Mechanical arm for hub production

Abstract

The invention discloses a mechanical arm for hub production, which relates to the technical field of hub production and comprises a grinding machine tool, a manipulator arranged on the grinding machine tool, a motor arranged at the end part of the manipulator, a placing disc rotationally arranged on the grinding machine tool and a hub workpiece placed on the placing disc, the fixing plates are distributed on the outer wall of the motor at equal angles, the main driving shaft rod is rotationally arranged at the end of the motor, and the first-stage clutch assembly is fixed to the bottoms of the fixing plates and descends synchronously with the main driving shaft rod. By means of the hub grinding device, the problem that when a mechanical arm executes grinding operation, due to grinding force application every time, a hub is prone to slight floating due to uneven stress, and the phenomenon directly leads to reduction of grinding precision is solved. In addition, when the round hole in the hub needs to be ground, the round hole still needs to be accurately aligned with a grinding head manually in advance in the prior art. If the correction is not accurate, the problem of eccentric wear is very easy to occur, and the production quality of the hub is further influenced.

Description

Technical Field

[0001] The present invention relates to the technical field of wheel hub production, and in particular to a robot arm for wheel hub production. Background Art

[0002] The wheel hub production robotic arm is an industrial robot specially used in the automobile wheel hub manufacturing process. Its core function is to replace manual labor with automated operations to complete various repetitive, high-precision or high-labor-intensity operations in the wheel hub production process, thereby improving production efficiency, ensuring product quality stability, and reducing labor costs and safety risks.

[0003] For example, a grinding and polishing equipment and method for aluminum alloy complex structure wheel hubs with publication number CN115383589A can realize the precision grinding and polishing of aluminum alloy wheel hubs by combining chemical mechanical polishing and CNC machining technology; an integrated scanner can realize real-time monitoring of the workpiece grinding and polishing process; integrated liquid supply can avoid problems such as grinding heat damage to the workpiece and overheating of the processing point, and ultimately realize high-quality and efficient grinding and polishing functions of aluminum alloy complex structure wheel hubs. However, the existing robotic arms used in wheel hub production still have some shortcomings.

[0004] Existing wheel hub production processes primarily utilize robotic arms for wheel hub grinding. However, these arms have limitations when performing wheel hub grinding. Each grinding operation can cause the wheel hub to slightly float due to uneven force applied by the robotic arm, directly impacting grinding accuracy. Furthermore, when grinding the circular hole in the wheel hub, the existing process still requires manual pre-alignment of the hole with the grinding head. Inaccurate alignment can easily lead to deviations in the grinding process, compromising wheel hub production quality.

[0005] In response to the above problems, it is urgent to carry out innovative design based on the original wheel hub production robot arm. Summary of the Invention

[0006] The technical solution of the present invention addresses the technical problem that the existing technical solutions are too simple, and provides a solution that is significantly different from the existing technologies. Specifically, the purpose of the present invention is to provide a robot arm for wheel hub production to solve the problem proposed in the above background technology that when the robot arm performs a grinding operation, the wheel hub is prone to slight floating due to uneven force applied each time the grinding is performed. This phenomenon directly leads to a decrease in grinding accuracy. In addition, when it is necessary to grind the circular hole on the wheel hub, the existing process still requires manual pre-alignment of the circular hole with the grinding head. If the calibration is inaccurate, grinding deviation is very likely to occur, which in turn affects the production quality of the wheel hub.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a wheel hub production robot arm, comprising a grinding machine, a robot arm mounted on the grinding machine, a motor mounted at the end of the robot arm, a placement disc rotatably mounted on the grinding machine, and a wheel hub workpiece placed on the placement disc, further comprising fixed plates rotatably mounted on the outer wall of the motor, a main drive shaft rotatably mounted at the end of the motor, a primary clutch assembly fixed to the bottom of the fixed plate and synchronously descending with the main drive shaft, a grinding assembly mounted on the primary clutch assembly and capable of stopping rotation upon force, and a secondary clutch assembly sleeved on the main drive shaft for internally supporting and fixing the wheel hub workpiece and rotating synchronously;

[0008] The primary clutch assembly includes a driven shaft rotatably arranged at the bottom of the fixed plate, a first friction wheel fixedly connected to the bottom of the driven shaft, and a second friction wheel arranged in the grinding structure and disconnected from the first friction wheel based on force;

[0009] The secondary clutch assembly includes a shell fixedly connected to the bottom of the main drive shaft, a movable sleeve lifted based on the force of the primary clutch assembly, and a friction block slidably arranged in the shell to rotate the hub workpiece based on the force expansion friction.

