CN112027898A

CN112027898A - Tunnel bridge road construction is with grab bucket that paves with screening function

Info

Publication number: CN112027898A
Application number: CN202010880560.6A
Authority: CN
Inventors: 左金伟
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-08-27
Filing date: 2020-08-27
Publication date: 2020-12-04

Abstract

The invention discloses a paving grab bucket with a screening function for tunnel bridge road construction, belonging to the grab bucket field, the paving grab bucket with the screening function for tunnel bridge road construction can continuously ventilate and deflate to the expanding and contracting self-stirring ball and the gas pipe after grabbing materials through the arrangement of a self-vibration screening net, thereby enabling the self-vibration ball to continuously expand and contract, further enabling the grabbed materials to have certain vibration and loosening effects, being convenient for screening, obviously reducing the cost investment compared with the mechanical stirring in the prior art, simultaneously matching the action of the self-vibration ball, separating the self-vibration ball under the action of material gravity, enabling the separated self-vibration ball to be in an unstable state under the action of repulsion force between the self-vibration ball and a repulsion ring layer, driving the screening node to vibrate, further enabling the materials at the pore position of the self-vibration screening net to pass more smoothly, the condition that the hole department is blockked up takes place when effectively avoiding screening, makes screening effect and efficiency higher.

Description

Tunnel bridge road construction is with grab bucket that paves with screening function

Technical Field

The invention relates to the field of grab buckets, in particular to a paving grab bucket with a screening function for tunnel bridge road construction.

Background

The grab bucket is a special tool for grabbing dry and scattered goods by a crane. Two or more openable bucket-shaped jaws are combined together to form an object containing space, the jaws are closed in a material pile during loading, materials are grabbed into the object containing space, the jaws are opened in a suspended state above the material pile during unloading, the materials are scattered on the material pile, and the opening and closing of the jaws are generally controlled by a steel wire rope of a crane hoisting mechanism. The grab bucket operation has no heavy physical labor, can achieve higher loading and unloading efficiency and ensure safety, and is a main dry bulk cargo loading and unloading tool for ports. According to the kind of the operation goods, the operation goods can be divided into an ore grab bucket, a coal grab bucket, a grain grab bucket, a wood grab bucket and the like.

The grab bucket is used for grabbing silt stones and various bulk cargos, and can be opened and closed, namely a lifting appliance for discharging bulk materials mainly by opening and closing a left grab flap and a right grab flap, along with the rapid development of the countries in recent years, more and more places are needed for tunnel bridge road construction, the raw materials with various particle diameters are required to be used in the construction of the tunnel bridge road, and the grab bucket is required to be used in the process of conveying the raw materials for the construction of the tunnel bridge road into the transport vehicle, and the materials with various particle sizes need to be classified and screened for use, the existing grab buckets do not have screening or need to put mechanical force for screening, so that the particle size of the whole material is relatively narrow, the material needs to be screened again in the later period, the working efficiency is influenced, and carry out mechanical vibration with higher speed screening through the agitator, lead to the cost to drop into the grow easily to the agitator still influences its snatching to the material in the grab bucket easily.

Disclosure of Invention

1. Technical problem to be solved

Aiming at the problems in the prior art, the invention aims to provide a paving grab bucket with a screening function for tunnel bridge road construction, which can enable the grab bucket to have the screening function through the arrangement of a self-vibration screening net, after the grab bucket grabs materials, the grab bucket can continuously ventilate and deflate to an expansion self-stirring ball and the inner part of a gas transmission pipe along an air channel through an inflation pipe, so that the expansion self-stirring ball is continuously expanded and reduced, the grabbed materials can be vibrated and loosened to a certain degree, the screening effect of the grab bucket is better, the self-vibration ball is separated under the action of the gravity of the materials under the matching of the self-vibration ball in a screening node, and simultaneously, due to the repulsion function between the self-vibration ball and a repulsion ring layer, the separated self-vibration ball is in an unstable state, so that the screening node is driven to vibrate, thereby effectively improve the patency when the hole material of self-vibration screening net department passes through, effectively avoid self-vibration screening net to take place by the condition that is blockked up when screening for screening effect and efficiency are higher.

2. Technical scheme

In order to solve the above problems, the present invention adopts the following technical solutions.

