An internally extending electric platform for nuclear power plant construction hoists

Abstract

This invention relates to the field of nuclear power engineering technology and proposes an inward-extending electric platform for nuclear power engineering construction hoists. The platform includes a support frame for supporting the ladder body and lifting components. The ladder body includes a connecting ladder and an arc-shaped guardrail, and is fixed to the support frame via the connecting ladder. Through the design of angle deflectors, telescopic components, and other structures, two sets of cross-over angle deflectors utilize worm gear motors to drive a transmission worm and a transmission worm wheel, which in turn drive an angle rotation plate via a universal drive shaft and a connecting plate to achieve stepless leveling of the dual axes. Simultaneously, the servo motor of the telescopic component drives a first sliding plate via a transmission gear set, and then a transmission chain synchronously drives a second sliding plate to smoothly extend inward. The standing plate quickly and accurately reaches the working position, shortening the posture adjustment and alignment time, significantly improving the efficiency of inward-extending operations, and solving the problems of insufficient efficiency and safety in existing technologies.

Description

Technical Field

[0001] This invention relates to the field of nuclear power engineering technology, specifically to an inward-extending electric platform for a nuclear power engineering construction hoist. Background Technology

[0002] In nuclear power plant construction, extended-lift electric platforms are used to horizontally transport workers from the elevator compartment to the internal working surfaces of structures such as the reactor building and containment vessel, bridging the gaps between the elevator and the structures. Currently available extended-lift electric platforms typically use conventional guide rails and drive units for vertical displacement, but their angle adjustment methods are relatively simple, usually relying on a simple hinge between the platform and the lifting carriage, with single-axis tilt adjustment achieved manually or hydraulically. This structure cannot achieve independent and precise leveling of the platform along two intersecting axes when facing the complex curved walls, variable cross-section shafts, or inclined equipment surfaces inside nuclear power plants. This results in gaps or staggered surfaces where the standing platform cannot properly align with the target working surface, increasing the risks for personnel passage and material handling.

[0003] Regarding the telescopic mechanism, existing inward-extending platforms mostly employ multi-stage hydraulic cylinder direct push or single-stage rack and pinion drive structures. Hydraulic cylinder solutions are prone to asynchronous movement and creeping under eccentric load conditions, while single-stage rack and pinion telescopic systems can only achieve a short translation, failing to achieve a large inward extension stroke within a compact space, thus affecting the platform's ability to adapt to different clearances. Furthermore, existing technologies lack closed-loop attitude detection linked to angle adjustment. When the platform is subjected to interference from wind, eccentric load, etc., during lifting and lowering, the tilt state cannot be compensated for in real time, requiring operators to repeatedly make manual corrections, resulting in low efficiency and insufficient safety margin.

[0004] In terms of safety, existing platforms typically only have fixed railings around the standing platform. When the platform extends inward, a gap is formed between the guardrails and the elevator body, posing a risk of people falling. Furthermore, the angle adjustment actuators are mostly ordinary motor-driven lead screws or hydraulic cylinders, lacking self-locking characteristics. Maintaining the angle for extended periods may lead to drift due to leakage or vibration. Summary of the Invention

[0005] This invention proposes an internally extending electric platform for nuclear power engineering construction hoists, which solves the problems of insufficient efficiency and safety in related technologies.

[0006] The technical solution of the present invention is as follows: an internally extending electric platform for a nuclear power engineering construction hoist, including a support frame for supporting the ladder body and the lifting assembly; The ladder body includes a connecting ladder and an arc-shaped guardrail, and the ladder body is fixed to the support frame by the connecting ladder; A lifting assembly includes a lifter, a guide rail, a sliding block, and a lifting plate, wherein the sliding block slides along the guide rail to drive the lifting plate to move up and down. The angle deflection assembly consists of two overlapping angle deflection components. Each angle deflection assembly includes two symmetrically arranged angle deflectors. Each angle deflector includes a mounting frame, a worm motor, a transmission worm, a transmission worm wheel, a universal drive shaft, a sleeve block, a fixing plate, a double-end hinge block, and a connecting plate. The angle deflector is fixed to the lifting plate by the mounting frame and drives the lifting plate to rotate at an angle via the worm motor, transmission worm, transmission worm wheel, and universal drive shaft. The angle deflection assembly also includes an auxiliary device, which includes a telescopic cylinder and a hinge shaft, to assist the angle deflector in completing angle adjustment. The angle deflection assembly also includes a tilt sensor and an angle rotation plate, to detect the tilt angle of the lifting plate and feed back a signal to the control system. The telescopic assembly includes a telescopic mounting plate, a servo motor, a transmission gear set, a first sliding plate, a transmission chain, a second sliding plate, a standing plate, and a second side railing. The telescopic assembly is used to adjust the horizontal position of the standing plate. The first sliding plate and the second sliding plate are connected by a transmission chain and driven by the servo motor and the transmission gear set.

