Precise control device and method for milling depth of key groove of automobile hub axle tube

Abstract

The invention discloses an automobile hub axle tube key groove milling depth accurate control device and method, relates to the technical field of key groove milling devices, and solves the technical problem of depth control. The automobile hub axle tube key groove milling depth accurate control device comprises a milling table, a mounting frame is slidably mounted at the top of the milling table, and a collecting box is arranged at the end, close to the mounting frame, of the milling table; a display assembly is arranged on the mounting frame; the display assembly comprises a scale plate slidably mounted in the mounting frame, a limiting block is fixedly mounted at the end, away from the milling table, of the scale plate, a contact plate is fixedly mounted at the end, away from the limiting block, of the scale plate, and a fixing plate with an electric telescopic block is fixedly mounted on the side, close to the contact plate, of the mounting frame. The depth of the key groove can be visually observed conveniently, the depth of the key groove can be accurately controlled conveniently, the control capacity of the depth of the key groove of the device can be improved easily, the working efficiency of key groove milling of the device can be improved easily, and the qualified rate of machining and production of the device can be improved easily.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of keyway milling devices, and particularly relates to an automobile hub shaft pipe keyway milling depth precision control device and method. BACKGROUND

[0002] The automobile hub is a cylindrical metal part for supporting a tire in a hub, and the automobile hub is provided with a shaft pipe. The shaft pipe needs to be processed with a keyway in the production process. A milling device needs to be used in the processing process. The depth of the milling device in the keyway processing process is generally observed by the naked eye of a worker.

[0003] However, in the prior art, the milling device in the keyway processing process of the automobile hub shaft pipe is generally observed by the naked eye of a worker, and the keyway depth error is large, the keyway milling depth cannot be accurately and objectively reflected, the keyway depth cannot be accurately controlled, the control ability of the device keyway depth is affected, the working efficiency of the device keyway milling is affected, and the processing qualification rate of the device is affected. Therefore, according to the technical defects, an automobile hub shaft pipe keyway milling depth precision control device and method are provided to solve the above problems. SUMMARY

[0004] The application aims to provide an automobile hub shaft pipe keyway milling depth precision control device and method, and solve the following technical problems:

[0005] The keyway depth error is large, the keyway milling depth cannot be accurately and objectively reflected, the keyway depth cannot be accurately controlled, the control ability of the device keyway depth is affected, the working efficiency of the device keyway milling is affected, and the processing qualification rate of the device is affected.

[0006] The application can be realized by the following technical scheme:

[0007] An automobile hub shaft pipe keyway milling depth precision control device comprises a milling table, a mounting frame is slidably arranged on the top of the milling table, a collecting box is arranged at one end of the milling table close to the mounting frame, and a display assembly is arranged on the mounting frame.

[0008] The display assembly includes a scale plate slidingly installed in the mounting frame, a limit block is fixedly installed at one end of the scale plate away from the milling table, a contact plate is fixedly installed at one end of the scale plate away from the limit block, a fixed plate with an electric telescopic block is fixedly installed on one side of the mounting frame close to the contact plate, a double-head motor is rotatably installed at one end of the fixed plate close to the milling table, a milling drill bit and a punching drill bit are respectively fixedly installed at two ends of the double-head motor, a first motor is fixedly installed on one side of the fixed plate away from the scale plate, a monitoring camera is fixedly installed on one side of the mounting frame close to the counterweight, and a display screen is fixedly installed on one side of the mounting frame.

[0009] As a further scheme of the present application, the number of the electric telescopic blocks is two, and the two electric telescopic blocks are respectively installed on the two sides of the electric telescopic block, the output end of the first motor slidingly penetrates the fixed plate and is fixedly installed on the double-head motor, and the limit block is fixedly installed on one side of the mounting frame away from the counterweight.

