CN204938806U - Preventing lifting hook from falling device - Google Patents

Abstract

An anti-falling device for a hook, used to prevent the hook assembly of an overhead crane from falling from below the luffing trolley when the hook of the tower crane rushes to the top, including two anti-falling devices hinged at the lower bottom of the luffing trolley The two anti-fall hooks are arranged at intervals and located between the two first fixed guide wheels of the luffing trolley. The lower hook heads of the two anti-fall hooks can swing in opposite directions. The suspension hooks The anti-fall device also includes two hangers that are fixed on the upper end of the hook assembly and can be engaged with the anti-fall hook when the hook rushes to the top. The positions of the two lower hook heads are corresponding when the swing resets. The above-mentioned anti-falling device for the hook has a simple structure and materials, and can be directly manufactured on site, which increases the safety performance of the crane and avoids the occurrence of safety accidents when the hook is pushed to the top.

Description

Hook fall arrest device

technical field

The utility model relates to a hook anti-falling device for a tower crane.

Background technique

In order to prevent the hook from rushing to the top, the crane is equipped with a height limiter on the side of the hoisting mechanism drum when leaving the factory. The function of the height limiter is: according to the requirements of the specification, when the hook rises to about 800mm from the lifting wall, the power will be cut off. , even if the operating handle is still pushed to the rising position, the hook can no longer rise, but the handle can only be pushed to the falling position, and the hook can go down. Heavy objects fall, causing safety accidents. But when the height limiter fails, this kind of accident still cannot be avoided.

However, if there is an operation error in the lifting equipment, the height limiter fails, and the wire rope for the hook to the top is pulled off from time to time, the hook or the lifting goods will fall from the height together, which may cause a major safety accident. Accidents can result in major economic losses. However, under normal circumstances, the hooks are empty hooks or the lifted goods are light and small in size, which is easy to happen in the case of rapid ascent. Therefore, it is urgent to design a structure that can prevent the suspension hook from falling down when the suspension hook rushes to the top.

Utility model content

Aiming at the deficiencies of the above-mentioned prior art, the technical problem to be solved by the utility model is: how to provide an anti-falling device for a hook of a tower crane that can prevent the hook from falling downward when the hook is pushed to the top.

In order to solve the above technical problems, the technical solution adopted by the utility model is to provide a hook anti-falling device, which is used to prevent the hook assembly of the crane from falling from the bottom of the luffing trolley when the hook of the tower crane rushes to the top. Falling, including two anti-fall hooks hinged on the lower bottom of the luffing trolley. The lower hook head part of the hook can swing in the opposite direction, and the hook fall prevention device also includes two pendants that are fixed on the upper end of the hook assembly and can be engaged with the fall prevention hook when the hook hits the top. The setting positions of the two hangers correspond to the positions of the two lower hook heads when the two anti-fall hooks are reset by swinging.

As an optimization, it also includes a fixing structure for installing two anti-fall hooks on the lower bottom of the luffing trolley, the fixing structure includes an installation vertical plate, and the installation vertical plate is vertically formed by the lower bottom surface of the luffing trolley. Extending downwards, the left and right ends of the installation stand are respectively close to the two first fixed guide wheels; a shaft pin is respectively arranged on the left and right sides of the installation stand, and the two anti-fall hooks pass through the shaft respectively. The pins are installed on the backside of the mounting riser.

As an optimization, the installation vertical boards are two pieces, they are arranged in parallel front and rear, two pivot pins are arranged between the two installation vertical boards, and the two anti-fall hooks are installed on the two installation vertical boards through the two pivot pins between, and can respectively rotate around the corresponding pivot pins.

As an optimization, it also includes a compression spring plate positioned between the two anti-fall hooks and two return compression springs, the compression spring plate has two compression spring mounting surfaces facing the two anti-fall hooks respectively, and the two return compression springs One end of each is respectively fixed on two stage clip mounting surfaces, and the other end of two return stage clips is respectively connected with the upper hook bar of two anti-drop hooks.

