CN111692242A - Power-off protection device for crane - Google Patents
Power-off protection device for crane Download PDFInfo
- Publication number
- CN111692242A CN111692242A CN202010403068.XA CN202010403068A CN111692242A CN 111692242 A CN111692242 A CN 111692242A CN 202010403068 A CN202010403068 A CN 202010403068A CN 111692242 A CN111692242 A CN 111692242A
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- China
- Prior art keywords
- clamping piece
- rod
- motor
- rotating shaft
- clamping
- 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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D49/00—Brakes with a braking member co-operating with the periphery of a drum, wheel-rim, or the like
- F16D49/16—Brakes with two brake-blocks
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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
- B66C23/90—Devices for indicating or limiting lifting moment
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
- F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
- F16D65/22—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for pressing members apart, e.g. for drum brakes
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
- H02K7/102—Structural association with clutches, brakes, gears, pulleys or mechanical starters with friction brakes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2121/00—Type of actuator operation force
- F16D2121/18—Electric or magnetic
- F16D2121/20—Electric or magnetic using electromagnets
- F16D2121/22—Electric or magnetic using electromagnets for releasing a normally applied brake
Abstract
The invention relates to a power-off protection device for a crane, which comprises a base, a motor, a speed reducing mechanism and a protection mechanism, wherein the speed reducing mechanism comprises a supporting component and a speed reducing component, the protection mechanism comprises a fixed rod, an electromagnet, a cross rod, a balancing weight, a hemp rope and a supporting rod, a connecting unit comprises an elastic pull rope and a connecting rod, the power-off protection device for the crane realizes the support of a first clamping piece and a second clamping piece through the supporting mechanism and enables the first clamping piece and the second clamping piece to better enable the brake piece to be attached to a rotating shaft of the motor, the rotating shaft of the motor is enabled to be in friction with the brake piece so as to stop the rotating shaft of the motor, the clamping force of the first clamping piece and the second clamping piece on the rotating shaft of the motor is mainly realized through the self weight of the balancing weight and the restoring force of a second spring, and the power-off protection for cranes of different models can be realized through adjusting the weight of the, the practicability of the use is increased.
Description
Technical Field
The invention particularly relates to a power-off protection device for a crane.
Background
The existing power-off protection device for the crane generally stops the gear from rotating through a hard object, so that certain damage can be caused to the gear, the gear cannot be meshed with other gears, the gear needs to be replaced again, the damage possibly caused by power-off is solved, and the gear needs to be replaced after the power-off protection device is used, so that the power-off protection device is relatively troublesome.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in order to overcome the defects of the prior art, the power-off protection device for the crane is provided.
The technical scheme adopted by the invention for solving the technical problems is as follows: a power-off protection device for a crane comprises a base, a motor, a speed reducing mechanism and a protection mechanism, wherein the base is horizontally arranged;
the speed reducing mechanism comprises a supporting assembly and a speed reducing assembly, the speed reducing assembly comprises a first clamping piece, a second clamping piece and brake blocks, the first clamping piece and the second clamping piece are respectively arranged on two sides of a motor rotating shaft, the first clamping piece and the second clamping piece are both arc-shaped, the circle centers of the first clamping piece and the second clamping piece are coincided with the axis of the motor rotating shaft, one end of the first clamping piece is hinged with one end of the second clamping piece, the other ends of the first clamping piece and the second clamping piece are respectively provided with a fixed block, the brake blocks are arc-shaped, the circle centers of the brake blocks are positioned on the axis of the motor rotating shaft, the number of the brake blocks is two, the two brake blocks are respectively arranged on two sides of the motor rotating shaft, the brake blocks are positioned between the rotating shaft and the first clamping piece, the brake blocks are fixedly connected with the first clamping piece, and a first spring is arranged between the two fixed blocks, two ends of the first spring are respectively connected with the two fixed blocks;