[0010] Preferably, the first-stage clutch assembly also includes a large gear mounted on the main driving shaft, a small gear mounted on the driven shaft and meshing with the large gear, a bearing mounted on the driven shaft, and a pressure plate fixedly connected to the outer wall of the bearing, the pressure plate is fixedly connected to the fixed plate, a rotating seat is rotatably provided on the top of the second friction wheel, a first spring is provided on the top of the rotating seat, the top of the first spring is fixedly connected to the bottom of the pressure plate, the bottom of the pressure plate is fixedly connected to an extension plate, and a limiting plate is fixedly connected to an inner wall of one side of the extension plate.

[0011] Preferably, the grinding structure includes a grinding shaft rotatably arranged at the bottom of the second friction wheel and a grinding roller fixedly connected to the bottom of the grinding shaft, the limit plate sliding sleeve is arranged on the grinding shaft, the bottom of the grinding roller is rotatably provided with an auxiliary ball for reducing the contact friction of the grinding roller, and the fixed sleeve on the grinding shaft is provided with a lifting plate for driving the movable sleeve to lift and slide.

[0012] Preferably, the secondary clutch assembly also includes a fixed sleeve rod fixedly mounted on the main drive shaft and a driving sleeve rod fixedly connected to the bottom of the movable sleeve, a second spring is arranged between the fixed sleeve rod and the movable sleeve, the second spring is mounted on the main drive shaft, one end of the driving sleeve rod is slidably arranged in the shell, and its end is fixedly connected to a driving ring for lifting the friction block to expand.

[0013] Preferably, the friction blocks are arranged in an equiangular distribution in the shell, and the bottom of one end of the shell is an arc surface driven by the driving ring to slide, and the end of the friction block exposed outside the shell is a friction arc surface that fits the inner wall of the hub workpiece.

[0014] Preferably, connecting plates are fixedly connected to both sides of the friction block, and a third spring is provided between the connecting plates and the inner wall of the shell.

[0015] Preferably, a limit plate for limiting the lifting of the drive ring is fixedly connected to the shell.

[0016] Preferably, the top end surface of the lifting plate is rotatably provided with balls distributed at equal angles.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The grinding roller presses against the outer wall of the hub workpiece. As the manipulator continues to descend, the grinding roller is forced to drive the second friction wheel upward. The second friction wheel squeezes the first spring toward the bottom of the pressure plate fixed to the outer wall of the bearing through the rotating seat arranged on the top of the second friction wheel, so that the second friction wheel and the first friction wheel are gradually disconnected. At this time, the grinding assembly stops rotating, avoiding wear on the hub workpiece caused by continued rotation;

[0019] 2. A lifting plate is provided on the fixed sleeve of the grinding shaft, which rises and drives the movable sleeve to lift and slide. At this time, the second spring is compressed to store energy. The movable sleeve moves upward to drive the driving sleeve rod and the driving ring to move upward. The driving ring contacts the bottom of the friction block distributed at equal angles in the shell in an arc-shaped surface, and pushes the friction block to slide outward along the preset sliding track inside the shell. During the outward sliding process of the friction block, the connecting plate squeezes the third spring, causing the third spring to store negative pressure energy. When the friction block expands, the friction arc surface presses against the inner wall of the axial hole of the hub workpiece, realizing the secondary centering of the hub workpiece. The main drive shaft drives the hub workpiece to rotate on the placement disc through the friction block pressing against the axial hole of the hub workpiece, and assists the hub workpiece to gradually move the spoke circular hole to directly below the grinding assembly;

[0020] 3. When the hub rotates until the spoke holes align with the grinding assembly, the grinding roller is relieved of the pressure from the hub. The second friction wheel, under the elastic force of the first spring, moves downward again, causing the second friction wheel to re-engage with the first friction wheel and rotate, thereby driving the grinding roller to grind the spoke holes. At this point, the external force driving the movable sleeve upward disappears, and the second spring releases its stored elastic potential energy, pushing the movable sleeve downward. The downward movement of the movable sleeve drives the drive sleeve rod and drive ring downward, and the drive ring no longer applies lifting force to the friction block. The third spring also releases its stored energy, pushing the friction block back to its initial state through the connecting plate, releasing its pressure on the inner wall of the hub's axial hole and completing the reset process of the secondary clutch assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2 It is a schematic diagram of the grinding state of the overall structure of the present invention.

