Front shield screw machine sleeve surfacing tooling, automatic surfacing equipment and surfacing method

Abstract

The present invention provides a front shield spiral machine sleeve surfacing welding tool, automatic surfacing equipment and surfacing method, wherein the front shield spiral machine sleeve surfacing welding tool, the spiral machine sleeve includes a cylinder and a flange arranged at one end of the cylinder and fixedly connected to the cylinder, the cylinder and the flange are welded with a surfacing layer inside, the end of the cylinder without the flange has a beveled section, the two spiral machine sleeves cooperate with each other through the beveled sections arranged at one end of the cylinder to form a cylindrical structure, there is a gap between the beveled sections of the two cylinders and the two cylinders are connected by a plurality of connecting plates. The present invention solves the technical problems of automatic continuous welding on the beveled cylinder and anti-peeling of the thick surfacing layer by combining two spiral machine sleeves, formulating a reasonable welding process and adopting specific automatic surfacing equipment, and reduces the production and process costs, shortens the production cycle, and forms a set of mature front shield spiral machine sleeve manufacturing process.

Description

Technical Field

[0001] The invention belongs to the technical field of welding, and in particular relates to a front shield screw machine sleeve surfacing welding tool, automatic surfacing welding equipment and a surfacing welding method. Background Art

[0002] The basic principle of the earth pressure balance shield is to use a tangible steel component to excavate the soil along the tunnel design axis and advance forward. The earth pressure balance shield is a closed shield. Another function of the shield is to withstand the pressure from the stratum and prevent the invasion of groundwater or quicksand.

[0003] At present, the shield system of the earth pressure balance shield machine is mainly composed of three sections: the front shield, the middle shield, and the tail shield. The key point of its production lies in the production of the front shield screw machine sleeve, which needs to be welded with a 20-25mm thick cladding layer on the inner wall of the beveled cylinder. However, when performing large-area and thick cladding, how to ensure automatic continuous welding, how to ensure continuous rotation of the beveled cylinder, and how to avoid peeling of the thick cladding layer after welding are all key to production. In addition, one end of the sleeve is a beveled section, and how to unfold the blanking and roll forming also requires careful planning. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a front shield screw machine sleeve surfacing tooling, automatic surfacing equipment and surfacing method to solve the technical problems of automatic continuous welding on beveled cylinders and anti-peeling of thick surfacing layers.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a front shield screw machine sleeve surfacing tooling, the screw machine sleeve includes a cylinder and a flange arranged at one end of the cylinder and fixedly connected to the cylinder, the inside of the cylinder and the flange are welded with a surfacing layer together, the end of the cylinder without the flange has a beveled section, the two screw machine sleeves cooperate with each other through the beveled section arranged at one end of the cylinder to form a cylindrical structure, there is a gap between the beveled sections of the two cylinders and the two cylinders are connected by multiple connecting plates.

[0006] Furthermore, the thickness of the surfacing layer is 20-25 mm, and the gap between the oblique cross sections of the two cylinders is 20-30 mm.

[0007] Furthermore, the plurality of connecting plates are arranged at intervals along the circumference of the cylindrical structure.

[0008] The automatic cladding equipment comprises a CO2 welding machine wire feeding mechanism, a CO2 welding gun, a welding arm and a welding manipulator. The welding arm is arranged in a horizontal direction and installed on the welding manipulator. The welding manipulator is used to drive the welding arm to perform axial telescopic movement and axial rotation movement. The free end of the welding arm is provided with a mounting plate in a vertical direction, and the CO2 welding machine wire feeding mechanism is installed on the mounting plate. The CO2 welding gun is installed on the CO2 welding machine wire feeding mechanism and the welding end of the CO2 welding gun faces the inner wall of a cylinder. An extended guide rod is arranged between the CO2 welding gun and the CO2 welding machine wire feeding mechanism. A welding wire reel is also arranged on the top of the welding arm. The welding wire wound on the welding wire reel passes through the CO2 welding machine wire feeding mechanism and the extended guide rod in sequence and then enters the CO2 welding gun.

[0009] Furthermore, the bottom end of the CO2 welding gun is lower than the bottom end of the mounting plate.

[0010] A surfacing method comprises the following steps:

[0011] Step 1) Draw a cutting line on the square plate after cutting, and then roll it into a circle. When rolling, the cutting line is located on the outer circle;

[0012] Step 2), after rolling, the roundness is corrected, and then the cutting line is drawn to form two cylinders of the screw machine sleeve, and the contact surfaces of the two cylinders are mutually matched bevel sections; a gap of 20-30mm is opened between the bevel sections of the two cylinders, and the two cylinders are connected by several connecting plates;

[0013] Step 3) After the flanges are assembled on both sides of the two cylinders, they are hoisted onto a turntable to achieve continuous automatic rotation of the live parts, thereby achieving continuous automatic welding of the weld between the flange and the cylinder.