As an optimization, it also includes a collision seat with a vertical cavity, the upper end surface of the collision seat is fixed on the lower bottom surface between the two first fixed guide wheels; the collision seat has a T-shaped block-shaped front wall and the rear wall, the left wall and the right wall are respectively connected on both sides of the lower part of the front wall and the rear wall, and the lower surface of the upper half of the collision seat is lower than the horizontal plane where the lowest point of the first fixed guide wheel is located The upper hook rods of the two anti-fall hooks are installed in the vertical cavity, and the upper hook rods of the two anti-fall hooks are respectively close to the corresponding left and right walls, and the lower hook heads of the two anti-fall hooks are from the The lower end of the collision seat passes through, and the vertical planes where the outer sides of the lower hook heads of the two anti-fall hooks are respectively located outside the vertical planes where the left and right sides of the lower end of the lower collision seat are located; The two return pressure springs are arranged in the internal cavity of the collision seat.

As an optimization, it also includes two guide plates for guiding the hook assembly. The upper ends of the two guide plates are respectively fixed to the lower end surfaces of the front wall and the rear wall, and the lower ends are respectively downward and inclined in opposite directions.

As an optimization, the highest points of the lower hook heads of the two anti-fall hooks are located at a level lower than the lower end surface of the collision steel.

As an optimization, it also includes two limit shafts horizontally arranged in the collision seat and used to limit the two anti-fall hooks. The left and right ends of the two limit shafts are connected with the left wall and the right The walls are vertically connected, and the two limiting shafts are spaced apart from each other to form a limiting space, and the two anti-fall hooks are respectively installed on the left and right sides of the limiting space.

As an optimization, it also includes a guide shaft, the upper end of the guide shaft is affixed to the two limit shaft rods, the lower end extends vertically downward, and the lower end of the guide shaft has a downward taper; A guide seat is provided at a position corresponding to the guide shaft on the upper end surface of the assembly, and a taper hole matching the taper of the lower end of the guide shaft vertically penetrates through the guide seat.

As an optimization, the hook assembly includes two splints that are vertical and spaced apart from each other, and second fixed guide wheels corresponding to the first fixed guide wheels are respectively arranged on the left and right sides of the two splints; The hanger is a portal frame, and the two portal frames are respectively arranged on the upper end of the hook assembly at positions corresponding to the two lower hook heads. The two facades of the portal frame are respectively detachable from the two splints Connected, the distance between the two gantry frames is less than the distance between the outer surfaces of the lower hook heads before the two anti-fall hooks are compressed.

The above-mentioned anti-falling device for the hook can prevent the hook assembly from falling from the bottom of the luffing trolley through the engagement between the two anti-falling hooks and the pendants of the two-door structure when the hook is rushing to the top, which increases the safety of the crane. The safety performance avoids the occurrence of safety accidents when the hook is pushed to the top. The anti-falling device for the hook of the utility model has simple structure and simple materials, and can be directly manufactured on site.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic diagram of a partial structure located at the bottom of a luffing trolley in an embodiment of the anti-falling device for a hook of a tower crane of the present invention.

FIG. 2 is a side view of FIG. 1 .

Fig. 3 is a schematic diagram of a part of the structure located on the hook assembly in an embodiment of the anti-falling device for the hook of the tower crane of the present invention.

FIG. 4 is a side view of FIG. 3 .

Fig. 5, Fig. 6 and Fig. 7 are the use state diagrams of the utility model tower crane hook fall prevention device.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Please refer to Fig. 1 to Fig. 7, the hook falling prevention device of the present utility model is used to prevent the hook assembly 2 of the overhead crane from falling from the bottom of the luffing trolley 1 when the hook of the tower crane rushes to the top, including the hinge Two anti-fall hooks 31 on the lower bottom of the luffing trolley 1, the two anti-fall hooks 31 are arranged at intervals and are located between the two first fixed guide wheels 11 of the luffing trolley 1, the two anti-fall hooks The lower hook head 311 of the hook 31 can swing in the opposite direction, and the anti-falling device for the hook also includes a hook that is fixed on the upper end of the hook assembly 2 and can be engaged with the anti-falling hook 31 when the hook is pushed to the top. Two hanging pieces 32 , the setting positions of the two hanging pieces 32 correspond to the positions of the two lower hook heads 311 when the two anti-fall hooks 31 are reset by swinging.

The anti-fall hook 31 includes an upper hook bar 312 and a lower hook head 311 located at the lower end of the upper hook bar 312 , and the anti-fall hook 31 is hinged to the lower bottom of the luffing trolley 1 through the upper hook bar 312 .

