A shield tunneling machine starting section counterforce frame welding device

Abstract

This invention discloses a welding device for the reaction frame of the starting section of a tunnel boring machine (TBM), relating to the field of reaction frame welding technology. It includes a welding limiting component; a welding part is installed on the welding limiting component, which is used for simultaneous double-sided welding of diagonal braces; a verification mounting component is installed on the welding limiting component; the verification mounting component is used to improve the welding accuracy of the reaction frame; a bidirectional contact component is installed on the verification mounting component; the bidirectional contact component is used to attach to the vertical plate of the reaction frame; two adjusting components are installed on the welding limiting component; the two adjusting components are used to adjust the bottom end of the diagonal braces. This addresses the problem that current TBM starting section reaction frame welding devices are inconvenient for workers to simultaneously weld at two workstations. The welding torch switch used can limit the welding torches on two welding torch holders to weld simultaneously during actual welding, ensuring synchronous welding at both workstations.

Description

Technical Field

[0001] This invention relates to the field of reaction frame welding technology, specifically to a reaction frame welding device for the starting section of a tunnel boring machine. Background Technology

[0002] As a large drilling and moving equipment, the tunnel boring machine (TBM) needs to be stopped by a special reaction frame when it advances in the starting section. The welding accuracy of the reaction frame directly affects the drilling quality of the TBM. The reaction frame is usually formed by welding two base plates, vertical plates and diagonal braces. The diagonal braces decompose the axial thrust of the TBM jack into vertical and horizontal components through the principle of triangular stability and transmit them to the foundation pit structure. Before the diagonal braces are fully welded, they usually need to be welded and positioned first. The current welding device for the reaction frame in the starting section of the TBM is not convenient for workers to weld at two positions at the same time. Especially for positioning welding work, welding separately can easily affect the consistency of cooling and shrinkage, affect the welding accuracy and weld safety, and is not convenient to control the welding accuracy. Manual measurement is cumbersome.

[0003] To address this, a welding device for the reaction frame of the tunnel boring machine's starting section is proposed. Summary of the Invention

[0004] The purpose of this invention is to provide a welding device for the reaction frame of the starting section of a tunnel boring machine, so as to solve the problem mentioned in the background art that the current welding device for the reaction frame of the starting section of a tunnel boring machine is not convenient for workers to weld simultaneously at two workstations.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a welding device for the reaction frame of a tunnel boring machine starting section, comprising a welding limiting component; a welding part is installed on the welding limiting component, the welding part being used for synchronous double-sided welding of diagonal braces; a verification mounting component is installed on the welding limiting component; the verification mounting component is used to improve the welding accuracy of the reaction frame; a bidirectional contact component is installed on the verification mounting component; the bidirectional contact component is used to attach to the vertical plate of the reaction frame; two adjusting components are installed on the welding limiting component; the two adjusting components are used to adjust the bottom end of the diagonal brace; the welding limiting component includes: a welding connecting rod and corner blocks, with corner blocks fixedly installed at both ends of the welding connecting rod; the two corner blocks are respectively used to attach between the vertical plate and the bottom plate of the reaction frame.

[0006] Preferably, the welding limiting component further includes: corner electromagnets and position switches. Corner electromagnets are fixedly embedded on the two corner blocks respectively, and the two upper corner electromagnets are used to magnetically attract the vertical plate of the reaction frame, and the two lower corner electromagnets are used to magnetically attract the bottom plate of the reaction frame. Two position switches are fixedly embedded on the sides of the two corner blocks respectively, and the four position switches are used to attach to the sides of the vertical plate of the reaction frame and the bottom plate respectively.

[0007] Preferably, the welding part includes: a swing limiting rope and a distance limiting rope, and two swing limiting ropes are fixedly installed on the welding connecting rod; a distance limiting rope is fixedly installed at the ends of the two swing limiting ropes; the length of the distance limiting rope is less than the diagonal distance between the two reaction frame diagonal braces; the swing limiting rope is used to limit the range of motion at both ends of the distance limiting rope.

[0008] Preferably, the welding section further includes: a welding torch holder and a welding torch switch; welding torch holders are fixedly installed at both ends of the distance rope; welding torches are installed on the two welding torch holders respectively; welding torch switches are fixedly installed on the two welding torch holders respectively; the two welding torch switches are connected in series with the welding torches on the welding torch holders; the welding torches on the welding torch holders are activated when the two welding torch switches are pressed simultaneously; the welding torches on the two welding torch holders are used for dual-station synchronous welding of the positioning reaction force frame diagonal brace.

