LU102066B1

LU102066B1 - Braking Device of Mine Hoist

Info

Publication number: LU102066B1
Application number: LU102066A
Authority: LU
Inventors: Fujie Wang; Chuanli Wang; Huanan Li; Huanyu Huo; Huawei Jin
Original assignee: Univ Anhui Sci & Technology
Priority date: 2020-08-26
Filing date: 2020-09-18
Publication date: 2021-12-20
Also published as: CN111960310B; CN111960310A

Abstract

The disclosure belongs to the field of mine hoists, and discloses a braking device of a mine hoist, including a roller, a support frame and a braking mechanism. The roller is installed on the support frame. The braking mechanism is installed on the support frame. A bracket is installed on the support frame. The braking mechanism is installed 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. The parking unit is connected with the execution unit. The disclosure realizes braking by controlling a movable brake shoe and the roller to be in contact when a moment motor positively rotates. When the moment motor reversely rotates, the movable brake shoe leaves away from the roller, so that the braking is relieved. The mine hoist performs brake releasing. At the same time, the braking device is controlled by a weak current. A braking moment is provided by using the moment motor. A complex hydraulic system is not needed. A structure of a disc brake is simplified. At the same time, a series of problems of leakage and the like caused by hydraulic driving are avoided.

Description

P100560LU00 1 LU102066

BRAKING DEVICE OF MINE HOIST

BACKGROUND Technical Field The disclosure belongs to the field of mine hoists, and more particularly relates to a braking device of a mine hoist. Related Art At present, braking of large-scale machinery around the world is generally realized by using a hydraulic system, and a traditional hydraulic braking system realizes the control on the magnitude of braking force by controlling a hydraulic valve. For example, braking of existing large-scale machinery, such as a crane and a mine hoist, is mainly completed through a hydraulic disc brake at present. The hydraulic disc brake uses a belleville spring to generate braking force, and realizes brake releasing through an oil pressure. After pressure oil is filled into an oil cylinder, a piston is pushed to compress the belleville spring, and drive a braking device body and a brake shoe to leave away from a braking disc, showing a brake releasing state.

After a pressure inside the oil cylinder decreases, the belleville spring recovers its compression deformation. The braking device body and the brake shoe are pushed by spring force, so that the brake shoe is pressed toward the braking disc to realize the braking. For a long time, hydraulic control faces a series of problems that the installation of a hydraulic oil pipe is complicated, the oil pressure is instable due to hydraulic oil leakage, so that the braking effect is influenced, at the same time, the environment is also polluted due to hydraulic oil leakage, and the like. Therefore, many scholars around the world have begun to study and design electro-mechanical braking devices, and have made some progress. However, it has not been seen that the electro-mechanical braking devices are applied to the field of ultra-deep mine hoists.

SUMMARY By aiming at defects in the prior art, an objective of the disclosure is to provide a braking device of a mine hoist, solving the problems mentioned in the related art.

The objective of the disclosure may be realized through the following technical solution: A braking device of a mine hoist includes a roller, a support frame and a braking mechanism. The roller is installed on the support frame. The braking mechanism is

P100560LU00 2 LU102066 installed on the support frame. À bracket is installed on the support frame. The braking mechanism is installed 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. The parking unit is connected with the execution unit.

Further, the transmission unit includes a worm gear, a worm, a moving lead screw, a screw nut and rolling balls. The worm gear and the worm are engaged with each other. An inner ring of the worm gear is coaxially installed at an outer ring of the screw nut. An inner ring of the screw nut is cooperatively installed with the moving lead screw through the rolling balls.

Further, one end of the worm is provided with a mechanical brake releasing end.

Further, a threaded hole is formed in one end of the moving lead screw. A moving block is installed in the threaded hole in a threaded fit way. The moving block is connected with the execution unit.

Further, the execution unit includes a static brake shoe, a movable brake shoe, a round guide rail, a connecting member, a belleville spring and a guide member. The static brake shoe is installed on one side of the support frame. 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 round guide rail and the movable brake shoe are connected with the connecting member. T he connecting member is connected with the moving block. The belleville spring is installed on the guide member. The guide member is connected with the movable brake shoe.

Further, the parking mechanism includes a trapezoidal lead screw, clamp blocks, a linear guide rail and a guide rail support frame. One end of the clamp block is installed on the trapezoidal lead screw. The other end of the clamp block is installed on the linear guide rail. The linear guide rail is installed on the guide rail support frame.

