Automatic limiting device for tunnel steel arch welding

Abstract

The application provides an automatic limiting device for tunnel steel arch welding, which comprises a device main body structure, a power supply group, a motor drive group, a gear shifting drive group, a first gear shifting transmission group, a second gear shifting transmission group, a third gear shifting transmission group and a system control mechanism. The motor drive group, the gear shifting drive group, the first gear shifting transmission group, the second gear shifting transmission group, the third gear shifting transmission group and the system control mechanism are matched to work, so that the I-shaped steel and the steel base plate are centered, the centering adjustment is completed, and the steel arch welding operation can be performed. The application is suitable for steel arch welding operations of various models and various sizes. After initial setting, the same size steel arch welding can be repeatedly used, automatic rapid clamping and limiting are realized, accurate splicing is achieved, and the steel arch welding quality is ensured.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of tunnel engineering construction equipment, and particularly relates to an automatic limiting device for tunnel steel arch welding. BACKGROUND

[0002] A large number of steel arches need to be transported to the hole for assembly during the drilling and blasting method tunnel construction. After the steel arch is bent in the ground shed, the two ends need to be welded with steel pads. The welding quality of the steel pad directly affects the assembly quality of the steel arch in the hole, resulting in uneven steel arch, uneven hole position, and difficult butt joint, etc. Construction problems, which seriously affect the stress condition of the initial support structure of the tunnel and threaten the safety of the initial support construction of the tunnel. At present, there are mainly two forms of limiting devices for steel pad welding operation:

[0003] First, according to the size of the I-beam constituting the steel arch and the size of the steel pad, a simple limiting device is self-made, usually a positioning structure is set according to the hole position of the steel pad, and a clamp structure is designed according to the centering distance of the I-beam and the steel pad. Once the size of the I-beam or the steel pad of the steel arch changes, the device is no longer applicable.

[0004] Second, a full-automatic welding machine for I-beam and steel pad of steel arch is built, a full-automatic operation system and a sensor monitoring system are set, and automatic welding operation is carried out by using automatic clamps and automatic mechanical arms and other mechanisms. The automatic integration degree is high, and the later maintenance and support requirements are high. SUMMARY

[0005] Therefore, the present application aims to provide an automatic limiting device for tunnel steel arch welding, which can center the I-beam and the steel pad constituting the steel arch, and then weld them to finally ensure the welding quality of the steel arch.

[0006] To achieve the above-mentioned purpose, the technical scheme of the present application is as follows:

[0007] An automatic limiting device for tunnel steel arch welding, comprising a device main body structure and a system control mechanism:

[0008] The device main body structure comprises:

[0009] The bottom plate, and two first clamp rods and two third clamp rods symmetrically arranged on the left and right sides of the bottom plate, and the first clamp rod is arranged close to the upper surface of the bottom plate, and the third clamp rod is arranged above the first clamp rod, the cover body is arranged at the front end of the bottom plate, the centering adjusting plate is arranged at the rear position of the cover body, the centering adjusting plate is arranged between the two third clamp rods, the motor driving group and the gear shifting driving group are arranged in the cover body, and the first gear shifting transmission group for driving the two first clamp rods to move synchronously close to or separate from each other, the second gear shifting transmission group for driving the two third clamp rods to move synchronously close to or separate from each other, and the third gear shifting transmission group for moving the centering adjusting plate in the front-rear direction are arranged in the cover body; the gear shifting driving group is provided with a first gear shifting position matched with the first gear shifting transmission group, a second gear shifting position matched with the second gear shifting transmission group, and a third gear shifting position matched with the third gear shifting transmission group, and the power of the motor driving group is transmitted to the above three transmission groups through the gear shifting driving group;

[0010] The system control mechanism comprises a displacement sensor arranged on the rear side of the cover shell and used for detecting displacement information of the centering adjusting plate, and a gear shifting switch, a first gear shifting button, a second gear shifting button and a third gear shifting button arranged on the top surface of the cover shell, and a system controller, and the displacement sensor, the gear shifting switch, the first gear shifting button and the second gear shifting button are connected with the system controller through signal lines.