[0010] As a further scheme of the present application, the contact plate is fixedly installed on one side of the scale plate away from the scale plate, an inclined plate is fixedly installed between the scale plate and the contact plate, and the display screen and the monitoring camera are electrically connected.

[0011] As a further scheme of the present application, a sliding groove is formed at a position close to the mounting frame on the top of the milling table, a first electric telescopic rod is fixedly installed on the inner wall of one side of the sliding groove away from the collecting box, one end of the first electric telescopic rod close to the collecting box is fixedly installed on the mounting frame, a rectangular through hole is formed in the inner wall of one side of the sliding groove away from the inclined plate, a limit plate is slidingly penetrated and installed in the rectangular through hole, and one end of the limit plate close to the first electric telescopic rod is fixedly installed on the mounting frame.

[0012] As a further scheme of the present application, a clamping assembly is arranged on the milling table, the clamping assembly includes an installation groove formed in the milling table, a conveying belt is rotatably installed in the installation groove, a filter plate is fixedly installed at one end of the installation groove close to the collecting box, second electric telescopic rods are fixedly installed on the inner walls of the two sides of the installation groove, and clamping plates are fixedly installed at the ends of the two second electric telescopic rods close to each other.

[0013] As a further scheme of the present application, a non-slip pad is fixedly installed on one side of the clamping plate away from the second electric telescopic rod, a guide plate is rotatably installed on one side of the clamping plate away from the mounting frame, an elastic rope is fixedly installed between the guide plate and the clamping plate, and a plurality of sliding rollers are rotatably installed on one side of the guide plate away from the elastic rope.

[0014] As a further scheme of the present application: the milling table is provided with a limiting assembly, the limiting assembly comprises a groove opened on one end of the milling table close to the collecting box, a protruding block is slidably and penetratively installed in the groove, a receiving groove is opened on one side of the milling table close to the collecting box, an operating plate is slidably installed in the receiving groove, a limiting column is fixedly installed on one side of the operating plate close to the groove, and an elastic plate is fixedly installed on the side of the operating plate away from the limiting column.

[0015] As a further scheme of the present application: a limiting hole is fixedly installed on the protruding block in a position corresponding to the limiting column, and the limiting column is inserted into the limiting hole.

[0016] As a further scheme of the present application: an arc-shaped through hole is opened on the elastic plate, a guide rod is slidably and penetratively installed in the arc-shaped through hole, one end of the guide rod close to the groove is slidably and penetratively installed on the operating plate, and the guide rod is fixedly installed on the inner wall of the receiving groove at both ends.

[0017] A method for precisely controlling the milling depth of a key groove of an automobile wheel hub shaft pipe, which is applied to a device for precisely controlling the milling depth of a key groove of an automobile wheel hub shaft pipe, and comprises the following steps.

[0018] First, the limiting assembly is operated to install the collecting box on the milling table, and then the wheel hub shaft pipe is placed on the conveying belt, so that the conveying belt drives the wheel hub shaft pipe to move towards the guide plate under the guidance of the guide plate and the sliding roller, and then the second electric telescopic rod is started to clamp the wheel hub shaft pipe, and then the first electric telescopic rod is started to drive the mounting frame to slide on the sliding groove, and simultaneously drive the limiting plate to slide on the rectangular through hole, and simultaneously drive the punching drill to move above the wheel hub shaft pipe, and then the double-head motor and the mounting frame are started to punch the wheel hub shaft pipe, and then the mounting frame is moved upwards to pull out the punching drill from the wheel hub shaft pipe, and then the electric telescopic block is retracted, and the first motor is started to drive the double-head motor to rotate, so as to rotate the milling drill to the wheel hub shaft pipe, and then the milling drill is started to mill the key groove of the wheel hub shaft pipe, and simultaneously, the wheel hub shaft pipe is driven by the contact plate to slide on the mounting frame, and the monitoring camera transmits the detected data to the display screen, so as to facilitate the staff to observe in time and precisely control the milling depth.