the support assemblies are arranged on one sides of the first clamping piece and the second clamping piece respectively, the two support assemblies are symmetrical about the rotating shaft, each support assembly comprises a piston cylinder, a second spring, a push rod and a bead screw, the piston cylinder is arranged on one side of the first clamping piece, the second spring is arranged in the piston cylinder, the push rod is arranged between the piston cylinder and the first clamping piece, one end of the push rod is hinged with the first clamping piece, the other end of the push rod extends into the piston cylinder and is hinged with the second spring, one end, far away from the push rod, of the second spring is connected with the piston cylinder, one end, far away from the push rod, of the piston cylinder is hinged with the base, the bead screw is arranged in the piston cylinder, the bead screws are two, the two bead screws are located on two sides of the push rod respectively, and the beads are fixedly connected with the piston cylinder, a clamping groove is formed in one end, located in the piston cylinder, of the push rod, and the wave ball screw is located in the clamping groove;
the protection mechanism comprises a fixed rod, an electromagnet, a cross rod, a balancing weight, a hemp rope and a support rod, wherein the fixed rod is arranged on the base, the cross rod and the support rod are both positioned between the fixed rod and the fixed block, the cross rod is arranged above the base, the support rod is arranged between the cross rod and the base, one end of the support rod is connected with the base, the other end of the support rod is hinged with the middle part of the cross rod, the balancing weight and the hemp rope are both arranged below one end, away from the fixed block, of the cross rod, the balancing weight is connected with the cross rod through the hemp rope, the electromagnet is arranged on one side of the top end of the fixed rod, and the electromagnet is abutted against one;
the connecting unit is arranged between the cross rod and the fixed blocks and comprises elastic pull ropes and two connecting rods, one ends of the two connecting rods are hinged, the other ends of the two connecting rods are hinged to the ends, far away from the first clamping piece, of the two fixed blocks respectively, and the end, far away from the fixed rod, of the cross rod is connected with the hinged position of the two connecting rods through the elastic pull ropes.
For better recovery, a torsional spring is arranged at the hinged position of the cross rod and the support rod.
For better make the friction disc support with the pivot of motor and lean on, the one end that the second holding piece is close to the fixed block is equipped with the arc-shaped elastic sheet, the one end that first holding piece is close to the fixed block be equipped with arc-shaped elastic sheet assorted spacing groove, the centre of a circle of arc-shaped elastic sheet is located the axis of the pivot of motor, the one end of arc-shaped elastic sheet is located the spacing inslot, the other end and the second holding piece of arc-shaped elastic sheet are articulated, be equipped with a plurality of archs on the first holding piece, the spacing inslot is equipped with a plurality of lugs, the cambered surface and each bellied cambered surface.
In order to prevent the arc-shaped elastic sheet from being removed and limiting the first clamping sheet and the second clamping sheet, the limiting device is characterized in that one end of the arc-shaped elastic sheet extending into the sliding groove is provided with a limiting block.
In order to increase the friction force, a rotating shaft of the motor is provided with a circular friction block, and the central axis of the friction block coincides with the axis of the rotating shaft of the motor.
In order to increase firmness, the friction block and the motor rotating shaft are integrally formed.
