CN111250819A - Method for welding cutter head and cutter of shield machine in high-pressure environment - Google Patents
Method for welding cutter head and cutter of shield machine in high-pressure environment Download PDFInfo
- Publication number
- CN111250819A CN111250819A CN202010094128.4A CN202010094128A CN111250819A CN 111250819 A CN111250819 A CN 111250819A CN 202010094128 A CN202010094128 A CN 202010094128A CN 111250819 A CN111250819 A CN 111250819A
- Authority
- CN
- China
- Prior art keywords
- welding
- pressure
- cutter head
- shield machine
- cutter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
A method for welding a cutter head of a shield tunneling machine in a high-pressure environment comprises the steps of constructing a stratum reinforcing area, establishing a repairing working space, preparing before welding, welding and maintaining and the like. The high-pressure environment self-adaptive arc striking system comprises a high-frequency oscillator, a linear sliding table, a control unit, an air pressure sensor and a welding power supply circuit, wherein the high-frequency oscillator comprises a primary high-voltage transformer and a secondary high-frequency coupling transformer, the two-stage transformer respectively boosts and couples alternating-current input voltage, the control unit controls the linear sliding table to move according to the high-pressure welding environment air pressure measured by the air pressure sensor, high-frequency high voltage adaptive to the environment air pressure is obtained from the secondary side of the high-frequency coupling transformer, the high-frequency high voltage is applied between a welding gun and a cutter head in the welding power supply circuit, high-pressure air between a welding wire and a cutter is broken through, and self-adaptive arc striking is. In addition, the welding wire is a self-protection flux-cored welding wire which is decomposed to form welding pool protective gas, and smoke generated by welding is sucked by a smoke suction machine of the shield machine and is discharged into a water seal tank of the shield machine. The welding method is simple to operate, good in environmental adaptability and high in welding efficiency.
Description
Technical Field
The invention relates to a method for welding a cutter head cutter of a shield machine in a high-pressure environment, which can perform high-quality and high-efficiency welding in a closed high-pressure environment of a cutter head cabin of the shield machine and can perform welding maintenance at any position on different parts of the cutter head cutter.
Background
The shield tunneling machine cutter head and the cutter are subjected to strong impact and high-stress abrasive action, so that abrasion is easy to occur. The worn cutter head cutter is usually required to be subjected to cutting and welding maintenance in a high-pressure environment of a tunnel site. At present, welding maintenance is generally carried out by adopting welding rod welding.
The shield tunneling machine cutter head tool maintenance welding is characterized in that: firstly, the welding workload is large, secondly, the welding relates to various welding positions and the operation space is narrow, thirdly, the supporting difficulty of the outside to the welding operation is large. The welding rod welding that generally adopts at present, its first shortcoming is that welding efficiency is low, and firstly the welding rod is allowwed to use welding current less, and secondly the welding rod needs to be changed for the time reduction of actual welding, and the welder really moves the arc welding time and only has 30% of whole operating time, leads to current shield structure machine cutter head cutter maintenance cycle very long, seriously influences tunnel through period. A second disadvantage of welding with welding rods is the waste of welding material, and a portion of the total length of each welding rod can only be discarded. The third disadvantage of the welding rod welding is that when the welding rod is used for welding in a narrow area at the corner of a cutter head and a cutter, the welding rod needs to be bent to reach the welding area for welding. A fourth disadvantage of the weld bead is that the formed appearance of the weld bead is not aesthetically pleasing. Therefore, a new welding technology is needed to improve the maintenance level of the cutter head cutter of the shield tunneling machine.
For a welding and cutting power supply, if the working current is set to be 270A, in order to form an arc smoothly under one atmospheric pressure, the arc striking voltage is required to be higher than 3kV, and the arc striking frequency is required to be higher than 200kHz, so that the neutral medium gas can be broken down smoothly to form the arc.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the welding method of the cutter head cutter of the shield machine in the high-air-pressure environment, the method can carry out welding maintenance on different parts of the cutter head cutter in the closed high-air-pressure environment of the cutter head cabin of the shield machine, and can greatly improve the welding efficiency.
On one hand, the shield machine cutter head cutter welding method in the high-pressure environment adopts the high-pressure environment self-adaptive arc striking system to provide high frequency and high voltage required by welding for a welding power supply loop according to the actual environment gas pressure of the high-pressure environment, puncture high-pressure air between a welding wire and a shield machine cutter head, and ignite electric arcs for welding.
