Safe lifting and transferring device for hydropower station tail water flow channel maintenance and using method thereof

Abstract

The invention relates to the field of fire safety, in particular to a safe lifting and transferring device for hydropower station tail water flow channel overhauling and a using method thereof.The safe lifting and transferring device comprises a tail water flow channel, an inlet door installed on the outer wall of the tail water flow channel and a platform arranged outside the tail water flow channel; and the hoisting piece is arranged above the platform and comprises a connecting frame and a hoisting frame which are connected with each other, and the connecting frame and the hoisting frame are arranged on the two sides of the access door respectively. In the cage mounting process, other special tools are not needed, mounting personnel do not need to enter the outer side of a door for operation, the mounting operation difficulty and safety risk factors are greatly reduced, the sliding guide rail of the tool is fast and convenient to disassemble, the working efficiency of the mounting process and follow-up operation is improved, and the whole set of tool is easy and convenient to manufacture, transport and assemble; and the device can be flexibly used in various workplaces with related requirements.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fire safety, and particularly to a safe lifting and transferring device for overhauling a tail water channel of a hydropower station and a use method thereof. BACKGROUND

[0002] After long-term operation of the hydraulic structure of a hydropower station, defects such as damage, cracks and leakage may occur due to water erosion and material aging, which may threaten the structural safety and operation stability if not handled in time. Therefore, personnel need to be arranged to enter the tail water channel to check and handle the defects on a regular basis. However, due to the special structure of the tail water channel, there is no open space to install conventional lifting mechanisms and cages in the area, and personnel and equipment can only enter and exit through the tail water cone pipe entrance, increasing the complexity of the operation. In the prior art, personnel rely on self-climbing devices to enter and exit the tail water cone pipe entrance, which is limited by battery capacity and has low efficiency; when transferring long objects such as scaffolds required for the side, top and arch, the self-climbing device cannot meet the transfer requirements; when transferring a large amount of materials, a winch in the tail water disc valve operation corridor needs to be used to complete the operation through a steel wire rope, a fixed pulley support, a basket and a runner maintenance platform hoist hole, which is a complicated and time-consuming process and has safety risks, and cannot meet the efficient and safe maintenance requirements. SUMMARY

[0003] Therefore, the technical problem to be solved by the present application is the low efficiency of personnel relying on self-climbing devices to enter and exit the tail water cone pipe entrance in the prior art.

[0004] The above technical problem is solved by the following technical solution: the present application provides a safe lifting and transferring device for overhauling a tail water channel of a hydropower station, which includes a tail water channel, an entrance door installed on the outer wall of the tail water channel, and a platform arranged outside the tail water channel; a hoisting member arranged above the platform, the hoisting member including a connecting frame and a lifting frame connected thereto, and the connecting frame and the lifting frame being arranged on both sides of the entrance door, respectively; a cage arranged inside the tail water channel and cooperating with the hoisting member; and a sliding member arranged above the platform and cooperating with the cage.

[0005] In one preferred embodiment of the safe lifting and transferring device for overhauling a tail water channel of a hydropower station, the hoisting member further includes a winch arranged on the side of the connecting frame away from the entrance door, a transmission pulley block mounted on the side of the connecting frame away from the winch, and a steel cable wound around the winch and passing through the transmission pulley block.

[0006] In a preferred embodiment of the safety lifting and transferring device for the maintenance of the tailrace of a hydropower station: the hoisting component further comprises a guide pulley block arranged at the central position of the hanger, a hoisting point pulley installed at the upper end of the hanger, a fall arrestor arranged at the lower side of the hanger, and a traction rope arranged in the fall arrestor. The end of the steel cable away from the winch passes through the transmission pulley block, the guide pulley block, and the hoisting point pulley in sequence, and is connected with the cage.

[0007] In a preferred embodiment of the safety lifting and transferring device for the maintenance of the tailrace of a hydropower station: the cage comprises a basket, an electric control box installed at the front of the basket, universal casters arranged at the bottom of the basket, movable fences connected with the upper ends of the basket through rotating connectors, and fixed fences fixedly arranged between the two movable fences.

[0008] In a preferred embodiment of the safety lifting and transferring device for the maintenance of the tailrace of a hydropower station: the cage further comprises snap rings arranged at the two ends of the fixed fence, the opening width of the snap ring is slightly smaller than the diameter of the rail of the movable fence, and the fixed fence is further provided with a hanging component.

[0009] In a preferred embodiment of the safety lifting and transferring device for the maintenance of the tailrace of a hydropower station: the hanging component comprises a butt joint buckle, the butt joint buckle is sleeved on the rod of the movable fence, an extension rod is arranged at the outer side of the butt joint buckle, a clamping buckle is movably sleeved on the outer side of the extension rod, and a groove is arranged at the end of the extension rod away from the movable fence; the groove cooperates with the steel cable.

