Tunnel steel arch cutting positioning frame

Abstract

The invention relates to the technical field of steel arch cutting equipment, and discloses a tunnel steel arch cutting positioning frame which comprises a mounting plate mounted on a steel arch, a supporting part slidably arranged on the mounting plate and a cutting part connected to the supporting part. A sliding rail is arranged on the mounting plate, the sliding rail comprises a horizontal section and vertical sections arranged at the two ends of the horizontal section, the supporting part is arranged in the sliding rail in a sliding mode, the steel arch is located between the horizontal section and the vertical sections, and the cutting piece can be adjusted to face the steel arch; the supporting part comprises a sliding rod arranged on the sliding rail in a sliding mode, a rotating seat rotationally arranged at the end, away from the mounting plate, of the sliding rod and a mounting cylinder arranged on the rotating seat, the cutting piece is connected to the mounting cylinder, and the length direction of the cutting piece is perpendicular to the length direction of the sliding rod. The positioning device can be used for positioning the steel arch and is suitable for different cutting positions.

Description

Technical Field

[0001] The present application relates to the technical field of steel arch frame cutting equipment, and in particular to a tunnel steel arch frame cutting and positioning frame. Background Art

[0002] Tunnel steel arch is a commonly used support structure in tunnel construction. It is mainly used to support surrounding rock, maintain tunnel stability and control deformation. I-beams are commonly used. During tunnel construction, support parameters may be adjusted due to changes in geological conditions, design optimization, etc., and the steel arch needs to be cut and modified.

[0003] The existing Chinese patent document with application number 202111018213.3 discloses a tunnel steel arch frame precision cutting positioning frame, including a first positioning structure installed on an I-beam, a second positioning structure and a plasma cutter for cutting. The plasma cutter can maintain linear motion under the limiting effect of the steel bar, thereby improving the neatness of the cutting.

[0004] In the above technical solution, both the first positioning structure and the second positioning structure need to be installed on the I-beam to provide space for the running wheels to move. However, when the portion of the steel arch frame that needs to be cut is short, it is not enough to provide enough space for the second positioning mechanism to be installed, which greatly limits its applicability. Summary of the invention

[0005] The present application provides a tunnel steel arch cutting and positioning frame.

[0006] This application adopts the following technical solutions: A tunnel steel arch frame cutting and positioning frame, comprising a mounting plate mounted on the steel arch frame, a support portion slidably arranged on the mounting plate, and a cutting piece connected to the support portion; a slide rail is arranged on the mounting plate, the slide rail comprises a horizontal section and vertical sections arranged at both ends of the horizontal section, the support portion is slidably arranged in the slide rail, and the steel arch frame is located between the horizontal section and the vertical section, and the cutting piece can be adjusted to face the steel arch frame; the support portion comprises a sliding rod slidably arranged on the slide rail, a rotating seat rotatably arranged at one end of the sliding rod away from the mounting plate, and a mounting cylinder arranged on the rotating seat, the cutting piece is connected to the mounting cylinder, and the length direction of the cutting piece is perpendicular to the length direction of the sliding rod; A limiting member is arranged between the sliding rod and the rotating seat, and the limiting member is used to limit the rotation of the rotating seat on the sliding rod; an unlocking member is arranged on the rotating seat, and the unlocking member is used to release the limiting effect of the limiting member on the rotating seat so that the rotating seat can rotate; an interference member linked to the mounting tube is arranged on the sliding rod, and when the rotating seat rotates, the mounting tube can slide in a direction close to the steel arch frame.

[0007] By adopting the above technical solution, when the sliding rod is in the horizontal section, the cutting piece faces the web part of the steel arch frame, thereby cutting the web part, and at the corner near the web and the wing plate, the limiting effect of the limiting piece is released by the unlocking piece, and then the rotating seat is rotated, so that the lower end of the cutting piece can approach the corner and cut, and during the rotation of the rotating seat, the cutting piece can slide in the direction of the steel arch frame, thereby reducing the distance between the cutting piece and the steel arch frame and maintaining a better cutting effect.

