Shield tunneling machine starting section reaction frame welding device

Abstract

The invention discloses a shield tunneling machine starting section reaction frame welding device, and relates to the technical field of reaction frame welding. Comprising a welding limiting piece; a welding part is mounted on the welding limiting piece and is used for synchronously welding inclined struts on the two sides; a verification mounting piece is mounted on the welding limiting piece; the checking mounting piece is used for improving the welding precision of the reaction frame; the verification installation member is provided with a bidirectional contact member. The two-way attaching contact piece is used for being attached to a counter-force frame vertical plate. Two adjusting pieces are mounted on the welding limiting piece; the two adjusting pieces are used for adjusting the bottom end of the inclined strut; the problem that according to an existing shield tunneling machine starting section reaction frame welding device, double-station simultaneous welding forming of workers is inconvenient is solved. The adopted welding gun switch can be used for limiting the welding guns on the two welding gun frames to conduct welding work at the same time in the actual welding process, and it is guaranteed that double-station synchronous welding is conducted in the actual welding process.

Description

Technical Field

[0001] The invention relates to the technical field of reaction frame welding, in particular to a reaction frame welding device for a starting section of a shield machine. Background Art

[0002] As a large-scale drilling and mobile equipment, the shield machine needs to be stopped by a special reaction frame when it moves forward in the starting section. The welding accuracy of the reaction frame directly affects the drilling quality of the shield machine. The reaction frame is usually welded by two base plates, vertical plates and diagonal braces. The diagonal braces use the "triangular stability principle" to decompose the axial thrust of the shield jack into vertical and horizontal components and transmit them to the foundation pit structure. The diagonal braces usually need to be welded and positioned before they are fully welded. The current welding device for the reaction frame of the starting section of the shield machine is not convenient for workers to weld and form at two stations at the same time, especially for positioning welding work. The separate welding method is likely to affect the consistency of cooling shrinkage, affecting welding accuracy and weld safety. It is also not easy to control welding accuracy, and manual measurement is cumbersome.

[0003] Therefore, a shield machine starting section reaction frame welding device is proposed. Summary of the Invention

[0004] The purpose of the present invention is to provide a shield machine starting section reaction frame welding device to solve the problem raised in the above background technology that the current shield machine starting section reaction frame welding device is not convenient for workers to weld and form at two stations at the same time.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: A shield machine starting section reaction frame welding device, comprising a welding limiter; a welding portion is installed on the welding limiter, and the welding portion is used for synchronously welding diagonal braces on both sides; a verification mounting member is installed on the welding limiter; the verification mounting member is used to improve the welding accuracy of the reaction frame; a two-way contact member is installed on the verification mounting member; the two-way contact member is used to be attached to the vertical plate of the reaction frame; two adjustment members are installed on the welding limiter; the two adjustment members are used to adjust the bottom end of the diagonal brace; the welding limiter comprises: a welding connecting rod and an angle block, and angle blocks are fixedly installed at both ends of the welding connecting rod; the two angle blocks are respectively used to fit between the vertical plate and the bottom plate of the reaction frame.

[0006] Preferably, the welding limiter also includes: an angle electromagnet and an in-position switch. The two angle blocks are respectively fixedly embedded with an angle electromagnet, and the upper two angle electromagnets are used to magnetically attract the vertical plates of the reaction frame, and the lower two angle electromagnets are used to magnetically attract the bottom plate of the reaction frame; two in-position switches are respectively fixedly embedded with the sides of the two angle blocks, and the four in-position switches are respectively used to fit the vertical plates of the reaction frame and the sides of the bottom plate.

[0007] Preferably, the welding part comprises: swing limiting ropes and distance limiting ropes, two swing limiting ropes are fixedly installed on the welding link; two distance limiting ropes are fixedly installed at the ends of the two swing limiting ropes; the length of the distance limiting rope is less than the diagonal distance of the diagonal bracing of the counterforce frame; the swing limiting rope is used to limit the movement range of the two ends of the distance limiting rope.

