CN111960310B - Braking device of mine hoist - Google Patents
Braking device of mine hoist Download PDFInfo
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- CN111960310B CN111960310B CN202010873596.1A CN202010873596A CN111960310B CN 111960310 B CN111960310 B CN 111960310B CN 202010873596 A CN202010873596 A CN 202010873596A CN 111960310 B CN111960310 B CN 111960310B
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- Prior art keywords
- braking
- bracket
- brake shoe
- moving
- guide rail
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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
- B66D5/12—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes with axial effect
- B66D5/14—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes with axial effect embodying discs
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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
- B66D5/24—Operating devices
- B66D5/26—Operating devices pneumatic or hydraulic
- B66D5/28—Operating devices pneumatic or hydraulic specially adapted for winding gear, e.g. in mining hoists
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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
- B66D5/12—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes with axial 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
- B66D5/24—Operating devices
- B66D5/30—Operating devices electrical
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Braking Arrangements (AREA)
Abstract
本公开属于矿井提升机领域，公开一种矿井提升机的制动装置，包括滚筒、支架和制动机构，所述滚筒安装于支架上，制动机构安装于支架上，所述支架上安装有托架，制动机构安装于托架上；所述制动机构包括传动单元、执行单元和驻车单元，传动单元与执行单元连接，驻车单元与执行单元连接。本公开通过控制力矩电机正转时动闸瓦与滚筒接触实现制动，力矩电机反转时动闸瓦远离滚筒制动解除，矿井提升机松闸，同时弱电控制制动装置，利用力矩电机提供制动力矩，无需复杂的液压系统，简化了盘式制动器结构同时避免了液压驱动导致泄露等一系列问题。
The present disclosure belongs to the field of mine hoists, and discloses a braking device for a mine hoist, comprising a drum, a bracket and a braking mechanism, wherein the drum is mounted on the bracket, the braking mechanism is mounted on the bracket, and the bracket is mounted with a a bracket, and a braking mechanism is mounted on the bracket; the braking mechanism includes a transmission unit, an execution unit and a parking unit, the transmission unit is connected with the execution unit, and the parking unit is connected with the execution unit. The present disclosure realizes braking by controlling the contact between the moving brake shoe and the drum when the torque motor rotates in the forward direction. When the torque motor rotates in reverse, the moving brake shoe moves away from the drum to release the brake, and the mine hoist releases the brake. The braking torque does not require a complex hydraulic system, which simplifies the structure of the disc brake and avoids a series of problems such as leakage caused by hydraulic drive.
Description
Technical Field
The disclosure belongs to the field of mine hoists, and particularly relates to a braking device of a mine hoist.
Background
At present, a plurality of large-scale mechanical brakes at home and abroad use a hydraulic system to realize the braking purpose, and the traditional hydraulic braking system realizes the control of the braking force by controlling the hydraulic valve. For large mechanical braking of existing cranes, mine hoists and the like, at present, braking is mainly completed through a hydraulic disc brake, and the hydraulic disc brake generates braking force by using a belleville spring and is released by oil pressure. When pressure oil is filled into the oil cylinder, the piston is pushed to compress the belleville spring, and the brake body and the brake shoe are driven to leave the brake disc, so that the brake is released;
when the pressure in the oil cylinder is reduced, the butterfly spring recovers the compression deformation, and pushes the brake body and the brake shoe by the spring force, so that the brake shoe is pressed to the brake disc to realize braking. For a long time, hydraulic control always faces to the tedious installation of a hydraulic oil pipe, and the unstable oil pressure caused by the leakage of hydraulic oil so as to influence the braking effect, and meanwhile, the leakage of the hydraulic oil also causes a series of problems of environmental pollution and the like, so that numerous scholars at home and abroad begin to research and design electromechanical braking devices and make certain progress. However, the application of electromechanical braking devices in the field of ultra-deep mine hoists has not been seen.
