Mechanical limiting device for tunnel steel arch welding

Abstract

The invention provides a tunnel steel arch welding mechanical limiting device which comprises a bottom plate, a housing, a first-stage adjusting set, a second-stage adjusting set and a third-stage adjusting set, the first-stage adjusting set comprises a first-stage knob and two first clamp rods, a first-stage mechanical linkage structure is arranged between the first-stage knob and the two first clamp rods, and a second-stage mechanical linkage structure is arranged between the second-stage knob and the second clamp rods; the second-level adjusting set comprises a second-level rotary knob and two second clamp rods, a second-level mechanical linkage structure is arranged between the second-level rotary knob and the two second clamp rods, the third-level adjusting set comprises a third-level rotary knob and a centering adjusting plate, and a third-level mechanical linkage structure is arranged between the third-level rotary knob and the centering adjusting plate. By arranging the three mechanical gears, centering limiting of the steel base plate and the I-shaped steel is achieved, the device is suitable for welding operation of steel arches of various models and sizes, the device can be repeatedly used in welding of the steel arches of the same size after initial setting, and rapid positioning and accurate splicing are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of tunnel engineering construction equipment, and in particular relates to a mechanical 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 operations for tunnel steel arch frames:

[0003] First, manually draw lines with chalk on the steel plate to be welded to mark the welding position, and then hold the steel plate close to the end of the steel arch frame for welding. This operation method is time-consuming, inefficient, has welding errors due to manual hand-held welding, cannot guarantee welding quality, and has high labor intensity.

[0004] Second, a simple limiting device is made according to the size of the I-beam and the steel pad of 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. Summary of the invention

[0005] In view of this, the present invention aims to propose a mechanical limiting device for welding of tunnel steel arch frames, so as to achieve the centering of I-beams and steel pads of the steel arch frames through mechanical adjustment, thereby improving the welding quality of I-beams and steel pads of the steel arch frames.

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

[0007] A mechanical limit device for welding a tunnel steel arch frame, comprising:

[0008] Base plate;

[0009] A cover shell is arranged at the front end of the bottom plate;

[0010] A primary adjustment group includes a primary knob and two first clamp rods symmetrically arranged on the left and right sides of the bottom plate, wherein the primary knob is mounted on the cover, and a primary mechanical linkage structure is arranged between the primary knob and the two first clamp rods to achieve synchronous approaching or moving away movement of the two first clamp rods;

[0011] A secondary adjustment group includes a secondary knob and two second clamp rods symmetrically arranged on the left and right sides of the bottom plate, the second clamp rod is located above the first clamp rod, the secondary knob is installed in the cover, and a secondary mechanical linkage structure is arranged between the secondary knob and the two second clamp rods to achieve synchronous approaching or moving away from the two second clamp rods; a slide groove is arranged opposite to the two second clamp rods, and the slide groove is a rectangular groove arranged along the length direction of the second clamp rod;

[0012] The three-stage adjustment group includes a three-stage knob and a centering adjustment plate. The three-stage knob is installed in the cover shell. The centering adjustment plate is arranged between the two second clamp rods, and two wing plates are symmetrically provided at the left and right ends of the centering adjustment plate. The sides of the two wing plates facing away from the cover shell are flush with the rear side of the centering adjustment plate. The two wing plates are slidably installed in the two slide grooves. A three-stage mechanical linkage structure is set between the three-stage knob 32 and the centering adjustment plate to realize the front and rear movement of the centering adjustment plate.

[0013] Further, the primary mechanical linkage structure includes two first racks horizontally and slidably arranged in the housing one up and one down, the teeth of the two first racks are opposite, the two first racks are respectively connected to a first clamp rod through a first bent rod, a first transmission shaft is arranged between the two first racks in the housing, a first gear and a first worm wheel are arranged on the first transmission shaft, the first gear meshes with the two first racks, the first worm wheel is vertically meshed with a first worm, and the upper end of the first worm wheel is connected to the primary knob through the first transmission rod;

[0014] The secondary mechanical linkage structure includes two second racks horizontally and slidably arranged in the cover shell one up and one down, the teeth of the two second racks are opposite, the two second racks are respectively connected to a second clamp rod through a second bent rod, a second transmission shaft is arranged between the two second racks in the cover shell, a second gear and a second worm gear are arranged on the second transmission shaft, the second gear gears mesh with the two second racks, the second worm gear is vertically meshed with a second worm, and the upper end of the second worm gear is connected to the secondary knob through the second transmission rod.