[0008] Preferably, the welding part further comprises: welding gun holders and welding gun switches, the two ends of the distance limiting rope are respectively fixedly installed with welding gun holders; two welding guns are respectively installed on the two welding gun holders; two welding gun switches are respectively fixedly installed on the two welding gun holders; the two welding gun switches are connected in series with the welding guns on the welding gun holders; the welding guns on the two welding gun holders are started when the two welding gun switches are pressed at the same time; the two welding guns on the two welding gun holders are used for synchronous welding positioning of the diagonal bracing of the counterforce frame.

[0009] Preferably, the check mounting part comprises: a check mounting plate and check switches, the check mounting plate is fixedly installed on the welding link; the check mounting plate is in T-shaped structure; three check switches are respectively fixedly embedded on the two sides of the check mounting plate; the check switches and the welding machines connected with the welding guns on the two welding gun holders are electrically connected; the check mounting plate is located on the side of the vertical plate of the counterforce frame.

[0010] Preferably, the bidirectional sticking part comprises: a sliding shaft and extrusion plates, the sliding shaft is fixedly installed on the check mounting plate; the sliding shaft is in rectangular column structure; two extrusion plates are fixedly installed on the sliding shaft, and the two extrusion plates are respectively located on the two sides of the check mounting plate; the two extrusion plates are respectively aligned with the check switches on the same side; the extrusion plate is in steel sheet bending structure; the end of the sliding shaft is in conical structure.

[0011] Preferably, the bidirectional sticking part further comprises: a sticking spring, the sticking spring is sleeved on the sliding shaft and connected between the sliding shaft and the check mounting plate; the sticking spring is used to push the sliding shaft to stick to the vertical plate of the counterforce frame.

[0012] Preferably, the adjusting part comprises: a threaded cylinder and a fixed mounting block, the threaded cylinder is fixedly installed on the angle block; the inner side of the threaded cylinder is provided with threads; the fixed mounting block is fixedly installed on the threaded cylinder; the fixed mounting block is provided with a socket; a bolt is inserted into the socket of the fixed mounting block, and the bolt inserted into the fixed mounting block is used for threaded connection with the bottom plate of the counterforce frame.

[0013] Preferably, the adjusting part further comprises: an adjusting lead screw and a limiting clamping block, the adjusting lead screw is threadedly connected to the threaded cylinder; the adjusting lead screw is provided with a hexagonal column; the limiting clamping block is rotatably installed on the adjusting lead screw; the limiting clamping block is in inclined surface structure; the inclined surface of the limiting clamping block is used to stick to the diagonal bracing of the counterforce frame.

[0014] Preferably, the adjusting part further includes: a positioning bolt, two limiting clamping blocks are threadedly connected to the limiting clamping block; the ends of the two limiting clamping blocks are respectively conical structures; the two positioning bolts are respectively used to clamp and fit the edges of the diagonal braces of the reaction frame.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention adopts a welding part that can cooperate with the welding limit piece to ensure that the installation position of the welding limit piece is guaranteed when welding is actually required, and ensures that the swing limit rope and the distance limit rope can be used to limit the spacing and the range of movement of the two welding gun racks in the future, and ensures that during the actual welding positioning, the two welding gun racks can only weld the upper end or the lower end of the diagonal support at the same time, and cannot cross or weld the upper and lower ends of the diagonal support on one side at the same time, ensuring that the bottom ends of the two diagonal supports can be welded and positioned subsequently, and the welding gun switch used can be used to limit the welding guns on the two welding gun racks to perform welding work at the same time during actual welding, ensuring that during actual welding, the double-station welding is synchronized, and the cooling and shrinkage of the weld after welding is also synchronized, reducing welding errors and ensuring welding quality.

