Safe and efficient vertical shaft elevator

Abstract

The invention belongs to the technical field of crane equipment, and particularly relates to a safe and efficient vertical shaft elevator which comprises a door frame, and a 3t trolley is slidably connected to the door frame. The output end of the 3t trolley is connected with a connecting mechanism, and the connecting mechanism is connected with a manned lifting cage; the connecting mechanism comprises a safety box connected with the manned lifting cage, and the front end and the rear end of the safety box are each provided with two fixed pulley blocks which are arranged in a staggered mode and matched with a steel wire rope of the 3t trolley; each fixed pulley block comprises a pair of fixed pulleys which are symmetrically arranged and rotationally connected with the safety box, and a safety device for synchronously fixing the vertical steel wire rope and the steel wire rope between the pair of fixed pulleys is arranged on the safety box; according to the invention, the problem that the operation risk of the existing man-carrying cage of the vertical shaft hoist in high-altitude and low-temperature-resistant regions is high is effectively solved, and the safe operation requirement of the lifting height of 400 meters in the high-altitude regions can be met.

Description

Technical Field

[0001] The invention belongs to the technical field of crane equipment, and in particular relates to a safe and efficient shaft hoist. Background Art

[0002] Shaft hoists are widely used in various fields that require vertical transportation, including but not limited to: Factories and warehouses: used to lift goods and realize vertical transportation, which is convenient and fast, and improves production efficiency. Mines and tunnels: used to lift ore, earth and stone and other materials, and are the main transportation equipment connecting the underground and the ground in mining projects. Buildings and bridges: used for vertical lifting of materials and equipment, which helps the smooth progress of the project. Other occasions: such as museums, elevators and other occasions that require vertical lifting, shaft hoists can also be used as a substitute for elevators to transport personnel.

[0003] The shaft hoist is composed of a gantry, a trolley, a manned cage and other equipment. When personnel are lifted by the shaft hoist in mines and tunnels, the trolley and the manned cage are connected and lifted by a wire rope and a fixed pulley. However, simply using multiple wire ropes and fixed pulleys to lift the manned cage makes the lifting of the manned cage extremely risky, posing a great threat to the lives of construction workers. Appropriate safety protection measures must be taken to ensure the safe operation of the cage. Especially in high-altitude, low-temperature resistant areas, and when the lifting height is 400 meters, the setting of safety protection measures on the manned cage is even more important. Summary of the invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a safe and efficient shaft hoist, which effectively solves the problem that the existing manned hoist cage of the shaft hoist has high operating risks in high-altitude and low-temperature resistant areas, and can achieve safe operation at a lifting height of 400 meters in high-altitude areas.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a safe and efficient shaft hoist, comprising a gantry, a 3t trolley is slidably connected to the gantry; the output end of the 3t trolley is connected to a connecting mechanism, and a manned cage is connected to the connecting mechanism; the connecting mechanism comprises a safety box connected to the manned cage, and the front and rear ends of the safety box are provided with two groups of staggered fixed pulley groups that cooperate with the steel wire rope of the 3t trolley; the two groups of fixed pulley groups each include a pair of symmetrically arranged fixed pulleys that are rotatably connected to the safety box, and the safety box is provided with a safety device for synchronously fixing the vertical steel wire rope and the steel wire rope between the pair of fixed pulleys; The safety device includes a sliding frame arranged between a pair of fixed pulleys and slidably connected to a safety box, and a movable pulley cooperating with a steel wire rope is rotatably connected to the sliding frame; a lower top spring cooperating with the sliding frame is provided on the safety box, and a middle fixing structure is also slidably connected to the safety box for fixing the steel wire rope between the pair of fixed pulleys as the sliding frame rises; the safety box is also provided with a side fixing structure for fixing the vertical steel wire rope, and the side fixing structure moves as the middle fixing structure moves.

[0006] Furthermore, a trolley running mechanism is provided on the gantry, and a control room is also provided on the gantry; a 10t trolley is also provided on the gantry, and a hook is connected to the output end of the 10t trolley.

[0007] Furthermore, the middle fixed structure includes a fan-shaped block slidably connected to the sliding frame, the fan-shaped block is provided with a limit block cooperating with the sliding frame, and the fan-shaped block is provided with a fan-shaped tooth groove cooperating with the movable pulley; the fan-shaped block is fixedly connected to an upper sliding rod slidably connected to the safety box, the safety box is provided with an upper top spring sleeved on the upper sliding rod, and the upper top spring is arranged between the safety box and the fan-shaped block.

