Precise positioning method for bucket wheel of gate-type bucket wheel machine

Abstract

The invention discloses a gate-type bucket wheel machine bucket wheel accurate positioning method which comprises the following steps: SS01, pre-arrangement: arranging a first linear driving mechanism on two vertical guide rails on a gate-type bucket wheel machine, and after the first linear driving mechanism is arranged, additionally installing a first positioning auxiliary device on the first linear driving mechanism, the first positioning auxiliary device is in real-time data connection with an electric control module on the gate-type bucket-wheel machine, the first positioning auxiliary device positions the radial position of the bucket-wheel mechanism in real time, SS02, later arrangement is carried out, a second linear driving mechanism is arranged in a flat rail on the gate-type bucket-wheel machine, and the second linear driving mechanism is arranged later. Through the arrangement of the first camera, the second camera, the first RFID scanner, the second RFID scanner and other structures, when the bucket wheel machine works, double-effect accurate positioning can be conducted on the position of the bucket wheel mechanism in the bucket wheel machine through an RFID positioning recognition algorithm and an image recognition processing conversion algorithm.

Description

Technical Field

[0001] The invention relates to the technical field of portal bucket wheel machines, in particular to a method for accurately positioning a bucket wheel of a portal bucket wheel machine. Background Art

[0002] The bucket wheel excavator needs to ensure its balance during use and movement, otherwise it may cause abnormal wear and breakage of the wire rope, resulting in the fall of the movable beam, and the asynchronous movement distance on both sides of the gantry will cause serious faults such as the mechanism gnawing the track when the bucket wheel excavator is moving. These faults greatly threaten the safe operation of the gantry bucket wheel excavator, and will also increase the difficulty and cost of operation and maintenance. Therefore, it is necessary to accurately locate its movement process through the Internet of Things positioning mechanism.

[0003] In the prior art, a patent document with publication number CN216736552U discloses a precise positioning device for a gantry bucket wheel excavator based on the Internet of Things technology, including a gantry, two symmetrically arranged support columns are fixed at the bottom end of the gantry, a mobile frame is fixed at the bottom end of the support columns, a positioning box is fixed inside the mobile frame, a positioning mechanism is arranged inside the positioning box, brackets are fixed to the side walls on both sides of the support columns, a driving wheel is installed at the bottom end of the bracket, and guide rails that cooperate with each other are installed below the driving wheel. The positioning device monitors and positions both sides of the gantry through the positioning mechanism, so as to judge the balance of the gantry during movement, avoid the serious fault of the mechanism gnawing the rail when the bucket wheel excavator is moving due to the asynchronous movement distance, and greatly improve the safety of the equipment during use. However, the existing positioning method of the bucket wheel excavator is not convenient for double-effect or double positioning of the bucket wheel mechanism in the bucket wheel excavator when in use, so the positioning accuracy is low. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a method for accurately positioning the bucket wheel of a gantry bucket wheel excavator, which solves the problems raised by the above-mentioned background technology.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a method for accurately positioning the bucket wheel of a gantry bucket wheel machine, comprising the following steps:

[0006] SS01, pre-layout, lay out the first linear drive mechanism on the two vertical guide rails on the portal bucket wheel machine, after the first linear drive mechanism is laid out, install the first positioning auxiliary device on the first linear drive mechanism, the first positioning auxiliary device is connected with the electric control module on the portal bucket wheel machine in real time data, and the first positioning auxiliary device locates the radial position of the bucket wheel mechanism in real time;

[0007] SS02, after the layout, the second linear drive mechanism is laid out in the flat track on the portal bucket wheel machine. After the second linear drive mechanism is laid out, a second positioning auxiliary device is installed on the second linear drive mechanism. The second positioning auxiliary device is connected with the electric control module in real time data, and the lateral position of the bucket wheel mechanism is positioned in real time;

[0008] SS03, positioning, when the gantry bucket wheel machine is working, the electronic control module receives the positioning data feedback from the first positioning auxiliary device and the second positioning auxiliary device in real time, and then performs precise dual-axis positioning of the bucket wheel mechanism in the gantry bucket wheel machine;