[0010] In a preferred embodiment of the safety lifting and transferring device for the maintenance of the tailrace of a hydropower station: the sliding component comprises a mounting plate, fixed guide rails are arranged at the upper ends of the two sides of the mounting plate, rollers are arranged at the inner sides of the fixed guide rails, sliding guide rails are arranged in the fixed guide rails, two groups of sliding wheels are arranged in the sliding guide rails, and the four groups of sliding wheels are fixedly installed at the bottom of the sliding trolley; the mounting plate is fixedly installed on the entrance door through bolts.

[0011] In a preferred embodiment of the safety lifting and transferring device for the maintenance of the tailrace of a hydropower station: the sliding component further comprises a circular groove arranged above the sliding trolley, a rotating disc embedded in the circular groove, a bottom plate fixedly arranged above the rotating disc, positioning points at the top of the bottom plate at the four corners, and a positioning groove at the bottom of the basket; The positioning groove matches the positioning points.

[0012] In a preferred embodiment of the safety lifting and transferring device for maintenance of the tail water channel of a hydropower station, a support is arranged at the end of the two groups of sliding rails away from the entrance door, the lower end of the support is provided with a rail support leg, and the lower end of the rail support leg is provided with an adjustable castor.

[0013] In a preferred embodiment of the use method of the safety lifting and transferring device for maintenance of the tail water channel of a hydropower station, in the personnel carrying stage, the operator in the cage remotely controls the cage to descend at a fast setting, when the bottom of the cage contacts the arc surface of the tail water channel, the slow setting is switched to descend, when the bottom of the cage reaches the bottom of the tail water channel and all the universal castors contact the tail water channel, the hoist is braked, and then the maintenance personnel can enter or exit the cage. In the cargo carrying stage, other operators on site remotely control the cage to descend at a fast setting, when the bottom of the cage contacts the arc surface of the tail water channel, the slow setting is switched to descend, when the bottom of the cage reaches the bottom of the tail water channel and all the universal castors contact the tail water channel, the maintenance personnel can take out the cargo in the cage. In the recovery stage, the cage is manually remotely controlled by the operator in the cage or controlled by other operators on site, and the cage rises to above the sliding rail at a set speed. When the PLC control system is unexpectedly powered off, the electric control system fails, the reduction gear matched with the hoist plays a mechanical self-locking role, the drum in the hoist stops rotating to limit the release of the steel cable, at the same time, the fall arrestor clamps the steel cable to further prevent the cage from sliding downward in the vertical direction, finally, the local personnel lower the cage to the bottom of the tail water channel through the bidirectional manual operation of the tooling, and the emergency disposal is completed.

[0014] The beneficial effects of the present application are that during the installation process of the cage, other special tools are not needed, and the installation personnel do not need to operate outside the entrance door, which greatly reduces the installation operation difficulty and safety risk factors, the sliding rail of the tooling is quickly and conveniently removed, the working efficiency of the installation process and subsequent operation is improved, the whole tooling is simple to manufacture, transport and assemble, and can be flexibly used in various operation sites with relevant needs. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings of the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below only relate to some embodiments of the present application, but not limit the present application.

[0016] Figure 1 The overall structure diagram of the safety lifting and transferring device for maintenance of the tail water channel of a hydropower station is shown.

[0017] Figure 2 The overall structure diagram of the safety lifting and transferring device for maintenance of the tail water channel of a hydropower station from another perspective is shown.

[0018] Figure 3 The specific structure diagram of the lifting part in the safety lifting and transferring device for the maintenance of the tail water channel of the hydropower station is shown.

[0019] Figure 4 The specific structure diagram of the cage in the safety lifting and transferring device for the maintenance of the tail water channel of the hydropower station is shown.

[0020] Figure 5 The specific structure diagram of the hanging part in the safety lifting and transferring device for the maintenance of the tail water channel of the hydropower station is shown.

[0021] Figure 6 The structure diagram of the assembly sliding part of the safety lifting and transferring device for the maintenance of the tail water channel of the hydropower station is shown.

[0022] Figure 7 The overall structure diagram of the sliding part in the safety lifting and transferring device for the maintenance of the tail water channel of the hydropower station is shown.

[0023] Figure 8 The partial structure diagram of the sliding part in the safety lifting and transferring device for the maintenance of the tail water channel of the hydropower station is shown.

[0024] Figure 9 The partial structure diagram of the sliding part in the safety lifting and transferring device for the maintenance of the tail water channel of the hydropower station is shown.