[0011] Further, the first gear shifting transmission group comprises two first racks arranged opposite to each other, the two first racks are arranged to slide horizontally and perpendicularly to the direction of the first clamp rod in the cover body, and are respectively connected with one first clamp rod through a first bent rod, a first transmission shaft is arranged at the middle position of the two first racks, the first transmission shaft is provided with a first gear, the first gear is engaged with the two first racks, and the first transmission shaft is in transmission connection with the gear shifting driving group;

[0012] The second gear shifting transmission group comprises two third racks arranged opposite to each other, the two third racks are arranged to slide horizontally and perpendicularly to the direction of the third clamp rod in the cover body, and are respectively connected with one third clamp rod through a third bent rod, a second transmission shaft is arranged at the middle position of the two third racks, the second transmission shaft is provided with a second gear, the second gear is engaged with the two third racks, and the second transmission shaft is in transmission connection with the gear shifting driving group;

[0013] The third gear shifting transmission group comprises a threaded rod and a sliding rod corresponding to the centering adjusting plate, the centering adjusting plate is provided with a threaded hole corresponding to the threaded rod and a sliding hole corresponding to the sliding rod, the threaded rod is in threaded connection with the threaded hole, and the sliding rod is in sliding connection with the sliding hole, the sliding rod is mounted on the cover body, the threaded rod extends into the cover body, and one end of the threaded rod extending into the cover body is in transmission connection with the gear shifting driving group.

[0014] Further, the motor driving group comprises a driving motor and a driven shaft, the driven shaft is horizontally arranged along the front-rear direction of the bottom plate, the driving motor is connected to the driven shaft through a synchronous belt, and a motor transmission gear is arranged on the driven shaft;

[0015] The shift driving group comprises an electric control oil cylinder, the telescopic rod of the electric control oil cylinder is parallel to the driven shaft, the parallel telescopic rod is arranged in the cover body to form a telescopic transmission shaft, a first gear transmission shaft, a second gear transmission shaft and a third gear transmission shaft, the first gear transmission shaft is provided with a first gear and a first bevel gear, the second gear transmission shaft is provided with a second gear and a second bevel gear, and the third gear transmission shaft is provided with a third gear and a third synchronous wheel; the telescopic rod and the telescopic transmission shaft are connected through a shift connecting rod to realize synchronous axial movement of the telescopic rod and the telescopic transmission shaft, the telescopic transmission shaft is fixed with a transmission wide gear and a shift gear, the transmission wide gear is always in engagement with the motor transmission gear during the shift process, the telescopic transmission shaft drives the shift gear to move and displace, the shift gear is in engagement with the first gear when the first gear position is adjusted, the shift gear is in engagement with the second gear when the second gear position is adjusted, and the shift gear is in engagement with the third gear when the third gear position is adjusted;

[0016] The first transmission shaft is provided with a first worm gear, the first worm gear is engaged with a first worm, and a first transmission bevel gear is arranged at the end of the first worm; the first transmission bevel gear is in engagement with the first bevel gear;

[0017] The second transmission shaft is provided with a second worm gear, the second worm gear is engaged with a second worm, and a second transmission bevel gear is arranged at the end of the second worm; the second transmission bevel gear is in engagement with the second bevel gear;

[0018] The threaded rod is provided with a threaded rod synchronous wheel, the threaded rod synchronous wheel and the third synchronous wheel are connected through a threaded rod synchronous belt.

[0019] Further, the cover body is provided with a first sliding groove plate and a second sliding groove plate, the first sliding groove plate and the second sliding groove plate are respectively provided with two sliding grooves, one of the two first racks, one of the two third racks and the two sliding grooves of the first sliding groove plate are in sliding connection, and the other first rack and the third rack are in sliding connection with the two sliding grooves of the second sliding groove plate.

[0020] Further, the gear position switch comprises a power-off gear, a forward gear and a reverse gear, when the gear position switch is switched to the power-off gear, the driving motor power is disconnected, and the device is in a power-off state, when the gear position switch is switched to the forward gear, the driving motor rotates forward, and when the gear position switch is switched to the reverse gear, the driving motor rotates reversely.

