阅读说明：本技术 一种能够稳定拆装精密模具的起重机 (Crane capable of stably disassembling and assembling precise die ) 是由 王丽华 于 2020-08-10 设计创作，主要内容包括：本发明公开了一种能够稳定拆装精密模具的起重机,包括机体,所述机体的底面固设有两个左右对称的支撑柱,所述支撑柱的底面转动设有两个前后对称的移动轮,所述机体内设有开口向下的起重腔,所述起重腔的左右壁间转动设有起重轴,所述起重轴的外周上固设有起重滚筒,所述起重滚筒的外周上固设有起重刺块,所述起重滚筒的外周上固设有起重链条,本发明采用链条和刺块的卡扣连接方式,能够防止链条在起重过程中,由于滚筒的光滑表面导致吊绳起重打滑的问题产生,同时,采用棘轮限制以及夹紧刹车紧急制动两种方式,能够极大的提升起重过程中由于模具过重。(The invention discloses a crane capable of stably dismounting a precision mold, which comprises a machine body, wherein two support columns which are bilaterally symmetrical are fixedly arranged on the bottom surface of the machine body, two moving wheels which are symmetrical front and back are rotationally arranged on the bottom surface of the supporting column, a hoisting cavity with a downward opening is arranged in the machine body, a hoisting shaft is rotatably arranged between the left wall and the right wall of the hoisting cavity, a hoisting roller is fixedly arranged on the periphery of the hoisting shaft, the invention adopts the buckling connection mode of the chain and the thorn block, can prevent the chain from being damaged during the lifting process, the problem that the hoisting of a lifting rope slips due to the smooth surface of the roller is solved, and meanwhile, the ratchet wheel is limited, the brake is clamped and the emergency brake is adopted, so that the hoisting process can be greatly improved due to the fact that the die is too heavy.)

1. The utility model provides a can stabilize hoist of accurate mould of dismouting, includes the organism, its characterized in that: the bottom surface of the machine body is fixedly provided with two bilaterally symmetrical supporting columns, the bottom surfaces of the supporting columns are rotationally provided with two moving wheels which are symmetrical front and back, a hoisting cavity with a downward opening is arranged in the machine body, a hoisting shaft is rotationally arranged between the left wall and the right wall of the hoisting cavity, a hoisting roller is fixedly arranged on the periphery of the hoisting shaft, a hoisting thorn block is fixedly arranged on the periphery of the hoisting roller, a hoisting chain is fixedly arranged on the periphery of the hoisting roller, the downward extending part of the other end of the hoisting chain extends out of the outside, the tail end of the hoisting chain is fixedly provided with a hoisting hook, and the hoisting chain can be connected with the hoisting thorn block in; the machine body and the outside of the machine body are provided with a braking mechanism which can be used for controlling the rotation of the hoisting roller and enabling the hoisting hook to achieve a hoisting effect, the braking mechanism comprises a fixed box fixedly arranged on the right side surface of the machine body, a power cavity with a downward opening is arranged in the fixed box, the left side and the right side of the power cavity are both communicated with a lifting cavity, the inner wall of the lifting cavity is provided with a lifting block in a sliding manner, a power shaft is rotatably arranged between the two lifting blocks, a lifting roller is fixedly arranged on the periphery of the power shaft, a lifting thorn block is fixedly arranged on the periphery of the lifting roller, a lifting chain is wound on the periphery of the lifting roller and is connected with the lifting thorn block in a buckling manner, a transverse shaft is rotatably arranged in the inner wall of the machine body, a connecting cavity with a right opening is arranged in the machine body and is communicated with the lifting cavity, and the left extending part of the power shaft extends, the right extending part of the cross shaft extends into the connecting cavity, connecting belt wheels are fixedly arranged on the peripheries of the cross shaft and the power shaft in the connecting cavity, connecting belts are wound on the peripheries of the two connecting belt wheels, and the connecting belts can be in transmission connection with the two connecting belt wheels; the crane comprises a machine body, wherein a power mechanism capable of controlling the hoisting roller to prevent the hoisting roller from falling down when in hoisting is arranged in the machine body, the power mechanism comprises two limiting cavities which are arranged in the machine body in a bilateral symmetry manner, the extending part of a hoisting shaft extends into the limiting cavities, the side surface of the hoisting roller far away from the hoisting roller is fixedly provided with a ratchet ring, the side surface of the hoisting shaft far away from the hoisting roller is fixedly provided with a ratchet ring, the inner ring of the ratchet ring is smooth, the outer ring surface of the ratchet ring is fixedly provided with teeth, two pressing blocks which are symmetrical front and back are arranged in the inner ring of the ratchet ring and can be abutted against the inner ring wall of the ratchet ring, the back wall of the limiting cavity is provided with an elastic column in a sliding manner, a rack is fixedly embedded in the inner wall of the front side of the elastic column, a cross shaft penetrates through the limiting cavities, a sector gear is fixedly arranged on the, the periphery of the rotating disc is fixedly provided with a screw die and a fixed block, a hinge block is hinged between the fixed block and the elastic column, and the screw die can be abutted to the screw die.

