Electric hoist limiter

Abstract

The invention relates to an electric hoist limiter, which belongs to travel limiting equipment for electric hoists, and comprises a transmission part, a synchronous rotating part, an independent rotating part, a plurality of control wheels and a plurality of travel switches, the number of the control wheels is the same as that of the travel switches, the plurality of control wheels are overlapped together up and down, and the plurality of travel switches are overlapped together up and down. One control wheel corresponds to one travel switch, the number of the independent rotating components is the same as that of the control wheels, one independent rotating component drives one control wheel to rotate, the transmission component is connected with the synchronous rotating component, and the transmission component drives the synchronous rotating component to rotate. And the synchronous rotating component drives the plurality of control wheels to rotate synchronously. The limiting device is simple in structure, the limiting height can be adjusted according to the use height of a user, operation is easy and convenient, and applicability is high.

Description

Technical Field

[0001] The present invention relates to an electric hoist limiter for an electric hoist, and more particularly to a stroke electric hoist limiter used in an electric hoist. Background Art

[0002] An electric hoist is a special lifting device installed on an overhead crane and a gantry crane. It is divided into a wire rope electric hoist and a chain electric hoist.

[0003] Whether it is a wire rope electric hoist or a chain electric hoist, in order to ensure the safety of the electric hoist during lifting, an electric hoist limiter is used. The electric hoist limiter mainly includes a fire-breaking electric hoist limiter and a stroke electric hoist limiter. The stroke electric hoist limiter is used to limit the up and down lifting stroke of the electric hoist to prevent the electric hoist from over-lifting and causing safety accidents.

[0004] The existing stroke electric hoist limiters have relatively complex structures, are not convenient for adjusting the limit height, and have poor applicability. Summary of the Invention

[0005] In view of the defects in the prior art, the present invention provides an electric hoist limiter with a simple structure, adjustable limit height, which can be adjusted according to the user's usage height, is easy to operate, and has strong applicability.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is:

[0007] An electric hoist limiter, characterized in that it comprises a transmission component, a synchronous rotation component, an independent rotation component, a plurality of control wheels and a plurality of travel switches. The number of control wheels is the same as the number of travel switches. The plurality of control wheels are stacked vertically, and the plurality of travel switches are stacked vertically. One control wheel corresponds to one travel switch.

[0008] There are a plurality of the independent rotation components, and the number of the independent rotation components is the same as the number of the control wheels. One independent rotation component independently drives one control wheel to rotate.

[0009] The transmission component is connected to the synchronous rotation component, and the transmission component drives the synchronous rotation component to rotate, and the synchronous rotation component drives the plurality of control wheels to rotate synchronously.

[0010] The control wheel includes a cylindrical wheel and a cam. The cam is sleeved on the cylindrical wheel. The cylindrical wheel is provided with a gear groove that penetrates the cylindrical wheel. The top end of the cylindrical wheel protrudes from the cam, and the bottom end is recessed in the cam. The cross-sectional diameter of the cylindrical wheel is smaller than the cross-sectional diameter of the cam. The cylindrical wheel and the cam can be integrally formed or separately formed and then welded together by welding.

[0011] The cam includes a cylindrical portion and a boss portion, and the boss portion is provided on the circumferential surface of the cylindrical portion. The cylindrical portion and the boss portion can be integrally formed or separately formed and then welded together by welding.

[0012] The separate rotating member includes a drive shaft and a drive gear mounted on the drive shaft. The drive gear meshes with the gear groove. One control wheel is provided with one drive shaft, and one drive shaft drives one control wheel to rotate independently. A slotted or Phillips head notch is provided at the upper end of the drive shaft for rotating the drive shaft with a slotted or Phillips head screwdriver.

