Automatic limiting device for tunnel steel arch welding

Abstract

The invention provides an automatic limiting device for tunnel steel arch welding, which comprises a device main body structure, a power supply group, a motor driving group, a gear shifting driving group, a first gear transmission group, a second gear transmission group, a third gear transmission group and a system control mechanism, the motor driving set, the gear shifting driving set, the first gear transmission set, the second gear transmission set, the third gear transmission set and the system control mechanism work in a matched mode, centering of I-shaped steel and a steel base plate is achieved, and steel arch welding work can be conducted after centering adjustment is completed. The device is suitable for welding operation of steel arches of various models and sizes, can be repeatedly used in welding of the steel arches of the same size after initial setting, realizes automatic rapid clamping and limiting and accurate splicing, and ensures the welding quality of the steel arches.

Description

Technical Field

[0001] The invention belongs to the technical field of tunnel engineering construction equipment, and in particular relates to an automatic limiting device for welding a tunnel steel arch frame. Background Art

[0002] During the construction of a tunnel using the drill and blast method, a large number of steel arch frames need to be transported to the tunnel for assembly. After the steel arch frames are bent in the ground shed, steel pads need to be welded at both ends. The quality of steel pad welding directly affects the quality of steel arch assembly in the tunnel, resulting in construction problems such as uneven steel arch frames, uneven hole positions, and difficulty in docking, which seriously affects the stress of the initial support structure of the tunnel and threatens the safety of the initial support construction of the tunnel. At present, there are two main forms of steel pad welding using limit devices:

[0003] First, a simple limiting device is made according to the size of the I-beam and steel pad that constitute the steel arch frame. 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 between the I-beam and the steel pad. Once the size of the I-beam or steel pad of the steel arch frame changes, the device is no longer applicable.

[0004] Second, build a fully automated welding machine for steel arch frame I-beams and steel pads. By setting up a fully automatic operating system and sensor monitoring system, automated grippers, automated robotic arms and other mechanisms are used to perform automated welding operations. The automation integration is high and the subsequent maintenance and support requirements are high. Summary of the invention

[0005] In view of this, the present invention aims to propose an automatic limiting device for welding of tunnel steel arch frames, so that the I-beams and steel pads constituting the steel arch frames can be aligned and then welded, thereby ultimately ensuring the welding quality of the steel arch frames.

[0006] To achieve the above object, the technical solution of the present invention is achieved as follows:

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

[0008] The main structure of the device comprises:

[0009] A base plate, and two first clamp rods and two third clamp rods symmetrically arranged on the left and right sides of the base plate, respectively, and the first clamp rod is arranged close to the upper surface of the base plate, and the third clamp rod is located above the first clamp rod. A cover body is arranged at the front end of the base plate, and a centering adjustment plate is arranged at the rear position of the cover body, and the centering adjustment plate is located between the two third clamp rods. A motor drive group and a shift drive group are arranged in the cover body, and: a first gear transmission group that drives the two first clamp rods to move synchronously toward or away from each other, a second gear transmission group that drives the two third clamp rods to move synchronously toward or away from each other, and a third gear transmission group that moves the centering adjustment plate in a front-rear direction; the shift drive group is provided with a first gear that matches the first gear transmission group, a second gear that matches the second gear transmission group, and a third gear shift structure that matches the third gear transmission group, and the power of the motor drive group is transmitted to the above three transmission groups through the shift drive group;

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

[0011] Further, the first gear transmission group includes two first racks arranged opposite to each other, the two first racks are slidably arranged in the cover body horizontally and vertically in the direction of the first clamp rod, and are respectively connected to a first clamp rod through a first bent rod, a first transmission shaft is arranged in the middle of the two first racks, the first transmission shaft is provided with a first gear, the first gear is meshed with the two first racks, and the first transmission shaft is in transmission connection with the shift drive group;

[0012] The second gear transmission group includes two third racks arranged opposite to each other, the two third racks are slidably arranged in the cover body horizontally and vertically in the direction of the third clamp rod, and are respectively connected to a third clamp rod through a third bent rod, a second transmission shaft is arranged in the middle of the two third racks, the second transmission shaft is provided with a second gear, the second gear is meshed with the two third racks, and the second transmission shaft is in transmission connection with the shift drive group;