[0009] Preferably, the verification mounting component includes: a verification mounting plate and verification switches, wherein the verification mounting plate is fixedly mounted on the welding connecting rod; the verification mounting plate has a T-shaped structure; three verification switches are fixedly embedded on both sides of the verification mounting plate; the verification switches and the positioning switches are electrically connected to welding machines connected to the welding guns on the two welding gun holders; and the verification mounting plate is located on the side of the reaction frame vertical plate.

[0010] Preferably, the bidirectional contact element includes: a sliding shaft and an extrusion plate, wherein the sliding shaft is fixedly mounted on the calibration mounting plate; the sliding shaft is a rectangular column structure; two extrusion plates are fixedly mounted on the sliding shaft, and the two extrusion plates are respectively located on both sides of the calibration mounting plate; the two extrusion plates are respectively aligned with the calibration switch on the same side; the extrusion plate is a bent steel sheet structure; and the end of the sliding shaft is a tapered structure.

[0011] Preferably, the bidirectional contact element further includes: a contact spring, wherein the contact spring is sleeved on the slide shaft and the contact spring is connected between the slide shaft and the calibration mounting plate; the contact spring is used to push the slide shaft to contact the reaction frame vertical plate.

[0012] Preferably, the adjusting component includes: a threaded cylinder and a fixed mounting block, wherein the threaded cylinder is fixedly mounted on the corner block; the inner side of the threaded cylinder is provided with threads; the fixed mounting block is fixedly mounted on the threaded cylinder; the fixed mounting block is provided with an insertion hole; a bolt is inserted into the insertion hole on the fixed mounting block, and the bolt inserted into the fixed mounting block is used for threaded connection to the reaction frame base plate.

[0013] Preferably, the adjusting component further includes: an adjusting screw and a limiting clamping block, wherein the adjusting screw is threadedly connected to the threaded cylinder; the adjusting screw is provided with a hexagonal column; the limiting clamping block is rotatably mounted on the adjusting screw; the limiting clamping block has an inclined surface structure; the inclined surface of the limiting clamping block is used to fit against the reaction frame diagonal brace.

[0014] Preferably, the adjusting component further includes: positioning bolts, and two positioning bolts are threadedly connected to the limiting clamping block; the ends of the two limiting clamping blocks are tapered structures; the two positioning bolts are respectively used to clamp and fit the edge of the reaction frame diagonal brace.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] This invention employs a welding section that can be used to cooperate with welding limiting components. This ensures that the installation position of the welding limiting components is guaranteed when welding is required. It also ensures that the spacing and range of motion of the two welding gun frames can be limited by the swing limiting rope and the distance limiting rope. This ensures that during actual welding positioning, the two welding gun frames can only weld the upper or lower end of the diagonal brace simultaneously, and cannot cross or weld the upper and lower ends of the diagonal brace on one side at the same time. This ensures that the bottom ends of the two diagonal braces can be welded and positioned later. At the same time, the welding gun switch can be used to limit the welding guns on the two welding gun frames to weld simultaneously during actual welding. This ensures that the welding is carried out synchronously in two positions during actual welding, and the cooling and shrinkage of the weld after welding is also synchronized, reducing welding errors and ensuring welding quality.

[0017] The use of bidirectional contact components facilitates the detection of the verticality of the reaction frame vertical plate during welding positioning bracing, making it easier for workers to make timely adjustments. Furthermore, if there is a problem with excessive accuracy deviation, workers cannot continue welding operations, which further improves the welding accuracy of workers. This structure makes detection more direct and reduces 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 cut off of the welding torch on the welding torch holder, requiring timely adjustment.

[0018] The use of adjustment components can assist in adjusting the displacement of the diagonal brace at the bottom of the reaction frame during welding positioning. This makes it easier for workers to adjust the position of the diagonal brace and ensures that the vertical plate of the reaction frame remains vertical after the bottom of the diagonal brace is welded. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a shield tunneling machine starting section reaction frame welding device according to the present invention;

[0020] Figure 2 This is a schematic diagram of a shield tunneling machine starting section reaction frame welding device installed behind the reaction frame according to the present invention;

[0021] Figure 3 This is a schematic diagram of the welding part structure of the present invention;

[0022] Figure 4 This is a schematic diagram of the welding limiting component structure of the present invention;

[0023] Figure 5 For the present invention Figure 1Enlarged view of the structure of region A in the middle;

[0024] Figure 6 This is a schematic diagram of the verification installation component structure of the present invention;

[0025] Figure 7 For the present invention Figure 6 Enlarged view of the structure of region B in the middle;

[0026] Figure 8 This is a cross-sectional view of the installation position of the verification switch of the present invention;

[0027] Figure 9 This is a schematic diagram of the adjustment component structure of the present invention;

[0028] Figure 10 This is a schematic diagram showing the installation position of the positioning bolts in this invention.