[0007] In a preferred embodiment of the present invention, two overlapping angle deflection components cooperate with each other through a lifting plate to achieve angle adjustment of the lifting plate during the lifting process.

[0008] In a preferred embodiment of the present invention, two symmetrically arranged angle deflectors are connected to a connecting plate via a universal drive shaft to achieve a balanced distribution of rotational torque.

[0009] In a preferred embodiment of the present invention, one end of the telescopic cylinder of the auxiliary device is fixed to the mounting frame, and the other end is hinged to the lifting plate via a hinge shaft, which is used to realize the telescopic adjustment of the angle deflection component.

[0010] In a preferred embodiment of the present invention, the tilt sensor is fixed to the angle rotation plate to detect changes in the tilt angle of the lifting plate and to feed the detection signal back to the control system to control the action of the angle deflection component.

[0011] In a preferred embodiment of the present invention, the sliding block in the lifting assembly cooperates with the guide rail to make the lifting plate rise and fall smoothly along the guide rail.

[0012] In a preferred embodiment of the present invention, the first sliding plate and the second sliding plate of the telescopic assembly are connected by a transmission chain, and the servo motor drives the transmission gear set to achieve synchronous telescopic movement.

[0013] In a preferred embodiment of the present invention, the standing plate is fixed to the second sliding plate, and the height and horizontal position are adjusted by a telescopic component.

[0014] In a preferred embodiment of the present invention, a first side railing is disposed on the top of the support frame, a second side railing is disposed on the top of the standing plate, and the arc-shaped guardrail is connected to the ladder body to ensure safe use.

[0015] In a preferred embodiment of the present invention, the worm motor, transmission worm, transmission worm wheel and universal drive shaft of the angle deflector constitute a transmission system for realizing the angle control of the lifting plate.

[0016] The working principle and beneficial effects of this invention are as follows: 1. This invention, through the design of angle deflectors, telescopic components, and other structures, utilizes two sets of cross-over superimposed angle deflectors to drive the transmission worm and transmission worm wheel through the worm motor inside the angle deflector. This drives the angle rotating plate via a universal drive shaft and connecting plate to achieve dual-axis stepless leveling. At the same time, the servo motor of the telescopic component drives the first sliding plate through the transmission gear set, and then the transmission chain synchronously drives the second sliding plate to extend smoothly inward. The standing plate quickly and accurately reaches the working position, shortening the posture adjustment and alignment time and significantly improving the efficiency of inward extension operations.

[0017] 2. This invention, through the setting of structures such as the first side railing and the arc-shaped guardrail, forms a continuous fall protection boundary with the second side railing on the telescopic component after it extends into the platform. Personnel are protected throughout the entire process from the ladder body through the connecting ladder to the standing board. At the same time, the tilt sensor provides real-time feedback of attitude signals, which, together with the transmission self-locking characteristics of the worm gear pair in the angle deflector, maintains rigid locking at any angle, eliminating the risk of off-center slippage and falls, and ensuring the safety of high-altitude construction. Attached Figure Description

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall transmission structure of the present invention; Figure 3 This is a bottom view of the overall transmission structure of the present invention; Figure 4 This is a schematic diagram of the overall structure of the angle deflection component of the present invention; Figure 5 This is a schematic diagram of the transmission structure of the angle deflection component of the present invention; Figure 6 This is a schematic diagram of the sleeve block transmission structure of the present invention; Figure 7 This is a schematic diagram of the overall structure of the telescopic component of the present invention.