[0023] Figure 3 It is a schematic diagram of the robot arm and grinding structure of the present invention.

[0024] Figure 4 Schematic diagram of the grinding structure of the present invention.

[0025] Figure 5 This is a schematic diagram of the grinding structure of the present invention from another angle.

[0026] Figure 6 It is a schematic diagram of the inner section of the wheel hub and the inner support centering structure of the present invention.

[0027] Figure 7 This is a schematic diagram from another angle showing the inner cross-section of the wheel hub and the inner support centering structure of the present invention.

[0028] Figure 8 This is a schematic diagram of the inner support centering structure of the present invention in the expanded state.

[0029] Figure 9 for Figure 8 A magnified schematic diagram of the structure at point A.

[0030] In the figure: 1. Grinding machine; 2. Manipulator; 3. Hub workpiece; 4. Fixed plate; 5. Main drive shaft; 6. Large gear; 7. Small gear; 8. First friction wheel; 9. Second friction wheel; 10. Rotating seat; 11. First spring; 12. Auxiliary ball; 13. Grinding roller; 14. Bearing; 1401. Pressure plate; 1402. Limiting plate; 15. Fixed sleeve; 16. Second spring; 17. Movable sleeve; 1701. Drive sleeve; 1702. Drive ring; 18. Housing; 1801. Limiting plate; 19. Friction block; 20. Lifting plate; 21. Connecting plate; 22. Third spring. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] See also Figures 1 to 9The present invention provides a technical solution: a robot arm for wheel hub production, comprising a grinding machine 1, a robot 2 arranged on the grinding machine 1, a motor arranged at the end of the robot 2, a placement disk rotatably arranged on the grinding machine 1, and a wheel hub workpiece 3 placed on the placement disk, further comprising fixed plates 4 arranged at equal angles on the outer wall of the motor, a main drive shaft 5 rotatably arranged at the end of the motor, a primary clutch assembly fixed to the bottom of the fixed plate 4 and synchronously descending with the main drive shaft 5, a grinding assembly arranged on the primary clutch assembly and stopped by force, and a secondary clutch assembly sleeved on the main drive shaft 5 for internally supporting and fixing the wheel hub workpiece 3 and rotating synchronously;

[0033] The primary clutch assembly includes a driven shaft rotatably arranged at the bottom of the fixed plate 4, a first friction wheel 8 fixedly connected to the bottom of the driven shaft, and a second friction wheel 9 arranged in the grinding structure and disconnected from the first friction wheel 8 based on force;

[0034] The secondary clutch assembly includes a housing 18 fixedly connected to the bottom of the main drive shaft 5, a movable sleeve 17 that is lifted by the force of the primary clutch assembly, and a friction block 19 that is slidably arranged in the housing 18 and drives the hub workpiece 3 to rotate due to force expansion friction.

[0035] As this embodiment, the hub workpiece 3 is placed on a placing disc (the placing disc is rotatable), and then the manipulator 2 is placed directly above the hub workpiece 3. Then the manipulator 2 descends and inserts the main drive shaft 5 straight into the axial hole of the hub workpiece 3 and performs a centering operation. When the spoke circular hole of the hub workpiece 3 is facing the grinding assembly, the grinding assembly and the main drive shaft 5 are synchronously inserted into the spoke circular hole. Then the motor is started, and the motor drives the main drive shaft 5 to rotate, and synchronously drives the first friction wheel 8 to rotate. The first friction wheel 8 frictionally drives the second friction wheel 9 to rotate, so that the second friction wheel 9 drives the grinding assembly to grind the spoke circular hole. When the spoke circular hole of the hub workpiece 3 is not facing the grinding assembly, the grinding assembly presses against the outer wall of the hub workpiece 3 and then moves upward. The second friction wheel 9 is clutched and disconnected from the first friction wheel 8, which stops the rotation of the grinding assembly. When the second friction wheel 9 is clutched and disconnected, the first-stage clutch assembly drives the movable sleeve 17 on the main drive shaft 5 to lift, so that the movable sleeve 17 drives the expansion of the friction block 19, thereby expanding the friction block 19 to press against the inner wall of the axial hole of the hub workpiece 3 and performing secondary centering of the hub. Subsequently, the main drive shaft 5 starts to drive the hub workpiece 3 to rotate on the placement disc through the friction block 19 that presses against the axial hole of the hub workpiece 3, until the spoke circular hole of the hub workpiece 3 is just aligned with the grinding assembly. The grinding assembly is elastically reset to put the second friction wheel 9 back into friction contact with the first friction wheel 8 and rotate, so that the grinding assembly grinds the spoke circular hole.

