A constant velocity joint PCD dimension measuring apparatus

Abstract

This invention relates to the field of measuring equipment, specifically a constant velocity universal joint (PCD) dimensional measuring device. It includes a frame, on which a measuring tool and a robotic arm are mounted. A dome plate is fixedly mounted on the frame via a support frame, and the dome plate is coaxially arranged with the measuring tool. An alignment mechanism for aligning the outer star wheel's track position and a cleaning mechanism for removing particles adhering to the track are provided on the lower side of the dome plate. This invention employs a pushing component to drive abutment blocks radially against the curved surface of the outer star wheel's track, achieving automatic alignment of the outer star wheel. The aligned outer star wheel is then precisely placed onto the measuring tool to complete the PCD measurement, effectively improving automation and inspection efficiency. Furthermore, this invention utilizes a connecting component with a guide groove and a linkage column to force the cylindrical frame to reciprocate at small angles along a wave-like path, thereby automatically fine-tuning the position of the abutment blocks to more accurately align them to the center region of the track's curvature, improving alignment accuracy.

Description

Technical Field

[0001] This invention relates to the field of measuring equipment, specifically a constant velocity universal joint (PCD) dimension measuring device. Background Technology

[0002] The constant velocity joint is a core component of the automotive transmission system. Its outer wheel has several precision ball tracks evenly distributed in the inner circumference. The pitch circle diameter (PCD) of these ball tracks directly affects the transmission smoothness of the universal joint. Therefore, the PCD dimension of the ball tracks must be measured with high precision during the manufacturing process to ensure that it meets the design tolerance requirements.

[0003] Currently, automated measurement equipment typically uses a robotic arm to grab the outer wheel and transfer it to a dedicated measuring tool fixed on the frame, where the measuring tool automatically completes the detection of the PCD dimension of the ball track.

[0004] However, before measuring, it is necessary to ensure that the outer wheel ball track and the measuring tool probe are accurately aligned. However, currently, it generally relies on manual pre-positioning or simple placement by a robotic arm, lacking an active alignment mechanism. This not only reduces the level of automation, but also significantly slows down the detection efficiency due to repeated alignment adjustments.

[0005] In addition, processing debris or oil particles adhering to the surface of the ball lane can interfere with the measurement results. Existing technologies mostly use air blowing for cleaning, but the airflow is difficult to completely remove firmly adhered particles, and the blown-away impurities are easily splashed to other ball lanes or measurement areas, causing secondary pollution, resulting in incomplete cleaning and affecting the accuracy of the measurement. Summary of the Invention

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a constant velocity universal joint PCD dimension measuring device, including a frame, a measuring tool and a robot arm are arranged on the frame, a dome plate is fixedly installed on the frame by a support frame, the dome plate and the measuring tool are arranged coaxially, an alignment mechanism for aligning the position of the outer star wheel ball track is provided on the lower side of the dome plate, and a cleaning mechanism for removing particles adhering to the ball track.

[0007] The alignment mechanism includes a cylindrical frame set at the bottom of the dome plate via a connecting component. Several abutment blocks that slide radially are equally spaced along the circumference of the cylindrical frame. The number of abutment blocks is equal to the number of lanes on the outer planet wheel. The side of the abutment block away from the axis of the cylindrical frame matches the curved surface of the lane. A pushing component is provided on the cylindrical frame to push the abutment blocks against the lane.

[0008] The cleaning mechanism includes a sliding plate that slides up and down inside the abutment block. On the side of the sliding plate away from the axis of the cylindrical frame, there are several scrapers that slide radially along the cylindrical frame at equal intervals in the up and down direction.

[0009] The pushing component pushes the abutting block against the corresponding ball track. The robot arm drives the cylindrical frame to move upward through the outer wheel, so that the connecting component drives the ball track on the outer wheel to correspond with the position of the measuring tool by rotating the cylindrical frame, and scrapes away the impurity particles on the ball track by the scraper.

[0010] As a preferred embodiment of the present invention, the connecting assembly includes a fixed cylinder fixedly installed on the lower side of the dome plate, guide grooves are provided at equal intervals along the circumference on the outer surface of the fixed cylinder, and a claw frame sleeved on the upper side of the cylindrical frame is fixedly installed outside the fixed cylinder.

[0011] As a preferred embodiment of the present invention, the lower part of the guide groove has a wave-like structure and the upper part has a vertical structure. A linkage column that is slidably connected inside the guide groove is provided on the claw frame, and a spring damping rod is provided between the fixed cylinder and the cylindrical frame.

[0012] As a preferred embodiment of the present invention, the pushing assembly includes a hexagonal cylinder fixedly installed at the axis position of the cylindrical frame, a driven block slidably disposed on the inner side of the hexagonal cylinder, an extrusion plate slidably disposed on the side of the abutment block near the axis of the cylindrical frame along the radial direction of the cylindrical frame, and a connecting plate hinged between the lower end of the driven block and each extrusion plate.