On the other hand, the self-shielded flux-cored wire is adopted to replace the welding rod. The allowable welding current of the self-shielded flux-cored wire is far larger than that of a welding rod, the welding wire is continuously fed, and the self-shielded flux-cored wire is decomposed to form welding pool protective gas without additionally supplying the protective gas. The welding efficiency of the self-protection flux-cored wire is 3-5 times that of welding rod welding, no welding material is wasted, the self-protection flux-cored wire can be conveniently used in narrow areas, and the welding seam is attractive. Moreover, the self-protection flux-cored wire has excellent all-position welding performance, can meet the requirement of complex shield cutter head maintenance, and can improve the mechanical property of a welding seam through a flux-cored formula. In addition, compared with gas shielded welding, the self-shielded flux-cored wire welding does not need shielding gas supply, thereby simplifying the welding process and reducing the supporting requirement of the outside on welding operation.
The invention relates to a method for welding cutter heads of a cutter head of a shield machine in a high-pressure environment, wherein the shield machine comprises a human cabin, an air cushion cabin and the cutter head cabin, the human cabin is provided with a human cabin door, the air cushion cabin is provided with an air cushion cabin door and an air cushion cabin flange, the cutter head cabin is provided with a cutter head cabin door and a cutter head cabin flange, and a cutter head is positioned in the cutter head cabin; the method comprises the following steps:
(1) constructing a stratum consolidation area and establishing a repair working space
Firstly, reinforcing the stratum around a cutter head of a shield tunneling machine to form a stratum reinforcing area required by maintenance operation, protecting the tunnel face of the stratum reinforcing area by using a mud film so as to form a repair working space, then filling compressed air into the repair working space to balance the pressure of stratum mud water, and arranging an air pressure sensor in the repair working space for measuring the pressure of environmental gas in the repair working space;
(2) preparation before welding
Before welding maintenance operation, arranging a wire feeder and a welding gun in a repair working space, sequentially penetrating the anode and the cathode of a welding cable of the high-pressure environment self-adaptive arc striking system through an air cushion cabin flange and a cutter cabin flange of a shield machine, and then respectively connecting the anode and the cathode with a cutter of the wire feeder and the shield machine to form a welding loop;
(3) welding maintenance
During welding maintenance operation, a welder enters a man-machine compartment of the shield machine through a man-machine compartment door of the shield machine, and pressurizes the man-machine compartment to enable the man-machine compartment to be equal to the pressure given during tunneling of the shield machine, and pressurization is carried out according to the pressure level of the cutter head compartment and a diving decompression meter; after pressurization is finished, a welder enters an air cushion cabin through an air cushion cabin door of the shield machine and then enters a repair working space through a cutter head cabin door, a welding gun is operated to weld a cutter head of the shield machine, the high-pressure environment self-adaptive arc striking system provides corresponding high-frequency high pressure in a self-adaptive mode according to the environment gas pressure in the repair working space, and the high-frequency high pressure punctures high-pressure air between the welding gun and the cutter head to ignite electric arcs;
and after the welding maintenance operation is finished, the welder returns to the man compartment of the shield machine according to the reverse sequence, decompression is carried out on the man compartment of the shield machine, the welder must carry the oxygen breathing mask and must close the cabin door of the cutter head compartment and the cabin door of the air cushion compartment before decompression is carried out, the decompression is carried out according to the pressure level of the cutter head compartment and the diving decompression meter, and after the decompression is finished, the welder goes out of the compartment through the cabin door of the man compartment of the shield machine.
The welding method adopts a unique high-pressure environment self-adaptive arc striking system, can control the linear sliding table to slide in a self-adaptive manner according to the gas pressure of the high-pressure welding environment, provides adaptive high-frequency high voltage for a welding power circuit, applies the high-frequency high voltage between the welding gun and the cutter, breaks down the high-pressure air between the welding wire and the cutter, and strikes an electric arc.
The welding method provided by the invention is simple and safe to operate, good in environmental adaptability and high in welding efficiency.
Drawings
FIG. 1 is a schematic structural diagram of a shield tunneling machine cutter head and cutter welding device in a high-pressure environment according to the present invention;
FIG. 2 is a schematic diagram of the high pressure environment adaptive arc ignition system of the present invention;
fig. 3 is a circuit diagram of the control unit of the present invention.
In the figure: 1-high-pressure environment self-adaptive arc ignition system, 2-wire feeder, 3-self-protection flux-cored wire, 4-welding gun, 5-shield machine, 5-1-water seal tank, 5-2-man cabin door, 5-3-man cabin, 5-4-air cushion cabin door, 5-5-air cushion cabin flange, 5-6-air cushion cabin, 5-7-cutter cabin door, 5-8-cutter cabin flange, 5-9-cutter, 5-10-smoking machine, 5-11-stratum reinforcement area, 6-repair working space, 11-high-frequency oscillator, T1-primary high-voltage transformer, T2-secondary high-frequency coupling transformer, 12-linear sliding table, 13-control unit, 14-air pressure sensor, 15-welding power supply circuit, P-spark gap discharger and C-oscillating capacitor.