[0025] Fig. 1 is a tail water channel; 11 is an entrance door; 12 is a platform; 2 is a lifting part; 21 is a connecting frame; 22 is a lifting frame; 23 is a winch; 24 is a transmission pulley set; 25 is a steel cable; 26 is a guide pulley set; 27 is a lifting point pulley; 28 is a fall arrestor; 29 is a traction rope; 3 is a cage; 31 is a hanging basket; 32 is an electric control box; 33 is a universal caster; 34 is a movable fence; 35 is a fixed fence; 36 is a snap ring; 37 is a hanging part; 371 is a butt joint buckle; 372 is an extension rod; 373 is a clamping buckle; 374 is a groove; 4 is a sliding part; 41 is a mounting plate; 42 is a fixed guide rail; 43 is a roller; 44 is a sliding guide rail; 45 is a sliding wheel; 46 is a sliding trolley; 47 is a circular groove; 48 is a rotary disc; 49 is a bottom plate; 410 is a positioning point; 411 is a positioning groove; 412 is a support; 413 is a track leg; 414 is an adjusting caster. DETAILED DESCRIPTION

[0026] In order for those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with specific embodiments and drawings.

[0027] The terms used in the present application are those general terms currently widely used in the art in consideration of the functions regarding the present application, but the terms can be changed according to the intention of those of ordinary skill in the art, precedents, or new technology in the art. Also, specific terms can be selected by the applicant, and in this case, the detailed meanings thereof will be described in the detailed description of the present application. Therefore, the terms used in the specification should not be understood as simple names, but based on the meanings of the terms and the general description of the present application.

[0028] Referring to Figure 1 - Figure 2 The embodiment provides a safe lifting and transferring device for overhauling a tail water channel 1 of a hydropower station, comprising the tail water channel 1, an entrance door 1 opened in the outer wall of the tail water channel 1, a platform 12 outside the tail water channel 1, a hoisting part 2 arranged on the platform 12, a connecting frame 21 and a lifting frame 22 arranged on the outer and inner walls of the tail water channel 1 and located on both sides of the entrance door 1, a cage 3 arranged inside the tail water channel 1 and matched with the hoisting part 2, and a sliding part 4 arranged on the platform 12 and matched with the cage 3.

[0029] Further, referring to Figure 3 The connecting frame 21 is arranged on the outer wall of the tail water channel 1 and located on one side of the entrance door 1, the connecting frame 21 is made of high-strength steel material, the connecting frame 21 is in the shape of L type, one end of the connecting frame 21 is fixed on the outer wall of the tail water channel 1 through a plurality of groups of bolts, and the other end of the connecting frame 21 away from the tail water channel 1 is used for installing a transmission pulley set 24 and arranging a winch 23; the winch 23 is selected to be a slow-speed winch 23 with a rated tension ≥ 5 tons, the winch 23 is fixed on the mounting seat of the connecting frame 21 through 4 groups of foundation bolts; a steel cable 25 is wound around the output end of the winch 23, and the start-stop operation and speed adjustment of the winch 23 are realized through a PLC control system, so as to meet the lifting demand of at most 2-3 people and equipment at a time.