[0008] Furthermore, the side fixing structure includes a fixing cylinder fixedly connected to the safety box, an eccentric wheel is rotatably connected to the fixing cylinder, fixing teeth for fixing the wire rope are arranged on the outer periphery of the eccentric wheel, and a stress groove cooperating with the eccentric wheel is arranged on the fixing cylinder.

[0009] Furthermore, the safety box is rotatably connected to a synchronization block, and the synchronization block is eccentrically rotatably connected to a driving rod; the upper sliding rod is fixedly connected to a lifting block, and the lifting block is rotatably connected to an end of the driving rod away from the synchronization block; the synchronization block is also eccentrically rotatably connected to a synchronization rod, and the synchronization rod is rotatably connected to a traction block fixed to the eccentric wheel.

[0010] Furthermore, the safety box is rotatably connected to a synchronous crank, and the center position of the synchronous crank is rotatably connected to the safety box; one end of the synchronous crank is rotatably connected to a lower connecting rod, and the other end of the lower connecting rod is rotatably connected to the sliding frame; the synchronous crank is also rotatably connected to an upper connecting rod, and the other end of the upper connecting rod is rotatably connected to the middle fixed structure.

[0011] Furthermore, the safety box is rotatably connected to multiple guide wheel groups that respectively cooperate with the multiple steel wire ropes, and the multiple guide wheel groups each include a pair of guide wheels respectively arranged on both sides of the steel wire rope, and the axis of the guide wheel is arranged parallel to the axis of the movable pulley.

[0012] Furthermore, the safety box is provided with two sets of driving structures respectively cooperating with the fixed pulley groups at the front end and rear end of the safety box, and the pair of sliding frames at the front end of the safety box and the pair of sliding frames at the rear end are both connected with connecting structures, and the pair of sliding frames move synchronously through the connecting structure.

[0013] Furthermore, the driving structure includes a motor fixedly connected to the safety box, and the output end of the motor is fixedly connected to an input bevel gear group; the output end of the input bevel gear group is connected to a first spline shaft, and a first spline cylinder is slidably connected to the first spline shaft; an active clutch block is fixedly connected to the first spline cylinder, and a driven clutch block that cooperates with the active clutch block is rotatably connected to the safety box; the driven clutch block is connected to the output bevel gear group, and the output end of the output bevel gear group is fixedly connected to the synchronous crank; a clutch telescopic rod is fixedly connected to the safety box, and the telescopic end of the clutch telescopic rod is fixedly connected to a sleeve, and the first spline cylinder is rotatably connected to the sleeve.

[0014] Further, the connecting structure includes a pair of rotating rods respectively rotatably connected to a pair of the sliding frames, and the pair of rotating rods are rotatably connected to each other; a pair of the sliding frames are fixedly connected to a second spline shaft, and a pair of the rotating rods are respectively rotatably connected to a pair of the second spline shafts; a pair of the spline shafts are slidably connected to a connecting clutch block, and a pair of the rotating rods are fixedly connected to a fixed clutch block that cooperates with the connecting clutch block.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. When the present invention is in use, through the arrangement of the sliding frame, the movable pulley, the lower top spring, the middle fixed structure, the side fixed structure, etc., when one of the steel wire ropes breaks, the present application realizes the lifting and lowering of the manned cage through the cooperation of the four fixed pulley groups and the four steel wire ropes; the other steel wire rope on the side where the steel wire rope is broken can still be used to lift the manned cage, thereby maintaining the stability of the manned cage; the broken steel wire rope is fixed by the middle fixed structure and the side fixed structure, which can effectively prevent the steel wire rope from being separated from the fixed pulley and swinging uncontrollably in the air to cause injuries to the staff in the manned cage.

[0016] 2. When the present invention is in use, when the steel wire ropes at the front end or the rear end of the safety box break at the same time, under the action of the sliding frame, the middle fixed structure fixes the steel wire rope between a pair of fixed pulleys, and the side fixed structure fixes the vertical steel wire rope, thereby realizing multi-point fixation of the steel wire rope to avoid separation of the steel wire rope from the safety box, causing the safety box and the manned cage to tilt under the action of the steel wire rope at one end, and the overall weight of the manned cage falls completely on the remaining steel wire ropes, causing the remaining steel wire ropes to break in a chain reaction, which can effectively prevent the manned cage from overturning and improve the safety of the manned cage.