[0016] The use of two-way contact pieces can facilitate the detection of the verticality of the reaction frame vertical plate when welding the positioning diagonal brace, which can make it easier for the staff to make timely adjustments. At the same time, once there is a problem of excessive accuracy deviation, the staff cannot continue the welding operation, which can further improve the welding accuracy of the staff. The detection of this structure is more direct and can reduce the difficulty of measurement. Once the displacement exceeds the standard, the sliding shaft will drive the extrusion plate to extrude the verification switch, which will control the power off of the welding gun on the welding gun stand, and timely adjustments are required.

[0017] The use of adjustment parts can assist in the displacement adjustment of the diagonal brace of the reaction frame when the bottom end of the diagonal brace is welded and positioned, which can make it easier for workers to adjust the position of the diagonal brace with less effort, and ensure that the vertical plate of the reaction frame can remain vertical after the bottom end of the diagonal brace is welded. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall structure of a shield machine starting section reaction frame welding device of the present invention; Figure 2 This is a schematic diagram of a shield machine starting section reaction frame welding device installed behind the reaction frame of the present invention; Figure 3 This is a schematic structural diagram of the welding portion of the present invention; Figure 4 This is a schematic structural diagram of a welding limiter according to the present invention; Figure 5 For the present invention Figure 1 A magnified view of the structure of the middle A area; Figure 6 This is a schematic diagram of the structure of the calibration mounting member of the present invention; Figure 7 For the present invention Figure 6 A magnified view of the structure of the middle B region; Figure 8 This is a cross-sectional view of the installation position of the verification switch of the present invention; Figure 9 This is a schematic diagram of the structure of the adjusting member of the present invention; Figure 10 This is a schematic diagram of the installation position of the positioning bolt of the present invention.

[0019] In the figure: 1. Welding limiter; 101. Welding connecting rod; 1011. Angle block; 102. Angle electromagnet; 103. In-position switch; 2. Welding part; 201. Swing limit rope; 202. Distance limit rope; 203. Welding gun holder; 204. Welding gun switch; 3. Verification mounting part; 301. Verification mounting plate; 302. Verification switch; 4. Bidirectional contact part; 401. Sliding shaft; 402. Extrusion plate; 403. Fitting spring; 5. Adjustment part; 501. Threaded barrel; 502. Fixed mounting block; 503. Adjustment screw; 504. Limit clamping block; 505. Positioning bolt. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] Example 1: Please refer to Figures 1 to 10 As shown: The present invention provides a technical solution: a shield machine starting section reaction frame welding device, including a welding limiter 1; a welding part 2 is installed on the welding limiter 1, and the welding part 2 is used for synchronously welding diagonal braces on both sides; a verification mounting part 3 is installed on the welding limiter 1; the verification mounting part 3 is used to improve the welding accuracy of the reaction frame; a two-way contact part 4 is installed on the verification mounting part 3; the two-way contact part 4 is used to be attached to the vertical plate of the reaction frame; two adjustment parts 5 are installed on the welding limiter 1; the two adjustment parts 5 are used to adjust the bottom end of the diagonal brace; the welding limiter 1 includes: a welding connecting rod 101 and an angle block 1011, and the two ends of the welding connecting rod 101 are respectively fixed with angle blocks 1011; the two angle blocks 1011 are respectively used to fit between the vertical plate and the bottom plate of the reaction frame.

