Material elevator

Abstract

The utility model discloses a material hoister, which belongs to material hoisting devices, solves the problem that the existing large hoisting equipment is not suitable for hoisting light materials with electromagnetic interference prevention requirements, and adopts a hand-cranking hoist as power of a traction device, the hand-cranking hoist is fixed on a fixed portal frame, a first pulley is arranged at the upper part of the fixed portal frame, and a second pulley is arranged at the lower part of the fixed portal frame. The lifting pulley is arranged on the lower portion of the movable door frame, the first pulley is higher than the lifting pulley, the first pulling rope is wound around the first pulley and the lifting pulley, one end of the first pulling rope is fixed to the hand hoist, the other end of the first pulling rope is fixed to the bottom frame or the fixed door frame, and the second pulley is arranged on the upper portion of the movable door frame. The second pulling rope is wound around the second pulley, one end of the second pulling rope is fixed to the lifting platform, and the other end of the second pulling rope is fixed to the bottom frame or the fixed door frame. The lifting platform is lifted by shaking the hand-cranking hoist so as to lift materials. The material elevator does not use electric power, has no electromagnetic interference and is light and convenient to use.

Description

TECHNICAL FIELD

[0001] The utility model belongs to material hoist, especially the material hoist can be folded, and it is convenient to carry and light to use. BACKGROUND

[0002] In manufacturing industry, such as: medical instrument manufacturing, pharmacy, chip manufacturing, aviation and aerospace industry, there are often materials to be lifted to a certain height. These materials are not heavy, but it is laborious to lift by manpower. Especially when it needs to stay at a certain height, it is more difficult. Large hoisting equipment cannot be used due to limited space, or cannot be coordinated with the surrounding environment, or electromagnetic interference and other factors. Therefore, a light, electromagnetic interference-free material hoist is needed to undertake specific lifting tasks. SUMMARY

[0003] The utility model aims at overcoming the defects that the existing large hoisting equipment is not suitable for lifting light materials or needs to stay at a certain height due to limited space, cannot be coordinated with the surrounding environment, produces electromagnetic interference and other factors, and provides a light, electromagnetic interference-free material hoist to undertake specific lifting tasks.

[0004] To achieve the above-mentioned purpose, the utility model discloses a material hoist, which comprises:

[0005] A chassis comprising a frame body and two support legs respectively extending forward from the left and right sides of the frame body and being foldable and reversible, and the chassis is provided with traveling wheels;

[0006] A fixed gantry fixedly arranged on the chassis and having two parallel and upright first tracks;

[0007] A movable gantry arranged on the first tracks in a liftable manner and having two parallel and upright second tracks;

[0008] A lifting platform arranged on the second tracks in a liftable manner, reversibly and foldably extending forward from the movable gantry and being located above the support legs;

[0009] A traction device comprising a hand-operated hoist, a first traction rope, a first pulley, a lifting pulley, a second traction rope and a second pulley, the hand-operated hoist is fixed on the chassis or the fixed gantry, the first pulley is arranged on the upper part of the fixed gantry, the lifting pulley is arranged on the lower part of the movable gantry, the position of the first pulley is higher than that of the lifting pulley, the first traction rope is wound around the first pulley and the lifting pulley, one end of the first traction rope is fixed on the hand-operated hoist, the other end of the first traction rope is fixed on the chassis or the fixed gantry, the second pulley is arranged on the upper part of the movable gantry, the second traction rope is wound around the second pulley, one end of the second traction rope is fixed on the lifting platform, and the other end of the second traction rope is fixed on the chassis or the fixed gantry.

[0010] The material lifting machine is foldable, portable, and easy to use. The material lifting machine uses a hand-operated hoist as power without using electricity, and has no electromagnetic interference. The material lifting machine is completely a mechanical structure, and will not cause interference to the working place and the lifted material. The material lifting machine is suitable for various places where the material needs to be lifted, and is coordinated with the surrounding environment. The material lifting machine can keep the material placed on the lifting platform at the required height by the self-locking function of the hand-operated hoist, and is safe and reliable.