A paving grab bucket with a screening function for tunnel bridge road construction comprises a mounting plate fixedly mounted on a crane, wherein the lower end of the mounting plate is rotatably connected with two support arms, one end of each support arm, which is far away from the mounting plate, is fixedly connected with a grab flap, one end of each grab flap, which is close to each other, is connected with a central rotating plate, the central rotating plate is rotatably connected with the two grab flaps respectively, a hydraulic rod is mounted between the central rotating plate and the mounting plate, a self-vibration screening net is fixedly connected between the lower inner wall of each grab flap and the lower end of the central rotating plate, the self-vibration screening net comprises a plurality of longitudinal net wires and transverse net wires which are vertically and horizontally staggered, screening nodes are connected at a plurality of intersections of the longitudinal net wires and the transverse net wires, one end of each screening node, which is close to a grab flap opening, is fixedly connected with a hard connecting rod, and the end, the air delivery pipes are connected between the expansion and contraction self-stirring balls, the air channels are arranged in the left and right inner parts of the central rotating plate, the upper port part of each air channel is fixedly connected with an inflation pipe, the lower port part of each air channel is fixedly connected with the uppermost air delivery pipe, and the grab bucket can have a screening function through the arrangement of the self-vibration screening net, after materials are grabbed, the inflation pipes can continuously ventilate and deflate to the expansion and contraction self-stirring balls and the inner parts of the air delivery pipes along the air channels, so that the expansion and contraction self-stirring balls are continuously expanded and contracted, certain vibration and loosening effects can be carried out on the grabbed materials, the screening effect of the grab bucket is better, the self-vibration balls are separated under the gravity action of the materials under the action of the repulsion force between the material gravity layers, and the separated self-vibration balls are in an unstable state due to the repulsion force between the material and repulsion ring layers, thereby drive the screening node and take place vibrations to effectively improve the patency when passing through from the hole material of vibration screening net department, effectively avoid the condition emergence that self-vibration screening net blockked up when the screening, make screening effect and efficiency higher.

Further, gas tube, wind channel, gas-supply pipe and breathing all communicate each other from stirring between the ball for after snatching the material, can carry out incessant ventilation and gassing from stirring ball and gas-supply pipe inside along the wind channel to the breathing through the gas tube, thereby make the breathing from stirring the continuous condition of taking place the inflation and reducing of ball, and then can carry out certain vibrations and not hard up effect to the material of snatching, and then make the screening effect of this grab bucket better.

Further, the outer end of the expansion and contraction self-stirring ball is wrapped by an outer multi-angle layer, the outer surface of the outer multi-angle layer is in a multi-convex irregular shape, and through the outer multi-angle layer, when the expansion and contraction self-stirring ball expands and contracts, the stirring effect on nearby materials is effectively increased, and the screening effect of the grab bucket is further improved.

Further, the gas-supply pipe is made for stereoplasm non-elastic material, effectively guarantees that the gas-supply pipe is difficult for the material to flatten, and then effectively guarantees gaseous to the normal transport in the breathing self-stirring ball, the breathing self-stirring ball is made for the elastic sealing material, and the gas-supply pipe mainly used transmits gas, and the breathing is used as the breathing from stirring ball to the multiple spot vibrations to the material are realized.

Further, screening node center department is provided with from the vibration ball, vertical net twine and horizontal net twine all run through the screening node and with self-vibration ball fixed connection, snatch the material after, the self-vibration ball in the screening node can take place certain vibrations under the effect of the pulling force of material to effectively improve from the unobstructed nature when the hole material of vibration screening net department passes through, effectively avoid the condition emergence that self-vibration screening net blockked up when the screening.

Further, the self-vibrating ball includes a plurality of repulsion ball valves corresponding with vertical net twine and horizontal net twine and connects even rope to between two repulsion ball valves to right, under material action of gravity, vertical net twine and horizontal net twine can receive the dragging, thereby drive a plurality of even rope alternate segregation, thereby, make a plurality of even ropes be close to towards repulsion ring layer and annular pad gradually, at this moment under the effect of the mutual repulsion of even rope and repulsion ring layer, a plurality of even ropes are in unstable state, make even rope constantly shake each other, it takes place vibrations to drive the screening node.

