A tmb mechanical tool changer and method of using same

Abstract

The application discloses a TBM mechanical tool changing device and a use method thereof, which comprises a fixing frame detachably connected with a tool box wall, one end of the fixing frame being fixedly connected with a fixing arm, the fixing arm being closely attached to the tool box wall during use; a pry arm is rotatably connected with the end of the fixing arm through a rotating shaft, one end of the pry arm extending into the tool box is in contact with a cutter ring of a rolling cutter during use; a pair of mounting blocks are fixedly connected on the fixing frame, a puller handle and a winding drum are rotatably connected on the two mounting blocks through the same shaft; a pull rope is wound on the winding drum, one end of the pull rope away from the winding drum is fixedly connected with a pull claw; the pull claw is a U-shaped rod, the pull claw clamps the upper and lower surfaces of the rolling cutter during use, and pull claw hooks for hooking cutter shafts of the rolling cutter are fixedly connected with two free ends of the pull claw. The problems that the existing mechanical tool changing device is difficult to find a force point, the labor-saving effect is not obvious, and the lateral top tool and pull tool operations are time-consuming and labor-consuming are solved.

Description

Technical Field

[0001] This invention relates to the field of tunnel construction technology, specifically to a TBM mechanical cutter changer and its usage method. Background Technology

[0002] A tunnel boring machine (TBM) is a heavy-duty machine used for tunnel excavation, effectively minimizing the impact on surface traffic and buildings. Due to the complex geology of underground tunnels, particularly the prevalence of hard rock, the cutterheads of the TBM experience significant wear. It is difficult for a TBM to complete the entire tunnel construction without changing the cutterheads; therefore, a cutterhead replacement device is needed to periodically replace the cutterheads to ensure the TBM's normal excavation progress.

[0003] Currently, traditional mechanical tool changers use a pry bar to remove the tool, which has the following main disadvantages: 1. It is not easy to find a leverage point with the pry bar, the labor-saving effect is not obvious, it is difficult for the operator to push the tool from the side, and the pry bar is prone to deformation after repeated use, affecting the later use effect; 2. The tool pulling operation is carried out by manually pulling with a rope, which is not only troublesome to put on the rope, but also labor-intensive when pulling, and the tool unloading operation is time-consuming and laborious. Summary of the Invention

[0004] To address the aforementioned shortcomings of existing technologies, this invention provides a TBM mechanical tool changer and its usage method, which solves the problems of existing mechanical tool changers having difficulty finding leverage points, insignificant labor-saving effects, and time-consuming and labor-intensive side-mounted and pull-out tool operations.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] In a first aspect, a TBM mechanical tool changing device is provided, which includes a fixed frame detachably connected to the tool box wall, a fixed arm fixedly connected to one end of the fixed frame, and the fixed arm part closely fitting the tool box wall during use; a pry arm is rotatably connected to the end of the fixed arm through a rotating shaft, and the end of the pry arm extending into the tool box during use contacts and connects with the cutting ring of the hob.

[0007] A pair of mounting blocks are fixedly connected to the fixed frame. A pull knife handwheel and a winding drum are rotatably connected to the two mounting blocks via the same shaft. A pull rope is wound around the winding drum, and the end of the pull rope away from the winding drum is fixedly connected to the pull claw.

[0008] The pull claw is a U-shaped rod. When in use, the pull claw clamps the upper and lower surfaces of the hob. Both free ends of the pull claw are fixedly connected to pull claw hooks for hooking the cutter shaft of the hob.

[0009] The beneficial effects of this invention are as follows: When in use, the fixing bracket is fixed at the entrance of the cutter box, eliminating the need for the operator to constantly hold the cutter changing device during cutter disassembly, thus saving effort. The cutter shafts at both ends of the cutter are secured inside the cutter box via C-blocks and bolts. After removing the bolts, the operator places the cutter in the U-shaped pull claw, extends the pry arm into one end of the cutter box to contact the cutter's cutter ring, and moves the other end of the pry arm to push the cutter shaft out of the C-block until it is hooked by the pull claw hook. This side-push method of cutting is very effective and greatly reduces the difficulty of operation. Furthermore, rotating the cutter handwheel drives the winding drum, which in turn moves the pull rope, pulling the pull claw. The pull claw hook can then hook both ends of the cutter shaft, further reducing the difficulty of cutting.