[0030] The transmission pulley set 24 is installed on the connecting frame 21, which is composed of a plurality of pulleys of different specifications, and can change the movement direction of the steel cable 25 and realize the labor-saving effect through reasonable arrangement and combination, The steel cable 25 is wound around the winch 23 and passes through the transmission pulley set 24, the steel cable 25 adopts high-strength galvanized steel cable 25 to ensure safety during hoisting. Further, the hanger 22 is welded and fixed to the inner wall of the tail water flow passage 1 through embedded parts. Symmetrically to the connecting frame 21, a guide pulley block 26 is arranged at the central position of the hanger 22, the guide pulley block 26 is composed of multiple guide pulleys, which is used to guide the direction of the steel cable 25, the upper end of the hanger 22 is provided with a lifting point pulley 27, which is used to change the vertical lifting direction of the steel cable 25, so that the steel cable 25 can be connected with the cage 3 from above, the lower side of the hanger 22 is provided with a safety device 28, which is a wedge type quick brake mechanism, one end of a traction rope 29 is wound and connected with the rod body of the cage 3, the other end of the traction rope 29 is wound in the inner core of the safety device 28; during normal operation, the traction rope 29 synchronously stretches and contracts with the lifting movement of the cage 3; when the cage 3 falls due to the breakage of the steel cable 25, the failure of the winch 23 or other reasons, the steel cable 25 rapidly slides down with the cage 3, driving the high-speed rotation of the rope wheel in the safety device 28; when the falling speed of the cage 3 is less than 2m / s, i.e. the normal lifting speed or slight sliding, the rotation speed of the rope wheel is low, the centrifugal force generated by the centrifugal block is small, which is smaller than the preset elastic force of the return spring, the centrifugal block remains in the contracted state and does not push the linkage push rod, so the brake execution assembly does not act; When the falling speed of the cage 3 reaches the brake threshold value, i.e. 2m / s or more, the rotation speed of the rope wheel suddenly increases, the centrifugal force of the centrifugal block also increases synchronously, and exceeds the elastic limit of the return spring, the centrifugal block swings outward away from the center axis of the rope wheel under the action of the centrifugal force, and transmits the movement to the wedge block through the linkage push rod, so as to lock the steel cable 25; The transmission pulley block 24 is installed on the connecting frame 2121, and the power is saved and the direction is changed through a specific pulley combination. It is composed of a fixed pulley and a movable pulley, the fixed pulley can change the direction of the force, and the movable pulley can save the power. When the steel cable 25 is drawn out from the drum of the winch 2323, it first passes through the fixed pulley in the transmission pulley block 24, and the direction of the steel cable 25 is adjusted from the direction of the winch 23 to the direction along the sliding guide rail 44 towards the entrance door 11, which matches the movement path of the horizontal door passing of the cage 3; The main function of the guide pulley block 26 is to ensure that the steel cable 25 moves along the predetermined path, and prevents it from deviating and winding. It is composed of multiple fixed pulleys, during the transmission of the steel cable 25 from the transmission pulley block 24 to the lifting point pulley 27, the first fixed pulley of the guide pulley block 26 receives the steel cable 25 drawn from the transmission pulley block 24, and the second fixed pulley smoothly transitions the steel cable 25 from the horizontal direction to the direction suitable for the lifting point pulley 27, which prepares for the smooth connection of the steel cable 25 with the lifting point pulley 27.

[0031] During the lifting of the cage 3, when the cage 3 is lowered, the steel cable 25 is in the releasing process, the guide pulley block 26 restricts the steel cable 25 to keep in contact with the transmission pulley block 24 and the lifting point pulley 27, preventing the steel cable 25 from being horizontally deviated due to the swing of the cage 3, and ensuring the stability of the vertical lowering of the cage 3. When the cage 3 is lifted, the guide pulley block 26 also ensures the correct direction of the steel cable 25 in the winding process, so that the steel cable 25 can smoothly pass through each pulley and complete the lifting operation of the cage 3; The lifting point pulley 27 is installed on the upper side of the entrance door 11, which is used to change the vertical lifting direction of the steel cable 25. After the cage 3 passes through the door hole and rotates horizontally by 90 degrees, the long side is parallel to the entrance door 11. At this time, the lifting point pulley 27 needs to convert the steel cable 25 from horizontal to vertical direction to realize the vertical lifting control of the cage 3. The lifting point pulley 27 is a fixed pulley structure. When the steel cable 25 passes through the pulley, according to the characteristics of the fixed pulley changing the force direction, the 90-degree change of the direction of the steel cable 25 is realized. When the steel cable 25 extends from the guide pulley block 26 to the lifting point pulley 27, the direction changes from horizontal to vertical downward after passing through the pulley. The steel cable 25 is connected to the hanging point of the cage 3 through the fall arrestor 28. When the cage 3 is lifted, the steel cable 25 is affected by the winding force of the winch 23, and is converted from the vertical direction to the horizontal direction or other suitable direction of the guide pulley block 26 through the lifting point pulley 27, which ensures the circular motion of the steel cable 25 and completes the lifting operation of the cage 3, ensuring the safe and stable operation of the cage 3 in the vertical direction. Referring to Figure 4 The cage 3 includes a basket 31. The size of the basket 31 is designed according to actual needs. In this embodiment, the size of the basket 31 is 1340mm*640mm*700mm. The basket 31 must pass through the entrance door 1 and the hole with the corresponding position and size on the draft tube 1 according to the cross section of 640mm*700mm. The cage 3 can accommodate two maintenance personnel and necessary maintenance tools and equipment. The electric control box 32 is installed on the front side of the basket 31. Various control circuits and elements are integrated in the electric control box 32, which is used to control the lifting speed, braking and other operations of the cage 3. The electric control box 32 is equipped with a wireless remote control receiving device, which can receive signals from the remote controller of the operator to realize remote control. At the same time, the electric control box 32 also has various safety protection mechanisms such as overload protection and short circuit protection. When abnormal conditions occur, such as overload of the personnel in the basket 31, total load of the basket 31 breaking the preset overload threshold of the electric control box 32, or the basket 31 accidentally touching the damaged member in the draft tube during the lowering of the cage 3 to the bottom of the draft tube 11, causing the lifting of the cage 3 to be blocked, the load of the winch 23 instantaneously increases and exceeds the safety load range set by the electric control box 32, the electric control box 32 can automatically cut off the power supply to protect the equipment and personnel safety. The bottom side of the basket 31 is provided with universal casters 33, which facilitate the movement of the basket 31. When the bottom of the cage 3 is lowered to the bottom of the draft tube 1, the universal casters 33 can be in contact with the bottom of the draft tube 1, thereby providing stable support. The movable fences 34 are connected to the upper sides of the basket 31 through rotating shafts. The movable fences 34 are made of stainless steel and can effectively prevent people from falling from the basket 31. The movable fences 34 can improve the safety of the basket 31 and facilitate the storage of the basket 31. The two movable fences 34 are overlapped by rotating relative to each other, thereby achieving the storage effect. The fixed fence 35 is movably arranged between the two movable fences 34. The upper and lower sides of the two ends of the fixed fence 35 are each provided with a snap ring 36. The opening width of the snap ring 36 is slightly smaller than the diameter of the fence of the movable fence 34. The snap ring 36 is made of elastic material. When the snap ring 36 is sleeved on the rod body, a continuous radial clamping force is generated, thereby preventing loosening. When it is necessary to fix the vertical position of the two movable fences 34, the snap ring 36 can be sleeved on the rod body of the movable fence 34 by force. The two movable fences 34 can form a horizontal supporting force therebetween, thereby enhancing the stability of the overall structure. Referring to Figure 5 , the fixed fence 35 is further provided with a hanging piece 37. The hanging piece 37 includes a butt joint buckle 371, which is sleeved on the rod body of the fixed fence 35 and is fastened by a bolt. An extension rod 372 is arranged on the outer side of the butt joint buckle 371. The main buckle of the clamping buckle 373 is fixedly sleeved on the outer side of the extension rod 372. The auxiliary buckle of the clamping buckle 373 is fastened with the main buckle by a bolt. The inner side of the auxiliary buckle is in contact with one end of the extension rod 372. A groove 374 is formed on the surface of the other end of the extension rod 372. The groove 374 cooperates with the steel cable 25. When the steel cable 25 is placed in the groove 374, the steel cable 25 is fixed by the clamping buckle 373, thereby ensuring the reliable connection between the cage 3 and the steel cable 25. Referring to Figure 6 - Figure 9 The sliding member 4 includes a mounting plate 41, which is fixedly installed on the entrance door 1 by a bolt. The upper ends of the two sides of the mounting plate 41 are provided with fixed guide rails 42. Rollers 43 are arranged on the inner sides of the fixed guide rails 42. Sliding guide rails 44 are adapted to the fixed guide rails 42. Two groups of sliding wheels 45 are arranged in the sliding guide rails 44. Four groups of sliding wheels 45 are fixedly installed with a sliding trolley 46.