2. The crane capable of stably disassembling and assembling the precision mold according to claim 1, wherein: a lifting spring is fixedly installed between the bottom surface of the lifting block and the bottom wall of the lifting cavity, a transmission cavity is formed in the machine body, a left extending part of the transverse shaft extends into the transmission cavity, a spline sleeve is arranged on the left wall of the transmission cavity in a rotating mode, transmission belt wheels are fixedly arranged on the peripheries of the spline sleeve and the transverse shaft, a transmission belt is arranged between the two transmission belt wheels in a transmission connection mode, a spline shaft is arranged on the inner spline connection of the spline sleeve in a spline connection mode, the spline shaft is rotatably connected with the right wall of the transmission cavity, a screw rod is fixedly arranged on the right side face of the spline shaft, a sliding block is arranged on the bottom wall of the machine body in a sliding mode, a threaded cavity with a left opening is formed in the sliding block, a right extending part of the screw rod extends out of the outside and extends into the threaded cavity, the screw rod is, the hoisting chain can be abutted against the inner wall of the abutting cavity.

3. The crane capable of stably disassembling and assembling the precision mold according to claim 2, wherein: two restriction chamber with two bilateral symmetry's gear chamber has been seted up between the jack-up chamber, the cross axle runs through the gear chamber is located the gear intracavity the cross axle periphery has set firmly drive gear, it is equipped with reversing gear to rotate between the wall about the gear chamber, the jack-up axle runs through the gear chamber, and has set firmly driven gear in its periphery, driven gear with reversing gear meshing, drive gear with reversing gear meshing.

4. The crane capable of stably assembling and disassembling the precision mold according to claim 3, wherein: the top surface of elasticity post with fixed mounting has reset spring between the roof in restriction chamber, the right flank of rotary disk with fixed mounting has reset torsion spring between the right wall in restriction chamber, set firmly the brace table on the back wall in restriction chamber, the fixed block with brace table butt.

5. The crane capable of stably disassembling and assembling the precision mold according to claim 4, wherein: a sliding cavity is formed in the machine body and is communicated with the lifting cavity, a cross post is arranged on the inner wall of the sliding cavity in a sliding mode, a pulling connecting rod is hinged between the cross post and the lifting block, a control cavity is formed in the limiting cavity and is communicated with the side far away from the lifting cavity, a moving block is arranged on the bottom wall of the control cavity in a sliding mode, the sliding cavity is communicated with the control cavity, an upright post is fixedly arranged on the top surface of the moving block, the extending portion of the upright post is fixedly connected with the cross post, a rhombic cavity with an opening facing the limiting cavity is formed in the moving block, two sliding rods which are symmetrical in the front and back are arranged on the inner wall of the lifting cavity in a sliding mode, the extending portions of the sliding rods facing the limiting cavity are arranged in a crossed mode and are hinged with each other, a pressing rod is fixedly arranged on the side face, close to the limiting cavity, and a jacking spring is fixedly arranged between the front compression bar and the rear compression bar.

Technical Field

The invention relates to the related technical field of cranes, in particular to a crane capable of stably disassembling and assembling a precision mold.

Background

The production mode of producing products through injection of precise moulds has become the production mode of most complex products, but, because mould weight is overweight, it is very inconvenient to dismantle the installation on the injection molding machine, general hoist is at the in-process of mould wherein, very unstable, the mould rocks easily in the air, have the risk of dropping, and because the mould is overweight, general small-size hoisting structure produces the trouble easily, the indirect increase mould risk of dropping, large-scale hoist cost is too high again, consequently, it is necessary to design a hoist that can stabilize the hoist precision mould, solve above-mentioned problem.

