Aerial work lifting platform with failure safety protection function

Abstract

The invention belongs to the technical field of lifters, and discloses a high-altitude operation lifting platform with a failure safety protection function. The base is used for being connected with a wall surface and supporting other objects; a wind-up roller; the winding roller is rotationally connected to the interior of the base and used for winding the steel cable; a limiting disc; the limiting disc is welded to one end of the winding roller and used for locking the winding roller. A driving gear; the driving gear is welded to the other end of the winding roller and used for driving the winding roller to rotate. And a bidirectional self-locking structure is fixedly mounted on one side of the top end of the base. By means of secondary self-locking, it can be guaranteed that the wind-up roller is kept stable in the working process, accidental unlocking or moving is prevented, and therefore the safety of equipment operation is improved, the accident risk is reduced, meanwhile, the position and state of the wind-up roller are better fixed, the stability of the equipment is kept, and the service life of the equipment is prolonged. And the production interruption or the quality problem caused by accidental movement is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of elevators, and particularly relates to an aerial work lifting platform with a fail-safe protection function. Background Art

[0002] An aerial work lifting platform is a device used for working and maintenance at high altitudes, usually used in fields such as construction, repair, and cleaning. These platforms can provide a stable working platform, enabling operators to safely reach high places for operations. Currently, the aerial work lifting platform fixes the driving structure and then drives the steel rope to wind up by the driving structure to drive the hanging box to move vertically up and down. During this operation process, since the winding roller for winding the steel rope is not convenient for clamping and fixing, when the driving motor fails, it is impossible to effectively apply force to the hanging box, resulting in the problem of the hanging box falling rapidly, thus causing the problem of low safety of the device. Summary of the Invention

[0003] Aiming at the problem in the prior art that the aerial work lifting platform fixes the driving structure and then drives the steel rope to wind up by the driving structure to drive the hanging box to move vertically up and down. During this operation process, since the winding roller for winding the steel rope is not convenient for clamping and fixing, when the driving motor fails, it is impossible to effectively apply force to the hanging box, resulting in the problem of the hanging box falling rapidly, thus causing the problem of low safety of the device, the present invention proposes the following technical solutions: An aerial work lifting platform with a fail-safe protection function, comprising: A base; the base is used for connecting to a wall and supporting other objects; A winding roller; the winding roller is rotatably connected inside the base for winding a steel cable; A limiting disk; the limiting disk is welded to one end of the winding roller for locking the winding roller; A driving gear; the driving gear is welded to the other end of the winding roller for driving the winding roller to rotate; One side of the top end of the base is fixedly provided with a two-way self-locking structure, the two-way self-locking structure includes a fixed seat fixedly installed at the top end of the base, one side inside the fixed seat is fixedly provided with a fixed clamping plate, an active clamping plate is horizontally movably connected at a position corresponding to one end of the fixed clamping plate inside the fixed seat, clamping rods are symmetrically slidably connected to the top end of the fixed seat, one end of the clamping rod is fixedly provided with a spring telescopic rod, fitting holes are equidistantly arranged on the outer surface edge of the limiting disk, a driving and adjusting structure is fixedly installed on one side of the top end of the base, and a positioning and self-locking structure is installed at a position outside the driving and adjusting structure on the top end of the base.

[0004] Preferably, an oil cylinder is fixedly installed inside the fixed seat. The output end of the oil cylinder is clamped and installed with a Z-shaped plate, and one end of the Z-shaped plate is fixedly connected to one end of the movable clamping plate. A protrusion is welded in the middle of the top end of the Z-shaped plate. The top end of the protrusion is fitted and connected with a lifting rod. A connecting block is welded on the back of the lifting rod. The two ends of the connecting block are symmetrically and movably connected with rotating bars, and one end of the rotating bar is movably connected with a clamping rod.

[0005] Preferably, a positioning column penetrates and connects one side of the inner wall of the connecting block. A spring telescopic column is fixedly installed at the position outside the positioning column at the top end of the connecting block, and a mounting frame is fixedly installed at the top end of the spring telescopic column. The bottom end of the mounting frame is welded to the top end of the fixed seat.

