Tire uniformity detector

Abstract

The invention discloses a tire uniformity detection machine. The line body lifting mechanism is arranged on the equipment rack, and a conveying line is arranged on the line body lifting mechanism; a test station and a pretreatment station are respectively arranged on two sides of the equipment rack, the uniformity test bench is arranged on one side, a load loading mechanism and a lower clamp are arranged beside the uniformity test bench, an upper rim lifting mechanism is arranged on the upper side of the test station, the upper rim lifting mechanism is laterally hung on the equipment rack, a tire unloading mechanism is arranged at the bottom of the upper rim lifting mechanism, and an upper clamp is arranged on the upper rim lifting mechanism. The upper clamp and the lower clamp are matched for floating clamping, and meanwhile the horizontal moving function, the centering function, the anti-collision function, the anti-falling function and the clutch function are achieved. And a tire centering mechanism, a tire lubricating mechanism and an inflating system are arranged at the pretreatment station. According to the invention, a clamp with a higher-rigidity structure clamping relation is adopted, and the layout that the uniformity test bench is externally arranged and the upper clamp is laterally hung is adopted, so that the two-side balance of the equipment is effectively improved, the fault rate of multi-station linkage is reduced, and the operation of the equipment is more reliable.

Description

Technical Field

[0001] The present invention relates to the technical field of uniformity detection, and relates to a tire uniformity detector. Background Art

[0002] With the development and progress of the automotive industry, large transportation vehicles including trucks and small vehicles such as cars have higher requirements for ride comfort and safety. The uniformity and balance of tires directly affect phenomena such as vibrations and yaws during vehicle driving. Therefore, the requirements for tire uniformity and balance are further increasing. With the improvement of product performance requirements, higher-precision detection equipment is inevitably needed.

[0003] Currently, there is no mature online tire uniformity detector in China. The uniformity detectors currently used by tire manufacturing enterprises still rely on imported equipment, and the imported equipment currently in use has the following problems:

[0004] 1. The accuracy of the fixture depends on high-precision machining, and the manufacturing cost is high;

[0005] 2. The core test stations of the equipment are surrounded by frames, and the maintainability is poor. Maintenance personnel need to drill into narrow spaces for maintenance work, which is relatively dangerous;

[0006] 3. The imported equipment consists of multiple independent stations, with poor integration and large space occupation;

[0007] 4. Due to the independence between stations, the equipment migration process is cumbersome;

[0008] 5. Using hydraulic cylinders to resist the tire inflation reaction force causes the equipment to be prone to hydraulic oil leakage;

[0009] 6. The hydraulic system needs to be in a working state all the time, with high energy consumption. Summary of the Invention

[0010] In order to solve the problems existing in the background art, the present invention provides a tire uniformity detector.

[0011] The present invention is a tire uniformity detector with a new architecture, aiming to fill the domestic equipment gap. At the same time, higher-rigidity fixtures, innovative equipment architectures, and highly integrated equipment layouts are adopted to solve the defects of current imported equipment.

[0012] The technical solution adopted by the present invention is:

[0013] It includes an equipment frame, a conveyor line, a test station, and a pretreatment station; a line lifting mechanism is installed in the middle of the equipment frame, and a conveyor line for conveying test tires is installed on the line lifting mechanism.

[0014] On one side of the equipment frame, a test station is arranged, and a tire unloading mechanism, an upper rim lifting mechanism, a uniformity test bench, an upper fixture and a lower fixture are arranged at the test station; a uniformity test bench is arranged on the lower side of the test station. The uniformity test bench is installed on one side of the equipment frame. A main shaft is provided inside the uniformity test bench. A lower fixture for cooperatively connecting the lower end of the test tire is installed on the uniformity test bench. An upper rim lifting mechanism is arranged on the upper side of the test station. The upper rim lifting mechanism is laterally hung and installed on the equipment frame on the same side as the uniformity test bench. A tire unloading mechanism is arranged at the bottom of the upper rim lifting mechanism. An upper fixture for cooperatively connecting the upper end of the test tire is installed on the upper rim lifting mechanism. The upper fixture and the lower fixture are cooperatively connected to form a tire test cooperative fixture. The tire test cooperative fixture is used for floating clamping and simultaneously realizes functions of horizontal movement, centering, anti-collision, anti-falling and clutch.

[0015] On the other side of the bottom of the equipment frame, a pre-treatment station is arranged, and a tire centering mechanism, a tire lubrication mechanism and an inflation system are arranged at the pre-treatment station; the tire lubrication mechanism is arranged above the conveyor line. A tire centering mechanism is arranged on the side of the tire lubrication mechanism. An inflation system for inflating the test tire is installed on the equipment frame above the pre-treatment station.

[0016] The load loading mechanism includes a load loading frame, load wheels and force sensors; the load loading frame is installed on one side of the uniformity test bench and is slidably connected to the uniformity test bench to move closer to or away from it through high-rigidity linear sliding rails and lead screws. The lead screw is driven by a driving motor to drive the load loading frame to slide back and forth on the uniformity test bench. Load wheels are installed on the load loading frame. The load wheels are used to contact the test tire on the uniformity test bench. The load wheels are connected to the load loading frame through one force sensor each on the upper and lower sides.

[0017] The force sensors are two-dimensional force sensors that can simultaneously measure forces in the horizontal and vertical directions. Bearings are installed inside the load wheels and can rotate freely.

[0018] The uniformity test bench is fixed on the large bottom plate of the equipment frame. The lower fixture is installed on the front side of the test bench and is driven to rotate by a motor also fixed on the side of the test bench. The load loading frame is installed on the uniformity test bench and is connected to the uniformity test bench through high-rigidity linear sliding rails and lead screws. The lead screw can be driven by a driving motor to drive the load loading frame to slide back and forth on the uniformity test bench. The load wheels are connected to the load loading frame through one force sensor each on the upper and lower sides. The force sensors are two-dimensional force sensors that can simultaneously measure forces in the horizontal and vertical directions. Bearings are installed inside the load wheels and can rotate freely. The upper rim lifting mechanism is installed on the upper side of the equipment frame through guide rails and can be driven by the motor of the upper rim lifting mechanism to move up and down, so as to drive the upper fixture to run to the specified coordinates.

[0019] The wire body lifting mechanism includes a lifting component, a distance adjustment component, and a conveyor line mounting seat; the lifting component is installed on the equipment frame, the upper part of the lifting component is installed with the distance adjustment component, the conveyor line mounting seat is installed above the distance adjustment component, and two conveyor lines are installed above the conveyor line mounting seat; the lifting component drives the distance adjustment component, the conveyor line mounting seat, and the conveyor lines to move up and down together, and the distance adjustment component drives the two conveyor lines on the conveyor line mounting seat to move horizontally closer to or away from each other.

[0020] A camera is installed on the equipment frame directly above the tire lubrication mechanism, and tire centering mechanisms are installed on the equipment frames on both sides above the tire lubrication mechanism; the tire centering mechanism includes a cylinder, a long connecting rod, a short connecting rod, a bearing seat, and two centering modules; the two centering modules are respectively installed on the equipment frames on both sides above the tire lubrication mechanism, and each centering module includes two gear arm components. Each gear arm component is mainly composed of an arm and a gear fixedly connected to one end of the arm. The gears of the two gear arm components in the same centering module are meshed; the cylinder is installed on the equipment frame, the piston rod of the cylinder is connected to the gear of one gear arm component in one side centering module, and an L-shaped bearing seat is hingedly installed on the gear of one gear arm component in the other side centering module. The gear of the other gear arm component in one side centering module is synchronously rotatably connected to the bearing seat through a long connecting rod, and the bearing seat is synchronously rotatably connected to the gear of the other gear arm component in the other side centering module through a short connecting rod.

[0021] The tire unloading mechanism includes a tire unloading pressing plate, a tire unloading claw width adjustment component, tire unloading claws, and a lifting cylinder. The lifting cylinder is fixed on the upper rim lifting mechanism, the piston rod of the lifting cylinder is fixedly connected to the tire unloading pressing plate, the tire unloading claw width adjustment component and the two tire unloading claws are both installed on the tire unloading pressing plate, and the tire unloading claw width adjustment component is respectively connected to the two tire unloading claws.

[0022] The upper rim lifting mechanism is an equipment mechanism with a motor and is driven by the motor to move up and down along the gravity direction.

[0023] The lower fixture includes a lower rim coaxially and fixedly sleeved outside the main shaft. During the uniformity test, the test tire is clamped between the upper rim and the lower rim of the upper fixture.

[0024] The upper fixture includes an upper fixture mounting plate, a positioning and adjusting plate, a collision buffer plate, a horizontal adjusting seat, a center adjusting seat, a collision buffer spring, a fixture unlocking cylinder, a parallel gripper, an upper fixture clutch ring, an upper fixture core shaft, an upper rim, a fixture lock, an unlocking press head, a locking button, and a transmission shaft; the upper fixture mounting plate is fixedly installed on the upper rim lifting mechanism, and the upper fixture mounting plate, the positioning and adjusting plate, and the collision buffer plate are arranged at intervals from bottom to top, and at the same time, horizontal adjusting seats, center adjusting seats, and collision buffer springs for horizontal adjustment, centering, and anti-falling are provided between them:

[0025] The bottom surface of the positioning adjustment plate is installed on the upper fixture mounting plate through the horizontal adjustment seats at each corner in a relatively horizontally movable manner. The horizontal attitude of the positioning adjustment plate relative to the upper fixture mounting plate is adjusted through the horizontal adjustment seats, so that the positioning adjustment plate is horizontally parallel to the lower fixture and the test tire; at each corner of the top surface of the positioning adjustment plate, a center adjustment seat and a bolt are installed. The horizontal movement of the positioning adjustment plate relative to the upper fixture mounting plate is adjusted through the center adjustment seat, so that the center of the positioning adjustment plate is aligned with the lower fixture and the test tire below.