[0009] The gantry bucket wheel machine comprises a flat rail, two symmetrically arranged vertical rails and a crossbeam fixed between the two vertical rails, the inner wall of the flat rail is slidably connected to the two vertical rails, and the circumferential side surface of the flat rail is slidably connected to a bucket wheel mechanism driven by a second linear drive mechanism;

[0010] The first positioning auxiliary device comprises a positioning chain belt driven by a first linear drive mechanism, a first RFID tag is equidistantly installed inside the positioning chain belt, a first scale mark is arranged on the outer surface of the positioning chain belt, and a first RFID scanner matched with the first RFID tag and a first camera matched with the first scale mark are respectively installed on the surface of the crossbeam;

[0011] The second positioning auxiliary device includes two marking wheels which are symmetrically arranged and rotatably connected to the inner wall of the flat rail, the two marking wheels are linked by a first belt, one of the marking wheels is driven by a second linear drive mechanism, a positioning marking tape is wound between the relative surfaces of the two marking wheels, second RFID tags are equidistantly distributed inside the positioning marking tape, a second scale mark is fixedly arranged on the surface of the positioning marking tape, and a second RFID scanner cooperating with the second RFID tag and a second camera cooperating with the second scale mark are respectively installed on the surface of the flat rail.

[0012] Preferably, the first linear drive mechanism includes a motor a fixed to the top of a vertical rail, the inner walls of the two vertical rails are rotatably connected with a transmission screw a, the peripheral side surfaces of the two transmission screws a are transmission connected to the flat rail, the output shaft end of the motor a is fixedly connected to one of the transmission screws a, and the peripheral side surfaces of the two transmission screws a are transmission connected to the positioning chain belt.

[0013] Preferably, the second linear drive mechanism comprises a motor b fixed to the inner wall of the flat rail and a linkage member installed in the flat rail, a transmission screw b is rotatably connected between the inner surfaces of the flat rail, the output shaft end of the motor b is fixedly connected to the transmission screw b, the peripheral side surface of the transmission screw b is transmission-connected to the bucket wheel mechanism, and the peripheral side surface of the linkage member is transmission-connected to one of the marking wheels.

[0014] Preferably, the linkage part includes a sleeve rotatably connected to the flat rail, the peripheral side surface of the sleeve is transmission-connected to the transmission screw b through a second belt, a shaft groove with openings at both ends is fixedly opened inside the sleeve, the inner wall of the shaft groove is transmission-connected and slidably fitted with a moving shaft, a clamping spring is sleeved on the peripheral side surface of the moving shaft, a limiting ring is fixedly installed on the tail end of the moving shaft, a driving bevel gear is fixedly installed on the front end of the moving shaft, and a driven bevel gear meshing with the driving bevel gear is fixedly installed on the peripheral side surface of the marking wheel.

[0015] Preferably, the cross sections of the shaft groove and the movable shaft are both regular polygons.

[0016] Preferably, the electric control module includes an electric control box fixedly connected to the crossbeam, a mainboard is fixedly installed inside the electric control box, ports of the mainboard are respectively connected to a communication module, an image processing chip and a central control chip, ports of the communication module are respectively electrically connected to the first RFID scanner, the second RFID scanner, the first camera and the second camera through data cables, and an image recognition module is built into the image processing chip.

[0017] Preferably, each of the first RFID tags and each of the second RFID tags stores unique position coding information, and ports of the first camera and the second camera are both equipped with fill lights.

[0018] Preferably, it also includes a tensioning platform slidably connected to the inside of the beam, the inner wall of the beam is transmission-connected with an adjusting screw, the peripheral side of the adjusting screw is transmission-connected to the tensioning platform, and the top surface of the tensioning platform is rotationally connected with a tensioning wheel that cooperates with the positioning chain belt transmission.

[0019] Preferably, a bottom rail is further included, and the bottom ends of the two vertical rails are connected to the bottom rail through a self-propelled mechanism.