[0010] Furthermore, the fixed arm includes a contact part and an extension part. During use, the contact part fits tightly against the tool box wall, and the extension part is triangular and does not contact the tool box wall. The rotating shaft is located at the tip of the extension part. The pry arm is divided into a first arm and a second arm by the extension line of the rotating shaft. The length of the first arm is greater than the length of the second arm.

[0011] The beneficial effects of the above technical solution are as follows: the contact part of the fixed arm is designed for tight connection with the tool box, and the extension part is designed to position the rotating shaft as close as possible to the end of the second arm, thereby extending the length of the first arm and reducing the length of the second arm. The pry arm constitutes a force-saving lever, making it more effortless when pushing the tool laterally.

[0012] Furthermore, a pair of fixed arms with identical structures are fixedly connected to the fixed frame, and the two fixed arms are rotatably connected to pry arms with identical structures. In use, one end of the two pry arms extends into the tool box and is tangent to the two cutter rings on the upper and lower surfaces of the hob, and the other end of the two pry arms is connected by a rod-shaped handle.

[0013] The advantages of the above technical solution are: the operator can easily rotate the pry bar by holding the handle, making operation convenient. It also ensures that both pry bars apply the same force to both ends of the cutter, guaranteeing that the net torque on the cutter is zero, thus facilitating uniform pushing of the cutter and preventing it from tilting.

[0014] Furthermore, the fixing frame has a planar frame structure, and its dimensions match the cross-sectional dimensions of the tool box; at least one fixing block is movably connected to the side of the fixing frame away from the fixing arm, and the fixing block fits tightly against the wall of the tool box during use.

[0015] The beneficial effects of the above technical solution are as follows: the shape of the fixing frame is similar to a rectangular planar frame structure. When in use, the fixing arm on one side and the fixing block on the other side of the fixing frame are closely fitted with the tool box wall, applying pressure in opposite directions to the tool box wall. The fixing frame is fixedly connected to the tool box wall by the static friction generated by the pressure on both sides.

[0016] Furthermore, the fixing frame is detachably connected to the tool box wall via a fixing block; the fixing frame is provided with bolts passing through its frame, the fixing block is fitted onto the outer wall of the bolt and slidably connected to the bolt, and a fixing handwheel is provided above the fixing block, which is threadedly connected to the bolt; the fixing handwheel is provided with anti-slip texture. Rotating the fixing handwheel can fix or separate the fixing block from the tool box wall.

[0017] Furthermore, the diameter of the cutter handwheel should be at least ten times the diameter of the spool. This reduces the operating force of the cutter handwheel to one-tenth or even less of the required pulling force, significantly saving effort.

[0018] Furthermore, two limiting blocks are fixedly connected to the bottom center of the pull claw, and the pull rope is fixed between the two limiting blocks. This restricts the lateral displacement of the pull rope, ensuring that the traction point of the pull rope on the pull claw is always located at the bottom of the pull claw.

[0019] Furthermore, the mounting bracket, fixing arm, pry arm, and mounting block are all made of high-strength aluminum alloy, making them lightweight. The entire machine weighs only 12-13KG, which can be easily lifted with one hand by an average person, making it convenient to carry. It will not deform or break during use.

[0020] Secondly, a method for using a TBM mechanical tool changer is provided, including the following steps:

[0021] S1. Adjust the direction of the pry bar until it can be smoothly inserted into the tool box;

[0022] S2. Adjust the pry arm so that the end of the pry arm that extends into the tool box contacts and is tangent to the tool ring; and place the fixing bracket at the tool box opening so that the contact part of the fixing arm contacts the side wall of the tool box.

[0023] S3. Rotate the fixed handwheel to move the fixed block and press it against the tool box wall. The fixed bracket is fixed at the tool box opening by the pressing force between the fixed block and the contact part against the side wall of the tool box.

[0024] S4. Manually insert the pull claw into the tool box in a direction perpendicular to the plane of the fixed frame, so that the pull claw clamps the hobbing cutter;

[0025] S5. Rotate the pry arm to push the hob to move laterally, so that the cutter shaft leaves the C-shaped block that limits the cutter shaft and is hooked by the pull claw hook head;

[0026] S6. Rotate the puller handwheel to drive the winding drum to rotate and retract the pull rope. The pull rope pulls the pull claw to move, and the pull claw hooks the cutter shaft and drives the roller cutter to move together to the cutter box opening.