Disclosure of Invention
In view of the deficiencies of the prior art, it is an object of the present disclosure to provide a braking device for a mine hoist that solves the problems mentioned in the background art.
The purpose of the disclosure can be realized by the following technical scheme:
the braking device of the mine hoist comprises a roller, a support and a braking mechanism, wherein the roller is arranged on the support, the braking mechanism is arranged on the support, a bracket is arranged on the support, and the braking mechanism is arranged on the bracket.
The brake mechanism comprises a transmission unit, an execution unit and a parking unit, wherein the transmission unit is connected with the execution unit, and the parking unit is connected with the execution unit.
Furthermore, the transmission unit comprises a worm wheel, a worm, a movable screw rod, a nut and a ball, the worm wheel and the worm are meshed with each other, an inner ring of the worm wheel is coaxially arranged on an outer ring of the nut, and an inner ring of the nut is arranged in a matched mode with the movable screw rod through the ball.
Further, one end of the worm is provided with a mechanical brake release end.
Furthermore, a threaded hole is formed in one end of the movable screw rod, a movable block is installed in the threaded hole in a matched mode, and the movable block is connected with the execution unit.
Furthermore, the execution unit comprises a static brake shoe, a movable brake shoe, a circular guide rail, a connecting piece, a disc spring and a guide piece, wherein the static brake shoe is installed on one side of the support, the movable brake shoe is installed on the bracket, the movable brake shoe and the static brake shoe are distributed on two sides of the roller, the circular guide rail is connected with the movable brake shoe and the connecting piece, the connecting piece is connected with the movable block, the disc spring is installed on the guide piece, and the guide piece is connected with the movable brake shoe.
Furthermore, the turning mechanism comprises a trapezoidal screw rod, a clamping block, a linear guide rail and a guide rail support frame, wherein one end of the clamping block is installed on the trapezoidal screw rod, the other end of the clamping block is installed on the linear guide rail, and the linear guide rail is installed on the guide rail support frame.
Furthermore, the trapezoidal screw rod is divided into a left part and a right part, the thread turning directions of the left end screw rod and the right end screw rod of the trapezoidal screw rod are opposite, the left end screw rod is in threaded connection with the clamping block, and the right end screw rod is in threaded connection with the clamping block.
Further, the contact head is installed on the top of movable brake shoe, has seted up fluid storage chamber and spout on the contact head, and the quantity of spout is no less than three, and fluid storage chamber and spout intercommunication, the fluid storage intracavity fill have liquid, install the contact column cap in the spout, outside the spout was stretched out to the one end of contact column cap, the stopper was installed to the one end that the contact column cap is located the spout.
Furthermore, one end of the contact column head, which extends out of the sliding groove, is hinged with a lateral clamping block, the middle part of the lateral clamping block is hinged with a linkage rod, the upper surface of the contact head is provided with a moving groove, a moving slide block is slidably arranged in the moving groove, and the moving slide block is hinged with the linkage rod.