[0032] Further, the inner side of the fixed guide rail 42 is provided with a roller 43. The roller 43 can reduce the friction of the sliding guide rail 44 during sliding, thereby making the operation smoother. The shape of the sliding guide rail 44 matches the fixed guide rail 42. The sliding trolley 46 is used to carry the cage 3 and move horizontally on the sliding guide rail 44.

[0033] Further, the sliding trolley 46 is provided with a circular groove 4747, and a rotating disc 48 is embedded in the circular groove 4747 and can rotate freely in the circular groove 4747. A bottom plate 49 is fixedly arranged on the rotating disc 48, and a positioning point 410 is arranged at the upper portion of the bottom plate 49 at the four corner positions and is a square protrusion. A positioning groove 411 of the bottom of the hanging basket 31 matches the positioning point 410. When the hanging basket 3 is placed on the sliding trolley 46, the positioning point 410 can be inserted into the positioning groove 411, so that the installation and positioning of the hanging basket 3 are realized, the displacement of the hanging basket 3 in the transfer process is prevented, and the horizontal rotation of the hanging basket 3 on the sliding guide rail 44 is realized through the rotating disc 48 and the circular groove 4747.

[0034] The two groups of sliding guide rails 44 are provided with a support 412 close to the other end thereof, the lower end of the support 412 is provided with a track support leg 413, the lower end of the track support leg 413 is provided with an adjustable caster 414, the adjustable caster 414 has a brake function, a brake pedal and a brake block are arranged on the side of the wheel frame of the adjustable caster 414, the brake pedal is hingedly connected to the wheel frame through a pin shaft, the brake block is made of high-friction rubber, and the brake block is fixed to the inner side of the pedal. Corresponding to the position of the rim of the universal wheel, the operating personnel steps down the brake pedal, the pedal rotates around the pin shaft, drives the brake block to tightly press the side surface of the rim of the universal wheel, and the friction force between the rubber and the metal rim prevents the rotation of the wheel. The brake pedal is pulled upward, the buckle protrusion is separated from the positioning groove 411, the brake block is separated from the rim, and the adjustable caster 414 restores the free rotation. When the sliding trolley 46 reaches the specified position, the sliding trolley 46 can be fixed by the brake to prevent the movement of the sliding trolley 46.