[0017] 3. When the present invention is in use, the side fixing structure fixes the vertical steel wire rope through the eccentric wheel, and fixes the middle steel wire rope through the cooperation of the sector block and the movable pulley; in addition, the eccentric wheel and the sector block are synchronized by the setting of the synchronization block, the driving rod, the synchronization rod, etc.; and under the action of the eccentric wheel, the steel wire rope pulls the eccentric wheel upward, so that the eccentric wheel fixes the steel wire rope more stably, and the eccentric wheel makes the sector block fix the steel wire rope more stably through the synchronization rod, the synchronization block, the driving rod, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a structural schematic diagram of the connecting mechanism in the present invention; Figure 3 It is a first isometric view of the safety device of the present invention; Figure 4 is a second isometric view of the safety device of the present invention; Figure 5 is a cross-sectional view of the safety device of the present invention; Figure 6 It is a schematic diagram of the coordination state of the drive rod, synchronization block, synchronization rod, traction block and other structures in the present invention; Figure 7 It is a schematic diagram of the coordination state of the fixed structure, the driving structure, the connecting structure, the sliding frame and other structures in the present invention; Figure 8 For the present invention Figure 7 A magnified schematic diagram of the middle A area; Fig. 9 It is a structural schematic diagram of the connection structure in the present invention; In the figure: 1. trolley running mechanism, 2. manned cage, 3. connecting mechanism, 4. door frame, 5. 3t trolley, 6. 10t trolley, 7. control room, 8. hook, 9. safety box, 10. fixed pulley, 11. safety device, 12. guide wheel, 13. wire rope, 14. eccentric wheel, 15. synchronous rod, 16. synchronous block, 17. driving rod, 18. lifting block, 19. upper spring, 20. upper connecting rod, 21. synchronous crank, 22. lower connecting rod, 23. Sliding frame, 24, lower sliding rod, 25, lower top spring, 26, motor, 27, clutch telescopic rod, 28, movable pulley, 29, fan-shaped block, 30, upper sliding rod, 31, traction block, 32, fixed cylinder, 33, limit block, 34, rotating rod, 35, input bevel gear set, 36, first spline shaft, 37, sleeve, 38, active clutch block, 39, driven clutch block, 40, output bevel gear set, 41, fixed clutch block, 42, connecting clutch block, 43, second spline shaft. DETAILED DESCRIPTION

[0019] A safe and efficient shaft hoist, such as Figure 1-9 As shown, it includes a gantry, on which a 3t trolley is slidably connected; the output end of the 3t trolley is connected to a connecting mechanism, on which a manned cage is connected; the 3t trolley is connected to the manned cage through the connecting mechanism to achieve the up and down lifting of the manned cage; the gantry is provided with a trolley running mechanism, and the gantry is also provided with a control room; the gantry is also provided with a 10t trolley, and the output end of the 10t trolley is connected to a hook; heavy objects are lifted by the 10t trolley in combination with the hook.

[0020] The connecting mechanism includes a safety box connected to the manned cage, and the front and rear ends of the safety box are each provided with two sets of staggered fixed pulley blocks that cooperate with the wire rope of the 3t trolley; the wire rope that cooperates with the fixed pulley block on the outer side of the front end of the safety box is fixedly connected to the balance arm on the gantry on the left side, and is connected to the drum of the 3t trolley on the right side; the wire rope that cooperates with the fixed pulley block on the inner side of the front end of the safety box is fixedly connected to the balance arm on the gantry on the right side, and is connected to the drum of the 3t trolley on the left side; the wire rope that cooperates with the fixed pulley block on the outer side of the rear end of the safety box is fixedly connected to the balance arm on the gantry on the left side, and is connected to the drum of the 3t trolley on the right side; the wire rope that cooperates with the fixed pulley block on the inner side of the rear end of the safety box is fixedly connected to the balance arm on the gantry on the right side, and is connected to the drum of the 3t trolley on the left side; the two sets of fixed pulley blocks each include a pair of symmetrically arranged fixed pulleys that are rotatably connected to the safety box, and the safety box is provided with a safety device for synchronously fixing the vertical wire rope and the wire rope between the pair of fixed pulleys.