The beneficial effect of this disclosure:
the braking is realized by controlling the contact of the movable brake shoe and the roller when the torque motor rotates forwards, the movable brake shoe is far away from the roller when the torque motor rotates backwards to brake and release, the mine hoist is released, meanwhile, the brake device is controlled by weak current, the torque motor is used for providing braking torque, a complex hydraulic system is not needed, the structure of the disc brake is simplified, and a series of problems such as leakage caused by hydraulic driving are avoided.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a front view of the overall structure of an embodiment of the present disclosure;
FIG. 2 is a side view of the overall structure of an embodiment of the present disclosure;
FIG. 3 is a schematic view of a braking mechanism of an embodiment of the present disclosure;
FIG. 4 is a schematic structural diagram of a transmission unit of an embodiment of the present disclosure;
FIG. 5 is a schematic view of a worm gear configuration of an embodiment of the present disclosure;
FIG. 6 is a partial structural cross-sectional view of an embodiment of the present disclosure;
FIG. 7 is a schematic diagram of an execution unit structure according to an embodiment of the disclosure;
FIG. 8 is a schematic diagram of a partial structure of an execution unit according to an embodiment of the present disclosure;
FIG. 9 is a schematic structural diagram of a parking unit in accordance with an embodiment of the present disclosure;
FIG. 10 is a schematic view of a cradle of an embodiment of the present disclosure;
FIG. 11 is a schematic view of a case of an embodiment of the disclosure;
FIG. 12 is a schematic view of a case cover of an embodiment of the disclosure;
FIG. 13 is a schematic end cap view of an embodiment of the present disclosure;
FIG. 14 is a schematic view of a tapered roller bearing housing of an embodiment of the present disclosure;
FIG. 15 is a schematic view of a trapezoidal screw configuration in the parking unit of the disclosed embodiment;
FIG. 16 is a schematic view of a linkage configuration in an execution unit of an embodiment of the present disclosure;
FIG. 17 is a schematic diagram of a portion of the structure of an embodiment of the present disclosure;
fig. 18 is a schematic cross-sectional view of a portion of the structure of an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
As shown in fig. 1 to 18, the braking device of the mine hoist comprises a roller 1, a bracket 2 and a braking mechanism 3, wherein the roller 1 is arranged on the bracket 2, and the braking mechanism 3 is arranged on the bracket 2;
a bracket 5 is arranged on the bracket 2, the bracket 5 is fixedly connected with the bracket 2 through a stud, and the braking mechanism 3 is arranged on the bracket 5;
the bracket 5 is provided with a box body 10, the box body 10 is provided with a first threaded hole 1001 which is fixed on the bracket 5 through a screw, the braking mechanism 3 is arranged inside the box body 10, the box body 10 plays a role in protecting and supporting the whole braking mechanism 3,
the brake mechanism 3 comprises a transmission unit, an execution unit and a parking unit, wherein the transmission unit is connected with the execution unit and is used for providing braking force for the execution unit so that the execution unit moves towards the direction close to the roller 1; the execution unit is used for contacting, extruding and rubbing the roller 1 to brake the roller 1; the parking unit is connected with the execution unit, and the parking unit is used for keeping the braking effect of the execution unit and avoiding the phenomenon of slipping.
The transmission unit comprises a worm wheel 16, a worm 14, a movable screw rod 18, a nut 15 and a ball 23, the worm wheel 16 is meshed with the worm 14, the inner ring of the worm wheel 16 is coaxially arranged on the outer ring of the nut 15, and the inner ring of the nut 15 is arranged in a matched manner with the movable screw rod 18 through the ball 23;
when the device is installed, an axial included angle between the worm wheel 16 and the worm 14 is 90 degrees, so that the vertical reversing of the movement is realized, the number of heads of the worm 14 and the number of teeth of the worm wheel 16 can be set according to actual requirements, the size of a transmission ratio is changed, and the purpose of speed reduction is realized;
the two ends of the worm 14 are provided with angular contact bearings, the worm 14 and the angular contact bearings are in interference fit, in order to prevent the axial movement of the worm 14 and the angular contact bearings, the angular contact bearings are placed in the angular contact bearing seats 13, and meanwhile, the worm 14 is provided with the stepped shaft mounting small round nuts 21, so that the failure of braking caused by the axial movement of the worm 14 can be effectively avoided;
one end of the worm 14 is provided with a torque motor 12, an output shaft of the torque motor 12 is connected with the worm 14 by a first coupler 20, the speed and the torque of the torque motor 12 are controlled, the two control the braking response time and the braking torque of the braking mechanism 3 together, the actual use requirement is met, the torque motor 12 is used for providing braking force, a complex hydraulic system is not needed, and a series of problems of leakage and the like caused by hydraulic drive are avoided;
the other end of the worm 14 is provided with a mechanical trip end 22, which allows manual intervention in case of emergency, avoiding accidents.