[0006] Preferably, a fillet is provided at one edge of one end of the spring telescopic rod. The inner diameter of the movable end of the spring telescopic rod is equal to the inner diameter of the fitting hole. The edge of the inner wall of the mounting frame and the outside of the connecting block are mutually fitted.

[0007] Preferably, the driving and adjusting structure includes a driving motor fixedly installed on the base. A connecting shaft sleeve is connected to the outside of the driving shaft of the driving motor through a flat key. One end of the connecting shaft sleeve is clamped and installed with a belt connection structure. The outside of the belt connection structure is fixedly installed with a housing, and the housing is fixedly installed at the top end of the base. One end of the belt connection structure is clamped and installed with a driving saw gear, and the driving saw gear is rotatably connected with the housing. The outside of the driving saw gear and the outside of the driving gear are mutually meshed.

[0008] Preferably, a driven saw gear is meshed with the top of the outer surface of the driving gear. One end of the driven saw gear is welded with a lead screw. The outside of the lead screw is rotatably connected with a positioning frame. The bottom end of the positioning frame is welded with a support frame, and the support frame is installed on the base through screws. A moving block is threadedly connected to the outside of the lead screw at the position inside the positioning frame.

[0009] Preferably, the positioning and self-locking structure includes a mounting rod fixedly installed at the top end of the base. Clamping plates are symmetrically and fixedly installed inside the mounting rod. Clamping pieces are fixedly installed on one end face of the clamping plates. A hydraulic cylinder is fixedly installed outside the mounting rod. The movable end of the hydraulic cylinder is movably connected with a rotating frame, and the rotating frame is rotatably connected with the mounting rod. A round rod is movably installed inside the rotating frame. A rotating rod is installed on the outside of the round rod through threads, and the rotating rod is rotatably installed inside the mounting rod.

[0010] Preferably, a rotating column is rotatably connected to the bottom end of the inner wall of the mounting rod. A cross-shaped column is threadedly connected inside the rotating column. A fixing sleeve is sleeved outside the cross-shaped column. A compression spring is sleeved inside the fixing sleeve outside the cross-shaped column.

[0011] Preferably, the number of the clamping pieces is set to two, and the two clamping pieces are symmetrically arranged with respect to the vertical center line of the connecting bushing, and the connecting bushing is located between the two clamping pieces.

[0012] The beneficial effects of the present invention are as follows: (1) The present invention can prevent the problem that the winding roller rotates reversely after the driving motor fails. Avoiding the reverse rotation of the winding roller can ensure the safety during the operation of the equipment, reduce the occurrence of accidents, protect the safety of operators and equipment, and at the same time help protect the equipment from damage, extend the service life of the equipment, and reduce the cost of maintenance and replacement of parts; (2) The present invention can achieve the purpose of secondary self-locking of the winding roller. The secondary self-locking can ensure the stability of the winding roller during operation, prevent accidental unlocking or movement, thereby improving the safety of equipment operation, reducing the accident risk, and at the same time making the position and state of the winding roller better fixed, which helps to maintain the stability of the equipment, avoid production interruption or quality problems caused by accidental movement, and the secondary self-locking can simplify the operation process, reduce human intervention, improve the convenience and efficiency of operation, and reduce the possibility of operation errors; (3) When the clamping plate moves, it drives the clamping pieces to clamp the connecting bushing, making the driving shaft of the driving motor more stable during the stopping process, indirectly increasing the safety of the device during use, and being able to limit the left and right sides of the connecting bushing of the driving motor, preventing the problem of swing of the connecting bushing from occurring, further making the rotation center point of the driving shaft of the driving motor consistent, avoiding instability and vibration caused by swing, ensuring the smooth operation of the equipment, and at the same time keeping the rotation center point of the driving shaft of the driving motor consistent can improve the transmission efficiency, ensure the stability and high efficiency of energy transfer, and enhance the performance of the equipment; (4) Calculating the length of the steel cable wound by the winding roller through the moving distance of the moving block can help determine the usage amount of the steel cable, ensure that there is enough length available during the lifting and lowering of the hanging box, avoid operation interruption or accidents caused by insufficient length. In addition, by measuring the lifting height of the hanging box, the accuracy and stability of the height of the hanging box during operation can be ensured, which helps to improve work safety, reduce accidental risks, and ensure that the hanging box can operate at the predetermined height, thereby ensuring the smooth progress of the production process. Description of the Drawings