[0035] In an embodiment provided by the application, an operation method for transferring the hanging basket 3 from the platform 12 into the tail water flow channel 1 is provided. Firstly, the mounting plate 41 is fixed on the flange plate of the entrance door 1, then the sliding guide rail 44 is inserted into the fixed guide rail 42, the support leg is installed to make the track horizontal, then the sliding trolley 46 is inserted into the C-shaped track groove of the sliding guide rail 44, and finally the hanging basket 3 is lifted and placed on the sliding trolley 46 by the installation personnel, and the four positioning points 410 limit and fix the hanging basket 3.

[0036] The hanging basket 3 must pass through the hole of the entrance door 1 in a cross section of 640mm*700mm, that is, the hanging basket 3 is in a folded state, and then the hanging basket 3 is horizontally rotated by 90 degrees in the space outside the door, so that the two side clamping buckles 373 are located directly below the hanging point pulley 27.

[0037] The specific steps are as follows: the locking state of the adjusting caster wheel 414 is released, the cage 3 is pushed into the entrance door 1 of the tail water flow channel 1 along with the sliding guide rail 44, until the adjusting caster wheel 414 stably abuts against the outer wall of the tail water flow channel 1, so that the initial position of the sliding guide rail 44 is fixed, then the cage 3 and the sliding trolley 46 continue to be pushed along the sliding guide rail 44 through the entrance door 1, until the sliding wheel 45 below the sliding trolley 46 contacts the inner wall of the outermost end of the sliding guide rail 44, so that the cage 3 is completely inside the tail water flow channel 1, then the cage 3 is horizontally rotated by 90 degrees, so that the long side of the cage 31 is parallel to the entrance door 1, at this time, the posture of the cage 3 is suitable for lifting requirements. Finally, the installer horizontally pulls the cage 3 inward, so that the two ends of the cage 3 are accurately aligned vertically below the hoisting point pulley 27; the hoist 23 is started, the steel cable 25 is gradually tightened, the bottom of the cage 3 is lifted to a height of about 100 mm from the sliding trolley 46, so that the cage 3 is completely separated from the positioning point 410; then the sliding guide rail 44 is pulled back outside the entrance door 1 hole to avoid interfering with the lifting of the cage 3; the hoist 23 is started again, and the steel cable 25 controls the cage 3 to stably fall to the specified position below the entrance door 1 hole, thereby completing the installation of the cage 3.

[0038] In an embodiment provided by the present application, a use method of a safe lifting and transferring device for overhauling a tail water flow channel 1 of a hydropower station is provided; the use method comprises the following steps: In the manned stage, the operator in the cage 3 remotely controls the cage 3 to descend at a fast speed, and when the bottom of the cage 3 contacts the arc surface of the tail water flow channel 1, the speed is switched to slow, and when the bottom of the cage 3 reaches the bottom of the tail water flow channel 1 and the universal casters all contact the tail water flow channel 1, the hoist is braked, and then the maintenance personnel can enter and exit the cage 3; In the cargo carrying stage, other operators on the scene remotely control the cage 3 to descend at a fast speed, and when the bottom of the cage 3 contacts the arc surface of the tail water flow channel 1, the speed is switched to slow, and when the bottom of the cage 3 reaches the bottom of the tail water flow channel 1 and the universal casters 33 all contact the tail water flow channel 1, the maintenance personnel can take out the cargo in the cage 3; In the recovery stage, the cage 3 is manually remotely controlled by the operator in the cage 3 or controlled by other operators on the scene, and the cage 3 rises to above the sliding guide rail 44 at a set speed; When the PLC control system is unexpectedly powered off, the electric control system fails, the reduction gear matched with the hoist 23 plays a mechanical self-locking role, the drum in the hoist 23 is immediately stopped to limit the release of the steel cable 25, at the same time, the fall protector 28 clamps the steel cable to further prevent the cage 3 from sliding downward in the vertical direction, and finally the local personnel lower the cage 3 to the bottom of the tail water flow channel 1 through the bidirectional manual operation of the tooling, and the emergency disposal is completed.

