Lifting and hoisting mechanism applicable to boiler furnace maintenance lifting platform

Abstract

The utility model discloses a lifting and hoisting mechanism suitable for a boiler furnace maintenance lifting platform, which comprises a speed reducer, and the speed reducer comprises a high-speed shaft and a low-speed shaft which are bilaterally symmetrical; the motor is connected with a high-speed shaft on one side of the speed reducer through a coupling; a bearing seat is arranged on the outer side of the winding drum, and the winding drum is installed at the outer end of the low-speed shaft in a bilateral symmetry mode; the working brake is connected with the high-speed shaft through a coupling; the safety brake is mounted on the outer side of the winding drum; the encoder is mounted at the outer end of the bearing seat on one side; the height limiter is mounted at the outer end of the bearing seat on the other side; when in use, the safety brake is not provided with a hydraulic station and an oil pipe, and is simple to mount and debug; the safety brake is compact in size and does not occupy space; the response time is short, the response speed is high and reaches within 0.1 S, flexible and safe braking can be achieved, and car sliding is avoided.

Description

Technical Field

[0001] The utility model relates to the field of boiler furnace maintenance lifting platforms used in thermal (thermal) power plants, in particular to a lifting and hoisting mechanism. Background Art

[0002] The GJPT-J series winch-type boiler furnace maintenance lifting platform used in thermal (thermal) power plants is divided into two parts: the furnace maintenance platform and the furnace external transmission system. The furnace external transmission system is set on the large plate beam outside the furnace roof. The furnace external transmission system consists of: lifting and hoisting mechanism, pulley block, electric control cabinet system, etc. The lifting and hoisting mechanism drives the furnace maintenance platform in the furnace through the hoisting wire rope, forming a high-altitude manned working machine, which is convenient for thermal (thermal) power plant maintenance personnel to stand on the lifting platform to realize the maintenance of various parts in the upper and lower parts of the furnace and complete the construction work.

[0003] Most of the external transmission systems of winch-type boiler furnace maintenance lifting platforms installed before 2018 use a single hydraulic brake winch without a safety brake. They rely only on the three-phase hydraulic brake installed at the high-speed shaft end of the reducer, and brake every time the motor is powered off. When the reducer gear fails or the low-speed shaft end breaks and separates, the low-speed output shaft end cannot be braked, which poses a major safety hazard.

[0004] In recent years, after the promulgation and implementation of GB / T 34029-2017 "Boiler Furnace Maintenance Lifting Platform" and T / CEC162-2018 "Power Station Boiler Furnace Maintenance Platform" standards, the installed winch-type boiler furnace maintenance lifting platform adopts a two-wing winch for the external transmission system, and dual brake control is adopted at the high-speed and low-speed ends; usually, there is a set of three-phase hydraulic brakes on both sides of the high-speed end of the reducer, and a set of safety brakes on the outside of the wire rope drum at the low-speed end of both wings. Safety brakes are mostly belt-type and hydraulic caliper-disc types, and there are also ratchet-pawl types. Belt-type and ratchet-pawl safety brakes are obsolete technologies, and some companies have explicitly prohibited their use; hydraulic caliper-disc power sources require hydraulic pump stations. The hydraulic pump station is in a non-working state for a long time, and the aging and leakage risks of the pipelines are difficult to avoid. The clearance of the friction plate needs to be adjusted from time to time after partial wear. In addition, due to the large amount of dust on the boiler roof, it adheres to the gap of the hydraulic clamp disc friction plate. When the disc spring is closed, the friction plate is prone to eccentric wear, resulting in a large change in the working stroke. If the gap is not adjusted in time, there is a hidden danger of insufficient braking force. The most important thing is that the reaction time of these types of safety brakes is relatively long, which does not meet the requirements of national standards. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, the purpose of the utility model is to provide a lifting winch mechanism suitable for a boiler furnace maintenance lifting platform. The utility model provides the following technical solutions:

[0006] The hoisting winch mechanism comprises:

[0007] A reducer, the reducer comprising a high-speed shaft and a low-speed shaft that are bilaterally symmetrical;

[0008] A motor, the motor being connected to a high-speed shaft on one side of the reducer through a coupling;

[0009] A reel, wherein a bearing seat is disposed on the outer side of the reel, wherein the bearing seat comprises a bearing seat on one side and a bearing seat on the other side, and the reel is symmetrically mounted on the outer end of the low-speed shaft;

[0010] A working brake, the working brake is symmetrically connected to the high-speed shaft through a coupling;

[0011] A safety brake, the safety brake being installed bilaterally symmetrically on the outside of the reel;

[0012] An encoder, the encoder is mounted on the outer end of the bearing seat on one side;

[0013] A height limiter is installed at the outer end of the support seat on the other side.