The luffing trolley 1 of the present embodiment comprises a vehicle frame 12, two first fixed guide wheels 11 spaced apart from each other at the bottom of the vehicle frame 12 along the length direction of the vehicle frame 12, and a pulley 13 (four ), the luffing trolley 1 can move back and forth on the cross arm 8 of the tower crane through four pulleys 13. in:

The vehicle frame 12 includes a closed and horizontal bottom frame (lower bottom) formed by combining four first transverse axes. The bottom frame has two sides 121 in the length direction and two sides 122 in the width direction. Two second horizontal shafts 123 are arranged on the back horizontally in the bottom frame, and the two ends of the two second horizontal shafts 123 are respectively welded with the two widthwise sides 122 of the bottom frame (with the side 121 of the lengthwise direction of the bottom frame) parallel to each other), the two second transverse shafts 123 are spaced apart and parallel to each other, and a pair of shaft holes for shaft pins are respectively provided at both ends of the two second transverse shafts 123, and the two first fixed guide wheels 11 respectively pass through After passing through the two shaft pins, the two shaft pins with the first fixed guide wheels 11 are respectively pierced in two pairs of shaft holes, so that the two first fixed guide wheels 11 are positioned on the two second transverse shafts 123 in the gap between. The two first fixed guide wheels 11 can rotate around the axes of the two pivot pins respectively. At this time, the pivot pins are perpendicular to the two second transverse axes 123, so that the two first fixed guide wheels 11 The axis line is perpendicular to the second transverse axis 123 . The vehicle frame 12 also includes four pulley support rods, which are respectively fixed on the four corners of the bottom frame, and a reinforcing rod 15 is connected between every two adjacent pulley support rods 14 . Four pulleys 13 are arranged on the upper ends of four pulley support rods 14 respectively.

The hook assembly 2 is located directly below the luffing trolley 1, and the hook assembly 2 includes two vertical splints 21 parallel to each other, and the two splints 21 are fixed by four fixing pins. Two second fixed guide wheels 22 corresponding to the first fixed guide wheels 11 are respectively provided on both sides of the two clamps 21 , and a hook body 23 is provided at the lower end of the two clamps 21 . The two second fixed guide wheels 22 are fixed in the two splints 21 by two pivot pins, and the radial surfaces of the two second fixed guide wheels 22 are parallel to the two splints 21 . The hook assembly 2 and the luffing trolley 1 are connected through a steel rope, that is, the steel rope 4 is wrapped around the outer wheel surfaces of the four fixed guide wheels. When the suspension hook assembly 2 needs to be lowered, the steel rope 4 is loosened.

It can be understood that, in other embodiments, the structures of the luffing trolley 1 and the hook assembly 2 are not limited to the above structures, for example, the lower bottom of the luffing trolley 1 can be a whole steel plate, and two first When fixing the guide wheels 11, only two strip-shaped installation holes need to be spaced apart in its length direction, so that the two first fixed guide wheels 11 are arranged in the two strip-shaped installation holes and so on. The hook fall prevention device in this embodiment can use any luffing trolley 1 and hook assembly 2 in the prior art.

The structure of the luffing trolley 1 and the hook assembly 2 described above will be described in detail below as a specific embodiment.

In this embodiment, the hook fall prevention device further includes a fixing structure for installing the two fall prevention hooks 31 on the lower bottom of the luffing trolley 1 . Specifically, the fixed structure includes a base plate 51 and two installation vertical plates 52, the base plate 51 is fixedly connected to the lower bottom surface of the luffing trolley 1, specifically welded on the first and second fixed guide wheels 11 between the two first fixed guide wheels 11. The lower surface of the two transverse shafts 123; the two mounting vertical plates 52 are fixed on the lower surface of the bottom plate 51 parallel to the front and rear. On the left side of the two mounting vertical plates 52, there are respectively corresponding shaft pin holes, and the upper end of one of the anti-fall hooks 31 is pierced on a shaft pin, and then the shaft pin is pierced in two corresponding shaft pin holes, So that the anti-fall hook 31 is arranged between the left sides of the two mounting vertical plates 52 and can rotate around the pivot pin; the right sides of the two mounting vertical plates 52 are also respectively provided with pivot pin holes, and the other anti-fall hook The upper end of 31 is pierced on another shaft pin, and then the shaft pin is pierced in two corresponding shaft pin holes, so that the anti-fall hook 31 is arranged between the right sides of the two mounting vertical plates 52 and can Rotate around this pivot pin.