[0013] The third gear transmission group includes a threaded rod and a sliding rod arranged corresponding to the centering adjustment plate. The centering adjustment plate has a threaded hole corresponding to the threaded rod and a sliding hole corresponding to the sliding rod. The threaded rod and the threaded hole are threadedly connected, and the sliding rod and the sliding hole are slidably connected. The sliding rod is installed on the cover body, the threaded rod extends into the cover body, and the threaded rod extends to one end of the cover body and is transmission-connected to the gear shift drive group.

[0014] Furthermore, the motor drive group includes a driving motor and a driven shaft, the driven shaft is horizontal and arranged along the front-rear direction of the bottom plate, the driving motor power is transmitted to the driven shaft through a synchronous belt, and a motor transmission gear is arranged on the driven shaft;

[0015] The shift drive group includes an electronically controlled oil cylinder, a telescopic rod of the electronically controlled oil cylinder is parallel to a driven shaft, a telescopic transmission shaft, a first-gear transmission shaft, a second-gear transmission shaft, and a third-gear transmission shaft are arranged on the parallel telescopic rods in the cover body, the first-gear transmission shaft is provided with a first-gear gear and a first-gear helical gear, the second-gear transmission shaft is provided with a second-gear gear and a second-gear helical gear, and the third-gear transmission shaft is provided with a third-gear gear and a third-gear synchronous wheel; the telescopic rod and the telescopic transmission shaft are connected by a shift connecting rod to realize synchronous axial movement of the telescopic rod and the telescopic transmission shaft, a transmission wide gear and a shift gear are fixed on the telescopic transmission shaft, the transmission wide gear and the motor transmission gear are always kept in meshing during the shifting process, the telescopic transmission shaft drives the shift gear to move and change position, the shift gear is meshed with the first-gear gear when it is adjusted to the first gear, the shift gear is meshed with the second-gear gear when it is adjusted to the second gear, and the shift gear is meshed with the third-gear gear when it is adjusted to the third gear;

[0016] The first transmission shaft is provided with a first worm wheel, the first worm wheel is meshed with a first worm, a first transmission helical gear is provided at the end of the first worm, and the first transmission helical gear is meshed with a first gear helical gear;

[0017] The second transmission shaft is provided with a second worm wheel, the second worm wheel is meshed with a second worm, a second transmission helical gear is provided at the end of the second worm, and the second transmission helical gear is meshed with the second gear helical gear;

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

[0019] Furthermore, a first slide slot plate and a second slide slot plate are arranged opposite to each other in the cover body, and two slide slots are respectively provided on the first slide slot plate and the second slide slot plate, one of the two first racks, one of the two third racks and the two slide slots of the first slide slot plate are slidably connected, and the other first rack and the third rack are slidably connected to the two slide slots of the second slide slot plate.

[0020] Furthermore, the gear switch includes a power-off gear, a forward gear and a reverse gear. When the gear switch is moved to the power-off gear, the power supply of the drive motor is disconnected and the device is in a power-off state. When the gear switch is moved to the forward gear, the drive motor rotates forward. When the gear switch is moved to the reverse gear, the drive motor rotates reversely.

[0021] Compared with the prior art, the automatic limiter for welding a tunnel steel arch frame described in the present invention has the following advantages:

[0022] The present invention realizes the centering and limiting of steel pads and I-beams by setting three-stage transmission gears and corresponding drive control mechanisms. It is suitable for welding operations of steel arch frames of various models and sizes. After initial setting, it can be repeatedly used in welding steel arch frames of the same size, realizing automatic rapid clamping and limiting, precise splicing, and ensuring the welding quality of steel arch frames. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0024] Figure 1 A schematic diagram of the structure of the present invention;

[0025] Figure 2 A schematic diagram of the initial state of the limiting device of the present invention;

[0026] Figure 3 Schematic diagram of the working state of the centering, clamping and limiting of the steel pad in the present invention;

[0027] Figure 4 A schematic diagram of the working state of the longitudinal centering, clamping and limiting of the I-beam in the present invention;