[0020] Preferably, in the SS01 step, when the first positioning auxiliary device locates the radial position of the bucket wheel mechanism in real time, the following steps are adopted:

[0021] SS001. Radial positioning. Before the first positioning auxiliary device performs real-time positioning of the radial position of the bucket wheel, the operator first controls the flat rail to be lifted to the highest position through the first linear drive mechanism. Subsequently, the operator adjusts the position of the tensioning table and the positioning chain belt so that the initial scale of the positioning chain belt corresponds to the position of the first camera. In this state, the first RFID scanner reads the first RFID tag information of the corresponding position and marks the initial position. When the flat rail moves up and down under the driving action of the first linear drive mechanism, the corresponding positions of the first camera and the first RFID scanner and the positioning chain belt change adaptively. The first camera feeds back the captured image to the image processing chip in real time. The image processing chip collects the center scale of the picture collected by the first camera based on the OCR text recognition algorithm. The information scanned by the first RFID scanner is fed back to the central control chip in real time. The central control chip locates the radial position of the bucket wheel mechanism in real time based on the scanning data of the first RFID scanner and the image recognition data of the image processing chip.

[0022] SS002. Lateral positioning. Before the second positioning auxiliary device performs real-time positioning of the lateral position of the bucket wheel mechanism, the operator first drives the second linear drive mechanism to move the bucket wheel mechanism to the leftmost or rightmost position of the flat track. Subsequently, the operator adjusts the position of the movable shaft to adjust the corresponding positions of the second camera and the positioning mark tape. After correction, when the bucket wheel mechanism undergoes translational movement under the driving action of the second linear drive, the image processing chip collects the center scale of the image collected by the second camera based on the OCR text recognition algorithm, and the information scanned by the second RFID scanner is fed back to the central control chip in real time. The central control chip locates the lateral position of the bucket wheel mechanism in real time based on the scanning data of the second RFID scanner and the image recognition data of the image processing chip.

[0023] The beneficial effects of the present invention are:

[0024] The present invention arranges structures such as a first camera, a second camera, a first RFID scanner, and a second RFID scanner, so that the bucket wheel machine can perform dual-effect precise positioning of the position of the bucket wheel mechanism in the bucket wheel machine through an RFID positioning and recognition algorithm and an image recognition and processing conversion algorithm when the bucket wheel machine is working. By achieving the above-mentioned technical effects, the positioning accuracy of the positioning method when the bucket wheel machine is working is effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0026] Figure 1 It is a structural schematic diagram of a gantry bucket wheel machine to which a gantry bucket wheel machine bucket wheel precise positioning method of the present invention is applicable;

[0027] Figure 2 The present invention Figure 1 A schematic diagram of the local enlarged structure at point A in the middle;

[0028] Figure 3 The present invention Figure 1 A schematic diagram of the local enlarged structure at B in the middle;

[0029] Figure 4 The present invention Figure 1 A schematic diagram of the local enlarged structure at C in the middle;

[0030] Figure 5 The present invention Figure 1 A schematic diagram of the front view structure of

[0031] Figure 6 It is a schematic diagram of the structure of the tightening spring;

[0032] Figure 7 It is a principle block diagram of the mainboard, image processing chip and communication module of the present invention when they are connected.

[0033] Among them: 1. gantry bucket wheel excavator; 2. flat rail; 3. vertical rail; 4. crossbeam; 5. positioning chain belt; 6. first RFID tag; 7. first scale mark; 8. first RFID scanner; 9. first camera; 10. mark wheel; 11. positioning mark belt; 12. second RFID tag; 13. second scale mark; 14. second RFID scanner; 15. second camera; 16. transmission screw a; 17. transmission screw b; 18. bushing; 19. moving shaft; 20. tightening spring; 21. limiting ring; 22. main board; 23. communication module; 24. image processing chip; 25. central control chip; 26. tensioning table; 27. adjusting screw; 28. tensioning wheel; 29. ​​self-propelled mechanism; 30. bottom rail; 31. bucket wheel mechanism. DETAILED DESCRIPTION

[0034] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] Figure 1-Figure 7 As shown, a method for accurately positioning a bucket wheel of a gantry bucket wheel excavator comprises the following steps:

[0037] SS01, pre-layout, lay out the first linear drive mechanism on the two vertical guide rails on the portal bucket wheel machine 1, after the first linear drive mechanism is laid out, install a first positioning auxiliary device on the first linear drive mechanism, the first positioning auxiliary device is connected with the electric control module on the portal bucket wheel machine 1 in real time data, and the first positioning auxiliary device locates the radial position of the bucket wheel mechanism 31 in real time;

[0038] SS02, after the layout, the second linear drive mechanism is arranged in the flat track 2 on the portal bucket wheel machine 1. After the second linear drive mechanism is arranged, a second positioning auxiliary device is installed on the second linear drive mechanism. The second positioning auxiliary device is connected with the electric control module in real time data, and the lateral position of the bucket wheel mechanism 31 is positioned in real time;

[0039] SS03, positioning, when the gantry bucket wheel machine 1 is working, the electric control module receives the positioning data feedback from the first positioning auxiliary device and the second positioning auxiliary device in real time, and then performs precise dual-axis positioning of the bucket wheel mechanism 31 in the gantry bucket wheel machine 1;

[0040] The gantry bucket wheel excavator 1 comprises a flat rail 2, two symmetrically arranged vertical rails 3 and a crossbeam 4 fixed between the two vertical rails 3, and the inner wall of the flat rail 2 is slidably connected to the two vertical rails 3;

[0041] The circumferential side surface of the flat rail 2 is slidably connected with a bucket wheel mechanism 31 driven by a second linear drive mechanism;

[0042] The first positioning auxiliary device includes a positioning chain belt 5 driven by a first linear drive mechanism, a first RFID tag 6 is equidistantly installed inside the positioning chain belt 5, a first scale mark 7 is arranged on the outer surface of the positioning chain belt 5, and a first RFID scanner 8 matched with the first RFID tag 6 and a first camera 9 matched with the first scale mark 7 are respectively installed on the surface of the crossbeam 4;

[0043] The second positioning auxiliary device includes two marking wheels 10 symmetrically arranged and rotatably connected to the inner wall of the flat rail 2, the two marking wheels 10 are linked by a first belt, and one marking wheel 10 is driven by a second linear drive mechanism;

[0044] The second linear drive mechanism includes a motor b fixed to the inner wall of the flat rail 2 and a linkage member installed in the flat rail 2. A transmission screw b17 is rotatably connected between the inner surfaces of the flat rail 2. The output shaft end of the motor b is fixedly connected to the transmission screw b17. The peripheral side surface of the transmission screw b17 is transmission-connected to the bucket wheel mechanism 31. The peripheral side surface of the linkage member is transmission-connected to a marking wheel 10.

[0045] The linkage member includes a shaft sleeve 18 rotatably connected to the flat rail 2, the peripheral side of the shaft sleeve 18 is transmission-connected to the transmission screw b17 through a second belt, a shaft groove with openings at both ends is fixedly opened inside the shaft sleeve 18, a moving shaft 19 is transmission-connected and slidably matched with the inner wall of the shaft groove, a tightening spring 20 is sleeved on the peripheral side of the moving shaft 19, a limiting ring 21 is fixedly installed on the tail end of the moving shaft 19, a driving bevel gear is fixedly installed on the front end of the moving shaft 19, and a driven bevel gear meshing with the driving bevel gear is fixedly installed on the peripheral side of a marking wheel 10.

[0046] The cross sections of the shaft groove and the movable shaft 19 are both regular polygons;

[0047] By setting the shaft groove and the regular polygonal cross section of the moving shaft 19, the shaft sleeve 18 can continuously transmit the moving shaft 19 during the process of the moving shaft 19 changing its position;

[0048] A positioning tape 11 is wound between the relative surfaces of the two marking wheels 10, and second RFID tags 12 are evenly distributed inside the positioning tape 11. A second scale mark 13 is fixedly set on the surface of the positioning tape 11, and a second RFID scanner 14 cooperating with the second RFID tag 12 and a second camera 15 cooperating with the second scale mark 13 are respectively installed on the surface of the flat rail 2.

