Limiting stopper

Abstract

The utility model relates to a limiter, which belongs to travel limiting equipment for an electric hoist and comprises a transmission component, a synchronous rotating component, an independent rotating component, 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 up and down, and the plurality of travel switches are overlapped 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, and the limiting device is easy and convenient to operate and high in applicability.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of limiters for electric hoist, in particular to a kind of stroke limiter used to electric hoist. BACKGROUND

[0002] Electric hoist is a kind of special lifting equipment, installed on headstock gear and gantry crane. It is divided into wire rope electric hoist and ring chain electric hoist.

[0003] Whether it is wire rope electric hoist or ring chain electric hoist, in order to realize the safety of electric hoist lifting, electric hoist will use limiter, limiter mainly includes fire limit stopper and stroke limiter, stroke limiter is used to limit the up and down lifting stroke of electric hoist, avoid electric hoist to lift over position, produce safety accident.

[0004] The structure of existing stroke limiter is relatively complex, and it is not convenient to adjust the limiting height, and the applicability is poor. INVENTION CONTENTS

[0005] In view of the defects in the prior art, the utility model provides a kind of limiter, the limiter structure is simple, and limiting height can be adjusted, according to the use height of user, it is easy and convenient to operate, and the applicability is strong.

[0006] In order to solve the above technical problems, the technical scheme adopted by the utility model is:

[0007] A kind of limiter, characterized in that: including transmission component, synchronous rotating component, single rotating component, multiple control wheels and multiple travel switches, the number of control wheel is same with the number of travel switch, multiple control wheels are stacked together, multiple travel switches are stacked together, one control wheel corresponds to one travel switch,

[0008] The single rotating component has multiple, the number of single rotating component is same with the number of control wheel, one single rotating component drives one control wheel to rotate,

[0009] Transmission component is connected with synchronous rotating component, transmission component drives synchronous rotating component to rotate, and synchronous rotating component drives multiple control wheels to rotate synchronously.

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

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

[0012] The single rotating part comprises a driving shaft and a driving gear mounted on the driving shaft, the driving gear is engaged with the gear groove, one control wheel is provided with a driving shaft, and one control wheel is driven to rotate by one driving shaft. The upper end of the driving shaft is provided with a T-shaped or plum blossom-shaped notch, so that the driving shaft is rotated by a T-shaped or plum blossom-shaped turning tool.

[0013] The synchronous rotating part comprises a third rotating shaft, an upper pressing plate, a lower pressing plate and a fastening screw, the third rotating shaft is provided with a shoulder, the lower pressing plate abuts against the shoulder, the top of the third rotating shaft is provided with a threaded hole extending axially, the threaded hole is matched with the thread of the fastening screw, and a plurality of control wheels are placed between the upper pressing plate and the lower pressing plate after being stacked, the fastening screw is screwed into the threaded hole of the third rotating shaft after passing through the upper pressing plate, and the plurality of control wheels are limited between the upper pressing plate and the lower pressing plate.

[0014] The upper pressing plate comprises a cylindrical body, the bottom of the cylindrical body is provided with an inner groove, the top of the cylindrical body is provided with a boss, the cylindrical body is provided with a central through hole, and a plurality of peripheral through holes are arranged around the central through hole. The central through hole and the peripheral through hole pass through the cylindrical body.

[0015] The lower pressing plate comprises 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 arranged on the first cylindrical body, the edge holes pass through the first cylindrical body, and the central hole passes through 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 peripheral through holes on the upper pressing plate is the same as the number of edge holes on the lower pressing plate. The number of peripheral through holes is also the same as the number of driving shafts.