Detailed Description
The welding apparatus and the welding method according to the present invention will be described in detail with reference to the accompanying drawings.
First, the welding apparatus of the present invention will be described.
As shown in figure 1, the shield machine 5 comprises a human cabin 5-3, an air cushion cabin 5-6, a cutter head cabin, a smoking machine 5-10 and a water seal tank 5-1. Wherein, the cutter head 5-9 is positioned in the cutter head cabin, the human cabin 5-3 is provided with a human cabin door 5-2, the air cushion cabin 5-6 is provided with an air cushion cabin door 5-4 and an air cushion cabin flange 5-5, and the cutter head cabin is provided with a cutter head cabin door 5-7 and a cutter head cabin flange 5-8.
The shield machine cutter head and cutter welding device under the high-pressure environment comprises a high-pressure environment self-adaptive arc ignition system 1 (also called as a high-pressure environment welding power supply), a wire feeder 2 and a welding gun 4, wherein the welding gun 4 adopts a self-protection flux-cored wire 3. The wire feeder 2 and the welding gun 4 are arranged in a repair working space 6 in a tunneling tunnel, and the anode and the cathode of a welding cable of the high-pressure environment self-adaptive arc ignition system 1 sequentially penetrate through an air cushion cabin flange 5-5 and a cutter head cabin flange 5-8 of the shield tunneling machine 5 and are respectively connected with a cutter head 5-9 of the wire feeder 2 and the shield tunneling machine 5 to form a welding loop.
The smoke suction machine 5-10 is arranged near the welding gun 4 in the repair working space 6, preferably arranged right above the welding gun 4, and the smoke suction machine 5-10 is connected to a water seal tank 5-1 outside the shield machine through an exhaust pipeline.
As shown in fig. 2, the high-pressure environment adaptive arc ignition system 1 employed in the present invention includes a high-frequency oscillator 11, a linear stage 12, a control unit 13, a pressure sensor 14, and a welding power supply circuit 15. The high-frequency oscillator 11 comprises a primary high-voltage transformer T1 and a secondary high-frequency coupling transformer T2, a linear sliding table 12 is in slidable contact with a secondary coil L2 of the secondary high-frequency coupling transformer T2, a control unit 13 is electrically connected with the linear sliding table 12 and an air pressure sensor 14 arranged in the repair work space 6, and the high-frequency oscillator 11 is connected with a welding power supply loop 15 in a series connection mode. The air pressure sensor 14 measures the air pressure in the repair work space 6 and transmits a pressure signal to the control unit 13, the control unit 13 analyzes and calculates the pressure signal and drives the linear sliding table 12 to move linearly by a corresponding moving distance, high-frequency high voltage corresponding to the pressure signal is obtained, and the welding power supply circuit 15 applies the high-frequency high voltage between the welding gun 4 and the cutter heads 5-9.
As shown in fig. 2, the input of the high-frequency oscillator 11 is an ac power supply signal. The secondary side of a primary high-voltage transformer T1 of the high-frequency oscillator 11 is connected in parallel to the spark gap discharger P, and the secondary side of a primary high-voltage transformer T1 is connected in series to the oscillating capacitor C and then to the primary side of a secondary high-frequency coupling transformer T2, and the secondary side of the secondary high-frequency coupling transformer T2 is connected in series to the welding power supply circuit 15. The secondary coil L2 of the secondary high-frequency coupling transformer T2 is a sliding coil, the linear sliding table 12 is provided with a sliding block, the sliding block is connected with a movable sliding sheet, and the movable sliding sheet is in slidable contact with the secondary coil L2.
As shown in fig. 3, the control unit 13 includes a computer, a data acquisition card, a driver, a small servo motor and a reducer, wherein the data acquisition card is installed on a motherboard of the computer, and the driver is connected to a serial port of the computer.
Referring to fig. 2, when the input terminal of the high-frequency oscillator 11 is connected to an ac power supply (e.g., 120V), the ac voltage is boosted (e.g., 5kV) by the primary high-voltage transformer T1 and charges the oscillating capacitor C, so that the terminal voltage of the spark gap discharger P gradually rises and is finally broken down. After the spark gap discharger P is broken down, on the one hand, the secondary circuit of the primary high-voltage transformer T1 is short-circuited to terminate charging of the oscillating capacitor C, and on the other hand, the already charged oscillating capacitor C and the primary coil L1 of the secondary high-frequency coupling transformer T2 form an oscillating circuit. The oscillating voltage U1 generated by the oscillating circuit is coupled by a secondary high-frequency coupling transformer T2 to obtain high-frequency high voltage (e.g. 11.25kV, 56.25 kV).