[0020] In the diagram: 1. Support frame; 12. First side railing; 2. Ladder body; 21. Connecting ladder; 22. Curved guardrail; 3. Lifting assembly; 31. Lifter; 32. Guide rail; 33. Sliding block; 34. Lifting plate; 4. Angle deflection assembly; 41. Angle deflector; 411. Mounting frame; 412. Worm motor; 413. Transmission worm; 414. Transmission worm wheel; 415. Universal drive shaft; 416. Sleeve block; 417. Fixing plate; 418. Double-end hinge block; 419. Connecting plate; 42. Auxiliary device; 421. Telescopic cylinder; 422. Hinge shaft; 43. Tilt sensor; 44. Angle rotation plate; 5. Telescopic assembly; 51. Telescopic mounting plate; 52. Servo motor; 53. Transmission gear set; 54. First sliding plate; 55. Transmission chain; 56. Second sliding plate; 57. Standing plate; 58. Second side railing. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0022] Example like Figures 1-7 As shown, an internally extending electric platform for a nuclear power engineering construction hoist includes a support frame 1 for supporting the ladder body 2 and the lifting assembly 3. The ladder body 2 includes a connecting ladder 21 and an arc-shaped guardrail 22. The ladder body 2 is fixed to the support frame 1 by connecting the ladder 21. The lifting assembly 3 includes a lifter 31, a guide rail 32, a sliding block 33, and a lifting plate 34. The sliding block 33 slides along the guide rail 32 to drive the lifting plate 34 to move up and down. Angle deflection assembly 4 consists of two overlapping angle deflection assemblies 4. Each angle deflection assembly 4 includes two symmetrically arranged angle deflectors 41. Each angle deflector 41 includes a mounting frame 411, a worm motor 412, a transmission worm 413, a transmission worm wheel 414, a universal drive shaft 415, a sleeve block 416, a fixing plate 417, a double-end hinge block 418, and a connecting plate 419. The angle deflectors 41 are fixed to the lifting plate 34 by the mounting frame 411 and drive the lifting plate 34 to rotate at an angle through the worm motor 412, the transmission worm 413, the transmission worm wheel 414, and the universal drive shaft 415. The angle deflection assembly 4 also includes an auxiliary device 42, which includes a telescopic cylinder 421 and a hinge shaft 422, used to assist the angle deflectors 41 in completing angle adjustment. The angle deflection assembly 4 also includes a tilt sensor 43 and an angle rotation plate 44, used to detect the tilt angle of the lifting plate 34 and feed back a signal to the control system. The telescopic assembly 5 includes a telescopic mounting plate 51, a servo motor 52, a transmission gear set 53, a first sliding plate 54, a transmission chain 55, a second sliding plate 56, a standing plate 57, and a second side railing 58. The telescopic assembly 5 is used to adjust the horizontal position of the standing plate 57. The first sliding plate 54 and the second sliding plate 56 are connected by the transmission chain 55 and are driven by the servo motor 52 and the transmission gear set 53.

[0023] An internally extending electric platform for a nuclear power plant construction hoist is provided, comprising a support frame 1, a ladder body 2, a lifting assembly 3, an angle deflection assembly 4, and a telescopic assembly 5. The support frame 1 is bolted to the main structure of the hoist, and the ladder body 2 is welded to the support frame 1 via a connecting ladder 21. An arc-shaped guardrail 22 extends along the outer side of the ladder for protection. The lifting assembly 3's lifting device 31 is an electric winch that drives a sliding block 33 to slide vertically along a guide rail 32. The sliding block 33 is fixed to the lifting plate 34 by bolts. The angle deflection assembly 4 is arranged in two overlapping sets, each set containing two symmetrically installed angle deflectors 41. The mounting frame 411 of the angle deflector 41 is screwed to the lifting plate 34. The worm motor 412 rotates to drive the transmission worm 413, which meshes with the transmission worm wheel 414. The transmission is then transmitted to the connecting plate 419 via the universal drive shaft 415, the sleeve block 416, the fixing plate 417, and the double-end hinge block 418. The connecting plate 419 hinges and drives the movable part of the lifting plate 34 to rotate at an angle. The telescopic cylinder 421 of the auxiliary device 42 has its cylinder body fixed to the mounting frame 411, and its piston rod is hinged to the lifting plate 34 via the hinge shaft 422. The tilt sensor 43 is attached to the angle rotation plate 44 to detect the tilt angle in real time and provide feedback to the control system. The telescopic mounting plate 51 of the telescopic assembly 5 is fixed to the upper angle rotation plate 44. The servo motor 52 drives the first sliding plate 54 through the transmission gear set 53. The transmission chain 55 connects the second sliding plate 56 to extend and retract synchronously. The standing plate 57 and the second side railing 58 extend horizontally inward to the working position.