[0019] The present application has the following advantages:

[0020] (1) The monitoring camera in the display assembly matches the scale board, which is convenient for observing the depth of the keyway intuitively, controlling the depth of the keyway accurately, improving the control ability of the device keyway depth, improving the working efficiency of the device keyway milling, and improving the qualified rate of the device processing production;

[0021] (2) The second electric telescopic rod in the clamping assembly matches the clamping plate, which is convenient for clamping the hub shaft pipe, keeps the hub shaft pipe always in the middle position of the installation groove, calibrates the center, improves the accuracy of the device milling keyway, improves the clamping ability of the device, and improves the clamping stability of the device;

[0022] (3) The limiting column in the limiting assembly is inserted into the limiting hole, which is convenient for installing, dismounting and collecting the box, collecting the debris, taking down the collecting box from the milling table, pouring the collected debris in the collecting box, improving the working efficiency of the device installation and dismounting, and improving the debris collecting ability of the device. BRIEF DESCRIPTION OF DRAWINGS

[0023] The application will be further described below with reference to the drawings.

[0024] Figure 1 is the overall structure schematic diagram of the automobile hub shaft pipe keyway milling depth precision control device of the application;

[0025] Figure 2 is Figure 1 the enlarged overall structure schematic diagram of A in the device;

[0026] Figure 3 is Figure 1 the enlarged structure schematic diagram of B in the device;

[0027] Figure 4 is Figure 1 the enlarged structure schematic diagram of C in the device;

[0028] Figure 5 is the side view structure schematic diagram of the automobile hub shaft pipe keyway milling depth precision control device of the application;

[0029] Figure 6 is Figure 5 the enlarged structure schematic diagram of D in the device;

[0030] Figure 7 is the bottom view structure schematic diagram of the automobile hub shaft pipe keyway milling depth precision control device of the application;

[0031] Figure 8 is Figure 7 the enlarged structure schematic diagram of E in the device;

[0032] Figure 9 is Figure 7An enlarged structural schematic view at the middle F.

[0033] In the figure: 1, milling table; 2, collection box; 3, mounting frame; 4, display assembly; 41, monitoring camera; 42, counterweight; 43, limiting block; 44, scale plate; 45, contact plate; 46, protective pad; 47, inclined plate; 48, electric telescopic block; 49, fixed plate; 410, first motor; 411, milling drill bit; 412, chute; 413, first electric telescopic rod; 414, rectangular through hole; 415, limiting plate; 416, display screen; 417, perforating drill bit; 418, double-head motor; 5, clamping assembly; 51, conveyor belt; 52, second electric telescopic rod; 53, clamping plate; 54, non-slip pad; 55, elastic rope; 56, guide plate; 57, sliding roller; 58, filter plate; 59, mounting groove; 6, limiting assembly; 61, groove; 62, protrusion; 63, storage groove; 64, operation plate; 65, limiting column; 66, guide rod; 67, elastic plate; 68, arc-shaped through hole; 69, limiting hole. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0035] Please refer to Figure 1 - Figure 9 As shown in the figure, the present application is a kind of automobile wheel hub shaft pipe keyway milling depth precision control device, including milling table 1, the top of milling table 1 is slidably installed with mounting frame 3, mounting frame 3 is with contraction function, one end of milling table 1 close to mounting frame 3 is provided with collection box 2, collection box 2 is used for collecting milling debris, display assembly 4 is provided on mounting frame 3, display assembly 4 is convenient for precise control of keyway depth;