Disclosure of Invention

The invention aims to provide a crane capable of stably disassembling and assembling a precision mold, which is used for overcoming the defects in the prior art.

According to the embodiment of the invention, the crane capable of stably dismounting and mounting the precision mold comprises a machine body, two bilaterally symmetrical support columns are fixedly arranged on the bottom surface of the machine body, two moving wheels which are bilaterally symmetrical are rotatably arranged on the bottom surfaces of the support columns, a lifting cavity with a downward opening is arranged in the machine body, a lifting shaft is rotatably arranged between the left wall and the right wall of the lifting cavity, a lifting roller is fixedly arranged on the outer periphery of the lifting shaft, a lifting spur block is fixedly arranged on the outer periphery of the lifting roller, a lifting chain is fixedly arranged on the outer periphery of the lifting roller, the downward extending part of the other end of the lifting chain extends out of the outside, a lifting hook is fixedly arranged at the tail end of the lifting chain, the lifting chain can be connected with the lifting spur block in a buckling manner, and braking mechanisms which can be used for controlling the rotation of the lifting roller and enabling the lifting, the brake mechanism comprises a fixed box fixedly arranged on the right side surface of the machine body, a power cavity with a downward opening is arranged in the fixed box, the left side and the right side of the power cavity are communicated with each other and provided with a lifting cavity, the inner wall of the lifting cavity is provided with a lifting block in a sliding manner, a power shaft is rotatably arranged between the two lifting blocks, a lifting roller is fixedly arranged on the periphery of the power shaft, a lifting thorn block is fixedly arranged on the periphery of the lifting roller, a lifting chain is wound on the periphery of the lifting roller and connected with the lifting thorn block in a buckling manner, a transverse shaft is rotatably arranged in the inner wall of the machine body, a connecting cavity with a right opening is arranged in the machine body and communicated with the lifting cavity, a leftward extending part of the power shaft extends into the connecting cavity, a rightward extending part of the transverse shaft extends into the connecting cavity, and a connecting belt wheel is fixedly arranged on the peripheries of the transverse shaft and the power shaft in, the periphery of the two connecting belt wheels is wound with a connecting belt, the connecting belt can be in transmission connection with the two connecting belt wheels, a power mechanism capable of controlling the lifting roller to prevent the lifting roller from falling down when lifting is arranged in the machine body, the power mechanism comprises two limiting cavities which are arranged in the machine body in a bilateral symmetry mode, the extending part of the lifting shaft extends into the limiting cavities, the extending part of the lifting shaft is far away from the side face of the lifting roller and is fixedly arranged, a ratchet ring is fixedly arranged on the side face of the lifting shaft and is smooth in inner ring, teeth are fixedly arranged on the outer ring face of the ratchet ring, two pressing blocks which are symmetrical front and back are arranged in the inner ring of the ratchet ring and can be abutted against the inner ring wall of the ratchet ring, an elastic column is arranged on the rear wall of the limiting cavity in a sliding mode, a rack is fixedly arranged in the inner wall of the front, be located in the restriction intracavity the cross axle periphery has set firmly sector gear, sector gear can with rack toothing, it is equipped with the rotary disk to rotate between the wall about the restriction chamber, screw die and fixed block have set firmly on the periphery of rotary disk, the fixed block with it articulates to be equipped with articulated piece between the elastic column, the screw die can with the tooth butt.

A lifting spring is fixedly installed between the bottom surface of the lifting block and the bottom wall of the lifting cavity, a transmission cavity is formed in the machine body, a left extending part of the transverse shaft extends into the transmission cavity, a spline sleeve is arranged on the left wall of the transmission cavity in a rotating mode, transmission belt wheels are fixedly arranged on the peripheries of the spline sleeve and the transverse shaft, a transmission belt is arranged between the two transmission belt wheels in a transmission mode, a spline shaft is arranged in the inner spline connection of the spline sleeve and is in rotating connection with the right wall of the transmission cavity, a screw rod is fixedly arranged on the right side face of the spline shaft, a sliding block is arranged on the bottom wall of the machine body in a sliding mode, a threaded cavity with a left opening is formed in the sliding block, a right extending part of the screw rod extends out of the outside and extends into the threaded cavity, the screw rod is in threaded connection with the inner wall of the threaded cavity, and a, the hoisting chain can be abutted against the inner wall of the abutting cavity.