[0015] Furthermore, a first slide slot plate and a second slide slot plate are arranged in the cover shell, wherein the first slide slot plate is located above the second slide slot plate, and two slide slots are respectively provided on the bottom surface of the first slide slot plate and the top surface of the second slide slot plate in the left and right directions, and the upper first rack and the second rack in the cover shell are slidably installed in the two slide slots of the first slide slot, and the lower first rack and the second rack are slidably installed in the two slide slots of the second slide slot.

[0016] Furthermore, the first rack and the second rack on the upper side of the cover shell correspond to the first clamp rod and the second clamp rod on the right side, and the first rack and the second rack on the lower side correspond to the first clamp rod and the second clamp rod on the left side. The left end of the first slide groove is provided with a flange facing downward, and the right end of the second slide groove is provided with a flange facing upward.

[0017] Furthermore, the three-stage mechanical linkage structure includes a threaded rod and a third rotating shaft arranged in the cover along the moving direction of the centering adjustment plate, a threaded hole is opened on the front side of the centering adjustment plate, the threaded rod passes through the cover and is threadedly connected to the threaded hole, a transmission gear is set on the threaded rod, and a third gear and a third worm gear are set on the third rotating shaft, the third gear is meshed with the transmission gear, the third worm gear is vertically meshed with the third worm, and the third worm is connected to the three-stage knob through the third transmission rod.

[0018] Furthermore, the first-level knob, the second-level knob, and the third-level knob are in the form of hexagonal sockets.

[0019] Compared with the prior art, the mechanical limiter for welding a tunnel steel arch frame described in the present invention has the following advantages:

[0020] The present invention realizes the centering and limiting of the steel pad and the I-beam by setting three mechanical gears, and is suitable for welding operations of steel arch frames of various models and sizes. After the initial setting, it can be repeatedly used in the welding of steel arch frames of the same size, so as to realize rapid positioning and precise splicing, and ensure the welding quality of the steel arch frames. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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:

[0022] Figure 1 A schematic diagram of a mechanical limiter for welding a tunnel steel arch frame according to an embodiment of the present invention;

[0023] Figure 2 It is a schematic diagram of opening a mechanical limit device for welding a tunnel steel arch frame according to an embodiment of the present invention;

[0024] Figure 3 This is a diagram showing the centering state of the I-beam and the steel pad in this embodiment;

[0025] Figure 4 This is a partial structural cross-sectional view of the primary adjustment group in this embodiment;

[0026] Figure 5 This is a partial structural cross-sectional view of the secondary adjustment group in this embodiment;

[0027] Figure 6 This is a partial structural cross-sectional view of the three-stage adjustment group in this embodiment;

[0028] Figure 7 This is a structural diagram of the arrangement of the first slide plate and the second slide plate in the cover shell in this embodiment.

[0029] Description of reference numerals:

[0030] 1. First-level adjustment group;

[0031] 11. first-stage knob; 12. first fixture rod; 14. first transmission rod; 15. first worm; 16. first worm wheel; 17. first transmission shaft; 18. first gear; 19. first rack; 111. first curved rod;

[0032] 2. Secondary adjustment group;

[0033] 21. Secondary knob; 22. Second clamp rod; 24. Second transmission rod; 25. Second worm; 26. Second worm wheel; 27. Second transmission shaft; 28. Second gear; 29. ​​Second rack; 211. Second curved rod;

[0034] 3. Three-level adjustment group;

[0035] 31. three-stage knob; 32. centering adjustment plate; 33. third transmission rod; 34. third worm; 35. third worm wheel; 36. third transmission shaft; 37. third gear; 38. transmission gear; 39. threaded rod;

[0036] 4. Cover;

[0037] 42. first chute plate; 43. second chute plate;

[0038] 6. Bottom plate; 7-Steel pad; 8-I-beam. DETAILED DESCRIPTION

[0039] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0040] like Figure 1 As shown, a mechanical limiter for welding a tunnel steel arch frame comprises a bottom plate 6 and a cover 4 arranged at the front end of the bottom plate 6, as well as a primary adjustment group 1, a secondary adjustment group 2 and a tertiary adjustment group 3. When in use, a steel pad 7 is placed on the bottom plate 6, the primary adjustment group 1 is used to adjust the position of the steel pad and clamp the steel pad, and then the I-beam is placed on the steel pad, the secondary adjustment group 2 is used to adjust the position of the I-beam so that the left and right directions of the I-beam are aligned with the steel pad, and the tertiary adjustment group 3 pushes the I-beam forward so that the front and rear directions of the I-beam are aligned with the steel pad, as shown in FIG. Figure 3 shown.