The control unit drives the linear sliding table to perform linear movement by the following steps: referring to fig. 2-3, the control unit 13 analyzes and calculates the ambient gas pressure in the repair work space 6 measured by the gas pressure sensor 14, determines the moving distance of the linear sliding table 12, and the control unit 13 controls the rotation direction and the rotation angle of the servo motor based on the calculation result, wherein the rotation direction determines whether the servo motor rotates forwards or backwards according to the moving direction required by the linear sliding table, and the rotation angle is determined according to the moving distance required by the linear sliding table. In this way, the driver of the control unit 13 drives the servo motor to rotate according to the required rotation direction and rotation angle, and then drives the slider of the linear sliding table 12 to move linearly after being decelerated by the decelerator. The pressure signal processing and the calculation of the moving distance of the linear sliding table are all completed by corresponding control programs, and are not described herein again.
The moving distance of the linear slide 12 determines the effective output turns of the secondary coil L2 of the secondary high-frequency coupling transformer T2. When the sliding block of the linear sliding table 12 carries the moving slide to make sliding contact with the secondary coil L2 of the secondary high-frequency coupling transformer T2, the effective output coil number of turns of the secondary coil L2 changes along with the movement of the linear sliding table, so that the induced voltage U2 output by the secondary coil L2 also changes. Therefore, according to different ambient gas pressures, different required induced voltages can be obtained from the secondary coil L2, so that the required high-frequency high voltage can be provided for the welding power supply loop 15 to adapt to the requirements of arc striking for different voltages under different ambient gas pressures. Namely, the moving distance of the linear sliding table is adaptively adjusted through the control unit according to the actual environment gas pressure in the welding environment, so that the secondary high-frequency coupling transformer outputs high-frequency high voltage adaptive to the environment gas pressure, and adaptive arc striking is realized.
For example, according to the present invention, under an atmospheric pressure condition, the winding turns of the two-stage transformer are configured such that the first-stage high-voltage transformer T1 boosts the 120V ac power to 5kV, and the second-stage high-frequency coupling transformer T2 boosts the output voltage of the first-stage high-voltage transformer T1 to 11.25 kV. The withstand voltage of the high-voltage ceramic oscillation capacitor C is 25kV, the equivalent capacitance is 4200pF, the inductance of a primary coil L1 of a secondary high-frequency coupling transformer T2 is 6uH, the oscillation frequency is 1MHz, and the arc striking requirement is met.
When the ambient air pressure is increased to 5 atmospheric pressures, the sliding block of the linear sliding table is moved, so that the secondary coil of the secondary high-frequency coupling transformer T2 is connected with a coil (effective output coil) which is 5 times of the original coil, the output voltage of the secondary high-frequency coupling transformer T2 is increased to 56.25kV, and arc striking is achieved.
The welding method of the present invention is described in detail below. The welding method specifically comprises the following steps:
1. constructing a stratum consolidation area and establishing a repair working space
Firstly, reinforcing the stratum around a cutter head 5-9 of a shield machine 5 to form a stratum reinforcing area 5-11 required by maintenance operation, and protecting the tunnel face of the stratum reinforcing area 5-11 by using a mud film, so that a repairing working space 6 is formed in a tunneling tunnel; compressed air is filled into the repair working space 6 to balance the pressure of the formation muddy water, and an air pressure sensor 14 is arranged in the repair working space 6 and used for measuring the pressure of the ambient air in the repair working space 6.
2. Preparation before welding
Before welding maintenance operation, the wire feeder 2 and the welding gun 4 are arranged in a repair working space 6 in a driving tunnel, and then the anode and the cathode of a welding cable of the high-pressure environment self-adaptive arc ignition system 1 sequentially penetrate through an air cushion cabin flange 5-5 and a cutter head cabin flange 5-8 of the shield machine 5 and are respectively connected with a cutter head 5-9 of the wire feeder 2 and the shield machine 5 to form a welding loop.