Further, screening node inner wall outside-in fixedly connected with repulsion ring layer and annular pad in proper order, annular pad are used for protecting repulsion ball lamella, when effectively avoiding repulsion ball lamella and annular pad contact, because the material drags the power too big, leads to the cracked condition of repulsion ball lamella atress to take place.

Furthermore, the connecting rope is made of elastic materials, so that the positions of the repulsive ball petals can be changed at any time and can be restored to the original positions after being changed, and the annular cushion is made of flexible materials.

Furthermore, the repulsion ball valve and the repulsion ring layer are made of magnetic materials, and the magnetic poles at the ends, close to each other, of the repulsion ball valve and the repulsion ring layer are the same, so that mutual repulsion force can be generated between the repulsion ball valve and the repulsion ring layer, and unstable vibration can be generated by connecting ropes conveniently.

Further, two the equal fixedly connected with edge shrouding of one end that the grab lamella is close to each other, two the edge shrouding matches each other, snatchs the material when two grab lamellas and merges the back, thereby two edge shroudings can effective gap between two grab lamellas of shutoff each other, and then effectively avoid the material to spill in the grab lamella.

3. Advantageous effects

Compared with the prior art, the invention has the advantages that:

(1) the scheme can enable the grab bucket to have a screening function through the arrangement of the self-vibration screening net, after the grab bucket grabs materials, the inflation tube can continuously ventilate and deflate to the expanding and contracting self-stirring ball and the gas conveying pipe along the air channel, so that the expanding and contracting self-stirring ball continuously expands and contracts, and further the grabbed materials can be vibrated and loosened to a certain extent, the screening effect of the grab bucket is better, the self-vibration ball is separated under the action of material gravity by matching with the action of the self-vibration ball in the screening node, and the separated self-vibration ball is in an unstable state due to the repulsion function between the self-vibration ball and the repulsion ring layer, so that the screening node is driven to vibrate, the smoothness of the self-vibration screening net when the pore materials pass through is effectively improved, and the situation that the self-vibration screening net is blocked during screening is effectively avoided, so that the screening effect and efficiency are higher.

(2) The gas tube, wind channel, gas-supply pipe and breathing are all communicate each other from stirring between the ball for after snatching the material, can carry out incessant ventilation and gassing from stirring ball and gas-supply pipe inside along the wind channel to the breathing through the gas tube, thereby make the breathing from stirring the continuous condition of taking place inflation and reducing of ball, and then can carry out certain vibrations and not hard up effect to the material of snatching, and then make the screening effect of this grab bucket better.

(3) The expansion and contraction has outer polygonal layers from the outer end of the stirring ball, the outer surfaces of the outer polygonal layers are in multi-convex irregular shapes, and through the outer polygonal layers, when the expansion and contraction occur from the stirring ball, the stirring effect on nearby materials is effectively increased, and the screening effect of the grab bucket is further improved.

(4) The gas-supply pipe is made for stereoplasm non-elastic material, effectively guarantees that the gas-supply pipe is difficult for the material to flatten, and then effectively guarantees gaseous to the breathing from stirring the normal transport in the ball, and the breathing is made for the sealed material of elasticity from stirring the ball, and the gas-supply pipe mainly used transmits gas, and the breathing is used as the breathing from stirring the ball to the realization is to the multiple spot vibrations of material.

(5) Screening node center department is provided with from the vibration ball, vertical net twine and horizontal net twine all run through the screening node and with from vibration ball fixed connection, snatch the material after, the self-vibration ball in the screening node is under the effect of pulling of material, can take place certain vibrations to effectively improve the patency when the hole material of self-vibration screening net department passes through, effectively avoid the self-vibration screening net to take place by the condition that is blockked up when the screening.

(6) Self-vibrating ball includes a plurality of and vertical net twine and the corresponding repulsion ball valve of horizontal net twine and connects even rope to between two repulsion ball valves to right, under material action of gravity, vertical net twine and horizontal net twine can receive the dragging, thereby drive a plurality of rope alternate segregation that link, thereby, make a plurality of even ropes be close to towards repulsion ring layer and annular gasket gradually, at this moment under the effect of the mutual repulsion of even rope and repulsion ring layer, a plurality of even ropes are in unstable state, make and link and constantly shake each other, it shakes to drive the screening node.