[0028] Figure 5 A schematic diagram of the working state of the I-beam transverse centering, clamping and limiting in the present invention;

[0029] Figure 6 A partial structural cross-sectional view of the present invention;

[0030] Figure 7 A partial structural cross-sectional view of the main structure of the device in the present invention;

[0031] Figure 8 A sectional view of the local structure of the motor drive group in the present invention;

[0032] Fig. 9 A partial structural cross-sectional view of the first gear position of the shift drive group in the present invention;

[0033] Fig.10 A partial structural cross-sectional view of the second gear position of the gear shift drive group in the present invention;

[0034] Fig.11 A partial structural cross-sectional view of the third gear of the shift drive group in the present invention;

[0035] Fig.12 A partial structural cross-sectional view of the first gear transmission group in the present invention;

[0036] Fig.13 A partial structural cross-sectional view of the second gear transmission group in the present invention;

[0037] Fig.14 A partial structural cross-sectional view of the third gear transmission group in the present invention;

[0038] Fig.15 A partial structural cross-sectional view of the system control mechanism in the present invention.

[0039] Description of reference numerals:

[0040] 1. Main structure of the device;

[0041] 11. Bottom plate; 12. Install inner side plate; 13. First slide plate; 14. Second slide plate; 15. Install upper plate; 16. Install outer side plate; 17. Install power supply plate;

[0042] 2. Power pack;

[0043] 21. Removable battery; 22. Battery clip; 23. Wires;

[0044] 3. Motor drive group;

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

[0046] 4. Gear shift drive group;

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

[0048] 5. First gear transmission group;

[0049] 51, first fixture rod; 53, first transmission bevel gear; 54, first transmission rod; 55, first worm; 56, first worm wheel; 57, first transmission shaft; 58, first gear; 59, first rack; 511, first curved rod;

[0050] 6. Second gear transmission group;

[0051] 61, third fixture rod; 63, second transmission bevel gear; 64, second transmission rod; 65, second worm; 66, second worm wheel; 67, second transmission shaft; 68, second gear; 69, third rack; 611, third curved 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. Shift switch; 82. First shift button; 83. Second shift button; 84. Third shift button; 85. System controller; 86. Signal line; 87. Displacement sensor. DETAILED DESCRIPTION

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

[0057] like Figure 1 , Figure 2 As shown, an automatic limiter for welding a tunnel steel arch frame is characterized in that it includes 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 main structure 1 of the device includes a base plate 11, a first gear transmission group 5 includes two first clamp rods 51 symmetrically arranged on the left and right sides of the base plate 11, and a second gear transmission group 6 includes two third clamp rods 61 symmetrically arranged on the left and right sides of the base plate 11, wherein the two first clamp rods 51 are arranged close to the upper surface of the base plate 11 and are used to clamp the steel pad on the base plate 11, and the two third clamp rods 61 are located above the two first clamp rods 51 and are used to clamp and fix the I-beam, a cover body is arranged at the front end of the base plate 11, and the third gear transmission group 7 includes a centering adjustment plate 71 arranged above the base plate 11 and behind the cover body, and 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 base plate 11 is greater than the thickness of the steel pad.

[0059] During welding, first place the steel plate on the bottom plate 11, as shown in FIG. Figure 3 As shown, the front end of the steel plate is close to the cover, and then the second gear transmission group 6 drives the two first clamp rods 51 to move synchronously until the steel plate is clamped and fixed. Then the I-beam is placed on the steel plate, as shown in FIG. Figure 4 As shown, when placing, ensure that the side edges of the two wing plates of the I-beam are close to the rear side of the centering adjustment plate 71. Finally, the third gear transmission group 7 drives the centering adjustment plate 71 to push the I-beam forward until the I-beam reaches the centering position of the steel pad, and then the second gear transmission group 6 drives the two third clamp rods 61 to move synchronously until the I-beam is clamped and fixed. Figure 5 As shown, the I-beam is aligned with the steel pad to ensure the welding position accuracy of the I-beam and the steel pad. After the alignment adjustment is completed, the welding operation of the I-beam and the steel pad can be carried out.