Further, the trapezoidal lead screw is divided into a left portion and a right portion. A left end lead screw and a right end lead screw of the trapezoidal lead screw have opposite screwing directions of screw threads. The left end lead screw is in threaded connection with the clamp block. The right end lead screw is in threaded connection with the clamp block.

Further, a contact head is installed at a top end of the movable brake shoe. A fluid

P100560LU00 3 LU102066 storage cavity and at least three slide grooves are formed in the contact head. The fluid storage cavity communicates with the slide grooves. The fluid storage cavity is filled with liquid. À contact post head is installed in the slide groove. One end of the contact post head extends out of the slide groove. A position limiting block is installed at one end of the contact post head positioned in the slide groove.

Further, a lateral clamping block is installed at one end of the contact post head extending out of the slide groove in a hinged way. A linkage rod is installed at a middle portion of the lateral clamping block in a hinged way. A moving groove is formed in an upper surface of the contact head. A moving slide block is glidingly installed in the moving groove. The moving slide block is hinged to the linkage rod.

The disclosure has the following beneficial effects: The disclosure realizes braking by controlling the movable brake shoe and the roller to be in contact when a moment motor positively rotates. When the moment motor reversely rotates, the movable brake shoe leaves away from the roller, so that the braking isrelieved. The mine hoist performs brake releasing. At the same time, the braking device is controlled by weak current. A braking moment is provided by using the moment motor. A complicated hydraulic system is not needed. A structure of a disc brake is simplified. At the same time, a series of problems of leakage and the like caused by hydraulic driving are avoided.

BRIEF DESCRIPTION OF THE DRAWINGS To describe the technical solutions in the detailed description of embodiments of the disclosure or in the prior art more clearly, the following briefly describes the accompanying drawings required for describing the detailed description of embodiments or the prior art. Apparently, a person of ordinary skill in the art may still derive other drawings from these accompanying drawings without creative efforts.

Figure 1 is a front view of an integral structure of an embodiment of the disclosure.

Figure 2 is a lateral view of the integral structure of the embodiment of the disclosure.

Figure 3 is a schematic structure diagram of a braking mechanism of the embodiment of the disclosure.

Figure 4 is a schematic structure diagram of a transmission unit of the embodiment of the disclosure.

P100560LU00 4 LU102066 Figure 5 is a schematic structure diagram of a worm gear and a worm of the embodiment of the disclosure. Figure 6 is a sectional view of a partial structure of the embodiment of the disclosure. Figure 7 is a schematic structure diagram of an execution unit of the embodiment of the disclosure. Figure 8 is a schematic diagram of a partial structure of the execution unit of the embodiment of the disclosure. Figure 9 is a schematic structure diagram of a parking unit of the embodiment of the disclosure. Figure 10 is a schematic diagram of a bracket of the embodiment of the disclosure. Figure 11 is a schematic diagram of a box body of the embodiment of the disclosure. Figure 12 is a schematic diagram of a box body cover of the embodiment of the disclosure. Figure 13 is a schematic diagram of an end cover of the embodiment of the disclosure. Figure 14 is a schematic diagram of a tapered roller bearing seat of the embodiment of the disclosure. Figure 15 is a schematic structure diagram of a trapezoidal lead screw in the parking unit of the embodiment of the disclosure. Figure 16 is a schematic structure diagram of a connecting member in the execution unit of the embodiment of the disclosure. Figure 17 is a schematic diagram of a partial structure of the embodiment of the disclosure. Figure 18 is a schematic sectional view of a partial structure of the embodiment of the disclosure.

DETAILED DESCRIPTION The technical solutions of the embodiments of the disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the disclosure. Apparently, the described embodiments are merely some rather than all of the embodiments of the disclosure. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the disclosure without creative efforts shall fall within the protection scope of the disclosure.

P100560LU00 LU102066 As shown in Figure 1 to Figure 18, a braking device of a mine hoist includes a roller 1, a support frame 2 and a braking mechanism 3. The roller 1 is installed on the support frame 2. The braking mechanism 3 is installed on the support frame 2.

A bracket 5 is installed on the support frame 2. The bracket 5 is fixedly connected 5 with the support frame 2 through double-end studs. The braking mechanism 3 is installed on the bracket 5.

A box body 10 is arranged and installed on the bracket 5. The box body 10 is provided with first threaded holes 1001 to be fixed onto the bracket 5 through screws. The braking mechanism 3 is installed inside the box body 10. The box body 10 achieves protection and support effects in the whole braking mechanism 3.