A stepped shaft is arranged outside the nut 15 and fixedly connected with a worm wheel 16, the stepped shaft is arranged at two ends of the worm wheel 16 arranged on the nut 15, and large round nuts 17 are arranged at two sides of the worm wheel 16, so that the influence of the axial movement of the worm wheel 16 on the braking precision of the braking mechanism 3 can be prevented;
the two ends of the nut 15 are in interference fit with the tapered roller bearing 3401, the tapered roller bearing 3401 is used for limiting the back-and-forth movement of the nut 15, the tapered roller bearing 3401 at one end of the nut 15 is arranged in a tapered roller bearing seat 34 in the box body 10, an end cover 11 is arranged at the tail end of the tapered roller bearing seat 34, and the end cover 11 is connected with the box body 10 through screws, so that the situation that the moment motor 12 drives the movable screw rod 18 to move backwards for an overlarge distance when rotating reversely to cause brake failure is prevented;
the other end of the nut 15 is mounted in a bearing seat connecting port 1004 connected with the box body 10, the tapered roller bearing seat 34 is detachably mounted on one side of the box body 10, for example, fixed on the side surface of the box body 10 by bolts, and the two tapered roller bearings 3401 are both placed in the tapered roller bearing seat 34;
the tapered roller bearing blocks 34 are mounted on one side of the box body 10 and are connected together through the bearing block connecting ports 1004 by screws, and the outer ends of the tapered roller bearings 3401 are provided with washers 3402 for fixedly supporting the movable screw rods 18, thereby ensuring that the braking of the mine hoist can be realized.
One end of the movable screw rod 18 is provided with a threaded hole, a movable block 19 is arranged in the threaded hole in a matched mode, and the movable block 19 is connected with the execution unit.
When the torque motor 12 rotates, the worm 14 is driven to rotate, the worm 14 transmits motion to the worm wheel 16 so as to drive the nut 15 to rotate, the motion is transmitted to the movable screw rod 18 through the ball 23 inside the nut 15, the movable screw rod 18 realizes linear motion under the pushing action of the ball 23, the front and back linear motion of the movable screw rod 18 drives the movable block 19 to move, so that the execution unit is driven to linearly move, and the braking and the brake releasing of the braking mechanism 3 are realized.
The execution unit comprises a static brake shoe 4, a movable brake shoe 26, a circular guide rail 25, a coupling piece 7, a disc spring 24 and a guide piece 27, wherein the static brake shoe 4 is arranged on one side of the bracket 2, the movable brake shoe 26 is arranged on the bracket 5, the movable brake shoe 26 and the static brake shoe 4 are distributed on two sides of the roller 1, the circular guide rail 25 is connected with the movable brake shoe 26 and the coupling piece 7, the coupling piece 7 is connected with the movable block 19, the disc spring 24 is arranged on the guide piece 27, and the guide piece 27 is connected with the movable brake shoe 26;
the execution unit is connected with a moving block 19 of the transmission unit, the moving brake shoe 26 is driven by the transmission unit to move towards the roller 1, and the moving brake shoe 26 and the static brake shoe 4 jointly act to realize the braking purpose;
the coupling 7 is in the actuating unit responsible for connecting with the moving block 19 of the transmission unit, introducing the motion into the actuating unit;
a square hole 702 and a pin hole 703 are provided in the middle part of the coupling 7, the coupling 7 is connected to the moving block 19 by a pin, and the moving block 19 transmits motion to the actuator;
a dovetail guide rail 502 is arranged on the bracket 5, a dovetail groove 704 is arranged at the bottom of the connecting piece 7, and the connecting piece 7 and the bracket 5 are installed through the dovetail groove 704 and the dovetail guide rail 502, so that the linear motion of the movable screw rod 18 is ensured;
a bearing block 503 is arranged on the bracket 5, a plurality of threaded holes are formed for fixing a box body 10 and a torque motor 12 of the braking mechanism 3, and a reinforcing rib 501 is arranged at the bottom of the bracket 5 to improve the use performance of the bracket 5;