[0017] The assembly relationship of the upper pressure plate, lower pressure plate, third rotating shaft, drive shaft and control wheel is as follows: the top of the cylindrical wheel of the lower control wheel extends into the cam of the previous control wheel, the cylindrical wheel of the uppermost control wheel extends into the groove of the upper pressure plate, the first cylindrical body of the lower pressure plate extends into the cam of the lowermost control wheel, the upper end of the drive shaft passes through the peripheral through hole of the upper pressure plate and protrudes from the upper pressure plate, and the lower end extends into the edge hole of the lower pressure plate. After multiple drive shafts are installed, the drive teeth on one drive shaft correspond to the gear groove of one control wheel. The third rotating shaft passes through the center hole of the lower pressure plate, and the fastening screw passes through the upper pressure plate and is screwed into the threaded hole of the third rotating shaft, thus limiting the multiple stacked control wheels between the upper pressure plate and the lower pressure 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 mounted on the first rotating shaft, with the first transmission tooth located above the worm wheel. The second and third transmission teeth are mounted on the second rotating shaft, with the third transmission tooth located above the second transmission tooth. The second transmission tooth meshes with the first transmission tooth, and the third and fourth transmission teeth mesh. The fourth transmission tooth is mounted on the third rotating shaft.

[0019] The limiter also includes a bottom gearbox, a middle mounting box, and a top cover. The bottom gearbox is fixed to the bottom of the middle mounting box by bolts, and the top cover is fixed to the top of the middle mounting box by bolts.

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

[0021] The central mounting box is equipped with a limit switch mounting platform. After multiple limit switches are stacked together, they are screwed into the limit switch mounting platform by passing bolts through each limit switch. The multiple stacked limit switches are fixed to the limit switch mounting platform by bolts.

[0022] The present invention has the following advantages over the prior art:

[0023] The utility model discloses a transmission part, synchronous rotation part, single rotation part, multiple control wheels and multiple travel switches, the number of control wheel is same with the number of travel switch, multiple control wheels are superimposed together, multiple travel switches are superimposed together, a control wheel corresponds a travel switch, single rotation part has multiple, the number of single rotation part is same with the number of control wheel, a single rotation part drives a control wheel to rotate, transmission part is connected with synchronous rotation part, transmission part drives synchronous rotation part to rotate, and synchronous rotation part drives multiple control wheels to rotate synchronously. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the specific embodiment of the utility model or the technical scheme in prior art, the following will introduce the drawing used in the specific embodiment or prior art description simply. In all drawings, similar elements or parts are generally identified by similar reference signs. In the drawings, various elements or parts are not necessarily drawn according to actual proportion.

[0025] Figure 1The utility model discloses a whole external structure schematic diagram shows that the utility model discloses a cross section structure schematic diagram shows that the utility model discloses a bottom gear box, middle installation box and top cover after the structure schematic diagram shows that the utility model discloses a bottom gear box structure schematic diagram shows that the utility model discloses a middle installation box structure schematic diagram shows that the utility model discloses a control wheel structure schematic diagram shows that the utility model discloses a control wheel another view direction structure schematic diagram shows that the utility model discloses a control wheel and separate rotation part cooperation structure schematic diagram shows that the utility model discloses an upper pressing plate structure schematic diagram shows that the utility model discloses a lower pressing plate structure schematic diagram.

[0026] Figure 2 The utility model discloses a cross section structure schematic diagram shows that the utility model discloses a bottom gear box, middle installation box and top cover after the structure schematic diagram shows that the utility model discloses a bottom gear box structure schematic diagram shows that the utility model discloses a middle installation box structure schematic diagram shows that the utility model discloses a control wheel structure schematic diagram shows that the utility model discloses a control wheel another view direction structure schematic diagram shows that the utility model discloses a control wheel and separate rotation part cooperation structure schematic diagram shows that the utility model discloses an upper pressing plate structure schematic diagram shows that the utility model discloses a lower pressing plate structure schematic diagram.