[0011] Preferably, the first pulley, the lifting pulley and the second pulley each include two left and right arranged ones. Accordingly, the movable gantry and the lifting platform can be stably lifted and balanced during lifting without shaking.

[0012] Preferably, the traction device further includes a guide wheel, and the first traction rope passes through the guide wheel, the first pulley and the lifting pulley in sequence from the hand-operated hoist. Accordingly, the first traction rope is arranged reasonably, and the material is lifted efficiently and stably.

[0013] Preferably, the support leg is assembled to the frame body through the first shaft to realize the folding thereof; the base frame or / and the fixed gantry is provided with a first positioning member capable of swinging laterally, the first positioning member has a positioning groove, the first positioning member leans against the support leg by the elastic force of a first spring and the positioning groove clamps the support leg to prevent the support leg from being folded upward, the first positioning member is swung away from the support leg by overcoming the elastic force of the first spring to allow the support leg to be folded upward. Accordingly, the support leg is conveniently folded. In particular, when the support leg is converted from the folded state to the working state, the first positioning member has an automatic error correction function, which ensures that the support is in place and effectively prevents the whole machine from being unstable.

[0014] Preferably, the frame body or / and the fixed gantry is provided with a fixed second positioning member; the support leg is positioned between the first positioning member and the second positioning member, and the second positioning member prevents the support leg from being folded downward; the second positioning member serves as a parking positioning point of the support leg when the support leg is folded. Accordingly, the support leg can be reliably positioned to maintain the stability of the material lifting machine. The support leg is accurately folded and positioned when the support leg is folded.

[0015] Preferably, the walking wheel includes a directional wheel and a universal wheel, the directional wheel is assembled to the first shaft of the base frame, and the universal wheel is assembled to the front part of the support leg. Accordingly, the universal wheel can realize flexible steering of the material lifting machine. The directional wheel maintains the stability of the material lifting machine during walking and static state, and provides support for the material lifting machine when the support leg is folded.

[0016] Preferably, the lifting pulley is arranged on the wheel frame, and a falling prevention device is arranged on the movable gantry, the falling prevention device comprising a chain, a first sprocket, a second sprocket, a connecting rod and a second spring, the chain extending up and down and arranged on the fixed gantry, the first sprocket and the second sprocket being rotatably arranged on the movable gantry and oppositely located on two sides of the chain, the first sprocket being in engagement with the chain, and the second sprocket being connected to the wheel frame through the connecting rod; when the first traction rope maintains tension, the connecting rod pulls the second sprocket away from the chain to enable the movable gantry to be lifted by the first traction rope; when the tension of the first traction rope disappears, the second spring urges the second sprocket to be in engagement with the chain, and the first sprocket and the second sprocket are simultaneously in engagement with the chain to clamp the chain and prevent the movable gantry from descending. Once the first traction rope is broken, the movable gantry can be clamped at a certain height to prevent the movable gantry from descending and to prevent people and materials from being injured due to falling.

[0017] Preferably, the falling prevention device comprises a blocking block, a part of the circumference of the second sprocket is distributed with chain teeth, and the rest of the circumference is a small-diameter avoiding portion, an eccentric part of the second sprocket is connected to the wheel frame through the connecting rod; when the first traction rope maintains tension, the connecting rod pulls the second sprocket to pull the chain teeth of the second sprocket away from the chain, the second sprocket is disengaged from the chain through the small-diameter avoiding portion, the chain teeth of the second sprocket abut against the blocking block, and the movable gantry is lifted by the first traction rope; when the tension of the first traction rope disappears, the second spring pulls the second sprocket to urge the chain teeth of the second sprocket to be in engagement with the chain, and the first sprocket and the second sprocket are simultaneously in engagement with the chain to clamp the chain and prevent the movable gantry from descending. The structure is compact and flexible in operation.