[0049] The first linear drive mechanism includes a motor a fixed to the top of a vertical rail 3, the inner walls of the two vertical rails 3 are rotatably connected with transmission screws a16, the peripheral side surfaces of the two transmission screws a16 are transmission connected to the flat rail 2, the output shaft end of the motor a is fixedly connected to a transmission screw a16, and the peripheral side surfaces of the two transmission screws a16 are transmission connected to the positioning chain 5.

[0050] It also includes a bottom rail 30, and the bottom ends of the two vertical rails 3 are connected to the bottom rail 30 through a self-propelled mechanism 29;

[0051] The electronic control module includes an electronic control box fixedly connected to the crossbeam 4, a main board 22 is fixedly installed inside the electronic control box, ports of the main board 22 are respectively connected to a communication module 23, an image processing chip 24 and a central control chip 25, ports of the communication module 23 are respectively electrically connected to the first RFID scanner 8, the second RFID scanner 14, the first camera 9 and the second camera 15 through data cables, and an image recognition module is built into the image processing chip 24.

[0052] Each first RFID tag 6 and each second RFID tag 12 stores unique position coding information, and the ports of the first camera 9 and the second camera 15 are both equipped with fill lights.

[0053] It also includes a tensioning platform 26 slidably connected to the inside of the beam 4, the inner wall of the beam 4 is transmission-connected with an adjusting screw 27, the peripheral side of the adjusting screw 27 is transmission-connected to the tensioning platform 26, and the top surface of the tensioning platform 26 is rotationally connected with a tensioning wheel 28 that cooperates with the positioning chain belt 5.

[0054] In step SS01, when the first positioning auxiliary device locates the radial position of the bucket wheel mechanism 31 in real time, the following steps are adopted:

[0055] SS001. Radial positioning. Before the first positioning auxiliary device performs real-time positioning of the radial position of the bucket wheel, the operator first controls the flat rail 2 to be lifted to the highest position through the first linear drive mechanism. Subsequently, the operator adjusts the position of the tensioning table 26 and the positioning chain belt 5 so that the initial scale of the positioning chain belt 5 corresponds to the position of the first camera 9. In this state, the first RFID scanner 8 reads the information of the first RFID tag 6 at the corresponding position and marks the initial position. When the flat rail 2 is displaced up and down under the driving action of the first linear drive mechanism, the corresponding positions of the first camera 9 and the first RFID scanner 8 and the positioning chain belt 5 are adaptively changed. The first camera 9 feeds back the captured image to the image processing chip 24 in real time. The image processing chip 24 collects the center scale of the picture collected by the first camera 9 according to the OCR text recognition algorithm. The information scanned by the first RFID scanner 8 is fed back to the central control chip 25 in real time. The central control chip 25 locates the radial position of the bucket wheel mechanism 31 in real time according to the scanning data of the first RFID scanner 8 and the image recognition data of the image processing chip 24.

[0056] SS002. Lateral positioning. Before the second positioning auxiliary device performs real-time positioning of the lateral position of the bucket wheel mechanism 31, the operator first drives the second linear drive mechanism to move the bucket wheel mechanism 31 to the leftmost or rightmost position of the flat rail 2. Then, the operator adjusts the position of the movable shaft 19 to adjust the corresponding positions of the second camera 15 and the positioning mark tape 11. After correction, when the bucket wheel mechanism 31 moves translationally under the driving action of the second linear drive, the image processing chip 24 collects the center scale of the picture collected by the second camera 15 based on the OCR text recognition algorithm, and the information scanned by the second RFID scanner 14 is fed back to the central control chip 25 in real time. The central control chip 25 locates the lateral position of the bucket wheel mechanism 31 in real time based on the scanning data of the second RFID scanner 14 and the image recognition data of the image processing chip 24.

