Chain block chain rotation accelerator

Abstract

The utility model provides a chain block chain rotation accelerator which comprises a handle, a power shaft and a shell, the power shaft is connected to the handle, the power shaft is rotationally connected to the shell, a first gear is fixedly connected to the power shaft, a supporting shaft is rotationally connected into the shell, and a second gear is fixedly connected to the supporting shaft. The supporting shaft is connected with a third gear and a second gear meshed with the first gear, a driven shaft used for being fixedly connected with the chain wheel is rotationally connected into the shell, the driven shaft is connected with a driven gear, the third gear is meshed with the driven gear, and the outer diameter of the first gear is larger than that of the second gear. The outer diameter of the third gear is larger than the outer diameter of the second gear and the outer diameter of the driven gear, under the condition that the power shaft rotates by one circle, the chain wheel can rotate by multiple circles, the speed of the chain block is increased, the steam ventilation door is rapidly opened, safe escape of a tunnel under the conditions of serious emergencies, especially fire disasters is promoted, and the purpose of improving practicability is achieved.

Description

Technical Field

[0001] This utility model relates to hand chain hoists, and more particularly, to a chain rotation accelerator for hand chain hoists. Background Technology

[0002] Currently, Chinese patent CN207108326U discloses a hand-operated chain hoist, including a shell, a hand-operated structure, a handwheel, a mounting frame, a connecting through hole, a fixing bolt, a chain, a hook structure, and a pull ring. The mounting frame is fixed to the upper part of the shell; the connecting through hole is horizontally opened on the upper left and right sides of the mounting frame; and the fixing bolt passes through the connecting through hole.

[0003] The inclusion of pressure sensors facilitates the detection of the weight of the hoisted object, preventing excessive weight from breaking the chain. Multiple fixing straps facilitate the secure attachment of objects without lifting rings, enhancing ease of use. A return spring at the connection between the return plate and the hook ensures easy plate reset and prevents the hoisted object from falling. The curved outer side of the protrusion facilitates the insertion of the extension rod into the groove. The mesh-like anti-slip texture on the anti-slip sleeve improves grip and comfort.

[0004] In operation, the hand lever drives the handwheel to rotate, achieving chain transmission. However, one rotation of the hand lever corresponds to one rotation of the handwheel. In the event of a power outage at the tunnel access gate, rapid opening of the gate is required, and this type of hand lever chain hoist is clearly unsuitable, making it impractical. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a chain rotation accelerator for a hand chain hoist, which increases the speed of the hand chain hoist, quickly opens the ventilation door, and improves the safety of tunnel escape in case of emergencies, especially fire, thereby improving its practicality.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is: a chain rotation accelerator for a hand chain hoist, comprising a handle, a power shaft, and a housing. The power shaft is connected to the handle and rotatably connected to the housing. A first gear is fixedly connected to the power shaft. A support shaft is rotatably connected inside the housing. A third gear and a second gear meshing with the first gear are connected to the support shaft. A driven shaft for fixed connection with a sprocket is rotatably connected inside the housing. A driven gear is connected to the driven shaft. The third gear meshes with the driven gear. The outer diameter of the first gear is larger than the outer diameter of the second gear, and the outer diameter of the third gear is larger than the outer diameters of the second gear and the driven gear.

[0007] To achieve the above technical solution, the handle drives the power shaft to rotate, which in turn drives the first gear to rotate. The first gear then drives the second gear to rotate, which in turn drives the third gear to rotate via the support shaft. The third gear then drives the driven gear to rotate, which in turn drives the sprocket to rotate via the driven shaft. Therefore, when the handle drives the power shaft to rotate one revolution, the power shaft can drive the sprocket to rotate more than one revolution, thereby increasing the speed of the hand chain hoist, quickly opening the ventilation door, improving the safety of tunnel escape in emergencies, especially in the event of a fire, and achieving the goal of improving practicality.

[0008] In a preferred embodiment of this utility model, the third gear meshes with the driven gear through an acceleration component.

[0009] The above technical solution enables the driven gear to rotate faster when the third gear rotates, thereby further improving its practicality.