[0013] As a preferred embodiment of the present invention, a plurality of helical springs are provided between the extrusion plate and the corresponding abutment block, a toothed plate is slidably provided on the upper side of the abutment block, a push spring is provided between the toothed plate and the abutment block, and a notch is provided on the side of the toothed plate near the axis of the cylindrical frame.

[0014] As a preferred technical solution of the present invention, the hexagonal cylinder is provided with snap-fit ​​plates that are slidably arranged at equal intervals along the circumference of the cylindrical frame for insertion into the notch groove. A protruding column is fixedly installed on the side of the snap-fit ​​plate near the axis of the cylindrical frame, and a wedge plate corresponding to the protruding column is fixedly installed on the upper side of the driven block.

[0015] As a preferred embodiment of the present invention, a one-way damping rod is slidably arranged on the upper side of the toothed plate along the radial direction of the cylindrical frame, and a rotating frame is slidably arranged on the inner side of the claw frame and rotatably connected to the lower end of the fixed cylinder. The cylinder body of the one-way damping rod is fixedly installed on the rotating frame.

[0016] As a preferred embodiment of the present invention, two symmetrically arranged trigger rods are slidably arranged on the abutment block along the radial direction of the cylindrical frame, and two symmetrically arranged filling rods are slidably arranged on the abutment block along its thickness direction. An inclined groove is provided on the trigger rod, and a fixing rod that mates with the corresponding inclined groove opening is fixedly installed on the upper side of the filling rod.

[0017] As a preferred embodiment of the present invention, a return spring is provided between the scraper and the corresponding sliding plate, and a pushing spring is provided between the sliding plate and the abutment block. Two symmetrical slots are provided on the sliding plate, and a card plate for extending into the slot is fixedly installed on the filling rod.

[0018] As a preferred embodiment of the present invention, a sludge storage groove is provided on the upper side of the scraper, and a cover plate is fixedly installed on the upper side of the scraper near the axis of the cylindrical frame, and an oil-absorbing sponge is fixedly connected to the lower side of the cover plate.

[0019] The beneficial effects of this invention are as follows: First, this invention uses a robotic arm to drive the outer star wheel to move upward first, so that the outer star wheel is covered on the outside of the cylindrical frame. By pushing the component to drive the abutment block to radially press against the outer star wheel's ball track surface, the outer star wheel is automatically aligned. Then, the robotic arm clamps the outer star wheel, moves it downward and rotates it half a turn, and accurately covers the aligned outer star wheel on the measuring instrument to complete the PCD measurement. Through the active alignment mechanism, the level of automation and detection efficiency are effectively improved.

[0020] Second, when the pusher component pushes the abutment block to fit the fairway, the outer star wheel moves upward and drives the cylindrical frame to rise synchronously. Through the guide groove of the connecting component and the linkage column, the cylindrical frame is forced to reciprocate at a small angle along the wave structure path, thereby automatically fine-tuning the position of the abutment block so that it can be more accurately aligned with the center area of ​​the fairway curvature, thus improving the alignment accuracy.

[0021] Third, the present invention adopts the method of moving the abutment block and simultaneously driving the trigger rod and the filling rod to move. When the abutment block contacts the ball lane, the reaction force of the ball lane pushes the trigger rod to slide in the opposite direction. Through the cooperation of the inclined groove and the fixed rod, the filling rod is driven to extend to both sides until the two filling rods on the same abutment block are supported on both sides of the ball lane, thereby doubly positioning the ball lane position and further ensuring that the abutment block is stably positioned at the center of the ball lane.

[0022] Fourth, this invention uses a stop block that drives a scraper to simultaneously abut against the curved surface of the ball track via a sliding plate. When the filling rod unfolds to support both sides of the ball track, the push spring releases its elasticity to push the sliding plate upward, causing the scraper to scrape off the adhering particles along the curved surface of the ball track. Physical scraping effectively removes stubborn impurities that cannot be removed by air blowing. Furthermore, the dirt storage groove of the scraper and the oil-absorbing sponge on the underside of the cover plate work together to absorb the scraped particles, avoiding impurities splashing or secondary pollution, and ensuring measurement accuracy. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0025] Figure 2 This is a partial structural diagram of the support frame, dome plate, cylindrical frame and abutment block in this invention.

[0026] Figure 3 This is a partial structural diagram of the support frame, cylindrical frame, unidirectional damping rod, and claw frame in this invention.

[0027] Figure 4 This is a schematic diagram of the structure of the fixed cylinder, cylindrical frame, abutment block and spring damping rod in this invention.