[0041] The first-stage adjustment group 1, the second-stage adjustment group 2 and the third-stage adjustment group 3 are all manual mechanical adjustment structures, such as Figure 2 As shown, Figure 2 Open the state diagram for this device, as follows:

[0042] The first-level adjustment group 1 includes a first-level knob 11 and two first clamp rods 12 symmetrically arranged on the left and right sides of the bottom plate 6. The two first clamp rods 12 are located above the bottom plate 6 and close to the upper surface of the bottom plate 6. The two first clamp rods 12 are arranged horizontally and face each other. The first-level knob 11 is in the form of an inner hexagon and is installed on the top of the cover 4. A first-level mechanical linkage structure is arranged between the first-level knob 11 and the two first clamp rods 12 to achieve the synchronous movement of the two first clamp rods 12 toward or away from each other. When the two first clamp rods 12 move toward each other synchronously, they can drive the steel plate to move until the steel plate and the bottom plate 6 are aligned. The two first-level mechanical linkage structures are as follows: Figure 4 As shown, the primary mechanical linkage structure includes two first racks 19 horizontally and slidingly arranged in the housing 4 one up and one down, the teeth of the two first racks 19 are opposite, and the two first racks 19 are respectively connected to a first clamp rod 12 through a first bent rod 111, and the housing 4 is provided with a first transmission shaft 17 between the two first racks 19, and the first transmission shaft 17 is provided with a first gear 18 and a first worm gear 16, and the first gear 18 meshes with the two first racks 19, and the first worm gear 16 is vertically meshed with a first worm 15, and the upper end of the first worm 15 is connected to the primary knob 11 through the first transmission rod 14. Manually turning the primary knob 11 realizes the synchronous approach movement of the two first clamp rods 12 through the primary mechanical linkage structure.

[0043] The secondary adjustment group 2 includes a secondary knob 21 and two second clamp rods 22 symmetrically arranged on the left and right sides of the base plate 6. The two second clamp rods 22 are located above the two first clamp rods 12. The secondary knob 21 is in the form of an inner hexagon and is installed on the top of the cover 4. A secondary mechanical linkage structure is arranged between the secondary knob 21 and the two second clamp rods 22 to achieve the synchronous movement of the two second clamp rods 22 toward or away from each other. When the two second clamp rods 22 move toward each other synchronously, they can drive the I-beam to move until the left and right directions of the I-beam are aligned with the base plate 6, thereby achieving the alignment of the left and right directions of the I-beam with the steel pad. A slide groove 211 is arranged opposite the two second clamp rods 22. The slide groove 211 is a rectangular groove arranged along the length direction of the second clamp rod 22. The secondary mechanical linkage structure is as follows: Figure 5 As shown, it includes two second racks 29 horizontally and slidingly arranged in the housing 4 one up and one down, the teeth of the two second racks 29 are opposite, and the two second racks 29 are respectively connected to a second clamp rod 22 through a second bent rod 211, and the housing 4 is provided with a second transmission shaft 27 between the two second racks 29, and the second transmission shaft 27 is provided with a second gear 28 and a second worm gear 26, and the second gear 28 meshes with the two second racks 29, and the second worm gear 26 is vertically meshed with a second worm 25, and the upper end of the second worm 25 is connected to the secondary knob 21 through the second transmission rod 24. Manually turn the secondary knob 21, and realize the synchronous approach movement of the two second clamp rods 22 through the secondary mechanical linkage structure.