[0036] The display assembly 4 comprises a scale plate 44 slidingly installed in the mounting frame 3, the scale plate 44 is flush with the downward rotating end of the punching drill bit 417, when the punching drill bit 417 moves downward, the scale plate 44 slides on the mounting frame 3 due to the contact of the contact plate 45 against the hub shaft tube, under the monitoring of the monitoring camera 41, the depth of the keyway is clearly known, the end of the scale plate 44 away from the milling table 1 is fixedly installed with a limit block 43, the limit block 43 plays a role in limiting and stabilizing the scale plate 44, the end of the scale plate 44 away from the limit block 43 is fixedly installed with a contact plate 45, the contact plate 45 is closely attached to the hub shaft tube, which facilitates clear feedback of the keyway depth, the side of the mounting frame 3 close to the contact plate 45 is fixedly installed with a fixed plate 49 with an electric telescopic block 48, the end of the fixed plate 49 close to the milling table 1 is rotatably installed with a double-head motor 418, the electric telescopic block 48 is convenient to retract into the fixed plate 49, which plays a role in limiting and stabilizing the double-head motor 418, the two ends of the double-head motor 418 are respectively fixedly installed with a milling drill bit 411 and a punching drill bit 417, the side of the fixed plate 49 away from the scale plate 44 is fixedly installed with a first motor 410, the first motor 410 plays a role in driving the double-head motor 418 to rotate on the fixed plate 49, the side of the mounting frame 3 close to the counterweight 42 is fixedly installed with a monitoring camera 41, one side of the mounting frame 3 is fixedly installed with a display screen 416, the display screen 416 and the monitoring camera 41 are electrically connected, the display screen 416 is convenient to timely show the size change of the scale plate 44 under the monitoring of the monitoring camera 41, which is convenient for accurate control of the keyway depth.

[0037] The number of electric telescopic blocks 48 is two, and they are respectively installed on the two sides of the electric telescopic block 48, which plays a role in limiting and stabilizing the double-head motor 418, the output end of the first motor 410 slides through the fixed plate 49 and is fixedly installed on the double-head motor 418, the side of the limit block 43 away from the mounting frame 3 is fixedly installed with a counterweight 42, the gravity of the counterweight 42 plays a role in driving the scale plate 44 and the contact plate 45 to move downward and reset, the side of the contact plate 45 away from the scale plate 44 is fixedly installed with a protective pad 46, the protective pad 46 plays a role in protecting the hub shaft tube, the inclined plate 47 is fixedly installed between the scale plate 44 and the contact plate 45, which plays a role in increasing the firmness of the contact plate 45.

[0038] A groove 412 is provided on the top of the milling table 1 near the mounting bracket 3. A first electric telescopic rod 413 is fixedly installed on the inner wall of the groove 412 away from the collection box 2. The first electric telescopic rod 413 drives the mounting bracket 3 to slide within the groove 412, causing the mounting bracket 3 to move the drilling bit 417 to above the wheel hub tube. The end of the first electric telescopic rod 413 near the collection box 2 is fixedly installed on the mounting bracket 3. A rectangular through hole 414 is provided on the inner wall of the groove 412 away from the inclined plate 47. A limit plate 415 is slidably installed through the rectangular through hole 414. The limiting plate 415 is fixedly installed on the mounting frame 3 at one end near the first electric telescopic rod 413. The limiting plate 415 serves to limit and stabilize the mounting frame 3, which facilitates timely adjustment of the position of the drilling bit 417 and the rotation of the dual-head motor 418. This minimizes the need to stop the machine to replace the milling drill bit 411 and the drilling bit 417, thereby improving the working efficiency of keyway milling and allowing for intuitive observation of the keyway depth. This facilitates precise control of the keyway depth, enhances the control capability of the keyway depth, and improves the pass rate of the equipment's processing and production.