[0008] Optionally, a roller is provided at one end of the sliding rod, the roller is located in the sliding rail, and the sliding rod and the roller are rotatably connected; a limit block is provided on the side wall of the sliding rod, the limit block abuts against the surface of the sliding rail, an extension block is provided on the limit block, a groove is provided on the surface of the sliding rail, and the extension block can be received in the limit block or extend in the groove.

[0009] By adopting the above technical solution, the sliding rod is rotatably connected to the roller. In the horizontal section, the cutting piece can be adjusted to face the cutting piece, and then the extension block extends into the slot, so that the sliding rod can no longer rotate; when moving to the vertical section, the sliding rod is rotated until the cutting piece faces the wing plate, and then the extension block extends into the slot, so that the roller slides in the slide rail, and the sliding rod is not easy to rotate.

[0010] Optionally, a receiving groove is provided on one side of the limit block facing the slide rail, the extension block slides in the receiving groove, an adjustment rod is threadedly connected to the limit block, the adjustment rod extends in the receiving groove and is rotatably connected to the extension block.

[0011] By adopting the above technical solution, the movement of the extension block can be driven by rotating the adjustment rod.

[0012] Optionally, the rotating seat is provided with a fixed cylinder, the mounting cylinder is slidably arranged on the fixed cylinder, and a first elastic member is arranged between the mounting cylinder and the fixed cylinder, the first elastic member provides a force for the mounting cylinder to move in a direction close to the steel arch frame, the resistance member includes an elliptical block arranged on one end of the sliding rod close to the rotating seat, a clearance groove is provided on the outer wall of the fixed cylinder, and a resistance rod passing through the clearance groove is provided on the side wall of the mounting cylinder, the resistance rod abuts against the side wall of the elliptical block, and when the cutting member is in a vertical state, the resistance rod abuts against the uppermost end of the elliptical block.

[0013] By adopting the above technical solution, when the rotating seat rotates, the abutment rod moves on the side wall of the elliptical block, and under the action of the first elastic member, the installation cylinder can be pulled into the fixed cylinder, thereby driving the movement of the cutting member.

[0014] Optionally, the elliptical block is rotatably arranged on the sliding rod, and the elliptical block is linked with the rotating seat, and when the rotating seat rotates, the elliptical block is synchronously driven to rotate, and the elliptical block and the rotating seat rotate in opposite directions.

[0015] By adopting the above technical solution, the elliptical block and the rotating seat rotate in opposite directions, which is more conducive to the cooperation between the elliptical block and the abutment rod to drive the sliding of the installation cylinder.

[0016] Optionally, an installation cavity is provided at one end of the sliding rod close to the rotating seat, and a rotating column is provided at one end of the rotating seat, and the rotating column is rotatably connected to the inner end surface of the installation cavity; an annular edge is coaxially provided on the elliptical block, and the annular edge is rotatably provided on the inner wall of the installation cavity; a first gear is provided on the outer wall of the rotating column, and a second gear is provided at one end of the annular edge facing the first gear; a bevel gear is rotatably provided in the installation cavity, and the bevel gear is respectively meshed with the first gear and the second gear.

[0017] By adopting the above technical solution, through the cooperation of the first gear, the second gear and the bevel gear, the rotation directions of the elliptical block and the rotating seat are opposite.

[0018] Optionally, the limiting member includes a limiting rod slidably set on the elliptical block, and a second elastic member connected to the limiting rod; the outer wall of the rotating seat is provided with a step edge, and a limiting groove is opened on the step edge, when the cutting member is in a vertical state, the second elastic member drives one end of the limiting rod to be inserted into the limiting groove; when the rotating seat needs to be driven to rotate, the unlocking member drives the limiting rod to slide out of the limiting groove.

[0019] By adopting the above technical solution, the limiting member is inserted into the limiting groove, thereby limiting the rotation of the rotating seat. After the limiting rod slides out of the limiting groove, the rotating seat can rotate.

[0020] Optionally, the unlocking member includes a sliding cylinder slidably mounted on the outer wall of the rotating seat and a third elastic member arranged in the sliding cylinder, and the sliding cylinder is provided with an unlocking rod extending toward the limiting groove; when the sliding cylinder is driven to slide in a direction close to the sliding rod, the unlocking rod drives the limiting rod to slide in a direction away from the limiting groove and disengages from the limiting groove, and the third elastic member is compressed.