[0057] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A method for accurately positioning a bucket wheel of a gantry bucket wheel excavator, characterized in that: The following steps are involved: SS01, pre-arrangement, arranging a first linear drive mechanism on two vertical guide rails on the portal bucket wheel machine (1), after the first linear drive mechanism is arranged, installing a first positioning auxiliary device on the first linear drive mechanism, the first positioning auxiliary device is connected to the electric control module on the portal bucket wheel machine (1) in real time data, and the first positioning auxiliary device locates the radial position of the bucket wheel mechanism (31) in real time; SS02, after deployment, a second linear drive mechanism is deployed in the flat track (2) on the portal bucket wheel machine (1), after the second linear drive mechanism is deployed, a second positioning auxiliary device is installed on the second linear drive mechanism, the second positioning auxiliary device is connected with the electric control module in real time data, and the lateral position of the bucket wheel mechanism (31) is positioned in real time; SS03, positioning, when the gantry bucket wheel machine (1) is working, the electric control module receives positioning data feedback from the first positioning auxiliary device and the second positioning auxiliary device in real time, and then performs precise dual-axis positioning of the bucket wheel mechanism (31) in the gantry bucket wheel machine (1); The gantry bucket wheel machine (1) comprises a flat rail (2), two symmetrically arranged vertical rails (3) and a cross beam (4) fixed between the two vertical rails (3); the inner wall of the flat rail (2) is slidably connected to the two vertical rails (3); and the circumferential side surface of the flat rail (2) is slidably connected to a bucket wheel mechanism (31) driven by a second linear drive mechanism; The first positioning auxiliary device comprises a positioning chain (5) driven by a first linear drive mechanism, first RFID tags (6) are equidistantly installed inside the positioning chain (5), a first scale mark (7) is arranged on the outer surface of the positioning chain (5), and a first RFID scanner (8) matched with the first RFID tag (6) and a first camera (9) matched with the first scale mark (7) are respectively installed on the surface of the crossbeam (4); The second positioning auxiliary device comprises two marking wheels (10) symmetrically arranged and rotatably connected to the inner wall of the flat rail (2), the two marking wheels (10) are linked by a first belt, one of the marking wheels (10) is driven by a second linear drive mechanism, a positioning tape (11) is wound between the opposite surfaces of the two marking wheels (10), second RFID tags (12) are evenly distributed inside the positioning tape (11), a second scale mark (13) is fixedly arranged on the surface of the positioning tape (11), and a second RFID scanner (14) cooperating with the second RFID tag (12) and a second camera (15) cooperating with the second scale mark (13) are respectively installed on the surface of the flat rail (2).

2. The method for accurately positioning a bucket wheel of a gantry bucket wheel excavator according to claim 1 is characterized by: The first linear drive mechanism comprises a motor a fixed to the top of a vertical rail (3); the inner walls of the two vertical rails (3) are rotatably connected with transmission screws a (16); the peripheral side surfaces of the two transmission screws a (16) are transmission-connected to the flat rail (2); the output shaft end of the motor a is fixedly connected to one of the transmission screws a (16); and the peripheral side surfaces of the two transmission screws a (16) are transmission-connected to the positioning chain belt (5).

3. The method for accurately positioning a bucket wheel of a gantry bucket wheel excavator according to claim 2 is characterized by: The second linear drive mechanism comprises a motor b fixed to the inner wall of the flat rail (2) and a linkage member installed in the flat rail (2); a transmission screw b (17) is rotatably connected between the inner surfaces of the flat rail (2); the output shaft end of the motor b is fixedly connected to the transmission screw b (17); the peripheral side surface of the transmission screw b (17) is transmission-connected to the bucket wheel mechanism (31); and the peripheral side surface of the linkage member is transmission-connected to one of the marking wheels (10).

4. The method for accurately positioning a bucket wheel of a gantry bucket wheel excavator according to claim 3 is characterized by: The linkage member comprises a shaft sleeve (18) rotatably connected to the flat rail (2); the peripheral side surface of the shaft sleeve (18) is transmission-connected to the transmission screw rod b (17) through a second belt; a shaft groove with two ends opened is fixedly provided inside the shaft sleeve (18); the inner wall of the shaft groove is transmission-connected and slidably matched with a moving shaft (19); a tightening spring (20) is sleeved on the peripheral side surface of the moving shaft (19); a limiting ring (21) is fixedly installed at the tail end of the moving shaft (19); a driving bevel gear is fixedly installed at the front end of the moving shaft (19); and a driven bevel gear meshing with the driving bevel gear is fixedly installed on the peripheral side surface of the marking wheel (10).