[0013] Figure 1 Shows a structural schematic diagram of an aerial work lifting platform with a fail-safe protection function; Figure 2 Shows a structural schematic diagram of a two-way self-locking structure; Figure 3 Shows a mounting structural schematic diagram of a clamping rod; Figure 4 The structural schematic diagram of the drive adjustment structure is shown; Figure 5 The structural schematic diagram of the belt connection structure is shown; Figure 6 The structural schematic diagram of the positioning self-locking structure is shown.

[0014] In the figure: 1. Base; 2. Winding roller; 3. Limit disc; 4. Driving gear; 5. Bi-directional self-locking structure; 51. Fixed seat; 52. Oil cylinder; 53. Z-shaped plate; 54. Movable clamping plate; 55. Fixed clamping plate; 56. Brake pad; 57. Protrusion; 58. Lifting rod; 59. Connecting block; 510. Rotating bar; 511. Clamping rod; 512. Spring telescopic rod; 513. Spring telescopic column; 514. Positioning column; 515. Mounting frame; 6. Drive adjustment structure; 61. Moving block; 62. Driving sawtooth gear; 63. Outer shell; 64. Belt connection structure; 65. Connecting shaft sleeve; 66. Driving motor; 67. Driven sawtooth gear; 68. Lead screw; 69. Positioning frame; 610. Support frame; 7. Positioning self-locking structure; 71. Mounting rod; 72. Clamping plate; 73. Clamping piece; 74. Hydraulic cylinder; 75. Rotating frame; 76. Round rod; 77. Rotating rod; 78. Rotating column; 79. Cross-shaped column; 710. Fixed sleeve; 711. Compression spring; 8. Fitting hole. Detailed implementation manners

[0015] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0016] Embodiment 1: The present invention provides an aerial work lift platform with a fail-safe protection function, as Figure 1-6 shown, including: Base 1; The base 1 is used to connect to the wall and support the rest of the objects; Winding roller 2; The winding roller 2 is rotatably connected inside the base 1 for winding the steel cable; Limit disc 3; The limit disc 3 is welded to one end of the winding roller 2 for locking the winding roller 2; Driving gear 4; The driving gear 4 is welded to the other end of the winding roller 2 for driving the winding roller 2 to rotate; One side of the top end of the base 1 is fixedly installed with a two-way self-locking structure 5. The two-way self-locking structure 5 includes a fixed seat 51 fixedly installed at the top end of the base 1. One side inside the fixed seat 51 is fixedly installed with a fixed clamping plate 55. A movable clamping plate 54 is horizontally movably connected inside the fixed seat 51 at a position corresponding to one end of the fixed clamping plate 55. The top end of the fixed seat 51 is symmetrically slidably connected with clamping rods 511. One end of the clamping rod 511 is fixedly installed with a spring telescopic rod 512. Equally spaced fitting holes 8 are opened on the outer surface edge of the limiting disc 3. One side of the top end of the base 1 is fixedly installed with a driving and adjusting structure 6. A positioning and self-locking structure 7 is installed at the top end of the base 1 at a position outside the driving and adjusting structure 6.