[0024] The two overlapping angle deflection components 4 cooperate with each other through the lifting plate 34 to achieve angle adjustment of the lifting plate 34 during the lifting process.

[0025] Two angle deflection components 4 are stacked and interlocked to achieve precise angle adjustment of the lifting plate 34. The support frame 1 fixes the ladder body 2, and the lifting component 3 drives the lifting plate 34 to move along the guide rail 32. The lower angle deflection component 4 is fixed to the base of the lifting plate 34 by the mounting frame 411. The worm motors 412 of its two angle deflectors 41 synchronously drive the transmission worm 413 and the transmission worm wheel 414. Through the universal drive shaft 415, the sleeve block 416, the fixing plate 417, the double-end hinge block 418, and the connecting plate 419, the first angle rotating plate 44 is driven to deflect around the front and rear axis. The mounting frame 411 of the upper angle deflection component 4 is fixed to the first angle rotating plate 44, and its connecting plate 419 drives the second angle rotating plate 44 to deflect around the left and right axis. The tilt sensor 43 is fixed to the second angle rotating plate 44 and sends a signal to the control system during the lifting process. The control system adjusts the rotation angle of the two sets of worm motors 412 respectively. The telescopic cylinder 421 of the auxiliary device 42 cooperates in pushing and pulling. The telescopic mounting plate 51 of the telescopic component 5 is connected to the second angle rotating plate 44. The servo motor 52 drives the first sliding plate 54 and the second sliding plate 56 through the transmission gear set 53 and the transmission chain 55, so that the standing plate 57 and the second side railing 58 extend.

[0026] Two symmetrically arranged angle deflectors 41 are connected to the connecting plate 419 via a universal drive shaft 415 to achieve a balanced distribution of rotational torque.

[0027] The internally extending electric platform of the nuclear power plant construction hoist includes a support frame 1, a ladder body 2, a lifting assembly 3, an angle deflection assembly 4, and a telescopic assembly 5. Two symmetrically arranged angle deflectors 41 in the angle deflection assembly 4 achieve balanced torque distribution. The left and right angle deflectors 41 have identical structures, and their mounting frames 411 are fixed to both sides of the base of the lifting plate 34. Two worm gear motors 412 operate synchronously, each driving a transmission worm 413 to mesh with a transmission worm wheel 414. The worm wheel shaft hole connects to a universal drive shaft 415, which passes through a bearing seat composed of a fixed plate 417 and a sleeve block 416, and its end connects to a double-ended hinge block 418. The ear plates on both sides of the double-ended hinge block 418 are hinged to a connecting plate 419 via pins, and the connecting plate 419 is then bolted to the angle rotation plate 44. The transmission paths on both sides are symmetrical, and the universal drive shaft 415 allows for changes in the transmission angle, ensuring that torque is evenly transmitted to the angle rotation plate 44. The tilt sensor 43 is fixed to the angle rotation plate 44. The telescopic cylinder 421 of the auxiliary device 42 is hinged to the mounting frame 411 at one end and to the lifting plate 34 at the other end. The lifting device 31 of the lifting assembly 3 drives the sliding block 33 to rise and fall along the guide rail 32. The servo motor 52 of the telescopic assembly 5 drives the first sliding plate 54 and the second sliding plate 56 to extend inward synchronously through the transmission gear set 53 and the transmission chain 55, so that the standing plate 57 and the side railing reach the working position.

[0028] One end of the telescopic cylinder 421 of the auxiliary device 42 is fixed to the mounting frame 411, and the other end is hinged to the lifting plate 34 through the hinge shaft 422, which is used to realize the telescopic adjustment of the angle deflection component 4.