[0018] Preferably, the supporting leg is provided with a first pin hole, and when the supporting leg is turned over to be in a folded state, a first positioning pin is inserted into the first pin hole to position the supporting leg. Accidents caused by accidental turning over of the supporting leg are avoided.

[0019] Preferably, the lifting platform comprises a lifting frame and a load-carrying platform, the lifting frame is arranged on the second track in a lifting manner, and the load-carrying platform is rotatably arranged on the lifting frame through a second shaft, the load-carrying platform is provided with a second pin hole, and when the load-carrying platform is turned over to be in a folded state, a second positioning pin is inserted into the second pin hole to position the load-carrying platform. Accidents caused by accidental turning over of the load-carrying platform are avoided. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a side view of the material lifting machine of the utility model;

[0021] Figure 2 It is a front view of the material lifting machine from the left to the right view angle; Figure 1

[0022] It is an enlarged view of the local section of A-A in the figure; Figure 3 Figure 2 It is an enlarged view of the local section of A-A in the figure;

[0023] Figure 4 Figure 2 ​​B-B in FIG. 1 is a local cross-sectional enlarged view;

[0024] Figure 5 FIG. 1 is a schematic diagram of a fixed gantry; Figure 1 FIG. 2 is a schematic diagram of a movable gantry;

[0025] Figure 6 FIG. 3 is a schematic diagram of a lifting platform; Figure 1 FIG. 4 is a schematic diagram of a fixed gantry;

[0026] Figure 7 FIG. 5 is a schematic diagram of a movable gantry; Figure 1 FIG. 6 is a schematic diagram of a lifting platform;

[0027] Figure 8 FIG. 7 is a schematic diagram of a lifting platform; Figure 1 FIG. 8 is a schematic diagram of a lifting platform;

[0028] Figure 9 FIG. 9 is a schematic diagram of a first traction rope; Figure 8 FIG. 10 is a schematic diagram of a fall arrest device;

[0029] Figure 10 FIG. 11 is a schematic diagram of a fall arrest device; Figure 1 FIG. 12 is a schematic diagram of a fall arrest device;

[0030] Figure 11 FIG. 13 is a schematic diagram of a fall arrest device; Figure 1 FIG. 14 is a schematic diagram of a fall arrest device;

[0031] Figure 12 FIG. 15 is a schematic diagram of a fall arrest device; Figure 11 FIG. 16 is a schematic diagram of a fall arrest device;

[0032] Figure 13 FIG. 17 is a schematic diagram of a fall arrest device; Figure 11 FIG. 18 is a schematic diagram of a fall arrest device;

[0033] Figure 14 FIG. 19 is a cross-sectional view of C-C in FIG. 1; Figure 13 FIG. 20 is a schematic diagram of a fall arrest device in a fall arrest state;

[0034] Figure 15 FIG. 21 is a schematic diagram of a fall arrest device in a fall arrest state; Figure 14 FIG. 22 is a schematic diagram of a fall arrest device in a fall arrest state;

[0035] Explanation of reference numerals in the drawings:

[0036] 100 base frame: 110 frame body, 111 first positioning pin, 120 support leg, 121 first shaft, 122 first pin hole, 130 first positioning member, 131 positioning groove, 132 support seat, 133 first spring, 140 second positioning member, 150 directional wheel, 160 universal wheel, 170 support flange;

[0037] 200 fixed gantry: 210 first rail, 220 upper crosspiece, 230 middle crosspiece, 240 lower crosspiece, 250 first roller set;

[0038] 300 movable gantry: 310 second track, 320 upper crosspiece, 330 middle crosspiece, 340 lower crosspiece, 350 second roller set, 360 wheel frame;

[0039] 400 lifting platform: 410 lifting frame, 411 third roller set, 412 second shaft, 413 second positioning pin, 420 object carrying platform, 421 second pin hole;

[0040] 500 traction device: 510 hand-operated hoist, 520 first traction rope, 530 first pulley, 540 lifting pulley, 550 guide wheel, 560 second traction rope, 570 second pulley;

[0041] 600 anti-falling device: 610 chain, 620 first sprocket, 630 second sprocket, 631 chain tooth, 632 small-diameter avoiding part, 640 connecting rod, 650 second spring, 660 blocking block. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical scheme and advantages of the utility model more clear, the technical scheme in the utility model embodiment will be described clearly and completely below in combination with the drawings in the utility model embodiment. Obviously, the described embodiment is a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0043] The terms "include" and "have" and any variations thereof in the specification and claims of the utility model are intended to cover the non-exclusive inclusion, for example, a method or product including a series of technical features does not have to be limited to those clearly listed, and other technical features not clearly listed can also be included in the method or product.