the connecting piece 7, the force bearing block 503 and the movable brake shoe 26 are respectively provided with four smooth round holes 701 with consistent hole centers, the round guide rail 25 penetrates through the connecting piece 7, the force bearing block 503 and the movable brake shoe 26, one end of the round guide rail 25 is provided with threads to be in threaded connection with the movable brake shoe 26, the other end of the round guide rail 25 is provided with threads to fix the round guide rail 25 on the connecting piece 7, the round guide rail 25 is used for connecting the movable brake shoe 26 and the connecting piece 7, and the connecting piece 7 and the movable brake shoe 26 are driven to move when the movable screw rod 18 moves linearly;
the tail end of the guide 27 is provided with a supporting surface with the diameter smaller than the major diameter of the disc spring 24, and the other end of the guide 27 is in threaded connection with the movable brake shoe 26;
the distance between the disc spring 24 and the bearing block 503 can be controlled by controlling the thread feeding distance between the guide member 27 and the movable brake shoe 26, so that the disc spring 24 is ensured to be in a slightly compressed state or to be kept in a state of collision with the bearing block 503 in a braking state, the disc spring 24 compresses the bearing block 503 in the brake releasing state, and the impact force of the braking mechanism in the braking process can be reduced by properly compressing the disc spring 24;
when the torque motor 12 rotates reversely, the movable screw rod 18 drives the disc spring 24 to be compressed on the bearing block 503, the disc spring 24 is in an energy absorption state, the brake mechanism 3 is released, in the brake releasing process, the movable brake shoe 26 is driven by the connecting piece 7 to leave the roller 1, the disc spring 24 is contacted with the bearing block 503 to compress the disc spring 24, the buffering is effectively reduced, and the service life of mechanical parts is prolonged;
when the torque motor 12 rotates positively, the disc spring 24 is far away from the bearing block 503, the disc spring 24 releases energy, and the braking mechanism 3 brakes; the disc spring 24 can effectively absorb and release energy, reduce impact force and prolong the service life of the machine.
The parking mechanism comprises a trapezoidal screw rod 30, a clamping block 31, a linear guide rail 32 and a guide rail support frame 33, wherein one end of the clamping block 31 is installed on the trapezoidal screw rod 30, the other end of the clamping block 31 is installed on the linear guide rail 32, and the linear guide rail 32 is installed on the guide rail support frame 33;
one end of the trapezoidal screw rod 30 is provided with a stepping motor 8, the stepping motor 8 is used as a power source, an output shaft of the stepping motor 8 is connected with the trapezoidal screw rod 30 through a second coupler 28,
the trapezoidal screw rod 30 is divided into a left part and a right part, the thread turning directions of a left end screw rod 3001 and a right end screw rod 3002 of the trapezoidal screw rod 30 are opposite, the left end screw rod 3001 is in threaded connection with the clamping block 31, and the right end screw rod 3002 is in threaded connection with the clamping block 31;
the lower ends of the two clamping blocks 31 are provided with round holes, the smooth linear guide rail 32 penetrates through the round holes, the linear guide rail 32 is used for limiting the displacement direction of the clamping blocks 31, two ends of the linear guide rail 32 are installed on the guide rail support frame 33, the linear guide rail 32 is fixed by using a set screw, and the linear guide rail 32 support frame is fixed with the box body 10 through screws, so that the clamping blocks 31 can normally move in work;
when the stepping motor 8 rotates, the trapezoidal screw rod 30 is driven to move, so that the two clamping blocks 31 move oppositely or reversely;
when the stepping motor 8 rotates forwards, the trapezoidal screw rod 30 is driven to rotate, so that the clamping block 31 clamps the worm 14, and parking is finished; when the stepping motor 8 rotates reversely, the trapezoidal screw rod 30 is driven to rotate, so that the two clamping blocks 31 move backwards to loosen the worm 14, and the parking is finished;
and starting the parking mechanism in the braking process, and driving the trapezoidal screw rod 30 to rotate by utilizing the rotation of the stepping motor 8, so that the clamping blocks 31 at two sides move oppositely along the linear guide rail 32 to clamp the worm 14, finally completing the braking of the mine hoist, and avoiding the phenomenon of car sliding caused by inertia.