[0026] The collision buffer plate is elastically installed on the positioning adjustment plate through the collision buffer springs at each corner. The floating interval distance of the collision buffer plate relative to the upper fixture mounting plate is adjusted through the collision buffer springs when the upper rim lifting mechanism works.

[0027] A parallel gripper is fixedly installed at the lower end of the collision buffer plate. The lower end of the parallel gripper passes through the upper fixture mounting plate downward and then an upper fixture clutch ring is installed. The upper fixture clutch ring is used to clamp the upper fixture mandrel. At the same time, an upper fixture anti-falling ring is fixedly installed at the lower end of the parallel gripper. The top end of the upper fixture mandrel is arranged on the step formed by the anti-falling ring to be restricted from moving downward; the support ring is installed on the lower side of the upper fixture mounting plate, and a bearing is used for circumferential clearance fit between the support ring and the upper fixture mandrel.

[0028] The fixture unlocking cylinder is fixedly installed on the upper surface of the collision buffer plate. The lower end of the piston rod of the fixture unlocking cylinder passes through the collision buffer plate downward and then is fixedly connected to the upper end of the unlocking press head in the central through hole inside the parallel gripper. The unlocking press head is driven by the fixture unlocking cylinder to move up and down in the central through hole inside the parallel gripper; a central through hole is opened in the upper fixture mandrel, and a transmission shaft is installed in the central through hole. The upper rim is coaxially and fixedly sleeved outside the upper fixture mandrel. The upper end of the transmission shaft extends out of the central through hole of the upper fixture mandrel and then a locking button is fixedly installed. The locking button is used for pressure contact with the unlocking press head; the middle part of the transmission shaft is connected to the central through hole of the upper fixture mandrel through a lock buckle extending spring, and the lower end of the transmission shaft passes through the central through hole of the upper fixture mandrel and then a fixture lock buckle is installed; the lower ends of the upper fixture mandrel and the transmission shaft pass through the lower rim of the lower fixture and extend into the central through hole of the main shaft and are fixedly connected through the lock buckle extending spring and the fixture lock buckle for clamping.

[0029] An unpenetrated groove is opened on the top surface of the upper fixture mounting plate, and the horizontal adjustment seat is embedded in the groove. The horizontal adjustment seat is mainly composed of two ring blocks that are rotationally connected through threads. The lower ring block is embedded in the groove, and the top surface of the upper ring block is connected to the bottom surface of the positioning adjustment plate.

[0030] An unperforated blind hole is provided on the top surface of the positioning and adjusting plate, and a center adjusting seat is embedded in the blind hole. A convex platform is provided at the lower end of the center adjusting seat, and the convex platform is rotatably embedded in the blind hole only, so that the center adjusting seat can rotate in the blind hole around its own central axis. A waist-shaped groove penetrating up and down is provided in the middle of the center adjusting seat. The bolt passes downward through the waist-shaped groove and then sequentially passes through the positioning and adjusting plate, the horizontal adjusting seat, and the upper fixture mounting plate and is threadedly fixed to the upper rim lifting mechanism above.

[0031] The collision buffer spring is sleeved outside the spring bolt and is located above the collision buffer plate. The spring bolt passes downward through the collision buffer spring and then movably passes through the collision buffer plate and is threadedly connected to the threaded hole in the positioning and adjusting plate; a collision detection sensor is provided between the collision buffer plate and the positioning and adjusting plate, and the collision detection sensor detects the distance between the collision buffer plate and the positioning and adjusting plate in real time; when the distance detected by the collision detection sensor in real time is greater than the preset distance threshold, the collision detection sensor generates a signal to control the motor in the upper rim lifting mechanism to stop working, that is, to drive the upper rim lifting mechanism to stop descending.

[0032] A parallel gripper is fixedly installed at the lower end of the collision buffer plate. The parallel gripper passes downward through the upper fixture mounting plate. The edge at the lower end of the parallel gripper is connected and installed with an upper fixture clutch ring composed of a plurality of clutch blocks. The parallel gripper is used to drive the plurality of clutch blocks to move closer to or away from the center; the upper fixture clutch ring is used to clamp the upper end of the upper fixture mandrel; at the same time, an upper fixture anti-falling ring composed of a plurality of anti-falling blocks is provided in the middle at the lower end of the parallel gripper. A larger-diameter outer flange is provided at the upper end of the upper fixture mandrel. A horizontal flange is provided at the lower end of each anti-falling block, and the horizontal flange extends toward the center and supports and connects the lower step surface of the outer flange at the top end of the upper fixture mandrel, so that the downward movement of the upper fixture mandrel is limited.

[0033] The tire test fitting fixture formed by the cooperation of the above-mentioned upper fixture and lower fixture in the present invention simultaneously has functions such as horizontal adjustment, centering, anti-collision, anti-falling, and clutch, and can also perform controllable and adjustable cooperation.

[0034] A latch extending spring is sleeved on the top end of the transmission shaft connected to the bottom end of the locking button. The central through hole of the upper fixture mandrel is a stepped hole that is larger at the top and smaller at the bottom. The upper and lower ends of the latch extending spring are elastically connected to the stepped surfaces between the locking button and the transmission shaft and the stepped surface of the stepped hole of the upper fixture mandrel respectively. At the same time, the lower ends of the upper fixture mandrel and the transmission shaft are used to pass through the lower rim of the lower fixture and extend into the central through hole of the main shaft. The inner wall of the central through hole of the main shaft is provided with a tooth groove structure. The lower end of the transmission shaft is set as a tapered pituitary that is smaller at the top and larger at the bottom. The bottom of the central through hole of the upper fixture mandrel is opened as a tapered cavity that conforms to the shape of the pituitary. The tapered pituitary is embedded in the tapered cavity. A horizontally penetrating radial channel is opened on the inner wall of the central through hole of the upper fixture mandrel at the tapered cavity. A fixture latch is installed in the radial channel. The fixture latch can move horizontally in the radial channel. The inner end of the fixture latch is set as a conical surface for mating contact with the tapered pituitary. The outer end of the fixture latch is provided with a tooth groove structure for mating with the sawtooth structure on the inner wall of the central through hole of the main shaft.

[0035] And the tooth groove structure on the inner wall of the central through hole of the main shaft is set as a multi-level tooth groove structure with different heights along the up and down axial directions. By adjusting the different axial positions of the locking button and the transmission shaft extending into the central through hole of the main shaft, the fixture latch is engaged in the tooth groove structures at different heights, thereby adjusting the distance between the upper fixture and the lower fixture, and thus realizing different clamping forces and clamping of test tires with different sizes.

[0036] The beneficial effects of the present invention are:

[0037] 1. Adopt a fixture with higher rigidity: The fixture has high rigidity and high strength, which can make the test results more repetitive and accurate.

[0038] 2. Innovative equipment architecture: The equipment of the present invention adopts an external test bench and a layout with the upper fixture (15) hanging on the side, which effectively improves the maintainability and safety of the equipment.

[0039] 3. High-integration equipment layout: The present invention adopts an innovative structure with high integration, integrating the test bench, lubrication station, centering station, etc. together, effectively reducing the floor area of the equipment, reducing the failure rate of multi-station linkage, reducing production costs, making the equipment operation more reliable, and facilitating the handling and transportation of the equipment.

[0040] 4. Adopt a mechanical lock to replace the hydraulic system, avoiding a series of disadvantages brought by the hydraulic system, such as oil leakage, environmental pollution, difficult maintenance, high energy consumption, high cost, etc.

[0041] 5. Adopt an upper support ring structure. Compared with the lateral force on the hydraulic rod, the equipment has stronger rigidity and better test stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a three-dimensional view of the equipment.

[0043] Figure 2 This is the front view of the device.

[0044] Figure 3 This is the perspective view of the uniformity test bench.

[0045] Figure 4 This is the detailed structure diagram of the lifting part of the upper fixture.

[0046] Figure 5 This is the detailed drawing of the upper fixture.

[0047] Figure 6 This is Figure 6 the C-C sectional view of.

[0048] Figure 7 This is the detailed drawing of the upper and lower fixtures when they are closed.

[0049] Figure 8 This is the diagram of the line lifting mechanism.

[0050] Figure 9 This is the top view of the tire centering mechanism.

[0051] Figure 10 This is the diagram of the tire unloading mechanism.

[0052] Figure 11 This is one of the state diagrams of the cooperation relationship between the upper and lower fixtures of the present invention.

[0053] Figure 12 This is the second state diagram of the cooperation relationship between the upper and lower fixtures of the present invention.

[0054] Figure 13 This is Figure 12 the partial enlarged view of.