[0036] The first-stage clutch assembly also includes a large gear 6 mounted on the main drive shaft 5, a small gear 7 mounted on the driven shaft and meshing with the large gear 6, a bearing 14 mounted on the driven shaft, and a pressure plate 1401 fixedly connected to the outer wall of the bearing 14. The pressure plate 1401 is fixedly connected to the fixed plate 4. A rotating seat 10 is rotatably provided on the top of the second friction wheel 9. A first spring 11 is provided on the top of the rotating seat 10. The top of the first spring 11 is fixedly connected to the bottom of the pressure plate 1401. The bottom of the pressure plate 1401 is fixedly connected to an extension plate, and the inner wall of one side of the extension plate is fixedly connected to a limiting plate 1402.

[0037] In this embodiment, after the motor is started, the main drive shaft 5 begins to rotate. The large gear 6 on the main drive shaft 5 rotates accordingly, and through engagement with the small gear 7, it transmits power to the driven shaft. When the grinding assembly is required to work, the first friction wheel 8 and the second friction wheel 9 frictionally contact, transmitting power to the second friction wheel 9, and the second friction wheel 9 drives the grinding assembly to rotate. When the grinding assembly encounters an obstacle and needs to stop rotating, the grinding assembly begins to be forced to stop, while the driven shaft and the main drive shaft 5 continue to descend. At this time, the grinding assembly drives the second friction wheel 9 to move upward and squeezes the first spring 11 toward the bottom of the pressure plate 1401 through the rotating seat 10, then gradually disengages the second friction wheel 9 from the first friction wheel 8, and the grinding assembly stops rotating. (The extension plate and the limit plate 1402 at the bottom of the pressure plate 1401 limit the movement range of the grinding assembly to prevent the grinding assembly from exceeding the specified range during movement, thereby ensuring the accuracy and safety of the processing. At the same time, the use of the bearing 14 reduces the friction of the driven shaft and further limits the synchronous rotation of the pressure plate 1401 and the driven shaft, thereby improving the efficiency and stability of power transmission).

[0038] The grinding structure includes a grinding shaft rotatably arranged at the bottom of the second friction wheel 9 and a grinding roller 13 fixedly connected to the bottom of the grinding shaft. The limit plate 1402 is slidingly sleeved on the grinding shaft. The bottom of the grinding roller 13 is rotatably provided with an auxiliary ball 12 for reducing the contact friction force of the grinding roller 13. The fixed sleeve on the grinding shaft is provided with a lifting plate 20 for driving the movable sleeve 17 to lift and slide.

[0039] In this embodiment, when the spoke holes of the hub workpiece 3 are facing the grinding assembly, the grinding assembly and the main drive shaft 5 are synchronously inserted into the spoke holes. At this time, the motor starts, the main drive shaft 5 begins to rotate, and the large gear 6 rotates accordingly. Through engagement with the small gear 7, the driven shaft is transmitted to the power, and the driven shaft drives the first friction wheel 8 to rotate. The first friction wheel 8 is in frictional contact with the second friction wheel 9, transmitting power to the second friction wheel 9, which drives the grinding shaft to rotate, thereby causing the grinding roller 13 to grind the spoke holes. When the spoke holes of the hub workpiece 3 are not facing the grinding assembly, the grinding roller 13 presses against the outer wall of the hub workpiece 3. As the manipulator 2 continues to descend or is acted upon by an external force, the grinding assembly begins to stop rotating due to the force, while the driven shaft and the main drive shaft 5 continue to descend. At this time, the grinding assembly drives the second friction wheel 9 to move upward. The second friction wheel 9 squeezes the first spring 11 toward the bottom of the pressure plate 1401 through the rotating seat 10, causing the second friction wheel 9 to gradually disengage from the first friction wheel 8, and the grinding assembly stops rotating. At the same time, the lifting plate 20 on the grinding shaft rises and drives the movable sleeve 17 to lift and slide. Then the movable sleeve 17 moves upward to drive the friction block 19 to expand, causing the friction block 19 to expand and press against the inner wall of the axial hole of the hub workpiece 3, thereby achieving secondary centering of the hub workpiece 3. Subsequently, the main drive shaft 5 drives the hub workpiece 3 to rotate on the placement disc by pressing against the friction block 19 of the axial hole of the hub workpiece 3. While the hub workpiece 3 rotates, the grinding roller 13 reduces the friction force of contact with the hub workpiece 3 through the auxiliary ball 12 at the bottom, allowing the hub workpiece 3 to rotate better.