[0044] In the description of the utility model, it is understood that the orientation or position relationship indicated by the terms "upper", "lower", "left", "right" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. Among them, the directions of "upper" and "lower", "left" and "right", "front" and "back" are opposite.

[0045] In the description of the utility model, it is understood that the technical features defined by the terms "first", "second" and the like with the order concept, only for the sake of clearly describing the defined technical features, so that the defined technical features can be clearly distinguished from other technical features, and do not represent the actual implementation of such naming, therefore, it can not be understood as the limitation of the utility model.

[0046] The utility model will be described in detail below in combination with specific embodiments and drawings.

[0047] Figures 1-2 A material lifting machine is shown, which is used for lifting and carrying materials. The material lifting machine comprises a chassis 100, a fixed portal 200, a movable portal 300, a lifting platform 400, a traction device 500 and an anti-falling device 600.

[0048] The chassis 100 is mainly used as the support of the whole machine on the ground. As shown in the drawings, Figure 5 The chassis 100 comprises a frame body 110 and two support legs 120 which are respectively extended forward from the left and right sides of the frame body and can be turned and folded. The chassis is provided with traveling wheels.

[0049] The support leg 120 is assembled on the frame body 110 through a first shaft 121 to realize the turning and folding thereof. As shown in the drawings, Figure 3 The frame body 110 of the chassis, the first track 210 of the fixed portal and the support 132 are fixed together, a first positioning member 130 which can swing laterally is assembled on the support 132 in a rotating manner, the first positioning member 130 has a positioning groove 131, the first positioning member 130 leans on the support leg 120 by the elastic force of a first spring 133 and makes the positioning groove 131 clamp the support leg 120 to prevent the support leg from turning and folding upward. The first positioning member 130 is swung as shown by the dotted line in the drawings, Figure 3 The elastic force of the first spring 133 is overcome to make the first positioning member 130 swing away from the support leg, so that the positioning groove 131 is removed from the support leg to allow the support leg to turn and fold upward.

[0050] And, as shown in the drawings, Figure 1 , Figure 5 The frame body 110 is provided with a fixed second positioning member 140. Since the fixed portal 200 and the frame body 100 are fixed together, the second positioning member can also be fixed to the fixed portal. The support leg 120 is positioned between the first positioning member 130 and the second positioning member 140, and the second positioning member 140 prevents the support leg from turning downward. The second positioning member 140 serves as the parking positioning point of the support leg when the support leg turns and folds upward. Accordingly, the support leg can be reliably positioned to maintain the stability of the material lifting machine. The support leg can be accurately turned and positioned when folding.

[0051] Among them, as shown in the drawings, Figure 1 , Figure 5As shown, the traveling wheels include directional wheels 150 and omnidirectional wheels 160. The directional wheels 150 are mounted on the first axle 121 of the base frame, and the omnidirectional wheels 160 are mounted on the front of the outriggers 120. Accordingly, the omnidirectional wheels enable flexible steering of the material hoist. The directional wheels maintain the stability of the material hoist when moving and stationary, and provide support for the material hoist when the outriggers are flipped or folded. A support flange 17 is also provided at the front of the outriggers 120, which can support the omnidirectional wheels off the bottom surface, ensuring stability of the material hoist when stationary.

[0052] In the illustrated structure, the outrigger 120 is provided with a first pin hole 122. When the outrigger is flipped into a folded state, the first positioning pin 111 on the frame 110 is inserted into the first pin hole 122 to position the outrigger. This prevents the outrigger from accidentally flipping over and causing an accident.