[0060] like Figure 6 As shown, the motor drive group 3 and the shift drive group 4 are arranged in the housing, and the transmission components of the first gear transmission group 5, the second gear transmission group 6, and the third gear transmission group 7 are arranged in the housing respectively. 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 three-gear shifting structure matching the third gear transmission group 7. The power of 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 through the shift drive group 4.

[0061] The main structure 1 of the device is as follows Figure 7 As shown, the cover body includes an inner plate 12, an upper plate 15, and an outer plate 16 (see Figure 3 ) and a device power board 17, the device inner side plate 12 and the device outer side plate 16 are respectively fixedly connected to the bottom plate 11, the device inner side plate 12 and the device upper plate 15 are connected by a disassembly buckle, the device upper plate 15 and the device outer side plate 16 are connected by a disassembly buckle, and the device outer side plate 16 is slidably connected to the device power board 17. The first slide plate 13 and the second slide plate 14 are arranged opposite to each other in the cover body, and two slide grooves are respectively arranged in the horizontal direction on the opposite sides of the first slide plate 13 and the second slide plate 14.

[0062] Motor drive group 3 Figure 8 As shown, the motor drive group 3 includes a drive motor 31, the drive motor 31 is fixedly mounted on a drive motor mounting plate 32, a speed sensor 33 is installed on the drive motor 31, the output end of the drive motor 31 is fixedly connected to an active synchronous wheel 34, the active synchronous wheel 34 is connected to a driven synchronous wheel 36 through a synchronous belt 35, the driven synchronous wheel 36 is fixedly connected to a driven shaft 37, and a motor transmission gear 412 is arranged on the driven shaft 37.

[0063] The drive motor mounting plate 32 is fixedly connected to the system controller 85 and the shift body structural plate 46 to ensure that the drive motor 31 operates stably and without resonance;

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

[0065] The structure of the system control mechanism 8 is as follows: Fig.15As shown, it includes a system controller 85, which is installed on the inner plate 12 of the device. The system controller 85 is connected to the gear switch 81, the first gear button 82, the second gear button 83 and the third gear button 84 through signal lines 86 respectively. The gear switch 81, the first gear button 82, the second gear button 83 and the third gear button 84 are respectively installed on the upper plate 15 of the device. The system controller 85 is connected to a displacement sensor 87 through the signal line 86. The displacement sensor 87 is fixed on the inner plate 12 of the device. The displacement sensor 87 collects the displacement of the I-beam and transmits the collected information to the system controller 85. The system controller 85 controls the rotation distance of the centering adjustment plate 71 to realize the lateral centering clamping limit of the I-beam.

[0066] The gear switch 81 includes a power-off gear, a forward gear and a reverse gear. When the gear switch 81 is moved to the power-off gear, the power supply of the drive motor 31 is disconnected and the device is in a power-off state. When the gear switch 81 is moved to the forward gear, the drive motor 31 rotates forward. When the gear switch 81 is moved to the reverse gear, the drive motor 31 rotates reversely.

[0067] The system control mechanism 8 is matched with a power pack 2, which includes a removable battery 21, which is mounted on the bottom plate 11 via a battery buckle 22, and the device power board 17 is arranged outside the removable battery 21. The removable battery 21 and the device power board 17 are slidably mounted, and the removable battery 21 can be quickly removed and installed by removing the device power board 17. The removable battery 21 supplies power to the system control mechanism 8 via a wire 23.