[0040] The secondary clutch assembly also includes a fixed sleeve rod 15 fixedly mounted on the main drive shaft 5 and a driving sleeve rod 1701 fixedly connected to the bottom of the movable sleeve 17. A second spring 16 is arranged between the fixed sleeve rod 15 and the movable sleeve 17. The second spring 16 is mounted on the main drive shaft 5. One end of the driving sleeve rod 1701 is slidably arranged in the shell 18, and its end is fixedly connected to a driving ring 1702 for lifting the friction block 19 to expand.

[0041] In this embodiment, when the spoke holes of the hub workpiece 3 are aligned with the grinding assembly and the grinding assembly resumes operation, the primary clutch assembly resumes power transmission, the second friction wheel 9 re-enters frictional contact with the first friction wheel 8, and the grinding assembly grinds the spoke holes. At this time, the external force driving the movable sleeve 17 upward disappears, and the second spring 16 begins to release its stored elastic potential energy, pushing the movable sleeve 17 downward. The downward movement of the movable sleeve 17 drives the drive sleeve rod 1701 and the drive ring 1702 downward. The drive ring 1702 no longer applies a lifting force to the friction block 19, and the friction block 19 returns to its initial state, releasing its pressure on the inner wall of the axial center hole of the hub workpiece 3, completing the reset process of the secondary clutch assembly and preparing for the next centering and driving operation of the hub workpiece 3.

[0042] The friction blocks 19 are arranged in equal angles in the shell 18. The bottom of one end of the shell 18 is an arc surface driven by the drive ring 1702 to slide. The end of the friction block 19 exposed outside the shell 18 is a friction arc surface that fits the inner wall of the hub workpiece 3.

[0043] In this embodiment, when the drive ring 1702 moves upward driven by the drive sleeve 1701, the drive ring 1702 contacts the arcuate surface at the bottom of the friction block 19. Driven by the drive ring 1702, the friction block 19 can slide outward smoothly and steadily along the sliding track preset inside the shell 18. When the friction block 19 expands and presses against the inner wall of the axial hole of the hub workpiece 3 under the drive of the drive ring 1702, a large friction force is generated between the friction arc surface and the inner wall of the hub workpiece 3. This friction force is the key power transmission medium for the main drive shaft 5 to drive the hub workpiece 3 to rotate. It can ensure that the rotational power of the main drive shaft 5 is effectively transmitted to the hub workpiece 3, allowing the hub workpiece 3 to rotate stably and accurately.

[0044] Connecting plates 21 are fixedly connected to both sides of the friction block 19 , and a third spring 22 is provided between the connecting plate 21 and the inner wall of the housing 18 .

[0045] As for this embodiment, when the friction block 19 is driven by the drive ring 1702 to slide outward, the connecting plate 21 can effectively squeeze the third spring 22, so that the third spring 22 stores negative pressure energy. When the drive ring 1702 releases the squeeze on the friction block 19, the third spring 22 is used to release and reset it, so that the friction block 19 is retracted into the shell 18.

[0046] A limiting plate 1801 is fixedly connected to the housing 18 for limiting the lifting of the driving ring 1702.

[0047] As in this embodiment, the limit plate 1801 can be used to limit the distance of the top of the driving ring 1702 to prevent it from rising over the friction block 19 and thus becoming unable to reset.

[0048] The top end surface of the lifting plate 20 is rotatably provided with balls distributed at equal angles.