[0029] In the diagram: 1. Welding limiting component; 101. Welding connecting rod; 1011. Corner block; 102. Corner electromagnet; 103. Position switch; 2. Welding section; 201. Swing limiting rope; 202. Distance limiting rope; 203. Welding gun holder; 204. Welding gun switch; 3. Verification mounting component; 301. Verification mounting plate; 302. Verification switch; 4. Bidirectional contact component; 401. Sliding shaft; 402. Extrusion plate; 403. Contact spring; 5. Adjusting component; 501. Threaded cylinder; 502. Fixed mounting block; 503. Adjusting screw; 504. Limiting clamping block; 505. Positioning bolt. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Example 1: Please refer to Figures 1 to 10 As shown:

[0032] This invention provides a technical solution: a welding device for the reaction frame of the starting section of a tunnel boring machine, including a welding limiting component 1; a welding part 2 is installed on the welding limiting component 1, the welding part 2 is used for synchronous double-sided welding of diagonal braces; a verification mounting component 3 is installed on the welding limiting component 1; the verification mounting component 3 is used to improve the welding accuracy of the reaction frame; a bidirectional contact component 4 is installed on the verification mounting component 3; the bidirectional contact component 4 is used to attach to the vertical plate of the reaction frame; two adjusting components 5 are installed on the welding limiting component 1; the two adjusting components 5 are used to adjust the bottom end of the diagonal brace; the welding limiting component 1 includes: a welding connecting rod 101 and corner blocks 1011, with corner blocks 1011 fixedly installed at both ends of the welding connecting rod 101; the two corner blocks 1011 are used to attach between the vertical plate and the bottom plate of the reaction frame.

[0033] The welding limiting component 1 further includes: corner electromagnets 102 and position switches 103. Corner electromagnets 102 are fixedly embedded on the two corner blocks 1011, with the upper two corner electromagnets 102 used to magnetically attract the vertical plate of the reaction frame, and the lower two corner electromagnets 102 used to magnetically attract the bottom plate of the reaction frame. Two position switches 103 are fixedly embedded on the sides of the two corner blocks 1011, and the four position switches 103 are used to abut the sides of the vertical plate and the bottom plate of the reaction frame, respectively. The welding part 2 includes: swing limiting ropes 201 and distance limiting ropes 202. Two swing limiting ropes 201 are fixedly installed on the welding connecting rod 101. Distance limiting ropes 202 are fixedly installed at the ends of the two swing limiting ropes 201. The length of the distance limiting rope 202 is less than that of the two reaction frame diagonal braces. The diagonal spacing; the swing limiting rope 201 is used to limit the range of motion at both ends of the distance limiting rope 202; the welding part 2 also includes: a welding gun holder 203 and a welding gun switch 204, with welding gun holders 203 fixedly installed at both ends of the distance limiting rope 202; welding guns are installed on the two welding gun holders 203 respectively; welding gun switches 204 are fixedly installed on the two welding gun holders 203 respectively; the two welding gun switches 204 are connected in series with the welding guns on the welding gun holders 203; when the two welding gun switches 204 are pressed simultaneously, the welding guns on the welding gun holders 203 are activated; the welding guns on the two welding gun holders 203 are used for dual-station synchronous welding of the positioning reaction frame diagonal brace. The welding part 2 can be used to cooperate with the welding limiting component 1 to ensure the installation position of the welding limiting component 1 when welding is actually required, and to ensure the subsequent use of the swing. The motion limiting rope 201 and the distance limiting rope 202 can limit the distance and range of motion of the two welding torch holders 203, ensuring that during actual welding positioning, the two welding torch holders 203 can only weld the upper or lower end of the diagonal brace simultaneously, and cannot cross or simultaneously weld the upper and lower ends of one side of the diagonal brace. This avoids interference with the already welded diagonal brace if the upper and lower ends of one side of the diagonal brace need further correction and adjustment when the upper and lower ends of the diagonal brace on the other side are completely welded. This ensures that the bottom ends of the two diagonal braces can be welded and positioned subsequently. At the same time, the welding torch switch 204 can be used to limit the welding torches on the two welding torch holders 203 to weld simultaneously during actual welding, ensuring that the welding is carried out synchronously in both positions. The cooling and shrinkage of the weld after welding is also synchronized, reducing welding errors. Poor welding quality is a concern. During welding, localized high temperatures cause metal expansion, which shrinks upon cooling, generating residual stress. Single-sided welding can easily lead to deformation. Furthermore, the welding positioning process better meets actual specifications. Two corner blocks 1011 are attached to the vertical plate and bottom plate of the reaction frame, respectively. When the four position switches 103 are pressed, two welders can simultaneously hold the welding gun holder 203 and press the two welding gun switches 204. The welding guns on the holder 203 are used to position and weld the upper ends of the two diagonal braces simultaneously. Welding is performed synchronously, with welding wire exiting from both holders 203 at the same time. If workers fail to weld synchronously, a large amount of welding wire from welding guns that are not aligned with the weld seam will be wasted, thus limiting synchronous welding operations.