[0039] Please see Figure 1 and Figure 2 As shown, a clamping assembly 5 is provided on the milling table 1. The clamping assembly 5 includes an installation slot 59 opened in the milling table 1. A conveyor belt 51 is rotatably installed in the installation slot 59, which serves to transport the wheel hub tube. A filter plate 58 is fixedly installed at the end of the installation slot 59 near the collection box 2. The filter plate 58 facilitates the filtering of debris from the wheel hub tube, causing the debris to fall into the collection box 2. Second electric telescopic rods 52 are fixedly installed on the inner walls on both sides of the installation slot 59. A clamping plate 53 is fixedly installed at the end of the two second electric telescopic rods 52 that are close to each other. The second electric telescopic rods 52 drive the clamping plate 53 to clamp and stabilize the wheel hub tube. An anti-slip pad 54 is fixedly installed on the side of the clamping plate 53 away from the second electric telescopic rods 52. The anti-slip pad 54 not only increases the friction between the wheel hub tube and the clamping plate 53, but also... The clamping plate 53 also serves to protect the hub axle tube. A guide plate 56 is rotatably mounted on the side of the clamping plate 53 away from the mounting bracket 3. The guide plate 56 guides the hub axle tube. An elastic rope 55 is fixedly installed between the guide plate 56 and the clamping plate 53. The elastic rope 55 makes the guide plate 56 slide against the inner wall of the mounting groove 59. Multiple sliding rollers 57 are rotatably mounted on the side of the guide plate 56 away from the elastic rope 55. The sliding rollers 57 reduce the friction between the hub axle tube and the surface of the guide plate 56, making it easier to clamp the hub axle tube and keep it in the middle position of the mounting groove 59. This keeps the hub axle tube below the drilling bit 417, which facilitates the calibration of the center. This helps improve the accuracy of the device in milling the keyway, improves the clamping capacity of the device, and improves the clamping stability of the device.

[0040] Please refer to Figure 7 and Figure 9 As shown in the milling table 1 is provided with a limiting assembly 6, limiting assembly 6 includes milling table 1 near the collection box 2 one end of the recess 61, the recess 61 in the sliding through the installation of the protrusion 62, the protrusion 62 away from the recess 61 one end of the fixed installation in the collection box 2, milling table 1 near the collection box 2 of one side of the storage groove 63, the storage groove 63 in the sliding installation of the operating plate 64, operating plate 64 near the recess 61 of one side of the fixed installation of the limiting column 65, operating plate 64 away from the limiting column 65 of one side of the fixed installation of the elastic plate 67, elastic plate 67 played a role in driving the operating plate 64 elastic reset, the protrusion 62 on the corresponding position of the limiting column 65 fixed installation of the limiting hole 69, limiting column 65 inserted into the limiting hole 69, played a role in limiting the stability of the protrusion 62, the elastic plate 67 on the opening of the arc-shaped hole 68, the arc-shaped hole 68 in the sliding through the installation of the guide rod 66, guide rod 66 near the recess 61 of one end of the sliding through the installation of the operating plate 64, both ends of the guide rod 66 fixed installation in the inner wall of the storage groove 63, the guide rod 66 played a role in guiding the stability of the operating plate 64, easy to install and disassemble the collection box 2, easy to take down the collection box 2 from the milling table 1, pour the collection box 2 in the collection of debris, help to improve the device installation and disassembly work efficiency.

[0041] A kind of automobile wheel hub axle pipe keyway milling depth precision control method is applied to a kind of automobile wheel hub axle pipe keyway milling depth precision control device, including the following steps:

[0042] First, the operation of the limiting component 6, the collection box 2 is installed on the milling table 1, and then the hub shaft tube is placed on the conveyor belt 51, and the conveyor belt 51 drives the hub shaft tube to move to the guide plate 56, and the hub shaft tube moves to the clamping plate 53 under the guidance of the guide plate 56 and the slide roller 57, and then the second electric telescopic rod 52 is started to clamp the hub shaft tube, and then the first electric telescopic rod 413 is started to drive the mounting bracket 3 to slide on the sliding groove 412, and at the same time the mounting bracket 3 drives the limiting plate 415 to slide on the rectangular through hole 414, and at the same time the mounting bracket 3 drives the punching drill bit 417 to move above the hub shaft tube, and then the double-head motor 418 and the mounting bracket 3 are started to punch the hub shaft tube, and then the mounting bracket 3 is moved upward to pull out the punching drill bit 417 from the hub shaft tube, and then the electric telescopic block 48 is started to retract, and the first motor 410 drives the double-head motor 418 to rotate, and the milling drill bit 411 is rotated to the hub shaft tube, and then the milling drill bit 411 is started to mill the keyway of the hub shaft tube, and at the same time the mounting bracket 3 drives the punching drill bit 417 to move downward, due to the reverse action of force, the hub shaft tube drives the scale plate 44 to slide on the mounting bracket 3 through the contact plate 45, and at the same time the monitoring camera 41 transmits the detected data to the display screen 416 for the staff to observe in time and control the milling depth accurately.