[0021] By adopting the above technical solution, the slide cylinder is pushed so that the unlocking rod pushes the limiting rod out of the limiting groove, thereby enabling the rotating seat to rotate.

[0022] Optionally, a positioning column is provided on the inner end surface of the slide cylinder, and when the positioning column abuts against the end surface of the rotating seat, the end of the unlocking rod and the end of the limiting groove close to the limiting rod are flush.

[0023] By adopting the above technical solution, when the positioning column abuts against the end surface of the rotating seat, the limiting rod is just pushed out by the unlocking rod, and the sliding cylinder can no longer slide.

[0024] Optionally, a clamping plate is provided on one side of the mounting plate facing away from the slide rail, the clamping plate is clamped on the steel arch frame, and a clamping piece that is threadedly connected to the steel arch frame is provided.

[0025] By adopting the above technical solution, it is convenient to fix the mounting plate on the steel arch frame.

[0026] In summary, the present application includes at least one of the following beneficial effects: 1. The support part can slide on the slide rail, thereby driving the cutting piece to cut the web and wing of the steel arch frame respectively, and cutting can be achieved at different cutting positions; 2. When the rotating seat rotates, the cutting piece can be adjusted to a position facing a corner and cut at that position. During the rotation process, the cutting piece can move in the direction close to the steel arch frame, thereby reducing the distance and ensuring the cutting effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of an embodiment of the present application; Figure 2 is a schematic diagram of an extension block in an embodiment of the present application; Figure 3 is a cross-sectional schematic diagram of an embodiment of the present application; Figure 4 yes Figure 3 The enlarged schematic diagram of point A in the middle; Figure 5 is a schematic diagram of the rotation of the rotating seat in the embodiment of the present application; Figure 6 is an exploded schematic diagram of a limiter in an embodiment of the present application; Figure 7 Schematic diagram of the slide in the embodiment of the present application.

[0028] Description of reference numerals: 1, steel arch; 2, mounting plate; 3, cutting member; 4, supporting portion; 41, sliding rod; 42, rotating seat; 43, mounting cylinder; 5, slide rail; 51, horizontal section; 52, vertical section; 6, limiting member; 61, limiting rod; 62, second elastic member; 7, unlocking member; 71, sliding cylinder; 72, third elastic member; 8, resisting member; 81, elliptical block; 9, roller; 10, limiting block; 11 , extension block; 12, slot; 13, accommodating groove; 14, adjusting rod; 15, fixing cylinder; 17, first elastic member; 18, giving way groove; 19, abutting rod; 20, mounting cavity; 21, rotating column; 22, annular edge; 23, first gear; 24, second gear; 25, bevel gear; 26, stepped edge; 27, limiting groove; 28, unlocking rod; 29, positioning column; 30, clamping plate; 31, tightening member. DETAILED DESCRIPTION

[0029] The present application is further described in detail below in conjunction with the accompanying drawings.

[0030] The present application embodiment discloses a tunnel steel arch frame cutting and positioning frame. Figure 1 and Figure 2 The positioning frame includes a mounting plate 2, a support portion 4 slidably mounted on the mounting plate 2, and a cutting piece 3 mounted on the support portion 4. The cutting piece 3 is selected from a plasma cutter in the prior art. A clamping plate 30 is fixed on the mounting plate 2. A notch is provided on the mounting plate 2. The clamping plate 30 is formed into a shape consistent with the opening and the notch. The I-shaped steel arch frame 1 can be abutted in the notch, thereby pre-positioning the mounting plate 2 on the steel arch frame 1. The clamping plate 30 is coated on the outer wall of the steel arch frame 1. A fastening piece 31 is threadedly connected to the clamping plate 30. The fastening piece 31 is a bolt, thereby fixing the mounting plate 2 on the steel arch frame 1. The cutting position can be adjusted by adjusting the mounting position of the mounting plate 2. When the cutting portion is small, it will not affect the installation of the mounting plate 2.