Set up hole and step motor connection port 1005 on box 10, make things convenient for box 10 inner structure to be connected with outside torque motor 12 and step motor 8, be provided with case lid 9 on the box 10, guarantee that transmission structure can not advance the pollutant in the box 10, influence the braking precision.
The contact head 260 is installed at the top end of the movable brake shoe 26, a fluid storage cavity 265 and a sliding groove 266 are formed in the contact head 260, the number of the sliding grooves 266 is not less than three, the fluid storage cavity 265 is communicated with the sliding groove 266, a contact column head 262 is installed in the sliding groove 266, one end of the contact column head 262 extends out of the sliding groove 266, one end of the contact column head 262 extending out of the sliding groove 266 is provided with a rubber pad, the rubber pad can increase friction force of a contact surface, one end, located in the sliding groove 266, of the contact column head 262 is provided with a limiting block 267, the outer ring of the limiting block 267 is provided with a first sealing ring, the outer ring of the first sealing ring is tightly attached to the inner wall of the sliding groove 266, and the fluid storage cavity 265 is filled with liquid;
when the braking mechanism 3 starts braking, the movable brake shoe 26 drives the contact column head 262 to move towards the surface to be braked, the top end of the contact column head 262 is contacted with the surface to be braked, when the surface to be braked is uneven, the contact point of the contact column head 262 and the surface to be braked is not on a plane, the convex point of the surface to be braked presses the contact column head 262 to be retracted, the retracted contact column head 262 presses the liquid in the chute 266 in which the contact column head 262 is positioned to flow towards the fluid storage cavity 265, the concave point of the surface to be braked is not contacted with the contact column head 262, the front end of the contact column head 262 which is not contacted with the surface to be braked is not subjected to pressure, the liquid flows into the chute 266 in which the contact column head 262 which is not contacted with the surface to be braked until the pressure applied to all the contact column heads 262 and the surface to be braked are balanced, the liquid in the fluid storage cavity 265 can play a role of buffering, all the contact column heads 262 are maintained in a balanced state, so that the contact points of the surface to be braked and the contact column head 262 are uniformly applied and tightly pressed against the surface to be braked, thereby realizing that the contact head 260 is suitable for the uneven surface to be braked;
in practical application, when a component to be braked is a small machine, the contact stud 262 on the contact head 260 is not completely contacted with a surface to be braked, and the original contact stud 262 may not be capable of braking a small plane;
one end of the contact column head 262, which extends out of the sliding groove 266, is hinged with a lateral clamping block 263, the middle part of the lateral clamping block 263 is hinged with a linkage rod 264, the upper surface of the contact head 260 is provided with a moving groove 261, a moving slider is arranged in the moving groove 261 and moves linearly along the moving groove 261, and the moving slider is hinged with the linkage rod 264;
when the surface to be braked is a small plane, the surface to be braked is in contact with and pressed by the top end of a part of the contact column head 262, the contact column head 262 in contact with the surface to be braked moves towards the inside of the contact head 260 and presses liquid in the fluid storage cavity 265, so that the liquid flows towards the sliding groove 266 where the contact column head 262 which is not in contact with the surface to be braked is located, the contact column head 262 which is not in contact with the surface to be braked moves towards the outside of the contact head 260, the end, hinged with the contact column head 262, of the lateral clamping block 263 moves towards the direction away from the contact head 260, under the action of the movable sliding block and the linkage rod 264, the end, which is not connected with the contact column head 262, of the lateral clamping block 263 moves towards the direction close to the contact head 260, and the end, which is not connected with the contact column head 262, of the lateral clamping block 263 is in contact with and pressed tightly against the side surface of the machine to be braked, so that the end surface and the side surface of the machine to be braked are acted by braking force, the brake is firmer, so that the brake function on the small machine is realized;
when the surface to be braked is a large plane, the surface to be braked is in contact extrusion with the lateral clamping block 263, under the action of the connecting rod and the movable sliding block, one end of the lateral clamping block 263, which is not connected with the contact column head 262, moves towards the direction close to the contact head 260, and all the contact column heads 262 are in contact with the surface to be braked so as to realize the braking action.