[0014] Furthermore, the reel comprises:

[0015] A brake disc, the brake disc being arranged on the outer side of the reel;

[0016] A wire rope baffle is evenly arranged on the drum.

[0017] Furthermore, the portion of the brake disc that exceeds the diameter of the wire rope retaining disc is the brake disc friction surface.

[0018] Furthermore, the safety brake adopts the electromagnetic failure and normally closed braking principle, does not require other external power sources, and is an electromagnetic self-braking safety brake with an electromagnetic self-locking structure. The safety brake includes:

[0019] A base, on which the safety brake is integrally mounted;

[0020] A brake block is provided with an action monitoring switch and a brake release reset bolt.

[0021] Furthermore, the brake block is wedge-shaped, with two blocks on the left and right.

[0022] Furthermore, a friction plate is provided on the inner side of the brake block.

[0023] Furthermore, a brake caliper opening is left in the middle of the brake block.

[0024] Furthermore, the brake release and reset bolt is used to release the manual brake release and reset when the electromagnetic self-braking safety brake is in braking operation.

[0025] Compared with the prior art, the beneficial effects of the utility model are:

[0026] The safety brake of the utility model adopts the electromagnetic failure and normally closed braking principle, does not require any external power source, and is an electromagnetic self-braking safety brake with an electromagnetic self-locking structure; the safety brake realizes electromagnetic self-braking, which solves the hidden dangers of large hydraulic station volume, space occupation and oil leakage, small brake pad retraction distance, and difficult clearance adjustment, which requires the trouble of professional debugging every time it is activated.

[0027] (2) When the utility model is used, the safety brake has no hydraulic station, no oil pipe, simple installation and debugging, no oil leakage risk, no oil pipe and hydraulic station maintenance; compact size, no space; short response time, fast reaction, reaching within 0.1S, and can brake flexibly and safely without slipping.

[0028] (3) When there is no accident in the hoisting winch mechanism, the safety brake only slightly clamps the brake disc. When an accident occurs, driven by the clamping friction force, the two wedge-shaped brake blocks rely on inertia self-locking braking to enter the dovetail groove, thereby clamping the brake disc.

[0029] (4) The utility model can be used in the range of -30℃ to 60℃ and is less affected by temperature.

[0030] (5) The safety brake in the utility model is installed vertically up and down to reduce the falling of dust and is not disturbed by dust. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of a lifting and hoisting mechanism applicable to a boiler furnace maintenance lifting platform of the utility model;

[0032] Figure 2 This is a front view of a lifting and hoisting mechanism applicable to a boiler furnace maintenance lifting platform of the utility model;

[0033] Figure 3 It is a side view of a lifting winch mechanism applicable to a boiler furnace maintenance lifting platform of the utility model;

[0034] Figure 4 This is a partial installation diagram of a safety brake in a hoisting winch mechanism applicable to a boiler furnace maintenance lifting platform of the utility model;

[0035] Figure 5 It is a working top view of a safety brake in a lifting and hoisting mechanism applicable to a boiler furnace maintenance lifting platform of the utility model;

[0036] In the figure: 1. reducer; 101. high-speed shaft; 102. low-speed shaft; 2. motor; 3. drum; 301. bearing seat; 302. brake disc; 303. wire rope baffle; 304. brake disc friction surface; 4. working brake; 5. safety brake; 501. brake block; 502. action monitoring switch; 503. brake caliper; 504. friction plate; 505. base; 6. encoder; 7. height limiter; 8. wire rope. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0038] like Figure 1-5 As shown, the utility model provides a lifting winch mechanism suitable for a boiler furnace maintenance lifting platform, including a reducer 1, a motor 2, a drum 3, a working brake 4, a safety brake 5, an encoder 6 and a height limiter 7, wherein a high-speed shaft 101 is provided on the left and right sides of the input end of the reducer 1, and a low-speed shaft 102 is provided on the left and right sides of the output end of the reducer 1; the shaft end of the motor 2 is connected to the high-speed shaft 101 on one side of the reducer 1 through a coupling; one end of the drum 3 is connected to the low-speed shaft 102 at the output end of the reducer 1, and the other end is installed on the bearing seat 301; the working brake 4 is installed on the coupling of the high-speed shaft 101, and the safety brake 5 is installed on the outside of the drum 3.