[0014] Furthermore, the connecting plate and the two cylinders are connected by spot welding.

[0015] Furthermore, in step 3), when the weld between the flange and the cylinder is continuously and automatically welded, the above-mentioned automatic surfacing equipment is used for welding.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention solves the technical problems of automatic continuous welding on bevel-cut cylinders and anti-peeling of thick cladding layers by combining two screw machine sleeves, formulating a reasonable welding process and adopting specific automatic cladding equipment, and reduces production and process costs, shortens the production cycle, and forms a mature front shield screw machine sleeve manufacturing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the existing front shield screw machine sleeve;

[0018] Figure 2It is a structural schematic diagram of the sleeve surfacing welding tooling of the front shield screw machine of the present invention;

[0019] Figure 3 It is a schematic diagram of the cutting line drawn on the square plate after the sleeve of the existing front shield screw machine is cut;

[0020] Figure 4 It is a schematic diagram of the cutting line drawn on the square plate after blanking of the present invention;

[0021] Figure 5 It is a structural schematic diagram of the automatic surfacing equipment in the present invention;

[0022] Markings in the figure: 1. Cylinder, 2. Flange, 3. Overlay layer, 4. Bevel section, 5. Connecting plate, 6. CO2 welding machine wire feeding mechanism, 7. CO2 welding gun, 8. Welding arm, 9. Welding manipulator, 10. Mounting plate, 11. Extended guide rod, 12. Wire reel. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0024] The structure of the existing front shield screw machine sleeve is as follows Figure 1 As shown, it includes a cylinder 1 and a flange 2 arranged at one end of the cylinder and fixedly connected to the cylinder. The cylinder 1 and the flange 2 are welded with a surfacing layer 3 inside. The end of the cylinder 1 without the flange 2 has a beveled section 4. The thickness of the surfacing layer 3 is 20-25mm, and the hard layer requires HRC53-58. The difficulties in making this part are: 1. One end of the cylinder 1 is a beveled section, which cannot be directly rolled; 2. There is no ready-made automatic surfacing equipment, and automatic surfacing cannot be achieved. If manual surfacing is used, the internal heating process needs to be welded, which cannot be operated; 3. After the surfacing layer, it is very easy to peel off.

[0025] The present invention innovatively adopts cross-machine production, and two machines are used for material joining. On the one hand, it solves the problem that a single piece cannot be directly rolled, and on the other hand, it saves the time of cutting the remaining material after rolling. The most important thing is that the weld between the flange 2 and the cylinder 1 can be automatically welded, which saves materials, improves production efficiency, and ensures the quality of the weld between the flange and the cylinder. The schematic diagram of the cutting line drawn on the square plate after the sleeve of the existing front shield screw machine is shown as follows Figure 3 shown.

[0026] The present invention provides a front shield screw machine sleeve surfacing tool, such as Figure 2As shown, the two screw machine sleeves cooperate with each other through the beveled section 4 set at one end of the cylinder 1 to form a cylindrical structure, there is a gap between the beveled sections 4 of the two cylinders 1, and the two cylinders are connected by a plurality of connecting plates 5. Further, the gap between the beveled sections of the two cylinders 1 is 20-30 mm.

[0027] The surfacing method of the surfacing tool comprises the following steps:

[0028] Step 1), after cutting, a cutting line is drawn on the square plate. The schematic diagram of the cutting line drawn on the square plate after cutting of the present invention is as follows: Figure 4 As shown, the process is then rolled, and the cutting line is located at the outer circle during the rolling process;

[0029] Step 2), after rolling, the roundness is corrected, and then the cutting line is drawn to form two cylinders of the screw machine sleeve. The contact surfaces of the two cylinders 1 are mutually matched bevel sections 4; a gap of 20-30mm is opened between the bevel sections of the two cylinders 1, and the two cylinders 1 are connected by a plurality of connecting plates 5;

[0030] Step 3), after the flanges 2 are integrally assembled on both sides of the two cylinders 1, they are hoisted onto a turntable to achieve continuous automatic rotation of the live parts, thereby achieving continuous automatic welding of the weld between the flange 2 and the cylinder 1.