It can be understood that the front and rear here refer to the length side of the luffing trolley 1 as the front, and the two first fixed guide wheels 11 of the luffing trolley 1 are installed on the left and right sides of the luffing trolley 1, located The side on the front is the front, and the side on the back is the back.

It can be understood that the above structure is not intended to limit the scope of protection of the present utility model. In other embodiments, the fixed structure may only include one installation stand or directly hinge two anti-fall hooks 31 directly on the luffing trolley 1 The bottom surface of the

When the hook rushes to the top, in order to prevent the impact force generated by the rapid upward movement of the hook assembly 2 from easily damaging the two first fixed guide wheels 11, a lower bottom surface between the two first fixed guide wheels 11 is also provided with a In the collision seat 6 of the vertical cavity, two anti-fall hooks 31 pass through the vertical cavity from top to bottom, and the lower ends of the two anti-fall hooks 31 pass through the lower end of the collision seat 6 . When the suspension hook rushes to the top, the suspension hook assembly 2 moves up and down rapidly, and the collision seat 6 can prevent the suspension hook assembly 2 from colliding with the first fixed guide wheel 11, and protect the first fixed guide wheel 11 from being damaged. specifically:

The collision seat 6 has a T-shaped block-shaped front wall and a rear wall, and a left wall and a right wall are respectively connected to both sides of the bottom of the front wall and the rear wall. The lower surface of the upper half of the collision seat 6 is low. The horizontal plane where the lowest point of the first fixed guide wheel 11 is located; the upper parts of the two anti-fall hooks 31 are passed through the vertical cavity, and the upper hook rods 312 of the two anti-fall hooks 31 are respectively close to the corresponding left wall And the right wall, the lower hook heads 311 of the two anti-fall hooks 31 pass through the lower end of the collision seat 6, and the vertical surfaces where the outer sides of the lower hook heads 311 of the two anti-fall hooks 31 are respectively located at the lower ends of the collision Outside the vertical plane where the left and right sides of the lower end of seat 6 are located.

The enclosing of the above-mentioned front, rear, left and right walls makes the upper space of the vertical through cavity larger and the lower space smaller. The lower part of the wall is shortened so that the front and rear walls form an overlapping T-shape. In this example, for the convenience of obtaining materials, the above-mentioned front wall, rear wall, left wall and right wall are all channel steel. The purpose of shortening the bottom of the collision seat 6 is that the inner walls of the left and right walls can limit the two anti-fall lower hook heads 311 respectively, so that the two anti-fall hooks 31 will not swing in opposite directions. When the hook rushed to the top, it was guaranteed that the two hangers 32 of the two anti-falling hooks 31 and the suspension hook assembly 2 hung together.

The parallel distance from the lower bottom surface of the luffing trolley 1 to the lower surface of the upper half of the collision seat 6 is greater than the parallel distance from the lower bottom surface of the luffing trolley 1 to the horizontal plane where the bottommost point of the first fixed guide wheel 11 is located, and the two anti- The left and right outer sides where the lower hook head 311 of the drop hook 31 is located are all located in the vertical plane where the left and right sides of the upper half are located. The lower surface of the upper half of the 6 can resist the suspension hook assembly 2, so that the suspension hook assembly 2 can not continue to move upwards, preventing the first fixed guide wheel 11 from being hit by the suspension hook assembly 2.

It also includes two guide plates 91 for guiding the hook assembly 2. The upper ends of the two guide plates 91 are respectively fixed to the lower end surfaces of the front wall and the rear wall, and the lower ends are respectively downward and inclined in opposite directions. In this example, the distance between the upper ends of the two guide plates 91 is slightly larger than the distance between the outer surfaces of the two flat plates.