[0053] like Figure 6 As shown, the fixed gantry 200 is square-shaped and has two parallel and upright first tracks 210. The cross-section of the first track is as shown. Figure 4 As shown, it is S-shaped. The fixed gantry is fixedly assembled to the base frame via the first track. In order to ensure the structural strength of the fixed gantry, the upper crossbar 220, the middle crossbar 230 and the lower crossbar 240 are welded between the two first tracks. The upper crossbar 220 also serves as the mounting base for the first pulley 530, and the middle crossbar 230 also serves as the mounting base for the hand-cranked hoist 510.

[0054] like Figure 7 As shown, the movable gantry 300 is square-shaped and has two parallel and upright second tracks 310. The cross-section of the second track 310 is shown in the figure. Figure 4 As shown, it is S-shaped. The second track 310 is as follows... Figure 4 The second track 310, which mates with the first track 210, slides and rises relative to the first track via a roller assembly between the second track 310 and the first track 210, thereby enabling the movable gantry to be heightably mounted on the first track. In the illustrated structure, a first roller assembly 250 is installed at the upper end of the first track, and a second roller assembly 350 is installed at the upper end of the second track. When the second track 310 is assembled with the first track 210, the second roller assembly 350 is located below the first roller assembly 250, thus preventing the second track from detaching from the upper end of the first track. To ensure the structural strength of the movable gantry, an upper crossbar 320, a middle crossbar 330, and a lower crossbar 340 are welded between the two second tracks. The upper crossbar 320 also serves as the mounting base for the second pulley 570, and the lower crossbar 340 also serves as the mounting base for the anti-fall device 600.

[0055] like Figures 8-9 As shown, the lifting platform 400 includes a lifting frame 410 and a loading platform 420, the lifting frame 410 as follows: Figure 4The shown by the third roller group 411 is configured in the second track 310, the carrier platform 420 is rotatably assembled on the lifting frame 410 through the second shaft 412 and can be folded and extended forward from the movable gantry and above the supporting leg 120, the carrier platform 420 has a second pin hole 421, and the second positioning pin 413 on the lifting frame 410 is inserted into the second pin hole 421 when the carrier platform is folded to position the carrier platform. Avoid accidental folding of the carrier platform.

[0056] As shown in Figure 1 , Figure 10 The traction device 500 includes a hand-operated hoist 510, a first traction rope 520, two first pulleys 530, two lifting pulleys 540, two guide wheels 550, a second traction rope 560, and three second pulleys 570.

[0057] The hand-operated hoist 510 is fixed to the middle crosspiece 230 of the fixed gantry 200 as shown in Figure 6 , and can also be fixed to the base frame since the fixed gantry is fixedly assembled with the base frame.

[0058] The two first pulleys 530 are assembled on the upper crosspiece 220 of the fixed gantry 200 and are separated left and right as shown in Figure 6 .

[0059] The two lifting pulleys 540 are configured on the wheel frame 360 as shown in Figure 7 , and the wheel frame 360 is configured on the movable gantry 300 to lift the lifting pulleys 540, the wheel frame 360, and the movable gantry 300 by the first traction rope 520. In the structure shown in the figure, the wheel frame 360 is located on the upper side of the middle crosspiece 330 of the movable gantry 300 and is connected with the anti-falling device 600, which is configured on the middle crosspiece 330 of the movable gantry as described below. When the anti-falling device is not needed, the wheel frame can be directly fixedly connected with the movable gantry.

[0060] The position of the first pulley 530 is higher than that of the lifting pulley 540, so that the lifting pulley 540 can be lifted or lowered by the first traction rope 520 around the first pulley 530, and then the movable gantry is lifted by the lifting pulley 540.