[0028] Figure 5 This is a partial sectional view of the fixed cylinder, rotating frame, spring damping rod, and filling rod in this invention.

[0029] Figure 6 This is a partial cross-sectional view of the abutment block, extrusion plate, hexagonal cylinder, and scraper in this invention.

[0030] Figure 7 This is a partial cross-sectional view of the abutment block, toothed plate, scraper, and filling rod in this invention.

[0031] Figure 8 This is a partial cross-sectional view of the sliding plate, the abutment block, the wedge plate, and the toothed plate in this invention.

[0032] Figure 9 This is a partial cross-sectional view of the extrusion plate, the toothed plate, the snap plate, and the protruding column in this invention.

[0033] In the diagram: 1. Frame; 2. Measuring tool; 3. Robotic arm; 4. Support frame; 5. Dome plate; 6. Alignment mechanism; 7. Cleaning mechanism; 61. Connecting assembly; 62. Cylindrical frame; 63. Abutting block; 64. Pushing assembly; 65. Trigger rod; 71. Sliding plate; 72. Scraper; 611. Fixed cylinder; 612. Claw frame; 613. Linkage column; 614. Spring damping rod; 631. Toothed plate; 632. Buckle plate; 633. Protruding column; 634. Wedge plate; 635. One-way damping rod; 636. Rotating frame; 641. Hexagonal cylinder; 642. Driven block; 643. Extrusion plate; 644. Connecting plate; 651. Filling rod; 652. Fixed rod; 711. Clamping plate; 721. Cover plate. Detailed Implementation

[0034] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in the art or in accordance with the product manual.

[0035] See Figure 1 and Figure 2A constant velocity universal joint PCD dimension measuring device includes a frame 1, a measuring tool 2 and a robot arm 3 mounted on the frame 1, a dome plate 5 fixedly mounted on the frame 1 via a support frame 4, the dome plate 5 and the measuring tool 2 being arranged coaxially, an alignment mechanism 6 for aligning the position of the outer star wheel track and a cleaning mechanism 7 for removing particles adhering to the track are provided on the lower side of the dome plate 5.

[0036] It should be noted that the robotic arm 3 is connected to the frame 1 via the existing slide rail moving assembly, and the robotic arm 3 adopts the synchronous relative moving gripper with flipping function in the existing technology.

[0037] When it is necessary to measure the PCD dimension of the ball track inside the outer wheel of the constant velocity universal joint, the robot arm 3 is first moved to the production line by the slide rail moving assembly to grasp the outer wheel. At this time, the ball track part of the outer wheel is arranged facing upward. Then, the slide rail moving assembly drives the robot arm 3 to move the outer wheel to the lower part of the alignment mechanism 6 and relaxes the robot arm 3, so that the robot arm 3 limits the outer wheel but does not clamp it.

[0038] Then, the slide rail moving assembly drives the robot arm 3 to move the outer wheel upward, so that the outer wheel gradually covers the outside of the alignment mechanism 6. The alignment mechanism 6 drives the outer wheel to rotate until the ball track on it corresponds one-to-one with the measuring point of the measuring tool 2. Then, the cleaning mechanism 7 automatically scrapes and cleans the ball track during physical contact, removing the particulate impurities adhering to the ball track. Then, the robot arm 3 clamps the outer wheel and moves it downward. When the outer wheel moves downward to the appropriate position, the robot arm 3 rotates half a turn and then continues to move downward, causing the outer wheel to cover the outside of the measuring tool 2. The measuring tool 2 measures the PCD dimension of the ball track on the outer wheel.

[0039] See Figure 1 , Figure 2 , Figure 3 and Figure 4 The alignment mechanism 6 includes a cylindrical frame 62 disposed at the lower part of the dome plate 5 via a connecting component 61. A plurality of abutment blocks 63 are disposed at equal intervals along the circumference of the cylindrical frame 62 and slide radially thereon. The number of abutment blocks 63 is equal to the number of lanes on the outer planet wheel. The side of the abutment block 63 away from the axis of the cylindrical frame 62 matches the curved surface of the lane. A pushing component 64 is disposed on the cylindrical frame 62 to push the abutment blocks 63 against the lane.

[0040] See Figure 2 , Figure 3 and Figure 4 The connecting component 61 includes a fixed cylinder 611 fixedly installed on the lower side of the dome plate 5. Guide grooves are evenly spaced along the circumference on the outer surface of the fixed cylinder 611. A claw frame 612 sleeved on the outside of the fixed cylinder 611 is fixedly installed on the upper side of the cylindrical frame 62.

[0041] See Figure 4 and Figure 5 The lower part of the guide groove has a wave-like structure and the upper part has a vertical structure. The claw frame 612 is equipped with a linkage column 613 that is slidably connected inside the guide groove. A spring damping rod 614 is provided between the fixed cylinder 611 and the cylindrical frame 62.

