A lifting machine

Abstract

The present invention belongs to the technical field of material transfer, and specifically relates to a hoist, which includes a frame and a lifting seat, the frame is provided with a driving assembly for driving the lifting seat to perform lifting and lowering movements relative to the frame, a screw lifting mechanism is provided between the driving assembly and the lifting seat, and the screw lifting mechanism includes a coaxially arranged outer hollow fixed shaft, an inner hollow fixed shaft, an intermediate movable shaft and a transmission screw; the transmission screw is rotatably assembled between the outer hollow fixed shaft and the inner hollow fixed shaft, and is transmission-connected with the driving assembly; the intermediate movable shaft is slidingly sealed with the outer hollow fixed shaft and the inner hollow fixed shaft, and a slider located in the outer hollow fixed shaft and matched with the transmission screw thread is fixed on the intermediate movable shaft; the lifting seat is fixed on the intermediate movable shaft to be lifted and lowered between the outer hollow fixed shaft and the inner hollow fixed shaft with the intermediate movable shaft. The present invention has high lifting accuracy, high positioning accuracy and high lifting stability.

Description

Technical Field

[0001] The invention belongs to the technical field of material transfer, and in particular relates to an elevator. Background Art

[0002] Elevators are mechanical equipment that transport materials by changing potential energy. They are widely used in factories, warehouses, granaries and other places to transport materials from low to high.

[0003] At present, the most widely used hoist is the chain hoist, such as a chain hoist disclosed in the Chinese patent with authorization announcement number CN212151470U, which includes a frame, a motor base welded to the top of the frame, a motor fixed to the motor base, an output shaft of the motor connected to a connecting rod 1 through a latch, connecting rod 1 is connected to a sprocket 1 through a key, sprocket 1 is connected to a sprocket 2 through a chain 1, sprocket 2 is fixedly connected to connecting rod 2, and the middle of connecting rod 2 is connected to sprocket 3 through a key; a support block is connected to the other side of the upper end of the top plate through bolts, and a bearing support is connected to the top of the support block through bolts; the sprocket 3 is connected to the sprocket 4 through the chain 2, the sprocket 4 is connected to the connecting rod 4 through a key, the connecting rod 4 is connected to the bearing support by rotation, and the bottom end of the bearing support is connected to the bottom plate 1 through bolts; a chain fixing seat is fixedly connected to the middle of one side of the chain 2, and the chain fixing seat is connected to a storage rack through bolts. Before the chain hoist is put into operation, the object to be lifted is placed on the rack, and the motor is turned on. The motor drives the sprocket wheel four to rotate, thereby moving the chain two and driving the rack to rise and fall.

[0004] It can be seen from the above disclosed prior art that chain hoists are mostly driven by motors to rotate sprockets, which drive the chain meshed on the sprockets to move when the sprockets rotate, and then drive the objects to be lifted or lowered. However, the chain will have a certain elasticity during movement, which may cause the running trajectory of the hook to be not completely straight, affecting the lifting accuracy; in addition, after long-term use, the link part of the chain may be worn and the edge length may increase, resulting in an increase in the overall chain length, which causes looseness. In actual use, the movement distance of the chain will deviate, and the lifting stroke accuracy is low. Summary of the invention

[0005] The invention provides a hoist to solve the technical problem that the hoisting precision of the existing chain hoist is low.

[0006] In order to solve the above problems, the hoist provided by the present invention adopts the following technical solutions:

[0007] A hoist, comprising a frame and a lifting seat, the lifting seat is used to place materials, a driving assembly is arranged on the frame, the driving assembly is used to drive the lifting seat to move up and down relative to the frame, a screw lifting mechanism is arranged between the driving assembly and the lifting seat, the screw lifting mechanism comprises an outer hollow fixed shaft, an inner hollow fixed shaft, an intermediate movable shaft and a transmission screw arranged coaxially;

[0008] The outer hollow fixed shaft is fixedly mounted on the frame;

[0009] The inner hollow fixed shaft is used to be fixed on the ground;

[0010] The transmission screw is rotatably assembled between the outer hollow fixed shaft and the inner hollow fixed shaft, and is transmission-connected with the driving assembly;

[0011] The intermediate movable shaft is located inside the outer hollow fixed shaft and is sleeved outside the inner hollow fixed shaft. The intermediate movable shaft is slidingly sealed and anti-rotationally matched with the outer hollow fixed shaft and the inner hollow fixed shaft. A slider is fixed on the intermediate movable shaft, which is located inside the outer hollow fixed shaft and matched with the transmission screw thread. The slider is slidingly sealed with the outer hollow fixed shaft. The lifting seat is fixed on the intermediate movable shaft to be raised and lowered between the outer hollow fixed shaft and the inner hollow fixed shaft along with the intermediate movable shaft.