[0034] The verification mounting component 3 includes: a verification mounting plate 301 and verification switches 302. The verification mounting plate 301 is fixedly mounted on the welding connecting rod 101. The verification mounting plate 301 has a T-shaped structure. Three verification switches 302 are fixedly embedded on both sides of the verification mounting plate 301. The verification switches 302 and the position switch 103 are electrically connected to the welding machines connected to the welding guns on the two welding gun holders 203. The verification mounting plate 301 is located on the side of the vertical plate of the reaction frame. The bidirectional contact component 4 includes: a sliding shaft 401 and a pressing plate 402. The verification mounting plate 301... A sliding shaft 401 is fixedly mounted on the upper part of the sliding shaft 401. The sliding shaft 401 has a rectangular column structure. Two extrusion plates 402 are fixedly mounted on the sliding shaft 401, and the two extrusion plates 402 are located on both sides of the calibration mounting plate 301. The two extrusion plates 402 are aligned with the calibration switches 302 on the same side. The extrusion plates 402 have a bent steel sheet structure. The end of the sliding shaft 401 has a tapered structure. The bidirectional contact element 4 also includes a contact spring 403, which is sleeved on the sliding shaft 401 and connected between the sliding shaft 401 and the calibration mounting plate 301. The spring 403 is used to push the sliding shaft 401 against the vertical plate of the reaction frame; the use of bidirectional contact element 4 facilitates the detection of the verticality of the vertical plate of the reaction frame when welding the positioning brace, making it easier for workers to make timely adjustments. Furthermore, if there is a problem with excessive precision deviation, workers cannot continue welding operations, further improving welding accuracy. This structure provides more direct detection, reduces measurement difficulty, and avoids excessive tilting due to brace pushing or the brace's own weight during welding. The detection is direct and improves... The welding quality of the reaction frame is crucial. If the vertical plate of the reaction frame is pulled or pushed, causing a large tilt deviation, the bottom of the vertical plate of the reaction frame and the bottom plate of the reaction frame will be welded together, while the top and the welded joint of the diagonal brace will shift to the left or right. The spring 403 pushes the sliding shaft 401 to stick to the vertical plate of the reaction frame. Once the displacement exceeds the standard, the sliding shaft 401 will drive the extrusion plate 402 to extrude the verification switch 302, which will control the welding gun on the welding gun holder 203 to cut off the power. It is necessary to make timely adjustments to avoid the problem of difficulty in adjusting the vertical plate of the reaction frame after the bottom of the diagonal brace is welded and positioned.

[0035] In Example 2, based on Example 1, the adjusting component 5 includes: a threaded cylinder 501 and a fixing block 502. The threaded cylinder 501 is fixedly mounted on the corner block 1011; the inner side of the threaded cylinder 501 is provided with threads; the fixing block 502 is fixedly mounted on the threaded cylinder 501; the fixing block 502 is provided with an insertion hole; a bolt is inserted into the insertion hole on the fixing block 502, and the bolt inserted into the fixing block 502 is used for threaded connection to the reaction frame base plate; the adjusting component 5 also includes: an adjusting screw 503 and a limiting clamping block 504. The adjusting screw 503 is threadedly connected to the threaded cylinder 501; the adjusting screw 503 is provided with a hexagonal column; the adjusting screw 503 is provided with... A rotatable clamping block 504 is installed; the clamping block 504 has an inclined structure; the inclined surface of the clamping block 504 is used to fit against the diagonal brace of the reaction frame; the adjusting component 5 also includes: positioning bolts 505, and two positioning bolts 505 are threadedly connected to the clamping block 504; the ends of the two clamping blocks 504 are tapered structures; the two positioning bolts 505 are used to clamp and fit against the edge of the diagonal brace of the reaction frame. The adjusting component 5 can assist in adjusting the displacement of the diagonal brace at the bottom end of the reaction frame during welding positioning, 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 remains vertical after the bottom end of the diagonal brace is welded. The adjustment is simple and quick.