[0042] In the initial state, the spring damping rod 614 pushes the cylindrical frame 62 away from the fixed cylinder 611 by its own elastic force, so that the cylindrical frame 62 drives the linkage column 613 to move to the bottom of the guide groove through the claw frame 612.

[0043] See Figure 3 , Figure 5 and Figure 6 The pushing component 64 includes a hexagonal cylinder 641 fixedly installed at the axis position of the cylindrical frame 62. A driven block 642 is slidably arranged on the inner side of the hexagonal cylinder 641. An extrusion plate 643 is slidably arranged on the side of the abutment block 63 near the axis of the cylindrical frame 62 along the radial direction of the cylindrical frame 62. A connecting plate 644 is hinged between the lower end of the driven block 642 and each extrusion plate 643.

[0044] It should be noted that a first spring is provided between the upper end of the driven block 642 and the cylindrical frame 62. In the initial state, the first spring is in its natural state and pushes the driven block 642 downward, so that the driven block 642 pulls the extrusion plate 643 in the direction close to the axis of the cylindrical frame 62 through the connecting plate 644. The extrusion plate 643 drives the abutment block 63 to retract synchronously inside the cylindrical frame 62.

[0045] See Figure 5 , Figure 6 , Figure 7 and Figure 9 A number of helical springs are provided between the extrusion plate 643 and the corresponding abutment block 63. A toothed plate 631 is slidably provided on the upper side of the abutment block 63. A push spring is provided between the toothed plate 631 and the abutment block 63. A notch is provided on the side of the toothed plate 631 near the axis of the cylindrical frame 62.

[0046] See Figure 7 , Figure 8 and Figure 9 The hexagonal tube 641 is slidably provided with snap plates 632 at equal intervals along the circumference of the cylindrical frame 62 for inserting into the notch. A protruding post 633 is fixedly installed on the side of the snap plate 632 near the axis of the cylindrical frame 62. A wedge plate 634 corresponding to the protruding post 633 is fixedly installed on the upper side of the driven block 642.

[0047] See Figure 3 , Figure 5 and Figure 8A one-way damping rod 635 is slidably arranged on the upper side of the toothed plate 631 along the radial direction of the cylindrical frame 62. A rotating frame 636, which is rotatably connected to the lower end of the fixed cylinder 611, is slidably arranged on the inner side of the claw frame 612. The cylinder body of the one-way damping rod 635 is fixedly installed on the rotating frame 636.

[0048] It should be noted that the side of the buckle plate 632 away from the axis of the cylindrical frame 62 is provided with an inclined surface, so that when the buckle plate 631 contacts the buckle plate 632, the buckle plate 631 can automatically push the buckle plate 632 away from the buckle plate 632 through contact with the inclined surface of the buckle plate 632. A second spring is provided between the buckle plate 632 and the hexagonal cylinder 641. When the buckle plate 631 moves to the position of the notch on it corresponding to the buckle plate 632, the buckle plate 632 moves to the initial position under the push of the second spring force, so that the buckle plate 632 extends into the notch of the buckle plate 631, thereby locking the buckle plate 631 and the hexagonal cylinder 641 together.

[0049] In the initial state, the toothed plate 631 is locked together with the hexagonal cylinder 641, and the toothed plate 631 is synchronously positioned away from the fixed cylinder 611 along with the cylindrical frame 62. The telescopic section of the one-way damping rod 635 is in the maximum extended position, which causes the telescopic section of the one-way damping rod 635 to pull the toothed plate 631 upward, so that in the initial state, the toothed plate 631 does not contact the pressing plate 643.

[0050] It should be noted that the snap-fit ​​plate 632 slides in the inner wall of the hexagonal cylinder 641. The outer side of the hexagonal cylinder 641 is provided with rectangular slots that correspond one-to-one with the snap-fit ​​plate 631 and allow the snap-fit ​​plate 631 to be inserted. When the snap-fit ​​plate 631 is locked together with the hexagonal cylinder 641, the snap-fit ​​plate 631 is inserted into the rectangular slot of the hexagonal cylinder 641, so that the rectangular slot limits the upper and lower position of the snap-fit ​​plate 631, and further ensures that the snap-fit ​​plate 631 does not contact the pressing plate 643 in the initial state.

[0051] When the outer wheel moves upward under the drive of the robotic arm 3 and gradually covers the outside of the hexagonal cylinder 641, the outer wheel contacts the driven block 642 and gradually pushes the driven block 642 upward, so that the driven block 642 gradually squeezes the first spring. Since the cylindrical frame 62 pushes the compression spring damping rod 614 at a relatively slow speed, the upward speed of the driven block 642 is much greater than that of the cylindrical frame 62, so that the driven block 642 moves upward relative to the cylindrical frame 62.