[0029] The auxiliary device 42 participates in angle deflection adjustment. The support frame 1 fixes the ladder body 2, and the sliding block 33 in the guide rail 32 of the lifting assembly 3 connects to the lifting plate 34. The mounting frame 411 of the angle deflection assembly 4 is fixed to the lifting plate 34. Its built-in angle deflector 41 consists of a worm motor 412, a transmission worm 413, a transmission worm wheel 414, a universal drive shaft 415, a sleeve block 416, a fixing plate 417, a double-end hinge block 418, and a connecting plate 419. The connecting plate 419 hinges to drive the angle rotation plate 44. The tail of the telescopic cylinder 421 of the auxiliary device 42 is fixed to the mounting frame 411 by a pin. The piston rod end is equipped with a hinge shaft 422, which is inserted into the hinge seat hole of the movable part of the lifting plate 34. The control system issues a command based on the feedback from the tilt sensor 43. The hydraulic valve group supplies oil to the telescopic cylinder 421, and the cylinder actively extends and retracts, cooperating with the worm gear transmission system to complete the angle adjustment; the cylinder locks during the angle holding stage. The telescopic mounting plate 51 of the telescopic component 5 is located on the angle rotating plate 44. The servo motor 52 drives the first sliding plate 54 through the transmission gear set 53, and the second sliding plate 56 is linked through the transmission chain 55, so that the standing plate 57 and the second side railing 58 extend inward smoothly.

[0030] The tilt sensor 43 is fixed to the angle rotation plate 44 and is used to detect the tilt angle change of the lifting plate 34 and feed the detection signal back to the control system to control the action of the angle deflection component 4.

[0031] An inclination sensor 43 is used for closed-loop control. The support frame 1 and the ladder body 2 form a fixed channel. The lifting device 31 of the lifting assembly 3 pulls the sliding block 33 to slide along the guide rail 32, and the lifting plate 34 rises and falls accordingly. The lower and upper angle deflectors 41 of the angle deflection assembly 4 are stacked crosswise. After the worm motor 412 in each angle deflector 41 rotates, the torque is transmitted through the transmission worm 413, transmission worm wheel 414, universal drive shaft 415, sleeve block 416, fixed plate 417, double-end hinge block 418 and connecting plate 419, driving the angle rotation plate 44 to deflect. The inclination sensor 43 is fixed to the back of the angle rotation plate 44 with screws, measures the gravity vector in real time and outputs a signal to the control system. The control system compares the current inclination angle with the target value, sends a pulse command to the worm motor 412 to drive the angle deflection assembly 4 to move. At the same time, the telescopic cylinder 421 of the auxiliary device 42 extends and retracts until the inclination angle of the lifting plate 34 returns to zero. The servo motor 52 of the telescopic component 5 drives the transmission gear set 53, which causes the first sliding plate 54 and the second sliding plate 56 to extend and retract synchronously through the transmission chain 55, and the standing plate 57 moves horizontally along with the second sliding plate 56.

[0032] The sliding block 33 in the lifting assembly 3 cooperates with the guide rail 32 to make the lifting plate 34 rise and fall smoothly along the guide rail 32.

[0033] The lifting assembly 3 ensures smooth lifting. The support frame 1 connects to the ladder body 2, and is surrounded by an arc-shaped guardrail 22. The guide rail 32 is a double-row linear guide rail, vertically installed inside the support frame 1. The sliding block 33 contains multiple rows of circulating ball bearings that cooperate with the guide rail. The lifting device 31 uses an electric hoist; the wire rope's outlet end is connected to the sliding block 33, and the drum rewinds and unwinds the rope, causing the sliding block 33 to move up and down along the guide rail 32. The lifting plate 34 is fastened to the sliding block 33 with bolts, and the lifting plate 34 lifts and lowers synchronously. Two overlapping angle deflection components 4 are installed on the lifting plate 34. The mounting frame 411 of each angle deflector 41 is fixed to the lifting plate 34. The worm motor 412 drives the transmission worm 413 and the transmission worm wheel 414, which are transmitted through the universal drive shaft 415, the sleeve block 416, the fixing plate 417, the double-end hinge block 418 and the connecting plate 419 to drive the angle rotation plate 44 to tilt. The telescopic cylinder 421 of the auxiliary device 42 assists in pushing and pulling, and the tilt sensor 43 provides feedback on the attitude. The telescopic mounting plate 51 of the telescopic component 5 is fixed to the angle rotation plate 44. The servo motor 52 drives the first sliding plate 54 and the second sliding plate 56 through the transmission gear set 53 and the transmission chain 55, which causes the standing plate 57 to extend inward.