[0031] The present invention uses the following automatic surfacing equipment when continuously and automatically welding the weld between the flange 2 and the cylinder 1, such as Figure 5 As shown, it includes a CO2 welding machine wire feeding mechanism 6, a CO2 welding gun 7, a welding arm 8 and a welding manipulator 9. The welding arm 8 is arranged in the horizontal direction and mounted on the welding manipulator 9. The welding manipulator 9 is used to drive the welding arm to perform axial telescopic movement and axial rotation movement. The free end of the welding arm 8 is provided with a mounting plate 10 in the vertical direction. The mounting plate 10 is provided with a CO2 welding machine wire feeding mechanism 6. The CO2 welding gun 7 is installed on the CO2 welding machine wire feeding mechanism 6, and the welding end of the CO2 welding gun 7 is facing the inner wall of the cylinder 1. An extended guide rod 11 is provided between the CO2 welding gun 7 and the CO2 welding machine wire feeding mechanism 6. A welding wire reel 12 is also provided on the top of the welding arm 8. The welding wire wound on the welding wire reel 12 passes through the CO2 welding machine wire feeding mechanism 6 and the extended guide rod 11 in sequence and then enters the CO2 welding gun 7. Further, the bottom end of the CO2 welding gun 7 is lower than the bottom end of the mounting plate 10.

[0032] In this embodiment, the wire feeding mechanism 6 of the CO2 welding machine can be removed from the existing CO2 welding machine for use, and then the wire feeding mechanism on the existing welding operating machine can be removed and the two can be used in combination; the extended guide rod 11 is a hollow structure, which can be modified from the existing CO2 welding gun, specifically, the CO2 welding gun is cut from the gun handle, and the bent pipe is baked red and then straightened, and then directly connected to the wire feeding mechanism as an extended guide rod, as a welding gun of the automatic cladding operating machine.

[0033] The model of the welding operator used in this embodiment is: Welding Weida CZ22-4.5×5. The mounting plate 10 is a steel plate of δ=12*200*400 (material: Q235B), and 4-Φ12 connection holes are drilled on the steel plate, wherein the size and hole spacing of the holes are determined according to the size and position of the bolt holes connecting the wire feeding mechanism on the CO2 welding machine and the operator. The wire feeding mechanism of the CO2 welding machine is bolted to the mounting plate 10 by bolting, and then connected to the head of the welding operator, that is, the wire feeding mechanism of the CO2 welding machine is used as the wire feeding mechanism of the operator, so as to realize CO2 continuous welding.

[0034] In addition, the present invention innovatively adopts the "sandwich transition layer" method during continuous automatic welding, which not only ensures the wear resistance of the cladding layer, but also ensures the toughness of the cladding layer, thereby solving the problem of easy peeling of the thick cladding layer. The thickness of the cladding layer on the inner wall of the sleeve is 20-25mm, and the thickness of each layer is 3-4mm: the 1st and 2nd layers use LQ556-Φ1.6, the 3rd and 4th layers use ER50-6-Φ1.2, and the 5th and 6th layers use LQ556-Φ1.6. The specific cladding process parameters are shown in the table below.

[0035]

[0036] The present invention solves the technical problems of realizing automatic continuous welding on the bevel-cut cylinder and preventing the thick cladding layer from peeling off by combining two screw machine sleeves, formulating a reasonable welding process and adopting specific automatic cladding equipment, reduces the production and process costs, shortens the production cycle, and forms a mature front shield screw machine sleeve manufacturing process.

[0037] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A surfacing method for surfacing a front shield screw machine sleeve, the screw machine sleeve comprising a barrel and a flange arranged at one end of the barrel and fixedly connected to the barrel, the barrel and the flange are welded with a surfacing layer, and the end of the barrel without the flange has a chamfered section, characterized in that: Surfacing welding includes the following steps; Step 1) Draw a cutting line on the square plate after cutting, and then roll it into a circle. The cutting line is located on the outer circle during rolling. Step 2), after rolling, correct the roundness, and then cut according to the drawn cutting line, and after cutting, two cylinders of the screw machine sleeve are formed, and the contact surfaces of the two cylinders are mutually matched bevel sections; pull a 20-30mm gap between the bevel sections of the two cylinders, and connect the two cylinders through several connecting plates to form the front shield screw machine sleeve surfacing tooling; Step 3), after the flanges on both sides of the two cylinders are assembled as a whole, the turntable is hoisted and the automatic surfacing equipment is used to realize the continuous automatic welding of the weld between the flange and the cylinder; the thickness of the surfacing layer on the inner wall of the sleeve is 20-25mm, and the thickness of each layer is 3-4mm; among them, the 1st and 2nd layers use LQ556-Φ1.6, the welding current is 210-230A, the welding voltage is 24-28V, and the welding speed is 0.4-0.6m / min; the 3rd and 4th layers use ER50-6-Φ1.2, the welding current is 200-250A, the welding voltage is 22-26V, and the welding speed is 0.4-0.6m / min; the 5th and 6th layers use LQ556-Φ1.6, the welding current is 210-230A, the welding voltage is 24-28V, and the welding speed is 0.4-0.6m / min.

2. A surfacing method according to claim 1, characterized in that: The connecting plate and the two cylinders are connected by spot welding.

3. A surfacing method according to claim 1, characterized in that: The plurality of connecting plates are arranged at intervals along the circumference of the cylindrical structure.

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