[0021] Compared with the prior art, the automatic limiting device for tunnel steel arch welding has the following advantages:

[0022] The application realizes the centering and limiting of the steel base plate and the I-beam by setting the three-stage transmission gear and the corresponding driving control mechanism, is suitable for the welding operation of various types and sizes of steel arches, can be repeatedly used in the welding of steel arches of the same size after initial setting, realizes the automatic fast clamping and limiting, accurate splicing, and guarantees the welding quality of the steel arch. BRIEF DESCRIPTION OF DRAWINGS

[0023] The drawings constituting a part of the application serve to provide a further understanding of the application, the illustrative embodiments of the application and the description thereof serve to explain the application, and do not constitute an improper limitation on the application. In the drawings:

[0024] Figure 1 The structural schematic diagram of the application;

[0025] Figure 2 The initial state schematic diagram of the limiting device of the application;

[0026] Figure 3 The working state schematic diagram of the centering and clamping limiting of the steel base plate in the application;

[0027] Figure 4 The working state schematic diagram of the longitudinal centering and clamping limiting of the I-beam in the application;

[0028] Figure 5 The working state schematic diagram of the transverse centering and clamping limiting of the I-beam in the application;

[0029] Figure 6 The partial structural sectional view of the application;

[0030] Figure 7 The partial structural sectional view of the device main body structure in the application;

[0031] Figure 8 The partial structural sectional view of the motor driving group in the application;

[0032] Figure 9 The partial structural sectional view of the first gear of the gear shifting driving group in the application;

[0033] Figure 10 The partial structural sectional view of the second gear of the gear shifting driving group in the application;

[0034] Figure 11 The partial structural sectional view of the third gear of the gear shifting driving group in the application;

[0035] Figure 12 The partial structural sectional view of the first gear transmission group in the application;

[0036] Figure 13 The partial structural sectional view of the second gear transmission group in the application;

[0037] Figure 14 Partial structure sectional view of third gear transmission group in the present application;

[0038] Figure 15 Partial structure sectional view of system control mechanism in the present application.

[0039] Explanation of reference signs:

[0040] 1. Main structure of device;

[0041] 11. Bottom plate; 12. Inner plate of device; 13. First sliding chute plate; 14. Second sliding chute plate; 15. Upper plate of device; 16. Outer plate of device; 17. Power supply plate of device;

[0042] 2. Power supply group;

[0043] 21. Removable battery; 22. Battery buckle; 23. Electric wire;

[0044] 3. Motor driving group;

[0045] 31. Driving motor; 32. Driving motor mounting plate; 33. Rotational speed sensor; 34. Driving synchronous wheel; 35. Synchronous belt; 36. Driven synchronous wheel; 37. Driven shaft;

[0046] 4. Gear shifting driving group;

[0047] 41. Gear shifting gear; 42. First gear; 43. Second gear; 44. Third gear; 45. Electric control oil cylinder; 46. Gear shifting main structure plate; 47. Telescopic rod; 48. Gear shifting connecting rod; 49. Telescopic transmission shaft; 410. Lubricating sleeve; 411. Transmission wide gear; 412. Motor transmission gear; 413. First transmission shaft; 414. First helical gear; 415. Second transmission shaft; 416. Second helical gear; 417. Third transmission shaft; 418. Third synchronous wheel; 419. Top plate of gear shifting main structure;

[0048] 5. First gear transmission group;

[0049] 51. First clamp rod; 53. First transmission helical gear; 54. First transmission rod; 55. First worm; 56. First worm wheel; 57. First transmission shaft; 58. First gear; 59. First rack; 511. First bent rod;

[0050] 6. Second gear transmission group;

[0051] 61. Third clamp rod; 63. Second transmission helical gear; 64. Second transmission rod; 65. Second worm; 66. Second worm wheel; 67. Second transmission shaft; 68. Second gear; 69. Third rack; 611. Third bent rod;

[0052] 7. Third gear transmission group;