[0068] The structure of the shift drive group 4 is as follows Fig. 9 As shown, it includes an electric control oil cylinder 45, which is fixedly mounted on the main structure plate 46 of the shifting gear. The telescopic rod 47 of the electric control oil cylinder 45 is parallel to the driven shaft 37, and the telescopic rod 47 of the electric control oil cylinder 45 is fixedly connected to the shifting connecting rod 48, and the shifting connecting rod 48 is connected to the telescopic transmission shaft 49. The telescopic rod 47 of the electric control oil cylinder 45 moves horizontally synchronously with the telescopic transmission shaft 49 through the shifting connecting rod 48. A lubrication sleeve 410 is provided at the bottom of the telescopic transmission shaft 49, and a transmission wide gear 411 and a shifting gear 41 are fixed on the telescopic transmission shaft 49. The transmission wide gear 411 meshes with the motor transmission gear 412, and the motor transmission gear 412 is fixed on the driven shaft 37. When the shifting gear 41 is adjusted to the first gear, it meshes with the first gear gear 42. Fig. 9 As shown, this position is the first gear position, corresponding to the first gear transmission group 5, the first gear gear 42 is fixedly connected to the first gear transmission shaft 413, and the first gear transmission shaft 413 is fixedly connected to the first gear bevel gear 414. When the shift gear 41 is adjusted to the second gear, it meshes with the second gear gear 43. Fig.10As shown, this gear is the second gear position, corresponding to the second gear transmission group 6, the second gear 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 helical gear 416. When the shift gear 41 is adjusted to the third gear, it meshes with the third gear gear 44. Fig.11 As shown, this gear is the third gear position, corresponding to the third gear transmission group 7. The third gear gear 44 is fixedly connected to the third gear transmission shaft 417, the third gear transmission shaft 417 is fixedly connected to the third gear synchronization wheel 418, and the shift main structure plate 46 is connected to the shift main structure top plate 419.

[0069] The shift adjustment process of the shift drive group 4 is specifically that the telescopic rod 47 of the electronically controlled oil cylinder 45 extends or contracts, and the telescopic transmission shaft 49 is synchronously extended or contracted by the shift connecting rod 48, and the shift gear 41 fixed on the telescopic transmission shaft 49 moves synchronously to mesh with the first gear gear 42, the second gear gear 43, or the third gear gear 44, and the first gear shift, the second gear shift, and the third gear shift are completed accordingly.

[0070] The tooth width of the transmission wide gear 411 of the shift drive group 4 is set to the shift stroke length to ensure that the transmission wide gear 411 is always meshed with the motor transmission gear 412 during the shift process.

[0071] The structure of the first gear transmission group 5 is as follows Fig.12 As shown, it includes two first racks 59 arranged opposite to each other, one of the two first racks 59 is slidably installed in a slide groove of the first slide groove plate 13, and the other first rack 59 is slidably installed in a slide groove of the second slide groove plate 14, and the two first racks 59 are respectively connected to a first clamp rod 51 through a first bent rod 511, and a first transmission shaft 57 is arranged in 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, wherein the first gear 58 and the two first racks 59 are meshed at the same time, and the first worm gear 56 is meshed with a first worm 55, and a first transmission bevel gear 53 is arranged at the end of the first worm 55 through a first transmission rod 54, and the first transmission bevel gear 53 is meshed with a first gear bevel gear 414 on the first gear transmission shaft 413, so as to realize the transmission of power of the shift drive group 4 to the first gear transmission group 5.

[0072] The second gear transmission group 6 is as follows Fig.13As shown, it includes two third racks 69 arranged opposite to each other, and the two third racks 69 are slidably arranged in the cover body horizontally and vertically in the direction of the third clamp rod 61. One of the third racks 69 is slidably installed in the other slide groove of the first slide groove plate 13, and the other third rack 69 is slidably installed in the other slide groove of the second slide groove plate 14. The two third racks 69 are respectively connected to a third clamp rod 61 through a third bent rod 611. A second transmission shaft 67 is arranged in the middle position of the two third racks 69. The second transmission shaft 67 is provided with a second gear 68 and a second worm gear 66. The second gear 68 and the two third racks 69 are meshed at the same time. The second worm gear 66 is meshed with a second worm 65. The end of the second worm 65 is provided with a second transmission bevel gear 63 through a second transmission rod 64. The second transmission bevel gear 63 is meshed with the second gear bevel gear 416 on the second gear transmission shaft 415, so as to realize the transmission of the power of the shift drive group 4 to the second gear transmission group 6.