The power-off protection device for the crane has the advantages that the first clamping piece and the second clamping piece are supported through the supporting mechanism, the brake block can be better attached to the rotating shaft of the motor through the first clamping piece and the second clamping piece, the rotating shaft of the motor is made to be in friction with the brake block, the rotating shaft of the motor is made to stop, the clamping force of the first clamping piece and the second clamping piece on the rotating shaft of the motor is mainly achieved through the self weight of the balancing weight and the restoring force of the second spring, power-off protection can be achieved for cranes of different models through adjusting the weight of the balancing weight and the size of the friction block, and the practicability of use is improved.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic structural diagram of a power-off protection device for a crane according to the present invention;
FIG. 2 is a schematic structural diagram of the power-off protection device for the crane of the present invention;
FIG. 3 is an enlarged view of portion A of FIG. 2;
FIG. 4 is an enlarged view of portion B of FIG. 2;
FIG. 5 is a schematic structural diagram of the connection between the arc-shaped spring plate and the first clamping plate of the power-off protection device for a crane according to the present invention;
in the figure: 1. the brake comprises a base, 2. a motor, 3. a first clamping piece, 4. a second clamping piece, 5. a brake block, 6. a fixed block, 7. a first spring, 8. a piston cylinder, 9. a second spring, 10. a push rod, 11. a bead screw, 12. a fixed rod, 13. an electromagnet, 14. a cross rod, 15. a balancing weight, 16. a hemp rope, 17. a supporting rod, 18. an elastic pull rope, 19. a connecting rod, 20. an arc-shaped elastic sheet, 21. a limiting block, 22. a bulge and 23. a friction block.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
As shown in fig. 1-5, a power-off protection device for a crane comprises a base 1, a motor 2, a speed reduction mechanism and a protection mechanism, wherein the base 1 is horizontally arranged, the motor 2 and the protection mechanism are both arranged on the base 1, the speed reduction mechanism is arranged on a rotating shaft of the motor 2, and the protection mechanism is positioned on one side of the speed reduction mechanism;
the speed reducing mechanism comprises a supporting assembly and a speed reducing assembly, the speed reducing assembly comprises a first clamping piece 3, a second clamping piece 4 and brake blocks 5, the first clamping piece 3 and the second clamping piece 4 are respectively arranged at two sides of a rotating shaft of the motor 2, the first clamping piece 3 and the second clamping piece 4 are both arc-shaped, the circle centers of the first clamping piece 3 and the second clamping piece 4 are coincided with the axis of the rotating shaft of the motor 2, one end of the first clamping piece 3 is hinged with one end of the second clamping piece 4, the other ends of the first clamping piece 3 and the second clamping piece 4 are respectively provided with a fixing block 6, the brake blocks 5 are arc-shaped, the circle center of the brake block 5 is positioned on the axis of the rotating shaft of the motor 2, the brake blocks 5 are provided with two numbers, the two brake blocks 5 are respectively arranged at two sides of the rotating shaft of the motor 2, the brake blocks 5 are positioned between the rotating shaft and the first clamping piece 3, the brake pad 5 is fixedly connected with the first clamping pad 3, a first spring 7 is arranged between the two fixing blocks 6, and two ends of the first spring 7 are respectively connected with the two fixing blocks 6;
the support assemblies are arranged on one sides of the first clamping piece 3 and the second clamping piece 4 respectively, the two support assemblies are symmetrical about a rotating shaft, each support assembly comprises a piston cylinder 8, a second spring 9, a push rod 10 and a bead screw 11, the piston cylinder 8 is arranged on one side of the first clamping piece 3, the second spring 9 is arranged in the piston cylinder 8, the push rod 10 is arranged between the piston cylinder 8 and the first clamping piece 3, one end of the push rod 10 is hinged with the first clamping piece 3, the other end of the push rod 10 extends into the piston cylinder 8 and is hinged with the second spring 9, one end, far away from the push rod 10, of the second spring 9 is connected with the piston cylinder 8, one end, far away from the push rod 10, of the piston cylinder 8 is hinged with the base 1, the bead screw 11 is arranged in the piston cylinder 8, the bead screws 11 are two, and the two bead screws 11 are respectively positioned on two sides of the push rod 10, the wave ball screw is fixedly connected with the piston cylinder 8 through 11, a clamping groove is formed in one end, located in the piston cylinder 8, of the push rod 10, and the wave ball screw 11 is located in the clamping groove;
the protection mechanism comprises a fixed rod 12, an electromagnet 13, a cross rod 14, a balancing weight 15, a hemp rope 16 and a support rod 17, wherein the fixed rod 12 is arranged on the base 1, the cross rod 14 and the support rod 17 are both positioned between the fixed rod 12 and the fixed block 6, the cross rod 14 is arranged above the base 1, the support rod 17 is arranged between the cross rod 14 and the base 1, one end of the support rod 17 is connected with the base 1, the other end of the support rod 17 is hinged with the middle part of the cross rod 14, the balancing weight 15 and the hemp rope 16 are both arranged below one end of the cross rod 14 far away from the fixed block 6, the balancing weight 15 is connected with the cross rod 14 through the hemp rope 16, the electromagnet 13 is arranged on one side of the top end of the fixed rod 12, and the electromagnet 13 is abutted against one end of;
a connecting unit is arranged between the cross rod 14 and the fixed blocks 6 and comprises two elastic pull ropes 18 and two connecting rods 19, one ends of the two connecting rods 19 are hinged, the other ends of the two connecting rods 19 are hinged with the ends, far away from the first clamping pieces 3, of the two fixed blocks 6 respectively, and the end, far away from the fixed rod 12, of the cross rod 14 is connected with the hinged position of the two connecting rods 19 through the elastic pull ropes 18.