[0021] The safety device includes a sliding frame which is arranged between a pair of fixed pulleys and is slidably connected to a safety box, and a movable pulley which cooperates with a steel wire rope is rotatably connected to the sliding frame; a lower sliding rod which is slidably connected to the safety box is fixed to the sliding frame, and a lower top spring is sleeved on the lower sliding rod, and the lower top spring is arranged between the safety box and the sliding frame; a middle fixing structure which is slidably connected to the safety box and fixes the steel wire rope between the pair of fixed pulleys as the sliding frame rises is also slidably connected to the safety box, and a side fixing structure which fixes the vertical steel wire rope is also provided on the safety box, and the side fixing structure moves as the middle fixing structure moves.

[0022] When the safety device is in use, the wire rope passes through the fixed pulley, the movable pulley, and the fixed pulley and is then connected to the door frame and the drum of the 3t trolley. When the wire rope passes through the fixed pulley and the movable pulley to hoist the manned cage, the wire rope squeezes the movable pulley, so that the movable pulley drives the sliding frame to move downward along the safety box through the lower slide bar and squeezes the lower top spring; when one of the wire ropes breaks, since the present application cooperates with four sets of fixed pulley groups and four sets of wire ropes, the hoisting and lifting of the manned cage can be achieved; the other wire rope on the side of the broken wire rope can still be used to hoist the manned cage to maintain the stability of the manned cage; the broken wire rope is fixed by the middle fixed structure and the side fixed structure, which can effectively prevent the wire rope from being separated from the fixed pulley and swinging uncontrollably in the air to cause injuries to the staff in the manned cage.

[0023] When the steel wire ropes at the front or rear end of the safety box break at the same time, the squeezing pressure of the steel wire ropes on the movable pulley is reduced or disappears, and the sliding frame drives the movable pulley to rise under the action of the lower top spring, so that the middle fixed structure fixes the steel wire rope between a pair of fixed pulleys, and the side fixed structure fixes the vertical steel wire rope, thereby realizing multi-point fixation of the steel wire rope to avoid separation of the steel wire rope from the safety box, causing the safety box and the manned cage to tilt under the action of the steel wire rope at one end, and the overall weight of the manned cage falls completely on the remaining steel wire ropes, causing the remaining steel wire ropes to break in a chain reaction, which can effectively prevent the manned cage from overturning and improve the safety of the manned cage.

[0024] Furthermore, if Figure 5 and Figure 6 As shown, the middle fixed structure includes a fan-shaped block slidably connected to the sliding frame, the fan-shaped block is provided with a limit block cooperating with the sliding frame, and the fan-shaped block is provided with a fan-shaped tooth groove cooperating with the movable pulley; the fan-shaped block is fixedly connected to an upper sliding rod slidably connected to the safety box, the safety box is provided with an upper top spring sleeved on the upper sliding rod, and the upper top spring is arranged between the safety box and the fan-shaped block.

[0025] When the middle fixed structure is in use, when the sliding frame rises, under the action of the following synchronous crank, upper connecting rod and lower connecting rod, the fan-shaped block moves synchronously with the sliding frame. Under the action of the upper top spring, the fan-shaped block cooperates with the movable pulley through the fan-shaped tooth groove to fix the wire rope, thereby realizing the fixation of the wire rope between a pair of fixed pulleys.

[0026] Furthermore, if Figure 6As shown, the side fixing structure includes a fixing cylinder fixedly connected to the safety box, an eccentric wheel is rotatably connected to the fixing cylinder, fixing teeth for fixing the steel wire rope are arranged on the outer periphery of the eccentric wheel, and a force groove cooperating with the eccentric wheel is arranged on the fixing cylinder; as the middle fixing structure moves, the eccentric wheel rotates along the fixing cylinder, and the eccentric wheel fixes the steel wire rope through the fixing teeth cooperating with the force groove on the fixing cylinder; since the steel wire rope pulls the eccentric wheel upward, the fixing of the steel wire rope by the eccentric wheel is more stable.

[0027] Furthermore, the safety box is rotatably connected to a synchronization block, and the synchronization block is eccentrically rotatably connected to a driving rod; the upper sliding rod is fixedly connected to a lifting block, and the lifting block is rotatably connected to an end of the driving rod away from the synchronization block; the synchronization block is also eccentrically rotatably connected to a synchronization rod, and the synchronization rod is rotatably connected to a traction block fixed to an eccentric wheel; the synchronization block includes a driving part rotatably connected to the driving rod, and the driving part is connected to a synchronization part rotatably connected to the synchronization rod, and the driving part and the synchronization part are arranged at an angle.