The braking mechanism 3 includes a transmission unit, an execution unit and a parking unit. The transmission unit is connected with the execution unit. The transmission unit is configured to provide braking force for the execution unit, so that the execution unit moves in a direction of approaching the roller 1. The execution unit is configured to be in contact extrusion and friction with the roller 1 to realize braking on the roller 1. The parking unit is connected with the execution unit. The parking unit is configured to maintain a braking effect of the execution unit so as to avoid a slipping and car slipping phenomenon.

The transmission unit includes a worm gear 16, a worm 14, a moving lead screw 18, ascrew nut 15 and rolling balls 23. The worm gear 16 and the worm 14 are engaged with each other. An inner ring of the worm gear 16 is coaxially installed at an outer ring of the screw nut 15. An inner ring of the screw nut 15 is cooperatively installed with the moving lead screw 18 through the rolling balls 23.

During installation, an included angle of axial lines between the worm gear 16 and the worm 14 should be 90 degrees, so as to realize the vertical direction change of the movement. The head number of the worm 14 and the tooth number of the worm gear 16 may be set according to practical requirements, so as to change the value of a transmission ratio, thus achieving an objective of deceleration.

Angular contact bearings are arranged at the two ends of the worm 14. 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 an angular contact bearing seat 13. At the same time, a step shaft is arranged

P100560LU00 6 LU102066 on the worm 14 and a small round screw nut 21 is installed, so that braking failure caused by the axial movement of the worm 14 can be effectively avoided. A moment motor 12 is installed at one end of the worm 14. An output shaft of the moment motor 12 is connected with the worm 14 through a first shaft coupler 20. The magnitudes of the speed and the moment of the moment motor 12 are controlled. Both of them jointly realize the control on the braking response time and the braking moment of the braking mechanism 3. A practical use requirement is achieved. The braking force is provided by using the moment motor 12. A complex hydraulic system is not needed. A series of problems of leakage and the like caused by hydraulic driving are avoided.

The other end of the worm 14 is provided with a mechanical brake releasing end 22. In emergency, manual intervention can be performed to avoid the occurrence of accidents.

The outside of the screw nut 15 is provided with a step shaft to be fixedly connected with the worm gear 16. The two ends of the worm gear 16 installed on the screw nut 15 are provided with step shafts. Big round screw nuts 17 are installed on two sides of the worm gear 16. The influence on the braking precision of the braking mechanism 3 caused by the occurrence of the axial movement of the worm gear 16 can be prevented.

The two ends of the screw nut 15 are both in interference fit with tapered roller bearings 3401. The tapered roller bearings 3401 are configured to limit the forward and backward movement of the screw nut 15. The tapered roller bearing 3401 at one end of the screw nut 15 is installed in a tapered roller bearing seat 34 in the box body 10, and an end cover 11 is arranged at the tail end of the tapered roller bearing seat 34. The end cover 11 is connected with the box body 10 through screws. The braking failure caused by an excessive backward movement distance of the moving lead screw 18 driven when the moment motor 12 reversely rotates is prevented.

The other end of the screw nut 15 is installed in a bearing seat connecting port 1004 connected with the box body 10. The tapered roller bearing seat 34 is detachably installed on one side of the box body 10, for example, fixed to a side surface of the box body 10 through screw bolts. The two tapered roller bearings 3401 are both placed in the tapered roller bearing seat 34.

The tapered roller bearing seat 34 is installed on one side of the box body 10, and is connected by the bearing seat connecting port 1004 through screws. Additionally, a

P100560LU00 7 LU102066 gasket 3402 is arranged at the outer end of the tapered roller bearing 3401, and is configured to fix and support the moving lead screw 18, so as to ensure that the braking of the mine hoist can be realized.

A threaded hole is formed in one end of the moving lead screw 18. A moving block 19 is installed in the threaded hole in a threaded fit way. The moving block 19 is connected with the execution unit.

When the moment motor 12 rotates, the worm 14 is driven to rotate. The worm 14 transmits the movement to the worm gear 16 so as to drive the screw nut 15 to rotate. Inside the screw nut 15, the movement is transmitted to the moving lead screw 18 through the rolling balls 23. The moving lead screw 18 realizes linear movement under the pushing effect of the rolling balls 23. The moving block 19 is driven to move by the forward and backward linear movement of the moving lead screw 18, so that the execution unit is driven to do linear movement, thus realizing the braking and brake releasing of the braking mechanism 3.