For better recovery, a torsion spring is arranged at the hinged part of the cross rod 14 and the support rod 17.
For better make friction disc 23 support with the pivot of motor 2 and lean on, the one end that second holding piece 4 is close to fixed block 6 is equipped with arc-shaped elastic sheet 20, the one end that first holding piece 3 is close to fixed block 6 is equipped with arc-shaped elastic sheet 20 assorted spacing groove, the centre of a circle of arc-shaped elastic sheet 20 is located the axis of motor 2's pivot, the one end of arc-shaped elastic sheet 20 is located the spacing inslot, the other end of arc-shaped elastic sheet 20 is articulated with second holding piece 4, be equipped with a plurality of archs on the first holding piece 3, the spacing inslot is equipped with a plurality of lugs, the cambered surface of lug supports with the cambered surface of each arch 22 and supports.
In order to prevent the arc-shaped elastic sheet 20 from moving out and limit the first clamping sheet 3 and the second clamping sheet 4, a limiting block 21 is arranged at one end of the arc-shaped elastic sheet 20 extending into the sliding groove.
In order to increase the friction force, the friction device is characterized in that a circular friction block 23 is arranged on the rotating shaft of the motor 2, and the central axis of the friction block 23 coincides with the axis of the rotating shaft of the motor 2.
In order to increase the firmness, the friction block 23 is integrally formed with the rotating shaft of the motor 2.
Both the electromagnet 13 and the motor 2 are here connected to a power supply.
The power-off protection device for the crane is used for controlling the drive shaft of the paying-off of the crane.
When the crane is suddenly powered off, the motor 2 stops rotating, but the object in mid-air will rapidly descend through self-weight, so that the rotating shaft of the motor 2 rotates, at this time, the electromagnet 13 is powered off due to power failure, the cross rod 14 is separated from the electromagnet 13, so that one end of the cross rod 14, which is far away from the fixing rod 12, is tilted through a torsion spring arranged at the hinged position of the cross rod 13 and the supporting rod 17 and the gravity of the counterweight block 15, the cross rod 14 drives the elastic pull rope 18 to move, the elastic pull rope 18 drives the connecting rod 19 to move, the connecting rod 19 drives the fixing block 6 to move, here, the first spring 7 is in a stretching state, the first clamping piece 3 and the second clamping piece 4 can be abutted against the friction block 23 more rapidly through the restoring force of the first spring 7, at this time, the pushing rod 10 moves due to the forced movement of the first clamping piece 3 and the, thereby make catch bar 10 and ripples pearl screw 11 thrust, at this moment make catch bar 10 promote first holding piece 3 and the removal of second holding piece 4 through the restoring force of second spring 9, make brake block 5 and the outer lane of clutch blocks 23 support and lean on in first holding piece 3 and the second holding piece 4, make the pivot of motor 2 pass through the friction of brake block 5 and clutch blocks 23 and stall, arc-shaped elastic piece 20 will pass through the restoring force of first spring 7 simultaneously, the gravity of balancing weight 15, the restoring force of second spring 9, the restoring force of horizontal pole 14 and the articulated department torsional spring of branch 17 and the restoring force of elasticity stay cord 18, make arc-shaped elastic piece 20 fast migration to bottom, make arch 22 and the lug on the arc-shaped elastic piece 20 support and lean on, thereby make the fixed of first holding piece 3 and second holding piece 4, thereby give people a buffering time, avoid the emergence of accident.