[0034] The first sliding plate 54 and the second sliding plate 56 of the telescopic component 5 are connected by a transmission chain 55, and the servo motor 52 drives the transmission gear set 53 to achieve synchronous telescopic movement.

[0035] The telescopic assembly 5 achieves synchronous telescopic extension and retraction. On the fixed system formed by the support frame 1 and the ladder body 2, the lifting assembly 3 drives the lifting plate 34 to be vertically positioned via the lifter 31, guide rail 32, and sliding block 33. The angle deflection assembly 4 achieves angle adjustment via the worm motor 412, transmission worm 413, transmission worm wheel 414, universal drive shaft 415, and connecting plate 419. The telescopic cylinder 421 of the auxiliary device 42 assists in stabilization, and the tilt sensor 43 monitors the angle. The telescopic assembly 5 includes a telescopic mounting plate 51, a servo motor 52, a transmission gear set 53, a first sliding plate 54, a transmission chain 55, and a second sliding plate 56. The telescopic mounting plate 51 is bolted to the angle rotation plate 44. The output shaft of the servo motor 52 is equipped with a drive gear. The transmission gear set 53 consists of a two-stage gear pair, with the final gear meshing with the rack on the first sliding plate 54. A sprocket is mounted at the end of the first sliding plate 54. A drive chain 55, after passing through this sprocket and a guide sprocket fixed to the telescopic mounting plate 51, connects to the drive point of the second sliding plate 56. When the servo motor 52 rotates, the gear set pushes the first sliding plate 54 to extend, and the drive chain 55 simultaneously pulls the second sliding plate 56 to move in the same direction. A standing plate 57 is fixed to the end of the second sliding plate 56, and a second side railing 58 stands around the standing plate 57.

[0036] The standing plate 57 is fixed to the second sliding plate 56, and its height and horizontal position can be adjusted by the telescopic component 5.

[0037] The height and horizontal position of the standing plate 57 are adjustable. The support frame 1 fixes the ladder body 2. The lifting device 31 of the lifting assembly 3 drives the sliding block 33 to slide vertically along the guide rail 32. The lifting plate 34 is connected to the sliding block 33 to achieve height adjustment. The angle deflection assembly 4 uses two angle deflectors 41 arranged in a cross-stack manner. It drives the angle rotation plate 44 by a worm motor 412, a transmission worm 413, a transmission worm wheel 414, a universal transmission shaft 415, a sleeve block 416, a fixing plate 417, a double-end hinge block 418, and a connecting plate 419. The telescopic cylinder 421 of the auxiliary device 42 provides auxiliary force. The tilt sensor 43 provides feedback signal to keep the angle rotation plate 44 in the set posture. The telescopic mounting plate 51 of the telescopic assembly 5 is fixed to the angle rotation plate 44. After the servo motor 52 is powered on, it drives the first sliding plate 54 through the transmission gear set 53. The transmission chain 55 drives the second sliding plate 56 to produce horizontal telescopic movement. The standing plate 57 is welded to the front end of the second sliding plate 56, and its horizontal position changes with the movement of the telescopic component 5. During operation, the lifting component 3 is activated first to adjust the height, then the angle deflection component 4 is used to adjust the level, and finally the telescopic component 5 is activated to extend the standing plate 57 inward.

[0038] The first side railing 12 is installed on the top of the support frame 1, the second side railing 58 is installed on the top of the standing plate 57, and the arc-shaped guardrail 22 is connected to the ladder body 2 to ensure safe use.

[0039] A first side railing 12 is welded to the upright of the support frame 1. The connecting ladder 21 of the ladder body 2 is fixed to the support frame 1. The arc-shaped guardrail 22 is welded to the outer edge of the connecting ladder 21. The upper end of the first side railing 12 is connected to the end of the arc-shaped guardrail 22 by a clamp. The lifting assembly 3 drives the lifting plate 34 to rise and fall along the guide rail 32. The worm motor 412, transmission worm 413, transmission worm wheel 414, universal drive shaft 415 of the angle deflection assembly 4 drive the angle rotation plate 44. The telescopic cylinder 421 of the auxiliary device 42 assists, and the tilt sensor 43 controls the attitude. The telescopic mounting plate 51 of the telescopic assembly 5 is installed on the angle rotation plate 44. The servo motor 52 drives the first sliding plate 54 and the second sliding plate 56 through the transmission gear set 53 and the transmission chain 55. The standing plate 57 is fixed to the second sliding plate 56. The second side railing 58 is vertically welded around the standing plate 57. When the telescopic component 5 is fully extended, the front end of the second side railing 58 and the extension section of the arc-shaped guardrail 22 form a continuous protective boundary in space. Each railing and the arc-shaped guardrail 22 work together to provide full-range protection.