[0010] In a preferred embodiment of this utility model, the acceleration assembly includes an acceleration shaft, a fourth gear, and a fifth gear. The acceleration shaft is rotatably connected to the housing. The fourth gear and the fifth gear are fixed on the acceleration shaft. The fourth gear meshes with the third gear, and the fifth gear meshes with the driven gear. The outer diameter of the fifth gear is larger than the outer diameters of the fourth gear and the driven gear, and the outer diameter of the third gear is larger than the outer diameter of the fourth gear.

[0011] To achieve the above technical solution, the third gear drives the fourth gear to rotate, the fourth gear drives the fifth gear to rotate through the acceleration shaft, and the fifth gear drives the driven gear to rotate. This results in the driven gear rotating more than one revolution when the third gear rotates one revolution, thereby further improving the speed of the driven gear and enhancing its practicality.

[0012] As a preferred embodiment of this utility model, a limiting gear is fixedly connected to the outer wall of the power shaft, and a safety component for limiting the unidirectional rotation of the limiting gear is provided on the inner wall of the housing.

[0013] To achieve the above technical solution, since the driven shaft rotates at a relatively high speed when the power shaft rotates, it is easy to cause a safety accident if the handle is accidentally touched and the power shaft rotates in the wrong direction. Therefore, a safety component is used to restrict the unidirectional rotation of the power shaft in order to reduce the possibility of safety accidents.

[0014] In a preferred embodiment of this utility model, the safety assembly includes an adjusting shaft, a protrusion, a first elastic element, a second elastic element, a first locking plate, and a second locking plate. The adjusting shaft is rotatably connected to the outer casing, and the protrusion is fixed to the adjusting shaft. One end of each of the first and second locking plates is hinged to the inner wall of the outer casing, and the other end is used to abut against the limiting gear to make the limiting gear rotate in one direction. Both ends of the first elastic element are connected to the inner wall of the outer casing and the first locking plate, respectively. Both ends of the second elastic element are connected to the inner wall of the outer casing and the second locking plate, respectively. The protrusion is located between the first and second locking plates and is used to push the first locking plate to separate from the limiting gear or to push the second locking plate to separate from the limiting gear.

[0015] To achieve the above technical solution, the adjusting shaft is rotated, causing the protrusion to rotate along the axis of the adjusting shaft and push the first clamping plate, causing the first clamping plate to separate from the limiting gear. The second clamping plate is then pressed against the limiting gear by the elastic force of the second elastic element. At this time, the adjusting shaft can only rotate in the forward direction. Similarly, when the protrusion pushes the second clamping plate to separate from the limiting gear, the adjusting shaft can only rotate in the reverse direction, thereby achieving the safety function.

[0016] As a preferred embodiment of this utility model, the handle includes a horizontal bar and a vertical bar. A connecting sleeve is fixedly connected to the horizontal bar, and a fixing bolt is threaded through the connecting sleeve. The fixing bolt passes through the power shaft and is threadedly connected to a locking sleeve. The vertical bar is fixed to the end of the horizontal bar away from the connecting sleeve.

[0017] To achieve the above technical solution, the horizontal bar configuration increases the power arm between the vertical bar and the power shaft, making it easier for the vertical bar to drive the power shaft to rotate via the horizontal bar. At the same time, by passing the fixing bolt through the power shaft and connecting it to the locking sleeve threadedly, the ease of installation is improved.

[0018] In a preferred embodiment of this utility model, a bracket is fixedly connected to the bottom wall of the outer shell, the bracket is slidably connected to a support, the support is located below the bracket, and the support is connected to the bracket through a lifting assembly.

[0019] To achieve the above technical solution, the support is slidably connected to the base by a lifting component, so that the height of the handle can be adapted to workers of different heights, and can also be adapted to chains of different heights, thus improving practicality.

[0020] In a preferred embodiment of this utility model, the lifting assembly includes a rack, a drive gear, a worm, and a worm wheel. The rack is fixed to the outer wall of the bracket, and the length direction of the rack is parallel to the length direction of the bracket. The worm is rotatably connected to the support, and a rotating shaft is rotatably connected to the support. The worm wheel is fixed to the rotating shaft and meshes with the worm. The drive gear is fixed to the rotating shaft and meshes with the rack.