3. Welding maintenance
During welding maintenance operation, a welder enters a man-machine compartment 5-3 of the shield machine 5 through a man-machine compartment door 5-2 of the shield machine 5, pressurizes the man-machine compartment 5-3 to enable the man-machine compartment to be equal to the pressure given when the shield machine 5 tunnels, and pressurizes according to the pressure level of the cutter head compartment and a diving decompression meter; after pressurization is finished, a welder enters the air cushion cabin 5-6 through the air cushion cabin door 5-4 of the shield tunneling machine 5, then enters the repair working space 6 through the cutter head cabin door 5-7, the welding gun 4 is operated to weld the cutter head 5-9 of the shield tunneling machine 5, and high-pressure air between a high-frequency high-voltage breakdown welding wire and the cutter head 5-9 provided by the high-pressure environment self-adaptive arc ignition system 1 is used for igniting electric arcs.
And after the welding maintenance operation is finished, the welder returns to the man compartment 5-3 of the shield machine 5 according to the reverse sequence, decompression is carried out on the man compartment 5-3 of the shield machine 5, the welder must carry an oxygen breathing mask and must close the cutter head compartment door 5-7 and the air cushion compartment door 5-4 before decompression is carried out, the decompression is carried out according to the pressure level of the cutter head compartment of the shield machine 5 and a diving decompression table, and after the decompression is finished, the welder goes out of the compartment through the man compartment door 5-2 of the shield machine 5.
In the welding method, the unique high-pressure environment self-adaptive arc ignition system 1 is adopted, and the high-frequency high pressure provided by the system can puncture the high-pressure air between the self-protection flux-cored wire 3 and the cutter heads 5-9 of the shield machine 5 to realize the ignition of the electric arc. The wire feeder 2 continuously feeds the self-shielded flux-cored wire 3 to the welding gun 4 for welding. The self-protection flux-cored wire 3 is decomposed to form welding pool protective gas in the welding process, and smoke generated in the welding process is sucked by a smoke suction machine 5-10 of the shield machine 5 and then discharged into a water seal tank 5-1 of the shield machine 5.
The pressurization and depressurization as described above are procedures that must be followed by a welder or other operator to perform a high-pressure cutterhead in-cabin maintenance operation. Pressurization is the pressure rise of the individual air-containing cavity from normal pressure (1 atmosphere) to working pressure, and depressurization is the pressure drop of the individual tissues from working pressure to normal pressure (1 atmosphere). The pressurization and decompression are carried out in a man compartment, the man compartment is a diving decompression compartment (or called a pressurization compartment) for the shield machine, is a special pressure-resistant container, and can be used for pressurization and decompression of operators by injecting compressed air to form a high-pressure environment. Before operation, an operator pressurizes in the cabin, and the purpose of pressurization is to enable the operator to balance the air pressure of an air-containing cavity communicated with the outside in the human body. After the operation, the operator depressurizes the cabin to discharge the gas in the operator and restore the normal life.
When the operator breathes air at high pressure, the inert gas (primarily nitrogen) diffuses into the body tissues and the total nitrogen intake increases with increasing pressure levels and duration. When decompressing, in order to prevent the diffusion rate of nitrogen from being too fast, the pressure difference gradient between each tissue of the body and the nitrogen partial pressure of the circulation system and the respiratory system (blood and lung) must be carefully controlled, otherwise the tissue and blood can form nitrogen bubbles to cause decompression sickness. In order to prevent the occurrence of decompression sickness, relevant departments set special decompression tables, namely diving decompression tables, which are special tables considering the pressure level, the total amount of nitrogen gas taken in during the operation time, the allowable pressure difference gradient which does not cause the formation of a large amount of bubbles, the nitrogen discharge rate of body tissues and other factors.
The pressurization and the decompression are required to be performed according to relevant regulations, and the gradual increase or decrease is required, particularly the decompression is required to be strictly performed according to the provisions of a diving decompression table.
When the cutter head of the shield machine is welded and maintained, the adopted high-pressure environment welding parameters comprise parameters such as welding current, welding voltage, wire feeding speed and the like which are matched with the environment gas pressure, and the parameters are determined through a pre-performed high-pressure environment welding process test.
The determination of the welding parameters in the high-pressure environment needs to be determined through a welding process test, the welding process test is carried out in a pressure-resistant container, and the welding process can be executed by adopting an automatic welding mechanism. Compared with the normal pressure (1 atmosphere) common environment welding process test, the high-pressure welding process test adopts the same automatic welding mechanism and welding materials, the main parameters to be determined are the same, namely welding current, welding voltage, wire feeding speed and the like, and the only difference is that the environment pressure is different. A welding process test is firstly carried out under normal pressure, and main welding parameters which can carry out stable welding and meet the requirements on the quality and the efficiency of welding seams are obtained. And then, carrying out a welding process test under high air pressure, wherein the test target is to obtain main welding parameters which can carry out stable welding and meet the requirements on the quality and the efficiency of welding seams. However, in the welding under high pressure, the problems of difficult arc striking, unstable welding process, low welding efficiency, poor mechanical property of welding seams and the like need to be solved, and the welding parameters under normal pressure cannot be used in the high pressure environment and need to be adjusted. In addition, the welding parameters in the high-pressure environment need to be adapted to the pressure level, and the requirement of the relevant standard is that when the pressure change exceeds 0.1MPa (which is equivalent to 10m water depth), the welding parameters need to be evaluated again.
