CN115108487A - Anti-falling safety device of crane - Google Patents
Anti-falling safety device of crane Download PDFInfo
- Publication number
- CN115108487A CN115108487A CN202211044546.8A CN202211044546A CN115108487A CN 115108487 A CN115108487 A CN 115108487A CN 202211044546 A CN202211044546 A CN 202211044546A CN 115108487 A CN115108487 A CN 115108487A
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- China
- Prior art keywords
- rotating wheel
- brake
- clamping
- groove
- adjusting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/88—Safety gear
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D5/00—Braking or detent devices characterised by application to lifting or hoisting gear, e.g. for controlling the lowering of loads
- B66D5/02—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes
- B66D5/04—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes actuated by centrifugal force
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D5/00—Braking or detent devices characterised by application to lifting or hoisting gear, e.g. for controlling the lowering of loads
- B66D5/02—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes
- B66D5/06—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes with radial effect
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D5/00—Braking or detent devices characterised by application to lifting or hoisting gear, e.g. for controlling the lowering of loads
- B66D5/02—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes
- B66D5/06—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes with radial effect
- B66D5/08—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes with radial effect embodying blocks or shoes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D5/00—Braking or detent devices characterised by application to lifting or hoisting gear, e.g. for controlling the lowering of loads
- B66D5/02—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes
- B66D5/18—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes for generating braking forces which are proportional to the loads suspended; Load-actuated brakes
- B66D5/20—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes for generating braking forces which are proportional to the loads suspended; Load-actuated brakes with radial effect
Abstract
The invention relates to the field of hoisting devices, in particular to a falling-prevention safety device of a crane. The hawser cup joints in the fixed pulley, the lifting hook and the one end rigid coupling of hawser, and the clutch blocks slides along the radial direction of rotating wheel and inserts on rotating the wheel, and the both ends of rotating the wheel all are equipped with a plurality of clutch blocks. The cable is wound on the adjusting plate; each clamping linkage assembly is connected with one end of one friction block and one end of one adjusting plate, and the linkage assemblies clamp the friction blocks in an initial state, so that when the rotating speed of the rotating wheel reaches a preset value, the friction blocks are separated from the clamping of the clamping linkage assemblies, and when the adjusting plates slide towards the axis of the rotating wheel, the clamping linkage assemblies enable the outward initial speed of the friction blocks to be increased. When the lifting hook rises or falls at an excessively high speed, the friction force between the friction block and the lifting rod is increased when the initial speed of the friction block is increased, so that the rotating speed of the rotating wheel is limited to be excessively high, and the lifting hook is lifted at a safe speed to improve the safety of the device.
Description
Technical Field
The invention relates to the field of hoisting devices, in particular to a falling-prevention safety device of a crane.
Background
The crane is a hoisting machine for vertical transportation of building materials, and is mainly used for vertical transportation of concrete, prefabricated parts, bricks, aggregate materials, mortar, steel bars and other building materials in civil building construction operation with the building height of less than 50 meters. The traditional construction elevator does not have the function of falling prevention, and can bring fatal injury to the safety of constructors in case of accidents.
Disclosure of Invention
The invention provides a falling-prevention safety device for a crane, which aims to solve the problem of lower safety performance of the conventional device.
The invention discloses a falling-prevention safety device of a crane, which adopts the following technical scheme:
a crane anti-falling safety device is used for a crane and further comprises a lifting rod, a lifting assembly, a rotating wheel and an adjusting assembly; the lower end of the lifting rod is arranged on the crane; the lifting assembly comprises a fixed pulley, a cable and a lifting hook; the fixed pulley is fixed at the upper end of the lifting rod; the cable is sleeved on the fixed pulley; the lifting hook is fixedly connected with one end of the mooring rope; the rotating wheel is rotatably arranged on the lifting rod; the adjusting assembly comprises a plurality of adjusting plates, a plurality of friction blocks and a plurality of clamping linkage assemblies; the friction blocks are inserted on the rotating wheel in a sliding manner along the radial direction of the rotating wheel, and a plurality of friction blocks are arranged at two ends of the rotating wheel; the friction block slides outwards to make the friction block in frictional contact with the lifting rod; the adjusting plates can be arranged in a sliding manner along the radial direction of the rotating wheel and are uniformly distributed along the circumferential direction of the rotating wheel, and the cable is wound on the adjusting plates; each clamping linkage assembly is connected with one end of one friction block and one end of one adjusting plate, and the linkage assemblies clamp the friction blocks in an initial state, so that when the rotating speed of the rotating wheel reaches a preset value, the friction blocks are separated from the clamping of the clamping linkage assemblies, and when the adjusting plates slide towards the axis of the rotating wheel, the clamping linkage assemblies enable the outward initial speed of the friction blocks to be increased.