The execution unit includes a static brake shoe 4, a movable brake shoe 26, a round guide rail 25, a connecting member 7, a belleville spring 24 and a guide member 27. The static brake shoe 4 is installed on one side of the support frame 2. The movable brake shoe 26 is installed 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 round guide rail 25 and the movable brake shoe 26 are connected with the connecting member 7. The connecting member 7 is connected with the moving block 19. The belleville spring 24 is installed on the guide member 27. The guide member 27 is connected with the movable brake shoe 26.

The execution unit is connected with the moving block 19 of the transmission unit. The movable brake shoe 26 is driven by the transmission unit to move in a direction of the roller 1, and the movable brake shoe 26 and the static brake shoe 4 jointly act to achieve the objective of braking, The connecting member 7 is in charge of connection with the moving block 19 of the transmission unit in the execution unit, so as to introduce the movement into the execution unit.

A square hole 702 and a pin hole 703 are formed in a middle portion of the connecting member 7. The connecting member 7 and the moving block 19 are connected through a pin. The moving block 19 transmits the movement to the execution unit.

P100560LU00 8 LU102066 À dovetail guide rail 502 is arranged on the bracket 5. À dovetail groove 704 is arranged at the bottom of the connecting member 7. The connecting member 7 and the bracket 5 are installed through the dovetail groove 704 and the dovetail guide rail 502, thus ensuring the linear movement of the moving lead screw 18.

À force bearing block 503 is arranged on the bracket 5, and a plurality of threaded holes are arranged to fix the box body 10 of the braking mechanism 3 and the moment motor 12. The bottom of the bracket 5 is provided with reinforcing ribs 501 to improve the use performance of the bracket 5.

Four smooth round holes 701 with consistent hole centers are respectively formed in the connecting member 7, the force bearing block 503 and the movable brake shoe 26. The round guide rail 25 passes through the connecting member, the force bearing block and the movable brake shoe. One end of the round guide rail 25 is provided with screw threads to be in threaded connection with the movable brake shoe 26. The other end of the round guide rail 25 is provided with screw threads to fix the round guide rail 25 onto the connecting member 7. The round guide rail 25 is configured to connect the movable brake shoe 26 and the connecting member 7. When the moving lead screw 18 does linear movement, the connecting member 7 and the movable brake shoe 26 are driven to move.

À support surface with a diameter less than a major diameter of the belleville spring 24 is arranged at the tail end of the guide member 27. The other end of the guide member 27 is in threaded connection with the movable brake shoe 26.

A distance between the belleville spring 24 and the force bearing block 503 can be controlled by controlling a threaded feeding distance between the guide member 27 and the movable brake shole 26, so as to ensure that the belleville spring 24 is in a slightly compressed state or maintains a to-collide but un-collided state with the force bearing block 503 in a braking state. During brake releasing, the belleville spring 24 tightly compresses the force bearing block 503, and impact force of the braking mechanism in the braking process can be reduced by properly compressing the belleville spring 24. When the moment motor 12 reversely rotates, the moving lead screw 18 drives the belleville spring 24 to be compressed onto the force bearing block 503. At this time, the belleville spring 24 is in an energy absorption state. The braking mechanism 3 performs brake releasing. In the brake releasing process, the movable brake shoe 26 is driven by the connecting member 7 to leave away from the roller 1. The belleville spring 24 is in

P100560LU00 9 LU102066 contact with the force bearing block 503, so that the belleville spring 24 is compressed. The buffering is effectively reduced, and the service life of mechanical parts is prolonged.

When the moment motor 12 positively rotates, the belleville spring 24 leaves away from the force bearing block 503, the belleville spring 24 releases energy, and the braking mechanism 3 brakes. The belleville spring 24 can effectively absorb and release energy, the impact force is reduced, and the service life of machinery is prolonged.

The parking mechanism includes a trapezoidal lead screw 30, clamp blocks 31, a linear guide rail 32 and a guide rail support frame 33. One end of the clamp block 31 is installed on the trapezoidal lead screw 30. The other end of the clamp block 31 is installed on the linear guide rail 32. The linear guide rail 32 is installed on the guide rail support frame 33.

A step motor 8 is installed at one end of the trapezoidal lead screw 30. The step motor 8 is used as a power source. An output shaft of the step motor 8 is connected with the trapezoidal lead screw 30 through a second shaft coupler 28.

The trapezoidal lead screw 30 is divided into a left portion and a right portion. A left end lead screw 3001 and a right end lead screw 3002 of the trapezoidal lead screw 30 have opposite screwing directions of screw threads. The left end lead screw 3001 is in threaded connection with the clamp block 31. The right end lead screw 3002 is in threaded connection with the clamp block 31.