[0012] The beneficial effects of the present invention are as follows: the present invention adopts a screw lifting mechanism to realize the uniform and stable lifting of the lifting seat, the positioning accuracy within the lifting seat stroke is high and more stable, the lifting distance of the lifting seat is easy to control more accurately, and the lifting accuracy is high; under the self-locking effect of the thread, there is no need to set a corresponding anti-falling structure. In addition, the present invention adopts a coaxial structural arrangement of the inner, middle and outer three axes to ensure the stability and safety of material lifting.

[0013] Furthermore, an outer flange is coaxially provided at the lower end of the outer hollow fixed shaft, a center flange is coaxially provided at the lower end of the intermediate movable shaft, a first sealing connection disk is coaxially connected to the lower end of the outer flange, the intermediate movable shaft passes through the first sealing connection disk and is slidingly sealed with the first sealing connection disk; a second sealing connection disk is coaxially connected to the lower end of the center flange, the inner hollow fixed shaft passes through the second sealing connection disk and the second sealing connection disk is slidingly sealed with the inner hollow fixed shaft.

[0014] Beneficial effect: During the movement of the intermediate movable shaft, the first sealing connection plate, the second sealing connection plate and the slider realize sealing cooperation with the outer hollow fixed shaft and the inner hollow fixed shaft, thereby ensuring the stable movement of the intermediate movable shaft; in addition, the first sealing connection plate and the second sealing connection plate also ensure the centering of the intermediate movable shaft, thereby avoiding the displacement of the position of the intermediate movable shaft.

[0015] Furthermore, an upper limit component for limiting the rising stroke of the lifting seat is installed on the first sealing connection plate, and a lower limit component for limiting the descending stroke of the lifting seat is installed on the inner hollow fixed shaft.

[0016] Beneficial effect: The lifting position of the lifting seat can be accurately controlled to avoid the material being transported too far and causing the material to collide with related structures.

[0017] Furthermore, the upper limit component and the lower limit component are both limit switches.

[0018] Beneficial effect: When triggered, the limit switch can quickly transmit an electrical signal to stop the lifting of the lifting seat, ensuring the accuracy and safety of the operating position of the lifting seat.

[0019] Furthermore, a crank arm is fixed on the outer flange, and a plug rod parallel to the transmission screw is connected to the crank arm. A sleeve is provided on the lifting seat. When the lifting seat triggers the upper limit component during the rising process, the plug rod is plugged into and matched with the sleeve.

[0020] Furthermore, the lifting seat sleeve is arranged outside the intermediate movable shaft and pressed on top of the center flange. An upper pressure ring plate is coaxially arranged outside the intermediate movable shaft. The upper pressure ring plate is connected to the lifting seat. The outer diameter of the upper pressure ring plate is larger than the outer diameter of the first sealing connection plate so that the upper pressure ring plate can contact the upper limit component.

[0021] Beneficial effects: on the one hand, it is convenient to assemble the lifting seat and the intermediate movable shaft; on the other hand, the upper pressure ring plate ensures that the lifting seat can contact the upper limit component when rising.

[0022] Furthermore, the lifting seat includes a detachably connected support seat body and a connecting shell, and the connecting shell is sleeved outside the intermediate movable shaft; the support seat body includes two fork arms arranged in parallel and spaced apart in the front-to-back direction for plugging and cooperating with the material, and each fork arm is provided with a left limit stop and a right limit stop for limiting the left and right positions of the material, and the distance between the left limit stop and the right limit stop is adjustable.

[0023] Beneficial effects: The lifting seat is easy to assemble, and the lifting seat can also lift materials of different sizes, thereby increasing the application range of the lifting seat.