Further, the clamping linkage assembly comprises a clamping piece and a linkage piece; fixing discs are arranged at two ends of the rotating wheel, and a plurality of adjusting grooves are formed in each fixing disc; one end of the friction block can extend into the adjusting groove, and a clamping groove is formed in the peripheral wall of the friction block positioned in the adjusting groove; the clamping piece comprises a connecting rod, a force storage spring, two hinged rods, two clamping springs and two clamping blocks; the two clamping blocks are symmetrically arranged in the clamping grooves of the friction block; the connecting rod is arranged at the bottom of the adjusting groove; one end of the force storage spring is connected with the friction block, and the other end of the force storage spring is connected with the connecting rod; one end of the hinge rod is hinged with one end of the connecting rod, and the other end of the hinge rod is contacted with the upper wall of the adjusting groove so as to drive the other end of the hinge rod to slide towards the direction close to the friction block when the connecting rod moves towards the direction close to the friction block; one end of the clamping spring is connected with the other end of the hinge rod, and the other end of the clamping spring is connected with the clamping block; the linkage piece is used for driving the adjusting rod to slide towards the direction close to the friction block when the adjusting plate moves towards the direction close to the axis of the rotating wheel.
Further, the linkage piece comprises a transmission gear, a first rack and a second rack; the bottom of the adjusting groove extends to the axle center along the radial direction of the fixed disc to form a transmission groove; the first rack is arranged in the transmission groove and is fixedly connected with the connecting rod; the transmission gear is rotatably arranged in the transmission groove and is meshed with the first rack; the second rack is slidably arranged in the transmission groove and meshed with the transmission gear; the second rack is connected with the adjusting plate.
Furthermore, two rotating grooves are fixedly arranged on the lifting rod; the fixed wheels at the two ends of the rotating wheel are respectively and rotatably inserted in a rotating groove; the friction block may be in frictional contact with an inner wall of the rotation groove.
Further, the anti-falling safety device for the crane further comprises a braking mechanism; the brake mechanism comprises a brake sleeve, a brake spring and a brake ring; the braking sleeve is rotatably sleeved on the rotating wheel; the adjusting plate is positioned on the outer side of the adjusting cylinder, and the adjusting plate and the brake sleeve synchronously rotate; the brake spring is sleeved on the rotating wheel in a rotatable and axially slidable manner and is positioned between the brake sleeve and the rotating wheel; one end of the brake spring is connected with the brake sleeve, and the other end of the brake spring is connected with the rotating wheel; friction transmission is carried out between the brake spring and the brake sleeve in the initial state; the brake ring is used for driving the outer diameter of the brake spring to be reduced when the brake sleeve and the rotating wheel rotate relatively.
Furthermore, a spiral groove is arranged on the rotating wheel; the brake ring is sleeved on the rotating wheel and inserted in the spiral groove, so that when the brake ring rotates relative to the rotating wheel, the brake ring can slide along the axial direction of the brake wheel; the brake ring is connected with the brake spring to drive the brake spring to slide along the axial direction of the rotating wheel.
Furthermore, both ends of the brake spring are provided with convex blocks; two ends of the brake sleeve are fixedly provided with brake plates; the brake plate is provided with a first clamping groove, and the projection can be inserted into the first clamping groove; the fixed disc is provided with a second clamping groove, and the convex block can be inserted into the second clamping groove, so that when one convex block is inserted into the first clamping groove, the other convex block is inserted into the second clamping groove.