A round hole is formed in the lower ends of the two clamp blocks 31. The smooth linear guide rail 32 passes through the round hole. The linear guide rail 32 is configured to limit a displacement direction of the clamp blocks 31. The 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 set screws. The guide rail support frame 33 is fixed to the box body 10 through screws, so as to ensure that the clamp blocks 31 can move normally in the work process.

When the step motor 8 rotates, the trapezoidal lead screw 30 is driven to move, so that the two clamp blocks 31 move toward each other or away from each other in opposite directions. When the step motor 8 positively rotates, the trapezoidal lead screw 30 is driven to rotate, so that the clamp blocks 31 tightly clamp the worm 14, and the parking is completed. When the step motor 8 reversely rotates, the trapezoidal lead screw 30 is driven to rotate, so that the two clamp blocks 31 move away from each other in opposite

P100560LU00 10 LU102066 directions to release the worm 14, and the parking is completed.

In the braking process, the parking mechanism is started. The trapezoidal lead screw 30 is driven to rotate by the rotation of the step motor 8, so that the clamp blocks 31 on the two sides move toward each other in opposite directions along the linear guide rail 32 to tightly clamp the worm 14, the braking of the mine hoist is finally completed, and the car slipping phenomenon caused by inertia is avoided.

A hole and a step motor connecting port 1005 are formed in the box body 10, thus facilitating the connection of a structure inside the box body 10 with the external moment motor 12 and the step motor 8. A box cover 9 is arranged on the box body 10, so that contaminants cannot enter a transmission structure in the box body 10, and the influence on the braking precision is avoided.

A contact head 260 is installed at the top end of the movable brake shoe 26. A fluid storage cavity 265 and at least three slide grooves 266 are formed in the contact head 260. The fluid storage cavity 265 communicates with the slide grooves 266, and a contact post head 262 is installed in the slide groove 266. One end of the contact post head 262 extends out of the slide groove 266. À rubber pad is installed at one end of the contact post head 262 extending out of the slide groove 266. The rubber pad can increase the friction of a contact surface. A position limiting block 267 is installed at one end of the contact post head 262 positioned in the slide groove 266. À first sealing ring is installed at an outer ring of the position limiting block 267. An outer ring of the first sealing ring is tightly attached to an inner wall of the slide groove 266. The fluid storage cavity 265 is filled with liquid.

When the braking mechanism 3 starts braking, the movable brake shoe 26 drives the contact post heads 262 to move toward a surface to be braked, and the top ends of the contact post heads 262 are in contact with the surface to be braked. When the surface to be braked is uneven, contact points of the contact post heads 262 with the surface to be braked are not in the same plane. Convex points of the surface to be braked extrude the contact post heads 262 to backward contract, the backward contracted contact post heads 262 extrude liquid in the located slide grooves 266 to flow toward the fluid storage cavity

265. Concave points of the surface to be braked are not in contact with the contact post heads 262. The front ends of positions of the contact post heads 262 not in contact with the surface to be braked are not subjected to the pressure, the liquid flows to the located

P100560LU00 11 LU102066 slide grooves 266 of the contact post heads 262 not in contact with the surface to be braked until the pressure applied to ail of the contact post heads 262 and the surface to be braked is balanced. The liquid in the fluid storage cavity 265 can achieve a buffering effect. All of the contact post heads 262 maintain a balanced state, so that the stress of the contact points of the surface to be braked with the contact post heads 262 is uniform, and the surface to be braked is tightly pressed, so that the contact head 260 is applicable to the uneven surface to be braked.

In practical application, when a component requiring braking is small-size machinery, the contact post heads 262 on the contact head 260 are not completely in contact with the surface to be braked. The original contact post heads 262 may not be able to realize the braking on a small-size plane.