[0027] Figure 3 The utility model discloses a cross section structure schematic diagram shows that the utility model discloses a bottom gear box, middle installation box and top cover after the structure schematic diagram shows that the utility model discloses a bottom gear box structure schematic diagram shows that the utility model discloses a middle installation box structure schematic diagram shows that the utility model discloses a control wheel structure schematic diagram shows that the utility model discloses a control wheel another view direction structure schematic diagram shows that the utility model discloses a control wheel and separate rotation part cooperation structure schematic diagram shows that the utility model discloses an upper pressing plate structure schematic diagram shows that the utility model discloses a lower pressing plate structure schematic diagram.

[0028] Figure 4 The utility model discloses a cross section structure schematic diagram shows that the utility model discloses a bottom gear box, middle installation box and top cover after the structure schematic diagram shows that the utility model discloses a bottom gear box structure schematic diagram shows that the utility model discloses a middle installation box structure schematic diagram shows that the utility model discloses a control wheel structure schematic diagram shows that the utility model discloses a control wheel another view direction structure schematic diagram shows that the utility model discloses a control wheel and separate rotation part cooperation structure schematic diagram shows that the utility model discloses an upper pressing plate structure schematic diagram shows that the utility model discloses a lower pressing plate structure schematic diagram.

[0029] Figure 5 The utility model discloses a cross section structure schematic diagram shows that the utility model discloses a bottom gear box, middle installation box and top cover after the structure schematic diagram shows that the utility model discloses a bottom gear box structure schematic diagram shows that the utility model discloses a middle installation box structure schematic diagram shows that the utility model discloses a control wheel structure schematic diagram shows that the utility model discloses a control wheel another view direction structure schematic diagram shows that the utility model discloses a control wheel and separate rotation part cooperation structure schematic diagram shows that the utility model discloses an upper pressing plate structure schematic diagram shows that the utility model discloses a lower pressing plate structure schematic diagram.

[0030] Figure 6 The utility model discloses a cross section structure schematic diagram shows that the utility model discloses a bottom gear box, middle installation box and top cover after the structure schematic diagram shows that the utility model discloses a bottom gear box structure schematic diagram shows that the utility model discloses a middle installation box structure schematic diagram shows that the utility model discloses a control wheel structure schematic diagram shows that the utility model discloses a control wheel another view direction structure schematic diagram shows that the utility model discloses a control wheel and separate rotation part cooperation structure schematic diagram shows that the utility model discloses an upper pressing plate structure schematic diagram shows that the utility model discloses a lower pressing plate structure schematic diagram.

[0031] Figure 7 The utility model discloses a cross section structure schematic diagram shows that the utility model discloses a bottom gear box, middle installation box and top cover after the structure schematic diagram shows that the utility model discloses a bottom gear box structure schematic diagram shows that the utility model discloses a middle installation box structure schematic diagram shows that the utility model discloses a control wheel structure schematic diagram shows that the utility model discloses a control wheel another view direction structure schematic diagram shows that the utility model discloses a control wheel and separate rotation part cooperation structure schematic diagram shows that the utility model discloses an upper pressing plate structure schematic diagram shows that the utility model discloses a lower pressing plate structure schematic diagram.

[0032] Figure 8 The utility model discloses a cross section structure schematic diagram shows that the utility model discloses a bottom gear box, middle installation box and top cover after the structure schematic diagram shows that the utility model discloses a bottom gear box structure schematic diagram shows that the utility model discloses a middle installation box structure schematic diagram shows that the utility model discloses a control wheel structure schematic diagram shows that the utility model discloses a control wheel another view direction structure schematic diagram shows that the utility model discloses a control wheel and separate rotation part cooperation structure schematic diagram shows that the utility model discloses an upper pressing plate structure schematic diagram shows that the utility model discloses a lower pressing plate structure schematic diagram.

[0033] Figure 9 The utility model discloses a cross section structure schematic diagram shows that the utility model discloses a bottom gear box, middle installation box and top cover after the structure schematic diagram shows that the utility model discloses a bottom gear box structure schematic diagram shows that the utility model discloses a middle installation box structure schematic diagram shows that the utility model discloses a control wheel structure schematic diagram shows that the utility model discloses a control wheel another view direction structure schematic diagram shows that the utility model discloses a control wheel and separate rotation part cooperation structure schematic diagram shows that the utility model discloses an upper pressing plate structure schematic diagram shows that the utility model discloses a lower pressing plate structure schematic diagram.