Furthermore, a plurality of synchronous grooves are arranged on the brake plate; the synchronous groove is a straight groove and is arranged along the radial direction of the fixed disc; both ends of the adjusting plate are provided with connecting rods; each two synchronous grooves are inserted in one synchronous groove; and a return spring is arranged in each synchronous groove, one end of the return spring is fixedly connected with the connecting rod, and the other end of the return spring is fixedly connected with one side of the synchronous groove close to the axle center of the brake plate.
The invention has the beneficial effects that: the invention relates to a falling-prevention safety device of a crane, which is used for a crane and is provided with a lifting rod, a lifting assembly, a rotating wheel and an adjusting assembly, wherein the larger the mass of an object borne by the lifting hook is, the larger the distance of the adjusting plate moving to the axis of the rotating wheel by the driving of a pull rope is. The initial state that sets up of centre gripping linkage subassembly is used for carrying out the centre gripping to the clutch blocks, simultaneously along with the regulating plate slides to the axle center direction of rotating the wheel for the initial velocity of clutch blocks moves the grow. When the lifting hook ascends or descends at an excessive speed, the friction block breaks through the clamping of the clamping linkage assembly to enable the friction block to be in friction contact with the lifting rod, when the initial speed of the friction block is higher, the friction force between the friction block and the lifting rod is higher, the rotating speed of the rotating wheel is limited to be too high, and then the lifting hook is lifted at a safe speed to increase the safety of the device.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural view of an embodiment of a fall protection safety device for a crane according to the present invention;
FIG. 2 is a schematic diagram of an adjusting assembly of an embodiment of a fall protection safety device for a crane according to the present invention;
FIG. 3 is a schematic diagram of the structural relationship between the adjusting assembly and the rotating wheel of the embodiment of the fall-prevention safety device for a crane of the present invention;
FIG. 4 is a schematic structural diagram of a rotating wheel of an embodiment of a fall protection safety device for a crane according to the present invention;
FIG. 5 is a schematic structural view of a fixing plate of an embodiment of the anti-falling safety device of the crane of the invention;
FIG. 6 is a side cross-sectional view of an adjustment assembly of an embodiment of a fall protection safety device for a crane of the present invention;
FIG. 7 is an enlarged view of a portion of FIG. 5 at A;
FIG. 8 is a schematic structural diagram of a braking spring of an embodiment of a fall protection safety device for a crane according to the present invention;
in the figure: 100. a lifting hook; 200. a lifting rod; 300. a drive motor; 400. an adjustment assembly; 500. a fixed pulley; 600. a crane; 410. a rotating groove; 420. an adjusting plate; 430. a rotating wheel; 431. a helical groove; 432. fixing the disc; 440. a brake sleeve; 441. a return spring; 442. a brake spring; 443. a bump; 444. a brake ring; 445. a brake plate; 450. a clamping linkage assembly; 451. a transmission gear; 452. pressing a plate; 453. a connecting plate; 454. a hinged lever; 455. a clamping block; 456. a friction block; 457. a power storage spring; 458. a first rack; 459. a second rack.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of a crane fall prevention safety device of the present invention, as shown in fig. 1 to 8, is used on a crane 600 and includes a lifting rod 200, a lifting assembly, a rotating wheel 430 and an adjusting assembly 400. The lower end of the lifting rod 200 is provided on a crane 600, and in particular, the lower end of the lifting rod 200 is connected to the crane, and the extended length and lifting angle of the lifting rod 200 can be controlled by a control system of the crane 600.
The lifting assembly includes a crown block 500, a hook 100, and a cable. A fixed pulley 500 is fixed to the mast 200 at the uppermost end of the mast, a cable is looped around the fixed pulley 500, and the hook 100 is fixedly coupled to one end of the cable. The lifting assembly further comprises a driving motor 300, the driving motor 300 is disposed on the crane, and the driving motor 300 is connected to the other end of the cable to drive the cable to be released and retracted when the driving motor 300 is started, thereby driving the lifting hook 100 to ascend or descend. A rotating wheel 430 is rotatably provided on the mast under the lower half of the mast 200, the axis of the rotating wheel 430 and the axis of the fixed pulley 500 are parallel to each other, and the cable may be wound around the rotating wheel 430.