[0040] The worm motor 412, transmission worm 413, transmission worm wheel 414 and universal drive shaft 415 of the angle deflector 41 constitute the transmission system, which is used to realize the angle control of the lifting plate 34.

[0041] The entire platform comprises a support frame 1, a ladder body 2, a lifting assembly 3, an angle deflection assembly 4, and a telescopic assembly 5. The transmission chain of the angle deflector 41 consists of a worm motor 412, a transmission worm 413, a transmission worm wheel 414, a universal drive shaft 415, a sleeve block 416, a fixing plate 417, a double-end hinge block 418, and a connecting plate 419. The worm motor 412 is a stepper motor, and its output shaft is connected to the transmission worm 413 via a flexible coupling. The transmission worm 413 and the transmission worm wheel 414 are a precision-rolled worm wheel pair. The hub of the transmission worm wheel 414 has a keyway. One end of the universal drive shaft 415 is pressed into the hub via a flat key, and the other end passes through the sleeve block 416 installed in the fixing plate 417. The sleeve block 416 contains an angular contact bearing for rotational support. The output flange of the universal drive shaft 415 is bolted to the double-end hinge block 418. The double-end hinge block 418 has double fork lugs. The connecting plate 419 is inserted into the fork lugs and hinged with a pin. The other end of the connecting plate 419 is bolted to the angle rotating plate 44. The worm motor 412 receives pulses and drives the worm to rotate, driving the worm wheel to reduce speed and increase torque. The torque is transmitted to the connecting plate 419 through the universal drive shaft 415 and the double-end hinge block 418, pushing the angle rotating plate 44 to deflect. The worm and worm wheel self-lock to maintain the angle. With the feedback from the telescopic cylinder 421 of the auxiliary device 42 and the tilt sensor 43, the angle of the lifting plate 34 can be adjusted steplessly and precisely. The telescopic assembly 5 then extends inward.

[0042] Working principle: The lifting unit 31 of the lifting assembly 3 drives the sliding block 33 to slide vertically along the guide rail 32 fixed to the support frame 1, and the lifting plate 34 rises to the working height with the sliding block 33; then the control system receives the attitude signal fed back by the tilt sensor 43 and controls the angle deflection assembly 4 to level, and the worm motors 412 of the two lower symmetrical angle deflectors 41 rotate synchronously, and the transmission worm 413 meshes with the transmission worm wheel 414 to reduce speed and increase torque. The torque is transmitted to the connecting plate 419 through the universal transmission shaft 415, the sleeve block 416, the fixed plate 417, and the double-end hinge block 418, driving the first layer angle rotation plate 44 to deflect around an axis. The upper layer angle deflection assembly 4 drives the second layer angle rotation plate 44 to deflect around the cross axis in the same way. One end of the telescopic cylinder 421 of the timing aid 42 is fixed by the mounting frame 411, and the other end is hinged to the corresponding movable plate by the hinge shaft 422. It actively telescopically extends to assist in completing the precise angle adjustment. After leveling, the servo motor 52 of the telescopic component 5 starts and drives the first sliding plate 54 to move through the transmission gear set 53. The first sliding plate 54 then drives the second sliding plate 56 to extend inward synchronously through the transmission chain 55. The standing plate 57 fixed on the second sliding plate 56 and the second side railing 58 extend horizontally to the construction position. Personnel climb the standing plate 57 through the arc-shaped guardrail 22 protection area of ​​the climbing ladder body 2 via the connecting climbing ladder 21. The entire process is protected by the first side railing 12, the arc-shaped guardrail 22 and the second side railing 58 to complete the inward extension operation.