[0043] The working principle of the present application: when using the device, first pull the operating plate 64 upward, make the operating plate 64 slide on the guide rod 66 and extrude the elastic plate 67, so that the elastic plate 67 is in a compressed state, at the same time, make the operating plate 64 drive the limiting column 65 to retract into the storage slot 63, then insert the lug 62 into the recess 61, then release the operating plate 64, make the elastic plate 67 reset to drive the limiting column 65 to insert into the limiting hole 69, then place the wheel hub shaft tube on the conveyor belt 51, make the conveyor belt 51 drive the wheel hub shaft tube to move towards the guide plate 56, make the wheel hub shaft tube move towards the clamping plate 53 under the guidance of the guide plate 56 and the sliding roller 57, then start the second electric telescopic rod 52 to drive the clamping plate 53 to clamp the wheel hub shaft tube, make the elastic rope 55 drive the guide plate 56 to tightly fit with the inner wall of the mounting groove 59, then start the first electric telescopic rod 413 to drive the mounting frame 3 to slide on the sliding groove 412, at the same time, make the mounting frame 3 drive the limiting plate 415 to slide on the rectangular through hole 414, at the same time, make the mounting frame 3 drive the drilling bit 417 to move above the wheel hub shaft tube, then retract the electric telescopic block 48 into the fixed plate 49, then start the first motor 410 to drive the double-head motor 418 to rotate, make the double-head motor 418 move the drilling bit 417 to the position close to the wheel hub shaft tube, then extend the electric telescopic block 48 out of the fixed plate 49 to limit the double-head motor 418, then start the double-head motor 418 to drive the drilling bit 417 to rotate, then start the mounting frame 3 to retract, make the mounting frame 3 drive the contact plate 45 and the drilling bit 417 to move towards the wheel hub shaft tube, and continuously drill downwards, due to the reverse action of force, make the contact plate 45 drive the scale plate 44 to slide on the mounting frame 3, make the scale plate 44 slide on the size cup, and the monitoring camera 41 records the transmission belt display screen 416, when the size of the scale plate 44 sliding upwards reaches the required size, make the display screen 416 control the mounting frame 3 to pause downward movement, then make the mounting frame 3 reverse upwards, make the drilling bit 417 pull out of the drilled hole, then repeat the retraction of the electric telescopic block 48, then start the first motor 410 to drive the double-head motor 418 to rotate, make the double-head motor 418 drive the milling bit 411 to move to the position close to the wheel hub shaft tube, then limit the double-head motor 418 by the electric telescopic block 48 and start the double-head motor 418, make the mounting frame 3 drive the double-head motor 418 to move downwards and insert into the just drilled hole, when the scale plate 44 reappears the scale of drilling, pause the downward movement of the mounting frame 3, then start the first electric telescopic rod 413 to drive the mounting frame 3 to move in the sliding groove 412, make the mounting frame 3 drive the milling bit 411 to mill the length of the key groove on the wheel hub shaft tube through the fixed plate 49, after the machining is completed, retract the second electric telescopic rod 52 to make the machined wheel hub shaft tube fall on the conveyor belt 51,The belt 51 drives the hub axle tube to move to the filter plate 58 for filtering, so that the debris on the hub axle tube falls into the collecting box 2 for collection, and the hub axle tube passing through the filter plate 58 is subjected to additional collection operation.