[0039] The reducer 1 adopts a three-stage cylindrical gear slow gear reducer, and the reducer 1 is a double input high-speed shaft 101 and a double output low-speed shaft 102 that are symmetrical on both sides; the couplings at the outer ends of the left and right high-speed shafts 101 of the reducer 1 are both equipped with working brakes 4, and the working brakes 4 are three-phase hydraulic drum type; the outer ends of the left and right low-speed shafts 102 of the reducer 1 are both equipped with reels 3. The outer side of the reel 3 is provided with a brake disc 302, and the thickness of the brake disc 302 is generally above 25mm. The part of the brake disc 302 that is larger than the inner wire rope retaining disc 303 of the reel 3 is the brake disc friction surface 304.

[0040] The safety brake 5 adopts a wedge-shaped self-locking structure and is equipped with an action monitoring switch 502 for interlocking protection and fault feedback. The safety brake 5 is installed symmetrically on the outside of the drum 3 and supported by a base 505. The safety brake 5 adopts a normally closed design. A brake caliper 503 is left in the middle of the wedge-shaped brake blocks 501 on the left and right sides. The brake caliper 503 is engaged with the friction surface 304 of the brake disc. The brake caliper 503 is installed at a lower position of the brake disc 302. The tip of the wedge-shaped brake block 501 is opposite to the lead-out direction of the hoisting wire rope 8.

[0041] The safety brake adopts the electromagnetic failure and normally closed braking principle, does not require other external power sources, and is an electromagnetic self-braking safety brake with an electromagnetic self-locking structure; when the electromagnetic fails, the safety brake works, and the braking work is completed by wedging the wedge-shaped brake block 501 downward.

[0042] The encoder 6 is installed at the outer end of the bearing seat 301 on one side of the reel 3, and is connected coaxially with the reel 3, and is used to detect the overspeed signal of the low-speed shaft 102; the height limiter 7 is installed at the outer end of the bearing seat 301 on the other side of the reel 3, and is connected coaxially with the reel 3. Through the speed ratio conversion of the low-speed shaft 102, the high and low lifting strokes of the maintenance lifting platform in the furnace are limited.

[0043] When the working brake 4 fails and the torque or speed at the low-speed end of the hoisting winch mechanism exceeds a certain limit value, the safety brake 5 realizes emergency automatic safety braking of the hoisting winch mechanism to achieve the performance of safe lifting and lowering of the maintenance lifting platform in the furnace.

[0044] Working principle of safety brake 5: power on to release the brake, power off to engage the brake. When the electromagnetic coil loses power and the brake disc 302 continues to rotate, under the action of the friction between the wedge-shaped brake block 501 and the friction surface 304 of the brake disc, the wedge-shaped brake block 501 moves along the tangential direction of the brake disc 302, and the wedge-shaped brake block 501 wedges downward, so that the wedge-shaped brake block 501 clamps the brake disc 302 through the friction surface 304 of the brake disc, and the safety brake 5 is engaged to complete the braking work and self-lock. The safety brake 5 participates in emergency safety braking when the working brake 4 fails or the hoisting winch mechanism fails unexpectedly (slipping) or other transmission components fail; when the hoisting winch mechanism works normally, the safety brake 5 does not participate in braking.

[0045] When the hoisting mechanism breaks the shaft, hits the gear, or fails the coupling, when the encoder 6 of the hoisting mechanism detects an overspeed signal or the equipment emergency stop button is pressed, the power supply of the motor 2, the working brake 4, and the safety brake 5 is disconnected at the same time. The safety brake 5 delays the clamping of the brake disc friction surface 304 after the working brake 4 is applied, so as to realize the emergency automatic safety braking of the hoisting mechanism. When the hoisting mechanism fails, it is prevented that the maintenance lifting platform in the furnace has a large inertia of sliding down and cannot be safely braked in time due to the delayed reaction time of the working brake 4 or other types of safety brakes.