The adjusting plates 420 are arranged in a sliding manner along the radial direction of the rotating wheel 430 and are uniformly distributed along the circumferential direction of the rotating wheel 430, the cable is wound on the adjusting plates 420, the adjusting plates 420 are arc-shaped plates and are coaxial with the rotating wheel 430, the number of the adjusting plates 420 is four, the cable is wound on the outer side of the circumference enclosed by the adjusting plates 420, so that when the weight of the lifting platform is larger, the pressure of the pull rope on the adjusting plates 420 is increased, the adjusting plates 420 receive the pressure towards the axial center direction of the rotating wheel 430, the adjusting plates 420 slide towards the axial center of the rotating wheel 430, when an object lifted by the mounting platform is heavier, each clamping linkage assembly 450 is driven to be connected with one friction block 456 and one end of one adjusting plate 420, and the initial state linkage assembly clamps the friction block 456 to prevent the friction block 456 from sliding outwards under the rotating state of the rotating wheel 430, so that when the rotating speed of the rotating wheel 430 reaches a preset value, the friction block 456 is separated from the clamping linkage assembly 450, meanwhile, when the adjusting plate 420 slides towards the axis of the rotating wheel 430, the clamping linkage assembly 450 increases the initial outward speed of the friction block 456, and the larger the sliding distance of the adjusting plate 420 towards the axis of the rotating wheel 430 is, the larger the initial speed of the friction block 456 is, and further the larger the friction force between the friction block 456 and the lifting rod 200 is, so that the descending speed of the lifting platform is kept within the safe speed.
In this embodiment, as shown in fig. 5 to 7, the clamping linkage assembly 450 includes a clamping member and a linkage member. The two ends of the rotating wheel 430 are provided with fixed disks 432, each fixed disk 432 is provided with a plurality of adjusting grooves, the adjusting grooves are in a rectangular groove shape, one end of each friction block 456 can extend into the adjusting grooves, clamping grooves are formed in the peripheral walls of the friction blocks 456 in the adjusting grooves, the two clamping grooves are symmetrically arranged on the peripheral walls of the friction blocks 456, and the side, close to the axis of the rotating wheel 430, of each clamping groove is an inclined surface. The clamp includes a connecting rod, a power spring 457, two hinged rods 454, two clamp springs, and two clamp blocks 455. The two clamping blocks 455 are symmetrically disposed in the slots of the friction block 456, and the inclined surfaces of the slots facilitate the friction block 456 to be separated from the clamping blocks 455. The connecting rod is arranged at the bottom of the adjusting groove, and the initial state of the connecting rod is positioned at the bottom of the adjusting groove and can slide in the adjusting groove along the radial direction of the fixed disk 432. One end of the power storage spring 457 is connected with the friction block 456, the other end is connected with the connecting rod, when the connecting rod slides to one side far away from the axle center of the fixed disk 432, the power storage spring 457 contracts to store power, and then the friction block 456 is ejected out of the fixed disk 432, so that the initial speed is higher. One end of the hinge rod 454 is hinged to one end of the connecting rod, and the other end contacts the upper wall of the adjustment groove to drive the other end of the hinge rod 454 to slide toward the friction block 456 when the connecting rod moves toward the friction block 456, and the connecting rod and the two hinge rods 454 form an isosceles trapezoid (as shown in fig. 5) to make the ends of the two hinge rods 454 away from the connecting rod approach each other when the connecting rod slides toward the axis away from the fixed disk 432. One end of the clamping spring is connected with the other end of the hinged rod 454, the other end of the clamping spring is connected with the clamping block 455, so that when the ends of the two hinged rods 454 far away from the connecting rod are close to each other, the hinged rod 454 presses the clamping spring to make the clamping force of the clamping block 455 to the friction block 456 large, and meanwhile, due to the power storage of the power storage spring 457, the outward pushing force is applied to the friction block 456, and then under the matching of the power storage spring 457 and the clamping spring, the force of the friction block 456 separated from the clamping of the clamping block 455 is kept constant.