[0055] In the figure: uniformity test bench (1), upper rim lifting mechanism (2), equipment frame (3), line lifting mechanism (4), tire centering mechanism (5), electric control cabinet (6), tire lubrication mechanism (7), inflation system (8), tire unloading mechanism (9), conveyor line (10), test tire (11), upper fixture (12), lower fixture (13);

[0056] Load loading frame (14), load wheel (15), force sensor (16);

[0057] Lifting component (401), distance adjusting component (402), conveyor line mounting seat (403);

[0058] Gear (501), cylinder (502), long connecting rod (503), short connecting rod (504), bearing seat (505), holding arm (506);

[0059] Tire unloading pressure plate (901), tire unloading claw width adjusting component (902), tire unloading claw (903), lifting cylinder (904);

[0060] Upper fixture mounting plate (1201), positioning and adjusting plate (1202), collision buffer plate (1203), horizontal adjusting base (1204), central adjusting base (1205), collision buffer spring (1206), fixture unlocking cylinder (1207), parallel gripper (1208), upper fixture clutch ring (1209), upper fixture anti-falling ring (1210), upper fixture mandrel (1211), upper rim (1212), fixture lock (1213), unlocking punch (1214), locking button (1215), lock extension spring (1216), transmission shaft (1217), support ring (15161218);

[0061] Lower rim (1301). Detailed implementation mode

[0062] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0063] The present invention describes a tire uniformity tester with a new structure, which includes an equipment frame 3, a conveying line 10, a test station and a pre-treatment station; more specifically, as Figure 1 and Figure 2 shown, it includes a uniformity test bench 1, an upper rim lifting mechanism 2, an equipment frame 3, a line lifting mechanism 4, a tire centering mechanism 5, a tire lubricating mechanism 7, an inflation system 8, a tire unloading mechanism 9, a conveying line 10, an upper fixture 12 and a lower fixture 13.

[0064] As Figure 1 and Figure 2 shown, the equipment frame 3 is fixed on the ground, the line lifting mechanism 4 is installed in the middle of the equipment frame 3, and the conveying line 10 for conveying the test tire 11 is installed on the line lifting mechanism 4, and the conveying line 10 is installed through the line lifting mechanism 4;

[0065] As Figure 1 and Figure 2 shown, a test station is arranged on one side of the equipment frame 3 and the conveying line 10, and a tire unloading mechanism 9, an upper rim lifting mechanism 2, a uniformity test bench 1, an upper fixture 12 and a lower fixture 13 are arranged at the test station; a uniformity test bench 1 is arranged on the lower side of the test station, and the uniformity test bench 1 is installed on one side of the equipment frame 3 and arranged upward through the conveying line 10. A main shaft 102 is provided in the uniformity test bench 1, a load loading mechanism is arranged beside the uniformity test bench 1, and a lower fixture 13 for cooperatively connecting the lower end of the test tire 11 is installed on the uniformity test bench 1. An upper rim lifting mechanism 2 is arranged on the upper side of the test station, and the upper rim lifting mechanism 2 is side-mounted on the equipment frame 3 on the same side as the uniformity test bench 1, as Figure 4As shown in the figure, a tire unloading mechanism 9 for unloading the test tire 11 from the uniformity test bench 1 is provided at the bottom of the upper rim lifting mechanism 2. An upper clamp 12 for cooperatively connecting to the upper end of the test tire 11 is installed on the bottom of the upper rim lifting mechanism 2. The upper clamp 12 and the lower clamp 13 are cooperatively connected to form a tire test cooperation clamp. The tire test cooperation clamp is used for floating clamping, and at the same time realizes functions such as horizontal movement, centering, anti-collision, anti-falling, and clutch;

[0066] On the other side bottom of the equipment frame 3 and the conveyor line 10, a pre-treatment station is arranged. A tire centering mechanism 5, a tire lubricating mechanism 7, and an inflation system 8 are provided at the pre-treatment station; the tire lubricating mechanism 7 is arranged above the conveyor line 10, and tire centering mechanisms 5 are arranged on both sides of the tire lubricating mechanism 7. The tire centering mechanism 5 and the tire lubricating mechanism 7 are also fixedly installed on the equipment frame 3. An inflation system 8 for inflating the test tire 11 is installed on the equipment frame 3 above the pre-treatment station, and the inflation system 8 is communicated with the inner cavity of the test tire 11.

[0067] The equipment frame 3 serves as the basic carrier of the equipment and is composed of a large bottom plate and a main frame. The rest of the components are installed on the equipment frame 3. The conveyor line 10 passes through the center of the main frame. While the main frame serves as the installation basis for the components, the frame structure provides high-strength support for the movement of the side-mounted movable components, enhancing the structural stability of the equipment. The layout of the large bottom plate improves the integration of the equipment, avoids the difficulties in transportation of the split architecture, and at the same time avoids the problem of accuracy decline caused by transportation or equipment handling.

[0068] At the same time, since the side-mounted side of the equipment frame 3 is subjected to a large overturning force, additional counterweights need to be provided on the other side to prevent the equipment frame 3 from tipping over. In the present invention, the tire centering mechanism 5, the tire lubricating mechanism 7, and the inflation system 8 of the pre-treatment station are all installed on the other side of the upper rim lifting mechanism 2 and the upper clamp 12 on the side-mounted of the equipment frame 3. While installing and arranging to connect with the conveyor line 10, the problem of easy overturning force on the side-mounted of the balance tester is also solved, without the need for additional configuration, reducing the cost and improving the compactness of the equipment.

[0069] The load loading mechanism includes a load loading frame 14, a load wheel 15, and a force sensor 16; the load loading frame 14 is installed on one side of the uniformity test bench 1 and is slidably connected to the uniformity test bench 1 relatively closer or farther away through a high-rigidity linear slide rail and a lead screw. The lead screw is driven by a driving motor to drive the load loading frame 14 to slide back and forth on the uniformity test bench 1. A load wheel 15 is installed on the load loading frame 14. The load wheel 15 is used to contact the test tire 11 on the uniformity test bench 1. The load wheel 15 is connected to the load loading frame 14 through a force sensor 16 at each of the upper and lower positions.

[0070] The force sensor 16 is a two-dimensional force sensor that can measure forces in both horizontal and vertical directions simultaneously. A bearing is installed inside the load wheel 15 to enable free rotation.

[0071] The uniformity test bench 1 is fixed to the large base plate of the equipment frame 3. The lower fixture 13 is installed on the front side of the test bench and is driven to rotate by a motor also fixed to the side of the test bench. The load loading frame 14 is installed on the uniformity test bench 1 and is connected to the uniformity test bench 1 through high-rigidity linear sliding rails and lead screws. The lead screw can be driven by a driving motor to drive the load loading frame 14 to slide back and forth on the uniformity test bench 1. The load wheel 15 is connected to the load loading frame 14 through a force sensor 16 at each of the upper and lower positions. The force sensor 16 is a two-dimensional force sensor that can measure forces in both horizontal and vertical directions simultaneously. A bearing is installed inside the load wheel 15 to enable free rotation. The upper rim lifting mechanism 2 is installed on the upper side of the equipment frame 3 through a guide rail and can move up and down by the motor drive of the upper rim lifting mechanism 2, used to drive the upper fixture 12 to run to the specified coordinates.

[0072] As Figure 8 shown, the wire body lifting mechanism 4 includes a lifting component 401, a distance adjustment component 402, and a conveyor line mounting seat 403; the lifting component 401 is installed on the equipment frame 3 at the lower part, the distance adjustment component 402 is installed on the upper part of the lifting component 401, the conveyor line mounting seat 403 is installed above the distance adjustment component 402, and two conveyor lines 10 are installed above the conveyor line mounting seat 403; the lifting component 401 drives the distance adjustment component 402, the conveyor line mounting seat 403, and the conveyor line 10 to move up and down together, and the distance adjustment component 402 drives the two conveyor lines 10 on the conveyor line mounting seat 403 to move horizontally closer to or away from each other.

[0073] The wire body lifting mechanism 4 is fixed to the lower side of the equipment frame 3 and can move up and down by the lifting motor drive mechanism of the wire body lifting mechanism 4. Among them, the lifting component 401 is used to lift and lower the conveyor line 10, and the distance adjustment component 402 is used to adjust the distance between the conveyor lines 10 to adapt to different tire specifications. This structure can avoid problems such as bell mouths and side deviations caused by asynchronous adjustment during the width adjustment of the long wire body, avoid problems such as the tire not being transported in place due to the width adjustment of the wire body, and further avoid problems such as mold closing collisions caused by the tire not being transported in place. Of course, the distance adjustment component can be manually adjusted using a handwheel or automatically adjusted using a program control such as a motor.

[0074] Two conveyor lines 10 are installed on the lead screw sliding rail assembly. The conveyor line 10 is driven by a wire body drive motor installed thereon to rotate the conveyor belt. The conveying direction of the conveyor line can be switched by separately controlling the rotation direction of the motor, or the tire on the conveyor line can be driven to rotate in place by changing the rotation direction of one of the motors. Compared with the conveyor line driven by a single motor, this implementation method provides a very large degree of freedom for the realization of the equipment functions.

[0075] As Figure 9 shown, the tire centering mechanism 5 is installed on the inner crossbeam of the main frame, and the tire centering mechanism 5 is driven by a cylinder 502 and a connecting rod.

[0076] A camera is installed on the equipment frame 3 directly above the tire lubrication mechanism 7, and the tire centering mechanism 5 is installed on the equipment frame 3 on both sides above the tire lubrication mechanism 7

[0077] More specifically, the tire centering mechanism 5 includes a cylinder 502, a long connecting rod 503, a short connecting rod 504, a bearing seat 505 and two centering modules; the two centering modules are respectively installed on the equipment frame 3 on both sides above the tire lubrication mechanism 7, and each centering module includes two gear arm components. Each gear arm component is mainly fixedly connected by an arm 506 and a gear 501 at one end of the arm 506. The arm 506 and the gear 501 at one end of the arm 506 can be hingedly installed on the equipment frame 3, and the gears 501 of the two gear arm components in the same centering module mesh;

[0078] The cylinder 502 is installed on one side of the equipment frame 3, and the piston rod of the cylinder 502 is connected to the gear 501 of a gear arm component in one centering module on one side. Specifically, the piston rod of the cylinder 502 is hinged to one end of a connecting rod, and the other end of the connecting rod is fixedly connected to the gear 501.