[0044] The above has described one embodiment of the present application in detail, but the content is only the preferred embodiment of the present application, and cannot be considered to limit the implementation range of the present application. Any equivalent changes and improvements made according to the scope of the present application should still belong to the patent coverage range of the present application.

Claims

1. An automobile wheel hub axle tube keyway milling depth precision control device, comprising a milling table (1), characterized in that: The top of the milling table (1) is slidably installed with a mounting rack (3), one end of the milling table (1) close to the mounting rack (3) is provided with a collection box (2), and the mounting rack (3) is provided with a display assembly (4); The display assembly (4) comprises a scale plate (44) slidably installed in the mounting rack (3), one end of the scale plate (44) away from the milling table (1) is fixedly installed with a limiting block (43), one end of the scale plate (44) away from the limiting block (43) is fixedly installed with a contact plate (45), one side of the mounting rack (3) close to the contact plate (45) is fixedly installed with a fixed plate (49) with an electric telescopic block (48), one end of the fixed plate (49) close to the milling table (1) is rotatably installed with a double-head motor (418), both ends of the double-head motor (418) are fixedly installed with a milling drill bit (411) and a punching drill bit (417) respectively, one side of the fixed plate (49) away from the scale plate (44) is fixedly installed with a first motor (410), one side of the mounting rack (3) close to the counterweight block (42) is fixedly installed with a monitoring camera (41), and one side of the mounting rack (3) is fixedly installed with a display screen (416).

2. The device for precisely controlling the milling depth of the keyway of the axle tube of the automobile wheel hub according to claim 1, characterized in that: The number of the electric telescopic blocks (48) is two, and the electric telescopic blocks (48) are installed on the two sides of the electric telescopic blocks (48) respectively, the output end of the first motor (410) is slidably penetrated through the fixed plate (49) and fixedly installed on the double-head motor (418), and one side of the limiting block (43) away from the mounting rack (3) is fixedly installed with a counterweight block (42).

3. The device for precisely controlling the milling depth of the keyway of the axle tube of the automobile wheel hub according to claim 2, characterized in that: One side of the contact plate (45) away from the scale plate (44) is fixedly installed with a protective pad (46), the scale plate (44) and the contact plate (45) are fixedly installed with an inclined plate (47) therebetween, and the display screen (416) and the monitoring camera (41) are electrically connected.

4. The device for precisely controlling the milling depth of the keyway of the axle tube of the automobile wheel hub according to claim 3, characterized in that: A sliding groove (412) is formed in the position of the top of the milling table (1) close to the mounting rack (3), a first electric telescopic rod (413) is fixedly installed on the inner wall of the side of the sliding groove (412) away from the collection box (2), one end of the first electric telescopic rod (413) close to the collection box (2) is fixedly installed on the mounting rack (3), a rectangular through hole (414) is formed in the inner wall of the side of the sliding groove (412) away from the inclined plate (47), a limiting plate (415) is slidably penetrated through and installed in the rectangular through hole (414), and one end of the limiting plate (415) close to the first electric telescopic rod (413) is fixedly installed on the mounting rack (3).

5. The device for precisely controlling the milling depth of the keyway of the automobile wheel hub axle tube according to claim 4, characterized in that: The milling table (1) is provided with a clamping assembly (5), the clamping assembly (5) comprises an installation groove (59) formed in the milling table (1), a conveyor belt (51) is rotatably installed in the installation groove (59), a filter plate (58) is fixedly installed at one end of the installation groove (59) close to the collection box (2), second electric telescopic rods (52) are fixedly installed on the inner walls of the two sides of the installation groove (59), and the two second electric telescopic rods (52) are fixedly installed with clamping plates (53) at the ends close to each other.