[0013] The synchronous rotating member includes a third rotating shaft, an upper pressure plate, a lower pressure plate and fastening screws. A shoulder is provided on the third rotating shaft, and the lower pressure plate abuts against the shoulder. A threaded hole is provided at the top of the third rotating shaft and extends axially. The threaded hole is adapted to the thread of the fastening screw. After a plurality of control wheels are stacked, they are placed between the upper pressure plate and the lower pressure plate. The fastening screw passes through the upper pressure plate and then screws into the threaded hole of the third rotating shaft to limit the plurality of control wheels between the upper pressure plate and the lower pressure plate.

[0014] The upper pressure plate includes a cylindrical body. An inner groove is provided at the bottom of the cylindrical body, a boss is provided at the top, a central through hole is provided on the cylindrical body, and a plurality of peripheral through holes are provided around the central through hole. Both the central through hole and the peripheral through holes penetrate the cylindrical body.

[0015] The lower pressure plate includes a first cylindrical body and a second cylindrical body. The first cylindrical body is located on the second cylindrical body. The cross-sectional diameter of the first cylindrical body is smaller than that of the second cylindrical body. A plurality of edge holes and a central hole are provided on the first cylindrical body. The edge holes penetrate the first cylindrical body, and the central hole penetrates the first cylindrical body and the second cylindrical body. The first cylindrical body and the second cylindrical body can be integrally formed or separately formed and then welded together by welding.

[0016] The number of the peripheral through holes on the upper pressure plate is the same as the number of the edge holes on the lower pressure plate. The number of the peripheral through holes is also the same as the number of the drive shafts.

[0017] The assembly relationship of the upper pressing plate, lower pressing plate, third rotating shaft, driving shaft and control wheel is as follows: the top of the cylindrical wheel of the control wheel located below extends into the cam of the previous control wheel, the cylindrical wheel of the control wheel located at the uppermost extends into the inner groove of the upper pressing plate, the first cylindrical body of the lower pressing plate extends into the cam of the lowermost control wheel, the upper end of the driving shaft passes through the peripheral through hole on the upper pressing plate, protrudes from the upper pressing plate, and the lower end extends into the edge hole on the lower pressing plate. After multiple driving shafts are installed, the driving teeth on one driving shaft correspond to the gear grooves of one control wheel. The third rotating shaft passes through the central hole of the lower pressing plate, and the fastening screw passes through the upper pressing plate and is screwed into the threaded hole of the third rotating shaft to limit the multiple stacked control wheels between the upper pressing plate and the lower pressing plate.

[0018] The transmission component includes a worm, a worm wheel, a first transmission tooth, a first rotating shaft, a second transmission tooth, a second rotating shaft, a third transmission tooth and a fourth transmission tooth. The worm wheel meshes with the worm. The first transmission tooth and the worm wheel are installed on the first rotating shaft, and the first transmission tooth is located above the worm wheel. The second transmission tooth and the third transmission tooth are installed on the second rotating shaft, and the third transmission tooth is located above the second transmission tooth. The second transmission tooth meshes with the first transmission tooth, the third transmission tooth meshes with the fourth transmission tooth, and the fourth transmission tooth is installed on the third rotating shaft.

[0019] The electric hoist limiter further includes a bottom gear box, a middle mounting box and a top cover. The bottom gear box is fixed below the middle mounting box by bolts, and the top cover is fixed above the middle mounting box by bolts.

[0020] The transmission component is located in the bottom gear box. The worm is rotatably installed on the gear box. One end of the worm extends out of the gear box and the other end is located inside the gear box. The first rotating shaft, the second rotating shaft and the third rotating shaft are rotatably installed on the middle mounting box. The third rotating shaft passes through the middle mounting box, with the lower end located inside the gear box and the upper end located inside the top cover.

[0021] The middle mounting box is provided with a travel switch mounting platform. After multiple travel switches are stacked together, bolts are passed through each travel switch and then screwed into the travel switch mounting platform, and the multiple stacked travel switches are fixed on the travel switch mounting platform by bolts.