[0017] As Figure 2 and Figure 3 shown, an oil cylinder 52 is fixedly installed inside the fixed seat 51. The output end of the oil cylinder 52 is clamped and installed with a Z-shaped plate 53, and a fixed connection is made between one end of the Z-shaped plate 53 and one end of the movable clamping plate 54. A protrusion 57 is welded in the middle of the top end of the Z-shaped plate 53. A lifting rod 58 is attached to the top of the protrusion 57. A connecting block 59 is welded to the back of the lifting rod 58. Rotating bars 510 are symmetrically movably connected to both ends of the lifting rod 58 and the connecting block 59, and one end of the rotating bar 510 is movably connected to the clamping rod 511. The movement of the Z-shaped plate 53 drives the movement of the protrusion 57. When the protrusion 57 moves, it can drive the connecting block 59 to rise. When the connecting block 59 rises, it drives the rotating bar 510 to deflect. When the rotating bar 510 deflects, it drives the two clamping rods 511 to clamp synchronously. During the synchronous clamping process of the two clamping rods 511, the spring telescopic rod 512 is displaced. When the spring telescopic rod 512 moves, it squeezes the limiting disc 3, increasing the squeezing force between the limiting disc 3 and the spring telescopic rod 512, so that the limiting disc 3 is fixed more stably, preventing the problem that the limiting disc 3 falls due to losing effective protection. One side of the inner wall of the connecting block 59 is penetrated and connected with a positioning column 514. A spring telescopic column 513 is fixedly installed at the top end of the connecting block 59 at a position outside the positioning column 514, and an installation frame 515 is fixedly installed at the top end of the spring telescopic column 513. The bottom end of the installation frame 515 is welded to the top end of the fixed seat 51. Since the movement of the protrusion 57 can drive the connecting block 59 to rise, and during the rising process, it is limited by the spring telescopic column 513, the positioning column 514 and the installation frame 515, preventing the problem of the connecting block 59 from swinging, and it can not prevent the upward movement of the connecting block 59, and at the same time can drive the connecting block 59 to reset, changing the reset difficulty of the connecting block 59. A fillet is opened at one side edge of one end of the spring telescopic rod 512. The inner diameter of the movable end of the spring telescopic rod 512 is equal to the inner diameter of the fitting hole 8. The inner wall edge of the installation frame 515 and the outside of the connecting block 59 are mutually attached. When the limiting disc 3 rotates slightly during the clamping process, at this time, when the fitting hole 8 and the movable end of the spring telescopic rod 512 are attached, the movable end of the spring telescopic rod 512 enters into the fitting hole 8, so as to achieve secondary clamping and fixing of the limiting disc 3, further increasing the stability of the limiting disc 3; As Figure 4 and Figure 5 shown, the driving and adjusting structure 6 includes a driving motor 66 fixedly installed on the base 1. A connecting shaft sleeve 65 is connected to the outside of the driving shaft of the driving motor 66 by a flat key. One end of the connecting shaft sleeve 65 is clamped and installed with a belt connecting structure 64. The outside of the belt connecting structure 64 is fixedly installed with a housing 63, and the housing 63 is fixedly installed on the top end of the base 1. One end of the belt connecting structure 64 is clamped and installed with a driving saw gear 62, and the driving saw gear 62 is rotatably connected between the housing 63. The outside of the driving saw gear 62 meshes with the outside of the driving gear 4. The top of the outer surface of the driving gear 4 is meshed and connected with a driven saw gear 67. One end of the driven saw gear 67 is welded with a lead screw 68. The outside of the lead screw 68 is rotatably connected with a positioning frame 69. The bottom end of the positioning frame 69 is welded with a support frame 610, and the support frame 610 is installed on the base 1 by screws. The outside of the lead screw 68 is threadedly connected with a moving block 61 inside the positioning frame 69. When the driven saw gear 67 rotates, it can drive the moving block 61 to move through the lead screw 68. The distance that the moving block 61 moves on the lead screw 68 is used to calculate the number of turns of the winding roller 2, so as to facilitate observing the lifting height of the hanging box.