A lateral clamping block 263 is installed at one end of the contact post head 262 extending out of the slide groove 266 in a hinged way. A linkage rod 264 is installed at a middle portion of the lateral clamping block 263 in a hinged way. A moving groove 261 is formed in an upper surface of the contact head 260. A moving slide block is installed in the moving groove 261. The moving slide block does linear movement along the moving groove 261. The moving slide block is hinged to the linkage rod 264. When the surface to be braked is the small-size plane, the surface to be braked is in contact extrusion with the top ends of a part of contact post heads 262. The contact post heads 262 in contact with the surface to be braked move toward the inside of the contact head 260 and extrudes liquid in the fluid storage cavity 265, so that the liquid flows toward the located slide grooves 266 of the contact post heads 262 not in contact with the surface to be braked. The contact post heads 262 not in contact with the surface to be braked move toward the outside of the contact head 260, one end of the lateral clamping block 263 hinged to the contact post head 262 is driven to move in a direction away from the contact head 260. Under the effects of the moving slide block and the linkage rod 264, one end of the lateral clamping block 263 not in contact with the contact post head 262 moves in a direction of approaching the contact head 260, and one end of the lateral clamping block 263 not in contact with the contact post head 262 is in contact with and tightly pressed against a side surface of machinery to be braked, so that both the end surface and the side surface of the machinery to be braked are affected by the braking force. The braking is more reliable, so that the braking effect on the small-size machinery

P100560LU00 12 LU102066 is achieved.

When the surface to be braked is a large-size plane, the surface to be braked is in contact extrusion with the lateral clamping block 263. Under the effect of the connecting rod and the moving slide block, one end of the lateral clamping block 263 not connected with the contact post head 262 moves in a direction of approaching the contact head 260, and all of the contact post heads 262 are in contact with the surface to be braked, and the braking effect can be realized.

Work principle: The moment motor 12 is controlled to rotate. The worm gear 16 is driven to rotate through the worm 14, so that the screw nut 15 rotates to drive the moving lead screw 18 to do linear movement. The moving block 19 transmits the movement to the connecting member 7. The connecting member 7 does linear movement along the dovetail guide rail 502 and drives the movable brake shoe 26, the belleville spring 24 and the guide member 27 to move in a direction of the roller 1 until the movable brake shoe 26 tightly presses the roller 1.

The parking unit is started. The step motor 8 provides a power source. The trapezoidal lead screw 30 is driven to rotate, so that the clamp blocks 31 move toward each other in opposite directions along the linear guide rail 32 to tightly clamp the worm 14, the occurrence of the car slipping phenomenon is prevented, and the braking process is completed.

When the braking mechanism 3 performs brake releasing, the parking mechanism is started, so that the clamp blocks 31 move away from each other in opposite directions to release the originally clamped worm 14, and then, the moment motor 12 is controlled to reversely rotate so as to drive the movable brake shoe 26 to do linear movement away from the roller 1, thus realizing the brake releasing of the braking mechanism 3.

During experiment, a programmable logic controller is connected with the moment motor 12, and a digital signal and an analog signal are sent to the moment motor 12 through the programmable logic controller.

A distance from an installation position of the braking mechanism 3 to the roller 1 is in a range of 1 mm to 2 mm. The programmable logic controller and the moment motor 12 are connected with a 220 V alternating current power supply. A positive rotation instruction is sent to the moment motor 12 through the programmable controller, so that

P100560LU00 13 | LU102066 the moment motor 12 positively rotates to drive the movable brake shoe 26 to move to a position about 1.5 mm away from the roller 1.

The magnitudes of the rotating speed and moment of the moment motor 12 are regulated by sending an instruction by the programmable logic controller, so that the control on the braking force and the braking response time of the braking device is realized.

The step motor 8 is connected to a 24 V power supply. Additionally, the output shaft of the step motor 8 is connected with the trapezoidal lead screw 30 through the shaft coupler, and an instruction is sent by the programmable logic controller to the step motor 8 to control the positive and reverse rotation of the step motor 8. Realizing the control by the programmable logic controller has the advantages that the real-time regulation and control on the braking force and the braking response time of the braking mechanism 3 can be realized by using a feedback signal of the moment motor

12. Secondly, the structure of the whole electro-mechanical braking device is applicable to an ultra-deep mine hoist, the mounting and the dismounting are convenient, and a series of problems of leakage and the like caused by hydraulic driving are avoided. Experiment result analysis of experiment tests of the device of the present invention is further provided hereafter. The magnitude of the braking force is the most direct reflection on the braking effect of the braking mechanism 3. In order to obtain a relationship among the magnitude of the braking force, the current and the stroke under the locked-rotor condition of a braking tread, the following experiment was performed. The steps were as follows: 1) According to the braking requirements of the mine hoist, the moment motor 12 and the braking mechanism 3 were well installed and fixed.

2) The execution unit in the braking mechanism 3 was well installed and fixed, so as to ensure that the movable brake shoe 26 could do linear movement along with the operation of the moment motor 12.

3) The transmission unit in the braking mechanism 3 was installed in a predetermined position inside the box body 10, so as to ensure that the transmission unit could complete the movement transmission.