(7) The inner wall of the screening node is fixedly connected with a repulsion ring layer and an annular pad from outside to inside in sequence, the annular pad is used for protecting a repulsion ball flap, and the condition that the repulsion ball flap is stressed and cracked due to overlarge material pulling force is effectively avoided when the repulsion ball flap is contacted with the annular pad.

(8) The connecting rope is made of elastic materials, so that the mutual positions of the repulsive force ball flaps can be changed at any time, the repulsive force ball flaps can be restored to the original positions after being changed, and the annular cushion is made of flexible materials.

(9) The repulsion ball valve and the repulsion ring layer are made of magnetic materials, and the magnetic poles of the ends, close to each other, of the repulsion ball valve and the repulsion ring layer are the same, so that mutual repulsion force can be generated between the repulsion ball valve and the repulsion ring layer, and unstable vibration of the connecting rope is facilitated.

(10) Two equal fixedly connected with edge shroudings of one end that grab the lamella and be close to each other, two edge shroudings match each other, snatch the material when two grab the lamella and merge the back, thereby two edge shroudings can the gap between two effective shutoff grab lamellas of mutual contact, and then effectively avoid the material to spill in grabbing the lamella.

Drawings

FIG. 1 is a schematic front view of the present invention;

FIG. 2 is a schematic structural view of two grasping pieces of the present invention merged after grasping a material;

FIG. 3 is a schematic view of the structure of the expanding and contracting self-agitating ball portion of the present invention;

FIG. 4 is a schematic structural view of a self-vibrating screening mesh portion of the present invention;

FIG. 5 is a schematic of the structure at a screening node of the present invention;

fig. 6 is a schematic structural view of the self-vibrating balls separated from each other in the screening node according to the present invention.

The reference numbers in the figures illustrate:

the device comprises a hydraulic rod 1, a mounting plate 2, a support arm 3, a center rotating plate 4, an inflation tube 5, a gripping flap 6, an edge sealing plate 7, a self-vibration screening net 8, a longitudinal net line 81, a transverse net line 82, a repulsive force ball flap 83, a connecting rope 84, a screening node 9, a repulsive force ring layer 91, a ring-shaped cushion 92, a hard connecting rod 10, an expansion and contraction self-stirring ball 11, a gas pipe 12 and a multi-angle layer outside 13.

Detailed Description

The drawings in the embodiments of the invention will be combined; the technical scheme in the embodiment of the invention is clearly and completely described; obviously; the described embodiments are only some of the embodiments of the invention; but not all embodiments, are based on the embodiments of the invention; all other embodiments obtained by a person skilled in the art without making any inventive step; all fall within the scope of protection of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1:

please refer to fig. 1, a tunnel bridge road construction is with grab bucket that paves with screening function, including fixed mounting panel 2 on the hoist, the lower extreme of mounting panel 2 rotates and is connected with two support arms 3, the equal fixedly connected with of one end that mounting panel 2 was kept away from to two support arms 3 grabs lamella 6, the one end that two grabs lamella 6 are close to each other is connected with central commentaries on classics board 4, central commentaries on classics board 4 rotates with two grabs lamella 6 respectively and is connected, install hydraulic stem 1 between central commentaries on classics board 4 and the mounting panel 2, the equal fixedly connected with edge shrouding 7 of one end that two grabs lamella 6 are close to each other, two edge shrouding 7 match each other, after two grabs lamella 6 snatch the material to merge, thereby two edge shrouding 7 can contact each other and effectively block up the.

Referring to fig. 2, a self-vibration screening net 8 is fixedly connected between the lower inner wall of the grab flap 6 and the lower end of the central rotating plate 4, referring to fig. 4, the self-vibration screening net 8 comprises a plurality of longitudinal net wires 81 and transverse net wires 82 which are criss-cross, screening nodes 9 are connected at a plurality of intersections of the longitudinal net wires 81 and the transverse net wires 82, one end of each screening node 9, which is close to the mouth of the grab flap 6, is fixedly connected with a hard connecting rod 10, the end of the hard connecting rod 10 is fixedly connected with an expansion and contraction self-stirring ball 11, gas pipes 12 are connected between the expansion and contraction self-stirring balls 11, air channels are arranged in the left and right inner parts of the central rotating plate 4, the air channels are air holes penetrating through the central rotating plate 4, not shown in the figure, an inflation pipe 5 is fixedly connected at the upper end mouth of each air channel, the lower end mouth of each air channel is fixedly connected with the uppermost gas pipe 12, the inflation, after grabbing the material, can carry out incessant ventilation and gassing to the breathing from stirring ball 11 and gas-supply pipe 12 inside along the wind channel to the breathing through gas tube 5 to make the breathing from stirring the continuous condition of taking place inflation and reducing of ball 11, and then can carry out certain vibrations and not hard up effect to the material of grabbing, and then make the screening effect of this grab bucket better.