[0031] A slide rail 5 is fixed on the side of the mounting plate 2 facing away from the clamping plate 30, and the slide rail 5 includes a horizontal section 51 and vertical sections 52 arranged at both ends of the horizontal section 51. The horizontal section 51 is parallel to the web of the steel arch frame 1, and the vertical section 52 is parallel to the wing of the steel arch frame 1. The support part 4 slides in the slide rail 5. When the support part 4 slides in the horizontal section 51, the cutting member 3 faces the web and cuts the web; when the support part 4 slides in the vertical section 52, the cutting member 3 faces the wing and cuts the wing.

[0032] Reference Figure 1 and Figure 2The support part 4 includes a sliding rod 41 slidably connected to the slide rail 5, a rotating seat 42 rotatably mounted on one end of the sliding rod 41 away from the mounting plate 2, and a mounting cylinder 43 mounted on the rotating seat 42. The cutting member 3 is mounted on the mounting cylinder 43, and the rod body of the cutting member 3 passes through the mounting cylinder 43. The side wall of the mounting cylinder 43 is threadedly connected with a bolt, and the cutting member 3 can be positioned and the position of the cutting member 3 can be adjusted by the bolt. The sliding rod 41 is perpendicular to the surface of the mounting plate 2, and the length direction of the cutting member 3 is perpendicular to the sliding rod 41.

[0033] A limit member 6 is provided between the sliding rod 41 and the rotating seat 42, and the limit member 6 is used to limit the rotating seat 42 so that it cannot rotate. An unlocking member 7 is installed on the rotating seat 42, and the unlocking member 7 is used to release the limiting effect of the limit member 6 on the rotating seat 42, so that the rotating seat 42 can rotate. When the sliding rod 41 slides in the horizontal section 51, the web is cut. When it moves to a certain position close to the corner of the web and the wing plate, the positioning effect on the rotating seat 42 is released by the unlocking member 7, and then the rotating seat 42 is driven to rotate, so that the cutting member 3 moves in the direction of the corresponding corner, so that the corner position can be cut, which overcomes the problem that the corner position cannot be cut due to the volume problem of the lower end of the cutting member 3.

[0034] Reference Figure 1 and Figure 2 , the slide rail 5 is a constricted structure, preferably a T-shaped structure. One end of the slide rail 5 extends in the slide rail 5 and is rotatably connected to a roller 9, which can be a bearing. A limit block 10 is fixed to the outer wall of the sliding rod 41, and the limit block 10 abuts against the surface of the slide rail 5, thereby limiting the sliding rod 41 and preventing it from being twisted. An extension block 11 is installed on the limit block 10, and the extension block 11 is a square structure. A slot 12 is provided on the slide rail 5, and the slot 12 is arranged around the outer ring of the slide rail 5. In the horizontal section 51, the extension block 11 extends into the slot 12, so that when the sliding rod 41 slides horizontally, the extension block 10 slides in the slot 12, and the sliding rod 41 is not easy to rotate. When moving to the vertical section 52, the extension block 11 is received in the limit block 10, and then the sliding rod 41 is rotated so that the cutting piece 3 faces the wing plate of the steel arch frame 1, and then the extension block 11 abuts against the slot 12, so that when the sliding rod 41 slides in the vertical section 52, the sliding rod 41 is not easy to rotate.

[0035] Reference Figure 2The limit block 10 is provided with a receiving groove 13 on one side facing the slide rail 5, and the extension block 11 is slidably connected to the receiving groove 13. An adjusting rod 14 is threadedly connected to the limit block 10, and one end of the adjusting rod 14 extends into the receiving groove 13 and is rotatably connected to the extension block 11. By rotating the adjusting rod 14, the extension block 11 can be driven to slide, so as to control the extension block 11 to be received into the receiving groove 13 or extended into the slot 12.