[0028] When the upper slide bar slides along the safety box, the upper slide bar drives the lifting block to descend, and the lifting block drives the synchronous block to rotate along the safety box through the driving rod and the driving part; the synchronous block drives the traction block to move through the synchronization part and the synchronization rod, and the traction block drives the eccentric wheel to rotate to fix the wire rope.

[0029] Furthermore, in order to realize the synchronous movement of the sliding frame and the fan-shaped block, as Figure 3 As shown, a synchronous crank is rotatably connected to the safety box, and the center position of the synchronous crank is rotatably connected to the safety box; one end of the synchronous crank is rotatably connected to a lower connecting rod, and the other end of the lower connecting rod is rotatably connected to the sliding frame; the synchronous crank is also rotatably connected to an upper connecting rod, and the other end of the upper connecting rod is rotatably connected to a fan-shaped block on the middle fixed structure; when the sliding frame rises, the sliding frame drives the synchronous crank to rotate through the lower connecting rod, and the synchronous crank drives the fan-shaped block to slide down along the safety box through the upper connecting rod.

[0030] Furthermore, the safety box is rotatably connected to multiple guide wheel groups that respectively cooperate with the multiple steel ropes, and the multiple guide wheel groups each include a pair of guide wheels respectively arranged on both sides of the steel rope, and the axis of the guide wheel is arranged parallel to the axis of the movable pulley; the steel rope is guided by the guide wheel to improve the stability of the steel rope operation.

[0031] Furthermore, the safety box is provided with two sets of driving structures respectively cooperating with the fixed pulley groups at the front end and rear end of the safety box, and the pair of sliding frames at the front end of the safety box and the pair of sliding frames at the rear end are both connected with connecting structures, and the pair of sliding frames move synchronously through the connecting structure.

[0032] Furthermore, the driving structure includes a motor fixedly connected to the safety box, and the output end of the motor is fixedly connected to an input bevel gear set; the output end of the input bevel gear set is connected to a first spline shaft, and a first spline cylinder is slidably connected to the first spline shaft; an active clutch block is fixedly connected to the first spline cylinder, and a driven clutch block that cooperates with the active clutch block is rotatably connected to the safety box; the driven clutch block is connected to the output bevel gear set, and the output end of the output bevel gear set is fixedly connected to the synchronous crank; a clutch telescopic rod is fixedly connected to the safety box, and the telescopic end of the clutch telescopic rod is fixedly connected to a sleeve, and the first spline cylinder is rotatably connected to the sleeve; the clutch telescopic rod and the following connecting telescopic rod are preferably electric telescopic rods; the input bevel gear set and the output bevel gear set both include an input bevel gear and an output bevel gear meshing with the input bevel gear, the input bevel gear is the input end, and the output bevel gear is the output end.

[0033] When the driving structure is in use, the clutch telescopic rod is started, and the clutch telescopic rod drives the first spline cylinder to slide along the first spline shaft through the sleeve, and the first spline cylinder drives the active clutch block to engage with the driven clutch block; the motor is started, and the motor drives the input bevel gear group to move, and the input bevel gear group drives the first spline shaft to rotate, and the first spline shaft drives the driven clutch block to rotate through the first spline cylinder and the active clutch block, and the driven clutch block drives the output bevel gear group to move, and the output bevel gear group drives the synchronous crank to rotate, and the synchronous crank drives the upper connecting rod and the lower connecting rod to rotate, thereby driving the sliding frame and the fan-shaped block to move and separate or cooperate.

[0034] Further, the connecting structure includes a pair of rotating rods respectively rotatably connected to a pair of the sliding frames, and the pair of rotating rods are rotatably connected to each other; a pair of the sliding frames are fixedly connected to a second spline shaft, and a pair of the rotating rods are respectively rotatably connected to a pair of the second spline shafts; a pair of the spline shafts are slidably connected to a connecting clutch block, and a pair of the rotating rods are fixedly connected to a fixed clutch block that cooperates with the connecting clutch block.