[0024] Furthermore, the drive assembly includes a motor and a transmission mechanism arranged between the motor and the transmission screw, a drive assembly mounting frame is fixed on the frame, the drive assembly mounting frame includes a connecting plate, a sleeve fixed vertically to the connecting plate, a bottom flange coaxially connected to the bottom end of the sleeve, and a motor mounting plate vertically connected to the connecting plate, a mounting opening for the power supply to pass through is provided on the connecting plate between the motor mounting plate and the sleeve, and the motor is fixed on the motor mounting plate; the sleeve is coaxially arranged with the transmission screw, and a plurality of evenly distributed reinforcing plates are connected in the circumferential direction of the sleeve, and the reinforcing plates are connected to the connecting plate and the bottom flange.

[0025] Beneficial effects: The structure is stable and compact, which saves the installation space occupied by the drive components on the frame and reduces the size of the entire elevator.

[0026] Furthermore, the transmission mechanism is a sprocket chain transmission mechanism, including a driving sprocket, a driven sprocket and a transmission chain meshed between the driving sprocket and the driven sprocket, the transmission screw is coaxially connected to the driven sprocket, the driven sprocket is located above the sleeve, and the transmission screw passes through the sleeve.

[0027] Furthermore, a clamp is coaxially provided on the outer hollow fixed shaft, and the clamp includes two semi-annular clamp bodies detachably connected together, and the semi-annular clamp body is detachably connected to the bottom flange.

[0028] Beneficial effects: the outer hollow fixed shaft can be clamped to prevent it from being deformed, and at the same time it is beneficial to ensure the coaxiality between the outer hollow fixed shaft and the intermediate movable shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0030] Figure 1 The three-dimensional structure of the elevator of the present invention is shown in FIG. Figure 1 (Showing that the lifting seat is at the upper limit travel position);

[0031] Figure 2 The three-dimensional structure of the elevator of the present invention is shown in FIG. Figure 2 (Showing that the lifting seat is at the lower limit travel position);

[0032] Figure 3 It is a schematic diagram of the frame of the hoist of the present invention and the mounting structure thereon (the material and the operating box are not shown);

[0033] Figure 4 for Figure 3 A top view of

[0034] Figure 5 for Figure 3 AA section view;

[0035] Figure 6 for Figure 5 The enlarged schematic diagram of point A in the middle;

[0036] Figure 7 This is a schematic diagram for installing the drive assembly;

[0037] Figure 8 It is a schematic diagram of the structure of the drive component mounting frame;

[0038] Fig. 9 It is a structural schematic diagram of an outer hollow fixed shaft;

[0039] Fig.10 It is a structural schematic diagram of the intermediate movable shaft;

[0040] Fig.11 It is a structural schematic diagram of the lifting seat;

[0041] Fig.12 It is a schematic diagram of the structure of the clamp.

[0042] Description of reference numerals:

[0043] 1. Frame; 2. Lifting seat; 3. Suspension control box; 4. Operation box; 5. Outer hollow fixed shaft; 6. Intermediate movable shaft; 7. Inner hollow fixed shaft; 8. Outer flange; 9. Center flange; 10. First sealing connection plate; 11. Second sealing connection plate; 12. Transmission screw; 13. Upper limit switch; 14. Lower limit switch; 15. Slider; 16. Motor; 17. Driving sprocket; 18. Driven sprocket; 19. Transmission chain; 20. Drive assembly mounting frame; 21. Connecting plate; 22. Sleeve Cylinder; 23, bottom flange; 24, motor mounting plate; 25, mounting port; 26, reinforcement plate; 27, support seat; 28, connecting shell; 29, clamp; 30, semi-annular clamp; 31, fork arm; 32, left limit stop; 33, right limit stop; 34, outer connecting disc; 35, center connecting disc; 36, adjusting nut; 37, adjusting rod; 38, material; 39, trolley; 40, upper pressure ring plate; 41, crank arm; 42, plug rod; 43, plug sleeve; 44, support ear plate. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0045] The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0046] Embodiment 1 of the hoist provided by the present invention:

[0047] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a hoist includes a frame 1, a driving assembly, a suspension control box 3, an operating box 4 and a hoisting seat 2, and the hoisting seat 2 is used to place materials 38.