[0022] The present invention has the following beneficial effects compared with the prior art:

[0023] The present invention includes a transmission component, a synchronous rotation component, an independent rotation component, a plurality of control wheels and a plurality of travel switches. The number of control wheels is the same as the number of travel switches. The plurality of control wheels are stacked on top of each other, and the plurality of travel switches are stacked on top of each other. One control wheel corresponds to one travel switch. There are a plurality of independent rotation components, and the number of independent rotation components is the same as the number of control wheels. One independent rotation component drives one control wheel to rotate alone. The transmission component is connected to the synchronous rotation component, and the transmission component drives the synchronous rotation component to rotate. The synchronous rotation component drives the plurality of control wheels to rotate synchronously. Through the synchronous rotation component, the present invention can drive the plurality of control wheels to rotate synchronously. Through the independent rotation component, the rotation of a single control wheel is controlled. According to the specific height of the limit required by the user, the rotation angle of each control wheel is adjusted. Then, the electric hoist limiter is installed in the electric hoist. The worm of the transmission component is connected to the gearbox of the electric hoist. The rotation of the motor of the electric hoist can drive the worm to rotate. Each gear provided by the transmission component, through the gear ratio, can transmit the rotation of the electric hoist to the third rotating shaft. The third rotating shaft will drive the plurality of cams to rotate synchronously. Since the angles of each control wheel have been adjusted before, during synchronous rotation, the time when each control wheel contacts the corresponding travel switch will be different. Whichever control wheel contacts the travel switch will touch the travel switch and give a signal to the travel switch. The touched travel switch will send the signal to the controller of the electric hoist. The controller will issue a control command according to the corresponding travel switch to control the motor of the electric hoist. For example, if the fast-lift travel switch is touched, then the controller will control the fast-lift to stop and will control the motor to stop rising quickly. At this time, the electric hoist can only rise slowly. When the slow-lift travel switch is touched, the controller will control the slow-lift of the motor to stop, and the electric hoist will no longer rise. The same principle can also control the fast-lower stop and slow-lower stop of the electric hoist, and the electric hoist will no longer lower. In this way, the stroke limit of the electric hoist can be realized. Through the action of the plurality of control wheels and travel switches, the stroke limit of the electric hoist can be realized, with a simple structure and easy to control. Moreover, by adjusting a plurality of gears, the transmission ratio can be adjusted, so that the limit stroke of the electric hoist can be adjusted. It can be selected and adjusted according to the specific limit height of the user. After the adjustment is completed and installed in the electric hoist, the stroke limit can be realized, with simple and convenient operation and strong applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0025] Figure 1Schematic diagram of the overall external structure of the present invention;

[0026] Figure 2 Schematic diagram of the sectional structure of the present invention;

[0027] Figure 3 Schematic diagram of the structure of the present invention after removing the bottom gearbox, the middle mounting box and the top cover;

[0028] Figure 4 Schematic diagram of the bottom gearbox structure of the present invention;

[0029] Figure 5 Schematic diagram of the middle mounting box structure of the present invention;

[0030] Figure 6 Schematic diagram of the control wheel structure of the present invention;

[0031] Figure 7 Schematic diagram of the structure of the control wheel of the present invention in another view direction;

[0032] Figure 8 Schematic diagram of the structure of the cooperation between the control wheel and the separately rotating component of the present invention;

[0033] Figure 9 Schematic diagram of the upper pressure plate structure of the present invention;

[0034] Figure 10 Schematic diagram of the lower pressure plate structure of the present invention.

[0035] Reference numerals:

[0036] 1, bottom gearbox; 10, rectangular box body; 11, mounting hole; 12, support ear; 2, middle mounting box; 20, mounting table; 21, screw hole; 3, top cover; 4, control wheel; 40, cylindrical wheel; 41, cam; 411, cylindrical part; 412, boss part; 42, gear groove; 5, travel switch; 6, drive shaft; 60, drive tooth; 7, third rotating shaft; 70, upper pressure plate; 701, cylindrical body; 702, inner groove; 703, boss; 704, central through hole; 705, peripheral through hole; 71, lower pressure plate; 711, first cylindrical body; 712, second cylindrical body; 713, edge hole; 714, central hole; 72, fastening screw; 73, shoulder; 8, worm; 80, worm gear; 81, first transmission tooth; 82, first rotating shaft; 83, second transmission tooth; 84, second rotating shaft; 85, third transmission tooth; 86, fourth transmission tooth. Detailed implementation manners