[0039] In the manned stage, the cage 3 is set to descend at a speed of 10 m / min, which can ensure efficient arrival at the work area and the comfort and safety of personnel in the cage 3. When the cage 3 contacts the tail water flow channel 1 arc surface, slow descent is switched to, and the slow descent speed is set to 5 m / min. The tail water flow channel 1 arc surface structure is complex, and if the speed is too fast, the cage 3 and the flow channel will collide.

[0040] In the cargo carrying stage, the cage 3 is set to descend at a speed of 10 m / min to improve the efficiency of cargo transportation. When contacting the tail water flow channel 1 arc surface, the slow descent speed of 5 m / min is switched to, which is the same as in the manned stage. The reason is that the placement of goods in the cage 3 is different, and high speed through the arc surface may cause the goods to shift or even fall. After the universal wheel 33 is fully in contact with the bottom of the tail water flow channel 1, the cage 3 is stable, and the maintenance personnel can safely take out the goods; The speed setting in the recovery stage: in the recovery stage, the cage 3 ascends at a set speed, and the ascending speed is set to

[15] m / min, which can ensure rapid recovery of the cage 3 and avoid excessive inertia force caused by excessive speed, which may damage the equipment.

[0041] In the normal manned, cargo carrying and recovery stages, when the cage 3 reaches the specified position, such as the bottom of the tail water flow channel 1 in the manned and cargo carrying stages, and the universal wheel 33 is fully in contact with the tail water flow channel 1, or the recovery stage reaches the predetermined recovery height, the operator sends a braking instruction through the electric control box 32. After the control circuit in the electric control box 32 receives the instruction, it quickly transmits the signal to the brake system of the hoist 23. The brake system of the hoist 23 stops the rotation of the drum of the hoist 23 through the electromagnetic clutch, thereby braking the steel cable 25 and stopping the movement of the cage 3; For example, in the manned stage, when the cage 3 reaches the bottom of the tail water flow channel 1, the operator presses the brake button on the remote controller, and the wireless remote control receiving device in the electric control box 32 receives the signal, processes it through the circuit, and transmits the brake signal to the electromagnetic clutch of the hoist 23. The electromagnetic clutch is de-energized, the drum is separated from the drive motor, and the mechanical brake device is clamped to the drum to achieve braking.

[0042] Power failure emergency brake logic: When the PLC control system is unexpectedly powered off, the standby power supply, UPS, immediately starts to supply power to the fall arrestor 28 and related brake control circuit. The fall arrestor 28 detects the abnormal rapid descent of the steel cable 25, and when the cage 3 falls at a speed of ≥ 2 m / s to reach the brake threshold, the centrifugal block inside the fall arrestor 28 is thrown away from the center axis of the rope wheel under the action of centrifugal force, and the movement is transmitted to the wedge block through the linkage push rod. The wedge block quickly acts to lock the steel cable 25, preventing the cage 3 from continuing to fall. At the same time, local personnel can use the power provided by the standby power supply to control the winch 23 to slowly lower the cage 3 to the bottom of the tailrace 1 by manually operating the device. For example, when the power suddenly goes out, the UPS power supply instantly supplies power to the fall arrestor 28 and the manual operation control circuit, and the fall arrestor 28 quickly brakes after detecting the abnormal speed of the steel cable 25. After the local personnel discover the power failure, they go to the manual operation device and control the brake and operation of the winch 23 by operating the handle to safely lower the cage 3 to the bottom of the tailrace 1.

[0043] Finally, it should be noted that the methods and devices described in detail above are only embodiments, and those skilled in the art can modify these embodiments in different ways without departing from the scope of the present application.

Claims

1. A safe lifting and transferring device for maintenance of the tailrace channel of a hydropower station, characterized in that: include, The tailwater channel (1) includes an entrance door (11) installed on the outer wall of the tailwater channel (1) and a platform (12) disposed outside the tailwater channel (1). The hoisting component (2) is set above the platform (12). The hoisting component (2) includes a connecting frame (21) and a hanger (22) connected to each other. The connecting frame (21) and the hanger (22) are respectively located on both sides of the entrance door (11). A cage (3) is installed inside the tailwater channel (1) and cooperates with the hoisting component (2); A sliding member (4) is disposed above the platform (12) and used in conjunction with the cage (3).

2. The safety lifting and transferring device for maintenance of the tailrace channel of a hydropower station according to claim 1, characterized in that: The hoisting component (2) also includes a winch (23) disposed on the side of the connecting frame (21) away from the entrance door (11), a transmission pulley block (24) installed on the side of the connecting frame (21) away from the winch (23), and a steel cable (25) wound around the winch (23) and passing through the transmission pulley block (24).