[0021] To achieve the above technical solution, the worm rotates, which drives the worm wheel to rotate. The worm wheel drives the gear to rotate through the rotating shaft. The gear causes the bracket to slide along the support through the rack. The bracket is positioned by the self-locking property between the worm and the worm wheel. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the external structure of this utility model;

[0023] Figure 2 To illustrate the structure of the driven shaft;

[0024] Figure 3 To illustrate the structural diagram of the insurance component;

[0025] Figure 4 To illustrate the structural diagram of the support frame;

[0026] Figure 5 This is a schematic diagram illustrating the structure of the lifting assembly.

[0027] Reference numerals: 1. Drive shaft; 2. Handle; 3. Horizontal bar; 4. Vertical bar; 5. Connecting sleeve; 6. Fixing bolt; 7. Locking sleeve; 8. Housing; 9. First gear; 10. Support shaft; 11. Second gear; 12. Third gear; 13. Driven shaft; 14. Driven gear; 15. Acceleration assembly; 16. Acceleration shaft; 17. Fourth gear; 18. Fifth gear; 19. Safety assembly; 20. Adjusting shaft; 21. Protrusion; 22. First elastic element; 23. Second elastic element; 24. First locking plate; 25. Second locking plate; 26. Limiting gear; 27. Bracket; 28. Support plate; 29. ​​Slide rod; 30. Support; 31. Lifting assembly; 32. Rack; 33. Drive gear; 34. Worm gear; 35. Worm wheel; 36. Handrail; 37. Rotating shaft. Detailed Implementation

[0028] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, so that the technical solution of this utility model can be more easily understood and mastered.

[0029] A chain rotation accelerator for a hand chain hoist includes a handle 2, a drive shaft 1, and a housing 8. The drive shaft 1 is connected to the handle 2 and rotatably connected to the housing 8, and is horizontally positioned. The handle 2 includes a horizontal bar 3 and a vertical bar 4. A cylindrical connecting sleeve 5 is fixedly connected to the end of the horizontal bar 3. A fixing bolt 6 passes through the connecting sleeve 5, passes through the drive shaft 1, and is threadedly connected to a locking sleeve 7 to achieve a fixed connection between the connecting sleeve 5 and the drive shaft 1. The vertical bar 4 is fixed to the end of the horizontal bar 3 away from the connecting sleeve 5, and the vertical bar 4 and the horizontal bar 3 are arranged in an L-shape.

[0030] A first gear 9 is fixedly connected to the power shaft 1, and the first gear 9 is coaxially arranged with the power shaft 1. A support shaft 10 located above the power shaft 1 is rotatably connected inside the housing 8, and the axis of the support shaft 10 is parallel to the axis of the power shaft 1. A second gear 11 and a third gear 12 are fixedly connected to the support shaft 10. The second gear 11 meshes with the first gear 9.

[0031] A driven shaft 13 is rotatably connected to the top of the housing 8. A sprocket is fixedly connected to the end of the driven shaft 13. The sprocket is located outside the housing 8 and is coaxial with the driven shaft 13. The axis of the driven shaft 13 is parallel to the axis of the power shaft 1. A driven gear 14 is fixedly connected to the driven shaft 13. The axis of the driven gear 14 is coaxial with the axis of the driven shaft 13.

[0032] The third gear 12 meshes with the driven gear 14 via the acceleration assembly 15.

[0033] The acceleration assembly 15 includes an acceleration shaft 16, a fourth gear 17, and a fifth gear 18. The acceleration shaft 16 is rotatably connected inside the housing 8 and is located between the driven shaft 13 and the power shaft 1. The axis of the acceleration shaft 16 is parallel to the axis of the power shaft 1. The fourth gear 17 and the fifth gear 18 are fixed to the acceleration shaft 16. The fourth gear 17 meshes with the third gear 12, and the fifth gear 18 meshes with the driven gear 14.