[0049] In this embodiment, the balls are used to reduce the friction force of the lifting plate 20 on the bottom outer wall of the movable sleeve 17 and assist the movable sleeve 17 to rotate synchronously with the main drive shaft 5.

[0050] Working Principle: When using this wheel hub production robot arm, the hub workpiece 3 is first placed on the rotatable placement disc, and then the robot arm 2 is controlled to move directly above the hub workpiece 3. Next, the robot arm 2 descends and inserts the main drive shaft 5 straight into the axial hole of the hub workpiece 3, completing the first centering of the hub workpiece 3. At this time, the robot arm will enter different operating modes depending on the position of the spoke holes in the hub workpiece 3.

[0051] When the spoke hole is facing the grinding assembly: the motor starts and drives the main drive shaft 5 to rotate. The large gear 6 on the main drive shaft 5 rotates accordingly. Since the large gear 6 is engaged with the small gear 7 mounted on the driven shaft, power is transmitted to the driven shaft, causing the driven shaft to start rotating. The driven shaft drives the first friction wheel 8 fixed to its bottom to rotate. The first friction wheel 8 is in friction contact with the second friction wheel 9 that is rotatably set in the grinding structure, and transmits power to the second friction wheel 9. A grinding shaft is rotatably set at the bottom of the second friction wheel 9, and the grinding shaft drives the grinding roller 13 fixed to its bottom to rotate. At the same time, the grinding assembly and the main drive shaft 5 are synchronously inserted into the spoke hole of the hub workpiece 3, and the grinding roller 13 begins to grind the spoke hole.

[0052] When the spoke holes are not facing the grinding assembly: the grinding roller 13 presses against the outer wall of the hub workpiece 3. As the manipulator 2 continues to descend, the grinding roller 13 is forced to drive the second friction wheel 9 upward. The second friction wheel 9 squeezes the first spring 11 toward the bottom of the pressure plate 1401 fixed to the outer wall of the bearing 14 through the rotating seat 10 arranged on its top, so that the second friction wheel 9 and the first friction wheel 8 are gradually disengaged and disconnected. At this time, the grinding assembly stops rotating. At the same time, a lifting plate 20 is provided on the fixed sleeve of the grinding shaft. The lifting plate 20 rises and drives the movable sleeve 17 to lift and slide. A second spring 16 is provided between the movable sleeve 17 and the fixed sleeve rod 15 of the main drive shaft 5. At this time, the second spring 16 is compressed to store energy. The movable sleeve 17 moves upward, driving the driving sleeve rod 1701 and the driving ring 1702 to move upward. The driving ring 1702 contacts the arc-shaped surface of the bottom of the friction block 19 distributed at equal angles in the shell 18, and pushes the friction block 19 to slide outward along the sliding track preset inside the shell 18. During the outward sliding of the friction block 19, the connecting plate 21 squeezes the third spring 22, causing the third spring 22 to store negative pressure energy. When the friction block 19 expands, the friction arc surface presses against the inner wall of the axial hole of the hub workpiece 3, achieving secondary centering of the hub workpiece 3. The main drive shaft 5 drives the hub workpiece 3 to rotate on the placement disc by pressing against the friction block 19 of the axial hole of the hub workpiece 3. During the rotation of the hub workpiece 3, the auxiliary ball 12 arranged at the bottom of the grinding roller 13 reduces the friction when the grinding roller 13 contacts the hub workpiece 3, so that the hub workpiece 3 can rotate better;

[0053] When the hub workpiece 3 rotates until the spoke holes are aligned with the grinding assembly, the grinding roller 13 is relieved of the pressure from the hub workpiece 3. The second friction wheel 9 moves downward again under the elastic force of the first spring 11, causing the second friction wheel 9 to re-engage with the first friction wheel 8 and rotate, thereby driving the grinding roller 13 to grind the spoke holes. At this time, the external force driving the movable sleeve 17 to move upward disappears, and the second spring 16 releases the stored elastic potential energy, pushing the movable sleeve 17 downward. The downward movement of the movable sleeve 17 drives the drive sleeve rod 1701 and the drive ring 1702 downward. The drive ring 1702 no longer applies a lifting force to the friction block 19. The third spring 22 also releases the stored energy, pushing the friction block 19 back to its initial state through the connecting plate 21, releasing the pressure on the inner wall of the axial hole of the hub workpiece 3 and completing the reset process of the secondary clutch assembly.