[0073] The third gear transmission group 7 is as follows Fig.14 As shown, it includes a threaded rod 74 and a slide rod 75 arranged corresponding to the centering adjustment plate 71, the centering adjustment plate 71 has a threaded hole corresponding to the threaded rod 74 and a slide hole corresponding to the slide rod 75, the threaded rod 74 is threadedly connected to the threaded hole, the slide rod 75 is slidably connected to the slide hole, the slide rod 75 is installed on the cover body, the threaded rod 74 extends into the cover body, and the threaded rod 74 extends to one end of the cover body and is transmission-connected to the shift drive group 4. The threaded rod 74 is provided with a threaded rod synchronous wheel 72, and the threaded rod synchronous wheel 72 and the third gear synchronous wheel 418 are transmission-connected through a threaded rod synchronous belt 73.

[0074] Specific usage:

[0075] The first step is to adjust the limit device to the initial state, toggle the gear switch 81 from the power-off gear to the reverse gear, power on the system control mechanism 8, drive the motor 31 to reverse, press the first gear button 82, the shift gear 41 in the shift drive group 4 is meshed with the first gear gear 42, so that the two first clamp rods 51 of the first gear transmission group 5 are extended to the maximum range, and then press the second gear button 83, the shift gear 41 in the shift drive group 4 is meshed with the second gear gear 43, so that the two third clamp rods 61 of the second gear transmission group 6 are extended to the maximum range, and then press the third gear button 84, the shift gear 41 in the shift drive group 4 is meshed with the third gear gear 44, so that the centering adjustment plate 71 of the third gear transmission group 7 is retracted to the inner plate 12 of the close contact device;

[0076] In the second step, the steel backing plate to be welded is placed close to the upper part of the bottom plate 11 and aligned with the top of the inner plate 12 of the device, the gear switch 81 is switched from the reverse gear to the forward gear, the drive motor 31 is driven to run forward, and the first gear button 82 is pressed, the shift gear 41 in the shift drive group 4 is meshed with the first gear gear 42, so that the two first clamp rods 51 of the first gear transmission group 5 are contracted at the same time, so as to realize the centering clamping limit of the steel backing plate;

[0077] The third step is to place the upper part of the limit device close to the cross-section end of the I-beam, that is, the welding surface of the steel pad to be welded close to the welding cross-section of the I-beam, press the third gear button 84, the shift gear 41 in the shift drive group 4 is meshed with the third gear gear 44, and the system controller 85 controls the centering adjustment plate 71 of the third gear transmission group 7 to rotate out horizontally, push the I-beam to the horizontal centering position, and realize the horizontal centering of the I-beam;

[0078] The fourth step is to press the second gear button 83, so that the shift gear 41 in the shift drive group 4 meshes with the second gear gear 43, so that the two third clamp rods 61 of the second gear transmission group 6 are simultaneously contracted to achieve the longitudinal centering clamping and limiting of the I-beam;

[0079] The fifth step is to complete the initial setting of the limit device, the I-beam and the steel pad of the steel arch frame are aligned and limited, and the gear switch 81 is toggled from the positive gear to the power-off gear, and the device electric control mechanism stops working, and the steel arch frame welding operation can be carried out at this location;

[0080] After the setting of the limit device is completed, when welding a steel arch frame of the same model and size again, the steel pad to be welded can be directly inserted between the two first clamp rods 51 of the limit device, and then the limit device side is inserted into the end of the I-beam to be welded until the upper and lower flanges of the I-beam are close to the centering adjustment plate 71, thus completing the centering limit and the steel arch frame welding operation can be carried out. After welding is completed, the limit device is pulled out and the welding operation of the next steel arch frame is carried out.

[0081] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An automatic limiter for welding a tunnel steel arch frame, characterized in that: It includes a device main structure (1) and a system control mechanism (8): The device main structure (1) comprises: A base plate (11), and two first clamp rods (51) and two third clamp rods (61) symmetrically arranged on the left and right sides of the base plate (11), wherein the first clamp rod (51) is arranged close to the upper surface of the base plate (11), and the third clamp rod (61) is located above the first clamp rod (51); a cover body is arranged at the front end of the base plate (11), and a centering adjustment plate (71) is arranged at the rear of the cover body, and the centering adjustment plate (71) is located between the two third clamp rods (61); a motor drive group (3) and a gear shift drive group (4) are arranged in the cover body, and: drive the two first clamp rods (51) The first gear transmission group (5) moves synchronously toward or away from each other, drives the second gear transmission group (6) for moving two third clamp rods (61) toward or away from each other, and causes the third gear transmission group (7) to move the centering adjustment plate (71) in the front-rear 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) comprises a displacement sensor (87) arranged on the rear side of the housing for detecting 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) arranged on the top surface of the housing, and a system controller (85), wherein 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) via signal lines.