[0036] The working principle of this embodiment is as follows: First, when welding is actually required, two corner blocks 1011 can be attached to the vertical plate and the bottom plate of the reaction frame respectively. The protruding structure on the side of the two corner blocks 1011 can be used to limit the two sides of the vertical plate of the reaction frame. The two diagonal braces are respectively placed on the limiting clamping block 504. The bolts inserted into the fixing mounting block 502 are used to thread the bottom plate of the reaction frame. The two upper corner electromagnets 102 are used to magnetically attract the vertical plate of the reaction frame, and the two lower corner electromagnets 102 are used to magnetically attract the bottom plate of the reaction frame. At this time, the four position switches 103 are pressed respectively, so that 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 position and weld the upper ends of the two diagonal braces simultaneously. Welding is carried out synchronously. The welding guns on the two welding gun holders 203 emit welding wire at the same time. If the workers fail to weld synchronously, a large amount of welding wire that is not in contact with the weld seam will be discharged and wasted, thus limiting the synchronous operation of the workers. For welding, the swing limiting rope 201 and the distance limiting rope 202 are used to limit the length of the welding reaction frame. When welding two diagonal braces simultaneously, the distance limiting rope 202 is not long enough. At the same time, when welding the two ends of a single brace, the swing limiting rope 201 at a distance will be restrained and cannot be completed. It is necessary to weld and position the upper ends of the two braces first, and then weld and position the lower ends. The braces are clamped by rotating the positioning bolt 505. The I-beam structure of the braces is used to facilitate the clamping of the I-beam by pressing the tapered side of the positioning bolt 505. When it is necessary to adjust the bottom of the braces to support the push or pull of the reaction frame vertical plate, the hexagonal column on the adjusting screw 503 can be connected with the wrench to adjust the extension and retraction of the adjusting screw 503, control the displacement adjustment of the limiting clamping block 504, and drive the braces to fine-tune the bottom position. Then, the workers can weld the bottom of the braces again using the welding guns on the two welding gun holders 203. After the welding positioning is completed, full welding and other fine welding work can be performed.

[0037] After the welding at the top of the diagonal brace is completed, when the bottom support position of the diagonal brace is finely adjusted by adjusting part 5, if the vertical plate of the reaction frame is pulled or pushed, causing a large tilt deviation, the bottom of the vertical plate of the reaction frame and the bottom plate of the reaction frame will be welded, while the top and the welded joint of the diagonal brace will shift to the left or right. The spring 403 pushes the sliding shaft 401 to stick to the vertical plate of the reaction frame. Once the displacement exceeds the standard, the sliding shaft 401 will drive the pressing plate 402 with the opposite offset direction to press the verification switch 302. The verification installation plate 301 is equipped with verification switches 302 on both sides, which can detect the left and right displacement of the reaction frame. Once a verification switch 302 is pressed, the welding gun on the welding gun holder 203 will be de-energized, and timely adjustment is required.