[0034] Figure 10 The utility model discloses a cross section structure schematic diagram shows that the utility model discloses a bottom gear box, middle installation box and top cover after the structure schematic diagram shows that the utility model discloses a bottom gear box structure schematic diagram shows that the utility model discloses a middle installation box structure schematic diagram shows that the utility model discloses a control wheel structure schematic diagram shows that the utility model discloses a control wheel another view direction structure schematic diagram shows that the utility model discloses a control wheel and separate rotation part cooperation structure schematic diagram shows that the utility model discloses an upper pressing plate structure schematic diagram shows that the utility model discloses a lower pressing plate structure schematic diagram.

[0035] Reference Signs:

[0036] 1、Bottom gear box, 10, rectangular box body, 11, mounting hole, 12, support ear, 2, middle installation box, 20, installation platform, 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 rotation shaft, 70, upper pressing plate, 701, cylindrical body, 702, inner groove, 703, boss, 704, center through hole, 705, peripheral through hole, 71, lower pressing plate, 711, first cylindrical body, 712, second cylindrical body, 713, edge hole, 714, center hole, 72, fastening screw, 73, shoulder, 8, worm, 80, worm wheel, 81, first transmission tooth, 82, first rotation shaft, 83, second transmission tooth, 84, second rotation shaft, 85, third transmission tooth, 86, fourth transmission tooth. DETAILED DESCRIPTION

[0037] The utility model provides a kind of stopper, the structure of the stopper is completely different from the stopper structure of prior art, the function realized is the stroke limit of electric hoist, the lifting height limit of electric hoist can be realized by installing the stopper in electric hoist.The utility model can be adjusted limit according to the lifting height of electric hoist used by user, can be customized to realize the limit of electric hoist lifting height, strong applicability, wide practical range, and whole structure is simple, easy to adjust.

[0038] The structure and principle of the utility model will be described in detail in combination with specific embodiments and drawings:

[0039] The embodiment provides a kind of stopper, the stopper includes auxiliary component and core component:

[0040] Auxiliary component includes bottom gear box 1, middle installation box 2 and top cover 3, bottom gear box 1, middle installation box 2 and top cover 3 are connected by bolt, bottom gear box 1 and middle installation box 2 form a closed space, and middle installation box 2 and top cover 3 form a closed space.

[0041] Bottom gear box 1 includes rectangular box body 10, rectangular box body 10 side is provided with mounting hole 11, mounting hole 11 penetrates rectangular box body 10, and is communicated with the internal space of rectangular box body 10, rectangular box body 10 is provided with support ear 12 and multiple support holes in the inside, support ear 12 is provided with through hole, and the height of the through hole of support ear 12 is flush with the height of mounting hole 11.Middle installation box 2 is a rectangular frame, is provided with mounting table 20 in the inside, is provided with screw hole 21 on mounting table, and top cover 3 is a rectangular cover.

[0042] Core component includes transmission component, synchronous rotation component, single rotation component, multiple control wheels 4 and multiple travel switches 5, the number of control wheel 4 is same with the number of travel switch 5, multiple control wheels 4 are stacked together, multiple travel switches 5 are stacked together, one control wheel 4 corresponds to one travel switch 5, and the number of control wheel 4 and travel switch 5 is related to the set travel control.

[0043] In the embodiment, we set that electric hoist has four travels, is fast rise, slow rise, fast drop and slow drop respectively, of course, can be more than four travels, or less than four travels, such as only fast rise and fast drop, electric hoist sets four travels, so travel switch corresponds four, from top to bottom, in turn, fast rise travel switch, slow rise travel switch, fast drop travel switch, slow drop travel switch, of course, can be other order, four travel switches are fixed by two screws, two screws are fixed and installed after passing through four travel switches and being screwed into the screw hole 21 on the mounting table of middle installation box 2.