5. The method for accurately positioning a bucket wheel of a gantry bucket wheel excavator according to claim 4 is characterized by: The cross sections of the shaft groove and the movable shaft (19) are both regular polygons.

6. The method for accurately positioning a bucket wheel of a gantry bucket wheel excavator according to claim 1 is characterized by: The electric control module comprises an electric control box fixedly connected to the crossbeam (4), a mainboard (22) being fixedly installed inside the electric control box, ports of the mainboard (22) being respectively connected to a communication module (23), an image processing chip (24) and a central control chip (25), ports of the communication module (23) being respectively electrically connected to a first RFID scanner (8), a second RFID scanner (14), a first camera (9) and a second camera (15) via data cables, and an image recognition module being built into the image processing chip (24).

7. The method for accurately positioning a bucket wheel of a gantry bucket wheel excavator according to claim 6 is characterized by: Each of the first RFID tags (6) and each of the second RFID tags (12) stores unique position coding information, and the ports of the first camera (9) and the second camera (15) are both equipped with fill lights.

8. The method for accurately positioning a bucket wheel of a gantry bucket wheel excavator according to claim 2 is characterized by: It also includes a tensioning platform (26) slidably connected to the inside of the crossbeam (4), the inner wall of the crossbeam (4) is transmission-connected with an adjusting screw (27), the peripheral side surface of the adjusting screw (27) is transmission-connected to the tensioning platform (26), and the top surface of the tensioning platform (26) is rotationally connected to a tensioning wheel (28) that cooperates with the positioning chain belt (5).

9. The method for accurately positioning a bucket wheel of a gantry bucket wheel excavator according to claim 1, characterized in that: It also comprises a bottom rail (30), and the bottom ends of the two vertical rails (3) are connected to the bottom rail (30) via a self-propelled mechanism (29).

10. The method for accurately positioning a bucket wheel of a gantry bucket wheel excavator according to claim 7, characterized in that: In the SS01 step, when the first positioning auxiliary device locates the radial position of the bucket wheel mechanism (31) in real time, the following steps are adopted: SS001, radial positioning, before the first positioning auxiliary device performs real-time positioning of the radial position of the bucket wheel, the operator first controls the flat rail (2) to be raised to the highest position through the first linear drive mechanism. Subsequently, the operator adjusts the position of the tensioning table (26) and the positioning chain belt (5) so that the initial scale of the positioning chain belt (5) corresponds to the position of the first camera (9). In this state, the first RFID scanner (8) reads the information of the first RFID tag (6) at the corresponding position and performs initial position marking. When the flat rail (2) moves up and down under the driving action of the first linear drive mechanism, the first camera (9) and the first RFID scanner (8) read the information of the first RFID tag (6) at the corresponding position and performs initial position marking. The corresponding positions of an RFID scanner (8) and a positioning chain (5) are adaptively changed, and the first camera (9) feeds back the captured image to the image processing chip (24) in real time. The image processing chip (24) collects the center scale of the image captured by the first camera (9) according to the OCR text recognition algorithm. The information scanned by the first RFID scanner (8) is fed back to the central control chip (25) in real time. The central control chip (25) locates the radial position of the bucket wheel mechanism (31) in real time according to the scanning data of the first RFID scanner (8) and the image recognition data of the image processing chip (24); SS002, lateral positioning. Before the second positioning auxiliary device performs real-time positioning of the lateral position of the bucket wheel mechanism (31), the operator first drives the second linear drive mechanism to move the bucket wheel mechanism (31) to the leftmost or rightmost position of the flat track (2). Subsequently, the operator adjusts the position of the movable shaft (19) to adjust the corresponding position of the second camera (15) and the positioning mark tape (11). After calibration, when the bucket wheel mechanism (31) performs translational motion under the driving action of the second linear drive, the image processing chip (24) collects the center scale of the image collected by the second camera (15) according to the OCR text recognition algorithm, and the information scanned by the second RFID scanner (14) is fed back to the central control chip (25) in real time. The central control chip (25) locates the lateral position of the bucket wheel mechanism (31) in real time according to the scan data of the second RFID scanner (14) and the image recognition data of the image processing chip (24).

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