Here, the friction block 23 arranged on the rotating shaft of the motor 2 increases the contact area of the rotating shaft, thereby increasing the friction force and stopping the rotation of the motor 2 more quickly.
Here, by providing the limiting mechanism between the first holding piece 3 and the second holding piece 4, since the restoring force of the first spring 7, the weight of the weight block 15, the restoring force of the second spring 9, the restoring force of the torsion spring at the hinge of the cross bar 14 and the support bar 17, and the restoring force of the elastic pulling rope 18 are instantaneously restored, the force at this time is larger than the weight of the weight block 15 and the restoring force of the second spring 9, and then the first holding piece 3 and the second holding piece 4 are pushed by the weight of the weight block 15 and the restoring force of the second spring 9.
When the return is needed, only by pulling the two fixing blocks 6, the first clamping piece 3 and the second clamping piece 4 are separated, the push rod 10 abuts against the wave bead screw 11 in the piston cylinder 8, and the second spring 9 is in a compressed force storage state.
The power-off protection of cranes of different models can be realized by adjusting the weight of the balancing weight 15 and the size of the friction block 23.
Compared with the prior art, this a power-off protection device for hoist passes through supporting mechanism and realizes the support to first holding piece 3 and second holding piece 4 and make the pivot laminating of brake block 5 and motor 2 that first holding piece 3 and second holding piece 4 can be better, make the pivot of motor 2 through rubbing with brake block 5, make the pivot of motor 2 stop, here first holding piece 3 and second holding piece 4 are to the clamping-force of motor 2 pivot, mainly realize through the dead weight of balancing weight 15 and the restoring force of second spring 9, here can realize the hoist realization power-off protection to different models through the weight of adjusting balancing weight 15 and the size of clutch blocks 23, the practicality of use has been increased.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (6)
1. The power-off protection device for the crane is characterized by comprising a base (1), a motor (2), a speed reducing mechanism and a protection mechanism, wherein the base (1) is horizontally arranged, the motor (2) and the protection mechanism are both arranged on the base (1), the speed reducing mechanism is arranged on a rotating shaft of the motor (2), and the protection mechanism is positioned on one side of the speed reducing mechanism;
the speed reducing mechanism comprises a supporting assembly and a speed reducing assembly, the speed reducing assembly comprises a first clamping piece (3), a second clamping piece (4) and a brake block (5), the first clamping piece (3) and the second clamping piece (4) are respectively arranged on two sides of a rotating shaft of a motor (2), the first clamping piece (3) and the second clamping piece (4) are both arc-shaped, the circle centers of the first clamping piece (3) and the second clamping piece (4) are coincident with the axis of the rotating shaft of the motor (2), one end of the first clamping piece (3) is hinged with one end of the second clamping piece (4), the other ends of the first clamping piece (3) and the second clamping piece (4) are respectively provided with a fixing block (6), the brake block (5) is arc-shaped, the circle center of the brake block (5) is positioned on the axis of the rotating shaft of the motor (2), and the brake blocks (5) are two, the two brake pads (5) are respectively arranged on two sides of a rotating shaft of the motor (2), the brake pads (5) are positioned between the rotating shaft and the first clamping piece (3), the brake pads (5) are fixedly connected with the first clamping piece (3), a first spring (7) is arranged between the two fixing blocks (6), and two ends of the first spring (7) are respectively connected with the two fixing blocks (6);
the support assemblies are arranged on one sides of the first clamping piece (3) and the second clamping piece (4) respectively, the two support assemblies are symmetrical about a rotating shaft, each support assembly comprises a piston cylinder (8), a second spring (9), a push rod (10) and a bead screw (11), the piston cylinder (8) is arranged on one side of the first clamping piece (3), the second spring (9) is arranged in the piston cylinder (8), the push rod (10) is arranged between the piston cylinder (8) and the first clamping piece (3), one end of the push rod (10) is hinged to the first clamping piece (3), the other end of the push rod (10) extends into the piston cylinder (8) and is hinged to the second spring (9), one end, far away from the push rod (10), of the second spring (9) is connected with the piston cylinder (8), one end, far away from the push rod (10), of the piston cylinder (8) is hinged to the base (1), the wave bead screw (11) is arranged in the piston cylinder (8), the number of the wave bead screws (11) is two, the two wave bead screws (11) are respectively positioned on two sides of the push rod (10), the wave bead screws are fixedly connected with the piston cylinder (8) (11), a clamping groove is formed in one end, positioned in the piston cylinder (8), of the push rod (10), and the wave bead screws (11) are positioned in the clamping groove;