[0037] The present invention provides an electric hoist limiter. The structure of this electric hoist limiter is completely different from that of the existing electric hoist limiters. Its function is to limit the travel of the electric hoist. By installing this electric hoist limiter inside the electric hoist, the limit of the lifting height of the electric hoist can be achieved. The present invention can adjust the limit according to the specific lifting height of the electric hoist used by the user, and can customize the limit of the lifting height of the electric hoist. It has strong applicability and a wide range of applications. Moreover, the whole structure is simple and easy to adjust.

[0038] The following will describe the structure and principle of the present invention in detail with reference to specific embodiments and drawings:

[0039] This embodiment provides an electric hoist limiter, which includes auxiliary components and core components:

[0040] The auxiliary components include a bottom gearbox 1, a middle mounting box 2, and a top cover 3. The bottom gearbox 1, the middle mounting box 2, and the top cover 3 are connected by bolts. A closed space is formed between the bottom gearbox 1 and the middle mounting box 2, and a closed space is formed between the middle mounting box 2 and the top cover 3.

[0041] The bottom gearbox 1 includes a rectangular box body 10. An installation hole 11 is provided on the side of the rectangular box body 10. The installation hole 11 penetrates through the rectangular box body 10 and communicates with the internal space of the rectangular box body 10. A support ear 12 and a plurality of support holes are provided inside the rectangular box body 10. The support ear 12 is provided with a through hole, and the height of the through hole of the support ear 12 is flush with the height of the installation hole 11. The middle mounting box 2 is a rectangular frame, and an installation table 20 is provided inside. A screw hole 21 is provided on the installation table, and the top cover 3 is a rectangular cover.

[0042] The core components include a transmission component, a synchronous rotation component, an independent rotation component, a plurality of control wheels 4, and a plurality of travel switches 5. The number of control wheels 4 is the same as the number of travel switches 5. A plurality of control wheels 4 are stacked on top of each other vertically, and a plurality of travel switches 5 are stacked on top of each other vertically. One control wheel 4 corresponds to one travel switch 5. The number of control wheels 4 and travel switches 5 is related to the set travel control.

[0043] In this embodiment, we set that the electric hoist has four strokes, namely fast lifting, slow lifting, fast lowering, and slow lowering. Of course, there can also be more than four strokes or less than four strokes. For example, there are only fast lifting and fast lowering. If the electric hoist is set to have four strokes, then there are four corresponding travel switches, which are, from top to bottom, the fast lifting travel switch, the slow lifting travel switch, the fast lowering travel switch, and the slow lowering travel switch. Of course, it can also be in other orders. The four travel switches are fixed by two screws. The two screws pass through the four travel switches and are then screwed into the screw holes 21 on the installation table of the middle mounting box 2 for fixed installation.

[0044] Since there are four travel switches set in this embodiment, the number of corresponding control wheels is also four.

[0045] The control wheel 4 includes a cylindrical wheel 40 and a cam 41. The cam 41 is sleeved on the cylindrical wheel 40. The cylindrical wheel 40 is provided with a gear groove 42, and the gear groove 42 penetrates through the cylindrical wheel 40. The top end of the cylindrical wheel 40 protrudes from the cam 40 to form a convex table surface, and the bottom end is concave in the cam 40 to form a concave surface. The cross-sectional diameter of the cylindrical wheel 40 is smaller than the cross-sectional diameter of the cam 41. The cylindrical wheel and the cam can be integrally formed or separately formed and then welded together by welding.

[0046] This structural design of the control wheel 4 facilitates the stacking of control wheels on top of each other. When the control wheels are stacked, the convex table surface of the control wheel located below is inserted into the concave surface of the control wheel located above, and their sizes are adapted. In this way, it is very convenient to stack multiple control wheels together to form a main body of the control wheel. When the control wheel rotates alone, it also limits the independent rotation of the control wheel to ensure concentric rotation of the control wheel.