[0053] 71, centering adjustment plate; 72, threaded rod synchronous wheel; 73, threaded rod synchronous belt; 74, threaded rod; 75, sliding rod;

[0054] 8, system control mechanism;

[0055] 81, gear switch; 82, first gear button; 83, second gear button; 84, third gear button; 85, system controller; 86, signal line; 87, displacement sensor. DETAILED DESCRIPTION

[0056] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0057] As shown in Figure 1 , Figure 2 , an automatic limiting device for tunnel steel arch welding, characterized in that it comprises a device main structure 1, a first gear transmission group 5, a second gear transmission group 6, a third gear transmission group 7 and a system control mechanism 8, wherein:

[0058] The device main structure 1 comprises a bottom plate 11, the first gear transmission group 5 comprises two first clamp rods 51 symmetrically arranged on the left and right sides of the bottom plate 11, and the second gear transmission group 6 comprises two third clamp rods 61 symmetrically arranged on the left and right sides of the bottom plate 11, wherein the two first clamp rods 51 are arranged close to the upper surface of the bottom plate 11 and used for clamping the steel base plate on the bottom plate 11, the two third clamp rods 61 are located above the two first clamp rods 51 and used for clamping and fixing the I-beam, the bottom plate 11 is provided with a cover body at the front end, the third gear transmission group 7 comprises a centering adjustment plate 71 arranged above the bottom plate 11 and behind the cover body, the centering adjustment plate 71 is located between the two third clamp rods 61, and the distance from the centering adjustment plate 71 to the bottom plate 11 is greater than the thickness of the steel base plate.

[0059] During welding, first, the steel base plate is placed on the bottom plate 11, as shown in Figure 3 , the front end of the steel base plate is tightly attached to the cover body, then the second gear transmission group 6 drives the two first clamp rods 51 to move synchronously and approach until the steel base plate is clamped and fixed. Then the I-beam is placed on the steel base plate, as shown in Figure 4 , and when placed, the side edges of the two flanges of the I-beam are tightly attached to the rear surface of the centering adjustment plate 71. Finally, the third gear transmission group 7 drives the centering adjustment plate 71 to push the I-beam to move forward until the I-beam is centered on the steel base plate, then the second gear transmission group 6 drives the two third clamp rods 61 to move synchronously and approach until the I-beam is clamped and fixed, as shown in Figure 5 , the I-beam is centered on the steel base plate, the welding position precision of the I-beam and the steel base plate is ensured, and the centering adjustment is completed, and the I-beam and the steel base plate can be welded.

[0060] AsFigure 6 As shown, a motor drive group 3 and a shift drive group 4 are installed inside the housing. The transmission components of the first gear transmission group 5, the second gear transmission group 6, and the third gear transmission group 7 are also installed inside the housing. The shift drive group 4 has a first gear matching the first gear transmission group 5, a second gear matching the second gear transmission group 6, and a third gear transmission group 7. Power from the motor drive group 3 is transmitted to the first gear transmission group 5, the second gear transmission group 6, and the third gear transmission group 7 via the shift drive group 4.

[0061] The main structure of the device is as follows: Figure 7 As shown, the enclosure includes an inner side plate 12, an upper side plate 15, and an outer side plate 16 (see...). Figure 3 The device includes a power board 17, an inner side plate 12, and an outer side plate 16, which are fixedly connected to the base plate 11. The inner side plate 12 is connected to the upper plate 15 by a detachable snap-fit, and the upper plate 15 is connected to the outer side plate 16 by a detachable snap-fit. The outer side plate 16 is slidably connected to the power board 17. A first sliding groove plate 13 and a second sliding groove plate 14 are arranged facing each other inside the enclosure. The first sliding groove plate 13 and the second sliding groove plate 14 each have two horizontal sliding grooves on their facing sides.

[0062] Motor drive group 3, such as Figure 8 As shown, the motor drive group 3 includes a drive motor 31, which is fixedly mounted on a drive motor mounting plate 32. A speed sensor 33 is mounted on the drive motor 31. The output end of the drive motor 31 is fixedly connected to a driving synchronous pulley 34. The driving synchronous pulley 34 is connected to a driven synchronous pulley 36 via a synchronous belt 35. The driven synchronous pulley 36 is fixedly connected to a driven shaft 37. A motor transmission gear 412 is provided on the driven shaft 37.