[0048] The frame 1 includes a rectangular parallelepiped frame fixed on the ground and two connecting beams connected to the top of the frame and arranged in parallel and spaced apart from each other. The bottom of the two connecting beams is fixed with a drive assembly mounting frame 20. The drive assembly includes a motor 16 and a screw lifting mechanism arranged between the motor 16 and the lifting seat 2. The motor 16 realizes the lifting and lowering movement of the lifting seat 2 relative to the frame through the screw lifting mechanism.

[0049] Specifically, Figure 8 As shown, the drive assembly mounting frame 20 includes a connecting plate 21, a sleeve 22 vertically fixed to the connecting plate 21, a bottom flange 23 coaxially connected to the bottom end of the sleeve 22, and a motor mounting plate 24 vertically connected to the connecting plate 21. The motor mounting plate 24 is located on the left side of the sleeve 22. The connecting plate 21 is provided with a mounting opening 25 for the power supply to pass through at a position between the motor mounting plate 24 and the sleeve 22. The motor 16 is a reduction motor capable of forward and reverse rotation. The motor 16 is arranged at the above-mentioned mounting opening 25 and is fixed to the motor mounting plate 24. The output shaft of the motor 16 is located above the connecting plate 21. A plurality of uniformly distributed reinforcing plates 26 are connected in the circumferential direction of the sleeve 22. The reinforcing plates 26 are connected to the connecting plate 21 and the bottom flange 23. The drive assembly mounting frame 20 has high structural strength, compact structure, and small space occupation.

[0050] In this embodiment, the screw lifting mechanism is located in the above-mentioned frame, and includes a coaxially arranged outer hollow fixed shaft 5, an inner hollow fixed shaft 7, an intermediate movable shaft 6 and a transmission screw 12. The outer hollow fixed shaft 5, the inner hollow fixed shaft 7 and the intermediate movable shaft 6 are all hollow shafts, the inner diameter of the outer hollow fixed shaft 5 is larger than the outer diameter of the intermediate movable shaft 6, the inner diameter of the intermediate movable shaft 6 is larger than the outer diameter of the inner hollow fixed shaft 7, the intermediate movable shaft 6 is located inside the outer hollow fixed shaft 5 and sleeved outside the inner hollow fixed shaft 7, and the intermediate movable shaft 6 and the outer hollow fixed shaft 5 are anti-rotationally assembled by a keyway and a key. Fig. 9 As shown, the lower end of the outer hollow fixed shaft 5 is coaxially provided with an outer flange 8, the outer diameter of the outer flange 8 is larger than the outer diameter of the outer hollow fixed shaft 5, and the upper end of the outer hollow fixed shaft 5 is fixedly provided with an outer connecting disc 34. The outer hollow fixed shaft 5 is coaxial with the above-mentioned sleeve 22, and the outer hollow fixed shaft 5 coaxially passes through the above-mentioned sleeve 22, and is connected to the flange at the top of the sleeve 22 through the outer connecting disc 34. The bottom end of the inner hollow fixed shaft 7 is fixed to the ground through an embedded part. Fig.10 As shown, a center flange 9 is coaxially provided at the lower end of the intermediate movable shaft 6 , the outer diameter of the center flange 9 is larger than the outer diameter of the intermediate movable shaft 6 , and a center connecting disc 35 is fixedly provided at the upper end of the intermediate movable shaft 6 .

[0051] like Figure 5 and Figure 6 As shown, the top and bottom ends of the transmission screw 12 are respectively rotatably assembled with the outer hollow fixed shaft 5 and the inner hollow fixed shaft 7 through ball bearings, the top end of the transmission screw 12 extends out of the sleeve 22, and a transmission mechanism is connected between the output shaft of the motor 16 and the top end of the transmission screw 12. Figure 7 As shown, in this embodiment, the transmission mechanism is a sprocket chain transmission mechanism, including a driving sprocket 17, a driven sprocket 18 and a transmission chain 19 meshed between the driving sprocket 17 and the driven sprocket 18, the transmission screw 12 is coaxially connected with the driven sprocket 18, the driven sprocket 18 is located above the sleeve 22, and the driving sprocket 17 is fixed to the output shaft of the motor 16. Of course, the transmission mechanism can also adopt a belt transmission mechanism.