In this embodiment, the hook fall prevention device further includes a compression spring plate 71 located between the two anti-fall hooks 31 and two return compression springs 72. The compression spring plate 71 has two The stage clip installation surface of drop hook 31, one end of two return stage stage springs 72 is respectively fixed on two stage stage stage installation surfaces, and the other end of two return stage stage clips 72 is connected with adjacent upper hook bar 312 respectively. When the tower crane is in a normal state, that is, when the hook is not rushing to the top, the two return compression springs 72 are not compressed by the two anti-fall hooks 31, so the return compression springs 72 are in an uncompressed state. , the hook assembly 2 rises rapidly, and the opposite sides between the two hanging parts 32 at the upper end of the hook assembly 2 press the inclined surfaces of the two lower hook heads 311, so the two anti-fall hooks 31 swing in opposite directions, thereby Tightly press the two return stage clips 72, now the suspension hook assembly 2 continues to move upwards, until its upper end pushes against the lower surface of the upper half of the collision seat 6, at this time the lower hook heads 311 of the two anti-fall hooks 31 are positioned at the two sides. Below the pendant 32, the inclined surfaces of the two lower hook heads 311 are not subject to any extrusion, so the two return stage clips 72 return quickly, so that the lower hook heads 311 of the two anti-fall hooks 31 are positioned directly below the two hanger heads 32, and thereafter , the hook assembly 2 cannot continue to move upward due to resistance, so it falls back downwards, so that the pendant 32 is successfully engaged with the hook.

In this embodiment, the horizontal plane where the highest points of the lower hook heads 311 of the two anti-fall hooks 31 are located is lower than the lower end surface of the collision steel, so designed, when the staff takes out the hook assembly 2, the two anti-fall hooks 31 can be The upper hook rod 312 of the drop hook 31 applies pressure to the opposite direction, so that the two lower hook heads 311 are drawn in the opposite direction, and then the suspension hook assembly 2 is moved upwards to take out the suspension hook assembly 2 .

In this embodiment, the hook anti-falling device further includes two limiting shafts 92 horizontally arranged in the collision seat 6 and used to limit the two anti-falling hooks 31 , the two limiting shafts 92 The left and right ends are vertically connected to the left wall and the right wall of the collision seat 6, and the two limiting shafts 92 are spaced apart from each other to form a limiting space, and the two anti-falling hooks 31 are respectively installed on the left and right sides of the limiting space. sides.

The hook fall prevention device also includes a guide shaft 93, the upper end of the guide shaft 93 is affixed to the two limit shaft rods 92, and the lower end extends vertically downward. The lower end of the guide shaft 93 has a downward taper; a guide seat 94 is provided at a position corresponding to the guide shaft 93 on the upper end surface of the hook assembly 2, and a lower end taper with the guide shaft 93 vertically runs through the guide seat 94. Matching taper hole 95.

In this embodiment, the above-mentioned hanger 32 is a portal frame, and the two portal frames are respectively arranged on the upper end of the hook assembly 2 at positions corresponding to the two lower hook heads 311. The two facades of the portal frame They are respectively detachably connected to the two splints 21 , specifically, the two facades are respectively detachably connected to the inner surfaces of the two splints 21 . The distance between the two gantry frames is smaller than the distance between the outer surfaces of the two anti-fall hooks 31 before they are compressed.

Concrete combination example:

In this example, the first channel plays the role of collision, so the following is the collision channel. The anti-falling device of the tower crane hook in this example is installed under the middle channel steel structure (second horizontal axis) between the two first fixed guide wheels of the luffing trolley of the tower crane and the splint of the tower crane hook assembly It is composed of a collision seat, two anti-drop hooks, two door-shaped structure pendants, and a return pressure spring.

1. The structure of the hook anti-fall device

1. Composition with the luffing trolley; the lower part of the channel steel (second horizontal axis) in the middle of the luffing trolley is welded with the upper end of the collision seat. The collision seat is composed of two pieces with a width of 180mm and a length of 300mm, and the two ends of the length direction The lower part is shortened, and the lower length is 200mm. A 130mm×180mm end steel plate (ie, the above-mentioned left and right walls) is welded on the inner side of the lower end, which is welded into a frame to form a collision seat. On the top of the collision seat, there is a bottom plate with a thickness of 14mm, a length and a width of 180mm×160mm, which is welded to the lower bottom surface of the two channel steels (second horizontal axis) of the first fixed guide wheel of the luffing trolley, and on the top of the bottom plate Four reinforced triangular rib plates are welded with the first transverse axis, and two front and rear parallel installation vertical plates are welded on the bottom surface of the bottom plate. The anti-fall hook is installed between the two installation vertical plates through the hinge shaft, and a 60mm×180mm compression spring seat plate is welded in the middle of the collision seat, and 2 compression springs are installed between the compression spring seat plate and the anti-fall hook . The front and rear sides of the anti-fall hook are two angle steels of 30mm×30mm, and the two ends of the angle steel are welded on the left and right walls of the two ends of the collision seat, which play the guiding role of the two anti-fall hooks. The middle part of the angle steel is welded with a φ35mm guide shaft with a taper at the lower end. When the hook assembly is close to the collision seat, it passes through the guide seat at the upper middle part of the hook assembly for positioning. In addition, two pieces are welded on both sides of the collision seat: a steel plate with a thickness of 10mm, a length and a width of 160mm×100mm, and the steel plate is inclined 40° outward, which also acts as a guide when the hook approaches the collision channel steel (see Figure 1 and figure 2).