[0063] The drive motor mounting plate 32 is fixedly connected to the system controller 85 and the shift main structure plate 46 to ensure that the drive motor 31 operates stably and does not resonate;

[0064] The speed sensor 33 of the drive motor 31 is used to monitor the speed change of the drive motor 31, and the collected information is transmitted to the system controller 85. The system controller 85 controls the drive motor 31 to work. When the device reaches the centering and clamping state, the system controller 85 controls the drive motor 31 to stop working to avoid short circuit of the motor.

[0065] The system control mechanism has an 8-part structure, as shown below. Figure 15As shown, including system controller 85, the system controller 85 is installed on the device inside the plate 12, the system controller 85 is connected with the gear switch 81, the first gear button 82, the second gear button 83 and the third gear button 84 through the signal line 86, respectively, the gear switch 81, the first gear button 82, the second gear button 83 and the third gear button 84 are installed on the device on the plate 15, the system controller 85 is connected with the displacement sensor 87 through the signal line 86, the displacement sensor 87 is fixed on the device inside the plate 12, the displacement sensor 87 collects the moving displacement of the I-shaped steel, and transmits the collected information to the system controller 85, the system controller 85 controls the rotation distance of the centering adjusting plate 71, realizes the transverse centering clamping limiting of the I-shaped steel.

[0066] The gear switch 81 includes power-off gear, forward gear and reverse gear, when the gear switch 81 is turned to the power-off gear, the power supply of the driving motor 31 is disconnected, and the device is in power-off state, when the gear switch 81 is turned to the forward gear, the driving motor 31 rotates forward, when the gear switch 81 is turned to the reverse gear, the driving motor 31 reverses.

[0067] The system control mechanism 8 is matched with the power supply group 2, the power supply group 2 includes detachable battery 21, the detachable battery 21 is installed on the bottom plate 11 through the battery buckle 22, the device power supply plate 17 is arranged outside the detachable battery 21, the detachable battery 21 and the device power supply plate 17 are slidingly installed, the detachable battery 21 can be quickly disassembled and installed by disassembling the device power supply plate 17. The detachable battery 21 supplies power to the system control mechanism 8 through the wire 23.

[0068] The gear drive group 4 structure is as shown Figure 9 The gear drive group 4 structure is as shown Figure 9 The gear drive group 4 structure is as shown Figure 10As shown, the gear position is the second gear position, and the second gear transmission group 6 corresponds. The second gear 43 is fixedly connected to the second gear transmission shaft 415, and the second gear transmission shaft 415 is fixedly connected to the second gear bevel gear 416. The shift gear 41 is engaged with the third gear 44 when adjusted to the third gear position, as shown in Figure 11 As shown, the gear position is the third gear position, and the third gear transmission group 7 corresponds. The third gear 44 is fixedly connected to the third gear transmission shaft 417, and the third gear transmission shaft 417 is fixedly connected to the third gear synchronizer 418. The shift main body structure plate 46 is connected to the shift main body structure top plate 419.

[0069] The shift adjustment process of the shift drive group 4 is that the extension rod 47 of the electric control oil cylinder 45 is extended or retracted, which drives the extension transmission shaft 49 to be synchronously extended or retracted through the shift connecting rod 48, and the shift gear 41 fixed to the extension transmission shaft 49 is synchronously moved to engage with the first gear 42, or the second gear 43, or the third gear 44, thereby completing the first gear shift, the second gear shift, and the third gear shift.

[0070] The tooth width of the transmission wide gear 411 of the shift drive group 4 is set as the shift stroke length, which ensures that the transmission wide gear 411 is always engaged with the motor transmission gear 412 during the shift process.