[0022] Among them, the welding limiter 1 also includes: an angle electromagnet 102 and an in-position switch 103. The two angle blocks 1011 are respectively fixedly embedded with angle electromagnets 102, and the upper two angle electromagnets 102 are used to magnetically attract the vertical plates of the reaction frame, and the lower two angle electromagnets 102 are used to magnetically attract the bottom plate of the reaction frame; two in-position switches 103 are respectively fixedly embedded on the sides of the two angle blocks 1011, and the four in-position switches 103 are respectively used to fit the vertical plates and the sides of the bottom plate of the reaction frame; the welding part 2 includes: a swing limiting rope 201 and a distance limiting rope 202. Two swing limiting ropes 201 are fixedly installed on the welding connecting rod 101; the ends of the two swing limiting ropes 201 are fixedly installed with a distance limiting rope 202; the length of the distance limiting rope 202 is less than the two reaction frame diagonal braces Diagonal spacing; the swing limiting rope 201 is used to limit the range of movement of the two ends of the distance limit rope 202; the welding part 2 also includes: a welding gun rack 203 and a welding gun switch 204, and the two ends of the distance limit rope 202 are fixedly installed with a welding gun rack 203; the two welding gun racks 203 are respectively installed with welding guns; the two welding gun racks 203 are respectively fixedly installed with welding gun switches 204; the two welding gun switches 204 are connected in series with the welding guns on the welding gun rack 203; when the two welding gun switches 204 are pressed at the same time, the welding guns on the welding gun rack 203 are started; the welding guns on the two welding gun racks 203 are used for double-station synchronous welding positioning reaction frame diagonal bracing, and the welding part 2 can be used to cooperate with the welding limiter 1 to ensure that when welding is actually required, the installation position of the welding limiter 1 is guaranteed, and the subsequent use of the swing The dynamic limiting rope 201 and the distance limiting rope 202 can limit the spacing and movable range of the two welding gun holders 203, ensuring that during actual welding positioning, the two welding gun holders 203 can only weld the upper end or the lower end of the diagonal brace at the same time, and cannot cross or weld the upper and lower ends of the diagonal brace on one side at the same time, so as to avoid that when the upper and lower ends of the diagonal brace on one side are completely welded, once the diagonal brace on the other side needs further correction and adjustment, it will cause interference to the already welded diagonal brace, ensuring that the bottom ends of the two diagonal braces can be welded and positioned later. At the same time, the welding gun switch 204 used can be used to limit the welding guns on the two welding gun holders 203 to weld at the same time during actual welding, ensuring that during actual welding, the double-station welding is synchronized, and the cooling and shrinkage of the weld after welding is also synchronized, reducing welding errors. Poor, to ensure welding quality, local high temperature during welding causes metal expansion, and residual stress is generated by shrinkage after cooling, and single-sided welding is easy to cause deformation. At the same time, the welding positioning process is more in line with actual specification requirements, and the two corner blocks 1011 are respectively attached to the vertical plate and the bottom plate of the reaction frame. At this time, when the four in-place switches 103 are squeezed respectively, the two welders can hold the welding gun holder 203 respectively and press the two welding gun switches 204 at the same time. The welding guns on the welding gun holder 203 are used to perform positioning welding on the upper ends of the two diagonal braces respectively, and weld synchronously. The welding guns on the two welding gun holders 203 produce welding wire at the same time. Once the staff fails to weld synchronously, the welding wire of the welding guns that does not fit the weld seam will be discharged in large quantities and wasted, thereby limiting the staff's synchronous welding operation.