The link member is used to drive the adjusting lever to slide toward the friction block 456 when the adjusting lever 420 moves toward the axial center of the rotating wheel 430. The linkage includes a drive gear 451, a first rack 458 and a second rack 459. The bottom of the adjusting groove extends to form a transmission groove along the axis of the fixed disk 432 in the radial direction of the fixed disk 432, the adjusting groove is communicated with the transmission groove, and one end of the transmission groove, which is far away from the axis of the fixed disk 432, is positioned in the middle of the adjusting groove. The first rack 458 is disposed in the transmission groove and fixedly connected to the connecting rod to drive the connecting rod to slide synchronously when the first rack 458 slides along the rotation groove 410. The transmission gear 451 is rotatably disposed in the transmission groove, and the transmission gear 451 is engaged with the first rack 458 to slide the first rack 458 when the transmission gear 451 rotates. The second rack 459 is slidably disposed in the transmission groove and engaged with the transmission gear 451, and when the second rack 459 slides towards the axis of the fixed plate 432 in the transmission groove, the transmission gear 451 drives the first rack 458 to slide towards the axis far away from the fixed plate 432. The second rack 459 is connected to the adjustment plate 420 to slide the first rack 458 when the adjustment plate 420 slides.
In this embodiment, as shown in fig. 1 to 3, two rotation grooves 410 are fixedly formed in the lifting rod 200, the fixed wheels at both ends of the rotation wheel 430 are rotatably inserted into one rotation groove 410, the friction block 456 is in frictional contact with the inner wall of the rotation groove 410, and when the friction block 456 is in contact with the inner wall of the rotation groove 410, the rotation wheel 430 is in frictional contact with the rotation groove of the lifting rod 200.
In this embodiment, as shown in fig. 3 to 8, the fall prevention safety device for a crane further includes a braking mechanism; two ends of the adjusting plate 420 are respectively and fixedly provided with a pressing plate 452, the pressing plates 452 are arc-shaped plates, the pressing plates 452 are fixedly connected with the second rack 459 and are connected with the adjusting plate 420, so that the adjusting plate 420 drives the second rack 459 to move through the pressing plates 452. The brake mechanism includes a brake sleeve 440, a brake spring 442, and a brake ring 444. The brake sleeve 440 is rotatably fitted over the rotating wheel 430, the adjustment plate 420 is located outside the adjustment cylinder, and the adjustment plate 420 and the brake sleeve 440 rotate synchronously. A brake spring 442 is rotatably and axially slidably fitted over the rotary wheel 430 between the brake sleeve 440 and the rotary wheel 430, and one end of the brake spring 442 is connected to the brake sleeve 440 and the other end is connected to the rotary wheel 430. The initial state is a friction transmission between the braking spring 442 and the braking sleeve 440 such that the outer diameter of the braking spring 442 is reduced when both ends of the braking spring 442 are relatively rotated. The brake ring 444 serves to induce a reduction in the outer diameter of the brake spring 442 when the brake sleeve 440 and the rotatable wheel 430 are relatively rotated. The cable drives the adjusting plate 420 to rotate, the adjusting plate 420 drives the braking sleeve 440 to rotate, the braking sleeve 440 drives the braking spring 442 to rotate through friction transmission, and since two ends of the braking spring 442 are respectively connected with the braking sleeve 440 and the rotating wheel 430, the braking spring 442 drives the rotating wheel 430 to rotate. When the driving motor 300 fails or the controller of the driving motor 300 fails, the lifting speed of the lifting hook 100 is rapidly increased, and then the cable drives the adjusting plate 420 to increase, so that a rotational speed difference exists between the braking sleeve 440 and the rotating wheel 430, and further the outer diameter of the braking spring 442 is reduced, and the braking spring 442 locks the rotating wheel 430, so that the rotating wheel 430 and the braking sleeve 440 are synchronized to play a buffering role.
The rotating wheel 430 is provided with a spiral groove 431, the brake ring 444 is sleeved on the rotating wheel 430 and is inserted into the spiral groove 431, so that when the brake ring 444 rotates relative to the rotating wheel 430, the brake ring 444 can slide along the axial direction of the brake wheel, and the brake ring 444 is connected with the brake spring 442 to drive the brake spring 442 to slide along the axial direction of the rotating wheel 430. (as shown in fig. 6), the initial state braking spring 442 has a left end connected to the braking sleeve 440 and a right end connected to the rotating wheel 430, so as to drive the two ends of the spring to rotate relatively during the accelerated falling of the lifting hook 100, thereby reducing the outer diameter of the braking spring 442. During the process of accelerating the ascending of the upgrading platform, the brake ring 444 drives the left end of the brake spring 442 to be connected with the rotating wheel 430, and the right end of the brake spring 442 is connected with the brake sleeve 440, so that the outer diameter of the brake spring 442 is still reduced when the two ends of the driving spring rotate relatively.