The working principle is as follows:
controlling the torque motor 12 to rotate, driving the worm wheel 16 to rotate through the rotation of the worm 14, enabling the nut 15 to rotate and drive the movable screw rod 18 to do linear motion, transmitting the motion to the connecting piece 7 by the movable block 19, and driving the brake shoe 26, the disc spring 24 and the guide piece 27 to move towards the roller 1 by the linear motion of the connecting piece 7 along the dovetail groove 704 guide rail until the movable brake shoe 26 presses the roller 1;
starting the parking unit, providing a power source by the stepping motor 8, driving the trapezoidal screw rod 30 to rotate, enabling the clamping blocks 31 to move oppositely along the linear guide rail 32 to clamp the worm 14, preventing the phenomenon of vehicle sliding and completing the braking process;
when the brake mechanism 3 is released, the parking mechanism is started, so that the clamping block 31 moves back to loosen the worm 14 which is clamped originally, and then the torque motor 12 is controlled to rotate reversely to drive the brake shoe 26 to do linear motion far away from the roller 1, so that the brake mechanism 3 is released.
During the experiment, the programmable controller is connected with the torque motor 12, and a digital quantity signal and an analog quantity signal are sent to the torque motor 12 through the programmable controller;
the installation position of the brake mechanism 3 is 1mm-2mm away from the roller 1, the programmable controller and the torque motor 12 are connected with a 220V alternating current power supply, and a forward rotation instruction is sent to the torque motor 12 through the programmable controller, so that the torque motor 12 rotates forward to drive the movable brake shoe 26 to move to about 1.5mm away from the roller 1;
the programmable controller sends instructions to adjust the rotating speed and the torque of the torque motor 12 to realize the control of the braking force and the formulated response time of the braking device;
A24V power supply is connected through the stepping motor 8, an output shaft of the stepping motor 8 is connected with the trapezoidal screw rod 30 through a coupler, and a programmable controller sends an instruction to the stepping motor 8 to control the forward and reverse rotation of the stepping motor 8.
The control method has the advantages that the real-time regulation and control of the braking force and the braking response time of the braking mechanism 3 can be realized by utilizing the feedback signal of the torque motor 12 through the programmable controller, the whole electromechanical brake structure is suitable for the ultra-deep mine hoist, the installation and the disassembly are convenient, and a series of problems of hydraulic drive leakage and the like are avoided.
The experimental result analysis of the experimental test of the device of the present invention is further given below
The magnitude of the braking force is the most direct reaction to the braking effect of the braking mechanism 3, and the following test is carried out for obtaining the relation between the magnitude of the braking force, the current and the stroke of the braking tread under the condition of locked rotor, and the steps are as follows:
1) according to the braking requirement of the mine hoist, a torque motor 12 and a braking mechanism 3 are installed and fixed;
2) the execution unit in the braking mechanism 3 is installed and fixed, and the movable brake shoe 26 can move linearly along with the operation of the torque motor 12;
3) the transmission unit in the braking mechanism 3 is arranged at a preset position in the box body 10, so that the transmission unit can complete the transmission of motion;
4) the step motor 8 is arranged on the box body 10 of the braking mechanism 3, so that the parking unit can normally run when the torque motor 12 is locked, namely when the movable brake shoe 26 is contacted with the roller 1;
5) the power supply is switched on, a program is input into the programmable controller, and the operation of the torque motor 12 and the stepping motor 8 is controlled through an instruction sent by the programmable controller; the steering of the torque motor 12 is changed through a digital quantity signal sent by a programmable controller, and the output transmission force and the transmission speed of the torque motor 12 are changed through an analog quantity signal; the stepping motor 8 is controlled to rotate forwards and backwards through a pulse signal sent by a programmable controller to realize parking in the braking process;
6) the stroke of the trapezoidal screw rod 30 when the braking mechanism 3 is locked is changed, the torque motor 12 drives the braking device to work, the spoke type sensor and the weighing display output the braking force of the trapezoidal screw rod 30 in different stroke states when the braking device is locked, and the braking force of the braking mechanism 3 during braking and brake releasing is read as shown in table 1 under the condition that the stroke of the trapezoidal screw rod 30 is 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm and 0.75 mm;
7) the magnitude of the output analog quantity, namely the magnitude of the current, is changed through the programmable controller, the torque motor 12 is used for driving, the braking force of the braking mechanism 3 is observed under different currents of the braking mechanism 3, and two groups of experimental data are measured and shown in a table 2.