[0054] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A hub production robot arm, comprising a grinding machine (1), a robot (2) mounted on the grinding machine (1), a motor mounted at the end of the robot (2), a rotating placement disc mounted on the grinding machine (1), and a hub workpiece (3) placed on the placement disc, characterized in that: The motor further comprises a fixing plate (4) arranged at equal angles on the outer wall of the motor, a main drive shaft (5) rotatably arranged at the end of the motor, a primary clutch assembly fixed at the bottom of the fixing plate (4) and synchronously descending with the main drive shaft (5), a grinding assembly arranged on the primary clutch assembly and stopping rotation based on force, and a secondary clutch assembly sleeved on the main drive shaft (5) for internally supporting and fixing the hub workpiece (3) and rotating synchronously. The primary clutch assembly comprises a driven shaft rotatably arranged at the bottom of a fixed plate (4), a first friction wheel (8) fixedly connected to the bottom of the driven shaft, and a second friction wheel (9) arranged in the grinding structure and disconnected from the first friction wheel (8) based on force; The secondary clutch assembly comprises a housing (18) fixedly connected to the bottom of the main drive shaft (5), a movable sleeve (17) lifted by the force of the primary clutch assembly, and a friction block (19) slidably arranged in the housing (18) and driven by the force to expand the friction to rotate the hub workpiece (3).

2. A wheel hub production robot according to claim 1, characterized in that: The first-stage clutch assembly further comprises a large gear (6) sleeved on the main driving shaft (5), a small gear (7) sleeved on the driven shaft and meshing with the large gear (6), a bearing (14) sleeved on the driven shaft, and a pressure plate (1401) fixedly connected to the outer wall of the bearing (14), wherein the pressure plate (1401) is fixedly connected to the fixed plate (4), a rotating seat (10) is rotatably provided on the top of the second friction wheel (9), a first spring (11) is provided on the top of the rotating seat (10), the top of the first spring (11) is fixedly connected to the bottom of the pressure plate (1401), the bottom of the pressure plate (1401) is fixedly connected to an extension plate, and the inner wall of one side of the extension plate is fixedly connected to a limiting plate (1402).

3. The wheel hub production robot according to claim 2, characterized in that: The grinding structure includes a grinding shaft rotatably arranged at the bottom of the second friction wheel (9) and a grinding roller (13) fixedly connected to the bottom of the grinding shaft, the limit plate (1402) is slidably sleeved on the grinding shaft, the bottom of the grinding roller (13) is rotatably provided with an auxiliary ball (12) for reducing the contact friction force of the grinding roller (13), and a lifting plate (20) for driving the movable sleeve (17) to lift and slide is fixedly sleeved on the grinding shaft.

4. The wheel hub production robot according to claim 1, characterized in that: The secondary clutch assembly further comprises a fixed sleeve rod (15) fixedly sleeved on the main drive shaft (5) and a driving sleeve rod (1701) fixedly connected to the bottom of the movable sleeve (17); a second spring (16) is provided between the fixed sleeve rod (15) and the movable sleeve (17); the second spring (16) is sleeved on the main drive shaft (5); one end of the driving sleeve rod (1701) is slidably provided in the housing (18), and the end thereof is fixedly connected to a driving ring (1702) for lifting and expanding the friction block (19).

5. The wheel hub production robot according to claim 1, characterized in that: The friction blocks (19) are arranged in an equiangular distribution in the housing (18), and the bottom of one end of the friction block (19) is an arc surface driven to slide by the driving ring (1702), and the end of the friction block (19) exposed outside the housing (18) is a friction arc surface that fits the inner wall of the hub workpiece (3).

6. The wheel hub production robot according to claim 5, characterized in that: Connecting plates (21) are fixedly connected to both sides of the friction block (19), and a third spring (22) is provided between the connecting plate (21) and the inner wall of the housing (18).

7. The wheel hub production robot according to claim 1, characterized in that: A limiting plate (1801) for limiting the lifting of the driving ring (1702) is fixedly connected inside the housing (18).

8. The wheel hub production robot according to claim 3, characterized in that: The top end surface of the lifting plate (20) is rotatably provided with balls distributed at equal angles.

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