[0052] As the cylindrical frame 62 moves slowly upward, it drives the hexagonal cylinder 641 and the abutment block 63 to move upward synchronously. The abutment block 63 drives the toothed plate 631 to move upward, while the hexagonal cylinder 641, which moves upward synchronously, continues to limit the vertical position of the toothed plate 631 through its rectangular groove, preventing the toothed plate 631 from contacting the extrusion plate 643. The toothed plate 631 pushes the one-way damping rod 635 to move upward relative to the rotating frame 636.

[0053] During the upward movement of the driven block 642 relative to the cylindrical frame 62, the driven block 642 pushes the extrusion plate 643 away from the axis of the cylindrical frame 62 through the connecting plate 644. At this time, since the abutment block 63 is locked to the hexagonal cylinder 641 through the toothed plate 631 and cannot move away from the hexagonal cylinder 641, the extrusion plate 643 moves away from the axis of the cylindrical frame 62 relative to the abutment block 63 and compresses the helical spring. At the same time, the driven block 642 drives the wedge plate 634 to move upward synchronously.

[0054] When the wedge-shaped surface of the wedge plate 634 moves up to contact the protruding post 633, the wedge plate 634 pushes the protruding post 633 to drive the snap plate 632 to gradually move away from the snap tooth plate 631. When the snap plate 632 completely exits the notch of the snap tooth plate 631, the snap tooth plate 631 and the hexagonal cylinder 641 are no longer locked together. At this time, the outer star wheel has pushed the driven block 642 upward to the interior of the fully retracted hexagonal cylinder 641, so that the pressing plate 643 is in the position furthest away from the hexagonal cylinder 641.

[0055] Subsequently, the compressed helical spring converts its potential energy into kinetic energy, pushing the abutment block 63 away from the hexagonal cylinder 641. This causes the abutment block 63 to pull the toothed plate 631 out of the rectangular groove of the hexagonal cylinder 641, so that the rectangular groove of the hexagonal cylinder 641 no longer limits the vertical position of the toothed plate 631. Then, the push spring pushes the toothed plate 631 downward relative to the abutment block 63 through its own elastic force, so that it contacts the upper side of the extrusion plate 643.

[0056] When the toothed plate 631 is in contact with the upper side of the extrusion plate 643, when the abutment block 63 moves away from the hexagonal cylinder 641 relative to the extrusion plate 643, the abutment block 63 causes the inclined surfaces of several teeth on the toothed plate 631 to contact the extrusion plate 643 in sequence. In conjunction with the push spring, the toothed plate 631 is pushed downward, so that the extrusion plate 643 gradually moves away from the extrusion plate 643 at the corresponding position by intermittently pushing the toothed plate 631 upward.

[0057] Similarly, when the abutment block 63 contacts the outer wheel track and is pushed by the reaction force of the outer wheel track, the abutment block 63 tends to move towards the hexagonal cylinder 641 relative to the extrusion plate 643. During this process, the abutment block 63 will drive the vertical surface of the corresponding tooth on the toothed plate 631 to contact the extrusion plate 643, thereby preventing the abutment block 63 from approaching the extrusion plate 643 at the corresponding position. This allows the abutment block 63 to move unidirectionally away from the hexagonal cylinder 641, thus allowing the abutment block 63 to gradually extend towards the center of the curved surface of the outer wheel track, ensuring alignment accuracy.

[0058] It should be noted that when the telescopic section of the one-way damping rod 635 extends downward, it moves slowly under the action of damping, while when it retracts upward, there is no damping effect, which allows the telescopic section of the one-way damping rod 635 to move smoothly upward and prevent the blocking and squeezing plate 643 from pushing the toothed plate 631 upward.

[0059] As the cylindrical frame 62 moves slowly upward, the cylindrical frame 62 drives the linkage column 613 to move upward along the wave structure of the guide groove through the claw frame 612. Guided by the wave structure of the guide groove, the linkage column 613 drives the cylindrical frame 62 to reciprocate at a small angle through the claw frame 612. The cylindrical frame 62 drives the abutment block 63 to rotate synchronously, so that the abutment block 63 rotates to the center position of the curved surface of the outer planet wheel track. Through the unidirectional movement of the abutment block 63, the abutment block 63 is precisely abutted against the center position of the curved surface of the outer planet wheel track.

[0060] See Figure 5 , Figure 6 and Figure 7 Two symmetrically arranged trigger rods 65 are slidably arranged on the abutment block 63 along the radial direction of the cylindrical frame 62. Two symmetrically arranged filling rods 651 are slidably arranged on the abutment block 63 along its thickness direction. An inclined groove is opened on the trigger rod 65. A fixing rod 652 that matches the corresponding inclined groove opening is fixedly installed on the upper side of the filling rod 651.