[0046] When releasing the braking work of the safety brake 5, it is only necessary to jog the motor 2 to rotate the hoisting winch in the ascending direction, and the two wedge-shaped brake blocks 501 equipped with friction plates 504 will retreat until they are completely reset. If they cannot be completely retreated and reset, the two brake release reset bolts can be manually operated to synchronously and evenly rotate the wedge-shaped brake blocks 501 through the brake release reset holes on the end plate, and pull them back so that the roller of the action monitoring switch 502 presses against the wedge-shaped brake blocks 501, the switch is closed, and manual reset is achieved.

[0047] When the hoisting winch mechanism fails and the boiler furnace maintenance lifting platform is suspended in the air in the furnace, the two brake release reset bolts can be manually operated to synchronously and evenly rotate the wedge-shaped brake blocks 501 gradually and progressively on the left and right sides to slowly lower the boiler furnace maintenance lifting platform little by little to achieve manual descent.

[0048] The safety brake 5 in the utility model adopts the electromagnetic failure and normally closed braking principle, and does not require other external power sources; the electromagnetic mechanism adopts low-voltage DC control, high-voltage excitation, and low-voltage maintenance, which achieves energy saving and consumption reduction while improving safety and life; the structure is compact and lighter than other brake products of the same specification, and the braking force is proportional to the load force. The greater the load force, the greater the braking force, which is safe and reliable; safety braking is performed only when the lifting winch mechanism fails or malfunctions, achieving a truly fail-safe braking function.

[0049] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A hoisting winch mechanism suitable for a boiler furnace maintenance lifting platform, characterized in that: include: A reducer, the reducer comprising a high-speed shaft and a low-speed shaft that are bilaterally symmetrical; A motor, the motor being connected to a high-speed shaft on one side of the reducer through a coupling; A reel, wherein a bearing seat is disposed on the outer side of the reel, wherein the bearing seat comprises a bearing seat on one side and a bearing seat on the other side, and the reel is symmetrically mounted on the outer end of the low-speed shaft; A working brake, the working brake is symmetrically connected to the high-speed shaft through a coupling; A safety brake, the safety brake being installed bilaterally symmetrically on the outside of the reel; An encoder, the encoder is mounted on the outer end of the bearing seat on one side; A height limiter is installed on the outer end of the bearing seat on the other side.

2. The hoisting winch mechanism applicable to the boiler furnace maintenance lifting platform according to claim 1 is characterized in that: The reel comprises: A brake disc, the brake disc being arranged on the outer side of the reel; A wire rope baffle is evenly arranged on the drum.

3. The hoisting winch mechanism applicable to the boiler furnace maintenance lifting platform according to claim 1 is characterized in that: The safety brake adopts the electromagnetic failure and normally closed braking principle, does not require other external power sources, and is an electromagnetic self-braking safety brake with an electromagnetic self-locking structure, including: A base, on which the safety brake is integrally mounted; A brake block is provided with an action monitoring switch and a brake release reset bolt.

4. The hoisting winch mechanism applicable to the boiler furnace maintenance lifting platform according to claim 2 is characterized in that: The portion of the brake disc that exceeds the diameter of the wire rope retaining disc is the brake disc friction surface.

5. The hoisting winch mechanism applicable to the boiler furnace maintenance lifting platform according to claim 3 is characterized in that: The brake block is wedge-shaped and has two left and right blocks.

6. The hoisting winch mechanism applicable to the boiler furnace maintenance lifting platform according to claim 3 is characterized in that: A friction plate is arranged on the inner side of the brake block.

7. The hoisting winch mechanism applicable to the boiler furnace maintenance lifting platform according to claim 5 is characterized in that: A brake caliper opening is reserved in the middle of the brake block.

8. The hoisting winch mechanism applicable to the boiler furnace maintenance lifting platform according to claim 3 is characterized in that: The brake release and reset bolt is used for releasing the manual brake release and reset when the electromagnetic self-braking safety brake is in braking operation.

Images