In this embodiment, as shown in fig. 6 and 8, the braking spring 442 is provided with projections 443 at both ends thereof. The two ends of the braking sleeve 440 are fixedly provided with braking plates 445, the braking plates 445 are annular, the braking plates 445 are provided with first slots, and the protrusions 443 can be inserted into the first slots. The fixed plate 432 is provided with a second slot, and the protrusion 443 can be inserted into the second slot, so that when one protrusion 443 is inserted into the first slot, the other protrusion 443 is inserted into the second slot. The brake plate 445 is provided with a plurality of synchronization grooves, which are straight grooves, arranged in the radial direction of the fixed disk 432. Two ends of the adjusting plate 420 are provided with connecting rods, each two connecting rods are inserted into one of the synchronization slots, and the connecting rods are in contact with one side of the pressing plate 452 far away from the axis. Each synchronous groove is internally provided with a return spring 441, one end of each return spring 441 is fixedly connected with the connecting rod, and the other end of each return spring 441 is fixedly connected with one side of the synchronous groove close to the axle center of the brake plate 445.
When the crane 600 works normally, the equipment items to be lifted or lowered are hooked by the lifting hook 100, the driving motor 300 is started, and the motor rotates to drive the cable to contract or release, so as to drive the lifting hook 100 to ascend or descend.
When the weight of the object connected with the lifting hook 100 is large, the gravity of the lifting hook 100 applies pressure to the adjusting plate 420 in the axial direction through the cable wound on the adjusting plate 420, so that the adjusting plate 420 slides in the axial direction along the radial direction of the fixed disk 432, the adjusting plate 420 drives the connecting plate 453 to move to one side of the axial direction far away from the rotating wheel 430 through the first rack 458, the second rack 459 and the transmission gear 451, so that the clamping force of the clamping block 455 to the friction block 456 is increased, meanwhile, the force storage spring 457 contracts to store force, so that the initial speed of the friction block 456 during ejection is increased, the positive pressure between the friction block 456 and the rotating groove 410 during ejection is increased, the friction force is increased, the rotating speed of the rotating wheel 430 is reduced, and the speed of the lifting hook 100 is reduced.
The abnormal work of the crane 600 is divided into two cases 1, the driving motor 300 fails, and the lifting hook 100 falls down; 2. during the ascending process of the lifting hook 100, the driving motor 300 loses the control signal to make the lifting hook 100 quickly impact against the top.
The adjusting plate 420 is rotated counterclockwise by the cable when the lifting hook is lifted, and thus the braking sleeve 440 and the rotating wheel 430 are rotated counterclockwise. When the driving motor 300 loses power, the lifting hook 100 slides downwards, and the cable drives the adjusting plate 420 to rotate clockwise, so that the rotating wheel 430 and the braking sleeve 440 rotate clockwise synchronously. At this time, the driving motor 300 is disabled, the rotating wheel 430 stalls, and the rotating wheel 430 is driven by the lifting hook 100 to rotate faster, so that the friction block 456 breaks through the clamping of the clamping block 455, and the friction block 456 extends out of the fixed disk 432 and is in frictional contact with the inner wall of the rotating groove 410. Meanwhile, due to the rapid falling of the lifting hook 100, the braking sleeve 440 and the rotating wheel 430 relatively rotate, so that the braking ring 444 drives the braking spring 442 to approach to the left end under the action of the spiral groove 431, at this time, the two ends of the braking spring 442 are twisted under the action of the braking sleeve 440 and the rotating wheel 430 to reduce the outer diameter of the braking spring 442, and the rotating wheel 430 and the braking sleeve 440 are synchronously braked. At this time, the rotation wheel 430 rapidly decreases the rotation speed of the brake sleeve 440, and as the centrifugal force applied to the friction pad 456 becomes smaller, the friction force between the friction pad 456 and the rotation groove 410 becomes smaller. After a period of deceleration, the lifting hook 100 gradually reaches a lower speed, at which point the friction and gravity forces are balanced to allow the lifting hook 100 to descend smoothly.