[0079] An L-shaped bearing seat 505 is hingedly installed on the gear 501 of a gear arm component in the other centering module on the other side. The gear 501 of the other gear arm component in one centering module on one side is synchronously rotatably connected to the bearing seat 505 through a long connecting rod 503. Specifically, the gear 501 is fixedly connected to one end of a connecting rod, the other end of the connecting rod is hinged to one end of the long connecting rod 503, the other end of the long connecting rod 503 is hinged to one end of the L-shaped bearing seat 505, and the middle of the L-shaped bearing seat 505 itself is hinged to the gear 501.

[0080] The bearing seat 505 is synchronously rotatably connected to the gear 501 of the other gear arm component in the other centering module on the other side through a short connecting rod 504. Specifically, the other end of the L-shaped bearing seat 505 is hinged to one end of the short connecting rod 504, the other end of the short connecting rod 504 is hinged to one end of a connecting rod, and the other end of the connecting rod is fixedly connected to the gear 501.

[0081] The center of the bearing block 505 is hinged and installed on the lower gear 501. This node can transmit the torque of the long connecting rod 503 to the short connecting rod 504, while preventing the torque of the long connecting rod 503 from being transmitted to the gear below the bearing block 505. The movement of the centering mechanism is driven by the telescopic movement of the piston rod of the air cylinder 502. Two sets of such structures are arranged on both sides respectively. The combination of two-stage connecting rods can avoid the problem that the connecting rod directly passes through the center of the equipment and interferes with the camera installed at the center of the equipment. The driving mechanism drives four clamping arms to open and close to complete the centering function of the tire.

[0082] Specifically, when the air cylinder 502 retracts, it drives the gear 501 and the clamping arm 506 of a gear clamping arm assembly in one side centering module to rotate towards the center. Due to the meshing relationship between the two gear clamping arm assemblies in this side centering module, the other gear clamping arm assembly is also driven to rotate towards the center. Due to the action of the long connecting rod 503, the bearing block 505 in the other side centering module rotates synchronously. Since the bearing block 505 is hinged to the gear 501 for installation, the gear 501 of a gear clamping arm assembly in the other side centering module where the bearing block 505 is hinged does not rotate, but drives the gear 501 of the other gear clamping arm assembly in the other side centering module connected to the other end of the bearing block 505 to rotate towards the center. Due to the meshing relationship between the two gear clamping arm assemblies in the other side centering module, the other gear clamping arm assembly is also driven to rotate towards the center. Thus, all four gear clamping arm assemblies rotate towards the center, and then the test tire 11 is clamped to achieve positioning and centering.

[0083] On the contrary, when the air cylinder 502 extends, it drives all four gear clamping arm assemblies to rotate away from the center, and then the test tire 11 is loosened and clamped.

[0084] As Figure 1 shown, the tire unloading mechanism 9 is installed on the upper rim lifting mechanism 2. The tire unloading mechanism 9 is used to remove the test tire 11 from the upper and lower jigs after the test of the test tire 11.

[0085] As Figure 10As shown in the figure, the tire unloading mechanism 9 includes a tire unloading pressing plate 901, a tire unloading claw width adjustment component 902, tire unloading claws 903, and a lifting cylinder 904. The lifting cylinder 904 is fixed on the upper rim lifting mechanism 2. The piston rod of the lifting cylinder 904 is fixedly connected to the tire unloading pressing plate 901, and the tire unloading pressing plate 901 moves up and down along with the piston rod of the lifting cylinder 904. The tire unloading claw width adjustment component 902 and two tire unloading claws 903 are both installed on the tire unloading pressing plate 901. The tire unloading claw width adjustment component 902 is respectively connected to the two tire unloading claws 903. The rotation and opening / closing angles of the two tire unloading claws 903 are adjusted through the tire unloading claw width adjustment component 902. The lifting cylinder 904 drives the overall up and down movement of the tire unloading claws 903 and the tire unloading claw width adjustment component 902, and the tire unloading claw width adjustment component 902 drives the separation movement of the two tire unloading claws 903, so as to adapt to tire rims of different sizes.

[0086] When the lifting cylinder 904 retracts, the tire unloading claws 903 disengage from the tire. When the lifting cylinder 904 extends, the tire unloading claws 903 press down on the tire and cause the tire to disengage from the upper fixture.

[0087] The two tire unloading claws 903 are used to toggle the inner edge of the bead of the test tire 11 and unload the test tire 11 clamped between the upper fixture 12 and the lower fixture 13. The tire unloading claw width adjustment component 902 can drive the two tire unloading claws 903 to move by using a lead screw-nut sliding pair.

[0088] The tire lubrication mechanism 7 is installed on the middle cross beam of the main frame of the equipment rack 3. This mechanism can drive the brush to move back and forth and up and down to lubricate the inner edge of the bead of the test tire 11. Specifically implemented, the tire lubrication mechanism 7 is provided with a ball table, and brushes for scraping are provided around the upper side of the ball table.

[0089] The inflation system 8 is installed on the top small beam of the main frame of the equipment rack 3. It is composed of an air storage tank and a pneumatic control circuit, and can control the output air pressure and flow rate, and is used for the inflation function during the test of the test tire 11.

[0090] As Figure 1 shown, the specific implementation also includes an electric control cabinet 6. The electric control cabinet 6 is installed on the side of the equipment rack 3 to provide power and control for the equipment. The electric control cabinet 6 is respectively connected to the electrical components in the uniformity test bench 1, the upper rim lifting mechanism 2, the line lifting mechanism 4, the tire centering mechanism 5, the inflation system 8, the tire unloading mechanism 9, and the conveyor line 10.

[0091] The upper rim lifting mechanism 2 is an equipment mechanism with a motor and is driven by the motor to move up and down along the direction of gravity; in specific implementation, a gear-rack transmission pair or the like can be used.

[0092] The upper rim lifting mechanism 2 is installed on the upper side of the equipment rack 3 through a guide rail, and can move up and down through the drive of the motor of the upper rim lifting mechanism 2, driving the upper fixture 12 to the specified coordinates.

[0093] The lower fixture 13 includes a lower rim 1301 coaxially and fixedly sleeved outside the main shaft 102 and a lock ring mechanism for locking the upper fixture. During the uniformity test, the test tire 11 is clamped between the upper rim 1212 of the upper fixture 12 and the lower rim 1301.

[0094] As Figure 5 and Figure 7 shown, the upper fixture 12 is installed on the upper rim lifting mechanism 2 and moves up and down driven by the upper rim lifting mechanism 2. The upper fixture mounting plate 1201 serves as the basis of the upper fixture assembly and is fixed to the upper rim lifting mechanism 2 to complete the installation of the upper fixture assembly.

[0095] More specifically, the upper fixture 12 includes an upper fixture mounting plate 1201, a positioning and adjusting plate 1202, a collision buffer plate 1203, a horizontal adjusting seat 1204, a center adjusting seat 1205, a collision buffer spring 1206, a fixture unlocking cylinder 1207, a parallel gripper 1208, an upper fixture clutch ring 1209, an upper fixture anti-falling ring 1210, an upper fixture mandrel 1211, an upper rim 1212, a fixture lock 1213, an unlocking punch 1214, a locking button 1215, and a transmission shaft 1217.

[0096] The upper fixture mounting plate 1201 is fixedly installed on the upper rim lifting mechanism 2. The upper fixture mounting plate 1201, the positioning and adjusting plate 1202, and the collision buffer plate 1203 are arranged at intervals from bottom to top, and a horizontal adjusting seat 1204, a center adjusting seat 1205, and a collision buffer spring 1206 for horizontal adjustment, centering, and anti-falling are provided between them:

[0097] The bottom surface of the positioning and adjusting plate 1202 is installed on the upper fixture mounting plate 1201 through the horizontal adjusting seats 1204 at each corner and can be horizontally moved relative to it. The horizontal attitude of the positioning and adjusting plate 1202 relative to the upper fixture mounting plate 1201 is adjusted through the horizontal adjusting seats 1204, so that the positioning and adjusting plate 1202 is horizontally parallel to the lower fixture 13 and the test tire 11.

[0098] Center adjusting seats 1205 and bolts are installed at each corner of the top surface of the positioning and adjusting plate 1202. The horizontal movement of the positioning and adjusting plate 1202 relative to the upper fixture mounting plate 1201 is adjusted through the center adjusting seats 1205, so that the cylinders, the fixture unlocking cylinder 1207, the upper fixture mandrel 1211, etc. at the center of the positioning and adjusting plate 1202 are aligned and centered with the lower fixture 13 and the test tire 11 below.

[0099] The collision buffer plate 1203 is reversely and elastically mounted on the positioning and adjusting plate 1202 through the collision buffer springs 1206 at each corner. When the upper rim lifting mechanism 2 works, the floating interval distance of the collision buffer plate 1203 relative to the upper fixture mounting plate 1201 is adjusted through the collision buffer springs 1206.

[0100] The positioning and adjusting plate 1202 is mounted on the upper fixture mounting plate 1201, and three triangular horizontal adjusting seats 1204 are mounted between the two. The height of the horizontal adjusting seat 1204 is changed through the thread, so as to adjust the levelness of the positioning and adjusting plate 1202.