Claims (8)
1. A shield tunneling machine cutter head cutter welding method under a high-pressure environment is characterized in that a shield tunneling machine (5) comprises a human cabin (5-3), an air cushion cabin (5-6) and a cutter head cabin, wherein the human cabin (5-3) is provided with a human cabin door (5-2), the air cushion cabin (5-6) is provided with an air cushion cabin door (5-4) and an air cushion cabin flange (5-5), the cutter head cabin is provided with a cutter head cabin door (5-7) and a cutter head cabin flange (5-8), and a cutter head (5-9) is located in the cutter head cabin; the method is characterized by comprising the following steps:
(1) constructing a stratum consolidation area and establishing a repair working space
Firstly, reinforcing the stratum around a cutter head (5-9) of a shield machine (5) to form a stratum reinforcing area (5-11) required by maintenance operation, protecting the tunnel face of the stratum reinforcing area (5-11) by a mud film to form a repair working space (6), then filling compressed air into the repair working space (6) to balance the pressure of stratum muddy water, and arranging an air pressure sensor (14) in the repair working space (6) for measuring the pressure of environmental gas in the repair working space (6);
(2) preparation before welding
Before welding maintenance operation, a wire feeder (2) and a welding gun (4) are arranged in a repair working space (6), and then the anode and the cathode of a welding cable of the high-pressure environment self-adaptive arc ignition system (1) sequentially penetrate through an air cushion cabin flange (5-5) and a cutter head cabin flange (5-8) of a shield machine (5) and are respectively connected with a wire feeder (2) and a cutter head (5-9) of the shield machine (5) to form a welding loop;
(3) welding maintenance
During welding maintenance operation, a welder enters a man-machine compartment (5-3) of the shield machine (5) through a man-machine compartment door (5-2) of the shield machine (5), the man-machine compartment (5-3) is pressurized to be equal to the given pressure during tunneling of the shield machine (5), and pressurization is carried out according to the pressure level of the cutter head compartment and a diving decompression meter; after pressurization is finished, a welder enters an air cushion cabin (5-6) through an air cushion cabin door (5-4) of a shield machine (5), then enters a repair working space (6) through a cutter head cabin door (5-7), a welding gun (4) is operated to weld a cutter head (5-9) of the shield machine (5), the high-pressure environment self-adaptive arc striking system (1) provides corresponding high-frequency high pressure in a self-adaptive mode according to the pressure of environment gas in the repair working space (6), the high-frequency high pressure breaks through high-pressure air between the welding gun (4) and the cutter head (5-9), and electric arcs are ignited;
and after the welding maintenance operation is finished, the welder returns to the man compartment (5-3) of the shield machine (5) according to the reverse sequence, decompression is carried out on the man compartment (5-3) of the shield machine (5), before the decompression is carried out, the welder must carry an oxygen breathing mask and must close the cutter compartment door (5-7) and the air cushion compartment door (5-4), the decompression is carried out according to the pressure level of the cutter compartment and a diving decompression meter, and after the decompression is finished, the welder goes out of the compartment through the man compartment door (5-2) of the shield machine (5).
2. The method for welding the cutter of the shield machine cutter head in the high-pressure environment according to claim 1, characterized in that: the high-pressure environment self-adaptive arc ignition system (1) comprises a high-frequency oscillator (11), a linear sliding table (12), a control unit (13), an air pressure sensor (14) and a welding power supply loop (15), wherein the high-frequency oscillator (11) is provided with a primary high-voltage transformer (T1) and a secondary high-frequency coupling transformer (T2), a secondary coil (L2) of the linear sliding table (12) and the secondary high-frequency coupling transformer (T2) is in slidable contact, the control unit (13) is electrically connected with the linear sliding table (12) and the air pressure sensor (14), the high-frequency oscillator (11) is connected into the welding power supply loop (15) in series, an environment gas pressure signal measured by the air pressure sensor (14) is transmitted to the control unit (13), and the control unit (13) analyzes and calculates the pressure signal and drives the linear sliding table (12) to linearly move a corresponding moving distance, and obtaining high-frequency high voltage corresponding to the ambient gas pressure, and applying the high-frequency high voltage between the welding gun (4) and the cutter heads (5-9) by a welding power supply circuit (15).