2. Composition with the hook assembly of the tower crane; two anti-fall door frames are installed on both sides of the upper end of the hook assembly, and the bottom of the anti-fall door frame is connected to the two sides of the hook assembly with 4 M16 bolts. On the two splints, the bolt connection is convenient for disassembly and assembly during the repair of the hook assembly. The distance between the two anti-drop door frames is 250mm, which is 50mm longer than the lower part of the collision seat, which is convenient for the upper end of the hook assembly to connect with the collision seat. The upper parts come into contact when they collide. There is a φ65mm tapered hole on the guide seat, which is a tapered guide shaft with the lower part of the collision seat, passing through it for positioning. The hole is φ30mm larger than the tapered guide shaft, which is to make the hole wide enough for the guide shaft to pass through, otherwise problems will occur (see Figure 3 and Figure 4).

2. The use process of the tower crane hook anti-fall device

When the tower crane is running upwards quickly during use, if there is an operation error of the tower crane and the height limit device fails, the hook assembly will directly go up and collide with the collision seat under the luffing trolley. At this time, the hook assembly passes through the collision seat Guided by the lower guide plate and the guide shaft, the lower hook head of the anti-fall hook is in contact with the anti-fall door frame, and the two lower hook heads are compressed by using the slope below the anti-fall lower hook head. When the frame is higher than the lower hook head of the anti-fall hook, the two anti-fall hooks will quickly enter the anti-fall door frame above the hook assembly under the action of the return pressure spring, and the hook assembly will If the seat is blocked, the wire rope will be forcibly broken (see Figure 5).

After the wire rope is pulled off, the hook assembly will naturally fall down due to the weight. At this time, the lower hook head of the anti-fall hook has entered the anti-fall door frame, and the hook assembly will be hooked by the lower hook head of the anti-fall hook. , so the hook assembly will not continue to fall down (see Figure 6).

After the collision, because the hook assembly slides down, there will be a distance between the lower plane of the collision seat and the upper plane of the hook assembly, and the distance between them is 120mm. We can take out the hook assembly by using this distance, which is also It is the distance that the hook assembly needs to move upward when the hook assembly is taken out. At this time, the luffing trolley can go back and get close to the root of the lifting wall of the tower crane, which is convenient for the maintenance personnel to operate. By replacing the wire rope and using the method of micro-movement of the hoist, slowly lift the hook assembly. In the upward distance, artificially press the anti-fall hook in the middle, let the hook assembly drop down slowly, take the hook assembly out of the anti-fall hook, and the tower crane resumes normal use. The purpose of the drop device is achieved (see Figure 7).

The function of the hook anti-fall device is that after the main wire rope of the lifting equipment is broken, the hook assembly and the cargo cannot be freely dropped from the air. Under control, it runs up and down in a direction to achieve the purpose of safe production.

The above are only embodiments of the present utility model, and are not intended to limit the patent scope of the present utility model. Any equivalent structure or equivalent process conversion made by using the description of the utility model and the contents of the accompanying drawings, or directly or indirectly used in other related Technical fields are all included in the scope of patent protection of the utility model in the same way.