[0034] The outer diameters of the second gear 11, the fourth gear 17, and the driven gear 14 are equal; the outer diameters of the first gear 9, the third gear 12, and the fifth gear 18 are equal, with the outer diameter of the first gear 9 being twice that of the second gear 11. The power shaft 1, the driven shaft 13, the support shaft 10, and the acceleration shaft 16 are all rotatably connected to the housing 8 via bearings.

[0035] To prevent accidental contact with the power shaft 1 and the resulting safety accident, a limiting gear 26 is fixedly connected to the outer wall of the power shaft 1, and a safety component 19 for limiting the unidirectional rotation of the limiting gear 26 is provided on the inner wall of the housing 8.

[0036] The safety assembly 19 includes an adjusting shaft 20, a protrusion 21, a first elastic element 22, a second elastic element 23, a first locking plate 24, and a second locking plate 25. The adjusting shaft 20 is rotatably connected to the housing 8, located below the power shaft 1, and its axis is parallel to the axis of the power shaft 1. Both the first locking plate 24 and the second locking plate 25 are hinged at one end to the inner wall of the housing 8, and their other ends are used to abut against the limiting gear 26 to allow the limiting gear 26 to rotate unidirectionally. Both the first locking plate 24 and the second locking plate 25 are inclined. The two ends of the first elastic element 22 are connected to the inner wall of the housing 8 and the first locking plate 24, respectively, and the two ends of the second elastic element 23 are connected to the inner wall of the housing 8 and the second locking plate 25, respectively. Both the first elastic element 22 and the second elastic element 23 are springs.

[0037] The protrusion 21 is located between the first card plate 24 and the second card plate 25 and is used to push the first card plate 24 to separate from the limiting gear 26 or to push the second card plate 25 to separate from the limiting gear 26.

[0038] Damping ester is applied between the outer wall of the adjusting shaft 20 and the outer casing 8 to prevent the protrusion 21 from rotating arbitrarily along the axis of the adjusting shaft 20, thereby improving structural stability.

[0039] Rotating the adjusting shaft 20 causes the protrusion 21 to rotate along the axis of the adjusting shaft 20. After the protrusion 21 separates from the second clamping plate 25, it pushes the first clamping plate 24, causing the first clamping plate 24 to separate from the limiting gear 26. The elastic force of the second elastic element 23 then causes the second clamping plate 25 to abut against the limiting gear 26. At this time, the adjusting shaft 20 can only rotate in the forward direction. Similarly, when the protrusion 21 pushes the second clamping plate 25 to separate from the limiting gear 26, the protrusion 21 separates from the first clamping plate 24. The elastic force of the first elastic element 22 then causes the first clamping plate 24 to abut against the limiting gear 26, causing the adjusting shaft 20 to rotate only in the reverse direction, thus achieving a safety function.

[0040] A bracket 27 is fixedly connected to the bottom wall of the outer casing 8. The bracket 27 includes a support plate 28 and a slide rod 29 fixed below the support plate 28. The outer casing 8 is fixed to the support plate 28. The slide rod 29 has a square cross-section and is slidably connected to a support 30 located below the bracket 27. The support 30 is connected to the bracket 27 via a lifting assembly 31.

[0041] The lifting assembly 31 includes a rack 32, a drive gear 33, a worm 34, and a worm wheel 35. The rack 32 is fixed to the outer wall of the slide rod 29, and its length is parallel to that of the slide rod 29. The worm 34 is rotatably connected to a support 30, and a rotating shaft 37 is rotatably connected to the support 30. The worm wheel 35 is fixed to the rotating shaft 37 and meshes with the worm 34. The drive gear 33 is fixed to the rotating shaft 37 and meshes with the rack 32. The worm wheel 35, drive gear 33, and rotating shaft 37 are coaxially arranged.

[0042] A handle 36 is fixedly connected to the end of the worm 34 to facilitate the rotation of the worm 34.

[0043] Of course, the above are just typical examples of this utility model. In addition, this utility model may have many other specific implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed by this utility model.