[0071] The structure of the first gear transmission group 5 is shown in Figure 12 As shown, the first gear transmission group 5 includes two first racks 59 arranged opposite to each other. One of the two first racks 59 is slidingly installed in a sliding groove of the first sliding groove plate 13, and the other first rack 59 is slidingly installed in a sliding groove of the second sliding groove plate 14. The two first racks 59 are respectively connected to a first clamp rod 51 through a first bent rod 511. A first transmission shaft 57 is arranged at the middle position of the two first racks 59. The first transmission shaft 57 is provided with a first gear 58 and a first worm gear 56. The first gear 58 is engaged with the two first racks 59 at the same time, and the first worm gear 56 is engaged with a first worm 55. The first worm 55 is provided with a first transmission bevel gear 53 through a first transmission rod 54 at the end portion. The first transmission bevel gear 53 is engaged with the first bevel gear 414 on the first gear transmission shaft 413, thereby realizing the power transmission from the shift drive group 4 to the first gear transmission group 5.

[0072] The second gear transmission group 6 is shown in Figure 13As shown, including two third rack 69, two third rack 69 horizontal and vertical third clamp rod 61 direction slidingly disposed in the cover, wherein one of the third rack 69 slidingly installed in the other slot of the first slot plate 13, the other third rack 69 slidingly installed in the other slot of the second slot plate 14, two third rack 69 respectively through a third bend rod 611 each and a third clamp rod 61 connection, two third rack 69 middle position set second transmission shaft 67, second transmission shaft 67 is provided with second gear 68 and second worm 66, second gear 68 and two third rack 69 meshing, second worm 66 meshing has second worm 65, second transmission rod 64 end through the second transmission bevel gear 63 is provided with second transmission bevel gear 63 and two gear 416 on the second gear 415 meshing, realize the power of the gear drive group 4 to the second gear transmission group 6 transmission.

[0073] The third gear transmission group 7 as Figure 14 As shown, including corresponding pair of adjustment plate 71 set screw rod 74 and slide rod 75, said centering adjustment plate 71 corresponding to screw rod 74 opening thread hole, corresponding to slide rod 75 opening slide hole, screw rod 74 and thread hole screw connection, slide rod 75 and slide hole sliding connection, said slide rod 75 is installed on the cover, screw rod 74 extends into the cover, one end of the screw rod 74 and the gear drive group 4 transmission connection. Screw rod 74 is provided with screw rod synchronous wheel 72, screw rod synchronous wheel 72 and three gear synchronous wheel 418 through the screw rod synchronous belt 73 transmission connection.

[0074] Specific use method:

[0075] The first step, the limiting device is adjusted to the initial state, the gear switch 81 is moved from the power off gear to the reverse gear, the system control mechanism 8 is powered on, the driving motor 31 is reversed, the first gear button 82 is pressed, the gear shift gear 41 in the gear drive group 4 is engaged with the first gear 42, so that the two first clamp rods 51 of the first gear transmission group 5 are stretched to the maximum range, the second gear button 83 is pressed, the gear shift gear 41 in the gear drive group 4 is engaged with the second gear 43, so that the two third clamp rods 61 of the second gear transmission group 6 are stretched to the maximum range, the third gear button 84 is pressed, the gear shift gear 41 in the gear drive group 4 is engaged with the third gear 44, so that the centering adjustment plate 71 of the third gear transmission group 7 is retracted to the inner side plate 12 of the device;

[0076] The second step, the steel pad plate to be welded is tightly attached to the upper portion of the bottom plate 11 and aligned with the top end of the inner side plate 12 of the device, the gear shift switch 81 is moved from the reverse gear to the forward gear, the driving motor 31 is driven to rotate in the forward direction, the first gear button 82 is pressed, the gear shift gear 41 of the gear shift driving group 4 is engaged with the first gear 42, so that the two first clamp rods 51 of the first gear transmission group 5 are simultaneously retracted, and the centering clamping and limiting of the steel pad plate are realized;

[0077] The third step, the upper portion of the limiting device is tightly attached to the end of the I-shaped steel section, that is, the welding surface of the steel pad plate to be welded is tightly attached to the welding section of the I-shaped steel, the third gear button 84 is pressed, the gear shift gear 41 of the gear shift driving group 4 is engaged with the third gear 44, and the system controller 85 controls the lateral rotation of the centering adjusting plate 71 of the third gear transmission group 7, so as to push the I-shaped steel to the lateral centering position, and the lateral centering of the I-shaped steel is realized.