Similarly, during the lifting of the lifting hook 100, the driving motor 300 is out of control, and the speed of lifting the lifting hook 100 upward is also reduced.
When the lifting hook 100 is lifted, the driving motor 300 loses the control signal to make the lifting hook 100 quickly impact. The friction block 456 is ejected and the brake sleeve 440 and the rotating wheel 430 move relatively, so that the brake ring 444 pushes the brake spring 442 to the right side, at which time the brake spring 442 is further twisted by the brake sleeve 440 and the rotating wheel 430, at which time the sum of the friction force and the weight of the lifting platform overcomes the power of the driving motor 300, so that the lifting speed of the lifting hook 100 is reduced to a safe speed until the lifting hook 100 reaches the highest point.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. The utility model provides a hoist prevents safety device that falls, the device is used for the crane which characterized in that: further comprising:
the lower end of the lifting rod is arranged on the crane;
the lifting assembly comprises a fixed pulley, a cable and a lifting hook; the fixed pulley is fixed at the upper end of the lifting rod; the cable is wound on the fixed pulley; the lifting hook is fixedly connected with one end of the mooring rope;
the rotating wheel is rotatably arranged on the lifting rod;
the adjusting assembly comprises a plurality of adjusting plates, a plurality of friction blocks and a plurality of clamping linkage assemblies; the friction blocks are inserted on the rotating wheel in a sliding manner along the radial direction of the rotating wheel, and a plurality of friction blocks are arranged at two ends of the rotating wheel; the friction block slides outwards to make the friction block in frictional contact with the lifting rod; the adjusting plates can be arranged in a sliding manner along the radial direction of the rotating wheel and are uniformly distributed along the circumferential direction of the rotating wheel, and the cable is wound on the adjusting plates; each clamping linkage assembly is connected with one end of one friction block and one end of one adjusting plate, and the linkage assemblies clamp the friction blocks in an initial state, so that when the rotating speed of the rotating wheel reaches a preset value, the friction blocks are separated from the clamping of the clamping linkage assemblies, and when the adjusting plates slide towards the axis of the rotating wheel, the clamping linkage assemblies enable the outward initial speed of the friction blocks to be increased.
2. A crane fall protection safety device as claimed in claim 1, wherein:
the clamping linkage assembly comprises a clamping piece and a linkage piece;
fixing discs are arranged at two ends of the rotating wheel, and a plurality of adjusting grooves are formed in each fixing disc; one end of the friction block can extend into the adjusting groove, and a clamping groove is formed in the peripheral wall of the friction block positioned in the adjusting groove; the clamping piece comprises a connecting rod, a force storage spring, two hinged rods, two clamping springs and two clamping blocks; the two clamping blocks are symmetrically arranged in the clamping grooves of the friction block; the connecting rod is arranged at the bottom of the adjusting groove; one end of the force storage spring is connected with the friction block, and the other end of the force storage spring is connected with the connecting rod; one end of the hinge rod is hinged with one end of the connecting rod, and the other end of the hinge rod is contacted with the upper wall of the adjusting groove so as to drive the other end of the hinge rod to slide towards the direction close to the friction block when the connecting rod moves towards the direction close to the friction block; one end of the clamping spring is connected with the other end of the hinge rod, and the other end of the clamping spring is connected with the clamping block; the linkage piece is used for driving the adjusting rod to slide towards the direction close to the friction block when the adjusting plate moves towards the direction close to the axis of the rotating wheel.
3. A crane fall protection safety device as claimed in claim 2, wherein:
the linkage piece comprises a transmission gear, a first rack and a second rack; the bottom of the adjusting groove extends to the axis along the radial direction of the fixed disc to form a transmission groove; the first rack is arranged in the transmission groove and is fixedly connected with the connecting rod; the transmission gear is rotatably arranged in the transmission groove and is meshed with the first rack; the second rack is slidably arranged in the transmission groove and meshed with the transmission gear; the second rack is connected with the adjusting plate.