[0027] S7. Loosen the fixing handwheel, remove the fixing bracket, and use the eye bolt to lift the hob away. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the TBM mechanical tool changer in use.

[0029] Figure 2 A schematic diagram of the mechanical tool changer in a TBM.

[0030] Figure 3 for Figure 2 A partially enlarged schematic diagram of the fixing block, bolts, fixing handwheel, and fixing frame;

[0031] Figure 4 This is a structural diagram of the fixing block, bolts, and fixing handwheel;

[0032] Figure 5 This is a schematic diagram illustrating the operating steps of a TBM mechanical tool changer.

[0033] Among them, 10, pry arm; 11, handle; 12, rotating shaft; 13, first arm; 14, second arm; 20, fixing frame; 21, fixing arm; 211, contact part; 212, extension part; 22, fixing block; 23, fixing handwheel; 24, mounting block; 25, bolt; 30, pull claw; 31, pull claw hook head; 32, limit block; 40, pull rope; 50, pull knife handwheel; 60, winding drum; 70, rolling cutter; 71, cutter shaft; 72, cutter ring; 80, cutter box. Detailed Implementation

[0034] The specific embodiments of the present invention are described below to enable those skilled in the art to understand the present invention. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, various changes are obvious as long as they are within the spirit and scope of the present invention as defined and determined by the appended claims. All inventions utilizing the concept of the present invention are protected.

[0035] In a first aspect, the present invention provides a TBM mechanical tool changer, such as Figure 1 and Figure 2 As shown, it includes a fixing bracket 20 detachably connected to the wall of the tool box 80. One end of the fixing bracket 20 is fixedly connected to a fixing arm 21, which fits tightly against the wall of the tool box 80 during use. The end of the fixing arm 21 is rotatably connected to a pry arm 10 via a rotating shaft 12. During use, the end of the pry arm 10 extends into the tool box 80 and contacts the cutter ring 72 of the hob 70. When in use, the fixing bracket 20 is fixed at the entrance of the tool box 80, and the operator does not need to hold the tool changing device continuously during the disassembly of the hob 70, which is more labor-saving.

[0036] A pair of mounting blocks 24 are fixedly connected to the mounting bracket 20. A pull handle 50 and a cable reel 60 are rotatably connected to the two mounting blocks 24 via the same shaft. A pull rope 40 is wound around the cable reel 60, and the end of the pull rope 40 away from the cable reel 60 is fixedly connected to the pull claw 30. The diameter of the pull handle 50 is at least ten times the diameter of the cable reel 60. This reduces the operating force of the pull handle 50 to 1 / 10 or even less of the required pulling force, significantly saving effort.

[0037] The pull claw 30 is a U-shaped rod. During use, the pull claw 30 clamps the upper and lower surfaces of the hob 70. Both free ends of the pull claw 30 are fixedly connected to pull claw hooks 31 for hooking the cutter shaft 71 of the hob 70. Two limiting blocks 32 are fixedly connected to the center of the bottom of the pull claw 30, and the pull rope 40 is fixed between the two limiting blocks 32. This limits the lateral displacement of the pull rope 40, ensuring that the traction point of the pull rope 40 on the pull claw 30 is always located at the bottom of the pull claw 30.

[0038] The cutter shafts 71 at both ends of the hob 70 are secured to the tool box 80 via C-blocks and bolts. The C-blocks and cutter shafts 71 engage tightly, providing a strong clamping force. A traditional pry bar is a long rod with pry heads fixed to both ends for prying the hob 70. After removing the bolts, the pry head is inserted as far as possible into the small gap between the C-block and the cutter shaft 71. Using the contact point between the tool box 80 wall and the pry bar as a fulcrum, lateral force is applied to push the cutter shaft 71 out of the C-block. Because the clamping force between the C-block and the cutter shaft 71 is very strong, this operation is extremely laborious. Furthermore, the gap between the C-block and the cutter shaft 71 is small, and the pry head, being of a certain thickness, cannot be inserted too deeply, making it difficult to find a leverage point. This results in the step of prying the cutter shaft 71 out of the C-block being very time-consuming and laborious, potentially taking anywhere from 30 minutes to 1 hour per operation.

[0039] The working principle of this invention is as follows: After removing the bolts, the operator places the hob 70 in the U-shaped pull claw 30, and extends the pry arm 10 into the tool box 80 at one end to contact the cutter ring 72 of the hob 70. By moving the other end of the pry arm 10, the cutter shaft 71 can be pushed out of the C-shaped block until the cutter shaft 71 is hooked by the pull claw hook head 31.

[0040] In summary, compared to traditional pry bars, the side-push method used in this invention provides excellent leverage and significantly reduces operational difficulty. Furthermore, rotating the pull-blade handwheel 50 drives the winding drum 60, which in turn moves the pull rope 40, pulling the pull claw 30. The pull claw hook 31 can then hook onto both ends of the blade shaft 71, greatly reducing the difficulty of removing the blade.

[0041] It is worth mentioning that, in existing technologies, besides mechanical tool changers, there are also pneumatic tool changers, which can save manpower to some extent. However, pneumatic tool changers have many application limitations, making workers in practical scenarios more willing to use the user-friendly mechanical tool changer rather than the pneumatic one. This invention also represents a significant improvement over pneumatic tool changers in certain aspects.

[0042] 1. Pneumatic tool changers have high requirements for the dimensional accuracy of the operating space. When the dimensional deviation of the operating space is large, it may not work properly. In addition, it requires an on-site air source, making it unsuitable for harsh working conditions. In contrast, this invention is a purely mechanical structure that can be used immediately without the need for an external air or power source. It is simple to operate and easy to maintain and repair.

[0043] 2. The pneumatic tool changer is large and heavy, with a minimum size of 1343*500*286mm. The cylinder alone weighs as much as 15KG, and the equipment weighs 25KG including the electrical box. It is inconvenient to carry and requires manual support during operation, making it cumbersome to use. In contrast, the present invention is lightweight, with a total equipment weight of only 12-13KG. It can be lifted by an ordinary person with one hand, making it convenient to carry. Moreover, it does not require manual support during operation, saving more effort.

[0044] 3. When the pneumatic tool changer is side-mounted, it needs to move with the tool. The hob 70 is only subjected to force on one side, which will generate an eccentric bending moment. It needs to be manually counteracted, and the operation process is relatively laborious. When the pneumatic tool changer is side-mounted, the double prying arms 10 apply force to the upper and lower cutter rings 71 of the hob 70 at the same time. This will not generate an eccentric bending moment, nor will it require manual counteracting. The operation is simpler and smoother.

[0045] 4. Compared with the pneumatic tool changer, this device has a lower cost, with a batch cost of less than 1,000 yuan, making it easy to promote and apply. Moreover, this device has a simple structure and does not require high motion control precision. Compared with the pneumatic tool changer, it does not have the problem of jamming during the motion process and has a low failure rate.

[0046] Specifically, the fixed arm 21 includes a contact portion 211 and an extension portion 212. During use, the contact portion 211 fits tightly against the wall of the tool box 80, while the extension portion 212 is triangular and does not contact the wall of the tool box 80. The rotating shaft 12 is located at the tip of the extension portion 212. This design increases the movable space of the pry arm 10 within the tool box 80. Using the extension line of the rotating shaft 12 as a dividing line, the pry arm 10 is divided into a first arm 13 and a second arm 14. The length of the first arm 13 is greater than the length of the second arm 14. The pry arm 10 constitutes a force-saving lever, making it more effortless to push the tool laterally.

[0047] This invention achieves maximum mechanical labor saving through the optimized structural design of the tool changing device. The fixed arm 21 is provided with a contact part 211 to ensure a tight connection with the tool box 80, and the extension part 212 is provided to position the rotating shaft 12 as close as possible to the end of the second arm 14, thereby extending the length of the first arm 13 and reducing the length of the second arm 14.