[0018] As Figure 1 and Figure 6As shown, the positioning self-locking structure 7 includes a mounting rod 71 fixedly mounted on the top of the base 1, a clamping plate 72 is symmetrically fixedly mounted inside the mounting rod 71, a clamping piece 73 is fixedly mounted on one end surface of the clamping plate 72, a hydraulic cylinder 74 is fixedly mounted on the outside of the mounting rod 71, a rotating frame 75 is movably connected to the movable end of the hydraulic cylinder 74, and the rotating frame 75 and the mounting rod 71 are rotatably connected, a round rod 76 is movably mounted inside the rotating frame 75, a rotating rod 77 is threadedly mounted on the outside of the round rod 76, and the rotating rod 77 is rotatably mounted inside the mounting rod 71, the driving of the hydraulic cylinder 74 can drive the round rod 76 to bend, and the bending process of the round rod 76 drives the mounting rod 71 to deflect, so that the top ends of the two mounting rods 71 ​​approach each other, and the clamping plate 72 drives the clamping piece 73 to clamp the connecting sleeve 65 during the process of the mounting rods 71 ​​approaching each other, so that the connecting sleeve 65 is clamped and fixed, and the bottom end of the inner wall of the mounting rod 71 is rotatably connected to the rotating column 7 8. A cross-shaped column 79 is connected to the rotating column 78 through a thread. A fixing sleeve 710 is sleeved on the outer side of the cross-shaped column 79. The fixing sleeve 710 is fixedly installed at one end of the mounting rod 71. An extrusion spring 711 is sleeved on the outer side of the cross-shaped column 79 inside the fixing sleeve 710. When the mounting rod 71 is deflected, the cross-shaped column 79 moves inside the fixing sleeve 710 and squeezes the extrusion spring 711. The extrusion spring 711 is used to reduce the vibration between the two mounting rods 71, thereby making the two mounting rods 71 ​​more stable. The number of clamping plates 73 is set to two in total, and the two clamping plates 73 are symmetrically arranged about the vertical center line of the connecting sleeve 65. The connecting sleeve 65 is located between the two clamping plates 73, and is used to clamp the outer sides of the two ends of the connecting sleeve 65 so that the connecting sleeve 65 is clamped and fixed. A steel cable is wound around the winding roller 2, and a hanging box is connected between one ends of several of the steel cables to drive the lifting of the hanging box.

[0019] Working principle: During actual use of the device, the drive motor 66 is started. When the drive motor 66 operates, it drives the belt connection structure 64 to operate through the connecting bushing 65. When the belt connection structure 64 operates, it drives the drive saw gear 62 to rotate. When the drive saw gear 62 rotates, it drives the winding roller 2 to rotate through the drive gear 4. When the winding roller 2 rotates, it synchronously drives the limit disc 3 to rotate. And at the same time, when the drive gear 4 rotates, it drives the driven saw gear 67 to rotate. When the driven saw gear 67 rotates, it drives the lead screw 68 inside the positioning frame 69 to rotate. When the lead screw 68 rotates, it drives the moving block 61 to move along the inside of the positioning frame 69, so that when the winding roller 2 rotates, the moving block 61 makes a synchronous displacement. Calculating the length of the steel cable wound by the winding roller 2 through the distance of the movement of the moving block 61 can help determine the usage amount of the steel cable, ensure that there is enough length available during the lifting and lowering of the suspension box, avoid operation interruption or accidents caused by insufficient length. In addition, by measuring the lifting height of the suspension box, the accuracy and stability of the height of the suspension box during operation can be ensured. This helps improve work safety, reduce accidental risks, and ensure that the suspension box can operate at the predetermined height, thus ensuring the smooth progress of the production process; Then when the steel cable inside the winding roller 2 is unwound to a pre-determined position, at this time, the hydraulic cylinder 74 drives the rotating frame 75 to flip. When the rotating frame 75 flips, it drives the rotating rod 77 to bend, and at this time drives the rotating column 78 to rotate. Since the rotating rod 77 drives the two mounting rods 71 to bend inward during the bending process, at this time the bent mounting rods 71 drive the clamping plate 72 to move. When the clamping plate 72 moves, it drives the clamping piece 73 to clamp the connecting bushing 65, making the drive shaft of the drive motor 66 more stable during the stopping process, indirectly increasing the safety of the device during use, and being able to limit the left and right sides of the connecting bushing 65 of the drive motor 66, preventing the problem of swing of the connecting bushing 65 from occurring, further making the rotation center point of the drive shaft of the drive motor 66 consistent, avoiding instability and vibration caused by swing, ensuring the smooth operation of the equipment. At the same time, keeping the rotation center point of the drive shaft of the drive motor 66 consistent can improve the transmission efficiency, ensure the stability and high efficiency of energy transfer, and enhance the performance of the equipment. And during this process, the cross-shaped column 79 moves along the inside of the fixed sleeve 710, thereby driving the compression spring 711 to be compressed, and the compressed compression spring 711 is used to facilitate the reset of the mounting rod 71; Finally, the oil cylinder 52 is activated. When the oil cylinder 52 operates, it drives the Z-shaped plate 53 to move. When the Z-shaped plate 53 moves, it drives the movable clamping plate 54 to move. When the movable clamping plate 54 moves, it drives the brake pads 56 to squeeze the limit disc 3, so that the brake pads 56 of the limit disc 3 and the fixed clamping plate 55 are in contact, thereby achieving the purpose of squeezing and fixing the limit disc 3, preventing the problem that the winding roller 2 rotates in the reverse direction after the driving motor 66 fails. Avoiding the reverse rotation of the winding roller 2 can ensure the safety during the operation of the equipment, reduce the occurrence of accidents, protect the safety of operators and equipment, and at the same time help protect the equipment from damage, extend the service life of the equipment, reduce the cost of maintenance and replacement of parts. And at this time, since the Z-shaped plate 53 drives the lifting rod 58 to move through the protrusion 57 when it moves, the lifting rod 58 drives the connecting block 59 to move when it moves, the connecting block 59 drives the rotating bar 510 to deflect when it moves, the rotating bar 510 drives the two clamping rods 511 to move relatively when it deflects, the clamping rods 511 drive the spring telescopic rod 512 to move relatively when they move, and make the spring telescopic rod 512 continue to move after fitting with the limit disc 3. At this time, the spring telescopic rod 512 is compressed. And when the limit disc 3 rotates slightly due to the unstable clamping of the two brake pads 56, when the fitting hole 8 and the movable end of the spring telescopic rod 512 are in contact, the movable end of the spring telescopic rod 512 is squeezed into the fitting hole 8 due to the tension. The squeezed spring telescopic rod 512 clamps the limit disc 3, thereby achieving the purpose of secondary self-locking of the limit disc 3, and further achieving the purpose of secondary self-locking of the winding roller 2. Secondary self-locking can ensure that the winding roller 2 remains stable during operation, prevent accidental unlocking or movement, thereby improving the safety of equipment operation, reducing the risk of accidents, and at the same time making the position and state of the winding roller 2 better fixed, helping to maintain the stability of the equipment, avoiding production interruption or quality problems caused by accidental movement. And secondary self-locking can simplify the operation process, reduce human intervention, improve the convenience and efficiency of operation, and reduce the possibility of operation errors.