[0047] The cam 41 includes a cylindrical part 411 and a convex table part 412, and the convex table part 412 is arranged on the circumferential surface of the cylindrical part 411. The cylindrical part and the convex table part can be integrally formed or separately formed and then welded together by welding.

[0048] When the cylindrical part 411 rotates, it drives the convex table part 412 to rotate. When the convex table part 402 touches the corresponding travel switch, a trigger signal of the travel switch can be generated.

[0049] In order to achieve the independent rotation of the control wheel 4, each control wheel 4 is separately adapted with a separate rotation component, and a separate rotation component drives a control wheel to rotate alone.

[0050] The separate rotation component includes a driving shaft 6 and a driving tooth 60 installed on the driving shaft 6. The driving tooth 60 meshes with the gear groove 42 of the control wheel, and one driving shaft 6 drives a control wheel to rotate alone. The upper end of the driving shaft 6 is provided with a cross-shaped or plum blossom-shaped notch for rotating the driving shaft with a cross-shaped or plum blossom-shaped screwdriver.

[0051] In order to achieve the synchronous rotation of the control wheels, it is necessary to adapt a synchronous rotation component to drive the four control wheels to rotate synchronously and concentrically.

[0052] The synchronously rotating component includes a third rotating shaft 7, an upper pressure plate 70, a lower pressure plate 71 and fastening screws 72. A shoulder 73 is provided on the third rotating shaft 7, and the lower pressure plate 71 abuts against the shoulder 73. The downward displacement of the lower pressure plate 71 is restricted by the action of the shoulder 73. A threaded hole is provided at the top of the third rotating shaft 7, and the threaded hole extends axially. The thread of the threaded hole is adapted to the thread of the fastening screw 72. After a plurality of control wheels 4 are stacked, they are placed between the upper pressure plate 70 and the lower pressure plate 71. The fastening screw 72 passes through the upper pressure plate 70 and is screwed into the threaded hole of the third rotating shaft 7. By the action of the fastening screw, the upward displacement of the upper pressure plate is restricted, so that a plurality of control wheels 4 can be limited between the upper pressure plate 70 and the lower pressure plate 71.

[0053] Specifically, the structure of the upper pressure plate 70 is as follows:

[0054] The upper pressure plate 70 includes a cylindrical body 701. An inner groove 702 is provided at the bottom of the cylindrical body 701, and a boss 703 is provided at the top. A central through hole 704 is provided on the cylindrical body 701, and a plurality of peripheral through holes 705 are provided around the central through hole 704. Both the central through hole 704 and the peripheral through holes 705 penetrate the cylindrical body 701. The provided central through hole 704 is convenient for the fastening screw 72 to pass through, so as to limit the upward movement of the upper pressure plate 70 through the fastening screw. The function of the peripheral through holes 705 is to facilitate the driving shaft to pass through. In this example, there are four peripheral through holes 705, and four driving shafts respectively pass through these four peripheral through holes.

[0055] The structure of the lower pressure plate is as follows:

[0056] The lower pressure plate 71 includes a first cylindrical body 711 and a second cylindrical body 712. The first cylindrical body 711 is located on the second cylindrical body 712. The cross-sectional diameter of the first cylindrical body 711 is smaller than the cross-sectional diameter of the second cylindrical body 712. A plurality of edge holes 713 and a central hole 714 are provided on the first cylindrical body 711. The edge holes 713 penetrate the first cylindrical body 711, and the central hole 714 penetrates the first cylindrical body 711 and the second cylindrical body 712. The first cylindrical body and the second cylindrical body can be integrally formed or separately formed and then welded together by welding. The provided edge holes 713 are for facilitating the insertion of the driving shaft. Therefore, there are four edge holes, and four driving shafts are respectively inserted to position the driving shafts. The provided central hole is for facilitating the third rotating shaft 7 to pass through. Therefore, there is only one central hole.