[0061] The first traction rope 520 is preferably a steel wire rope. The first traction rope 520 is wound around the two guide wheels 550, the two first pulleys 530, and the two lifting pulleys 540 in sequence from the hand-operated hoist 510. One end of the first traction rope 520 is fixed to the hand-operated hoist 510, and the other end of the first traction rope 520 is fixed to the frame body 110 of the base frame. Since the fixed gantry is fixedly assembled with the frame, the other end of the first traction rope 520 can also be fixed to a suitable position of the fixed gantry. The two guide wheels 550 are also assembled on the frame body 110 of the base frame.

[0062] Three second pulleys 570 are sprocket wheels, which are installed on the upper crosspiece 320 of the movable gantry 300 and are kept at left, middle and right intervals, as shown in the figure. Figure 7 Three second traction ropes 560 are chains, which are wound around the corresponding second pulleys 570 respectively, and one end of each second traction rope 560 is fixed to the lifting frame 410 of the lifting platform, and the other end is fixed to the upper crosspiece 320 of the fixed gantry 200. In addition, the middle second traction rope is offset to the rear side of the fixed position of the fixed gantry compared with the other two second traction ropes, which has a safety protection effect.

[0063] In view of the above structure, the lifting of the lifting platform is realized by shaking the hand-operated hoist: when the hand-operated hoist winds the first traction rope, the movable gantry is lifted, and at the same time the lifting platform is lifted by the second traction rope. When the hand-operated hoist releases the first traction rope, the movable gantry is lowered, and at the same time the lifting platform is lowered by the second traction rope.

[0064] The material lifting machine has foldable legs and a lifting platform, which is convenient to carry in and out of the work site and easy to use. The material lifting machine does not use electricity, but uses a hand-operated hoist as power, has no electromagnetic interference, is completely a mechanical structure, and will not cause interference to the work site and the lifted materials, and is suitable for various places where materials need to be lifted. The material lifting machine can keep the materials placed on the lifting platform at the required height by the self-locking function of the hand-operated hoist, which is safe and reliable.

[0065] As shown in the figure, Figures 11-15 The anti-falling device 600 includes a chain 610, a first sprocket wheel 620, a second sprocket wheel 630, a connecting rod 640 and a second spring 650. As shown in the figure, Figure 6 The upper end of the chain 610 is fixed to the upper crosspiece 220 of the fixed gantry 200, and the lower end is fixed to the lower crosspiece 240 of the fixed gantry, so that the chain is arranged in an up-down extending manner in the fixed gantry. The first sprocket wheel 620 and the second sprocket wheel 630 are rotatably assembled on the lower crosspiece 340 of the movable gantry 300 and are located on the left and right sides of the chain 610 respectively. The first sprocket wheel 620 is kept in engagement with the chain 610. The second sprocket wheel 630 is connected to the wheel frame 360 through the connecting rod 640.

[0066] When the materials are normally lifted or lowered, the first traction rope 520 keeps tension, as shown in the figure, Figure 14 The wheel frame 360 pulls the second sprocket wheel 630 away from the chain 610 through the connecting rod 640, so that the first traction rope can pull the movable gantry to lift or lower, and the first sprocket wheel 620 rises and falls with the movable gantry and keeps engagement with the chain 610 to rotate along the chain 610.

[0067] When the first traction rope tension disappears, the wheel frame 360 cannot pull the second sprocket 630 away from the chain 610 through the connecting rod 640, and the second spring 650 urges the second sprocket 630 to keep engaging with the chain 610, as shown in Figure 15 Fig. 6, at this time, the first sprocket 620 and the second sprocket 630 simultaneously engage with the chain 610 to stop the chain 610 from descending, thus, once the first traction rope breaks, the movable door frame can be stopped at a certain height to prevent the movable door frame from descending and to prevent people and materials from being injured due to falling.