[0023] Among them, the verification mounting part 3 includes: a verification mounting plate 301 and a verification switch 302, the verification mounting plate 301 is fixedly mounted on the welding connecting rod 101; the verification mounting plate 301 is a T-shaped structure; three verification switches 302 are fixedly embedded on both sides of the verification mounting plate 301; the verification switch 302 and the in-place switch 103 are electrically connected to the welding machine external to the welding gun on the two welding gun racks 203; the verification mounting plate 301 is located on the side of the reaction frame vertical plate; the two-way contact part 4 includes: a sliding shaft 401 and an extrusion plate 402, the verification mounting plate 301 A sliding shaft 401 is fixedly installed on the upper surface; the sliding shaft 401 is a rectangular column structure; two extrusion plates 402 are fixedly installed on the sliding shaft 401, and the two extrusion plates 402 are respectively located on both sides of the verification installation plate 301; the two extrusion plates 402 are respectively aligned with the verification switch 302 on the same side; the extrusion plates 402 are a bent steel sheet structure; the end of the sliding shaft 401 is a conical structure; the bidirectional contact member 4 also includes: a fitting spring 403, a fitting spring 403 is sleeved on the sliding shaft 401, and the fitting spring 403 is connected between the sliding shaft 401 and the verification installation plate 301 The fitting spring 403 is used to push the sliding shaft 401 against the vertical plate of the reaction frame; the use of a two-way contact member 4 can facilitate the detection of the verticality of the vertical plate of the reaction frame when welding the positioning diagonal brace, which can make it easier for the staff to make timely adjustments. At the same time, once there is a problem of excessive accuracy deviation, the staff cannot continue the welding operation, which can further improve the welding accuracy of the staff. The structure detection is more direct, which can reduce the measurement difficulty and avoid excessive tilt due to the pushing of the diagonal brace or the pulling of the diagonal brace under its own weight when welding the diagonal brace. The detection is direct and improves The welding quality of the reaction frame. Once the vertical plate of the reaction frame is pulled or pushed to cause a large tilt deviation, the bottom of the vertical plate of the reaction frame is welded to the bottom plate of the reaction frame, and the upper part and the welding point of the diagonal support will be displaced to the left or right. The fitting spring 403 pushes the sliding shaft 401 against the vertical plate of the reaction frame. Once the displacement exceeds the standard, the sliding shaft 401 will drive the extrusion plate 402 to squeeze the verification switch 302, which will control the power off of the welding gun on the welding gun holder 203. Timely adjustment is required to avoid the problem of difficulty in adjusting the vertical plate of the reaction frame after the bottom end of the diagonal support is welded and positioned.

[0024] Example 2, on the basis of Example 1, the adjusting member 5 includes: a threaded barrel 501 and a fixed mounting block 502, the threaded barrel 501 is fixedly mounted on the corner block 1011; the inner side of the threaded barrel 501 is provided with a thread; the threaded barrel 501 is fixedly mounted with a fixed mounting block 502; the fixed mounting block 502 is provided with a socket; a bolt is inserted into the socket on the fixed mounting block 502, and the bolt inserted on the fixed mounting block 502 is used to threadedly connect the reaction frame base plate; the adjusting member 5 also includes: an adjusting screw rod 503 and a limit clamping block 504, the threaded barrel 501 is threadedly connected with an adjusting screw rod 503; the adjusting screw rod 503 is provided with a hexagonal column; the adjusting screw rod 503 is rotated The limit clamping block 504 is dynamically installed; the limit clamping block 504 is a sloped structure; the slope of the limit clamping block 504 is used to fit the diagonal brace of the reaction frame; the adjustment part 5 also includes: a positioning bolt 505, and two limit clamping blocks 504 are threadedly connected to the limit clamping block 504; the ends of the two limit clamping blocks 504 are respectively conical structures; the two positioning bolts 505 are respectively used to clamp and fit the edges of the diagonal brace of the reaction frame. The use of the adjustment part 5 can assist in the displacement adjustment of the diagonal brace when the bottom end of the diagonal brace of the reaction frame is welded and positioned, which can make it more convenient for the staff to adjust the position of the diagonal brace with less effort. After the bottom end of the diagonal brace is welded, the vertical plate of the reaction frame can still remain vertical, and the adjustment is simple and fast.