[0101] More specifically, an unpenetrated groove is formed on the top surface of the corner of the upper fixture mounting plate 1201, and the block-shaped horizontal adjusting seat 1204 is embedded in the groove. The horizontal adjusting seat 1204 is mainly composed of two upper and lower ring blocks that are rotationally connected through the thread. The upper and lower ring blocks are connected through the thread, so that the upper and lower ring blocks rotate to drive the adjustment of the up-and-down axial distance between the upper and lower ring blocks; the lower ring block is embedded in the groove, and the top surface of the upper ring block is connected to the bottom surface of the corner of the positioning and adjusting plate 1202.

[0102] The upper and lower ring blocks are both provided with clamping grooves. The clamping groove of the lower ring block is used to cooperate with the convex block in the groove for connection to form a non-rotatable embedding, and the clamping groove of the upper ring block is used to be driven by an external crescent wrench to rotate. By driving the upper ring block to rotate, the up-and-down axial distance between the upper and lower ring blocks is adjusted, and then the distance between the top surface of the upper fixture mounting plate 1201 and the bottom surface of the positioning and adjusting plate 1202 is adjusted. The horizontal adjusting seats 1204 between the upper fixture mounting plate 1201 and the three corners of the positioning and adjusting plate 1202 are all adjusted to adjust the horizontal attitude of the positioning and adjusting plate 1202 relative to the upper fixture mounting plate 1201.

[0103] Since the upper fixture mounting plate 1201 is fixed on the upper rim lifting mechanism 2, the upper rim lifting mechanism 2 may not be horizontal but inclined. In this way, the horizontal adjusting seat 1204 structure can adjust the positioning and adjusting plate 1202 to maintain a horizontal attitude when the upper fixture mounting plate 1201 is inclined.

[0104] Above the positioning adjustment plate 1202, at a position corresponding to the horizontal adjustment seat 1204, a center adjustment seat 1205 is installed. More specifically, on the top surface of the corner of the positioning adjustment plate 1202, an unperforated circular blind hole is provided. In the blind hole, the center adjustment seat 1205 of the block is embedded. At the lower end of the center adjustment seat 1205, a circular boss is provided, and the boss is only rotatably embedded into the circular blind hole, so that the center adjustment seat 1205 can rotate around its own central axis in the blind hole. A waist-shaped groove penetrating up and down is provided in the middle of the center adjustment seat 1205. The bolt passes downward through the waist-shaped groove and then sequentially passes through the positioning adjustment plate 1202, the horizontal adjustment seat 1204, and the upper fixture mounting plate 1201, and is then threadedly fixed to the upper rim lifting mechanism 2.

[0105] When the bolt is loosened, the center adjustment seat 1205 is rotated so that the length direction of the waist-shaped groove is along the required horizontal movement direction of the positioning adjustment plate 1202, driving the positioning adjustment plate 1202 to move horizontally along the length direction of the waist-shaped groove together with the center adjustment seat 1205. The bolt moves in the waist-shaped groove, thereby driving the horizontal movement of the positioning adjustment plate 1202 relative to the upper fixture mounting plate 1201.

[0106] Through the cooperation of the center adjustment seats 1205 at the three corners of the positioning adjustment plate 1202, the horizontal movement direction and distance of the entire center adjustment seat 1205 relative to the upper fixture mounting plate 1201 are driven.

[0107] When the locking screw of the center adjustment seat 1205 is loosened, the positioning adjustment plate 1202 can move freely on the plane composed of the three horizontal adjustment seats 1204 at the three corners. When the locking screw of the center adjustment seat 1205 is tightened, the position of the positioning adjustment plate 1202 is locked and cannot move. Through the above mechanism, the upper fixture has the functions of horizontal adjustment and center adjustment. It ensures that the upper and lower fixtures are concentric and coaxial, and avoids faults caused by the offset of the upper and lower fixtures.

[0108] The three center adjustment seats 1205 can determine a unique adjustment direction. This structure not only avoids the random offset problem caused by adjusting the center by opening a large hole, but also has the function of adjusting the center in any direction.

[0109] The collision buffer spring 1206 is sleeved outside the spring bolt and is located above the collision buffer plate 1203. The spring bolt passes downward through the collision buffer spring 1206 and then movably passes through the collision buffer plate 1203 and is threadedly connected to the threaded hole at the corner of the positioning adjustment plate 1202.

[0110] A collision detection sensor is arranged between the collision buffer plate 1203 and the positioning adjustment plate 1202 to detect whether the upper and lower clamps collide during the mold closing process. The collision detection sensor detects the distance between the collision buffer plate 1203 and the positioning adjustment plate 1202 in real time. When the distance detected by the collision detection sensor in real time is greater than the preset distance threshold, the collision detection sensor generates a signal, and the controller in the electric control cabinet 6 controls the motor in the upper rim lifting mechanism 2 to stop working, that is, to drive the upper rim lifting mechanism 2 to stop descending and move, thereby playing an anti-collision function.

[0111] The collision buffer plate 1203 is installed on the positioning adjustment plate 1202, and the two are connected by a guide column of a spring bolt. The horizontal position is relatively fixed, and the vertical direction can be freely moved. The collision buffer spring 1206 is installed on the guide column to limit the vertical movement of the collision buffer plate 1203. However, when the upper clamp 12 collides with the lower clamp 12, at the initial stage of the collision, the collision buffer plate 1203 is moved upward by the collision force to overcome the collision buffer spring 1206. When the collision buffer plate 1203 is separated from the positioning adjustment plate 1202, the collision detection sensor is triggered, and an alarm and a collision post-processing procedure are issued, so that the equipment is released from the collision state and the equipment is prevented from being damaged.

[0112] A parallel air gripper 1208 is fixedly installed at the lower end of the collision buffer plate 1203. The lower end of the parallel air gripper 1208 passes downward through the upper fixture mounting plate 1201 and is then installed with an upper fixture clutch ring 1209. The upper fixture clutch ring 1209 is used to clamp the upper fixture mandrel 1211. At the same time, an upper fixture anti-fall ring 1210 is fixedly installed at the lower end of the parallel air gripper 1208. The top end of the upper fixture mandrel 1211 is arranged on the step formed by the anti-fall ring 1210 and is restricted from moving downward.

[0113] A parallel air gripper 1208 is fixedly installed at the lower end of the collision buffer plate 1203. The parallel air gripper 1208 is arranged downward through the upper fixture mounting plate 1201. The edge of the lower end of the parallel air gripper 1208 is connected and installed with an upper fixture clutch ring 1209 composed of multiple clutch blocks. The parallel air gripper 1208 may be equipped with a built-in motor to drive the multiple clutch blocks to move toward or away from the center; the upper end of the upper fixture clutch ring 1209 is fixedly connected to the lower end of the parallel air gripper 1208, and the upper fixture clutch ring 1209 is used to clamp the upper end of the upper fixture core shaft 1211; the multiple clutch blocks of the upper fixture clutch ring 1209 move together to clamp the upper end of the upper fixture core shaft 1211, so that the upper fixture core shaft 1211, the parallel air gripper 1208 and the collision buffer plate 1203 rotate synchronously.

[0114] At the middle of the lower end of the parallel gripper 1208, there is an upper fixture anti-fall ring 1210 composed of multiple anti-fall blocks, and the relative positions of the multiple anti-fall blocks are always fixed. The top surface of the upper fixture anti-fall ring 1210 is fixed to the bottom surface of the parallel gripper 1208. The upper end of the upper fixture core shaft 1211 is provided with a larger-diameter outer flange, and each anti-fall block is provided with a horizontal flange at the lower end. The horizontal flange extends towards the center and supports the lower step surface of the outer flange connecting the top end of the upper fixture core shaft 1211, so that the downward movement of the upper fixture core shaft 1211 is limited, playing the function of preventing falling. That is, the inner diameter of the bottom ends of the multiple anti-fall blocks is smaller than the outer diameter of the outer flange at the top end of the upper fixture core shaft 1211.

[0115] In specific implementation, as Figure 6 shown, the multiple clutch blocks of the upper fixture clutch ring 1209 and the multiple anti-fall blocks of the upper fixture anti-fall ring 1210 are arranged at intervals and alternately in the circumferential direction. Usually, three of each are set, and the three clutch blocks and the three anti-fall blocks are arranged at intervals and alternately in the circumferential direction, staggered, with non-interfering positions, but at the same time, the upper fixture core shaft 1211 can be clamped and supported to prevent falling.

[0116] The support ring 1218 is installed on the lower side of the upper fixture mounting plate 1201, and the support ring 1218 and the upper fixture core shaft 1211 are sleeved and connected with a bearing clearance fit in the circumferential direction.

[0117] When, during the equipment test, the tested tire is under the pressure of the load wheel, the support ring 1218 and the test bench provide two force-bearing points at the same time. The advantage of this design is that the force-bearing state of the tested tire is changed from a cantilever beam with single-end force-bearing to a simply supported beam with two-end force-bearing. At the same time, since the bearing does not limit the axial displacement, the fixture will not have problems of deformation and jamming; better still, since the support ring 1218 is integrated in the upper fixture and can move with the upper fixture, the upper support point of the tire always has a relatively short force arm with the tire. This force-bearing state can maximize the equipment rigidity during the uniformity test, avoid the change of the force-bearing arm due to the change of the tire width, and then change the rigidity of the equipment. Compared with the hydraulic drive structure, the advantages of a short force arm and stronger equipment rigidity are obvious.