4) The step motor 8 was installed on the box body 10 of the braking mechanism 3, so as to ensure that the parking unit could operate normally under the locked-rotor condition

P100560LU00 14 of the moment motor 12, i.e., when the movable brake shoe 26 was in contact with the 2000 roller 1.

5) The power supply was switched on. A program was input into the programmable logic controller. The operation of the moment motor 12 and the step motor 8 was controlled through the instruction sent by the programmable logic controller. The rotating direction of the moment motor 12 was changed through the digital signal sent by the programmable logic controller. The magnitudes of the output transmission force and the transmission speed of the moment motor 12 were changed through the analog signal. Through a pulse signal sent by the programmable logic controller, the positive and reverse rotation of the step motor 8 was controlled to realize the parking in the braking process.

6) The stroke of the trapezoidal lead screw 30 under the locked-rotor condition of the braking mechanism 3 was changed. The moment motor 12 drove the braking device to work. A spoke type sensor and a weighing display output the magnitudes of the braking force of the trapezoidal lead screw 30 in different stroke states under the locked-rotor condition of the braking device. The braking force of the braking mechanism 3 during braking and brake releasing under the conditions that the strokes of the trapezoidal lead screw 30 were 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm and 0.75 mm was read and shown in Table 1.

7) Through the programmable logic controller, the magnitude of the output analog quantity was changed, i.e., the magnitude of the current was changed. The moment motor 12 was used for driving. The magnitude of the braking force of the braking mechanism 3 under the condition of different currents was observed, and two groups of measured experiment data were shown in Table 2.

(1) Relationship between braking force of braking device and stroke In the stroke range of the braking tread, the spoke type sensor and the movable brake shoe 26 were placed in the same horizontal plane, and were in a to-collide but un-collided state. The magnitude of the stroke of the trapezoidal lead screw 30 was set through Kollmorgen Workbench software, and the relationship between the stroke of the trapezoidal lead screw 30 and the braking force under the locked-rotor condition was observed. 3 groups of experiments were continuously performed. 6 magnitudes of the stroke of the trapezoidal lead screw 30 were set: 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7

P100560LU00 15 LU102066 mm, and 0.75 mm. The moment motor 12 was driven to work. Data displayed by the weighing display was observed. The relationship between the stroke of the braking tread and the locked-rotor moment was obtained through analysis. Three groups of change conditions of the braking force of the braking mechanism 3 under each determined stroke were as follows: Table 1 Table of relationship between braking force and stroke: Stroke/mm 0.5 0.55 0.6 0.65 0.7 0.75 PT TT ES ST us Advancing braking force /KN 8.83 10.86 1135 12.72 14.08 15.55

A Retreating braking force 1/KN 6.05 7.55 9.19 11.04 13.10 m —_— Advancing braking force 2/KN 8.45 9.93 1146 13.06 14.67 16.26 _— ET Retreating braking force 2/KN 6.47 8.0 9.77 11.66 13.86 --- me eee Advancing braking force 3/KN 7.56 9.1 10.66 12.32 14.1 15.8 ee ee eee eee rer rl Retreating braking force 3/KN 5.95 7.5 9.23 11.7 13.9 --- Through information in the table, it could be seen that under the locked-rotor condition of the braking mechanism 3, when a stroke distance of the trapezoidal lead screw 30 was increased, the magnitude of the braking force of the braking mechanism 3 could also be increased. Therefore, if the contact between the braking tread and an object to be braked was tighter, the braking force was greater, and the braking effect was better. Therefore, in the solution of the present invention, it is feasible to realize braking by tightly pressing the roller 1 through the movable brake shoe 26. (2) Relationship between magnitude of braking force of braking device and current The moment motor 12 changed the magnitude of current of the moment motor 12 through the analog signal input by the programmable logic controller. The magnitude of the braking force of the braking mechanism 3 was further controlled. In order to obtain the relationship between the braking force and the current, the moment motor 12 was driven to operate. A plurality of groups of experiment data were measured and were as follows. Table 2 Table of relationship between braking force and current: ee eee ‘rar 2 1100J Sequence KA) 3.75 4.5 5.25 6.0 6.75 7.6 number —_—

P100560LU00 16 C0 FAN 36 780 178 D278 1691 18a 07066 Sequence Ay 3.6 4.6 5.25 6.45 6.9 7.75 number 2 F(KN) 4.33 5.7 8.7 16.5 19.8 21.23 According to the above experiment data, it was shown that the braking force of the braking mechanism 3 increased along with increase of the current. Therefore, the magnitude of the braking force of the braking mechanism 3 could be controlled by changing the magnitude of the analog quantity output by the programmable logic controller to the moment motor 12, so that a series of problems caused by hydraulic oil leakage in a traditional hydraulic braking mode are avoided.