[0052] like Figure 5As shown, a slider 15 is coaxially fixed on the central connecting disc 35 of the intermediate movable shaft 6. The slider 15 is located in the outer hollow fixed shaft 5 and is threadedly matched with the transmission screw 12. The slider 15 is slidingly sealed with the outer hollow fixed shaft 5 during the up and down movement. The lower end of the outer flange 8 is coaxially connected with a first sealing connection disc 10. The intermediate movable shaft 6 passes through the first sealing connection disc 10 and is slidingly sealed with the first sealing connection disc 10. The lower end of the central flange 9 is coaxially connected with a second sealing connection disc 11. The inner hollow fixed shaft 7 passes through the second sealing connection disc 11 and the second sealing connection disc 11 is slidingly sealed with the inner hollow fixed shaft 7. That is, the intermediate movable shaft 6 is in a slidingly sealed relationship with the outer hollow fixed shaft 5 and the inner hollow fixed shaft 7. An upper limit switch 13 for limiting the rising stroke of the lifting seat 2 is installed on the first sealing connection disc 10, and a lower limit switch 14 for limiting the descending stroke of the lifting seat 2 is installed on the inner hollow fixed shaft 7. The upper limit switch 13 and the lower limit switch 14 are arranged opposite to each other up and down.

[0053] In this embodiment, Fig.11 As shown, the lifting seat 2 includes a detachably connected supporting seat body 27 and a connecting shell 28, the connecting shell 28 is sleeved outside the intermediate movable shaft 6 and pressed on the top of the central flange 9, and an upper pressure ring plate 40 is coaxially provided outside the intermediate movable shaft 6, and the upper pressure ring plate 40 is connected to the connecting shell 28. The outer diameter of the upper pressure ring plate 40 is larger than the outer diameter of the first sealing connection plate 10. The upper pressure ring plate 40 is provided to ensure that the lifting seat 2 can touch the upper limit switch 13 when it rises. When the intermediate movable shaft 6 rises, the lifting seat 2 is dragged up synchronously by the central flange 9. When the intermediate movable shaft 6 descends, the lifting seat 2 is pressed on the central flange 9 under its own gravity and descends synchronously with the intermediate movable shaft 6.

[0054] like Figure 1 As shown, the suspension control box 3 is fixed to the outer hollow fixed shaft 5 by means of a clamping member, which also prevents the outer hollow fixed shaft 5 from being deformed, and also ensures the concentricity of the outer hollow fixed shaft 5 and the intermediate movable shaft 6. The suspension control box 3 is provided with a controller connected to the motor, the upper limit switch 13 and the lower limit switch 14. In addition, a clamping member 29 is also provided coaxially on the outer hollow fixed shaft 5. Fig.12 As shown, the hoop 29 includes two semi-annular hoop bodies 30 that are detachably connected together. The semi-annular hoop bodies 30 are buckled outside the outer hollow fixed shaft 5, and the two semi-annular hoop bodies 30 are connected together by two screws in the radial direction of the outer hollow fixed shaft 5. The entire hoop 29 is also detachably connected to the bottom flange 23 by a bolt and nut assembly. In this embodiment, the flange, sealing connection plate, connection disc, flange and other components described are all connected accordingly by bolt and nut assemblies.

[0055] A crank arm 41 is fixed on the outer flange 8, and the crank arm 41 is Y-shaped. A plug rod 42 parallel to the transmission screw 12 is connected to the crank arm 41, and a socket 43 is provided on the support seat body 27. When the lifting seat 2 touches the upper limit switch 13 during the rising process, the plug rod 42 and the socket 43 are plugged into each other.

[0056] The support seat body 27 includes two fork arms 31 arranged in parallel and spaced apart in the front-to-back direction for plugging with the material 38. Each fork arm 31 is provided with a left limit stop 32 and a right limit stop 33 for limiting the left and right positions of the material 38. The distance between the left limit stop 32 and the right limit stop 33 is adjustable.