[0118] When the upper fixture clutch ring 1209 is in a state of closing and holding tightly to each other, it firmly holds the upper fixture core shaft 1211, making the core shaft unable to move. When the upper fixture clutch ring 1209 is in a state of moving away from each other and opening, the upper fixture core shaft 1211 can move freely. The upper fixture anti-fall ring 1210 is installed below the parallel gripper 1208, installed out of alignment with the upper fixture clutch ring 1209, surrounding the upper fixture core shaft 1211, and having a certain clearance in the circumferential direction with the core shaft. The core shaft can rotate or move upward, but cannot fall.

[0119] The fixture unlocking cylinder 1207 is installed on the collision buffer plate 1203 and can drive the unlocking pressure head 1214 to move up and down. The parallel gripper 1208 is installed below the collision buffer plate 1203 and drives the upper fixture clutch ring 1209 to open and close.

[0120] The fixture unlocking cylinder 1207 is fixedly installed on the upper surface of the collision buffer plate 1203. The lower end of the piston rod of the fixture unlocking cylinder 1207 passes downward through the collision buffer plate 1203 and is then fixedly connected to the upper end of the unlocking pressure head 1214 in the central through hole inside the parallel gripper 1208. The unlocking pressure head 1214 is actually a vertical shaft, and the fixture unlocking cylinder 1207 drives the unlocking pressure head 1214 to move up and down in the central through hole inside the parallel gripper 1208. A central through hole is provided in the upper fixture mandrel 1211, and a transmission shaft 1217 is installed in the central through hole. The upper rim 1212 is coaxially and fixedly sleeved outside the upper fixture mandrel 1211. After the upper end of the transmission shaft 1217 extends out of the central through hole of the upper fixture mandrel 1211, a locking button 1215 is fixedly installed, and the locking button 1215 is used to make pressure contact with the bottom surface of the unlocking pressure head 1214. The middle part of the transmission shaft 1217 is connected to the central through hole of the upper fixture mandrel 1211 through a latch spring 1216, and the lower end of the transmission shaft 1217 passes through the central through hole of the upper fixture mandrel 1211 and then a fixture latch 1213 is installed.

[0121] The lower ends of the upper fixture mandrel 1211 and the transmission shaft 1217 pass through the lower rim 1301 of the lower fixture 13 and extend into the central through hole of the main shaft 102, and are fixedly connected through the cooperation of the latch spring 1216 and the fixture latch 1213, realizing the coaxial fixation of the upper fixture mandrel 1211 with the main shaft 102 and the lower fixture 13, and further realizing the coaxial fixed rotation between the upper fixture 12, the lower fixture 13, and the main shaft 102.

[0122] In a specific implementation, a latch spring 1216 is sleeved outside the top end of the transmission shaft 1217 connected to the bottom end of the locking button 1215. The middle part of the central through hole of the upper fixture mandrel 1211 is a stepped hole that is larger at the top and smaller at the bottom. The diameter of the locking button 1215 is larger than the diameter of the transmission shaft 1217. The upper and lower ends of the latch spring 1216 are elastically connected to the stepped surfaces between the locking button 1215 and the transmission shaft 1217 and the stepped surface of the stepped hole of the upper fixture mandrel 1211 respectively.

[0123] At the same time, the upper fixture mandrel 1211 and the lower end of the transmission shaft 1217 are used together to pass through the lower rim 1301 of the lower fixture 13 and extend into the central through-hole of the main shaft 102. The inner wall of the central through-hole of the main shaft 102 is provided with a tooth groove structure. The lower end of the transmission shaft 1217 is arranged as a tapered pituitary with a smaller upper part and a larger lower part. The bottom of the central through-hole of the upper fixture mandrel 1211 is opened as a tapered cavity that fits the shape of the pituitary. The tapered pituitary is embedded in the tapered cavity. A horizontally penetrating radial channel is opened on the inner wall of the central through-hole of the upper fixture mandrel 1211 at the tapered cavity. A fixture lock 1213 is installed in the radial channel. The fixture lock 1213 can move horizontally in the radial channel. The lock and the transmission shaft are in a T-shaped groove fit and can perform extension and retraction actions, enabling the fixture lock 1213 to be horizontally reset in the radial channel. The inner end of the fixture lock 1213 is arranged as a partial conical surface for mating contact with the conical surface of the tapered pituitary. The outer end of the fixture lock 1213 is provided with a tooth groove structure for mating with the serrated structure on the inner wall of the central through-hole of the main shaft 102. The top surface of the tapered pituitary and the top surface of the tapered inner cavity are connected by conical surface contact.

[0124] As Figure 11 shown, when the upper fixture mandrel 1211 is clamped and restricted from rotating and moving axially up and down by the upper fixture clutch ring 1209, the piston rod of the fixture unlocking cylinder 1207 moves downward, driving the unlocking press head 1214 to also move downward, pushing the locking button 1215 and the transmission shaft 1217 to move downward relative to the upper fixture mandrel 1211 against the acting force of the lock-out spring 1216, causing a gap to be generated between the top surface of the tapered pituitary of the transmission shaft 1217 and the top surface of the tapered inner cavity at the bottom surface of the upper fixture mandrel 1211. The fixture lock 1213 moves radially inward in the radial channel and closely contacts and connects with the surface of the tapered pituitary of the transmission shaft 1217. Furthermore, the outer end of the fixture lock 1213 is disengaged from the serrated structure of the central through-hole of the main shaft 102. As Figure 13 shown, thereby enabling the upper fixture mandrel 1211 to move axially freely up and down relative to the main shaft 102, achieving the coaxial disengagement of the upper fixture mandrel 1211 from the main shaft 102 and the lower fixture 13, and further realizing the non-connection of the upper fixture 12, the lower fixture 13, and the main shaft 102 in coaxiality, enabling the upper fixture 12 to move freely up and down.

[0125] As Figure 12As shown, the piston rod of the fixture unlocking cylinder 1207 moves upward, driving the unlocking press head 1214 to move upward as well. The locking button 1215 and the transmission shaft 1217 move upward relative to the upper fixture core shaft 1211 under the action of the locking spring 1216, causing the top surface of the conical pituitary of the transmission shaft 1217 to be in close contact with the top surface of the conical inner cavity at the bottom of the upper fixture core shaft 1211. This pushes the fixture locking buckle 1213 to move radially outward in the radial channel, and further causes the outer end of the fixture locking buckle 1213 to engage with the sharp-angle serrated structure of the central through hole of the main shaft 102, thereby realizing the coaxial fixed connection of the upper fixture 12 and its upper fixture core shaft 1211 with the main shaft 102 and the lower fixture 13. When the main shaft 102 and the lower fixture 13 rotate, they drive the upper fixture 12, its upper fixture core shaft 1211, and the transmission shaft 1217 to rotate synchronously.

[0126] Moreover, the tooth groove structure on the inner wall of the central through hole of the main shaft 102 is set as a multi-level tooth groove structure with different heights along the up and down axial directions. By adjusting the different axial positions of the locking button 1215 and the transmission shaft 1217 extending into the central through hole of the main shaft 102, the fixture locking buckle 1213 is engaged in tooth groove structures at different heights, thereby adjusting the distance between the upper rim 1212 of the upper fixture 12 and the lower rim 1301 of the lower fixture 13, and thus realizing different clamping forces and clamping of test tires 11 with different sizes.

[0127] This enables the cooperation structure between the upper fixture 12 and the lower fixture 13 of the present invention to not only have an adjustable coaxial fixed connection, but also cleverly form an adjustable axial height, simultaneously realizing the clamping of the test tire 11 and the adjustability of the clamping force.

[0128] The fixture locking buckle 1213 is installed on the core shaft, and a locking button 1215 is designed at the top of the core shaft: when the locking button 1215 is pushed and pressed by the unlocking press head 1214, the fixture locking buckle 1213 retracts into the core shaft; when the locking button 1215 is not pushed by the unlocking press head 1214 and pops up upward, the fixture locking buckle 1213 extends out of the core shaft and cooperates with the lower fixture 13 to form a mold closing state.

[0129] The upper rim 1212 is installed on the core shaft 1211, and the installation interface of the upper rim 1212 adopts a special taper fit, which can conveniently replace the rim according to production needs and ensure that the fixture accuracy meets the production requirements. Whether the rim and the tire are precisely matched during the test is a key factor in the accuracy of the test results.

[0130] The lower fixture 13 is installed at the center of the uniformity test bench 1 and is driven to rotate by the main shaft 102 inside the uniformity test bench 1. The lower fixture 13 is equipped with a lower rim 1301.

[0131] During the mold closing process of the equipment, the upper rim lifting mechanism 2 drives the upper fixture 12 to move downward, and the upper fixture mandrel 1211 and the transmission shaft 1217 are inserted into the center through hole of the lower fixture 12 and the main shaft 102:

[0132] If the upper and lower clamps are misaligned or blocked by obstacles during the descent process, a collision alarm will be triggered, and timely risk avoidance measures such as stopping the machine, terminating the mold, and withdrawing the machine will be taken to avoid major accidents such as equipment damage and casualties.

[0133] If the state is normal, it moves to the specified coordinates, the clamp unlocking cylinder 1207 retracts, driving the unlocking pressure head 1214 to retract, and the locking button 1215 pops out under the action of the spring, driving the clamp lock buckle 1213 to extend and hook the inner groove of the lower clamp;

[0134] The lower fixture centering mechanism holds the upper fixture mandrel 1211 tightly, and the upper fixture clutch ring 1209 is released, completing the mold closing action. At this time, the upper and lower fixtures can rotate synchronously to perform testing work; the mold opening is the reverse step. The clutch ring is used as the limit for rotation. The part below the clutch ring rotates with the lower fixture after the mold is closed, and the part above the clutch ring remains fixed.