the protection mechanism comprises a fixed rod (12), an electromagnet (13), a cross rod (14), a balancing weight (15), a hemp rope (16) and a support rod (17), wherein the fixed rod (12) is arranged on a base (1), the cross rod (14) and the support rod (17) are both positioned between the fixed rod (12) and the fixed block (6), the cross rod (14) is arranged above the base (1), the support rod (17) is arranged between the cross rod (14) and the base (1), one end of the support rod (17) is connected with the base (1), the other end of the support rod (17) is hinged with the middle of the cross rod (14), the balancing weight (15) and the hemp rope (16) are both arranged below one end of the cross rod (14) far away from the fixed block (6), the balancing weight (15) is connected with the cross rod (14) through the hemp rope (16), the electromagnet (13) is arranged on one side of the top end of the fixed rod (12), the electromagnet (13) is abutted against one end, far away from the first clamping piece (3), of the fixing block (6);
be equipped with the linkage unit between horizontal pole (14) and fixed block (6), the linkage unit includes elasticity stay cord (18) and connecting rod (19), connecting rod (19) have two, and the one end of two connecting rods (19) is articulated, and the other end of two connecting rods (19) is articulated with the one end that first centre gripping piece (3) was kept away from in two fixed blocks (6) respectively, the articulated department of elasticity stay cord (18) and two connecting rods (19) is passed through to the one end that dead lever (12) were kept away from in horizontal pole (14).
2. The power-off protection device for crane according to claim 1, wherein the hinge joint of the cross bar (14) and the support bar (17) is provided with a torsion spring.
3. The power-off protection device for the crane according to claim 1, wherein an arc-shaped elastic sheet (20) is arranged at one end of the second clamping sheet (4) close to the fixing block (6), a limiting groove matched with the arc-shaped elastic sheet (20) is arranged at one end of the first clamping sheet (3) close to the fixing block (6), the circle center of the arc-shaped elastic sheet (20) is located on the axis of the rotating shaft of the motor (2), one end of the arc-shaped elastic sheet (20) is located in the limiting groove, the other end of the arc-shaped elastic sheet (20) is hinged to the second clamping sheet (4), a plurality of protrusions are arranged on the first clamping sheet (3), a plurality of convex blocks are arranged in the limiting groove, and the arc surfaces of the convex blocks are abutted to the arc surfaces of the convex blocks (22).
4. The power-off protection device for the crane according to claim 3, wherein a limit block (21) is arranged at one end of the arc-shaped elastic sheet (20) extending into the chute.
5. The power-off protection device for the crane according to claim 1, wherein a circular friction block (23) is arranged on the rotating shaft of the motor (2), and the central axis of the friction block (23) is coincident with the axis of the rotating shaft of the motor (2).
6. Power-off protection device for cranes according to claim 5, characterized in that the friction block (23) is formed integrally with the shaft of the motor (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010403068.XA CN111692242A (en) | 2020-05-13 | 2020-05-13 | Power-off protection device for crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010403068.XA CN111692242A (en) | 2020-05-13 | 2020-05-13 | Power-off protection device for crane |
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| CN111692242A true CN111692242A (en) | 2020-09-22 |
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| CN202010403068.XA Withdrawn CN111692242A (en) | 2020-05-13 | 2020-05-13 | Power-off protection device for crane |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112234879A (en) * | 2020-10-28 | 2021-01-15 | 浙江佳乐科仪股份有限公司 | Emergency stop device of permanent magnet synchronous motor |
| CN113257623A (en) * | 2021-05-12 | 2021-08-13 | 周玉云 | Intelligent device power-on protection equipment |
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