is wound; a brake band surrounding an outer circumference of the sprocket; a brake actuator that provides a pulling force to the brake band such that the brake band brakes by pressing the outer circumference of the sprocket; a tension detection section that measures a tension applied to the brake band; and a controller that controls the brake actuator to reduce a pulling force pulling the brake band when a measurement value measured by the tension detection portion exceeds a set value.

The invention discloses an active disc coupling with a braking function. The device comprises an induction disc rotatably installed on a motor tail shaft, a magnetic steel disc fixed on the motor tail shaft and corresponding to the induction disc, and a brake used for braking the induction disc. The brake comprises a coil assembly installed on the motor tail cover, an armature installed on the coil assembly in a floating mode and a brake plate fixed to the armature, and the armature can move up and down along with power-off and power-on of the coil assembly so as to drive the brake plate to make contact with or be separated from the induction disc. The brake device has the advantages that when braking is needed, the brake plate is driven by the power-losing armature to directly brake the induction disc, then the motor shaft is indirectly braked through the hindering effect generated by magnetic coupling between the induction disc and the magnetic steel disc, the braking process is smoother, the motor shaft can rotate again after bearing large torque instead of being locked, and the braking effect is better. Therefore, equipment is prevented from being damaged due to the fact that torque exists but the motor shaft cannot rotate, and actual use requirements are better met.

This utility model relates to the field of ore smelting technology, and in particular to a two-half split combined brake, including a bracket and support rods. The bracket has two support rods rotatably connected internally via pins. The end of the upper support rod is fixedly connected to the first brake plate. A nut drives a screw to rotate, separating the screw from the nut, pulling the sleeve, and rotating the sleeve and sliding rod. The sleeve, sliding rod, and spring are no longer connected to the first and second ear plates. Rotating the first and second ear plates separates the first and second brake plates from the outside of the electric arc furnace motor, allowing the brake to be removed for maintenance. This innovative design transforms the original integral electrode brake into a two-half split bolt-connected combined brake. During maintenance and disassembly, it is divided into two small parts, facilitating brake disassembly and maintenance, and significantly reducing maintenance and downtime. The maintenance time for the brake equipment is significantly reduced, maintenance quality is improved, and maintenance costs are lowered.

The utility model discloses an elevator running state detection and safety guarantee device based on temperature vibration, and relates to the technical field of elevators, the elevator running state detection and safety guarantee device comprises an elevator shaft and a machine room located at the top of the elevator shaft, a guide rail support is arranged in the elevator shaft, a car frame is movably installed in the guide rail support, and a car body is arranged in the middle of the car frame. A bearing beam is arranged at the top of the guide rail support, and a traction machine is fixedly installed at the top of the bearing beam. According to the brake state monitoring device, the temperature measuring assembly is arranged, especially the non-contact temperature sensor and the thermocouple are used for monitoring the temperature of the surface of the brake disc and the temperature of the brake pad of the band-type brake respectively, so that state monitoring of a brake system is indirectly achieved, and when the temperature of any part of the brake pad or the brake disc is abnormally high, the brake pad or the brake disc is not damaged. If yes, the brake system may have a friction condition, so that the temperature is abnormal, and a maintainer can maintain the brake system in time.

The utility model discloses an automatic compensation type belt brake supporting device for a large winch, which comprises a winding drum hub and a loose edge steel belt surrounding the periphery of the winding drum hub, a plurality of inner supporting devices are arranged on the winding drum hub, first rollers are arranged in the inner supporting devices, the first rollers move along a preset path to protrude out of the peripheral surface of the winding drum hub, and the loose edge steel belt is arranged on the loose edge steel belt. A support is formed between the reel hub and the loose edge steel belt; the multiple inner supporting devices and the winding drum hub rotate coaxially, so that the multiple first rolling wheels form continuous surrounding movable supporting on the circumferential gap between the winding drum hub and the loose edge steel belt. By means of the multiple sets of devices, rolling of the idler wheels in the loose edge steel belt is achieved, the brake and the friction belt are evenly disengaged or closed, and therefore the loose braking function and the braking function of the large winch loose edge steel belt overhead type brake are achieved. The brake supporting device reasonably utilizes space, is compact in structural arrangement and small in installation difficulty, saves cost, and meets the use requirements of a large winch brake.

The utility model relates to a surveying and mapping instrument support, which belongs to the technical field of surveying and mapping supports and comprises a support moving box body, a moving bottom plate and a surveying and mapping instrument mounting base, the support moving box body is rotatably connected with two ball screws, a band-type brake motor is fixedly mounted on the support moving box body, a driving end of the band-type brake motor is fixedly connected with the ball screws, and a driving end of the band-type brake motor is fixedly connected with the moving bottom plate. The ball screws on the two sides are in threaded connection with lead screw nuts, universal wheels are fixedly installed on the movable bottom plate, synchronous wheels are fixedly installed on the ball screws on the two sides, and the synchronous wheels on the two sides are in transmission connection with a synchronous belt. The bottom of the surveying and mapping instrument support is provided with the foldable pulleys which can be adjusted out in the transportation process, so that the surveying and mapping instrument support is convenient to move in a surveying and mapping area and can be stored when moving to a surveying and mapping point position, surveying and mapping can be carried out by stably placing the surveying and mapping instrument support on the ground, and the surveying and mapping instrument support is suitable for outdoor surveying and mapping operation in a large-area area. Manpower can be effectively reduced; and the working efficiency is improved.

The invention relates to the elevator technology, in particular to a device and method for band-type brake control. According to one aspect of the disclosure, a device for band-type brake control is provided. The apparatus includes a first branch and a second branch connected in parallel with the first branch. The first branch and the second branch respectively comprise a first band-type brake coil and a first switch element which are connected in series and a second band-type brake coil and a second switch element which are connected in series. The apparatus further includes a third switching element connected between the power source and the first and second branches, the third switching element configured to switch the power source on or off the first and second branches in response to a status of the elevator safety link. In the device, when the power supply is connected with the first branch circuit and the second branch circuit, the power supply of the power supply to the first band-type brake coil and the power supply of the power supply to the second band-type brake coil are controlled through the first switch element and the second switch element respectively. In particular, the control signal for the first switching element and the second switching element comprises a pulse width modulated signal.

The utility model relates to the technical field of heavy-load trusses, in particular to a heavy-load truss Z-axis anti-falling mechanism which comprises a motor, a worm and gear speed reducer and a Z bearing shaft, the motor is connected with the input end of the worm and gear speed reducer, the motor is provided with a band-type brake, the output end of the worm and gear speed reducer is provided with a gear, and the Z bearing shaft is connected with the gear. The Z bearing shaft is provided with a rack extending in the axial direction of the Z bearing shaft, the gear is meshed with the rack, the worm gear and worm speed reducer has the self-locking characteristic, when the motor stops running, the gear is self-locked by the worm gear and worm speed reducer to be matched with the rack to limit falling of the Z bearing shaft, and therefore the Z bearing shaft is prevented from falling. And the motor is provided with a band-type brake and is self-locked with the worm and gear speed reducer to form double anti-falling, the reliability is high, and the Z bearing shaft is not prone to falling to cause accidents.