[0135] The upper clamp has higher safety and stability.

[0136] The operation process of the present invention is as follows:

[0137] 1. The test tire 11 to be tested is transported from the production line to the front end of the equipment, and is moved by the conveyor line 10 to the platform above the tire lubrication mechanism 7. Then, the conveyor line 10 is driven down by the line lifting mechanism 4 to drop the test tire 11 onto the tire lubrication mechanism 7;

[0138] 2. The tire centering mechanism 5 performs the centering action to position the test tire 11 at the center of the tire lubrication mechanism 7, and the line between the center of the tire lubrication mechanism 7 and the center of the inspection station is parallel to the conveying direction of the conveyor line 10;

[0139] 3. The brush at the tire lubrication station in the tire lubrication mechanism 7 is driven by the cylinder to come close to the inner edge of the sub-mouth of the test tire 11, and then the test tire 11 is clamped by the tire centering mechanism 5, and then the test tire 11 is driven to rotate on the lubrication platform, and the lubricating liquid on the brush is evenly applied to the inner edge of the sub-mouth of the test tire 11 for lubrication;

[0140] 5. After lubrication is completed, the line lifting mechanism 4 drives the conveyor line 10 to lift the test tire 11 from the tire lubrication mechanism 7, and then the conveyor line 10 moves the test tire 11 along the conveying direction to the test station on the uniformity test bench 1 at the rear end;

[0141] 6. Then, the line lifting mechanism 4 descends to place the test tire 11 on the lower rim 1301 and separates the conveyor line 10 from the test tire 11.

[0142] 7. Then, the upper rim lifting mechanism 2 drives the upper fixture 12 to descend to a specified position, bringing the upper rim 1212 close to the test tire 11.

[0143] 8. The upper rim lifting mechanism 2 drives the upper fixture 12 to continue descending until the upper rim 1212 contacts and presses down on the test tire 11, causing the upper fixture 12 and the lower fixture 13 to perform a mold closing and locking action, clamping the test tire 11 between the upper and lower rims 1212 and 1301.

[0144] 9. The inflation system 8 inflates the test tire 11 according to the programmed air pressure, causing the inner bead edge of the test tire 11 to tightly combine with the upper and lower rims 1212 and 1301, reaching the internal seal test state.

[0145] 10. The test bench drives the test tire 11 to rotate. At the same time, the load loading frame 14 drives the load wheel 15 close to the test tire 11, applies a set load force to squeeze the test tire 11, and the test tire 11 drives the load wheel 15 to rotate.

[0146] 11. The force sensors 16 on both sides of the load wheel 15 collect the reaction forces of the test tire 11 on the load wheel 15 in the horizontal and vertical directions, and analyze the signals to calculate the data related to the uniformity of the test tire 11.

[0147] 12. After completing the data collection, the load loading frame 14 drives the load wheel 15 to return to the origin.

[0148] 13. After completing the uniformity test, the test system rotates the test tire 11 to a specified angle to prepare for the next work station, and the inflation system 8 evacuates the air pressure inside the test tire 11.

[0149] 14. The upper rim lifting mechanism 2 drives the upper fixture 12 to rise, unlocking between the upper fixture 12 and the lower fixture 13, i.e., unlocking the upper and lower fixtures. The upper rim lifting mechanism 2 drives the upper fixture 12 to move up to a specified position, and at the same time, the tire unloading mechanism 9 operates to separate the test tire 11 from the upper rim 1212 of the upper fixture 12.

[0150] 15. The line lifting mechanism 4 drives the conveyor line 10 to rise to lift the test tire 11 off the fixture 13, send the test tire 11 out of the equipment, and at the same time transport another test tire 11 that has completed the lubrication process to the uniformity test bench 1 for testing.

[0151] The above specific embodiments are used to explain the present invention rather than limit the present invention. Any modifications and changes made to the present invention within the spirit and scope of the claims of the present invention fall within the protection scope of the present invention.

[0152] The above is only a preferred embodiment of the present invention. Therefore, all equivalent changes or modifications made according to the structure, features and principles described in the scope of the present invention patent application are included in the scope of the present invention patent application.

Claims

1. A tire uniformity testing machine, characterized in that: It includes an equipment frame (3), a conveying line (10), a testing station, and a pre-treatment station; a line lifting mechanism (4) is installed in the middle of the equipment frame (3), and a conveying line (10) for conveying a test tire (11) is installed on the line lifting mechanism (4); A testing station is arranged on one side of the equipment frame (3). At the testing station, a tire unloading mechanism (9), an upper rim lifting mechanism (2), a uniformity testing table (1), an upper fixture (12), and a lower fixture (13) are provided; a uniformity testing table (1) is arranged on the lower side of the testing station. The uniformity testing table (1) is installed on one side of the equipment frame (3). A main shaft (102) is provided inside the uniformity testing table (1). A lower fixture (13) for cooperatively connecting the lower end of the test tire (11) is installed on the uniformity testing table (1). An upper rim lifting mechanism (2) is arranged on the upper side of the testing station. The upper rim lifting mechanism (2) is side-mounted on the equipment frame (3) on the same side as the uniformity testing table (1). A tire unloading mechanism (9) is arranged at the bottom of the upper rim lifting mechanism (2). An upper fixture (12) for cooperatively connecting the upper end of the test tire (11) is installed on the upper rim lifting mechanism (2). The upper fixture (12) and the lower fixture (13) are cooperatively connected to form a tire testing cooperation fixture. The tire testing cooperation fixture is used for floating clamping and simultaneously realizes functions of horizontal movement, centering, anti-collision, anti-falling, and clutch; A pre-treatment station is arranged at the bottom on the other side of the equipment frame (3). At the pre-treatment station, a tire centering mechanism (5), a tire lubrication mechanism (7), and an inflation system (8) are provided; the tire lubrication mechanism (7) is arranged above the conveying line (10). A tire centering mechanism (5) is arranged on the side of the tire lubrication mechanism (7). An inflation system (8) for inflating the test tire (11) is installed on the equipment frame (3) above the pre-treatment station.

2. The tire uniformity testing machine according to claim 1, characterized in that: The load loading mechanism includes a load loading frame (14), a load wheel (15), and a force sensor (16); the load loading frame (14) is installed on one side of the uniformity testing table (1) and is slidably connected to the uniformity testing table (1) to move closer to or away from it through a linear slide rail and a lead screw. A load wheel (15) is installed on the load loading frame (14). The load wheel (15) is used to contact the test tire (11) on the uniformity testing table (1). The load wheel (15) is connected to the load loading frame (14) through a force sensor (16) at each of the upper and lower positions.

3. The tire uniformity testing machine according to claim 1, characterized in that: The wire body lifting mechanism (4) includes a lifting component (401), a distance adjustment component (402), and a conveyor line mounting base (403); the lifting component (401) is installed on the equipment frame (3), the upper part of the lifting component (401) is installed with the distance adjustment component (402), the conveyor line mounting base (403) is installed above the distance adjustment component (402), and two conveyor lines (10) are installed above the conveyor line mounting base (403); the lifting component (401) drives the distance adjustment component (402), the conveyor line mounting base (403), and the conveyor line (10) to move up and down together, and the distance adjustment component (402) drives the two conveyor lines (10) on the conveyor line mounting base (403) to move horizontally closer to or away from each other.

4. The tire uniformity testing machine according to claim 1, characterized in that: A camera is installed on the equipment frame (3) directly above the tire lubrication mechanism (7), and tire centering mechanisms (5) are installed on the equipment frame (3) on both sides above the tire lubrication mechanism (7); The tire centering mechanism (5) includes a cylinder (502), a long connecting rod (503), a short connecting rod (504), a bearing seat (505), and two centering modules; the two centering modules are respectively installed on the equipment frame (3) on both sides above the tire lubrication mechanism (7), and each centering module includes two gear arm components. Each gear arm component is mainly composed of a connecting arm (506) and a gear (501) fixedly connected to one end of the connecting arm (506). The gears (501) of the two gear arm components in the same centering module are meshed; the cylinder (502) is installed on the equipment frame (3), the piston rod of the cylinder (502) is connected to the gear (501) of a gear arm component in one of the centering modules on one side, and an L-shaped bearing seat (505) is hingedly installed on the gear (501) of a gear arm component in the other centering module on the other side. The gear (501) of the other gear arm component in one of the centering modules on one side is synchronously rotatably connected to the bearing seat (505) through the long connecting rod (503), and the bearing seat (505) is synchronously rotatably connected to the gear (501) of the other gear arm component in the other centering module on the other side through the short connecting rod (504).

5. The tire uniformity testing machine according to claim 1, characterized in that: The tire unloading mechanism (9) includes a tire unloading pressing plate (901), a tire unloading claw width adjustment component (902), tire unloading claws (903), and a lifting cylinder (904). The lifting cylinder (904) is fixed on the upper rim lifting mechanism (2), the piston rod of the lifting cylinder (904) is fixedly connected to the tire unloading pressing plate (901), the tire unloading claw width adjustment component (902) and the two tire unloading claws (903) are both installed on the tire unloading pressing plate (901), and the tire unloading claw width adjustment component (902) is respectively connected to the two tire unloading claws (903).