Claims

1. A chain hoist chain rotation accelerator, comprising a handle (2), a power shaft (1) and a housing (8), the power shaft (1) being connected to the handle (2), the power shaft (1) being rotationally connected to the housing (8), characterized in that: The power shaft (1) is fixedly connected with a first gear (9), the shell (8) is rotatably connected with a supporting shaft (10), the supporting shaft (10) is connected with a third gear (12) and a second gear (11) engaged with the first gear (9), the shell (8) is rotatably connected with a driven shaft (13) for fixedly connecting with a sprocket, the driven shaft (13) is connected with a driven gear (14), the third gear (12) is engaged with the driven gear (14), the outer diameter of the first gear (9) is greater than the outer diameter of the second gear (11), and the outer diameter of the third gear (12) is greater than the outer diameters of the second gear (11) and the driven gear (14). ​ 2. A chain hoist chain rotation accelerator according to claim 1, characterized in that: The third gear (12) is engaged with the driven gear (14) through an acceleration assembly (15).

3. A chain hoist chain rotation accelerator according to claim 2, characterized in that: The acceleration assembly (15) comprises an acceleration shaft (16), a fourth gear (17) and a fifth gear (18), the acceleration shaft (16) is rotatably connected in the shell (8), the fourth gear (17) and the fifth gear (18) are fixed on the acceleration shaft (16), the fourth gear (17) is engaged with the third gear (12), the fifth gear (18) is engaged with the driven gear (14), the outer diameter of the fifth gear (18) is greater than the outer diameters of the fourth gear (17) and the driven gear (14), and the outer diameter of the third gear (12) is greater than the outer diameter of the fourth gear (17).

4. A chain hoist according to claim 1 or 2 or 3, characterized in that: The outer wall of the power shaft (1) is fixedly connected with a limiting gear (26), and the inner wall of the shell (8) is provided with an insurance assembly (19) for limiting the one-way rotation of the limiting gear (26).

5. A chain hoist chain rotation accelerator according to claim 4, characterized in that: The insurance assembly (19) comprises an adjusting shaft (20), a protrusion (21), a first elastic member (22), a second elastic member (23), a first clamping plate (24) and a second clamping plate (25), the adjusting shaft (20) is rotatably connected to the shell (8), the protrusion (21) is fixed to the adjusting shaft (20), the first clamping plate (24) and the second clamping plate (25) are both hingedly connected to the inner wall of the shell (8) at one end and abut against the limiting gear (26) at the other end to enable the one-way rotation of the limiting gear (26), the two ends of the first elastic member (22) are connected to the inner wall of the shell (8) and the first clamping plate (24) respectively, the two ends of the second elastic member (23) are connected to the inner wall of the shell (8) and the second clamping plate (25) respectively, and the protrusion (21) is located between the first clamping plate (24) and the second clamping plate (25) and is used for pushing the first clamping plate (24) away from the limiting gear (26) or pushing the second clamping plate (25) away from the limiting gear (26).

6. The chain hoist chain rotation accelerator of claim 1, wherein: The handle (2) comprises a cross rod (3) and a vertical rod (4), the cross rod (3) is fixedly connected with a connecting sleeve (5), the connecting sleeve (5) is provided with a fixing bolt (6) penetrating therethrough, the fixing bolt (6) penetrates through the power shaft (1) and is threadedly connected with a locking sleeve (7), and the vertical rod (4) is fixed to one end of the cross rod (3) away from the connecting sleeve (5).

7. The chain hoist chain rotation accelerator of claim 1, wherein: The bottom wall of the shell (8) is fixedly connected with a support (27), the support (27) is slidingly connected to a support base (30), the support base (30) is located below the support (27), and the support base (30) is connected with the support (27) through a lifting assembly (31).

8. A chain hoist chain rotation accelerator according to claim 7, characterized in that: The lifting assembly (31) comprises a rack (32), a power gear (33), a worm (34) and a worm wheel (35), the rack (32) is fixed to the outer wall of the support (27), the length direction of the rack (32) is parallel to the length direction of the support (27), the worm (34) is rotatably connected to the support base (30), the support base (30) is rotatably connected with a rotating shaft (37), the worm wheel (35) is fixed to the rotating shaft (37) and meshes with the worm (34), and the power gear (33) is fixed to the rotating shaft (37) and meshes with the rack (32).

Images