3. A safety lifting and transferring device for maintenance of the tailrace channel of a hydropower station according to claim 2, characterized in that: The hoisting component (2) also includes a guide pulley group (26) located at the center of the hoist (22), a lifting point pulley (27) installed at the upper end of the hoist (22), a fall arrester (28) located on the lower side of the hoist (22), and a traction rope (29) installed in the fall arrester (28). The end of the steel cable (25) away from the winch (23) passes through the transmission pulley group (24), the guide pulley group (26) and the lifting point pulley (27) in sequence, and then connects to the cage (3).

4. A safety lifting and transferring device for maintenance of the tailrace channel of a hydropower station according to claim 3, characterized in that: The cage (3) includes a basket (31), an electrical control box (32) installed in front of the basket (31), swivel casters (33) at the bottom of the basket (31), movable railings (34) connected to the upper sides of the basket (31) by a rotating connector, and fixed railings (35) fixedly installed between the two sets of movable railings (34).

5. A safety lifting and transferring device for maintenance of the tailrace channel of a hydropower station according to claim 4, characterized in that: The cage (3) also includes retaining rings (36) respectively set at both ends of the fixed fence (35). The opening width of the retaining rings (36) is slightly smaller than the diameter of the railing of the movable fence (34), and the fixed fence (35) is also provided with hanging parts (37).

6. A safety lifting and transferring device for maintenance of the tailrace channel of a hydropower station according to claim 5, characterized in that: The hanging component (37) includes a hook (371) which is sleeved on the pole of the movable fence (34), an extension rod (372) provided outside the hook (371), a clamping buckle (373) movably sleeved outside the extension rod (372), and a groove (374) opened at the end of the extension rod (372) away from the movable fence (34). The groove (374) is fitted with the steel cable (25).

7. A safety lifting and transferring device for maintenance of the tailrace channel of a hydropower station according to claim 6, characterized in that: The sliding component (4) includes a mounting plate (41), fixed guide rails (42) are provided on both sides of the upper end of the mounting plate (41), rollers (43) are provided inside the fixed guide rails (42), and sliding guide rails (44) are provided inside the fixed guide rails (42). Two sets of sliding wheels (45) are provided inside the sliding guide rails (44), and the four sets of sliding wheels (45) are fixedly installed at the bottom of the sliding trolley (46). The mounting plate (41) is fixedly mounted on the entrance door (11) by bolts.

8. A safety lifting and transferring device for maintenance of the tailrace channel of a hydropower station according to claim 7, characterized in that: The sliding component (4) also includes a circular groove (47) opened above the sliding trolley (46), a turntable (48) embedded in the circular groove (47), a base plate (49) fixedly set above the turntable (48), positioning points (410) at the four corners of the top of the base plate (49), and positioning grooves (411) at the bottom of the hanging basket (31). The positioning groove (411) matches the positioning point (410).

9. A safety lifting and transferring device for maintenance of the tailrace channel of a hydropower station according to claim 8, characterized in that: A bracket (412) is provided at the end of the two sets of sliding guide rails (44) away from the entrance door (11). The lower end of the bracket (412) is provided with a track support leg (413), and the lower end of the track support leg (413) is provided with an adjustable caster (414).

10. A method for using a safety lifting and transferring device for maintenance of the tailrace channel of a hydropower station, characterized in that: A safety lifting and transferring device for maintenance of the tailrace channel of a hydropower station, as described in any one of claims 1 to 9, comprising: During the manned phase, the operator inside the cage (3) remotely controls the cage (3) to descend quickly. When the bottom of the cage (3) contacts the arc surface of the tailwater channel (1), the slow setting is switched to descend. When the bottom of the cage (3) reaches the bottom of the tailwater channel (1) and all the casters are in contact with the tailwater channel (1), the hoisting mechanism is braked, and maintenance personnel can enter and exit the cage (3). During the loading phase, other operators on site remotely control the cage (3) to descend at a fast speed. When the bottom of the cage (3) contacts the arc surface of the tailwater channel (1), the slow speed setting is switched to descend. When the bottom of the cage (3) reaches the bottom of the tailwater channel (1) and all the casters (33) are in contact with the tailwater channel (1), the maintenance personnel can take out the cargo inside the cage (3). During the recovery phase, the hoist cage (3) is manually remotely controlled by the operator inside the cage (3) or controlled by other operators on site. The cage (3) rises to the top of the sliding guide rail (44) at the set speed. When the PLC control system loses power unexpectedly, the electrical control system fails. The reducer of the winch (23) plays a mechanical self-locking role, and the drum inside the winch (23) stops rotating to limit the release of the steel cable (25). At the same time, the fall arrestor (28) clamps the steel cable to further prevent the cage (3) from sliding down in the vertical direction. Finally, local personnel use bidirectional manual operation of the tooling to lower the cage (3) to the bottom of the tailwater channel (1) to complete the emergency response.

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