(1) Relationship between braking force and stroke of brake device
In the stroke range of the braking tread, the spoke type sensor and the movable brake shoe 26 are placed on the same horizontal plane, and are in a collision-free state, the size of the stroke of the trapezoidal screw rod 30 is set through Kollmorgen workbench software, so that the relation between the stroke and the braking force of the trapezoidal screw rod 30 during locked-rotor is observed, and 3 groups of tests are continuously carried out; the size of 30 strokes of trapezoidal lead screw is provided with 6: 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm and 0.75mm, driving the torque motor 12 to work, observing the data displayed by the weighing display, and analyzing to obtain the relation between the stroke of the braking tread and the locked-rotor torque. The braking forces of the three groups of braking mechanisms 3 measured at each determined stroke are changed as follows:
table 1 is a braking force versus stroke table:
it can be seen from the table information that when the braking mechanism 3 is locked, the stroke distance of the trapezoidal screw rod 30 is increased, and the braking force of the braking mechanism 3 is also increased, so that the closer the braking tread is in contact with an object to be braked, the larger the braking force is, the better the braking effect is, and therefore, the braking by pressing the roller 1 by the movable brake shoe 26 in the scheme of the invention is feasible.
(2) Relation between braking force and current of brake
The torque motor 12 changes the current of the torque motor 12 through an analog quantity signal input by a programmable controller in a torque mode, and then controls the braking force of the braking mechanism 3, so that the torque motor 12 is driven to operate to obtain the relation between the braking force and the current, and a plurality of groups of experimental data are measured as follows.
Table 2 is a braking force versus current table:
according to the experimental data, the braking force of the braking mechanism 3 is increased along with the increase of the current, so that the braking force of the braking mechanism 3 can be controlled by changing the analog quantity transmitted to the torque motor 12 by the programmable controller, and a series of problems caused by leakage of hydraulic oil in the traditional hydraulic braking mode are avoided.
In the description herein, references to the description of "one embodiment," "an example," "a specific example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the disclosure. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing illustrates and describes the general principles, principal features, and advantages of the present disclosure. It will be understood by those skilled in the art that the present disclosure is not limited to the embodiments described above, which are presented solely for purposes of illustrating the principles of the disclosure, and that various changes and modifications may be made to the disclosure without departing from the spirit and scope of the disclosure, which is intended to be covered by the claims.
Claims (8)
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| CN202010873596.1A CN111960310B (en) | 2020-08-26 | 2020-08-26 | Braking device of mine hoist |
| LU102066A LU102066B1 (en) | 2020-08-26 | 2020-09-18 | Braking Device of Mine Hoist |
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| CN112431872B (en) * | 2020-11-27 | 2022-09-23 | 深圳市飞铃智能系统集成有限公司 | Brake unit for locking constructional engineering mechanical component |
| CN114249263B (en) * | 2021-12-23 | 2023-07-21 | 安徽理工大学 | A method for improving the power of mine hoisting mechanism and emergency response |
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