[0057] The assembly relationship of the upper pressing plate 70, the lower pressing plate 71, the third rotating shaft 7, the driving shaft 6 and the control wheel 4 is as follows: the top of the cylindrical wheel of the control wheel located below extends into the cam of the previous control wheel; the cylindrical wheel of the control wheel located at the uppermost position extends into the inner groove of the upper pressing plate; the first cylindrical body of the lower pressing plate extends into the cam of the lowermost control wheel; the upper end of the driving shaft passes through the peripheral through hole on the upper pressing plate, protrudes from the upper pressing plate, and the lower end extends into the edge hole on the lower pressing plate. After multiple driving shafts are installed, the driving teeth on one driving shaft correspond to the gear grooves of one control wheel. The third rotating shaft passes through the central hole of the lower pressing plate, and the fastening screw passes through the upper pressing plate and is screwed into the threaded hole of the third rotating shaft to limit the multiple stacked control wheels between the upper pressing plate and the lower pressing plate.

[0058] The transmission components include a worm 8, a worm wheel 80, a first transmission gear 81, a first rotating shaft 82, a second transmission gear 83, a second rotating shaft 84, a third transmission gear 85, and a fourth transmission gear 86. The worm wheel 80 meshes with the worm 8. The first transmission gear 81 and the worm wheel 80 are installed on the first rotating shaft 82, and the first transmission gear 81 is located above the worm wheel 80. The second transmission gear 82 and the third transmission gear 85 are installed on the second rotating shaft 84, and the third transmission gear 85 is located above the second transmission gear 83. The second transmission gear 83 meshes with the first transmission gear 81. The third transmission gear 85 meshes with the fourth transmission gear 86, and the fourth transmission gear 86 is installed on the third rotating shaft 7.

[0059] The worm 8 is rotatably installed on the mounting hole 11 of the bottom gearbox through a bearing or a bushing. One end of the worm 8 extends out of the mounting hole 11, and one end passes through the through hole of the support ear 12. In this way, the worm 8 is installed on the bottom gearbox, supported by the support ear 12 at one end and by the mounting hole 11 at the other end. The tops of the first rotating shaft 82, the second rotating shaft 84 and the third rotating shaft 7 are installed on the middle mounting box 2, and the bottoms are installed in the support holes of the bottom gearbox 1. After installation, the first rotating shaft 82, the second rotating shaft 84 and the third rotating shaft 7 can rotate circumferentially. The third rotating shaft 7 passes through the middle mounting box 2, with the lower end located inside the bottom gearbox 1 and the upper end located inside the top cover 3.

[0060] After installation, the lower ends of the worm 8, the worm wheel 80, the first transmission gear 81, the first rotating shaft 82, the second transmission gear 83, the second rotating shaft 84, the third transmission gear 85, the fourth transmission gear 86 and the third rotating shaft are located in the enclosed space formed by the bottom gearbox 1 and the middle mounting box 2, and the travel switch, the control wheel, the upper end of the third rotating shaft, the upper pressing plate, the lower pressing plate and the driving shaft are located in the enclosed space formed by the middle mounting box 2 and the top cover 3.