A further technical scheme, two restriction chamber with set up two bilateral symmetry's gear chamber between the jack-up chamber, the cross axle runs through the gear chamber is located the gear intracavity the cross axle periphery has set firmly drive gear, it is equipped with the reversing gear to rotate between the left and right sides wall in gear chamber, the jack-up axle runs through the gear chamber, and has set firmly driven gear in its periphery, driven gear with the meshing of reversing gear, drive gear with the meshing of reversing gear.

According to the technical scheme, a reset spring is fixedly mounted between the top surface of the elastic column and the top wall of the limiting cavity, a reset torsion spring is fixedly mounted between the right side face of the rotating disc and the right wall of the limiting cavity, a supporting table is fixedly arranged on the rear wall of the limiting cavity, and the fixing block is abutted to the supporting table.

According to a further technical scheme, a sliding cavity is formed in the machine body and is communicated with the lifting cavity, a cross column is arranged on the inner wall of the sliding cavity in a sliding mode, a pulling connecting rod is hinged between the cross column and the lifting block, a control cavity is communicated with the side, away from the lifting cavity, of the limiting cavity, a moving block is arranged on the bottom wall of the control cavity in a sliding mode, the sliding cavity is communicated with the control cavity, an upright column is fixedly arranged on the top surface of the moving block, an extending portion of the upright column is fixedly connected with the cross column, a diamond-shaped cavity with an opening facing the limiting cavity is formed in the moving block, two sliding rods which are symmetrical in the front and back are arranged on the inner wall of the lifting cavity in a sliding mode, extending portions of the sliding rods facing the limiting cavity are arranged in a crossed mode and are hinged with each other, a pressing rod is fixedly arranged on the side, and is fixedly connected with the pressing block, and a top pressure spring is fixedly arranged between the front pressing rod and the rear pressing rod.

The invention has the beneficial effects that: the invention adopts a buckling connection mode of the chain and the thorn block, can prevent the problem that the hoisting of a lifting rope is slipped due to the smooth surface of the roller in the hoisting process of the chain, and simultaneously adopts two modes of ratchet wheel limitation and clamping brake emergency braking, so that the problems of crane failure and mold falling due to overweight of the mold in the hoisting process can be greatly improved, the hoisting safety effect is greatly improved, in addition, the bidirectional braking effect is adopted, the hoisting is more stable, and the hoisting chain can be smoothly connected with the hoisting thorn block by adopting the left-right sliding of the sliding block.

Drawings

FIG. 1 is a schematic view of the overall internal structure of the present invention;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1 in accordance with the present invention;

FIG. 3 is an enlarged schematic view of the invention at B of FIG. 1;

FIG. 4 is a cross-sectional view taken along line C-C of FIG. 3 in accordance with the present invention;

fig. 5 is a schematic view of the engagement between the cross post 21 and the lifting block 37 according to the present invention.

Detailed Description

The invention will now be described in detail with reference to fig. 1-5, for convenience of description, the following orientations will now be defined: the up, down, left, right, and front-back directions described below correspond to the up, down, left, right, and front-back directions in the projection relationship of fig. 1 itself.