[0025] The working principle of the embodiment is as follows: first, when actual welding is needed, two corner blocks 1011 can be attached to the vertical plate and the bottom plate of the counterforce frame respectively, the protruding structures on the side surfaces of the two corner blocks 1011 can be attached to the two sides of the vertical plate of the counterforce frame, the two inclined braces are respectively arranged in the limiting clamping block 504, the bolt inserted on the fixed mounting block 502 is used for threadedly connecting the bottom plate of the counterforce frame, the two upper corner electromagnets 102 are used for magnetically attracting the vertical plate of the counterforce frame, and the two lower corner electromagnets 102 are used for magnetically attracting the bottom plate of the counterforce frame. At this time, the four in-place switches 103 are pressed, and two welders can hold the welding gun holder 203 at the same time, press the two welding gun switches 204, and perform positioning welding on the upper ends of the two inclined braces through the welding guns on the welding gun holder 203. The two welding guns on the welding gun holder 203 simultaneously feed welding wires. If the workers fail to synchronously weld, the welding wires of the welding gun that is not attached to the weld will be discharged in large quantities, so as to limit the synchronous operation of the workers. The length of the swing limiting rope 201 and the distance limiting rope 202 is set according to the size of the counterforce frame. When the two inclined braces are synchronously welded, the length of the distance limiting rope 202 is insufficient, and when the two ends of one inclined brace are welded, the swing limiting rope 201 far away will be restricted and cannot be completed. Therefore, the upper ends of the two inclined braces are welded and positioned first, and then the lower ends are welded and positioned. The inclined brace is clamped through the rotating positioning bolt 505. The tapered structure on the end of the positioning bolt 505 is used to press the I-beam of the inclined brace to clamp it. When the bottom of the inclined brace needs to be adjusted, the hexagonal column on the adjusting screw 503 is adjusted through a wrench, the adjusting screw 503 is adjusted in extension and retraction, the displacement of the limiting clamping block 504 is controlled, the position of the bottom of the inclined brace is finely adjusted, and then the workers weld the bottom of the inclined brace through the welding guns on the two welding gun holders 203. After the welding and positioning are completed, the workers can perform fine welding such as full welding. When the upper end of the inclined brace is welded, if the counterforce frame vertical plate is pulled or pushed to cause a large inclination deviation, the counterforce frame vertical plate bottom and the counterforce frame bottom plate are welded, and the upper and inclined brace welding positions will be displaced to the left or right. The slide shaft 401 is attached to the counterforce frame vertical plate through the spring 403. If the displacement exceeds the standard, the slide shaft 401 will drive the extrusion plate 402 in the opposite direction to extrude the check switch 302. The check installation plate 301 is provided with check switches 302 on both sides, which can detect the left and right displacement of the counterforce frame. If a check switch 302 is extruded, the welding gun on the welding gun holder 203 will be powered off, and the workers need to adjust it in time.

[0026] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0027] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A shield machine starting section reaction frame welding device, comprising a welding limiter (1); a welding portion (2) is mounted on the welding limiter (1), characterized in that: The welding portion (2) is used for synchronously welding diagonal braces on both sides; a calibration mounting member (3) is installed on the welding limit member (1); the calibration mounting member (3) is used to improve the welding accuracy of the reaction frame; A bidirectional contact piece (4) is mounted on the calibration mounting piece (3); the bidirectional contact piece (4) is used to be attached to the vertical plate of the reaction frame; Two adjusting members (5) are installed on the welding limit member (1); the two adjusting members (5) are used to adjust the bottom end of the diagonal support; The welding limiter (1) comprises: a welding connecting rod (101) and an angle block (1011); the two ends of the welding connecting rod (101) are respectively fixedly mounted with an angle block (1011); the two angle blocks (1011) are respectively used to fit between the reaction frame vertical plate and the bottom plate.

2. A shield machine starting section reaction frame welding device according to claim 1, characterized in that: The welding limiter (1) further comprises: an angle electromagnet (102) and an in-position switch (103); the two angle blocks (1011) are respectively fixedly embedded with an angle electromagnet (102), and the two upper angle electromagnets (102) are used for magnetically attracting the vertical plate of the reaction frame, and the two lower angle electromagnets (102) are used for magnetically attracting the bottom plate of the reaction frame; two in-position switches (103) are respectively fixedly embedded on the sides of the two angle blocks (1011), and the four in-position switches (103) are respectively used for fitting the sides of the vertical plate of the reaction frame and the bottom plate; and protrusions are respectively provided on both sides of the two angle blocks (1011).

3. A shield machine starting section reaction frame welding device according to claim 2, characterized in that: The welding portion (2) comprises: a swing limiting rope (201) and a distance limiting rope (202); two swing limiting ropes (201) are fixedly mounted on the welding connecting rod (101); the distance limiting ropes (202) are fixedly mounted at the ends of the two swing limiting ropes (201); the length of the distance limiting ropes (202) is less than the diagonal spacing between the two reaction frame diagonal braces; and the swing limiting ropes (201) are used to limit the range of movement of the two ends of the distance limiting ropes (202).