[0035] When the driving structure needs to drive the inner sliding frame to descend, it is only necessary to drive the synchronous crank to rotate; when the driving structure needs to drive the outer sliding frame to descend, the connecting clutch block and the fixed clutch block can be engaged, so that the rotating rod can be relatively fixed with the sliding frame through the connecting clutch block, the fixed clutch block and the second spline shaft. When the inner sliding frame moves under the action of the driving structure, the inner sliding frame can drive the outer sliding frame to move through a pair of rotating rods, thereby realizing adjustment of the pair of sliding frames.

[0036] The working process of the present invention is: When the present invention is in use, when one of the steel wire ropes breaks, the present invention realizes the lifting and lowering of the manned cage by cooperating with the four sets of fixed pulleys and the four sets of steel wire ropes; the other steel wire rope on the side where the steel wire rope is broken can still lift the manned cage, thereby maintaining the stability of the manned cage; the broken steel wire rope is fixed by the middle fixing structure and the side fixing structure, which can effectively prevent the steel wire rope from being separated from the fixed pulley and swinging uncontrollably in the air to cause injuries to the staff in the manned cage.

[0037] When the steel wire rope at the front end or rear end of the safety box breaks at the same time, the squeezing pressure of the steel wire rope on the movable pulley is reduced or disappears, and the sliding frame drives the movable pulley to rise under the action of the lower top spring; the sliding frame drives the synchronous crank to rotate through the lower connecting rod, and the synchronous crank drives the fan-shaped block to move through the upper connecting rod, and under the action of the upper top spring, the fan-shaped block cooperates with the movable pulley through the fan-shaped tooth groove to fix the steel wire rope, thereby realizing the fixation of the steel wire rope between a pair of fixed pulleys.

[0038] At the same time, when the upper slide bar descends with the fan-shaped block, the upper slide bar drives the lifting block to descend, and the lifting block drives the synchronous block to rotate along the safety box through the driving rod and the driving part; the synchronous block drives the traction block to move through the synchronous part and the synchronous rod, and the traction block drives the eccentric wheel to rotate, and the eccentric wheel fixes the wire rope through the fixed teeth and the force groove on the fixed cylinder; under the action of the eccentric wheel, the wire rope pulls the eccentric wheel upward, so that the eccentric wheel fixes the wire rope more stably, and the eccentric wheel makes the fan-shaped block fix the wire rope more stably through the synchronous rod, the synchronous block, the driving rod, etc.

[0039] When it is necessary to loosen the fixed wire rope, and when the driving structure needs to drive the inner sliding frame to descend, the clutch telescopic rod is started, and the clutch telescopic rod drives the first spline cylinder to slide along the first spline shaft through the sleeve, and the first spline cylinder drives the active clutch block to engage with the driven clutch block; the motor is started, and the motor drives the input bevel gear group to move, and the input bevel gear group drives the first spline shaft to rotate, and the first spline shaft drives the driven clutch block to rotate through the first spline cylinder and the active clutch block, and the driven clutch block drives the output bevel gear group to move, and the output bevel gear group drives the synchronous crank to rotate, and the synchronous crank drives the upper connecting rod and the lower connecting rod to rotate, thereby driving the sliding frame and the fan-shaped block to move and separate.

[0040] When the driving structure needs to drive the outer sliding frame to descend, the connecting clutch block can be engaged with the fixed clutch block, so that the rotating rod can be kept relatively fixed with the sliding frame through the connecting clutch block, the fixed clutch block and the second spline shaft. When the inner sliding frame moves under the action of the driving structure, the inner sliding frame can drive the outer sliding frame to move through a pair of rotating rods.

Claims

1. A safe and efficient shaft hoist, characterized by: It comprises a gantry, on which a 3t trolley is slidably connected; the output end of the 3t trolley is connected to a connecting mechanism, on which a manned cage is connected; the connecting mechanism comprises a safety box connected to the manned cage, and the front and rear ends of the safety box are provided with two sets of staggered fixed pulley blocks that cooperate with the steel wire rope of the 3t trolley; the two sets of fixed pulley blocks each comprise a pair of symmetrically arranged fixed pulleys that are rotatably connected to the safety box, and the safety box is provided with a safety device for synchronously fixing the vertical steel wire rope and the steel wire rope between the pair of fixed pulleys; The safety device includes a sliding frame arranged between a pair of fixed pulleys and slidably connected to a safety box, and a movable pulley cooperating with a steel wire rope is rotatably connected to the sliding frame; a lower top spring cooperating with the sliding frame is provided on the safety box, and a middle fixing structure is also slidably connected to the safety box for fixing the steel wire rope between the pair of fixed pulleys as the sliding frame rises; the safety box is also provided with a side fixing structure for fixing the vertical steel wire rope, and the side fixing structure moves as the middle fixing structure moves.