4. A crane fall protection safety device as claimed in claim 2, wherein:
two rotary grooves are fixedly arranged on the lifting rod; the fixed wheels at the two ends of the rotating wheel are respectively and rotatably inserted in a rotating groove; the friction block may be in frictional contact with an inner wall of the rotation groove.
5. A crane fall protection safety device as claimed in claim 2, wherein: the device also comprises a braking mechanism;
the brake mechanism comprises a brake sleeve, a brake spring and a brake ring; the braking sleeve is rotatably sleeved on the rotating wheel; the adjusting plate is positioned on the outer side of the adjusting cylinder, and the adjusting plate and the brake sleeve synchronously rotate; the brake spring is rotatably sleeved on the rotating wheel in an axially sliding manner and is positioned between the brake sleeve and the rotating wheel; one end of the brake spring is connected with the brake sleeve, and the other end of the brake spring is connected with the rotating wheel; friction transmission is carried out between the brake spring and the brake sleeve in the initial state; the brake ring is used for driving the outer diameter of the brake spring to be reduced when the brake sleeve and the rotating wheel rotate relatively.
6. A crane fall protection safety device as claimed in claim 5, wherein:
the rotating wheel is provided with a spiral groove; the brake ring is sleeved on the rotating wheel and inserted in the spiral groove, so that when the brake ring rotates relative to the rotating wheel, the brake ring can slide along the axial direction of the brake wheel; the brake ring is connected with the brake spring to drive the brake spring to slide along the axial direction of the rotating wheel.
7. A crane fall protection safety device as claimed in claim 5, wherein:
the two ends of the brake spring are provided with convex blocks; the two ends of the brake sleeve are fixedly provided with brake plates; the brake plate is provided with a first clamping groove, and the projection can be inserted into the first clamping groove; the fixed disk is provided with a second clamping groove, and the convex block can be inserted into the second clamping groove, so that when one convex block is inserted into the first clamping groove, the other convex block is inserted into the second clamping groove.
8. A crane fall arrest safety device according to claim 7, wherein:
a plurality of synchronous grooves are arranged on the brake plate; the synchronous groove is a straight groove and is arranged along the radial direction of the fixed disc; both ends of the adjusting plate are provided with connecting rods; each two synchronous grooves are inserted in one synchronous groove; and a return spring is arranged in each synchronous groove, one end of each return spring is fixedly connected with the connecting rod, and the other end of each return spring is fixedly connected with one side of the synchronous groove close to the axle center of the brake plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211044546.8A CN115108487A (en) | 2022-08-30 | 2022-08-30 | Anti-falling safety device of crane |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211044546.8A CN115108487A (en) | 2022-08-30 | 2022-08-30 | Anti-falling safety device of crane |
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| Publication Number | Publication Date |
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| CN115108487A true CN115108487A (en) | 2022-09-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211044546.8A Pending CN115108487A (en) | 2022-08-30 | 2022-08-30 | Anti-falling safety device of crane |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117023389A (en) * | 2023-10-09 | 2023-11-10 | 阿尔法起重机有限公司 | Winch with intelligent shutdown protection function |
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| CN113682987A (en) * | 2021-09-09 | 2021-11-23 | 河南省建筑科学研究院有限公司 | Crane operation safety monitoring device |
| CN114180481A (en) * | 2022-02-17 | 2022-03-15 | 河南工学院 | Safety protection device of hoisting equipment and application of safety protection device in tree transplanting |
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|---|---|---|---|---|
| RU2026262C1 (en) * | 1992-05-07 | 1995-01-09 | Общество с ограниченной ответственностью "ИНЭКО" | Hand hoist |
| CN105480889A (en) * | 2015-12-23 | 2016-04-13 | 中联重科股份有限公司 | Coiling block stall braking system and hoisting device |
| US20190232093A1 (en) * | 2018-01-26 | 2019-08-01 | Bailout, LLC | Controlled Descent Safety Systems and Methods |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117023389A (en) * | 2023-10-09 | 2023-11-10 | 阿尔法起重机有限公司 | Winch with intelligent shutdown protection function |
| CN117023389B (en) * | 2023-10-09 | 2024-01-09 | 阿尔法起重机有限公司 | Winch with intelligent shutdown protection function |
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Application publication date: 20220927 |