[0057] In this embodiment, a support ear plate 44 is provided on the fork arm 31, and an adjustment rod 37 is passed through the support ear plate 44. The left limit stopper 32 is a baffle connected to the end of the adjustment rod 37. The adjustment rod 37 is threadedly connected to the left and right sides of the support ear plate 44 with adjustment nuts 36. The extension length of the baffle can be changed by loosening the adjustment nuts 36. The right limit stopper 33 is a stopper. The fork arm 31 is provided with a long hole extending in the left and right directions. There are two long holes and they are arranged at intervals in front and back. The right limit stopper 33 is provided with adjustment holes corresponding to the two long holes. The right limit stopper 33 and the fork arm 31 are detachably assembled through the adjustment holes and the long holes. The left and right positions of the right limit stopper 33 can be changed through the long holes.

[0058] Before using the elevator of the present application, the lifting seat 2 is adjusted to the lower limit travel position, and the material 38 to be transported is transported to the lifting seat 2 by a trolley 39, and the two fork arms 31 are plugged and matched with the material 38, and then the left limit stop 32 and the right limit stop 33 are used to limit the material 38; then the personnel can control the lifting seat 2 to rise through the operation button in the operation box 4, and when the lifting seat 2 touches the upper limit switch 13, the motor stops running, and the material 38 is lifted to the set height, and the material 38 can be withdrawn from the fork arm 31. After that, the personnel control the lifting seat 2 to descend through the operation button in the operation box 4 until the lifting seat 2 touches the lower limit switch 14, and the motor stops, and the lifting seat 2 can place the material 38 again. The entire lifting seat 2 is lifted and lowered between the two vertical beams of the frame 1, and the two vertical beams have a certain limiting effect. The operation box 4 and the lifting seat 2 are respectively located on the left and right sides of the frame 1, which is safer for the operator to operate.

[0059] The hoist of the present invention has high hoisting positioning accuracy, uniform lifting speed during the hoisting process, high stability, simple overall structure, compact structure and small footprint.

[0060] Embodiment 2 of the hoist provided by the present invention:

[0061] The main difference between it and embodiment 1 is that in embodiment 1, the upper limit switch and the lower limit switch are used to control the travel of the hoist. In this embodiment, an upper limit stop plate is fixed outside the outer hollow fixed shaft, and a lower limit stop plate is fixed outside the inner hollow fixed shaft. When the hoist rises to the limit position, it contacts the upper limit stop plate, and when it descends to the limit position, it contacts the lower limit stop plate. At this time, pressure sensors can be set on the upper limit stop plate and the lower limit stop plate, and the motor can be turned off by triggering the pressure sensors.

[0062] Embodiment 3 of the elevator provided by the present invention:

[0063] The main difference between this embodiment and the first embodiment is that: in the first embodiment, the lifting seat sleeve is arranged outside the intermediate movable shaft and is pressed on the central flange. When the intermediate movable shaft rises, the lifting seat is supported upward by the central flange to drive the lifting seat to move. When it falls, it moves synchronously with the central flange by its own gravity. In this embodiment, the lifting seat is directly welded to the intermediate movable shaft. Since the lifting seat adopts a split structure, the installation difficulty of the lifting seat and the intermediate movable shaft will not be increased.

[0064] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "upper", "lower", "front", "back", "left", "right", "radial", "top", "bottom", "inside", "outside", etc., which indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the drawings of this specification, and are only for the purpose of facilitating the explanation of the scheme of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operate in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms cannot be understood or interpreted as limitations on the scheme of the present invention.

[0065] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A hoist, comprising a frame and a lifting seat, the lifting seat is used to place materials, the frame is provided with a driving assembly, the driving assembly is used to drive the lifting seat to move up and down relative to the frame, characterized in that: A screw lifting mechanism is provided between the driving assembly and the lifting seat, and the screw lifting mechanism comprises an outer hollow fixed shaft, an inner hollow fixed shaft, an intermediate movable shaft and a transmission screw which are coaxially arranged; The outer hollow fixed shaft is fixedly mounted on the frame; The inner hollow fixed shaft is used to be fixed on the ground; The transmission screw is rotatably assembled between the outer hollow fixed shaft and the inner hollow fixed shaft, and is transmission-connected with the driving assembly; The intermediate movable shaft is located inside the outer hollow fixed shaft and is sleeved outside the inner hollow fixed shaft. The intermediate movable shaft is slidingly sealed and anti-rotationally matched with the outer hollow fixed shaft and the inner hollow fixed shaft. The anti-rotation assembly is achieved between the intermediate movable shaft and the outer hollow fixed shaft through a keyway and a key. A slider is fixed on the intermediate movable shaft, which is located inside the outer hollow fixed shaft and cooperates with the transmission screw thread. The slider is slidingly sealed and cooperates with the outer hollow fixed shaft. The lifting seat is fixed on the intermediate movable shaft to be raised and lowered between the outer hollow fixed shaft and the inner hollow fixed shaft along with the intermediate movable shaft.