Referring to fig. 3, the outer end of the expansion and contraction self-stirring ball 11 is wrapped with an outer polygonal layer 13, the outer surface of the outer polygonal layer 13 is in a multi-convex irregular shape, and the outer polygonal layer 13 effectively increases the stirring effect on nearby materials when the expansion and contraction self-stirring ball 11 expands and contracts, so that the screening effect of the grab bucket is further improved, the gas pipe 12 is made of a hard non-elastic material, the gas pipe 12 is effectively prevented from being flattened by the materials, the normal conveying of gas into the expansion and contraction self-stirring ball 11 is effectively guaranteed, the expansion and contraction self-stirring ball 11 is made of an elastic sealing material, the gas pipe 12 is mainly used for transmitting the gas, and the expansion and contraction self-stirring ball 11 is used for expansion and contraction, so that the multipoint vibration of the materials is realized.

Referring to fig. 5, a self-vibrating ball is arranged in the center of the screening node 9, a longitudinal mesh wire 81 and a transverse mesh wire 82 both penetrate through the screening node 9 and are fixedly connected with the self-vibrating ball, after the material is grabbed, the self-vibrating ball in the screening node 9 can vibrate to a certain extent under the pulling force of the material, so that the smoothness of the passing of the pore material at the self-vibrating screening network 8 is effectively improved, the self-vibrating screening network 8 is effectively prevented from being blocked during screening, the self-vibrating ball comprises a plurality of repulsive force ball flaps 83 corresponding to the longitudinal mesh wire 81 and the transverse mesh wire 82 and a connecting rope 84 connected between the two repulsive force ball flaps 83 facing to each other, referring to fig. 6, under the gravity action of the material, the longitudinal mesh wire 81 and the transverse mesh wire 82 are pulled to drive the plurality of connecting ropes 84 to separate from each other, so that the plurality of connecting ropes 84 gradually approach towards the repulsive force ring layer 91 and the annular pad 92, at this time, under the action of mutual repulsion of the connecting ropes 84 and the repulsive annular layer 91, the connecting ropes 84 are in an unstable state, so that the connecting ropes 84 continuously vibrate with each other to drive the screening node 9 to vibrate;

the inner wall of the screening node 9 is fixedly connected with a repulsive force ring layer 91 and an annular pad 92 from outside to inside in sequence, the annular pad 92 is used for protecting the repulsive force ball flap 83, when the contact between the repulsive force ball flap 83 and the annular pad 92 is effectively avoided, the condition that the repulsive force ball flap 83 is stressed and cracked is caused due to the fact that the material dragging force is too large, the connecting rope 84 is made of elastic materials, the positions of the repulsive force ball flaps 83 among each other can be changed at any time, the original positions can be restored after the change, the annular pad 92 is made of flexible materials, the repulsive force ball flap 83 and the repulsive force ring layer 91 are made of magnetic materials, magnetic poles of one ends, close to each other, of the repulsive force ball flaps 83 and the repulsive force ring layer 91 are the same, the mutual repulsive force between the repulsive force ball flaps and the connecting.

Through the arrangement of the self-vibration screening net 8, the grab bucket has a screening function, after the grab bucket grabs materials, the materials can be continuously ventilated and deflated from the stirring ball 11 and the gas pipe 12 along the air channel through the inflation tube 5, so that the expansion self-stirring ball 11 continuously expands and contracts, and further the grabbed materials can be subjected to certain vibration and loosening effects, compared with the mechanical stirring in the prior art, the cost investment is obviously reduced, the self-vibration ball in the screening node 9 is matched, under the action of material gravity, the self-vibration ball is separated, meanwhile, due to the repulsion function between the self-vibration ball and the repulsion ring layer 91, the separated self-vibration ball is in an unstable state, the screening node 9 is driven to vibrate, the smoothness of the self-vibration screening net 8 when the pore materials pass through is effectively improved, and the situation that the self-vibration screening net 8 is blocked during screening is effectively avoided, so that the screening effect and efficiency are higher.