[0061] After installation, the cams 40 of the four control wheels 4 are aligned, and the fastening screws are tightened. At this time, the control wheels can only rotate synchronously by being driven by the worm. At this point, an electric hoist limiter is assembled. Of course, in order to improve the application range of the electric hoist limiter and achieve better applicability, we can set electric hoist limiters with different transmission ratios. Their structures are exactly the same, and the only difference is the different transmission ratios of the gears. According to the limit height of different users, an electric hoist limiter with a suitable transmission ratio can be selected. After selecting the appropriate electric hoist limiter with a transmission ratio, then loosen the fastening screws, and then use a screwdriver to drive the drive shaft. Through the drive shaft, the four control wheels are driven and controlled, and each control wheel is rotated individually so that the cams of the control wheels are no longer aligned. Then tighten the fastening screws and install the electric hoist limiter in the electric hoist. The worm is connected to the gearbox of the electric hoist. The rotation of the motor of the electric hoist is transmitted to the worm through the gearbox. The worm 8 drives the worm gear 80, the worm gear 80 drives the first rotating shaft 82 to rotate, thereby driving the first transmission gear to rotate, and then driving the second transmission gear 83 to rotate. The second transmission gear 83 drives the second rotating shaft 84 to rotate. The rotation of the second rotating shaft 84 drives the third transmission gear 85 to rotate. The third transmission gear 85 drives the fourth transmission gear 86 to rotate, and finally drives the third rotating shaft 7 to rotate. Since the upper pressure plate and the lower pressure plate press all the control wheels tightly, the rotation of the third rotating shaft 7 will drive all the control wheels to rotate synchronously and concentrically. In this way, the control wheels of the limiter will rotate following the rotation of the motor of the electric hoist. Since the initial angles of each control wheel have been adjusted before, after synchronous rotation, the time when each control wheel touches the corresponding travel switch will be different. Once a control wheel touches the corresponding travel switch, a corresponding signal will be sent out, and the controller will receive the signal of the corresponding travel switch and close the corresponding stroke. In this embodiment, a total of four strokes are set, namely fast lifting, slow lifting, fast lowering, and slow lowering. The four strokes correspond to four travel switches. When the fast lifting travel switch is touched, a closing signal will be sent to the controller of the electric hoist. After the controller receives the closing signal, it will control the electric hoist to stop fast lifting. At this time, the electric hoist can only rise slowly. When the slow lifting travel switch is touched, by the same principle, the controller will close the slow lifting action of the electric hoist, and at this time the electric hoist will stop rising. By the same principle and process, the controller can also achieve the closing control of fast lowering and slow lowering, controlling the electric hoist to stop lowering. In this way, the stroke limit control of the entire electric hoist is realized, avoiding the electric hoist from running beyond the stroke and causing safety accidents. Since this embodiment sets four strokes of fast lifting, slow lifting, fast lowering, and slow lowering, it can gradually control the speed reduction of the electric hoist and cause less damage to the motor. The electric hoist limiter provided in this embodiment can achieve the limit of the electric hoist through several transmission gears and control wheels. The structure is simple and easy to control, can reduce the volume of the electric hoist limiter, and is convenient for the installation and use of the electric hoist limiter.The electric hoist limiter provided in this embodiment can select electric hoist limiters with different transmission ratios according to the limit height required by the user, and then by individually adjusting the angle of the control wheel, the control of multiple strokes can be achieved, ultimately achieving the purpose of limiting. It can adjust the limit according to the lifting height of the electric hoist specifically used by the user, and can customize the limit of the lifting height of the electric hoist, with stronger applicability.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered by the scope of the claims and the description of the present invention.

Claims

1. An electric hoist limiter, characterized in that: It includes a transmission part, a synchronous rotating part, a separate rotating part, a plurality of control wheels and a plurality of travel switches. The number of the control wheels is the same as the number of the travel switches. The plurality of control wheels are stacked up and down, and the plurality of travel switches are stacked up and down. One control wheel corresponds to one travel switch. There are multiple independent rotating parts, the number of which is the same as the number of control wheels, and one independent rotating part drives one control wheel to rotate. The transmission component is connected with the synchronous rotation component, the transmission component drives the synchronous rotation component to rotate, and the synchronous rotation component drives the multiple control wheels to rotate synchronously.

2. The electric hoist limiter according to claim 1, characterized in that: The control wheel includes a cylindrical wheel and a cam. The cam is sleeved on the cylindrical wheel. The cylindrical wheel is provided with a gear groove. The top end of the cylindrical wheel protrudes from the cam and the bottom end is recessed in the cam. The cross-sectional diameter of the cylindrical wheel is smaller than the cross-sectional diameter of the cam. The cylindrical wheel and the cam are integrally formed.