[0068] Especially, the anti-falling device 600 comprises a blocking block 660. A part of the circumference of the second sprocket 630 is distributed with sprocket teeth 631, and the rest of the circumference is a small-diameter avoiding part 632. The eccentric part of the second sprocket 630 is connected to the wheel frame 360 through the connecting rod 640. When the first traction rope keeps tension, the connecting rod 640 pulls the second sprocket 630 to pull the sprocket teeth 631 of the second sprocket away from the chain 610, the small-diameter avoiding part 632 of the second sprocket 630 faces the chain and disengages from the chain, and the sprocket teeth 631 of the second sprocket 630 abut against the blocking block 660, as shown in Figure 14 Fig. 6, for the first traction rope to pull the movable door frame to ascend and descend. Once the first traction rope tension disappears (such as the first traction rope breaks), the second spring 650 urges the second sprocket 630, as shown in Figure 15 Fig. 6, to rotate the second sprocket counterclockwise by an angle a from the state shown in Figure 14 Fig. 6, to urge the sprocket teeth 631 of the second sprocket to keep engaging with the chain 610, and the first sprocket and the second sprocket simultaneously engage with the chain to stop the chain from descending, thus, the structure is compact and flexible in action.

[0069] The material lifting machine, the main structure and parts of the chassis 100, the fixed door frame 200, the movable door frame 300, the lifting platform 400, the traction device 500 and the anti-falling device 600 adopt lightweight design, such as aluminum alloy material, and the whole material lifting machine weighs less than 45 kg, and can lift materials below 90 kg in quality. The self weight of the material lifting machine is limited within the range that a single person can carry and on-site operation, and single-person operation can easily realize lifting operation.

[0070] The material lifting machine is in a working state, as shown in Figure 1 Fig. 1. In the figure, the lifting platform 400 is at a high position. By lowering the lifting platform 400 through the hand-operated hoist, the movable door frame 300 will also be lowered to the height range of the fixed door frame 200. When the lifting platform and the movable door frame are lowered, the load-carrying platform 420 and the supporting legs 120 can be turned over and folded to reduce the volume of the material lifting machine, facilitating storage and carrying.

Claims

1. A material hoist, characterized by The utility model relates to a kind of portable folding door and window cleaning machine, including: Chassis (100), it includes frame body (110) and two respectively from frame body left and right sides forwardly extending and can be turned over folding outrigger (120), chassis is equipped with traveling wheel; Fixed portal (200), it is fixedly arranged in chassis (100), it has two parallel and vertical first track (210); Movable portal (300), it is liftablely arranged in first track (210), it has two parallel and vertical second track (310); Lifting platform (400), it is liftablely arranged in second track (310), can be turned over foldingly from movable portal (300) forwardly extend and be located in the upper of outrigger (120); Traction device (500), it includes hand-operated hoist (510), first traction rope (520), first pulley (530), lifting pulley (540), second traction rope (560) and second pulley (570), hand-operated hoist (510) is fixed to chassis (100) or fixed portal (200), first pulley (530) is arranged in the upper portion of fixed portal (200), lifting pulley (540) is arranged in the lower portion of movable portal (300), the position of first pulley (530) is higher than the position of lifting pulley (540), first traction rope (520) is wound on first pulley (530), lifting pulley (540), one end of first traction rope (520) is fixed to hand-operated hoist (510), the other end of first traction rope (520) is fixed to chassis (100) or fixed portal (200), second pulley (570) is arranged in the upper portion of movable portal (300), second traction rope (560) is wound on second pulley (570), one end of second traction rope (560) is fixed to lifting platform (400), the other end of second traction rope (560) is fixed to chassis (100) or fixed portal (200).

2. The material hoist of claim 1, wherein: First pulley (530), lifting pulley (540) and second pulley (570) all include two left and right arrangements.

3. A material hoist according to claim 1 or 2, characterised in that: Traction device (500) further includes guide wheel (550), and first traction rope (520) is sequentially wound on guide wheel (550), first pulley (530) and lifting pulley (540) from hand-operated hoist (510).