[0061] When the abutment block 63 abuts against the curved surface of the outer wheel, the abutment block 63 causes the trigger rod 65 to contact the curved surface of the ball track. This causes the curved surface of the ball track to push the trigger rod 65 towards the axis of the cylindrical frame 62 through the reaction force. This causes the trigger rod 65 to push the fixing rod 652 through the inclined groove on it. The fixing rod 652 pushes the filling rod 651 away from the corresponding abutment block 63, so that the filling rod 651 gradually extends to both sides of the corresponding abutment block 63.

[0062] When the abutment block 63 abuts against the center of the curved surface of the Alien Wheel fairway, the filler rod 651 extends to abut against both sides of the corresponding fairway curved surface, thereby positioning the abutment block 63 by supporting both sides of the fairway curved surface. Through this dual positioning method, the abutment block 63 is stably positioned at the center of the curved surface of the fairway.

[0063] See Figure 3 , Figure 5 , Figure 6 and Figure 7 The cleaning mechanism 7 includes a sliding plate 71 that is slidably disposed inside the abutment block 63. On the side of the sliding plate 71 away from the axis of the cylindrical frame 62, there are several scrapers 72 that slide radially along the cylindrical frame 62 at equal intervals in the vertical direction.

[0064] See Figure 5 , Figure 6 and Figure 7 A return spring is provided between the scraper 72 and the corresponding sliding plate 71, and a pushing spring is provided between the sliding plate 71 and the abutment block 63. Two symmetrical slots are provided on the sliding plate 71, and a card plate 711 for extending into the slot is fixedly installed on the filling rod 651.

[0065] See Figure 6 and Figure 7 A sludge storage groove is provided on the upper side of the scraper 72. A cover plate 721 is fixedly installed on the upper side of the scraper 72 near the axis of the cylindrical frame 62. An oil-absorbing sponge is fixedly connected to the lower side of the cover plate 721.

[0066] In the initial state, the scraper 72 extends slightly out of the abutment block 63 under the push of the return spring force, the push spring is in a compressed state, and the filling rod 651 drives the clamping plate 711 to extend into the corresponding groove of the sliding plate 71, so that the sliding plate 71 maintains the state of compressing the push spring.

[0067] When the abutment block 63 abuts against the center of the curved surface of the ball track, the abutment block 63 drives the scraper 72 to contact the center of the curved surface of the ball track through the sliding plate 71. This causes the ball track to push the scraper 72 to retract into the interior of the abutment block 63 through the reaction force, and compress the return spring. This causes the return spring to push the scraper 72 away from the axis of the cylindrical frame 62 to always abut against the curved surface of the ball track through its own elasticity.

[0068] When the filler rod 651 extends and supports both sides of the fairway surface, the filler rod 651 drives the retaining plate 711 out of the retaining groove, causing the push spring to push the sliding plate 71 upward. This causes the sliding plate 71 to drive the scraper 72 to scrape off the processing debris or oil particles adhering to the fairway surface. The scraped debris or oil particles are stored in the dirt storage groove on the scraper 72. The cover plate 721 prevents the scraped debris or oil particles from splashing out again. The oil-absorbing sponge can absorb the oil stains to ensure the cleaning effect.

[0069] It should be noted that a limit cylinder is provided on the support frame 4, and a linkage frame that is rotatably connected to the claw frame 612 for sliding up and down is provided on the lower side of the dome plate 5. Square rods for pushing the sliding plate 71 are fixedly installed at equal intervals along the circumference of the lower side of the linkage frame.

[0070] When the cylindrical frame 62 drives the linkage column 613 to move to the uppermost end of the vertical structure of the guide groove, the claw frame 612 drives the abutment block 63 to correspond one-to-one with the measuring point of the measuring tool 2 through the cylindrical frame 62, so that the abutment block 63 drives the outer star wheel to rotate to the ball track on it, which also corresponds one-to-one with the measuring point of the measuring tool 2. At the same time, the lower part of the square rod extends into the interior of the abutment block 63 and blocks the sliding plate 71, so that the upward-moving abutment block 63 compresses the push spring again.

[0071] Then, the robotic arm 3 clamps the outer star wheel, and at the same time, the telescopic section of the limit cylinder extends to move to the lower part of the claw frame 612. Then, the robotic arm 3 moves downward and drives the outer star wheel to move downward in sync. Since the extension speed of the telescopic section of the one-way damping rod 635 is much smaller than the speed at which the outer star wheel drives the abutment block 63 to descend, the one-way damping rod 635 pulls the toothed plate 631 to disengage from the pressing plate 643, so that the abutment block 63 can move towards the axis of the cylindrical frame 62.