[0078] The fourth step, the second gear button 83 is pressed, the gear shift gear 41 of the gear shift driving group 4 is engaged with the second gear 43, so that the two third clamp rods 61 of the second gear transmission group 6 are simultaneously retracted, and the longitudinal centering clamping and limiting of the I-shaped steel are realized.

[0079] The fifth step, the initial setting of the limiting device is completed, the I-shaped steel and the steel pad plate of the steel arch realize centering and limiting, the gear shift switch 81 is moved from the forward gear to the power-off gear, and the electric control mechanism of the device stops working, so that the steel arch welding operation at this position can be carried out.

[0080] After the limiting device is set, when welding the steel arch of the same type and size again, the steel pad plate to be welded can be directly inserted between the two first clamp rods 51 of the limiting device, and then the limiting device is inserted into the end of the I-shaped steel to be welded to tightly attach to the upper and lower flanges of the I-shaped steel, that is, the centering and limiting are completed, and the steel arch welding operation can be carried out. After welding, the limiting device is pulled out, and the welding operation of the next steel arch is carried out.

[0081] The above only describes the preferred embodiments of the present application and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An automatic limiting device for welding steel arch frames in tunnels, characterized in that: Includes the main structure of the device (1) and the system control mechanism (8): The main structure (1) of the device includes: A base plate (11) is provided, along with two first clamping rods (51) and two third clamping rods (61) symmetrically arranged on the left and right sides of the base plate (11). The first clamping rods (51) are positioned close to the upper surface of the base plate (11), and the third clamping rods (61) are positioned above the first clamping rods (51). A cover is provided at the front end of the base plate (11), and a centering adjustment plate (71) is provided behind the cover, positioned between the two third clamping rods (61). A motor drive group (3) and a shift drive group (4) are provided inside the cover, which drive the two first clamping rods (51). The first gear transmission group (5) moves synchronously or separates, drives the two third clamp rods (61) to move synchronously or separate, and the third gear transmission group (7) moves the centering adjustment plate (71) in the front and back direction; the shift drive group (4) is provided with a first gear matching the first gear transmission group (5), a second gear matching the second gear transmission group (6), and a third gear shifting structure matching the third gear transmission group (7); the power of the motor drive group (3) is transmitted to the above three transmission groups through the shift drive group (4); The system control mechanism (8) includes a displacement sensor (87) installed on the rear side of the cover for detecting the displacement information of the centering adjustment plate (71), a gear switch (81), a first gear button (82), a second gear button (83) and a third gear button (84) installed on the top surface of the cover, and a system controller (85). The displacement sensor (87), the gear switch (81), the first gear button (82) and the second gear button (83) are respectively connected to the system controller (85) through signal lines.

2. The automatic limiting device for welding steel arch frames in tunnels according to claim 1, characterized in that: The first gear transmission group (5) includes two first racks (59) arranged opposite each other. The two first racks (59) are slidably arranged in the cover in a direction that is horizontal and perpendicular to the direction of the first clamp rod (51), and are respectively connected to the first clamp rod (51) by a first bent rod (511). A first transmission shaft (57) is arranged in the middle of the two first racks (59). The first transmission shaft (57) is provided with a first gear (58). The first gear (58) meshes with the two first racks (59). The first transmission shaft (57) is connected to the gear shift drive group (4) in a transmission connection. The second gear transmission group (6) includes two opposing third racks (69). The two third racks (69) are slidably disposed in the cover in a direction that is horizontal and perpendicular to the direction of the third clamp rod (61), and are connected to the third clamp rod (61) by a third bent rod (611) and a third clamp rod (61) respectively. A second transmission shaft (67) is disposed in the middle of the two third racks (69). The second transmission shaft (67) is provided with a second gear (68). The second gear (68) meshes with the two third racks (69). The second transmission shaft (67) is connected to the gear shift drive group (4) for transmission. The third gear transmission group (7) includes a threaded rod (74) and a sliding rod (75) corresponding to the centering adjustment plate (71). The centering adjustment plate (71) has a threaded hole corresponding to the threaded rod (74) and a sliding hole corresponding to the sliding rod (75). The threaded rod (74) and the threaded hole are threadedly connected, and the sliding rod (75) and the sliding hole are slidably connected. The sliding rod (75) is installed on the cover, and the threaded rod (74) extends into the cover. One end of the threaded rod (74) extending into the cover is connected to the gear shift drive group (4) for transmission.