[0036] Reference Figure 2 and Figure 3 A fixed cylinder 15 is fixed on the rotating seat 42, and the mounting cylinder 43 is slidably inserted in the fixed cylinder 15, and the upper end of the mounting cylinder 43 exceeds the upper end of the fixed cylinder 15, and the rod body part of the cutting member 3 passes through the lower end of the fixed cylinder 15. A first elastic member 17 is installed in the fixed cylinder 15, and the first elastic member 17 is a spring, and the spring is connected between the fixed cylinder 15 and the lower end of the mounting cylinder 43. A resistance member 8 is provided on the sliding rod 41, and the resistance member 8 is used to cooperate with the mounting cylinder 43. When the rotating seat 42 rotates, the mounting cylinder 43 slides in the direction close to the web. The resistance member 8 includes an elliptical block 81 installed on the outer wall of one end of the sliding rod 41 close to the rotating seat 42. When the sliding rod 41 is in the horizontal section 51, the long axis of the elliptical block 81 is in a vertical state. The outer wall of the fixed cylinder 15 is provided with a clearance groove 18, which extends along the axial direction of the fixed cylinder 15. The side wall of the mounting cylinder 43 is fixed with a resistance rod 19, which passes through the clearance groove 18 and abuts against the side wall of the elliptical block 81. When the sliding rod 41 is located in the horizontal section 51, the cutting piece 3 is in a vertical state, and the resistance rod 19 abuts against the uppermost end of the elliptical block 81, and the first elastic member 17 is in a stretched state. When the rotating seat 42 rotates, the resistance rod 19 extends the edge of the elliptical block 81, and the first elastic member 17 drives the mounting cylinder 43 to slide into the fixed cylinder 15, so that during the rotation of the rotating seat 42, the cutting piece 3 can move in a direction close to the steel arch frame 1.

[0037] Furthermore, the elliptical block 81 is rotatably mounted on the sliding rod 41, and the elliptical block 81 can be linked with the rotating seat 42. When the rotating seat 42 rotates, the elliptical block 81 and the rotating seat 42 rotate synchronously, and the rotation directions of the elliptical block 81 and the rotating seat 42 are opposite, so that the installation cylinder 43 can slide in the direction of the steel arch frame 1 better, and when the rotating seat 42 rotates to reset, the abutment rod 19 can slide more easily through the push of the elliptical block 81. Furthermore, the abutment rod 19 can be rotated on the installation cylinder 43 by means of a small bearing, etc., so that it is more convenient to move through the abutment of the elliptical block 81.

[0038] Reference Figure 3 and Figure 4, an installation cavity 20 is provided at one end of the sliding rod 41 close to the rotating seat 42, and a rotating column 21 is fixed on the rotating seat 42. The rotating column 21 extends into the installation cavity 20 and is rotatably connected to the inner end surface of the installation cavity 20 by means of bearings or the like. A certain distance is left between the outer wall of the rotating column 21 and the inner wall of the installation cavity 20. An annular edge 22 is coaxially fixed on the elliptical block 81, and the annular edge 22 is inserted into the installation cavity 20 and is rotatably connected to the inner wall of the installation cavity 20. The rotating column 21 passes through the inner cavity of the annular edge 22, and a first gear 23 is coaxially fixed to the outer wall of the rotating column 21, and a bevel gear 25 is rotatably installed on the inner wall of the installation cavity 20, and the first gear 23 and the bevel gear 25 are meshed with each other. A second gear 24 is coaxially fixed to one end of the annular edge 22 facing the first gear 23, and the second gear 24 and the bevel gear 25 are meshed with each other. When the rotating seat 42 rotates, the elliptical block 81 can be driven to rotate in the opposite direction. Combined with Figure 5 , a schematic diagram of the state after the rotating seat 42 is rotated, and the rotating seat 42 drives the cutting member 3 to rotate.

[0039] Reference Figure 2 and Figure 6 The limiting member 6 includes a limiting rod 61 slidably disposed on the elliptical block 81 and a second elastic member 62 connected between the limiting rod 61 and the elliptical block 81. The limiting rod 61 is located on the side of the elliptical block 81 away from the rotating seat 42. A step edge 26 is fixed to the outer wall of one end of the rotating seat 42 close to the sliding rod 41, and a limiting groove 27 is provided on the step edge 26. The second elastic member 62 is a spring, one end of which is connected to the end of the limiting rod 61 and the other end is connected to the elliptical block 81. Under the action of the second elastic member 62, one end of the limiting rod 61 passes through the elliptical block 81 and is inserted into the limiting groove 27, thereby limiting the rotation of the rotating seat 42.