3. The method for welding the cutter of the shield machine cutter head in the high-pressure environment according to claim 2, characterized in that: the secondary side of the primary high-voltage transformer (T1) is connected in parallel with a spark gap arrester (P), after the secondary side of the primary high-voltage transformer (T1) is connected in series with an oscillating capacitor (C), the secondary side of the primary high-voltage transformer is connected to the primary side of the secondary high-frequency coupling transformer (T2), and the secondary side of the secondary high-frequency coupling transformer (T2) is connected in series to the welding power supply loop (15).
4. The shield tunneling machine cutter head and cutter welding method under the high-pressure environment according to claim 2 or 3, characterized in that: the secondary coil (L2) of the secondary high-frequency coupling transformer (T2) is a sliding coil, a sliding block is arranged on the linear sliding table (12), a moving sliding sheet is connected on the sliding block, so that the moving sliding sheet can be in slidable contact with the secondary coil (L2), and the output voltage of the secondary coil (L2) can be adaptively changed to adapt to the arc striking requirement along with the sliding of the moving sliding sheet on the secondary coil (L2).
5. The method for welding the cutter of the shield machine cutter head in the high-pressure environment according to any one of claims 2 to 4, wherein: the control unit (13) comprises a computer, a data acquisition card, a driver, a small servo motor and a reducer, wherein the data acquisition card is arranged on a computer mainboard, and the driver is connected with a serial port of the computer; the control unit (13) drives the linear sliding table (12) to move through a driver, a small servo motor and a speed reducer.
6. The method for welding the cutter of the shield machine cutter head in the high-pressure environment according to any one of claims 1 to 5, wherein: in the step (2), a smoking machine (5-10) is arranged right above a welding gun (4) in the repair working space (6), and the smoking machine (5-10) is connected to a water seal tank (5-1) outside the shield machine (5) through an exhaust pipeline; in the welding maintenance process in the step (3), the welding wire is decomposed to form welding pool protective gas, and the generated smoke is sucked by a smoking machine (5-10) and then discharged into a water seal tank (5-1).
7. The method for welding the cutter of the shield machine cutter head in the high-pressure environment according to any one of claims 1 to 6, wherein: the welding wire adopted by the welding gun (4) is a self-protection flux-cored wire (3).
8. The method for welding the cutter of the shield machine cutter head in the high-pressure environment according to any one of claims 1 to 7, wherein: the high-pressure environment welding parameters adopted by the method comprise welding current, welding voltage and wire feeding speed matched with the environment gas pressure, and the parameters are determined through pre-performed high-pressure environment welding process tests.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010094128.4A CN111250819B (en) | 2020-02-15 | 2020-02-15 | Method for welding cutter head and cutter of shield machine in high-pressure environment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010094128.4A CN111250819B (en) | 2020-02-15 | 2020-02-15 | Method for welding cutter head and cutter of shield machine in high-pressure environment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111250819A true CN111250819A (en) | 2020-06-09 |
| CN111250819B CN111250819B (en) | 2021-08-13 |
Family
ID=70944326
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010094128.4A Active CN111250819B (en) | 2020-02-15 | 2020-02-15 | Method for welding cutter head and cutter of shield machine in high-pressure environment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111250819B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2179227Y (en) * | 1993-09-06 | 1994-10-12 | 徐世荣 | High frequency electric spark generator |
| CN2276391Y (en) * | 1996-11-19 | 1998-03-18 | 华南理工大学 | High-frequency arc striking apparatus used with contravariant welder |
| JP2001040987A (en) * | 1999-07-28 | 2001-02-13 | Nkk Corp | Propulsion pipe joint structure and method for joining the same by welding |
| CN103061776A (en) * | 2013-01-06 | 2013-04-24 | 中铁隧道集团有限公司 | Method for repairing TBM (tunnel boring machine) cutter head in intra-tunnel high-pressure environment |