[0044] Since the present embodiment sets four travel switches, the corresponding control wheels are also four.

[0045] The control wheel 4 comprises 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 which penetrates the cylindrical wheel 40, the top end of the cylindrical wheel 40 protrudes from the cam 40 to form a boss surface, the bottom end is concave in the cam 40, the travel is 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] The structure design of the control wheel 4 facilitates the stacking of the control wheels up and down, when the control wheels are stacked, the boss surface of the control wheel located below is inserted into the concave surface of the control wheel located above, and the sizes are matched, so that the control wheels are stacked together to form a control wheel body. When the control wheel rotates alone, it also limits the rotation of the control wheel alone, ensuring the concentric rotation of the control wheel.

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

[0048] The cylindrical part 411 drives the boss part 412 to rotate when rotating, and the boss part 402 touches the corresponding travel switch to generate a trigger signal of the travel switch.

[0049] In order to realize the independent rotation of the control wheel 4, each control wheel 4 is independently matched with a single rotation component, and one single rotation component drives one control wheel to rotate.

[0050] The single rotation component comprises a driving shaft 6 and a driving tooth 60 mounted on the driving shaft 6, the driving tooth 60 is engaged with the gear groove 42 of the control wheel, and one driving shaft 6 drives one control wheel to rotate. The upper end of the driving shaft 6 is provided with a T-shaped or star-shaped notch, so as to rotate the driving shaft with a T-shaped or star-shaped turning tool.

[0051] In order to realize the synchronous rotation of the control wheel, a synchronous rotation component is needed to drive the four control wheels to rotate synchronously and concentrically.

[0052] The synchronous rotating part comprises a third rotating shaft 7, an upper pressing plate 70, a lower pressing plate 71 and a fastening screw 72. The third rotating shaft 7 is provided with a shoulder 73. The lower pressing plate 71 abuts against the shoulder 73 and the downward displacement of the lower pressing plate 71 is limited by the shoulder 73. The third rotating shaft 7 is provided with a threaded hole at the top. The threaded hole extends axially and is adapted to the thread of the fastening screw 72. The plurality of control wheels 4 are placed between the upper pressing plate 70 and the lower pressing plate 71 after being overlapped. The fastening screw 72 is screwed into the threaded hole of the third rotating shaft 7 after passing through the upper pressing plate 70. The upward displacement of the upper pressing plate is limited by the fastening screw. Thus, the plurality of control wheels 4 can be positioned between the upper pressing plate 70 and the lower pressing plate 71.

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

[0054] The upper pressing plate 70 comprises a cylindrical body 701. The cylindrical body 701 is provided with an inner groove 702 at the bottom and a boss 703 at the top. The cylindrical body 701 is provided with a central through hole 704 and a plurality of peripheral through holes 705 around the central through hole 704. The central through hole 704 and the peripheral through holes 705 all pass through the cylindrical body 701. The central through hole 704 is provided for the fastening screw 72 to pass through, so as to limit the upward movement of the upper pressing plate 70 by the fastening screw. The peripheral through holes 705 are provided for the driving shafts to pass through. In this example, there are four peripheral through holes 705 and four driving shafts pass through the four peripheral through holes respectively.