[0040] Reference Figure 2 , Figure 6 and Figure 7 The unlocking member 7 includes a slide 71 slidably mounted on the outer wall of the rotating seat 42 and a third elastic member 72 installed in the slide 71. The third elastic member 72 is a spring, and is connected between the rotating seat 42 and the inner end surface of the slide 71. An unlocking rod 28 is provided at one end of the slide 71 close to the step edge 26. When the slide 71 is pushed to move in the direction close to the step edge 26, the unlocking rod 28 can abut against the limiting rod 61, and push the limiting rod 61 to slide, and make the limiting rod 61 disengage from the limiting groove 27. Furthermore, a positioning column 29 is fixed to the inner end surface of the slide 71. When the positioning column 29 abuts against the end surface of the rotating seat 42, the end of the unlocking rod 28 is flush with the side of the step edge 26 away from the slide 71.

[0041] The implementation principle of a cutting positioning frame for a tunnel steel arch frame 1 in an embodiment of the present application is as follows: when the sliding rod 41 slides on the horizontal section 51, the cutting member 3 cuts the web. When moving to a position near the corner, the sliding cylinder 71 is squeezed, so that the unlocking member 7 releases the positioning effect of the limiting member 6 on the rotating seat 42. Then, the rotating seat 42 is rotated, so that the cutting member 3 faces the corner direction of the steel arch frame 1. During the rotation, the cutting member 3 can also slide a certain distance in the direction towards the corner, thereby reducing the distance from the cutting point and ensuring the cutting effect.

[0042] The above are all preferred embodiments of the present application. Without limiting the protection scope of the present application accordingly, therefore, any equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A cutting positioning frame for tunnel steel arch frames, characterized in that: The invention comprises a mounting plate (2) mounted on a steel arch frame (1), a support portion (4) slidably arranged on the mounting plate (2), and a cutting member (3) connected to the support portion (4); a slide rail (5) is arranged on the mounting plate (2), the slide rail (5) comprises a horizontal section (51) and vertical sections (52) arranged at both ends of the horizontal section (51); the support portion (4) is slidably arranged in the slide rail (5), and the steel arch frame (1) is located between the horizontal section (51) and the vertical section (52). 52), the cutting member (3) can be adjusted to face the steel arch frame (1); the supporting portion (4) comprises a sliding rod (41) slidably arranged on the sliding rail (5), a rotating seat (42) rotatably arranged on an end of the sliding rod (41) away from the mounting plate (2), and a mounting cylinder (43) arranged on the rotating seat (42), the cutting member (3) is connected to the mounting cylinder (43), and the length direction of the cutting member (3) is perpendicular to the length direction of the sliding rod (41); A limiting member (6) is arranged between the sliding rod (41) and the rotating seat (42), and the limiting member (6) is used to limit the rotation of the rotating seat (42) on the sliding rod (41); an unlocking member (7) is arranged on the rotating seat (42), and the unlocking member (7) is used to release the limiting effect of the limiting member (6) on the rotating seat (42), so that the rotating seat (42) can rotate; and a resisting member (8) is arranged on the sliding rod (41) and is linked to the installation tube (43), and when the rotating seat (42) rotates, the installation tube (43) can slide in a direction close to the steel arch frame (1).

2. The cutting and positioning frame for tunnel steel arch frames according to claim 1, wherein: A roller (9) is provided at one end of the sliding rod (41), the roller (9) is located in the sliding rail (5), and the sliding rod (41) and the roller (9) are rotatably connected; a limit block (10) is provided on the side wall of the sliding rod (41), the limit block (10) abuts against the surface of the sliding rail (5), an extension block (11) is provided on the limit block (10), a groove (12) is provided on the surface of the sliding rail (5), and the extension block (11) can be received in the limit block (10) or extend in the groove (12).

3. The cutting and positioning frame for tunnel steel arch frames according to claim 2, wherein: The limit block (10) is provided with a receiving groove (13) on one side facing the slide rail (5), the extension block (11) slides in the receiving groove (13), an adjustment rod (14) is threadedly connected to the limit block (10), and the adjustment rod (14) extends in the receiving groove (13) and is rotatably connected to the extension block (11).