| CN104827161A (en) * | 2014-02-12 | 2015-08-12 | 北海潜水员有限责任公司 | Hyperbar electric arc welding apparatus |
| CN204924687U (en) * | 2015-08-24 | 2015-12-30 | 中交一航局第一工程有限公司 | Shield constructs quick -witted high -pressure welding jobs equipment pressurization testing arrangement |
| CN106513934A (en) * | 2016-12-29 | 2017-03-22 | 浙江联洋机电科技有限公司 | High-frequency high-voltage arc ignition circuit |
| CN108422068A (en) * | 2018-03-13 | 2018-08-21 | 中铁隧道局集团有限公司 | TBM cutterhead scraper plate method for maintaining |
| CN108817839A (en) * | 2018-05-31 | 2018-11-16 | 中建八局轨道交通建设有限公司 | Cutter head of shield machine panel part repair structure and restorative procedure |
| CN110671121A (en) * | 2019-09-23 | 2020-01-10 | 中铁工程服务有限公司 | Disassembly structure, disassembly method and repair method of shield machine |
-
2020
- 2020-02-15 CN CN202010094128.4A patent/CN111250819B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2179227Y (en) * | 1993-09-06 | 1994-10-12 | 徐世荣 | High frequency electric spark generator |
| CN2276391Y (en) * | 1996-11-19 | 1998-03-18 | 华南理工大学 | High-frequency arc striking apparatus used with contravariant welder |
| JP2001040987A (en) * | 1999-07-28 | 2001-02-13 | Nkk Corp | Propulsion pipe joint structure and method for joining the same by welding |
| CN103061776A (en) * | 2013-01-06 | 2013-04-24 | 中铁隧道集团有限公司 | Method for repairing TBM (tunnel boring machine) cutter head in intra-tunnel high-pressure environment |
| CN104827161A (en) * | 2014-02-12 | 2015-08-12 | 北海潜水员有限责任公司 | Hyperbar electric arc welding apparatus |
| CN204924687U (en) * | 2015-08-24 | 2015-12-30 | 中交一航局第一工程有限公司 | Shield constructs quick -witted high -pressure welding jobs equipment pressurization testing arrangement |
| CN106513934A (en) * | 2016-12-29 | 2017-03-22 | 浙江联洋机电科技有限公司 | High-frequency high-voltage arc ignition circuit |
| CN108422068A (en) * | 2018-03-13 | 2018-08-21 | 中铁隧道局集团有限公司 | TBM cutterhead scraper plate method for maintaining |
| CN108817839A (en) * | 2018-05-31 | 2018-11-16 | 中建八局轨道交通建设有限公司 | Cutter head of shield machine panel part repair structure and restorative procedure |
| CN110671121A (en) * | 2019-09-23 | 2020-01-10 | 中铁工程服务有限公司 | Disassembly structure, disassembly method and repair method of shield machine |
Non-Patent Citations (1)
| Title |
|---|
| 徐学东: "《材料成型过程控制原理及应用》", 29 February 2016, 武汉大学出版社 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111250819B (en) | 2021-08-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111250819B (en) | Method for welding cutter head and cutter of shield machine in high-pressure environment | |
| CN102528217B (en) | Automatic straight seam welding machine | |
| CN104227188B (en) | Arc-welding apparatus, arc welding system and arc-welding method | |
| CA2435863A1 (en) | Method and apparatus for controlling a welding system | |
| GB1188024A (en) | Improvements in or relating to Arc Welding Processes and Apparatus. | |
| US11648622B2 (en) | Method of operating a welding power supply and a welding power supply | |
| CN207414551U (en) | A kind of people's air defense door leaf door frame welding machine | |
| CA2082732A1 (en) | Methods and apparatus for supplying gas under high pressure to weldable air bag vessels with a gas passage formed therein, and like products, and then weld-sealing the passage | |
| US7638734B2 (en) | Method and circuit for contactless ignition of a welding arc with high frequency ignition pulse packets | |
| CA2940201A1 (en) | Method and apparatus for gas metal arc welding | |
| CN103264208B (en) | Method for synchronously welding internal groove and external groove of nuclear island main device loop weld | |
| CN111299756B (en) | High-pressure environment self-adaptive arc striking system | |
| CN103506748B (en) | Plasma-arc welding system and plasma-arc welding method | |
| CN102126067A (en) | Arc initiating device of TIG and plasma cutter | |
| CN203045133U (en) | Welding machine for ejector rod with iron core | |
| JP3996737B2 (en) | Spot welding apparatus and spot welding method | |
| DE60136615D1 (en) | DEVICE FOR ARC FLASHING UNDER PROTECTIVE GAS | |
| DE2505665A1 (en) | Atmospheric pollution free plasma torch cutting - is carried out just under surface of a water bath | |
| US3678241A (en) | Inert atmosphere tack welder | |
| US2683433A (en) | Welding jig for car sides | |
| US3067320A (en) | Method for joining tantalum sheets | |
| DE3342932C2 (en) | ||
| CN2873249Y (en) | Pulse wave CO2 laser therapeutic machine | |
| CN108857008A (en) | A kind of Steel tube packaging band automatic soldering device | |
| CN205660281U (en) | Welding equipment with soldering joint tracking function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |