Stay cable cutting and dismantling device and method

Abstract

The invention belongs to the technical field of stay cable cutting, and discloses a stay cable cutting and dismantling device and method.The stay cable cutting and dismantling device comprises a mounting frame, an extending frame is fixed to the exterior of the mounting frame, a connecting frame is fixed to the interior of a cutting ring, an air cylinder is fixed to the top end of the connecting frame, a walking mechanism is arranged at the top end of the mounting frame, and a positioning mechanism is arranged in the mounting frame; through cooperation of structures such as a first connecting base, a first walking wheel and a second servo motor, the device can start the second servo motor to drive the first walking wheel to rotate, so that the first walking wheel makes contact with the inner wall of the rope sling and walks in the rope sling through friction force; and an inner tooth conveying belt can drive a second walking wheel to synchronously rotate and walk along with a first walking wheel, the friction force is improved, the advancing stability is enhanced, the whole device can advance on the stay cable, and therefore the cutting effect is guaranteed, and the purpose that the device can conveniently cut and dismantle the high-end stay cable is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of stay cable cutting, and specifically relates to a cutting and demolition device and method for stay cables. Background Art

[0002] With the acceleration of the urbanization process, a large number of cable-stayed bridges have been built. However, over time, the stay cables of these bridges will experience problems such as aging and corrosion, and need to be regularly inspected and replaced.

[0003] Traditional methods for cutting and demolishing stay cables mostly rely on manual operations, which are inefficient and have poor safety, and are prone to accidents. In recent years, although some automated devices have emerged, there are still many problems in actual applications, and it is impossible to cut and demolish the connections at high positions of stay cables.

[0004] By setting up a traveling mechanism, the efficiency of cutting and demolishing stay cables is improved, the manual participation is reduced, the construction time and cost are lowered, and the cutting safety is increased to ensure the stability and accuracy of the cutting process. Summary of the Invention

[0005] To solve the problems raised in the above background art, the present invention provides a cutting and demolition device and method for stay cables.

[0006] To achieve the above object, the present invention provides the following technical solution: A cutting and demolition device for stay cables, including a mounting frame, an extension frame is fixed outside the mounting frame, a cutting ring is rotatably connected inside the extension frame, a connecting frame is fixed inside the cutting ring, a cylinder is fixed at the top of the connecting frame, a disassembly and assembly mechanism is installed at the bottom end of the cylinder, a traveling mechanism is arranged at the top of the mounting frame, and a positioning mechanism is arranged inside the mounting frame; The disassembly and assembly mechanism includes a connecting block and a limiting block, the connecting block is fixed at the telescopic end of the cylinder, and a limiting block is fixed outside the connecting block; The traveling mechanism includes a first connecting seat and a first traveling wheel, the first connecting seat is fixed at the top of the mounting frame, and the first traveling wheel is movably connected inside the first connecting seat; The positioning mechanism includes a first limiting frame and a first driven wheel, the first limiting frame is slidably connected inside the mounting frame, and a first driven wheel is rotatably connected at one end of the first limiting frame.

[0007] Preferably, a limiting member is fixed inside the limiting block, a limiting seat is threadedly connected inside the limiting block, a limiting disk is fixed outside the limiting seat, a limiting rod is inserted inside the limiting disk, and a cutting blade is fixed outside the limiting rod.

[0008] Preferably, jack holes are provided at one ends of the connecting block, the limiting disc and the limiting seat, and the diameter of the limiting rod is equal to the diameter of the jack hole.

[0009] Preferably, an inclined groove is provided on the surface of the limiting member, a slope is provided at one end of the limiting seat, and the diameter of the limiting disc is smaller than the diameter of the cutting disc.

[0010] Preferably, a second servo motor is fixed to the outside of the first connecting seat, an internal gear conveyor belt is sleeved on the outer wall of the first traveling wheel, a second connecting seat is fixed to the top end of the mounting frame, and a second traveling wheel is movably connected inside the second connecting seat.

[0011] Preferably, a first traveling wheel is fixed to the output end of the second servo motor, a transmission gear meshing with the internal gear conveyor belt is fixedly sleeved on the central axes of the second traveling wheel and the second traveling wheel, two groups of the first connecting seats are symmetrically distributed about the central axis of the mounting frame, two groups of the second connecting seats are symmetrically distributed about the central axis of the mounting frame, and the first traveling wheel and the second traveling wheel are symmetrically distributed about the central axis of the mounting frame.

[0012] Preferably, a return spring is fixed to one end of the first limiting frame, a second limiting frame is fixed to one end of the return spring, and a second driven wheel is rotatably connected to one end of the second limiting frame.

[0013] Preferably, two groups of the first limiting frames are symmetrically distributed about the central axis of the mounting frame, the first limiting frame is slidably connected to the mounting frame, two groups of the second limiting frames are symmetrically distributed about the central axis of the mounting frame, the second limiting frame is slidably connected to the mounting frame, the first driven wheel and the second driven wheel are symmetrically distributed about the central axis of the mounting frame, and the return spring is used to squeeze the first limiting frame and the second limiting frame and keep them in a tendency of moving outward.

[0014] Preferably, a first servo motor is fixed to the outside of the extension frame, a gear is fixed to the output end of the first servo motor, the gear is meshed with the cutting ring, there are four groups of connecting frames, and the connecting frames are equidistantly distributed about the central axis of the cutting ring.

[0015] The present invention also provides a method for cutting and removing stay cables, comprising the following steps: S1. After cutting the bottom of the bridge deck stay cable to be replaced, the whole device is sleeved on the stay cable and the cutting end is re-tightened. At this time, the first traveling wheel, the second traveling wheel, the first driven wheel and the second driven wheel of the device come into contact with the inner wall of the cable sleeve; S2. Start the second servo motor to drive the first walking wheel to rotate, so that the first walking wheel contacts the inner wall of the cable socket and walks inside it through friction. The inner tooth conveyor belt can drive the second walking wheel to rotate and walk synchronously with the first walking wheel, increasing the friction and enhancing the stability of the movement. S3. At the same time, after the first driven wheel and the second driven wheel are extruded by the return spring, the contact area with the inner wall of the cable socket can be ensured, thereby increasing the friction. And through the extrusion of the return spring, the device can be kept between the cable socket and the stay cable, ensuring the stability of subsequent cutting and movement. S4. When the whole device moves to the top of the stay cable, start the first servo motor to drive the gear to rotate. Then, drive the whole cutting ring to rotate through the shape of the gear, so that the cutting blade rotates with the cutting ring. Then, control the position of the cutting blade to move down through the cylinder, so as to cut the stay cable in the middle of the device. After the cutting is completed, the stay cable slides out and is removed through the cable socket. Just start the second servo motor to reverse to take out the device. S5. After the device has been in long-term use, the cutting blade will wear. Rotate the limit disk so that the inclined surface of the limit seat is separated from the contact with the limiting part, so that the limiting part no longer limits the limiting rod. Then remove the cutting blade. After taking out a new cutting blade, align the limiting rod with the jacks of the cutting blade and the limiting part and insert it. Rotate the limit disk so that the whole position of the limit seat moves down inside the limit block and simultaneously extrudes the limiting part, causing the limiting part to contract, and then lock the limiting rod, completing the replacement of the cutting blade.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: Through the cooperation of structures such as the first connecting seat, the first walking wheel, and the second servo motor, the present invention enables the device to start the second servo motor to drive the first walking wheel to rotate, so that the first walking wheel contacts the inner wall of the cable socket and walks inside it through friction. The inner tooth conveyor belt can drive the second walking wheel to rotate and walk synchronously with the first walking wheel, increasing the friction and enhancing the stability of the movement. This enables the whole device to move on the stay cable, thereby ensuring the cutting effect, so as to achieve the purpose of facilitating the device to cut and remove high-end stay cables.

[0017] Through the cooperation of structures such as the first limit frame, the first driven wheel, and the return spring, the present invention enables the device to ensure the contact area with the inner wall of the cable socket after the first driven wheel and the second driven wheel are extruded by the return spring, thereby increasing the friction. And through the extrusion of the return spring, the device can be kept between the cable socket and the stay cable, preventing the device from shifting in position during the movement process, so as to achieve the purpose of facilitating the device to maintain the movement position.

[0018] The present invention cooperates with structures such as a connecting block, a limit block, and a limit piece so that when the device needs to replace the cutting blade, a new cutting blade can be taken out, the limit rod can be aligned with the insertion holes of the cutting blade and the limit piece and inserted, and the limit plate can be rotated so that the overall position of the limit seat moves downward inside the limit block and then the limit piece is squeezed synchronously, so that the limit piece contracts and then the limit rod is locked to complete the replacement of the cutting blade. Furthermore, the limit plate is rotated so that the inclined surface of the limit seat is separated from the contact with the limit piece, so that the limit piece no longer limits the limit rod, and then the cutting blade is removed, thereby completing the rapid disassembly and replacement of the cutting blade, thereby achieving the purpose of facilitating the device to maintain cutting efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the overall explosion structure of the present invention; Figure 3 It is a schematic diagram of the overall exploded right view structure of the present invention; Figure 4 It is a schematic diagram of the structure of the cutting assembly of the present invention; Figure 5 It is a schematic diagram of the cutting assembly of the present invention from the right side; Figure 6 It is a schematic diagram of the structure of the cutting piece of the present invention; Figure 7 For the present invention Figure 6 A partial cross-section at the center is an enlarged structural diagram; Figure 8 It is a schematic diagram of the explosion structure of the disassembly and assembly mechanism of the present invention; Figure 9 It is a schematic diagram of the structure of the walking mechanism of the present invention; Figure 10 It is a schematic diagram of the positioning mechanism structure of the present invention.

[0020] In the figure: 1. mounting frame; 2. extension frame; 3. cutting ring; 4. first servo motor; 5. gear; 6. connecting frame; 7. cylinder; 8. disassembly and assembly mechanism; 801. connecting block; 802. limiting block; 803. limiting member; 804. limiting plate; 805. limiting seat; 806. cutting disc; 807. limiting rod; 9. walking mechanism; 901. first connecting seat; 902. first walking wheel; 903. second servo motor; 904. internal tooth conveyor belt; 905. second walking wheel; 906. second connecting seat; 10. positioning mechanism; 1001. first limiting frame; 1002. first driven wheel; 1003. reset spring; 1004. second limiting frame; 1005. second driven wheel. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0022] As Figures 1 to 10 shown, the present invention provides a cutting and removing device for stay cables, including a mounting frame 1. An extension frame 2 is fixed to the outside of the mounting frame 1. A cutting ring 3 is rotatably connected to the inside of the extension frame 2. A connecting frame 6 is fixed to the inside of the cutting ring 3. A cylinder 7 is fixed to the top end of the connecting frame 6. A disassembly and assembly mechanism 8 is installed at the bottom end of the cylinder 7. A traveling mechanism 9 is arranged at the top end of the mounting frame 1. A positioning mechanism 10 is arranged inside the mounting frame 1. A first servo motor 4 is fixed to the outside of the extension frame 2. A gear 5 is fixed to the output end of the first servo motor 4. The gear 5 is meshed with the cutting ring 3. There are four groups of connecting frames 6, and the connecting frames 6 are equally spaced about the central axis of the cutting ring 3.

[0023] Adopting the above solution: By starting the first servo motor 4, the gear 5 is driven to rotate, and then the cutting ring 3 is driven to rotate integrally through the shape of the gear 5, so that the cutting blade 806 rotates along with the cutting ring 3. Furthermore, the position of the cutting blade 806 is controlled to move downward by the cylinder 7, so as to cut the stay cable in the middle of the device. After the cutting is completed, the stay cable slides out and is removed through the cable sleeve. By starting the second servo motor 903 to reverse, the device can be taken out.

[0024] As Figures 1 to 10 shown, the disassembly and assembly mechanism 8 includes a connecting block 801 and a limiting block 802. The connecting block 801 is fixed to the telescopic end of the cylinder 7. A limiting block 802 is fixed to the outside of the connecting block 801. A limiting member 803 is fixed to the inside of the limiting block 802. A limiting seat 805 is threadedly connected to the inside of the limiting block 802. A limiting disc 804 is fixed to the outside of the limiting seat 805. A limiting rod 807 is inserted into the inside of the limiting disc 804. A cutting blade 806 is fixed to the outside of the limiting rod 807. One ends of the connecting block 801, the limiting disc 804 and the limiting seat 805 are provided with jacks. The diameter of the limiting rod 807 is equal to the diameter of the jacks. An inclined groove is provided on the surface of the limiting member 803. A slope is provided at one end of the limiting seat 805. The diameter of the limiting disc 804 is smaller than the diameter of the cutting blade 806.

[0025] As Figures 1 to 10As shown in the figure, the traveling mechanism 9 includes a first connecting seat 901 and a first traveling wheel 902. The first connecting seat 901 is fixed to the top end of the mounting frame 1. A first traveling wheel 902 is rotatably connected inside the first connecting seat 901. A second servo motor 903 is fixed to the outside of the first connecting seat 901. An internal tooth conveyor belt 904 is sleeved on the outer wall of the first traveling wheel 902. A second connecting seat 906 is fixed to the top end of the mounting frame 1. A second traveling wheel 905 is rotatably connected inside the second connecting seat 906. The output end of the second servo motor 903 is fixed to the first traveling wheel 902. Transmission gears meshing with the internal tooth conveyor belt 904 are fixedly sleeved on the central axes of the second traveling wheel 905 and the second traveling wheel 902. Two groups of first connecting seats 901 are symmetrically distributed about the central axis of the mounting frame 1. Two groups of second connecting seats 906 are symmetrically distributed about the central axis of the mounting frame 1. The first traveling wheel 902 and the second traveling wheel 905 are symmetrically distributed about the central axis of the mounting frame 1.

[0026] As Figures 1 to 10 As shown in the figure, the positioning mechanism 10 includes a first limiting frame 1001 and a first driven wheel 1002. The first limiting frame 1001 is slidably connected inside the mounting frame 1. A first driven wheel 1002 is rotatably connected to one end of the first limiting frame 1001. A return spring 1003 is fixed to one end of the first limiting frame 1001. A second limiting frame 1004 is fixed to one end of the return spring 1003. A second driven wheel 1005 is rotatably connected to one end of the second limiting frame 1004. Two groups of first limiting frames 1001 are symmetrically distributed about the central axis of the mounting frame 1. The first limiting frame 1001 is slidably connected to the mounting frame 1. Two groups of second limiting frames 1004 are symmetrically distributed about the central axis of the mounting frame 1. The second limiting frame 1004 is slidably connected to the mounting frame 1. The first driven wheel 1002 and the second driven wheel 1005 are symmetrically distributed about the central axis of the mounting frame 1. The return spring 1003 is used to squeeze the first limiting frame 1001 and the second limiting frame 1004 and keep them in a tendency of moving outwards.

[0027] The present invention also provides a method for cutting and removing a stay cable, including the following steps: S1. After cutting off the bottom of the stay cable of the bridge deck to be replaced, the whole device is sleeved on the stay cable, and the cutting end is re-tightened. At this time, the first traveling wheel 902, the second traveling wheel 905, the first driven wheel 1002, and the second driven wheel 1005 of the device contact the inner wall of the cable sleeve. S2. Start the second servo motor 903 to drive the first traveling wheel 902 to rotate, so that the first traveling wheel 902 contacts the inner wall of the cable sleeve and travels inside it through friction. The internal tooth conveyor belt 904 can drive the second traveling wheel 905 to rotate and travel synchronously with the first traveling wheel 902, improving the friction and enhancing the stability of the travel. S3, after being squeezed by the return spring 1003, the first driven wheel 1002 and the second driven wheel 1005 can ensure the contact area with the inner wall of the cable sleeve, thereby increasing the friction force, and the device can be kept between the cable sleeve box and the inclined cable by squeezing the return spring 1003, ensuring the stability of subsequent cutting and travel; S4, when the device as a whole moves to the top of the inclined cable, the first servo motor 4 is started to drive the gear 5 to rotate, and then the shape of the gear 5 drives the cutting ring 3 to rotate as a whole, so that the cutting blade 806 rotates along with the cutting ring 3, and then the position of the cutting blade 806 is controlled to move downward by the cylinder 7, so as to cut the inclined cable in the middle of the device, and after the cutting is completed, the inclined cable is removed by sliding out through the cable sleeve, and the second servo motor 903 is started to reverse and the device can be taken out; S5. After the device has been in use for a long time, the cutting blade 806 will be worn out. The limit plate 804 is rotated to make the inclined surface of the limit seat 805 disengage from the contact with the limit member 803, so that the limit member 803 no longer limits the limit rod 807. Then, the cutting blade 806 is removed. After taking out the new cutting blade 806, the limit rod 807 is aligned with the insertion holes of the cutting blade 806 and the limit member 803 and inserted. The limit plate 804 is rotated to make the overall position of the limit seat 805 move downward inside the limit block 802, and then the limit member 803 is squeezed synchronously, so that the limit member 803 shrinks, and then the limit rod 807 is locked, and the replacement of the cutting blade 806 is completed.

[0028] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cutting and demolition device for stay cables, comprising a mounting frame (1), characterized in that: An extension frame (2) is fixed to the outside of the mounting frame (1). A cutting ring (3) is rotatably connected inside the extension frame (2). A connecting frame (6) is fixed inside the cutting ring (3). A cylinder (7) is fixed to the top end of the connecting frame (6). A disassembly and assembly mechanism (8) is installed at the bottom end of the cylinder (7). A traveling mechanism (9) is arranged at the top end of the mounting frame (1). A positioning mechanism (10) is arranged inside the mounting frame (1). The disassembly and assembly mechanism (8) includes a connecting block (801) and a limiting block (802). The connecting block (801) is fixed to the telescopic end of the cylinder (7). The limiting block (802) is fixed to the outside of the connecting block (801). The traveling mechanism (9) includes a first connecting seat (901) and a first traveling wheel (902). The first connecting seat (901) is fixed to the top end of the mounting frame (1). The first traveling wheel (902) is movably connected inside the first connecting seat (901). The positioning mechanism (10) includes a first limiting frame (1001) and a first driven wheel (1002). The first limiting frame (1001) is slidably connected inside the mounting frame (1). A first driven wheel (1002) is rotatably connected to one end of the first limiting frame (1001).

2. The cutting and demolition device for stay cables according to claim 1, characterized in that: A limiting member (803) is fixed inside the limiting block (802). A limiting seat (805) is threadedly connected inside the limiting block (802). A limiting disc (804) is fixed to the outside of the limiting seat (805). A limiting rod (807) is inserted inside the limiting disc (804). A cutting blade (806) is fixed to the outside of the limiting rod (807).

3. The cutting and removing device for stay cables according to claim 2, characterized in that: One ends of the connecting block (801), the limiting disc (804) and the limiting seat (805) are provided with insertion holes. The diameter of the limiting rod (807) is equal to the diameter of the insertion holes.

4. The cutting and demolition device for stay cables according to claim 2, characterized in that: The surface of the limiting member (803) is provided with an inclined groove. One end of the limiting seat (805) is provided with a slope. The diameter of the limiting disc (804) is smaller than the diameter of the cutting blade (806).

5. The cutting and removing device for stay cables according to claim 1, characterized in that: A second servo motor (903) is fixed to the outside of the first connecting seat (901). An internal tooth conveyor belt (904) is sleeved on the outer wall of the first traveling wheel (902). A second connecting seat (906) is fixed to the top end of the mounting frame (1). A second traveling wheel (905) is movably connected inside the second connecting seat (906).

6. The cutting and removing device for stay cables according to claim 5, wherein: The output end of the second servo motor (903) is fixed to the first traveling wheel (902). Transmission gears meshing with the internal tooth conveyor belt (904) are fixedly sleeved on the central axes of the second traveling wheel (905) and the first traveling wheel (902). Two groups of the first connecting seats (901) are symmetrically distributed about the central axis of the mounting frame (1). Two groups of the second connecting seats (906) are symmetrically distributed about the central axis of the mounting frame (1). The first traveling wheel (902) and the second traveling wheel (905) are symmetrically distributed about the central axis of the mounting frame (1).

7. The cutting and demolition device for stay cables according to claim 1, characterized in that: One end of the first limiting frame (1001) is fixed with a return spring (1003). One end of the return spring (1003) is fixed with a second limiting frame (1004). One end of the second limiting frame (1004) is rotatably connected with a second driven wheel (1005).

8. The cutting and demolition device for stay cables according to claim 7, characterized in that: There are two groups of the first limiting frames (1001) symmetrically distributed about the central axis of the mounting frame (1). The first limiting frame (1001) is slidably connected with the mounting frame (1). There are two groups of the second limiting frames (1004) symmetrically distributed about the central axis of the mounting frame (1). The second limiting frame (1004) is slidably connected with the mounting frame (1). The first driven wheel (1002) and the second driven wheel (1005) are symmetrically distributed about the central axis of the mounting frame (1). The return spring (1003) is used to squeeze the first limiting frame (1001) and the second limiting frame (1004) and keep them in a trend of moving outwards.

9. The cutting and demolition device for stay cables according to claim 1, characterized in that: A first servo motor (4) is fixed to the outside of the extension frame (2). The output end of the first servo motor (4) is fixed with a gear (5). The gear (5) is meshed and connected with the cutting ring (3). There are four groups of connecting frames (6), and the connecting frames (6) are equidistantly distributed about the central axis of the cutting ring (3).

10. A method for cutting and removing stay cables, which uses a device for cutting and removing stay cables as described in any one of claims 1-9, characterized in that: Including the following steps: S1. After cutting off the bottom of the bridge cable-stayed cable to be replaced, the whole device is sleeved on the cable-stayed cable, and the cutting end is tightened again. At this time, the first traveling wheel (902), the second traveling wheel (905), the first driven wheel (1002) and the second driven wheel (1005) of the device contact the inner wall of the cable sleeve. S2. Start the second servo motor (903) to drive the first traveling wheel (902) to rotate, so that the first traveling wheel (902) contacts the inner wall of the cable sleeve and travels inside it through friction. The second traveling wheel (905) can be driven to rotate and travel synchronously with the first traveling wheel (902) through the arranged internal tooth conveyor belt (904), improving the friction and enhancing the stability of the travel. S3. At the same time, after the first driven wheel (1002) and the second driven wheel (1005) are squeezed by the return spring (1003), the contact area with the inner wall of the cable sleeve can be guaranteed, thereby improving the friction. And through the extrusion of the return spring (1003), the device can be kept between the cable sleeve and the cable-stayed cable, ensuring the stability of subsequent cutting and travel. S4. When the whole device moves to the top of the cable-stayed cable, start the first servo motor (4) to drive the gear (5) to rotate. Then, drive the whole cutting ring (3) to rotate through the shape of the gear (5), so that the cutting blade (806) rotates following the cutting ring (3). Furthermore, control the position of the cutting blade (806) to move downwards through the cylinder (7), so as to cut the cable-stayed cable in the middle of the device. After the cutting is completed, the cable-stayed cable slides out and is removed through the cable sleeve. Start the second servo motor (903) to reverse to take out the device. S5. After the device has been in long-term use, the cutting disc (806) will wear out. Rotating the limit disc (804) causes the inclined surface of the limit seat (805) to disengage from the contact with the limiting member (803), so that the limiting member (803) no longer limits the limiting rod (807). Then, the cutting disc (806) is removed. After taking out a new cutting disc (806), the limiting rod (807) is aligned with the jacks of the cutting disc (806) and the limiting member (803) and inserted. Rotating the limit disc (804) causes the overall position of the limit seat (805) to move downward inside the limit block (802) and simultaneously squeeze the limiting member (803), causing the limiting member (803) to contract, thereby locking the limiting rod (807) and completing the replacement of the cutting disc (806).

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