4. A shield machine starting section reaction frame welding device according to claim 3, characterized in that: The welding part (2) further comprises: a welding gun rack (203) and a welding gun switch (204); the welding gun racks (203) are fixedly mounted on both ends of the distance limit rope (202); welding guns are respectively mounted on the two welding gun racks (203); welding gun switches (204) are respectively fixedly mounted on the two welding gun racks (203); the two welding gun switches (204) are connected in series to the welding guns on the welding gun racks (203); when the two welding gun switches (204) are pressed simultaneously, the welding guns on the welding gun racks (203) are started; the welding guns on the two welding gun racks (203) are used for double-station synchronous welding positioning reaction frame diagonal bracing.

5. A shield machine starting section reaction frame welding device according to claim 4, characterized in that: The calibration mounting member (3) comprises: a calibration mounting plate (301) and a calibration switch (302); the calibration mounting plate (301) is fixedly mounted on the welding connecting rod (101); the calibration mounting plate (301) is a T-shaped structure; three calibration switches (302) are fixedly embedded on both sides of the calibration mounting plate (301); the calibration switch (302) and the in-position switch (103) are electrically connected to the welding machine externally connected to the welding guns on the two welding gun racks (203); the calibration mounting plate (301) is located on the side of the reaction frame vertical plate.

6. A shield machine starting section reaction frame welding device according to claim 5, characterized in that: The bidirectional contact member (4) comprises: a sliding shaft (401) and an extrusion plate (402), wherein the sliding shaft (401) is fixedly mounted on the calibration mounting plate (301); the sliding shaft (401) is a rectangular column structure; two extrusion plates (402) are fixedly mounted on the sliding shaft (401), and the two extrusion plates (402) are respectively located on both sides of the calibration mounting plate (301); the two extrusion plates (402) are respectively aligned with the calibration switch (302) on the same side; the extrusion plates (402) are a bent steel sheet structure; and the end of the sliding shaft (401) is a tapered structure.

7. A shield machine starting section reaction frame welding device according to claim 6, characterized in that: The bidirectional contact member (4) further comprises: a contact spring (403), the contact spring (403) being sleeved on the sliding shaft (401), and the contact spring (403) being connected between the sliding shaft (401) and the calibration mounting plate (301); the contact spring (403) being used to push the sliding shaft (401) against the vertical plate of the reaction frame.

8. The shield machine starting section reaction frame welding device according to claim 1, characterized in that: The adjusting member (5) comprises: a threaded barrel (501) and a fixed mounting block (502); the threaded barrel (501) is fixedly mounted on the corner block (1011); a thread is provided on the inner side of the threaded barrel (501); a fixed mounting block (502) is fixedly mounted on the threaded barrel (501); a socket is provided on the fixed mounting block (502); a bolt is inserted into the socket on the fixed mounting block (502), and the bolt inserted on the fixed mounting block (502) is used for threaded connection to the reaction frame bottom plate.

9. A shield machine starting section reaction frame welding device according to claim 8, characterized in that: The adjusting member (5) further comprises: an adjusting screw (503) and a limiting clamping block (504); the threaded cylinder (501) is threadedly connected with the adjusting screw (503); a hexagonal column is provided on the adjusting screw (503); a limiting clamping block (504) is rotatably mounted on the adjusting screw (503); the limiting clamping block (504) is an inclined surface structure; the inclined surface of the limiting clamping block (504) is used to fit the diagonal support of the reaction frame.

10. A shield machine starting section reaction frame welding device according to claim 9, characterized in that: The adjusting member (5) further comprises: a positioning bolt (505); two positioning clamping blocks (504) are threadedly connected to the positioning clamping block (504); the ends of the two positioning clamping blocks (504) are respectively tapered structures; and the two positioning bolts (505) are respectively used for clamping and fitting the edges of the diagonal braces of the reaction frame.

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