Claims (10)

1. An anti-falling device for a hook, used to prevent the hook assembly of the overhead crane from falling from below the luffing trolley when the hook of the tower crane rushes to the top, it is characterized in that: it includes a lower part hinged on the luffing trolley The two anti-fall hooks at the bottom, the two anti-fall hooks are arranged at intervals and located between the two first fixed guide wheels of the luffing trolley, the lower hook parts of the two anti-fall hooks can move in opposite directions Swing, the hook fall prevention device also includes two hanging parts fixed on the upper end of the hook assembly and capable of being engaged with the anti-falling hook when the hook rushes to the top. The positions of the two lower hook heads are corresponding when the swing reset of the two anti-fall hooks is described. 2. The anti-falling device for hooks according to claim 1, further comprising a fixing structure for installing two anti-falling hooks on the lower bottom of the luffing trolley, the fixing structure includes a mounting stand The installation vertical plate extends vertically downward from the lower bottom surface of the luffing trolley, and the left and right sides of the installation vertical plate are respectively close to the two first fixed guide wheels; A shaft pin is respectively arranged on the left and right sides of the installation vertical plate, and the two anti-fall hooks are respectively installed on the installation vertical plate with their backs through the shaft pins. 3. The anti-falling device for hooks as claimed in claim 2, characterized in that: the installation vertical plates are two pieces, they are arranged in parallel front and back, two shaft pins are arranged between the two installation vertical plates, and the two installation vertical plates An anti-fall hook is installed between two mounting vertical plates through two pivot pins, and can rotate around corresponding pivot pins respectively. 4. The hook fall prevention device according to claim 1, further comprising a compression spring plate located between the two anti-fall hooks and two return compression springs, the compression spring plate has two directions respectively facing The stage clip installation surfaces of two anti-drop hooks, one end of two return stage clips are respectively fixed on two stage stage stage installation surfaces, and the other end of two return stage stage clips is connected with the upper hook bar of two anti-fall hooks respectively. 5. The hook fall prevention device according to claim 4, characterized in that: it also includes a collision seat with a vertical through cavity, the upper end surface of the collision seat is fixed on the gap between the two first fixed guide wheels. on the bottom surface; The collision seat has a T-shaped block-shaped front wall and a rear wall, and a left wall and a right wall are respectively connected to both sides of the lower part of the front wall and the rear wall, and the lower surface of the upper half of the collision seat is lower than the The horizontal plane where the lowest point of the first fixed guide wheel is located; The upper hook rods of the two anti-fall hooks are passed through the vertical cavity, and the upper hook rods of the two anti-fall hooks are respectively close to the corresponding left and right walls. The lower end of the collision seat passes through, and the vertical planes where the outer sides of the lower hook heads of the two anti-fall hooks are located are respectively outside the vertical planes where the left and right sides of the lower end of the lower collision seat are located; The compression spring plate and the two return compression springs are arranged in the internal cavity of the collision seat. 6. The anti-falling device for hooks as claimed in claim 5, characterized in that: it also includes two guide plates for guiding the hook assembly, the upper ends of the two guide plates are connected with the front wall and the rear wall respectively. The lower end faces are fixed, and the lower ends are respectively downward and inclined in opposite directions. 7. The hook fall prevention device according to claim 5, characterized in that: the horizontal plane where the highest points of the lower hook heads of the two fall prevention hooks is located is lower than the lower end surface of the collision steel. 8. The anti-falling device for hooks according to claim 5, characterized in that: it also includes two limiting shafts horizontally arranged in the collision seat and used to limit the two anti-falling hooks, the two limiting The left and right ends of the shaft are vertically connected to the left wall and the right wall of the collision seat, and the two limiting shafts are spaced apart from each other to form a limiting space, and the two anti-falling hooks are respectively installed on the left and right sides of the limiting space sides. 9. The hook fall prevention device according to claim 8, further comprising a guide shaft, the upper end of the guide shaft is fixedly connected to the two position-limiting shafts, and the lower end extends vertically downward, so that The lower end of the guide shaft has a downward taper; A guide seat is provided at a position where the upper end surface of the hook assembly corresponds to the guide shaft, and a taper hole matching the taper of the lower end of the guide shaft vertically penetrates through the guide seat. 10. The hook fall prevention device according to any one of claims 1 to 9, characterized in that: the hook assembly includes two splints that are vertical and spaced from each other, and inside the two splints Second fixed guide wheels corresponding to the first fixed guide wheels are respectively arranged on the left and right sides; The hanger is a portal frame, and the two portal frames are respectively arranged on the upper end of the hook assembly at positions corresponding to the two lower hook heads. When the connection is disassembled, the distance between the two gantry frames is less than the distance between the outer surfaces of the lower hook heads before the two anti-fall hooks are compressed.