6. The device for precisely controlling the milling depth of the keyway of an automobile wheel hub axle tube according to claim 5, characterized in that: The clamping plate (53) is fixedly installed with a non-slip pad (54) on the side away from the second electric telescopic rod (52), the clamping plate (53) is rotatably installed with a guide plate (56) on the side away from the mounting rack (3), the guide plate (56) and the clamping plate (53) are fixedly installed with an elastic rope (55) therebetween, and the guide plate (56) is rotatably installed with a plurality of sliding rollers (57) on the side away from the elastic rope (55).

7. The device for precisely controlling the depth of keyway milling of an automobile wheel hub axle tube according to claim 6, characterized in that: The milling table (1) is provided with a limiting assembly (6), the limiting assembly (6) comprises a groove (61) opened at one end of the milling table (1) close to the collecting box (2), the convex block (62) is slidably and penetratively installed in the groove (61), the receiving groove (63) is opened at one side of the milling table (1) close to the collecting box (2), the operating plate (64) is slidably installed in the receiving groove (63), the limiting column (65) is fixedly installed on one side of the operating plate (64) close to the groove (61), and the elastic plate (67) is fixedly installed on the other side of the operating plate (64) away from the limiting column (65).

8. The device for precisely controlling the depth of keyway milling of an automobile wheel hub axle tube according to claim 7, characterized in that: The limiting hole (69) is fixedly installed on the convex block (62) in a position corresponding to the limiting column (65), the limiting column (65) is inserted into the limiting hole (69), and one end of the convex block (62) away from the groove (61) is fixedly installed on the collecting box (2).

9. The device for precisely controlling the depth of keyway milling of an automobile wheel hub axle tube according to claim 8, characterized in that: The arc-shaped through hole (68) is opened in the elastic plate (67), the guide rod (66) is slidably and penetratively installed in the arc-shaped through hole (68), one end of the guide rod (66) close to the groove (61) is slidably and penetratively installed on the operating plate (64), and both ends of the guide rod (66) are fixedly installed on the inner wall of the receiving groove (63).

10. A method for precisely controlling the milling depth of a keyway of an automobile wheel hub axle tube, which is applied to the precisely controlling device for the milling depth of the keyway of the automobile wheel hub axle tube according to claim 9, characterized in that: Comprising the following steps; First operation limit component (6), the collection box (2) is installed on the milling table (1), then the wheel hub shaft pipe is placed on the conveyor belt (51), makes the conveyor belt (51) drive wheel hub shaft pipe movement to the guide plate (56), makes wheel hub shaft pipe movement to the clamping plate (53) under the guidance of guide plate (56) and slide roller (57), then start the second electric telescopic rod (52) and hold wheel hub shaft pipe, then start the first electric telescopic rod (413), make the first electric telescopic rod (413) drive mounting bracket (3) on the sliding slot (412) sliding, simultaneously make mounting bracket (3) drive limit board (415) on the rectangular through hole (414) sliding, simultaneously make mounting bracket (3) drive drilling head (417) movement to the upper of wheel hub shaft pipe, then start the double head motor (418) and mounting bracket (3) and carry out drilling to wheel hub shaft pipe, then through mounting bracket (3) and move upwards, pull out drilling head (417) from wheel hub shaft pipe, then start the electric telescopic block (48) and contract, then start the first motor (410) and drive double head motor (418) and carry out rotation, make milling drill bit (411) rotate to wheel hub shaft pipe, then start milling drill bit (411) and carry out keyway milling operation to wheel hub shaft pipe, simultaneously make mounting bracket (3) drive drilling head (417) and move downwards in the process, due to the reverse action of force, make wheel hub shaft pipe drive scale board (44) on mounting bracket (3) sliding through contact plate (45), simultaneously make monitoring camera (41) and transmit the data detected on display screen (416), facilitate staff to observe in time, facilitate to carry out accurate control to milling depth.

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