[0044] The three-stage adjustment group 3 includes a three-stage knob 31 and a centering adjustment plate 32. The three-stage knob 31 is in the form of an inner hexagon and is installed on the top of the cover shell 4. The centering adjustment plate 32 is arranged between the two second clamp rods 22. The distance from the center adjustment plate 32 to the bottom plate 6 is greater than the thickness of the steel pad. Two wing plates 321 are symmetrically provided at the left and right ends of the centering adjustment plate 32. The two wing plates 321 are flush with the side of the cover shell away from the rear side of the centering adjustment plate (the side away from the cover shell). The two wing plates 321 are slidably installed in the two slide grooves 211. A three-stage mechanical linkage structure is arranged between the three-stage knob 32 and the centering adjustment plate 32 to realize the front and rear movement of the centering adjustment plate 32. When the centering adjustment plate 32 moves backward (away from the cover shell), it can push the I-beam to move backward, so that the front and rear directions of the I-beam are aligned with the steel pad. The three-stage mechanical linkage structure is as follows: Figure 6 As shown, the three-stage mechanical linkage structure includes a threaded rod 39 and a third rotating shaft 36 arranged in the housing 4 along the moving direction of the centering adjustment plate 32, a threaded hole is provided on the front side of the centering adjustment plate 32, the threaded rod 39 passes through the housing 4 and is threadedly connected with the threaded hole, a transmission gear 38 is arranged on the threaded rod 39, and a third gear 37 and a third worm gear 35 are arranged on the third rotating shaft 36, the third gear 37 is meshed with the transmission gear 38, the third worm gear 35 is vertically meshed with the third worm 34, and the third worm 34 is connected to the three-stage knob 31 through the third transmission rod 33. Manually rotating the three-stage knob 31 drives the centering adjustment plate 32 to move forward and backward.

[0045] In the present invention, a first slide plate 42 and a second slide plate 43 are arranged in the housing 4, such as Figure 7 As shown, the first slide plate 42 is located above the second slide plate, and two slide grooves are respectively provided on the bottom surface of the first slide plate 42 and the top surface of the second slide plate 43 in the left and right directions. During assembly, the upper first rack 19 and the second rack 29 in the housing are slidably installed in the two slide grooves of the first slide groove 42, and the lower first rack 19 and the second rack 29 are slidably installed in the two slide grooves of the second slide groove 43.

[0046] Preferably, the upper first rack 19 and the second rack 29 in the cover shell are arranged corresponding to the first clamp rod 12 and the second clamp rod 22 on the right side, and the lower first rack 19 and the second rack 29 are arranged corresponding to the first clamp rod 12 and the second clamp rod 22 on the left side, and the left end of the first slide groove 42 is set with a flange facing downward, and the right end of the second slide groove 43 is set with a flange facing upward.

[0047] The operation method of the present invention:

[0048] Step 1: Adjust the limit device to the open state, and rotate the first-level knob 11, the second-level knob 21, and the third-level knob 31 in opposite directions respectively, so that the two first clamp rods 12 of the first-level adjustment group are extended to the maximum range, the two second clamp rods 22 of the second-level adjustment group are extended to the maximum range, and the centering adjustment plate 32 of the third-level adjustment group 3 is retracted to be close to the cover 4;

[0049] Step 2: Place the steel plate 7 to be welded on the upper part of the bottom plate 6 and make the front side of the steel plate fit with the rear side of the cover 4. Rotate the first knob 11 of the first adjustment group in the positive direction, and the two first clamp rods 12 will shrink at the same time to realize the centering clamping limit of the steel plate in the left and right directions.

[0050] Step 3: Place the I-beam 8 on the steel pad 7. At this time, the welding surface of the steel pad is close to the welding section of the I-beam, and the two flanges of the I-beam 8 are close to the centering adjustment plate 32. The secondary knob 21 of the secondary adjustment group is rotated forward, and the two second clamp rods 22 are contracted at the same time to realize the left and right direction of the I-beam and the steel pad.

[0051] Step 4, rotate the three-stage knob 31 of the three-stage adjustment group 3 forward, move the centering adjustment plate 32 backward, and push the I-beam 8 until it is aligned with the steel pad in the front-to-back direction; finally, the centering adjustment of the I-beam and the steel pad is achieved.