Referring to fig. 1-5, a crane capable of stably disassembling and assembling a precision mold according to an embodiment of the present invention includes a machine body 13, two support columns 11 that are symmetrical left and right are fixed on a bottom surface of the machine body 13, two movable wheels 12 that are symmetrical front and back are rotatably arranged on the bottom surface of the support columns 11, a lifting cavity 27 with a downward opening is arranged in the machine body 13, a lifting shaft 30 is rotatably arranged between left and right walls of the lifting cavity 27, a lifting roller 29 is fixedly arranged on an outer circumference of the lifting shaft 30, a lifting spur block 28 is fixedly arranged on an outer circumference of the lifting roller 29, a lifting chain 47 is fixedly arranged on an outer circumference of the lifting roller 29, a downward extending portion of the other end of the lifting chain 47 extends out of the outside, a lifting hook 48 is fixedly arranged at a tail end of the lifting chain 48, the lifting chain 47 can be connected with the lifting spur block 28 in a snap-fit manner, a control device capable of controlling rotation of, the braking mechanism 101 enables the lifting hook 48 to achieve a lifting effect, the braking mechanism 101 includes a fixed box 34 fixedly arranged on the right side surface of the machine body 13, a power chamber 35 with a downward opening is arranged in the fixed box 34, the left side and the right side of the power chamber 35 are both communicated with a lifting chamber 39, a lifting block 37 is slidably arranged on the inner wall of the lifting chamber 39, a power shaft 36 is rotatably arranged between the two lifting blocks 37, a lifting roller 42 is fixedly arranged on the periphery of the power shaft 36, a lifting spur 40 is fixedly arranged on the periphery of the lifting roller 42, a lifting chain 41 is wound on the periphery of the lifting roller 42, the lifting chain 41 is connected with the lifting spur 40 in a buckling manner, a cross shaft 26 is rotatably arranged in the inner wall of the machine body 13, a connecting chamber 33 with a rightward opening is arranged in the machine body 13, the connecting chamber 33 is communicated with the lifting chamber 39, and a leftward extending part of the power shaft 36 extends into the connecting chamber 33, the right extending part of the cross shaft 26 extends into the connecting cavity 33, the outer peripheries of the cross shaft 26 and the power shaft 36 in the connecting cavity 33 are fixedly provided with connecting belt wheels 31, the outer peripheries of the connecting belt wheels 31 are wound with connecting belts 32, the connecting belts 32 can be in transmission connection with the connecting belt wheels 31, the machine body 13 is internally provided with a power mechanism 102 capable of controlling the lifting roller 29 to prevent the lifting roller 29 from falling when lifting, the power mechanism 102 comprises two limiting cavities 23 which are symmetrically arranged in the machine body 13, the extending part of the lifting shaft 30 extends into the limiting cavity 23, the side surface far away from the lifting roller 29 is fixedly provided with a 68, the 68 side surface far away from the lifting shaft 30 is fixedly provided with a ratchet ring 65, the inner ring of the ratchet ring 65 is smooth, the outer ring surface of the ratchet ring 65 is fixedly provided with teeth 64, and the inner ring of the ratchet ring 65 is internally provided with two pressing blocks 66 which are symmetrically arranged, briquetting 66 can with the wall butt in ratchet ring 65, the back wall of restriction chamber 23 slides and is equipped with elastic column 55, the solid rack 54 that has inlayed in elastic column 55's the front side inner wall, cross axle 26 runs through restriction chamber 23 is located in the restriction chamber 23 sector gear 22 has been set firmly in the cross axle 26 periphery, sector gear 22 can with rack 54 meshes, it is equipped with rotary disk 60 to rotate between the wall about restriction chamber 23, screw die 63 and fixed block 59 have been set firmly in the periphery of rotary disk 60, fixed block 59 with articulated block 57 that is equipped with between the elastic column 55, screw die 63 can with tooth 64 butt.

In addition, in one embodiment, a lifting spring 38 is fixedly installed between the bottom surface of the lifting block 37 and the bottom wall of the lifting cavity 39, a transmission cavity 16 is formed in the machine body 13, the leftward extending portion of the transverse shaft 26 extends into the transmission cavity 16, a spline housing 14 is rotatably installed on the left wall of the transmission cavity 16, transmission pulleys 20 are fixedly installed on the peripheries of the spline housing 14 and the transverse shaft 26, a transmission belt 15 is installed between the two transmission pulleys 20 in a transmission connection manner, a spline shaft 52 is installed in an internal spline connection of the spline housing 14, the spline shaft 52 is rotatably connected with the right wall of the transmission cavity 16, a screw 51 is fixedly installed on the right side surface of the spline shaft 52, a sliding block 49 is slidably installed on the bottom wall of the machine body 13, a threaded cavity 50 with a leftward opening is formed in the sliding block 49, the rightward extending portion of the screw 51 extends out of the outside and into the threaded cavity 50, the screw 51 is in threaded connection with the inner wall of the threaded cavity 50, the sliding block 49 is internally provided with a right-opening abutting cavity 46, the lifting chain 47 can abut against the inner wall of the abutting cavity 46, when the lifting chain 41 is manually pulled, the lifting roller 42 can drive the power shaft 36 and the lifting block 37 to move downwards, the connecting belt wheel 31 and the connecting belt 32 can be in a tight state, at the moment, the lifting roller 42 is manually rotated to rotate forwards, the power shaft 36 can drive the transverse shaft 26 to rotate forwards, the lifting roller 42 is controlled to rotate forwards, the spline sleeve 14 can drive the spline shaft 52 and the screw 51 to rotate forwards through the transmission belt 15, the sliding block 49 can move rightwards, and when the transverse shaft 26 rotates backwards, the sliding block 49 moves leftwards.