[0048] According to the lever principle, the effort arm is the perpendicular distance between the effort and the rotation axis 12, and the resistance arm is the perpendicular distance between the resistance and the rotation axis 12. When the directions of the effort and resistance are perpendicular to the first arm 13 and the second arm 14, respectively, the length from the end of the first arm 13 to the rotation axis 12 is the length of the effort arm, and the length from the end of the second arm 14 to the rotation axis 12 is the length of the resistance arm. Therefore, the longer the first arm 13 and the shorter the second arm 14, the more significant the effort-saving effect. The length of the first arm 13 can be set to 7 to 8 times the length of the second arm 14. When pushing the blade laterally, the Newtonian force applied manually can be amplified by 7 to 8 times or more, resulting in a significant effort-saving effect. At the initial position, the length of the resistance arm is the shortest, and the force of the effort-saving lever is maximized.

[0049] In one embodiment of the present invention, a pair of fixed arms 21 with the same structure are preferably fixedly connected to the fixed frame 20, and the two fixed arms 21 are respectively rotatably connected to pry arms 10 with the same structure; in use, one end of the two pry arms 10 extends into the cutter box 80 and is tangent to the two cutter rings 72 on the upper and lower surfaces of the hob 70, and the other end of the two pry arms 10 is connected by a rod-shaped handle 11, which is perpendicular to the two pry arms 10.

[0050] The operator can easily rotate the pry bar 10 by holding the handle 11. It also ensures that the two pry bars 10 apply the same force to both ends of the roller cutter 70, ensuring that the resultant torque on the roller cutter 70 is zero, so as to push the roller cutter 70 evenly and prevent the roller cutter 70 from tilting or moving.

[0051] like Figure 3 and Figure 4 As shown, the fixing frame 20 has a planar frame structure, and its dimensions match the cross-sectional dimensions of the tool box 80. At least one fixing block 22 is movably connected to the side of the fixing frame 20 away from the fixing arm 21. In use, the fixing block 22 is in close contact with the wall of the tool box 80. The shape of the fixing frame 20 is similar to a rectangular planar frame structure. In use, the fixing arm 21 on one side of the fixing frame 20 and the fixing block 22 on the other side are both in close contact with the wall of the tool box 80, applying pressure in opposite directions to the wall of the tool box 80. The fixing frame 20 is fixedly connected to the wall of the tool box 80 by the static friction generated by the pressure on both sides.

[0052] After the fixed connection, the operator no longer needs to hold the tool changing device by hand, and the fulcrum of the pry arm 10 (i.e., the rotating shaft 12) is thus fixed. Traditional pry bars use the contact point between the tool box 80 wall and the pry bar as the fulcrum; only by finding this fulcrum can the roller cutter 70 be pried. However, due to limitations in the size of the gap and the thickness of the pry bar, it is difficult for the pry bar to reach into the gap between the C-block and the tool shaft 71, often making it difficult to find the fulcrum and thus difficult to pry the roller cutter 70. However, the structural design of this invention is equivalent to setting a fixed fulcrum for the pry arm 10; simply turning the handle 11 rotates the pry arm 10 and pries the roller cutter 70, greatly reducing the difficulty of operation.

[0053] Secondly, by pushing the roller cutter 70 laterally, the roller cutter 70 disengages from the C-block, and at the same time, the cutter shaft 71 can engage with the pull claw hook head 31, allowing it to be pulled and moved by the pull rope 40. This eliminates the need for the cumbersome process of attaching the pull rope 40 to the roller cutter 70. Furthermore, compared to directly pulling the roller cutter 70 with the pull rope 40, the pull handwheel 50 significantly reduces the operating force, resulting in a noticeable labor-saving effect. This invention, through the coordination of its structures, perfectly solves the pain points of traditional crowbars: difficulty in finding a leverage point, cumbersome rope attachment, and high labor intensity during pulling, representing a significant improvement over traditional mechanical cutter changing devices.

[0054] The mounting bracket 20 is detachably connected to the wall of the tool box 80 via a fixing block 22. The mounting bracket 20 has bolts 25 passing through its frame. The fixing block 22 is fitted onto the outer wall of the bolts 25 and slidably connected to them. A fixing handwheel 23, threadedly connected to the bolts 25, is located above the fixing block 22; the fixing handwheel 23 has anti-slip texture. Rotating the fixing handwheel 23 allows the fixing block 22 to be fixedly connected to or detached from the wall of the tool box 80.