2. The safe and efficient shaft hoist according to claim 1, characterized in that: The gantry is provided with a trolley running mechanism, and a control room is also provided on the gantry; the gantry is also provided with a 10t trolley, and the output end of the 10t trolley is connected with a hook.

3. The safe and efficient shaft hoist according to claim 1, characterized in that: The middle fixed structure includes a fan-shaped block slidably connected to the sliding frame, and the fan-shaped block is provided with a fan-shaped tooth groove cooperating with the movable pulley; the fan-shaped block is fixedly connected to an upper sliding rod slidably connected to the safety box, and the safety box is provided with an upper top spring sleeved on the upper sliding rod, and the upper top spring is arranged between the safety box and the fan-shaped block.

4. The safe and efficient shaft hoist according to claim 3, characterized in that: The side fixing structure includes a fixing cylinder fixedly connected to the safety box, an eccentric wheel is rotatably connected to the fixing cylinder, fixing teeth for fixing the wire rope are arranged on the outer periphery of the eccentric wheel, and a force bearing groove cooperating with the eccentric wheel is arranged on the fixing cylinder.

5. The safe and efficient shaft hoist according to claim 4, characterized in that: The safety box is rotatably connected with a synchronization block, and the synchronization block is eccentrically rotatably connected with a driving rod; the upper sliding rod is fixedly connected with a lifting block, and the lifting block is rotatably connected to an end of the driving rod away from the synchronization block; the synchronization block is also eccentrically rotatably connected with a synchronization rod, and the synchronization rod is rotatably connected with a traction block fixed to the eccentric wheel.

6. The safe and efficient shaft hoist according to claim 1, characterized in that: The safety box is rotatably connected with a synchronous crank, and the center position of the synchronous crank is rotatably connected to the safety box; one end of the synchronous crank is rotatably connected with a lower connecting rod, and the other end of the lower connecting rod is rotatably connected to the sliding frame; the synchronous crank is also rotatably connected with an upper connecting rod, and the other end of the upper connecting rod is rotatably connected to the middle fixed structure.

7. The safe and efficient shaft hoist according to claim 1, characterized in that: The safety box is rotatably connected to multiple guide wheel groups respectively cooperating with the multiple steel wire ropes, and the multiple guide wheel groups each include a pair of guide wheels respectively arranged on both sides of the steel wire rope, and the axis of the guide wheel is arranged parallel to the axis of the movable pulley.

8. The safe and efficient shaft hoist according to claim 6, characterized in that: The safety box is provided with two sets of driving structures respectively cooperating with the fixed pulley groups at the front end and the rear end of the safety box. The pair of sliding frames at the front end of the safety box and the pair of sliding frames at the rear end are both connected with connecting structures, and the pair of sliding frames move synchronously through the connecting structure.

9. The safe and efficient shaft hoist according to claim 8, characterized in that: The driving structure includes a motor fixedly connected to the safety box, and the output end of the motor is fixedly connected to an input bevel gear set; the output end of the input bevel gear set is connected to a first spline shaft, and a first spline cylinder is slidably connected to the first spline shaft; an active clutch block is fixedly connected to the first spline cylinder, and a driven clutch block that cooperates with the active clutch block is rotatably connected to the safety box; the driven clutch block is connected to the output bevel gear set, and the output end of the output bevel gear set is fixedly connected to the synchronous crank; a clutch telescopic rod is fixedly connected to the safety box, and a sleeve is fixedly connected to the telescopic end of the clutch telescopic rod, and the first spline cylinder is rotatably connected to the sleeve.

10. The safe and efficient shaft hoist according to claim 9, characterized in that: The connection structure includes a pair of rotating rods that are respectively rotatably connected to a pair of sliding frames, and the pair of rotating rods are rotatably connected to each other; a pair of sliding frames are fixedly connected to a second spline shaft, and a pair of rotating rods are respectively rotatably connected to a pair of second spline shafts; a pair of spline shafts are slidably connected to a connecting clutch block, and a pair of rotating rods are fixedly connected to a fixed clutch block that cooperates with the connecting clutch block.

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