In addition, in one embodiment, two bilaterally symmetrical gear cavities 24 are formed between the two limiting cavities 23 and the lifting cavity 27, the transverse shaft 26 penetrates through the gear cavity 24, a transmission gear 25 is fixedly arranged on the periphery of the transverse shaft 26 positioned in the gear cavity 24, a reverse gear 45 is rotatably arranged between the left wall and the right wall of the gear cavity 24, the lifting shaft 30 penetrates through the gear cavity 24, a driven gear 44 is fixedly arranged on the periphery of the lifting shaft 30, the driven gear 44 is meshed with the reverse gear 45, the transmission gear 25 is meshed with the reverse gear 45, the lifting shaft 30 can drive the lifting roller 29 to rotate forwards through the forward rotation of the transverse shaft 26, the lifting chain 47 can be rotated and tightened, the lifting hook 48 can achieve a lifting effect, and at the time, the sliding block 49 moves rightwards, the lifting chain 47 can be normally connected with the lifting block 28, when the transverse shaft 26 is reversed, the lifting hook 48 can be lowered.

In addition, in one embodiment, a return spring 53 is fixedly installed between the top surface of the elastic column 55 and the top wall of the limiting cavity 23, a return torsion spring 62 is fixedly installed between the right side surface of the rotating disc 60 and the right wall of the limiting cavity 23, a support platform 58 is fixedly installed on the rear wall of the limiting cavity 23, the fixed block 59 abuts against the support platform 58, when the transverse shaft 26 rotates forwards, the sector gear 22 rotates forwards, the elastic column 55 is fixed, meanwhile, the lifting shaft 30 can drive the ratchet ring 65 to rotate forwards, when the ratchet ring 65 drives the teeth 64 to rotate forwards, the ratchet ring 65 can rotate normally through the elastic action of the return torsion spring 62, and the dies 63 reset when rotating by one tooth 64, so as to prevent the ratchet ring 65 from rotating backwards, the lifting hook 48 can be prevented from falling during lifting, when the transverse shaft 26 rotates reversely, the sector gear 22 can drive the elastic column 55 to ascend, so that the dies 63 can rotate downwards, and then the ratchet ring 65 can rotate normally, so that the lifting hook 48 can descend, the accident that the lifting hook 48 descends rapidly suddenly happens can be prevented by the sector gear 22, and when the sector gear 22 rotates to separate the rack 54, the elastic column 55 can be reset by the reset spring 53, so that the dies 63 can achieve the limiting effect again.

In addition, in one embodiment, a sliding chamber 74 is formed in the machine body 13, the sliding chamber 74 is communicated with the lifting chamber 39, a cross column 21 is slidably formed on an inner wall of the sliding chamber 74, a pulling link 73 is hinged between the cross column 21 and the lifting block 37, a control chamber 18 is communicated with the side of the limiting chamber 23 away from the lifting chamber 27, a moving block 71 is slidably formed on a bottom wall of the control chamber 18, the sliding chamber 74 is communicated with the control chamber 18, a vertical column 19 is fixedly arranged on a top surface of the moving block 71, an extending portion of the vertical column 19 is fixedly connected with the cross column 21, a rhombic chamber 72 with an opening facing the limiting chamber 23 is formed in the moving block 71, two sliding rods 69 which are symmetrical in the front and back are slidably formed on the inner wall of the lifting chamber 27, the sliding rods 69 are crosswise arranged to the extending portion facing the limiting chamber 23 and hinged to each other, a pressing rod 67 is fixedly arranged on a side of the sliding rod 69, the extension part of the pressure lever 67 extends into the inner ring of the ratchet ring 65 and is fixedly connected with the pressure block 66, a top pressure spring 70 is fixedly arranged between the front pressure lever 67 and the rear pressure lever 67, when the lifting block 37 is pulled downwards for use, the cross column 21 can be moved rightwards, the cross column 21 can drive the upright column 19 to move, the two moving blocks 71 can be moved rightwards, the slide rod 69 can drive the pressure lever 67 to rotate towards the near side, the pressure block 66 can be separated from the inner ring wall of the ratchet ring 65, the ratchet ring 65 can be rotated forwards, when an emergency occurs, the lifting chain 41 is loosened, the pressure block 66 can be reset and abutted to clamp the ratchet ring 65, and therefore an emergency braking effect is achieved.