3. The automatic limiting device for welding steel arch frames in tunnels according to claim 2, characterized in that: The motor drive group (3) includes a drive motor (31) and a driven shaft (37). The driven shaft (37) is horizontal and arranged along the front and rear direction of the base plate (11). The power of the drive motor (31) is transmitted to the driven shaft (37) through the synchronous belt (35). The driven shaft (37) is equipped with a motor transmission gear (412). The shift drive assembly (4) includes an electronically controlled hydraulic cylinder (45). The telescopic rod (47) and driven shaft (37) of the electronically controlled hydraulic cylinder (45) are parallel. A telescopic transmission shaft (49), a first-gear transmission shaft (413), a second-gear transmission shaft (415), and a third-gear transmission shaft (417) are arranged parallel to the telescopic rod (47) inside the housing. The first-gear transmission shaft (413) is equipped with a first-gear gear (42) and a first-gear helical gear (414). The second-gear transmission shaft (415) is equipped with a second-gear gear (43) and a second-gear helical gear (416). The third-gear transmission shaft (417) is equipped with a third-gear gear (44) and a third-gear synchronous pulley (418). The telescopic rod (47) and the telescopic transmission shaft (49) are... 9) The axial telescopic rod (47) and the telescopic transmission shaft (49) are connected by the shift linkage (48) to realize synchronous movement. The telescopic transmission shaft (49) is fixed with a transmission wide gear (411) and a shift gear (41). The transmission wide gear (411) and the motor transmission gear (412) always maintain meshing during the shifting process. The telescopic transmission shaft (49) drives the shift gear (41) to move and change position. When the shift gear (41) is adjusted to the first gear position, it meshes with the first gear (42). When the shift gear (41) is adjusted to the second gear position, it meshes with the second gear (43). When the shift gear (41) is adjusted to the third gear position, it meshes with the third gear (44). The first drive shaft (57) is provided with a first worm wheel (56), the first worm wheel (56) meshes with a first worm (55), the end of the first worm (55) is provided with a first transmission helical gear (53), and the first transmission helical gear (53) meshes with a first stop helical gear (414); The second drive shaft (67) is provided with a second worm wheel (66), which meshes with a second worm (65). A second transmission helical gear (63) is provided at the end of the second worm (65), and the second transmission helical gear (63) meshes with a second gear helical gear (416). The threaded rod (74) is equipped with a threaded rod synchronous pulley (72), and the threaded rod synchronous pulley (72) and the three-speed synchronous pulley (418) are connected by a threaded rod synchronous belt (73).

4. The automatic limiting device for welding steel arch frames in tunnels according to claim 2, characterized in that: The cover is provided with a first sliding plate (13) and a second sliding plate (14) facing each other. The first sliding plate (13) and the second sliding plate (14) are respectively provided with two sliding grooves. One of the two first racks (59) and one of the two third racks (69) are slidably connected to the two sliding grooves of the first sliding plate (13). The other first rack (59) and the third rack (69) are slidably connected to the two sliding grooves of the second sliding plate (14).

5. An automatic limiting device for welding steel arch frames in tunnels according to claim 1, characterized in that: The position switch (81) includes a power-off position, a forward position, and a reverse position. When the position switch (81) is moved to the power-off position, the power supply to the drive motor (31) is disconnected, and the device is in a power-off state. When the position switch (81) is moved to the forward position, the drive motor (31) rotates forward. When the position switch (81) is moved to the reverse position, the drive motor (31) rotates in reverse.

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