The above; but are merely preferred embodiments of the invention; the scope of the invention is not limited thereto; any person skilled in the art is within the technical scope of the present disclosure; the technical scheme and the improved concept of the invention are equally replaced or changed; are intended to be covered by the scope of the present invention.

Claims

1. The utility model provides a tunnel bridge road construction is with grab bucket that paves with screening function, includes mounting panel (2) of fixed mounting on the hoist, mounting panel (2) lower extreme rotates and is connected with two support arms (3), two the equal fixedly connected with of one end of mounting panel (2) is kept away from in support arm (3) grabs lamella (6), two grab lamella (6) one end that is close to each other and be connected with central commentaries on classics board (4), central commentaries on classics board (4) rotate with two grabs lamella (6) respectively and be connected, install hydraulic stem (1), its characterized in that between central commentaries on classics board (4) and mounting panel (2): a self-vibration screening net (8) is fixedly connected between the lower inner wall of the grab flap (6) and the lower end of the central rotating plate (4), the self-vibration screening net (8) comprises a plurality of longitudinal net wires (81) and transverse net wires (82) which are crisscrossed, a plurality of intersections of the longitudinal net wires (81) and the transverse net wires (82) are connected with screening nodes (9), one end of the screening node (9) close to the opening part of the grab flap (6) is fixedly connected with a hard connecting rod (10), the end part of the hard connecting rod (10) is fixedly connected with expansion and contraction self-stirring balls (11), gas transmission pipes (12) are connected among the expansion and contraction self-stirring balls (11), the air duct is arranged in the left and right inner parts of the central rotating plate (4), an inflation pipe (5) is fixedly connected to the upper end opening part of the air duct, and the lower end opening part of the air duct is fixedly connected with the uppermost air conveying pipe (12).

2. The paving grab bucket with the screening function for tunnel bridge road construction of claim 1 is characterized in that: the inflation tube (5), the air duct, the air delivery tube (12) and the expansion automatic stirring ball (11) are communicated with each other.

3. The paving grab bucket with the screening function for tunnel bridge road construction of claim 1 is characterized in that: the outer end of the expansion and contraction self-stirring ball (11) is wrapped with an outer multi-angle layer (13), and the outer surface of the outer multi-angle layer (13) is in a multi-convex irregular shape.

4. The paving grab bucket with the screening function for tunnel bridge road construction of claim 3 is characterized in that: the gas transmission pipe (12) is made of hard non-elastic material, and the expansion self-stirring ball (11) is made of elastic sealing material.

5. The paving grab bucket with the screening function for tunnel bridge road construction of claim 1 is characterized in that: screening node (9) center department is provided with from the vibration ball, vertical net twine (81) and horizontal net twine (82) all run through screening node (9) and with from vibration ball fixed connection.

6. The paving grab bucket with the screening function for tunnel bridge road construction of claim 5 is characterized in that: the self-vibration ball comprises a plurality of repulsive ball flaps (83) corresponding to the longitudinal net wires (81) and the transverse net wires (82) and connecting ropes (84) connected between the two repulsive ball flaps (83) facing each other.

7. The paving grab bucket with the screening function for tunnel bridge road construction of claim 6 is characterized in that: and the inner wall of the screening node (9) is fixedly connected with a repulsive force annular layer (91) and an annular pad (92) from outside to inside in sequence.

8. The paving grab bucket with the screening function for tunnel bridge road construction of claim 7 is characterized in that: the connecting rope (84) is made of elastic materials, and the annular pad (92) is made of flexible materials.

9. The paving grab bucket with the screening function for tunnel bridge road construction of claim 8 is characterized in that: the repulsion ball valve (83) and the repulsion ring layer (91) are made of magnetic materials, and the magnetic poles at the ends, close to each other, of the repulsion ball valve (83) and the repulsion ring layer (91) are the same.

10. The paving grab bucket with the screening function for tunnel bridge road construction of claim 1 is characterized in that: two equal fixedly connected with edge shrouding (7) of one end that grab lamella (6) are close to each other, two edge shrouding (7) match each other.