[0020] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it.

Claims

1. A high-altitude work lifting platform with a failure safety protection function, characterized in that: include: Base (1); the base (1) is used to connect to a wall and support other objects; A winding roller (2); the winding roller (2) is rotatably connected to the inside of the base (1) and is used to wind up the steel cable; A limit plate (3); the limit plate (3) is welded to one end of the winding roller (2) and is used to lock the winding roller (2); A driving gear (4); the driving gear (4) is welded to the other end of the winding roller (2) and is used to drive the winding roller (2) to rotate; a bidirectional self-locking structure (5) is fixedly installed on one side of the top of the base (1), and the bidirectional self-locking structure (5) comprises a fixed seat (51) fixedly installed on the top of the base (1); a fixed clamping plate (55) is fixedly installed on one side of the inside of the fixed seat (51); a movable clamping plate (54) is horizontally movably connected at a position corresponding to one end of the fixed clamping plate (55) inside the fixed seat (51); a clamping rod (511) is symmetrically slidably connected to the top of the fixed seat (51); a spring telescopic rod (512) is fixedly installed at one end of the clamping rod (511); fitting holes (8) are equidistantly provided on the edge of the outer surface of the limit plate (3); a driving adjustment structure (6) is fixedly installed on one side of the top of the base (1); and a positioning self-locking structure (7) is installed at the top of the base (1) at a position outside the driving adjustment structure (6).