In the description of this specification, the description of the reference terms "one embodiment”, "example", and "specific example” means that the specific features, structures, materials or characteristics described with reference to the embodiment or example are included in at least one embodiment or example of the disclosure. In the specification, schematic descriptions of the foregoing terms do not need to be specific to a same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in an appropriate manner.

The basic principles, main features and advantages of the disclosure have been shown and described above. À person skilled in the art should understand that the disclosure is not limited by the foregoing embodiments, descriptions in the foregoing embodiments and the specification merely describe the principles of the disclosure, various changes and improvements may be made to the disclosure without departing from the spirit and scope of the disclosure, and such changes and improvements shall all fall within the protection scope of the disclosure.

Claims

P100560LU00 17 LU102066 CLAIMS What is claimed is:

1. À braking device of a mine hoist, comprising a roller (1), a support frame (2) and a braking mechanism (3), wherein the roller (1) is installed on the support frame (2), the braking mechanism (3) is installed on the support frame (2), a bracket (5) is installed on the support frame (2), and the braking mechanism (3) is installed on the bracket (5); and the braking mechanism (3) comprises 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.

2. The braking device of a mine hoist according to claim 1, wherein the transmission unit comprises a worm gear (16), a worm (14), a moving lead screw (18), a screw nut (15) and rolling balls (23), the worm gear (16) and the worm (14) are engaged with each other, an inner ring of the worm gear (16) is coaxially installed at an outer ring of the screw nut (15), and an inner ring of the screw nut (15) is cooperatively installed with the moving lead screw (18) through the rolling balls (23).

3. The braking device of a mine hoist according to claim 2, wherein one end of the worm (14) is provided with a mechanical brake releasing end (22).

4. The braking device of a mine hoist according to claim 2, wherein a threaded hole is formed in one end of the moving lead screw (18), a moving block (19) is installed in the threaded hole in a threaded fit way, and the moving block (19) is connected with the execution unit.

5. The braking device of a mine hoist according to claim 1, wherein the execution unit comprises a static brake shoe (4), a movable brake shoe (26), a round guide rail (25), a connecting member (7), a belleville spring (24) and a guide member (27), the static brake shoe (4) is installed on one side of the support frame (2), the movable brake shoe (26) is installed 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 round guide rail (25) and the movable brake shoe (26) are connected with the connecting member (7), the connecting member (7) is connected with a moving block (19), the belleville spring (24) is installed on the guide member (27), and the guide member (27) is connected with the movable brake shoe (26).

6. The braking device of a mine hoist according to claim 1, wherein the parking mechanism comprises a trapezoidal lead screw (30), clamp blocks (31), a linear guide rail

P100560LU00 18 LU102066 (32) and a guide rail support frame (33), one end of the clamp block (31) is installed on the trapezoidal lead screw (30), the other end of the clamp 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).

7. The braking device of a mine hoist according to claim 6, wherein the trapezoidal lead screw (30) is divided into a left portion and a right portion, a left end lead screw (3001) and a right end lead screw (3002) of the trapezoidal lead screw (30) have opposite screwing directions of screw threads, the left end lead screw (3001) is in threaded connection with the clamp block (31), and the right end lead screw (3002) is in threaded connection with the clamp block (31).

8. The braking device of a mine hoist according to claim 5, wherein a contact head (260) is installed at a top end of the movable brake shoe (26), a fluid storage cavity (265) and at least three slide grooves (266) are formed in the contact head (260), the fluid storage cavity (265) communicates with the slide grooves (266), the fluid storage cavity (265) is filled with liquid, a contact post head (262) is installed in the slide groove (266), one end of the contact post head (262) extends out of the slide groove (266), and a position limiting block (267) is installed at one end of the contact post head (262) positioned in the slide groove (266).

9. The braking device of a mine hoist according to claim 8, wherein a lateral clamping block (263) is installed at one end of the contact post head (262) extending out of the slide groove (266) in a hinged way, a linkage rod (264) is installed at a middle portion of the lateral clamping block (263) in a hinged way, a moving groove (261) is formed in an upper surface of the contact head (260), a moving slide block is glidingly installed in the moving groove (261), and the moving slide block is hinged to the linkage rod (264).