4. The cutting and positioning frame for tunnel steel arch frames according to claim 3, wherein: The rotating seat (42) is provided with a fixed cylinder (15), the mounting cylinder (43) is slidably arranged on the fixed cylinder (15), and a first elastic member (17) is arranged between the mounting cylinder (43) and the fixed cylinder (15), the first elastic member (17) providing a force for the mounting cylinder (43) to move in a direction close to the steel arch frame (1), the resistance member (8) comprises an elliptical block (81) arranged on one end of the sliding rod (41) close to the rotating seat (42), the outer wall of the fixed cylinder (15) is provided with a clearance groove (18), the side wall of the mounting cylinder (43) is provided with a resistance rod (19) passing through the clearance groove (18), the resistance rod (19) is in contact with the side wall of the elliptical block (81), and when the cutting member (3) is in a vertical state, the resistance rod (19) is in contact with the uppermost end of the elliptical block (81).

5. A cutting positioning frame for a tunnel steel arch as claimed in claim 4, characterized in that: The elliptical block (81) is rotatably disposed on the sliding rod (41), and the elliptical block (81) and the rotating seat (42) are linked to each other. When the rotating seat (42) rotates, the elliptical block (81) is synchronously driven to rotate, and the elliptical block (81) and the rotating seat (42) rotate in opposite directions.

6. The cutting and positioning frame for tunnel steel arch frames according to claim 5, characterized in that: An installation cavity (20) is provided at one end of the sliding rod (41) close to the rotating seat (42); a rotating column (21) is provided at one end of the rotating seat (42); the rotating column (21) is rotatably connected to the inner end surface of the installation cavity (20); a ring edge (22) is coaxially provided on the elliptical block (81); the ring edge (22) is rotatably provided on the inner wall of the installation cavity (20); a first gear (23) is provided on the outer wall of the rotating column (21); a second gear (24) is provided at one end of the ring edge (22) facing the first gear (23); a bevel gear (25) is rotatably provided in the installation cavity (20), and the bevel gear (25) is meshed with the first gear (23) and the second gear (24), respectively.

7. The cutting and positioning frame for tunnel steel arch frames according to claim 6, characterized in that: The limiting member (6) comprises a limiting rod (61) slidably arranged on the elliptical block (81), and a second elastic member (62) connected to the limiting rod (61); the outer wall of the rotating seat (42) is provided with a stepped edge (26), and a limiting groove (27) is provided on the stepped edge (26); when the cutting member (3) is in a vertical state, the second elastic member (62) drives one end of the limiting rod (61) to be inserted into the limiting groove (27); when it is necessary to drive the rotating seat (42) to rotate, the unlocking member (7) drives the limiting rod (61) to slide out of the limiting groove (27).

8. A cutting and positioning frame for a tunnel steel arch, as described in claim 7, characterized in that: The unlocking member (7) comprises a slide cylinder (71) slidably mounted on the outer wall of the rotating seat (42) and a third elastic member (72) arranged in the slide cylinder (71), and the slide cylinder (71) is provided with an unlocking rod (28) extending toward the limiting groove (27); when the slide cylinder (71) is driven to slide in a direction approaching the sliding rod (41), the unlocking rod (28) drives the limiting rod (61) to slide in a direction away from the limiting groove (27) and escape from the limiting groove (27), and the third elastic member (72) is compressed.

9. The cutting and positioning frame for tunnel steel arch frames according to claim 8, characterized in that: A positioning column (29) is provided on the inner end surface of the slide cylinder (71). When the positioning column (29) abuts against the end surface of the rotating seat (42), the end of the unlocking rod (28) is flush with an end of the limiting groove (27) close to the limiting rod (61).

10. A cutting and positioning frame for a tunnel steel arch support according to claim 1, characterized in that: A clamping plate (30) is provided on a side of the mounting plate (2) facing away from the slide rail (5), the clamping plate (30) is clamped to the steel arch frame (1), and a clamping piece (31) is threadedly connected to the clamping plate (30) and is clamped to the steel arch frame (1).

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