6. The tire uniformity testing machine according to claim 1, characterized in that: The upper rim lifting mechanism (2) is an equipment mechanism with a motor and is controlled by the motor to drive it to move up and down along the direction of gravity; The lower fixture (13) includes a lower rim (1301) coaxially and fixedly sleeved outside the main shaft (102). During the uniformity test, the test tire (11) is clamped between the upper rim (1212) of the upper fixture (12) and the lower rim (1301).

7. A tire uniformity detector according to claim 1 or 6, characterized in that: The upper fixture (12) includes an upper fixture mounting plate (1201), a positioning and adjusting plate (1202), a collision buffer plate (1203), a horizontal adjusting seat (1204), a center adjusting seat (1205), a collision buffer spring (1206), a fixture unlocking cylinder (1207), a parallel gripper (1208), an upper fixture clutch ring (1209), an upper fixture mandrel (1211), an upper rim (1212), a fixture lock (1213), an unlocking punch (1214), a locking button (1215), and a transmission shaft (1217); the upper fixture mounting plate (1201) is fixedly mounted on the upper rim lifting mechanism (2). The upper fixture mounting plate (1201), the positioning and adjusting plate (1202), and the collision buffer plate (1203) are arranged at intervals from bottom to top, and horizontal adjusting seats (1204), center adjusting seats (1205), and collision buffer springs (1206) for horizontal adjustment, centering, and anti-falling are provided between them: The bottom surface of the positioning and adjusting plate (1202) is relatively horizontally movably mounted on the upper fixture mounting plate (1201) through the horizontal adjusting seats (1204) at each corner. The horizontal attitude of the positioning and adjusting plate (1202) relative to the upper fixture mounting plate (1201) is adjusted through the horizontal adjusting seats (1204) so that the positioning and adjusting plate (1202) is horizontally parallel to the lower fixture (13) and the test tire (11); center adjusting seats (1205) and bolts are installed at each corner of the top surface of the positioning and adjusting plate (1202). The horizontal movement of the positioning and adjusting plate (1202) relative to the upper fixture mounting plate (1201) is adjusted through the center adjusting seats (1205) so that the center of the positioning and adjusting plate (1202) is centered with the lower fixture (13) and the test tire (11) below. The collision buffer plate (1203) is elastically mounted on the positioning and adjusting plate (1202) through the collision buffer springs (1206) at each corner. The floating interval distance of the collision buffer plate (1203) relative to the upper fixture mounting plate (1201) is adjusted through the collision buffer springs (1206) when the upper rim lifting mechanism (2) works. A parallel gripper (1208) is fixedly installed at the lower end of the collision buffer plate (1203). The lower end of the parallel gripper (1208) passes downward through the upper fixture mounting plate (1201) and then an upper fixture clutch ring (1209) is installed. The upper fixture clutch ring (1209) is used to clamp the upper fixture mandrel (1211). At the same time, an upper fixture anti-fall ring (1210) is fixedly installed at the lower end of the parallel gripper (1208). The top end of the upper fixture mandrel (1211) is arranged above the step formed by the anti-fall ring (1210) to be restricted from moving downward; The support ring (1218) is installed on the lower side of the upper fixture mounting plate (1201). A circumferential clearance fit connection is sleeved between the support ring (1218) and the upper fixture mandrel (1211) with a bearing. The fixture unlocking cylinder (1207) is fixedly installed on the upper surface of the collision buffer plate (1203). The lower end of the piston rod of the fixture unlocking cylinder (1207) passes downward through the collision buffer plate (1203) and then is fixedly connected to the upper end of the unlocking press head (1214) in the central through hole inside the parallel gripper (1208). The unlocking press head (1214) is driven by the fixture unlocking cylinder (1207) to move up and down in the central through hole inside the parallel gripper (1208); A central through hole is opened in the upper fixture mandrel (1211), and a transmission shaft (1217) is installed in the central through hole. The upper rim (1212) is coaxially and fixedly sleeved outside the upper fixture mandrel (1211). The upper end of the transmission shaft (1217) extends out of the central through hole of the upper fixture mandrel (1211) and then a locking button (1215) is fixedly installed. The locking button (1215) is used for pressure contact cooperation with the unlocking press head (1214); The middle part of the transmission shaft (1217) is connected to the central through hole of the upper fixture mandrel (1211) through a lock buckle extension spring (1216). The lower end of the transmission shaft (1217) passes through the central through hole of the upper fixture mandrel (1211) and then a fixture lock buckle (1213) is installed; The lower ends of the upper fixture mandrel (1211) and the transmission shaft (1217) pass through the lower rim (1301) of the lower fixture (13) and extend into the central through hole of the main shaft (102), and are clamped and fixedly connected through the lock buckle extension spring (1216) and the fixture lock buckle (1213).

8. The tire uniformity testing machine according to claim 7, wherein: An unpenetrated groove is opened on the top surface of the upper fixture mounting plate (1201), and a horizontal adjustment seat (1204) is embedded in the groove. The horizontal adjustment seat (1204) is mainly composed of two ring blocks that are rotationally connected by threads. The lower ring block is embedded in the groove, and the top surface of the upper ring block is connected to the bottom surface of the positioning adjustment plate (1202); A blind hole that does not penetrate is provided on the top surface of the positioning and adjusting plate (1202), and a center adjusting seat (1205) is embedded in the blind hole. A boss is provided at the lower end of the center adjusting seat (1205), and the boss is rotatably embedded in the blind hole only, so that the center adjusting seat (1205) can rotate in the blind hole around its own central axis. A waist-shaped groove that penetrates up and down is provided in the middle of the center adjusting seat (1205). After the bolt passes through the waist-shaped groove downward, it then passes through the positioning and adjusting plate (1202), the horizontal adjusting seat (1204), and the upper fixture mounting plate (1201) in sequence and is threadedly fixed to the upper rim lifting mechanism (2). The collision buffer spring (1206) is sleeved outside the spring bolt and is located above the collision buffer plate (1203). After the spring bolt passes through the collision buffer spring (1206) downward, it then movably passes through the collision buffer plate (1203) and is threadedly connected to a threaded hole in the positioning and adjusting plate (1202). A collision detection sensor is provided between the collision buffer plate (1203) and the positioning and adjusting plate (1202). The collision detection sensor detects the distance between the collision buffer plate (1203) and the positioning and adjusting plate (1202) in real time. When the distance detected by the collision detection sensor in real time is greater than a preset distance threshold, the collision detection sensor generates a signal to control the motor in the upper rim lifting mechanism (2) to stop working, that is, to drive the upper rim lifting mechanism (2) to stop descending.

9. The tire uniformity testing machine according to claim 7, wherein: A parallel gripper (1208) is fixedly installed at the lower end of the collision buffer plate (1203). The parallel gripper (1208) is arranged to pass through the upper fixture mounting plate (1201) downward. The edge at the lower end of the parallel gripper (1208) is connected and installed to an upper fixture clutch ring (1209) composed of a plurality of clutch blocks. The parallel gripper (1208) is used to drive the plurality of clutch blocks to move closer to or away from the center. The upper fixture clutch ring (1209) is used to clamp the upper end of the upper fixture mandrel (1211). At the same time, an upper fixture anti-falling ring (1210) composed of a plurality of anti-falling blocks is provided in the middle at the lower end of the parallel gripper (1208). The upper end of the upper fixture mandrel (1211) is provided with a larger-diameter outer flange. A horizontal flange is provided at the lower end of each anti-falling block, and the horizontal flange extends toward the center and supports and connects to the lower step surface of the outer flange at the top end of the upper fixture mandrel (1211), so that the downward movement of the upper fixture mandrel (1211) is limited.

10. The tire uniformity testing machine according to claim 7, wherein: A lock catch extension spring (1216) is sleeved outside the top end of the transmission shaft (1217) connected to the bottom end of the lock button (1215). The central through hole of the upper fixture mandrel (1211) is a stepped hole that is larger at the top and smaller at the bottom. The upper and lower ends of the lock catch extension spring (1216) are elastically connected to the step surface between the lock button (1215) and the transmission shaft (1217) and the step surface of the stepped hole of the upper fixture mandrel (1211) respectively. At the same time, the lower ends of the upper fixture mandrel (1211) and the transmission shaft (1217) are used together to pass through the lower rim (1301) of the lower fixture (13) and extend into the central through-hole of the main shaft (102). The inner wall of the central through-hole of the main shaft (102) is provided with a tooth groove structure. The lower end of the transmission shaft (1217) is set as a conical pituitary with a smaller upper part and a larger lower part. The bottom of the central through-hole of the upper fixture mandrel (1211) is opened as a conical cavity that fits the shape of the pituitary. The conical pituitary is embedded in the conical cavity. A horizontally penetrating radial channel is opened on the inner wall of the central through-hole of the upper fixture mandrel (1211) at the conical cavity. A fixture lock (1213) is installed in the radial channel. The fixture lock (1213) can move horizontally in the radial channel. The inner end of the fixture lock (1213) is set as a conical surface for cooperating and contacting with the conical pituitary. The outer end of the fixture lock (1213) is provided with a tooth groove structure for cooperating with the sawtooth structure on the inner wall of the central through-hole of the main shaft (102). Moreover, the tooth groove structure on the inner wall of the central through-hole of the main shaft (102) is set as a multi-level tooth groove structure with different heights along the up and down axial direction. By adjusting the different axial positions of the locking button (1215) and the transmission shaft (1217) extending into the central through-hole of the main shaft (102), the fixture lock (1213) is engaged in the tooth groove structures at different heights, thereby adjusting the distance between the upper fixture (12) and the lower fixture (13), and thus realizing different clamping forces and clamping of test tires (11) with different sizes.

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