[0055] When the fixing handwheel 23 is not engaged with the bolt 25, the fixing block 22 can move along the bolt 25. When installing the mounting bracket 20, the fixing handwheel 23 can be rotated until both the fixing block 22 and the fixing arm 21 are in close contact with the wall of the tool box 80. When disassembling the mounting bracket 20, the fixing handwheel 23 is rotated in the opposite direction to loosen it, allowing the fixing block 22 to move in the opposite direction along the bolt 25. The fixing block 22 is no longer in close contact with the wall of the tool box 80, and the mounting bracket 20 can be removed. Preferably, there are two fixing blocks 22. The fixing handwheel 23 needs to be turned to make the fixing block 22 in close contact with the wall of the tool box 80. This ensures that the force on the wall of the tool box 80 is even while minimizing the number of times the fixing handwheel 23 needs to be turned, thus reducing the operation time required to install the mounting bracket 20.

[0056] Preferably, the fixing frame 20, fixing arm 21, pry arm 10, and mounting block 24 are all made of high-strength aluminum alloy, which is lightweight, with the entire machine weighing only 12-13KG, making it easy for ordinary people to lift with one hand and carry. The structures of the above four components have all undergone topology optimization, so they will not deform or break during use. Wear-resistant steel plates are set in the contact wear-prone areas, which can effectively improve the contact service life of the structural components. The pull rope 40 is preferably made of ultra-high molecular weight polyethylene fiber, which is one of the three major high-performance fibers in the world today. It has the characteristics of high tensile strength, low elongation, high modulus, light specific gravity, acid and alkali resistance, corrosion resistance, and aging resistance, and is lighter than steel wire.

[0057] Secondly, the present invention provides a method for using a TBM mechanical tool changer, comprising the following steps:

[0058] S1. Adjust the direction of the pry arm 10 until the pry arm 10 is smoothly inserted into the tool box 80.

[0059] S2. Adjust the pry arm 10 so that one end of the pry arm 10 extends into the tool box 80 and contacts and is tangent to the tool ring 72; and place the fixing bracket 20 at the opening of the tool box 80 so that the contact part 211 of the fixing arm 21 contacts the side wall of the tool box 80.

[0060] S3. Rotate the fixed handwheel 23 to move the fixed block 22 to press against the wall of the tool box 80, and fix the fixed frame 20 at the opening of the tool box 80 by the pressing force of the fixed block 22 and the contact part 211 against the side wall of the tool box 80.

[0061] S4. Manually insert the pull claw 30 into the tool box 80 in a direction perpendicular to the plane of the fixed frame 20, so that the pull claw 30 clamps the hob 70; to prevent the pull claw 30 from shifting and separating from the hob 70 when the pull rope 40 pulls back the pull claw 30.

[0062] S5. Rotate the pry arm 10 to push the hob 70 to move laterally, so that the cutter shaft 71 leaves the C-shaped block that limits the cutter shaft 71 and is hooked by the pull claw hook head 31 (S1-S5 can be referenced). Figure 5 );

[0063] S6. Rotate the puller handwheel 50 to drive the winding drum 60 to rotate and retract the pull rope 40. The pull rope 40 pulls the pull claw 30 to move. The pull claw hook 31 hooks the cutter shaft 71 and drives the roller cutter 70 to move together to the cutter box 80.

[0064] S7. Loosen the fixing handwheel 23, remove the fixing bracket 20, and use the eye bolt to lift the hob 70 away.

[0065] In summary, the tool changing device of the present invention has a definite fulcrum, which greatly reduces the difficulty of lateral tool lifting operation, and is equipped with a pull claw and a force-saving mechanism for pulling the tool, making the tool pulling operation more convenient and labor-saving.