[0072] Subsequently, the downward-moving cylindrical frame 62 drives the claw frame 612 to abut against the telescopic section of the limit cylinder, so that the cylindrical frame 62 stops moving downward. The robot arm 3 drives the outer star wheel to move downward relative to the cylindrical frame 62, so that the outer star wheel can push the abutment block 63 towards the axis of the cylindrical frame 62 through the ball track, preventing the abutment block 63 from jamming the outer star wheel. At the same time, the first spring pushes the driven block 642 downward to the initial position through its own elastic force. The driven block 642 drives the extrusion plate 643 and the abutment block 63 to return to the initial position.

[0073] After the outer wheel moves downward to the appropriate position, the rotating robot 3 drives the outer wheel to rotate half a turn. Then, the robot 3 continues to move downward, causing the outer wheel to be covered on the outside of the measuring tool 2. The measuring tool 2 measures the PCD dimension of the ball track on the outer wheel.

[0074] See Figures 1 to 9The present invention further includes the following steps when measuring the outer star wheel: First, the robot arm 3 is driven to move to the assembly line to grasp the outer star wheel by the slide rail moving assembly, so that the ball track part of the outer star wheel is arranged upward. Then, the slide rail moving assembly drives the robot arm 3 to move the outer star wheel to the lower part of the cylindrical frame 62, and relaxes the robot arm 3 so that the robot arm 3 limits the outer star wheel but does not clamp it.

[0075] In the second step, the robotic arm 3 drives the outer star wheel to move upward and cover the outside of the hexagonal cylinder 641. The outer star wheel pushes the extrusion plate 643 away from the axis of the cylindrical frame 62 through the driven block 642. At the same time, the driven block 642 drives the wedge plate 634 to move upward synchronously.

[0076] In the third step, the wedge plate 634 pushes the protruding post 633, so that the toothed plate 631 and the hexagonal cylinder 641 are no longer locked together. The helical spring pushes the abutment block 63 to move away from the hexagonal cylinder 641 by its own elasticity, and the toothed plate 631 makes the abutment block 63 move only in one direction away from the hexagonal cylinder 641.

[0077] In the fourth step, the alien wheel pushes the cylindrical frame 62 to move slowly upward, and the linkage column 613 drives the abutment block 63 to rotate back and forth at a small angle, so that the abutment block 63 rotates to the center of the curved surface of the alien wheel track. Through the unidirectional movement of the abutment block 63, the abutment block 63 is precisely abutted against the center of the curved surface of the alien wheel track.

[0078] Fifth, the fairway surface pushes the trigger rod 65 towards the axis of the cylindrical frame 62 through the reaction force, so that the trigger rod 65 pushes the filler rod 651 to extend to abut against both sides of the corresponding fairway surface. Thus, the filler rod 651 positions the abutment block 63 by supporting both sides of the fairway surface, ensuring that the abutment block 63 is stably positioned at the center of the fairway surface.

[0079] In the sixth step, the filling rod 651 drives the card plate 711 out of the card slot, so that the pushing spring pushes the scraper 72 to scrape off the processing debris or oil particles adhering to the ball track surface, and the scraped debris or oil particles are stored in the dirt storage groove on the scraper 72 to ensure the cleaning effect.

[0080] In the seventh step, the cylindrical frame 62 drives the linkage column 613 to move to the uppermost part of the vertical structure of the guide groove. The claw frame 612 drives the outer star wheel to rotate through the cylindrical frame 62 and the abutment block 63 to correspond one-to-one with the ball track on it and the measuring point of the measuring tool 2. The robot arm 3 clamps the outer star wheel and at the same time extends the telescopic section of the limit cylinder to move to the lower part of the claw frame 612.

[0081] Step 8: The downward-moving robotic arm 3 drives the outer wheel to move downward in sync, so that the outer wheel can push the abutment block 63 towards the axis of the cylindrical frame 62 through the ball track. The first spring pushes the driven block 642 downward to the initial position through its own elastic force. The driven block 642 drives the extrusion plate 643 and the abutment block 63 to return to the initial position.

[0082] In the ninth step, the rotating robot 3 drives the outer wheel to rotate half a revolution. Then, the robot 3 continues to move downwards, causing the outer wheel to be placed on the outside of the measuring tool 2. The measuring tool 2 measures the PCD dimension of the ball track on the outer wheel.

[0083] It should be noted that the measuring point on the surface of the measuring tool 2 is a pop-out steel ball. When the outer wheel cover is just placed on the outside of the measuring tool 2, the steel ball is not in contact with the ball track. When the force that makes the ball close is removed, the ball pops out and contacts the ball track. This is used to measure the PCD dimension of the ball track on the outer wheel. The measurement principle can be referred to in the Chinese utility model disclosure CN210892923U, which discloses a measuring tool for measuring the PCD dimension of the ball track of a constant velocity pitch outer wheel.