4. The material hoist of claim 1, wherein: Outrigger (120) is assembled on frame body (110) through first shaft (121) to realize that it can be turned over folding;Chassis (100) or / and fixed portal (200) is equipped with first positioning member (130) that can swing sideways, first positioning member (130) has positioning groove (131), first positioning member (130) is kept on outrigger (120) by the elastic force of first spring (133) and makes positioning groove (131) to block outrigger (120) and prevent outrigger from turning over folding upward, first positioning member (130) is swung to the direction of avoiding outrigger (120) by overcoming the elastic force of first spring (133) and makes positioning groove (131) to withdraw from outrigger to allow outrigger to turn over folding upward.

5. The material hoist of claim 4, wherein: The frame body (110) or / and the fixed door frame (200) is provided with a fixed second positioning member (140); the supporting leg (120) is positioned between the first positioning member (130) and the second positioning member (140), and the second positioning member (140) prevents the supporting leg (120) from being turned down; the second positioning member (140) serves as a parking positioning point of the supporting leg when the supporting leg (120) is turned and folded.

6. A material hoist according to claim 4 or 5, characterised in that: The walking wheels include a directional wheel (150) and a universal wheel (160), the directional wheel (150) is assembled to the first shaft (121) of the underframe (100), and the universal wheel (160) is assembled to the front part of the supporting leg (120).

7. The material hoist of claim 1, wherein: The lifting pulley (540) is arranged on the wheel frame (360), and the anti-falling device (600) is arranged on the movable door frame, the anti-falling device (600) includes a chain (610), a first sprocket (620), a second sprocket (630), a connecting rod (640) and a second spring (650), the chain (610) extends up and down and is arranged on the fixed door frame (200), the first sprocket (620) and the second sprocket (630) are rotatably arranged on the movable door frame (300) and are located on the two sides of the chain (610) respectively, the first sprocket (620) is in engagement with the chain (610), and the second sprocket (630) is connected with the wheel frame (360) through the connecting rod (640); when the first traction rope (520) keeps tension, the connecting rod (640) pulls the second sprocket (630) away from the chain (610) to provide the first traction rope with a lifting force for lifting the movable door frame; when the tension of the first traction rope (520) disappears, the second spring (650) drives the second sprocket (630) to keep engagement with the chain (610), and the first sprocket (620) and the second sprocket (630) are simultaneously engaged with the chain (610) to block the chain and prevent the movable door frame from descending.

8. The material hoist of claim 7, wherein: The anti-falling device (600) includes a blocking block (660), a part of the circumference of the second sprocket (630) is provided with a chain tooth (631), and the remaining part of the circumference is provided with a small-diameter avoiding portion (632), the eccentric part of the second sprocket (630) is connected with the wheel frame (360) through the connecting rod (640); when the first traction rope (520) keeps tension, the connecting rod (640) pulls the second sprocket (630) to pull the chain tooth (631) of the second sprocket (630) away from the chain (610), the second sprocket (630) is disengaged from the chain (610) through the small-diameter avoiding portion (632) of the second sprocket (630), the chain tooth (631) of the second sprocket (630) abuts against the blocking block (660), and the first traction rope is provided with a lifting force for lifting the movable door frame; when the tension of the first traction rope (520) disappears, the second spring (650) pulls the second sprocket (630) to drive the chain tooth (631) of the second sprocket (630) to keep engagement with the chain (610), and the first sprocket (620) and the second sprocket (630) are simultaneously engaged with the chain (610) to block the chain and prevent the movable door frame from descending.

9. The material hoist of claim 1, wherein: The supporting leg (120) is provided with a first pin hole (122), and the first positioning pin (111) is inserted into the first pin hole (122) to position the supporting leg when the supporting leg (120) is turned and placed in a folded state.

10. The material hoist of claim 1 or 9, characterized by: The lifting platform (400) comprises a lifting frame (410) and a carrying platform (420), the lifting frame (410) is arranged on the second track (310) in a lifting manner, the carrying platform (420) is rotatably arranged on the lifting frame (410) through a second shaft (412), and the carrying platform (420) is provided with a second pin hole (421), and the carrying platform is positioned by inserting a second positioning pin (413) into the second pin hole (421) when the carrying platform is turned to a folding state.

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