Claims

1. A TBM mechanical tool changer, characterized in that: It includes a fixing frame (20) detachably connected to the wall of the tool box (80), one end of which is fixedly connected to a fixing arm (21). When in use, the fixing arm (21) is in close contact with the wall of the tool box (80). The end of the fixing arm (21) is rotatably connected to a pry arm (10) via a rotating shaft (12). When in use, one end of the pry arm (10) extends into the inside of the tool box (80) and contacts the cutter ring (72) of the hob (70). A pair of mounting blocks (24) are fixedly connected to the fixed frame (20). A pull knife handwheel (50) and a winding drum (60) are rotatably connected to the two mounting blocks (24) via the same shaft. A pull rope (40) is wound on the winding drum (60). The end of the pull rope (40) away from the winding drum (60) is fixedly connected to the pull claw (30). The pull claw (30) is a U-shaped rod. When in use, the pull claw (30) clamps the upper and lower surfaces of the hob (70). Both free ends of the pull claw (30) are fixedly connected to the pull claw hook head (31) for hooking the cutter shaft (71) of the hob (70). The fixed arm (21) includes a contact part (211) and an extension part (212). When in use, the contact part (211) is in close contact with the wall of the tool box (80), and the extension part (212) is triangular and does not contact the wall of the tool box (80). The rotating shaft (12) is located at the tip of the extension part (212). The pry arm (10) is divided into a first arm (13) and a second arm (14) by the extension line of the rotating shaft (12). The length of the first arm (13) is greater than the length of the second arm (14).

2. The TBM mechanical tool changer according to claim 1, characterized in that: A pair of fixed arms (21) with the same structure are fixedly connected to the fixed frame (20). The two fixed arms (21) are respectively rotatably connected to pry arms (10) with the same structure. When in use, one end of the two pry arms (10) extends into the cutter box (80) and is tangent to the two cutter rings (72) on the upper and lower surfaces of the hob (70). The other end of the two pry arms (10) is connected by a rod-shaped handle (11).

3. The TBM mechanical tool changer according to claim 1, characterized in that: The fixing frame (20) has a planar frame structure, and its size matches the cross-sectional size of the tool box (80). At least one fixing block (22) is movably connected to the side of the fixing frame (20) away from the fixing arm (21). When in use, the fixing block (22) fits tightly against the wall of the tool box (80).

4. The TBM mechanical tool changer according to claim 3, characterized in that: The fixing frame (20) is detachably connected to the wall of the tool box (80) via the fixing block (22); the fixing frame (20) is provided with a bolt (25) passing through its frame, the fixing block (22) is sleeved on the outer wall of the bolt (25) and slidably connected with the bolt (25), and a fixing handwheel (23) is provided above the fixing block (22) and threadedly connected to the bolt (25); the fixing handwheel (23) is provided with anti-slip texture.

5. The TBM mechanical tool changer according to claim 1, characterized in that: The diameter of the puller handwheel (50) is at least ten times the diameter of the spool (60).

6. The TBM mechanical tool changer according to claim 1, characterized in that: Two limiting blocks (32) are fixedly connected to the bottom center of the pull claw (30), and the pull rope (40) is fixed between the two limiting blocks (32).

7. The TBM mechanical tool changer according to claim 1, characterized in that: The fixing frame (20), fixing arm (21), pry arm (10), and mounting block (24) are all made of high-strength aluminum alloy.

8. A method of using the TBM mechanical tool changer according to any one of claims 1-7, characterized in that, Includes the following steps: S1. Adjust the direction of the pry bar (10) until the pry bar (10) is smoothly inserted into the tool box (80); S2. Adjust the pry bar (10) so that one end of the pry bar (10) extends into the tool box (80) and contacts the tool ring (72) and is tangent to the tool ring (72); and place the fixing bracket (20) at the opening of the tool box (80) so that the contact part (211) of the fixing arm (21) contacts the side wall of the tool box (80); S3. Rotate the fixed handwheel (23) to move the fixed block (22) to press against the wall of the tool box (80), and fix the fixed frame (20) at the opening of the tool box (80) by the pressing force of the fixed block (22) and the contact part (211) against the side wall of the tool box (80); S4. Manually insert the pull claw (30) into the tool box (80) in a direction perpendicular to the plane of the fixed frame (20) so that the pull claw (30) clamps the hob (70). S5. Rotate the pry bar (10) to push the hob (70) to move laterally, and the cutter shaft (71) leaves the C-shaped block that limits the cutter shaft (71) and is hooked by the pull claw hook (31); S6. Rotate the puller handwheel (50) to drive the winding drum (60) to rotate and retract the pull rope (40). The pull rope (40) pulls the pull claw (30) to move. The pull claw hook (31) hooks the cutter shaft (71) and drives the roller cutter (70) to move together to the cutter box (80) opening. S7. Loosen the fixed handwheel (23), remove the fixed bracket (20), and use the eye bolt to lift the hob (70) away.

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