[0038] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0039] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A welding device for the reaction frame of a tunnel boring machine's starting section, comprising a welding limiting member (1); wherein a welding part (2) is installed on the welding limiting member (1), characterized in that: The welding part (2) is used for synchronous double-sided welding of diagonal braces; a verification mounting part (3) is installed on the welding limiting part (1); the verification mounting part (3) is used to improve the welding accuracy of the reaction frame; The verification mounting component (3) is equipped with a two-way contact element (4); the two-way contact element (4) is used to attach to the vertical plate of the reaction frame; Two adjusting parts (5) are installed on the welding limiting part (1); the two adjusting parts (5) are used to adjust the bottom end of the diagonal brace; The welding limiting component (1) includes: a welding connecting rod (101) and corner blocks (1011), with corner blocks (1011) fixedly installed at both ends of the welding connecting rod (101); the two corner blocks (1011) are used to fit between the reaction frame vertical plate and the bottom plate respectively; The welding limiting component (1) further includes: corner electromagnets (102) and position switches (103). Corner electromagnets (102) are fixedly embedded on the two corner blocks (1011), and the two upper corner electromagnets (102) are used to magnetically attract the vertical plate of the reaction frame, and the two lower corner electromagnets (102) are used to magnetically attract the bottom plate of the reaction frame. Two position switches (103) are fixedly embedded on the sides of the two corner blocks (1011), and the four position switches (103) are used to attach to the sides of the vertical plate of the reaction frame and the bottom plate respectively. The two corner blocks (1011) are provided with protrusions on both sides. 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). A distance limiting rope (202) is fixedly installed at the ends of the two swing limiting ropes (201). The length of the distance limiting rope (202) is less than the diagonal distance between the two reaction frame diagonal braces. The swing limiting rope (201) is used to limit the range of motion of the two ends of the distance limiting rope (202).

2. The shield tunneling machine starting section reaction frame welding device according to claim 1, characterized in that: The welding section (2) further includes: a welding torch holder (203) and a welding torch switch (204). The two ends of the distance rope (202) are respectively fixedly installed with welding torch holders (203); welding torches are respectively installed on the two welding torch holders (203); welding torch switches (204) are respectively fixedly installed on the two welding torch holders (203); the two welding torch switches (204) are connected in series with the welding torches on the welding torch holders (203); the welding torches on the welding torch holders (203) are activated when the two welding torch switches (204) are pressed at the same time; the welding torches on the two welding torch holders (203) are used for dual-station synchronous welding of positioning reaction force frame diagonal bracing.

3. The shield tunneling machine starting section reaction frame welding device according to claim 2, characterized in that: The verification mounting component (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) has a T-shaped structure. Three verification switches (302) are fixedly embedded on both sides of the verification mounting plate (301). The verification switches (302) and the position switch (103) are electrically connected to the welding machines connected to the welding guns on the two welding gun holders (203). The verification mounting plate (301) is located on the side of the reaction frame vertical plate.

4. The shield tunneling machine starting section reaction frame welding device according to claim 3, characterized in that: The bidirectional contact element (4) includes: a sliding shaft (401) and an extrusion plate (402). The sliding shaft (401) is fixedly installed on the verification mounting plate (301). The sliding shaft (401) is a rectangular column structure. Two extrusion plates (402) are fixedly installed on the sliding shaft (401). The two extrusion plates (402) are located on both sides of the verification mounting plate (301). The two extrusion plates (402) are aligned with the verification switch (302) on the same side. The extrusion plate (402) is a steel sheet bending structure. The end of the sliding shaft (401) is a tapered structure.

5. The shield tunneling machine starting section reaction frame welding device according to claim 4, characterized in that: The bidirectional contact element (4) further includes: a contact spring (403), on which the contact spring (403) is sleeved, and the contact spring (403) is connected between the slide shaft (401) and the calibration mounting plate (301); the contact spring (403) is used to push the slide shaft (401) to contact the reaction frame vertical plate.

6. The shield tunneling machine starting section reaction frame welding device according to claim 1, characterized in that: The adjusting component (5) includes a threaded cylinder (501) and a fixed mounting block (502). The threaded cylinder (501) is fixedly mounted on the corner block (1011). The inner side of the threaded cylinder (501) is provided with threads. The fixed mounting block (502) is fixedly mounted on the threaded cylinder (501). 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 into the fixed mounting block (502) is used for threaded connection to the reaction frame base plate.

7. The shield tunneling machine starting section reaction frame welding device according to claim 6, characterized in that: The adjusting component (5) further includes: an adjusting screw (503) and a limiting clamping block (504). The adjusting screw (503) is threadedly connected to the threaded cylinder (501). The adjusting screw (503) is provided with a hexagonal column. The limiting clamping block (504) is rotatably installed on the adjusting screw (503). The limiting clamping block (504) has an inclined structure. The inclined surface of the limiting clamping block (504) is used to fit against the reaction frame diagonal brace.

8. The shield tunneling machine starting section reaction frame welding device according to claim 7, characterized in that: The adjusting component (5) further includes: positioning bolts (505), and two positioning bolts (505) are threadedly connected to the limiting clamping block (504); the ends of the two limiting clamping blocks (504) are tapered structures respectively; the two positioning bolts (505) are used to clamp and fit the edge of the reaction frame diagonal brace respectively.

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