[0043] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An inward-extending electric platform for a nuclear power plant construction hoist, characterized in that, include: Support frame (1) is used to support the ladder body (2) and lifting components (3); The ladder body (2) includes a connecting ladder (21) and an arc-shaped guardrail (22), and the ladder body (2) is fixed to the support frame (1) by the connecting ladder (21); The lifting assembly (3) includes a lifter (31), a guide rail (32), a sliding block (33) and a lifting plate (34), wherein the sliding block (33) slides along the guide rail (32) to drive the lifting plate (34) to move up and down; Angle deflection assembly (4) consists of two overlapping angle deflection assemblies (4). Each angle deflection assembly (4) includes two symmetrically arranged angle deflectors (41). Each angle deflector (41) includes a mounting frame (411), a worm motor (412), a transmission worm (413), a transmission worm wheel (414), a universal drive shaft (415), a sleeve (416), a fixing plate (417), a double-end hinge block (418), and a connecting plate (419). The angle deflector (41) is fixed to the lifting plate by the mounting frame (411). (34), and drives the lifting plate (34) to rotate at an angle via a worm motor (412), a transmission worm (413), a transmission worm wheel (414) and a universal drive shaft (415); the angle deflection assembly (4) also includes an auxiliary device (42), which includes a telescopic cylinder (421) and a hinge shaft (422), used to assist the angle deflector (41) in completing the angle adjustment; the angle deflection assembly (4) also includes an tilt sensor (43) and an angle rotation plate (44), used to detect the tilt angle of the lifting plate (34) and feed back a signal to the control system; The telescopic assembly (5) includes a telescopic mounting plate (51), a servo motor (52), a transmission gear set (53), a first sliding plate (54), a transmission chain (55), a second sliding plate (56), a standing plate (57), and a second side railing (58). The telescopic assembly (5) is used to adjust the horizontal position of the standing plate (57). The first sliding plate (54) and the second sliding plate (56) are connected by the transmission chain (55) and driven by the servo motor (52) and the transmission gear set (53).

2. The internally extending electric platform of a nuclear power engineering construction hoist according to claim 1, characterized in that, The two overlapping angle deflection components (4) cooperate with each other through the lifting plate (34) to realize the angle adjustment of the lifting plate (34) during the lifting process.

3. The internally extending electric platform of a nuclear power engineering construction hoist according to claim 1, characterized in that, Two symmetrically arranged angle deflectors (41) are connected to the connecting plate (419) via a universal drive shaft (415) to achieve a balanced distribution of rotational torque.

4. An internally extending electric platform for a nuclear power plant construction hoist according to any one of claims 1 to 3, characterized in that, One end of the telescopic cylinder (421) of the auxiliary device (42) is fixed to the mounting frame (411), and the other end is hinged to the lifting plate (34) through the hinge shaft (422) to realize the telescopic adjustment of the angle deflection component (4).

5. An internally extending electric platform for a nuclear power plant construction hoist according to claim 1, characterized in that, The tilt sensor (43) is fixed to the angle rotating plate (44) to detect the tilt change of the lifting plate (34) and feed the detection signal back to the control system to control the action of the angle deflection component (4).

6. The internally extending electric platform of a nuclear power engineering construction hoist according to claim 1, characterized in that, The sliding block (33) in the lifting assembly (3) works in conjunction with the guide rail (32) to make the lifting plate (34) rise and fall smoothly along the guide rail (32).

7. The internally extending electric platform of a nuclear power engineering construction hoist according to claim 1, characterized in that, The first sliding plate (54) and the second sliding plate (56) of the telescopic component (5) are connected by a transmission chain (55), and the servo motor (52) drives the transmission gear set (53) to achieve synchronous telescopic movement.

8. The internally extending electric platform of a nuclear power engineering construction hoist according to claim 1, characterized in that, The standing plate (57) is fixed on the second sliding plate (56) and its height and horizontal position can be adjusted by the telescopic component (5).

9. The internally extending electric platform of a nuclear power engineering construction hoist according to claim 1, characterized in that, The first side railing (12) is set on the top of the support frame (1), the second side railing (58) is set on the top of the standing board (57), and the arc-shaped guardrail (22) is connected to the ladder body (2) to ensure safe use.

10. The internally extending electric platform of a nuclear power engineering construction hoist according to claim 1, characterized in that, The worm motor (412), transmission worm (413), transmission worm wheel (414) and universal drive shaft (415) of the angle deflector (41) constitute the transmission system, which is used to realize the angle control of the lifting plate (34).

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