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

[0056] The lower pressing plate 71 comprises 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 that of the second cylindrical body 712. The first cylindrical body 711 is provided with a plurality of edge holes 713 and a central hole 714. The edge holes 713 pass through the first cylindrical body 711 and the central hole 714 passes through 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. The edge holes 713 are provided for the driving shafts to be inserted. Thus, there are four edge holes and four driving shafts are inserted respectively to position the driving shafts. The central hole is provided for the third rotating shaft 7 to pass through. Thus, 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 that the top end of the cylindrical wheel of the control wheel located at the lowermost position extends into the cam of the upper control wheel, the cylindrical wheel of the control wheel located at the uppermost position extends into the groove in the upper pressing plate, the first cylindrical body of the lower pressing plate extends into the cam of the control wheel located at the lowermost position, the upper end of the driving shaft extends through the circumferential through hole in the upper pressing plate, protrudes from the upper pressing plate, and the lower end extends into the edge hole in the lower pressing plate, after the plurality of driving shafts are installed, the driving teeth on one of the driving shafts correspond to the gear groove of one of the control wheels, the third rotating shaft extends through the central hole of the lower pressing plate, the fastening screw extends through the upper pressing plate and is screwed into the threaded hole of the third rotating shaft, and the plurality of control wheels stacked together are limited between the upper pressing plate and the lower pressing plate.

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

[0059] The worm 8 is rotatably installed on the mounting hole 11 of the bottom gear box through a bearing or a shaft sleeve, one end of the worm 8 extends out of the mounting hole 11 and extends through the through hole of the supporting lug 12, so that the worm 8 is installed on the bottom gear box, one end is supported through the supporting lug 12, and the other end is supported through the mounting hole 11, the top of the first rotating shaft 82, the second rotating shaft 84 and the third rotating shaft 7 is installed on the middle installation box 2, and the bottom is installed in the supporting hole of the bottom gear box 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 extends through the middle installation box 2, the lower end is located in the bottom gear box 1, and the upper end is located in the top cover 3.

[0060] After installation, the worm 8, the worm wheel 80, the first transmission teeth 81, the first rotating shaft 82, the second transmission teeth 83, the second rotating shaft 84, the third transmission teeth 85, the fourth transmission teeth 86 and the lower end of the third rotating shaft are located in the closed space formed by the bottom gear box 1 and the middle installation 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 closed space formed by the middle installation box 2 and the top cover 3.

[0061] After installation, align the cams 40 of the four control wheels 4 and tighten the fastening screws. At this point, the control wheels can only rotate synchronously through the rotation of the worm gear. This completes the assembly of a limit switch. To improve the applicability and usability of the limit switch, we can set limit switches with different transmission ratios. Their structures are identical; the only difference is the gear transmission ratio. Different transmission ratio limit switches can be selected based on the user's limit height. After selecting a suitable transmission ratio limit switch, loosen the fastening screws and use a screwdriver to drive the drive shaft. The drive shaft controls the four control wheels, rotating each control wheel individually until the cams are no longer aligned. Then tighten the fastening screws and install the limit switch in the electric hoist. The worm gear is connected to the gearbox of the electric hoist. The rotation of the electric hoist's motor is transmitted to the worm gear through the gearbox. The worm gear 8 drives the worm wheel 80, which in turn drives the first rotating shaft 82, causing the first transmission gear to rotate. This, in turn, drives the second transmission gear 83, which in turn drives the second rotating shaft 84. The rotation of the second rotating shaft 84 drives the third transmission gear 85 to rotate, which in turn drives the fourth transmission gear 86 to rotate, and finally drives the third rotating shaft 7 to rotate. Since the upper and lower pressure plates press all the control wheels together, the rotation of the third rotating shaft 7 will drive all the control wheels to rotate synchronously and concentrically. In this way, the control wheel of the limiter will rotate with the rotation of the electric hoist motor. Since the initial angle of each control wheel has been adjusted beforehand, after synchronous rotation, the time when each control wheel touches the corresponding limit switch will be different. Once a control wheel touches the corresponding limit switch, the corresponding signal will be triggered, and the controller will receive the signal from the corresponding limit switch and close the corresponding limit. In this embodiment, four travel distances are provided: fast lift, slow lift, fast descent, and slow descent. These four travel distances correspond to four limit switches. When the fast lift limit switch is activated, it sends a stop signal to the electric hoist's controller. Upon receiving the stop signal, the controller stops the electric hoist's fast lift, allowing it to rise slowly. Similarly, when the slow lift limit switch is activated, the controller stops the slow lift, and the electric hoist stops rising. The same principle applies to fast and slow descent, stopping the hoist's descent. This achieves limit control of the entire electric hoist's travel distance, preventing overtravel and potential safety accidents. Because this embodiment provides four travel distances (fast lift, slow lift, fast descent, and slow descent), it allows for gradual speed reduction control of the electric hoist, minimizing damage to the motor. The limit switch provided in this embodiment achieves limit control of the electric hoist through a few transmission gears and control wheels. Its simple structure and ease of control reduce the size of the limit switch, facilitating installation and use.The position limiter provided by the embodiment can select position limiters with different transmission ratios according to the position limiting height of a user, and then the control of multiple strokes can be realized by separately adjusting the angle of the control wheel, and finally the position limiting purpose is achieved, the position limiting can be adjusted according to the lifting height of the electric hoist used by the user, the position limiting of the lifting height of the electric hoist can be customized, and the applicability is stronger.