In the initial state, the lifting block 37 is in the lifting state, the pressing block 66 clamps the inner ring wall of the ratchet ring 65, the threading die 63 limits the reverse rotation of the teeth 64, and the elastic column 55 is positioned at the inner lower side of the limiting cavity 23.

When the lifting chain 41 is manually pulled, the lifting roller 42 can drive the power shaft 36 and the lifting block 37 to move downwards, the connecting belt wheel 31 and the connecting belt 32 can be processed in a tight state, the lifting roller 42 is manually rotated to rotate forwards, the power shaft 36 can drive the transverse shaft 26 to rotate forwards, the lifting roller 42 is controlled to rotate forwards, the spline sleeve 14 can drive the spline shaft 52 and the screw rod 51 to rotate forwards through the transmission belt 15, the sliding block 49 can move rightwards, the sliding block 49 moves leftwards when the transverse shaft 26 rotates reversely, the lifting roller 29 can be driven to rotate forwards through the lifting shaft 30 through the forward rotation of the transverse shaft 26, the lifting chain 47 can be rotationally tightened, the sliding block 48 can achieve a lifting effect, the sliding block 49 moves rightwards at the moment, the lifting chain 47 can be normally buckled with the lifting block 28, and the lifting hook 48 can be driven to rotate backwards when the transverse shaft 26, when the transverse shaft 26 rotates forwards, the sector gear 22 rotates forwards, the elastic column 55 does not move, meanwhile, the lifting shaft 30 can drive the ratchet ring 65 to rotate forwards, when the ratchet ring 65 drives the teeth 64 to rotate forwards, the ratchet ring 65 can rotate normally under the elastic action of the reset torsion spring 62, the dies 63 reset when rotating over one tooth 64, the ratchet ring 65 can be prevented from rotating backwards, the lifting hook 48 can be prevented from falling off in the lifting process, when the transverse shaft 26 rotates backwards, the sector gear 22 can drive the elastic column 55 to lift, the dies 63 can rotate downwards, the ratchet ring 65 can rotate normally, the lifting hook 48 can be lowered, the accident that the lifting hook 48 suddenly descends rapidly can be prevented through the sector gear 22, when the sector gear 22 rotates to separate the rack 54, the elastic column 55 can be reset through the reset spring 53, the dies 63 can achieve the limiting effect again, when the lifting block 37 is pulled downwards for use, the cross column 21 can be moved rightwards, at the moment, the cross column 21 can drive the upright column 19 to move, the two moving blocks 71 can be moved rightwards, so that the sliding rod 69 can drive the pressing rod 67 to rotate towards the close sides, the pressing block 66 can be separated from the inner ring wall of the ratchet ring 65, the ratchet ring 65 can rotate forwards, when an emergency occurs, the lifting chain 41 is loosened, the pressing block 66 can be reset to abut against and clamp the ratchet ring 65, and therefore the emergency braking effect is achieved.

The invention has the beneficial effects that: the invention adopts a buckling connection mode of the chain and the thorn block, can prevent the problem that the hoisting of a lifting rope is slipped due to the smooth surface of the roller in the hoisting process of the chain, and simultaneously adopts two modes of ratchet wheel limitation and clamping brake emergency braking, so that the problems of crane failure and mold falling due to overweight of the mold in the hoisting process can be greatly improved, the hoisting safety effect is greatly improved, in addition, the bidirectional braking effect is adopted, the hoisting is more stable, and the hoisting chain can be smoothly connected with the hoisting thorn block by adopting the left-right sliding of the sliding block.

It will be apparent to those skilled in the art that various modifications may be made to the above embodiments without departing from the general spirit and concept of the invention. All falling within the scope of protection of the present invention. The protection scheme of the invention is subject to the appended claims.