2. The automatic position limiting device for tunnel steel arch welding according to claim 1 is characterized in that: The first gear transmission group (5) comprises two first racks (59) arranged opposite to each other, the two first racks (59) are slidably arranged in the cover body horizontally and vertically in the direction of the first clamp rod (51), and are respectively connected to a first clamp rod (51) through 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) and the two first racks (59) are meshed, and the first transmission shaft (57) is transmission-connected to the gear shift drive group (4); The second gear transmission group (6) comprises two third racks (69) arranged opposite to each other, the two third racks (69) are slidably arranged in the cover body horizontally and vertically in the direction of the third clamp rod (61), and are respectively connected to a third clamp rod (61) through a third bent rod (611), a second transmission shaft (67) is arranged 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) and the two third racks (69) are meshed, and the second transmission shaft (67) is connected to the gear shift drive group (4) in transmission connection; The third gear transmission group (7) comprises a threaded rod (74) and a sliding rod (75) arranged 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; the sliding rod (75) and the sliding hole are slidably connected; the sliding rod (75) is mounted on the cover body; the threaded rod (74) extends into the cover body; one end of the threaded rod (74) extends to the cover body and is transmission-connected to the gear shift drive group (4).

3. The automatic position limiting device for tunnel steel arch welding according to claim 2 is characterized in that: The motor drive group (3) comprises a driving motor (31) and a driven shaft (37), wherein the driven shaft (37) is horizontal and arranged along the front-rear direction of the bottom plate (11), and the power of the driving motor (31) is transmitted to the driven shaft (37) through a synchronous belt (35), and a motor transmission gear (412) is arranged on the driven shaft (37); The shift drive group (4) comprises an electric control oil cylinder (45), a telescopic rod (47) of the electric control oil cylinder (45) and a driven shaft (37) 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 on the parallel telescopic rod (47) in the housing, the first gear transmission shaft (413) is provided with a first gear gear (42) and a first gear helical gear (414), the second gear transmission shaft (415) is provided with a second gear gear (43) and a second gear helical gear (416), and the third gear transmission shaft (417) is provided with a third gear gear (44) and a third gear synchronous wheel (418); the telescopic rod (47) and the telescopic transmission shaft (4 9) connected by a shift connecting rod (48), the axial telescopic rod (47) and the telescopic transmission shaft (49) are synchronously moved, a transmission wide gear (411) and a shift gear (41) are fixed on the telescopic transmission shaft (49), the transmission wide gear (411) and the motor transmission gear (412) are always meshed during the shifting process, the telescopic transmission shaft (49) drives the shift gear (41) to move and change position, the shift gear (41) is meshed with the first gear gear (42) when it is adjusted to the first gear position, the shift gear (41) is meshed with the second gear gear (43) when it is adjusted to the second gear position, and the shift gear (41) is meshed with the third gear gear (44) when it is adjusted to the third gear position; The first transmission shaft (57) is provided with a first worm wheel (56), the first worm wheel (56) is meshed with a first worm (55), a first transmission bevel gear (53) is provided at the end of the first worm (55), and the first transmission bevel gear (53) is meshed with a first gear bevel gear (414); The second transmission shaft (67) is provided with a second worm wheel (66), the second worm wheel (66) is meshed with a second worm (65), a second transmission bevel gear (63) is provided at the end of the second worm (65), and the second transmission bevel gear (63) is meshed with a second gear bevel gear (416); The threaded rod (74) is provided with a threaded rod synchronous wheel (72), and the threaded rod synchronous wheel (72) and the third gear synchronous wheel (418) are connected in transmission via a threaded rod synchronous belt (73).

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

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

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