[0062] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the utility model, but not to limit them; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: the technical solutions recorded in the foregoing embodiments can still be modified, or part or all of the technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should be covered in the scope of the claims and the description of the utility model.

Claims

1. A limiter characterized by: The transmission component, the synchronous rotating component, the single rotating component, the plurality of control wheels and the plurality of travel switches, the number of control wheels is same as the number of travel switches, the plurality of control wheels are stacked together, the plurality of travel switches are stacked together, one control wheel corresponds to one travel switch, The single rotating component has a plurality of single rotating components, the number of single rotating components is same as the number of control wheels, one single rotating component drives one control wheel to rotate, The transmission component is connected with the synchronous rotating component, the transmission component drives the synchronous rotating component to rotate, the synchronous rotating component drives the plurality of control wheels to rotate synchronously.

2. A limiter according to claim 1, characterised in that: The control wheel comprises 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, the bottom end is recessed in the cam, and the cross-sectional diameter of the cylindrical wheel is smaller than the cross-sectional diameter of the cam.

3. A limiter according to claim 2, wherein: The single rotating component comprises a drive shaft and a drive tooth mounted on the drive shaft, the drive tooth is engaged with the gear groove, one control wheel is provided with one drive shaft, and one drive shaft drives one control wheel to rotate.

4. The position limiter of claim 1, wherein: The synchronous rotating component comprises a third rotating shaft, an upper pressing plate, a lower pressing plate and a fastening screw, the third rotating shaft is provided with a shoulder, the lower pressing plate abuts against the shoulder, the top of the third rotating shaft is provided with a threaded hole extending in the axial direction, the threaded hole is matched with the thread of the fastening screw, the plurality of control wheels are placed between the upper pressing plate and the lower pressing plate after being stacked, and the fastening screw is screwed into the threaded hole of the third rotating shaft after passing through the upper pressing plate, so that the plurality of control wheels are limited between the upper pressing plate and the lower pressing plate.

5. A limiter according to claim 4, wherein: The upper pressing plate comprises a cylindrical body, the bottom of the cylindrical body is provided with an inner recess, the top is provided with a boss, the cylindrical body is provided with a central through hole, and a plurality of peripheral through holes are arranged around the central through hole, and the central through hole and the peripheral through hole penetrate the cylindrical body.

6. A limiter according to claim 4, wherein: The lower pressing plate comprises 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, a plurality of edge holes and a central hole are arranged 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.

7. A limiter according to claim 4, wherein: The transmission component comprises 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 engaged with the worm, the first transmission tooth and the worm wheel are mounted 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 mounted on the second rotating shaft, the third transmission tooth is located above the second transmission tooth, the second transmission tooth is engaged with the first transmission tooth, the third transmission tooth and the fourth transmission tooth are engaged, and the fourth transmission tooth is mounted on the third rotating shaft.

8. The position limiter of claim 1, wherein: It also comprises a bottom gear box, a middle installation box and a top cover, the bottom gear box is fixed below the middle installation box by bolts, and the top cover is fixed above the middle installation box by bolts.

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