3. The electric hoist limiter according to claim 2, characterized in that: The cam comprises a cylindrical portion and a boss portion, wherein the boss portion is arranged on the circumferential surface of the cylindrical portion, and the cylindrical portion and the boss portion are integrally formed.

4. An electric hoist limiter according to claim 2 or 3, characterized in that: The independently rotating component includes a driving shaft and driving teeth mounted on the driving shaft, the driving teeth meshing with the gear grooves, one control wheel is equipped with one driving shaft, and one driving shaft independently drives one control wheel to rotate.

5. The electric hoist limiter according to claim 4, characterized in that: The synchronously rotating component includes a third rotating shaft, an upper pressure plate, a lower pressure plate and a fastening screw. The third rotating shaft is provided with a boss, and the lower pressure plate rests on the boss. A threaded hole is provided on the top of the third rotating shaft, and the threaded hole extends axially. The threaded hole is adapted to the thread of the fastening screw. A plurality of control wheels are overlapped and placed between the upper pressure plate and the lower pressure plate. The fastening screw passes through the upper pressure plate and is screwed into the threaded hole of the third rotating shaft to limit the plurality of control wheels between the upper pressure plate and the lower pressure plate.

6. The electric hoist limiter according to claim 5, characterized in that: The upper pressure plate includes a cylindrical body, an inner groove is arranged at the bottom of the cylindrical body, a boss is arranged at the top, a central through hole is arranged on the cylindrical body, and a plurality of peripheral through holes are arranged around the central through hole. Both the central through hole and the peripheral through holes penetrate the cylindrical body.

7. The electric hoist limiter according to claim 5, characterized in that: The lower pressure plate includes a first cylindrical body and a second cylindrical body, the first cylindrical body is located on the second cylindrical body, the cross-sectional diameter of the first cylindrical body is smaller than the cross-sectional diameter of the second cylindrical body, and the first cylindrical body is provided with a plurality of edge holes and a center hole, the edge holes pass through the first cylindrical body, and the center hole passes through the first cylindrical body and the second cylindrical body.

8. The electric hoist limiter according to claim 5, characterized in that: The assembly relationship of the upper pressing plate, the lower pressing plate, the third rotating shaft, the driving shaft and the control wheel is as follows: the top end of the cylindrical wheel of the control wheel at the bottom extends into the cam of the upper control wheel, the cylindrical wheel of the control wheel at the top extends into the groove in the upper pressing plate, the first cylindrical body of the lower pressing plate extends into the cam of the bottom control wheel, the upper end of the driving shaft passes through the peripheral through hole on the upper pressing plate, protrudes from the upper pressing plate, and the lower end extends into the edge hole on the lower pressing plate. After multiple driving shafts are installed, the driving teeth on one driving shaft correspond to the gear groove of a control wheel, the third rotating shaft passes through the center hole of the lower pressing plate, and the fastening screw passes through the upper pressing plate and is screwed into the threaded hole of the third rotating shaft to limit the multiple overlapping control wheels between the upper pressing plate and the lower pressing plate.

9. The electric hoist limiter according to claim 5, characterized in that: The transmission component includes a worm, a worm wheel, a first transmission tooth, a first rotating shaft, a second transmission tooth, a second rotating shaft, a third transmission tooth, and a fourth transmission tooth. The worm wheel is meshed with the worm, the first transmission tooth and the worm wheel are installed on the first rotating shaft, the first transmission tooth is located above the worm wheel, the second transmission tooth and the third transmission tooth are installed on the second rotating shaft, the third transmission tooth is located above the second transmission tooth, the second transmission tooth is meshed with the first transmission tooth, the third transmission tooth is meshed with the fourth transmission tooth, and the fourth transmission tooth is installed on the third rotating shaft.

10. The electric hoist limiter according to claim 1, characterized in that: It also includes a bottom gear box, a middle installation box and a top cover shell. The bottom gear box is fixed below the middle installation box by bolts, and the top cover shell is fixed above the middle installation box by bolts.

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