2. The lifting machine according to claim 1, characterized in that: An outer flange is coaxially provided at the lower end of the outer hollow fixed shaft, a center flange is coaxially provided at the lower end of the intermediate movable shaft, a first sealing connection disk is coaxially connected to the lower end of the outer flange, the intermediate movable shaft passes through the first sealing connection disk and is slidingly sealed with the first sealing connection disk; a second sealing connection disk is coaxially connected to the lower end of the center flange, the inner hollow fixed shaft passes through the second sealing connection disk and the second sealing connection disk is slidingly sealed with the inner hollow fixed shaft.

3. The lifting machine according to claim 2, characterized in that: An upper limit component for limiting the rising stroke of the lifting seat is installed on the first sealing connection plate, and a lower limit component for limiting the descending stroke of the lifting seat is installed on the inner hollow fixed shaft.

4. The lifting machine according to claim 3, characterized in that: The upper limit component and the lower limit component are both limit switches.

5. The hoist according to claim 3 or 4, characterized in that: A crank arm is fixed on the outer flange, and a plug rod parallel to the transmission screw is connected to the crank arm. A plug sleeve is provided on the lifting seat. When the lifting seat triggers the upper limit component during the rising process, the plug rod is plugged and matched with the plug sleeve.

6. The hoist according to claim 3 or 4, characterized in that: The lifting seat sleeve is arranged outside the intermediate movable shaft and pressed on top of the center flange. An upper pressure ring plate is coaxially arranged outside the intermediate movable shaft. The upper pressure ring plate is connected to the lifting seat. The outer diameter of the upper pressure ring plate is larger than the outer diameter of the first sealing connection plate so that the upper pressure ring plate can contact the upper limit component.

7. The lifting machine according to claim 6, characterized in that: The lifting seat includes a detachably connected support seat body and a connecting shell, and the connecting shell is sleeved outside the intermediate movable shaft; the support seat body includes two fork arms arranged in parallel and spaced apart in the front-to-back direction for plugging and cooperating with the material, and each fork arm is provided with a left limit stop and a right limit stop for limiting the left and right positions of the material, and the distance between the left limit stop and the right limit stop is adjustable.

8. The elevator according to any one of claims 1 to 4, characterized in that: The drive assembly includes a motor and a transmission mechanism arranged between the motor and the transmission screw. A drive assembly mounting frame is fixed on the frame. The drive assembly mounting frame includes a connecting plate, a sleeve fixed vertically to the connecting plate, a bottom flange coaxially connected to the bottom end of the sleeve, and a motor mounting plate vertically connected to the connecting plate. A mounting opening for the power supply machine to pass through is provided on the connecting plate between the motor mounting plate and the sleeve. The motor is fixed on the motor mounting plate. The sleeve is coaxially arranged with the transmission screw. A plurality of evenly distributed reinforcing plates are connected in the circumferential direction of the sleeve. The reinforcing plates are connected to the connecting plate and the bottom flange.

9. The lifting machine according to claim 8, characterized in that: The transmission mechanism is a sprocket chain transmission mechanism, including a driving sprocket, a driven sprocket and a transmission chain meshed between the driving sprocket and the driven sprocket. The transmission screw is coaxially connected to the driven sprocket. The driven sprocket is located above the sleeve, and the transmission screw passes through the sleeve.

10. The lifting machine according to claim 8, characterized in that: A clamp is coaxially arranged on the outer hollow fixed shaft, and the clamp comprises two semi-annular clamp bodies detachably connected together, and the semi-annular clamp bodies are detachably connected to the bottom flange.

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