[0052] 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. A mechanical limiter for welding a tunnel steel arch frame, characterized in that: include: Bottom plate (6); A cover shell (4) is arranged at the front end of the bottom plate (6); A primary adjustment group (1) comprises a primary knob (11) and two first clamping rods (12) symmetrically arranged on the left and right sides of a bottom plate (6), wherein the primary knob (11) is mounted on a housing (4), and a primary mechanical linkage structure is arranged between the primary knob (11) and the two first clamping rods (12) to achieve synchronous movement of the two first clamping rods (12) towards or away from each other; The secondary adjustment group (2) comprises a secondary knob (21) and two second clamp rods (22) symmetrically arranged on the left and right sides of the bottom plate (6), the second clamp rod (22) being located above the first clamp rod (12), the secondary knob (21) being mounted on the cover (4), and a secondary mechanical linkage structure being arranged between the secondary knob (21) and the two second clamp rods (22) to achieve synchronous approaching or moving away movement of the two second clamp rods (22); a slide groove (211) being arranged opposite to the two second clamp rods (22), the slide groove (211) being a rectangular groove arranged along the length direction of the second clamp rod (22); The three-stage adjustment group (3) comprises a three-stage knob (31) and a centering adjustment plate (32). The three-stage knob (31) is mounted on a housing (4). The centering adjustment plate (32) is arranged between two second clamp rods (22). Two wing plates (321) are symmetrically arranged at the left and right ends of the centering adjustment plate (32). The sides of the two wing plates (321) facing away from the housing are flush with the rear side of the centering adjustment plate. The two wing plates (321) are slidably installed in two slide grooves (211). A three-stage mechanical linkage structure is arranged between the three-stage knob (32) and the centering adjustment plate (32) to realize the front-rear movement of the centering adjustment plate (32).

2. The mechanical limiter for welding a tunnel steel arch according to claim 1 is characterized in that: The primary mechanical linkage structure comprises two first racks (19) horizontally and slidably arranged one up and one down in the housing (4), the teeth of the two first racks (19) facing each other, the two first racks (19) are respectively connected to a first clamp rod (12) through a first bent rod (111), the housing (4) is provided with a first transmission shaft (17) between the two first racks (19), the first transmission shaft (17) is provided with a first gear (18) and a first worm wheel (16), the first gear (18) meshes with the two first racks (19), the first worm wheel (16) is vertically meshed with a first worm (15), and the upper end of the first worm (15) is connected to the primary knob (11) through a first transmission rod (14); The secondary mechanical linkage structure comprises two second racks (29) which are horizontally and slidably arranged in a housing (4) one up and one down, the teeth of the two second racks (29) are opposite to each other, the two second racks (29) are respectively connected to a second clamp rod (22) through a second bent rod (211), the housing (4) is provided with a second transmission shaft (27) between the two second racks (29), the second transmission shaft (27) is provided with a second gear (28) and a second worm gear (26), the second gear (28) meshes with the two second racks (29), the second worm gear (26) is vertically meshed with a second worm (25), and the upper end of the second worm (25) is connected to the secondary knob (21) through a second transmission rod (24).

3. The mechanical limiter for welding a tunnel steel arch according to claim 2 is characterized in that: A first slide plate (42) and a second slide plate (43) are arranged in the cover shell (4), wherein the first slide plate (42) is located above the second slide plate, and two slide grooves are respectively provided on the bottom surface of the first slide plate (42) and the top surface of the second slide plate (43) in the left and right directions, and the upper first rack (19) and the second rack (29) in the cover shell are slidably installed in the two slide grooves of the first slide groove (42), and the lower first rack (19) and the second rack (29) are slidably installed in the two slide grooves of the second slide groove (43).

4. The mechanical limiter for welding a tunnel steel arch according to claim 3 is characterized in that: The first rack (19) and the second rack (29) on the upper side of the housing correspond to the first clamp rod (12) and the second clamp rod (22) on the right side, and the first rack (19) and the second rack (29) on the lower side correspond to the first clamp rod (12) and the second clamp rod (22) on the left side. The left end of the first slide groove (42) is provided with a flange facing downward, and the right end of the second slide groove (43) is provided with a flange facing upward.

5. The mechanical limiter for welding a tunnel steel arch according to claim 1 is characterized in that: The three-stage mechanical linkage structure comprises a threaded rod (39) and a third rotating shaft (36) arranged in a housing (4) along the moving direction of the centering adjustment plate (32); a threaded hole is provided on the front side of the centering adjustment plate (32); the threaded rod (39) passes through the housing (4) and is threadedly connected to the threaded hole; a transmission gear (38) is arranged on the threaded rod (39); a third gear (37) and a third worm gear (35) are arranged on the third rotating shaft (36); the third gear (37) is meshed with the transmission gear (38); the third worm gear (35) is vertically meshed with a third worm (34); and the third worm (34) is connected to the three-stage knob (31) via a third transmission rod (33).

6. The mechanical limiter for welding a tunnel steel arch according to claim 1, characterized in that: The first-level knob (11), the second-level knob (21), and the third-level knob (31) are in the form of internal hexagons.

Images