[0084] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0085] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0086] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0087] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A constant velocity universal joint (PCD) dimension measuring device, comprising a frame, on which measuring tools and a robotic arm are mounted, characterized in that, A dome plate is fixedly mounted on the frame via a support frame. The dome plate is coaxially arranged with the measuring tool. An alignment mechanism for aligning the position of the outer star wheel ball track and a cleaning mechanism for removing particles adhering to the ball track are provided on the underside of the dome plate. The alignment mechanism includes a cylindrical frame set at the bottom of the dome plate via a connecting component. Several abutment blocks that slide radially are equally spaced along the circumference of the cylindrical frame. The number of abutment blocks is equal to the number of lanes on the outer planet wheel. The side of the abutment block away from the axis of the cylindrical frame matches the curved surface of the lane. A pushing component is provided on the cylindrical frame to push the abutment blocks against the lane. The cleaning mechanism includes a sliding plate that is slidably disposed inside the abutment block, and a number of scrapers that slide radially along the cylindrical frame are equally spaced on the side of the sliding plate away from the axis of the cylindrical frame. The pushing component pushes the abutting block against the corresponding ball track. The robot arm drives the cylindrical frame to move upward through the outer wheel, so that the connecting component drives the ball track on the outer wheel to correspond with the position of the measuring tool by rotating the cylindrical frame, and scrapes away the impurity particles on the ball track by the scraper.

2. The constant velocity universal joint PCD dimension measuring device according to claim 1, characterized in that, The connecting assembly includes a fixed cylinder fixedly installed on the lower side of the dome plate, with guide grooves evenly spaced along the circumference on the outer surface of the fixed cylinder, and a claw frame fixedly installed on the upper side of the cylindrical frame and sleeved on the outside of the fixed cylinder.

3. The constant velocity universal joint PCD dimension measuring device according to claim 2, characterized in that, The lower part of the guide groove has a wave-like structure and the upper part has a vertical structure. A linkage column that is slidably connected inside the guide groove is provided on the claw frame, and a spring damping rod is provided between the fixed cylinder and the cylindrical frame.

4. The constant velocity universal joint PCD dimension measuring device according to claim 2, characterized in that, The pushing assembly includes a hexagonal cylinder fixedly installed at the axis position of the cylindrical frame. A driven block is slidably arranged up and down on the inner side of the hexagonal cylinder. An extrusion plate is slidably arranged along the radial direction of the cylindrical frame on the side of the abutment block close to the axis of the cylindrical frame. A connecting plate is hinged between the lower end of the driven block and each extrusion plate.

5. The constant velocity universal joint PCD dimension measuring device according to claim 4, characterized in that, Several helical springs are provided between the extrusion plate and the corresponding abutment block. A toothed plate is slidably provided on the upper side of the abutment block. A push spring is provided between the toothed plate and the abutment block. A notch is provided on the side of the toothed plate near the axis of the cylindrical frame.

6. The constant velocity universal joint PCD dimension measuring device according to claim 5, characterized in that, The hexagonal cylinder is slidably provided with snap plates at equal intervals along the circumference of the cylindrical frame for inserting into the notch slot. A protruding column is fixedly installed on the side of the snap plate near the axis of the cylindrical frame, and a wedge plate corresponding to the protruding column is fixedly installed on the upper side of the driven block.

7. The constant velocity universal joint PCD dimension measuring device according to claim 5, characterized in that, A one-way damping rod is slidably arranged on the upper side of the toothed plate along the radial direction of the cylindrical frame, and a rotating frame is slidably arranged on the inner side of the claw frame and rotatably connected to the lower end of the fixed cylinder. The cylinder body of the one-way damping rod is fixedly installed on the rotating frame.

8. A constant velocity joint PCD dimension measuring apparatus according to claim 1, wherein, Two symmetrically arranged trigger rods are slidably arranged on the abutment block along the radial direction of the cylindrical frame, and two symmetrically arranged filling rods are slidably arranged on the abutment block along its thickness direction. An inclined groove is opened on the trigger rod, and a fixing rod that matches the corresponding inclined groove opening is fixedly installed on the upper side of the filling rod.

9. A constant velocity joint PCD dimension measuring apparatus according to claim 8, wherein, A return spring is provided between the scraper and the corresponding sliding plate, and a pushing spring is provided between the sliding plate and the abutment block. Two symmetrical slots are provided on the sliding plate, and a card plate for extending into the slot is fixedly installed on the filling rod.

10. A constant velocity joint PCD dimension measuring apparatus according to claim 1, wherein, A sludge collection groove is provided on the upper side of the scraper, and a cover plate is fixedly installed on the upper side of the scraper near the axis of the cylindrical frame. An oil-absorbing sponge is fixedly connected to the lower side of the cover plate.

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