2. The aerial work lifting platform with failure safety protection function according to claim 1 is characterized in that: An oil cylinder (52) is fixedly installed inside the fixed seat (51); a Z-shaped plate (53) is clamped and installed at the output end of the oil cylinder (52); one end of the Z-shaped plate (53) and one end of the movable clamp (54) are fixedly connected; a protrusion (57) is welded at the middle of the top end of the Z-shaped plate (53); a lifting rod (58) is fittedly connected to the top end of the protrusion (57); a connecting block (59) is welded to the back of the lifting rod (58); two ends of the connecting block (59) are symmetrically and movably connected to a rotating bar (510); and one end of the rotating bar (510) is movably connected to a clamping rod (511).

3. The aerial work lifting platform with failure safety protection function according to claim 2 is characterized in that: A positioning column (514) is connected and penetrated through one side of the inner wall of the connection block (59); a spring telescopic column (513) is fixedly installed at the top of the connection block (59) at a position outside the positioning column (514); and a mounting frame (515) is fixedly installed at the top of the spring telescopic column (513); the bottom end of the mounting frame (515) is welded to the top end of the fixing seat (51).

4. The aerial work lifting platform with failure safety protection function according to claim 3 is characterized in that: One end edge of the spring telescopic rod (512) is provided with a rounded corner, the inner diameter of the movable end of the spring telescopic rod (512) is equal to the inner diameter of the fitting hole (8), and the inner wall edge of the mounting frame (515) and the outer side of the connecting block (59) fit together.

5. The aerial work lifting platform with failure safety protection function according to claim 1, characterized in that: The drive adjustment structure (6) comprises a drive motor (66) fixedly mounted on the base (1); the outer side of the drive shaft of the drive motor (66) is connected to a connecting sleeve (65) via a flat key; one end of the connecting sleeve (65) is clamped and mounted with a belt connection structure (64); the outer side of the belt connection structure (64) is fixedly mounted with a housing (63), and the housing (63) is fixedly mounted on the top of the base (1); one end of the belt connection structure (64) is clamped and mounted with a drive saw gear (62); the drive saw gear (62) and the housing (63) are rotatably connected; the outer side of the drive saw gear (62) and the outer side of the drive gear (4) are meshed with each other.

6. The aerial work lifting platform with failure safety protection function according to claim 5, characterized in that: The top of the outer surface of the driving gear (4) is meshingly connected with a driven saw gear (67), one end of the driven saw gear (67) is welded with a screw rod (68), the outer side of the screw rod (68) is rotatably connected with a positioning frame (69), the bottom end of the positioning frame (69) is welded with a support frame (610), and the support frame (610) is mounted on the base (1) by means of screws, and the outer side of the screw rod (68) is located inside the positioning frame (69) and is connected to a moving block (61) by means of threads.

7. The aerial work lifting platform with failure safety protection function according to claim 1, characterized in that: The positioning self-locking structure (7) comprises a mounting rod (71) fixedly mounted on the top of the base (1); a clamping plate (72) is symmetrically fixedly mounted inside the mounting rod (71); a clamping sheet (73) is fixedly mounted on one end surface of the clamping plate (72); a hydraulic cylinder (74) is fixedly mounted on the outside of the mounting rod (71); a rotating frame (75) is movably connected to the movable end of the hydraulic cylinder (74); and the rotating frame (75) and the mounting rod (71) are rotatably connected; a round rod (76) is movably mounted inside the rotating frame (75); a rotating rod (77) is threadedly mounted on the outside of the round rod (76); and the rotating rod (77) is rotatably mounted inside the mounting rod (71).

8. The aerial work lifting platform with failure safety protection function according to claim 7, characterized in that: The bottom end of the inner wall of the mounting rod (71) is rotatably connected to a rotating column (78), the interior of the rotating column (78) is connected to a cross-shaped column (79) via a thread, a fixing sleeve (710) is sleeved on the outside of the cross-shaped column (79), and an extrusion spring (711) is sleeved on the inside of the fixing sleeve (710) and located on the outside of the cross-shaped column (79).

9. The aerial work lifting platform with failure safety protection function according to claim 7, characterized in that: The number of the clamping pieces (73) is set to two in total, and the two clamping pieces (73) are symmetrically arranged about the vertical center line of the connecting shaft sleeve (65), and the connecting shaft sleeve (65) is located between the two clamping pieces (73).

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